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 port, property_u32 = 0;
 341         const u32 *cproperty_u32;
 342         const char *cproperty_char;
 343         char str[USB251XB_STRING_BUFSIZE / 2];
 344         struct property *prop;
 345         const __be32 *p;
 346
 347         if (!np) {
 348                 dev_err(dev, "failed to get ofdata\n");
 349                 return -ENODEV;
 350         }
 351
 352         if (of_get_property(np, "skip-config", NULL))
 353                 hub->skip_config = 1;
 354         else
 355                 hub->skip_config = 0;
 356
 357         hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 358         if (PTR_ERR(hub->gpio_reset) == -EPROBE_DEFER) {
 359                 return -EPROBE_DEFER;
 360         } else if (IS_ERR(hub->gpio_reset)) {
 361                 err = PTR_ERR(hub->gpio_reset);
 362                 dev_err(dev, "unable to request GPIO reset pin (%d)\n", err);
 363                 return err;
 364         }
 365
 366         if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
 367                 hub->vendor_id = USB251XB_DEF_VENDOR_ID;
 368
 369         if (of_property_read_u16_array(np, "product-id",
 370                                        &hub->product_id, 1))
 371                 hub->product_id = data->product_id;
 372
 373         if (of_property_read_u16_array(np, "device-id", &hub->device_id, 1))
 374                 hub->device_id = USB251XB_DEF_DEVICE_ID;
 375
 376         hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
 377         if (of_get_property(np, "self-powered", NULL)) {
 378                 hub->conf_data1 |= BIT(7);
 379
 380                 /* Configure Over-Current sens when self-powered */
 381                 hub->conf_data1 &= ~BIT(2);
 382                 if (of_get_property(np, "ganged-sensing", NULL))
 383                         hub->conf_data1 &= ~BIT(1);
 384                 else if (of_get_property(np, "individual-sensing", NULL))
 385                         hub->conf_data1 |= BIT(1);
 386         } else if (of_get_property(np, "bus-powered", NULL)) {
 387                 hub->conf_data1 &= ~BIT(7);
 388
 389                 /* Disable Over-Current sense when bus-powered */
 390                 hub->conf_data1 |= BIT(2);
 391         }
 392
 393         if (of_get_property(np, "disable-hi-speed", NULL))
 394                 hub->conf_data1 |= BIT(5);
 395
 396         if (of_get_property(np, "multi-tt", NULL))
 397                 hub->conf_data1 |= BIT(4);
 398         else if (of_get_property(np, "single-tt", NULL))
 399                 hub->conf_data1 &= ~BIT(4);
 400
 401         if (of_get_property(np, "disable-eop", NULL))
 402                 hub->conf_data1 |= BIT(3);
 403
 404         if (of_get_property(np, "individual-port-switching", NULL))
 405                 hub->conf_data1 |= BIT(0);
 406         else if (of_get_property(np, "ganged-port-switching", NULL))
 407                 hub->conf_data1 &= ~BIT(0);
 408
 409         hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
 410         if (of_get_property(np, "dynamic-power-switching", NULL))
 411                 hub->conf_data2 |= BIT(7);
 412
 413         if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) {
 414                 if (property_u32 == 100) {
 415                         /* 100 us*/
 416                         hub->conf_data2 &= ~BIT(5);
 417                         hub->conf_data2 &= ~BIT(4);
 418                 } else if (property_u32 == 4000) {
 419                         /* 4 ms */
 420                         hub->conf_data2 &= ~BIT(5);
 421                         hub->conf_data2 |= BIT(4);
 422                 } else if (property_u32 == 16000) {
 423                         /* 16 ms */
 424                         hub->conf_data2 |= BIT(5);
 425                         hub->conf_data2 |= BIT(4);
 426                 } else {
 427                         /* 8 ms (DEFAULT) */
 428                         hub->conf_data2 |= BIT(5);
 429                         hub->conf_data2 &= ~BIT(4);
 430                 }
 431         }
 432
 433         if (of_get_property(np, "compound-device", NULL))
 434                 hub->conf_data2 |= BIT(3);
 435
 436         hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
 437         if (of_get_property(np, "port-mapping-mode", NULL))
 438                 hub->conf_data3 |= BIT(3);
 439
 440         if (data->led_support && of_get_property(np, "led-usb-mode", NULL))
 441                 hub->conf_data3 &= ~BIT(1);
 442
 443         if (of_get_property(np, "string-support", NULL))
 444                 hub->conf_data3 |= BIT(0);
 445
 446         hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
 447         cproperty_u32 = of_get_property(np, "non-removable-ports", &len);
 448         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 449                 for (i = 0; i < len / sizeof(u32); i++) {
 450                         u32 port = be32_to_cpu(cproperty_u32[i]);
 451
 452                         if ((port >= 1) && (port <= data->port_cnt))
 453                                 hub->non_rem_dev |= BIT(port);
 454                         else
 455                                 dev_warn(dev, "NRD port %u doesn't exist\n",
 456                                         port);
 457                 }
 458         }
 459
 460         hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
 461         cproperty_u32 = of_get_property(np, "sp-disabled-ports", &len);
 462         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 463                 for (i = 0; i < len / sizeof(u32); i++) {
 464                         u32 port = be32_to_cpu(cproperty_u32[i]);
 465
 466                         if ((port >= 1) && (port <= data->port_cnt))
 467                                 hub->port_disable_sp |= BIT(port);
 468                         else
 469                                 dev_warn(dev, "PDS port %u doesn't exist\n",
 470                                         port);
 471                 }
 472         }
 473
 474         hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
 475         cproperty_u32 = of_get_property(np, "bp-disabled-ports", &len);
 476         if (cproperty_u32 && (len / sizeof(u32)) > 0) {
 477                 for (i = 0; i < len / sizeof(u32); i++) {
 478                         u32 port = be32_to_cpu(cproperty_u32[i]);
 479
 480                         if ((port >= 1) && (port <= data->port_cnt))
 481                                 hub->port_disable_bp |= BIT(port);
 482                         else
 483                                 dev_warn(dev, "PDB port %u doesn't exist\n",
 484                                         port);
 485                 }
 486         }
 487
 488         hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
 489         if (!of_property_read_u32(np, "sp-max-total-current-microamp",
 490             &property_u32))
 491                 hub->max_power_sp = min_t(u8, property_u32 / 2000, 50);
 492
 493         hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
 494         if (!of_property_read_u32(np, "bp-max-total-current-microamp",
 495             &property_u32))
 496                 hub->max_power_bp = min_t(u8, property_u32 / 2000, 255);
 497
 498         hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
 499         if (!of_property_read_u32(np, "sp-max-removable-current-microamp",
 500             &property_u32))
 501                 hub->max_current_sp = min_t(u8, property_u32 / 2000, 50);
 502
 503         hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
 504         if (!of_property_read_u32(np, "bp-max-removable-current-microamp",
 505             &property_u32))
 506                 hub->max_current_bp = min_t(u8, property_u32 / 2000, 255);
 507
 508         hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
 509         if (!of_property_read_u32(np, "power-on-time-ms", &property_u32))
 510                 hub->power_on_time = min_t(u8, property_u32 / 2, 255);
 511
 512         if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
 513                 hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
 514
 515         cproperty_char = of_get_property(np, "manufacturer", NULL);
 516         strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
 517                 sizeof(str));
 518         hub->manufacturer_len = strlen(str) & 0xFF;
 519         memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
 520         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 521         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 522                               (wchar_t *)hub->manufacturer,
 523                               USB251XB_STRING_BUFSIZE);
 524
 525         cproperty_char = of_get_property(np, "product", NULL);
 526         strlcpy(str, cproperty_char ? : data->product_str, sizeof(str));
 527         hub->product_len = strlen(str) & 0xFF;
 528         memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
 529         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 530         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 531                               (wchar_t *)hub->product,
 532                               USB251XB_STRING_BUFSIZE);
 533
 534         cproperty_char = of_get_property(np, "serial", NULL);
 535         strlcpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
 536                 sizeof(str));
 537         hub->serial_len = strlen(str) & 0xFF;
 538         memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
 539         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 540         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 541                               (wchar_t *)hub->serial,
 542                               USB251XB_STRING_BUFSIZE);
 543
 544         /*
 545          * The datasheet documents the register as 'Port Swap' but in real the
 546          * register controls the USB DP/DM signal swapping for each port.
 547          */
 548         hub->port_swap = USB251XB_DEF_PORT_SWAP;
 549         of_property_for_each_u32(np, "swap-dx-lanes", prop, p, port) {
 550                 if (port <= data->port_cnt)
 551                         hub->port_swap |= BIT(port);
 552         }
 553
 554         /* The following parameters are currently not exposed to devicetree, but
 555          * may be as soon as needed.
 556          */
 557         hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
 558         hub->boost_up = USB251XB_DEF_BOOST_UP;
 559         hub->boost_57 = USB251XB_DEF_BOOST_57;
 560         hub->boost_14 = USB251XB_DEF_BOOST_14;
 561         hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
 562         hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
 563         hub->port_map56 = USB251XB_DEF_PORT_MAP_56;
 564         hub->port_map7  = USB251XB_DEF_PORT_MAP_7;
 565
 566         return 0;
 567 }
 568
 569 static const struct of_device_id usb251xb_of_match[] = {
 570         {
 571                 .compatible = "microchip,usb2512b",
 572                 .data = &usb2512b_data,
 573         }, {
 574                 .compatible = "microchip,usb2512bi",
 575                 .data = &usb2512bi_data,
 576         }, {
 577                 .compatible = "microchip,usb2513b",
 578                 .data = &usb2513b_data,
 579         }, {
 580                 .compatible = "microchip,usb2513bi",
 581                 .data = &usb2513bi_data,
 582         }, {
 583                 .compatible = "microchip,usb2514b",
 584                 .data = &usb2514b_data,
 585         }, {
 586                 .compatible = "microchip,usb2514bi",
 587                 .data = &usb2514bi_data,
 588         }, {
 589                 .compatible = "microchip,usb2517",
 590                 .data = &usb2517_data,
 591         }, {
 592                 .compatible = "microchip,usb2517i",
 593                 .data = &usb2517i_data,
 594         }, {
 595                 /* sentinel */
 596         }
 597 };
 598 MODULE_DEVICE_TABLE(of, usb251xb_of_match);
 599 #else /* CONFIG_OF */
 600 static int usb251xb_get_ofdata(struct usb251xb *hub,
 601                                struct usb251xb_data *data)
 602 {
 603         return 0;
 604 }
 605 #endif /* CONFIG_OF */
 606
 607 static int usb251xb_probe(struct usb251xb *hub)
 608 {
 609         struct device *dev = hub->dev;
 610         struct device_node *np = dev->of_node;
 611         const struct of_device_id *of_id = of_match_device(usb251xb_of_match,
 612                                                            dev);
 613         int err;
 614
 615         if (np && of_id) {
 616                 err = usb251xb_get_ofdata(hub,
 617                                           (struct usb251xb_data *)of_id->data);
 618                 if (err) {
 619                         dev_err(dev, "failed to get ofdata: %d\n", err);
 620                         return err;
 621                 }
 622         }
 623
 624         err = usb251xb_connect(hub);
 625         if (err) {
 626                 dev_err(dev, "Failed to connect hub (%d)\n", err);
 627                 return err;
 628         }
 629
 630         dev_info(dev, "Hub probed successfully\n");
 631
 632         return 0;
 633 }
 634
 635 static int usb251xb_i2c_probe(struct i2c_client *i2c,
 636                               const struct i2c_device_id *id)
 637 {
 638         struct usb251xb *hub;
 639
 640         hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
 641         if (!hub)
 642                 return -ENOMEM;
 643
 644         i2c_set_clientdata(i2c, hub);
 645         hub->dev = &i2c->dev;
 646         hub->i2c = i2c;
 647
 648         return usb251xb_probe(hub);
 649 }
 650
 651 static const struct i2c_device_id usb251xb_id[] = {
 652         { "usb2512b", 0 },
 653         { "usb2512bi", 0 },
 654         { "usb2513b", 0 },
 655         { "usb2513bi", 0 },
 656         { "usb2514b", 0 },
 657         { "usb2514bi", 0 },
 658         { "usb2517", 0 },
 659         { "usb2517i", 0 },
 660         { /* sentinel */ }
 661 };
 662 MODULE_DEVICE_TABLE(i2c, usb251xb_id);
 663
 664 static struct i2c_driver usb251xb_i2c_driver = {
 665         .driver = {
 666                 .name = DRIVER_NAME,
 667                 .of_match_table = of_match_ptr(usb251xb_of_match),
 668         },
 669         .probe    = usb251xb_i2c_probe,
 670         .id_table = usb251xb_id,
 671 };
 672
 673 module_i2c_driver(usb251xb_i2c_driver);
 674
 675 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
 676 MODULE_DESCRIPTION("USB251x/xBi USB 2.0 Hub Controller Driver");
 677 MODULE_LICENSE("GPL");