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/gpio/driver.h>
  16 #include <linux/i2c.h>
  17 #include <linux/module.h>
  18 #include <linux/nls.h>
  19 #include <linux/of.h>
  20 #include <linux/regulator/consumer.h>
  21 #include <linux/slab.h>
  22
  23 /* Internal Register Set Addresses & Default Values acc. to DS00001692C */
  24 #define USB251XB_ADDR_VENDOR_ID_LSB     0x00
  25 #define USB251XB_ADDR_VENDOR_ID_MSB     0x01
  26 #define USB251XB_DEF_VENDOR_ID          0x0424
  27
  28 #define USB251XB_ADDR_PRODUCT_ID_LSB    0x02
  29 #define USB251XB_ADDR_PRODUCT_ID_MSB    0x03
  30
  31 #define USB251XB_ADDR_DEVICE_ID_LSB     0x04
  32 #define USB251XB_ADDR_DEVICE_ID_MSB     0x05
  33 #define USB251XB_DEF_DEVICE_ID          0x0BB3
  34
  35 #define USB251XB_ADDR_CONFIG_DATA_1     0x06
  36 #define USB251XB_DEF_CONFIG_DATA_1      0x9B
  37 #define USB251XB_ADDR_CONFIG_DATA_2     0x07
  38 #define USB251XB_DEF_CONFIG_DATA_2      0x20
  39 #define USB251XB_ADDR_CONFIG_DATA_3     0x08
  40 #define USB251XB_DEF_CONFIG_DATA_3      0x02
  41
  42 #define USB251XB_ADDR_NON_REMOVABLE_DEVICES     0x09
  43 #define USB251XB_DEF_NON_REMOVABLE_DEVICES      0x00
  44
  45 #define USB251XB_ADDR_PORT_DISABLE_SELF 0x0A
  46 #define USB251XB_DEF_PORT_DISABLE_SELF  0x00
  47 #define USB251XB_ADDR_PORT_DISABLE_BUS  0x0B
  48 #define USB251XB_DEF_PORT_DISABLE_BUS   0x00
  49
  50 #define USB251XB_ADDR_MAX_POWER_SELF    0x0C
  51 #define USB251XB_DEF_MAX_POWER_SELF     0x01
  52 #define USB251XB_ADDR_MAX_POWER_BUS     0x0D
  53 #define USB251XB_DEF_MAX_POWER_BUS      0x32
  54
  55 #define USB251XB_ADDR_MAX_CURRENT_SELF  0x0E
  56 #define USB251XB_DEF_MAX_CURRENT_SELF   0x01
  57 #define USB251XB_ADDR_MAX_CURRENT_BUS   0x0F
  58 #define USB251XB_DEF_MAX_CURRENT_BUS    0x32
  59
  60 #define USB251XB_ADDR_POWER_ON_TIME     0x10
  61 #define USB251XB_DEF_POWER_ON_TIME      0x32
  62
  63 #define USB251XB_ADDR_LANGUAGE_ID_HIGH  0x11
  64 #define USB251XB_ADDR_LANGUAGE_ID_LOW   0x12
  65 #define USB251XB_DEF_LANGUAGE_ID        0x0000
  66
  67 #define USB251XB_STRING_BUFSIZE                 62
  68 #define USB251XB_ADDR_MANUFACTURER_STRING_LEN   0x13
  69 #define USB251XB_ADDR_MANUFACTURER_STRING       0x16
  70 #define USB251XB_DEF_MANUFACTURER_STRING        "Microchip"
  71
  72 #define USB251XB_ADDR_PRODUCT_STRING_LEN        0x14
  73 #define USB251XB_ADDR_PRODUCT_STRING            0x54
  74
  75 #define USB251XB_ADDR_SERIAL_STRING_LEN         0x15
  76 #define USB251XB_ADDR_SERIAL_STRING             0x92
  77 #define USB251XB_DEF_SERIAL_STRING              ""
  78
  79 #define USB251XB_ADDR_BATTERY_CHARGING_ENABLE   0xD0
  80 #define USB251XB_DEF_BATTERY_CHARGING_ENABLE    0x00
  81
  82 #define USB251XB_ADDR_BOOST_UP  0xF6
  83 #define USB251XB_DEF_BOOST_UP   0x00
  84 #define USB251XB_ADDR_BOOST_57  0xF7
  85 #define USB251XB_DEF_BOOST_57   0x00
  86 #define USB251XB_ADDR_BOOST_14  0xF8
  87 #define USB251XB_DEF_BOOST_14   0x00
  88
  89 #define USB251XB_ADDR_PORT_SWAP 0xFA
  90 #define USB251XB_DEF_PORT_SWAP  0x00
  91
  92 #define USB251XB_ADDR_PORT_MAP_12       0xFB
  93 #define USB251XB_DEF_PORT_MAP_12        0x00
  94 #define USB251XB_ADDR_PORT_MAP_34       0xFC
  95 #define USB251XB_DEF_PORT_MAP_34        0x00 /* USB251{3B/i,4B/i,7/i} only */
  96 #define USB251XB_ADDR_PORT_MAP_56       0xFD
  97 #define USB251XB_DEF_PORT_MAP_56        0x00 /* USB2517/i only */
  98 #define USB251XB_ADDR_PORT_MAP_7        0xFE
  99 #define USB251XB_DEF_PORT_MAP_7         0x00 /* USB2517/i only */
 100
 101 #define USB251XB_ADDR_STATUS_COMMAND            0xFF
 102 #define USB251XB_STATUS_COMMAND_SMBUS_DOWN      0x04
 103 #define USB251XB_STATUS_COMMAND_RESET           0x02
 104 #define USB251XB_STATUS_COMMAND_ATTACH          0x01
 105
 106 #define USB251XB_I2C_REG_SZ     0x100
 107 #define USB251XB_I2C_WRITE_SZ   0x10
 108
 109 #define DRIVER_NAME     "usb251xb"
 110 #define DRIVER_DESC     "Microchip USB 2.0 Hi-Speed Hub Controller"
 111
 112 struct usb251xb {
 113         struct device *dev;
 114         struct i2c_client *i2c;
 115         struct regulator *vdd;
 116         u8 skip_config;
 117         struct gpio_desc *gpio_reset;
 118         u16 vendor_id;
 119         u16 product_id;
 120         u16 device_id;
 121         u8  conf_data1;
 122         u8  conf_data2;
 123         u8  conf_data3;
 124         u8  non_rem_dev;
 125         u8  port_disable_sp;
 126         u8  port_disable_bp;
 127         u8  max_power_sp;
 128         u8  max_power_bp;
 129         u8  max_current_sp;
 130         u8  max_current_bp;
 131         u8  power_on_time;
 132         u16 lang_id;
 133         u8 manufacturer_len;
 134         u8 product_len;
 135         u8 serial_len;
 136         char manufacturer[USB251XB_STRING_BUFSIZE];
 137         char product[USB251XB_STRING_BUFSIZE];
 138         char serial[USB251XB_STRING_BUFSIZE];
 139         u8  bat_charge_en;
 140         u8  boost_up;
 141         u8  boost_57;
 142         u8  boost_14;
 143         u8  port_swap;
 144         u8  port_map12;
 145         u8  port_map34;
 146         u8  port_map56;
 147         u8  port_map7;
 148         u8  status;
 149 };
 150
 151 struct usb251xb_data {
 152         u16 product_id;
 153         u8 port_cnt;
 154         bool led_support;
 155         bool bat_support;
 156         char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
 157 };
 158
 159 static const struct usb251xb_data usb2422_data = {
 160         .product_id = 0x2422,
 161         .port_cnt = 2,
 162         .led_support = false,
 163         .bat_support = true,
 164         .product_str = "USB2422",
 165 };
 166
 167 static const struct usb251xb_data usb2512b_data = {
 168         .product_id = 0x2512,
 169         .port_cnt = 2,
 170         .led_support = false,
 171         .bat_support = true,
 172         .product_str = "USB2512B",
 173 };
 174
 175 static const struct usb251xb_data usb2512bi_data = {
 176         .product_id = 0x2512,
 177         .port_cnt = 2,
 178         .led_support = false,
 179         .bat_support = true,
 180         .product_str = "USB2512Bi",
 181 };
 182
 183 static const struct usb251xb_data usb2513b_data = {
 184         .product_id = 0x2513,
 185         .port_cnt = 3,
 186         .led_support = false,
 187         .bat_support = true,
 188         .product_str = "USB2513B",
 189 };
 190
 191 static const struct usb251xb_data usb2513bi_data = {
 192         .product_id = 0x2513,
 193         .port_cnt = 3,
 194         .led_support = false,
 195         .bat_support = true,
 196         .product_str = "USB2513Bi",
 197 };
 198
 199 static const struct usb251xb_data usb2514b_data = {
 200         .product_id = 0x2514,
 201         .port_cnt = 4,
 202         .led_support = false,
 203         .bat_support = true,
 204         .product_str = "USB2514B",
 205 };
 206
 207 static const struct usb251xb_data usb2514bi_data = {
 208         .product_id = 0x2514,
 209         .port_cnt = 4,
 210         .led_support = false,
 211         .bat_support = true,
 212         .product_str = "USB2514Bi",
 213 };
 214
 215 static const struct usb251xb_data usb2517_data = {
 216         .product_id = 0x2517,
 217         .port_cnt = 7,
 218         .led_support = true,
 219         .bat_support = false,
 220         .product_str = "USB2517",
 221 };
 222
 223 static const struct usb251xb_data usb2517i_data = {
 224         .product_id = 0x2517,
 225         .port_cnt = 7,
 226         .led_support = true,
 227         .bat_support = false,
 228         .product_str = "USB2517i",
 229 };
 230
 231 #ifdef CONFIG_GPIOLIB
 232 static int usb251xb_check_dev_children(struct device *dev, void *child)
 233 {
 234         if (dev->type == &i2c_adapter_type) {
 235                 return device_for_each_child(dev, child,
 236                                              usb251xb_check_dev_children);
 237         }
 238
 239         return (dev == child);
 240 }
 241
 242 static int usb251x_check_gpio_chip(struct usb251xb *hub)
 243 {
 244         struct gpio_chip *gc = gpiod_to_chip(hub->gpio_reset);
 245         struct i2c_adapter *adap = hub->i2c->adapter;
 246         int ret;
 247
 248         if (!hub->gpio_reset)
 249                 return 0;
 250
 251         if (!gc)
 252                 return -EINVAL;
 253
 254         ret = usb251xb_check_dev_children(&adap->dev, gc->parent);
 255         if (ret) {
 256                 dev_err(hub->dev, "Reset GPIO chip is at the same i2c-bus\n");
 257                 return -EINVAL;
 258         }
 259
 260         return 0;
 261 }
 262 #else
 263 static int usb251x_check_gpio_chip(struct usb251xb *hub)
 264 {
 265         return 0;
 266 }
 267 #endif
 268
 269 static void usb251xb_reset(struct usb251xb *hub)
 270 {
 271         if (!hub->gpio_reset)
 272                 return;
 273
 274         i2c_lock_bus(hub->i2c->adapter, I2C_LOCK_SEGMENT);
 275
 276         gpiod_set_value_cansleep(hub->gpio_reset, 1);
 277         usleep_range(1, 10);    /* >=1us RESET_N asserted */
 278         gpiod_set_value_cansleep(hub->gpio_reset, 0);
 279
 280         /* wait for hub recovery/stabilization */
 281         usleep_range(500, 750); /* >=500us after RESET_N deasserted */
 282
 283         i2c_unlock_bus(hub->i2c->adapter, I2C_LOCK_SEGMENT);
 284 }
 285
 286 static int usb251xb_connect(struct usb251xb *hub)
 287 {
 288         struct device *dev = hub->dev;
 289         int err, i;
 290         char i2c_wb[USB251XB_I2C_REG_SZ];
 291
 292         memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);
 293
 294         if (hub->skip_config) {
 295                 dev_info(dev, "Skip hub configuration, only attach.\n");
 296                 i2c_wb[0] = 0x01;
 297                 i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;
 298
 299                 usb251xb_reset(hub);
 300
 301                 err = i2c_smbus_write_i2c_block_data(hub->i2c,
 302                                 USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
 303                 if (err) {
 304                         dev_err(dev, "attaching hub failed: %d\n", err);
 305                         return err;
 306                 }
 307                 return 0;
 308         }
 309
 310         i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB]     = (hub->vendor_id >> 8) & 0xFF;
 311         i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB]     = hub->vendor_id & 0xFF;
 312         i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB]    = (hub->product_id >> 8) & 0xFF;
 313         i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB]    = hub->product_id & 0xFF;
 314         i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB]     = (hub->device_id >> 8) & 0xFF;
 315         i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB]     = hub->device_id & 0xFF;
 316         i2c_wb[USB251XB_ADDR_CONFIG_DATA_1]     = hub->conf_data1;
 317         i2c_wb[USB251XB_ADDR_CONFIG_DATA_2]     = hub->conf_data2;
 318         i2c_wb[USB251XB_ADDR_CONFIG_DATA_3]     = hub->conf_data3;
 319         i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
 320         i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
 321         i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS]  = hub->port_disable_bp;
 322         i2c_wb[USB251XB_ADDR_MAX_POWER_SELF]    = hub->max_power_sp;
 323         i2c_wb[USB251XB_ADDR_MAX_POWER_BUS]     = hub->max_power_bp;
 324         i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF]  = hub->max_current_sp;
 325         i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS]   = hub->max_current_bp;
 326         i2c_wb[USB251XB_ADDR_POWER_ON_TIME]     = hub->power_on_time;
 327         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH]  = (hub->lang_id >> 8) & 0xFF;
 328         i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW]   = hub->lang_id & 0xFF;
 329         i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
 330         i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN]      = hub->product_len;
 331         i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN]       = hub->serial_len;
 332         memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
 333                USB251XB_STRING_BUFSIZE);
 334         memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
 335                USB251XB_STRING_BUFSIZE);
 336         memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
 337                USB251XB_STRING_BUFSIZE);
 338         i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
 339         i2c_wb[USB251XB_ADDR_BOOST_UP]          = hub->boost_up;
 340         i2c_wb[USB251XB_ADDR_BOOST_57]          = hub->boost_57;
 341         i2c_wb[USB251XB_ADDR_BOOST_14]          = hub->boost_14;
 342         i2c_wb[USB251XB_ADDR_PORT_SWAP]         = hub->port_swap;
 343         i2c_wb[USB251XB_ADDR_PORT_MAP_12]       = hub->port_map12;
 344         i2c_wb[USB251XB_ADDR_PORT_MAP_34]       = hub->port_map34;
 345         i2c_wb[USB251XB_ADDR_PORT_MAP_56]       = hub->port_map56;
 346         i2c_wb[USB251XB_ADDR_PORT_MAP_7]        = hub->port_map7;
 347         i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;
 348
 349         usb251xb_reset(hub);
 350
 351         /* write registers */
 352         for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
 353                 int offset = i * USB251XB_I2C_WRITE_SZ;
 354                 char wbuf[USB251XB_I2C_WRITE_SZ + 1];
 355
 356                 /* The first data byte transferred tells the hub how many data
 357                  * bytes will follow (byte count).
 358                  */
 359                 wbuf[0] = USB251XB_I2C_WRITE_SZ;
 360                 memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);
 361
 362                 dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
 363                         USB251XB_I2C_WRITE_SZ, i, offset);
 364
 365                 err = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
 366                                                      USB251XB_I2C_WRITE_SZ + 1,
 367                                                      wbuf);
 368                 if (err)
 369                         goto out_err;
 370         }
 371
 372         dev_info(dev, "Hub configuration was successful.\n");
 373         return 0;
 374
 375 out_err:
 376         dev_err(dev, "configuring block %d failed: %d\n", i, err);
 377         return err;
 378 }
 379
 380 static void usb251xb_get_ports_field(struct usb251xb *hub,
 381                                     const char *prop_name, u8 port_cnt,
 382                                     bool ds_only, u8 *fld)
 383 {
 384         struct device *dev = hub->dev;
 385         struct property *prop;
 386         const __be32 *p;
 387         u32 port;
 388
 389         of_property_for_each_u32(dev->of_node, prop_name, prop, p, port) {
 390                 if ((port >= ds_only ? 1 : 0) && (port <= port_cnt))
 391                         *fld |= BIT(port);
 392                 else
 393                         dev_warn(dev, "port %u doesn't exist\n", port);
 394         }
 395 }
 396
 397 static int usb251xb_get_ofdata(struct usb251xb *hub,
 398                                const struct usb251xb_data *data)
 399 {
 400         struct device *dev = hub->dev;
 401         struct device_node *np = dev->of_node;
 402         int len;
 403         u32 property_u32 = 0;
 404         const char *cproperty_char;
 405         char str[USB251XB_STRING_BUFSIZE / 2];
 406
 407         if (!np) {
 408                 dev_err(dev, "failed to get ofdata\n");
 409                 return -ENODEV;
 410         }
 411
 412         hub->skip_config = of_property_read_bool(np, "skip-config");
 413
 414         hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
 415         if (IS_ERR(hub->gpio_reset))
 416                 return dev_err_probe(dev, PTR_ERR(hub->gpio_reset),
 417                                      "unable to request GPIO reset pin\n");
 418
 419         if (of_property_read_u16(np, "vendor-id", &hub->vendor_id))
 420                 hub->vendor_id = USB251XB_DEF_VENDOR_ID;
 421
 422         if (of_property_read_u16(np, "product-id", &hub->product_id))
 423                 hub->product_id = data->product_id;
 424
 425         if (of_property_read_u16(np, "device-id", &hub->device_id))
 426                 hub->device_id = USB251XB_DEF_DEVICE_ID;
 427
 428         hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
 429         if (of_property_read_bool(np, "self-powered")) {
 430                 hub->conf_data1 |= BIT(7);
 431
 432                 /* Configure Over-Current sens when self-powered */
 433                 hub->conf_data1 &= ~BIT(2);
 434                 if (of_property_read_bool(np, "ganged-sensing"))
 435                         hub->conf_data1 &= ~BIT(1);
 436                 else if (of_property_read_bool(np, "individual-sensing"))
 437                         hub->conf_data1 |= BIT(1);
 438         } else if (of_property_read_bool(np, "bus-powered")) {
 439                 hub->conf_data1 &= ~BIT(7);
 440
 441                 /* Disable Over-Current sense when bus-powered */
 442                 hub->conf_data1 |= BIT(2);
 443         }
 444
 445         if (of_property_read_bool(np, "disable-hi-speed"))
 446                 hub->conf_data1 |= BIT(5);
 447
 448         if (of_property_read_bool(np, "multi-tt"))
 449                 hub->conf_data1 |= BIT(4);
 450         else if (of_property_read_bool(np, "single-tt"))
 451                 hub->conf_data1 &= ~BIT(4);
 452
 453         if (of_property_read_bool(np, "disable-eop"))
 454                 hub->conf_data1 |= BIT(3);
 455
 456         if (of_property_read_bool(np, "individual-port-switching"))
 457                 hub->conf_data1 |= BIT(0);
 458         else if (of_property_read_bool(np, "ganged-port-switching"))
 459                 hub->conf_data1 &= ~BIT(0);
 460
 461         hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
 462         if (of_property_read_bool(np, "dynamic-power-switching"))
 463                 hub->conf_data2 |= BIT(7);
 464
 465         if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) {
 466                 if (property_u32 == 100) {
 467                         /* 100 us*/
 468                         hub->conf_data2 &= ~BIT(5);
 469                         hub->conf_data2 &= ~BIT(4);
 470                 } else if (property_u32 == 4000) {
 471                         /* 4 ms */
 472                         hub->conf_data2 &= ~BIT(5);
 473                         hub->conf_data2 |= BIT(4);
 474                 } else if (property_u32 == 16000) {
 475                         /* 16 ms */
 476                         hub->conf_data2 |= BIT(5);
 477                         hub->conf_data2 |= BIT(4);
 478                 } else {
 479                         /* 8 ms (DEFAULT) */
 480                         hub->conf_data2 |= BIT(5);
 481                         hub->conf_data2 &= ~BIT(4);
 482                 }
 483         }
 484
 485         if (of_property_read_bool(np, "compound-device"))
 486                 hub->conf_data2 |= BIT(3);
 487
 488         hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
 489         if (of_property_read_bool(np, "port-mapping-mode"))
 490                 hub->conf_data3 |= BIT(3);
 491
 492         if (data->led_support && of_get_property(np, "led-usb-mode", NULL))
 493                 hub->conf_data3 &= ~BIT(1);
 494
 495         if (of_property_read_bool(np, "string-support"))
 496                 hub->conf_data3 |= BIT(0);
 497
 498         hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
 499         usb251xb_get_ports_field(hub, "non-removable-ports", data->port_cnt,
 500                                  true, &hub->non_rem_dev);
 501
 502         hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
 503         usb251xb_get_ports_field(hub, "sp-disabled-ports", data->port_cnt,
 504                                  true, &hub->port_disable_sp);
 505
 506         hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
 507         usb251xb_get_ports_field(hub, "bp-disabled-ports", data->port_cnt,
 508                                  true, &hub->port_disable_bp);
 509
 510         hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
 511         if (!of_property_read_u32(np, "sp-max-total-current-microamp",
 512             &property_u32))
 513                 hub->max_power_sp = min_t(u8, property_u32 / 2000, 50);
 514
 515         hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
 516         if (!of_property_read_u32(np, "bp-max-total-current-microamp",
 517             &property_u32))
 518                 hub->max_power_bp = min_t(u8, property_u32 / 2000, 255);
 519
 520         hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
 521         if (!of_property_read_u32(np, "sp-max-removable-current-microamp",
 522             &property_u32))
 523                 hub->max_current_sp = min_t(u8, property_u32 / 2000, 50);
 524
 525         hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
 526         if (!of_property_read_u32(np, "bp-max-removable-current-microamp",
 527             &property_u32))
 528                 hub->max_current_bp = min_t(u8, property_u32 / 2000, 255);
 529
 530         hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
 531         if (!of_property_read_u32(np, "power-on-time-ms", &property_u32))
 532                 hub->power_on_time = min_t(u8, property_u32 / 2, 255);
 533
 534         if (of_property_read_u16(np, "language-id", &hub->lang_id))
 535                 hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
 536
 537         if (of_property_read_u8(np, "boost-up", &hub->boost_up))
 538                 hub->boost_up = USB251XB_DEF_BOOST_UP;
 539
 540         cproperty_char = of_get_property(np, "manufacturer", NULL);
 541         strscpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
 542                 sizeof(str));
 543         hub->manufacturer_len = strlen(str) & 0xFF;
 544         memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
 545         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 546         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 547                               (wchar_t *)hub->manufacturer,
 548                               USB251XB_STRING_BUFSIZE);
 549
 550         cproperty_char = of_get_property(np, "product", NULL);
 551         strscpy(str, cproperty_char ? : data->product_str, sizeof(str));
 552         hub->product_len = strlen(str) & 0xFF;
 553         memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
 554         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 555         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 556                               (wchar_t *)hub->product,
 557                               USB251XB_STRING_BUFSIZE);
 558
 559         cproperty_char = of_get_property(np, "serial", NULL);
 560         strscpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
 561                 sizeof(str));
 562         hub->serial_len = strlen(str) & 0xFF;
 563         memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
 564         len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
 565         len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
 566                               (wchar_t *)hub->serial,
 567                               USB251XB_STRING_BUFSIZE);
 568
 569         /*
 570          * The datasheet documents the register as 'Port Swap' but in real the
 571          * register controls the USB DP/DM signal swapping for each port.
 572          */
 573         hub->port_swap = USB251XB_DEF_PORT_SWAP;
 574         usb251xb_get_ports_field(hub, "swap-dx-lanes", data->port_cnt,
 575                                  false, &hub->port_swap);
 576
 577         /* The following parameters are currently not exposed to devicetree, but
 578          * may be as soon as needed.
 579          */
 580         hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
 581         hub->boost_57 = USB251XB_DEF_BOOST_57;
 582         hub->boost_14 = USB251XB_DEF_BOOST_14;
 583         hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
 584         hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
 585         hub->port_map56 = USB251XB_DEF_PORT_MAP_56;
 586         hub->port_map7  = USB251XB_DEF_PORT_MAP_7;
 587
 588         return 0;
 589 }
 590
 591 static const struct of_device_id usb251xb_of_match[] = {
 592         {
 593                 .compatible = "microchip,usb2422",
 594                 .data = &usb2422_data,
 595         }, {
 596                 .compatible = "microchip,usb2512b",
 597                 .data = &usb2512b_data,
 598         }, {
 599                 .compatible = "microchip,usb2512bi",
 600                 .data = &usb2512bi_data,
 601         }, {
 602                 .compatible = "microchip,usb2513b",
 603                 .data = &usb2513b_data,
 604         }, {
 605                 .compatible = "microchip,usb2513bi",
 606                 .data = &usb2513bi_data,
 607         }, {
 608                 .compatible = "microchip,usb2514b",
 609                 .data = &usb2514b_data,
 610         }, {
 611                 .compatible = "microchip,usb2514bi",
 612                 .data = &usb2514bi_data,
 613         }, {
 614                 .compatible = "microchip,usb2517",
 615                 .data = &usb2517_data,
 616         }, {
 617                 .compatible = "microchip,usb2517i",
 618                 .data = &usb2517i_data,
 619         }, {
 620                 /* sentinel */
 621         }
 622 };
 623 MODULE_DEVICE_TABLE(of, usb251xb_of_match);
 624
 625 static void usb251xb_regulator_disable_action(void *data)
 626 {
 627         struct usb251xb *hub = data;
 628
 629         regulator_disable(hub->vdd);
 630 }
 631
 632 static int usb251xb_probe(struct usb251xb *hub)
 633 {
 634         struct device *dev = hub->dev;
 635         struct device_node *np = dev->of_node;
 636         const struct usb251xb_data *usb_data = of_device_get_match_data(dev);
 637         int err;
 638
 639         if (np && usb_data) {
 640                 err = usb251xb_get_ofdata(hub, usb_data);
 641                 if (err) {
 642                         dev_err(dev, "failed to get ofdata: %d\n", err);
 643                         return err;
 644                 }
 645         }
 646
 647         /*
 648          * usb251x SMBus-slave SCL lane is muxed with CFG_SEL0 pin. So if anyone
 649          * tries to work with the bus at the moment the hub reset is released,
 650          * it may cause an invalid config being latched by usb251x. Particularly
 651          * one of the config modes makes the hub loading a default registers
 652          * value without SMBus-slave interface activation. If the hub
 653          * accidentally gets this mode, this will cause the driver SMBus-
 654          * functions failure. Normally we could just lock the SMBus-segment the
 655          * hub i2c-interface resides for the device-specific reset timing. But
 656          * the GPIO controller, which is used to handle the hub reset, might be
 657          * placed at the same i2c-bus segment. In this case an error should be
 658          * returned since we can't safely use the GPIO controller to clear the
 659          * reset state (it may affect the hub configuration) and we can't lock
 660          * the i2c-bus segment (it will cause a deadlock).
 661          */
 662         err = usb251x_check_gpio_chip(hub);
 663         if (err)
 664                 return err;
 665
 666         hub->vdd = devm_regulator_get(dev, "vdd");
 667         if (IS_ERR(hub->vdd))
 668                 return PTR_ERR(hub->vdd);
 669
 670         err = regulator_enable(hub->vdd);
 671         if (err)
 672                 return err;
 673
 674         err = devm_add_action_or_reset(dev,
 675                                        usb251xb_regulator_disable_action, hub);
 676         if (err)
 677                 return err;
 678
 679         err = usb251xb_connect(hub);
 680         if (err) {
 681                 dev_err(dev, "Failed to connect hub (%d)\n", err);
 682                 return err;
 683         }
 684
 685         dev_info(dev, "Hub probed successfully\n");
 686
 687         return 0;
 688 }
 689
 690 static int usb251xb_i2c_probe(struct i2c_client *i2c)
 691 {
 692         struct usb251xb *hub;
 693
 694         hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
 695         if (!hub)
 696                 return -ENOMEM;
 697
 698         i2c_set_clientdata(i2c, hub);
 699         hub->dev = &i2c->dev;
 700         hub->i2c = i2c;
 701
 702         return usb251xb_probe(hub);
 703 }
 704
 705 static int __maybe_unused usb251xb_suspend(struct device *dev)
 706 {
 707         struct i2c_client *client = to_i2c_client(dev);
 708         struct usb251xb *hub = i2c_get_clientdata(client);
 709
 710         return regulator_disable(hub->vdd);
 711 }
 712
 713 static int __maybe_unused usb251xb_resume(struct device *dev)
 714 {
 715         struct i2c_client *client = to_i2c_client(dev);
 716         struct usb251xb *hub = i2c_get_clientdata(client);
 717         int err;
 718
 719         err = regulator_enable(hub->vdd);
 720         if (err)
 721                 return err;
 722
 723         return usb251xb_connect(hub);
 724 }
 725
 726 static SIMPLE_DEV_PM_OPS(usb251xb_pm_ops, usb251xb_suspend, usb251xb_resume);
 727
 728 static const struct i2c_device_id usb251xb_id[] = {
 729         { "usb2422", 0 },
 730         { "usb2512b", 0 },
 731         { "usb2512bi", 0 },
 732         { "usb2513b", 0 },
 733         { "usb2513bi", 0 },
 734         { "usb2514b", 0 },
 735         { "usb2514bi", 0 },
 736         { "usb2517", 0 },
 737         { "usb2517i", 0 },
 738         { /* sentinel */ }
 739 };
 740 MODULE_DEVICE_TABLE(i2c, usb251xb_id);
 741
 742 static struct i2c_driver usb251xb_i2c_driver = {
 743         .driver = {
 744                 .name = DRIVER_NAME,
 745                 .of_match_table = usb251xb_of_match,
 746                 .pm = &usb251xb_pm_ops,
 747         },
 748         .probe = usb251xb_i2c_probe,
 749         .id_table = usb251xb_id,
 750 };
 751
 752 module_i2c_driver(usb251xb_i2c_driver);
 753
 754 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
 755 MODULE_DESCRIPTION("USB251x/xBi USB 2.0 Hub Controller Driver");
 756 MODULE_LICENSE("GPL");