drivers/usb/misc/usb251xb.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for Microchip USB251xB USB 2.0 Hi-Speed Hub Controller
   4  * Configuration via SMBus.
   5  *
   6  * Copyright (c) 2017 SKIDATA AG
   7  *
   8  * This work is based on the USB3503 driver by Dongjin Kim and
   9  * a not-accepted patch by Fabien Lahoudere, see:
  10  * https://patchwork.kernel.org/patch/9257715/
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/i2c.h>
  16 #include <linux/module.h>
  17 #include <linux/nls.h>
  18 #include <linux/of_device.h>
  19 #include <linux/slab.h>
  20
  21 /* Internal Register Set Addresses & Default Values acc. to DS00001692C */
  22 #define USB251XB_ADDR_VENDOR_ID_LSB     0x00
  23 #define USB251XB_ADDR_VENDOR_ID_MSB     0x01
  24 #define USB251XB_DEF_VENDOR_ID          0x0424
  25
  26 #define USB251XB_ADDR_PRODUCT_ID_LSB    0x02
  27 #define USB251XB_ADDR_PRODUCT_ID_MSB    0x03
  28 #define USB251XB_DEF_PRODUCT_ID_12      0x2512 /* USB2512B/12Bi */
  29 #define USB251XB_DEF_PRODUCT_ID_13      0x2513 /* USB2513B/13Bi */
  30 #define USB251XB_DEF_PRODUCT_ID_14      0x2514 /* USB2514B/14Bi */
  31 #define USB251XB_DEF_PRODUCT_ID_17      0x2517 /* USB2517/17i */
  32
  33 #define USB251XB_ADDR_DEVICE_ID_LSB     0x04
  34 #define USB251XB_ADDR_DEVICE_ID_MSB     0x05
  35 #define USB251XB_DEF_DEVICE_ID          0x0BB3
  36
  37 #define USB251XB_ADDR_CONFIG_DATA_1     0x06
  38 #define USB251XB_DEF_CONFIG_DATA_1      0x9B
  39 #define USB251XB_ADDR_CONFIG_DATA_2     0x07
  40 #define USB251XB_DEF_CONFIG_DATA_2      0x20
  41 #define USB251XB_ADDR_CONFIG_DATA_3     0x08
  42 #define USB251XB_DEF_CONFIG_DATA_3      0x02
  43
  44 #define USB251XB_ADDR_NON_REMOVABLE_DEVICES     0x09
  45 #define USB251XB_DEF_NON_REMOVABLE_DEVICES      0x00
  46
  47 #define USB251XB_ADDR_PORT_DISABLE_SELF 0x0A
  48 #define USB251XB_DEF_PORT_DISABLE_SELF  0x00
  49 #define USB251XB_ADDR_PORT_DISABLE_BUS  0x0B
  50 #define USB251XB_DEF_PORT_DISABLE_BUS   0x00
  51
  52 #define USB251XB_ADDR_MAX_POWER_SELF    0x0C
  53 #define USB251XB_DEF_MAX_POWER_SELF     0x01
  54 #define USB251XB_ADDR_MAX_POWER_BUS     0x0D
  55 #define USB251XB_DEF_MAX_POWER_BUS      0x32
  56
  57 #define USB251XB_ADDR_MAX_CURRENT_SELF  0x0E
  58 #define USB251XB_DEF_MAX_CURRENT_SELF   0x01
  59 #define USB251XB_ADDR_MAX_CURRENT_BUS   0x0F
  60 #define USB251XB_DEF_MAX_CURRENT_BUS    0x32
  61
  62 #define USB251XB_ADDR_POWER_ON_TIME     0x10
  63 #define USB251XB_DEF_POWER_ON_TIME      0x32
  64
  65 #define USB251XB_ADDR_LANGUAGE_ID_HIGH  0x11
  66 #define USB251XB_ADDR_LANGUAGE_ID_LOW   0x12
  67 #define USB251XB_DEF_LANGUAGE_ID        0x0000
  68
  69 #define USB251XB_STRING_BUFSIZE                 62
  70 #define USB251XB_ADDR_MANUFACTURER_STRING_LEN   0x13
  71 #define USB251XB_ADDR_MANUFACTURER_STRING       0x16
  72 #define USB251XB_DEF_MANUFACTURER_STRING        "Microchip"
  73
  74 #define USB251XB_ADDR_PRODUCT_STRING_LEN        0x14
  75 #define USB251XB_ADDR_PRODUCT_STRING            0x54
  76 #define USB251XB_DEF_PRODUCT_STRING             "USB251xB/xBi/7i"
  77
  78 #define USB251XB_ADDR_SERIAL_STRING_LEN         0x15
  79 #define USB251XB_ADDR_SERIAL_STRING             0x92
  80 #define USB251XB_DEF_SERIAL_STRING              ""
  81
  82 #define USB251XB_ADDR_BATTERY_CHARGING_ENABLE   0xD0
  83 #define USB251XB_DEF_BATTERY_CHARGING_ENABLE    0x00
  84
  85 #define USB251XB_ADDR_BOOST_UP  0xF6
  86 #define USB251XB_DEF_BOOST_UP   0x00
  87 #define USB251XB_ADDR_BOOST_57  0xF7
  88 #define USB251XB_DEF_BOOST_57   0x00
  89 #define USB251XB_ADDR_BOOST_14  0xF8
  90 #define USB251XB_DEF_BOOST_14   0x00
  91
  92 #define USB251XB_ADDR_PORT_SWAP 0xFA
  93 #define USB251XB_DEF_PORT_SWAP  0x00
  94
  95 #define USB251XB_ADDR_PORT_MAP_12       0xFB
  96 #define USB251XB_DEF_PORT_MAP_12        0x00
  97 #define USB251XB_ADDR_PORT_MAP_34       0xFC
  98 #define USB251XB_DEF_PORT_MAP_34        0x00 /* USB251{3B/i,4B/i,7/i} only */
  99 #define USB251XB_ADDR_PORT_MAP_56       0xFD
 100 #define USB251XB_DEF_PORT_MAP_56        0x00 /* USB2517/i only */
 101 #define USB251XB_ADDR_PORT_MAP_7        0xFE
 102 #define USB251XB_DEF_PORT_MAP_7         0x00 /* USB2517/i only */
 103
 104 #define USB251XB_ADDR_STATUS_COMMAND            0xFF
 105 #define USB251XB_STATUS_COMMAND_SMBUS_DOWN      0x04
 106 #define USB251XB_STATUS_COMMAND_RESET           0x02
 107 #define USB251XB_STATUS_COMMAND_ATTACH          0x01
 108
 109 #define USB251XB_I2C_REG_SZ     0x100
 110 #define USB251XB_I2C_WRITE_SZ   0x10
 111
 112 #define DRIVER_NAME     "usb251xb"
 113 #define DRIVER_DESC     "Microchip USB 2.0 Hi-Speed Hub Controller"
 114
 115 struct usb251xb {
 116         struct device *dev;
 117         struct i2c_client *i2c;
 118         u8 skip_config;
 119         struct gpio_desc *gpio_reset;
 120         u16 vendor_id;
 121         u16 product_id;
 122         u16 device_id;
 123         u8  conf_data1;
 124         u8  conf_data2;
 125         u8  conf_data3;
 126         u8  non_rem_dev;
 127         u8  port_disable_sp;
 128         u8  port_disable_bp;
 129         u8  max_power_sp;
 130         u8  max_power_bp;
 131         u8  max_current_sp;
 132         u8  max_current_bp;
 133         u8  power_on_time;
 134         u16 lang_id;
 135         u8 manufacturer_len;
 136         u8 product_len;
 137         u8 serial_len;
 138         char manufacturer[USB251XB_STRING_BUFSIZE];
 139         char product[USB251XB_STRING_BUFSIZE];
 140         char serial[USB251XB_STRING_BUFSIZE];
 141         u8  bat_charge_en;
 142         u8  boost_up;
 143         u8  boost_57;
 144         u8  boost_14;
 145         u8  port_swap;
 146         u8  port_map12;
 147         u8  port_map34;
 148         u8  port_map56;
 149         u8  port_map7;
 150         u8  status;
 151 };
 152
 153 struct usb251xb_data {
 154         u16 product_id;
 155         u8 port_cnt;
 156         bool led_support;
 157         bool bat_support;
 158         char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
 159 };
 160
 161 static const struct usb251xb_data usb2512b_data = {
 162         .product_id = 0x2512,
 163         .port_cnt = 2,
 164         .led_support = false,
 165         .bat_support = true,
 166         .product_str = "USB2512B",
 167 };
 168
 169 static const struct usb251xb_data usb2512bi_data = {
 170         .product_id = 0x2512,
 171         .port_cnt = 2,
 172         .led_support = false,
 173         .bat_support = true,
 174         .product_str = "USB2512Bi",
 175 };
 176
 177 static const struct usb251xb_data usb2513b_data = {
 178         .product_id = 0x2513,
 179         .port_cnt = 3,
 180         .led_support = false,
 181         .bat_support = true,
 182         .product_str = "USB2513B",
 183 };
 184
 185 static const struct usb251xb_data usb2513bi_data = {
 186         .product_id = 0x2513,
 187         .port_cnt = 3,
 188         .led_support = false,
 189         .bat_support = true,
 190         .product_str = "USB2513Bi",
 191 };
 192
 193 static const struct usb251xb_data usb2514b_data = {
 194         .product_id = 0x2514,
 195         .port_cnt = 4,
 196         .led_support = false,
 197         .bat_support = true,
 198         .product_str = "USB2514B",
 199 };
 200
 201 static const struct usb251xb_data usb2514bi_data = {
 202         .product_id = 0x2514,
 203         .port_cnt = 4,
 204         .led_support = false,
 205         .bat_support = true,
 206         .product_str = "USB2514Bi",
 207 };
 208
 209 static const struct usb251xb_data usb2517_data = {
 210         .product_id = 0x2517,
 211         .port_cnt = 7,
 212         .led_support = true,
 213         .bat_support = false,
 214         .product_str = "USB2517",
 215 };
 216
 217 static const struct usb251xb_data usb2517i_data = {
 218         .product_id = 0x2517,
 219         .port_cnt = 7,
 220         .led_support = true,
 221         .bat_support = false,
 222         .product_str = "USB2517i",
 223 };
 224
 225 static void usb251xb_reset(struct usb251xb *hub, int state)
 226 {
 227         if (!hub->gpio_reset)
 228                 return;
 229
 230         gpiod_set_value_cansleep(hub->gpio_reset, state);
 231
 232         /* wait for hub recovery/stabilization */
 233         if (!state)
 234                 usleep_range(500, 750); /* >=500us at power on */
 235         else
 236                 usleep_range(1, 10);    /* >=1us at power down */
 237 }
 238
 239 static int usb251xb_connect(struct usb251xb *hub)
 240 {
 241         struct device *dev = hub->dev;
 242         int err, i;
 243         char i2c_wb[USB251XB_I2C_REG_SZ];
 244
 245         memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);
 246
 247         if (hub->skip_config) {
 248                 dev_info(dev, "Skip hub configuration, only attach.\n");
 249                 i2c_wb[0] = 0x01;
 250                 i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;
 251
 252                 usb251xb_reset(hub, 0);
 253
 254                 err = i2c_smbus_write_i2c_block_data(hub->i2c,
 255                                 USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
 256                 if (err) {
 257                         dev_err(dev, "attaching hub failed: %d\n", err);
 258                         return err;
 259                 }
 260                 return 0;
 261         }
 262
 263         i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB]     = (hub->vendor_id >> 8) & 0xFF;
 264         i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB]     = hub->vendor_id & 0xFF;
 265         i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB]    = (hub->product_id >> 8) & 0xFF;
 266         i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB]    = hub->product_id & 0xFF;
 267         i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB]     = (hub->device_id >> 8) & 0xFF;
 268         i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB]     = hub->device_id & 0xFF;
 269         i2c_wb[USB251XB_ADDR_CONFIG_DATA_1]     = hub->conf_data1;
 270         i2c_wb[USB251XB_ADDR_CONFIG_DATA_2]     = hub->conf_data2;
 271         i2c_wb[USB251XB_ADDR_CONFIG_DATA_3]     = hub->conf_data3;
 272         i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
 273         i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
 274         i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS]  = hub->port_disable_bp;
 275         i2c_wb[USB251XB_ADDR_MAX_POWER_SELF]    = hub->max_power_sp;
 276         i2c_wb[USB251XB_ADDR_MAX_POWER_BUS]     = hub->max_power_bp;
 277         i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF]  = hub->max_current_sp;
 278         i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS]   = hub->max_current_bp;
 279         i2c_wb[USB251XB_ADDR_POWER_ON_TIME]     = hub->power_on_time;
 280         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH]  = (hub->lang_id >> 8) & 0xFF;
 281         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW]   = hub->lang_id & 0xFF;
 282         i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
 283         i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN]      = hub->product_len;
 284         i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN]       = hub->serial_len;
 285         memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
 286                USB251XB_STRING_BUFSIZE);
 287         memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
 288                USB251XB_STRING_BUFSIZE);
 289         memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
 290                USB251XB_STRING_BUFSIZE);
 291         i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
 292         i2c_wb[USB251XB_ADDR_BOOST_UP]          = hub->boost_up;
 293         i2c_wb[USB251XB_ADDR_BOOST_57]          = hub->boost_57;
 294         i2c_wb[USB251XB_ADDR_BOOST_14]          = hub->boost_14;
 295         i2c_wb[USB251XB_ADDR_PORT_SWAP]         = hub->port_swap;
 296         i2c_wb[USB251XB_ADDR_PORT_MAP_12]       = hub->port_map12;
 297         i2c_wb[USB251XB_ADDR_PORT_MAP_34]       = hub->port_map34;
 298         i2c_wb[USB251XB_ADDR_PORT_MAP_56]       = hub->port_map56;
 299         i2c_wb[USB251XB_ADDR_PORT_MAP_7]        = hub->port_map7;
 300         i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;
 301
 302         usb251xb_reset(hub, 0);
 303
 304         /* write registers */
 305         for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
 306                 int offset = i * USB251XB_I2C_WRITE_SZ;
 307                 char wbuf[USB251XB_I2C_WRITE_SZ + 1];
 308
 309                 /* The first data byte transferred tells the hub how many data
 310                  * bytes will follow (byte count).
 311                  */
 312                 wbuf[0] = USB251XB_I2C_WRITE_SZ;
 313                 memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);
 314
 315                 dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
 316                         USB251XB_I2C_WRITE_SZ, i, offset);
 317
 318                 err = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
 319                                                      USB251XB_I2C_WRITE_SZ + 1,
 320                                                      wbuf);
 321                 if (err)
 322                         goto out_err;
 323         }
 324
 325         dev_info(dev, "Hub configuration was successful.\n");
 326         return 0;
 327
 328 out_err:
 329         dev_err(dev, "configuring block %d failed: %d\n", i, err);
 330         return err;
 331 }
 332
 333 #ifdef CONFIG_OF
 334 static int usb251xb_get_ofdata(struct usb251xb *hub,
 335                                struct usb251xb_data *data)
 336 {
 337         struct device *dev = hub->dev;
 338         struct device_node *np = dev->of_node;
 339         int len, err, i;
 340         u32 property_u32 = 0;
 341         const u32 *cproperty_u32;
 342         const char *cproperty_char;
 343         char str[USB251XB_STRING_BUFSIZE / 2];
 344
 345         if (!np) {
 346                 dev_err(dev, "failed to get ofdata\n");
 347                 return -ENODEV;
 348         }
 349
 350         if (of_get_property(np, "skip-config", NULL))
 351                 hub->skip_config = 1;
 352         else
 353                 hub->skip_config = 0;
 354
 355         hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 356         if (PTR_ERR(hub->gpio_reset) == -EPROBE_DEFER) {
 357                 return -EPROBE_DEFER;
 358         } else if (IS_ERR(hub->gpio_reset)) {
 359                 err = PTR_ERR(hub->gpio_reset);
 360                 dev_err(dev, "unable to request GPIO reset pin (%d)\n", err);
 361                 return err;
 362         }
 363
 364         if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
 365                 hub->vendor_id = USB251XB_DEF_VENDOR_ID;
 366
 367         if (of_property_read_u16_array(np, "product-id",
 368                                        &hub->product_id, 1))
 369                 hub->product_id = data->product_id;
 370
 371         if (of_property_read_u16_array(np, "device-id", &hub->device_id, 1))
 372                 hub->device_id = USB251XB_DEF_DEVICE_ID;
 373
 374         hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
 375         if (of_get_property(np, "self-powered", NULL)) {
 376                 hub->conf_data1 |= BIT(7);
 377
 378                 /* Configure Over-Current sens when self-powered */
 379                 hub->conf_data1 &= ~BIT(2);
 380                 if (of_get_property(np, "ganged-sensing", NULL))
 381                         hub->conf_data1 &= ~BIT(1);
 382                 else if (of_get_property(np, "individual-sensing", NULL))
 383                         hub->conf_data1 |= BIT(1);
 384         } else if (of_get_property(np, "bus-powered", NULL)) {
 385                 hub->conf_data1 &= ~BIT(7);
 386
 387                 /* Disable Over-Current sense when bus-powered */
 388                 hub->conf_data1 |= BIT(2);
 389         }
 390
 391         if (of_get_property(np, "disable-hi-speed", NULL))
 392                 hub->conf_data1 |= BIT(5);
 393
 394         if (of_get_property(np, "multi-tt", NULL))
 395                 hub->conf_data1 |= BIT(4);
 396         else if (of_get_property(np, "single-tt", NULL))
 397                 hub->conf_data1 &= ~BIT(4);
 398
 399         if (of_get_property(np, "disable-eop", NULL))
 400                 hub->conf_data1 |= BIT(3);
 401
 402         if (of_get_property(np, "individual-port-switching", NULL))
 403                 hub->conf_data1 |= BIT(0);
 404         else if (of_get_property(np, "ganged-port-switching", NULL))
 405                 hub->conf_data1 &= ~BIT(0);
 406
 407         hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
 408         if (of_get_property(np, "dynamic-power-switching", NULL))
 409                 hub->conf_data2 |= BIT(7);
 410
 411         if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) {
 412                 if (property_u32 == 100) {
 413                         /* 100 us*/
 414                         hub->conf_data2 &= ~BIT(5);
 415                         hub->conf_data2 &= ~BIT(4);
 416                 } else if (property_u32 == 4000) {
 417                         /* 4 ms */
 418                         hub->conf_data2 &= ~BIT(5);
 419                         hub->conf_data2 |= BIT(4);
 420                 } else if (property_u32 == 16000) {
 421                         /* 16 ms */
 422                         hub->conf_data2 |= BIT(5);
 423                         hub->conf_data2 |= BIT(4);
 424                 } else {
 425                         /* 8 ms (DEFAULT) */
 426                         hub->conf_data2 |= BIT(5);
 427                         hub->conf_data2 &= ~BIT(4);
 428                 }
 429         }
 430
 431         if (of_get_property(np, "compound-device", NULL))
 432                 hub->conf_data2 |= BIT(3);
 433
 434         hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
 435         if (of_get_property(np, "port-mapping-mode", NULL))
 436                 hub->conf_data3 |= BIT(3);
 437
 438         if (data->led_support && of_get_property(np, "led-usb-mode", NULL))
 439                 hub->conf_data3 &= ~BIT(1);
 440
 441         if (of_get_property(np, "string-support", NULL))
 442                 hub->conf_data3 |= BIT(0);
 443
 444         hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
 445         cproperty_u32 = of_get_property(np, "non-removable-ports", &len);
 446         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 447                 for (i = 0; i < len / sizeof(u32); i++) {
 448                         u32 port = be32_to_cpu(cproperty_u32[i]);
 449
 450                         if ((port >= 1) && (port <= data->port_cnt))
 451                                 hub->non_rem_dev |= BIT(port);
 452                         else
 453                                 dev_warn(dev, "NRD port %u doesn't exist\n",
 454                                         port);
 455                 }
 456         }
 457
 458         hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
 459         cproperty_u32 = of_get_property(np, "sp-disabled-ports", &len);
 460         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 461                 for (i = 0; i < len / sizeof(u32); i++) {
 462                         u32 port = be32_to_cpu(cproperty_u32[i]);
 463
 464                         if ((port >= 1) && (port <= data->port_cnt))
 465                                 hub->port_disable_sp |= BIT(port);
 466                         else
 467                                 dev_warn(dev, "PDS port %u doesn't exist\n",
 468                                         port);
 469                 }
 470         }
 471
 472         hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
 473         cproperty_u32 = of_get_property(np, "bp-disabled-ports", &len);
 474         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 475                 for (i = 0; i < len / sizeof(u32); i++) {
 476                         u32 port = be32_to_cpu(cproperty_u32[i]);
 477
 478                         if ((port >= 1) && (port <= data->port_cnt))
 479                                 hub->port_disable_bp |= BIT(port);
 480                         else
 481                                 dev_warn(dev, "PDB port %u doesn't exist\n",
 482                                         port);
 483                 }
 484         }
 485
 486         hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
 487         if (!of_property_read_u32(np, "sp-max-total-current-microamp",
 488             &property_u32))
 489                 hub->max_power_sp = min_t(u8, property_u32 / 2000, 50);
 490
 491         hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
 492         if (!of_property_read_u32(np, "bp-max-total-current-microamp",
 493             &property_u32))
 494                 hub->max_power_bp = min_t(u8, property_u32 / 2000, 255);
 495
 496         hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
 497         if (!of_property_read_u32(np, "sp-max-removable-current-microamp",
 498             &property_u32))
 499                 hub->max_current_sp = min_t(u8, property_u32 / 2000, 50);
 500
 501         hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
 502         if (!of_property_read_u32(np, "bp-max-removable-current-microamp",
 503             &property_u32))
 504                 hub->max_current_bp = min_t(u8, property_u32 / 2000, 255);
 505
 506         hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
 507         if (!of_property_read_u32(np, "power-on-time-ms", &property_u32))
 508                 hub->power_on_time = min_t(u8, property_u32 / 2, 255);
 509
 510         if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
 511                 hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
 512
 513         cproperty_char = of_get_property(np, "manufacturer", NULL);
 514         strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
 515                 sizeof(str));
 516         hub->manufacturer_len = strlen(str) & 0xFF;
 517         memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
 518         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 519         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 520                               (wchar_t *)hub->manufacturer,
 521                               USB251XB_STRING_BUFSIZE);
 522
 523         cproperty_char = of_get_property(np, "product", NULL);
 524         strlcpy(str, cproperty_char ? : data->product_str, sizeof(str));
 525         hub->product_len = strlen(str) & 0xFF;
 526         memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
 527         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 528         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 529                               (wchar_t *)hub->product,
 530                               USB251XB_STRING_BUFSIZE);
 531
 532         cproperty_char = of_get_property(np, "serial", NULL);
 533         strlcpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
 534                 sizeof(str));
 535         hub->serial_len = strlen(str) & 0xFF;
 536         memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
 537         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 538         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 539                               (wchar_t *)hub->serial,
 540                               USB251XB_STRING_BUFSIZE);
 541
 542         /* The following parameters are currently not exposed to devicetree, but
 543          * may be as soon as needed.
 544          */
 545         hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
 546         hub->boost_up = USB251XB_DEF_BOOST_UP;
 547         hub->boost_57 = USB251XB_DEF_BOOST_57;
 548         hub->boost_14 = USB251XB_DEF_BOOST_14;
 549         hub->port_swap = USB251XB_DEF_PORT_SWAP;
 550         hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
 551         hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
 552         hub->port_map56 = USB251XB_DEF_PORT_MAP_56;
 553         hub->port_map7  = USB251XB_DEF_PORT_MAP_7;
 554
 555         return 0;
 556 }
 557
 558 static const struct of_device_id usb251xb_of_match[] = {
 559         {
 560                 .compatible = "microchip,usb2512b",
 561                 .data = &usb2512b_data,
 562         }, {
 563                 .compatible = "microchip,usb2512bi",
 564                 .data = &usb2512bi_data,
 565         }, {
 566                 .compatible = "microchip,usb2513b",
 567                 .data = &usb2513b_data,
 568         }, {
 569                 .compatible = "microchip,usb2513bi",
 570                 .data = &usb2513bi_data,
 571         }, {
 572                 .compatible = "microchip,usb2514b",
 573                 .data = &usb2514b_data,
 574         }, {
 575                 .compatible = "microchip,usb2514bi",
 576                 .data = &usb2514bi_data,
 577         }, {
 578                 .compatible = "microchip,usb2517",
 579                 .data = &usb2517_data,
 580         }, {
 581                 .compatible = "microchip,usb2517i",
 582                 .data = &usb2517i_data,
 583         }, {
 584                 /* sentinel */
 585         }
 586 };
 587 MODULE_DEVICE_TABLE(of, usb251xb_of_match);
 588 #else /* CONFIG_OF */
 589 static int usb251xb_get_ofdata(struct usb251xb *hub,
 590                                struct usb251xb_data *data)
 591 {
 592         return 0;
 593 }
 594 #endif /* CONFIG_OF */
 595
 596 static int usb251xb_probe(struct usb251xb *hub)
 597 {
 598         struct device *dev = hub->dev;
 599         struct device_node *np = dev->of_node;
 600         const struct of_device_id *of_id = of_match_device(usb251xb_of_match,
 601                                                            dev);
 602         int err;
 603
 604         if (np) {
 605                 err = usb251xb_get_ofdata(hub,
 606                                           (struct usb251xb_data *)of_id->data);
 607                 if (err) {
 608                         dev_err(dev, "failed to get ofdata: %d\n", err);
 609                         return err;
 610                 }
 611         }
 612
 613         err = usb251xb_connect(hub);
 614         if (err) {
 615                 dev_err(dev, "Failed to connect hub (%d)\n", err);
 616                 return err;
 617         }
 618
 619         dev_info(dev, "Hub probed successfully\n");
 620
 621         return 0;
 622 }
 623
 624 static int usb251xb_i2c_probe(struct i2c_client *i2c,
 625                               const struct i2c_device_id *id)
 626 {
 627         struct usb251xb *hub;
 628
 629         hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
 630         if (!hub)
 631                 return -ENOMEM;
 632
 633         i2c_set_clientdata(i2c, hub);
 634         hub->dev = &i2c->dev;
 635         hub->i2c = i2c;
 636
 637         return usb251xb_probe(hub);
 638 }
 639
 640 static const struct i2c_device_id usb251xb_id[] = {
 641         { "usb2512b", 0 },
 642         { "usb2512bi", 0 },
 643         { "usb2513b", 0 },
 644         { "usb2513bi", 0 },
 645         { "usb2514b", 0 },
 646         { "usb2514bi", 0 },
 647         { "usb2517", 0 },
 648         { "usb2517i", 0 },
 649         { /* sentinel */ }
 650 };
 651 MODULE_DEVICE_TABLE(i2c, usb251xb_id);
 652
 653 static struct i2c_driver usb251xb_i2c_driver = {
 654         .driver = {
 655                 .name = DRIVER_NAME,
 656                 .of_match_table = of_match_ptr(usb251xb_of_match),
 657         },
 658         .probe    = usb251xb_i2c_probe,
 659         .id_table = usb251xb_id,
 660 };
 661
 662 module_i2c_driver(usb251xb_i2c_driver);
 663
 664 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
 665 MODULE_DESCRIPTION("USB251x/xBi USB 2.0 Hub Controller Driver");
 666 MODULE_LICENSE("GPL");