[mirror_ubuntu-bionic-kernel.git] / drivers / pwm / pwm-ab8500.c

/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * Author: Arun R Murthy <arun.murthy@stericsson.com>
 * License terms: GNU General Public License (GPL) version 2
 */
#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

/* backlight driver constants */
#define ENABLE_PWM			1
#define DISABLE_PWM			0

struct ab8500_pwm_chip {
	struct pwm_chip chip;
};

static int ab8500_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
			     int duty_ns, int period_ns)
{
	int ret = 0;
	unsigned int higher_val, lower_val;
	u8 reg;

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

	reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 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);

	return ret;
}

static int ab8500_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	int ret;

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

static void ab8500_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	int ret;

	ret = abx500_mask_and_set_register_interruptible(chip->dev,
				AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
				1 << (chip->base - 1), DISABLE_PWM);
	if (ret < 0)
		dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
							pwm->label, ret);
	return;
}

static const struct pwm_ops ab8500_pwm_ops = {
	.config = ab8500_pwm_config,
	.enable = ab8500_pwm_enable,
	.disable = ab8500_pwm_disable,
	.owner = THIS_MODULE,
};

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

	/*
	 * 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) {
		dev_err(&pdev->dev, "failed to allocate memory\n");
		return -ENOMEM;
	}

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

	err = pwmchip_add(&ab8500->chip);
	if (err < 0)
		return err;

	dev_dbg(&pdev->dev, "pwm probe successful\n");
	platform_set_drvdata(pdev, ab8500);

	return 0;
}

static int ab8500_pwm_remove(struct platform_device *pdev)
{
	struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
	int err;

	err = pwmchip_remove(&ab8500->chip);
	if (err < 0)
		return err;

	dev_dbg(&pdev->dev, "pwm driver removed\n");

	return 0;
}

static struct platform_driver ab8500_pwm_driver = {
	.driver = {
		.name = "ab8500-pwm",
		.owner = THIS_MODULE,
	},
	.probe = ab8500_pwm_probe,
	.remove = ab8500_pwm_remove,
};
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
f0f05b1c AM	1	/*
	2	* Copyright (C) ST-Ericsson SA 2010
	3	*
	4	* Author: Arun R Murthy <arun.murthy@stericsson.com>
	5	* License terms: GNU General Public License (GPL) version 2
	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
	23	/* backlight driver constants */
	24	#define ENABLE_PWM 1
	25	#define DISABLE_PWM 0
	26
6173f8f4 TR	27	struct ab8500_pwm_chip {
6173f8f4 TR	28	struct pwm_chip chip;
f0f05b1c AM	29	};
f0f05b1c AM	30
6173f8f4 TR	31	static int ab8500_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
6173f8f4 TR	32	int duty_ns, int period_ns)
f0f05b1c AM	33	{
	34	int ret = 0;
	35	unsigned int higher_val, lower_val;
	36	u8 reg;
	37
	38	/*
	39	* get the first 8 bits that are be written to
	40	* AB8500_PWM_OUT_CTRL1_REG[0:7]
	41	*/
	42	lower_val = duty_ns & 0x00FF;
	43	/*
	44	* get bits [9:10] that are to be written to
	45	* AB8500_PWM_OUT_CTRL2_REG[0:1]
	46	*/
	47	higher_val = ((duty_ns & 0x0300) >> 8);
	48
6173f8f4	49	reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2);
f0f05b1c	50
6173f8f4	51	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
f0f05b1c AM	52	reg, (u8)lower_val);
	53	if (ret < 0)
	54	return ret;
6173f8f4	55	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
f0f05b1c AM	56	(reg + 1), (u8)higher_val);
	57
	58	return ret;
	59	}
f0f05b1c	60
6173f8f4	61	static int ab8500_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
f0f05b1c AM	62	{
	63	int ret;
	64
6173f8f4	65	ret = abx500_mask_and_set_register_interruptible(chip->dev,
f0f05b1c	66	AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
6173f8f4	67	1 << (chip->base - 1), ENABLE_PWM);
f0f05b1c	68	if (ret < 0)
622fc5d4	69	dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
f0f05b1c AM	70	pwm->label, ret);
	71	return ret;
	72	}
f0f05b1c	73
6173f8f4	74	static void ab8500_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
f0f05b1c AM	75	{
	76	int ret;
	77
6173f8f4	78	ret = abx500_mask_and_set_register_interruptible(chip->dev,
f0f05b1c	79	AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
6173f8f4	80	1 << (chip->base - 1), DISABLE_PWM);
f0f05b1c	81	if (ret < 0)
6173f8f4	82	dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
f0f05b1c AM	83	pwm->label, ret);
	84	return;
	85	}
f0f05b1c	86
6173f8f4 TR	87	static const struct pwm_ops ab8500_pwm_ops = {
	88	.config = ab8500_pwm_config,
	89	.enable = ab8500_pwm_enable,
	90	.disable = ab8500_pwm_disable,
fa0abee9	91	.owner = THIS_MODULE,
6173f8f4	92	};
f0f05b1c	93
3e9fe83d	94	static int ab8500_pwm_probe(struct platform_device *pdev)
f0f05b1c	95	{
6173f8f4 TR	96	struct ab8500_pwm_chip *ab8500;
	97	int err;
	98
f0f05b1c AM	99	/*
	100	* Nothing to be done in probe, this is required to get the
	101	* device which is required for ab8500 read and write
	102	*/
482467ad	103	ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
6173f8f4	104	if (ab8500 == NULL) {
f0f05b1c AM	105	dev_err(&pdev->dev, "failed to allocate memory\n");
	106	return -ENOMEM;
	107	}
6173f8f4 TR	108
	109	ab8500->chip.dev = &pdev->dev;
	110	ab8500->chip.ops = &ab8500_pwm_ops;
	111	ab8500->chip.base = pdev->id;
	112	ab8500->chip.npwm = 1;
	113
	114	err = pwmchip_add(&ab8500->chip);
482467ad	115	if (err < 0)
6173f8f4	116	return err;
6173f8f4 TR	117
	118	dev_dbg(&pdev->dev, "pwm probe successful\n");
	119	platform_set_drvdata(pdev, ab8500);
	120
f0f05b1c AM	121	return 0;
	122	}
	123
77f37917	124	static int ab8500_pwm_remove(struct platform_device *pdev)
f0f05b1c	125	{
6173f8f4 TR	126	struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
	127	int err;
	128
	129	err = pwmchip_remove(&ab8500->chip);
	130	if (err < 0)
	131	return err;
	132
f0f05b1c	133	dev_dbg(&pdev->dev, "pwm driver removed\n");
6173f8f4	134
f0f05b1c AM	135	return 0;
	136	}
	137
	138	static struct platform_driver ab8500_pwm_driver = {
	139	.driver = {
	140	.name = "ab8500-pwm",
	141	.owner = THIS_MODULE,
	142	},
	143	.probe = ab8500_pwm_probe,
fd109112	144	.remove = ab8500_pwm_remove,
f0f05b1c	145	};
6173f8f4	146	module_platform_driver(ab8500_pwm_driver);
f0f05b1c	147
f0f05b1c AM	148	MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
f0f05b1c AM	149	MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
37b7bf67	150	MODULE_ALIAS("platform:ab8500-pwm");
f0f05b1c	151	MODULE_LICENSE("GPL v2");