ucs1002_power.c

  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(info->regmap, UCS1002_REG_OTHER_STATUS, &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(info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE,
187			       &reg, 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(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, &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(info->regmap, UCS1002_REG_ILIMIT, &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(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, &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(info->rdev))
294		regulator_enable_regmap(info->rdev);
295
296	return 0;
297}
298
299static 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
330static 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, &reg);
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
364static 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
395static 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
411static 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
423static 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
438static 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, &reg);
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
470static 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, &regval);
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
492static irqreturn_t ucs1002_alert_irq(int irq, void *data)
493{
494	struct ucs1002_info *info = data;
495
496	mod_delayed_work(system_percpu_wq, &info->health_poll, 0);
497
498	return IRQ_HANDLED;
499}
500
501static 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
516static 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
522static 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
534static 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, &regmap_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.fwnode = dev_fwnode(dev);
564	charger_config.drv_data = info;
565
566	ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, &regval);
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, &regval);
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				       &regulator_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
671static const struct of_device_id ucs1002_of_match[] = {
672	{ .compatible = "microchip,ucs1002", },
673	{ /* sentinel */ },
674};
675MODULE_DEVICE_TABLE(of, ucs1002_of_match);
676
677static struct i2c_driver ucs1002_driver = {
678	.driver = {
679		   .name = "ucs1002",
680		   .of_match_table = ucs1002_of_match,
681	},
682	.probe = ucs1002_probe,
683};
684module_i2c_driver(ucs1002_driver);
685
686MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller");
687MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
688MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
689MODULE_LICENSE("GPL");