[linux-2.6-block.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

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

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)
		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",
	},
	.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
6173f8f4 TR	23	struct ab8500_pwm_chip {
6173f8f4 TR	24	struct pwm_chip chip;
f0f05b1c AM	25	};
f0f05b1c AM	26
6173f8f4 TR	27	static int ab8500_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
6173f8f4 TR	28	int duty_ns, int period_ns)
f0f05b1c AM	29	{
	30	int ret = 0;
	31	unsigned int higher_val, lower_val;
	32	u8 reg;
	33
	34	/*
	35	* get the first 8 bits that are be written to
	36	* AB8500_PWM_OUT_CTRL1_REG[0:7]
	37	*/
	38	lower_val = duty_ns & 0x00FF;
	39	/*
	40	* get bits [9:10] that are to be written to
	41	* AB8500_PWM_OUT_CTRL2_REG[0:1]
	42	*/
	43	higher_val = ((duty_ns & 0x0300) >> 8);
	44
6173f8f4	45	reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2);
f0f05b1c	46
6173f8f4	47	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
f0f05b1c AM	48	reg, (u8)lower_val);
	49	if (ret < 0)
	50	return ret;
6173f8f4	51	ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC,
f0f05b1c AM	52	(reg + 1), (u8)higher_val);
	53
	54	return ret;
	55	}
f0f05b1c	56
6173f8f4	57	static int ab8500_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
f0f05b1c AM	58	{
	59	int ret;
	60
6173f8f4	61	ret = abx500_mask_and_set_register_interruptible(chip->dev,
f0f05b1c	62	AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
54b02347	63	1 << (chip->base - 1), 1 << (chip->base - 1));
f0f05b1c	64	if (ret < 0)
622fc5d4	65	dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n",
f0f05b1c AM	66	pwm->label, ret);
	67	return ret;
	68	}
f0f05b1c	69
6173f8f4	70	static void ab8500_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
f0f05b1c AM	71	{
	72	int ret;
	73
6173f8f4	74	ret = abx500_mask_and_set_register_interruptible(chip->dev,
f0f05b1c	75	AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG,
54b02347	76	1 << (chip->base - 1), 0);
f0f05b1c	77	if (ret < 0)
6173f8f4	78	dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n",
f0f05b1c	79	pwm->label, ret);
f0f05b1c	80	}
f0f05b1c	81
6173f8f4 TR	82	static const struct pwm_ops ab8500_pwm_ops = {
	83	.config = ab8500_pwm_config,
	84	.enable = ab8500_pwm_enable,
	85	.disable = ab8500_pwm_disable,
fa0abee9	86	.owner = THIS_MODULE,
6173f8f4	87	};
f0f05b1c	88
3e9fe83d	89	static int ab8500_pwm_probe(struct platform_device *pdev)
f0f05b1c	90	{
6173f8f4 TR	91	struct ab8500_pwm_chip *ab8500;
	92	int err;
	93
f0f05b1c AM	94	/*
	95	* Nothing to be done in probe, this is required to get the
	96	* device which is required for ab8500 read and write
	97	*/
482467ad	98	ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL);
a2fc1db6	99	if (ab8500 == NULL)
f0f05b1c	100	return -ENOMEM;
6173f8f4 TR	101
	102	ab8500->chip.dev = &pdev->dev;
	103	ab8500->chip.ops = &ab8500_pwm_ops;
	104	ab8500->chip.base = pdev->id;
	105	ab8500->chip.npwm = 1;
	106
	107	err = pwmchip_add(&ab8500->chip);
482467ad	108	if (err < 0)
6173f8f4	109	return err;
6173f8f4 TR	110
	111	dev_dbg(&pdev->dev, "pwm probe successful\n");
	112	platform_set_drvdata(pdev, ab8500);
	113
f0f05b1c AM	114	return 0;
	115	}
	116
77f37917	117	static int ab8500_pwm_remove(struct platform_device *pdev)
f0f05b1c	118	{
6173f8f4 TR	119	struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev);
	120	int err;
	121
	122	err = pwmchip_remove(&ab8500->chip);
	123	if (err < 0)
	124	return err;
	125
f0f05b1c	126	dev_dbg(&pdev->dev, "pwm driver removed\n");
6173f8f4	127
f0f05b1c AM	128	return 0;
	129	}
	130
	131	static struct platform_driver ab8500_pwm_driver = {
	132	.driver = {
	133	.name = "ab8500-pwm",
f0f05b1c AM	134	},
f0f05b1c AM	135	.probe = ab8500_pwm_probe,
fd109112	136	.remove = ab8500_pwm_remove,
f0f05b1c	137	};
6173f8f4	138	module_platform_driver(ab8500_pwm_driver);
f0f05b1c	139
f0f05b1c AM	140	MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>");
f0f05b1c AM	141	MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver");
37b7bf67	142	MODULE_ALIAS("platform:ab8500-pwm");
f0f05b1c	143	MODULE_LICENSE("GPL v2");