[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 int wm8994_ldo1_get_voltage_sel(struct regulator_dev *rdev)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int val;

	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
	if (val < 0)
		return val;

	return (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
}

static int wm8994_ldo1_set_voltage_sel(struct regulator_dev *rdev,
				       unsigned selector)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	selector <<= WM8994_LDO1_VSEL_SHIFT;

	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
			       WM8994_LDO1_VSEL_MASK, selector);
}

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 = wm8994_ldo1_get_voltage_sel,
	.set_voltage_sel = wm8994_ldo1_set_voltage_sel,
};

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 int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int val;

	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
	if (val < 0)
		return val;

	return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
}

static int wm8994_ldo2_set_voltage_sel(struct regulator_dev *rdev,
				       unsigned selector)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);

	selector <<= WM8994_LDO2_VSEL_SHIFT;

	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
			       WM8994_LDO2_VSEL_MASK, selector);
}

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 = wm8994_ldo2_get_voltage_sel,
	.set_voltage_sel = wm8994_ldo2_set_voltage_sel,
};

static const struct regulator_desc wm8994_ldo_desc[] = {
	{
		.name = "LDO1",
		.id = 1,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
		.ops = &wm8994_ldo1_ops,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO2",
		.id = 2,
		.type = REGULATOR_VOLTAGE,
		.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
		.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);

	if (!pdata)
		return -ENODEV;

	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 = &pdev->dev;
	config.init_data = pdata->ldo[id].init_data;
	config.driver_data = ldo;

	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
d9f0f287	89	static int wm8994_ldo1_get_voltage_sel(struct regulator_dev *rdev)
69dc16c3 MB	90	{
	91	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	92	int val;
	93
	94	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_1);
	95	if (val < 0)
	96	return val;
	97
d9f0f287	98	return (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
69dc16c3 MB	99	}
69dc16c3 MB	100
9f29c9e3 MB	101	static int wm8994_ldo1_set_voltage_sel(struct regulator_dev *rdev,
9f29c9e3 MB	102	unsigned selector)
69dc16c3 MB	103	{
69dc16c3 MB	104	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
69dc16c3	105
69dc16c3 MB	106	selector <<= WM8994_LDO1_VSEL_SHIFT;
	107
	108	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
	109	WM8994_LDO1_VSEL_MASK, selector);
	110	}
	111
	112	static struct regulator_ops wm8994_ldo1_ops = {
	113	.enable = wm8994_ldo_enable,
	114	.disable = wm8994_ldo_disable,
	115	.is_enabled = wm8994_ldo_is_enabled,
	116	.enable_time = wm8994_ldo_enable_time,
	117
	118	.list_voltage = wm8994_ldo1_list_voltage,
d9f0f287	119	.get_voltage_sel = wm8994_ldo1_get_voltage_sel,
9f29c9e3	120	.set_voltage_sel = wm8994_ldo1_set_voltage_sel,
69dc16c3 MB	121	};
	122
	123	static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
	124	unsigned int selector)
	125	{
5a7743ed MB	126	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
5a7743ed MB	127
69dc16c3 MB	128	if (selector > WM8994_LDO2_MAX_SELECTOR)
	129	return -EINVAL;
	130
5a7743ed MB	131	switch (ldo->wm8994->type) {
	132	case WM8994:
	133	return (selector * 100000) + 900000;
	134	case WM8958:
	135	return (selector * 100000) + 1000000;
a1ff89ef MB	136	case WM1811:
	137	switch (selector) {
	138	case 0:
	139	return -EINVAL;
	140	default:
	141	return (selector * 100000) + 950000;
	142	}
	143	break;
5a7743ed MB	144	default:
	145	return -EINVAL;
	146	}
69dc16c3 MB	147	}
69dc16c3 MB	148
d9f0f287	149	static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
69dc16c3 MB	150	{
	151	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	152	int val;
	153
	154	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
	155	if (val < 0)
	156	return val;
	157
d9f0f287	158	return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
69dc16c3 MB	159	}
69dc16c3 MB	160
9f29c9e3 MB	161	static int wm8994_ldo2_set_voltage_sel(struct regulator_dev *rdev,
9f29c9e3 MB	162	unsigned selector)
69dc16c3 MB	163	{
69dc16c3 MB	164	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
69dc16c3 MB	165
	166	selector <<= WM8994_LDO2_VSEL_SHIFT;
	167
	168	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
	169	WM8994_LDO2_VSEL_MASK, selector);
	170	}
	171
	172	static struct regulator_ops wm8994_ldo2_ops = {
	173	.enable = wm8994_ldo_enable,
	174	.disable = wm8994_ldo_disable,
	175	.is_enabled = wm8994_ldo_is_enabled,
	176	.enable_time = wm8994_ldo_enable_time,
	177
	178	.list_voltage = wm8994_ldo2_list_voltage,
d9f0f287	179	.get_voltage_sel = wm8994_ldo2_get_voltage_sel,
9f29c9e3	180	.set_voltage_sel = wm8994_ldo2_set_voltage_sel,
69dc16c3 MB	181	};
69dc16c3 MB	182
25e4d602	183	static const struct regulator_desc wm8994_ldo_desc[] = {
69dc16c3 MB	184	{
	185	.name = "LDO1",
	186	.id = 1,
	187	.type = REGULATOR_VOLTAGE,
	188	.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
	189	.ops = &wm8994_ldo1_ops,
	190	.owner = THIS_MODULE,
	191	},
	192	{
	193	.name = "LDO2",
	194	.id = 2,
	195	.type = REGULATOR_VOLTAGE,
	196	.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
	197	.ops = &wm8994_ldo2_ops,
	198	.owner = THIS_MODULE,
	199	},
	200	};
	201
	202	static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
	203	{
	204	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	205	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	206	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
c172708d	207	struct regulator_config config = { };
69dc16c3 MB	208	struct wm8994_ldo *ldo;
	209	int ret;
	210
	211	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
	212
	213	if (!pdata)
	214	return -ENODEV;
	215
b9e0348f	216	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
69dc16c3 MB	217	if (ldo == NULL) {
	218	dev_err(&pdev->dev, "Unable to allocate private data\n");
	219	return -ENOMEM;
	220	}
	221
	222	ldo->wm8994 = wm8994;
	223
69dc16c3 MB	224	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
	225	ldo->enable = pdata->ldo[id].enable;
	226
09e3fd20	227	ret = gpio_request_one(ldo->enable, 0, "WM8994 LDO enable");
69dc16c3 MB	228	if (ret < 0) {
	229	dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
	230	ret);
	231	goto err;
	232	}
c4604e49 JS	233	} else
c4604e49 JS	234	ldo->is_enabled = true;
69dc16c3	235
c172708d MB	236	config.dev = &pdev->dev;
	237	config.init_data = pdata->ldo[id].init_data;
	238	config.driver_data = ldo;
	239
	240	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &config);
69dc16c3 MB	241	if (IS_ERR(ldo->regulator)) {
	242	ret = PTR_ERR(ldo->regulator);
	243	dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
	244	id + 1, ret);
	245	goto err_gpio;
	246	}
	247
	248	platform_set_drvdata(pdev, ldo);
	249
	250	return 0;
	251
	252	err_gpio:
	253	if (gpio_is_valid(ldo->enable))
	254	gpio_free(ldo->enable);
	255	err:
69dc16c3 MB	256	return ret;
	257	}
	258
	259	static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
	260	{
	261	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
	262
598b3578 DT	263	platform_set_drvdata(pdev, NULL);
598b3578 DT	264
69dc16c3 MB	265	regulator_unregister(ldo->regulator);
	266	if (gpio_is_valid(ldo->enable))
	267	gpio_free(ldo->enable);
69dc16c3 MB	268
	269	return 0;
	270	}
	271
	272	static struct platform_driver wm8994_ldo_driver = {
	273	.probe = wm8994_ldo_probe,
	274	.remove = __devexit_p(wm8994_ldo_remove),
	275	.driver = {
	276	.name = "wm8994-ldo",
598b3578	277	.owner = THIS_MODULE,
69dc16c3 MB	278	},
	279	};
	280
	281	static int __init wm8994_ldo_init(void)
	282	{
	283	int ret;
	284
	285	ret = platform_driver_register(&wm8994_ldo_driver);
	286	if (ret != 0)
	287	pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
	288
	289	return ret;
	290	}
	291	subsys_initcall(wm8994_ldo_init);
	292
	293	static void __exit wm8994_ldo_exit(void)
	294	{
	295	platform_driver_unregister(&wm8994_ldo_driver);
	296	}
	297	module_exit(wm8994_ldo_exit);
	298
	299	/* Module information */
	300	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	301	MODULE_DESCRIPTION("WM8994 LDO driver");
	302	MODULE_LICENSE("GPL");
	303	MODULE_ALIAS("platform:wm8994-ldo");