drivers/input/touchscreen/atmel_mxt_ts.c

   1 /*
   2  * Atmel maXTouch Touchscreen driver
   3  *
   4  * Copyright (C) 2010 Samsung Electronics Co.Ltd
   5  * Copyright (C) 2011-2014 Atmel Corporation
   6  * Copyright (C) 2012 Google, Inc.
   7  * Copyright (C) 2016 Zodiac Inflight Innovations
   8  *
   9  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  *
  16  */
  17
  18 #include <linux/acpi.h>
  19 #include <linux/dmi.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/completion.h>
  23 #include <linux/delay.h>
  24 #include <linux/firmware.h>
  25 #include <linux/i2c.h>
  26 #include <linux/platform_data/atmel_mxt_ts.h>
  27 #include <linux/input/mt.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/of.h>
  30 #include <linux/slab.h>
  31 #include <linux/gpio/consumer.h>
  32 #include <asm/unaligned.h>
  33 #include <media/v4l2-device.h>
  34 #include <media/v4l2-ioctl.h>
  35 #include <media/videobuf2-v4l2.h>
  36 #include <media/videobuf2-vmalloc.h>
  37
  38 /* Firmware files */
  39 #define MXT_FW_NAME             "maxtouch.fw"
  40 #define MXT_CFG_NAME            "maxtouch.cfg"
  41 #define MXT_CFG_MAGIC           "OBP_RAW V1"
  42
  43 /* Registers */
  44 #define MXT_OBJECT_START        0x07
  45 #define MXT_OBJECT_SIZE         6
  46 #define MXT_INFO_CHECKSUM_SIZE  3
  47 #define MXT_MAX_BLOCK_WRITE     256
  48
  49 /* Object types */
  50 #define MXT_DEBUG_DIAGNOSTIC_T37        37
  51 #define MXT_GEN_MESSAGE_T5              5
  52 #define MXT_GEN_COMMAND_T6              6
  53 #define MXT_GEN_POWER_T7                7
  54 #define MXT_GEN_ACQUIRE_T8              8
  55 #define MXT_GEN_DATASOURCE_T53          53
  56 #define MXT_TOUCH_MULTI_T9              9
  57 #define MXT_TOUCH_KEYARRAY_T15          15
  58 #define MXT_TOUCH_PROXIMITY_T23         23
  59 #define MXT_TOUCH_PROXKEY_T52           52
  60 #define MXT_PROCI_GRIPFACE_T20          20
  61 #define MXT_PROCG_NOISE_T22             22
  62 #define MXT_PROCI_ONETOUCH_T24          24
  63 #define MXT_PROCI_TWOTOUCH_T27          27
  64 #define MXT_PROCI_GRIP_T40              40
  65 #define MXT_PROCI_PALM_T41              41
  66 #define MXT_PROCI_TOUCHSUPPRESSION_T42  42
  67 #define MXT_PROCI_STYLUS_T47            47
  68 #define MXT_PROCG_NOISESUPPRESSION_T48  48
  69 #define MXT_SPT_COMMSCONFIG_T18         18
  70 #define MXT_SPT_GPIOPWM_T19             19
  71 #define MXT_SPT_SELFTEST_T25            25
  72 #define MXT_SPT_CTECONFIG_T28           28
  73 #define MXT_SPT_USERDATA_T38            38
  74 #define MXT_SPT_DIGITIZER_T43           43
  75 #define MXT_SPT_MESSAGECOUNT_T44        44
  76 #define MXT_SPT_CTECONFIG_T46           46
  77 #define MXT_TOUCH_MULTITOUCHSCREEN_T100 100
  78
  79 /* MXT_GEN_MESSAGE_T5 object */
  80 #define MXT_RPTID_NOMSG         0xff
  81
  82 /* MXT_GEN_COMMAND_T6 field */
  83 #define MXT_COMMAND_RESET       0
  84 #define MXT_COMMAND_BACKUPNV    1
  85 #define MXT_COMMAND_CALIBRATE   2
  86 #define MXT_COMMAND_REPORTALL   3
  87 #define MXT_COMMAND_DIAGNOSTIC  5
  88
  89 /* Define for T6 status byte */
  90 #define MXT_T6_STATUS_RESET     (1 << 7)
  91 #define MXT_T6_STATUS_OFL       (1 << 6)
  92 #define MXT_T6_STATUS_SIGERR    (1 << 5)
  93 #define MXT_T6_STATUS_CAL       (1 << 4)
  94 #define MXT_T6_STATUS_CFGERR    (1 << 3)
  95 #define MXT_T6_STATUS_COMSERR   (1 << 2)
  96
  97 /* MXT_GEN_POWER_T7 field */
  98 struct t7_config {
  99         u8 idle;
 100         u8 active;
 101 } __packed;
 102
 103 #define MXT_POWER_CFG_RUN               0
 104 #define MXT_POWER_CFG_DEEPSLEEP         1
 105
 106 /* MXT_TOUCH_MULTI_T9 field */
 107 #define MXT_T9_CTRL             0
 108 #define MXT_T9_XSIZE            3
 109 #define MXT_T9_YSIZE            4
 110 #define MXT_T9_ORIENT           9
 111 #define MXT_T9_RANGE            18
 112
 113 /* MXT_TOUCH_MULTI_T9 status */
 114 #define MXT_T9_UNGRIP           (1 << 0)
 115 #define MXT_T9_SUPPRESS         (1 << 1)
 116 #define MXT_T9_AMP              (1 << 2)
 117 #define MXT_T9_VECTOR           (1 << 3)
 118 #define MXT_T9_MOVE             (1 << 4)
 119 #define MXT_T9_RELEASE          (1 << 5)
 120 #define MXT_T9_PRESS            (1 << 6)
 121 #define MXT_T9_DETECT           (1 << 7)
 122
 123 struct t9_range {
 124         __le16 x;
 125         __le16 y;
 126 } __packed;
 127
 128 /* MXT_TOUCH_MULTI_T9 orient */
 129 #define MXT_T9_ORIENT_SWITCH    (1 << 0)
 130 #define MXT_T9_ORIENT_INVERTX   (1 << 1)
 131 #define MXT_T9_ORIENT_INVERTY   (1 << 2)
 132
 133 /* MXT_SPT_COMMSCONFIG_T18 */
 134 #define MXT_COMMS_CTRL          0
 135 #define MXT_COMMS_CMD           1
 136
 137 /* MXT_DEBUG_DIAGNOSTIC_T37 */
 138 #define MXT_DIAGNOSTIC_PAGEUP   0x01
 139 #define MXT_DIAGNOSTIC_DELTAS   0x10
 140 #define MXT_DIAGNOSTIC_REFS     0x11
 141 #define MXT_DIAGNOSTIC_SIZE     128
 142
 143 #define MXT_FAMILY_1386                 160
 144 #define MXT1386_COLUMNS                 3
 145 #define MXT1386_PAGES_PER_COLUMN        8
 146
 147 struct t37_debug {
 148 #ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
 149         u8 mode;
 150         u8 page;
 151         u8 data[MXT_DIAGNOSTIC_SIZE];
 152 #endif
 153 };
 154
 155 /* Define for MXT_GEN_COMMAND_T6 */
 156 #define MXT_BOOT_VALUE          0xa5
 157 #define MXT_RESET_VALUE         0x01
 158 #define MXT_BACKUP_VALUE        0x55
 159
 160 /* T100 Multiple Touch Touchscreen */
 161 #define MXT_T100_CTRL           0
 162 #define MXT_T100_CFG1           1
 163 #define MXT_T100_TCHAUX         3
 164 #define MXT_T100_XSIZE          9
 165 #define MXT_T100_XRANGE         13
 166 #define MXT_T100_YSIZE          20
 167 #define MXT_T100_YRANGE         24
 168
 169 #define MXT_T100_CFG_SWITCHXY   BIT(5)
 170 #define MXT_T100_CFG_INVERTY    BIT(6)
 171 #define MXT_T100_CFG_INVERTX    BIT(7)
 172
 173 #define MXT_T100_TCHAUX_VECT    BIT(0)
 174 #define MXT_T100_TCHAUX_AMPL    BIT(1)
 175 #define MXT_T100_TCHAUX_AREA    BIT(2)
 176
 177 #define MXT_T100_DETECT         BIT(7)
 178 #define MXT_T100_TYPE_MASK      0x70
 179
 180 enum t100_type {
 181         MXT_T100_TYPE_FINGER            = 1,
 182         MXT_T100_TYPE_PASSIVE_STYLUS    = 2,
 183         MXT_T100_TYPE_HOVERING_FINGER   = 4,
 184         MXT_T100_TYPE_GLOVE             = 5,
 185         MXT_T100_TYPE_LARGE_TOUCH       = 6,
 186 };
 187
 188 #define MXT_DISTANCE_ACTIVE_TOUCH       0
 189 #define MXT_DISTANCE_HOVERING           1
 190
 191 #define MXT_TOUCH_MAJOR_DEFAULT         1
 192 #define MXT_PRESSURE_DEFAULT            1
 193
 194 /* Delay times */
 195 #define MXT_BACKUP_TIME         50      /* msec */
 196 #define MXT_RESET_TIME          200     /* msec */
 197 #define MXT_RESET_TIMEOUT       3000    /* msec */
 198 #define MXT_CRC_TIMEOUT         1000    /* msec */
 199 #define MXT_FW_RESET_TIME       3000    /* msec */
 200 #define MXT_FW_CHG_TIMEOUT      300     /* msec */
 201
 202 /* Command to unlock bootloader */
 203 #define MXT_UNLOCK_CMD_MSB      0xaa
 204 #define MXT_UNLOCK_CMD_LSB      0xdc
 205
 206 /* Bootloader mode status */
 207 #define MXT_WAITING_BOOTLOAD_CMD        0xc0    /* valid 7 6 bit only */
 208 #define MXT_WAITING_FRAME_DATA  0x80    /* valid 7 6 bit only */
 209 #define MXT_FRAME_CRC_CHECK     0x02
 210 #define MXT_FRAME_CRC_FAIL      0x03
 211 #define MXT_FRAME_CRC_PASS      0x04
 212 #define MXT_APP_CRC_FAIL        0x40    /* valid 7 8 bit only */
 213 #define MXT_BOOT_STATUS_MASK    0x3f
 214 #define MXT_BOOT_EXTENDED_ID    (1 << 5)
 215 #define MXT_BOOT_ID_MASK        0x1f
 216
 217 /* Touchscreen absolute values */
 218 #define MXT_MAX_AREA            0xff
 219
 220 #define MXT_PIXELS_PER_MM       20
 221
 222 struct mxt_info {
 223         u8 family_id;
 224         u8 variant_id;
 225         u8 version;
 226         u8 build;
 227         u8 matrix_xsize;
 228         u8 matrix_ysize;
 229         u8 object_num;
 230 };
 231
 232 struct mxt_object {
 233         u8 type;
 234         u16 start_address;
 235         u8 size_minus_one;
 236         u8 instances_minus_one;
 237         u8 num_report_ids;
 238 } __packed;
 239
 240 struct mxt_dbg {
 241         u16 t37_address;
 242         u16 diag_cmd_address;
 243         struct t37_debug *t37_buf;
 244         unsigned int t37_pages;
 245         unsigned int t37_nodes;
 246
 247         struct v4l2_device v4l2;
 248         struct v4l2_pix_format format;
 249         struct video_device vdev;
 250         struct vb2_queue queue;
 251         struct mutex lock;
 252         int input;
 253 };
 254
 255 enum v4l_dbg_inputs {
 256         MXT_V4L_INPUT_DELTAS,
 257         MXT_V4L_INPUT_REFS,
 258         MXT_V4L_INPUT_MAX,
 259 };
 260
 261 static const struct v4l2_file_operations mxt_video_fops = {
 262         .owner = THIS_MODULE,
 263         .open = v4l2_fh_open,
 264         .release = vb2_fop_release,
 265         .unlocked_ioctl = video_ioctl2,
 266         .read = vb2_fop_read,
 267         .mmap = vb2_fop_mmap,
 268         .poll = vb2_fop_poll,
 269 };
 270
 271 /* Each client has this additional data */
 272 struct mxt_data {
 273         struct i2c_client *client;
 274         struct input_dev *input_dev;
 275         char phys[64];          /* device physical location */
 276         const struct mxt_platform_data *pdata;
 277         struct mxt_object *object_table;
 278         struct mxt_info info;
 279         unsigned int irq;
 280         unsigned int max_x;
 281         unsigned int max_y;
 282         bool invertx;
 283         bool inverty;
 284         bool xy_switch;
 285         u8 xsize;
 286         u8 ysize;
 287         bool in_bootloader;
 288         u16 mem_size;
 289         u8 t100_aux_ampl;
 290         u8 t100_aux_area;
 291         u8 t100_aux_vect;
 292         u8 max_reportid;
 293         u32 config_crc;
 294         u32 info_crc;
 295         u8 bootloader_addr;
 296         u8 *msg_buf;
 297         u8 t6_status;
 298         bool update_input;
 299         u8 last_message_count;
 300         u8 num_touchids;
 301         u8 multitouch;
 302         struct t7_config t7_cfg;
 303         struct mxt_dbg dbg;
 304         struct gpio_desc *reset_gpio;
 305
 306         /* Cached parameters from object table */
 307         u16 T5_address;
 308         u8 T5_msg_size;
 309         u8 T6_reportid;
 310         u16 T6_address;
 311         u16 T7_address;
 312         u8 T9_reportid_min;
 313         u8 T9_reportid_max;
 314         u8 T19_reportid;
 315         u16 T44_address;
 316         u8 T100_reportid_min;
 317         u8 T100_reportid_max;
 318
 319         /* for fw update in bootloader */
 320         struct completion bl_completion;
 321
 322         /* for reset handling */
 323         struct completion reset_completion;
 324
 325         /* for config update handling */
 326         struct completion crc_completion;
 327 };
 328
 329 struct mxt_vb2_buffer {
 330         struct vb2_buffer       vb;
 331         struct list_head        list;
 332 };
 333
 334 static size_t mxt_obj_size(const struct mxt_object *obj)
 335 {
 336         return obj->size_minus_one + 1;
 337 }
 338
 339 static size_t mxt_obj_instances(const struct mxt_object *obj)
 340 {
 341         return obj->instances_minus_one + 1;
 342 }
 343
 344 static bool mxt_object_readable(unsigned int type)
 345 {
 346         switch (type) {
 347         case MXT_GEN_COMMAND_T6:
 348         case MXT_GEN_POWER_T7:
 349         case MXT_GEN_ACQUIRE_T8:
 350         case MXT_GEN_DATASOURCE_T53:
 351         case MXT_TOUCH_MULTI_T9:
 352         case MXT_TOUCH_KEYARRAY_T15:
 353         case MXT_TOUCH_PROXIMITY_T23:
 354         case MXT_TOUCH_PROXKEY_T52:
 355         case MXT_TOUCH_MULTITOUCHSCREEN_T100:
 356         case MXT_PROCI_GRIPFACE_T20:
 357         case MXT_PROCG_NOISE_T22:
 358         case MXT_PROCI_ONETOUCH_T24:
 359         case MXT_PROCI_TWOTOUCH_T27:
 360         case MXT_PROCI_GRIP_T40:
 361         case MXT_PROCI_PALM_T41:
 362         case MXT_PROCI_TOUCHSUPPRESSION_T42:
 363         case MXT_PROCI_STYLUS_T47:
 364         case MXT_PROCG_NOISESUPPRESSION_T48:
 365         case MXT_SPT_COMMSCONFIG_T18:
 366         case MXT_SPT_GPIOPWM_T19:
 367         case MXT_SPT_SELFTEST_T25:
 368         case MXT_SPT_CTECONFIG_T28:
 369         case MXT_SPT_USERDATA_T38:
 370         case MXT_SPT_DIGITIZER_T43:
 371         case MXT_SPT_CTECONFIG_T46:
 372                 return true;
 373         default:
 374                 return false;
 375         }
 376 }
 377
 378 static void mxt_dump_message(struct mxt_data *data, u8 *message)
 379 {
 380         dev_dbg(&data->client->dev, "message: %*ph\n",
 381                 data->T5_msg_size, message);
 382 }
 383
 384 static int mxt_wait_for_completion(struct mxt_data *data,
 385                                    struct completion *comp,
 386                                    unsigned int timeout_ms)
 387 {
 388         struct device *dev = &data->client->dev;
 389         unsigned long timeout = msecs_to_jiffies(timeout_ms);
 390         long ret;
 391
 392         ret = wait_for_completion_interruptible_timeout(comp, timeout);
 393         if (ret < 0) {
 394                 return ret;
 395         } else if (ret == 0) {
 396                 dev_err(dev, "Wait for completion timed out.\n");
 397                 return -ETIMEDOUT;
 398         }
 399         return 0;
 400 }
 401
 402 static int mxt_bootloader_read(struct mxt_data *data,
 403                                u8 *val, unsigned int count)
 404 {
 405         int ret;
 406         struct i2c_msg msg;
 407
 408         msg.addr = data->bootloader_addr;
 409         msg.flags = data->client->flags & I2C_M_TEN;
 410         msg.flags |= I2C_M_RD;
 411         msg.len = count;
 412         msg.buf = val;
 413
 414         ret = i2c_transfer(data->client->adapter, &msg, 1);
 415         if (ret == 1) {
 416                 ret = 0;
 417         } else {
 418                 ret = ret < 0 ? ret : -EIO;
 419                 dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n",
 420                         __func__, ret);
 421         }
 422
 423         return ret;
 424 }
 425
 426 static int mxt_bootloader_write(struct mxt_data *data,
 427                                 const u8 * const val, unsigned int count)
 428 {
 429         int ret;
 430         struct i2c_msg msg;
 431
 432         msg.addr = data->bootloader_addr;
 433         msg.flags = data->client->flags & I2C_M_TEN;
 434         msg.len = count;
 435         msg.buf = (u8 *)val;
 436
 437         ret = i2c_transfer(data->client->adapter, &msg, 1);
 438         if (ret == 1) {
 439                 ret = 0;
 440         } else {
 441                 ret = ret < 0 ? ret : -EIO;
 442                 dev_err(&data->client->dev, "%s: i2c send failed (%d)\n",
 443                         __func__, ret);
 444         }
 445
 446         return ret;
 447 }
 448
 449 static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
 450 {
 451         u8 appmode = data->client->addr;
 452         u8 bootloader;
 453
 454         switch (appmode) {
 455         case 0x4a:
 456         case 0x4b:
 457                 /* Chips after 1664S use different scheme */
 458                 if (retry || data->info.family_id >= 0xa2) {
 459                         bootloader = appmode - 0x24;
 460                         break;
 461                 }
 462                 /* Fall through for normal case */
 463         case 0x4c:
 464         case 0x4d:
 465         case 0x5a:
 466         case 0x5b:
 467                 bootloader = appmode - 0x26;
 468                 break;
 469
 470         default:
 471                 dev_err(&data->client->dev,
 472                         "Appmode i2c address 0x%02x not found\n",
 473                         appmode);
 474                 return -EINVAL;
 475         }
 476
 477         data->bootloader_addr = bootloader;
 478         return 0;
 479 }
 480
 481 static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
 482 {
 483         struct device *dev = &data->client->dev;
 484         int error;
 485         u8 val;
 486         bool crc_failure;
 487
 488         error = mxt_lookup_bootloader_address(data, alt_address);
 489         if (error)
 490                 return error;
 491
 492         error = mxt_bootloader_read(data, &val, 1);
 493         if (error)
 494                 return error;
 495
 496         /* Check app crc fail mode */
 497         crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
 498
 499         dev_err(dev, "Detected bootloader, status:%02X%s\n",
 500                         val, crc_failure ? ", APP_CRC_FAIL" : "");
 501
 502         return 0;
 503 }
 504
 505 static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
 506 {
 507         struct device *dev = &data->client->dev;
 508         u8 buf[3];
 509
 510         if (val & MXT_BOOT_EXTENDED_ID) {
 511                 if (mxt_bootloader_read(data, &buf[0], 3) != 0) {
 512                         dev_err(dev, "%s: i2c failure\n", __func__);
 513                         return val;
 514                 }
 515
 516                 dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);
 517
 518                 return buf[0];
 519         } else {
 520                 dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);
 521
 522                 return val;
 523         }
 524 }
 525
 526 static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
 527                                 bool wait)
 528 {
 529         struct device *dev = &data->client->dev;
 530         u8 val;
 531         int ret;
 532
 533 recheck:
 534         if (wait) {
 535                 /*
 536                  * In application update mode, the interrupt
 537                  * line signals state transitions. We must wait for the
 538                  * CHG assertion before reading the status byte.
 539                  * Once the status byte has been read, the line is deasserted.
 540                  */
 541                 ret = mxt_wait_for_completion(data, &data->bl_completion,
 542                                               MXT_FW_CHG_TIMEOUT);
 543                 if (ret) {
 544                         /*
 545                          * TODO: handle -ERESTARTSYS better by terminating
 546                          * fw update process before returning to userspace
 547                          * by writing length 0x000 to device (iff we are in
 548                          * WAITING_FRAME_DATA state).
 549                          */
 550                         dev_err(dev, "Update wait error %d\n", ret);
 551                         return ret;
 552                 }
 553         }
 554
 555         ret = mxt_bootloader_read(data, &val, 1);
 556         if (ret)
 557                 return ret;
 558
 559         if (state == MXT_WAITING_BOOTLOAD_CMD)
 560                 val = mxt_get_bootloader_version(data, val);
 561
 562         switch (state) {
 563         case MXT_WAITING_BOOTLOAD_CMD:
 564         case MXT_WAITING_FRAME_DATA:
 565         case MXT_APP_CRC_FAIL:
 566                 val &= ~MXT_BOOT_STATUS_MASK;
 567                 break;
 568         case MXT_FRAME_CRC_PASS:
 569                 if (val == MXT_FRAME_CRC_CHECK) {
 570                         goto recheck;
 571                 } else if (val == MXT_FRAME_CRC_FAIL) {
 572                         dev_err(dev, "Bootloader CRC fail\n");
 573                         return -EINVAL;
 574                 }
 575                 break;
 576         default:
 577                 return -EINVAL;
 578         }
 579
 580         if (val != state) {
 581                 dev_err(dev, "Invalid bootloader state %02X != %02X\n",
 582                         val, state);
 583                 return -EINVAL;
 584         }
 585
 586         return 0;
 587 }
 588
 589 static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
 590 {
 591         int ret;
 592         u8 buf[2];
 593
 594         if (unlock) {
 595                 buf[0] = MXT_UNLOCK_CMD_LSB;
 596                 buf[1] = MXT_UNLOCK_CMD_MSB;
 597         } else {
 598                 buf[0] = 0x01;
 599                 buf[1] = 0x01;
 600         }
 601
 602         ret = mxt_bootloader_write(data, buf, 2);
 603         if (ret)
 604                 return ret;
 605
 606         return 0;
 607 }
 608
 609 static int __mxt_read_reg(struct i2c_client *client,
 610                                u16 reg, u16 len, void *val)
 611 {
 612         struct i2c_msg xfer[2];
 613         u8 buf[2];
 614         int ret;
 615
 616         buf[0] = reg & 0xff;
 617         buf[1] = (reg >> 8) & 0xff;
 618
 619         /* Write register */
 620         xfer[0].addr = client->addr;
 621         xfer[0].flags = 0;
 622         xfer[0].len = 2;
 623         xfer[0].buf = buf;
 624
 625         /* Read data */
 626         xfer[1].addr = client->addr;
 627         xfer[1].flags = I2C_M_RD;
 628         xfer[1].len = len;
 629         xfer[1].buf = val;
 630
 631         ret = i2c_transfer(client->adapter, xfer, 2);
 632         if (ret == 2) {
 633                 ret = 0;
 634         } else {
 635                 if (ret >= 0)
 636                         ret = -EIO;
 637                 dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
 638                         __func__, ret);
 639         }
 640
 641         return ret;
 642 }
 643
 644 static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
 645                            const void *val)
 646 {
 647         u8 *buf;
 648         size_t count;
 649         int ret;
 650
 651         count = len + 2;
 652         buf = kmalloc(count, GFP_KERNEL);
 653         if (!buf)
 654                 return -ENOMEM;
 655
 656         buf[0] = reg & 0xff;
 657         buf[1] = (reg >> 8) & 0xff;
 658         memcpy(&buf[2], val, len);
 659
 660         ret = i2c_master_send(client, buf, count);
 661         if (ret == count) {
 662                 ret = 0;
 663         } else {
 664                 if (ret >= 0)
 665                         ret = -EIO;
 666                 dev_err(&client->dev, "%s: i2c send failed (%d)\n",
 667                         __func__, ret);
 668         }
 669
 670         kfree(buf);
 671         return ret;
 672 }
 673
 674 static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
 675 {
 676         return __mxt_write_reg(client, reg, 1, &val);
 677 }
 678
 679 static struct mxt_object *
 680 mxt_get_object(struct mxt_data *data, u8 type)
 681 {
 682         struct mxt_object *object;
 683         int i;
 684
 685         for (i = 0; i < data->info.object_num; i++) {
 686                 object = data->object_table + i;
 687                 if (object->type == type)
 688                         return object;
 689         }
 690
 691         dev_warn(&data->client->dev, "Invalid object type T%u\n", type);
 692         return NULL;
 693 }
 694
 695 static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg)
 696 {
 697         struct device *dev = &data->client->dev;
 698         u8 status = msg[1];
 699         u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16);
 700
 701         complete(&data->crc_completion);
 702
 703         if (crc != data->config_crc) {
 704                 data->config_crc = crc;
 705                 dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc);
 706         }
 707
 708         /* Detect reset */
 709         if (status & MXT_T6_STATUS_RESET)
 710                 complete(&data->reset_completion);
 711
 712         /* Output debug if status has changed */
 713         if (status != data->t6_status)
 714                 dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n",
 715                         status,
 716                         status == 0 ? " OK" : "",
 717                         status & MXT_T6_STATUS_RESET ? " RESET" : "",
 718                         status & MXT_T6_STATUS_OFL ? " OFL" : "",
 719                         status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "",
 720                         status & MXT_T6_STATUS_CAL ? " CAL" : "",
 721                         status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "",
 722                         status & MXT_T6_STATUS_COMSERR ? " COMSERR" : "");
 723
 724         /* Save current status */
 725         data->t6_status = status;
 726 }
 727
 728 static int mxt_write_object(struct mxt_data *data,
 729                                  u8 type, u8 offset, u8 val)
 730 {
 731         struct mxt_object *object;
 732         u16 reg;
 733
 734         object = mxt_get_object(data, type);
 735         if (!object || offset >= mxt_obj_size(object))
 736                 return -EINVAL;
 737
 738         reg = object->start_address;
 739         return mxt_write_reg(data->client, reg + offset, val);
 740 }
 741
 742 static void mxt_input_button(struct mxt_data *data, u8 *message)
 743 {
 744         struct input_dev *input = data->input_dev;
 745         const struct mxt_platform_data *pdata = data->pdata;
 746         int i;
 747
 748         for (i = 0; i < pdata->t19_num_keys; i++) {
 749                 if (pdata->t19_keymap[i] == KEY_RESERVED)
 750                         continue;
 751
 752                 /* Active-low switch */
 753                 input_report_key(input, pdata->t19_keymap[i],
 754                                  !(message[1] & BIT(i)));
 755         }
 756 }
 757
 758 static void mxt_input_sync(struct mxt_data *data)
 759 {
 760         input_mt_report_pointer_emulation(data->input_dev,
 761                                           data->pdata->t19_num_keys);
 762         input_sync(data->input_dev);
 763 }
 764
 765 static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 766 {
 767         struct device *dev = &data->client->dev;
 768         struct input_dev *input_dev = data->input_dev;
 769         int id;
 770         u8 status;
 771         int x;
 772         int y;
 773         int area;
 774         int amplitude;
 775
 776         id = message[0] - data->T9_reportid_min;
 777         status = message[1];
 778         x = (message[2] << 4) | ((message[4] >> 4) & 0xf);
 779         y = (message[3] << 4) | ((message[4] & 0xf));
 780
 781         /* Handle 10/12 bit switching */
 782         if (data->max_x < 1024)
 783                 x >>= 2;
 784         if (data->max_y < 1024)
 785                 y >>= 2;
 786
 787         area = message[5];
 788         amplitude = message[6];
 789
 790         dev_dbg(dev,
 791                 "[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
 792                 id,
 793                 (status & MXT_T9_DETECT) ? 'D' : '.',
 794                 (status & MXT_T9_PRESS) ? 'P' : '.',
 795                 (status & MXT_T9_RELEASE) ? 'R' : '.',
 796                 (status & MXT_T9_MOVE) ? 'M' : '.',
 797                 (status & MXT_T9_VECTOR) ? 'V' : '.',
 798                 (status & MXT_T9_AMP) ? 'A' : '.',
 799                 (status & MXT_T9_SUPPRESS) ? 'S' : '.',
 800                 (status & MXT_T9_UNGRIP) ? 'U' : '.',
 801                 x, y, area, amplitude);
 802
 803         input_mt_slot(input_dev, id);
 804
 805         if (status & MXT_T9_DETECT) {
 806                 /*
 807                  * Multiple bits may be set if the host is slow to read
 808                  * the status messages, indicating all the events that
 809                  * have happened.
 810                  */
 811                 if (status & MXT_T9_RELEASE) {
 812                         input_mt_report_slot_state(input_dev,
 813                                                    MT_TOOL_FINGER, 0);
 814                         mxt_input_sync(data);
 815                 }
 816
 817                 /* Touch active */
 818                 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1);
 819                 input_report_abs(input_dev, ABS_MT_POSITION_X, x);
 820                 input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
 821                 input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);
 822                 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
 823         } else {
 824                 /* Touch no longer active, close out slot */
 825                 input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 0);
 826         }
 827
 828         data->update_input = true;
 829 }
 830
 831 static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
 832 {
 833         struct device *dev = &data->client->dev;
 834         struct input_dev *input_dev = data->input_dev;
 835         int id;
 836         u8 status;
 837         u8 type = 0;
 838         u16 x;
 839         u16 y;
 840         int distance = 0;
 841         int tool = 0;
 842         u8 major = 0;
 843         u8 pressure = 0;
 844         u8 orientation = 0;
 845
 846         id = message[0] - data->T100_reportid_min - 2;
 847
 848         /* ignore SCRSTATUS events */
 849         if (id < 0)
 850                 return;
 851
 852         status = message[1];
 853         x = get_unaligned_le16(&message[2]);
 854         y = get_unaligned_le16(&message[4]);
 855
 856         if (status & MXT_T100_DETECT) {
 857                 type = (status & MXT_T100_TYPE_MASK) >> 4;
 858
 859                 switch (type) {
 860                 case MXT_T100_TYPE_HOVERING_FINGER:
 861                         tool = MT_TOOL_FINGER;
 862                         distance = MXT_DISTANCE_HOVERING;
 863
 864                         if (data->t100_aux_vect)
 865                                 orientation = message[data->t100_aux_vect];
 866
 867                         break;
 868
 869                 case MXT_T100_TYPE_FINGER:
 870                 case MXT_T100_TYPE_GLOVE:
 871                         tool = MT_TOOL_FINGER;
 872                         distance = MXT_DISTANCE_ACTIVE_TOUCH;
 873
 874                         if (data->t100_aux_area)
 875                                 major = message[data->t100_aux_area];
 876
 877                         if (data->t100_aux_ampl)
 878                                 pressure = message[data->t100_aux_ampl];
 879
 880                         if (data->t100_aux_vect)
 881                                 orientation = message[data->t100_aux_vect];
 882
 883                         break;
 884
 885                 case MXT_T100_TYPE_PASSIVE_STYLUS:
 886                         tool = MT_TOOL_PEN;
 887
 888                         /*
 889                          * Passive stylus is reported with size zero so
 890                          * hardcode.
 891                          */
 892                         major = MXT_TOUCH_MAJOR_DEFAULT;
 893
 894                         if (data->t100_aux_ampl)
 895                                 pressure = message[data->t100_aux_ampl];
 896
 897                         break;
 898
 899                 case MXT_T100_TYPE_LARGE_TOUCH:
 900                         /* Ignore suppressed touch */
 901                         break;
 902
 903                 default:
 904                         dev_dbg(dev, "Unexpected T100 type\n");
 905                         return;
 906                 }
 907         }
 908
 909         /*
 910          * Values reported should be non-zero if tool is touching the
 911          * device
 912          */
 913         if (!pressure && type != MXT_T100_TYPE_HOVERING_FINGER)
 914                 pressure = MXT_PRESSURE_DEFAULT;
 915
 916         input_mt_slot(input_dev, id);
 917
 918         if (status & MXT_T100_DETECT) {
 919                 dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n",
 920                         id, type, x, y, major, pressure, orientation);
 921
 922                 input_mt_report_slot_state(input_dev, tool, 1);
 923                 input_report_abs(input_dev, ABS_MT_POSITION_X, x);
 924                 input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
 925                 input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, major);
 926                 input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
 927                 input_report_abs(input_dev, ABS_MT_DISTANCE, distance);
 928                 input_report_abs(input_dev, ABS_MT_ORIENTATION, orientation);
 929         } else {
 930                 dev_dbg(dev, "[%u] release\n", id);
 931
 932                 /* close out slot */
 933                 input_mt_report_slot_state(input_dev, 0, 0);
 934         }
 935
 936         data->update_input = true;
 937 }
 938
 939 static int mxt_proc_message(struct mxt_data *data, u8 *message)
 940 {
 941         u8 report_id = message[0];
 942
 943         if (report_id == MXT_RPTID_NOMSG)
 944                 return 0;
 945
 946         if (report_id == data->T6_reportid) {
 947                 mxt_proc_t6_messages(data, message);
 948         } else if (!data->input_dev) {
 949                 /*
 950                  * Do not report events if input device
 951                  * is not yet registered.
 952                  */
 953                 mxt_dump_message(data, message);
 954         } else if (report_id >= data->T9_reportid_min &&
 955                    report_id <= data->T9_reportid_max) {
 956                 mxt_proc_t9_message(data, message);
 957         } else if (report_id >= data->T100_reportid_min &&
 958                    report_id <= data->T100_reportid_max) {
 959                 mxt_proc_t100_message(data, message);
 960         } else if (report_id == data->T19_reportid) {
 961                 mxt_input_button(data, message);
 962                 data->update_input = true;
 963         } else {
 964                 mxt_dump_message(data, message);
 965         }
 966
 967         return 1;
 968 }
 969
 970 static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
 971 {
 972         struct device *dev = &data->client->dev;
 973         int ret;
 974         int i;
 975         u8 num_valid = 0;
 976
 977         /* Safety check for msg_buf */
 978         if (count > data->max_reportid)
 979                 return -EINVAL;
 980
 981         /* Process remaining messages if necessary */
 982         ret = __mxt_read_reg(data->client, data->T5_address,
 983                                 data->T5_msg_size * count, data->msg_buf);
 984         if (ret) {
 985                 dev_err(dev, "Failed to read %u messages (%d)\n", count, ret);
 986                 return ret;
 987         }
 988
 989         for (i = 0;  i < count; i++) {
 990                 ret = mxt_proc_message(data,
 991                         data->msg_buf + data->T5_msg_size * i);
 992
 993                 if (ret == 1)
 994                         num_valid++;
 995         }
 996
 997         /* return number of messages read */
 998         return num_valid;
 999 }
1000
1001 static irqreturn_t mxt_process_messages_t44(struct mxt_data *data)
1002 {
1003         struct device *dev = &data->client->dev;
1004         int ret;
1005         u8 count, num_left;
1006
1007         /* Read T44 and T5 together */
1008         ret = __mxt_read_reg(data->client, data->T44_address,
1009                 data->T5_msg_size + 1, data->msg_buf);
1010         if (ret) {
1011                 dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret);
1012                 return IRQ_NONE;
1013         }
1014
1015         count = data->msg_buf[0];
1016
1017         /*
1018          * This condition may be caused by the CHG line being configured in
1019          * Mode 0. It results in unnecessary I2C operations but it is benign.
1020          */
1021         if (count == 0)
1022                 return IRQ_NONE;
1023
1024         if (count > data->max_reportid) {
1025                 dev_warn(dev, "T44 count %d exceeded max report id\n", count);
1026                 count = data->max_reportid;
1027         }
1028
1029         /* Process first message */
1030         ret = mxt_proc_message(data, data->msg_buf + 1);
1031         if (ret < 0) {
1032                 dev_warn(dev, "Unexpected invalid message\n");
1033                 return IRQ_NONE;
1034         }
1035
1036         num_left = count - 1;
1037
1038         /* Process remaining messages if necessary */
1039         if (num_left) {
1040                 ret = mxt_read_and_process_messages(data, num_left);
1041                 if (ret < 0)
1042                         goto end;
1043                 else if (ret != num_left)
1044                         dev_warn(dev, "Unexpected invalid message\n");
1045         }
1046
1047 end:
1048         if (data->update_input) {
1049                 mxt_input_sync(data);
1050                 data->update_input = false;
1051         }
1052
1053         return IRQ_HANDLED;
1054 }
1055
1056 static int mxt_process_messages_until_invalid(struct mxt_data *data)
1057 {
1058         struct device *dev = &data->client->dev;
1059         int count, read;
1060         u8 tries = 2;
1061
1062         count = data->max_reportid;
1063
1064         /* Read messages until we force an invalid */
1065         do {
1066                 read = mxt_read_and_process_messages(data, count);
1067                 if (read < count)
1068                         return 0;
1069         } while (--tries);
1070
1071         if (data->update_input) {
1072                 mxt_input_sync(data);
1073                 data->update_input = false;
1074         }
1075
1076         dev_err(dev, "CHG pin isn't cleared\n");
1077         return -EBUSY;
1078 }
1079
1080 static irqreturn_t mxt_process_messages(struct mxt_data *data)
1081 {
1082         int total_handled, num_handled;
1083         u8 count = data->last_message_count;
1084
1085         if (count < 1 || count > data->max_reportid)
1086                 count = 1;
1087
1088         /* include final invalid message */
1089         total_handled = mxt_read_and_process_messages(data, count + 1);
1090         if (total_handled < 0)
1091                 return IRQ_NONE;
1092         /* if there were invalid messages, then we are done */
1093         else if (total_handled <= count)
1094                 goto update_count;
1095
1096         /* keep reading two msgs until one is invalid or reportid limit */
1097         do {
1098                 num_handled = mxt_read_and_process_messages(data, 2);
1099                 if (num_handled < 0)
1100                         return IRQ_NONE;
1101
1102                 total_handled += num_handled;
1103
1104                 if (num_handled < 2)
1105                         break;
1106         } while (total_handled < data->num_touchids);
1107
1108 update_count:
1109         data->last_message_count = total_handled;
1110
1111         if (data->update_input) {
1112                 mxt_input_sync(data);
1113                 data->update_input = false;
1114         }
1115
1116         return IRQ_HANDLED;
1117 }
1118
1119 static irqreturn_t mxt_interrupt(int irq, void *dev_id)
1120 {
1121         struct mxt_data *data = dev_id;
1122
1123         if (data->in_bootloader) {
1124                 /* bootloader state transition completion */
1125                 complete(&data->bl_completion);
1126                 return IRQ_HANDLED;
1127         }
1128
1129         if (!data->object_table)
1130                 return IRQ_HANDLED;
1131
1132         if (data->T44_address) {
1133                 return mxt_process_messages_t44(data);
1134         } else {
1135                 return mxt_process_messages(data);
1136         }
1137 }
1138
1139 static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
1140                           u8 value, bool wait)
1141 {
1142         u16 reg;
1143         u8 command_register;
1144         int timeout_counter = 0;
1145         int ret;
1146
1147         reg = data->T6_address + cmd_offset;
1148
1149         ret = mxt_write_reg(data->client, reg, value);
1150         if (ret)
1151                 return ret;
1152
1153         if (!wait)
1154                 return 0;
1155
1156         do {
1157                 msleep(20);
1158                 ret = __mxt_read_reg(data->client, reg, 1, &command_register);
1159                 if (ret)
1160                         return ret;
1161         } while (command_register != 0 && timeout_counter++ <= 100);
1162
1163         if (timeout_counter > 100) {
1164                 dev_err(&data->client->dev, "Command failed!\n");
1165                 return -EIO;
1166         }
1167
1168         return 0;
1169 }
1170
1171 static int mxt_acquire_irq(struct mxt_data *data)
1172 {
1173         int error;
1174
1175         enable_irq(data->irq);
1176
1177         error = mxt_process_messages_until_invalid(data);
1178         if (error)
1179                 return error;
1180
1181         return 0;
1182 }
1183
1184 static int mxt_soft_reset(struct mxt_data *data)
1185 {
1186         struct device *dev = &data->client->dev;
1187         int ret = 0;
1188
1189         dev_info(dev, "Resetting device\n");
1190
1191         disable_irq(data->irq);
1192
1193         reinit_completion(&data->reset_completion);
1194
1195         ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false);
1196         if (ret)
1197                 return ret;
1198
1199         /* Ignore CHG line for 100ms after reset */
1200         msleep(100);
1201
1202         mxt_acquire_irq(data);
1203
1204         ret = mxt_wait_for_completion(data, &data->reset_completion,
1205                                       MXT_RESET_TIMEOUT);
1206         if (ret)
1207                 return ret;
1208
1209         return 0;
1210 }
1211
1212 static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value)
1213 {
1214         /*
1215          * On failure, CRC is set to 0 and config will always be
1216          * downloaded.
1217          */
1218         data->config_crc = 0;
1219         reinit_completion(&data->crc_completion);
1220
1221         mxt_t6_command(data, cmd, value, true);
1222
1223         /*
1224          * Wait for crc message. On failure, CRC is set to 0 and config will
1225          * always be downloaded.
1226          */
1227         mxt_wait_for_completion(data, &data->crc_completion, MXT_CRC_TIMEOUT);
1228 }
1229
1230 static void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte)
1231 {
1232         static const unsigned int crcpoly = 0x80001B;
1233         u32 result;
1234         u32 data_word;
1235
1236         data_word = (secondbyte << 8) | firstbyte;
1237         result = ((*crc << 1) ^ data_word);
1238
1239         if (result & 0x1000000)
1240                 result ^= crcpoly;
1241
1242         *crc = result;
1243 }
1244
1245 static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
1246 {
1247         u32 crc = 0;
1248         u8 *ptr = base + start_off;
1249         u8 *last_val = base + end_off - 1;
1250
1251         if (end_off < start_off)
1252                 return -EINVAL;
1253
1254         while (ptr < last_val) {
1255                 mxt_calc_crc24(&crc, *ptr, *(ptr + 1));
1256                 ptr += 2;
1257         }
1258
1259         /* if len is odd, fill the last byte with 0 */
1260         if (ptr == last_val)
1261                 mxt_calc_crc24(&crc, *ptr, 0);
1262
1263         /* Mask to 24-bit */
1264         crc &= 0x00FFFFFF;
1265
1266         return crc;
1267 }
1268
1269 static int mxt_prepare_cfg_mem(struct mxt_data *data,
1270                                const struct firmware *cfg,
1271                                unsigned int data_pos,
1272                                unsigned int cfg_start_ofs,
1273                                u8 *config_mem,
1274                                size_t config_mem_size)
1275 {
1276         struct device *dev = &data->client->dev;
1277         struct mxt_object *object;
1278         unsigned int type, instance, size, byte_offset;
1279         int offset;
1280         int ret;
1281         int i;
1282         u16 reg;
1283         u8 val;
1284
1285         while (data_pos < cfg->size) {
1286                 /* Read type, instance, length */
1287                 ret = sscanf(cfg->data + data_pos, "%x %x %x%n",
1288                              &type, &instance, &size, &offset);
1289                 if (ret == 0) {
1290                         /* EOF */
1291                         break;
1292                 } else if (ret != 3) {
1293                         dev_err(dev, "Bad format: failed to parse object\n");
1294                         return -EINVAL;
1295                 }
1296                 data_pos += offset;
1297
1298                 object = mxt_get_object(data, type);
1299                 if (!object) {
1300                         /* Skip object */
1301                         for (i = 0; i < size; i++) {
1302                                 ret = sscanf(cfg->data + data_pos, "%hhx%n",
1303                                              &val, &offset);
1304                                 if (ret != 1) {
1305                                         dev_err(dev, "Bad format in T%d at %d\n",
1306                                                 type, i);
1307                                         return -EINVAL;
1308                                 }
1309                                 data_pos += offset;
1310                         }
1311                         continue;
1312                 }
1313
1314                 if (size > mxt_obj_size(object)) {
1315                         /*
1316                          * Either we are in fallback mode due to wrong
1317                          * config or config from a later fw version,
1318                          * or the file is corrupt or hand-edited.
1319                          */
1320                         dev_warn(dev, "Discarding %zu byte(s) in T%u\n",
1321                                  size - mxt_obj_size(object), type);
1322                 } else if (mxt_obj_size(object) > size) {
1323                         /*
1324                          * If firmware is upgraded, new bytes may be added to
1325                          * end of objects. It is generally forward compatible
1326                          * to zero these bytes - previous behaviour will be
1327                          * retained. However this does invalidate the CRC and
1328                          * will force fallback mode until the configuration is
1329                          * updated. We warn here but do nothing else - the
1330                          * malloc has zeroed the entire configuration.
1331                          */
1332                         dev_warn(dev, "Zeroing %zu byte(s) in T%d\n",
1333                                  mxt_obj_size(object) - size, type);
1334                 }
1335
1336                 if (instance >= mxt_obj_instances(object)) {
1337                         dev_err(dev, "Object instances exceeded!\n");
1338                         return -EINVAL;
1339                 }
1340
1341                 reg = object->start_address + mxt_obj_size(object) * instance;
1342
1343                 for (i = 0; i < size; i++) {
1344                         ret = sscanf(cfg->data + data_pos, "%hhx%n",
1345                                      &val,
1346                                      &offset);
1347                         if (ret != 1) {
1348                                 dev_err(dev, "Bad format in T%d at %d\n",
1349                                         type, i);
1350                                 return -EINVAL;
1351                         }
1352                         data_pos += offset;
1353
1354                         if (i > mxt_obj_size(object))
1355                                 continue;
1356
1357                         byte_offset = reg + i - cfg_start_ofs;
1358
1359                         if (byte_offset >= 0 && byte_offset < config_mem_size) {
1360                                 *(config_mem + byte_offset) = val;
1361                         } else {
1362                                 dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
1363                                         reg, object->type, byte_offset);
1364                                 return -EINVAL;
1365                         }
1366                 }
1367         }
1368
1369         return 0;
1370 }
1371
1372 static int mxt_upload_cfg_mem(struct mxt_data *data, unsigned int cfg_start,
1373                               u8 *config_mem, size_t config_mem_size)
1374 {
1375         unsigned int byte_offset = 0;
1376         int error;
1377
1378         /* Write configuration as blocks */
1379         while (byte_offset < config_mem_size) {
1380                 unsigned int size = config_mem_size - byte_offset;
1381
1382                 if (size > MXT_MAX_BLOCK_WRITE)
1383                         size = MXT_MAX_BLOCK_WRITE;
1384
1385                 error = __mxt_write_reg(data->client,
1386                                         cfg_start + byte_offset,
1387                                         size, config_mem + byte_offset);
1388                 if (error) {
1389                         dev_err(&data->client->dev,
1390                                 "Config write error, ret=%d\n", error);
1391                         return error;
1392                 }
1393
1394                 byte_offset += size;
1395         }
1396
1397         return 0;
1398 }
1399
1400 static int mxt_init_t7_power_cfg(struct mxt_data *data);
1401
1402 /*
1403  * mxt_update_cfg - download configuration to chip
1404  *
1405  * Atmel Raw Config File Format
1406  *
1407  * The first four lines of the raw config file contain:
1408  *  1) Version
1409  *  2) Chip ID Information (first 7 bytes of device memory)
1410  *  3) Chip Information Block 24-bit CRC Checksum
1411  *  4) Chip Configuration 24-bit CRC Checksum
1412  *
1413  * The rest of the file consists of one line per object instance:
1414  *   <TYPE> <INSTANCE> <SIZE> <CONTENTS>
1415  *
1416  *   <TYPE> - 2-byte object type as hex
1417  *   <INSTANCE> - 2-byte object instance number as hex
1418  *   <SIZE> - 2-byte object size as hex
1419  *   <CONTENTS> - array of <SIZE> 1-byte hex values
1420  */
1421 static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg)
1422 {
1423         struct device *dev = &data->client->dev;
1424         struct mxt_info cfg_info;
1425         int ret;
1426         int offset;
1427         int data_pos;
1428         int i;
1429         int cfg_start_ofs;
1430         u32 info_crc, config_crc, calculated_crc;
1431         u8 *config_mem;
1432         size_t config_mem_size;
1433
1434         mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);
1435
1436         if (strncmp(cfg->data, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
1437                 dev_err(dev, "Unrecognised config file\n");
1438                 return -EINVAL;
1439         }
1440
1441         data_pos = strlen(MXT_CFG_MAGIC);
1442
1443         /* Load information block and check */
1444         for (i = 0; i < sizeof(struct mxt_info); i++) {
1445                 ret = sscanf(cfg->data + data_pos, "%hhx%n",
1446                              (unsigned char *)&cfg_info + i,
1447                              &offset);
1448                 if (ret != 1) {
1449                         dev_err(dev, "Bad format\n");
1450                         return -EINVAL;
1451                 }
1452
1453                 data_pos += offset;
1454         }
1455
1456         if (cfg_info.family_id != data->info.family_id) {
1457                 dev_err(dev, "Family ID mismatch!\n");
1458                 return -EINVAL;
1459         }
1460
1461         if (cfg_info.variant_id != data->info.variant_id) {
1462                 dev_err(dev, "Variant ID mismatch!\n");
1463                 return -EINVAL;
1464         }
1465
1466         /* Read CRCs */
1467         ret = sscanf(cfg->data + data_pos, "%x%n", &info_crc, &offset);
1468         if (ret != 1) {
1469                 dev_err(dev, "Bad format: failed to parse Info CRC\n");
1470                 return -EINVAL;
1471         }
1472         data_pos += offset;
1473
1474         ret = sscanf(cfg->data + data_pos, "%x%n", &config_crc, &offset);
1475         if (ret != 1) {
1476                 dev_err(dev, "Bad format: failed to parse Config CRC\n");
1477                 return -EINVAL;
1478         }
1479         data_pos += offset;
1480
1481         /*
1482          * The Info Block CRC is calculated over mxt_info and the object
1483          * table. If it does not match then we are trying to load the
1484          * configuration from a different chip or firmware version, so
1485          * the configuration CRC is invalid anyway.
1486          */
1487         if (info_crc == data->info_crc) {
1488                 if (config_crc == 0 || data->config_crc == 0) {
1489                         dev_info(dev, "CRC zero, attempting to apply config\n");
1490                 } else if (config_crc == data->config_crc) {
1491                         dev_dbg(dev, "Config CRC 0x%06X: OK\n",
1492                                  data->config_crc);
1493                         return 0;
1494                 } else {
1495                         dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
1496                                  data->config_crc, config_crc);
1497                 }
1498         } else {
1499                 dev_warn(dev,
1500                          "Warning: Info CRC error - device=0x%06X file=0x%06X\n",
1501                          data->info_crc, info_crc);
1502         }
1503
1504         /* Malloc memory to store configuration */
1505         cfg_start_ofs = MXT_OBJECT_START +
1506                         data->info.object_num * sizeof(struct mxt_object) +
1507                         MXT_INFO_CHECKSUM_SIZE;
1508         config_mem_size = data->mem_size - cfg_start_ofs;
1509         config_mem = kzalloc(config_mem_size, GFP_KERNEL);
1510         if (!config_mem) {
1511                 dev_err(dev, "Failed to allocate memory\n");
1512                 return -ENOMEM;
1513         }
1514
1515         ret = mxt_prepare_cfg_mem(data, cfg, data_pos, cfg_start_ofs,
1516                                   config_mem, config_mem_size);
1517         if (ret)
1518                 goto release_mem;
1519
1520         /* Calculate crc of the received configs (not the raw config file) */
1521         if (data->T7_address < cfg_start_ofs) {
1522                 dev_err(dev, "Bad T7 address, T7addr = %x, config offset %x\n",
1523                         data->T7_address, cfg_start_ofs);
1524                 ret = 0;
1525                 goto release_mem;
1526         }
1527
1528         calculated_crc = mxt_calculate_crc(config_mem,
1529                                            data->T7_address - cfg_start_ofs,
1530                                            config_mem_size);
1531
1532         if (config_crc > 0 && config_crc != calculated_crc)
1533                 dev_warn(dev, "Config CRC error, calculated=%06X, file=%06X\n",
1534                          calculated_crc, config_crc);
1535
1536         ret = mxt_upload_cfg_mem(data, cfg_start_ofs,
1537                                  config_mem, config_mem_size);
1538         if (ret)
1539                 goto release_mem;
1540
1541         mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);
1542
1543         ret = mxt_soft_reset(data);
1544         if (ret)
1545                 goto release_mem;
1546
1547         dev_info(dev, "Config successfully updated\n");
1548
1549         /* T7 config may have changed */
1550         mxt_init_t7_power_cfg(data);
1551
1552 release_mem:
1553         kfree(config_mem);
1554         return ret;
1555 }
1556
1557 static int mxt_get_info(struct mxt_data *data)
1558 {
1559         struct i2c_client *client = data->client;
1560         struct mxt_info *info = &data->info;
1561         int error;
1562
1563         /* Read 7-byte info block starting at address 0 */
1564         error = __mxt_read_reg(client, 0, sizeof(*info), info);
1565         if (error)
1566                 return error;
1567
1568         return 0;
1569 }
1570
1571 static void mxt_free_input_device(struct mxt_data *data)
1572 {
1573         if (data->input_dev) {
1574                 input_unregister_device(data->input_dev);
1575                 data->input_dev = NULL;
1576         }
1577 }
1578
1579 static void mxt_free_object_table(struct mxt_data *data)
1580 {
1581 #ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
1582         video_unregister_device(&data->dbg.vdev);
1583         v4l2_device_unregister(&data->dbg.v4l2);
1584 #endif
1585
1586         kfree(data->object_table);
1587         data->object_table = NULL;
1588         kfree(data->msg_buf);
1589         data->msg_buf = NULL;
1590         data->T5_address = 0;
1591         data->T5_msg_size = 0;
1592         data->T6_reportid = 0;
1593         data->T7_address = 0;
1594         data->T9_reportid_min = 0;
1595         data->T9_reportid_max = 0;
1596         data->T19_reportid = 0;
1597         data->T44_address = 0;
1598         data->T100_reportid_min = 0;
1599         data->T100_reportid_max = 0;
1600         data->max_reportid = 0;
1601 }
1602
1603 static int mxt_get_object_table(struct mxt_data *data)
1604 {
1605         struct i2c_client *client = data->client;
1606         size_t table_size;
1607         struct mxt_object *object_table;
1608         int error;
1609         int i;
1610         u8 reportid;
1611         u16 end_address;
1612
1613         table_size = data->info.object_num * sizeof(struct mxt_object);
1614         object_table = kzalloc(table_size, GFP_KERNEL);
1615         if (!object_table) {
1616                 dev_err(&data->client->dev, "Failed to allocate memory\n");
1617                 return -ENOMEM;
1618         }
1619
1620         error = __mxt_read_reg(client, MXT_OBJECT_START, table_size,
1621                         object_table);
1622         if (error) {
1623                 kfree(object_table);
1624                 return error;
1625         }
1626
1627         /* Valid Report IDs start counting from 1 */
1628         reportid = 1;
1629         data->mem_size = 0;
1630         for (i = 0; i < data->info.object_num; i++) {
1631                 struct mxt_object *object = object_table + i;
1632                 u8 min_id, max_id;
1633
1634                 le16_to_cpus(&object->start_address);
1635
1636                 if (object->num_report_ids) {
1637                         min_id = reportid;
1638                         reportid += object->num_report_ids *
1639                                         mxt_obj_instances(object);
1640                         max_id = reportid - 1;
1641                 } else {
1642                         min_id = 0;
1643                         max_id = 0;
1644                 }
1645
1646                 dev_dbg(&data->client->dev,
1647                         "T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n",
1648                         object->type, object->start_address,
1649                         mxt_obj_size(object), mxt_obj_instances(object),
1650                         min_id, max_id);
1651
1652                 switch (object->type) {
1653                 case MXT_GEN_MESSAGE_T5:
1654                         if (data->info.family_id == 0x80 &&
1655                             data->info.version < 0x20) {
1656                                 /*
1657                                  * On mXT224 firmware versions prior to V2.0
1658                                  * read and discard unused CRC byte otherwise
1659                                  * DMA reads are misaligned.
1660                                  */
1661                                 data->T5_msg_size = mxt_obj_size(object);
1662                         } else {
1663                                 /* CRC not enabled, so skip last byte */
1664                                 data->T5_msg_size = mxt_obj_size(object) - 1;
1665                         }
1666                         data->T5_address = object->start_address;
1667                         break;
1668                 case MXT_GEN_COMMAND_T6:
1669                         data->T6_reportid = min_id;
1670                         data->T6_address = object->start_address;
1671                         break;
1672                 case MXT_GEN_POWER_T7:
1673                         data->T7_address = object->start_address;
1674                         break;
1675                 case MXT_TOUCH_MULTI_T9:
1676                         data->multitouch = MXT_TOUCH_MULTI_T9;
1677                         data->T9_reportid_min = min_id;
1678                         data->T9_reportid_max = max_id;
1679                         data->num_touchids = object->num_report_ids
1680                                                 * mxt_obj_instances(object);
1681                         break;
1682                 case MXT_SPT_MESSAGECOUNT_T44:
1683                         data->T44_address = object->start_address;
1684                         break;
1685                 case MXT_SPT_GPIOPWM_T19:
1686                         data->T19_reportid = min_id;
1687                         break;
1688                 case MXT_TOUCH_MULTITOUCHSCREEN_T100:
1689                         data->multitouch = MXT_TOUCH_MULTITOUCHSCREEN_T100;
1690                         data->T100_reportid_min = min_id;
1691                         data->T100_reportid_max = max_id;
1692                         /* first two report IDs reserved */
1693                         data->num_touchids = object->num_report_ids - 2;
1694                         break;
1695                 }
1696
1697                 end_address = object->start_address
1698                         + mxt_obj_size(object) * mxt_obj_instances(object) - 1;
1699
1700                 if (end_address >= data->mem_size)
1701                         data->mem_size = end_address + 1;
1702         }
1703
1704         /* Store maximum reportid */
1705         data->max_reportid = reportid;
1706
1707         /* If T44 exists, T5 position has to be directly after */
1708         if (data->T44_address && (data->T5_address != data->T44_address + 1)) {
1709                 dev_err(&client->dev, "Invalid T44 position\n");
1710                 error = -EINVAL;
1711                 goto free_object_table;
1712         }
1713
1714         data->msg_buf = kcalloc(data->max_reportid,
1715                                 data->T5_msg_size, GFP_KERNEL);
1716         if (!data->msg_buf) {
1717                 dev_err(&client->dev, "Failed to allocate message buffer\n");
1718                 error = -ENOMEM;
1719                 goto free_object_table;
1720         }
1721
1722         data->object_table = object_table;
1723
1724         return 0;
1725
1726 free_object_table:
1727         mxt_free_object_table(data);
1728         return error;
1729 }
1730
1731 static int mxt_read_t9_resolution(struct mxt_data *data)
1732 {
1733         struct i2c_client *client = data->client;
1734         int error;
1735         struct t9_range range;
1736         unsigned char orient;
1737         struct mxt_object *object;
1738
1739         object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
1740         if (!object)
1741                 return -EINVAL;
1742
1743         error = __mxt_read_reg(client,
1744                                object->start_address + MXT_T9_XSIZE,
1745                                sizeof(data->xsize), &data->xsize);
1746         if (error)
1747                 return error;
1748
1749         error = __mxt_read_reg(client,
1750                                object->start_address + MXT_T9_YSIZE,
1751                                sizeof(data->ysize), &data->ysize);
1752         if (error)
1753                 return error;
1754
1755         error = __mxt_read_reg(client,
1756                                object->start_address + MXT_T9_RANGE,
1757                                sizeof(range), &range);
1758         if (error)
1759                 return error;
1760
1761         data->max_x = get_unaligned_le16(&range.x);
1762         data->max_y = get_unaligned_le16(&range.y);
1763
1764         error =  __mxt_read_reg(client,
1765                                 object->start_address + MXT_T9_ORIENT,
1766                                 1, &orient);
1767         if (error)
1768                 return error;
1769
1770         data->xy_switch = orient & MXT_T9_ORIENT_SWITCH;
1771         data->invertx = orient & MXT_T9_ORIENT_INVERTX;
1772         data->inverty = orient & MXT_T9_ORIENT_INVERTY;
1773
1774         return 0;
1775 }
1776
1777 static int mxt_read_t100_config(struct mxt_data *data)
1778 {
1779         struct i2c_client *client = data->client;
1780         int error;
1781         struct mxt_object *object;
1782         u16 range_x, range_y;
1783         u8 cfg, tchaux;
1784         u8 aux;
1785
1786         object = mxt_get_object(data, MXT_TOUCH_MULTITOUCHSCREEN_T100);
1787         if (!object)
1788                 return -EINVAL;
1789
1790         /* read touchscreen dimensions */
1791         error = __mxt_read_reg(client,
1792                                object->start_address + MXT_T100_XRANGE,
1793                                sizeof(range_x), &range_x);
1794         if (error)
1795                 return error;
1796
1797         data->max_x = get_unaligned_le16(&range_x);
1798
1799         error = __mxt_read_reg(client,
1800                                object->start_address + MXT_T100_YRANGE,
1801                                sizeof(range_y), &range_y);
1802         if (error)
1803                 return error;
1804
1805         data->max_y = get_unaligned_le16(&range_y);
1806
1807         error = __mxt_read_reg(client,
1808                                object->start_address + MXT_T100_XSIZE,
1809                                sizeof(data->xsize), &data->xsize);
1810         if (error)
1811                 return error;
1812
1813         error = __mxt_read_reg(client,
1814                                object->start_address + MXT_T100_YSIZE,
1815                                sizeof(data->ysize), &data->ysize);
1816         if (error)
1817                 return error;
1818
1819         /* read orientation config */
1820         error =  __mxt_read_reg(client,
1821                                 object->start_address + MXT_T100_CFG1,
1822                                 1, &cfg);
1823         if (error)
1824                 return error;
1825
1826         data->xy_switch = cfg & MXT_T100_CFG_SWITCHXY;
1827         data->invertx = cfg & MXT_T100_CFG_INVERTX;
1828         data->inverty = cfg & MXT_T100_CFG_INVERTY;
1829
1830         /* allocate aux bytes */
1831         error =  __mxt_read_reg(client,
1832                                 object->start_address + MXT_T100_TCHAUX,
1833                                 1, &tchaux);
1834         if (error)
1835                 return error;
1836
1837         aux = 6;
1838
1839         if (tchaux & MXT_T100_TCHAUX_VECT)
1840                 data->t100_aux_vect = aux++;
1841
1842         if (tchaux & MXT_T100_TCHAUX_AMPL)
1843                 data->t100_aux_ampl = aux++;
1844
1845         if (tchaux & MXT_T100_TCHAUX_AREA)
1846                 data->t100_aux_area = aux++;
1847
1848         dev_dbg(&client->dev,
1849                 "T100 aux mappings vect:%u ampl:%u area:%u\n",
1850                 data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area);
1851
1852         return 0;
1853 }
1854
1855 static int mxt_input_open(struct input_dev *dev);
1856 static void mxt_input_close(struct input_dev *dev);
1857
1858 static void mxt_set_up_as_touchpad(struct input_dev *input_dev,
1859                                    struct mxt_data *data)
1860 {
1861         const struct mxt_platform_data *pdata = data->pdata;
1862         int i;
1863
1864         input_dev->name = "Atmel maXTouch Touchpad";
1865
1866         __set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);
1867
1868         input_abs_set_res(input_dev, ABS_X, MXT_PIXELS_PER_MM);
1869         input_abs_set_res(input_dev, ABS_Y, MXT_PIXELS_PER_MM);
1870         input_abs_set_res(input_dev, ABS_MT_POSITION_X,
1871                           MXT_PIXELS_PER_MM);
1872         input_abs_set_res(input_dev, ABS_MT_POSITION_Y,
1873                           MXT_PIXELS_PER_MM);
1874
1875         for (i = 0; i < pdata->t19_num_keys; i++)
1876                 if (pdata->t19_keymap[i] != KEY_RESERVED)
1877                         input_set_capability(input_dev, EV_KEY,
1878                                              pdata->t19_keymap[i]);
1879 }
1880
1881 static int mxt_initialize_input_device(struct mxt_data *data)
1882 {
1883         const struct mxt_platform_data *pdata = data->pdata;
1884         struct device *dev = &data->client->dev;
1885         struct input_dev *input_dev;
1886         int error;
1887         unsigned int num_mt_slots;
1888         unsigned int mt_flags = 0;
1889
1890         switch (data->multitouch) {
1891         case MXT_TOUCH_MULTI_T9:
1892                 num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
1893                 error = mxt_read_t9_resolution(data);
1894                 if (error)
1895                         dev_warn(dev, "Failed to initialize T9 resolution\n");
1896                 break;
1897
1898         case MXT_TOUCH_MULTITOUCHSCREEN_T100:
1899                 num_mt_slots = data->num_touchids;
1900                 error = mxt_read_t100_config(data);
1901                 if (error)
1902                         dev_warn(dev, "Failed to read T100 config\n");
1903                 break;
1904
1905         default:
1906                 dev_err(dev, "Invalid multitouch object\n");
1907                 return -EINVAL;
1908         }
1909
1910         /* Handle default values and orientation switch */
1911         if (data->max_x == 0)
1912                 data->max_x = 1023;
1913
1914         if (data->max_y == 0)
1915                 data->max_y = 1023;
1916
1917         if (data->xy_switch)
1918                 swap(data->max_x, data->max_y);
1919
1920         dev_info(dev, "Touchscreen size X%uY%u\n", data->max_x, data->max_y);
1921
1922         /* Register input device */
1923         input_dev = input_allocate_device();
1924         if (!input_dev) {
1925                 dev_err(dev, "Failed to allocate memory\n");
1926                 return -ENOMEM;
1927         }
1928
1929         input_dev->name = "Atmel maXTouch Touchscreen";
1930         input_dev->phys = data->phys;
1931         input_dev->id.bustype = BUS_I2C;
1932         input_dev->dev.parent = dev;
1933         input_dev->open = mxt_input_open;
1934         input_dev->close = mxt_input_close;
1935
1936         input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
1937
1938         /* For single touch */
1939         input_set_abs_params(input_dev, ABS_X, 0, data->max_x, 0, 0);
1940         input_set_abs_params(input_dev, ABS_Y, 0, data->max_y, 0, 0);
1941
1942         if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
1943             (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
1944              data->t100_aux_ampl)) {
1945                 input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
1946         }
1947
1948         /* If device has buttons we assume it is a touchpad */
1949         if (pdata->t19_num_keys) {
1950                 mxt_set_up_as_touchpad(input_dev, data);
1951                 mt_flags |= INPUT_MT_POINTER;
1952         } else {
1953                 mt_flags |= INPUT_MT_DIRECT;
1954         }
1955
1956         /* For multi touch */
1957         error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags);
1958         if (error) {
1959                 dev_err(dev, "Error %d initialising slots\n", error);
1960                 goto err_free_mem;
1961         }
1962
1963         if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100) {
1964                 input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE,
1965                                      0, MT_TOOL_MAX, 0, 0);
1966                 input_set_abs_params(input_dev, ABS_MT_DISTANCE,
1967                                      MXT_DISTANCE_ACTIVE_TOUCH,
1968                                      MXT_DISTANCE_HOVERING,
1969                                      0, 0);
1970         }
1971
1972         input_set_abs_params(input_dev, ABS_MT_POSITION_X,
1973                              0, data->max_x, 0, 0);
1974         input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
1975                              0, data->max_y, 0, 0);
1976
1977         if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
1978             (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
1979              data->t100_aux_area)) {
1980                 input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
1981                                      0, MXT_MAX_AREA, 0, 0);
1982         }
1983
1984         if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
1985             (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
1986              data->t100_aux_ampl)) {
1987                 input_set_abs_params(input_dev, ABS_MT_PRESSURE,
1988                                      0, 255, 0, 0);
1989         }
1990
1991         if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
1992             data->t100_aux_vect) {
1993                 input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
1994                                      0, 255, 0, 0);
1995         }
1996
1997         if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
1998             data->t100_aux_ampl) {
1999                 input_set_abs_params(input_dev, ABS_MT_PRESSURE,
2000                                      0, 255, 0, 0);
2001         }
2002
2003         if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2004             data->t100_aux_vect) {
2005                 input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
2006                                      0, 255, 0, 0);
2007         }
2008
2009         input_set_drvdata(input_dev, data);
2010
2011         error = input_register_device(input_dev);
2012         if (error) {
2013                 dev_err(dev, "Error %d registering input device\n", error);
2014                 goto err_free_mem;
2015         }
2016
2017         data->input_dev = input_dev;
2018
2019         return 0;
2020
2021 err_free_mem:
2022         input_free_device(input_dev);
2023         return error;
2024 }
2025
2026 static int mxt_configure_objects(struct mxt_data *data,
2027                                  const struct firmware *cfg);
2028
2029 static void mxt_config_cb(const struct firmware *cfg, void *ctx)
2030 {
2031         mxt_configure_objects(ctx, cfg);
2032         release_firmware(cfg);
2033 }
2034
2035 static int mxt_initialize(struct mxt_data *data)
2036 {
2037         struct i2c_client *client = data->client;
2038         int recovery_attempts = 0;
2039         int error;
2040
2041         while (1) {
2042                 error = mxt_get_info(data);
2043                 if (!error)
2044                         break;
2045
2046                 /* Check bootloader state */
2047                 error = mxt_probe_bootloader(data, false);
2048                 if (error) {
2049                         dev_info(&client->dev, "Trying alternate bootloader address\n");
2050                         error = mxt_probe_bootloader(data, true);
2051                         if (error) {
2052                                 /* Chip is not in appmode or bootloader mode */
2053                                 return error;
2054                         }
2055                 }
2056
2057                 /* OK, we are in bootloader, see if we can recover */
2058                 if (++recovery_attempts > 1) {
2059                         dev_err(&client->dev, "Could not recover from bootloader mode\n");
2060                         /*
2061                          * We can reflash from this state, so do not
2062                          * abort initialization.
2063                          */
2064                         data->in_bootloader = true;
2065                         return 0;
2066                 }
2067
2068                 /* Attempt to exit bootloader into app mode */
2069                 mxt_send_bootloader_cmd(data, false);
2070                 msleep(MXT_FW_RESET_TIME);
2071         }
2072
2073         /* Get object table information */
2074         error = mxt_get_object_table(data);
2075         if (error) {
2076                 dev_err(&client->dev, "Error %d reading object table\n", error);
2077                 return error;
2078         }
2079
2080         error = mxt_acquire_irq(data);
2081         if (error)
2082                 goto err_free_object_table;
2083
2084         error = request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME,
2085                                         &client->dev, GFP_KERNEL, data,
2086                                         mxt_config_cb);
2087         if (error) {
2088                 dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
2089                         error);
2090                 goto err_free_object_table;
2091         }
2092
2093         return 0;
2094
2095 err_free_object_table:
2096         mxt_free_object_table(data);
2097         return error;
2098 }
2099
2100 static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep)
2101 {
2102         struct device *dev = &data->client->dev;
2103         int error;
2104         struct t7_config *new_config;
2105         struct t7_config deepsleep = { .active = 0, .idle = 0 };
2106
2107         if (sleep == MXT_POWER_CFG_DEEPSLEEP)
2108                 new_config = &deepsleep;
2109         else
2110                 new_config = &data->t7_cfg;
2111
2112         error = __mxt_write_reg(data->client, data->T7_address,
2113                                 sizeof(data->t7_cfg), new_config);
2114         if (error)
2115                 return error;
2116
2117         dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n",
2118                 new_config->active, new_config->idle);
2119
2120         return 0;
2121 }
2122
2123 static int mxt_init_t7_power_cfg(struct mxt_data *data)
2124 {
2125         struct device *dev = &data->client->dev;
2126         int error;
2127         bool retry = false;
2128
2129 recheck:
2130         error = __mxt_read_reg(data->client, data->T7_address,
2131                                 sizeof(data->t7_cfg), &data->t7_cfg);
2132         if (error)
2133                 return error;
2134
2135         if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) {
2136                 if (!retry) {
2137                         dev_dbg(dev, "T7 cfg zero, resetting\n");
2138                         mxt_soft_reset(data);
2139                         retry = true;
2140                         goto recheck;
2141                 } else {
2142                         dev_dbg(dev, "T7 cfg zero after reset, overriding\n");
2143                         data->t7_cfg.active = 20;
2144                         data->t7_cfg.idle = 100;
2145                         return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
2146                 }
2147         }
2148
2149         dev_dbg(dev, "Initialized power cfg: ACTV %d, IDLE %d\n",
2150                 data->t7_cfg.active, data->t7_cfg.idle);
2151         return 0;
2152 }
2153
2154 #ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
2155 static u16 mxt_get_debug_value(struct mxt_data *data, unsigned int x,
2156                                unsigned int y)
2157 {
2158         struct mxt_info *info = &data->info;
2159         struct mxt_dbg *dbg = &data->dbg;
2160         unsigned int ofs, page;
2161         unsigned int col = 0;
2162         unsigned int col_width;
2163
2164         if (info->family_id == MXT_FAMILY_1386) {
2165                 col_width = info->matrix_ysize / MXT1386_COLUMNS;
2166                 col = y / col_width;
2167                 y = y % col_width;
2168         } else {
2169                 col_width = info->matrix_ysize;
2170         }
2171
2172         ofs = (y + (x * col_width)) * sizeof(u16);
2173         page = ofs / MXT_DIAGNOSTIC_SIZE;
2174         ofs %= MXT_DIAGNOSTIC_SIZE;
2175
2176         if (info->family_id == MXT_FAMILY_1386)
2177                 page += col * MXT1386_PAGES_PER_COLUMN;
2178
2179         return get_unaligned_le16(&dbg->t37_buf[page].data[ofs]);
2180 }
2181
2182 static int mxt_convert_debug_pages(struct mxt_data *data, u16 *outbuf)
2183 {
2184         struct mxt_dbg *dbg = &data->dbg;
2185         unsigned int x = 0;
2186         unsigned int y = 0;
2187         unsigned int i, rx, ry;
2188
2189         for (i = 0; i < dbg->t37_nodes; i++) {
2190                 /* Handle orientation */
2191                 rx = data->xy_switch ? y : x;
2192                 ry = data->xy_switch ? x : y;
2193                 rx = data->invertx ? (data->xsize - 1 - rx) : rx;
2194                 ry = data->inverty ? (data->ysize - 1 - ry) : ry;
2195
2196                 outbuf[i] = mxt_get_debug_value(data, rx, ry);
2197
2198                 /* Next value */
2199                 if (++x >= (data->xy_switch ? data->ysize : data->xsize)) {
2200                         x = 0;
2201                         y++;
2202                 }
2203         }
2204
2205         return 0;
2206 }
2207
2208 static int mxt_read_diagnostic_debug(struct mxt_data *data, u8 mode,
2209                                      u16 *outbuf)
2210 {
2211         struct mxt_dbg *dbg = &data->dbg;
2212         int retries = 0;
2213         int page;
2214         int ret;
2215         u8 cmd = mode;
2216         struct t37_debug *p;
2217         u8 cmd_poll;
2218
2219         for (page = 0; page < dbg->t37_pages; page++) {
2220                 p = dbg->t37_buf + page;
2221
2222                 ret = mxt_write_reg(data->client, dbg->diag_cmd_address,
2223                                     cmd);
2224                 if (ret)
2225                         return ret;
2226
2227                 retries = 0;
2228                 msleep(20);
2229 wait_cmd:
2230                 /* Read back command byte */
2231                 ret = __mxt_read_reg(data->client, dbg->diag_cmd_address,
2232                                      sizeof(cmd_poll), &cmd_poll);
2233                 if (ret)
2234                         return ret;
2235
2236                 /* Field is cleared once the command has been processed */
2237                 if (cmd_poll) {
2238                         if (retries++ > 100)
2239                                 return -EINVAL;
2240
2241                         msleep(20);
2242                         goto wait_cmd;
2243                 }
2244
2245                 /* Read T37 page */
2246                 ret = __mxt_read_reg(data->client, dbg->t37_address,
2247                                      sizeof(struct t37_debug), p);
2248                 if (ret)
2249                         return ret;
2250
2251                 if (p->mode != mode || p->page != page) {
2252                         dev_err(&data->client->dev, "T37 page mismatch\n");
2253                         return -EINVAL;
2254                 }
2255
2256                 dev_dbg(&data->client->dev, "%s page:%d retries:%d\n",
2257                         __func__, page, retries);
2258
2259                 /* For remaining pages, write PAGEUP rather than mode */
2260                 cmd = MXT_DIAGNOSTIC_PAGEUP;
2261         }
2262
2263         return mxt_convert_debug_pages(data, outbuf);
2264 }
2265
2266 static int mxt_queue_setup(struct vb2_queue *q,
2267                        unsigned int *nbuffers, unsigned int *nplanes,
2268                        unsigned int sizes[], struct device *alloc_devs[])
2269 {
2270         struct mxt_data *data = q->drv_priv;
2271         size_t size = data->dbg.t37_nodes * sizeof(u16);
2272
2273         if (*nplanes)
2274                 return sizes[0] < size ? -EINVAL : 0;
2275
2276         *nplanes = 1;
2277         sizes[0] = size;
2278
2279         return 0;
2280 }
2281
2282 static void mxt_buffer_queue(struct vb2_buffer *vb)
2283 {
2284         struct mxt_data *data = vb2_get_drv_priv(vb->vb2_queue);
2285         u16 *ptr;
2286         int ret;
2287         u8 mode;
2288
2289         ptr = vb2_plane_vaddr(vb, 0);
2290         if (!ptr) {
2291                 dev_err(&data->client->dev, "Error acquiring frame ptr\n");
2292                 goto fault;
2293         }
2294
2295         switch (data->dbg.input) {
2296         case MXT_V4L_INPUT_DELTAS:
2297         default:
2298                 mode = MXT_DIAGNOSTIC_DELTAS;
2299                 break;
2300
2301         case MXT_V4L_INPUT_REFS:
2302                 mode = MXT_DIAGNOSTIC_REFS;
2303                 break;
2304         }
2305
2306         ret = mxt_read_diagnostic_debug(data, mode, ptr);
2307         if (ret)
2308                 goto fault;
2309
2310         vb2_set_plane_payload(vb, 0, data->dbg.t37_nodes * sizeof(u16));
2311         vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
2312         return;
2313
2314 fault:
2315         vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
2316 }
2317
2318 /* V4L2 structures */
2319 static const struct vb2_ops mxt_queue_ops = {
2320         .queue_setup            = mxt_queue_setup,
2321         .buf_queue              = mxt_buffer_queue,
2322         .wait_prepare           = vb2_ops_wait_prepare,
2323         .wait_finish            = vb2_ops_wait_finish,
2324 };
2325
2326 static const struct vb2_queue mxt_queue = {
2327         .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
2328         .io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ,
2329         .buf_struct_size = sizeof(struct mxt_vb2_buffer),
2330         .ops = &mxt_queue_ops,
2331         .mem_ops = &vb2_vmalloc_memops,
2332         .timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
2333         .min_buffers_needed = 1,
2334 };
2335
2336 static int mxt_vidioc_querycap(struct file *file, void *priv,
2337                                  struct v4l2_capability *cap)
2338 {
2339         struct mxt_data *data = video_drvdata(file);
2340
2341         strlcpy(cap->driver, "atmel_mxt_ts", sizeof(cap->driver));
2342         strlcpy(cap->card, "atmel_mxt_ts touch", sizeof(cap->card));
2343         snprintf(cap->bus_info, sizeof(cap->bus_info),
2344                  "I2C:%s", dev_name(&data->client->dev));
2345         return 0;
2346 }
2347
2348 static int mxt_vidioc_enum_input(struct file *file, void *priv,
2349                                    struct v4l2_input *i)
2350 {
2351         if (i->index >= MXT_V4L_INPUT_MAX)
2352                 return -EINVAL;
2353
2354         i->type = V4L2_INPUT_TYPE_TOUCH;
2355
2356         switch (i->index) {
2357         case MXT_V4L_INPUT_REFS:
2358                 strlcpy(i->name, "Mutual Capacitance References",
2359                         sizeof(i->name));
2360                 break;
2361         case MXT_V4L_INPUT_DELTAS:
2362                 strlcpy(i->name, "Mutual Capacitance Deltas", sizeof(i->name));
2363                 break;
2364         }
2365
2366         return 0;
2367 }
2368
2369 static int mxt_set_input(struct mxt_data *data, unsigned int i)
2370 {
2371         struct v4l2_pix_format *f = &data->dbg.format;
2372
2373         if (i >= MXT_V4L_INPUT_MAX)
2374                 return -EINVAL;
2375
2376         if (i == MXT_V4L_INPUT_DELTAS)
2377                 f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
2378         else
2379                 f->pixelformat = V4L2_TCH_FMT_TU16;
2380
2381         f->width = data->xy_switch ? data->ysize : data->xsize;
2382         f->height = data->xy_switch ? data->xsize : data->ysize;
2383         f->field = V4L2_FIELD_NONE;
2384         f->colorspace = V4L2_COLORSPACE_RAW;
2385         f->bytesperline = f->width * sizeof(u16);
2386         f->sizeimage = f->width * f->height * sizeof(u16);
2387
2388         data->dbg.input = i;
2389
2390         return 0;
2391 }
2392
2393 static int mxt_vidioc_s_input(struct file *file, void *priv, unsigned int i)
2394 {
2395         return mxt_set_input(video_drvdata(file), i);
2396 }
2397
2398 static int mxt_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
2399 {
2400         struct mxt_data *data = video_drvdata(file);
2401
2402         *i = data->dbg.input;
2403
2404         return 0;
2405 }
2406
2407 static int mxt_vidioc_fmt(struct file *file, void *priv, struct v4l2_format *f)
2408 {
2409         struct mxt_data *data = video_drvdata(file);
2410
2411         f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2412         f->fmt.pix = data->dbg.format;
2413
2414         return 0;
2415 }
2416
2417 static int mxt_vidioc_enum_fmt(struct file *file, void *priv,
2418                                  struct v4l2_fmtdesc *fmt)
2419 {
2420         if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2421                 return -EINVAL;
2422
2423         switch (fmt->index) {
2424         case 0:
2425                 fmt->pixelformat = V4L2_TCH_FMT_TU16;
2426                 break;
2427
2428         case 1:
2429                 fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
2430                 break;
2431
2432         default:
2433                 return -EINVAL;
2434         }
2435
2436         return 0;
2437 }
2438
2439 static int mxt_vidioc_g_parm(struct file *file, void *fh,
2440                              struct v4l2_streamparm *a)
2441 {
2442         if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2443                 return -EINVAL;
2444
2445         a->parm.capture.readbuffers = 1;
2446         a->parm.capture.timeperframe.numerator = 1;
2447         a->parm.capture.timeperframe.denominator = 10;
2448         return 0;
2449 }
2450
2451 static const struct v4l2_ioctl_ops mxt_video_ioctl_ops = {
2452         .vidioc_querycap        = mxt_vidioc_querycap,
2453
2454         .vidioc_enum_fmt_vid_cap = mxt_vidioc_enum_fmt,
2455         .vidioc_s_fmt_vid_cap   = mxt_vidioc_fmt,
2456         .vidioc_g_fmt_vid_cap   = mxt_vidioc_fmt,
2457         .vidioc_try_fmt_vid_cap = mxt_vidioc_fmt,
2458         .vidioc_g_parm          = mxt_vidioc_g_parm,
2459
2460         .vidioc_enum_input      = mxt_vidioc_enum_input,
2461         .vidioc_g_input         = mxt_vidioc_g_input,
2462         .vidioc_s_input         = mxt_vidioc_s_input,
2463
2464         .vidioc_reqbufs         = vb2_ioctl_reqbufs,
2465         .vidioc_create_bufs     = vb2_ioctl_create_bufs,
2466         .vidioc_querybuf        = vb2_ioctl_querybuf,
2467         .vidioc_qbuf            = vb2_ioctl_qbuf,
2468         .vidioc_dqbuf           = vb2_ioctl_dqbuf,
2469         .vidioc_expbuf          = vb2_ioctl_expbuf,
2470
2471         .vidioc_streamon        = vb2_ioctl_streamon,
2472         .vidioc_streamoff       = vb2_ioctl_streamoff,
2473 };
2474
2475 static const struct video_device mxt_video_device = {
2476         .name = "Atmel maxTouch",
2477         .fops = &mxt_video_fops,
2478         .ioctl_ops = &mxt_video_ioctl_ops,
2479         .release = video_device_release_empty,
2480         .device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
2481                        V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
2482 };
2483
2484 static void mxt_debug_init(struct mxt_data *data)
2485 {
2486         struct mxt_info *info = &data->info;
2487         struct mxt_dbg *dbg = &data->dbg;
2488         struct mxt_object *object;
2489         int error;
2490
2491         object = mxt_get_object(data, MXT_GEN_COMMAND_T6);
2492         if (!object)
2493                 goto error;
2494
2495         dbg->diag_cmd_address = object->start_address + MXT_COMMAND_DIAGNOSTIC;
2496
2497         object = mxt_get_object(data, MXT_DEBUG_DIAGNOSTIC_T37);
2498         if (!object)
2499                 goto error;
2500
2501         if (mxt_obj_size(object) != sizeof(struct t37_debug)) {
2502                 dev_warn(&data->client->dev, "Bad T37 size");
2503                 goto error;
2504         }
2505
2506         dbg->t37_address = object->start_address;
2507
2508         /* Calculate size of data and allocate buffer */
2509         dbg->t37_nodes = data->xsize * data->ysize;
2510
2511         if (info->family_id == MXT_FAMILY_1386)
2512                 dbg->t37_pages = MXT1386_COLUMNS * MXT1386_PAGES_PER_COLUMN;
2513         else
2514                 dbg->t37_pages = DIV_ROUND_UP(data->xsize *
2515                                               info->matrix_ysize *
2516                                               sizeof(u16),
2517                                               sizeof(dbg->t37_buf->data));
2518
2519         dbg->t37_buf = devm_kmalloc_array(&data->client->dev, dbg->t37_pages,
2520                                           sizeof(struct t37_debug), GFP_KERNEL);
2521         if (!dbg->t37_buf)
2522                 goto error;
2523
2524         /* init channel to zero */
2525         mxt_set_input(data, 0);
2526
2527         /* register video device */
2528         snprintf(dbg->v4l2.name, sizeof(dbg->v4l2.name), "%s", "atmel_mxt_ts");
2529         error = v4l2_device_register(&data->client->dev, &dbg->v4l2);
2530         if (error)
2531                 goto error;
2532
2533         /* initialize the queue */
2534         mutex_init(&dbg->lock);
2535         dbg->queue = mxt_queue;
2536         dbg->queue.drv_priv = data;
2537         dbg->queue.lock = &dbg->lock;
2538         dbg->queue.dev = &data->client->dev;
2539
2540         error = vb2_queue_init(&dbg->queue);
2541         if (error)
2542                 goto error_unreg_v4l2;
2543
2544         dbg->vdev = mxt_video_device;
2545         dbg->vdev.v4l2_dev = &dbg->v4l2;
2546         dbg->vdev.lock = &dbg->lock;
2547         dbg->vdev.vfl_dir = VFL_DIR_RX;
2548         dbg->vdev.queue = &dbg->queue;
2549         video_set_drvdata(&dbg->vdev, data);
2550
2551         error = video_register_device(&dbg->vdev, VFL_TYPE_TOUCH, -1);
2552         if (error)
2553                 goto error_unreg_v4l2;
2554
2555         return;
2556
2557 error_unreg_v4l2:
2558         v4l2_device_unregister(&dbg->v4l2);
2559 error:
2560         dev_warn(&data->client->dev, "Error initializing T37\n");
2561 }
2562 #else
2563 static void mxt_debug_init(struct mxt_data *data)
2564 {
2565 }
2566 #endif
2567
2568 static int mxt_configure_objects(struct mxt_data *data,
2569                                  const struct firmware *cfg)
2570 {
2571         struct device *dev = &data->client->dev;
2572         struct mxt_info *info = &data->info;
2573         int error;
2574
2575         error = mxt_init_t7_power_cfg(data);
2576         if (error) {
2577                 dev_err(dev, "Failed to initialize power cfg\n");
2578                 return error;
2579         }
2580
2581         if (cfg) {
2582                 error = mxt_update_cfg(data, cfg);
2583                 if (error)
2584                         dev_warn(dev, "Error %d updating config\n", error);
2585         }
2586
2587         if (data->multitouch) {
2588                 error = mxt_initialize_input_device(data);
2589                 if (error)
2590                         return error;
2591         } else {
2592                 dev_warn(dev, "No touch object detected\n");
2593         }
2594
2595         mxt_debug_init(data);
2596
2597         dev_info(dev,
2598                  "Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n",
2599                  info->family_id, info->variant_id, info->version >> 4,
2600                  info->version & 0xf, info->build, info->object_num);
2601
2602         return 0;
2603 }
2604
2605 /* Firmware Version is returned as Major.Minor.Build */
2606 static ssize_t mxt_fw_version_show(struct device *dev,
2607                                    struct device_attribute *attr, char *buf)
2608 {
2609         struct mxt_data *data = dev_get_drvdata(dev);
2610         struct mxt_info *info = &data->info;
2611         return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n",
2612                          info->version >> 4, info->version & 0xf, info->build);
2613 }
2614
2615 /* Hardware Version is returned as FamilyID.VariantID */
2616 static ssize_t mxt_hw_version_show(struct device *dev,
2617                                    struct device_attribute *attr, char *buf)
2618 {
2619         struct mxt_data *data = dev_get_drvdata(dev);
2620         struct mxt_info *info = &data->info;
2621         return scnprintf(buf, PAGE_SIZE, "%u.%u\n",
2622                          info->family_id, info->variant_id);
2623 }
2624
2625 static ssize_t mxt_show_instance(char *buf, int count,
2626                                  struct mxt_object *object, int instance,
2627                                  const u8 *val)
2628 {
2629         int i;
2630
2631         if (mxt_obj_instances(object) > 1)
2632                 count += scnprintf(buf + count, PAGE_SIZE - count,
2633                                    "Instance %u\n", instance);
2634
2635         for (i = 0; i < mxt_obj_size(object); i++)
2636                 count += scnprintf(buf + count, PAGE_SIZE - count,
2637                                 "\t[%2u]: %02x (%d)\n", i, val[i], val[i]);
2638         count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
2639
2640         return count;
2641 }
2642
2643 static ssize_t mxt_object_show(struct device *dev,
2644                                     struct device_attribute *attr, char *buf)
2645 {
2646         struct mxt_data *data = dev_get_drvdata(dev);
2647         struct mxt_object *object;
2648         int count = 0;
2649         int i, j;
2650         int error;
2651         u8 *obuf;
2652
2653         /* Pre-allocate buffer large enough to hold max sized object. */
2654         obuf = kmalloc(256, GFP_KERNEL);
2655         if (!obuf)
2656                 return -ENOMEM;
2657
2658         error = 0;
2659         for (i = 0; i < data->info.object_num; i++) {
2660                 object = data->object_table + i;
2661
2662                 if (!mxt_object_readable(object->type))
2663                         continue;
2664
2665                 count += scnprintf(buf + count, PAGE_SIZE - count,
2666                                 "T%u:\n", object->type);
2667
2668                 for (j = 0; j < mxt_obj_instances(object); j++) {
2669                         u16 size = mxt_obj_size(object);
2670                         u16 addr = object->start_address + j * size;
2671
2672                         error = __mxt_read_reg(data->client, addr, size, obuf);
2673                         if (error)
2674                                 goto done;
2675
2676                         count = mxt_show_instance(buf, count, object, j, obuf);
2677                 }
2678         }
2679
2680 done:
2681         kfree(obuf);
2682         return error ?: count;
2683 }
2684
2685 static int mxt_check_firmware_format(struct device *dev,
2686                                      const struct firmware *fw)
2687 {
2688         unsigned int pos = 0;
2689         char c;
2690
2691         while (pos < fw->size) {
2692                 c = *(fw->data + pos);
2693
2694                 if (c < '0' || (c > '9' && c < 'A') || c > 'F')
2695                         return 0;
2696
2697                 pos++;
2698         }
2699
2700         /*
2701          * To convert file try:
2702          * xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw
2703          */
2704         dev_err(dev, "Aborting: firmware file must be in binary format\n");
2705
2706         return -EINVAL;
2707 }
2708
2709 static int mxt_load_fw(struct device *dev, const char *fn)
2710 {
2711         struct mxt_data *data = dev_get_drvdata(dev);
2712         const struct firmware *fw = NULL;
2713         unsigned int frame_size;
2714         unsigned int pos = 0;
2715         unsigned int retry = 0;
2716         unsigned int frame = 0;
2717         int ret;
2718
2719         ret = request_firmware(&fw, fn, dev);
2720         if (ret) {
2721                 dev_err(dev, "Unable to open firmware %s\n", fn);
2722                 return ret;
2723         }
2724
2725         /* Check for incorrect enc file */
2726         ret = mxt_check_firmware_format(dev, fw);
2727         if (ret)
2728                 goto release_firmware;
2729
2730         if (!data->in_bootloader) {
2731                 /* Change to the bootloader mode */
2732                 data->in_bootloader = true;
2733
2734                 ret = mxt_t6_command(data, MXT_COMMAND_RESET,
2735                                      MXT_BOOT_VALUE, false);
2736                 if (ret)
2737                         goto release_firmware;
2738
2739                 msleep(MXT_RESET_TIME);
2740
2741                 /* Do not need to scan since we know family ID */
2742                 ret = mxt_lookup_bootloader_address(data, 0);
2743                 if (ret)
2744                         goto release_firmware;
2745
2746                 mxt_free_input_device(data);
2747                 mxt_free_object_table(data);
2748         } else {
2749                 enable_irq(data->irq);
2750         }
2751
2752         reinit_completion(&data->bl_completion);
2753
2754         ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD, false);
2755         if (ret) {
2756                 /* Bootloader may still be unlocked from previous attempt */
2757                 ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, false);
2758                 if (ret)
2759                         goto disable_irq;
2760         } else {
2761                 dev_info(dev, "Unlocking bootloader\n");
2762
2763                 /* Unlock bootloader */
2764                 ret = mxt_send_bootloader_cmd(data, true);
2765                 if (ret)
2766                         goto disable_irq;
2767         }
2768
2769         while (pos < fw->size) {
2770                 ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, true);
2771                 if (ret)
2772                         goto disable_irq;
2773
2774                 frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
2775
2776                 /* Take account of CRC bytes */
2777                 frame_size += 2;
2778
2779                 /* Write one frame to device */
2780                 ret = mxt_bootloader_write(data, fw->data + pos, frame_size);
2781                 if (ret)
2782                         goto disable_irq;
2783
2784                 ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS, true);
2785                 if (ret) {
2786                         retry++;
2787
2788                         /* Back off by 20ms per retry */
2789                         msleep(retry * 20);
2790
2791                         if (retry > 20) {
2792                                 dev_err(dev, "Retry count exceeded\n");
2793                                 goto disable_irq;
2794                         }
2795                 } else {
2796                         retry = 0;
2797                         pos += frame_size;
2798                         frame++;
2799                 }
2800
2801                 if (frame % 50 == 0)
2802                         dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n",
2803                                 frame, pos, fw->size);
2804         }
2805
2806         /* Wait for flash. */
2807         ret = mxt_wait_for_completion(data, &data->bl_completion,
2808                                       MXT_FW_RESET_TIME);
2809         if (ret)
2810                 goto disable_irq;
2811
2812         dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos);
2813
2814         /*
2815          * Wait for device to reset. Some bootloader versions do not assert
2816          * the CHG line after bootloading has finished, so ignore potential
2817          * errors.
2818          */
2819         mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME);
2820
2821         data->in_bootloader = false;
2822
2823 disable_irq:
2824         disable_irq(data->irq);
2825 release_firmware:
2826         release_firmware(fw);
2827         return ret;
2828 }
2829
2830 static ssize_t mxt_update_fw_store(struct device *dev,
2831                                         struct device_attribute *attr,
2832                                         const char *buf, size_t count)
2833 {
2834         struct mxt_data *data = dev_get_drvdata(dev);
2835         int error;
2836
2837         error = mxt_load_fw(dev, MXT_FW_NAME);
2838         if (error) {
2839                 dev_err(dev, "The firmware update failed(%d)\n", error);
2840                 count = error;
2841         } else {
2842                 dev_info(dev, "The firmware update succeeded\n");
2843
2844                 error = mxt_initialize(data);
2845                 if (error)
2846                         return error;
2847         }
2848
2849         return count;
2850 }
2851
2852 static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
2853 static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
2854 static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
2855 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
2856
2857 static struct attribute *mxt_attrs[] = {
2858         &dev_attr_fw_version.attr,
2859         &dev_attr_hw_version.attr,
2860         &dev_attr_object.attr,
2861         &dev_attr_update_fw.attr,
2862         NULL
2863 };
2864
2865 static const struct attribute_group mxt_attr_group = {
2866         .attrs = mxt_attrs,
2867 };
2868
2869 static void mxt_start(struct mxt_data *data)
2870 {
2871         switch (data->pdata->suspend_mode) {
2872         case MXT_SUSPEND_T9_CTRL:
2873                 mxt_soft_reset(data);
2874
2875                 /* Touch enable */
2876                 /* 0x83 = SCANEN | RPTEN | ENABLE */
2877                 mxt_write_object(data,
2878                                 MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
2879                 break;
2880
2881         case MXT_SUSPEND_DEEP_SLEEP:
2882         default:
2883                 mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
2884
2885                 /* Recalibrate since chip has been in deep sleep */
2886                 mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
2887                 break;
2888         }
2889
2890 }
2891
2892 static void mxt_stop(struct mxt_data *data)
2893 {
2894         switch (data->pdata->suspend_mode) {
2895         case MXT_SUSPEND_T9_CTRL:
2896                 /* Touch disable */
2897                 mxt_write_object(data,
2898                                 MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
2899                 break;
2900
2901         case MXT_SUSPEND_DEEP_SLEEP:
2902         default:
2903                 mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
2904                 break;
2905         }
2906 }
2907
2908 static int mxt_input_open(struct input_dev *dev)
2909 {
2910         struct mxt_data *data = input_get_drvdata(dev);
2911
2912         mxt_start(data);
2913
2914         return 0;
2915 }
2916
2917 static void mxt_input_close(struct input_dev *dev)
2918 {
2919         struct mxt_data *data = input_get_drvdata(dev);
2920
2921         mxt_stop(data);
2922 }
2923
2924 #ifdef CONFIG_OF
2925 static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
2926 {
2927         struct mxt_platform_data *pdata;
2928         struct device_node *np = client->dev.of_node;
2929         u32 *keymap;
2930         int proplen, ret;
2931
2932         if (!np)
2933                 return ERR_PTR(-ENOENT);
2934
2935         pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
2936         if (!pdata)
2937                 return ERR_PTR(-ENOMEM);
2938
2939         if (of_find_property(np, "linux,gpio-keymap", &proplen)) {
2940                 pdata->t19_num_keys = proplen / sizeof(u32);
2941
2942                 keymap = devm_kzalloc(&client->dev,
2943                                 pdata->t19_num_keys * sizeof(keymap[0]),
2944                                 GFP_KERNEL);
2945                 if (!keymap)
2946                         return ERR_PTR(-ENOMEM);
2947
2948                 ret = of_property_read_u32_array(np, "linux,gpio-keymap",
2949                                                  keymap, pdata->t19_num_keys);
2950                 if (ret)
2951                         dev_warn(&client->dev,
2952                                  "Couldn't read linux,gpio-keymap: %d\n", ret);
2953
2954                 pdata->t19_keymap = keymap;
2955         }
2956
2957         pdata->suspend_mode = MXT_SUSPEND_DEEP_SLEEP;
2958
2959         return pdata;
2960 }
2961 #else
2962 static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client)
2963 {
2964         return ERR_PTR(-ENOENT);
2965 }
2966 #endif
2967
2968 #ifdef CONFIG_ACPI
2969
2970 struct mxt_acpi_platform_data {
2971         const char *hid;
2972         struct mxt_platform_data pdata;
2973 };
2974
2975 static unsigned int samus_touchpad_buttons[] = {
2976         KEY_RESERVED,
2977         KEY_RESERVED,
2978         KEY_RESERVED,
2979         BTN_LEFT
2980 };
2981
2982 static struct mxt_acpi_platform_data samus_platform_data[] = {
2983         {
2984                 /* Touchpad */
2985                 .hid    = "ATML0000",
2986                 .pdata  = {
2987                         .t19_num_keys   = ARRAY_SIZE(samus_touchpad_buttons),
2988                         .t19_keymap     = samus_touchpad_buttons,
2989                 },
2990         },
2991         {
2992                 /* Touchscreen */
2993                 .hid    = "ATML0001",
2994         },
2995         { }
2996 };
2997
2998 static unsigned int chromebook_tp_buttons[] = {
2999         KEY_RESERVED,
3000         KEY_RESERVED,
3001         KEY_RESERVED,
3002         KEY_RESERVED,
3003         KEY_RESERVED,
3004         BTN_LEFT
3005 };
3006
3007 static struct mxt_acpi_platform_data chromebook_platform_data[] = {
3008         {
3009                 /* Touchpad */
3010                 .hid    = "ATML0000",
3011                 .pdata  = {
3012                         .t19_num_keys   = ARRAY_SIZE(chromebook_tp_buttons),
3013                         .t19_keymap     = chromebook_tp_buttons,
3014                 },
3015         },
3016         {
3017                 /* Touchscreen */
3018                 .hid    = "ATML0001",
3019         },
3020         { }
3021 };
3022
3023 static const struct dmi_system_id mxt_dmi_table[] = {
3024         {
3025                 /* 2015 Google Pixel */
3026                 .ident = "Chromebook Pixel 2",
3027                 .matches = {
3028                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
3029                         DMI_MATCH(DMI_PRODUCT_NAME, "Samus"),
3030                 },
3031                 .driver_data = samus_platform_data,
3032         },
3033         {
3034                 /* Other Google Chromebooks */
3035                 .ident = "Chromebook",
3036                 .matches = {
3037                         DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
3038                 },
3039                 .driver_data = chromebook_platform_data,
3040         },
3041         { }
3042 };
3043
3044 static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client)
3045 {
3046         struct acpi_device *adev;
3047         const struct dmi_system_id *system_id;
3048         const struct mxt_acpi_platform_data *acpi_pdata;
3049
3050         /*
3051          * Ignore ACPI devices representing bootloader mode.
3052          *
3053          * This is a bit of a hack: Google Chromebook BIOS creates ACPI
3054          * devices for both application and bootloader modes, but we are
3055          * interested in application mode only (if device is in bootloader
3056          * mode we'll end up switching into application anyway). So far
3057          * application mode addresses were all above 0x40, so we'll use it
3058          * as a threshold.
3059          */
3060         if (client->addr < 0x40)
3061                 return ERR_PTR(-ENXIO);
3062
3063         adev = ACPI_COMPANION(&client->dev);
3064         if (!adev)
3065                 return ERR_PTR(-ENOENT);
3066
3067         system_id = dmi_first_match(mxt_dmi_table);
3068         if (!system_id)
3069                 return ERR_PTR(-ENOENT);
3070
3071         acpi_pdata = system_id->driver_data;
3072         if (!acpi_pdata)
3073                 return ERR_PTR(-ENOENT);
3074
3075         while (acpi_pdata->hid) {
3076                 if (!strcmp(acpi_device_hid(adev), acpi_pdata->hid))
3077                         return &acpi_pdata->pdata;
3078
3079                 acpi_pdata++;
3080         }
3081
3082         return ERR_PTR(-ENOENT);
3083 }
3084 #else
3085 static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client)
3086 {
3087         return ERR_PTR(-ENOENT);
3088 }
3089 #endif
3090
3091 static const struct mxt_platform_data *
3092 mxt_get_platform_data(struct i2c_client *client)
3093 {
3094         const struct mxt_platform_data *pdata;
3095
3096         pdata = dev_get_platdata(&client->dev);
3097         if (pdata)
3098                 return pdata;
3099
3100         pdata = mxt_parse_dt(client);
3101         if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT)
3102                 return pdata;
3103
3104         pdata = mxt_parse_acpi(client);
3105         if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT)
3106                 return pdata;
3107
3108         dev_err(&client->dev, "No platform data specified\n");
3109         return ERR_PTR(-EINVAL);
3110 }
3111
3112 static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
3113 {
3114         struct mxt_data *data;
3115         const struct mxt_platform_data *pdata;
3116         int error;
3117
3118         pdata = mxt_get_platform_data(client);
3119         if (IS_ERR(pdata))
3120                 return PTR_ERR(pdata);
3121
3122         data = devm_kzalloc(&client->dev, sizeof(struct mxt_data), GFP_KERNEL);
3123         if (!data)
3124                 return -ENOMEM;
3125
3126         snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
3127                  client->adapter->nr, client->addr);
3128
3129         data->client = client;
3130         data->pdata = pdata;
3131         data->irq = client->irq;
3132         i2c_set_clientdata(client, data);
3133
3134         init_completion(&data->bl_completion);
3135         init_completion(&data->reset_completion);
3136         init_completion(&data->crc_completion);
3137
3138         data->reset_gpio = devm_gpiod_get_optional(&client->dev,
3139                                                    "reset", GPIOD_OUT_LOW);
3140         if (IS_ERR(data->reset_gpio)) {
3141                 error = PTR_ERR(data->reset_gpio);
3142                 dev_err(&client->dev, "Failed to get reset gpio: %d\n", error);
3143                 return error;
3144         }
3145
3146         error = devm_request_threaded_irq(&client->dev, client->irq,
3147                                           NULL, mxt_interrupt,
3148                                           pdata->irqflags | IRQF_ONESHOT,
3149                                           client->name, data);
3150         if (error) {
3151                 dev_err(&client->dev, "Failed to register interrupt\n");
3152                 return error;
3153         }
3154
3155         if (data->reset_gpio) {
3156                 data->in_bootloader = true;
3157                 msleep(MXT_RESET_TIME);
3158                 reinit_completion(&data->bl_completion);
3159                 gpiod_set_value(data->reset_gpio, 1);
3160                 error = mxt_wait_for_completion(data, &data->bl_completion,
3161                                                 MXT_RESET_TIMEOUT);
3162                 if (error)
3163                         return error;
3164                 data->in_bootloader = false;
3165         }
3166
3167         disable_irq(client->irq);
3168
3169         error = mxt_initialize(data);
3170         if (error)
3171                 return error;
3172
3173         error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group);
3174         if (error) {
3175                 dev_err(&client->dev, "Failure %d creating sysfs group\n",
3176                         error);
3177                 goto err_free_object;
3178         }
3179
3180         return 0;
3181
3182 err_free_object:
3183         mxt_free_input_device(data);
3184         mxt_free_object_table(data);
3185         return error;
3186 }
3187
3188 static int mxt_remove(struct i2c_client *client)
3189 {
3190         struct mxt_data *data = i2c_get_clientdata(client);
3191
3192         disable_irq(data->irq);
3193         sysfs_remove_group(&client->dev.kobj, &mxt_attr_group);
3194         mxt_free_input_device(data);
3195         mxt_free_object_table(data);
3196
3197         return 0;
3198 }
3199
3200 static int __maybe_unused mxt_suspend(struct device *dev)
3201 {
3202         struct i2c_client *client = to_i2c_client(dev);
3203         struct mxt_data *data = i2c_get_clientdata(client);
3204         struct input_dev *input_dev = data->input_dev;
3205
3206         if (!input_dev)
3207                 return 0;
3208
3209         mutex_lock(&input_dev->mutex);
3210
3211         if (input_dev->users)
3212                 mxt_stop(data);
3213
3214         mutex_unlock(&input_dev->mutex);
3215
3216         return 0;
3217 }
3218
3219 static int __maybe_unused mxt_resume(struct device *dev)
3220 {
3221         struct i2c_client *client = to_i2c_client(dev);
3222         struct mxt_data *data = i2c_get_clientdata(client);
3223         struct input_dev *input_dev = data->input_dev;
3224
3225         if (!input_dev)
3226                 return 0;
3227
3228         mutex_lock(&input_dev->mutex);
3229
3230         if (input_dev->users)
3231                 mxt_start(data);
3232
3233         mutex_unlock(&input_dev->mutex);
3234
3235         return 0;
3236 }
3237
3238 static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
3239
3240 static const struct of_device_id mxt_of_match[] = {
3241         { .compatible = "atmel,maxtouch", },
3242         {},
3243 };
3244 MODULE_DEVICE_TABLE(of, mxt_of_match);
3245
3246 #ifdef CONFIG_ACPI
3247 static const struct acpi_device_id mxt_acpi_id[] = {
3248         { "ATML0000", 0 },      /* Touchpad */
3249         { "ATML0001", 0 },      /* Touchscreen */
3250         { }
3251 };
3252 MODULE_DEVICE_TABLE(acpi, mxt_acpi_id);
3253 #endif
3254
3255 static const struct i2c_device_id mxt_id[] = {
3256         { "qt602240_ts", 0 },
3257         { "atmel_mxt_ts", 0 },
3258         { "atmel_mxt_tp", 0 },
3259         { "maxtouch", 0 },
3260         { "mXT224", 0 },
3261         { }
3262 };
3263 MODULE_DEVICE_TABLE(i2c, mxt_id);
3264
3265 static struct i2c_driver mxt_driver = {
3266         .driver = {
3267                 .name   = "atmel_mxt_ts",
3268                 .of_match_table = of_match_ptr(mxt_of_match),
3269                 .acpi_match_table = ACPI_PTR(mxt_acpi_id),
3270                 .pm     = &mxt_pm_ops,
3271         },
3272         .probe          = mxt_probe,
3273         .remove         = mxt_remove,
3274         .id_table       = mxt_id,
3275 };
3276
3277 module_i2c_driver(mxt_driver);
3278
3279 /* Module information */
3280 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
3281 MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
3282 MODULE_LICENSE("GPL");