[mirror_ubuntu-artful-kernel.git] / drivers / regulator / max77693.c

/*
 * max77693.c - Regulator driver for the Maxim 77693
 *
 * Copyright (C) 2013 Samsung Electronics
 * Jonghwa Lee <jonghwa3.lee@samsung.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.
 *
 * This program is distributed in the hope that 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * This driver is based on max77686.c
 */

#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
#include <linux/regulator/of_regulator.h>

#define CHGIN_ILIM_STEP_20mA			20000

struct max77693_pmic_dev {
	struct device *dev;
	struct max77693_dev *iodev;
	int num_regulators;
	struct regulator_dev **rdev;
};

/* CHARGER regulator ops */
/* CHARGER regulator uses two bits for enabling */
static int max77693_chg_is_enabled(struct regulator_dev *rdev)
{
	int ret;
	u8 val;

	ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
	if (ret)
		return ret;

	return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
}

/*
 * CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
 * 0x00, 0x01, 0x2, 0x03	= 60 mA
 * 0x04 ~ 0x7E			= (60 + (X - 3) * 20) mA
 */
static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
{
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	unsigned int chg_max_uA = rdev->constraints->max_uA;
	u8 reg, sel;
	unsigned int val;
	int ret;

	ret = max77693_read_reg(rdev->regmap,
				MAX77693_CHG_REG_CHG_CNFG_09, &reg);
	if (ret < 0)
		return ret;

	sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;

	/* the first four codes for charger current are all 60mA */
	if (sel <= 3)
		sel = 0;
	else
		sel -= 3;

	val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
	if (val > chg_max_uA)
		return -EINVAL;

	return val;
}

static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
						int min_uA, int max_uA)
{
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	int sel = 0;

	while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
		sel++;

	if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
		return -EINVAL;

	/* the first four codes for charger current are all 60mA */
	sel += 3;

	return max77693_write_reg(rdev->regmap,
				MAX77693_CHG_REG_CHG_CNFG_09, sel);
}
/* end of CHARGER regulator ops */

static const unsigned int max77693_safeout_table[] = {
	4850000,
	4900000,
	4950000,
	3300000,
};

static struct regulator_ops max77693_safeout_ops = {
	.list_voltage		= regulator_list_voltage_table,
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
};

static struct regulator_ops max77693_charger_ops = {
	.is_enabled		= max77693_chg_is_enabled,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_current_limit	= max77693_chg_get_current_limit,
	.set_current_limit	= max77693_chg_set_current_limit,
};

#define regulator_desc_esafeout(_num)	{			\
	.name		= "ESAFEOUT"#_num,			\
	.id		= MAX77693_ESAFEOUT##_num,		\
	.n_voltages	= 4,					\
	.ops		= &max77693_safeout_ops,		\
	.type		= REGULATOR_VOLTAGE,			\
	.volt_table	= max77693_safeout_table,		\
	.vsel_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
	.vsel_mask	= SAFEOUT_CTRL_SAFEOUT##_num##_MASK,	\
	.enable_reg	= MAX77693_CHG_REG_SAFEOUT_CTRL,	\
	.enable_mask	= SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK ,	\
}

static struct regulator_desc regulators[] = {
	regulator_desc_esafeout(1),
	regulator_desc_esafeout(2),
	{
		.name = "CHARGER",
		.id = MAX77693_CHARGER,
		.ops = &max77693_charger_ops,
		.type = REGULATOR_CURRENT,
		.owner = THIS_MODULE,
		.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
		.enable_mask = CHG_CNFG_00_CHG_MASK |
				CHG_CNFG_00_BUCK_MASK,
	},
};

#ifdef CONFIG_OF
static int max77693_pmic_dt_parse_rdata(struct device *dev,
					struct max77693_regulator_data **rdata)
{
	struct device_node *np;
	struct of_regulator_match *rmatch;
	struct max77693_regulator_data *tmp;
	int i, matched = 0;

	np = of_find_node_by_name(dev->parent->of_node, "regulators");
	if (!np)
		return -EINVAL;

	rmatch = devm_kzalloc(dev,
		 sizeof(*rmatch) * ARRAY_SIZE(regulators), GFP_KERNEL);
	if (!rmatch)
		return -ENOMEM;

	for (i = 0; i < ARRAY_SIZE(regulators); i++)
		rmatch[i].name = regulators[i].name;

	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
	if (matched <= 0)
		return matched;
	*rdata = devm_kzalloc(dev, sizeof(**rdata) * matched, GFP_KERNEL);
	if (!(*rdata))
		return -ENOMEM;

	tmp = *rdata;

	for (i = 0; i < matched; i++) {
		tmp->initdata = rmatch[i].init_data;
		tmp->of_node = rmatch[i].of_node;
		tmp->id = regulators[i].id;
		tmp++;
	}

	return matched;
}
#else
static int max77693_pmic_dt_parse_rdata(struct device *dev,
					struct max77693_regulator_data **rdata)
{
	return 0;
}
#endif /* CONFIG_OF */

static int max77693_pmic_init_rdata(struct device *dev,
				    struct max77693_regulator_data **rdata)
{
	struct max77693_platform_data *pdata;
	int num_regulators = 0;

	pdata = dev_get_platdata(dev->parent);
	if (pdata) {
		*rdata = pdata->regulators;
		num_regulators = pdata->num_regulators;
	}

	if (!(*rdata) && dev->parent->of_node)
		num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);

	return num_regulators;
}

static int max77693_pmic_probe(struct platform_device *pdev)
{
	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct max77693_pmic_dev *max77693_pmic;
	struct max77693_regulator_data *rdata = NULL;
	int num_rdata, i, ret;
	struct regulator_config config;

	num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
	if (!rdata || num_rdata <= 0) {
		dev_err(&pdev->dev, "No init data supplied.\n");
		return -ENODEV;
	}

	max77693_pmic = devm_kzalloc(&pdev->dev,
				sizeof(struct max77693_pmic_dev),
				GFP_KERNEL);
	if (!max77693_pmic)
		return -ENOMEM;

	max77693_pmic->rdev = devm_kzalloc(&pdev->dev,
				sizeof(struct regulator_dev *) * num_rdata,
				GFP_KERNEL);
	if (!max77693_pmic->rdev)
		return -ENOMEM;

	max77693_pmic->dev = &pdev->dev;
	max77693_pmic->iodev = iodev;
	max77693_pmic->num_regulators = num_rdata;

	config.dev = &pdev->dev;
	config.regmap = iodev->regmap;
	config.driver_data = max77693_pmic;
	platform_set_drvdata(pdev, max77693_pmic);

	for (i = 0; i < max77693_pmic->num_regulators; i++) {
		int id = rdata[i].id;

		config.init_data = rdata[i].initdata;
		config.of_node = rdata[i].of_node;

		max77693_pmic->rdev[i] = regulator_register(&regulators[id],
							    &config);
		if (IS_ERR(max77693_pmic->rdev[i])) {
			ret = PTR_ERR(max77693_pmic->rdev[i]);
			dev_err(max77693_pmic->dev,
				"Failed to initialize regulator-%d\n", id);
			max77693_pmic->rdev[i] = NULL;
			goto err;
		}
	}

	return 0;
 err:
	while (--i >= 0)
		regulator_unregister(max77693_pmic->rdev[i]);

	return ret;
}

static int max77693_pmic_remove(struct platform_device *pdev)
{
	struct max77693_pmic_dev *max77693_pmic = platform_get_drvdata(pdev);
	struct regulator_dev **rdev = max77693_pmic->rdev;
	int i;

	for (i = 0; i < max77693_pmic->num_regulators; i++)
		if (rdev[i])
			regulator_unregister(rdev[i]);

	return 0;
}

static const struct platform_device_id max77693_pmic_id[] = {
	{"max77693-pmic", 0},
	{},
};

MODULE_DEVICE_TABLE(platform, max77693_pmic_id);

static struct platform_driver max77693_pmic_driver = {
	.driver = {
		   .name = "max77693-pmic",
		   .owner = THIS_MODULE,
		   },
	.probe = max77693_pmic_probe,
	.remove = max77693_pmic_remove,
	.id_table = max77693_pmic_id,
};

module_platform_driver(max77693_pmic_driver);

MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
80b022e2 JL	1	/*
	2	* max77693.c - Regulator driver for the Maxim 77693
	3	*
	4	* Copyright (C) 2013 Samsung Electronics
	5	* Jonghwa Lee <jonghwa3.lee@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	* This driver is based on max77686.c
	22	*/
	23
	24	#include <linux/err.h>
	25	#include <linux/slab.h>
	26	#include <linux/platform_device.h>
	27	#include <linux/module.h>
	28	#include <linux/export.h>
	29	#include <linux/regulator/driver.h>
	30	#include <linux/regulator/machine.h>
	31	#include <linux/mfd/max77693.h>
	32	#include <linux/mfd/max77693-private.h>
	33	#include <linux/regulator/of_regulator.h>
	34
	35	#define CHGIN_ILIM_STEP_20mA 20000
	36
	37	struct max77693_pmic_dev {
	38	struct device *dev;
	39	struct max77693_dev *iodev;
	40	int num_regulators;
	41	struct regulator_dev **rdev;
	42	};
	43
	44	/* CHARGER regulator ops */
	45	/* CHARGER regulator uses two bits for enabling */
	46	static int max77693_chg_is_enabled(struct regulator_dev *rdev)
	47	{
	48	int ret;
	49	u8 val;
	50
	51	ret = max77693_read_reg(rdev->regmap, rdev->desc->enable_reg, &val);
	52	if (ret)
	53	return ret;
	54
	55	return (val & rdev->desc->enable_mask) == rdev->desc->enable_mask;
	56	}
	57
	58	/*
	59	* CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
	60	* 0x00, 0x01, 0x2, 0x03 = 60 mA
	61	* 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA
	62	*/
	63	static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
	64	{
65	unsigned int chg_min_uA = rdev->constraints->min_uA;
66	unsigned int chg_max_uA = rdev->constraints->max_uA;
67	u8 reg, sel;
68	unsigned int val;
69	int ret;
70
71	ret = max77693_read_reg(rdev->regmap,
72	MAX77693_CHG_REG_CHG_CNFG_09, &reg);
73	if (ret < 0)
74	return ret;
75
76	sel = reg & CHG_CNFG_09_CHGIN_ILIM_MASK;
77
78	/* the first four codes for charger current are all 60mA */
79	if (sel <= 3)
80	sel = 0;
81	else
82	sel -= 3;
83
84	val = chg_min_uA + CHGIN_ILIM_STEP_20mA * sel;
85	if (val > chg_max_uA)
86	return -EINVAL;
87
88	return val;
89	}
90
91	static int max77693_chg_set_current_limit(struct regulator_dev *rdev,
92	int min_uA, int max_uA)
93	{
94	unsigned int chg_min_uA = rdev->constraints->min_uA;
95	int sel = 0;
96
97	while (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel < min_uA)
98	sel++;
99
f3ecdd7b	100	if (chg_min_uA + CHGIN_ILIM_STEP_20mA * sel > max_uA)
80b022e2 JL	101	return -EINVAL;
	102
	103	/* the first four codes for charger current are all 60mA */
	104	sel += 3;
	105
	106	return max77693_write_reg(rdev->regmap,
	107	MAX77693_CHG_REG_CHG_CNFG_09, sel);
	108	}
	109	/* end of CHARGER regulator ops */
	110
	111	static const unsigned int max77693_safeout_table[] = {
	112	4850000,
	113	4900000,
	114	4950000,
	115	3300000,
	116	};
	117
	118	static struct regulator_ops max77693_safeout_ops = {
	119	.list_voltage = regulator_list_voltage_table,
	120	.is_enabled = regulator_is_enabled_regmap,
	121	.enable = regulator_enable_regmap,
	122	.disable = regulator_disable_regmap,
	123	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	124	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	125	};
	126
	127	static struct regulator_ops max77693_charger_ops = {
	128	.is_enabled = max77693_chg_is_enabled,
	129	.enable = regulator_enable_regmap,
	130	.disable = regulator_disable_regmap,
	131	.get_current_limit = max77693_chg_get_current_limit,
	132	.set_current_limit = max77693_chg_set_current_limit,
	133	};
	134
	135	#define regulator_desc_esafeout(_num) { \
	136	.name = "ESAFEOUT"#_num, \
	137	.id = MAX77693_ESAFEOUT##_num, \
	138	.n_voltages = 4, \
	139	.ops = &max77693_safeout_ops, \
	140	.type = REGULATOR_VOLTAGE, \
	141	.volt_table = max77693_safeout_table, \
	142	.vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
	143	.vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \
	144	.enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \
	145	.enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \
	146	}
	147
	148	static struct regulator_desc regulators[] = {
	149	regulator_desc_esafeout(1),
	150	regulator_desc_esafeout(2),
	151	{
	152	.name = "CHARGER",
	153	.id = MAX77693_CHARGER,
	154	.ops = &max77693_charger_ops,
	155	.type = REGULATOR_CURRENT,
	156	.owner = THIS_MODULE,
	157	.enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,
	158	.enable_mask = CHG_CNFG_00_CHG_MASK \|
	159	CHG_CNFG_00_BUCK_MASK,
	160	},
	161	};
	162
	163	#ifdef CONFIG_OF
	164	static int max77693_pmic_dt_parse_rdata(struct device *dev,
165	struct max77693_regulator_data **rdata)
166	{
167	struct device_node *np;
168	struct of_regulator_match *rmatch;
169	struct max77693_regulator_data *tmp;
170	int i, matched = 0;
171
172	np = of_find_node_by_name(dev->parent->of_node, "regulators");
173	if (!np)
174	return -EINVAL;
175
176	rmatch = devm_kzalloc(dev,
177	sizeof(rmatch) ARRAY_SIZE(regulators), GFP_KERNEL);
178	if (!rmatch)
179	return -ENOMEM;
180
181	for (i = 0; i < ARRAY_SIZE(regulators); i++)
182	rmatch[i].name = regulators[i].name;
183
184	matched = of_regulator_match(dev, np, rmatch, ARRAY_SIZE(regulators));
185	if (matched <= 0)
186	return matched;
187	rdata = devm_kzalloc(dev, sizeof(rdata) matched, GFP_KERNEL);
188	if (!(*rdata))
189	return -ENOMEM;
190
191	tmp = *rdata;
192
8c7e7ddf	193	for (i = 0; i < matched; i++) {
80b022e2 JL	194	tmp->initdata = rmatch[i].init_data;
	195	tmp->of_node = rmatch[i].of_node;
	196	tmp->id = regulators[i].id;
	197	tmp++;
	198	}
	199
	200	return matched;
	201	}
	202	#else
	203	static int max77693_pmic_dt_parse_rdata(struct device *dev,
	204	struct max77693_regulator_data **rdata)
	205	{
	206	return 0;
	207	}
	208	#endif /* CONFIG_OF */
	209
	210	static int max77693_pmic_init_rdata(struct device *dev,
	211	struct max77693_regulator_data **rdata)
	212	{
	213	struct max77693_platform_data *pdata;
	214	int num_regulators = 0;
	215
	216	pdata = dev_get_platdata(dev->parent);
	217	if (pdata) {
	218	*rdata = pdata->regulators;
	219	num_regulators = pdata->num_regulators;
	220	}
	221
	222	if (!(*rdata) && dev->parent->of_node)
	223	num_regulators = max77693_pmic_dt_parse_rdata(dev, rdata);
	224
	225	return num_regulators;
	226	}
	227
	228	static int max77693_pmic_probe(struct platform_device *pdev)
	229	{
	230	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	231	struct max77693_pmic_dev *max77693_pmic;
	232	struct max77693_regulator_data *rdata = NULL;
	233	int num_rdata, i, ret;
	234	struct regulator_config config;
	235
	236	num_rdata = max77693_pmic_init_rdata(&pdev->dev, &rdata);
	237	if (!rdata \|\| num_rdata <= 0) {
	238	dev_err(&pdev->dev, "No init data supplied.\n");
	239	return -ENODEV;
	240	}
	241
	242	max77693_pmic = devm_kzalloc(&pdev->dev,
	243	sizeof(struct max77693_pmic_dev),
	244	GFP_KERNEL);
	245	if (!max77693_pmic)
	246	return -ENOMEM;
	247
	248	max77693_pmic->rdev = devm_kzalloc(&pdev->dev,
	249	sizeof(struct regulator_dev ) num_rdata,
	250	GFP_KERNEL);
	251	if (!max77693_pmic->rdev)
	252	return -ENOMEM;
	253
	254	max77693_pmic->dev = &pdev->dev;
	255	max77693_pmic->iodev = iodev;
	256	max77693_pmic->num_regulators = num_rdata;
	257
258	config.dev = &pdev->dev;
259	config.regmap = iodev->regmap;
260	config.driver_data = max77693_pmic;
261	platform_set_drvdata(pdev, max77693_pmic);
262
263	for (i = 0; i < max77693_pmic->num_regulators; i++) {
264	int id = rdata[i].id;
265
266	config.init_data = rdata[i].initdata;
267	config.of_node = rdata[i].of_node;
268
269	max77693_pmic->rdev[i] = regulator_register(&regulators[id],
270	&config);
271	if (IS_ERR(max77693_pmic->rdev[i])) {
272	ret = PTR_ERR(max77693_pmic->rdev[i]);
273	dev_err(max77693_pmic->dev,
274	"Failed to initialize regulator-%d\n", id);
275	max77693_pmic->rdev[i] = NULL;
276	goto err;
277	}
278	}
279
280	return 0;
281	err:
282	while (--i >= 0)
283	regulator_unregister(max77693_pmic->rdev[i]);
284
285	return ret;
286	}
287
288	static int max77693_pmic_remove(struct platform_device *pdev)
289	{
290	struct max77693_pmic_dev *max77693_pmic = platform_get_drvdata(pdev);
291	struct regulator_dev **rdev = max77693_pmic->rdev;
292	int i;
293
294	for (i = 0; i < max77693_pmic->num_regulators; i++)
295	if (rdev[i])
296	regulator_unregister(rdev[i]);
297
298	return 0;
299	}
300
301	static const struct platform_device_id max77693_pmic_id[] = {
302	{"max77693-pmic", 0},
303	{},
304	};
305
306	MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
307
308	static struct platform_driver max77693_pmic_driver = {
309	.driver = {
310	.name = "max77693-pmic",
311	.owner = THIS_MODULE,
312	},
313	.probe = max77693_pmic_probe,
314	.remove = max77693_pmic_remove,
315	.id_table = max77693_pmic_id,
316	};
317
318	module_platform_driver(max77693_pmic_driver);
319
320	MODULE_DESCRIPTION("MAXIM MAX77693 regulator driver");
321	MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
322	MODULE_LICENSE("GPL");