[linux-2.6-block.git] / drivers / regulator / max77843.c

/*
 * max77843.c - Regulator driver for the Maxim MAX77843
 *
 * Copyright (C) 2015 Samsung Electronics
 * Author: Jaewon Kim <jaewon02.kim@samsung.com>
 * Author: Beomho Seo <beomho.seo@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.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/max77843-private.h>
#include <linux/regulator/of_regulator.h>

enum max77843_regulator_type {
	MAX77843_SAFEOUT1 = 0,
	MAX77843_SAFEOUT2,
	MAX77843_CHARGER,

	MAX77843_NUM,
};

static const unsigned int max77843_safeout_voltage_table[] = {
	4850000,
	4900000,
	4950000,
	3300000,
};

static int max77843_reg_is_enabled(struct regulator_dev *rdev)
{
	struct regmap *regmap = rdev->regmap;
	int ret;
	unsigned int reg;

	ret = regmap_read(regmap, rdev->desc->enable_reg, &reg);
	if (ret) {
		dev_err(&rdev->dev, "Fialed to read charger register\n");
		return ret;
	}

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

static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
{
	struct regmap *regmap = rdev->regmap;
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	unsigned int chg_max_uA = rdev->constraints->max_uA;
	unsigned int val;
	int ret;
	unsigned int reg, sel;

	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg);
	if (ret) {
		dev_err(&rdev->dev, "Failed to read charger register\n");
		return ret;
	}

	sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;

	if (sel < 0x03)
		sel = 0;
	else
		sel -= 2;

	val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
	if (val > chg_max_uA)
		return -EINVAL;

	return val;
}

static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
		int min_uA, int max_uA)
{
	struct regmap *regmap = rdev->regmap;
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	int sel = 0;

	while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
		sel++;

	if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
		return -EINVAL;

	sel += 2;

	return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
}

static struct regulator_ops max77843_charger_ops = {
	.is_enabled		= max77843_reg_is_enabled,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_current_limit	= max77843_reg_get_current_limit,
	.set_current_limit	= max77843_reg_set_current_limit,
};

static struct regulator_ops max77843_regulator_ops = {
	.is_enabled             = regulator_is_enabled_regmap,
	.enable                 = regulator_enable_regmap,
	.disable                = regulator_disable_regmap,
	.list_voltage		= regulator_list_voltage_table,
	.get_voltage_sel        = regulator_get_voltage_sel_regmap,
	.set_voltage_sel        = regulator_set_voltage_sel_regmap,
};

static const struct regulator_desc max77843_supported_regulators[] = {
	[MAX77843_SAFEOUT1] = {
		.name		= "SAFEOUT1",
		.id		= MAX77843_SAFEOUT1,
		.ops		= &max77843_regulator_ops,
		.of_match	= of_match_ptr("SAFEOUT1"),
		.regulators_node = of_match_ptr("regulators"),
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= ARRAY_SIZE(max77843_safeout_voltage_table),
		.volt_table	= max77843_safeout_voltage_table,
		.enable_reg	= MAX77843_SYS_REG_SAFEOUTCTRL,
		.enable_mask	= MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1,
		.vsel_reg	= MAX77843_SYS_REG_SAFEOUTCTRL,
		.vsel_mask	= MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK,
	},
	[MAX77843_SAFEOUT2] = {
		.name           = "SAFEOUT2",
		.id             = MAX77843_SAFEOUT2,
		.ops            = &max77843_regulator_ops,
		.of_match	= of_match_ptr("SAFEOUT2"),
		.regulators_node = of_match_ptr("regulators"),
		.type           = REGULATOR_VOLTAGE,
		.owner          = THIS_MODULE,
		.n_voltages	= ARRAY_SIZE(max77843_safeout_voltage_table),
		.volt_table	= max77843_safeout_voltage_table,
		.enable_reg     = MAX77843_SYS_REG_SAFEOUTCTRL,
		.enable_mask    = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2,
		.vsel_reg	= MAX77843_SYS_REG_SAFEOUTCTRL,
		.vsel_mask	= MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK,
	},
	[MAX77843_CHARGER] = {
		.name		= "CHARGER",
		.id		= MAX77843_CHARGER,
		.ops		= &max77843_charger_ops,
		.of_match	= of_match_ptr("CHARGER"),
		.regulators_node = of_match_ptr("regulators"),
		.type		= REGULATOR_CURRENT,
		.owner		= THIS_MODULE,
		.enable_reg	= MAX77843_CHG_REG_CHG_CNFG_00,
		.enable_mask	= MAX77843_CHG_MASK,
	},
};

static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id)
{
	switch (reg_id) {
	case MAX77843_SAFEOUT1:
	case MAX77843_SAFEOUT2:
		return max77843->regmap;
	case MAX77843_CHARGER:
		return max77843->regmap_chg;
	default:
		return max77843->regmap;
	}
}

static int max77843_regulator_probe(struct platform_device *pdev)
{
	struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = {};
	int i;

	config.dev = max77843->dev;
	config.driver_data = max77843;

	for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
		struct regulator_dev *regulator;

		config.regmap = max77843_get_regmap(max77843,
				max77843_supported_regulators[i].id);

		regulator = devm_regulator_register(&pdev->dev,
				&max77843_supported_regulators[i], &config);
		if (IS_ERR(regulator)) {
			dev_err(&pdev->dev,
					"Failed to regiser regulator-%d\n", i);
			return PTR_ERR(regulator);
		}
	}

	return 0;
}

static const struct platform_device_id max77843_regulator_id[] = {
	{ "max77843-regulator", },
	{ /* sentinel */ },
};

static struct platform_driver max77843_regulator_driver = {
	.driver	= {
		.name = "max77843-regulator",
	},
	.probe		= max77843_regulator_probe,
	.id_table	= max77843_regulator_id,
};

static int __init max77843_regulator_init(void)
{
	return platform_driver_register(&max77843_regulator_driver);
}
subsys_initcall(max77843_regulator_init);

static void __exit max77843_regulator_exit(void)
{
	platform_driver_unregister(&max77843_regulator_driver);
}
module_exit(max77843_regulator_exit);

MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9dfffb7a JK	1	/*
	2	* max77843.c - Regulator driver for the Maxim MAX77843
	3	*
	4	* Copyright (C) 2015 Samsung Electronics
	5	* Author: Jaewon Kim <jaewon02.kim@samsung.com>
	6	* Author: Beomho Seo <beomho.seo@samsung.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*/
	13
	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/regulator/driver.h>
	17	#include <linux/regulator/machine.h>
	18	#include <linux/mfd/max77843-private.h>
	19	#include <linux/regulator/of_regulator.h>
	20
	21	enum max77843_regulator_type {
	22	MAX77843_SAFEOUT1 = 0,
	23	MAX77843_SAFEOUT2,
	24	MAX77843_CHARGER,
	25
	26	MAX77843_NUM,
	27	};
	28
	29	static const unsigned int max77843_safeout_voltage_table[] = {
	30	4850000,
	31	4900000,
	32	4950000,
	33	3300000,
	34	};
	35
	36	static int max77843_reg_is_enabled(struct regulator_dev *rdev)
	37	{
	38	struct regmap *regmap = rdev->regmap;
	39	int ret;
	40	unsigned int reg;
	41
	42	ret = regmap_read(regmap, rdev->desc->enable_reg, &reg);
	43	if (ret) {
	44	dev_err(&rdev->dev, "Fialed to read charger register\n");
	45	return ret;
	46	}
	47
	48	return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask;
	49	}
	50
	51	static int max77843_reg_get_current_limit(struct regulator_dev *rdev)
	52	{
	53	struct regmap *regmap = rdev->regmap;
	54	unsigned int chg_min_uA = rdev->constraints->min_uA;
	55	unsigned int chg_max_uA = rdev->constraints->max_uA;
	56	unsigned int val;
	57	int ret;
	58	unsigned int reg, sel;
	59
	60	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg);
	61	if (ret) {
	62	dev_err(&rdev->dev, "Failed to read charger register\n");
	63	return ret;
	64	}
65
66	sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK;
67
68	if (sel < 0x03)
69	sel = 0;
70	else
71	sel -= 2;
72
73	val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel;
74	if (val > chg_max_uA)
75	return -EINVAL;
76
77	return val;
78	}
79
80	static int max77843_reg_set_current_limit(struct regulator_dev *rdev,
81	int min_uA, int max_uA)
82	{
83	struct regmap *regmap = rdev->regmap;
84	unsigned int chg_min_uA = rdev->constraints->min_uA;
85	int sel = 0;
86
87	while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA)
88	sel++;
89
90	if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA)
91	return -EINVAL;
92
93	sel += 2;
94
95	return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel);
96	}
97
98	static struct regulator_ops max77843_charger_ops = {
99	.is_enabled = max77843_reg_is_enabled,
100	.enable = regulator_enable_regmap,
101	.disable = regulator_disable_regmap,
102	.get_current_limit = max77843_reg_get_current_limit,
103	.set_current_limit = max77843_reg_set_current_limit,
104	};
105
106	static struct regulator_ops max77843_regulator_ops = {
107	.is_enabled = regulator_is_enabled_regmap,
108	.enable = regulator_enable_regmap,
109	.disable = regulator_disable_regmap,
110	.list_voltage = regulator_list_voltage_table,
111	.get_voltage_sel = regulator_get_voltage_sel_regmap,
112	.set_voltage_sel = regulator_set_voltage_sel_regmap,
113	};
114
115	static const struct regulator_desc max77843_supported_regulators[] = {
116	[MAX77843_SAFEOUT1] = {
117	.name = "SAFEOUT1",
118	.id = MAX77843_SAFEOUT1,
119	.ops = &max77843_regulator_ops,
120	.of_match = of_match_ptr("SAFEOUT1"),
121	.regulators_node = of_match_ptr("regulators"),
122	.type = REGULATOR_VOLTAGE,
123	.owner = THIS_MODULE,
124	.n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
125	.volt_table = max77843_safeout_voltage_table,
126	.enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
127	.enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1,
128	.vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
129	.vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK,
130	},
131	[MAX77843_SAFEOUT2] = {
132	.name = "SAFEOUT2",
133	.id = MAX77843_SAFEOUT2,
134	.ops = &max77843_regulator_ops,
135	.of_match = of_match_ptr("SAFEOUT2"),
136	.regulators_node = of_match_ptr("regulators"),
137	.type = REGULATOR_VOLTAGE,
138	.owner = THIS_MODULE,
139	.n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table),
140	.volt_table = max77843_safeout_voltage_table,
141	.enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
142	.enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2,
143	.vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL,
144	.vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK,
145	},
146	[MAX77843_CHARGER] = {
147	.name = "CHARGER",
148	.id = MAX77843_CHARGER,
149	.ops = &max77843_charger_ops,
150	.of_match = of_match_ptr("CHARGER"),
151	.regulators_node = of_match_ptr("regulators"),
152	.type = REGULATOR_CURRENT,
153	.owner = THIS_MODULE,
154	.enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,
155	.enable_mask = MAX77843_CHG_MASK,
156	},
157	};
158
159	static struct regmap max77843_get_regmap(struct max77843 max77843, int reg_id)
160	{
161	switch (reg_id) {
162	case MAX77843_SAFEOUT1:
163	case MAX77843_SAFEOUT2:
164	return max77843->regmap;
165	case MAX77843_CHARGER:
166	return max77843->regmap_chg;
167	default:
168	return max77843->regmap;
169	}
170	}
171
172	static int max77843_regulator_probe(struct platform_device *pdev)
173	{
174	struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
175	struct regulator_config config = {};
176	int i;
177
178	config.dev = max77843->dev;
179	config.driver_data = max77843;
180
181	for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) {
182	struct regulator_dev *regulator;
183
184	config.regmap = max77843_get_regmap(max77843,
185	max77843_supported_regulators[i].id);
186
187	regulator = devm_regulator_register(&pdev->dev,
188	&max77843_supported_regulators[i], &config);
189	if (IS_ERR(regulator)) {
190	dev_err(&pdev->dev,
191	"Failed to regiser regulator-%d\n", i);
192	return PTR_ERR(regulator);
193	}
194	}
195
196	return 0;
197	}
198
199	static const struct platform_device_id max77843_regulator_id[] = {
200	{ "max77843-regulator", },
201	{ /* sentinel */ },
202	};
203
204	static struct platform_driver max77843_regulator_driver = {
205	.driver = {
206	.name = "max77843-regulator",
207	},
208	.probe = max77843_regulator_probe,
209	.id_table = max77843_regulator_id,
210	};
211
212	static int __init max77843_regulator_init(void)
213	{
214	return platform_driver_register(&max77843_regulator_driver);
215	}
216	subsys_initcall(max77843_regulator_init);
217
218	static void __exit max77843_regulator_exit(void)
219	{
220	platform_driver_unregister(&max77843_regulator_driver);
221	}
222	module_exit(max77843_regulator_exit);
223
224	MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
225	MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
226	MODULE_DESCRIPTION("Maxim MAX77843 regulator driver");
227	MODULE_LICENSE("GPL");