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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for TWL4030/6030 Generic Pulse Width Modulator
 *
 * Copyright (C) 2012 Texas Instruments
 * Author: Peter Ujfalusi <[email protected]>
 */

#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 PWMs of TWL4030 and TWL6030.
 * The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
 * TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
 */

#define TWL_PWM_MAX		0x7f

/* Registers, bits and macro for TWL4030 */
#define TWL4030_GPBR1_REG	0x0c
#define TWL4030_PMBR1_REG	0x0d

/* GPBR1 register bits */
#define TWL4030_PWMXCLK_ENABLE	(1 << 0)
#define TWL4030_PWMX_ENABLE	(1 << 2)
#define TWL4030_PWMX_BITS	(TWL4030_PWMX_ENABLE | TWL4030_PWMXCLK_ENABLE)
#define TWL4030_PWM_TOGGLE(pwm, x)	((x) << (pwm))

/* PMBR1 register bits */
#define TWL4030_GPIO6_PWM0_MUTE_MASK		(0x03 << 2)
#define TWL4030_GPIO6_PWM0_MUTE_PWM0		(0x01 << 2)
#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK	(0x03 << 4)
#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1	(0x03 << 4)

/* Register, bits and macro for TWL6030 */
#define TWL6030_TOGGLE3_REG	0x92

#define TWL6030_PWMXR		(1 << 0)
#define TWL6030_PWMXS		(1 << 1)
#define TWL6030_PWMXEN		(1 << 2)
#define TWL6030_PWM_TOGGLE(pwm, x)	((x) << (pwm * 3))

struct twl_pwm_chip {
	struct pwm_chip chip;
	struct mutex mutex;
	u8 twl6030_toggle3;
	u8 twl4030_pwm_mux;
};

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

static int twl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
			  u64 duty_ns, u64 period_ns)
{
	int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_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 > TWL_PWM_MAX)
		duty_cycle = 1;

	base = pwm->hwpwm * 3;

	pwm_config[1] = duty_cycle;

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

	return ret;
}

static int twl4030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwm_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
		goto out;
	}

	val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);

	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);

	val |= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);

	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_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_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwm_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
		goto out;
	}

	val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);

	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);

	val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);

	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);

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

static int twl4030_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwm_chip *twl = to_twl(chip);
	int ret;
	u8 val, mask, bits;

	if (pwm->hwpwm == 1) {
		mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
		bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
	} else {
		mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
		bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
	}

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
		goto out;
	}

	/* Save the current MUX configuration for the PWM */
	twl->twl4030_pwm_mux &= ~mask;
	twl->twl4030_pwm_mux |= (val & mask);

	/* Select PWM functionality */
	val &= ~mask;
	val |= bits;

	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);

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

static void twl4030_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwm_chip *twl = to_twl(chip);
	int ret;
	u8 val, mask;

	if (pwm->hwpwm == 1)
		mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
	else
		mask = TWL4030_GPIO6_PWM0_MUTE_MASK;

	mutex_lock(&twl->mutex);
	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
		goto out;
	}

	/* Restore the MUX configuration for the PWM */
	val &= ~mask;
	val |= (twl->twl4030_pwm_mux & mask);

	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);

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

static int twl6030_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwm_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	val = twl->twl6030_toggle3;
	val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);
	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
		goto out;
	}

	twl->twl6030_toggle3 = val;
out:
	mutex_unlock(&twl->mutex);
	return ret;
}

static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwm_chip *twl = to_twl(chip);
	int ret;
	u8 val;

	mutex_lock(&twl->mutex);
	val = twl->twl6030_toggle3;
	val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS | TWL6030_PWMXEN);

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
		goto out;
	}

	val |= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
		goto out;
	}

	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);

	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	if (ret < 0) {
		dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
		goto out;
	}

	twl->twl6030_toggle3 = val;
out:
	mutex_unlock(&twl->mutex);
}

static int twl4030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			     const struct pwm_state *state)
{
	int err;

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

	if (!state->enabled) {
		if (pwm->state.enabled)
			twl4030_pwm_disable(chip, pwm);

		return 0;
	}

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

	if (!pwm->state.enabled)
		err = twl4030_pwm_enable(chip, pwm);

	return err;
}

static int twl6030_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			     const struct pwm_state *state)
{
	int err;

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

	if (!state->enabled) {
		if (pwm->state.enabled)
			twl6030_pwm_disable(chip, pwm);

		return 0;
	}

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

	if (!pwm->state.enabled)
		err = twl6030_pwm_enable(chip, pwm);

	return err;
}

static const struct pwm_ops twl4030_pwm_ops = {
	.apply = twl4030_pwm_apply,
	.request = twl4030_pwm_request,
	.free = twl4030_pwm_free,
	.owner = THIS_MODULE,
};

static const struct pwm_ops twl6030_pwm_ops = {
	.apply = twl6030_pwm_apply,
	.owner = THIS_MODULE,
};

static int twl_pwm_probe(struct platform_device *pdev)
{
	struct twl_pwm_chip *twl;

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

	if (twl_class_is_4030())
		twl->chip.ops = &twl4030_pwm_ops;
	else
		twl->chip.ops = &twl6030_pwm_ops;

	twl->chip.dev = &pdev->dev;
	twl->chip.npwm = 2;

	mutex_init(&twl->mutex);

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

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

static struct platform_driver twl_pwm_driver = {
	.driver = {
		.name = "twl-pwm",
		.of_match_table = of_match_ptr(twl_pwm_of_match),
	},
	.probe = twl_pwm_probe,
};
module_platform_driver(twl_pwm_driver);

MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
MODULE_ALIAS("platform:twl-pwm");
MODULE_LICENSE("GPL");
Commit	Line	Data
caab277b	1	// SPDX-License-Identifier: GPL-2.0-only
3744c263 PU	2	/*
	3	* Driver for TWL4030/6030 Generic Pulse Width Modulator
	4	*
	5	* Copyright (C) 2012 Texas Instruments
	6	* Author: Peter Ujfalusi <[email protected]>
3744c263 PU	7	*/
	8
	9	#include <linux/module.h>
ea8eeb15	10	#include <linux/of.h>
3744c263 PU	11	#include <linux/platform_device.h>
3744c263 PU	12	#include <linux/pwm.h>
a2054256	13	#include <linux/mfd/twl.h>
3744c263 PU	14	#include <linux/slab.h>
	15
	16	/*
	17	* This driver handles the PWMs of TWL4030 and TWL6030.
	18	* The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
	19	* TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
	20	*/
	21
	22	#define TWL_PWM_MAX 0x7f
	23
	24	/* Registers, bits and macro for TWL4030 */
	25	#define TWL4030_GPBR1_REG 0x0c
	26	#define TWL4030_PMBR1_REG 0x0d
	27
	28	/* GPBR1 register bits */
	29	#define TWL4030_PWMXCLK_ENABLE (1 << 0)
	30	#define TWL4030_PWMX_ENABLE (1 << 2)
	31	#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE \| TWL4030_PWMXCLK_ENABLE)
	32	#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
	33
	34	/* PMBR1 register bits */
	35	#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
	36	#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
	37	#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
	38	#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
	39
	40	/* Register, bits and macro for TWL6030 */
	41	#define TWL6030_TOGGLE3_REG 0x92
	42
	43	#define TWL6030_PWMXR (1 << 0)
	44	#define TWL6030_PWMXS (1 << 1)
	45	#define TWL6030_PWMXEN (1 << 2)
	46	#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
	47
	48	struct twl_pwm_chip {
	49	struct pwm_chip chip;
	50	struct mutex mutex;
	51	u8 twl6030_toggle3;
	52	u8 twl4030_pwm_mux;
	53	};
	54
	55	static inline struct twl_pwm_chip to_twl(struct pwm_chip chip)
	56	{
	57	return container_of(chip, struct twl_pwm_chip, chip);
	58	}
	59
	60	static int twl_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
5e93d778	61	u64 duty_ns, u64 period_ns)
3744c263	62	{
5e93d778	63	int duty_cycle = DIV64_U64_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
3744c263 PU	64	u8 pwm_config[2] = { 1, 0 };
	65	int base, ret;
	66
	67	/*
	68	* To configure the duty period:
	69	* On-cycle is set to 1 (the minimum allowed value)
	70	* The off time of 0 is not configurable, so the mapping is:
	71	* 0 -> off cycle = 2,
	72	* 1 -> off cycle = 2,
	73	* 2 -> off cycle = 3,
	74	* 126 - > off cycle 127,
	75	* 127 - > off cycle 1
	76	* When on cycle == off cycle the PWM will be always on
	77	*/
	78	if (duty_cycle == 1)
	79	duty_cycle = 2;
	80	else if (duty_cycle > TWL_PWM_MAX)
	81	duty_cycle = 1;
	82
	83	base = pwm->hwpwm * 3;
	84
	85	pwm_config[1] = duty_cycle;
	86
	87	ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
	88	if (ret < 0)
	89	dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
	90
	91	return ret;
	92	}
	93
	94	static int twl4030_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
	95	{
	96	struct twl_pwm_chip *twl = to_twl(chip);
	97	int ret;
	98	u8 val;
	99
	100	mutex_lock(&twl->mutex);
	101	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
	102	if (ret < 0) {
	103	dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
	104	goto out;
	105	}
	106
	107	val \|= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
	108
	109	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
	110	if (ret < 0)
	111	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
	112
	113	val \|= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
	114
	115	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
	116	if (ret < 0)
	117	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
	118
	119	out:
	120	mutex_unlock(&twl->mutex);
	121	return ret;
	122	}
	123
	124	static void twl4030_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
	125	{
	126	struct twl_pwm_chip *twl = to_twl(chip);
	127	int ret;
128	u8 val;
129
130	mutex_lock(&twl->mutex);
131	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
132	if (ret < 0) {
133	dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
134	goto out;
135	}
136
137	val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
138
139	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
140	if (ret < 0)
141	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
142
143	val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
144
145	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
146	if (ret < 0)
147	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
148
149	out:
150	mutex_unlock(&twl->mutex);
151	}
152
153	static int twl4030_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
154	{
155	struct twl_pwm_chip *twl = to_twl(chip);
156	int ret;
157	u8 val, mask, bits;
158
159	if (pwm->hwpwm == 1) {
160	mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
161	bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
162	} else {
163	mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
164	bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
165	}
166
167	mutex_lock(&twl->mutex);
168	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
169	if (ret < 0) {
170	dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
171	goto out;
172	}
173
174	/* Save the current MUX configuration for the PWM */
175	twl->twl4030_pwm_mux &= ~mask;
176	twl->twl4030_pwm_mux \|= (val & mask);
177
178	/* Select PWM functionality */
179	val &= ~mask;
180	val \|= bits;
181
182	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
183	if (ret < 0)
184	dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
185
186	out:
187	mutex_unlock(&twl->mutex);
188	return ret;
189	}
190
191	static void twl4030_pwm_free(struct pwm_chip chip, struct pwm_device pwm)
192	{
30f78617	193	struct twl_pwm_chip *twl = to_twl(chip);
3744c263 PU	194	int ret;
	195	u8 val, mask;
	196
	197	if (pwm->hwpwm == 1)
	198	mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
	199	else
	200	mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
	201
	202	mutex_lock(&twl->mutex);
	203	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
	204	if (ret < 0) {
	205	dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
	206	goto out;
	207	}
	208
	209	/* Restore the MUX configuration for the PWM */
	210	val &= ~mask;
	211	val \|= (twl->twl4030_pwm_mux & mask);
	212
	213	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
	214	if (ret < 0)
	215	dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
	216
	217	out:
	218	mutex_unlock(&twl->mutex);
	219	}
	220
	221	static int twl6030_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
	222	{
30f78617	223	struct twl_pwm_chip *twl = to_twl(chip);
3744c263 PU	224	int ret;
	225	u8 val;
	226
	227	mutex_lock(&twl->mutex);
	228	val = twl->twl6030_toggle3;
	229	val \|= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS \| TWL6030_PWMXEN);
	230	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
	231
	232	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	233	if (ret < 0) {
	234	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
	235	goto out;
	236	}
	237
	238	twl->twl6030_toggle3 = val;
	239	out:
	240	mutex_unlock(&twl->mutex);
c8e4df31	241	return ret;
3744c263 PU	242	}
	243
	244	static void twl6030_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
	245	{
30f78617	246	struct twl_pwm_chip *twl = to_twl(chip);
3744c263 PU	247	int ret;
	248	u8 val;
	249
	250	mutex_lock(&twl->mutex);
	251	val = twl->twl6030_toggle3;
	252	val \|= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
	253	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS \| TWL6030_PWMXEN);
	254
3744c263 PU	255	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	256	if (ret < 0) {
	257	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
	258	goto out;
	259	}
	260
45c0ce84 PK	261	val \|= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
	262
	263	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	264	if (ret < 0) {
	265	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
	266	goto out;
	267	}
	268
	269	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXEN);
	270
	271	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
	272	if (ret < 0) {
	273	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
	274	goto out;
	275	}
	276
3744c263 PU	277	twl->twl6030_toggle3 = val;
	278	out:
	279	mutex_unlock(&twl->mutex);
	280	}
	281
5e93d778 UKK	282	static int twl4030_pwm_apply(struct pwm_chip chip, struct pwm_device pwm,
	283	const struct pwm_state *state)
	284	{
	285	int err;
	286
	287	if (state->polarity != PWM_POLARITY_NORMAL)
	288	return -EINVAL;
	289
	290	if (!state->enabled) {
	291	if (pwm->state.enabled)
	292	twl4030_pwm_disable(chip, pwm);
	293
	294	return 0;
	295	}
	296
	297	err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
	298	if (err)
	299	return err;
	300
	301	if (!pwm->state.enabled)
	302	err = twl4030_pwm_enable(chip, pwm);
	303
	304	return err;
	305	}
	306
	307	static int twl6030_pwm_apply(struct pwm_chip chip, struct pwm_device pwm,
	308	const struct pwm_state *state)
	309	{
	310	int err;
	311
	312	if (state->polarity != PWM_POLARITY_NORMAL)
	313	return -EINVAL;
	314
	315	if (!state->enabled) {
	316	if (pwm->state.enabled)
	317	twl6030_pwm_disable(chip, pwm);
	318
	319	return 0;
	320	}
	321
	322	err = twl_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
	323	if (err)
	324	return err;
	325
	326	if (!pwm->state.enabled)
	327	err = twl6030_pwm_enable(chip, pwm);
	328
	329	return err;
	330	}
	331
3744c263	332	static const struct pwm_ops twl4030_pwm_ops = {
5e93d778	333	.apply = twl4030_pwm_apply,
3744c263 PU	334	.request = twl4030_pwm_request,
3744c263 PU	335	.free = twl4030_pwm_free,
d5714e8b	336	.owner = THIS_MODULE,
3744c263 PU	337	};
	338
	339	static const struct pwm_ops twl6030_pwm_ops = {
5e93d778	340	.apply = twl6030_pwm_apply,
d5714e8b	341	.owner = THIS_MODULE,
3744c263 PU	342	};
	343
	344	static int twl_pwm_probe(struct platform_device *pdev)
	345	{
	346	struct twl_pwm_chip *twl;
3744c263 PU	347
	348	twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
	349	if (!twl)
	350	return -ENOMEM;
	351
	352	if (twl_class_is_4030())
	353	twl->chip.ops = &twl4030_pwm_ops;
	354	else
	355	twl->chip.ops = &twl6030_pwm_ops;
	356
	357	twl->chip.dev = &pdev->dev;
3744c263 PU	358	twl->chip.npwm = 2;
	359
	360	mutex_init(&twl->mutex);
	361
a75bc6b7	362	return devm_pwmchip_add(&pdev->dev, &twl->chip);
3744c263 PU	363	}
	364
	365	#ifdef CONFIG_OF
f1a8870a	366	static const struct of_device_id twl_pwm_of_match[] = {
3744c263 PU	367	{ .compatible = "ti,twl4030-pwm" },
	368	{ .compatible = "ti,twl6030-pwm" },
	369	{ },
	370	};
	371	MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
	372	#endif
	373
	374	static struct platform_driver twl_pwm_driver = {
	375	.driver = {
	376	.name = "twl-pwm",
	377	.of_match_table = of_match_ptr(twl_pwm_of_match),
	378	},
	379	.probe = twl_pwm_probe,
3744c263 PU	380	};
	381	module_platform_driver(twl_pwm_driver);
	382
	383	MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
	384	MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
	385	MODULE_ALIAS("platform:twl-pwm");
	386	MODULE_LICENSE("GPL");