summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/max77693.c
blob: feb20bf4ccab4b056003896773ae86dec5c7219e (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
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/*
 * 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;
	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] = devm_regulator_register(&pdev->dev,
						&regulators[id], &config);
		if (IS_ERR(max77693_pmic->rdev[i])) {
			dev_err(max77693_pmic->dev,
				"Failed to initialize regulator-%d\n", id);
			return PTR_ERR(max77693_pmic->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,
	.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");
OpenPOWER on IntegriCloud