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 val->intval = info->health; 388 return 0; 389 case POWER_SUPPLY_PROP_PRESENT: 390 val->intval = info->present; 391 return 0; 392 case POWER_SUPPLY_PROP_MANUFACTURER: 393 val->strval = UCS1002_MANUFACTURER; 394 return 0; 395 default: 396 return -EINVAL; 397 } 398 } 399 400 static int ucs1002_set_property(struct power_supply *psy, 401 enum power_supply_property psp, 402 const union power_supply_propval *val) 403 { 404 struct ucs1002_info *info = power_supply_get_drvdata(psy); 405 406 switch (psp) { 407 case POWER_SUPPLY_PROP_CURRENT_MAX: 408 return ucs1002_set_max_current(info, val->intval); 409 case POWER_SUPPLY_PROP_USB_TYPE: 410 return ucs1002_set_usb_type(info, val->intval); 411 default: 412 return -EINVAL; 413 } 414 } 415 416 static int ucs1002_property_is_writeable(struct power_supply *psy, 417 enum power_supply_property psp) 418 { 419 switch (psp) { 420 case POWER_SUPPLY_PROP_CURRENT_MAX: 421 case POWER_SUPPLY_PROP_USB_TYPE: 422 return true; 423 default: 424 return false; 425 } 426 } 427 428 static const struct power_supply_desc ucs1002_charger_desc = { 429 .name = "ucs1002", 430 .type = POWER_SUPPLY_TYPE_USB, 431 .usb_types = ucs1002_usb_types, 432 .num_usb_types = ARRAY_SIZE(ucs1002_usb_types), 433 .get_property = ucs1002_get_property, 434 .set_property = ucs1002_set_property, 435 .property_is_writeable = ucs1002_property_is_writeable, 436 .properties = ucs1002_props, 437 .num_properties = ARRAY_SIZE(ucs1002_props), 438 }; 439 440 static void ucs1002_health_poll(struct work_struct *work) 441 { 442 struct ucs1002_info *info = container_of(work, struct ucs1002_info, 443 health_poll.work); 444 int ret; 445 u32 reg; 446 447 ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, ®); 448 if (ret) 449 return; 450 451 /* bad health and no status change, just schedule us again in a while */ 452 if ((reg & F_ERR) && info->health != POWER_SUPPLY_HEALTH_GOOD) { 453 schedule_delayed_work(&info->health_poll, 454 msecs_to_jiffies(2000)); 455 return; 456 } 457 458 if (reg & F_TSD) 459 info->health = POWER_SUPPLY_HEALTH_OVERHEAT; 460 else if (reg & (F_OVER_VOLT | F_BACK_VOLT)) 461 info->health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 462 else if (reg & F_OVER_ILIM) 463 info->health = POWER_SUPPLY_HEALTH_OVERCURRENT; 464 else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT)) 465 info->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 466 else 467 info->health = POWER_SUPPLY_HEALTH_GOOD; 468 469 sysfs_notify(&info->charger->dev.kobj, NULL, "health"); 470 } 471 472 static irqreturn_t ucs1002_charger_irq(int irq, void *data) 473 { 474 int ret, regval; 475 bool present; 476 struct ucs1002_info *info = data; 477 478 present = info->present; 479 480 ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, ®val); 481 if (ret) 482 return IRQ_HANDLED; 483 484 /* update attached status */ 485 info->present = regval & F_ADET_PIN; 486 487 /* notify the change */ 488 if (present != info->present) 489 power_supply_changed(info->charger); 490 491 return IRQ_HANDLED; 492 } 493 494 static irqreturn_t ucs1002_alert_irq(int irq, void *data) 495 { 496 struct ucs1002_info *info = data; 497 498 mod_delayed_work(system_wq, &info->health_poll, 0); 499 500 return IRQ_HANDLED; 501 } 502 503 static int ucs1002_regulator_enable(struct regulator_dev *rdev) 504 { 505 struct ucs1002_info *info = rdev_get_drvdata(rdev); 506 507 /* 508 * If the output is disabled due to 0 maximum current, just pretend the 509 * enable did work. The regulator will be enabled as soon as we get a 510 * a non-zero maximum current budget. 511 */ 512 if (info->output_disable) 513 return 0; 514 515 return regulator_enable_regmap(rdev); 516 } 517 518 static const struct regulator_ops ucs1002_regulator_ops = { 519 .is_enabled = regulator_is_enabled_regmap, 520 .enable = ucs1002_regulator_enable, 521 .disable = regulator_disable_regmap, 522 }; 523 524 static const struct regulator_desc ucs1002_regulator_descriptor = { 525 .name = "ucs1002-vbus", 526 .ops = &ucs1002_regulator_ops, 527 .type = REGULATOR_VOLTAGE, 528 .owner = THIS_MODULE, 529 .enable_reg = UCS1002_REG_SWITCH_CFG, 530 .enable_mask = F_PWR_EN_SET, 531 .enable_val = F_PWR_EN_SET, 532 .fixed_uV = 5000000, 533 .n_voltages = 1, 534 }; 535 536 static int ucs1002_probe(struct i2c_client *client) 537 { 538 struct device *dev = &client->dev; 539 struct power_supply_config charger_config = {}; 540 const struct regmap_config regmap_config = { 541 .reg_bits = 8, 542 .val_bits = 8, 543 }; 544 struct regulator_config regulator_config = {}; 545 int irq_a_det, irq_alert, ret; 546 struct ucs1002_info *info; 547 unsigned int regval; 548 549 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 550 if (!info) 551 return -ENOMEM; 552 553 info->regmap = devm_regmap_init_i2c(client, ®map_config); 554 ret = PTR_ERR_OR_ZERO(info->regmap); 555 if (ret) { 556 dev_err(dev, "Regmap initialization failed: %d\n", ret); 557 return ret; 558 } 559 560 info->client = client; 561 562 irq_a_det = of_irq_get_byname(dev->of_node, "a_det"); 563 irq_alert = of_irq_get_byname(dev->of_node, "alert"); 564 565 charger_config.of_node = dev->of_node; 566 charger_config.drv_data = info; 567 568 ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, ®val); 569 if (ret) { 570 dev_err(dev, "Failed to read product ID: %d\n", ret); 571 return ret; 572 } 573 574 if (regval != UCS1002_PRODUCT_ID) { 575 dev_err(dev, 576 "Product ID does not match (0x%02x != 0x%02x)\n", 577 regval, UCS1002_PRODUCT_ID); 578 return -ENODEV; 579 } 580 581 /* Enable charge rationing by default */ 582 ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG, 583 F_RATION_EN, F_RATION_EN); 584 if (ret) { 585 dev_err(dev, "Failed to read general config: %d\n", ret); 586 return ret; 587 } 588 589 /* 590 * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active 591 * mode selection to BC1.2 CDP. 592 */ 593 ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG, 594 V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE, 595 V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE); 596 if (ret) { 597 dev_err(dev, "Failed to configure default mode: %d\n", ret); 598 return ret; 599 } 600 /* 601 * Be safe and set initial current limit to 500mA 602 */ 603 ret = ucs1002_set_max_current(info, 500000); 604 if (ret) { 605 dev_err(dev, "Failed to set max current default: %d\n", ret); 606 return ret; 607 } 608 609 info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc, 610 &charger_config); 611 ret = PTR_ERR_OR_ZERO(info->charger); 612 if (ret) { 613 dev_err(dev, "Failed to register power supply: %d\n", ret); 614 return ret; 615 } 616 617 ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, ®val); 618 if (ret) { 619 dev_err(dev, "Failed to read pin status: %d\n", ret); 620 return ret; 621 } 622 623 info->regulator_descriptor = 624 devm_kmemdup(dev, &ucs1002_regulator_descriptor, 625 sizeof(ucs1002_regulator_descriptor), 626 GFP_KERNEL); 627 if (!info->regulator_descriptor) 628 return -ENOMEM; 629 630 info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN); 631 632 regulator_config.dev = dev; 633 regulator_config.of_node = dev->of_node; 634 regulator_config.regmap = info->regmap; 635 regulator_config.driver_data = info; 636 637 info->rdev = devm_regulator_register(dev, info->regulator_descriptor, 638 ®ulator_config); 639 ret = PTR_ERR_OR_ZERO(info->rdev); 640 if (ret) { 641 dev_err(dev, "Failed to register VBUS regulator: %d\n", ret); 642 return ret; 643 } 644 645 info->health = POWER_SUPPLY_HEALTH_GOOD; 646 INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll); 647 648 if (irq_a_det > 0) { 649 ret = devm_request_threaded_irq(dev, irq_a_det, NULL, 650 ucs1002_charger_irq, 651 IRQF_ONESHOT, 652 "ucs1002-a_det", info); 653 if (ret) { 654 dev_err(dev, "Failed to request A_DET threaded irq: %d\n", 655 ret); 656 return ret; 657 } 658 } 659 660 if (irq_alert > 0) { 661 ret = devm_request_irq(dev, irq_alert, ucs1002_alert_irq, 662 0,"ucs1002-alert", info); 663 if (ret) { 664 dev_err(dev, "Failed to request ALERT threaded irq: %d\n", 665 ret); 666 return ret; 667 } 668 } 669 670 return 0; 671 } 672 673 static const struct of_device_id ucs1002_of_match[] = { 674 { .compatible = "microchip,ucs1002", }, 675 { /* sentinel */ }, 676 }; 677 MODULE_DEVICE_TABLE(of, ucs1002_of_match); 678 679 static struct i2c_driver ucs1002_driver = { 680 .driver = { 681 .name = "ucs1002", 682 .of_match_table = ucs1002_of_match, 683 }, 684 .probe = ucs1002_probe, 685 }; 686 module_i2c_driver(ucs1002_driver); 687 688 MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller"); 689 MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>"); 690 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>"); 691 MODULE_LICENSE("GPL"); 692