summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/max14577.c
blob: e0619526708c88393069abf4411fa2ff9473e510 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
/*
 * max14577.c - Regulator driver for the Maxim 14577
 *
 * Copyright (C) 2013 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>

struct max14577_regulator {
	struct device *dev;
	struct max14577 *max14577;
	struct regulator_dev **regulators;
};

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");