[linux-2.6-block.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/regulator/machine.h>
#include <linux/gpio/consumer.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 {
	struct regulator_dev *regulator;
	struct wm8994 *wm8994;
	struct regulator_consumer_supply supply;
	struct regulator_init_data init_data;
};

#define WM8994_LDO1_MAX_SELECTOR 0x7
#define WM8994_LDO2_MAX_SELECTOR 0x3

static const struct regulator_ops wm8994_ldo1_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.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 const struct regulator_ops wm8994_ldo2_ops = {
	.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,
		.min_uV = 2400000,
		.uV_step = 100000,
		.enable_time = 3000,
		.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,
		.enable_time = 3000,
		.owner = THIS_MODULE,
	},
};

static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
	{ .supply = "AVDD1" },
	{ .supply = "DCVDD" },
};

static const struct regulator_init_data wm8994_ldo_default[] = {
	{
		.constraints = {
			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
		},
		.num_consumer_supplies = 1,
	},
	{
		.constraints = {
			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
		},
		.num_consumer_supplies = 1,
	},
};

static int wm8994_ldo_probe(struct platform_device *pdev)
{
	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
	struct regulator_config config = { };
	struct wm8994_ldo *ldo;
	struct gpio_desc *gpiod;
	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)
		return -ENOMEM;

	ldo->wm8994 = wm8994;
	ldo->supply = wm8994_ldo_consumer[id];
	ldo->supply.dev_name = dev_name(wm8994->dev);

	config.dev = wm8994->dev;
	config.driver_data = ldo;
	config.regmap = wm8994->regmap;
	config.init_data = &ldo->init_data;

	/*
	 * Look up LDO enable GPIO from the parent device node, we don't
	 * use devm because the regulator core will free the GPIO
	 */
	gpiod = gpiod_get_optional(pdev->dev.parent,
				   id ? "wlf,ldo2ena" : "wlf,ldo1ena",
				   GPIOD_OUT_LOW |
				   GPIOD_FLAGS_BIT_NONEXCLUSIVE);
	if (IS_ERR(gpiod))
		return PTR_ERR(gpiod);
	config.ena_gpiod = gpiod;

	/* Use default constraints if none set up */
	if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
		dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
			ldo->supply.dev_name, ldo->supply.supply);

		ldo->init_data = wm8994_ldo_default[id];
		ldo->init_data.consumer_supplies = &ldo->supply;
		if (!gpiod)
			ldo->init_data.constraints.valid_ops_mask = 0;
	} else {
		ldo->init_data = *pdata->ldo[id].init_data;
	}

	/*
	 * At this point the GPIO descriptor is handled over to the
	 * regulator core and we need not worry about it on the
	 * error path.
	 */
	ldo->regulator = devm_regulator_register(&pdev->dev,
						 &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);
		return ret;
	}

	platform_set_drvdata(pdev, ldo);

	return 0;
}

static struct platform_driver wm8994_ldo_driver = {
	.probe = wm8994_ldo_probe,
	.driver		= {
		.name	= "wm8994-ldo",
	},
};

module_platform_driver(wm8994_ldo_driver);

/* 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>
e3d27775	21	#include <linux/regulator/machine.h>
1d2f4681	22	#include <linux/gpio/consumer.h>
5a0e3ad6	23	#include <linux/slab.h>
69dc16c3 MB	24
	25	#include <linux/mfd/wm8994/core.h>
	26	#include <linux/mfd/wm8994/registers.h>
	27	#include <linux/mfd/wm8994/pdata.h>
	28
	29	struct wm8994_ldo {
69dc16c3 MB	30	struct regulator_dev *regulator;
69dc16c3 MB	31	struct wm8994 *wm8994;
e3d27775 MB	32	struct regulator_consumer_supply supply;
e3d27775 MB	33	struct regulator_init_data init_data;
69dc16c3 MB	34	};
	35
	36	#define WM8994_LDO1_MAX_SELECTOR 0x7
	37	#define WM8994_LDO2_MAX_SELECTOR 0x3
	38
b0d6dd3b	39	static const struct regulator_ops wm8994_ldo1_ops = {
f2d103ad AL	40	.list_voltage = regulator_list_voltage_linear,
f2d103ad AL	41	.map_voltage = regulator_map_voltage_linear,
633b6fcd MB	42	.get_voltage_sel = regulator_get_voltage_sel_regmap,
633b6fcd MB	43	.set_voltage_sel = regulator_set_voltage_sel_regmap,
69dc16c3 MB	44	};
	45
	46	static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
	47	unsigned int selector)
	48	{
5a7743ed MB	49	struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
5a7743ed MB	50
69dc16c3 MB	51	if (selector > WM8994_LDO2_MAX_SELECTOR)
	52	return -EINVAL;
	53
5a7743ed MB	54	switch (ldo->wm8994->type) {
	55	case WM8994:
	56	return (selector * 100000) + 900000;
	57	case WM8958:
	58	return (selector * 100000) + 1000000;
a1ff89ef MB	59	case WM1811:
	60	switch (selector) {
	61	case 0:
	62	return -EINVAL;
	63	default:
	64	return (selector * 100000) + 950000;
	65	}
	66	break;
5a7743ed MB	67	default:
	68	return -EINVAL;
	69	}
69dc16c3 MB	70	}
69dc16c3 MB	71
b0d6dd3b	72	static const struct regulator_ops wm8994_ldo2_ops = {
69dc16c3	73	.list_voltage = wm8994_ldo2_list_voltage,
633b6fcd MB	74	.get_voltage_sel = regulator_get_voltage_sel_regmap,
633b6fcd MB	75	.set_voltage_sel = regulator_set_voltage_sel_regmap,
69dc16c3 MB	76	};
69dc16c3 MB	77
25e4d602	78	static const struct regulator_desc wm8994_ldo_desc[] = {
69dc16c3 MB	79	{
	80	.name = "LDO1",
	81	.id = 1,
	82	.type = REGULATOR_VOLTAGE,
	83	.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
633b6fcd MB	84	.vsel_reg = WM8994_LDO_1,
633b6fcd MB	85	.vsel_mask = WM8994_LDO1_VSEL_MASK,
69dc16c3	86	.ops = &wm8994_ldo1_ops,
f2d103ad AL	87	.min_uV = 2400000,
f2d103ad AL	88	.uV_step = 100000,
00581b30	89	.enable_time = 3000,
69dc16c3 MB	90	.owner = THIS_MODULE,
	91	},
	92	{
	93	.name = "LDO2",
	94	.id = 2,
	95	.type = REGULATOR_VOLTAGE,
	96	.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
633b6fcd MB	97	.vsel_reg = WM8994_LDO_2,
633b6fcd MB	98	.vsel_mask = WM8994_LDO2_VSEL_MASK,
69dc16c3	99	.ops = &wm8994_ldo2_ops,
00581b30	100	.enable_time = 3000,
69dc16c3 MB	101	.owner = THIS_MODULE,
	102	},
	103	};
	104
e3d27775 MB	105	static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
	106	{ .supply = "AVDD1" },
	107	{ .supply = "DCVDD" },
	108	};
	109
	110	static const struct regulator_init_data wm8994_ldo_default[] = {
	111	{
	112	.constraints = {
	113	.valid_ops_mask = REGULATOR_CHANGE_STATUS,
	114	},
	115	.num_consumer_supplies = 1,
	116	},
	117	{
	118	.constraints = {
	119	.valid_ops_mask = REGULATOR_CHANGE_STATUS,
	120	},
	121	.num_consumer_supplies = 1,
	122	},
	123	};
	124
a5023574	125	static int wm8994_ldo_probe(struct platform_device *pdev)
69dc16c3 MB	126	{
69dc16c3 MB	127	struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
dff91d0b	128	struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
69dc16c3	129	int id = pdev->id % ARRAY_SIZE(pdata->ldo);
c172708d	130	struct regulator_config config = { };
69dc16c3	131	struct wm8994_ldo *ldo;
1d2f4681	132	struct gpio_desc *gpiod;
69dc16c3 MB	133	int ret;
	134
	135	dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
	136
b9e0348f	137	ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
4deaf85a	138	if (!ldo)
69dc16c3	139	return -ENOMEM;
69dc16c3 MB	140
69dc16c3 MB	141	ldo->wm8994 = wm8994;
e3d27775 MB	142	ldo->supply = wm8994_ldo_consumer[id];
e3d27775 MB	143	ldo->supply.dev_name = dev_name(wm8994->dev);
69dc16c3	144
5d0526ea	145	config.dev = wm8994->dev;
c172708d	146	config.driver_data = ldo;
633b6fcd	147	config.regmap = wm8994->regmap;
e3d27775	148	config.init_data = &ldo->init_data;
1d2f4681	149
466affa0 CK	150	/*
	151	* Look up LDO enable GPIO from the parent device node, we don't
	152	* use devm because the regulator core will free the GPIO
	153	*/
	154	gpiod = gpiod_get_optional(pdev->dev.parent,
	155	id ? "wlf,ldo2ena" : "wlf,ldo1ena",
	156	GPIOD_OUT_LOW \|
	157	GPIOD_FLAGS_BIT_NONEXCLUSIVE);
1d2f4681 LW	158	if (IS_ERR(gpiod))
	159	return PTR_ERR(gpiod);
	160	config.ena_gpiod = gpiod;
e3d27775 MB	161
e3d27775 MB	162	/* Use default constraints if none set up */
3ea93896	163	if (!pdata \|\| !pdata->ldo[id].init_data \|\| wm8994->dev->of_node) {
e3d27775 MB	164	dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
	165	ldo->supply.dev_name, ldo->supply.supply);
	166
	167	ldo->init_data = wm8994_ldo_default[id];
	168	ldo->init_data.consumer_supplies = &ldo->supply;
1d2f4681	169	if (!gpiod)
e3d27775 MB	170	ldo->init_data.constraints.valid_ops_mask = 0;
	171	} else {
	172	ldo->init_data = *pdata->ldo[id].init_data;
495fd8c8	173	}
c172708d	174
daa531db LW	175	/*
	176	* At this point the GPIO descriptor is handled over to the
	177	* regulator core and we need not worry about it on the
	178	* error path.
	179	*/
9e2bfbbd MB	180	ldo->regulator = devm_regulator_register(&pdev->dev,
	181	&wm8994_ldo_desc[id],
	182	&config);
69dc16c3 MB	183	if (IS_ERR(ldo->regulator)) {
	184	ret = PTR_ERR(ldo->regulator);
	185	dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
	186	id + 1, ret);
daa531db	187	return ret;
69dc16c3 MB	188	}
	189
	190	platform_set_drvdata(pdev, ldo);
	191
	192	return 0;
69dc16c3 MB	193	}
69dc16c3 MB	194
69dc16c3 MB	195	static struct platform_driver wm8994_ldo_driver = {
69dc16c3 MB	196	.probe = wm8994_ldo_probe,
69dc16c3 MB	197	.driver = {
	198	.name = "wm8994-ldo",
	199	},
	200	};
	201
05650216	202	module_platform_driver(wm8994_ldo_driver);
69dc16c3 MB	203
	204	/* Module information */
	205	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	206	MODULE_DESCRIPTION("WM8994 LDO driver");
	207	MODULE_LICENSE("GPL");
	208	MODULE_ALIAS("platform:wm8994-ldo");