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
99struct 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
112static 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
123static 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(map: info->regmap, UCS1002_REG_OTHER_STATUS, val: &reg);
130 if (ret)
131 return ret;
132
133 val->intval = !!(reg & F_CHG_ACT);
134
135 return 0;
136}
137
138static 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(map: info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE,
187 val: &reg, val_count: 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
200static 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(map: info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, val: &reg);
216 if (ret)
217 return ret;
218
219 current_measurement = reg;
220 val->intval = 0;
221
222 for_each_set_bit(i, &current_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 */
232static const u32 ucs1002_current_limit_uA[] = {
233 500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000,
234};
235
236static 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(map: info->regmap, UCS1002_REG_ILIMIT, val: &reg);
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
256static 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(rdev: 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(map: info->regmap, UCS1002_REG_ILIMIT, val: 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(map: info->regmap, UCS1002_REG_ILIMIT, val: &reg);
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(rdev: info->rdev))
294 regulator_enable_regmap(rdev: info->rdev);
295
296 return 0;
297}
298
299static 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
307static 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(map: info->regmap, UCS1002_REG_SWITCH_CFG,
332 V_SET_ACTIVE_MODE_MASK, val: mode);
333}
334
335static 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(map: info->regmap, UCS1002_REG_PIN_STATUS, val: &reg);
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
369static 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
400static 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: val->intval);
409 case POWER_SUPPLY_PROP_USB_TYPE:
410 return ucs1002_set_usb_type(info, val: val->intval);
411 default:
412 return -EINVAL;
413 }
414}
415
416static 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
428static 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
440static 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(map: info->regmap, UCS1002_REG_INTERRUPT_STATUS, val: &reg);
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(dwork: &info->health_poll,
454 delay: msecs_to_jiffies(m: 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(kobj: &info->charger->dev.kobj, NULL, attr: "health");
470}
471
472static 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(map: info->regmap, UCS1002_REG_OTHER_STATUS, val: &regval);
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(psy: info->charger);
490
491 return IRQ_HANDLED;
492}
493
494static irqreturn_t ucs1002_alert_irq(int irq, void *data)
495{
496 struct ucs1002_info *info = data;
497
498 mod_delayed_work(wq: system_wq, dwork: &info->health_poll, delay: 0);
499
500 return IRQ_HANDLED;
501}
502
503static 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
518static 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
524static 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
536static 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, size: sizeof(*info), GFP_KERNEL);
550 if (!info)
551 return -ENOMEM;
552
553 info->regmap = devm_regmap_init_i2c(client, &regmap_config);
554 ret = PTR_ERR_OR_ZERO(ptr: 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: dev->of_node, name: "a_det");
563 irq_alert = of_irq_get_byname(dev: dev->of_node, name: "alert");
564
565 charger_config.of_node = dev->of_node;
566 charger_config.drv_data = info;
567
568 ret = regmap_read(map: info->regmap, UCS1002_REG_PRODUCT_ID, val: &regval);
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(map: 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(map: 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, val: 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(parent: dev, desc: &ucs1002_charger_desc,
610 cfg: &charger_config);
611 ret = PTR_ERR_OR_ZERO(ptr: 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(map: info->regmap, UCS1002_REG_PIN_STATUS, val: &regval);
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, src: &ucs1002_regulator_descriptor,
625 len: 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, regulator_desc: info->regulator_descriptor,
638 config: &regulator_config);
639 ret = PTR_ERR_OR_ZERO(ptr: 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: irq_a_det, NULL,
650 thread_fn: ucs1002_charger_irq,
651 IRQF_ONESHOT,
652 devname: "ucs1002-a_det", dev_id: 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: irq_alert, handler: ucs1002_alert_irq,
662 irqflags: 0,devname: "ucs1002-alert", dev_id: 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
673static const struct of_device_id ucs1002_of_match[] = {
674 { .compatible = "microchip,ucs1002", },
675 { /* sentinel */ },
676};
677MODULE_DEVICE_TABLE(of, ucs1002_of_match);
678
679static struct i2c_driver ucs1002_driver = {
680 .driver = {
681 .name = "ucs1002",
682 .of_match_table = ucs1002_of_match,
683 },
684 .probe = ucs1002_probe,
685};
686module_i2c_driver(ucs1002_driver);
687
688MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller");
689MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
690MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
691MODULE_LICENSE("GPL");
692

source code of linux/drivers/power/supply/ucs1002_power.c