xref: /openbmc/linux/drivers/regulator/ltc3676.c (revision 502aba81)
137b918a0STim Harvey /*
237b918a0STim Harvey  * Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved.
337b918a0STim Harvey  *
437b918a0STim Harvey  * This program is free software; you can redistribute it and/or modify
537b918a0STim Harvey  * it under the terms of the GNU General Public License version 2
637b918a0STim Harvey  * as published by the Free Software Foundation.
737b918a0STim Harvey  *
837b918a0STim Harvey  * This program is distributed in the hope that it will be useful,
937b918a0STim Harvey  * but WITHOUT ANY WARRANTY; without even the implied warranty of
1037b918a0STim Harvey  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
1137b918a0STim Harvey  * GNU General Public License for more details.
1237b918a0STim Harvey  *
1337b918a0STim Harvey  */
1437b918a0STim Harvey #include <linux/i2c.h>
1537b918a0STim Harvey #include <linux/init.h>
1637b918a0STim Harvey #include <linux/interrupt.h>
1737b918a0STim Harvey #include <linux/module.h>
1837b918a0STim Harvey #include <linux/kernel.h>
1937b918a0STim Harvey #include <linux/of.h>
2037b918a0STim Harvey #include <linux/regmap.h>
2137b918a0STim Harvey #include <linux/regulator/driver.h>
2237b918a0STim Harvey #include <linux/regulator/machine.h>
2337b918a0STim Harvey #include <linux/regulator/of_regulator.h>
2437b918a0STim Harvey 
2537b918a0STim Harvey #define DRIVER_NAME		"ltc3676"
2637b918a0STim Harvey 
2737b918a0STim Harvey /* LTC3676 Registers */
2837b918a0STim Harvey #define LTC3676_BUCK1     0x01
2937b918a0STim Harvey #define LTC3676_BUCK2     0x02
3037b918a0STim Harvey #define LTC3676_BUCK3     0x03
3137b918a0STim Harvey #define LTC3676_BUCK4     0x04
3237b918a0STim Harvey #define LTC3676_LDOA      0x05
3337b918a0STim Harvey #define LTC3676_LDOB      0x06
3437b918a0STim Harvey #define LTC3676_SQD1      0x07
3537b918a0STim Harvey #define LTC3676_SQD2      0x08
3637b918a0STim Harvey #define LTC3676_CNTRL     0x09
3737b918a0STim Harvey #define LTC3676_DVB1A     0x0A
3837b918a0STim Harvey #define LTC3676_DVB1B     0x0B
3937b918a0STim Harvey #define LTC3676_DVB2A     0x0C
4037b918a0STim Harvey #define LTC3676_DVB2B     0x0D
4137b918a0STim Harvey #define LTC3676_DVB3A     0x0E
4237b918a0STim Harvey #define LTC3676_DVB3B     0x0F
4337b918a0STim Harvey #define LTC3676_DVB4A     0x10
4437b918a0STim Harvey #define LTC3676_DVB4B     0x11
4537b918a0STim Harvey #define LTC3676_MSKIRQ    0x12
4637b918a0STim Harvey #define LTC3676_MSKPG     0x13
4737b918a0STim Harvey #define LTC3676_USER      0x14
4837b918a0STim Harvey #define LTC3676_IRQSTAT   0x15
4937b918a0STim Harvey #define LTC3676_PGSTATL   0x16
5037b918a0STim Harvey #define LTC3676_PGSTATRT  0x17
5137b918a0STim Harvey #define LTC3676_HRST      0x1E
5237b918a0STim Harvey #define LTC3676_CLIRQ     0x1F
5337b918a0STim Harvey 
5437b918a0STim Harvey #define LTC3676_DVBxA_REF_SELECT	BIT(5)
55d2a66ddfSMarek Vasut #define LTC3676_DVBxB_PGOOD_MASK	BIT(5)
5637b918a0STim Harvey 
5737b918a0STim Harvey #define LTC3676_IRQSTAT_PGOOD_TIMEOUT	BIT(3)
5837b918a0STim Harvey #define LTC3676_IRQSTAT_UNDERVOLT_WARN	BIT(4)
5937b918a0STim Harvey #define LTC3676_IRQSTAT_UNDERVOLT_FAULT	BIT(5)
6037b918a0STim Harvey #define LTC3676_IRQSTAT_THERMAL_WARN	BIT(6)
6137b918a0STim Harvey #define LTC3676_IRQSTAT_THERMAL_FAULT	BIT(7)
6237b918a0STim Harvey 
6337b918a0STim Harvey enum ltc3676_reg {
6437b918a0STim Harvey 	LTC3676_SW1,
6537b918a0STim Harvey 	LTC3676_SW2,
6637b918a0STim Harvey 	LTC3676_SW3,
6737b918a0STim Harvey 	LTC3676_SW4,
6837b918a0STim Harvey 	LTC3676_LDO1,
6937b918a0STim Harvey 	LTC3676_LDO2,
7037b918a0STim Harvey 	LTC3676_LDO3,
7137b918a0STim Harvey 	LTC3676_LDO4,
7237b918a0STim Harvey 	LTC3676_NUM_REGULATORS,
7337b918a0STim Harvey };
7437b918a0STim Harvey 
7537b918a0STim Harvey struct ltc3676 {
7637b918a0STim Harvey 	struct regmap *regmap;
7737b918a0STim Harvey 	struct device *dev;
7837b918a0STim Harvey 	struct regulator_desc regulator_descs[LTC3676_NUM_REGULATORS];
7937b918a0STim Harvey 	struct regulator_dev *regulators[LTC3676_NUM_REGULATORS];
8037b918a0STim Harvey };
8137b918a0STim Harvey 
8237b918a0STim Harvey static int ltc3676_set_suspend_voltage(struct regulator_dev *rdev, int uV)
8337b918a0STim Harvey {
8437b918a0STim Harvey 	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
8537b918a0STim Harvey 	struct device *dev = ltc3676->dev;
8637b918a0STim Harvey 	int dcdc = rdev_get_id(rdev);
8737b918a0STim Harvey 	int sel;
8837b918a0STim Harvey 
8937b918a0STim Harvey 	dev_dbg(dev, "%s id=%d uV=%d\n", __func__, dcdc, uV);
9037b918a0STim Harvey 	sel = regulator_map_voltage_linear(rdev, uV, uV);
9137b918a0STim Harvey 	if (sel < 0)
9237b918a0STim Harvey 		return sel;
9337b918a0STim Harvey 
9437b918a0STim Harvey 	/* DVBB register follows right after the corresponding DVBA register */
9537b918a0STim Harvey 	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
9637b918a0STim Harvey 				  rdev->desc->vsel_mask, sel);
9737b918a0STim Harvey }
9837b918a0STim Harvey 
9937b918a0STim Harvey static int ltc3676_set_suspend_mode(struct regulator_dev *rdev,
10037b918a0STim Harvey 				    unsigned int mode)
10137b918a0STim Harvey {
10237b918a0STim Harvey 	struct ltc3676 *ltc3676= rdev_get_drvdata(rdev);
10337b918a0STim Harvey 	struct device *dev = ltc3676->dev;
10437b918a0STim Harvey 	int mask, val;
10537b918a0STim Harvey 	int dcdc = rdev_get_id(rdev);
10637b918a0STim Harvey 
10737b918a0STim Harvey 	dev_dbg(dev, "%s id=%d mode=%d\n", __func__, dcdc, mode);
10837b918a0STim Harvey 
10937b918a0STim Harvey 	mask = LTC3676_DVBxA_REF_SELECT;
11037b918a0STim Harvey 	switch (mode) {
11137b918a0STim Harvey 	case REGULATOR_MODE_STANDBY:
11237b918a0STim Harvey 		val = 0; /* select DVBxA */
11337b918a0STim Harvey 		break;
11437b918a0STim Harvey 	case REGULATOR_MODE_NORMAL:
11537b918a0STim Harvey 		val = LTC3676_DVBxA_REF_SELECT; /* select DVBxB */
11637b918a0STim Harvey 		break;
11737b918a0STim Harvey 	default:
11837b918a0STim Harvey 		dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n",
11937b918a0STim Harvey 			 rdev->desc->name, mode);
12037b918a0STim Harvey 		return -EINVAL;
12137b918a0STim Harvey 	}
12237b918a0STim Harvey 
12337b918a0STim Harvey 	return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg,
12437b918a0STim Harvey 				  mask, val);
12537b918a0STim Harvey }
12637b918a0STim Harvey 
127d2a66ddfSMarek Vasut static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
128d2a66ddfSMarek Vasut {
129d2a66ddfSMarek Vasut 	struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
130d2a66ddfSMarek Vasut 	struct device *dev = ltc3676->dev;
131d2a66ddfSMarek Vasut 	int ret, dcdc = rdev_get_id(rdev);
132d2a66ddfSMarek Vasut 
133d2a66ddfSMarek Vasut 	dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector);
134d2a66ddfSMarek Vasut 
135d2a66ddfSMarek Vasut 	ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
136d2a66ddfSMarek Vasut 				 LTC3676_DVBxB_PGOOD_MASK,
137d2a66ddfSMarek Vasut 				 LTC3676_DVBxB_PGOOD_MASK);
138d2a66ddfSMarek Vasut 	if (ret)
139d2a66ddfSMarek Vasut 		return ret;
140d2a66ddfSMarek Vasut 
141d2a66ddfSMarek Vasut 	return regulator_set_voltage_sel_regmap(rdev, selector);
142d2a66ddfSMarek Vasut }
143d2a66ddfSMarek Vasut 
14437b918a0STim Harvey static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2)
14537b918a0STim Harvey {
14637b918a0STim Harvey 	uint64_t tmp;
14737b918a0STim Harvey 	if (uV == 0)
14837b918a0STim Harvey 		return 0;
14937b918a0STim Harvey 	tmp = (uint64_t)uV * r1;
15037b918a0STim Harvey 	do_div(tmp, r2);
15137b918a0STim Harvey 	return uV + (unsigned int)tmp;
15237b918a0STim Harvey }
15337b918a0STim Harvey 
15437b918a0STim Harvey static int ltc3676_of_parse_cb(struct device_node *np,
15537b918a0STim Harvey 			       const struct regulator_desc *desc,
15637b918a0STim Harvey 			       struct regulator_config *config)
15737b918a0STim Harvey {
15837b918a0STim Harvey 	struct ltc3676 *ltc3676 = config->driver_data;
15937b918a0STim Harvey 	struct regulator_desc *rdesc = &ltc3676->regulator_descs[desc->id];
16037b918a0STim Harvey 	u32 r[2];
16137b918a0STim Harvey 	int ret;
16237b918a0STim Harvey 
16337b918a0STim Harvey 	/* LDO3 has a fixed output */
16437b918a0STim Harvey 	if (desc->id == LTC3676_LDO3)
16537b918a0STim Harvey 		return 0;
16637b918a0STim Harvey 
16737b918a0STim Harvey 	ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2);
16837b918a0STim Harvey 	if (ret) {
16937b918a0STim Harvey 		dev_err(ltc3676->dev, "Failed to parse voltage divider: %d\n",
17037b918a0STim Harvey 			ret);
17137b918a0STim Harvey 		return ret;
17237b918a0STim Harvey 	}
17337b918a0STim Harvey 
17437b918a0STim Harvey 	rdesc->min_uV = ltc3676_scale(desc->min_uV, r[0], r[1]);
17537b918a0STim Harvey 	rdesc->uV_step = ltc3676_scale(desc->uV_step, r[0], r[1]);
17637b918a0STim Harvey 	rdesc->fixed_uV = ltc3676_scale(desc->fixed_uV, r[0], r[1]);
17737b918a0STim Harvey 
17837b918a0STim Harvey 	return 0;
17937b918a0STim Harvey }
18037b918a0STim Harvey 
18137b918a0STim Harvey /* SW1, SW2, SW3, SW4 linear 0.8V-3.3V with scalar via R1/R2 feeback res */
182f9e93accSBhumika Goyal static const struct regulator_ops ltc3676_linear_regulator_ops = {
18337b918a0STim Harvey 	.enable = regulator_enable_regmap,
18437b918a0STim Harvey 	.disable = regulator_disable_regmap,
18537b918a0STim Harvey 	.is_enabled = regulator_is_enabled_regmap,
18637b918a0STim Harvey 	.list_voltage = regulator_list_voltage_linear,
187d2a66ddfSMarek Vasut 	.set_voltage_sel = ltc3676_set_voltage_sel,
18837b918a0STim Harvey 	.get_voltage_sel = regulator_get_voltage_sel_regmap,
18937b918a0STim Harvey 	.set_suspend_voltage = ltc3676_set_suspend_voltage,
19037b918a0STim Harvey 	.set_suspend_mode = ltc3676_set_suspend_mode,
19137b918a0STim Harvey };
19237b918a0STim Harvey 
19337b918a0STim Harvey /* LDO1 always on fixed 0.8V-3.3V via scalar via R1/R2 feeback res */
194f9e93accSBhumika Goyal static const struct regulator_ops ltc3676_fixed_standby_regulator_ops = {
19537b918a0STim Harvey };
19637b918a0STim Harvey 
19737b918a0STim Harvey /* LDO2, LDO3 fixed (LDO2 has external scalar via R1/R2 feedback res) */
198f9e93accSBhumika Goyal static const struct regulator_ops ltc3676_fixed_regulator_ops = {
19937b918a0STim Harvey 	.enable = regulator_enable_regmap,
20037b918a0STim Harvey 	.disable = regulator_disable_regmap,
20137b918a0STim Harvey 	.is_enabled = regulator_is_enabled_regmap,
20237b918a0STim Harvey };
20337b918a0STim Harvey 
20437b918a0STim Harvey #define LTC3676_REG(_id, _name, _ops, en_reg, en_bit, dvba_reg, dvb_mask)   \
20537b918a0STim Harvey 	[LTC3676_ ## _id] = {                                        \
20637b918a0STim Harvey 		.name = #_name,                                \
20737b918a0STim Harvey 		.of_match = of_match_ptr(#_name),              \
20837b918a0STim Harvey 		.regulators_node = of_match_ptr("regulators"), \
20937b918a0STim Harvey 		.of_parse_cb = ltc3676_of_parse_cb,            \
21037b918a0STim Harvey 		.n_voltages = (dvb_mask) + 1,                  \
21137b918a0STim Harvey 		.min_uV = (dvba_reg) ? 412500 : 0,             \
21237b918a0STim Harvey 		.uV_step = (dvba_reg) ? 12500 : 0,             \
21337b918a0STim Harvey 		.ramp_delay = (dvba_reg) ? 800 : 0,            \
21437b918a0STim Harvey 		.fixed_uV = (dvb_mask) ? 0 : 725000,           \
21537b918a0STim Harvey 		.ops = &ltc3676_ ## _ops ## _regulator_ops,    \
21637b918a0STim Harvey 		.type = REGULATOR_VOLTAGE,                     \
21737b918a0STim Harvey 		.id = LTC3676_ ## _id,                         \
21837b918a0STim Harvey 		.owner = THIS_MODULE,                          \
21937b918a0STim Harvey 		.vsel_reg = (dvba_reg),                        \
22037b918a0STim Harvey 		.vsel_mask = (dvb_mask),                       \
22137b918a0STim Harvey 		.enable_reg = (en_reg),                        \
22237b918a0STim Harvey 		.enable_mask = (1 << en_bit),                  \
22337b918a0STim Harvey 	}
22437b918a0STim Harvey 
22537b918a0STim Harvey #define LTC3676_LINEAR_REG(_id, _name, _en, _dvba)                     \
22637b918a0STim Harvey 	LTC3676_REG(_id, _name, linear,                                \
22737b918a0STim Harvey 		    LTC3676_ ## _en, 7,                                \
22837b918a0STim Harvey 		    LTC3676_ ## _dvba, 0x1f)
22937b918a0STim Harvey 
23037b918a0STim Harvey #define LTC3676_FIXED_REG(_id, _name, _en_reg, _en_bit)                \
23137b918a0STim Harvey 	LTC3676_REG(_id, _name, fixed, LTC3676_ ## _en_reg, _en_bit, 0, 0)
23237b918a0STim Harvey 
23337b918a0STim Harvey static struct regulator_desc ltc3676_regulators[LTC3676_NUM_REGULATORS] = {
23437b918a0STim Harvey 	LTC3676_LINEAR_REG(SW1, sw1, BUCK1, DVB1A),
23537b918a0STim Harvey 	LTC3676_LINEAR_REG(SW2, sw2, BUCK2, DVB2A),
23637b918a0STim Harvey 	LTC3676_LINEAR_REG(SW3, sw3, BUCK3, DVB3A),
23737b918a0STim Harvey 	LTC3676_LINEAR_REG(SW4, sw4, BUCK4, DVB4A),
23837b918a0STim Harvey 	LTC3676_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0),
23937b918a0STim Harvey 	LTC3676_FIXED_REG(LDO2, ldo2, LDOA, 2),
24037b918a0STim Harvey 	LTC3676_FIXED_REG(LDO3, ldo3, LDOA, 5),
24137b918a0STim Harvey 	LTC3676_FIXED_REG(LDO4, ldo4, LDOB, 2),
24237b918a0STim Harvey };
24337b918a0STim Harvey 
244502aba81SAxel Lin static bool ltc3676_readable_writeable_reg(struct device *dev, unsigned int reg)
24537b918a0STim Harvey {
24637b918a0STim Harvey 	switch (reg) {
247502aba81SAxel Lin 	case LTC3676_BUCK1 ... LTC3676_IRQSTAT:
24837b918a0STim Harvey 	case LTC3676_HRST:
24937b918a0STim Harvey 	case LTC3676_CLIRQ:
25037b918a0STim Harvey 		return true;
25137b918a0STim Harvey 	}
25237b918a0STim Harvey 	return false;
25337b918a0STim Harvey }
25437b918a0STim Harvey 
25537b918a0STim Harvey static bool ltc3676_volatile_reg(struct device *dev, unsigned int reg)
25637b918a0STim Harvey {
25737b918a0STim Harvey 	switch (reg) {
258502aba81SAxel Lin 	case LTC3676_IRQSTAT ... LTC3676_PGSTATRT:
25937b918a0STim Harvey 		return true;
26037b918a0STim Harvey 	}
26137b918a0STim Harvey 	return false;
26237b918a0STim Harvey }
26337b918a0STim Harvey 
26437b918a0STim Harvey static const struct regmap_config ltc3676_regmap_config = {
26537b918a0STim Harvey 	.reg_bits = 8,
26637b918a0STim Harvey 	.val_bits = 8,
267502aba81SAxel Lin 	.writeable_reg = ltc3676_readable_writeable_reg,
268502aba81SAxel Lin 	.readable_reg = ltc3676_readable_writeable_reg,
26937b918a0STim Harvey 	.volatile_reg = ltc3676_volatile_reg,
27037b918a0STim Harvey 	.max_register = LTC3676_CLIRQ,
2711c96a2f6SDavid Frey 	.use_single_read = true,
2721c96a2f6SDavid Frey 	.use_single_write = true,
27337b918a0STim Harvey 	.cache_type = REGCACHE_RBTREE,
27437b918a0STim Harvey };
27537b918a0STim Harvey 
27637b918a0STim Harvey static irqreturn_t ltc3676_isr(int irq, void *dev_id)
27737b918a0STim Harvey {
27837b918a0STim Harvey 	struct ltc3676 *ltc3676 = dev_id;
27937b918a0STim Harvey 	struct device *dev = ltc3676->dev;
28037b918a0STim Harvey 	unsigned int i, irqstat, event;
28137b918a0STim Harvey 
28237b918a0STim Harvey 	regmap_read(ltc3676->regmap, LTC3676_IRQSTAT, &irqstat);
28337b918a0STim Harvey 
28437b918a0STim Harvey 	dev_dbg(dev, "irq%d irqstat=0x%02x\n", irq, irqstat);
28537b918a0STim Harvey 	if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) {
28637b918a0STim Harvey 		dev_warn(dev, "Over-temperature Warning\n");
28737b918a0STim Harvey 		event = REGULATOR_EVENT_OVER_TEMP;
28837b918a0STim Harvey 		for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
28937b918a0STim Harvey 			regulator_notifier_call_chain(ltc3676->regulators[i],
29037b918a0STim Harvey 						      event, NULL);
29137b918a0STim Harvey 	}
29237b918a0STim Harvey 
29337b918a0STim Harvey 	if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) {
29437b918a0STim Harvey 		dev_info(dev, "Undervoltage Warning\n");
29537b918a0STim Harvey 		event = REGULATOR_EVENT_UNDER_VOLTAGE;
29637b918a0STim Harvey 		for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
29737b918a0STim Harvey 			regulator_notifier_call_chain(ltc3676->regulators[i],
29837b918a0STim Harvey 						      event, NULL);
29937b918a0STim Harvey 	}
30037b918a0STim Harvey 
30137b918a0STim Harvey 	/* Clear warning condition */
30237b918a0STim Harvey 	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
30337b918a0STim Harvey 
30437b918a0STim Harvey 	return IRQ_HANDLED;
30537b918a0STim Harvey }
30637b918a0STim Harvey 
30737b918a0STim Harvey static int ltc3676_regulator_probe(struct i2c_client *client,
30837b918a0STim Harvey 				    const struct i2c_device_id *id)
30937b918a0STim Harvey {
31037b918a0STim Harvey 	struct device *dev = &client->dev;
31137b918a0STim Harvey 	struct regulator_init_data *init_data = dev_get_platdata(dev);
31237b918a0STim Harvey 	struct regulator_desc *descs;
31337b918a0STim Harvey 	struct ltc3676 *ltc3676;
31437b918a0STim Harvey 	int i, ret;
31537b918a0STim Harvey 
31637b918a0STim Harvey 	ltc3676 = devm_kzalloc(dev, sizeof(*ltc3676), GFP_KERNEL);
31737b918a0STim Harvey 	if (!ltc3676)
31837b918a0STim Harvey 		return -ENOMEM;
31937b918a0STim Harvey 
32037b918a0STim Harvey 	i2c_set_clientdata(client, ltc3676);
32137b918a0STim Harvey 	ltc3676->dev = dev;
32237b918a0STim Harvey 
32337b918a0STim Harvey 	descs = ltc3676->regulator_descs;
32437b918a0STim Harvey 	memcpy(descs, ltc3676_regulators, sizeof(ltc3676_regulators));
32537b918a0STim Harvey 	descs[LTC3676_LDO3].fixed_uV = 1800000; /* LDO3 is fixed 1.8V */
32637b918a0STim Harvey 
32737b918a0STim Harvey 	ltc3676->regmap = devm_regmap_init_i2c(client, &ltc3676_regmap_config);
32837b918a0STim Harvey 	if (IS_ERR(ltc3676->regmap)) {
32937b918a0STim Harvey 		ret = PTR_ERR(ltc3676->regmap);
33037b918a0STim Harvey 		dev_err(dev, "failed to initialize regmap: %d\n", ret);
33137b918a0STim Harvey 		return ret;
33237b918a0STim Harvey 	}
33337b918a0STim Harvey 
33437b918a0STim Harvey 	for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
33537b918a0STim Harvey 		struct regulator_desc *desc = &ltc3676->regulator_descs[i];
33637b918a0STim Harvey 		struct regulator_config config = { };
33737b918a0STim Harvey 
33837b918a0STim Harvey 		if (init_data)
33937b918a0STim Harvey 			config.init_data = &init_data[i];
34037b918a0STim Harvey 
34137b918a0STim Harvey 		config.dev = dev;
34237b918a0STim Harvey 		config.driver_data = ltc3676;
34337b918a0STim Harvey 
34437b918a0STim Harvey 		ltc3676->regulators[i] = devm_regulator_register(dev, desc,
34537b918a0STim Harvey 								 &config);
34637b918a0STim Harvey 		if (IS_ERR(ltc3676->regulators[i])) {
34737b918a0STim Harvey 			ret = PTR_ERR(ltc3676->regulators[i]);
34837b918a0STim Harvey 			dev_err(dev, "failed to register regulator %s: %d\n",
34937b918a0STim Harvey 				desc->name, ret);
35037b918a0STim Harvey 			return ret;
35137b918a0STim Harvey 		}
35237b918a0STim Harvey 	}
35337b918a0STim Harvey 
35437b918a0STim Harvey 	regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0);
35537b918a0STim Harvey 	if (client->irq) {
35637b918a0STim Harvey 		ret = devm_request_threaded_irq(dev, client->irq, NULL,
35737b918a0STim Harvey 						ltc3676_isr,
35837b918a0STim Harvey 						IRQF_TRIGGER_LOW | IRQF_ONESHOT,
35937b918a0STim Harvey 						client->name, ltc3676);
36037b918a0STim Harvey 		if (ret) {
36137b918a0STim Harvey 			dev_err(dev, "Failed to request IRQ: %d\n", ret);
36237b918a0STim Harvey 			return ret;
36337b918a0STim Harvey 		}
36437b918a0STim Harvey 	}
36537b918a0STim Harvey 
36637b918a0STim Harvey 	return 0;
36737b918a0STim Harvey }
36837b918a0STim Harvey 
36937b918a0STim Harvey static const struct i2c_device_id ltc3676_i2c_id[] = {
37037b918a0STim Harvey 	{ "ltc3676" },
37137b918a0STim Harvey 	{ }
37237b918a0STim Harvey };
37337b918a0STim Harvey MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id);
37437b918a0STim Harvey 
375c3143415SJavier Martinez Canillas static const struct of_device_id ltc3676_of_match[] = {
376c3143415SJavier Martinez Canillas 	{ .compatible = "lltc,ltc3676" },
377c3143415SJavier Martinez Canillas 	{ },
378c3143415SJavier Martinez Canillas };
379c3143415SJavier Martinez Canillas MODULE_DEVICE_TABLE(of, ltc3676_of_match);
380c3143415SJavier Martinez Canillas 
38137b918a0STim Harvey static struct i2c_driver ltc3676_driver = {
38237b918a0STim Harvey 	.driver = {
38337b918a0STim Harvey 		.name = DRIVER_NAME,
384c3143415SJavier Martinez Canillas 		.of_match_table = of_match_ptr(ltc3676_of_match),
38537b918a0STim Harvey 	},
38637b918a0STim Harvey 	.probe = ltc3676_regulator_probe,
38737b918a0STim Harvey 	.id_table = ltc3676_i2c_id,
38837b918a0STim Harvey };
38937b918a0STim Harvey module_i2c_driver(ltc3676_driver);
39037b918a0STim Harvey 
39137b918a0STim Harvey MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
39237b918a0STim Harvey MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC1376");
39337b918a0STim Harvey MODULE_LICENSE("GPL v2");
394