[deliverable/linux.git] / drivers / regulator / pwm-regulator.c

/*
 * Regulator driver for PWM Regulators
 *
 * Copyright (C) 2014 - STMicroelectronics Inc.
 *
 * Author: Lee Jones <lee.jones@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pwm.h>
#include <linux/gpio/consumer.h>

struct pwm_regulator_data {
	/*  Shared */
	struct pwm_device *pwm;

	/* Voltage table */
	struct pwm_voltages *duty_cycle_table;

	/* regulator descriptor */
	struct regulator_desc desc;

	/* Regulator ops */
	struct regulator_ops ops;

	int state;

	/* Continuous voltage */
	int volt_uV;

	/* Enable GPIO */
	struct gpio_desc *enb_gpio;
};

struct pwm_voltages {
	unsigned int uV;
	unsigned int dutycycle;
};

/**
 * Voltage table call-backs
 */
static void pwm_regulator_init_state(struct regulator_dev *rdev)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
	struct pwm_state pwm_state;
	unsigned int dutycycle;
	int i;

	pwm_get_state(drvdata->pwm, &pwm_state);
	dutycycle = pwm_get_relative_duty_cycle(&pwm_state, 100);

	for (i = 0; i < rdev->desc->n_voltages; i++) {
		if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) {
			drvdata->state = i;
			return;
		}
	}
}

static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);

	if (drvdata->state < 0)
		pwm_regulator_init_state(rdev);

	return drvdata->state;
}

static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev,
					 unsigned selector)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
	struct pwm_state pstate;
	int ret;

	pwm_init_state(drvdata->pwm, &pstate);
	pwm_set_relative_duty_cycle(&pstate,
			drvdata->duty_cycle_table[selector].dutycycle, 100);

	ret = pwm_apply_state(drvdata->pwm, &pstate);
	if (ret) {
		dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
		return ret;
	}

	drvdata->state = selector;

	return 0;
}

static int pwm_regulator_list_voltage(struct regulator_dev *rdev,
				      unsigned selector)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);

	if (selector >= rdev->desc->n_voltages)
		return -EINVAL;

	return drvdata->duty_cycle_table[selector].uV;
}

static int pwm_regulator_enable(struct regulator_dev *dev)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);

	if (drvdata->enb_gpio)
		gpiod_set_value_cansleep(drvdata->enb_gpio, 1);

	return pwm_enable(drvdata->pwm);
}

static int pwm_regulator_disable(struct regulator_dev *dev)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);

	pwm_disable(drvdata->pwm);

	if (drvdata->enb_gpio)
		gpiod_set_value_cansleep(drvdata->enb_gpio, 0);

	return 0;
}

static int pwm_regulator_is_enabled(struct regulator_dev *dev)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);

	if (drvdata->enb_gpio && !gpiod_get_value_cansleep(drvdata->enb_gpio))
		return false;

	return pwm_is_enabled(drvdata->pwm);
}

static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);

	return drvdata->volt_uV;
}

static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
					int min_uV, int max_uV,
					unsigned *selector)
{
	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
	unsigned int ramp_delay = rdev->constraints->ramp_delay;
	unsigned int req_diff = min_uV - rdev->constraints->min_uV;
	struct pwm_state pstate;
	unsigned int diff;
	int old_uV = pwm_regulator_get_voltage(rdev);
	int ret;

	pwm_init_state(drvdata->pwm, &pstate);
	diff = rdev->constraints->max_uV - rdev->constraints->min_uV;

	/* We pass diff as the scale to get a uV precision. */
	pwm_set_relative_duty_cycle(&pstate, req_diff, diff);

	ret = pwm_apply_state(drvdata->pwm, &pstate);
	if (ret) {
		dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
		return ret;
	}

	drvdata->volt_uV = min_uV;

	if ((ramp_delay == 0) || !pwm_regulator_is_enabled(rdev))
		return 0;

	/* Ramp delay is in uV/uS. Adjust to uS and delay */
	ramp_delay = DIV_ROUND_UP(abs(min_uV - old_uV), ramp_delay);
	usleep_range(ramp_delay, ramp_delay + DIV_ROUND_UP(ramp_delay, 10));

	return 0;
}

static struct regulator_ops pwm_regulator_voltage_table_ops = {
	.set_voltage_sel = pwm_regulator_set_voltage_sel,
	.get_voltage_sel = pwm_regulator_get_voltage_sel,
	.list_voltage    = pwm_regulator_list_voltage,
	.map_voltage     = regulator_map_voltage_iterate,
	.enable          = pwm_regulator_enable,
	.disable         = pwm_regulator_disable,
	.is_enabled      = pwm_regulator_is_enabled,
};

static struct regulator_ops pwm_regulator_voltage_continuous_ops = {
	.get_voltage = pwm_regulator_get_voltage,
	.set_voltage = pwm_regulator_set_voltage,
	.enable          = pwm_regulator_enable,
	.disable         = pwm_regulator_disable,
	.is_enabled      = pwm_regulator_is_enabled,
};

static struct regulator_desc pwm_regulator_desc = {
	.name		= "pwm-regulator",
	.type		= REGULATOR_VOLTAGE,
	.owner		= THIS_MODULE,
	.supply_name    = "pwm",
};

static int pwm_regulator_init_table(struct platform_device *pdev,
				    struct pwm_regulator_data *drvdata)
{
	struct device_node *np = pdev->dev.of_node;
	struct pwm_voltages *duty_cycle_table;
	unsigned int length = 0;
	int ret;

	of_find_property(np, "voltage-table", &length);

	if ((length < sizeof(*duty_cycle_table)) ||
	    (length % sizeof(*duty_cycle_table))) {
		dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",
			length);
		return -EINVAL;
	}

	duty_cycle_table = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
	if (!duty_cycle_table)
		return -ENOMEM;

	ret = of_property_read_u32_array(np, "voltage-table",
					 (u32 *)duty_cycle_table,
					 length / sizeof(u32));
	if (ret) {
		dev_err(&pdev->dev, "Failed to read voltage-table: %d\n", ret);
		return ret;
	}

	drvdata->state			= -EINVAL;
	drvdata->duty_cycle_table	= duty_cycle_table;
	memcpy(&drvdata->ops, &pwm_regulator_voltage_table_ops,
	       sizeof(drvdata->ops));
	drvdata->desc.ops = &drvdata->ops;
	drvdata->desc.n_voltages	= length / sizeof(*duty_cycle_table);

	return 0;
}

static int pwm_regulator_init_continuous(struct platform_device *pdev,
					 struct pwm_regulator_data *drvdata)
{
	memcpy(&drvdata->ops, &pwm_regulator_voltage_continuous_ops,
	       sizeof(drvdata->ops));
	drvdata->desc.ops = &drvdata->ops;
	drvdata->desc.continuous_voltage_range = true;

	return 0;
}

static int pwm_regulator_probe(struct platform_device *pdev)
{
	const struct regulator_init_data *init_data;
	struct pwm_regulator_data *drvdata;
	struct regulator_dev *regulator;
	struct regulator_config config = { };
	struct device_node *np = pdev->dev.of_node;
	enum gpiod_flags gpio_flags;
	int ret;

	if (!np) {
		dev_err(&pdev->dev, "Device Tree node missing\n");
		return -EINVAL;
	}

	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
		return -ENOMEM;

	memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(drvdata->desc));

	if (of_find_property(np, "voltage-table", NULL))
		ret = pwm_regulator_init_table(pdev, drvdata);
	else
		ret = pwm_regulator_init_continuous(pdev, drvdata);
	if (ret)
		return ret;

	init_data = of_get_regulator_init_data(&pdev->dev, np,
					       &drvdata->desc);
	if (!init_data)
		return -ENOMEM;

	config.of_node = np;
	config.dev = &pdev->dev;
	config.driver_data = drvdata;
	config.init_data = init_data;

	drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
	if (IS_ERR(drvdata->pwm)) {
		ret = PTR_ERR(drvdata->pwm);
		dev_err(&pdev->dev, "Failed to get PWM: %d\n", ret);
		return ret;
	}

	if (init_data->constraints.boot_on || init_data->constraints.always_on)
		gpio_flags = GPIOD_OUT_HIGH;
	else
		gpio_flags = GPIOD_OUT_LOW;
	drvdata->enb_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
						    gpio_flags);
	if (IS_ERR(drvdata->enb_gpio)) {
		ret = PTR_ERR(drvdata->enb_gpio);
		dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", ret);
		return ret;
	}

	ret = pwm_adjust_config(drvdata->pwm);
	if (ret)
		return ret;

	regulator = devm_regulator_register(&pdev->dev,
					    &drvdata->desc, &config);
	if (IS_ERR(regulator)) {
		ret = PTR_ERR(regulator);
		dev_err(&pdev->dev, "Failed to register regulator %s: %d\n",
			drvdata->desc.name, ret);
		return ret;
	}

	return 0;
}

static const struct of_device_id pwm_of_match[] = {
	{ .compatible = "pwm-regulator" },
	{ },
};
MODULE_DEVICE_TABLE(of, pwm_of_match);

static struct platform_driver pwm_regulator_driver = {
	.driver = {
		.name		= "pwm-regulator",
		.of_match_table = of_match_ptr(pwm_of_match),
	},
	.probe = pwm_regulator_probe,
};

module_platform_driver(pwm_regulator_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>");
MODULE_DESCRIPTION("PWM Regulator Driver");
MODULE_ALIAS("platform:pwm-regulator");
Commit	Line	Data
aa66cc66 CZ	1	/*
	2	* Regulator driver for PWM Regulators
	3	*
	4	* Copyright (C) 2014 - STMicroelectronics Inc.
	5	*
	6	* Author: Lee Jones <lee.jones@linaro.org>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
4773be18	13	#include <linux/delay.h>
aa66cc66 CZ	14	#include <linux/module.h>
	15	#include <linux/init.h>
	16	#include <linux/err.h>
	17	#include <linux/regulator/driver.h>
	18	#include <linux/regulator/machine.h>
	19	#include <linux/regulator/of_regulator.h>
	20	#include <linux/of.h>
	21	#include <linux/of_device.h>
	22	#include <linux/pwm.h>
27bfa889	23	#include <linux/gpio/consumer.h>
aa66cc66 CZ	24
aa66cc66 CZ	25	struct pwm_regulator_data {
4773be18	26	/* Shared */
aa66cc66	27	struct pwm_device *pwm;
4773be18 LJ	28
	29	/* Voltage table */
	30	struct pwm_voltages *duty_cycle_table;
f907a0a9 LD	31
	32	/* regulator descriptor */
	33	struct regulator_desc desc;
	34
	35	/* Regulator ops */
	36	struct regulator_ops ops;
	37
aa66cc66	38	int state;
4773be18 LJ	39
4773be18 LJ	40	/* Continuous voltage */
4773be18	41	int volt_uV;
27bfa889 AC	42
	43	/* Enable GPIO */
	44	struct gpio_desc *enb_gpio;
aa66cc66 CZ	45	};
	46
	47	struct pwm_voltages {
	48	unsigned int uV;
	49	unsigned int dutycycle;
	50	};
	51
4773be18 LJ	52	/**
	53	* Voltage table call-backs
	54	*/
87248991 BB	55	static void pwm_regulator_init_state(struct regulator_dev *rdev)
	56	{
	57	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
	58	struct pwm_state pwm_state;
	59	unsigned int dutycycle;
	60	int i;
	61
	62	pwm_get_state(drvdata->pwm, &pwm_state);
	63	dutycycle = pwm_get_relative_duty_cycle(&pwm_state, 100);
	64
	65	for (i = 0; i < rdev->desc->n_voltages; i++) {
	66	if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) {
	67	drvdata->state = i;
	68	return;
	69	}
	70	}
	71	}
	72
ab101e35	73	static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev)
aa66cc66	74	{
ab101e35	75	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
aa66cc66	76
87248991 BB	77	if (drvdata->state < 0)
	78	pwm_regulator_init_state(rdev);
	79
aa66cc66 CZ	80	return drvdata->state;
	81	}
	82
ab101e35	83	static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev,
aa66cc66 CZ	84	unsigned selector)
aa66cc66 CZ	85	{
ab101e35	86	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
3f4eb39b	87	struct pwm_state pstate;
aa66cc66 CZ	88	int ret;
aa66cc66 CZ	89
3f4eb39b BB	90	pwm_init_state(drvdata->pwm, &pstate);
	91	pwm_set_relative_duty_cycle(&pstate,
	92	drvdata->duty_cycle_table[selector].dutycycle, 100);
aa66cc66	93
3f4eb39b	94	ret = pwm_apply_state(drvdata->pwm, &pstate);
aa66cc66	95	if (ret) {
5bf59bd5	96	dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
aa66cc66 CZ	97	return ret;
	98	}
	99
	100	drvdata->state = selector;
	101
aa66cc66 CZ	102	return 0;
	103	}
	104
ab101e35	105	static int pwm_regulator_list_voltage(struct regulator_dev *rdev,
aa66cc66 CZ	106	unsigned selector)
aa66cc66 CZ	107	{
ab101e35	108	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
aa66cc66	109
ab101e35	110	if (selector >= rdev->desc->n_voltages)
aa66cc66 CZ	111	return -EINVAL;
	112
	113	return drvdata->duty_cycle_table[selector].uV;
	114	}
4773be18	115
1de7d802 BB	116	static int pwm_regulator_enable(struct regulator_dev *dev)
	117	{
	118	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
	119
27bfa889 AC	120	if (drvdata->enb_gpio)
	121	gpiod_set_value_cansleep(drvdata->enb_gpio, 1);
	122
1de7d802 BB	123	return pwm_enable(drvdata->pwm);
	124	}
	125
	126	static int pwm_regulator_disable(struct regulator_dev *dev)
	127	{
	128	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
	129
	130	pwm_disable(drvdata->pwm);
	131
27bfa889 AC	132	if (drvdata->enb_gpio)
	133	gpiod_set_value_cansleep(drvdata->enb_gpio, 0);
	134
1de7d802 BB	135	return 0;
	136	}
	137
	138	static int pwm_regulator_is_enabled(struct regulator_dev *dev)
	139	{
	140	struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
	141
27bfa889 AC	142	if (drvdata->enb_gpio && !gpiod_get_value_cansleep(drvdata->enb_gpio))
	143	return false;
	144
1de7d802 BB	145	return pwm_is_enabled(drvdata->pwm);
	146	}
	147
4773be18 LJ	148	static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
	149	{
	150	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
	151
	152	return drvdata->volt_uV;
	153	}
	154
	155	static int pwm_regulator_set_voltage(struct regulator_dev *rdev,
	156	int min_uV, int max_uV,
	157	unsigned *selector)
	158	{
	159	struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev);
	160	unsigned int ramp_delay = rdev->constraints->ramp_delay;
fd786fb0	161	unsigned int req_diff = min_uV - rdev->constraints->min_uV;
3f4eb39b	162	struct pwm_state pstate;
fd786fb0	163	unsigned int diff;
c2588393	164	int old_uV = pwm_regulator_get_voltage(rdev);
4773be18 LJ	165	int ret;
4773be18 LJ	166
3f4eb39b	167	pwm_init_state(drvdata->pwm, &pstate);
fd786fb0 LD	168	diff = rdev->constraints->max_uV - rdev->constraints->min_uV;
fd786fb0 LD	169
3f4eb39b BB	170	/* We pass diff as the scale to get a uV precision. */
3f4eb39b BB	171	pwm_set_relative_duty_cycle(&pstate, req_diff, diff);
4773be18	172
3f4eb39b	173	ret = pwm_apply_state(drvdata->pwm, &pstate);
4773be18	174	if (ret) {
5bf59bd5	175	dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret);
4773be18 LJ	176	return ret;
	177	}
	178
4773be18 LJ	179	drvdata->volt_uV = min_uV;
4773be18 LJ	180
c2588393 DA	181	if ((ramp_delay == 0) \|\| !pwm_regulator_is_enabled(rdev))
	182	return 0;
	183
	184	/* Ramp delay is in uV/uS. Adjust to uS and delay */
	185	ramp_delay = DIV_ROUND_UP(abs(min_uV - old_uV), ramp_delay);
	186	usleep_range(ramp_delay, ramp_delay + DIV_ROUND_UP(ramp_delay, 10));
4773be18 LJ	187
	188	return 0;
	189	}
	190
f9178dad	191	static struct regulator_ops pwm_regulator_voltage_table_ops = {
aa66cc66 CZ	192	.set_voltage_sel = pwm_regulator_set_voltage_sel,
	193	.get_voltage_sel = pwm_regulator_get_voltage_sel,
	194	.list_voltage = pwm_regulator_list_voltage,
	195	.map_voltage = regulator_map_voltage_iterate,
1de7d802 BB	196	.enable = pwm_regulator_enable,
	197	.disable = pwm_regulator_disable,
	198	.is_enabled = pwm_regulator_is_enabled,
aa66cc66 CZ	199	};
aa66cc66 CZ	200
4773be18 LJ	201	static struct regulator_ops pwm_regulator_voltage_continuous_ops = {
	202	.get_voltage = pwm_regulator_get_voltage,
	203	.set_voltage = pwm_regulator_set_voltage,
1de7d802 BB	204	.enable = pwm_regulator_enable,
	205	.disable = pwm_regulator_disable,
	206	.is_enabled = pwm_regulator_is_enabled,
4773be18 LJ	207	};
4773be18 LJ	208
b6f55e74	209	static struct regulator_desc pwm_regulator_desc = {
aa66cc66	210	.name = "pwm-regulator",
aa66cc66 CZ	211	.type = REGULATOR_VOLTAGE,
	212	.owner = THIS_MODULE,
	213	.supply_name = "pwm",
	214	};
	215
f9178dad LJ	216	static int pwm_regulator_init_table(struct platform_device *pdev,
	217	struct pwm_regulator_data *drvdata)
	218	{
	219	struct device_node *np = pdev->dev.of_node;
	220	struct pwm_voltages *duty_cycle_table;
60cb65eb	221	unsigned int length = 0;
f9178dad LJ	222	int ret;
	223
	224	of_find_property(np, "voltage-table", &length);
	225
	226	if ((length < sizeof(*duty_cycle_table)) \|\|
	227	(length % sizeof(*duty_cycle_table))) {
5bf59bd5	228	dev_err(&pdev->dev, "voltage-table length(%d) is invalid\n",
f9178dad LJ	229	length);
	230	return -EINVAL;
	231	}
	232
	233	duty_cycle_table = devm_kzalloc(&pdev->dev, length, GFP_KERNEL);
	234	if (!duty_cycle_table)
	235	return -ENOMEM;
	236
	237	ret = of_property_read_u32_array(np, "voltage-table",
	238	(u32 *)duty_cycle_table,
	239	length / sizeof(u32));
	240	if (ret) {
5bf59bd5	241	dev_err(&pdev->dev, "Failed to read voltage-table: %d\n", ret);
f9178dad LJ	242	return ret;
	243	}
	244
87248991	245	drvdata->state = -EINVAL;
f9178dad	246	drvdata->duty_cycle_table = duty_cycle_table;
f907a0a9 LD	247	memcpy(&drvdata->ops, &pwm_regulator_voltage_table_ops,
	248	sizeof(drvdata->ops));
	249	drvdata->desc.ops = &drvdata->ops;
	250	drvdata->desc.n_voltages = length / sizeof(*duty_cycle_table);
f9178dad LJ	251
	252	return 0;
	253	}
	254
4773be18 LJ	255	static int pwm_regulator_init_continuous(struct platform_device *pdev,
	256	struct pwm_regulator_data *drvdata)
	257	{
f907a0a9 LD	258	memcpy(&drvdata->ops, &pwm_regulator_voltage_continuous_ops,
	259	sizeof(drvdata->ops));
	260	drvdata->desc.ops = &drvdata->ops;
	261	drvdata->desc.continuous_voltage_range = true;
4773be18 LJ	262
	263	return 0;
	264	}
	265
aa66cc66 CZ	266	static int pwm_regulator_probe(struct platform_device *pdev)
aa66cc66 CZ	267	{
5ad2cb14	268	const struct regulator_init_data *init_data;
aa66cc66	269	struct pwm_regulator_data *drvdata;
aa66cc66 CZ	270	struct regulator_dev *regulator;
	271	struct regulator_config config = { };
	272	struct device_node *np = pdev->dev.of_node;
27bfa889	273	enum gpiod_flags gpio_flags;
f9178dad	274	int ret;
aa66cc66 CZ	275
	276	if (!np) {
	277	dev_err(&pdev->dev, "Device Tree node missing\n");
	278	return -EINVAL;
	279	}
	280
	281	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
	282	if (!drvdata)
	283	return -ENOMEM;
	284
f907a0a9 LD	285	memcpy(&drvdata->desc, &pwm_regulator_desc, sizeof(drvdata->desc));
f907a0a9 LD	286
4773be18	287	if (of_find_property(np, "voltage-table", NULL))
f9178dad	288	ret = pwm_regulator_init_table(pdev, drvdata);
4773be18 LJ	289	else
	290	ret = pwm_regulator_init_continuous(pdev, drvdata);
	291	if (ret)
	292	return ret;
aa66cc66	293
5ad2cb14	294	init_data = of_get_regulator_init_data(&pdev->dev, np,
f907a0a9	295	&drvdata->desc);
5ad2cb14	296	if (!init_data)
aa66cc66 CZ	297	return -ENOMEM;
	298
	299	config.of_node = np;
	300	config.dev = &pdev->dev;
	301	config.driver_data = drvdata;
5ad2cb14	302	config.init_data = init_data;
aa66cc66 CZ	303
	304	drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
	305	if (IS_ERR(drvdata->pwm)) {
5bf59bd5 LD	306	ret = PTR_ERR(drvdata->pwm);
	307	dev_err(&pdev->dev, "Failed to get PWM: %d\n", ret);
	308	return ret;
aa66cc66 CZ	309	}
aa66cc66 CZ	310
27bfa889 AC	311	if (init_data->constraints.boot_on \|\| init_data->constraints.always_on)
	312	gpio_flags = GPIOD_OUT_HIGH;
	313	else
	314	gpio_flags = GPIOD_OUT_LOW;
	315	drvdata->enb_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
	316	gpio_flags);
	317	if (IS_ERR(drvdata->enb_gpio)) {
	318	ret = PTR_ERR(drvdata->enb_gpio);
	319	dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", ret);
	320	return ret;
	321	}
	322
fd4f99c4 BB	323	ret = pwm_adjust_config(drvdata->pwm);
	324	if (ret)
	325	return ret;
8c12ad8e	326
aa66cc66	327	regulator = devm_regulator_register(&pdev->dev,
f907a0a9	328	&drvdata->desc, &config);
aa66cc66	329	if (IS_ERR(regulator)) {
5bf59bd5 LD	330	ret = PTR_ERR(regulator);
	331	dev_err(&pdev->dev, "Failed to register regulator %s: %d\n",
	332	drvdata->desc.name, ret);
	333	return ret;
aa66cc66 CZ	334	}
	335
	336	return 0;
	337	}
	338
	339	static const struct of_device_id pwm_of_match[] = {
	340	{ .compatible = "pwm-regulator" },
	341	{ },
	342	};
	343	MODULE_DEVICE_TABLE(of, pwm_of_match);
	344
	345	static struct platform_driver pwm_regulator_driver = {
	346	.driver = {
	347	.name = "pwm-regulator",
aa66cc66 CZ	348	.of_match_table = of_match_ptr(pwm_of_match),
	349	},
	350	.probe = pwm_regulator_probe,
	351	};
	352
	353	module_platform_driver(pwm_regulator_driver);
	354
	355	MODULE_LICENSE("GPL");
	356	MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>");
	357	MODULE_DESCRIPTION("PWM Regulator Driver");
	358	MODULE_ALIAS("platform:pwm-regulator");