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

/*
 * Driver for TWL4030/6030 Generic Pulse Width Modulator
 *
 * Copyright (C) 2012 Texas Instruments
 * Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/i2c/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,
			      int duty_ns, int period_ns)
{
	int duty_cycle = DIV_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 = container_of(chip, struct twl_pwm_chip,
						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 = container_of(chip, struct twl_pwm_chip,
						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 0;
}

static void twl6030_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip,
						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 read TOGGLE3\n", pwm->label);
		goto out;
	}

	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;
	}

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

static const struct pwm_ops twl4030_pwm_ops = {
	.config = twl_pwm_config,
	.enable = twl4030_pwm_enable,
	.disable = twl4030_pwm_disable,
	.request = twl4030_pwm_request,
	.free = twl4030_pwm_free,
};

static const struct pwm_ops twl6030_pwm_ops = {
	.config = twl_pwm_config,
	.enable = twl6030_pwm_enable,
	.disable = twl6030_pwm_disable,
};

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

	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.base = -1;
	twl->chip.npwm = 2;
	twl->chip.can_sleep = true;

	mutex_init(&twl->mutex);

	ret = pwmchip_add(&twl->chip);
	if (ret < 0)
		return ret;

	platform_set_drvdata(pdev, twl);

	return 0;
}

static int twl_pwm_remove(struct platform_device *pdev)
{
	struct twl_pwm_chip *twl = platform_get_drvdata(pdev);

	return pwmchip_remove(&twl->chip);
}

#ifdef CONFIG_OF
static 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,
	.remove = twl_pwm_remove,
};
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");
Commit	Line	Data
3744c263 PU	1	/*
	2	* Driver for TWL4030/6030 Generic Pulse Width Modulator
	3	*
	4	* Copyright (C) 2012 Texas Instruments
	5	* Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License version 2 as published by
	9	* the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	14	* more details.
	15	*
	16	* You should have received a copy of the GNU General Public License along with
	17	* this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/module.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/pwm.h>
	23	#include <linux/i2c/twl.h>
	24	#include <linux/slab.h>
	25
	26	/*
	27	* This driver handles the PWMs of TWL4030 and TWL6030.
	28	* The TRM names for the PWMs on TWL4030 are: PWM0, PWM1
	29	* TWL6030 also have two PWMs named in the TRM as PWM1, PWM2
	30	*/
	31
	32	#define TWL_PWM_MAX 0x7f
	33
	34	/* Registers, bits and macro for TWL4030 */
	35	#define TWL4030_GPBR1_REG 0x0c
	36	#define TWL4030_PMBR1_REG 0x0d
	37
	38	/* GPBR1 register bits */
	39	#define TWL4030_PWMXCLK_ENABLE (1 << 0)
	40	#define TWL4030_PWMX_ENABLE (1 << 2)
	41	#define TWL4030_PWMX_BITS (TWL4030_PWMX_ENABLE \| TWL4030_PWMXCLK_ENABLE)
	42	#define TWL4030_PWM_TOGGLE(pwm, x) ((x) << (pwm))
	43
	44	/* PMBR1 register bits */
	45	#define TWL4030_GPIO6_PWM0_MUTE_MASK (0x03 << 2)
	46	#define TWL4030_GPIO6_PWM0_MUTE_PWM0 (0x01 << 2)
	47	#define TWL4030_GPIO7_VIBRASYNC_PWM1_MASK (0x03 << 4)
	48	#define TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1 (0x03 << 4)
	49
	50	/* Register, bits and macro for TWL6030 */
	51	#define TWL6030_TOGGLE3_REG 0x92
	52
	53	#define TWL6030_PWMXR (1 << 0)
	54	#define TWL6030_PWMXS (1 << 1)
	55	#define TWL6030_PWMXEN (1 << 2)
	56	#define TWL6030_PWM_TOGGLE(pwm, x) ((x) << (pwm * 3))
	57
	58	struct twl_pwm_chip {
	59	struct pwm_chip chip;
	60	struct mutex mutex;
	61	u8 twl6030_toggle3;
	62	u8 twl4030_pwm_mux;
	63	};
	64
65	static inline struct twl_pwm_chip to_twl(struct pwm_chip chip)
66	{
67	return container_of(chip, struct twl_pwm_chip, chip);
68	}
69
70	static int twl_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
71	int duty_ns, int period_ns)
72	{
73	int duty_cycle = DIV_ROUND_UP(duty_ns * TWL_PWM_MAX, period_ns) + 1;
74	u8 pwm_config[2] = { 1, 0 };
75	int base, ret;
76
77	/*
78	* To configure the duty period:
79	* On-cycle is set to 1 (the minimum allowed value)
80	* The off time of 0 is not configurable, so the mapping is:
81	* 0 -> off cycle = 2,
82	* 1 -> off cycle = 2,
83	* 2 -> off cycle = 3,
84	* 126 - > off cycle 127,
85	* 127 - > off cycle 1
86	* When on cycle == off cycle the PWM will be always on
87	*/
88	if (duty_cycle == 1)
89	duty_cycle = 2;
90	else if (duty_cycle > TWL_PWM_MAX)
91	duty_cycle = 1;
92
93	base = pwm->hwpwm * 3;
94
95	pwm_config[1] = duty_cycle;
96
97	ret = twl_i2c_write(TWL_MODULE_PWM, pwm_config, base, 2);
98	if (ret < 0)
99	dev_err(chip->dev, "%s: Failed to configure PWM\n", pwm->label);
100
101	return ret;
102	}
103
104	static int twl4030_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
105	{
106	struct twl_pwm_chip *twl = to_twl(chip);
107	int ret;
108	u8 val;
109
110	mutex_lock(&twl->mutex);
111	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
112	if (ret < 0) {
113	dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
114	goto out;
115	}
116
117	val \|= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
118
119	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
120	if (ret < 0)
121	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
122
123	val \|= TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
124
125	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
126	if (ret < 0)
127	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
128
129	out:
130	mutex_unlock(&twl->mutex);
131	return ret;
132	}
133
134	static void twl4030_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
135	{
136	struct twl_pwm_chip *twl = to_twl(chip);
137	int ret;
138	u8 val;
139
140	mutex_lock(&twl->mutex);
141	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_GPBR1_REG);
142	if (ret < 0) {
143	dev_err(chip->dev, "%s: Failed to read GPBR1\n", pwm->label);
144	goto out;
145	}
146
147	val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMX_ENABLE);
148
149	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
150	if (ret < 0)
151	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
152
153	val &= ~TWL4030_PWM_TOGGLE(pwm->hwpwm, TWL4030_PWMXCLK_ENABLE);
154
155	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_GPBR1_REG);
156	if (ret < 0)
157	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
158
159	out:
160	mutex_unlock(&twl->mutex);
161	}
162
163	static int twl4030_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
164	{
165	struct twl_pwm_chip *twl = to_twl(chip);
166	int ret;
167	u8 val, mask, bits;
168
169	if (pwm->hwpwm == 1) {
170	mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
171	bits = TWL4030_GPIO7_VIBRASYNC_PWM1_PWM1;
172	} else {
173	mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
174	bits = TWL4030_GPIO6_PWM0_MUTE_PWM0;
175	}
176
177	mutex_lock(&twl->mutex);
178	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
179	if (ret < 0) {
180	dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
181	goto out;
182	}
183
184	/* Save the current MUX configuration for the PWM */
185	twl->twl4030_pwm_mux &= ~mask;
186	twl->twl4030_pwm_mux \|= (val & mask);
187
188	/* Select PWM functionality */
189	val &= ~mask;
190	val \|= bits;
191
192	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
193	if (ret < 0)
194	dev_err(chip->dev, "%s: Failed to request PWM\n", pwm->label);
195
196	out:
197	mutex_unlock(&twl->mutex);
198	return ret;
199	}
200
201	static void twl4030_pwm_free(struct pwm_chip chip, struct pwm_device pwm)
202	{
203	struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip,
204	chip);
205	int ret;
206	u8 val, mask;
207
208	if (pwm->hwpwm == 1)
209	mask = TWL4030_GPIO7_VIBRASYNC_PWM1_MASK;
210	else
211	mask = TWL4030_GPIO6_PWM0_MUTE_MASK;
212
213	mutex_lock(&twl->mutex);
214	ret = twl_i2c_read_u8(TWL4030_MODULE_INTBR, &val, TWL4030_PMBR1_REG);
215	if (ret < 0) {
216	dev_err(chip->dev, "%s: Failed to read PMBR1\n", pwm->label);
217	goto out;
218	}
219
220	/* Restore the MUX configuration for the PWM */
221	val &= ~mask;
222	val \|= (twl->twl4030_pwm_mux & mask);
223
224	ret = twl_i2c_write_u8(TWL4030_MODULE_INTBR, val, TWL4030_PMBR1_REG);
225	if (ret < 0)
226	dev_err(chip->dev, "%s: Failed to free PWM\n", pwm->label);
227
228	out:
229	mutex_unlock(&twl->mutex);
230	}
231
232	static int twl6030_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
233	{
234	struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip,
235	chip);
236	int ret;
237	u8 val;
238
239	mutex_lock(&twl->mutex);
240	val = twl->twl6030_toggle3;
241	val \|= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS \| TWL6030_PWMXEN);
242	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
243
244	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
245	if (ret < 0) {
246	dev_err(chip->dev, "%s: Failed to enable PWM\n", pwm->label);
247	goto out;
248	}
249
250	twl->twl6030_toggle3 = val;
251	out:
252	mutex_unlock(&twl->mutex);
253	return 0;
254	}
255
256	static void twl6030_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
257	{
258	struct twl_pwm_chip *twl = container_of(chip, struct twl_pwm_chip,
259	chip);
260	int ret;
261	u8 val;
262
263	mutex_lock(&twl->mutex);
264	val = twl->twl6030_toggle3;
265	val \|= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXR);
266	val &= ~TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS \| TWL6030_PWMXEN);
267
268	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
269	if (ret < 0) {
270	dev_err(chip->dev, "%s: Failed to read TOGGLE3\n", pwm->label);
271	goto out;
272	}
273
274	val \|= TWL6030_PWM_TOGGLE(pwm->hwpwm, TWL6030_PWMXS \| TWL6030_PWMXEN);
275
276	ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, val, TWL6030_TOGGLE3_REG);
277	if (ret < 0) {
278	dev_err(chip->dev, "%s: Failed to disable PWM\n", pwm->label);
279	goto out;
280	}
281
282	twl->twl6030_toggle3 = val;
283	out:
284	mutex_unlock(&twl->mutex);
285	}
286
287	static const struct pwm_ops twl4030_pwm_ops = {
288	.config = twl_pwm_config,
289	.enable = twl4030_pwm_enable,
290	.disable = twl4030_pwm_disable,
291	.request = twl4030_pwm_request,
292	.free = twl4030_pwm_free,
293	};
294
295	static const struct pwm_ops twl6030_pwm_ops = {
296	.config = twl_pwm_config,
297	.enable = twl6030_pwm_enable,
298	.disable = twl6030_pwm_disable,
299	};
300
301	static int twl_pwm_probe(struct platform_device *pdev)
302	{
303	struct twl_pwm_chip *twl;
304	int ret;
305
306	twl = devm_kzalloc(&pdev->dev, sizeof(*twl), GFP_KERNEL);
307	if (!twl)
308	return -ENOMEM;
309
310	if (twl_class_is_4030())
311	twl->chip.ops = &twl4030_pwm_ops;
312	else
313	twl->chip.ops = &twl6030_pwm_ops;
314
315	twl->chip.dev = &pdev->dev;
316	twl->chip.base = -1;
317	twl->chip.npwm = 2;
2e2a0f6e	318	twl->chip.can_sleep = true;
3744c263 PU	319
	320	mutex_init(&twl->mutex);
	321
	322	ret = pwmchip_add(&twl->chip);
	323	if (ret < 0)
	324	return ret;
	325
	326	platform_set_drvdata(pdev, twl);
	327
	328	return 0;
	329	}
	330
	331	static int twl_pwm_remove(struct platform_device *pdev)
	332	{
	333	struct twl_pwm_chip *twl = platform_get_drvdata(pdev);
	334
	335	return pwmchip_remove(&twl->chip);
	336	}
	337
	338	#ifdef CONFIG_OF
	339	static struct of_device_id twl_pwm_of_match[] = {
	340	{ .compatible = "ti,twl4030-pwm" },
	341	{ .compatible = "ti,twl6030-pwm" },
	342	{ },
	343	};
	344	MODULE_DEVICE_TABLE(of, twl_pwm_of_match);
	345	#endif
	346
	347	static struct platform_driver twl_pwm_driver = {
	348	.driver = {
	349	.name = "twl-pwm",
	350	.of_match_table = of_match_ptr(twl_pwm_of_match),
	351	},
	352	.probe = twl_pwm_probe,
	353	.remove = twl_pwm_remove,
	354	};
	355	module_platform_driver(twl_pwm_driver);
	356
	357	MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
	358	MODULE_DESCRIPTION("PWM driver for TWL4030 and TWL6030");
	359	MODULE_ALIAS("platform:twl-pwm");
	360	MODULE_LICENSE("GPL");