drivers/usb/misc/usb251xb.c

   1 /*
   2  * Driver for Microchip USB251xB USB 2.0 Hi-Speed Hub Controller
   3  * Configuration via SMBus.
   4  *
   5  * Copyright (c) 2017 SKIDATA AG
   6  *
   7  * This work is based on the USB3503 driver by Dongjin Kim and
   8  * a not-accepted patch by Fabien Lahoudere, see:
   9  * https://patchwork.kernel.org/patch/9257715/
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  */
  21
  22 #include <linux/delay.h>
  23 #include <linux/gpio.h>
  24 #include <linux/i2c.h>
  25 #include <linux/module.h>
  26 #include <linux/nls.h>
  27 #include <linux/of_device.h>
  28 #include <linux/of_gpio.h>
  29 #include <linux/slab.h>
  30
  31 /* Internal Register Set Addresses & Default Values acc. to DS00001692C */
  32 #define USB251XB_ADDR_VENDOR_ID_LSB     0x00
  33 #define USB251XB_ADDR_VENDOR_ID_MSB     0x01
  34 #define USB251XB_DEF_VENDOR_ID          0x0424
  35
  36 #define USB251XB_ADDR_PRODUCT_ID_LSB    0x02
  37 #define USB251XB_ADDR_PRODUCT_ID_MSB    0x03
  38 #define USB251XB_DEF_PRODUCT_ID_12      0x2512 /* USB2512B/12Bi */
  39 #define USB251XB_DEF_PRODUCT_ID_13      0x2513 /* USB2513B/13Bi */
  40 #define USB251XB_DEF_PRODUCT_ID_14      0x2514 /* USB2514B/14Bi */
  41
  42 #define USB251XB_ADDR_DEVICE_ID_LSB     0x04
  43 #define USB251XB_ADDR_DEVICE_ID_MSB     0x05
  44 #define USB251XB_DEF_DEVICE_ID          0x0BB3
  45
  46 #define USB251XB_ADDR_CONFIG_DATA_1     0x06
  47 #define USB251XB_DEF_CONFIG_DATA_1      0x9B
  48 #define USB251XB_ADDR_CONFIG_DATA_2     0x07
  49 #define USB251XB_DEF_CONFIG_DATA_2      0x20
  50 #define USB251XB_ADDR_CONFIG_DATA_3     0x08
  51 #define USB251XB_DEF_CONFIG_DATA_3      0x02
  52
  53 #define USB251XB_ADDR_NON_REMOVABLE_DEVICES     0x09
  54 #define USB251XB_DEF_NON_REMOVABLE_DEVICES      0x00
  55
  56 #define USB251XB_ADDR_PORT_DISABLE_SELF 0x0A
  57 #define USB251XB_DEF_PORT_DISABLE_SELF  0x00
  58 #define USB251XB_ADDR_PORT_DISABLE_BUS  0x0B
  59 #define USB251XB_DEF_PORT_DISABLE_BUS   0x00
  60
  61 #define USB251XB_ADDR_MAX_POWER_SELF    0x0C
  62 #define USB251XB_DEF_MAX_POWER_SELF     0x01
  63 #define USB251XB_ADDR_MAX_POWER_BUS     0x0D
  64 #define USB251XB_DEF_MAX_POWER_BUS      0x32
  65
  66 #define USB251XB_ADDR_MAX_CURRENT_SELF  0x0E
  67 #define USB251XB_DEF_MAX_CURRENT_SELF   0x01
  68 #define USB251XB_ADDR_MAX_CURRENT_BUS   0x0F
  69 #define USB251XB_DEF_MAX_CURRENT_BUS    0x32
  70
  71 #define USB251XB_ADDR_POWER_ON_TIME     0x10
  72 #define USB251XB_DEF_POWER_ON_TIME      0x32
  73
  74 #define USB251XB_ADDR_LANGUAGE_ID_HIGH  0x11
  75 #define USB251XB_ADDR_LANGUAGE_ID_LOW   0x12
  76 #define USB251XB_DEF_LANGUAGE_ID        0x0000
  77
  78 #define USB251XB_STRING_BUFSIZE                 62
  79 #define USB251XB_ADDR_MANUFACTURER_STRING_LEN   0x13
  80 #define USB251XB_ADDR_MANUFACTURER_STRING       0x16
  81 #define USB251XB_DEF_MANUFACTURER_STRING        "Microchip"
  82
  83 #define USB251XB_ADDR_PRODUCT_STRING_LEN        0x14
  84 #define USB251XB_ADDR_PRODUCT_STRING            0x54
  85 #define USB251XB_DEF_PRODUCT_STRING             "USB251xB/xBi"
  86
  87 #define USB251XB_ADDR_SERIAL_STRING_LEN         0x15
  88 #define USB251XB_ADDR_SERIAL_STRING             0x92
  89 #define USB251XB_DEF_SERIAL_STRING              ""
  90
  91 #define USB251XB_ADDR_BATTERY_CHARGING_ENABLE   0xD0
  92 #define USB251XB_DEF_BATTERY_CHARGING_ENABLE    0x00
  93
  94 #define USB251XB_ADDR_BOOST_UP  0xF6
  95 #define USB251XB_DEF_BOOST_UP   0x00
  96 #define USB251XB_ADDR_BOOST_X   0xF8
  97 #define USB251XB_DEF_BOOST_X    0x00
  98
  99 #define USB251XB_ADDR_PORT_SWAP 0xFA
 100 #define USB251XB_DEF_PORT_SWAP  0x00
 101
 102 #define USB251XB_ADDR_PORT_MAP_12       0xFB
 103 #define USB251XB_DEF_PORT_MAP_12        0x00
 104 #define USB251XB_ADDR_PORT_MAP_34       0xFC
 105 #define USB251XB_DEF_PORT_MAP_34        0x00 /* USB2513B/i & USB2514B/i only */
 106
 107 #define USB251XB_ADDR_STATUS_COMMAND            0xFF
 108 #define USB251XB_STATUS_COMMAND_SMBUS_DOWN      0x04
 109 #define USB251XB_STATUS_COMMAND_RESET           0x02
 110 #define USB251XB_STATUS_COMMAND_ATTACH          0x01
 111
 112 #define USB251XB_I2C_REG_SZ     0x100
 113 #define USB251XB_I2C_WRITE_SZ   0x10
 114
 115 #define DRIVER_NAME     "usb251xb"
 116 #define DRIVER_DESC     "Microchip USB 2.0 Hi-Speed Hub Controller"
 117 #define DRIVER_VERSION  "1.0"
 118
 119 struct usb251xb {
 120         struct device *dev;
 121         struct i2c_client *i2c;
 122         u8 skip_config;
 123         int gpio_reset;
 124         u16 vendor_id;
 125         u16 product_id;
 126         u16 device_id;
 127         u8  conf_data1;
 128         u8  conf_data2;
 129         u8  conf_data3;
 130         u8  non_rem_dev;
 131         u8  port_disable_sp;
 132         u8  port_disable_bp;
 133         u8  max_power_sp;
 134         u8  max_power_bp;
 135         u8  max_current_sp;
 136         u8  max_current_bp;
 137         u8  power_on_time;
 138         u16 lang_id;
 139         u8 manufacturer_len;
 140         u8 product_len;
 141         u8 serial_len;
 142         char manufacturer[USB251XB_STRING_BUFSIZE];
 143         char product[USB251XB_STRING_BUFSIZE];
 144         char serial[USB251XB_STRING_BUFSIZE];
 145         u8  bat_charge_en;
 146         u8  boost_up;
 147         u8  boost_x;
 148         u8  port_swap;
 149         u8  port_map12;
 150         u8  port_map34;
 151         u8  status;
 152 };
 153
 154 struct usb251xb_data {
 155         u16 product_id;
 156         char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
 157 };
 158
 159 static const struct usb251xb_data usb2512b_data = {
 160         .product_id = 0x2512,
 161         .product_str = "USB2512B",
 162 };
 163
 164 static const struct usb251xb_data usb2512bi_data = {
 165         .product_id = 0x2512,
 166         .product_str = "USB2512Bi",
 167 };
 168
 169 static const struct usb251xb_data usb2513b_data = {
 170         .product_id = 0x2513,
 171         .product_str = "USB2513B",
 172 };
 173
 174 static const struct usb251xb_data usb2513bi_data = {
 175         .product_id = 0x2513,
 176         .product_str = "USB2513Bi",
 177 };
 178
 179 static const struct usb251xb_data usb2514b_data = {
 180         .product_id = 0x2514,
 181         .product_str = "USB2514B",
 182 };
 183
 184 static const struct usb251xb_data usb2514bi_data = {
 185         .product_id = 0x2514,
 186         .product_str = "USB2514Bi",
 187 };
 188
 189 static void usb251xb_reset(struct usb251xb *hub, int state)
 190 {
 191         if (!gpio_is_valid(hub->gpio_reset))
 192                 return;
 193
 194         gpio_set_value_cansleep(hub->gpio_reset, state);
 195
 196         /* wait for hub recovery/stabilization */
 197         if (state)
 198                 usleep_range(500, 750); /* >=500us at power on */
 199         else
 200                 usleep_range(1, 10);    /* >=1us at power down */
 201 }
 202
 203 static int usb251xb_connect(struct usb251xb *hub)
 204 {
 205         struct device *dev = hub->dev;
 206         int err, i;
 207         char i2c_wb[USB251XB_I2C_REG_SZ];
 208
 209         memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);
 210
 211         if (hub->skip_config) {
 212                 dev_info(dev, "Skip hub configuration, only attach.\n");
 213                 i2c_wb[0] = 0x01;
 214                 i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;
 215
 216                 usb251xb_reset(hub, 1);
 217
 218                 err = i2c_smbus_write_i2c_block_data(hub->i2c,
 219                                 USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
 220                 if (err) {
 221                         dev_err(dev, "attaching hub failed: %d\n", err);
 222                         return err;
 223                 }
 224                 return 0;
 225         }
 226
 227         i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB]     = (hub->vendor_id >> 8) & 0xFF;
 228         i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB]     = hub->vendor_id & 0xFF;
 229         i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB]    = (hub->product_id >> 8) & 0xFF;
 230         i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB]    = hub->product_id & 0xFF;
 231         i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB]     = (hub->device_id >> 8) & 0xFF;
 232         i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB]     = hub->device_id & 0xFF;
 233         i2c_wb[USB251XB_ADDR_CONFIG_DATA_1]     = hub->conf_data1;
 234         i2c_wb[USB251XB_ADDR_CONFIG_DATA_2]     = hub->conf_data2;
 235         i2c_wb[USB251XB_ADDR_CONFIG_DATA_3]     = hub->conf_data3;
 236         i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
 237         i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
 238         i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS]  = hub->port_disable_bp;
 239         i2c_wb[USB251XB_ADDR_MAX_POWER_SELF]    = hub->max_power_sp;
 240         i2c_wb[USB251XB_ADDR_MAX_POWER_BUS]     = hub->max_power_bp;
 241         i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF]  = hub->max_current_sp;
 242         i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS]   = hub->max_current_bp;
 243         i2c_wb[USB251XB_ADDR_POWER_ON_TIME]     = hub->power_on_time;
 244         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH]  = (hub->lang_id >> 8) & 0xFF;
 245         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW]   = hub->lang_id & 0xFF;
 246         i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
 247         i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN]      = hub->product_len;
 248         i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN]       = hub->serial_len;
 249         memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
 250                USB251XB_STRING_BUFSIZE);
 251         memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
 252                USB251XB_STRING_BUFSIZE);
 253         memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
 254                USB251XB_STRING_BUFSIZE);
 255         i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
 256         i2c_wb[USB251XB_ADDR_BOOST_UP]          = hub->boost_up;
 257         i2c_wb[USB251XB_ADDR_BOOST_X]           = hub->boost_x;
 258         i2c_wb[USB251XB_ADDR_PORT_SWAP]         = hub->port_swap;
 259         i2c_wb[USB251XB_ADDR_PORT_MAP_12]       = hub->port_map12;
 260         i2c_wb[USB251XB_ADDR_PORT_MAP_34]       = hub->port_map34;
 261         i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;
 262
 263         usb251xb_reset(hub, 1);
 264
 265         /* write registers */
 266         for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
 267                 int offset = i * USB251XB_I2C_WRITE_SZ;
 268                 char wbuf[USB251XB_I2C_WRITE_SZ + 1];
 269
 270                 /* The first data byte transferred tells the hub how many data
 271                  * bytes will follow (byte count).
 272                  */
 273                 wbuf[0] = USB251XB_I2C_WRITE_SZ;
 274                 memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);
 275
 276                 dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
 277                         USB251XB_I2C_WRITE_SZ, i, offset);
 278
 279                 err = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
 280                                                      USB251XB_I2C_WRITE_SZ + 1,
 281                                                      wbuf);
 282                 if (err)
 283                         goto out_err;
 284         }
 285
 286         dev_info(dev, "Hub configuration was successful.\n");
 287         return 0;
 288
 289 out_err:
 290         dev_err(dev, "configuring block %d failed: %d\n", i, err);
 291         return err;
 292 }
 293
 294 #ifdef CONFIG_OF
 295 static int usb251xb_get_ofdata(struct usb251xb *hub,
 296                                struct usb251xb_data *data)
 297 {
 298         struct device *dev = hub->dev;
 299         struct device_node *np = dev->of_node;
 300         int len, err, i;
 301         u32 *property_u32 = NULL;
 302         const u32 *cproperty_u32;
 303         const char *cproperty_char;
 304         char str[USB251XB_STRING_BUFSIZE / 2];
 305
 306         if (!np) {
 307                 dev_err(dev, "failed to get ofdata\n");
 308                 return -ENODEV;
 309         }
 310
 311         if (of_get_property(np, "skip-config", NULL))
 312                 hub->skip_config = 1;
 313         else
 314                 hub->skip_config = 0;
 315
 316         hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
 317         if (hub->gpio_reset == -EPROBE_DEFER)
 318                 return -EPROBE_DEFER;
 319         if (gpio_is_valid(hub->gpio_reset)) {
 320                 err = devm_gpio_request_one(dev, hub->gpio_reset,
 321                                             GPIOF_OUT_INIT_LOW,
 322                                             "usb251xb reset");
 323                 if (err) {
 324                         dev_err(dev,
 325                                 "unable to request GPIO %d as reset pin (%d)\n",
 326                                 hub->gpio_reset, err);
 327                         return err;
 328                 }
 329         }
 330
 331         if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
 332                 hub->vendor_id = USB251XB_DEF_VENDOR_ID;
 333
 334         if (of_property_read_u16_array(np, "product-id",
 335                                        &hub->product_id, 1))
 336                 hub->product_id = data->product_id;
 337
 338         if (of_property_read_u16_array(np, "device-id", &hub->device_id, 1))
 339                 hub->device_id = USB251XB_DEF_DEVICE_ID;
 340
 341         hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
 342         if (of_get_property(np, "self-powered", NULL)) {
 343                 hub->conf_data1 |= BIT(7);
 344
 345                 /* Configure Over-Current sens when self-powered */
 346                 hub->conf_data1 &= ~BIT(2);
 347                 if (of_get_property(np, "ganged-sensing", NULL))
 348                         hub->conf_data1 &= ~BIT(1);
 349                 else if (of_get_property(np, "individual-sensing", NULL))
 350                         hub->conf_data1 |= BIT(1);
 351         } else if (of_get_property(np, "bus-powered", NULL)) {
 352                 hub->conf_data1 &= ~BIT(7);
 353
 354                 /* Disable Over-Current sense when bus-powered */
 355                 hub->conf_data1 |= BIT(2);
 356         }
 357
 358         if (of_get_property(np, "disable-hi-speed", NULL))
 359                 hub->conf_data1 |= BIT(5);
 360
 361         if (of_get_property(np, "multi-tt", NULL))
 362                 hub->conf_data1 |= BIT(4);
 363         else if (of_get_property(np, "single-tt", NULL))
 364                 hub->conf_data1 &= ~BIT(4);
 365
 366         if (of_get_property(np, "disable-eop", NULL))
 367                 hub->conf_data1 |= BIT(3);
 368
 369         if (of_get_property(np, "individual-port-switching", NULL))
 370                 hub->conf_data1 |= BIT(0);
 371         else if (of_get_property(np, "ganged-port-switching", NULL))
 372                 hub->conf_data1 &= ~BIT(0);
 373
 374         hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
 375         if (of_get_property(np, "dynamic-power-switching", NULL))
 376                 hub->conf_data2 |= BIT(7);
 377
 378         if (of_get_property(np, "oc-delay-100us", NULL)) {
 379                 hub->conf_data2 &= ~BIT(5);
 380                 hub->conf_data2 &= ~BIT(4);
 381         } else if (of_get_property(np, "oc-delay-4ms", NULL)) {
 382                 hub->conf_data2 &= ~BIT(5);
 383                 hub->conf_data2 |= BIT(4);
 384         } else if (of_get_property(np, "oc-delay-8ms", NULL)) {
 385                 hub->conf_data2 |= BIT(5);
 386                 hub->conf_data2 &= ~BIT(4);
 387         } else if (of_get_property(np, "oc-delay-16ms", NULL)) {
 388                 hub->conf_data2 |= BIT(5);
 389                 hub->conf_data2 |= BIT(4);
 390         }
 391
 392         if (of_get_property(np, "compound-device", NULL))
 393                 hub->conf_data2 |= BIT(3);
 394
 395         hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
 396         if (of_get_property(np, "port-mapping-mode", NULL))
 397                 hub->conf_data3 |= BIT(3);
 398
 399         if (of_get_property(np, "string-support", NULL))
 400                 hub->conf_data3 |= BIT(0);
 401
 402         hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
 403         cproperty_u32 = of_get_property(np, "non-removable-ports", &len);
 404         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 405                 for (i = 0; i < len / sizeof(u32); i++) {
 406                         u32 port = be32_to_cpu(cproperty_u32[i]);
 407
 408                         if ((port >= 1) && (port <= 4))
 409                                 hub->non_rem_dev |= BIT(port);
 410                 }
 411         }
 412
 413         hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
 414         cproperty_u32 = of_get_property(np, "sp-disabled-ports", &len);
 415         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 416                 for (i = 0; i < len / sizeof(u32); i++) {
 417                         u32 port = be32_to_cpu(cproperty_u32[i]);
 418
 419                         if ((port >= 1) && (port <= 4))
 420                                 hub->port_disable_sp |= BIT(port);
 421                 }
 422         }
 423
 424         hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
 425         cproperty_u32 = of_get_property(np, "bp-disabled-ports", &len);
 426         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 427                 for (i = 0; i < len / sizeof(u32); i++) {
 428                         u32 port = be32_to_cpu(cproperty_u32[i]);
 429
 430                         if ((port >= 1) && (port <= 4))
 431                                 hub->port_disable_bp |= BIT(port);
 432                 }
 433         }
 434
 435         hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
 436         if (!of_property_read_u32(np, "max-sp-power", property_u32))
 437                 hub->max_power_sp = min_t(u8, be32_to_cpu(*property_u32) / 2,
 438                                           250);
 439
 440         hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
 441         if (!of_property_read_u32(np, "max-bp-power", property_u32))
 442                 hub->max_power_bp = min_t(u8, be32_to_cpu(*property_u32) / 2,
 443                                           250);
 444
 445         hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
 446         if (!of_property_read_u32(np, "max-sp-current", property_u32))
 447                 hub->max_current_sp = min_t(u8, be32_to_cpu(*property_u32) / 2,
 448                                             250);
 449
 450         hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
 451         if (!of_property_read_u32(np, "max-bp-current", property_u32))
 452                 hub->max_current_bp = min_t(u8, be32_to_cpu(*property_u32) / 2,
 453                                             250);
 454
 455         hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
 456         if (!of_property_read_u32(np, "power-on-time", property_u32))
 457                 hub->power_on_time = min_t(u8, be32_to_cpu(*property_u32) / 2,
 458                                            255);
 459
 460         if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
 461                 hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
 462
 463         cproperty_char = of_get_property(np, "manufacturer", NULL);
 464         strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
 465                 sizeof(str));
 466         hub->manufacturer_len = strlen(str) & 0xFF;
 467         memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
 468         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 469         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 470                               (wchar_t *)hub->manufacturer,
 471                               USB251XB_STRING_BUFSIZE);
 472
 473         cproperty_char = of_get_property(np, "product", NULL);
 474         strlcpy(str, cproperty_char ? : data->product_str, sizeof(str));
 475         hub->product_len = strlen(str) & 0xFF;
 476         memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
 477         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 478         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 479                               (wchar_t *)hub->product,
 480                               USB251XB_STRING_BUFSIZE);
 481
 482         cproperty_char = of_get_property(np, "serial", NULL);
 483         strlcpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
 484                 sizeof(str));
 485         hub->serial_len = strlen(str) & 0xFF;
 486         memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
 487         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 488         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 489                               (wchar_t *)hub->serial,
 490                               USB251XB_STRING_BUFSIZE);
 491
 492         /* The following parameters are currently not exposed to devicetree, but
 493          * may be as soon as needed.
 494          */
 495         hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
 496         hub->boost_up = USB251XB_DEF_BOOST_UP;
 497         hub->boost_x = USB251XB_DEF_BOOST_X;
 498         hub->port_swap = USB251XB_DEF_PORT_SWAP;
 499         hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
 500         hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
 501
 502         return 0;
 503 }
 504
 505 static const struct of_device_id usb251xb_of_match[] = {
 506         {
 507                 .compatible = "microchip,usb2512b",
 508                 .data = &usb2512b_data,
 509         }, {
 510                 .compatible = "microchip,usb2512bi",
 511                 .data = &usb2512bi_data,
 512         }, {
 513                 .compatible = "microchip,usb2513b",
 514                 .data = &usb2513b_data,
 515         }, {
 516                 .compatible = "microchip,usb2513bi",
 517                 .data = &usb2513bi_data,
 518         }, {
 519                 .compatible = "microchip,usb2514b",
 520                 .data = &usb2514b_data,
 521         }, {
 522                 .compatible = "microchip,usb2514bi",
 523                 .data = &usb2514bi_data,
 524         }, {
 525                 /* sentinel */
 526         }
 527 };
 528 MODULE_DEVICE_TABLE(of, usb251xb_of_match);
 529 #else /* CONFIG_OF */
 530 static int usb251xb_get_ofdata(struct usb251xb *hub,
 531                                struct usb251xb_data *data)
 532 {
 533         return 0;
 534 }
 535 #endif /* CONFIG_OF */
 536
 537 static int usb251xb_probe(struct usb251xb *hub)
 538 {
 539         struct device *dev = hub->dev;
 540         struct device_node *np = dev->of_node;
 541         const struct of_device_id *of_id = of_match_device(usb251xb_of_match,
 542                                                            dev);
 543         int err;
 544
 545         if (np) {
 546                 err = usb251xb_get_ofdata(hub,
 547                                           (struct usb251xb_data *)of_id->data);
 548                 if (err) {
 549                         dev_err(dev, "failed to get ofdata: %d\n", err);
 550                         return err;
 551                 }
 552         }
 553
 554         err = usb251xb_connect(hub);
 555         if (err) {
 556                 dev_err(dev, "Failed to connect hub (%d)\n", err);
 557                 return err;
 558         }
 559
 560         dev_info(dev, "Hub probed successfully\n");
 561
 562         return 0;
 563 }
 564
 565 static int usb251xb_i2c_probe(struct i2c_client *i2c,
 566                               const struct i2c_device_id *id)
 567 {
 568         struct usb251xb *hub;
 569
 570         hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
 571         if (!hub)
 572                 return -ENOMEM;
 573
 574         i2c_set_clientdata(i2c, hub);
 575         hub->dev = &i2c->dev;
 576         hub->i2c = i2c;
 577
 578         return usb251xb_probe(hub);
 579 }
 580
 581 static const struct i2c_device_id usb251xb_id[] = {
 582         { "usb2512b", 0 },
 583         { "usb2512bi", 0 },
 584         { "usb2513b", 0 },
 585         { "usb2513bi", 0 },
 586         { "usb2514b", 0 },
 587         { "usb2514bi", 0 },
 588         { /* sentinel */ }
 589 };
 590 MODULE_DEVICE_TABLE(i2c, usb251xb_id);
 591
 592 static struct i2c_driver usb251xb_i2c_driver = {
 593         .driver = {
 594                 .name = DRIVER_NAME,
 595                 .of_match_table = of_match_ptr(usb251xb_of_match),
 596         },
 597         .probe    = usb251xb_i2c_probe,
 598         .id_table = usb251xb_id,
 599 };
 600
 601 module_i2c_driver(usb251xb_i2c_driver);
 602
 603 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
 604 MODULE_DESCRIPTION("USB251xB/xBi USB 2.0 Hub Controller Driver");
 605 MODULE_LICENSE("GPL");