[deliverable/linux.git] / drivers / regulator / wm8994-regulator.c

/*
 * wm8994-regulator.c  --  Regulator driver for the WM8994
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/gpio.h>
#include <linux/slab.h>

#include <linux/mfd/wm8994/core.h>
#include <linux/mfd/wm8994/registers.h>
#include <linux/mfd/wm8994/pdata.h>

struct wm8994_ldo {
	int enable;
	bool is_enabled;
	struct regulator_dev *regulator;
	struct wm8994 *wm8994;
};

#define WM8994_LDO1_MAX_SELECTOR 0x7
#define WM8994_LDO2_MAX_SELECTOR 0x3

static int wm8994_ldo_enable(struct regulator_dev *rdev)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	/* If we have no soft control assume that the LDO is always enabled. */
	if (!ldo->enable)
		return 0;

	gpio_set_value_cansleep(ldo->enable, 1);
	ldo->is_enabled = true;

	return 0;
}

static int wm8994_ldo_disable(struct regulator_dev *rdev)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	/* If we have no soft control assume that the LDO is always enabled. */
	if (!ldo->enable)
		return -EINVAL;

	gpio_set_value_cansleep(ldo->enable, 0);
	ldo->is_enabled = false;

	return 0;
}

static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	return ldo->is_enabled;
}

static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
{
	/* 3ms is fairly conservative but this shouldn't be too performance
	 * critical; can be tweaked per-system if required. */
	return 3000;
}

static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
				    unsigned int selector)
{
	if (selector > WM8994_LDO1_MAX_SELECTOR)
		return -EINVAL;

	return (selector * 100000) + 2400000;
}

static struct regulator_ops wm8994_ldo1_ops = {
	.enable = wm8994_ldo_enable,
	.disable = wm8994_ldo_disable,
	.is_enabled = wm8994_ldo_is_enabled,
	.enable_time = wm8994_ldo_enable_time,

	.list_voltage = wm8994_ldo1_list_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
				    unsigned int selector)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	if (selector > WM8994_LDO2_MAX_SELECTOR)
		return -EINVAL;

	switch (ldo->wm8994->type) {
	case WM8994:
		return (selector * 100000) + 900000;
	case WM8958:
		return (selector * 100000) + 1000000;
	case WM1811:
		switch (selector) {
		case 0:
			return -EINVAL;
		default:
			return (selector * 100000) + 950000;
		}
		break;
	default:
		return -EINVAL;
	}
}

static struct regulator_ops wm8994_ldo2_ops = {
	.enable = wm8994_ldo_enable,
	.disable = wm8994_ldo_disable,
	.is_enabled = wm8994_ldo_is_enabled,
	.enable_time = wm8994_ldo_enable_time,

	.list_voltage = wm8994_ldo2_list_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc wm8994_ldo_desc[] = {
	{
		.name = "LDO1",
		.id = 1,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
		.vsel_reg = WM8994_LDO_1,
		.vsel_mask = WM8994_LDO1_VSEL_MASK,
		.ops = &wm8994_ldo1_ops,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO2",
		.id = 2,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
		.vsel_reg = WM8994_LDO_2,
		.vsel_mask = WM8994_LDO2_VSEL_MASK,
		.ops = &wm8994_ldo2_ops,
		.owner = THIS_MODULE,
	},
};

static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
	struct regulator_config config = { };
	struct wm8994_ldo *ldo;
	int ret;

	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);

	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
	if (ldo == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	ldo->wm8994 = wm8994;

	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
		ldo->enable = pdata->ldo[id].enable;

		ret = gpio_request_one(ldo->enable, 0, "WM8994 LDO enable");
		if (ret < 0) {
			dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
				ret);
			goto err;
		}
	} else
		ldo->is_enabled = true;

	config.dev = wm8994->dev;
	config.driver_data = ldo;
	config.regmap = wm8994->regmap;
	if (pdata)
		config.init_data = pdata->ldo[id].init_data;

	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
	if (IS_ERR(ldo->regulator)) {
		ret = PTR_ERR(ldo->regulator);
		dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
			id + 1, ret);
		goto err_gpio;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;

err_gpio:
	if (gpio_is_valid(ldo->enable))
		gpio_free(ldo->enable);
err:
	return ret;
}

static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
{
	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	regulator_unregister(ldo->regulator);
	if (gpio_is_valid(ldo->enable))
		gpio_free(ldo->enable);

	return 0;
}

static struct platform_driver wm8994_ldo_driver = {
	.probe = wm8994_ldo_probe,
	.remove = __devexit_p(wm8994_ldo_remove),
	.driver		= {
		.name	= "wm8994-ldo",
		.owner	= THIS_MODULE,
	},
};

static int __init wm8994_ldo_init(void)
{
	int ret;

	ret = platform_driver_register(&wm8994_ldo_driver);
	if (ret != 0)
		pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);

	return ret;
}
subsys_initcall(wm8994_ldo_init);

static void __exit wm8994_ldo_exit(void)
{
	platform_driver_unregister(&wm8994_ldo_driver);
}
module_exit(wm8994_ldo_exit);

/* Module information */
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_DESCRIPTION("WM8994 LDO driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm8994-ldo");
Commit	Line	Data
69dc16c3 MB	1	/*
	2	* wm8994-regulator.c -- Regulator driver for the WM8994
	3	*
	4	* Copyright 2009 Wolfson Microelectronics PLC.
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/moduleparam.h>
	16	#include <linux/init.h>
	17	#include <linux/bitops.h>
	18	#include <linux/err.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regulator/driver.h>
	21	#include <linux/gpio.h>
5a0e3ad6	22	#include <linux/slab.h>
69dc16c3 MB	23
	24	#include <linux/mfd/wm8994/core.h>
	25	#include <linux/mfd/wm8994/registers.h>
	26	#include <linux/mfd/wm8994/pdata.h>
	27
	28	struct wm8994_ldo {
	29	int enable;
598b3578	30	bool is_enabled;
69dc16c3 MB	31	struct regulator_dev *regulator;
	32	struct wm8994 *wm8994;
	33	};
	34
	35	#define WM8994_LDO1_MAX_SELECTOR 0x7
	36	#define WM8994_LDO2_MAX_SELECTOR 0x3
	37
	38	static int wm8994_ldo_enable(struct regulator_dev *rdev)
	39	{
	40	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	41
	42	/* If we have no soft control assume that the LDO is always enabled. */
	43	if (!ldo->enable)
	44	return 0;
	45
2ae3636b	46	gpio_set_value_cansleep(ldo->enable, 1);
598b3578	47	ldo->is_enabled = true;
69dc16c3 MB	48
	49	return 0;
	50	}
	51
	52	static int wm8994_ldo_disable(struct regulator_dev *rdev)
	53	{
	54	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	55
	56	/* If we have no soft control assume that the LDO is always enabled. */
	57	if (!ldo->enable)
	58	return -EINVAL;
	59
2ae3636b	60	gpio_set_value_cansleep(ldo->enable, 0);
598b3578	61	ldo->is_enabled = false;
69dc16c3 MB	62
	63	return 0;
	64	}
	65
	66	static int wm8994_ldo_is_enabled(struct regulator_dev *rdev)
	67	{
	68	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	69
	70	return ldo->is_enabled;
	71	}
	72
	73	static int wm8994_ldo_enable_time(struct regulator_dev *rdev)
	74	{
	75	/* 3ms is fairly conservative but this shouldn't be too performance
	76	* critical; can be tweaked per-system if required. */
	77	return 3000;
	78	}
	79
	80	static int wm8994_ldo1_list_voltage(struct regulator_dev *rdev,
	81	unsigned int selector)
	82	{
	83	if (selector > WM8994_LDO1_MAX_SELECTOR)
	84	return -EINVAL;
	85
	86	return (selector * 100000) + 2400000;
	87	}
	88
69dc16c3 MB	89	static struct regulator_ops wm8994_ldo1_ops = {
	90	.enable = wm8994_ldo_enable,
	91	.disable = wm8994_ldo_disable,
	92	.is_enabled = wm8994_ldo_is_enabled,
	93	.enable_time = wm8994_ldo_enable_time,
	94
	95	.list_voltage = wm8994_ldo1_list_voltage,
633b6fcd MB	96	.get_voltage_sel = regulator_get_voltage_sel_regmap,
633b6fcd MB	97	.set_voltage_sel = regulator_set_voltage_sel_regmap,
69dc16c3 MB	98	};
	99
	100	static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
	101	unsigned int selector)
	102	{
5a7743ed MB	103	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
5a7743ed MB	104
69dc16c3 MB	105	if (selector > WM8994_LDO2_MAX_SELECTOR)
	106	return -EINVAL;
	107
5a7743ed MB	108	switch (ldo->wm8994->type) {
	109	case WM8994:
	110	return (selector * 100000) + 900000;
	111	case WM8958:
	112	return (selector * 100000) + 1000000;
a1ff89ef MB	113	case WM1811:
	114	switch (selector) {
	115	case 0:
	116	return -EINVAL;
	117	default:
	118	return (selector * 100000) + 950000;
	119	}
	120	break;
5a7743ed MB	121	default:
	122	return -EINVAL;
	123	}
69dc16c3 MB	124	}
69dc16c3 MB	125
69dc16c3 MB	126	static struct regulator_ops wm8994_ldo2_ops = {
	127	.enable = wm8994_ldo_enable,
	128	.disable = wm8994_ldo_disable,
	129	.is_enabled = wm8994_ldo_is_enabled,
	130	.enable_time = wm8994_ldo_enable_time,
	131
	132	.list_voltage = wm8994_ldo2_list_voltage,
633b6fcd MB	133	.get_voltage_sel = regulator_get_voltage_sel_regmap,
633b6fcd MB	134	.set_voltage_sel = regulator_set_voltage_sel_regmap,
69dc16c3 MB	135	};
69dc16c3 MB	136
25e4d602	137	static const struct regulator_desc wm8994_ldo_desc[] = {
69dc16c3 MB	138	{
	139	.name = "LDO1",
	140	.id = 1,
	141	.type = REGULATOR_VOLTAGE,
	142	.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
633b6fcd MB	143	.vsel_reg = WM8994_LDO_1,
633b6fcd MB	144	.vsel_mask = WM8994_LDO1_VSEL_MASK,
69dc16c3 MB	145	.ops = &wm8994_ldo1_ops,
	146	.owner = THIS_MODULE,
	147	},
	148	{
	149	.name = "LDO2",
	150	.id = 2,
	151	.type = REGULATOR_VOLTAGE,
	152	.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
633b6fcd MB	153	.vsel_reg = WM8994_LDO_2,
633b6fcd MB	154	.vsel_mask = WM8994_LDO2_VSEL_MASK,
69dc16c3 MB	155	.ops = &wm8994_ldo2_ops,
	156	.owner = THIS_MODULE,
	157	},
	158	};
	159
	160	static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
	161	{
	162	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	163	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	164	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
c172708d	165	struct regulator_config config = { };
69dc16c3 MB	166	struct wm8994_ldo *ldo;
	167	int ret;
	168
	169	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
	170
b9e0348f	171	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
69dc16c3 MB	172	if (ldo == NULL) {
	173	dev_err(&pdev->dev, "Unable to allocate private data\n");
	174	return -ENOMEM;
	175	}
	176
	177	ldo->wm8994 = wm8994;
	178
69dc16c3 MB	179	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
	180	ldo->enable = pdata->ldo[id].enable;
	181
09e3fd20	182	ret = gpio_request_one(ldo->enable, 0, "WM8994 LDO enable");
69dc16c3 MB	183	if (ret < 0) {
	184	dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
	185	ret);
	186	goto err;
	187	}
c4604e49 JS	188	} else
c4604e49 JS	189	ldo->is_enabled = true;
69dc16c3	190
5d0526ea	191	config.dev = wm8994->dev;
c172708d	192	config.driver_data = ldo;
633b6fcd	193	config.regmap = wm8994->regmap;
b68b45d7 MB	194	if (pdata)
b68b45d7 MB	195	config.init_data = pdata->ldo[id].init_data;
c172708d MB	196
c172708d MB	197	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
69dc16c3 MB	198	if (IS_ERR(ldo->regulator)) {
	199	ret = PTR_ERR(ldo->regulator);
	200	dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
	201	id + 1, ret);
	202	goto err_gpio;
	203	}
	204
	205	platform_set_drvdata(pdev, ldo);
	206
	207	return 0;
	208
	209	err_gpio:
	210	if (gpio_is_valid(ldo->enable))
	211	gpio_free(ldo->enable);
	212	err:
69dc16c3 MB	213	return ret;
	214	}
	215
	216	static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
	217	{
	218	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
	219
598b3578 DT	220	platform_set_drvdata(pdev, NULL);
598b3578 DT	221
69dc16c3 MB	222	regulator_unregister(ldo->regulator);
	223	if (gpio_is_valid(ldo->enable))
	224	gpio_free(ldo->enable);
69dc16c3 MB	225
	226	return 0;
	227	}
	228
	229	static struct platform_driver wm8994_ldo_driver = {
	230	.probe = wm8994_ldo_probe,
	231	.remove = __devexit_p(wm8994_ldo_remove),
	232	.driver = {
	233	.name = "wm8994-ldo",
598b3578	234	.owner = THIS_MODULE,
69dc16c3 MB	235	},
	236	};
	237
	238	static int __init wm8994_ldo_init(void)
	239	{
	240	int ret;
	241
	242	ret = platform_driver_register(&wm8994_ldo_driver);
	243	if (ret != 0)
	244	pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
	245
	246	return ret;
	247	}
	248	subsys_initcall(wm8994_ldo_init);
	249
	250	static void __exit wm8994_ldo_exit(void)
	251	{
	252	platform_driver_unregister(&wm8994_ldo_driver);
	253	}
	254	module_exit(wm8994_ldo_exit);
	255
	256	/* Module information */
	257	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	258	MODULE_DESCRIPTION("WM8994 LDO driver");
	259	MODULE_LICENSE("GPL");
	260	MODULE_ALIAS("platform:wm8994-ldo");