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Merge branch 'rocker-worlds'
[linux/fpc-iii.git] / drivers / regulator / pv88090-regulator.c
blobac15f31b5fe0cc83061ef002b32b9c7aaae5dc06
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/gpio.h>
18 #include <linux/i2c.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/slab.h>
22 #include <linux/regulator/driver.h>
23 #include <linux/regulator/machine.h>
24 #include <linux/regmap.h>
25 #include <linux/irq.h>
26 #include <linux/interrupt.h>
27 #include <linux/regulator/of_regulator.h>
28 #include <linux/proc_fs.h>
29 #include <linux/uaccess.h>
30 #include "pv88090-regulator.h"
31
32 #define PV88090_MAX_REGULATORS 5
33
34 /* PV88090 REGULATOR IDs */
35 enum {
36 /* BUCKs */
37 PV88090_ID_BUCK1,
38 PV88090_ID_BUCK2,
39 PV88090_ID_BUCK3,
40
41 /* LDOs */
42 PV88090_ID_LDO1,
43 PV88090_ID_LDO2,
44 };
45
46 struct pv88090_regulator {
47 struct regulator_desc desc;
48 /* Current limiting */
49 unsigned n_current_limits;
50 const int *current_limits;
51 unsigned int limit_mask;
52 unsigned int conf;
53 unsigned int conf2;
54 };
55
56 struct pv88090 {
57 struct device *dev;
58 struct regmap *regmap;
59 struct regulator_dev *rdev[PV88090_MAX_REGULATORS];
60 };
61
62 struct pv88090_buck_voltage {
63 int min_uV;
64 int max_uV;
65 int uV_step;
66 };
67
68 static const struct regmap_config pv88090_regmap_config = {
69 .reg_bits = 8,
70 .val_bits = 8,
71 };
72
73 /* Current limits array (in uA) for BUCK1, BUCK2, BUCK3.
74 * Entry indexes corresponds to register values.
75 */
76
77 static const int pv88090_buck1_limits[] = {
78 220000, 440000, 660000, 880000, 1100000, 1320000, 1540000, 1760000,
79 1980000, 2200000, 2420000, 2640000, 2860000, 3080000, 3300000, 3520000,
80 3740000, 3960000, 4180000, 4400000, 4620000, 4840000, 5060000, 5280000,
81 5500000, 5720000, 5940000, 6160000, 6380000, 6600000, 6820000, 7040000
82 };
83
84 static const int pv88090_buck23_limits[] = {
85 1496000, 2393000, 3291000, 4189000
86 };
87
88 static const struct pv88090_buck_voltage pv88090_buck_vol[3] = {
89 {
90 .min_uV = 600000,
91 .max_uV = 1393750,
92 .uV_step = 6250,
93 },
94
95 {
96 .min_uV = 1400000,
97 .max_uV = 2193750,
98 .uV_step = 6250,
99 },
100 {
101 .min_uV = 1250000,
102 .max_uV = 2837500,
103 .uV_step = 12500,
104 },
105 };
106
107 static unsigned int pv88090_buck_get_mode(struct regulator_dev *rdev)
108 {
109 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
110 unsigned int data;
111 int ret, mode = 0;
112
113 ret = regmap_read(rdev->regmap, info->conf, &data);
114 if (ret < 0)
115 return ret;
116
117 switch (data & PV88090_BUCK1_MODE_MASK) {
118 case PV88090_BUCK_MODE_SYNC:
119 mode = REGULATOR_MODE_FAST;
120 break;
121 case PV88090_BUCK_MODE_AUTO:
122 mode = REGULATOR_MODE_NORMAL;
123 break;
124 case PV88090_BUCK_MODE_SLEEP:
125 mode = REGULATOR_MODE_STANDBY;
126 break;
127 }
128
129 return mode;
130 }
131
132 static int pv88090_buck_set_mode(struct regulator_dev *rdev,
133 unsigned int mode)
134 {
135 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
136 int val = 0;
137
138 switch (mode) {
139 case REGULATOR_MODE_FAST:
140 val = PV88090_BUCK_MODE_SYNC;
141 break;
142 case REGULATOR_MODE_NORMAL:
143 val = PV88090_BUCK_MODE_AUTO;
144 break;
145 case REGULATOR_MODE_STANDBY:
146 val = PV88090_BUCK_MODE_SLEEP;
147 break;
148 default:
149 return -EINVAL;
150 }
151
152 return regmap_update_bits(rdev->regmap, info->conf,
153 PV88090_BUCK1_MODE_MASK, val);
154 }
155
156 static int pv88090_set_current_limit(struct regulator_dev *rdev, int min,
157 int max)
158 {
159 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
160 int i;
161
162 /* search for closest to maximum */
163 for (i = info->n_current_limits; i >= 0; i--) {
164 if (min <= info->current_limits[i]
165 && max >= info->current_limits[i]) {
166 return regmap_update_bits(rdev->regmap,
167 info->conf,
168 info->limit_mask,
169 i << PV88090_BUCK1_ILIM_SHIFT);
170 }
171 }
172
173 return -EINVAL;
174 }
175
176 static int pv88090_get_current_limit(struct regulator_dev *rdev)
177 {
178 struct pv88090_regulator *info = rdev_get_drvdata(rdev);
179 unsigned int data;
180 int ret;
181
182 ret = regmap_read(rdev->regmap, info->conf, &data);
183 if (ret < 0)
184 return ret;
185
186 data = (data & info->limit_mask) >> PV88090_BUCK1_ILIM_SHIFT;
187 return info->current_limits[data];
188 }
189
190 static struct regulator_ops pv88090_buck_ops = {
191 .get_mode = pv88090_buck_get_mode,
192 .set_mode = pv88090_buck_set_mode,
193 .enable = regulator_enable_regmap,
194 .disable = regulator_disable_regmap,
195 .is_enabled = regulator_is_enabled_regmap,
196 .set_voltage_sel = regulator_set_voltage_sel_regmap,
197 .get_voltage_sel = regulator_get_voltage_sel_regmap,
198 .list_voltage = regulator_list_voltage_linear,
199 .set_current_limit = pv88090_set_current_limit,
200 .get_current_limit = pv88090_get_current_limit,
201 };
202
203 static struct regulator_ops pv88090_ldo_ops = {
204 .enable = regulator_enable_regmap,
205 .disable = regulator_disable_regmap,
206 .is_enabled = regulator_is_enabled_regmap,
207 .set_voltage_sel = regulator_set_voltage_sel_regmap,
208 .get_voltage_sel = regulator_get_voltage_sel_regmap,
209 .list_voltage = regulator_list_voltage_linear,
210 };
211
212 #define PV88090_BUCK(chip, regl_name, min, step, max, limits_array) \
213 {\
214 .desc = {\
215 .id = chip##_ID_##regl_name,\
216 .name = __stringify(chip##_##regl_name),\
217 .of_match = of_match_ptr(#regl_name),\
218 .regulators_node = of_match_ptr("regulators"),\
219 .type = REGULATOR_VOLTAGE,\
220 .owner = THIS_MODULE,\
221 .ops = &pv88090_buck_ops,\
222 .min_uV = min, \
223 .uV_step = step, \
224 .n_voltages = ((max) - (min))/(step) + 1, \
225 .enable_reg = PV88090_REG_##regl_name##_CONF0, \
226 .enable_mask = PV88090_##regl_name##_EN, \
227 .vsel_reg = PV88090_REG_##regl_name##_CONF0, \
228 .vsel_mask = PV88090_V##regl_name##_MASK, \
229 },\
230 .current_limits = limits_array, \
231 .n_current_limits = ARRAY_SIZE(limits_array), \
232 .limit_mask = PV88090_##regl_name##_ILIM_MASK, \
233 .conf = PV88090_REG_##regl_name##_CONF1, \
234 .conf2 = PV88090_REG_##regl_name##_CONF2, \
235 }
236
237 #define PV88090_LDO(chip, regl_name, min, step, max) \
238 {\
239 .desc = {\
240 .id = chip##_ID_##regl_name,\
241 .name = __stringify(chip##_##regl_name),\
242 .of_match = of_match_ptr(#regl_name),\
243 .regulators_node = of_match_ptr("regulators"),\
244 .type = REGULATOR_VOLTAGE,\
245 .owner = THIS_MODULE,\
246 .ops = &pv88090_ldo_ops,\
247 .min_uV = min, \
248 .uV_step = step, \
249 .n_voltages = ((max) - (min))/(step) + 1, \
250 .enable_reg = PV88090_REG_##regl_name##_CONT, \
251 .enable_mask = PV88090_##regl_name##_EN, \
252 .vsel_reg = PV88090_REG_##regl_name##_CONT, \
253 .vsel_mask = PV88090_V##regl_name##_MASK, \
254 },\
255 }
256
257 static struct pv88090_regulator pv88090_regulator_info[] = {
258 PV88090_BUCK(PV88090, BUCK1, 600000, 6250, 1393750,
259 pv88090_buck1_limits),
260 PV88090_BUCK(PV88090, BUCK2, 600000, 6250, 1393750,
261 pv88090_buck23_limits),
262 PV88090_BUCK(PV88090, BUCK3, 600000, 6250, 1393750,
263 pv88090_buck23_limits),
264 PV88090_LDO(PV88090, LDO1, 1200000, 50000, 4350000),
265 PV88090_LDO(PV88090, LDO2, 650000, 25000, 2225000),
266 };
267
268 static irqreturn_t pv88090_irq_handler(int irq, void *data)
269 {
270 struct pv88090 *chip = data;
271 int i, reg_val, err, ret = IRQ_NONE;
272
273 err = regmap_read(chip->regmap, PV88090_REG_EVENT_A, &reg_val);
274 if (err < 0)
275 goto error_i2c;
276
277 if (reg_val & PV88090_E_VDD_FLT) {
278 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
279 if (chip->rdev[i] != NULL) {
280 regulator_notifier_call_chain(chip->rdev[i],
281 REGULATOR_EVENT_UNDER_VOLTAGE,
282 NULL);
283 }
284 }
285
286 err = regmap_update_bits(chip->regmap, PV88090_REG_EVENT_A,
287 PV88090_E_VDD_FLT, PV88090_E_VDD_FLT);
288 if (err < 0)
289 goto error_i2c;
290
291 ret = IRQ_HANDLED;
292 }
293
294 if (reg_val & PV88090_E_OVER_TEMP) {
295 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
296 if (chip->rdev[i] != NULL) {
297 regulator_notifier_call_chain(chip->rdev[i],
298 REGULATOR_EVENT_OVER_TEMP,
299 NULL);
300 }
301 }
302
303 err = regmap_update_bits(chip->regmap, PV88090_REG_EVENT_A,
304 PV88090_E_OVER_TEMP, PV88090_E_OVER_TEMP);
305 if (err < 0)
306 goto error_i2c;
307
308 ret = IRQ_HANDLED;
309 }
310
311 return ret;
312
313 error_i2c:
314 dev_err(chip->dev, "I2C error : %d\n", err);
315 return IRQ_NONE;
316 }
317
318 /*
319 * I2C driver interface functions
320 */
321 static int pv88090_i2c_probe(struct i2c_client *i2c,
322 const struct i2c_device_id *id)
323 {
324 struct regulator_init_data *init_data = dev_get_platdata(&i2c->dev);
325 struct pv88090 *chip;
326 struct regulator_config config = { };
327 int error, i, ret = 0;
328 unsigned int conf2, range, index;
329
330 chip = devm_kzalloc(&i2c->dev, sizeof(struct pv88090), GFP_KERNEL);
331 if (!chip)
332 return -ENOMEM;
333
334 chip->dev = &i2c->dev;
335 chip->regmap = devm_regmap_init_i2c(i2c, &pv88090_regmap_config);
336 if (IS_ERR(chip->regmap)) {
337 error = PTR_ERR(chip->regmap);
338 dev_err(chip->dev, "Failed to allocate register map: %d\n",
339 error);
340 return error;
341 }
342
343 i2c_set_clientdata(i2c, chip);
344
345 if (i2c->irq != 0) {
346 ret = regmap_write(chip->regmap, PV88090_REG_MASK_A, 0xFF);
347 if (ret < 0) {
348 dev_err(chip->dev,
349 "Failed to mask A reg: %d\n", ret);
350 return ret;
351 }
352
353 ret = regmap_write(chip->regmap, PV88090_REG_MASK_B, 0xFF);
354 if (ret < 0) {
355 dev_err(chip->dev,
356 "Failed to mask B reg: %d\n", ret);
357 return ret;
358 }
359
360 ret = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
361 pv88090_irq_handler,
362 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
363 "pv88090", chip);
364 if (ret != 0) {
365 dev_err(chip->dev, "Failed to request IRQ: %d\n",
366 i2c->irq);
367 return ret;
368 }
369
370 ret = regmap_update_bits(chip->regmap, PV88090_REG_MASK_A,
371 PV88090_M_VDD_FLT | PV88090_M_OVER_TEMP, 0);
372 if (ret < 0) {
373 dev_err(chip->dev,
374 "Failed to update mask reg: %d\n", ret);
375 return ret;
376 }
377
378 } else {
379 dev_warn(chip->dev, "No IRQ configured\n");
380 }
381
382 config.dev = chip->dev;
383 config.regmap = chip->regmap;
384
385 for (i = 0; i < PV88090_MAX_REGULATORS; i++) {
386 if (init_data)
387 config.init_data = &init_data[i];
388
389 if (i == PV88090_ID_BUCK2 || i == PV88090_ID_BUCK3) {
390 ret = regmap_read(chip->regmap,
391 pv88090_regulator_info[i].conf2, &conf2);
392 if (ret < 0)
393 return ret;
394
395 conf2 = (conf2 >> PV88090_BUCK_VDAC_RANGE_SHIFT) &
396 PV88090_BUCK_VDAC_RANGE_MASK;
397
398 ret = regmap_read(chip->regmap,
399 PV88090_REG_BUCK_FOLD_RANGE, &range);
400 if (ret < 0)
401 return ret;
402
403 range = (range >>
404 (PV88080_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
405 PV88080_BUCK_VRANGE_GAIN_MASK;
406 index = ((range << 1) | conf2);
407
408 pv88090_regulator_info[i].desc.min_uV
409 = pv88090_buck_vol[index].min_uV;
410 pv88090_regulator_info[i].desc.uV_step
411 = pv88090_buck_vol[index].uV_step;
412 pv88090_regulator_info[i].desc.n_voltages
413 = ((pv88090_buck_vol[index].max_uV)
414 - (pv88090_buck_vol[index].min_uV))
415 /(pv88090_buck_vol[index].uV_step) + 1;
416 }
417
418 config.driver_data = (void *)&pv88090_regulator_info[i];
419 chip->rdev[i] = devm_regulator_register(chip->dev,
420 &pv88090_regulator_info[i].desc, &config);
421 if (IS_ERR(chip->rdev[i])) {
422 dev_err(chip->dev,
423 "Failed to register PV88090 regulator\n");
424 return PTR_ERR(chip->rdev[i]);
425 }
426 }
427
428 return 0;
429 }
430
431 static const struct i2c_device_id pv88090_i2c_id[] = {
432 {"pv88090", 0},
433 {},
434 };
435 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
436
437 #ifdef CONFIG_OF
438 static const struct of_device_id pv88090_dt_ids[] = {
439 { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
440 {},
441 };
442 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
443 #endif
444
445 static struct i2c_driver pv88090_regulator_driver = {
446 .driver = {
447 .name = "pv88090",
448 .of_match_table = of_match_ptr(pv88090_dt_ids),
449 },
450 .probe = pv88090_i2c_probe,
451 .id_table = pv88090_i2c_id,
452 };
453
454 module_i2c_driver(pv88090_regulator_driver);
455
456 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
457 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
458 MODULE_LICENSE("GPL");
Linux with added FPC-III support