1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Driver for UCS1002 Programmable USB Port Power Controller 4 * 5 * Copyright (C) 2019 Zodiac Inflight Innovations 6 */ 7 #include <linux/bits.h> 8 #include <linux/freezer.h> 9 #include <linux/gpio/consumer.h> 10 #include <linux/i2c.h> 11 #include <linux/interrupt.h> 12 #include <linux/kernel.h> 13 #include <linux/kthread.h> 14 #include <linux/device.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/of_irq.h> 18 #include <linux/power_supply.h> 19 #include <linux/regmap.h> 20 #include <linux/regulator/driver.h> 21 #include <linux/regulator/of_regulator.h> 22 23 /* UCS1002 Registers */ 24 #define UCS1002_REG_CURRENT_MEASUREMENT 0x00 25 26 /* 27 * The Total Accumulated Charge registers store the total accumulated 28 * charge delivered from the VS source to a portable device. The total 29 * value is calculated using four registers, from 01h to 04h. The bit 30 * weighting of the registers is given in mA/hrs. 31 */ 32 #define UCS1002_REG_TOTAL_ACC_CHARGE 0x01 33 34 /* Other Status Register */ 35 #define UCS1002_REG_OTHER_STATUS 0x0f 36 # define F_ADET_PIN BIT(4) 37 # define F_CHG_ACT BIT(3) 38 39 /* Interrupt Status */ 40 #define UCS1002_REG_INTERRUPT_STATUS 0x10 41 # define F_ERR BIT(7) 42 # define F_DISCHARGE_ERR BIT(6) 43 # define F_RESET BIT(5) 44 # define F_MIN_KEEP_OUT BIT(4) 45 # define F_TSD BIT(3) 46 # define F_OVER_VOLT BIT(2) 47 # define F_BACK_VOLT BIT(1) 48 # define F_OVER_ILIM BIT(0) 49 50 /* Pin Status Register */ 51 #define UCS1002_REG_PIN_STATUS 0x14 52 # define UCS1002_PWR_STATE_MASK 0x03 53 # define F_PWR_EN_PIN BIT(6) 54 # define F_M2_PIN BIT(5) 55 # define F_M1_PIN BIT(4) 56 # define F_EM_EN_PIN BIT(3) 57 # define F_SEL_PIN BIT(2) 58 # define F_ACTIVE_MODE_MASK GENMASK(5, 3) 59 # define F_ACTIVE_MODE_PASSTHROUGH F_M2_PIN 60 # define F_ACTIVE_MODE_DEDICATED F_EM_EN_PIN 61 # define F_ACTIVE_MODE_BC12_DCP (F_M2_PIN | F_EM_EN_PIN) 62 # define F_ACTIVE_MODE_BC12_SDP F_M1_PIN 63 # define F_ACTIVE_MODE_BC12_CDP (F_M1_PIN | F_M2_PIN | F_EM_EN_PIN) 64 65 /* General Configuration Register */ 66 #define UCS1002_REG_GENERAL_CFG 0x15 67 # define F_RATION_EN BIT(3) 68 69 /* Emulation Configuration Register */ 70 #define UCS1002_REG_EMU_CFG 0x16 71 72 /* Switch Configuration Register */ 73 #define UCS1002_REG_SWITCH_CFG 0x17 74 # define F_PIN_IGNORE BIT(7) 75 # define F_EM_EN_SET BIT(5) 76 # define F_M2_SET BIT(4) 77 # define F_M1_SET BIT(3) 78 # define F_S0_SET BIT(2) 79 # define F_PWR_EN_SET BIT(1) 80 # define F_LATCH_SET BIT(0) 81 # define V_SET_ACTIVE_MODE_MASK GENMASK(5, 3) 82 # define V_SET_ACTIVE_MODE_PASSTHROUGH F_M2_SET 83 # define V_SET_ACTIVE_MODE_DEDICATED F_EM_EN_SET 84 # define V_SET_ACTIVE_MODE_BC12_DCP (F_M2_SET | F_EM_EN_SET) 85 # define V_SET_ACTIVE_MODE_BC12_SDP F_M1_SET 86 # define V_SET_ACTIVE_MODE_BC12_CDP (F_M1_SET | F_M2_SET | F_EM_EN_SET) 87 88 /* Current Limit Register */ 89 #define UCS1002_REG_ILIMIT 0x19 90 # define UCS1002_ILIM_SW_MASK GENMASK(3, 0) 91 92 /* Product ID */ 93 #define UCS1002_REG_PRODUCT_ID 0xfd 94 # define UCS1002_PRODUCT_ID 0x4e 95 96 /* Manufacture name */ 97 #define UCS1002_MANUFACTURER "SMSC" 98 99 struct ucs1002_info { 100 struct power_supply *charger; 101 struct i2c_client *client; 102 struct regmap *regmap; 103 struct regulator_desc *regulator_descriptor; 104 struct regulator_dev *rdev; 105 bool present; 106 bool output_disable; 107 struct delayed_work health_poll; 108 int health; 109 110 }; 111 112 static enum power_supply_property ucs1002_props[] = { 113 POWER_SUPPLY_PROP_ONLINE, 114 POWER_SUPPLY_PROP_CHARGE_NOW, 115 POWER_SUPPLY_PROP_CURRENT_NOW, 116 POWER_SUPPLY_PROP_CURRENT_MAX, 117 POWER_SUPPLY_PROP_PRESENT, /* the presence of PED */ 118 POWER_SUPPLY_PROP_MANUFACTURER, 119 POWER_SUPPLY_PROP_USB_TYPE, 120 POWER_SUPPLY_PROP_HEALTH, 121 }; 122 123 static int ucs1002_get_online(struct ucs1002_info *info, 124 union power_supply_propval *val) 125 { 126 unsigned int reg; 127 int ret; 128 129 ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, ®); 130 if (ret) 131 return ret; 132 133 val->intval = !!(reg & F_CHG_ACT); 134 135 return 0; 136 } 137 138 static int ucs1002_get_charge(struct ucs1002_info *info, 139 union power_supply_propval *val) 140 { 141 /* 142 * To fit within 32 bits some values are rounded (uA/h) 143 * 144 * For Total Accumulated Charge Middle Low Byte register, addr 145 * 03h, byte 2 146 * 147 * B0: 0.01084 mA/h rounded to 11 uA/h 148 * B1: 0.02169 mA/h rounded to 22 uA/h 149 * B2: 0.04340 mA/h rounded to 43 uA/h 150 * B3: 0.08676 mA/h rounded to 87 uA/h 151 * B4: 0.17350 mA/h rounded to 173 uÁ/h 152 * 153 * For Total Accumulated Charge Low Byte register, addr 04h, 154 * byte 3 155 * 156 * B6: 0.00271 mA/h rounded to 3 uA/h 157 * B7: 0.005422 mA/h rounded to 5 uA/h 158 */ 159 static const int bit_weights_uAh[BITS_PER_TYPE(u32)] = { 160 /* 161 * Bit corresponding to low byte (offset 0x04) 162 * B0 B1 B2 B3 B4 B5 B6 B7 163 */ 164 0, 0, 0, 0, 0, 0, 3, 5, 165 /* 166 * Bit corresponding to middle low byte (offset 0x03) 167 * B0 B1 B2 B3 B4 B5 B6 B7 168 */ 169 11, 22, 43, 87, 173, 347, 694, 1388, 170 /* 171 * Bit corresponding to middle high byte (offset 0x02) 172 * B0 B1 B2 B3 B4 B5 B6 B7 173 */ 174 2776, 5552, 11105, 22210, 44420, 88840, 177700, 355400, 175 /* 176 * Bit corresponding to high byte (offset 0x01) 177 * B0 B1 B2 B3 B4 B5 B6 B7 178 */ 179 710700, 1421000, 2843000, 5685000, 11371000, 22742000, 180 45484000, 90968000, 181 }; 182 unsigned long total_acc_charger; 183 unsigned int reg; 184 int i, ret; 185 186 ret = regmap_bulk_read(info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE, 187 ®, sizeof(u32)); 188 if (ret) 189 return ret; 190 191 total_acc_charger = be32_to_cpu(reg); /* BE as per offsets above */ 192 val->intval = 0; 193 194 for_each_set_bit(i, &total_acc_charger, ARRAY_SIZE(bit_weights_uAh)) 195 val->intval += bit_weights_uAh[i]; 196 197 return 0; 198 } 199 200 static int ucs1002_get_current(struct ucs1002_info *info, 201 union power_supply_propval *val) 202 { 203 /* 204 * The Current Measurement register stores the measured 205 * current value delivered to the portable device. The range 206 * is from 9.76 mA to 2.5 A. 207 */ 208 static const int bit_weights_uA[BITS_PER_TYPE(u8)] = { 209 9760, 19500, 39000, 78100, 156200, 312300, 624600, 1249300, 210 }; 211 unsigned long current_measurement; 212 unsigned int reg; 213 int i, ret; 214 215 ret = regmap_read(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, ®); 216 if (ret) 217 return ret; 218 219 current_measurement = reg; 220 val->intval = 0; 221 222 for_each_set_bit(i, ¤t_measurement, ARRAY_SIZE(bit_weights_uA)) 223 val->intval += bit_weights_uA[i]; 224 225 return 0; 226 } 227 228 /* 229 * The Current Limit register stores the maximum current used by the 230 * port switch. The range is from 500mA to 2.5 A. 231 */ 232 static const u32 ucs1002_current_limit_uA[] = { 233 500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000, 234 }; 235 236 static int ucs1002_get_max_current(struct ucs1002_info *info, 237 union power_supply_propval *val) 238 { 239 unsigned int reg; 240 int ret; 241 242 if (info->output_disable) { 243 val->intval = 0; 244 return 0; 245 } 246 247 ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, ®); 248 if (ret) 249 return ret; 250 251 val->intval = ucs1002_current_limit_uA[reg & UCS1002_ILIM_SW_MASK]; 252 253 return 0; 254 } 255 256 static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val) 257 { 258 unsigned int reg; 259 int ret, idx; 260 261 if (val == 0) { 262 info->output_disable = true; 263 regulator_disable_regmap(info->rdev); 264 return 0; 265 } 266 267 for (idx = 0; idx < ARRAY_SIZE(ucs1002_current_limit_uA); idx++) { 268 if (val == ucs1002_current_limit_uA[idx]) 269 break; 270 } 271 272 if (idx == ARRAY_SIZE(ucs1002_current_limit_uA)) 273 return -EINVAL; 274 275 ret = regmap_write(info->regmap, UCS1002_REG_ILIMIT, idx); 276 if (ret) 277 return ret; 278 /* 279 * Any current limit setting exceeding the one set via ILIM 280 * pin will be rejected, so we read out freshly changed limit 281 * to make sure that it took effect. 282 */ 283 ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, ®); 284 if (ret) 285 return ret; 286 287 if (reg != idx) 288 return -EINVAL; 289 290 info->output_disable = false; 291 292 if (info->rdev && info->rdev->use_count && 293 !regulator_is_enabled_regmap(info->rdev)) 294 regulator_enable_regmap(info->rdev); 295 296 return 0; 297 } 298 299 static enum power_supply_usb_type ucs1002_usb_types[] = { 300 POWER_SUPPLY_USB_TYPE_PD, 301 POWER_SUPPLY_USB_TYPE_SDP, 302 POWER_SUPPLY_USB_TYPE_DCP, 303 POWER_SUPPLY_USB_TYPE_CDP, 304 POWER_SUPPLY_USB_TYPE_UNKNOWN, 305 }; 306 307 static int ucs1002_set_usb_type(struct ucs1002_info *info, int val) 308 { 309 unsigned int mode; 310 311 if (val < 0 || val >= ARRAY_SIZE(ucs1002_usb_types)) 312 return -EINVAL; 313 314 switch (ucs1002_usb_types[val]) { 315 case POWER_SUPPLY_USB_TYPE_PD: 316 mode = V_SET_ACTIVE_MODE_DEDICATED; 317 break; 318 case POWER_SUPPLY_USB_TYPE_SDP: 319 mode = V_SET_ACTIVE_MODE_BC12_SDP; 320 break; 321 case POWER_SUPPLY_USB_TYPE_DCP: 322 mode = V_SET_ACTIVE_MODE_BC12_DCP; 323 break; 324 case POWER_SUPPLY_USB_TYPE_CDP: 325 mode = V_SET_ACTIVE_MODE_BC12_CDP; 326 break; 327 default: 328 return -EINVAL; 329 } 330 331 return regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, 332 V_SET_ACTIVE_MODE_MASK, mode); 333 } 334 335 static int ucs1002_get_usb_type(struct ucs1002_info *info, 336 union power_supply_propval *val) 337 { 338 enum power_supply_usb_type type; 339 unsigned int reg; 340 int ret; 341 342 ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®); 343 if (ret) 344 return ret; 345 346 switch (reg & F_ACTIVE_MODE_MASK) { 347 default: 348 type = POWER_SUPPLY_USB_TYPE_UNKNOWN; 349 break; 350 case F_ACTIVE_MODE_DEDICATED: 351 type = POWER_SUPPLY_USB_TYPE_PD; 352 break; 353 case F_ACTIVE_MODE_BC12_SDP: 354 type = POWER_SUPPLY_USB_TYPE_SDP; 355 break; 356 case F_ACTIVE_MODE_BC12_DCP: 357 type = POWER_SUPPLY_USB_TYPE_DCP; 358 break; 359 case F_ACTIVE_MODE_BC12_CDP: 360 type = POWER_SUPPLY_USB_TYPE_CDP; 361 break; 362 } 363 364 val->intval = type; 365 366 return 0; 367 } 368 369 static int ucs1002_get_property(struct power_supply *psy, 370 enum power_supply_property psp, 371 union power_supply_propval *val) 372 { 373 struct ucs1002_info *info = power_supply_get_drvdata(psy); 374 375 switch (psp) { 376 case POWER_SUPPLY_PROP_ONLINE: 377 return ucs1002_get_online(info, val); 378 case POWER_SUPPLY_PROP_CHARGE_NOW: 379 return ucs1002_get_charge(info, val); 380 case POWER_SUPPLY_PROP_CURRENT_NOW: 381 return ucs1002_get_current(info, val); 382 case POWER_SUPPLY_PROP_CURRENT_MAX: 383 return ucs1002_get_max_current(info, val); 384 case POWER_SUPPLY_PROP_USB_TYPE: 385 return ucs1002_get_usb_type(info, val); 386 case POWER_SUPPLY_PROP_HEALTH: 387 return val->intval = info->health; 388 case POWER_SUPPLY_PROP_PRESENT: 389 val->intval = info->present; 390 return 0; 391 case POWER_SUPPLY_PROP_MANUFACTURER: 392 val->strval = UCS1002_MANUFACTURER; 393 return 0; 394 default: 395 return -EINVAL; 396 } 397 } 398 399 static int ucs1002_set_property(struct power_supply *psy, 400 enum power_supply_property psp, 401 const union power_supply_propval *val) 402 { 403 struct ucs1002_info *info = power_supply_get_drvdata(psy); 404 405 switch (psp) { 406 case POWER_SUPPLY_PROP_CURRENT_MAX: 407 return ucs1002_set_max_current(info, val->intval); 408 case POWER_SUPPLY_PROP_USB_TYPE: 409 return ucs1002_set_usb_type(info, val->intval); 410 default: 411 return -EINVAL; 412 } 413 } 414 415 static int ucs1002_property_is_writeable(struct power_supply *psy, 416 enum power_supply_property psp) 417 { 418 switch (psp) { 419 case POWER_SUPPLY_PROP_CURRENT_MAX: 420 case POWER_SUPPLY_PROP_USB_TYPE: 421 return true; 422 default: 423 return false; 424 } 425 } 426 427 static const struct power_supply_desc ucs1002_charger_desc = { 428 .name = "ucs1002", 429 .type = POWER_SUPPLY_TYPE_USB, 430 .usb_types = ucs1002_usb_types, 431 .num_usb_types = ARRAY_SIZE(ucs1002_usb_types), 432 .get_property = ucs1002_get_property, 433 .set_property = ucs1002_set_property, 434 .property_is_writeable = ucs1002_property_is_writeable, 435 .properties = ucs1002_props, 436 .num_properties = ARRAY_SIZE(ucs1002_props), 437 }; 438 439 static void ucs1002_health_poll(struct work_struct *work) 440 { 441 struct ucs1002_info *info = container_of(work, struct ucs1002_info, 442 health_poll.work); 443 int ret; 444 u32 reg; 445 446 ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, ®); 447 if (ret) 448 return; 449 450 /* bad health and no status change, just schedule us again in a while */ 451 if ((reg & F_ERR) && info->health != POWER_SUPPLY_HEALTH_GOOD) { 452 schedule_delayed_work(&info->health_poll, 453 msecs_to_jiffies(2000)); 454 return; 455 } 456 457 if (reg & F_TSD) 458 info->health = POWER_SUPPLY_HEALTH_OVERHEAT; 459 else if (reg & (F_OVER_VOLT | F_BACK_VOLT)) 460 info->health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 461 else if (reg & F_OVER_ILIM) 462 info->health = POWER_SUPPLY_HEALTH_OVERCURRENT; 463 else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT)) 464 info->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 465 else 466 info->health = POWER_SUPPLY_HEALTH_GOOD; 467 468 sysfs_notify(&info->charger->dev.kobj, NULL, "health"); 469 } 470 471 static irqreturn_t ucs1002_charger_irq(int irq, void *data) 472 { 473 int ret, regval; 474 bool present; 475 struct ucs1002_info *info = data; 476 477 present = info->present; 478 479 ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, ®val); 480 if (ret) 481 return IRQ_HANDLED; 482 483 /* update attached status */ 484 info->present = regval & F_ADET_PIN; 485 486 /* notify the change */ 487 if (present != info->present) 488 power_supply_changed(info->charger); 489 490 return IRQ_HANDLED; 491 } 492 493 static irqreturn_t ucs1002_alert_irq(int irq, void *data) 494 { 495 struct ucs1002_info *info = data; 496 497 mod_delayed_work(system_wq, &info->health_poll, 0); 498 499 return IRQ_HANDLED; 500 } 501 502 static int ucs1002_regulator_enable(struct regulator_dev *rdev) 503 { 504 struct ucs1002_info *info = rdev_get_drvdata(rdev); 505 506 /* 507 * If the output is disabled due to 0 maximum current, just pretend the 508 * enable did work. The regulator will be enabled as soon as we get a 509 * a non-zero maximum current budget. 510 */ 511 if (info->output_disable) 512 return 0; 513 514 return regulator_enable_regmap(rdev); 515 } 516 517 static const struct regulator_ops ucs1002_regulator_ops = { 518 .is_enabled = regulator_is_enabled_regmap, 519 .enable = ucs1002_regulator_enable, 520 .disable = regulator_disable_regmap, 521 }; 522 523 static const struct regulator_desc ucs1002_regulator_descriptor = { 524 .name = "ucs1002-vbus", 525 .ops = &ucs1002_regulator_ops, 526 .type = REGULATOR_VOLTAGE, 527 .owner = THIS_MODULE, 528 .enable_reg = UCS1002_REG_SWITCH_CFG, 529 .enable_mask = F_PWR_EN_SET, 530 .enable_val = F_PWR_EN_SET, 531 .fixed_uV = 5000000, 532 .n_voltages = 1, 533 }; 534 535 static int ucs1002_probe(struct i2c_client *client) 536 { 537 struct device *dev = &client->dev; 538 struct power_supply_config charger_config = {}; 539 const struct regmap_config regmap_config = { 540 .reg_bits = 8, 541 .val_bits = 8, 542 }; 543 struct regulator_config regulator_config = {}; 544 int irq_a_det, irq_alert, ret; 545 struct ucs1002_info *info; 546 unsigned int regval; 547 548 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 549 if (!info) 550 return -ENOMEM; 551 552 info->regmap = devm_regmap_init_i2c(client, ®map_config); 553 ret = PTR_ERR_OR_ZERO(info->regmap); 554 if (ret) { 555 dev_err(dev, "Regmap initialization failed: %d\n", ret); 556 return ret; 557 } 558 559 info->client = client; 560 561 irq_a_det = of_irq_get_byname(dev->of_node, "a_det"); 562 irq_alert = of_irq_get_byname(dev->of_node, "alert"); 563 564 charger_config.of_node = dev->of_node; 565 charger_config.drv_data = info; 566 567 ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, ®val); 568 if (ret) { 569 dev_err(dev, "Failed to read product ID: %d\n", ret); 570 return ret; 571 } 572 573 if (regval != UCS1002_PRODUCT_ID) { 574 dev_err(dev, 575 "Product ID does not match (0x%02x != 0x%02x)\n", 576 regval, UCS1002_PRODUCT_ID); 577 return -ENODEV; 578 } 579 580 /* Enable charge rationing by default */ 581 ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG, 582 F_RATION_EN, F_RATION_EN); 583 if (ret) { 584 dev_err(dev, "Failed to read general config: %d\n", ret); 585 return ret; 586 } 587 588 /* 589 * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active 590 * mode selection to BC1.2 CDP. 591 */ 592 ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, 593 V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE, 594 V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE); 595 if (ret) { 596 dev_err(dev, "Failed to configure default mode: %d\n", ret); 597 return ret; 598 } 599 /* 600 * Be safe and set initial current limit to 500mA 601 */ 602 ret = ucs1002_set_max_current(info, 500000); 603 if (ret) { 604 dev_err(dev, "Failed to set max current default: %d\n", ret); 605 return ret; 606 } 607 608 info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc, 609 &charger_config); 610 ret = PTR_ERR_OR_ZERO(info->charger); 611 if (ret) { 612 dev_err(dev, "Failed to register power supply: %d\n", ret); 613 return ret; 614 } 615 616 ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®val); 617 if (ret) { 618 dev_err(dev, "Failed to read pin status: %d\n", ret); 619 return ret; 620 } 621 622 info->regulator_descriptor = 623 devm_kmemdup(dev, &ucs1002_regulator_descriptor, 624 sizeof(ucs1002_regulator_descriptor), 625 GFP_KERNEL); 626 if (!info->regulator_descriptor) 627 return -ENOMEM; 628 629 info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN); 630 631 regulator_config.dev = dev; 632 regulator_config.of_node = dev->of_node; 633 regulator_config.regmap = info->regmap; 634 regulator_config.driver_data = info; 635 636 info->rdev = devm_regulator_register(dev, info->regulator_descriptor, 637 ®ulator_config); 638 ret = PTR_ERR_OR_ZERO(info->rdev); 639 if (ret) { 640 dev_err(dev, "Failed to register VBUS regulator: %d\n", ret); 641 return ret; 642 } 643 644 info->health = POWER_SUPPLY_HEALTH_GOOD; 645 INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll); 646 647 if (irq_a_det > 0) { 648 ret = devm_request_threaded_irq(dev, irq_a_det, NULL, 649 ucs1002_charger_irq, 650 IRQF_ONESHOT, 651 "ucs1002-a_det", info); 652 if (ret) { 653 dev_err(dev, "Failed to request A_DET threaded irq: %d\n", 654 ret); 655 return ret; 656 } 657 } 658 659 if (irq_alert > 0) { 660 ret = devm_request_irq(dev, irq_alert, ucs1002_alert_irq, 661 0,"ucs1002-alert", info); 662 if (ret) { 663 dev_err(dev, "Failed to request ALERT threaded irq: %d\n", 664 ret); 665 return ret; 666 } 667 } 668 669 return 0; 670 } 671 672 static const struct of_device_id ucs1002_of_match[] = { 673 { .compatible = "microchip,ucs1002", }, 674 { /* sentinel */ }, 675 }; 676 MODULE_DEVICE_TABLE(of, ucs1002_of_match); 677 678 static struct i2c_driver ucs1002_driver = { 679 .driver = { 680 .name = "ucs1002", 681 .of_match_table = ucs1002_of_match, 682 }, 683 .probe_new = ucs1002_probe, 684 }; 685 module_i2c_driver(ucs1002_driver); 686 687 MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller"); 688 MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>"); 689 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); 690 MODULE_LICENSE("GPL"); 691