[mirror_ubuntu-zesty-kernel.git] / drivers / regulator / max14577.c

/*
 * max14577.c - Regulator driver for the Maxim 14577
 *
 * Copyright (C) 2013,2014 Samsung Electronics
 * Krzysztof Kozlowski <k.kozlowski@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.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/mfd/max14577.h>
#include <linux/mfd/max14577-private.h>
#include <linux/regulator/of_regulator.h>

static int max14577_reg_is_enabled(struct regulator_dev *rdev)
{
	int rid = rdev_get_id(rdev);
	struct regmap *rmap = rdev->regmap;
	u8 reg_data;

	switch (rid) {
	case MAX14577_CHARGER:
		max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
		if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
			return 0;
		max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
		if ((reg_data & STATUS3_CGMBC_MASK) == 0)
			return 0;
		/* MBCHOSTEN and CGMBC are on */
		return 1;
	default:
		return -EINVAL;
	}
}

static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
{
	u8 reg_data;
	struct regmap *rmap = rdev->regmap;

	if (rdev_get_id(rdev) != MAX14577_CHARGER)
		return -EINVAL;

	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);

	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
		return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;

	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
			CHGCTRL4_MBCICHWRCH_SHIFT);
	return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
		reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
}

static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
		int min_uA, int max_uA)
{
	int i, current_bits = 0xf;
	u8 reg_data;

	if (rdev_get_id(rdev) != MAX14577_CHARGER)
		return -EINVAL;

	if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX ||
			max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
		return -EINVAL;

	if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
		/* Less than 200 mA, so set 90mA (turn only Low Bit off) */
		u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
		return max14577_update_reg(rdev->regmap,
				MAX14577_CHG_REG_CHG_CTRL4,
				CHGCTRL4_MBCICHWRCL_MASK, reg_data);
	}

	/* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
	 * valid current starting from LIMIT_MAX. */
	for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
			i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
			i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
		if (i <= max_uA)
			break;
		current_bits--;
	}
	BUG_ON(current_bits < 0); /* Cannot happen */
	/* Turn Low Bit on (use range 200mA-950 mA) */
	reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
	/* and set proper High Bits */
	reg_data |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;

	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
			CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
			reg_data);
}

static struct regulator_ops max14577_safeout_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

static struct regulator_ops max14577_charger_ops = {
	.is_enabled		= max14577_reg_is_enabled,
	.enable			= regulator_enable_regmap,
	.disable		= regulator_disable_regmap,
	.get_current_limit	= max14577_reg_get_current_limit,
	.set_current_limit	= max14577_reg_set_current_limit,
};

static const struct regulator_desc supported_regulators[] = {
	[MAX14577_SAFEOUT] = {
		.name		= "SAFEOUT",
		.id		= MAX14577_SAFEOUT,
		.ops		= &max14577_safeout_ops,
		.type		= REGULATOR_VOLTAGE,
		.owner		= THIS_MODULE,
		.n_voltages	= 1,
		.min_uV		= MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
		.enable_reg	= MAX14577_REG_CONTROL2,
		.enable_mask	= CTRL2_SFOUTORD_MASK,
	},
	[MAX14577_CHARGER] = {
		.name		= "CHARGER",
		.id		= MAX14577_CHARGER,
		.ops		= &max14577_charger_ops,
		.type		= REGULATOR_CURRENT,
		.owner		= THIS_MODULE,
		.enable_reg	= MAX14577_CHG_REG_CHG_CTRL2,
		.enable_mask	= CHGCTRL2_MBCHOSTEN_MASK,
	},
};

#ifdef CONFIG_OF
static struct of_regulator_match max14577_regulator_matches[] = {
	{ .name	= "SAFEOUT", },
	{ .name = "CHARGER", },
};

static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
{
	int ret;
	struct device_node *np;

	np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
	if (!np) {
		dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
		return -EINVAL;
	}

	ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
			MAX14577_REG_MAX);
	if (ret < 0)
		dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
	else
		ret = 0;

	of_node_put(np);

	return ret;
}

static inline struct regulator_init_data *match_init_data(int index)
{
	return max14577_regulator_matches[index].init_data;
}

static inline struct device_node *match_of_node(int index)
{
	return max14577_regulator_matches[index].of_node;
}
#else /* CONFIG_OF */
static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
{
	return 0;
}
static inline struct regulator_init_data *match_init_data(int index)
{
	return NULL;
}

static inline struct device_node *match_of_node(int index)
{
	return NULL;
}
#endif /* CONFIG_OF */


static int max14577_regulator_probe(struct platform_device *pdev)
{
	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
	int i, ret;
	struct regulator_config config = {};

	ret = max14577_regulator_dt_parse_pdata(pdev);
	if (ret)
		return ret;

	config.dev = &pdev->dev;
	config.regmap = max14577->regmap;

	for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
		struct regulator_dev *regulator;
		/*
		 * Index of supported_regulators[] is also the id and must
		 * match index of pdata->regulators[].
		 */
		if (pdata && pdata->regulators) {
			config.init_data = pdata->regulators[i].initdata;
			config.of_node = pdata->regulators[i].of_node;
		} else {
			config.init_data = match_init_data(i);
			config.of_node = match_of_node(i);
		}

		regulator = devm_regulator_register(&pdev->dev,
				&supported_regulators[i], &config);
		if (IS_ERR(regulator)) {
			ret = PTR_ERR(regulator);
			dev_err(&pdev->dev,
					"Regulator init failed for ID %d with error: %d\n",
					i, ret);
			return ret;
		}
	}

	return ret;
}

static struct platform_driver max14577_regulator_driver = {
	.driver = {
		   .owner = THIS_MODULE,
		   .name = "max14577-regulator",
		   },
	.probe	= max14577_regulator_probe,
};

static int __init max14577_regulator_init(void)
{
	BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
			MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
			MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
	BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);

	return platform_driver_register(&max14577_regulator_driver);
}
subsys_initcall(max14577_regulator_init);

static void __exit max14577_regulator_exit(void)
{
	platform_driver_unregister(&max14577_regulator_driver);
}
module_exit(max14577_regulator_exit);

MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max14577-regulator");
Commit	Line	Data
b0902bbe KK	1	/*
	2	* max14577.c - Regulator driver for the Maxim 14577
	3	*
4d047d6c	4	* Copyright (C) 2013,2014 Samsung Electronics
b0902bbe KK	5	* Krzysztof Kozlowski <k.kozlowski@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
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regulator/driver.h>
	21	#include <linux/mfd/max14577.h>
	22	#include <linux/mfd/max14577-private.h>
	23	#include <linux/regulator/of_regulator.h>
	24
b0902bbe KK	25	static int max14577_reg_is_enabled(struct regulator_dev *rdev)
	26	{
	27	int rid = rdev_get_id(rdev);
	28	struct regmap *rmap = rdev->regmap;
	29	u8 reg_data;
	30
	31	switch (rid) {
	32	case MAX14577_CHARGER:
	33	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
	34	if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
	35	return 0;
	36	max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
	37	if ((reg_data & STATUS3_CGMBC_MASK) == 0)
	38	return 0;
	39	/* MBCHOSTEN and CGMBC are on */
	40	return 1;
	41	default:
	42	return -EINVAL;
	43	}
	44	}
	45
	46	static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
	47	{
	48	u8 reg_data;
	49	struct regmap *rmap = rdev->regmap;
	50
	51	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	52	return -EINVAL;
	53
	54	max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
	55
	56	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
	57	return MAX14577_REGULATOR_CURRENT_LIMIT_MIN;
	58
	59	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
	60	CHGCTRL4_MBCICHWRCH_SHIFT);
	61	return MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
	62	reg_data * MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP;
	63	}
	64
	65	static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
	66	int min_uA, int max_uA)
	67	{
	68	int i, current_bits = 0xf;
	69	u8 reg_data;
	70
	71	if (rdev_get_id(rdev) != MAX14577_CHARGER)
	72	return -EINVAL;
	73
	74	if (min_uA > MAX14577_REGULATOR_CURRENT_LIMIT_MAX \|\|
	75	max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_MIN)
	76	return -EINVAL;
	77
	78	if (max_uA < MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START) {
	79	/* Less than 200 mA, so set 90mA (turn only Low Bit off) */
	80	u8 reg_data = 0x0 << CHGCTRL4_MBCICHWRCL_SHIFT;
	81	return max14577_update_reg(rdev->regmap,
	82	MAX14577_CHG_REG_CHG_CTRL4,
	83	CHGCTRL4_MBCICHWRCL_MASK, reg_data);
	84	}
	85
	86	/* max_uA is in range: <LIMIT_HIGH_START, inifinite>, so search for
	87	* valid current starting from LIMIT_MAX. */
	88	for (i = MAX14577_REGULATOR_CURRENT_LIMIT_MAX;
89	i >= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START;
90	i -= MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP) {
91	if (i <= max_uA)
92	break;
93	current_bits--;
94	}
95	BUG_ON(current_bits < 0); /* Cannot happen */
96	/* Turn Low Bit on (use range 200mA-950 mA) */
97	reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
98	/* and set proper High Bits */
99	reg_data \|= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
100
101	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
102	CHGCTRL4_MBCICHWRCL_MASK \| CHGCTRL4_MBCICHWRCH_MASK,
103	reg_data);
104	}
105
106	static struct regulator_ops max14577_safeout_ops = {
107	.is_enabled = regulator_is_enabled_regmap,
108	.enable = regulator_enable_regmap,
109	.disable = regulator_disable_regmap,
110	.list_voltage = regulator_list_voltage_linear,
111	};
112
113	static struct regulator_ops max14577_charger_ops = {
114	.is_enabled = max14577_reg_is_enabled,
115	.enable = regulator_enable_regmap,
116	.disable = regulator_disable_regmap,
117	.get_current_limit = max14577_reg_get_current_limit,
118	.set_current_limit = max14577_reg_set_current_limit,
119	};
120
121	static const struct regulator_desc supported_regulators[] = {
122	[MAX14577_SAFEOUT] = {
123	.name = "SAFEOUT",
124	.id = MAX14577_SAFEOUT,
125	.ops = &max14577_safeout_ops,
126	.type = REGULATOR_VOLTAGE,
127	.owner = THIS_MODULE,
128	.n_voltages = 1,
129	.min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
130	.enable_reg = MAX14577_REG_CONTROL2,
131	.enable_mask = CTRL2_SFOUTORD_MASK,
132	},
133	[MAX14577_CHARGER] = {
134	.name = "CHARGER",
135	.id = MAX14577_CHARGER,
136	.ops = &max14577_charger_ops,
137	.type = REGULATOR_CURRENT,
138	.owner = THIS_MODULE,
139	.enable_reg = MAX14577_CHG_REG_CHG_CTRL2,
140	.enable_mask = CHGCTRL2_MBCHOSTEN_MASK,
141	},
142	};
143
144	#ifdef CONFIG_OF
145	static struct of_regulator_match max14577_regulator_matches[] = {
146	{ .name = "SAFEOUT", },
147	{ .name = "CHARGER", },
148	};
149
150	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
151	{
152	int ret;
153	struct device_node *np;
154
155	np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators");
156	if (!np) {
157	dev_err(&pdev->dev, "Failed to get child OF node for regulators\n");
158	return -EINVAL;
159	}
160
161	ret = of_regulator_match(&pdev->dev, np, max14577_regulator_matches,
162	MAX14577_REG_MAX);
08221fc4	163	if (ret < 0)
b0902bbe	164	dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret);
08221fc4 KK	165	else
08221fc4 KK	166	ret = 0;
b0902bbe	167
667a6b7a KK	168	of_node_put(np);
	169
	170	return ret;
b0902bbe KK	171	}
	172
	173	static inline struct regulator_init_data *match_init_data(int index)
	174	{
	175	return max14577_regulator_matches[index].init_data;
	176	}
	177
	178	static inline struct device_node *match_of_node(int index)
	179	{
	180	return max14577_regulator_matches[index].of_node;
	181	}
	182	#else /* CONFIG_OF */
	183	static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev)
	184	{
	185	return 0;
	186	}
	187	static inline struct regulator_init_data *match_init_data(int index)
	188	{
	189	return NULL;
	190	}
	191
	192	static inline struct device_node *match_of_node(int index)
	193	{
	194	return NULL;
	195	}
	196	#endif /* CONFIG_OF */
	197
	198
	199	static int max14577_regulator_probe(struct platform_device *pdev)
	200	{
	201	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
	202	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
	203	int i, ret;
	204	struct regulator_config config = {};
	205
	206	ret = max14577_regulator_dt_parse_pdata(pdev);
	207	if (ret)
	208	return ret;
	209
	210	config.dev = &pdev->dev;
	211	config.regmap = max14577->regmap;
	212
	213	for (i = 0; i < ARRAY_SIZE(supported_regulators); i++) {
	214	struct regulator_dev *regulator;
	215	/*
	216	* Index of supported_regulators[] is also the id and must
	217	* match index of pdata->regulators[].
	218	*/
	219	if (pdata && pdata->regulators) {
	220	config.init_data = pdata->regulators[i].initdata;
	221	config.of_node = pdata->regulators[i].of_node;
	222	} else {
	223	config.init_data = match_init_data(i);
	224	config.of_node = match_of_node(i);
	225	}
	226
	227	regulator = devm_regulator_register(&pdev->dev,
	228	&supported_regulators[i], &config);
	229	if (IS_ERR(regulator)) {
	230	ret = PTR_ERR(regulator);
	231	dev_err(&pdev->dev,
	232	"Regulator init failed for ID %d with error: %d\n",
	233	i, ret);
	234	return ret;
235	}
236	}
237
238	return ret;
239	}
240
241	static struct platform_driver max14577_regulator_driver = {
242	.driver = {
243	.owner = THIS_MODULE,
244	.name = "max14577-regulator",
245	},
246	.probe = max14577_regulator_probe,
247	};
248
249	static int __init max14577_regulator_init(void)
250	{
251	BUILD_BUG_ON(MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START +
252	MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP * 0xf !=
253	MAX14577_REGULATOR_CURRENT_LIMIT_MAX);
254	BUILD_BUG_ON(ARRAY_SIZE(supported_regulators) != MAX14577_REG_MAX);
255
256	return platform_driver_register(&max14577_regulator_driver);
257	}
258	subsys_initcall(max14577_regulator_init);
259
260	static void __exit max14577_regulator_exit(void)
261	{
262	platform_driver_unregister(&max14577_regulator_driver);
263	}
264	module_exit(max14577_regulator_exit);
265
266	MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
267	MODULE_DESCRIPTION("MAXIM 14577 regulator driver");
268	MODULE_LICENSE("GPL");
9f45a3dd	269	MODULE_ALIAS("platform:max14577-regulator");