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1// SPDX-License-Identifier: GPL-2.0
2//
3// MP8867/MP8869 regulator driver
4//
5// Copyright (C) 2020 Synaptics Incorporated
6//
7// Author: Jisheng Zhang <jszhang@kernel.org>
8
9#include <linux/gpio/consumer.h>
10#include <linux/i2c.h>
11#include <linux/module.h>
12#include <linux/of_device.h>
13#include <linux/regmap.h>
14#include <linux/regulator/driver.h>
15#include <linux/regulator/of_regulator.h>
16
17#define MP886X_VSEL 0x00
18#define MP886X_V_BOOT (1 << 7)
19#define MP886X_SYSCNTLREG1 0x01
20#define MP886X_MODE (1 << 0)
21#define MP886X_GO (1 << 6)
22#define MP886X_EN (1 << 7)
23
24struct mp886x_device_info {
25 struct device *dev;
26 struct regulator_desc desc;
27 struct regulator_init_data *regulator;
28 struct gpio_desc *en_gpio;
29 u32 r[2];
30 unsigned int sel;
31};
32
33static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
34{
35 switch (mode) {
36 case REGULATOR_MODE_FAST:
37 regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
38 MP886X_MODE, MP886X_MODE);
39 break;
40 case REGULATOR_MODE_NORMAL:
41 regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
42 MP886X_MODE, 0);
43 break;
44 default:
45 return -EINVAL;
46 }
47 return 0;
48}
49
50static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
51{
52 u32 val;
53 int ret;
54
55 ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
56 if (ret < 0)
57 return ret;
58 if (val & MP886X_MODE)
59 return REGULATOR_MODE_FAST;
60 else
61 return REGULATOR_MODE_NORMAL;
62}
63
64static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
65{
66 int ret;
67
68 ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
69 MP886X_GO, MP886X_GO);
70 if (ret < 0)
71 return ret;
72
73 sel <<= ffs(rdev->desc->vsel_mask) - 1;
74 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
75 MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
76}
77
78static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
79{
80 u32 tmp = uv * r1 / r2;
81
82 return uv + tmp;
83}
84
85static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
86{
87 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
88 int ret, uv;
89 unsigned int val;
90 bool fbloop;
91
92 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
93 if (ret)
94 return ret;
95
96 fbloop = val & MP886X_V_BOOT;
97 if (fbloop) {
98 uv = rdev->desc->min_uV;
99 uv = mp8869_scale(uv, di->r[0], di->r[1]);
100 return regulator_map_voltage_linear(rdev, uv, uv);
101 }
102
103 val &= rdev->desc->vsel_mask;
104 val >>= ffs(rdev->desc->vsel_mask) - 1;
105
106 return val;
107}
108
109static const struct regulator_ops mp8869_regulator_ops = {
110 .set_voltage_sel = mp8869_set_voltage_sel,
111 .get_voltage_sel = mp8869_get_voltage_sel,
112 .set_voltage_time_sel = regulator_set_voltage_time_sel,
113 .map_voltage = regulator_map_voltage_linear,
114 .list_voltage = regulator_list_voltage_linear,
115 .enable = regulator_enable_regmap,
116 .disable = regulator_disable_regmap,
117 .is_enabled = regulator_is_enabled_regmap,
118 .set_mode = mp886x_set_mode,
119 .get_mode = mp886x_get_mode,
120};
121
122static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
123{
124 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
125 int ret, delta;
126
127 ret = mp8869_set_voltage_sel(rdev, sel);
128 if (ret < 0)
129 return ret;
130
131 delta = di->sel - sel;
132 if (abs(delta) <= 5)
133 ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
134 MP886X_GO, 0);
135 di->sel = sel;
136
137 return ret;
138}
139
140static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
141{
142 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
143 int ret, uv;
144 unsigned int val;
145 bool fbloop;
146
147 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
148 if (ret)
149 return ret;
150
151 fbloop = val & MP886X_V_BOOT;
152
153 val &= rdev->desc->vsel_mask;
154 val >>= ffs(rdev->desc->vsel_mask) - 1;
155
156 if (fbloop) {
157 uv = regulator_list_voltage_linear(rdev, val);
158 uv = mp8869_scale(uv, di->r[0], di->r[1]);
159 return regulator_map_voltage_linear(rdev, uv, uv);
160 }
161
162 return val;
163}
164
165static const struct regulator_ops mp8867_regulator_ops = {
166 .set_voltage_sel = mp8867_set_voltage_sel,
167 .get_voltage_sel = mp8867_get_voltage_sel,
168 .set_voltage_time_sel = regulator_set_voltage_time_sel,
169 .map_voltage = regulator_map_voltage_linear,
170 .list_voltage = regulator_list_voltage_linear,
171 .enable = regulator_enable_regmap,
172 .disable = regulator_disable_regmap,
173 .is_enabled = regulator_is_enabled_regmap,
174 .set_mode = mp886x_set_mode,
175 .get_mode = mp886x_get_mode,
176};
177
178static int mp886x_regulator_register(struct mp886x_device_info *di,
179 struct regulator_config *config)
180{
181 struct regulator_desc *rdesc = &di->desc;
182 struct regulator_dev *rdev;
183
184 rdesc->name = "mp886x-reg";
185 rdesc->supply_name = "vin";
186 rdesc->ops = of_device_get_match_data(di->dev);
187 rdesc->type = REGULATOR_VOLTAGE;
188 rdesc->n_voltages = 128;
189 rdesc->enable_reg = MP886X_SYSCNTLREG1;
190 rdesc->enable_mask = MP886X_EN;
191 rdesc->min_uV = 600000;
192 rdesc->uV_step = 10000;
193 rdesc->vsel_reg = MP886X_VSEL;
194 rdesc->vsel_mask = 0x3f;
195 rdesc->owner = THIS_MODULE;
196
197 rdev = devm_regulator_register(di->dev, &di->desc, config);
198 if (IS_ERR(rdev))
199 return PTR_ERR(rdev);
200 di->sel = rdesc->ops->get_voltage_sel(rdev);
201 return 0;
202}
203
204static const struct regmap_config mp886x_regmap_config = {
205 .reg_bits = 8,
206 .val_bits = 8,
207};
208
209static int mp886x_i2c_probe(struct i2c_client *client)
210{
211 struct device *dev = &client->dev;
212 struct device_node *np = dev->of_node;
213 struct mp886x_device_info *di;
214 struct regulator_config config = { };
215 struct regmap *regmap;
216 int ret;
217
218 di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
219 if (!di)
220 return -ENOMEM;
221
222 di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
223 if (!di->regulator) {
224 dev_err(dev, "Platform data not found!\n");
225 return -EINVAL;
226 }
227
228 ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
229 di->r, 2);
230 if (ret)
231 return ret;
232
233 di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
234 if (IS_ERR(di->en_gpio))
235 return PTR_ERR(di->en_gpio);
236
237 di->dev = dev;
238
239 regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
240 if (IS_ERR(regmap)) {
241 dev_err(dev, "Failed to allocate regmap!\n");
242 return PTR_ERR(regmap);
243 }
244 i2c_set_clientdata(client, di);
245
246 config.dev = di->dev;
247 config.init_data = di->regulator;
248 config.regmap = regmap;
249 config.driver_data = di;
250 config.of_node = np;
251
252 ret = mp886x_regulator_register(di, &config);
253 if (ret < 0)
254 dev_err(dev, "Failed to register regulator!\n");
255 return ret;
256}
257
258static const struct of_device_id mp886x_dt_ids[] = {
259 {
260 .compatible = "mps,mp8867",
261 .data = &mp8867_regulator_ops
262 },
263 {
264 .compatible = "mps,mp8869",
265 .data = &mp8869_regulator_ops
266 },
267 { }
268};
269MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
270
271static const struct i2c_device_id mp886x_id[] = {
272 { "mp886x", },
273 { },
274};
275MODULE_DEVICE_TABLE(i2c, mp886x_id);
276
277static struct i2c_driver mp886x_regulator_driver = {
278 .driver = {
279 .name = "mp886x-regulator",
280 .of_match_table = of_match_ptr(mp886x_dt_ids),
281 },
282 .probe_new = mp886x_i2c_probe,
283 .id_table = mp886x_id,
284};
285module_i2c_driver(mp886x_regulator_driver);
286
287MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
288MODULE_DESCRIPTION("MP886x regulator driver");
289MODULE_LICENSE("GPL v2");