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Linux 4.9.137
[linux/fpc-iii.git] / drivers / regulator / pv88090-regulator.c
blob42164117535298bc011378bad23f221e8063c566
1 /*
2 * pv88090-regulator.c - Regulator device driver for PV88090
3 * Copyright (C) 2015 Powerventure Semiconductor Ltd.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 */
15
16 #include <linux/err.h>
17 #include <linux/i2c.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/machine.h>
23 #include <linux/regmap.h>
24 #include <linux/irq.h>
25 #include <linux/interrupt.h>
26 #include <linux/regulator/of_regulator.h>
27 #include "pv88090-regulator.h"
28
29 #define PV88090_MAX_REGULATORS 5
30
31 /* PV88090 REGULATOR IDs */
32 enum {
33 /* BUCKs */
34 PV88090_ID_BUCK1,
35 PV88090_ID_BUCK2,
36 PV88090_ID_BUCK3,
37
38 /* LDOs */
39 PV88090_ID_LDO1,
40 PV88090_ID_LDO2,
41 };
42
43 struct pv88090_regulator {
44 struct regulator_desc desc;
45 /* Current limiting */
46 unsigned n_current_limits;
47 const int *current_limits;
48 unsigned int limit_mask;
49 unsigned int conf;
50 unsigned int conf2;
51 };
52
53 struct pv88090 {
54 struct device *dev;
55 struct regmap *regmap;
56 struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
57 };
58
59 struct pv88090_buck_voltage {
60 int min_uV;
61 int max_uV;
62 int uV_step;
63 };
64
65 static const struct regmap_config pv88090_regmap_config = {
66 .reg_bits = 8,
67 .val_bits = 8,
68 };
69
70 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
71 * Entry indexes corresponds to register values.
72 */
73
74 static const int pv88090_buck1_limits[] = {
75 220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000,
76 1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
77 3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
78 5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
79 };
80
81 static const int pv88090_buck23_limits[] = {
82 1496000, 2393000, 3291000, 4189000
83 };
84
85 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
86 {
87 .min_uV = 600000,
88 .max_uV = 1393750,
89 .uV_step = 6250,
90 },
91
92 {
93 .min_uV = 1400000,
94 .max_uV = 2193750,
95 .uV_step = 6250,
96 },
97 {
98 .min_uV = 1250000,
99 .max_uV = 2837500,
100 .uV_step = 12500,
101 },
102 };
103
104 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
105 {
106 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
107 unsigned int data;
108 int ret, mode = 0;
109
110 ret = regmap_read(rdev->regmap, info->conf, &data);
111 if (ret < 0)
112 return ret;
113
114 switch (data & PV88090_BUCK1_MODE_MASK) {
115 case PV88090_BUCK_MODE_SYNC:
116 mode = REGULATOR_MODE_FAST;
117 break;
118 case PV88090_BUCK_MODE_AUTO:
119 mode = REGULATOR_MODE_NORMAL;
120 break;
121 case PV88090_BUCK_MODE_SLEEP:
122 mode = REGULATOR_MODE_STANDBY;
123 break;
124 }
125
126 return mode;
127 }
128
129 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
130 unsigned int mode)
131 {
132 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
133 int val = 0;
134
135 switch (mode) {
136 case REGULATOR_MODE_FAST:
137 val = PV88090_BUCK_MODE_SYNC;
138 break;
139 case REGULATOR_MODE_NORMAL:
140 val = PV88090_BUCK_MODE_AUTO;
141 break;
142 case REGULATOR_MODE_STANDBY:
143 val = PV88090_BUCK_MODE_SLEEP;
144 break;
145 default:
146 return -EINVAL;
147 }
148
149 return regmap_update_bits(rdev->regmap, info->conf,
150 PV88090_BUCK1_MODE_MASK, val);
151 }
152
153 static int pv88090_set_current_limit(struct regulator_dev *rdev, int min,
154 int max)
155 {
156 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
157 int i;
158
159 /* search for closest to maximum */
160 for (i = info->n_current_limits; i >= 0; i--) {
161 if (min <= info->current_limits[i]
162 && max >= info->current_limits[i]) {
163 return regmap_update_bits(rdev->regmap,
164 info->conf,
165 info->limit_mask,
166 i << PV88090_BUCK1_ILIM_SHIFT);
167 }
168 }
169
170 return -EINVAL;
171 }
172
173 static int pv88090_get_current_limit(struct regulator_dev *rdev)
174 {
175 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
176 unsigned int data;
177 int ret;
178
179 ret = regmap_read(rdev->regmap, info->conf, &data);
180 if (ret < 0)
181 return ret;
182
183 data = (data & info->limit_mask) >> PV88090_BUCK1_ILIM_SHIFT;
184 return info->current_limits[data];
185 }
186
187 static struct regulator_ops pv88090_buck_ops = {
188 .get_mode = pv88090_buck_get_mode,
189 .set_mode = pv88090_buck_set_mode,
190 .enable = regulator_enable_regmap,
191 .disable = regulator_disable_regmap,
192 .is_enabled = regulator_is_enabled_regmap,
193 .set_voltage_sel = regulator_set_voltage_sel_regmap,
194 .get_voltage_sel = regulator_get_voltage_sel_regmap,
195 .list_voltage = regulator_list_voltage_linear,
196 .set_current_limit = pv88090_set_current_limit,
197 .get_current_limit = pv88090_get_current_limit,
198 };
199
200 static struct regulator_ops pv88090_ldo_ops = {
201 .enable = regulator_enable_regmap,
202 .disable = regulator_disable_regmap,
203 .is_enabled = regulator_is_enabled_regmap,
204 .set_voltage_sel = regulator_set_voltage_sel_regmap,
205 .get_voltage_sel = regulator_get_voltage_sel_regmap,
206 .list_voltage = regulator_list_voltage_linear,
207 };
208
209 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
210 {\
211 .desc = {\
212 .id = chip##_ID_##regl_name,\
213 .name = __stringify(chip##_##regl_name),\
214 .of_match = of_match_ptr(#regl_name),\
215 .regulators_node = of_match_ptr("regulators"),\
216 .type = REGULATOR_VOLTAGE,\
217 .owner = THIS_MODULE,\
218 .ops = &pv88090_buck_ops,\
219 .min_uV = min, \
220 .uV_step = step, \
221 .n_voltages = ((max) - (min))/(step) + 1, \
222 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
223 .enable_mask = PV88090_##regl_name##_EN, \
224 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
225 .vsel_mask = PV88090_V##regl_name##_MASK, \
226 },\
227 .current_limits = limits_array, \
228 .n_current_limits = ARRAY_SIZE(limits_array), \
229 .limit_mask = PV88090_##regl_name##_ILIM_MASK, \
230 .conf = PV88090_REG_##regl_name##_CONF1, \
231 .conf2 = PV88090_REG_##regl_name##_CONF2, \
232 }
233
234 #define PV88090_LDO(chip, regl_name, min, step, max) \
235 {\
236 .desc = {\
237 .id = chip##_ID_##regl_name,\
238 .name = __stringify(chip##_##regl_name),\
239 .of_match = of_match_ptr(#regl_name),\
240 .regulators_node = of_match_ptr("regulators"),\
241 .type = REGULATOR_VOLTAGE,\
242 .owner = THIS_MODULE,\
243 .ops = &pv88090_ldo_ops,\
244 .min_uV = min, \
245 .uV_step = step, \
246 .n_voltages = ((max) - (min))/(step) + 1, \
247 .enable_reg = PV88090_REG_##regl_name##_CONT, \
248 .enable_mask = PV88090_##regl_name##_EN, \
249 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
250 .vsel_mask = PV88090_V##regl_name##_MASK, \
251 },\
252 }
253
254 static struct pv88090_regulator pv88090_regulator_info[] = {
255 PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
256 pv88090_buck1_limits),
257 PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
258 pv88090_buck23_limits),
259 PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
260 pv88090_buck23_limits),
261 PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
262 PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000),
263 };
264
265 static irqreturn_t pv88090_irq_handler(int irq, void *data)
266 {
267 struct pv88090 *chip = data;
268 int i, reg_val, err, ret = IRQ_NONE;
269
270 err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
271 if (err < 0)
272 goto error_i2c;
273
274 if (reg_val & PV88090_E_VDD_FLT) {
275 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
276 if (chip->rdev[i] != NULL) {
277 regulator_notifier_call_chain(chip->rdev[i],
278 REGULATOR_EVENT_UNDER_VOLTAGE,
279 NULL);
280 }
281 }
282
283 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
284 PV88090_E_VDD_FLT);
285 if (err < 0)
286 goto error_i2c;
287
288 ret = IRQ_HANDLED;
289 }
290
291 if (reg_val & PV88090_E_OVER_TEMP) {
292 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
293 if (chip->rdev[i] != NULL) {
294 regulator_notifier_call_chain(chip->rdev[i],
295 REGULATOR_EVENT_OVER_TEMP,
296 NULL);
297 }
298 }
299
300 err = regmap_write(chip->regmap, PV88090_REG_EVENT_A,
301 PV88090_E_OVER_TEMP);
302 if (err < 0)
303 goto error_i2c;
304
305 ret = IRQ_HANDLED;
306 }
307
308 return ret;
309
310 error_i2c:
311 dev_err(chip->dev, "I2C error : %d\n", err);
312 return IRQ_NONE;
313 }
314
315 /*
316 * I2C driver interface functions
317 */
318 static int pv88090_i2c_probe(struct i2c_client *i2c,
319 const struct i2c_device_id *id)
320 {
321 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
322 struct pv88090 *chip;
323 struct regulator_config config = { };
324 int error, i, ret = 0;
325 unsigned int conf2, range, index;
326
327 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
328 if (!chip)
329 return -ENOMEM;
330
331 chip->dev = &i2c->dev;
332 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
333 if (IS_ERR(chip->regmap)) {
334 error = PTR_ERR(chip->regmap);
335 dev_err(chip->dev, "Failed to allocate register map: %d\n",
336 error);
337 return error;
338 }
339
340 i2c_set_clientdata(i2c, chip);
341
342 if (i2c->irq != 0) {
343 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
344 if (ret < 0) {
345 dev_err(chip->dev,
346 "Failed to mask A reg: %d\n", ret);
347 return ret;
348 }
349
350 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
351 if (ret < 0) {
352 dev_err(chip->dev,
353 "Failed to mask B reg: %d\n", ret);
354 return ret;
355 }
356
357 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
358 pv88090_irq_handler,
359 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
360 "pv88090", chip);
361 if (ret != 0) {
362 dev_err(chip->dev, "Failed to request IRQ: %d\n",
363 i2c->irq);
364 return ret;
365 }
366
367 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
368 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
369 if (ret < 0) {
370 dev_err(chip->dev,
371 "Failed to update mask reg: %d\n", ret);
372 return ret;
373 }
374
375 } else {
376 dev_warn(chip->dev, "No IRQ configured\n");
377 }
378
379 config.dev = chip->dev;
380 config.regmap = chip->regmap;
381
382 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
383 if (init_data)
384 config.init_data = &init_data[i];
385
386 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
387 ret = regmap_read(chip->regmap,
388 pv88090_regulator_info[i].conf2, &conf2);
389 if (ret < 0)
390 return ret;
391
392 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
393 PV88090_BUCK_VDAC_RANGE_MASK;
394
395 ret = regmap_read(chip->regmap,
396 PV88090_REG_BUCK_FOLD_RANGE, &range);
397 if (ret < 0)
398 return ret;
399
400 range = (range >>
401 (PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
402 PV88080_BUCK_VRANGE_GAIN_MASK;
403 index = ((range << 1) | conf2);
404
405 pv88090_regulator_info[i].desc.min_uV
406 = pv88090_buck_vol[index].min_uV;
407 pv88090_regulator_info[i].desc.uV_step
408 = pv88090_buck_vol[index].uV_step;
409 pv88090_regulator_info[i].desc.n_voltages
410 = ((pv88090_buck_vol[index].max_uV)
411 - (pv88090_buck_vol[index].min_uV))
412 /(pv88090_buck_vol[index].uV_step) + 1;
413 }
414
415 config.driver_data = (void *)&pv88090_regulator_info[i];
416 chip->rdev[i] = devm_regulator_register(chip->dev,
417 &pv88090_regulator_info[i].desc, &config);
418 if (IS_ERR(chip->rdev[i])) {
419 dev_err(chip->dev,
420 "Failed to register PV88090 regulator\n");
421 return PTR_ERR(chip->rdev[i]);
422 }
423 }
424
425 return 0;
426 }
427
428 static const struct i2c_device_id pv88090_i2c_id[] = {
429 {"pv88090", 0},
430 {},
431 };
432 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
433
434 #ifdef CONFIG_OF
435 static const struct of_device_id pv88090_dt_ids[] = {
436 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
437 {},
438 };
439 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
440 #endif
441
442 static struct i2c_driver pv88090_regulator_driver = {
443 .driver = {
444 .name = "pv88090",
445 .of_match_table = of_match_ptr(pv88090_dt_ids),
446 },
447 .probe = pv88090_i2c_probe,
448 .id_table = pv88090_i2c_id,
449 };
450
451 module_i2c_driver(pv88090_regulator_driver);
452
453 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
454 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
455 MODULE_LICENSE("GPL");
Linux with added FPC-III support