[GitHub/mt8127/android_kernel_alcatel_ttab.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;
	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(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;
	case WM1811:
		selector = (min_uV - 950000) / 100000;
		if (selector == 0)
			selector = 1;
		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 = 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(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, NULL);
	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	}
	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;
a1ff89ef MB	143	case WM1811:
	144	switch (selector) {
	145	case 0:
	146	return -EINVAL;
	147	default:
	148	return (selector * 100000) + 950000;
	149	}
	150	break;
5a7743ed MB	151	default:
	152	return -EINVAL;
	153	}
69dc16c3 MB	154	}
69dc16c3 MB	155
d9f0f287	156	static int wm8994_ldo2_get_voltage_sel(struct regulator_dev *rdev)
69dc16c3 MB	157	{
	158	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	159	int val;
	160
	161	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
	162	if (val < 0)
	163	return val;
	164
d9f0f287	165	return (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
69dc16c3 MB	166	}
	167
	168	static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
3a93f2a9	169	int min_uV, int max_uV, unsigned *s)
69dc16c3 MB	170	{
	171	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	172	int selector, v;
	173
5a7743ed MB	174	switch (ldo->wm8994->type) {
	175	case WM8994:
	176	selector = (min_uV - 900000) / 100000;
	177	break;
	178	case WM8958:
	179	selector = (min_uV - 1000000) / 100000;
	180	break;
a1ff89ef MB	181	case WM1811:
	182	selector = (min_uV - 950000) / 100000;
	183	if (selector == 0)
	184	selector = 1;
	185	break;
5a7743ed MB	186	default:
	187	return -EINVAL;
	188	}
	189
69dc16c3 MB	190	v = wm8994_ldo2_list_voltage(rdev, selector);
	191	if (v < 0 \|\| v > max_uV)
	192	return -EINVAL;
	193
3a93f2a9	194	*s = selector;
69dc16c3 MB	195	selector <<= WM8994_LDO2_VSEL_SHIFT;
	196
	197	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
	198	WM8994_LDO2_VSEL_MASK, selector);
	199	}
	200
	201	static struct regulator_ops wm8994_ldo2_ops = {
	202	.enable = wm8994_ldo_enable,
	203	.disable = wm8994_ldo_disable,
	204	.is_enabled = wm8994_ldo_is_enabled,
	205	.enable_time = wm8994_ldo_enable_time,
	206
	207	.list_voltage = wm8994_ldo2_list_voltage,
d9f0f287	208	.get_voltage_sel = wm8994_ldo2_get_voltage_sel,
69dc16c3 MB	209	.set_voltage = wm8994_ldo2_set_voltage,
	210	};
	211
	212	static struct regulator_desc wm8994_ldo_desc[] = {
	213	{
	214	.name = "LDO1",
	215	.id = 1,
	216	.type = REGULATOR_VOLTAGE,
	217	.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
	218	.ops = &wm8994_ldo1_ops,
	219	.owner = THIS_MODULE,
	220	},
	221	{
	222	.name = "LDO2",
	223	.id = 2,
	224	.type = REGULATOR_VOLTAGE,
	225	.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
	226	.ops = &wm8994_ldo2_ops,
	227	.owner = THIS_MODULE,
	228	},
	229	};
	230
	231	static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
	232	{
	233	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	234	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
	235	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
	236	struct wm8994_ldo *ldo;
	237	int ret;
	238
	239	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
	240
	241	if (!pdata)
	242	return -ENODEV;
	243
b9e0348f	244	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
69dc16c3 MB	245	if (ldo == NULL) {
	246	dev_err(&pdev->dev, "Unable to allocate private data\n");
	247	return -ENOMEM;
	248	}
	249
	250	ldo->wm8994 = wm8994;
	251
69dc16c3 MB	252	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
	253	ldo->enable = pdata->ldo[id].enable;
	254
	255	ret = gpio_request(ldo->enable, "WM8994 LDO enable");
	256	if (ret < 0) {
	257	dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
	258	ret);
	259	goto err;
	260	}
	261
	262	ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
	263	if (ret < 0) {
	264	dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
	265	ret);
	266	goto err_gpio;
	267	}
c4604e49 JS	268	} else
c4604e49 JS	269	ldo->is_enabled = true;
69dc16c3 MB	270
69dc16c3 MB	271	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
2c043bcb	272	pdata->ldo[id].init_data, ldo, NULL);
69dc16c3 MB	273	if (IS_ERR(ldo->regulator)) {
	274	ret = PTR_ERR(ldo->regulator);
	275	dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
	276	id + 1, ret);
	277	goto err_gpio;
	278	}
	279
	280	platform_set_drvdata(pdev, ldo);
	281
	282	return 0;
	283
	284	err_gpio:
	285	if (gpio_is_valid(ldo->enable))
	286	gpio_free(ldo->enable);
	287	err:
69dc16c3 MB	288	return ret;
	289	}
	290
	291	static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
	292	{
	293	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
	294
598b3578 DT	295	platform_set_drvdata(pdev, NULL);
598b3578 DT	296
69dc16c3 MB	297	regulator_unregister(ldo->regulator);
	298	if (gpio_is_valid(ldo->enable))
	299	gpio_free(ldo->enable);
69dc16c3 MB	300
	301	return 0;
	302	}
	303
	304	static struct platform_driver wm8994_ldo_driver = {
	305	.probe = wm8994_ldo_probe,
	306	.remove = __devexit_p(wm8994_ldo_remove),
	307	.driver = {
	308	.name = "wm8994-ldo",
598b3578	309	.owner = THIS_MODULE,
69dc16c3 MB	310	},
	311	};
	312
	313	static int __init wm8994_ldo_init(void)
	314	{
	315	int ret;
	316
	317	ret = platform_driver_register(&wm8994_ldo_driver);
	318	if (ret != 0)
	319	pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
	320
	321	return ret;
	322	}
	323	subsys_initcall(wm8994_ldo_init);
	324
	325	static void __exit wm8994_ldo_exit(void)
	326	{
	327	platform_driver_unregister(&wm8994_ldo_driver);
	328	}
	329	module_exit(wm8994_ldo_exit);
	330
	331	/* Module information */
	332	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	333	MODULE_DESCRIPTION("WM8994 LDO driver");
	334	MODULE_LICENSE("GPL");
	335	MODULE_ALIAS("platform:wm8994-ldo");