[linux.git] / drivers / pwm / pwm-twl-led.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for TWL4030/6030 Pulse Width Modulator used as LED driver
 *
 * Copyright (C) 2012 Texas Instruments
 * Author: Peter Ujfalusi <[email protected]>
 *
 * This driver is a complete rewrite of the former pwm-twl6030.c authorded by:
 * Hemanth V <[email protected]>
 *
 * Reference manual for the twl6030 is available at:
 * https://www.ti.com/lit/ds/symlink/twl6030.pdf
 *
 * Limitations:
 * - The twl6030 hardware only supports two period lengths (128 clock ticks and
 *   64 clock ticks), the driver only uses 128 ticks
 * - The hardware doesn't support ON = 0, so the active part of a period doesn't
 *   start at its beginning.
 * - The hardware could support inverted polarity (with a similar limitation as
 *   for normal: the last clock tick is always inactive).
 * - The hardware emits a constant low output when disabled.
 * - A request for .duty_cycle = 0 results in an output wave with one active
 *   clock tick per period. This should better use the disabled state.
 * - The driver only implements setting the relative duty cycle.
 * - The driver doesn't implement .get_state().
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/mfd/twl.h>
#include <linux/slab.h>

/*
 * This driver handles the PWM driven LED terminals of TWL4030 and TWL6030.
 * To generate the signal on TWL4030:
 *  - LEDA uses PWMA
 *  - LEDB uses PWMB
 * TWL6030 has one LED pin with dedicated LEDPWM
 */

#define TWL4030_LED_MAX		0x7f
#define TWL6030_LED_MAX		0xff

/* Registers, bits and macro for TWL4030 */
#define TWL4030_LEDEN_REG	0x00
#define TWL4030_PWMA_REG	0x01

#define TWL4030_LEDXON		(1 << 0)
#define TWL4030_LEDXPWM		(1 << 4)
#define TWL4030_LED_PINS	(TWL4030_LEDXON | TWL4030_LEDXPWM)
#define TWL4030_LED_TOGGLE(led, x)	((x) << (led))

/* Register, bits and macro for TWL6030 */
#define TWL6030_LED_PWM_CTRL1	0xf4
#define TWL6030_LED_PWM_CTRL2	0xf5

#define TWL6040_LED_MODE_HW	0x00
#define TWL6040_LED_MODE_ON	0x01
#define TWL6040_LED_MODE_OFF	0x02
#define TWL6040_LED_MODE_MASK	0x03

struct twl_pwmled_chip {
	struct pwm_chip chip;
	struct mutex mutex;
};

static inline struct twl_pwmled_chip *to_twl(struct pwm_chip *chip)
{
	return container_of(chip, struct twl_pwmled_chip, chip);
}

static int twl4030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
			      int duty_ns, int period_ns)
{
	int duty_cycle = DIV_ROUND_UP(duty_ns * TWL4030_LED_MAX, period_ns) + 1;
	u8 pwm_config[2] = { 1, 0 };
	int base, ret;

	/*
	 * To configure the duty period:
	 * On-cycle is set to 1 (the minimum allowed value)
	 * The off time of 0 is not configurable, so the mapping is:
	 * 0 -> off cycle = 2,
	 * 1 -> off cycle = 2,
	 * 2 -> off cycle = 3,
	 * 126 - > off cycle 127,
	 * 127 - > off cycle 1
	 * When on cycle == off cycle the PWM will be always on
	 */
	if (duty_cycle == 1)
		duty_cycle = 2;
	else if (duty_cycle > TWL4030_LED_MAX)
		duty_cycle = 1;

	base = pwm->hwpwm * 2 + TWL4030_PWMA_REG;

	pwm_config[1] = duty_cycle;

	ret = twl_i2c_write(TWL4030_MODULE_LED, pwm_config, base, 2);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);

	return ret;
}

static int twl4030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwmled_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label);
		goto out;
	}

	val |= TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);

	ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);

out:
	mutex_unlock(&twl->mutex);
	return ret;
}

static void twl4030_pwmled_disable(struct pwm_chip *chip,
				   struct pwm_device *pwm)
{
	struct twl_pwmled_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label);
		goto out;
	}

	val &= ~TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);

	ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);

out:
	mutex_unlock(&twl->mutex);
}

static int twl4030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,
				const struct pwm_state *state)
{
	int ret;

	if (state->polarity != PWM_POLARITY_NORMAL)
		return -EINVAL;

	if (!state->enabled) {
		if (pwm->state.enabled)
			twl4030_pwmled_disable(chip, pwm);

		return 0;
	}

	/*
	 * We cannot skip calling ->config even if state->period ==
	 * pwm->state.period && state->duty_cycle == pwm->state.duty_cycle
	 * because we might have exited early in the last call to
	 * pwm_apply_state because of !state->enabled and so the two values in
	 * pwm->state might not be configured in hardware.
	 */
	ret = twl4030_pwmled_config(pwm->chip, pwm,
				    state->duty_cycle, state->period);
	if (ret)
		return ret;

	if (!pwm->state.enabled)
		ret = twl4030_pwmled_enable(chip, pwm);

	return ret;
}


static const struct pwm_ops twl4030_pwmled_ops = {
	.apply = twl4030_pwmled_apply,
	.owner = THIS_MODULE,
};

static int twl6030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
			      int duty_ns, int period_ns)
{
	int duty_cycle = (duty_ns * TWL6030_LED_MAX) / period_ns;
	u8 on_time;
	int ret;

	on_time = duty_cycle & 0xff;

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, on_time,
			       TWL6030_LED_PWM_CTRL1);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);

	return ret;
}

static int twl6030_pwmled_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwmled_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
			pwm->label);
		goto out;
	}

	val &= ~TWL6040_LED_MODE_MASK;
	val |= TWL6040_LED_MODE_ON;

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);

out:
	mutex_unlock(&twl->mutex);
	return ret;
}

static void twl6030_pwmled_disable(struct pwm_chip *chip,
				   struct pwm_device *pwm)
{
	struct twl_pwmled_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
			pwm->label);
		goto out;
	}

	val &= ~TWL6040_LED_MODE_MASK;
	val |= TWL6040_LED_MODE_OFF;

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);

out:
	mutex_unlock(&twl->mutex);
}

static int twl6030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,
				const struct pwm_state *state)
{
	int err;

	if (state->polarity != pwm->state.polarity)
		return -EINVAL;

	if (!state->enabled) {
		if (pwm->state.enabled)
			twl6030_pwmled_disable(chip, pwm);

		return 0;
	}

	err = twl6030_pwmled_config(pwm->chip, pwm,
				    state->duty_cycle, state->period);
	if (err)
		return err;

	if (!pwm->state.enabled)
		err = twl6030_pwmled_enable(chip, pwm);

	return err;
}

static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwmled_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
			pwm->label);
		goto out;
	}

	val &= ~TWL6040_LED_MODE_MASK;
	val |= TWL6040_LED_MODE_OFF;

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);

out:
	mutex_unlock(&twl->mutex);
	return ret;
}

static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwmled_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
			pwm->label);
		goto out;
	}

	val &= ~TWL6040_LED_MODE_MASK;
	val |= TWL6040_LED_MODE_HW;

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);

out:
	mutex_unlock(&twl->mutex);
}

static const struct pwm_ops twl6030_pwmled_ops = {
	.apply = twl6030_pwmled_apply,
	.request = twl6030_pwmled_request,
	.free = twl6030_pwmled_free,
	.owner = THIS_MODULE,
};

static int twl_pwmled_probe(struct platform_device *pdev)
{
	struct twl_pwmled_chip *twl;

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

	if (twl_class_is_4030()) {
		twl->chip.ops = &twl4030_pwmled_ops;
		twl->chip.npwm = 2;
	} else {
		twl->chip.ops = &twl6030_pwmled_ops;
		twl->chip.npwm = 1;
	}

	twl->chip.dev = &pdev->dev;

	mutex_init(&twl->mutex);

	return devm_pwmchip_add(&pdev->dev, &twl->chip);
}

#ifdef CONFIG_OF
static const struct of_device_id twl_pwmled_of_match[] = {
	{ .compatible = "ti,twl4030-pwmled" },
	{ .compatible = "ti,twl6030-pwmled" },
	{ },
};
MODULE_DEVICE_TABLE(of, twl_pwmled_of_match);
#endif

static struct platform_driver twl_pwmled_driver = {
	.driver = {
		.name = "twl-pwmled",
		.of_match_table = of_match_ptr(twl_pwmled_of_match),
	},
	.probe = twl_pwmled_probe,
};
module_platform_driver(twl_pwmled_driver);

MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030 LED outputs");
MODULE_ALIAS("platform:twl-pwmled");
MODULE_LICENSE("GPL");
Commit	Line	Data
caab277b	1	// SPDX-License-Identifier: GPL-2.0-only
aa765647 PU	2	/*
	3	* Driver for TWL4030/6030 Pulse Width Modulator used as LED driver
	4	*
	5	* Copyright (C) 2012 Texas Instruments
	6	* Author: Peter Ujfalusi <[email protected]>
	7	*
	8	* This driver is a complete rewrite of the former pwm-twl6030.c authorded by:
	9	* Hemanth V <[email protected]>
ea95b299 UKK	10	*
	11	* Reference manual for the twl6030 is available at:
	12	* https://www.ti.com/lit/ds/symlink/twl6030.pdf
	13	*
	14	* Limitations:
	15	* - The twl6030 hardware only supports two period lengths (128 clock ticks and
	16	* 64 clock ticks), the driver only uses 128 ticks
	17	* - The hardware doesn't support ON = 0, so the active part of a period doesn't
	18	* start at its beginning.
	19	* - The hardware could support inverted polarity (with a similar limitation as
	20	* for normal: the last clock tick is always inactive).
	21	* - The hardware emits a constant low output when disabled.
	22	* - A request for .duty_cycle = 0 results in an output wave with one active
	23	* clock tick per period. This should better use the disabled state.
	24	* - The driver only implements setting the relative duty cycle.
	25	* - The driver doesn't implement .get_state().
aa765647 PU	26	*/
	27
	28	#include <linux/module.h>
e852340d	29	#include <linux/of.h>
aa765647 PU	30	#include <linux/platform_device.h>
aa765647 PU	31	#include <linux/pwm.h>
a2054256	32	#include <linux/mfd/twl.h>
aa765647 PU	33	#include <linux/slab.h>
	34
	35	/*
	36	* This driver handles the PWM driven LED terminals of TWL4030 and TWL6030.
	37	* To generate the signal on TWL4030:
	38	* - LEDA uses PWMA
	39	* - LEDB uses PWMB
	40	* TWL6030 has one LED pin with dedicated LEDPWM
	41	*/
	42
	43	#define TWL4030_LED_MAX 0x7f
	44	#define TWL6030_LED_MAX 0xff
	45
	46	/* Registers, bits and macro for TWL4030 */
	47	#define TWL4030_LEDEN_REG 0x00
	48	#define TWL4030_PWMA_REG 0x01
	49
	50	#define TWL4030_LEDXON (1 << 0)
	51	#define TWL4030_LEDXPWM (1 << 4)
	52	#define TWL4030_LED_PINS (TWL4030_LEDXON \| TWL4030_LEDXPWM)
	53	#define TWL4030_LED_TOGGLE(led, x) ((x) << (led))
	54
	55	/* Register, bits and macro for TWL6030 */
	56	#define TWL6030_LED_PWM_CTRL1 0xf4
	57	#define TWL6030_LED_PWM_CTRL2 0xf5
	58
	59	#define TWL6040_LED_MODE_HW 0x00
	60	#define TWL6040_LED_MODE_ON 0x01
	61	#define TWL6040_LED_MODE_OFF 0x02
	62	#define TWL6040_LED_MODE_MASK 0x03
	63
	64	struct twl_pwmled_chip {
	65	struct pwm_chip chip;
	66	struct mutex mutex;
	67	};
	68
	69	static inline struct twl_pwmled_chip to_twl(struct pwm_chip chip)
	70	{
	71	return container_of(chip, struct twl_pwmled_chip, chip);
	72	}
	73
	74	static int twl4030_pwmled_config(struct pwm_chip chip, struct pwm_device pwm,
	75	int duty_ns, int period_ns)
	76	{
	77	int duty_cycle = DIV_ROUND_UP(duty_ns * TWL4030_LED_MAX, period_ns) + 1;
	78	u8 pwm_config[2] = { 1, 0 };
	79	int base, ret;
	80
	81	/*
	82	* To configure the duty period:
	83	* On-cycle is set to 1 (the minimum allowed value)
	84	* The off time of 0 is not configurable, so the mapping is:
	85	* 0 -> off cycle = 2,
	86	* 1 -> off cycle = 2,
	87	* 2 -> off cycle = 3,
	88	* 126 - > off cycle 127,
	89	* 127 - > off cycle 1
	90	* When on cycle == off cycle the PWM will be always on
	91	*/
	92	if (duty_cycle == 1)
	93	duty_cycle = 2;
	94	else if (duty_cycle > TWL4030_LED_MAX)
	95	duty_cycle = 1;
	96
97	base = pwm->hwpwm * 2 + TWL4030_PWMA_REG;
98
99	pwm_config[1] = duty_cycle;
100
101	ret = twl_i2c_write(TWL4030_MODULE_LED, pwm_config, base, 2);
102	if (ret < 0)
103	dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
104
105	return ret;
106	}
107
108	static int twl4030_pwmled_enable(struct pwm_chip chip, struct pwm_device pwm)
109	{
110	struct twl_pwmled_chip *twl = to_twl(chip);
111	int ret;
112	u8 val;
113
114	mutex_lock(&twl->mutex);
115	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
116	if (ret < 0) {
117	dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label);
118	goto out;
119	}
120
121	val \|= TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);
122
123	ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG);
124	if (ret < 0)
125	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
126
127	out:
128	mutex_unlock(&twl->mutex);
129	return ret;
130	}
131
132	static void twl4030_pwmled_disable(struct pwm_chip *chip,
133	struct pwm_device *pwm)
134	{
135	struct twl_pwmled_chip *twl = to_twl(chip);
136	int ret;
137	u8 val;
138
139	mutex_lock(&twl->mutex);
140	ret = twl_i2c_read_u8(TWL4030_MODULE_LED, &val, TWL4030_LEDEN_REG);
141	if (ret < 0) {
142	dev_err(chip->dev, "%s: Failed to read LEDEN\n", pwm->label);
143	goto out;
144	}
145
146	val &= ~TWL4030_LED_TOGGLE(pwm->hwpwm, TWL4030_LED_PINS);
147
148	ret = twl_i2c_write_u8(TWL4030_MODULE_LED, val, TWL4030_LEDEN_REG);
149	if (ret < 0)
150	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
151
152	out:
153	mutex_unlock(&twl->mutex);
154	}
155
a1bbf823 UKK	156	static int twl4030_pwmled_apply(struct pwm_chip chip, struct pwm_device pwm,
	157	const struct pwm_state *state)
	158	{
	159	int ret;
	160
	161	if (state->polarity != PWM_POLARITY_NORMAL)
	162	return -EINVAL;
	163
	164	if (!state->enabled) {
	165	if (pwm->state.enabled)
	166	twl4030_pwmled_disable(chip, pwm);
	167
	168	return 0;
	169	}
	170
	171	/*
	172	* We cannot skip calling ->config even if state->period ==
	173	* pwm->state.period && state->duty_cycle == pwm->state.duty_cycle
	174	* because we might have exited early in the last call to
	175	* pwm_apply_state because of !state->enabled and so the two values in
	176	* pwm->state might not be configured in hardware.
	177	*/
	178	ret = twl4030_pwmled_config(pwm->chip, pwm,
	179	state->duty_cycle, state->period);
	180	if (ret)
	181	return ret;
	182
	183	if (!pwm->state.enabled)
	184	ret = twl4030_pwmled_enable(chip, pwm);
	185
	186	return ret;
	187	}
	188
	189
	190	static const struct pwm_ops twl4030_pwmled_ops = {
	191	.apply = twl4030_pwmled_apply,
	192	.owner = THIS_MODULE,
	193	};
	194
aa765647 PU	195	static int twl6030_pwmled_config(struct pwm_chip chip, struct pwm_device pwm,
	196	int duty_ns, int period_ns)
	197	{
	198	int duty_cycle = (duty_ns * TWL6030_LED_MAX) / period_ns;
	199	u8 on_time;
	200	int ret;
	201
	202	on_time = duty_cycle & 0xff;
	203
	204	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, on_time,
	205	TWL6030_LED_PWM_CTRL1);
	206	if (ret < 0)
	207	dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
	208
	209	return ret;
	210	}
	211
	212	static int twl6030_pwmled_enable(struct pwm_chip chip, struct pwm_device pwm)
	213	{
	214	struct twl_pwmled_chip *twl = to_twl(chip);
	215	int ret;
	216	u8 val;
	217
	218	mutex_lock(&twl->mutex);
	219	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	220	if (ret < 0) {
	221	dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
	222	pwm->label);
	223	goto out;
	224	}
	225
	226	val &= ~TWL6040_LED_MODE_MASK;
	227	val \|= TWL6040_LED_MODE_ON;
	228
	229	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	230	if (ret < 0)
	231	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
	232
	233	out:
	234	mutex_unlock(&twl->mutex);
	235	return ret;
	236	}
	237
	238	static void twl6030_pwmled_disable(struct pwm_chip *chip,
	239	struct pwm_device *pwm)
	240	{
	241	struct twl_pwmled_chip *twl = to_twl(chip);
	242	int ret;
	243	u8 val;
	244
	245	mutex_lock(&twl->mutex);
	246	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	247	if (ret < 0) {
	248	dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
	249	pwm->label);
	250	goto out;
	251	}
	252
	253	val &= ~TWL6040_LED_MODE_MASK;
	254	val \|= TWL6040_LED_MODE_OFF;
	255
	256	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	257	if (ret < 0)
	258	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
259
260	out:
261	mutex_unlock(&twl->mutex);
262	}
263
a1bbf823 UKK	264	static int twl6030_pwmled_apply(struct pwm_chip chip, struct pwm_device pwm,
	265	const struct pwm_state *state)
	266	{
	267	int err;
	268
	269	if (state->polarity != pwm->state.polarity)
	270	return -EINVAL;
	271
	272	if (!state->enabled) {
	273	if (pwm->state.enabled)
	274	twl6030_pwmled_disable(chip, pwm);
	275
	276	return 0;
	277	}
	278
	279	err = twl6030_pwmled_config(pwm->chip, pwm,
	280	state->duty_cycle, state->period);
	281	if (err)
	282	return err;
	283
	284	if (!pwm->state.enabled)
	285	err = twl6030_pwmled_enable(chip, pwm);
	286
	287	return err;
	288	}
	289
aa765647 PU	290	static int twl6030_pwmled_request(struct pwm_chip chip, struct pwm_device pwm)
	291	{
	292	struct twl_pwmled_chip *twl = to_twl(chip);
	293	int ret;
	294	u8 val;
	295
	296	mutex_lock(&twl->mutex);
	297	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	298	if (ret < 0) {
	299	dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
	300	pwm->label);
	301	goto out;
	302	}
	303
	304	val &= ~TWL6040_LED_MODE_MASK;
	305	val \|= TWL6040_LED_MODE_OFF;
	306
	307	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	308	if (ret < 0)
	309	dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
	310
	311	out:
	312	mutex_unlock(&twl->mutex);
	313	return ret;
	314	}
	315
	316	static void twl6030_pwmled_free(struct pwm_chip chip, struct pwm_device pwm)
	317	{
	318	struct twl_pwmled_chip *twl = to_twl(chip);
	319	int ret;
	320	u8 val;
	321
	322	mutex_lock(&twl->mutex);
	323	ret = twl_i2c_read_u8(TWL6030_MODULE_ID1, &val, TWL6030_LED_PWM_CTRL2);
	324	if (ret < 0) {
	325	dev_err(chip->dev, "%s: Failed to read PWM_CTRL2\n",
	326	pwm->label);
	327	goto out;
	328	}
	329
	330	val &= ~TWL6040_LED_MODE_MASK;
	331	val \|= TWL6040_LED_MODE_HW;
	332
	333	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_LED_PWM_CTRL2);
	334	if (ret < 0)
	335	dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
	336
	337	out:
	338	mutex_unlock(&twl->mutex);
	339	}
	340
aa765647	341	static const struct pwm_ops twl6030_pwmled_ops = {
a1bbf823	342	.apply = twl6030_pwmled_apply,
aa765647 PU	343	.request = twl6030_pwmled_request,
aa765647 PU	344	.free = twl6030_pwmled_free,
7fa25314	345	.owner = THIS_MODULE,
aa765647 PU	346	};
	347
	348	static int twl_pwmled_probe(struct platform_device *pdev)
	349	{
	350	struct twl_pwmled_chip *twl;
aa765647 PU	351
	352	twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
	353	if (!twl)
	354	return -ENOMEM;
	355
	356	if (twl_class_is_4030()) {
	357	twl->chip.ops = &twl4030_pwmled_ops;
	358	twl->chip.npwm = 2;
	359	} else {
	360	twl->chip.ops = &twl6030_pwmled_ops;
	361	twl->chip.npwm = 1;
	362	}
	363
	364	twl->chip.dev = &pdev->dev;
aa765647 PU	365
	366	mutex_init(&twl->mutex);
	367
c9bb1c9e	368	return devm_pwmchip_add(&pdev->dev, &twl->chip);
aa765647 PU	369	}
	370
	371	#ifdef CONFIG_OF
f1a8870a	372	static const struct of_device_id twl_pwmled_of_match[] = {
aa765647 PU	373	{ .compatible = "ti,twl4030-pwmled" },
	374	{ .compatible = "ti,twl6030-pwmled" },
	375	{ },
	376	};
	377	MODULE_DEVICE_TABLE(of, twl_pwmled_of_match);
	378	#endif
	379
	380	static struct platform_driver twl_pwmled_driver = {
	381	.driver = {
	382	.name = "twl-pwmled",
	383	.of_match_table = of_match_ptr(twl_pwmled_of_match),
	384	},
	385	.probe = twl_pwmled_probe,
aa765647 PU	386	};
	387	module_platform_driver(twl_pwmled_driver);
	388
	389	MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
	390	MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030 LED outputs");
	391	MODULE_ALIAS("platform:twl-pwmled");
	392	MODULE_LICENSE("GPL");