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