drivers/pwm/pwm-twl.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Driver for TWL4030/6030 Generic Pulse Width Modulator
  *
  * Copyright (C) 2012 Texas Instruments
  * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
  */

 #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 <peter.ujfalusi@ti.com>");
 MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
 MODULE_ALIAS("platform:twl-pwm");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Driver for TWL4030/6030 Generic Pulse Width Modulator
	*
	* Copyright (C) 2012 Texas Instruments
	* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
	*/

	#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 <peter.ujfalusi@ti.com>");
	MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
	MODULE_ALIAS("platform:twl-pwm");
	MODULE_LICENSE("GPL");