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 int ucs1002_set_usb_type(struct ucs1002_info *info, int val) 300 { 301 unsigned int mode; 302 303 switch (val) { 304 /* 305 * POWER_SUPPLY_USB_TYPE_UNKNOWN == 0, map this to dedicated for 306 * userspace API compatibility with older versions of this driver 307 * which mapped 0 to dedicated. 308 */ 309 case POWER_SUPPLY_USB_TYPE_UNKNOWN: 310 case POWER_SUPPLY_USB_TYPE_PD: 311 mode = V_SET_ACTIVE_MODE_DEDICATED; 312 break; 313 case POWER_SUPPLY_USB_TYPE_SDP: 314 mode = V_SET_ACTIVE_MODE_BC12_SDP; 315 break; 316 case POWER_SUPPLY_USB_TYPE_DCP: 317 mode = V_SET_ACTIVE_MODE_BC12_DCP; 318 break; 319 case POWER_SUPPLY_USB_TYPE_CDP: 320 mode = V_SET_ACTIVE_MODE_BC12_CDP; 321 break; 322 default: 323 return -EINVAL; 324 } 325 326 return regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, 327 V_SET_ACTIVE_MODE_MASK, mode); 328 } 329 330 static int ucs1002_get_usb_type(struct ucs1002_info *info, 331 union power_supply_propval *val) 332 { 333 enum power_supply_usb_type type; 334 unsigned int reg; 335 int ret; 336 337 ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®); 338 if (ret) 339 return ret; 340 341 switch (reg & F_ACTIVE_MODE_MASK) { 342 default: 343 type = POWER_SUPPLY_USB_TYPE_UNKNOWN; 344 break; 345 case F_ACTIVE_MODE_DEDICATED: 346 type = POWER_SUPPLY_USB_TYPE_PD; 347 break; 348 case F_ACTIVE_MODE_BC12_SDP: 349 type = POWER_SUPPLY_USB_TYPE_SDP; 350 break; 351 case F_ACTIVE_MODE_BC12_DCP: 352 type = POWER_SUPPLY_USB_TYPE_DCP; 353 break; 354 case F_ACTIVE_MODE_BC12_CDP: 355 type = POWER_SUPPLY_USB_TYPE_CDP; 356 break; 357 } 358 359 val->intval = type; 360 361 return 0; 362 } 363 364 static int ucs1002_get_property(struct power_supply *psy, 365 enum power_supply_property psp, 366 union power_supply_propval *val) 367 { 368 struct ucs1002_info *info = power_supply_get_drvdata(psy); 369 370 switch (psp) { 371 case POWER_SUPPLY_PROP_ONLINE: 372 return ucs1002_get_online(info, val); 373 case POWER_SUPPLY_PROP_CHARGE_NOW: 374 return ucs1002_get_charge(info, val); 375 case POWER_SUPPLY_PROP_CURRENT_NOW: 376 return ucs1002_get_current(info, val); 377 case POWER_SUPPLY_PROP_CURRENT_MAX: 378 return ucs1002_get_max_current(info, val); 379 case POWER_SUPPLY_PROP_USB_TYPE: 380 return ucs1002_get_usb_type(info, val); 381 case POWER_SUPPLY_PROP_HEALTH: 382 val->intval = info->health; 383 return 0; 384 case POWER_SUPPLY_PROP_PRESENT: 385 val->intval = info->present; 386 return 0; 387 case POWER_SUPPLY_PROP_MANUFACTURER: 388 val->strval = UCS1002_MANUFACTURER; 389 return 0; 390 default: 391 return -EINVAL; 392 } 393 } 394 395 static int ucs1002_set_property(struct power_supply *psy, 396 enum power_supply_property psp, 397 const union power_supply_propval *val) 398 { 399 struct ucs1002_info *info = power_supply_get_drvdata(psy); 400 401 switch (psp) { 402 case POWER_SUPPLY_PROP_CURRENT_MAX: 403 return ucs1002_set_max_current(info, val->intval); 404 case POWER_SUPPLY_PROP_USB_TYPE: 405 return ucs1002_set_usb_type(info, val->intval); 406 default: 407 return -EINVAL; 408 } 409 } 410 411 static int ucs1002_property_is_writeable(struct power_supply *psy, 412 enum power_supply_property psp) 413 { 414 switch (psp) { 415 case POWER_SUPPLY_PROP_CURRENT_MAX: 416 case POWER_SUPPLY_PROP_USB_TYPE: 417 return true; 418 default: 419 return false; 420 } 421 } 422 423 static const struct power_supply_desc ucs1002_charger_desc = { 424 .name = "ucs1002", 425 .type = POWER_SUPPLY_TYPE_USB, 426 .usb_types = BIT(POWER_SUPPLY_USB_TYPE_SDP) | 427 BIT(POWER_SUPPLY_USB_TYPE_CDP) | 428 BIT(POWER_SUPPLY_USB_TYPE_DCP) | 429 BIT(POWER_SUPPLY_USB_TYPE_PD) | 430 BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN), 431 .get_property = ucs1002_get_property, 432 .set_property = ucs1002_set_property, 433 .property_is_writeable = ucs1002_property_is_writeable, 434 .properties = ucs1002_props, 435 .num_properties = ARRAY_SIZE(ucs1002_props), 436 }; 437 438 static void ucs1002_health_poll(struct work_struct *work) 439 { 440 struct ucs1002_info *info = container_of(work, struct ucs1002_info, 441 health_poll.work); 442 int ret; 443 u32 reg; 444 445 ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, ®); 446 if (ret) 447 return; 448 449 /* bad health and no status change, just schedule us again in a while */ 450 if ((reg & F_ERR) && info->health != POWER_SUPPLY_HEALTH_GOOD) { 451 schedule_delayed_work(&info->health_poll, 452 msecs_to_jiffies(2000)); 453 return; 454 } 455 456 if (reg & F_TSD) 457 info->health = POWER_SUPPLY_HEALTH_OVERHEAT; 458 else if (reg & (F_OVER_VOLT | F_BACK_VOLT)) 459 info->health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 460 else if (reg & F_OVER_ILIM) 461 info->health = POWER_SUPPLY_HEALTH_OVERCURRENT; 462 else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT)) 463 info->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 464 else 465 info->health = POWER_SUPPLY_HEALTH_GOOD; 466 467 sysfs_notify(&info->charger->dev.kobj, NULL, "health"); 468 } 469 470 static irqreturn_t ucs1002_charger_irq(int irq, void *data) 471 { 472 int ret, regval; 473 bool present; 474 struct ucs1002_info *info = data; 475 476 present = info->present; 477 478 ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, ®val); 479 if (ret) 480 return IRQ_HANDLED; 481 482 /* update attached status */ 483 info->present = regval & F_ADET_PIN; 484 485 /* notify the change */ 486 if (present != info->present) 487 power_supply_changed(info->charger); 488 489 return IRQ_HANDLED; 490 } 491 492 static irqreturn_t ucs1002_alert_irq(int irq, void *data) 493 { 494 struct ucs1002_info *info = data; 495 496 mod_delayed_work(system_wq, &info->health_poll, 0); 497 498 return IRQ_HANDLED; 499 } 500 501 static int ucs1002_regulator_enable(struct regulator_dev *rdev) 502 { 503 struct ucs1002_info *info = rdev_get_drvdata(rdev); 504 505 /* 506 * If the output is disabled due to 0 maximum current, just pretend the 507 * enable did work. The regulator will be enabled as soon as we get a 508 * a non-zero maximum current budget. 509 */ 510 if (info->output_disable) 511 return 0; 512 513 return regulator_enable_regmap(rdev); 514 } 515 516 static const struct regulator_ops ucs1002_regulator_ops = { 517 .is_enabled = regulator_is_enabled_regmap, 518 .enable = ucs1002_regulator_enable, 519 .disable = regulator_disable_regmap, 520 }; 521 522 static const struct regulator_desc ucs1002_regulator_descriptor = { 523 .name = "ucs1002-vbus", 524 .ops = &ucs1002_regulator_ops, 525 .type = REGULATOR_VOLTAGE, 526 .owner = THIS_MODULE, 527 .enable_reg = UCS1002_REG_SWITCH_CFG, 528 .enable_mask = F_PWR_EN_SET, 529 .enable_val = F_PWR_EN_SET, 530 .fixed_uV = 5000000, 531 .n_voltages = 1, 532 }; 533 534 static int ucs1002_probe(struct i2c_client *client) 535 { 536 struct device *dev = &client->dev; 537 struct power_supply_config charger_config = {}; 538 const struct regmap_config regmap_config = { 539 .reg_bits = 8, 540 .val_bits = 8, 541 }; 542 struct regulator_config regulator_config = {}; 543 int irq_a_det, irq_alert, ret; 544 struct ucs1002_info *info; 545 unsigned int regval; 546 547 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 548 if (!info) 549 return -ENOMEM; 550 551 info->regmap = devm_regmap_init_i2c(client, ®map_config); 552 ret = PTR_ERR_OR_ZERO(info->regmap); 553 if (ret) { 554 dev_err(dev, "Regmap initialization failed: %d\n", ret); 555 return ret; 556 } 557 558 info->client = client; 559 560 irq_a_det = of_irq_get_byname(dev->of_node, "a_det"); 561 irq_alert = of_irq_get_byname(dev->of_node, "alert"); 562 563 charger_config.of_node = dev->of_node; 564 charger_config.drv_data = info; 565 566 ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, ®val); 567 if (ret) { 568 dev_err(dev, "Failed to read product ID: %d\n", ret); 569 return ret; 570 } 571 572 if (regval != UCS1002_PRODUCT_ID) { 573 dev_err(dev, 574 "Product ID does not match (0x%02x != 0x%02x)\n", 575 regval, UCS1002_PRODUCT_ID); 576 return -ENODEV; 577 } 578 579 /* Enable charge rationing by default */ 580 ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG, 581 F_RATION_EN, F_RATION_EN); 582 if (ret) { 583 dev_err(dev, "Failed to read general config: %d\n", ret); 584 return ret; 585 } 586 587 /* 588 * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active 589 * mode selection to BC1.2 CDP. 590 */ 591 ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, 592 V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE, 593 V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE); 594 if (ret) { 595 dev_err(dev, "Failed to configure default mode: %d\n", ret); 596 return ret; 597 } 598 /* 599 * Be safe and set initial current limit to 500mA 600 */ 601 ret = ucs1002_set_max_current(info, 500000); 602 if (ret) { 603 dev_err(dev, "Failed to set max current default: %d\n", ret); 604 return ret; 605 } 606 607 info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc, 608 &charger_config); 609 ret = PTR_ERR_OR_ZERO(info->charger); 610 if (ret) { 611 dev_err(dev, "Failed to register power supply: %d\n", ret); 612 return ret; 613 } 614 615 ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®val); 616 if (ret) { 617 dev_err(dev, "Failed to read pin status: %d\n", ret); 618 return ret; 619 } 620 621 info->regulator_descriptor = 622 devm_kmemdup(dev, &ucs1002_regulator_descriptor, 623 sizeof(ucs1002_regulator_descriptor), 624 GFP_KERNEL); 625 if (!info->regulator_descriptor) 626 return -ENOMEM; 627 628 info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN); 629 630 regulator_config.dev = dev; 631 regulator_config.of_node = dev->of_node; 632 regulator_config.regmap = info->regmap; 633 regulator_config.driver_data = info; 634 635 info->rdev = devm_regulator_register(dev, info->regulator_descriptor, 636 ®ulator_config); 637 ret = PTR_ERR_OR_ZERO(info->rdev); 638 if (ret) { 639 dev_err(dev, "Failed to register VBUS regulator: %d\n", ret); 640 return ret; 641 } 642 643 info->health = POWER_SUPPLY_HEALTH_GOOD; 644 INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll); 645 646 if (irq_a_det > 0) { 647 ret = devm_request_threaded_irq(dev, irq_a_det, NULL, 648 ucs1002_charger_irq, 649 IRQF_ONESHOT, 650 "ucs1002-a_det", info); 651 if (ret) { 652 dev_err(dev, "Failed to request A_DET threaded irq: %d\n", 653 ret); 654 return ret; 655 } 656 } 657 658 if (irq_alert > 0) { 659 ret = devm_request_irq(dev, irq_alert, ucs1002_alert_irq, 660 0,"ucs1002-alert", info); 661 if (ret) { 662 dev_err(dev, "Failed to request ALERT threaded irq: %d\n", 663 ret); 664 return ret; 665 } 666 } 667 668 return 0; 669 } 670 671 static const struct of_device_id ucs1002_of_match[] = { 672 { .compatible = "microchip,ucs1002", }, 673 { /* sentinel */ }, 674 }; 675 MODULE_DEVICE_TABLE(of, ucs1002_of_match); 676 677 static struct i2c_driver ucs1002_driver = { 678 .driver = { 679 .name = "ucs1002", 680 .of_match_table = ucs1002_of_match, 681 }, 682 .probe = ucs1002_probe, 683 }; 684 module_i2c_driver(ucs1002_driver); 685 686 MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller"); 687 MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>"); 688 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); 689 MODULE_LICENSE("GPL"); 690