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_SLEW_SHIFT 3
22 #define MP886X_SLEW_MASK (0x7 << MP886X_SLEW_SHIFT)
23 #define MP886X_GO (1 << 6)
24 #define MP886X_EN (1 << 7)
25 #define MP8869_SYSCNTLREG2 0x02
26
27 struct mp886x_cfg_info {
28 const struct regulator_ops *rops;
29 const int slew_rates[8];
30 const int switch_freq[4];
31 const u8 fs_reg;
32 const u8 fs_shift;
33 };
34
35 struct mp886x_device_info {
36 struct device *dev;
37 struct regulator_desc desc;
38 struct regulator_init_data *regulator;
39 struct gpio_desc *en_gpio;
40 const struct mp886x_cfg_info *ci;
41 u32 r[2];
42 unsigned int sel;
43 };
44
mp886x_set_ramp(struct regulator_dev * rdev,int ramp)45 static int mp886x_set_ramp(struct regulator_dev *rdev, int ramp)
46 {
47 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
48 const struct mp886x_cfg_info *ci = di->ci;
49 int reg = -1, i;
50
51 for (i = 0; i < ARRAY_SIZE(ci->slew_rates); i++) {
52 if (ramp <= ci->slew_rates[i])
53 reg = i;
54 else
55 break;
56 }
57
58 if (reg < 0) {
59 dev_err(di->dev, "unsupported ramp value %d\n", ramp);
60 return -EINVAL;
61 }
62
63 return regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
64 MP886X_SLEW_MASK, reg << MP886X_SLEW_SHIFT);
65 }
66
mp886x_set_switch_freq(struct mp886x_device_info * di,struct regmap * regmap,u32 freq)67 static void mp886x_set_switch_freq(struct mp886x_device_info *di,
68 struct regmap *regmap,
69 u32 freq)
70 {
71 const struct mp886x_cfg_info *ci = di->ci;
72 int i;
73
74 for (i = 0; i < ARRAY_SIZE(ci->switch_freq); i++) {
75 if (freq == ci->switch_freq[i]) {
76 regmap_update_bits(regmap, ci->fs_reg,
77 0x3 << ci->fs_shift, i << ci->fs_shift);
78 return;
79 }
80 }
81
82 dev_err(di->dev, "invalid frequency %d\n", freq);
83 }
84
mp886x_set_mode(struct regulator_dev * rdev,unsigned int mode)85 static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
86 {
87 switch (mode) {
88 case REGULATOR_MODE_FAST:
89 regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
90 MP886X_MODE, MP886X_MODE);
91 break;
92 case REGULATOR_MODE_NORMAL:
93 regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
94 MP886X_MODE, 0);
95 break;
96 default:
97 return -EINVAL;
98 }
99 return 0;
100 }
101
mp886x_get_mode(struct regulator_dev * rdev)102 static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
103 {
104 u32 val;
105 int ret;
106
107 ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
108 if (ret < 0)
109 return ret;
110 if (val & MP886X_MODE)
111 return REGULATOR_MODE_FAST;
112 else
113 return REGULATOR_MODE_NORMAL;
114 }
115
mp8869_set_voltage_sel(struct regulator_dev * rdev,unsigned int sel)116 static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
117 {
118 int ret;
119
120 ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
121 MP886X_GO, MP886X_GO);
122 if (ret < 0)
123 return ret;
124
125 sel <<= ffs(rdev->desc->vsel_mask) - 1;
126 return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
127 MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
128 }
129
mp8869_scale(unsigned int uv,u32 r1,u32 r2)130 static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
131 {
132 u32 tmp = uv * r1 / r2;
133
134 return uv + tmp;
135 }
136
mp8869_get_voltage_sel(struct regulator_dev * rdev)137 static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
138 {
139 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
140 int ret, uv;
141 unsigned int val;
142 bool fbloop;
143
144 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
145 if (ret)
146 return ret;
147
148 fbloop = val & MP886X_V_BOOT;
149 if (fbloop) {
150 uv = rdev->desc->min_uV;
151 uv = mp8869_scale(uv, di->r[0], di->r[1]);
152 return regulator_map_voltage_linear(rdev, uv, uv);
153 }
154
155 val &= rdev->desc->vsel_mask;
156 val >>= ffs(rdev->desc->vsel_mask) - 1;
157
158 return val;
159 }
160
161 static const struct regulator_ops mp8869_regulator_ops = {
162 .set_voltage_sel = mp8869_set_voltage_sel,
163 .get_voltage_sel = mp8869_get_voltage_sel,
164 .set_voltage_time_sel = regulator_set_voltage_time_sel,
165 .map_voltage = regulator_map_voltage_linear,
166 .list_voltage = regulator_list_voltage_linear,
167 .enable = regulator_enable_regmap,
168 .disable = regulator_disable_regmap,
169 .is_enabled = regulator_is_enabled_regmap,
170 .set_mode = mp886x_set_mode,
171 .get_mode = mp886x_get_mode,
172 .set_ramp_delay = mp886x_set_ramp,
173 };
174
175 static const struct mp886x_cfg_info mp8869_ci = {
176 .rops = &mp8869_regulator_ops,
177 .slew_rates = {
178 40000,
179 30000,
180 20000,
181 10000,
182 5000,
183 2500,
184 1250,
185 625,
186 },
187 .switch_freq = {
188 500000,
189 750000,
190 1000000,
191 1250000,
192 },
193 .fs_reg = MP8869_SYSCNTLREG2,
194 .fs_shift = 4,
195 };
196
mp8867_set_voltage_sel(struct regulator_dev * rdev,unsigned int sel)197 static int mp8867_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
198 {
199 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
200 int ret, delta;
201
202 ret = mp8869_set_voltage_sel(rdev, sel);
203 if (ret < 0)
204 return ret;
205
206 delta = di->sel - sel;
207 if (abs(delta) <= 5)
208 ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
209 MP886X_GO, 0);
210 di->sel = sel;
211
212 return ret;
213 }
214
mp8867_get_voltage_sel(struct regulator_dev * rdev)215 static int mp8867_get_voltage_sel(struct regulator_dev *rdev)
216 {
217 struct mp886x_device_info *di = rdev_get_drvdata(rdev);
218 int ret, uv;
219 unsigned int val;
220 bool fbloop;
221
222 ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
223 if (ret)
224 return ret;
225
226 fbloop = val & MP886X_V_BOOT;
227
228 val &= rdev->desc->vsel_mask;
229 val >>= ffs(rdev->desc->vsel_mask) - 1;
230
231 if (fbloop) {
232 uv = regulator_list_voltage_linear(rdev, val);
233 uv = mp8869_scale(uv, di->r[0], di->r[1]);
234 return regulator_map_voltage_linear(rdev, uv, uv);
235 }
236
237 return val;
238 }
239
240 static const struct regulator_ops mp8867_regulator_ops = {
241 .set_voltage_sel = mp8867_set_voltage_sel,
242 .get_voltage_sel = mp8867_get_voltage_sel,
243 .set_voltage_time_sel = regulator_set_voltage_time_sel,
244 .map_voltage = regulator_map_voltage_linear,
245 .list_voltage = regulator_list_voltage_linear,
246 .enable = regulator_enable_regmap,
247 .disable = regulator_disable_regmap,
248 .is_enabled = regulator_is_enabled_regmap,
249 .set_mode = mp886x_set_mode,
250 .get_mode = mp886x_get_mode,
251 .set_ramp_delay = mp886x_set_ramp,
252 };
253
254 static const struct mp886x_cfg_info mp8867_ci = {
255 .rops = &mp8867_regulator_ops,
256 .slew_rates = {
257 64000,
258 32000,
259 16000,
260 8000,
261 4000,
262 2000,
263 1000,
264 500,
265 },
266 .switch_freq = {
267 500000,
268 750000,
269 1000000,
270 1500000,
271 },
272 .fs_reg = MP886X_SYSCNTLREG1,
273 .fs_shift = 1,
274 };
275
mp886x_regulator_register(struct mp886x_device_info * di,struct regulator_config * config)276 static int mp886x_regulator_register(struct mp886x_device_info *di,
277 struct regulator_config *config)
278 {
279 struct regulator_desc *rdesc = &di->desc;
280 struct regulator_dev *rdev;
281
282 rdesc->name = "mp886x-reg";
283 rdesc->supply_name = "vin";
284 rdesc->ops = di->ci->rops;
285 rdesc->type = REGULATOR_VOLTAGE;
286 rdesc->n_voltages = 128;
287 rdesc->enable_reg = MP886X_SYSCNTLREG1;
288 rdesc->enable_mask = MP886X_EN;
289 rdesc->min_uV = 600000;
290 rdesc->uV_step = 10000;
291 rdesc->vsel_reg = MP886X_VSEL;
292 rdesc->vsel_mask = 0x3f;
293 rdesc->owner = THIS_MODULE;
294
295 rdev = devm_regulator_register(di->dev, &di->desc, config);
296 if (IS_ERR(rdev))
297 return PTR_ERR(rdev);
298 di->sel = rdesc->ops->get_voltage_sel(rdev);
299 return 0;
300 }
301
302 static const struct regmap_config mp886x_regmap_config = {
303 .reg_bits = 8,
304 .val_bits = 8,
305 };
306
mp886x_i2c_probe(struct i2c_client * client)307 static int mp886x_i2c_probe(struct i2c_client *client)
308 {
309 struct device *dev = &client->dev;
310 struct device_node *np = dev->of_node;
311 struct mp886x_device_info *di;
312 struct regulator_config config = { };
313 struct regmap *regmap;
314 u32 freq;
315 int ret;
316
317 di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
318 if (!di)
319 return -ENOMEM;
320
321 di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
322 if (!di->regulator) {
323 dev_err(dev, "Platform data not found!\n");
324 return -EINVAL;
325 }
326
327 ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
328 di->r, 2);
329 if (ret)
330 return ret;
331
332 di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
333 if (IS_ERR(di->en_gpio))
334 return PTR_ERR(di->en_gpio);
335
336 di->ci = of_device_get_match_data(dev);
337 di->dev = dev;
338
339 regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
340 if (IS_ERR(regmap)) {
341 dev_err(dev, "Failed to allocate regmap!\n");
342 return PTR_ERR(regmap);
343 }
344 i2c_set_clientdata(client, di);
345
346 config.dev = di->dev;
347 config.init_data = di->regulator;
348 config.regmap = regmap;
349 config.driver_data = di;
350 config.of_node = np;
351
352 if (!of_property_read_u32(np, "mps,switch-frequency-hz", &freq))
353 mp886x_set_switch_freq(di, regmap, freq);
354
355 ret = mp886x_regulator_register(di, &config);
356 if (ret < 0)
357 dev_err(dev, "Failed to register regulator!\n");
358 return ret;
359 }
360
361 static const struct of_device_id mp886x_dt_ids[] = {
362 {
363 .compatible = "mps,mp8867",
364 .data = &mp8867_ci
365 },
366 {
367 .compatible = "mps,mp8869",
368 .data = &mp8869_ci
369 },
370 { }
371 };
372 MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
373
374 static const struct i2c_device_id mp886x_id[] = {
375 { "mp886x", },
376 { },
377 };
378 MODULE_DEVICE_TABLE(i2c, mp886x_id);
379
380 static struct i2c_driver mp886x_regulator_driver = {
381 .driver = {
382 .name = "mp886x-regulator",
383 .of_match_table = of_match_ptr(mp886x_dt_ids),
384 },
385 .probe_new = mp886x_i2c_probe,
386 .id_table = mp886x_id,
387 };
388 module_i2c_driver(mp886x_regulator_driver);
389
390 MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
391 MODULE_DESCRIPTION("MP886x regulator driver");
392 MODULE_LICENSE("GPL v2");
393