[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(struct regulator_dev *rdev,
				   int min_uV, int max_uV, unsigned *s)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int selector, v;

	selector = (min_uV - 2400000) / 100000;
	v = wm8994_ldo1_list_voltage(rdev, selector);
	if (v < 0 || v > max_uV)
		return -EINVAL;

	*s = selector;
	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 = wm8994_ldo1_set_voltage,
};

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;
	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(struct regulator_dev *rdev,
				   int min_uV, int max_uV, unsigned *s)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int selector, v;

	switch (ldo->wm8994->type) {
	case WM8994:
		selector = (min_uV - 900000) / 100000;
		break;
	case WM8958:
		selector = (min_uV - 1000000) / 100000;
		break;
	default:
		return -EINVAL;
	}

	v = wm8994_ldo2_list_voltage(rdev, selector);
	if (v < 0 || v > max_uV)
		return -EINVAL;

	*s = selector;
	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 = wm8994_ldo2_set_voltage,
};

static 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 wm8994_ldo *ldo;
	int ret;

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

	if (!pdata)
		return -ENODEV;

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

		ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
		if (ret < 0) {
			dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
				ret);
			goto err_gpio;
		}
	} else
		ldo->is_enabled = true;

	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
					     pdata->ldo[id].init_data, ldo);
	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:
	kfree(ldo);
	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);
	kfree(ldo);

	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	}
	100
	101	static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
3a93f2a9	102	int min_uV, int max_uV, unsigned *s)
69dc16c3 MB	103	{
	104	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	105	int selector, v;
	106
	107	selector = (min_uV - 2400000) / 100000;
	108	v = wm8994_ldo1_list_voltage(rdev, selector);
	109	if (v < 0 \|\| v > max_uV)
	110	return -EINVAL;
	111
3a93f2a9	112	*s = selector;
69dc16c3 MB	113	selector <<= WM8994_LDO1_VSEL_SHIFT;
	114
	115	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
	116	WM8994_LDO1_VSEL_MASK, selector);
	117	}
	118
	119	static struct regulator_ops wm8994_ldo1_ops = {
	120	.enable = wm8994_ldo_enable,
	121	.disable = wm8994_ldo_disable,
	122	.is_enabled = wm8994_ldo_is_enabled,
	123	.enable_time = wm8994_ldo_enable_time,
	124
	125	.list_voltage = wm8994_ldo1_list_voltage,
d9f0f287	126	.get_voltage_sel = wm8994_ldo1_get_voltage_sel,
69dc16c3 MB	127	.set_voltage = wm8994_ldo1_set_voltage,
	128	};
	129
	130	static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
	131	unsigned int selector)
	132	{
5a7743ed MB	133	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
5a7743ed MB	134
69dc16c3 MB	135	if (selector > WM8994_LDO2_MAX_SELECTOR)
	136	return -EINVAL;
	137
5a7743ed MB	138	switch (ldo->wm8994->type) {
	139	case WM8994:
	140	return (selector * 100000) + 900000;
	141	case WM8958:
	142	return (selector * 100000) + 1000000;
	143	default:
	144	return -EINVAL;
	145	}
69dc16c3 MB	146	}
69dc16c3 MB	147
d9f0f287	148	static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
69dc16c3 MB	149	{
	150	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	151	int val;
	152
	153	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
	154	if (val < 0)
	155	return val;
	156
d9f0f287	157	return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
69dc16c3 MB	158	}
	159
	160	static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
3a93f2a9	161	int min_uV, int max_uV, unsigned *s)
69dc16c3 MB	162	{
	163	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	164	int selector, v;
	165
5a7743ed MB	166	switch (ldo->wm8994->type) {
	167	case WM8994:
	168	selector = (min_uV - 900000) / 100000;
	169	break;
	170	case WM8958:
	171	selector = (min_uV - 1000000) / 100000;
	172	break;
	173	default:
	174	return -EINVAL;
	175	}
	176
69dc16c3 MB	177	v = wm8994_ldo2_list_voltage(rdev, selector);
	178	if (v < 0 \|\| v > max_uV)
	179	return -EINVAL;
	180
3a93f2a9	181	*s = selector;
69dc16c3 MB	182	selector <<= WM8994_LDO2_VSEL_SHIFT;
	183
	184	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
	185	WM8994_LDO2_VSEL_MASK, selector);
	186	}
	187
	188	static struct regulator_ops wm8994_ldo2_ops = {
	189	.enable = wm8994_ldo_enable,
	190	.disable = wm8994_ldo_disable,
	191	.is_enabled = wm8994_ldo_is_enabled,
	192	.enable_time = wm8994_ldo_enable_time,
	193
	194	.list_voltage = wm8994_ldo2_list_voltage,
d9f0f287	195	.get_voltage_sel = wm8994_ldo2_get_voltage_sel,
69dc16c3 MB	196	.set_voltage = wm8994_ldo2_set_voltage,
	197	};
	198
	199	static struct regulator_desc wm8994_ldo_desc[] = {
	200	{
	201	.name = "LDO1",
	202	.id = 1,
	203	.type = REGULATOR_VOLTAGE,
	204	.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
	205	.ops = &wm8994_ldo1_ops,
	206	.owner = THIS_MODULE,
	207	},
	208	{
	209	.name = "LDO2",
	210	.id = 2,
	211	.type = REGULATOR_VOLTAGE,
	212	.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
	213	.ops = &wm8994_ldo2_ops,
	214	.owner = THIS_MODULE,
	215	},
	216	};
	217
	218	static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
	219	{
	220	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	221	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	222	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
	223	struct wm8994_ldo *ldo;
	224	int ret;
	225
	226	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
	227
	228	if (!pdata)
	229	return -ENODEV;
	230
	231	ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
	232	if (ldo == NULL) {
	233	dev_err(&pdev->dev, "Unable to allocate private data\n");
	234	return -ENOMEM;
	235	}
	236
	237	ldo->wm8994 = wm8994;
	238
69dc16c3 MB	239	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
	240	ldo->enable = pdata->ldo[id].enable;
	241
	242	ret = gpio_request(ldo->enable, "WM8994 LDO enable");
	243	if (ret < 0) {
	244	dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
	245	ret);
	246	goto err;
	247	}
	248
	249	ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
	250	if (ret < 0) {
	251	dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
	252	ret);
	253	goto err_gpio;
	254	}
c4604e49 JS	255	} else
c4604e49 JS	256	ldo->is_enabled = true;
69dc16c3 MB	257
	258	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
	259	pdata->ldo[id].init_data, ldo);
	260	if (IS_ERR(ldo->regulator)) {
	261	ret = PTR_ERR(ldo->regulator);
	262	dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
	263	id + 1, ret);
	264	goto err_gpio;
	265	}
	266
	267	platform_set_drvdata(pdev, ldo);
	268
	269	return 0;
	270
	271	err_gpio:
	272	if (gpio_is_valid(ldo->enable))
	273	gpio_free(ldo->enable);
	274	err:
	275	kfree(ldo);
	276	return ret;
	277	}
	278
	279	static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
	280	{
	281	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
	282
598b3578 DT	283	platform_set_drvdata(pdev, NULL);
598b3578 DT	284
69dc16c3 MB	285	regulator_unregister(ldo->regulator);
	286	if (gpio_is_valid(ldo->enable))
	287	gpio_free(ldo->enable);
	288	kfree(ldo);
	289
	290	return 0;
	291	}
	292
	293	static struct platform_driver wm8994_ldo_driver = {
	294	.probe = wm8994_ldo_probe,
	295	.remove = __devexit_p(wm8994_ldo_remove),
	296	.driver = {
	297	.name = "wm8994-ldo",
598b3578	298	.owner = THIS_MODULE,
69dc16c3 MB	299	},
	300	};
	301
	302	static int __init wm8994_ldo_init(void)
	303	{
	304	int ret;
	305
	306	ret = platform_driver_register(&wm8994_ldo_driver);
	307	if (ret != 0)
	308	pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
	309
	310	return ret;
	311	}
	312	subsys_initcall(wm8994_ldo_init);
	313
	314	static void __exit wm8994_ldo_exit(void)
	315	{
	316	platform_driver_unregister(&wm8994_ldo_driver);
	317	}
	318	module_exit(wm8994_ldo_exit);
	319
	320	/* Module information */
	321	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	322	MODULE_DESCRIPTION("WM8994 LDO driver");
	323	MODULE_LICENSE("GPL");
	324	MODULE_ALIAS("platform:wm8994-ldo");