[deliverable/linux.git] / drivers / regulator / tps65090-regulator.c

/*
 * Regulator driver for tps65090 power management chip.
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.

 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/tps65090.h>
#include <linux/regulator/tps65090-regulator.h>

struct tps65090_regulator {
	int		id;
	/* Regulator register address.*/
	u8		reg_en_reg;
	u8		en_bit;

	/* used by regulator core */
	struct regulator_desc	desc;

	/* Device */
	struct device		*dev;
};

static inline struct device *to_tps65090_dev(struct regulator_dev *rdev)
{
	return rdev_get_dev(rdev)->parent->parent;
}

static int tps65090_reg_is_enabled(struct regulator_dev *rdev)
{
	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
	struct device *parent = to_tps65090_dev(rdev);
	uint8_t control;
	int ret;

	ret = tps65090_read(parent, ri->reg_en_reg, &control);
	if (ret < 0) {
		dev_err(&rdev->dev, "Error in reading reg 0x%x\n",
			ri->reg_en_reg);
		return ret;
	}
	return (((control >> ri->en_bit) & 1) == 1);
}

static int tps65090_reg_enable(struct regulator_dev *rdev)
{
	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
	struct device *parent = to_tps65090_dev(rdev);
	int ret;

	ret = tps65090_set_bits(parent, ri->reg_en_reg, ri->en_bit);
	if (ret < 0)
		dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
			ri->reg_en_reg);
	return ret;
}

static int tps65090_reg_disable(struct regulator_dev *rdev)
{
	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
	struct device *parent = to_tps65090_dev(rdev);
	int ret;

	ret = tps65090_clr_bits(parent, ri->reg_en_reg, ri->en_bit);
	if (ret < 0)
		dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
			ri->reg_en_reg);

	return ret;
}

static struct regulator_ops tps65090_ops = {
	.enable		= tps65090_reg_enable,
	.disable	= tps65090_reg_disable,
	.is_enabled	= tps65090_reg_is_enabled,
};

#define tps65090_REG(_id)				\
{							\
	.reg_en_reg	= (TPS65090_ID_##_id) + 12,	\
	.en_bit		= 0,				\
	.id		= TPS65090_ID_##_id,		\
	.desc = {					\
		.name = tps65090_rails(_id),		\
		.id = TPS65090_ID_##_id,		\
		.ops = &tps65090_ops,			\
		.type = REGULATOR_VOLTAGE,		\
		.owner = THIS_MODULE,			\
	},						\
}

static struct tps65090_regulator TPS65090_regulator[] = {
	tps65090_REG(DCDC1),
	tps65090_REG(DCDC2),
	tps65090_REG(DCDC3),
	tps65090_REG(FET1),
	tps65090_REG(FET2),
	tps65090_REG(FET3),
	tps65090_REG(FET4),
	tps65090_REG(FET5),
	tps65090_REG(FET6),
	tps65090_REG(FET7),
};

static inline struct tps65090_regulator *find_regulator_info(int id)
{
	struct tps65090_regulator *ri;
	int i;

	for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) {
		ri = &TPS65090_regulator[i];
		if (ri->desc.id == id)
			return ri;
	}
	return NULL;
}

static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
{
	struct tps65090_regulator *ri = NULL;
	struct regulator_dev *rdev;
	struct tps65090_regulator_platform_data *tps_pdata;
	int id = pdev->id;

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

	ri = find_regulator_info(id);
	if (ri == NULL) {
		dev_err(&pdev->dev, "invalid regulator ID specified\n");
		return -EINVAL;
	}
	tps_pdata = pdev->dev.platform_data;
	ri->dev = &pdev->dev;

	rdev = regulator_register(&ri->desc, &pdev->dev,
				&tps_pdata->regulator, ri, NULL);
	if (IS_ERR(rdev)) {
		dev_err(&pdev->dev, "failed to register regulator %s\n",
				ri->desc.name);
		return PTR_ERR(rdev);
	}

	platform_set_drvdata(pdev, rdev);
	return 0;
}

static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	regulator_unregister(rdev);
	return 0;
}

static struct platform_driver tps65090_regulator_driver = {
	.driver	= {
		.name	= "tps65090-regulator",
		.owner	= THIS_MODULE,
	},
	.probe		= tps65090_regulator_probe,
	.remove		= __devexit_p(tps65090_regulator_remove),
};

static int __init tps65090_regulator_init(void)
{
	return platform_driver_register(&tps65090_regulator_driver);
}
subsys_initcall(tps65090_regulator_init);

static void __exit tps65090_regulator_exit(void)
{
	platform_driver_unregister(&tps65090_regulator_driver);
}
module_exit(tps65090_regulator_exit);

MODULE_DESCRIPTION("tps65090 regulator driver");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
452534e5 VB	1	/*
	2	* Regulator driver for tps65090 power management chip.
	3	*
	4	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	5
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms and conditions of the GNU General Public License,
	8	* version 2, as published by the Free Software Foundation.
	9
	10	* This program is distributed in the hope it will be useful, but WITHOUT
	11	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	12	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	13	* more details.
	14
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/delay.h>
	21	#include <linux/init.h>
	22	#include <linux/slab.h>
	23	#include <linux/err.h>
	24	#include <linux/platform_device.h>
	25	#include <linux/regulator/driver.h>
	26	#include <linux/regulator/machine.h>
	27	#include <linux/mfd/tps65090.h>
	28	#include <linux/regulator/tps65090-regulator.h>
	29
	30	struct tps65090_regulator {
	31	int id;
	32	/* Regulator register address.*/
	33	u8 reg_en_reg;
	34	u8 en_bit;
	35
	36	/* used by regulator core */
	37	struct regulator_desc desc;
	38
	39	/* Device */
	40	struct device *dev;
	41	};
	42
	43	static inline struct device to_tps65090_dev(struct regulator_dev rdev)
	44	{
	45	return rdev_get_dev(rdev)->parent->parent;
	46	}
	47
	48	static int tps65090_reg_is_enabled(struct regulator_dev *rdev)
	49	{
	50	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
	51	struct device *parent = to_tps65090_dev(rdev);
	52	uint8_t control;
	53	int ret;
	54
	55	ret = tps65090_read(parent, ri->reg_en_reg, &control);
	56	if (ret < 0) {
	57	dev_err(&rdev->dev, "Error in reading reg 0x%x\n",
	58	ri->reg_en_reg);
	59	return ret;
	60	}
	61	return (((control >> ri->en_bit) & 1) == 1);
	62	}
	63
	64	static int tps65090_reg_enable(struct regulator_dev *rdev)
65	{
66	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
67	struct device *parent = to_tps65090_dev(rdev);
68	int ret;
69
70	ret = tps65090_set_bits(parent, ri->reg_en_reg, ri->en_bit);
71	if (ret < 0)
72	dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
73	ri->reg_en_reg);
74	return ret;
75	}
76
77	static int tps65090_reg_disable(struct regulator_dev *rdev)
78	{
79	struct tps65090_regulator *ri = rdev_get_drvdata(rdev);
80	struct device *parent = to_tps65090_dev(rdev);
81	int ret;
82
83	ret = tps65090_clr_bits(parent, ri->reg_en_reg, ri->en_bit);
84	if (ret < 0)
85	dev_err(&rdev->dev, "Error in updating reg 0x%x\n",
86	ri->reg_en_reg);
87
88	return ret;
89	}
90
91	static struct regulator_ops tps65090_ops = {
92	.enable = tps65090_reg_enable,
93	.disable = tps65090_reg_disable,
94	.is_enabled = tps65090_reg_is_enabled,
95	};
96
4b3bd55f	97	#define tps65090_REG(_id) \
452534e5	98	{ \
4b3bd55f AL	99	.reg_en_reg = (TPS65090_ID_##_id) + 12, \
4b3bd55f AL	100	.en_bit = 0, \
452534e5 VB	101	.id = TPS65090_ID_##_id, \
	102	.desc = { \
	103	.name = tps65090_rails(_id), \
	104	.id = TPS65090_ID_##_id, \
4b3bd55f	105	.ops = &tps65090_ops, \
452534e5 VB	106	.type = REGULATOR_VOLTAGE, \
	107	.owner = THIS_MODULE, \
	108	}, \
	109	}
	110
	111	static struct tps65090_regulator TPS65090_regulator[] = {
4b3bd55f AL	112	tps65090_REG(DCDC1),
	113	tps65090_REG(DCDC2),
	114	tps65090_REG(DCDC3),
	115	tps65090_REG(FET1),
	116	tps65090_REG(FET2),
	117	tps65090_REG(FET3),
	118	tps65090_REG(FET4),
	119	tps65090_REG(FET5),
	120	tps65090_REG(FET6),
	121	tps65090_REG(FET7),
452534e5 VB	122	};
	123
	124	static inline struct tps65090_regulator *find_regulator_info(int id)
	125	{
	126	struct tps65090_regulator *ri;
	127	int i;
	128
	129	for (i = 0; i < ARRAY_SIZE(TPS65090_regulator); i++) {
	130	ri = &TPS65090_regulator[i];
	131	if (ri->desc.id == id)
	132	return ri;
	133	}
	134	return NULL;
	135	}
	136
	137	static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
	138	{
	139	struct tps65090_regulator *ri = NULL;
	140	struct regulator_dev *rdev;
	141	struct tps65090_regulator_platform_data *tps_pdata;
	142	int id = pdev->id;
	143
	144	dev_dbg(&pdev->dev, "Probing regulator %d\n", id);
	145
	146	ri = find_regulator_info(id);
	147	if (ri == NULL) {
	148	dev_err(&pdev->dev, "invalid regulator ID specified\n");
	149	return -EINVAL;
	150	}
	151	tps_pdata = pdev->dev.platform_data;
	152	ri->dev = &pdev->dev;
	153
	154	rdev = regulator_register(&ri->desc, &pdev->dev,
	155	&tps_pdata->regulator, ri, NULL);
0ca2d6e6	156	if (IS_ERR(rdev)) {
452534e5 VB	157	dev_err(&pdev->dev, "failed to register regulator %s\n",
	158	ri->desc.name);
	159	return PTR_ERR(rdev);
	160	}
	161
	162	platform_set_drvdata(pdev, rdev);
	163	return 0;
	164	}
	165
	166	static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
	167	{
	168	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	169
	170	regulator_unregister(rdev);
	171	return 0;
	172	}
	173
	174	static struct platform_driver tps65090_regulator_driver = {
	175	.driver = {
	176	.name = "tps65090-regulator",
	177	.owner = THIS_MODULE,
	178	},
	179	.probe = tps65090_regulator_probe,
	180	.remove = __devexit_p(tps65090_regulator_remove),
	181	};
	182
	183	static int __init tps65090_regulator_init(void)
	184	{
	185	return platform_driver_register(&tps65090_regulator_driver);
	186	}
	187	subsys_initcall(tps65090_regulator_init);
	188
	189	static void __exit tps65090_regulator_exit(void)
	190	{
	191	platform_driver_unregister(&tps65090_regulator_driver);
	192	}
	193	module_exit(tps65090_regulator_exit);
	194
	195	MODULE_DESCRIPTION("tps65090 regulator driver");
	196	MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
	197	MODULE_LICENSE("GPL v2");