1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2023 Richtek Technology Corp.
4 *
5 * Author: ChiYuan Huang <cy_huang@richtek.com>
6 */
7
8#include <linux/i2c.h>
9#include <linux/kernel.h>
10#include <linux/mod_devicetable.h>
11#include <linux/module.h>
12#include <linux/property.h>
13#include <linux/regmap.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/of_regulator.h>
16
17#define RT4803_AUTO_MODE 1
18#define RT4803_FPWM_MODE 2
19
20#define RT4803_REG_CONFIG 0x01
21#define RT4803_REG_VSELL 0x02
22#define RT4803_REG_VSELH 0x03
23#define RT4803_REG_ILIM 0x04
24#define RT4803_REG_STAT 0x05
25
26#define RT4803_MODE_MASK GENMASK(1, 0)
27#define RT4803_VSEL_MASK GENMASK(4, 0)
28#define RT4803_ILIM_MASK GENMASK(3, 0)
29#define RT4803_TSD_MASK BIT(7)
30#define RT4803_HOTDIE_MASK BIT(6)
31#define RT4803_FAULT_MASK BIT(1)
32#define RT4803_PGOOD_MASK BIT(0)
33
34#define RT4803_VOUT_MINUV 2850000
35#define RT4803_VOUT_STEPUV 50000
36#define RT4803_VOUT_NUM 32
37
38static int rt4803_set_mode(struct regulator_dev *rdev, unsigned int mode)
39{
40 struct regmap *regmap = rdev_get_regmap(rdev);
41 unsigned int modeval;
42
43 switch (mode) {
44 case REGULATOR_MODE_NORMAL:
45 modeval = RT4803_AUTO_MODE;
46 break;
47 case REGULATOR_MODE_FAST:
48 modeval = RT4803_FPWM_MODE;
49 break;
50 default:
51 return -EINVAL;
52 }
53
54 modeval <<= ffs(RT4803_MODE_MASK) - 1;
55
56 return regmap_update_bits(map: regmap, RT4803_REG_CONFIG, RT4803_MODE_MASK, val: modeval);
57}
58
59static unsigned int rt4803_get_mode(struct regulator_dev *rdev)
60{
61 struct regmap *regmap = rdev_get_regmap(rdev);
62 unsigned int modeval;
63 int ret;
64
65 ret = regmap_read(map: regmap, RT4803_REG_CONFIG, val: &modeval);
66 if (ret)
67 return REGULATOR_MODE_INVALID;
68
69 modeval >>= ffs(RT4803_MODE_MASK) - 1;
70
71 switch (modeval) {
72 case RT4803_AUTO_MODE:
73 return REGULATOR_MODE_NORMAL;
74 case RT4803_FPWM_MODE:
75 return REGULATOR_MODE_FAST;
76 default:
77 return REGULATOR_MODE_INVALID;
78 }
79}
80
81static int rt4803_get_error_flags(struct regulator_dev *rdev, unsigned int *flags)
82{
83 struct regmap *regmap = rdev_get_regmap(rdev);
84 unsigned int state, events = 0;
85 int ret;
86
87 ret = regmap_read(map: regmap, RT4803_REG_STAT, val: &state);
88 if (ret)
89 return ret;
90
91 if (state & RT4803_PGOOD_MASK)
92 goto out_error_flag;
93
94 if (state & RT4803_FAULT_MASK)
95 events |= REGULATOR_ERROR_FAIL;
96
97 if (state & RT4803_HOTDIE_MASK)
98 events |= REGULATOR_ERROR_OVER_TEMP_WARN;
99
100 if (state & RT4803_TSD_MASK)
101 events |= REGULATOR_ERROR_OVER_TEMP;
102
103out_error_flag:
104 *flags = events;
105 return 0;
106}
107
108static int rt4803_set_suspend_voltage(struct regulator_dev *rdev, int uV)
109{
110 struct regmap *regmap = rdev_get_regmap(rdev);
111 unsigned int reg, vsel;
112
113 if (rdev->desc->vsel_reg == RT4803_REG_VSELL)
114 reg = RT4803_REG_VSELH;
115 else
116 reg = RT4803_REG_VSELL;
117
118 vsel = (uV - rdev->desc->min_uV) / rdev->desc->uV_step;
119 vsel <<= ffs(RT4803_VSEL_MASK) - 1;
120
121 return regmap_update_bits(map: regmap, reg, RT4803_VSEL_MASK, val: vsel);
122}
123
124static const struct regulator_ops rt4803_regulator_ops = {
125 .list_voltage = regulator_list_voltage_linear,
126 .set_voltage_sel = regulator_set_voltage_sel_regmap,
127 .get_voltage_sel = regulator_get_voltage_sel_regmap,
128 .set_mode = rt4803_set_mode,
129 .get_mode = rt4803_get_mode,
130 .get_error_flags = rt4803_get_error_flags,
131 .set_suspend_voltage = rt4803_set_suspend_voltage,
132};
133
134static unsigned int rt4803_of_map_mode(unsigned int mode)
135{
136 switch (mode) {
137 case RT4803_AUTO_MODE:
138 return REGULATOR_MODE_NORMAL;
139 case RT4803_FPWM_MODE:
140 return REGULATOR_MODE_FAST;
141 default:
142 return REGULATOR_MODE_INVALID;
143 }
144}
145
146static const struct regmap_config rt4803_regmap_config = {
147 .reg_bits = 8,
148 .val_bits = 8,
149 .max_register = RT4803_REG_STAT,
150};
151
152static int rt4803_probe(struct i2c_client *i2c)
153{
154 struct device *dev = &i2c->dev;
155 struct regmap *regmap;
156 struct regulator_desc *desc;
157 struct regulator_config cfg = {};
158 struct regulator_dev *rdev;
159 bool vsel_act_high;
160 int ret;
161
162 desc = devm_kzalloc(dev, size: sizeof(*desc), GFP_KERNEL);
163 if (!desc)
164 return -ENOMEM;
165
166 regmap = devm_regmap_init_i2c(i2c, &rt4803_regmap_config);
167 if (IS_ERR(ptr: regmap))
168 return dev_err_probe(dev, err: PTR_ERR(ptr: regmap), fmt: "Failed to init regmap\n");
169
170 /* Always configure the input current limit to max 5A at initial */
171 ret = regmap_update_bits(map: regmap, RT4803_REG_ILIM, RT4803_ILIM_MASK, val: 0xff);
172 if (ret)
173 return dev_err_probe(dev, err: ret, fmt: "Failed to config ILIM to max\n");
174
175 vsel_act_high = device_property_read_bool(dev, propname: "richtek,vsel-active-high");
176
177 desc->name = "rt4803-regulator";
178 desc->type = REGULATOR_VOLTAGE;
179 desc->owner = THIS_MODULE;
180 desc->ops = &rt4803_regulator_ops;
181 desc->min_uV = RT4803_VOUT_MINUV;
182 desc->uV_step = RT4803_VOUT_STEPUV;
183 desc->n_voltages = RT4803_VOUT_NUM;
184 desc->vsel_mask = RT4803_VSEL_MASK;
185 desc->of_map_mode = rt4803_of_map_mode;
186 if (vsel_act_high)
187 desc->vsel_reg = RT4803_REG_VSELH;
188 else
189 desc->vsel_reg = RT4803_REG_VSELL;
190
191 cfg.dev = dev;
192 cfg.of_node = dev_of_node(dev);
193 cfg.init_data = of_get_regulator_init_data(dev, node: dev_of_node(dev), desc);
194
195 rdev = devm_regulator_register(dev, regulator_desc: desc, config: &cfg);
196 return PTR_ERR_OR_ZERO(ptr: rdev);
197}
198
199static const struct of_device_id rt4803_device_match_table[] = {
200 { .compatible = "richtek,rt4803" },
201 {}
202};
203MODULE_DEVICE_TABLE(of, rt4803_device_match_table);
204
205static struct i2c_driver rt4803_driver = {
206 .driver = {
207 .name = "rt4803",
208 .of_match_table = rt4803_device_match_table,
209 },
210 .probe = rt4803_probe,
211};
212module_i2c_driver(rt4803_driver);
213
214MODULE_DESCRIPTION("Richtek RT4803 voltage regulator driver");
215MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
216MODULE_LICENSE("GPL");
217

source code of linux/drivers/regulator/rt4803.c