Merge branch 'drm-fixes-4.19' of git://people.freedesktop.org/~agd5f/linux into drm...
[linux-2.6-microblaze.git] / drivers / regulator / pv88090-regulator.c
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 int 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 const 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 const 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                                  (PV88090_BUCK_VRANGE_GAIN_SHIFT + i - 1)) &
402                                 PV88090_BUCK_VRANGE_GAIN_MASK;
403                         index = ((range << 1) | conf2);
404                         if (index > PV88090_ID_BUCK3) {
405                                 dev_err(chip->dev,
406                                         "Invalid index(%d)\n", index);
407                                 return -EINVAL;
408                         }
409
410                         pv88090_regulator_info[i].desc.min_uV
411                                 = pv88090_buck_vol[index].min_uV;
412                         pv88090_regulator_info[i].desc.uV_step
413                                 = pv88090_buck_vol[index].uV_step;
414                         pv88090_regulator_info[i].desc.n_voltages
415                                 = ((pv88090_buck_vol[index].max_uV)
416                                 - (pv88090_buck_vol[index].min_uV))
417                                 /(pv88090_buck_vol[index].uV_step) + 1;
418                 }
419
420                 config.driver_data = (void *)&pv88090_regulator_info[i];
421                 chip->rdev[i] = devm_regulator_register(chip->dev,
422                         &pv88090_regulator_info[i].desc, &config);
423                 if (IS_ERR(chip->rdev[i])) {
424                         dev_err(chip->dev,
425                                 "Failed to register PV88090 regulator\n");
426                         return PTR_ERR(chip->rdev[i]);
427                 }
428         }
429
430         return 0;
431 }
432
433 static const struct i2c_device_id pv88090_i2c_id[] = {
434         {"pv88090", 0},
435         {},
436 };
437 MODULE_DEVICE_TABLE(i2c, pv88090_i2c_id);
438
439 #ifdef CONFIG_OF
440 static const struct of_device_id pv88090_dt_ids[] = {
441         { .compatible = "pvs,pv88090", .data = &pv88090_i2c_id[0] },
442         {},
443 };
444 MODULE_DEVICE_TABLE(of, pv88090_dt_ids);
445 #endif
446
447 static struct i2c_driver pv88090_regulator_driver = {
448         .driver = {
449                 .name = "pv88090",
450                 .of_match_table = of_match_ptr(pv88090_dt_ids),
451         },
452         .probe = pv88090_i2c_probe,
453         .id_table = pv88090_i2c_id,
454 };
455
456 module_i2c_driver(pv88090_regulator_driver);
457
458 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
459 MODULE_DESCRIPTION("Regulator device driver for Powerventure PV88090");
460 MODULE_LICENSE("GPL");