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 u32 port; 386 387 of_property_for_each_u32(dev->of_node, prop_name, port) { 388 if ((port >= ds_only ? 1 : 0) && (port <= port_cnt)) 389 *fld |= BIT(port); 390 else 391 dev_warn(dev, "port %u doesn't exist\n", port); 392 } 393 } 394 395 static int usb251xb_get_ofdata(struct usb251xb *hub, 396 const struct usb251xb_data *data) 397 { 398 struct device *dev = hub->dev; 399 struct device_node *np = dev->of_node; 400 int len; 401 u32 property_u32 = 0; 402 const char *cproperty_char; 403 char str[USB251XB_STRING_BUFSIZE / 2]; 404 405 if (!np) { 406 dev_err(dev, "failed to get ofdata\n"); 407 return -ENODEV; 408 } 409 410 hub->skip_config = of_property_read_bool(np, "skip-config"); 411 412 hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); 413 if (IS_ERR(hub->gpio_reset)) 414 return dev_err_probe(dev, PTR_ERR(hub->gpio_reset), 415 "unable to request GPIO reset pin\n"); 416 417 if (of_property_read_u16(np, "vendor-id", &hub->vendor_id)) 418 hub->vendor_id = USB251XB_DEF_VENDOR_ID; 419 420 if (of_property_read_u16(np, "product-id", &hub->product_id)) 421 hub->product_id = data->product_id; 422 423 if (of_property_read_u16(np, "device-id", &hub->device_id)) 424 hub->device_id = USB251XB_DEF_DEVICE_ID; 425 426 hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1; 427 if (of_property_read_bool(np, "self-powered")) { 428 hub->conf_data1 |= BIT(7); 429 430 /* Configure Over-Current sens when self-powered */ 431 hub->conf_data1 &= ~BIT(2); 432 if (of_property_read_bool(np, "ganged-sensing")) 433 hub->conf_data1 &= ~BIT(1); 434 else if (of_property_read_bool(np, "individual-sensing")) 435 hub->conf_data1 |= BIT(1); 436 } else if (of_property_read_bool(np, "bus-powered")) { 437 hub->conf_data1 &= ~BIT(7); 438 439 /* Disable Over-Current sense when bus-powered */ 440 hub->conf_data1 |= BIT(2); 441 } 442 443 if (of_property_read_bool(np, "disable-hi-speed")) 444 hub->conf_data1 |= BIT(5); 445 446 if (of_property_read_bool(np, "multi-tt")) 447 hub->conf_data1 |= BIT(4); 448 else if (of_property_read_bool(np, "single-tt")) 449 hub->conf_data1 &= ~BIT(4); 450 451 if (of_property_read_bool(np, "disable-eop")) 452 hub->conf_data1 |= BIT(3); 453 454 if (of_property_read_bool(np, "individual-port-switching")) 455 hub->conf_data1 |= BIT(0); 456 else if (of_property_read_bool(np, "ganged-port-switching")) 457 hub->conf_data1 &= ~BIT(0); 458 459 hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2; 460 if (of_property_read_bool(np, "dynamic-power-switching")) 461 hub->conf_data2 |= BIT(7); 462 463 if (!of_property_read_u32(np, "oc-delay-us", &property_u32)) { 464 if (property_u32 == 100) { 465 /* 100 us*/ 466 hub->conf_data2 &= ~BIT(5); 467 hub->conf_data2 &= ~BIT(4); 468 } else if (property_u32 == 4000) { 469 /* 4 ms */ 470 hub->conf_data2 &= ~BIT(5); 471 hub->conf_data2 |= BIT(4); 472 } else if (property_u32 == 16000) { 473 /* 16 ms */ 474 hub->conf_data2 |= BIT(5); 475 hub->conf_data2 |= BIT(4); 476 } else { 477 /* 8 ms (DEFAULT) */ 478 hub->conf_data2 |= BIT(5); 479 hub->conf_data2 &= ~BIT(4); 480 } 481 } 482 483 if (of_property_read_bool(np, "compound-device")) 484 hub->conf_data2 |= BIT(3); 485 486 hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3; 487 if (of_property_read_bool(np, "port-mapping-mode")) 488 hub->conf_data3 |= BIT(3); 489 490 if (data->led_support && of_get_property(np, "led-usb-mode", NULL)) 491 hub->conf_data3 &= ~BIT(1); 492 493 if (of_property_read_bool(np, "string-support")) 494 hub->conf_data3 |= BIT(0); 495 496 hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES; 497 usb251xb_get_ports_field(hub, "non-removable-ports", data->port_cnt, 498 true, &hub->non_rem_dev); 499 500 hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF; 501 usb251xb_get_ports_field(hub, "sp-disabled-ports", data->port_cnt, 502 true, &hub->port_disable_sp); 503 504 hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS; 505 usb251xb_get_ports_field(hub, "bp-disabled-ports", data->port_cnt, 506 true, &hub->port_disable_bp); 507 508 hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF; 509 if (!of_property_read_u32(np, "sp-max-total-current-microamp", 510 &property_u32)) 511 hub->max_power_sp = min_t(u8, property_u32 / 2000, 50); 512 513 hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS; 514 if (!of_property_read_u32(np, "bp-max-total-current-microamp", 515 &property_u32)) 516 hub->max_power_bp = min_t(u8, property_u32 / 2000, 255); 517 518 hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF; 519 if (!of_property_read_u32(np, "sp-max-removable-current-microamp", 520 &property_u32)) 521 hub->max_current_sp = min_t(u8, property_u32 / 2000, 50); 522 523 hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS; 524 if (!of_property_read_u32(np, "bp-max-removable-current-microamp", 525 &property_u32)) 526 hub->max_current_bp = min_t(u8, property_u32 / 2000, 255); 527 528 hub->power_on_time = USB251XB_DEF_POWER_ON_TIME; 529 if (!of_property_read_u32(np, "power-on-time-ms", &property_u32)) 530 hub->power_on_time = min_t(u8, property_u32 / 2, 255); 531 532 if (of_property_read_u16(np, "language-id", &hub->lang_id)) 533 hub->lang_id = USB251XB_DEF_LANGUAGE_ID; 534 535 if (of_property_read_u8(np, "boost-up", &hub->boost_up)) 536 hub->boost_up = USB251XB_DEF_BOOST_UP; 537 538 cproperty_char = of_get_property(np, "manufacturer", NULL); 539 strscpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING, 540 sizeof(str)); 541 hub->manufacturer_len = strlen(str) & 0xFF; 542 memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE); 543 len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str)); 544 len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN, 545 (wchar_t *)hub->manufacturer, 546 USB251XB_STRING_BUFSIZE); 547 548 cproperty_char = of_get_property(np, "product", NULL); 549 strscpy(str, cproperty_char ? : data->product_str, sizeof(str)); 550 hub->product_len = strlen(str) & 0xFF; 551 memset(hub->product, 0, USB251XB_STRING_BUFSIZE); 552 len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str)); 553 len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN, 554 (wchar_t *)hub->product, 555 USB251XB_STRING_BUFSIZE); 556 557 cproperty_char = of_get_property(np, "serial", NULL); 558 strscpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING, 559 sizeof(str)); 560 hub->serial_len = strlen(str) & 0xFF; 561 memset(hub->serial, 0, USB251XB_STRING_BUFSIZE); 562 len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str)); 563 len = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN, 564 (wchar_t *)hub->serial, 565 USB251XB_STRING_BUFSIZE); 566 567 /* 568 * The datasheet documents the register as 'Port Swap' but in real the 569 * register controls the USB DP/DM signal swapping for each port. 570 */ 571 hub->port_swap = USB251XB_DEF_PORT_SWAP; 572 usb251xb_get_ports_field(hub, "swap-dx-lanes", data->port_cnt, 573 false, &hub->port_swap); 574 575 /* The following parameters are currently not exposed to devicetree, but 576 * may be as soon as needed. 577 */ 578 hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE; 579 hub->boost_57 = USB251XB_DEF_BOOST_57; 580 hub->boost_14 = USB251XB_DEF_BOOST_14; 581 hub->port_map12 = USB251XB_DEF_PORT_MAP_12; 582 hub->port_map34 = USB251XB_DEF_PORT_MAP_34; 583 hub->port_map56 = USB251XB_DEF_PORT_MAP_56; 584 hub->port_map7 = USB251XB_DEF_PORT_MAP_7; 585 586 return 0; 587 } 588 589 static const struct of_device_id usb251xb_of_match[] = { 590 { 591 .compatible = "microchip,usb2422", 592 .data = &usb2422_data, 593 }, { 594 .compatible = "microchip,usb2512b", 595 .data = &usb2512b_data, 596 }, { 597 .compatible = "microchip,usb2512bi", 598 .data = &usb2512bi_data, 599 }, { 600 .compatible = "microchip,usb2513b", 601 .data = &usb2513b_data, 602 }, { 603 .compatible = "microchip,usb2513bi", 604 .data = &usb2513bi_data, 605 }, { 606 .compatible = "microchip,usb2514b", 607 .data = &usb2514b_data, 608 }, { 609 .compatible = "microchip,usb2514bi", 610 .data = &usb2514bi_data, 611 }, { 612 .compatible = "microchip,usb2517", 613 .data = &usb2517_data, 614 }, { 615 .compatible = "microchip,usb2517i", 616 .data = &usb2517i_data, 617 }, { 618 /* sentinel */ 619 } 620 }; 621 MODULE_DEVICE_TABLE(of, usb251xb_of_match); 622 623 static void usb251xb_regulator_disable_action(void *data) 624 { 625 struct usb251xb *hub = data; 626 627 regulator_disable(hub->vdd); 628 } 629 630 static int usb251xb_probe(struct usb251xb *hub) 631 { 632 struct device *dev = hub->dev; 633 struct device_node *np = dev->of_node; 634 const struct usb251xb_data *usb_data = of_device_get_match_data(dev); 635 int err; 636 637 if (np && usb_data) { 638 err = usb251xb_get_ofdata(hub, usb_data); 639 if (err) { 640 dev_err(dev, "failed to get ofdata: %d\n", err); 641 return err; 642 } 643 } 644 645 /* 646 * usb251x SMBus-slave SCL lane is muxed with CFG_SEL0 pin. So if anyone 647 * tries to work with the bus at the moment the hub reset is released, 648 * it may cause an invalid config being latched by usb251x. Particularly 649 * one of the config modes makes the hub loading a default registers 650 * value without SMBus-slave interface activation. If the hub 651 * accidentally gets this mode, this will cause the driver SMBus- 652 * functions failure. Normally we could just lock the SMBus-segment the 653 * hub i2c-interface resides for the device-specific reset timing. But 654 * the GPIO controller, which is used to handle the hub reset, might be 655 * placed at the same i2c-bus segment. In this case an error should be 656 * returned since we can't safely use the GPIO controller to clear the 657 * reset state (it may affect the hub configuration) and we can't lock 658 * the i2c-bus segment (it will cause a deadlock). 659 */ 660 err = usb251x_check_gpio_chip(hub); 661 if (err) 662 return err; 663 664 hub->vdd = devm_regulator_get(dev, "vdd"); 665 if (IS_ERR(hub->vdd)) 666 return PTR_ERR(hub->vdd); 667 668 err = regulator_enable(hub->vdd); 669 if (err) 670 return err; 671 672 err = devm_add_action_or_reset(dev, 673 usb251xb_regulator_disable_action, hub); 674 if (err) 675 return err; 676 677 err = usb251xb_connect(hub); 678 if (err) { 679 dev_err(dev, "Failed to connect hub (%d)\n", err); 680 return err; 681 } 682 683 dev_info(dev, "Hub probed successfully\n"); 684 685 return 0; 686 } 687 688 static int usb251xb_i2c_probe(struct i2c_client *i2c) 689 { 690 struct usb251xb *hub; 691 692 hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL); 693 if (!hub) 694 return -ENOMEM; 695 696 i2c_set_clientdata(i2c, hub); 697 hub->dev = &i2c->dev; 698 hub->i2c = i2c; 699 700 return usb251xb_probe(hub); 701 } 702 703 static int __maybe_unused usb251xb_suspend(struct device *dev) 704 { 705 struct i2c_client *client = to_i2c_client(dev); 706 struct usb251xb *hub = i2c_get_clientdata(client); 707 708 return regulator_disable(hub->vdd); 709 } 710 711 static int __maybe_unused usb251xb_resume(struct device *dev) 712 { 713 struct i2c_client *client = to_i2c_client(dev); 714 struct usb251xb *hub = i2c_get_clientdata(client); 715 int err; 716 717 err = regulator_enable(hub->vdd); 718 if (err) 719 return err; 720 721 return usb251xb_connect(hub); 722 } 723 724 static SIMPLE_DEV_PM_OPS(usb251xb_pm_ops, usb251xb_suspend, usb251xb_resume); 725 726 static const struct i2c_device_id usb251xb_id[] = { 727 { "usb2422" }, 728 { "usb2512b" }, 729 { "usb2512bi" }, 730 { "usb2513b" }, 731 { "usb2513bi" }, 732 { "usb2514b" }, 733 { "usb2514bi" }, 734 { "usb2517" }, 735 { "usb2517i" }, 736 { /* sentinel */ } 737 }; 738 MODULE_DEVICE_TABLE(i2c, usb251xb_id); 739 740 static struct i2c_driver usb251xb_i2c_driver = { 741 .driver = { 742 .name = DRIVER_NAME, 743 .of_match_table = usb251xb_of_match, 744 .pm = &usb251xb_pm_ops, 745 }, 746 .probe = usb251xb_i2c_probe, 747 .id_table = usb251xb_id, 748 }; 749 750 module_i2c_driver(usb251xb_i2c_driver); 751 752 MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>"); 753 MODULE_DESCRIPTION("USB251x/xBi USB 2.0 Hub Controller Driver"); 754 MODULE_LICENSE("GPL"); 755