1 // SPDX-License-Identifier: GPL-2.0-only
3 * Device driver for RT5739 regulator
5 * Copyright (C) 2023 Richtek Technology Corp.
7 * Author: ChiYuan Huang <cy_huang@richtek.com>
10 #include <linux/bits.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/i2c.h>
13 #include <linux/kernel.h>
14 #include <linux/mod_devicetable.h>
15 #include <linux/property.h>
16 #include <linux/regmap.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/of_regulator.h>
20 #define RT5739_AUTO_MODE 0
21 #define RT5739_FPWM_MODE 1
23 #define RT5739_REG_NSEL0 0x00
24 #define RT5739_REG_NSEL1 0x01
25 #define RT5739_REG_CNTL1 0x02
26 #define RT5739_REG_ID1 0x03
27 #define RT5739_REG_CNTL2 0x06
28 #define RT5739_REG_CNTL4 0x08
30 #define RT5739_VSEL_MASK GENMASK(7, 0)
31 #define RT5739_MODEVSEL1_MASK BIT(1)
32 #define RT5739_MODEVSEL0_MASK BIT(0)
33 #define RT5739_VID_MASK GENMASK(7, 5)
34 #define RT5739_DID_MASK GENMASK(3, 0)
35 #define RT5739_ACTD_MASK BIT(7)
36 #define RT5739_ENVSEL1_MASK BIT(1)
37 #define RT5739_ENVSEL0_MASK BIT(0)
39 #define RT5733_CHIPDIE_ID 0x1
40 #define RT5733_VOLT_MINUV 270000
41 #define RT5733_VOLT_MAXUV 1401250
42 #define RT5733_VOLT_STPUV 6250
43 #define RT5733_N_VOLTS 182
45 #define RT5739_VOLT_MINUV 300000
46 #define RT5739_VOLT_MAXUV 1300000
47 #define RT5739_VOLT_STPUV 5000
48 #define RT5739_N_VOLTS 201
49 #define RT5739_I2CRDY_TIMEUS 1000
51 static int rt5739_set_mode(struct regulator_dev *rdev, unsigned int mode)
53 const struct regulator_desc *desc = rdev->desc;
54 struct regmap *regmap = rdev_get_regmap(rdev);
55 unsigned int mask, val;
57 if (desc->vsel_reg == RT5739_REG_NSEL0)
58 mask = RT5739_MODEVSEL0_MASK;
60 mask = RT5739_MODEVSEL1_MASK;
63 case REGULATOR_MODE_FAST:
66 case REGULATOR_MODE_NORMAL:
73 return regmap_update_bits(regmap, RT5739_REG_CNTL1, mask, val);
76 static unsigned int rt5739_get_mode(struct regulator_dev *rdev)
78 const struct regulator_desc *desc = rdev->desc;
79 struct regmap *regmap = rdev_get_regmap(rdev);
80 unsigned int mask, val;
83 if (desc->vsel_reg == RT5739_REG_NSEL0)
84 mask = RT5739_MODEVSEL0_MASK;
86 mask = RT5739_MODEVSEL1_MASK;
88 ret = regmap_read(regmap, RT5739_REG_CNTL1, &val);
90 return REGULATOR_MODE_INVALID;
93 return REGULATOR_MODE_FAST;
95 return REGULATOR_MODE_NORMAL;
98 static int rt5739_set_suspend_voltage(struct regulator_dev *rdev, int uV)
100 const struct regulator_desc *desc = rdev->desc;
101 struct regmap *regmap = rdev_get_regmap(rdev);
102 unsigned int reg, vsel;
105 max_uV = desc->min_uV + desc->uV_step * (desc->n_voltages - 1);
107 if (uV < desc->min_uV || uV > max_uV)
110 if (desc->vsel_reg == RT5739_REG_NSEL0)
111 reg = RT5739_REG_NSEL1;
113 reg = RT5739_REG_NSEL0;
115 vsel = (uV - desc->min_uV) / desc->uV_step;
116 return regmap_write(regmap, reg, vsel);
119 static int rt5739_set_suspend_enable(struct regulator_dev *rdev)
121 const struct regulator_desc *desc = rdev->desc;
122 struct regmap *regmap = rdev_get_regmap(rdev);
125 if (desc->vsel_reg == RT5739_REG_NSEL0)
126 mask = RT5739_ENVSEL1_MASK;
128 mask = RT5739_ENVSEL0_MASK;
130 return regmap_update_bits(regmap, desc->enable_reg, mask, mask);
133 static int rt5739_set_suspend_disable(struct regulator_dev *rdev)
135 const struct regulator_desc *desc = rdev->desc;
136 struct regmap *regmap = rdev_get_regmap(rdev);
139 if (desc->vsel_reg == RT5739_REG_NSEL0)
140 mask = RT5739_ENVSEL1_MASK;
142 mask = RT5739_ENVSEL0_MASK;
144 return regmap_update_bits(regmap, desc->enable_reg, mask, 0);
147 static int rt5739_set_suspend_mode(struct regulator_dev *rdev,
150 const struct regulator_desc *desc = rdev->desc;
151 struct regmap *regmap = rdev_get_regmap(rdev);
152 unsigned int mask, val;
154 if (desc->vsel_reg == RT5739_REG_NSEL0)
155 mask = RT5739_MODEVSEL1_MASK;
157 mask = RT5739_MODEVSEL0_MASK;
160 case REGULATOR_MODE_FAST:
163 case REGULATOR_MODE_NORMAL:
170 return regmap_update_bits(regmap, RT5739_REG_CNTL1, mask, val);
173 static const struct regulator_ops rt5739_regulator_ops = {
174 .list_voltage = regulator_list_voltage_linear,
175 .get_voltage_sel = regulator_get_voltage_sel_regmap,
176 .set_voltage_sel = regulator_set_voltage_sel_regmap,
177 .enable = regulator_enable_regmap,
178 .disable = regulator_disable_regmap,
179 .is_enabled = regulator_is_enabled_regmap,
180 .set_active_discharge = regulator_set_active_discharge_regmap,
181 .set_mode = rt5739_set_mode,
182 .get_mode = rt5739_get_mode,
183 .set_suspend_voltage = rt5739_set_suspend_voltage,
184 .set_suspend_enable = rt5739_set_suspend_enable,
185 .set_suspend_disable = rt5739_set_suspend_disable,
186 .set_suspend_mode = rt5739_set_suspend_mode,
189 static unsigned int rt5739_of_map_mode(unsigned int mode)
192 case RT5739_AUTO_MODE:
193 return REGULATOR_MODE_NORMAL;
194 case RT5739_FPWM_MODE:
195 return REGULATOR_MODE_FAST;
197 return REGULATOR_MODE_INVALID;
201 static void rt5739_init_regulator_desc(struct regulator_desc *desc,
202 bool vsel_active_high, u8 did)
205 desc->name = "rt5739-regulator";
206 desc->owner = THIS_MODULE;
207 desc->ops = &rt5739_regulator_ops;
208 desc->vsel_mask = RT5739_VSEL_MASK;
209 desc->enable_reg = RT5739_REG_CNTL2;
210 desc->active_discharge_reg = RT5739_REG_CNTL1;
211 desc->active_discharge_mask = RT5739_ACTD_MASK;
212 desc->active_discharge_on = RT5739_ACTD_MASK;
213 desc->of_map_mode = rt5739_of_map_mode;
215 /* Assigned by vsel level */
216 if (vsel_active_high) {
217 desc->vsel_reg = RT5739_REG_NSEL1;
218 desc->enable_mask = RT5739_ENVSEL1_MASK;
220 desc->vsel_reg = RT5739_REG_NSEL0;
221 desc->enable_mask = RT5739_ENVSEL0_MASK;
224 /* Assigned by CHIPDIE ID */
226 case RT5733_CHIPDIE_ID:
227 desc->n_voltages = RT5733_N_VOLTS;
228 desc->min_uV = RT5733_VOLT_MINUV;
229 desc->uV_step = RT5733_VOLT_STPUV;
232 desc->n_voltages = RT5739_N_VOLTS;
233 desc->min_uV = RT5739_VOLT_MINUV;
234 desc->uV_step = RT5739_VOLT_STPUV;
239 static const struct regmap_config rt5739_regmap_config = {
243 .max_register = RT5739_REG_CNTL4,
246 static int rt5739_probe(struct i2c_client *i2c)
248 struct device *dev = &i2c->dev;
249 struct regulator_desc *desc;
250 struct regmap *regmap;
251 struct gpio_desc *enable_gpio;
252 struct regulator_config cfg = {};
253 struct regulator_dev *rdev;
258 desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
262 enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
263 if (IS_ERR(enable_gpio))
264 return dev_err_probe(dev, PTR_ERR(enable_gpio), "Failed to get 'enable' gpio\n");
265 else if (enable_gpio)
266 usleep_range(RT5739_I2CRDY_TIMEUS, RT5739_I2CRDY_TIMEUS + 1000);
268 regmap = devm_regmap_init_i2c(i2c, &rt5739_regmap_config);
270 return dev_err_probe(dev, PTR_ERR(regmap), "Failed to init regmap\n");
272 ret = regmap_read(regmap, RT5739_REG_ID1, &vid);
274 return dev_err_probe(dev, ret, "Failed to read VID\n");
276 /* RT5739: (VID & MASK) must be 0 */
277 if (vid & RT5739_VID_MASK)
278 return dev_err_probe(dev, -ENODEV, "Incorrect VID (0x%02x)\n", vid);
280 vsel_acth = device_property_read_bool(dev, "richtek,vsel-active-high");
282 rt5739_init_regulator_desc(desc, vsel_acth, vid & RT5739_DID_MASK);
285 cfg.of_node = dev_of_node(dev);
286 cfg.init_data = of_get_regulator_init_data(dev, dev_of_node(dev), desc);
287 rdev = devm_regulator_register(dev, desc, &cfg);
289 return dev_err_probe(dev, PTR_ERR(rdev), "Failed to register regulator\n");
294 static const struct of_device_id rt5739_device_table[] = {
295 { .compatible = "richtek,rt5733" },
296 { .compatible = "richtek,rt5739" },
299 MODULE_DEVICE_TABLE(of, rt5739_device_table);
301 static struct i2c_driver rt5739_driver = {
304 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
305 .of_match_table = rt5739_device_table,
307 .probe = rt5739_probe,
309 module_i2c_driver(rt5739_driver);
311 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
312 MODULE_DESCRIPTION("Richtek RT5739 regulator driver");
313 MODULE_LICENSE("GPL");