summaryrefslogtreecommitdiff
path: root/drivers/regulator/sy8827n.c
blob: 7d5d9f879ce3c05971088f50d72d239d33d87600 (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
// SPDX-License-Identifier: GPL-2.0
//
// SY8827N regulator driver
//
// Copyright (C) 2020 Synaptics Incorporated
//
// Author: Jisheng Zhang <jszhang@kernel.org>

#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>

#define SY8827N_VSEL0		0
#define   SY8827N_BUCK_EN	(1 << 7)
#define   SY8827N_MODE		(1 << 6)
#define SY8827N_VSEL1		1
#define SY8827N_CTRL		2
#define SY8827N_ID1		3
#define SY8827N_ID2		4
#define SY8827N_PGOOD		5
#define SY8827N_MAX		(SY8827N_PGOOD + 1)

#define SY8827N_NVOLTAGES	64
#define SY8827N_VSELMIN		600000
#define SY8827N_VSELSTEP	12500

struct sy8827n_device_info {
	struct device *dev;
	struct regulator_desc desc;
	struct regulator_init_data *regulator;
	struct gpio_desc *en_gpio;
	unsigned int vsel_reg;
};

static int sy8827n_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(rdev->regmap, di->vsel_reg,
				   SY8827N_MODE, SY8827N_MODE);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(rdev->regmap, di->vsel_reg,
				   SY8827N_MODE, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int sy8827n_get_mode(struct regulator_dev *rdev)
{
	struct sy8827n_device_info *di = rdev_get_drvdata(rdev);
	u32 val;
	int ret = 0;

	ret = regmap_read(rdev->regmap, di->vsel_reg, &val);
	if (ret < 0)
		return ret;
	if (val & SY8827N_MODE)
		return REGULATOR_MODE_FAST;
	else
		return REGULATOR_MODE_NORMAL;
}

static const struct regulator_ops sy8827n_regulator_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.set_voltage_time_sel = regulator_set_voltage_time_sel,
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.set_mode = sy8827n_set_mode,
	.get_mode = sy8827n_get_mode,
};

static int sy8827n_regulator_register(struct sy8827n_device_info *di,
			struct regulator_config *config)
{
	struct regulator_desc *rdesc = &di->desc;
	struct regulator_dev *rdev;

	rdesc->name = "sy8827n-reg";
	rdesc->supply_name = "vin";
	rdesc->ops = &sy8827n_regulator_ops;
	rdesc->type = REGULATOR_VOLTAGE;
	rdesc->n_voltages = SY8827N_NVOLTAGES;
	rdesc->enable_reg = di->vsel_reg;
	rdesc->enable_mask = SY8827N_BUCK_EN;
	rdesc->min_uV = SY8827N_VSELMIN;
	rdesc->uV_step = SY8827N_VSELSTEP;
	rdesc->vsel_reg = di->vsel_reg;
	rdesc->vsel_mask = rdesc->n_voltages - 1;
	rdesc->owner = THIS_MODULE;

	rdev = devm_regulator_register(di->dev, &di->desc, config);
	return PTR_ERR_OR_ZERO(rdev);
}

static bool sy8827n_volatile_reg(struct device *dev, unsigned int reg)
{
	if (reg == SY8827N_PGOOD)
		return true;
	return false;
}

static const struct regmap_config sy8827n_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.volatile_reg = sy8827n_volatile_reg,
	.num_reg_defaults_raw = SY8827N_MAX,
	.cache_type = REGCACHE_FLAT,
};

static int sy8827n_i2c_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct device_node *np = dev->of_node;
	struct sy8827n_device_info *di;
	struct regulator_config config = { };
	struct regmap *regmap;
	int ret;

	di = devm_kzalloc(dev, sizeof(struct sy8827n_device_info), GFP_KERNEL);
	if (!di)
		return -ENOMEM;

	di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
	if (!di->regulator) {
		dev_err(dev, "Platform data not found!\n");
		return -EINVAL;
	}

	di->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
	if (IS_ERR(di->en_gpio))
		return PTR_ERR(di->en_gpio);

	if (of_property_read_bool(np, "silergy,vsel-state-high"))
		di->vsel_reg = SY8827N_VSEL1;
	else
		di->vsel_reg = SY8827N_VSEL0;

	di->dev = dev;

	regmap = devm_regmap_init_i2c(client, &sy8827n_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(dev, "Failed to allocate regmap!\n");
		return PTR_ERR(regmap);
	}
	i2c_set_clientdata(client, di);

	config.dev = di->dev;
	config.init_data = di->regulator;
	config.regmap = regmap;
	config.driver_data = di;
	config.of_node = np;

	ret = sy8827n_regulator_register(di, &config);
	if (ret < 0)
		dev_err(dev, "Failed to register regulator!\n");
	return ret;
}

#ifdef CONFIG_OF
static const struct of_device_id sy8827n_dt_ids[] = {
	{
		.compatible = "silergy,sy8827n",
	},
	{ }
};
MODULE_DEVICE_TABLE(of, sy8827n_dt_ids);
#endif

static const struct i2c_device_id sy8827n_id[] = {
	{ "sy8827n", },
	{ },
};
MODULE_DEVICE_TABLE(i2c, sy8827n_id);

static struct i2c_driver sy8827n_regulator_driver = {
	.driver = {
		.name = "sy8827n-regulator",
		.of_match_table = of_match_ptr(sy8827n_dt_ids),
	},
	.probe_new = sy8827n_i2c_probe,
	.id_table = sy8827n_id,
};
module_i2c_driver(sy8827n_regulator_driver);

MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
MODULE_DESCRIPTION("SY8827N regulator driver");
MODULE_LICENSE("GPL v2");