[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(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(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(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;

	val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;

	return wm8994_ldo1_list_voltage(rdev, val);
}

static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
				   int min_uV, int max_uV)
{
	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;

	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 = wm8994_ldo1_get_voltage,
	.set_voltage = wm8994_ldo1_set_voltage,
};

static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
				    unsigned int selector)
{
	if (selector > WM8994_LDO2_MAX_SELECTOR)
		return -EINVAL;

	return (selector * 100000) + 900000;
}

static int wm8994_ldo2_get_voltage(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;

	val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;

	return wm8994_ldo2_list_voltage(rdev, val);
}

static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
				   int min_uV, int max_uV)
{
	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	int selector, v;

	selector = (min_uV - 900000) / 100000;
	v = wm8994_ldo2_list_voltage(rdev, selector);
	if (v < 0 || v > max_uV)
		return -EINVAL;

	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 = wm8994_ldo2_get_voltage,
	.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;

	ldo->is_enabled = true;

	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;
		}
	}

	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
	46	gpio_set_value(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
	60	gpio_set_value(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
	89	static int wm8994_ldo1_get_voltage(struct regulator_dev *rdev)
	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
	98	val = (val & WM8994_LDO1_VSEL_MASK) >> WM8994_LDO1_VSEL_SHIFT;
	99
	100	return wm8994_ldo1_list_voltage(rdev, val);
	101	}
	102
	103	static int wm8994_ldo1_set_voltage(struct regulator_dev *rdev,
	104	int min_uV, int max_uV)
	105	{
	106	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
	107	int selector, v;
	108
	109	selector = (min_uV - 2400000) / 100000;
	110	v = wm8994_ldo1_list_voltage(rdev, selector);
	111	if (v < 0 \|\| v > max_uV)
	112	return -EINVAL;
	113
	114	selector <<= WM8994_LDO1_VSEL_SHIFT;
	115
	116	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_1,
	117	WM8994_LDO1_VSEL_MASK, selector);
	118	}
	119
	120	static struct regulator_ops wm8994_ldo1_ops = {
	121	.enable = wm8994_ldo_enable,
	122	.disable = wm8994_ldo_disable,
	123	.is_enabled = wm8994_ldo_is_enabled,
	124	.enable_time = wm8994_ldo_enable_time,
	125
126	.list_voltage = wm8994_ldo1_list_voltage,
127	.get_voltage = wm8994_ldo1_get_voltage,
128	.set_voltage = wm8994_ldo1_set_voltage,
129	};
130
131	static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
132	unsigned int selector)
133	{
134	if (selector > WM8994_LDO2_MAX_SELECTOR)
135	return -EINVAL;
136
137	return (selector * 100000) + 900000;
138	}
139
140	static int wm8994_ldo2_get_voltage(struct regulator_dev *rdev)
141	{
142	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
143	int val;
144
145	val = wm8994_reg_read(ldo->wm8994, WM8994_LDO_2);
146	if (val < 0)
147	return val;
148
149	val = (val & WM8994_LDO2_VSEL_MASK) >> WM8994_LDO2_VSEL_SHIFT;
150
151	return wm8994_ldo2_list_voltage(rdev, val);
152	}
153
154	static int wm8994_ldo2_set_voltage(struct regulator_dev *rdev,
155	int min_uV, int max_uV)
156	{
157	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
158	int selector, v;
159
160	selector = (min_uV - 900000) / 100000;
161	v = wm8994_ldo2_list_voltage(rdev, selector);
162	if (v < 0 \|\| v > max_uV)
163	return -EINVAL;
164
165	selector <<= WM8994_LDO2_VSEL_SHIFT;
166
167	return wm8994_set_bits(ldo->wm8994, WM8994_LDO_2,
168	WM8994_LDO2_VSEL_MASK, selector);
169	}
170
171	static struct regulator_ops wm8994_ldo2_ops = {
172	.enable = wm8994_ldo_enable,
173	.disable = wm8994_ldo_disable,
174	.is_enabled = wm8994_ldo_is_enabled,
175	.enable_time = wm8994_ldo_enable_time,
176
177	.list_voltage = wm8994_ldo2_list_voltage,
178	.get_voltage = wm8994_ldo2_get_voltage,
179	.set_voltage = wm8994_ldo2_set_voltage,
180	};
181
182	static struct regulator_desc wm8994_ldo_desc[] = {
183	{
184	.name = "LDO1",
185	.id = 1,
186	.type = REGULATOR_VOLTAGE,
187	.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
188	.ops = &wm8994_ldo1_ops,
189	.owner = THIS_MODULE,
190	},
191	{
192	.name = "LDO2",
193	.id = 2,
194	.type = REGULATOR_VOLTAGE,
195	.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
196	.ops = &wm8994_ldo2_ops,
197	.owner = THIS_MODULE,
198	},
199	};
200
201	static __devinit int wm8994_ldo_probe(struct platform_device *pdev)
202	{
203	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
204	struct wm8994_pdata *pdata = wm8994->dev->platform_data;
205	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
206	struct wm8994_ldo *ldo;
207	int ret;
208
209	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
210
211	if (!pdata)
212	return -ENODEV;
213
214	ldo = kzalloc(sizeof(struct wm8994_ldo), GFP_KERNEL);
215	if (ldo == NULL) {
216	dev_err(&pdev->dev, "Unable to allocate private data\n");
217	return -ENOMEM;
218	}
219
220	ldo->wm8994 = wm8994;
221
598b3578	222	ldo->is_enabled = true;
69dc16c3 MB	223
	224	if (pdata->ldo[id].enable && gpio_is_valid(pdata->ldo[id].enable)) {
	225	ldo->enable = pdata->ldo[id].enable;
	226
	227	ret = gpio_request(ldo->enable, "WM8994 LDO enable");
	228	if (ret < 0) {
	229	dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n",
	230	ret);
	231	goto err;
	232	}
	233
	234	ret = gpio_direction_output(ldo->enable, ldo->is_enabled);
	235	if (ret < 0) {
	236	dev_err(&pdev->dev, "Failed to set GPIO up: %d\n",
	237	ret);
	238	goto err_gpio;
	239	}
	240	}
	241
	242	ldo->regulator = regulator_register(&wm8994_ldo_desc[id], &pdev->dev,
	243	pdata->ldo[id].init_data, ldo);
	244	if (IS_ERR(ldo->regulator)) {
	245	ret = PTR_ERR(ldo->regulator);
	246	dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
	247	id + 1, ret);
	248	goto err_gpio;
	249	}
	250
	251	platform_set_drvdata(pdev, ldo);
	252
	253	return 0;
	254
	255	err_gpio:
	256	if (gpio_is_valid(ldo->enable))
	257	gpio_free(ldo->enable);
	258	err:
	259	kfree(ldo);
	260	return ret;
	261	}
	262
	263	static __devexit int wm8994_ldo_remove(struct platform_device *pdev)
	264	{
	265	struct wm8994_ldo *ldo = platform_get_drvdata(pdev);
	266
598b3578 DT	267	platform_set_drvdata(pdev, NULL);
598b3578 DT	268
69dc16c3 MB	269	regulator_unregister(ldo->regulator);
	270	if (gpio_is_valid(ldo->enable))
	271	gpio_free(ldo->enable);
	272	kfree(ldo);
	273
	274	return 0;
	275	}
	276
	277	static struct platform_driver wm8994_ldo_driver = {
	278	.probe = wm8994_ldo_probe,
	279	.remove = __devexit_p(wm8994_ldo_remove),
	280	.driver = {
	281	.name = "wm8994-ldo",
598b3578	282	.owner = THIS_MODULE,
69dc16c3 MB	283	},
	284	};
	285
	286	static int __init wm8994_ldo_init(void)
	287	{
	288	int ret;
	289
	290	ret = platform_driver_register(&wm8994_ldo_driver);
	291	if (ret != 0)
	292	pr_err("Failed to register Wm8994 GP LDO driver: %d\n", ret);
	293
	294	return ret;
	295	}
	296	subsys_initcall(wm8994_ldo_init);
	297
	298	static void __exit wm8994_ldo_exit(void)
	299	{
	300	platform_driver_unregister(&wm8994_ldo_driver);
	301	}
	302	module_exit(wm8994_ldo_exit);
	303
	304	/* Module information */
	305	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	306	MODULE_DESCRIPTION("WM8994 LDO driver");
	307	MODULE_LICENSE("GPL");
	308	MODULE_ALIAS("platform:wm8994-ldo");