[linux-2.6-block.git] / drivers / pwm / pwm-ab8500.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * Author: Arun R Murthy <arun.murthy@stericsson.com>
 */
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/pwm.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/module.h>

/*
 * PWM Out generators
 * Bank: 0x10
 */
#define AB8500_PWM_OUT_CTRL1_REG	0x60
#define AB8500_PWM_OUT_CTRL2_REG	0x61
#define AB8500_PWM_OUT_CTRL7_REG	0x66

struct ab8500_pwm_chip {
	struct pwm_chip chip;
	unsigned int hwid;
};

static struct ab8500_pwm_chip *ab8500_pwm_from_chip(struct pwm_chip *chip)
{
	return container_of(chip, struct ab8500_pwm_chip, chip);
}

static int ab8500_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			    const struct pwm_state *state)
{
	int ret;
	u8 reg;
	unsigned int higher_val, lower_val;
	struct ab8500_pwm_chip *ab8500 = ab8500_pwm_from_chip(chip);

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

	if (!state->enabled) {
		ret = abx500_mask_and_set_register_interruptible(chip->dev,
					AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
					1 << ab8500->hwid, 0);

		if (ret < 0)
			dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
								pwm->label, ret);
		return ret;
	}

	/*
	 * get the first 8 bits that are be written to
	 * AB8500_PWM_OUT_CTRL1_REG[0:7]
	 */
	lower_val = state->duty_cycle & 0x00FF;
	/*
	 * get bits [9:10] that are to be written to
	 * AB8500_PWM_OUT_CTRL2_REG[0:1]
	 */
	higher_val = ((state->duty_cycle & 0x0300) >> 8);

	reg = AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2);

	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
			reg, (u8)lower_val);
	if (ret < 0)
		return ret;

	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
			(reg + 1), (u8)higher_val);
	if (ret < 0)
		return ret;

	ret = abx500_mask_and_set_register_interruptible(chip->dev,
				AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
				1 << ab8500->hwid, 1 << ab8500->hwid);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
							pwm->label, ret);

	return ret;
}

static const struct pwm_ops ab8500_pwm_ops = {
	.apply = ab8500_pwm_apply,
	.owner = THIS_MODULE,
};

static int ab8500_pwm_probe(struct platform_device *pdev)
{
	struct ab8500_pwm_chip *ab8500;
	int err;

	if (pdev->id < 1 || pdev->id > 31)
		return dev_err_probe(&pdev->dev, EINVAL, "Invalid device id %d\n", pdev->id);

	/*
	 * Nothing to be done in probe, this is required to get the
	 * device which is required for ab8500 read and write
	 */
	ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
	if (ab8500 == NULL)
		return -ENOMEM;

	ab8500->chip.dev = &pdev->dev;
	ab8500->chip.ops = &ab8500_pwm_ops;
	ab8500->chip.npwm = 1;
	ab8500->hwid = pdev->id - 1;

	err = devm_pwmchip_add(&pdev->dev, &ab8500->chip);
	if (err < 0)
		return dev_err_probe(&pdev->dev, err, "Failed to add pwm chip\n");

	dev_dbg(&pdev->dev, "pwm probe successful\n");

	return 0;
}

static struct platform_driver ab8500_pwm_driver = {
	.driver = {
		.name = "ab8500-pwm",
	},
	.probe = ab8500_pwm_probe,
};
module_platform_driver(ab8500_pwm_driver);

MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
MODULE_ALIAS("platform:ab8500-pwm");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
af873fce	1	// SPDX-License-Identifier: GPL-2.0-only
f0f05b1c AM	2	/*
	3	* Copyright (C) ST-Ericsson SA 2010
	4	*
	5	* Author: Arun R Murthy <arun.murthy@stericsson.com>
f0f05b1c AM	6	*/
	7	#include <linux/err.h>
	8	#include <linux/platform_device.h>
	9	#include <linux/slab.h>
	10	#include <linux/pwm.h>
f0f05b1c	11	#include <linux/mfd/abx500.h>
ee66e653	12	#include <linux/mfd/abx500/ab8500.h>
eb12a679	13	#include <linux/module.h>
f0f05b1c AM	14
	15	/*
	16	* PWM Out generators
	17	* Bank: 0x10
	18	*/
	19	#define AB8500_PWM_OUT_CTRL1_REG 0x60
	20	#define AB8500_PWM_OUT_CTRL2_REG 0x61
	21	#define AB8500_PWM_OUT_CTRL7_REG 0x66
	22
6173f8f4 TR	23	struct ab8500_pwm_chip {
6173f8f4 TR	24	struct pwm_chip chip;
eb41f334	25	unsigned int hwid;
f0f05b1c AM	26	};
f0f05b1c AM	27
eb41f334 UKK	28	static struct ab8500_pwm_chip ab8500_pwm_from_chip(struct pwm_chip chip)
	29	{
	30	return container_of(chip, struct ab8500_pwm_chip, chip);
	31	}
	32
acf3402d UKK	33	static int ab8500_pwm_apply(struct pwm_chip chip, struct pwm_device pwm,
acf3402d UKK	34	const struct pwm_state *state)
f0f05b1c	35	{
acf3402d	36	int ret;
f0f05b1c	37	u8 reg;
acf3402d	38	unsigned int higher_val, lower_val;
eb41f334	39	struct ab8500_pwm_chip *ab8500 = ab8500_pwm_from_chip(chip);
acf3402d UKK	40
	41	if (state->polarity != PWM_POLARITY_NORMAL)
	42	return -EINVAL;
	43
	44	if (!state->enabled) {
	45	ret = abx500_mask_and_set_register_interruptible(chip->dev,
	46	AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
eb41f334	47	1 << ab8500->hwid, 0);
acf3402d UKK	48
	49	if (ret < 0)
	50	dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
	51	pwm->label, ret);
	52	return ret;
	53	}
f0f05b1c AM	54
	55	/*
	56	* get the first 8 bits that are be written to
	57	* AB8500_PWM_OUT_CTRL1_REG[0:7]
	58	*/
acf3402d	59	lower_val = state->duty_cycle & 0x00FF;
f0f05b1c AM	60	/*
	61	* get bits [9:10] that are to be written to
	62	* AB8500_PWM_OUT_CTRL2_REG[0:1]
	63	*/
acf3402d	64	higher_val = ((state->duty_cycle & 0x0300) >> 8);
f0f05b1c	65
eb41f334	66	reg = AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2);
f0f05b1c	67
6173f8f4	68	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
f0f05b1c AM	69	reg, (u8)lower_val);
	70	if (ret < 0)
	71	return ret;
acf3402d	72
6173f8f4	73	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
f0f05b1c	74	(reg + 1), (u8)higher_val);
acf3402d UKK	75	if (ret < 0)
acf3402d UKK	76	return ret;
f0f05b1c	77
6173f8f4	78	ret = abx500_mask_and_set_register_interruptible(chip->dev,
f0f05b1c	79	AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
eb41f334	80	1 << ab8500->hwid, 1 << ab8500->hwid);
f0f05b1c	81	if (ret < 0)
622fc5d4	82	dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
f0f05b1c	83	pwm->label, ret);
f0f05b1c	84
acf3402d	85	return ret;
f0f05b1c	86	}
f0f05b1c	87
6173f8f4	88	static const struct pwm_ops ab8500_pwm_ops = {
acf3402d	89	.apply = ab8500_pwm_apply,
fa0abee9	90	.owner = THIS_MODULE,
6173f8f4	91	};
f0f05b1c	92
3e9fe83d	93	static int ab8500_pwm_probe(struct platform_device *pdev)
f0f05b1c	94	{
6173f8f4 TR	95	struct ab8500_pwm_chip *ab8500;
	96	int err;
	97
eb41f334 UKK	98	if (pdev->id < 1 \|\| pdev->id > 31)
	99	return dev_err_probe(&pdev->dev, EINVAL, "Invalid device id %d\n", pdev->id);
	100
f0f05b1c AM	101	/*
	102	* Nothing to be done in probe, this is required to get the
	103	* device which is required for ab8500 read and write
	104	*/
482467ad	105	ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
a2fc1db6	106	if (ab8500 == NULL)
f0f05b1c	107	return -ENOMEM;
6173f8f4 TR	108
	109	ab8500->chip.dev = &pdev->dev;
	110	ab8500->chip.ops = &ab8500_pwm_ops;
6173f8f4	111	ab8500->chip.npwm = 1;
eb41f334	112	ab8500->hwid = pdev->id - 1;
6173f8f4	113
14ac9e17	114	err = devm_pwmchip_add(&pdev->dev, &ab8500->chip);
482467ad	115	if (err < 0)
2e978a45	116	return dev_err_probe(&pdev->dev, err, "Failed to add pwm chip\n");
6173f8f4 TR	117
6173f8f4 TR	118	dev_dbg(&pdev->dev, "pwm probe successful\n");
6173f8f4	119
f0f05b1c AM	120	return 0;
	121	}
	122
	123	static struct platform_driver ab8500_pwm_driver = {
	124	.driver = {
	125	.name = "ab8500-pwm",
f0f05b1c AM	126	},
f0f05b1c AM	127	.probe = ab8500_pwm_probe,
f0f05b1c	128	};
6173f8f4	129	module_platform_driver(ab8500_pwm_driver);
f0f05b1c	130
f0f05b1c AM	131	MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
f0f05b1c AM	132	MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
37b7bf67	133	MODULE_ALIAS("platform:ab8500-pwm");
f0f05b1c	134	MODULE_LICENSE("GPL v2");