[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/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>

struct tps65090_regulator {
	struct device		*dev;
	struct regulator_desc	*desc;
	struct regulator_dev	*rdev;
};

static struct regulator_ops tps65090_ops = {
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
};

#define tps65090_REG_DESC(_id, _sname, _en_reg, _ops)	\
{							\
	.name = "TPS65090_RAILS"#_id,			\
	.supply_name = _sname,				\
	.id = TPS65090_ID_##_id,			\
	.ops = &_ops,					\
	.enable_reg = _en_reg,				\
	.enable_mask = BIT(0),				\
	.type = REGULATOR_VOLTAGE,			\
	.owner = THIS_MODULE,				\
}

static struct regulator_desc tps65090_regulator_desc[] = {
	tps65090_REG_DESC(DCDC1, "vsys1",   0x0C, tps65090_ops),
	tps65090_REG_DESC(DCDC2, "vsys2",   0x0D, tps65090_ops),
	tps65090_REG_DESC(DCDC3, "vsys3",   0x0E, tps65090_ops),
	tps65090_REG_DESC(FET1,  "infet1",  0x0F, tps65090_ops),
	tps65090_REG_DESC(FET2,  "infet2",  0x10, tps65090_ops),
	tps65090_REG_DESC(FET3,  "infet3",  0x11, tps65090_ops),
	tps65090_REG_DESC(FET4,  "infet4",  0x12, tps65090_ops),
	tps65090_REG_DESC(FET5,  "infet5",  0x13, tps65090_ops),
	tps65090_REG_DESC(FET6,  "infet6",  0x14, tps65090_ops),
	tps65090_REG_DESC(FET7,  "infet7",  0x15, tps65090_ops),
};

static inline bool is_dcdc(int id)
{
	switch (id) {
	case TPS65090_ID_DCDC1:
	case TPS65090_ID_DCDC2:
	case TPS65090_ID_DCDC3:
		return true;
	default:
		return false;
	}
}

static int __devinit tps65090_config_ext_control(
	struct tps65090_regulator *ri, bool enable)
{
	int ret;
	struct device *parent = ri->dev->parent;
	unsigned int reg_en_reg = ri->desc->enable_reg;

	if (enable)
		ret = tps65090_set_bits(parent, reg_en_reg, 1);
	else
		ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
	if (ret < 0)
		dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
	return ret;
}

static int __devinit tps65090_regulator_disable_ext_control(
		struct tps65090_regulator *ri,
		struct tps65090_regulator_plat_data *tps_pdata)
{
	int ret = 0;
	struct device *parent = ri->dev->parent;
	unsigned int reg_en_reg = ri->desc->enable_reg;

	/*
	 * First enable output for internal control if require.
	 * And then disable external control.
	 */
	if (tps_pdata->reg_init_data->constraints.always_on ||
			tps_pdata->reg_init_data->constraints.boot_on) {
		ret =  tps65090_set_bits(parent, reg_en_reg, 0);
		if (ret < 0) {
			dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
			return ret;
		}
	}
	return tps65090_config_ext_control(ri, false);
}

static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
{
	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
	struct tps65090_regulator *ri = NULL;
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	struct tps65090_regulator_plat_data *tps_pdata;
	struct tps65090_regulator *pmic;
	struct tps65090_platform_data *tps65090_pdata;
	int num;
	int ret;

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

	tps65090_pdata = dev_get_platdata(pdev->dev.parent);
	if (!tps65090_pdata) {
		dev_err(&pdev->dev, "Platform data missing\n");
		return -EINVAL;
	}

	pmic = devm_kzalloc(&pdev->dev, TPS65090_ID_MAX * sizeof(*pmic),
			GFP_KERNEL);
	if (!pmic) {
		dev_err(&pdev->dev, "mem alloc for pmic failed\n");
		return -ENOMEM;
	}

	for (num = 0; num < TPS65090_ID_MAX; num++) {
		tps_pdata = tps65090_pdata->reg_pdata[num];

		ri = &pmic[num];
		ri->dev = &pdev->dev;
		ri->desc = &tps65090_regulator_desc[num];

		/*
		 * TPS5090 DCDC support the control from external digital input.
		 * It may be possible that during boot, the external control is
		 * enabled. Disabling external control for DCDC.
		 */
		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
			ret = tps65090_regulator_disable_ext_control(
						ri, tps_pdata);
			if (ret < 0) {
				dev_err(&pdev->dev,
						"failed disable ext control\n");
				goto scrub;
			}
		}
		config.dev = &pdev->dev;
		config.driver_data = ri;
		config.regmap = tps65090_mfd->rmap;
		if (tps_pdata)
			config.init_data = tps_pdata->reg_init_data;
		else
			config.init_data = NULL;

		rdev = regulator_register(ri->desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev, "failed to register regulator %s\n",
				ri->desc->name);
			ret = PTR_ERR(rdev);
			goto scrub;
		}
		ri->rdev = rdev;
	}

	platform_set_drvdata(pdev, pmic);
	return 0;

scrub:
	while (--num >= 0) {
		ri = &pmic[num];
		regulator_unregister(ri->rdev);
	}
	return ret;
}

static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
{
	struct tps65090_regulator *pmic = platform_get_drvdata(pdev);
	struct tps65090_regulator *ri;
	int num;

	for (num = 0; num < TPS65090_ID_MAX; ++num) {
		ri = &pmic[num];
		regulator_unregister(ri->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>
452534e5 VB	20	#include <linux/init.h>
	21	#include <linux/slab.h>
	22	#include <linux/err.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/regulator/driver.h>
	25	#include <linux/regulator/machine.h>
	26	#include <linux/mfd/tps65090.h>
452534e5 VB	27
452534e5 VB	28	struct tps65090_regulator {
452534e5	29	struct device *dev;
24282a1c LD	30	struct regulator_desc *desc;
24282a1c LD	31	struct regulator_dev *rdev;
452534e5 VB	32	};
452534e5 VB	33
452534e5	34	static struct regulator_ops tps65090_ops = {
06c4998b AL	35	.enable = regulator_enable_regmap,
	36	.disable = regulator_disable_regmap,
	37	.is_enabled = regulator_is_enabled_regmap,
452534e5 VB	38	};
452534e5 VB	39
24282a1c	40	#define tps65090_REG_DESC(_id, _sname, _en_reg, _ops) \
452534e5	41	{ \
24282a1c LD	42	.name = "TPS65090_RAILS"#_id, \
	43	.supply_name = _sname, \
	44	.id = TPS65090_ID_##_id, \
	45	.ops = &_ops, \
	46	.enable_reg = _en_reg, \
	47	.enable_mask = BIT(0), \
	48	.type = REGULATOR_VOLTAGE, \
	49	.owner = THIS_MODULE, \
452534e5 VB	50	}
452534e5 VB	51
24282a1c LD	52	static struct regulator_desc tps65090_regulator_desc[] = {
	53	tps65090_REG_DESC(DCDC1, "vsys1", 0x0C, tps65090_ops),
	54	tps65090_REG_DESC(DCDC2, "vsys2", 0x0D, tps65090_ops),
	55	tps65090_REG_DESC(DCDC3, "vsys3", 0x0E, tps65090_ops),
	56	tps65090_REG_DESC(FET1, "infet1", 0x0F, tps65090_ops),
	57	tps65090_REG_DESC(FET2, "infet2", 0x10, tps65090_ops),
	58	tps65090_REG_DESC(FET3, "infet3", 0x11, tps65090_ops),
	59	tps65090_REG_DESC(FET4, "infet4", 0x12, tps65090_ops),
	60	tps65090_REG_DESC(FET5, "infet5", 0x13, tps65090_ops),
	61	tps65090_REG_DESC(FET6, "infet6", 0x14, tps65090_ops),
	62	tps65090_REG_DESC(FET7, "infet7", 0x15, tps65090_ops),
452534e5 VB	63	};
452534e5 VB	64
24282a1c	65	static inline bool is_dcdc(int id)
452534e5	66	{
24282a1c LD	67	switch (id) {
	68	case TPS65090_ID_DCDC1:
	69	case TPS65090_ID_DCDC2:
	70	case TPS65090_ID_DCDC3:
	71	return true;
	72	default:
	73	return false;
	74	}
	75	}
452534e5	76
24282a1c LD	77	static int __devinit tps65090_config_ext_control(
	78	struct tps65090_regulator *ri, bool enable)
	79	{
	80	int ret;
	81	struct device *parent = ri->dev->parent;
	82	unsigned int reg_en_reg = ri->desc->enable_reg;
	83
	84	if (enable)
	85	ret = tps65090_set_bits(parent, reg_en_reg, 1);
	86	else
	87	ret = tps65090_clr_bits(parent, reg_en_reg, 1);
	88	if (ret < 0)
	89	dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
	90	return ret;
	91	}
	92
	93	static int __devinit tps65090_regulator_disable_ext_control(
	94	struct tps65090_regulator *ri,
	95	struct tps65090_regulator_plat_data *tps_pdata)
	96	{
	97	int ret = 0;
	98	struct device *parent = ri->dev->parent;
	99	unsigned int reg_en_reg = ri->desc->enable_reg;
	100
	101	/*
	102	* First enable output for internal control if require.
	103	* And then disable external control.
	104	*/
	105	if (tps_pdata->reg_init_data->constraints.always_on \|\|
	106	tps_pdata->reg_init_data->constraints.boot_on) {
	107	ret = tps65090_set_bits(parent, reg_en_reg, 0);
	108	if (ret < 0) {
	109	dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
	110	return ret;
	111	}
452534e5	112	}
24282a1c	113	return tps65090_config_ext_control(ri, false);
452534e5 VB	114	}
	115
	116	static int __devinit tps65090_regulator_probe(struct platform_device *pdev)
	117	{
06c4998b	118	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
452534e5	119	struct tps65090_regulator *ri = NULL;
c172708d	120	struct regulator_config config = { };
452534e5	121	struct regulator_dev *rdev;
24282a1c LD	122	struct tps65090_regulator_plat_data *tps_pdata;
	123	struct tps65090_regulator *pmic;
	124	struct tps65090_platform_data *tps65090_pdata;
	125	int num;
	126	int ret;
452534e5	127
24282a1c	128	dev_dbg(&pdev->dev, "Probing regulator\n");
452534e5	129
24282a1c LD	130	tps65090_pdata = dev_get_platdata(pdev->dev.parent);
	131	if (!tps65090_pdata) {
	132	dev_err(&pdev->dev, "Platform data missing\n");
452534e5 VB	133	return -EINVAL;
452534e5 VB	134	}
24282a1c LD	135
	136	pmic = devm_kzalloc(&pdev->dev, TPS65090_ID_MAX * sizeof(*pmic),
	137	GFP_KERNEL);
	138	if (!pmic) {
	139	dev_err(&pdev->dev, "mem alloc for pmic failed\n");
	140	return -ENOMEM;
	141	}
	142
	143	for (num = 0; num < TPS65090_ID_MAX; num++) {
	144	tps_pdata = tps65090_pdata->reg_pdata[num];
	145
	146	ri = &pmic[num];
	147	ri->dev = &pdev->dev;
	148	ri->desc = &tps65090_regulator_desc[num];
	149
	150	/*
	151	* TPS5090 DCDC support the control from external digital input.
	152	* It may be possible that during boot, the external control is
	153	* enabled. Disabling external control for DCDC.
	154	*/
	155	if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
	156	ret = tps65090_regulator_disable_ext_control(
	157	ri, tps_pdata);
	158	if (ret < 0) {
	159	dev_err(&pdev->dev,
	160	"failed disable ext control\n");
	161	goto scrub;
	162	}
	163	}
	164	config.dev = &pdev->dev;
	165	config.driver_data = ri;
	166	config.regmap = tps65090_mfd->rmap;
	167	if (tps_pdata)
	168	config.init_data = tps_pdata->reg_init_data;
	169	else
	170	config.init_data = NULL;
	171
	172	rdev = regulator_register(ri->desc, &config);
	173	if (IS_ERR(rdev)) {
	174	dev_err(&pdev->dev, "failed to register regulator %s\n",
	175	ri->desc->name);
	176	ret = PTR_ERR(rdev);
	177	goto scrub;
	178	}
	179	ri->rdev = rdev;
452534e5 VB	180	}
452534e5 VB	181
24282a1c	182	platform_set_drvdata(pdev, pmic);
452534e5	183	return 0;
24282a1c LD	184
	185	scrub:
	186	while (--num >= 0) {
	187	ri = &pmic[num];
	188	regulator_unregister(ri->rdev);
	189	}
	190	return ret;
452534e5 VB	191	}
	192
	193	static int __devexit tps65090_regulator_remove(struct platform_device *pdev)
	194	{
24282a1c LD	195	struct tps65090_regulator *pmic = platform_get_drvdata(pdev);
	196	struct tps65090_regulator *ri;
	197	int num;
452534e5	198
24282a1c LD	199	for (num = 0; num < TPS65090_ID_MAX; ++num) {
	200	ri = &pmic[num];
	201	regulator_unregister(ri->rdev);
	202	}
452534e5 VB	203	return 0;
	204	}
	205
	206	static struct platform_driver tps65090_regulator_driver = {
	207	.driver = {
	208	.name = "tps65090-regulator",
	209	.owner = THIS_MODULE,
	210	},
	211	.probe = tps65090_regulator_probe,
	212	.remove = __devexit_p(tps65090_regulator_remove),
	213	};
	214
	215	static int __init tps65090_regulator_init(void)
	216	{
	217	return platform_driver_register(&tps65090_regulator_driver);
	218	}
	219	subsys_initcall(tps65090_regulator_init);
	220
	221	static void __exit tps65090_regulator_exit(void)
	222	{
	223	platform_driver_unregister(&tps65090_regulator_driver);
	224	}
	225	module_exit(tps65090_regulator_exit);
	226
	227	MODULE_DESCRIPTION("tps65090 regulator driver");
	228	MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
	229	MODULE_LICENSE("GPL v2");