summaryrefslogtreecommitdiff
path: root/drivers/regulator/max77693-regulator.c
blob: 72a67d0c5f1e892db0498f1e87ccaf8f6bfaa7bc (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
302
303
304
305
// SPDX-License-Identifier: GPL-2.0+
//
// max77693.c - Regulator driver for the Maxim 77693 and 77843
//
// Copyright (C) 2013-2015 Samsung Electronics
// Jonghwa Lee <jonghwa3.lee@samsung.com>
// Krzysztof Kozlowski <krzk@kernel.org>
//
// 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-common.h>
#include <linux/mfd/max77693-private.h>
#include <linux/mfd/max77843-private.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regmap.h>

/*
 * ID for MAX77843 regulators.
 * There is no need for such for MAX77693.
 */
enum max77843_regulator_type {
	MAX77843_SAFEOUT1 = 0,
	MAX77843_SAFEOUT2,
	MAX77843_CHARGER,

	MAX77843_NUM,
};

/* Register differences between chargers: MAX77693 and MAX77843 */
struct chg_reg_data {
	unsigned int linear_reg;
	unsigned int linear_mask;
	unsigned int uA_step;
	unsigned int min_sel;
};

/*
 * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA
 * 0x00, 0x01, 0x2, 0x03	= 60 mA
 * 0x04 ~ 0x7E			= (60 + (X - 3) * 20) mA
 * Actually for MAX77693 the driver manipulates the maximum input current,
 * not the fast charge current (output). This should be fixed.
 *
 * On MAX77843 the calculation formula is the same (except values).
 * Fortunately it properly manipulates the fast charge current.
 */
static int max77693_chg_get_current_limit(struct regulator_dev *rdev)
{
	const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	unsigned int chg_max_uA = rdev->constraints->max_uA;
	unsigned int reg, sel;
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, reg_data->linear_reg, &reg);
	if (ret < 0)
		return ret;

	sel = reg & reg_data->linear_mask;

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

	val = chg_min_uA + reg_data->uA_step * 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)
{
	const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);
	unsigned int chg_min_uA = rdev->constraints->min_uA;
	int sel = 0;

	while (chg_min_uA + reg_data->uA_step * sel < min_uA)
		sel++;

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

	/* the first four codes for charger current are all 60mA */
	sel += reg_data->min_sel;

	return regmap_write(rdev->regmap, reg_data->linear_reg, sel);
}
/* end of CHARGER regulator ops */

/* Returns regmap suitable for given regulator on chosen device */
static struct regmap *max77693_get_regmap(enum max77693_types type,
					  struct max77693_dev *max77693,
					  int reg_id)
{
	if (type == TYPE_MAX77693)
		return max77693->regmap;

	/* Else: TYPE_MAX77843 */
	switch (reg_id) {
	case MAX77843_SAFEOUT1:
	case MAX77843_SAFEOUT2:
		return max77693->regmap;
	case MAX77843_CHARGER:
		return max77693->regmap_chg;
	default:
		return max77693->regmap;
	}
}

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

static const 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 const struct regulator_ops max77693_charger_ops = {
	.is_enabled		= regulator_is_enabled_regmap,
	.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 max77693_regulator_desc_esafeout(_num)	{		\
	.name		= "ESAFEOUT"#_num,			\
	.id		= MAX77693_ESAFEOUT##_num,		\
	.of_match	= of_match_ptr("ESAFEOUT"#_num),	\
	.regulators_node	= of_match_ptr("regulators"),	\
	.n_voltages	= 4,					\
	.ops		= &max77693_safeout_ops,		\
	.type		= REGULATOR_VOLTAGE,			\
	.owner		= THIS_MODULE,				\
	.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 const struct regulator_desc max77693_supported_regulators[] = {
	max77693_regulator_desc_esafeout(1),
	max77693_regulator_desc_esafeout(2),
	{
		.name = "CHARGER",
		.id = MAX77693_CHARGER,
		.of_match = of_match_ptr("CHARGER"),
		.regulators_node = of_match_ptr("regulators"),
		.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,
		.enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,
	},
};

static const struct chg_reg_data max77693_chg_reg_data = {
	.linear_reg	= MAX77693_CHG_REG_CHG_CNFG_09,
	.linear_mask	= CHG_CNFG_09_CHGIN_ILIM_MASK,
	.uA_step	= 20000,
	.min_sel	= 3,
};

#define	max77843_regulator_desc_esafeout(num)	{			\
	.name		= "SAFEOUT" # num,				\
	.id		= MAX77843_SAFEOUT ## num,			\
	.ops		= &max77693_safeout_ops,			\
	.of_match	= of_match_ptr("SAFEOUT" # num),		\
	.regulators_node = of_match_ptr("regulators"),			\
	.type		= REGULATOR_VOLTAGE,				\
	.owner		= THIS_MODULE,					\
	.n_voltages	= ARRAY_SIZE(max77693_safeout_table),		\
	.volt_table	= max77693_safeout_table,			\
	.enable_reg	= MAX77843_SYS_REG_SAFEOUTCTRL,			\
	.enable_mask	= MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num,	\
	.vsel_reg	= MAX77843_SYS_REG_SAFEOUTCTRL,			\
	.vsel_mask	= MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \
}

static const struct regulator_desc max77843_supported_regulators[] = {
	[MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),
	[MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),
	[MAX77843_CHARGER] = {
		.name		= "CHARGER",
		.id		= MAX77843_CHARGER,
		.ops		= &max77693_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,
		.enable_val	= MAX77843_CHG_MASK,
	},
};

static const struct chg_reg_data max77843_chg_reg_data = {
	.linear_reg	= MAX77843_CHG_REG_CHG_CNFG_02,
	.linear_mask	= MAX77843_CHG_FAST_CHG_CURRENT_MASK,
	.uA_step	= MAX77843_CHG_FAST_CHG_CURRENT_STEP,
	.min_sel	= 2,
};

static int max77693_pmic_probe(struct platform_device *pdev)
{
	enum max77693_types type = platform_get_device_id(pdev)->driver_data;
	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	const struct regulator_desc *regulators;
	unsigned int regulators_size;
	int i;
	struct regulator_config config = { };

	config.dev = iodev->dev;

	switch (type) {
	case TYPE_MAX77693:
		regulators = max77693_supported_regulators;
		regulators_size = ARRAY_SIZE(max77693_supported_regulators);
		config.driver_data = (void *)&max77693_chg_reg_data;
		break;
	case TYPE_MAX77843:
		regulators = max77843_supported_regulators;
		regulators_size = ARRAY_SIZE(max77843_supported_regulators);
		config.driver_data = (void *)&max77843_chg_reg_data;
		break;
	default:
		dev_err(&pdev->dev, "Unsupported device type: %u\n", type);
		return -ENODEV;
	}

	for (i = 0; i < regulators_size; i++) {
		struct regulator_dev *rdev;

		config.regmap = max77693_get_regmap(type, iodev,
						    regulators[i].id);

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

	return 0;
}

static const struct platform_device_id max77693_pmic_id[] = {
	{ "max77693-pmic", TYPE_MAX77693 },
	{ "max77843-regulator", TYPE_MAX77843 },
	{},
};

MODULE_DEVICE_TABLE(platform, max77693_pmic_id);

static struct platform_driver max77693_pmic_driver = {
	.driver = {
		   .name = "max77693-pmic",
		   .probe_type = PROBE_PREFER_ASYNCHRONOUS,
		   },
	.probe = max77693_pmic_probe,
	.id_table = max77693_pmic_id,
};

static int __init max77693_pmic_init(void)
{
	return platform_driver_register(&max77693_pmic_driver);
}
subsys_initcall(max77693_pmic_init);

static void __exit max77693_pmic_cleanup(void)
{
	platform_driver_unregister(&max77693_pmic_driver);
}
module_exit(max77693_pmic_cleanup);

MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");
MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
MODULE_LICENSE("GPL");