drivers/input/mouse/elan_i2c_smbus.c

   1 /*
   2  * Elan I2C/SMBus Touchpad driver - SMBus interface
   3  *
   4  * Copyright (c) 2013 ELAN Microelectronics Corp.
   5  *
   6  * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
   7  *
   8  * Based on cyapa driver:
   9  * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  10  * copyright (c) 2011-2012 Google, Inc.
  11  *
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License version 2 as published
  14  * by the Free Software Foundation.
  15  *
  16  * Trademarks are the property of their respective owners.
  17  */
  18
  19 #include <linux/delay.h>
  20 #include <linux/i2c.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23
  24 #include "elan_i2c.h"
  25
  26 /* Elan SMbus commands */
  27 #define ETP_SMBUS_IAP_CMD               0x00
  28 #define ETP_SMBUS_ENABLE_TP             0x20
  29 #define ETP_SMBUS_SLEEP_CMD             0x21
  30 #define ETP_SMBUS_IAP_PASSWORD_WRITE    0x29
  31 #define ETP_SMBUS_IAP_PASSWORD_READ     0x80
  32 #define ETP_SMBUS_WRITE_FW_BLOCK        0x2A
  33 #define ETP_SMBUS_IAP_RESET_CMD         0x2B
  34 #define ETP_SMBUS_RANGE_CMD             0xA0
  35 #define ETP_SMBUS_FW_VERSION_CMD        0xA1
  36 #define ETP_SMBUS_XY_TRACENUM_CMD       0xA2
  37 #define ETP_SMBUS_SM_VERSION_CMD        0xA3
  38 #define ETP_SMBUS_UNIQUEID_CMD          0xA3
  39 #define ETP_SMBUS_RESOLUTION_CMD        0xA4
  40 #define ETP_SMBUS_HELLOPACKET_CMD       0xA7
  41 #define ETP_SMBUS_PACKET_QUERY          0xA8
  42 #define ETP_SMBUS_IAP_VERSION_CMD       0xAC
  43 #define ETP_SMBUS_IAP_CTRL_CMD          0xAD
  44 #define ETP_SMBUS_IAP_CHECKSUM_CMD      0xAE
  45 #define ETP_SMBUS_FW_CHECKSUM_CMD       0xAF
  46 #define ETP_SMBUS_MAX_BASELINE_CMD      0xC3
  47 #define ETP_SMBUS_MIN_BASELINE_CMD      0xC4
  48 #define ETP_SMBUS_CALIBRATE_QUERY       0xC5
  49
  50 #define ETP_SMBUS_REPORT_LEN            32
  51 #define ETP_SMBUS_REPORT_OFFSET         2
  52 #define ETP_SMBUS_HELLOPACKET_LEN       5
  53 #define ETP_SMBUS_IAP_PASSWORD          0x1234
  54 #define ETP_SMBUS_IAP_MODE_ON           (1 << 6)
  55
  56 static int elan_smbus_initialize(struct i2c_client *client)
  57 {
  58         u8 check[ETP_SMBUS_HELLOPACKET_LEN] = { 0x55, 0x55, 0x55, 0x55, 0x55 };
  59         u8 values[I2C_SMBUS_BLOCK_MAX] = {0};
  60         int len, error;
  61
  62         /* Get hello packet */
  63         len = i2c_smbus_read_block_data(client,
  64                                         ETP_SMBUS_HELLOPACKET_CMD, values);
  65         if (len != ETP_SMBUS_HELLOPACKET_LEN) {
  66                 dev_err(&client->dev, "hello packet length fail: %d\n", len);
  67                 error = len < 0 ? len : -EIO;
  68                 return error;
  69         }
  70
  71         /* compare hello packet */
  72         if (memcmp(values, check, ETP_SMBUS_HELLOPACKET_LEN)) {
  73                 dev_err(&client->dev, "hello packet fail [%*ph]\n",
  74                         ETP_SMBUS_HELLOPACKET_LEN, values);
  75                 return -ENXIO;
  76         }
  77
  78         /* enable tp */
  79         error = i2c_smbus_write_byte(client, ETP_SMBUS_ENABLE_TP);
  80         if (error) {
  81                 dev_err(&client->dev, "failed to enable touchpad: %d\n", error);
  82                 return error;
  83         }
  84
  85         return 0;
  86 }
  87
  88 static int elan_smbus_set_mode(struct i2c_client *client, u8 mode)
  89 {
  90         u8 cmd[4] = { 0x00, 0x07, 0x00, mode };
  91
  92         return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
  93                                           sizeof(cmd), cmd);
  94 }
  95
  96 static int elan_smbus_sleep_control(struct i2c_client *client, bool sleep)
  97 {
  98         if (sleep)
  99                 return i2c_smbus_write_byte(client, ETP_SMBUS_SLEEP_CMD);
 100         else
 101                 return 0; /* XXX should we send ETP_SMBUS_ENABLE_TP here? */
 102 }
 103
 104 static int elan_smbus_power_control(struct i2c_client *client, bool enable)
 105 {
 106         return 0; /* A no-op */
 107 }
 108
 109 static int elan_smbus_calibrate(struct i2c_client *client)
 110 {
 111         u8 cmd[4] = { 0x00, 0x08, 0x00, 0x01 };
 112
 113         return i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
 114                                           sizeof(cmd), cmd);
 115 }
 116
 117 static int elan_smbus_calibrate_result(struct i2c_client *client, u8 *val)
 118 {
 119         int error;
 120         u8 buf[I2C_SMBUS_BLOCK_MAX] = {0};
 121
 122         BUILD_BUG_ON(ETP_CALIBRATE_MAX_LEN > sizeof(buf));
 123
 124         error = i2c_smbus_read_block_data(client,
 125                                           ETP_SMBUS_CALIBRATE_QUERY, buf);
 126         if (error < 0)
 127                 return error;
 128
 129         memcpy(val, buf, ETP_CALIBRATE_MAX_LEN);
 130         return 0;
 131 }
 132
 133 static int elan_smbus_get_baseline_data(struct i2c_client *client,
 134                                         bool max_baseline, u8 *value)
 135 {
 136         int error;
 137         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 138
 139         error = i2c_smbus_read_block_data(client,
 140                                           max_baseline ?
 141                                                 ETP_SMBUS_MAX_BASELINE_CMD :
 142                                                 ETP_SMBUS_MIN_BASELINE_CMD,
 143                                           val);
 144         if (error < 0)
 145                 return error;
 146
 147         *value = be16_to_cpup((__be16 *)val);
 148
 149         return 0;
 150 }
 151
 152 static int elan_smbus_get_version(struct i2c_client *client,
 153                                   bool iap, u8 *version)
 154 {
 155         int error;
 156         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 157
 158         error = i2c_smbus_read_block_data(client,
 159                                           iap ? ETP_SMBUS_IAP_VERSION_CMD :
 160                                                 ETP_SMBUS_FW_VERSION_CMD,
 161                                           val);
 162         if (error < 0) {
 163                 dev_err(&client->dev, "failed to get %s version: %d\n",
 164                         iap ? "IAP" : "FW", error);
 165                 return error;
 166         }
 167
 168         *version = val[2];
 169         return 0;
 170 }
 171
 172 static int elan_smbus_get_sm_version(struct i2c_client *client,
 173                                      u16 *ic_type, u8 *version,
 174                                      u8 *clickpad)
 175 {
 176         int error;
 177         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 178
 179         error = i2c_smbus_read_block_data(client,
 180                                           ETP_SMBUS_SM_VERSION_CMD, val);
 181         if (error < 0) {
 182                 dev_err(&client->dev, "failed to get SM version: %d\n", error);
 183                 return error;
 184         }
 185
 186         *version = val[0];
 187         *ic_type = val[1];
 188         *clickpad = val[0] & 0x10;
 189         return 0;
 190 }
 191
 192 static int elan_smbus_get_product_id(struct i2c_client *client, u16 *id)
 193 {
 194         int error;
 195         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 196
 197         error = i2c_smbus_read_block_data(client,
 198                                           ETP_SMBUS_UNIQUEID_CMD, val);
 199         if (error < 0) {
 200                 dev_err(&client->dev, "failed to get product ID: %d\n", error);
 201                 return error;
 202         }
 203
 204         *id = be16_to_cpup((__be16 *)val);
 205         return 0;
 206 }
 207
 208 static int elan_smbus_get_checksum(struct i2c_client *client,
 209                                    bool iap, u16 *csum)
 210 {
 211         int error;
 212         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 213
 214         error = i2c_smbus_read_block_data(client,
 215                                           iap ? ETP_SMBUS_FW_CHECKSUM_CMD :
 216                                                 ETP_SMBUS_IAP_CHECKSUM_CMD,
 217                                           val);
 218         if (error < 0) {
 219                 dev_err(&client->dev, "failed to get %s checksum: %d\n",
 220                         iap ? "IAP" : "FW", error);
 221                 return error;
 222         }
 223
 224         *csum = be16_to_cpup((__be16 *)val);
 225         return 0;
 226 }
 227
 228 static int elan_smbus_get_max(struct i2c_client *client,
 229                               unsigned int *max_x, unsigned int *max_y)
 230 {
 231         int ret;
 232         int error;
 233         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 234
 235         ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RANGE_CMD, val);
 236         if (ret != 3) {
 237                 error = ret < 0 ? ret : -EIO;
 238                 dev_err(&client->dev, "failed to get dimensions: %d\n", error);
 239                 return error;
 240         }
 241
 242         *max_x = (0x0f & val[0]) << 8 | val[1];
 243         *max_y = (0xf0 & val[0]) << 4 | val[2];
 244
 245         return 0;
 246 }
 247
 248 static int elan_smbus_get_resolution(struct i2c_client *client,
 249                                      u8 *hw_res_x, u8 *hw_res_y)
 250 {
 251         int ret;
 252         int error;
 253         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 254
 255         ret = i2c_smbus_read_block_data(client, ETP_SMBUS_RESOLUTION_CMD, val);
 256         if (ret != 3) {
 257                 error = ret < 0 ? ret : -EIO;
 258                 dev_err(&client->dev, "failed to get resolution: %d\n", error);
 259                 return error;
 260         }
 261
 262         *hw_res_x = val[1] & 0x0F;
 263         *hw_res_y = (val[1] & 0xF0) >> 4;
 264
 265         return 0;
 266 }
 267
 268 static int elan_smbus_get_num_traces(struct i2c_client *client,
 269                                      unsigned int *x_traces,
 270                                      unsigned int *y_traces)
 271 {
 272         int ret;
 273         int error;
 274         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 275
 276         ret = i2c_smbus_read_block_data(client, ETP_SMBUS_XY_TRACENUM_CMD, val);
 277         if (ret != 3) {
 278                 error = ret < 0 ? ret : -EIO;
 279                 dev_err(&client->dev, "failed to get trace info: %d\n", error);
 280                 return error;
 281         }
 282
 283         *x_traces = val[1];
 284         *y_traces = val[2];
 285
 286         return 0;
 287 }
 288
 289 static int elan_smbus_get_pressure_adjustment(struct i2c_client *client,
 290                                               int *adjustment)
 291 {
 292         *adjustment = ETP_PRESSURE_OFFSET;
 293         return 0;
 294 }
 295
 296 static int elan_smbus_iap_get_mode(struct i2c_client *client,
 297                                    enum tp_mode *mode)
 298 {
 299         int error;
 300         u16 constant;
 301         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 302
 303         error = i2c_smbus_read_block_data(client, ETP_SMBUS_IAP_CTRL_CMD, val);
 304         if (error < 0) {
 305                 dev_err(&client->dev, "failed to read iap ctrol register: %d\n",
 306                         error);
 307                 return error;
 308         }
 309
 310         constant = be16_to_cpup((__be16 *)val);
 311         dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant);
 312
 313         *mode = (constant & ETP_SMBUS_IAP_MODE_ON) ? IAP_MODE : MAIN_MODE;
 314
 315         return 0;
 316 }
 317
 318 static int elan_smbus_iap_reset(struct i2c_client *client)
 319 {
 320         int error;
 321
 322         error = i2c_smbus_write_byte(client, ETP_SMBUS_IAP_RESET_CMD);
 323         if (error) {
 324                 dev_err(&client->dev, "cannot reset IC: %d\n", error);
 325                 return error;
 326         }
 327
 328         return 0;
 329 }
 330
 331 static int elan_smbus_set_flash_key(struct i2c_client *client)
 332 {
 333         int error;
 334         u8 cmd[4] = { 0x00, 0x0B, 0x00, 0x5A };
 335
 336         error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
 337                                            sizeof(cmd), cmd);
 338         if (error) {
 339                 dev_err(&client->dev, "cannot set flash key: %d\n", error);
 340                 return error;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static int elan_smbus_prepare_fw_update(struct i2c_client *client)
 347 {
 348         struct device *dev = &client->dev;
 349         int len;
 350         int error;
 351         enum tp_mode mode;
 352         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 353         u8 cmd[4] = {0x0F, 0x78, 0x00, 0x06};
 354         u16 password;
 355
 356         /* Get FW in which mode (IAP_MODE/MAIN_MODE)  */
 357         error = elan_smbus_iap_get_mode(client, &mode);
 358         if (error)
 359                 return error;
 360
 361         if (mode == MAIN_MODE) {
 362
 363                 /* set flash key */
 364                 error = elan_smbus_set_flash_key(client);
 365                 if (error)
 366                         return error;
 367
 368                 /* write iap password */
 369                 if (i2c_smbus_write_byte(client,
 370                                          ETP_SMBUS_IAP_PASSWORD_WRITE) < 0) {
 371                         dev_err(dev, "cannot write iap password\n");
 372                         return -EIO;
 373                 }
 374
 375                 error = i2c_smbus_write_block_data(client, ETP_SMBUS_IAP_CMD,
 376                                                    sizeof(cmd), cmd);
 377                 if (error) {
 378                         dev_err(dev, "failed to write iap password: %d\n",
 379                                 error);
 380                         return error;
 381                 }
 382
 383                 /*
 384                  * Read back password to make sure we enabled flash
 385                  * successfully.
 386                  */
 387                 len = i2c_smbus_read_block_data(client,
 388                                                 ETP_SMBUS_IAP_PASSWORD_READ,
 389                                                 val);
 390                 if (len < (int)sizeof(u16)) {
 391                         error = len < 0 ? len : -EIO;
 392                         dev_err(dev, "failed to read iap password: %d\n",
 393                                 error);
 394                         return error;
 395                 }
 396
 397                 password = be16_to_cpup((__be16 *)val);
 398                 if (password != ETP_SMBUS_IAP_PASSWORD) {
 399                         dev_err(dev, "wrong iap password = 0x%X\n", password);
 400                         return -EIO;
 401                 }
 402
 403                 /* Wait 30ms for MAIN_MODE change to IAP_MODE */
 404                 msleep(30);
 405         }
 406
 407         error = elan_smbus_set_flash_key(client);
 408         if (error)
 409                 return error;
 410
 411         /* Reset IC */
 412         error = elan_smbus_iap_reset(client);
 413         if (error)
 414                 return error;
 415
 416         return 0;
 417 }
 418
 419
 420 static int elan_smbus_write_fw_block(struct i2c_client *client,
 421                                      const u8 *page, u16 checksum, int idx)
 422 {
 423         struct device *dev = &client->dev;
 424         int error;
 425         u16 result;
 426         u8 val[I2C_SMBUS_BLOCK_MAX] = {0};
 427
 428         /*
 429          * Due to the limitation of smbus protocol limiting
 430          * transfer to 32 bytes at a time, we must split block
 431          * in 2 transfers.
 432          */
 433         error = i2c_smbus_write_block_data(client,
 434                                            ETP_SMBUS_WRITE_FW_BLOCK,
 435                                            ETP_FW_PAGE_SIZE / 2,
 436                                            page);
 437         if (error) {
 438                 dev_err(dev, "Failed to write page %d (part %d): %d\n",
 439                         idx, 1, error);
 440                 return error;
 441         }
 442
 443         error = i2c_smbus_write_block_data(client,
 444                                            ETP_SMBUS_WRITE_FW_BLOCK,
 445                                            ETP_FW_PAGE_SIZE / 2,
 446                                            page + ETP_FW_PAGE_SIZE / 2);
 447         if (error) {
 448                 dev_err(dev, "Failed to write page %d (part %d): %d\n",
 449                         idx, 2, error);
 450                 return error;
 451         }
 452
 453
 454         /* Wait for F/W to update one page ROM data. */
 455         usleep_range(8000, 10000);
 456
 457         error = i2c_smbus_read_block_data(client,
 458                                           ETP_SMBUS_IAP_CTRL_CMD, val);
 459         if (error < 0) {
 460                 dev_err(dev, "Failed to read IAP write result: %d\n",
 461                         error);
 462                 return error;
 463         }
 464
 465         result = be16_to_cpup((__be16 *)val);
 466         if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) {
 467                 dev_err(dev, "IAP reports failed write: %04hx\n",
 468                         result);
 469                 return -EIO;
 470         }
 471
 472         return 0;
 473 }
 474
 475 static int elan_smbus_get_report(struct i2c_client *client, u8 *report)
 476 {
 477         int len;
 478
 479         BUILD_BUG_ON(I2C_SMBUS_BLOCK_MAX > ETP_SMBUS_REPORT_LEN);
 480
 481         len = i2c_smbus_read_block_data(client,
 482                                         ETP_SMBUS_PACKET_QUERY,
 483                                         &report[ETP_SMBUS_REPORT_OFFSET]);
 484         if (len < 0) {
 485                 dev_err(&client->dev, "failed to read report data: %d\n", len);
 486                 return len;
 487         }
 488
 489         if (len != ETP_SMBUS_REPORT_LEN) {
 490                 dev_err(&client->dev,
 491                         "wrong report length (%d vs %d expected)\n",
 492                         len, ETP_SMBUS_REPORT_LEN);
 493                 return -EIO;
 494         }
 495
 496         return 0;
 497 }
 498
 499 static int elan_smbus_finish_fw_update(struct i2c_client *client,
 500                                        struct completion *fw_completion)
 501 {
 502         /* No special handling unlike I2C transport */
 503         return 0;
 504 }
 505
 506 static int elan_smbus_get_pattern(struct i2c_client *client, u8 *pattern)
 507 {
 508         *pattern = 0;
 509         return 0;
 510 }
 511
 512 const struct elan_transport_ops elan_smbus_ops = {
 513         .initialize             = elan_smbus_initialize,
 514         .sleep_control          = elan_smbus_sleep_control,
 515         .power_control          = elan_smbus_power_control,
 516         .set_mode               = elan_smbus_set_mode,
 517
 518         .calibrate              = elan_smbus_calibrate,
 519         .calibrate_result       = elan_smbus_calibrate_result,
 520
 521         .get_baseline_data      = elan_smbus_get_baseline_data,
 522
 523         .get_version            = elan_smbus_get_version,
 524         .get_sm_version         = elan_smbus_get_sm_version,
 525         .get_product_id         = elan_smbus_get_product_id,
 526         .get_checksum           = elan_smbus_get_checksum,
 527         .get_pressure_adjustment = elan_smbus_get_pressure_adjustment,
 528
 529         .get_max                = elan_smbus_get_max,
 530         .get_resolution         = elan_smbus_get_resolution,
 531         .get_num_traces         = elan_smbus_get_num_traces,
 532
 533         .iap_get_mode           = elan_smbus_iap_get_mode,
 534         .iap_reset              = elan_smbus_iap_reset,
 535
 536         .prepare_fw_update      = elan_smbus_prepare_fw_update,
 537         .write_fw_block         = elan_smbus_write_fw_block,
 538         .finish_fw_update       = elan_smbus_finish_fw_update,
 539
 540         .get_report             = elan_smbus_get_report,
 541         .get_pattern            = elan_smbus_get_pattern,
 542 };