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
 118 struct usb251xb {
 119         struct device *dev;
 120         struct i2c_client *i2c;
 121         u8 skip_config;
 122         int gpio_reset;
 123         u16 vendor_id;
 124         u16 product_id;
 125         u16 device_id;
 126         u8  conf_data1;
 127         u8  conf_data2;
 128         u8  conf_data3;
 129         u8  non_rem_dev;
 130         u8  port_disable_sp;
 131         u8  port_disable_bp;
 132         u8  max_power_sp;
 133         u8  max_power_bp;
 134         u8  max_current_sp;
 135         u8  max_current_bp;
 136         u8  power_on_time;
 137         u16 lang_id;
 138         u8 manufacturer_len;
 139         u8 product_len;
 140         u8 serial_len;
 141         char manufacturer[USB251XB_STRING_BUFSIZE];
 142         char product[USB251XB_STRING_BUFSIZE];
 143         char serial[USB251XB_STRING_BUFSIZE];
 144         u8  bat_charge_en;
 145         u8  boost_up;
 146         u8  boost_x;
 147         u8  port_swap;
 148         u8  port_map12;
 149         u8  port_map34;
 150         u8  status;
 151 };
 152
 153 struct usb251xb_data {
 154         u16 product_id;
 155         char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
 156 };
 157
 158 static const struct usb251xb_data usb2512b_data = {
 159         .product_id = 0x2512,
 160         .product_str = "USB2512B",
 161 };
 162
 163 static const struct usb251xb_data usb2512bi_data = {
 164         .product_id = 0x2512,
 165         .product_str = "USB2512Bi",
 166 };
 167
 168 static const struct usb251xb_data usb2513b_data = {
 169         .product_id = 0x2513,
 170         .product_str = "USB2513B",
 171 };
 172
 173 static const struct usb251xb_data usb2513bi_data = {
 174         .product_id = 0x2513,
 175         .product_str = "USB2513Bi",
 176 };
 177
 178 static const struct usb251xb_data usb2514b_data = {
 179         .product_id = 0x2514,
 180         .product_str = "USB2514B",
 181 };
 182
 183 static const struct usb251xb_data usb2514bi_data = {
 184         .product_id = 0x2514,
 185         .product_str = "USB2514Bi",
 186 };
 187
 188 static void usb251xb_reset(struct usb251xb *hub, int state)
 189 {
 190         if (!gpio_is_valid(hub->gpio_reset))
 191                 return;
 192
 193         gpio_set_value_cansleep(hub->gpio_reset, state);
 194
 195         /* wait for hub recovery/stabilization */
 196         if (state)
 197                 usleep_range(500, 750); /* >=500us at power on */
 198         else
 199                 usleep_range(1, 10);    /* >=1us at power down */
 200 }
 201
 202 static int usb251xb_connect(struct usb251xb *hub)
 203 {
 204         struct device *dev = hub->dev;
 205         int err, i;
 206         char i2c_wb[USB251XB_I2C_REG_SZ];
 207
 208         memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);
 209
 210         if (hub->skip_config) {
 211                 dev_info(dev, "Skip hub configuration, only attach.\n");
 212                 i2c_wb[0] = 0x01;
 213                 i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;
 214
 215                 usb251xb_reset(hub, 1);
 216
 217                 err = i2c_smbus_write_i2c_block_data(hub->i2c,
 218                                 USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
 219                 if (err) {
 220                         dev_err(dev, "attaching hub failed: %d\n", err);
 221                         return err;
 222                 }
 223                 return 0;
 224         }
 225
 226         i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB]     = (hub->vendor_id >> 8) & 0xFF;
 227         i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB]     = hub->vendor_id & 0xFF;
 228         i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB]    = (hub->product_id >> 8) & 0xFF;
 229         i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB]    = hub->product_id & 0xFF;
 230         i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB]     = (hub->device_id >> 8) & 0xFF;
 231         i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB]     = hub->device_id & 0xFF;
 232         i2c_wb[USB251XB_ADDR_CONFIG_DATA_1]     = hub->conf_data1;
 233         i2c_wb[USB251XB_ADDR_CONFIG_DATA_2]     = hub->conf_data2;
 234         i2c_wb[USB251XB_ADDR_CONFIG_DATA_3]     = hub->conf_data3;
 235         i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
 236         i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
 237         i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS]  = hub->port_disable_bp;
 238         i2c_wb[USB251XB_ADDR_MAX_POWER_SELF]    = hub->max_power_sp;
 239         i2c_wb[USB251XB_ADDR_MAX_POWER_BUS]     = hub->max_power_bp;
 240         i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF]  = hub->max_current_sp;
 241         i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS]   = hub->max_current_bp;
 242         i2c_wb[USB251XB_ADDR_POWER_ON_TIME]     = hub->power_on_time;
 243         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH]  = (hub->lang_id >> 8) & 0xFF;
 244         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW]   = hub->lang_id & 0xFF;
 245         i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
 246         i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN]      = hub->product_len;
 247         i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN]       = hub->serial_len;
 248         memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
 249                USB251XB_STRING_BUFSIZE);
 250         memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
 251                USB251XB_STRING_BUFSIZE);
 252         memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
 253                USB251XB_STRING_BUFSIZE);
 254         i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
 255         i2c_wb[USB251XB_ADDR_BOOST_UP]          = hub->boost_up;
 256         i2c_wb[USB251XB_ADDR_BOOST_X]           = hub->boost_x;
 257         i2c_wb[USB251XB_ADDR_PORT_SWAP]         = hub->port_swap;
 258         i2c_wb[USB251XB_ADDR_PORT_MAP_12]       = hub->port_map12;
 259         i2c_wb[USB251XB_ADDR_PORT_MAP_34]       = hub->port_map34;
 260         i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;
 261
 262         usb251xb_reset(hub, 1);
 263
 264         /* write registers */
 265         for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
 266                 int offset = i * USB251XB_I2C_WRITE_SZ;
 267                 char wbuf[USB251XB_I2C_WRITE_SZ + 1];
 268
 269                 /* The first data byte transferred tells the hub how many data
 270                  * bytes will follow (byte count).
 271                  */
 272                 wbuf[0] = USB251XB_I2C_WRITE_SZ;
 273                 memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);
 274
 275                 dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
 276                         USB251XB_I2C_WRITE_SZ, i, offset);
 277
 278                 err = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
 279                                                      USB251XB_I2C_WRITE_SZ + 1,
 280                                                      wbuf);
 281                 if (err)
 282                         goto out_err;
 283         }
 284
 285         dev_info(dev, "Hub configuration was successful.\n");
 286         return 0;
 287
 288 out_err:
 289         dev_err(dev, "configuring block %d failed: %d\n", i, err);
 290         return err;
 291 }
 292
 293 #ifdef CONFIG_OF
 294 static int usb251xb_get_ofdata(struct usb251xb *hub,
 295                                struct usb251xb_data *data)
 296 {
 297         struct device *dev = hub->dev;
 298         struct device_node *np = dev->of_node;
 299         int len, err, i;
 300         u32 *property_u32 = NULL;
 301         const u32 *cproperty_u32;
 302         const char *cproperty_char;
 303         char str[USB251XB_STRING_BUFSIZE / 2];
 304
 305         if (!np) {
 306                 dev_err(dev, "failed to get ofdata\n");
 307                 return -ENODEV;
 308         }
 309
 310         if (of_get_property(np, "skip-config", NULL))
 311                 hub->skip_config = 1;
 312         else
 313                 hub->skip_config = 0;
 314
 315         hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
 316         if (hub->gpio_reset == -EPROBE_DEFER)
 317                 return -EPROBE_DEFER;
 318         if (gpio_is_valid(hub->gpio_reset)) {
 319                 err = devm_gpio_request_one(dev, hub->gpio_reset,
 320                                             GPIOF_OUT_INIT_LOW,
 321                                             "usb251xb reset");
 322                 if (err) {
 323                         dev_err(dev,
 324                                 "unable to request GPIO %d as reset pin (%d)\n",
 325                                 hub->gpio_reset, err);
 326                         return err;
 327                 }
 328         }
 329
 330         if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
 331                 hub->vendor_id = USB251XB_DEF_VENDOR_ID;
 332
 333         if (of_property_read_u16_array(np, "product-id",
 334                                        &hub->product_id, 1))
 335                 hub->product_id = data->product_id;
 336
 337         if (of_property_read_u16_array(np, "device-id", &hub->device_id, 1))
 338                 hub->device_id = USB251XB_DEF_DEVICE_ID;
 339
 340         hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
 341         if (of_get_property(np, "self-powered", NULL)) {
 342                 hub->conf_data1 |= BIT(7);
 343
 344                 /* Configure Over-Current sens when self-powered */
 345                 hub->conf_data1 &= ~BIT(2);
 346                 if (of_get_property(np, "ganged-sensing", NULL))
 347                         hub->conf_data1 &= ~BIT(1);
 348                 else if (of_get_property(np, "individual-sensing", NULL))
 349                         hub->conf_data1 |= BIT(1);
 350         } else if (of_get_property(np, "bus-powered", NULL)) {
 351                 hub->conf_data1 &= ~BIT(7);
 352
 353                 /* Disable Over-Current sense when bus-powered */
 354                 hub->conf_data1 |= BIT(2);
 355         }
 356
 357         if (of_get_property(np, "disable-hi-speed", NULL))
 358                 hub->conf_data1 |= BIT(5);
 359
 360         if (of_get_property(np, "multi-tt", NULL))
 361                 hub->conf_data1 |= BIT(4);
 362         else if (of_get_property(np, "single-tt", NULL))
 363                 hub->conf_data1 &= ~BIT(4);
 364
 365         if (of_get_property(np, "disable-eop", NULL))
 366                 hub->conf_data1 |= BIT(3);
 367
 368         if (of_get_property(np, "individual-port-switching", NULL))
 369                 hub->conf_data1 |= BIT(0);
 370         else if (of_get_property(np, "ganged-port-switching", NULL))
 371                 hub->conf_data1 &= ~BIT(0);
 372
 373         hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
 374         if (of_get_property(np, "dynamic-power-switching", NULL))
 375                 hub->conf_data2 |= BIT(7);
 376
 377         if (!of_property_read_u32(np, "oc-delay-us", property_u32)) {
 378                 if (*property_u32 == 100) {
 379                         /* 100 us*/
 380                         hub->conf_data2 &= ~BIT(5);
 381                         hub->conf_data2 &= ~BIT(4);
 382                 } else if (*property_u32 == 4000) {
 383                         /* 4 ms */
 384                         hub->conf_data2 &= ~BIT(5);
 385                         hub->conf_data2 |= BIT(4);
 386                 } else if (*property_u32 == 16000) {
 387                         /* 16 ms */
 388                         hub->conf_data2 |= BIT(5);
 389                         hub->conf_data2 |= BIT(4);
 390                 } else {
 391                         /* 8 ms (DEFAULT) */
 392                         hub->conf_data2 |= BIT(5);
 393                         hub->conf_data2 &= ~BIT(4);
 394                 }
 395         }
 396
 397         if (of_get_property(np, "compound-device", NULL))
 398                 hub->conf_data2 |= BIT(3);
 399
 400         hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
 401         if (of_get_property(np, "port-mapping-mode", NULL))
 402                 hub->conf_data3 |= BIT(3);
 403
 404         if (of_get_property(np, "string-support", NULL))
 405                 hub->conf_data3 |= BIT(0);
 406
 407         hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
 408         cproperty_u32 = of_get_property(np, "non-removable-ports", &len);
 409         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 410                 for (i = 0; i < len / sizeof(u32); i++) {
 411                         u32 port = be32_to_cpu(cproperty_u32[i]);
 412
 413                         if ((port >= 1) && (port <= 4))
 414                                 hub->non_rem_dev |= BIT(port);
 415                 }
 416         }
 417
 418         hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
 419         cproperty_u32 = of_get_property(np, "sp-disabled-ports", &len);
 420         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 421                 for (i = 0; i < len / sizeof(u32); i++) {
 422                         u32 port = be32_to_cpu(cproperty_u32[i]);
 423
 424                         if ((port >= 1) && (port <= 4))
 425                                 hub->port_disable_sp |= BIT(port);
 426                 }
 427         }
 428
 429         hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
 430         cproperty_u32 = of_get_property(np, "bp-disabled-ports", &len);
 431         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 432                 for (i = 0; i < len / sizeof(u32); i++) {
 433                         u32 port = be32_to_cpu(cproperty_u32[i]);
 434
 435                         if ((port >= 1) && (port <= 4))
 436                                 hub->port_disable_bp |= BIT(port);
 437                 }
 438         }
 439
 440         hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
 441         if (!of_property_read_u32(np, "power-on-time-ms", property_u32))
 442                 hub->power_on_time = min_t(u8, *property_u32 / 2, 255);
 443
 444         if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
 445                 hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
 446
 447         cproperty_char = of_get_property(np, "manufacturer", NULL);
 448         strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
 449                 sizeof(str));
 450         hub->manufacturer_len = strlen(str) & 0xFF;
 451         memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
 452         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 453         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 454                               (wchar_t *)hub->manufacturer,
 455                               USB251XB_STRING_BUFSIZE);
 456
 457         cproperty_char = of_get_property(np, "product", NULL);
 458         strlcpy(str, cproperty_char ? : data->product_str, sizeof(str));
 459         hub->product_len = strlen(str) & 0xFF;
 460         memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
 461         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 462         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 463                               (wchar_t *)hub->product,
 464                               USB251XB_STRING_BUFSIZE);
 465
 466         cproperty_char = of_get_property(np, "serial", NULL);
 467         strlcpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
 468                 sizeof(str));
 469         hub->serial_len = strlen(str) & 0xFF;
 470         memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
 471         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 472         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 473                               (wchar_t *)hub->serial,
 474                               USB251XB_STRING_BUFSIZE);
 475
 476         /* The following parameters are currently not exposed to devicetree, but
 477          * may be as soon as needed.
 478          */
 479         hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
 480         hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
 481         hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
 482         hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
 483         hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
 484         hub->boost_up = USB251XB_DEF_BOOST_UP;
 485         hub->boost_x = USB251XB_DEF_BOOST_X;
 486         hub->port_swap = USB251XB_DEF_PORT_SWAP;
 487         hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
 488         hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
 489
 490         return 0;
 491 }
 492
 493 static const struct of_device_id usb251xb_of_match[] = {
 494         {
 495                 .compatible = "microchip,usb2512b",
 496                 .data = &usb2512b_data,
 497         }, {
 498                 .compatible = "microchip,usb2512bi",
 499                 .data = &usb2512bi_data,
 500         }, {
 501                 .compatible = "microchip,usb2513b",
 502                 .data = &usb2513b_data,
 503         }, {
 504                 .compatible = "microchip,usb2513bi",
 505                 .data = &usb2513bi_data,
 506         }, {
 507                 .compatible = "microchip,usb2514b",
 508                 .data = &usb2514b_data,
 509         }, {
 510                 .compatible = "microchip,usb2514bi",
 511                 .data = &usb2514bi_data,
 512         }, {
 513                 /* sentinel */
 514         }
 515 };
 516 MODULE_DEVICE_TABLE(of, usb251xb_of_match);
 517 #else /* CONFIG_OF */
 518 static int usb251xb_get_ofdata(struct usb251xb *hub,
 519                                struct usb251xb_data *data)
 520 {
 521         return 0;
 522 }
 523 #endif /* CONFIG_OF */
 524
 525 static int usb251xb_probe(struct usb251xb *hub)
 526 {
 527         struct device *dev = hub->dev;
 528         struct device_node *np = dev->of_node;
 529         const struct of_device_id *of_id = of_match_device(usb251xb_of_match,
 530                                                            dev);
 531         int err;
 532
 533         if (np && of_id) {
 534                 err = usb251xb_get_ofdata(hub,
 535                                           (struct usb251xb_data *)of_id->data);
 536                 if (err) {
 537                         dev_err(dev, "failed to get ofdata: %d\n", err);
 538                         return err;
 539                 }
 540         }
 541
 542         err = usb251xb_connect(hub);
 543         if (err) {
 544                 dev_err(dev, "Failed to connect hub (%d)\n", err);
 545                 return err;
 546         }
 547
 548         dev_info(dev, "Hub probed successfully\n");
 549
 550         return 0;
 551 }
 552
 553 static int usb251xb_i2c_probe(struct i2c_client *i2c,
 554                               const struct i2c_device_id *id)
 555 {
 556         struct usb251xb *hub;
 557
 558         hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
 559         if (!hub)
 560                 return -ENOMEM;
 561
 562         i2c_set_clientdata(i2c, hub);
 563         hub->dev = &i2c->dev;
 564         hub->i2c = i2c;
 565
 566         return usb251xb_probe(hub);
 567 }
 568
 569 static const struct i2c_device_id usb251xb_id[] = {
 570         { "usb2512b", 0 },
 571         { "usb2512bi", 0 },
 572         { "usb2513b", 0 },
 573         { "usb2513bi", 0 },
 574         { "usb2514b", 0 },
 575         { "usb2514bi", 0 },
 576         { /* sentinel */ }
 577 };
 578 MODULE_DEVICE_TABLE(i2c, usb251xb_id);
 579
 580 static struct i2c_driver usb251xb_i2c_driver = {
 581         .driver = {
 582                 .name = DRIVER_NAME,
 583                 .of_match_table = of_match_ptr(usb251xb_of_match),
 584         },
 585         .probe    = usb251xb_i2c_probe,
 586         .id_table = usb251xb_id,
 587 };
 588
 589 module_i2c_driver(usb251xb_i2c_driver);
 590
 591 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
 592 MODULE_DESCRIPTION("USB251xB/xBi USB 2.0 Hub Controller Driver");
 593 MODULE_LICENSE("GPL");