1// SPDX-License-Identifier: GPL-2.0
2//
3// SY8824C/SY8824E regulator driver
4//
5// Copyright (C) 2019 Synaptics Incorporated
6//
7// Author: Jisheng Zhang <jszhang@kernel.org>
8
9#include <linux/module.h>
10#include <linux/i2c.h>
11#include <linux/of.h>
12#include <linux/regmap.h>
13#include <linux/regulator/driver.h>
14#include <linux/regulator/of_regulator.h>
15
16#define SY8824C_BUCK_EN		(1 << 7)
17#define SY8824C_MODE		(1 << 6)
18
19struct sy8824_config {
20	/* registers */
21	unsigned int vol_reg;
22	unsigned int mode_reg;
23	unsigned int enable_reg;
24	/* Voltage range and step(linear) */
25	unsigned int vsel_min;
26	unsigned int vsel_step;
27	unsigned int vsel_count;
28	const struct regmap_config *config;
29};
30
31struct sy8824_device_info {
32	struct device *dev;
33	struct regulator_desc desc;
34	struct regulator_init_data *regulator;
35	const struct sy8824_config *cfg;
36};
37
38static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
39{
40	struct sy8824_device_info *di = rdev_get_drvdata(rdev);
41	const struct sy8824_config *cfg = di->cfg;
42
43	switch (mode) {
44	case REGULATOR_MODE_FAST:
45		regmap_update_bits(rdev->regmap, cfg->mode_reg,
46				   SY8824C_MODE, SY8824C_MODE);
47		break;
48	case REGULATOR_MODE_NORMAL:
49		regmap_update_bits(rdev->regmap, cfg->mode_reg,
50				   SY8824C_MODE, 0);
51		break;
52	default:
53		return -EINVAL;
54	}
55	return 0;
56}
57
58static unsigned int sy8824_get_mode(struct regulator_dev *rdev)
59{
60	struct sy8824_device_info *di = rdev_get_drvdata(rdev);
61	const struct sy8824_config *cfg = di->cfg;
62	u32 val;
63	int ret = 0;
64
65	ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
66	if (ret < 0)
67		return ret;
68	if (val & SY8824C_MODE)
69		return REGULATOR_MODE_FAST;
70	else
71		return REGULATOR_MODE_NORMAL;
72}
73
74static const struct regulator_ops sy8824_regulator_ops = {
75	.set_voltage_sel = regulator_set_voltage_sel_regmap,
76	.get_voltage_sel = regulator_get_voltage_sel_regmap,
77	.set_voltage_time_sel = regulator_set_voltage_time_sel,
78	.map_voltage = regulator_map_voltage_linear,
79	.list_voltage = regulator_list_voltage_linear,
80	.enable = regulator_enable_regmap,
81	.disable = regulator_disable_regmap,
82	.is_enabled = regulator_is_enabled_regmap,
83	.set_mode = sy8824_set_mode,
84	.get_mode = sy8824_get_mode,
85};
86
87static int sy8824_regulator_register(struct sy8824_device_info *di,
88			struct regulator_config *config)
89{
90	struct regulator_desc *rdesc = &di->desc;
91	const struct sy8824_config *cfg = di->cfg;
92	struct regulator_dev *rdev;
93
94	rdesc->name = "sy8824-reg";
95	rdesc->supply_name = "vin";
96	rdesc->ops = &sy8824_regulator_ops;
97	rdesc->type = REGULATOR_VOLTAGE;
98	rdesc->n_voltages = cfg->vsel_count;
99	rdesc->enable_reg = cfg->enable_reg;
100	rdesc->enable_mask = SY8824C_BUCK_EN;
101	rdesc->min_uV = cfg->vsel_min;
102	rdesc->uV_step = cfg->vsel_step;
103	rdesc->vsel_reg = cfg->vol_reg;
104	rdesc->vsel_mask = cfg->vsel_count - 1;
105	rdesc->owner = THIS_MODULE;
106
107	rdev = devm_regulator_register(di->dev, &di->desc, config);
108	return PTR_ERR_OR_ZERO(rdev);
109}
110
111static const struct regmap_config sy8824_regmap_config = {
112	.reg_bits = 8,
113	.val_bits = 8,
114	.num_reg_defaults_raw = 1,
115	.cache_type = REGCACHE_FLAT,
116};
117
118static const struct regmap_config sy20276_regmap_config = {
119	.reg_bits = 8,
120	.val_bits = 8,
121	.num_reg_defaults_raw = 2,
122	.cache_type = REGCACHE_FLAT,
123};
124
125static int sy8824_i2c_probe(struct i2c_client *client)
126{
127	struct device *dev = &client->dev;
128	struct device_node *np = dev->of_node;
129	struct sy8824_device_info *di;
130	struct regulator_config config = { };
131	struct regmap *regmap;
132	int ret;
133
134	di = devm_kzalloc(dev, sizeof(struct sy8824_device_info), GFP_KERNEL);
135	if (!di)
136		return -ENOMEM;
137
138	di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
139	if (!di->regulator) {
140		dev_err(dev, "Platform data not found!\n");
141		return -EINVAL;
142	}
143
144	di->dev = dev;
145	di->cfg = i2c_get_match_data(client);
146
147	regmap = devm_regmap_init_i2c(client, di->cfg->config);
148	if (IS_ERR(regmap)) {
149		dev_err(dev, "Failed to allocate regmap!\n");
150		return PTR_ERR(regmap);
151	}
152	i2c_set_clientdata(client, di);
153
154	config.dev = di->dev;
155	config.init_data = di->regulator;
156	config.regmap = regmap;
157	config.driver_data = di;
158	config.of_node = np;
159
160	ret = sy8824_regulator_register(di, &config);
161	if (ret < 0)
162		dev_err(dev, "Failed to register regulator!\n");
163	return ret;
164}
165
166static const struct sy8824_config sy8824c_cfg = {
167	.vol_reg = 0x00,
168	.mode_reg = 0x00,
169	.enable_reg = 0x00,
170	.vsel_min = 762500,
171	.vsel_step = 12500,
172	.vsel_count = 64,
173	.config = &sy8824_regmap_config,
174};
175
176static const struct sy8824_config sy8824e_cfg = {
177	.vol_reg = 0x00,
178	.mode_reg = 0x00,
179	.enable_reg = 0x00,
180	.vsel_min = 700000,
181	.vsel_step = 12500,
182	.vsel_count = 64,
183	.config = &sy8824_regmap_config,
184};
185
186static const struct sy8824_config sy20276_cfg = {
187	.vol_reg = 0x00,
188	.mode_reg = 0x01,
189	.enable_reg = 0x01,
190	.vsel_min = 600000,
191	.vsel_step = 10000,
192	.vsel_count = 128,
193	.config = &sy20276_regmap_config,
194};
195
196static const struct sy8824_config sy20278_cfg = {
197	.vol_reg = 0x00,
198	.mode_reg = 0x01,
199	.enable_reg = 0x01,
200	.vsel_min = 762500,
201	.vsel_step = 12500,
202	.vsel_count = 64,
203	.config = &sy20276_regmap_config,
204};
205
206static const struct of_device_id sy8824_dt_ids[] = {
207	{ .compatible = "silergy,sy8824c", .data = &sy8824c_cfg },
208	{ .compatible = "silergy,sy8824e", .data = &sy8824e_cfg },
209	{ .compatible = "silergy,sy20276", .data = &sy20276_cfg },
210	{ .compatible = "silergy,sy20278", .data = &sy20278_cfg },
211	{ }
212};
213MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
214
215static const struct i2c_device_id sy8824_id[] = {
216	{ "sy8824", (kernel_ulong_t)&sy8824c_cfg },
217	{ }
218};
219MODULE_DEVICE_TABLE(i2c, sy8824_id);
220
221static struct i2c_driver sy8824_regulator_driver = {
222	.driver = {
223		.name = "sy8824-regulator",
224		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
225		.of_match_table = sy8824_dt_ids,
226	},
227	.probe = sy8824_i2c_probe,
228	.id_table = sy8824_id,
229};
230module_i2c_driver(sy8824_regulator_driver);
231
232MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
233MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
234MODULE_LICENSE("GPL v2");
235