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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
751ca3aa | 3 | // MP8867/MP8869 regulator driver |
97be8288 JZ |
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 | ||
24 | struct 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 | ||
33 | static 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 | ||
50 | static 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 | ||
64 | static 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 | ||
78 | static 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 | ||
85 | static 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 | ||
109 | static 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 | ||
751ca3aa JZ |
122 | static 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 | ||
140 | static 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 | ||
165 | static 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 | ||
97be8288 JZ |
178 | static 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 | ||
204 | static const struct regmap_config mp886x_regmap_config = { | |
205 | .reg_bits = 8, | |
206 | .val_bits = 8, | |
207 | }; | |
208 | ||
209 | static int mp886x_i2c_probe(struct i2c_client *client, | |
210 | const struct i2c_device_id *id) | |
211 | { | |
212 | struct device *dev = &client->dev; | |
213 | struct device_node *np = dev->of_node; | |
214 | struct mp886x_device_info *di; | |
215 | struct regulator_config config = { }; | |
216 | struct regmap *regmap; | |
217 | int ret; | |
218 | ||
219 | di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL); | |
220 | if (!di) | |
221 | return -ENOMEM; | |
222 | ||
223 | di->regulator = of_get_regulator_init_data(dev, np, &di->desc); | |
224 | if (!di->regulator) { | |
225 | dev_err(dev, "Platform data not found!\n"); | |
226 | return -EINVAL; | |
227 | } | |
228 | ||
229 | ret = of_property_read_u32_array(np, "mps,fb-voltage-divider", | |
230 | di->r, 2); | |
231 | if (ret) | |
232 | return ret; | |
233 | ||
234 | di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH); | |
235 | if (IS_ERR(di->en_gpio)) | |
236 | return PTR_ERR(di->en_gpio); | |
237 | ||
238 | di->dev = dev; | |
239 | ||
240 | regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config); | |
241 | if (IS_ERR(regmap)) { | |
242 | dev_err(dev, "Failed to allocate regmap!\n"); | |
243 | return PTR_ERR(regmap); | |
244 | } | |
245 | i2c_set_clientdata(client, di); | |
246 | ||
247 | config.dev = di->dev; | |
248 | config.init_data = di->regulator; | |
249 | config.regmap = regmap; | |
250 | config.driver_data = di; | |
251 | config.of_node = np; | |
252 | ||
253 | ret = mp886x_regulator_register(di, &config); | |
254 | if (ret < 0) | |
255 | dev_err(dev, "Failed to register regulator!\n"); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | static const struct of_device_id mp886x_dt_ids[] = { | |
751ca3aa JZ |
260 | { |
261 | .compatible = "mps,mp8867", | |
262 | .data = &mp8867_regulator_ops | |
263 | }, | |
97be8288 JZ |
264 | { |
265 | .compatible = "mps,mp8869", | |
266 | .data = &mp8869_regulator_ops | |
267 | }, | |
268 | { } | |
269 | }; | |
270 | MODULE_DEVICE_TABLE(of, mp886x_dt_ids); | |
271 | ||
272 | static const struct i2c_device_id mp886x_id[] = { | |
273 | { "mp886x", }, | |
274 | { }, | |
275 | }; | |
276 | MODULE_DEVICE_TABLE(i2c, mp886x_id); | |
277 | ||
278 | static struct i2c_driver mp886x_regulator_driver = { | |
279 | .driver = { | |
280 | .name = "mp886x-regulator", | |
281 | .of_match_table = of_match_ptr(mp886x_dt_ids), | |
282 | }, | |
283 | .probe = mp886x_i2c_probe, | |
284 | .id_table = mp886x_id, | |
285 | }; | |
286 | module_i2c_driver(mp886x_regulator_driver); | |
287 | ||
288 | MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>"); | |
289 | MODULE_DESCRIPTION("MP886x regulator driver"); | |
290 | MODULE_LICENSE("GPL v2"); |