GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / regulator / da9211-regulator.c
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // da9211-regulator.c - Regulator device driver for DA9211/DA9212
4 // /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
5 // Copyright (C) 2015  Dialog Semiconductor Ltd.
6
7 #include <linux/err.h>
8 #include <linux/i2c.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/regulator/driver.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/regmap.h>
15 #include <linux/irq.h>
16 #include <linux/interrupt.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/regulator/of_regulator.h>
19 #include <linux/regulator/da9211.h>
20 #include <dt-bindings/regulator/dlg,da9211-regulator.h>
21 #include "da9211-regulator.h"
22
23 /* DEVICE IDs */
24 #define DA9211_DEVICE_ID        0x22
25 #define DA9213_DEVICE_ID        0x23
26 #define DA9215_DEVICE_ID        0x24
27
28 /* DA9211 REGULATOR IDs */
29 #define DA9211_ID_BUCKA 0
30 #define DA9211_ID_BUCKB 1
31
32 struct da9211 {
33         struct device *dev;
34         struct regmap *regmap;
35         struct da9211_pdata *pdata;
36         struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
37         int num_regulator;
38         int chip_irq;
39         int chip_id;
40 };
41
42 static const struct regmap_range_cfg da9211_regmap_range[] = {
43         {
44                 .selector_reg = DA9211_REG_PAGE_CON,
45                 .selector_mask  = DA9211_REG_PAGE_MASK,
46                 .selector_shift = DA9211_REG_PAGE_SHIFT,
47                 .window_start = 0,
48                 .window_len = 256,
49                 .range_min = 0,
50                 .range_max = 5*128,
51         },
52 };
53
54 static bool da9211_volatile_reg(struct device *dev, unsigned int reg)
55 {
56         switch (reg) {
57         case DA9211_REG_STATUS_A:
58         case DA9211_REG_STATUS_B:
59         case DA9211_REG_EVENT_A:
60         case DA9211_REG_EVENT_B:
61                 return true;
62         }
63         return false;
64 }
65
66 static const struct regmap_config da9211_regmap_config = {
67         .reg_bits = 8,
68         .val_bits = 8,
69         .max_register = 5 * 128,
70         .volatile_reg = da9211_volatile_reg,
71         .cache_type = REGCACHE_RBTREE,
72         .ranges = da9211_regmap_range,
73         .num_ranges = ARRAY_SIZE(da9211_regmap_range),
74 };
75
76 /* Default limits measured in millivolts and milliamps */
77 #define DA9211_MIN_MV           300
78 #define DA9211_MAX_MV           1570
79 #define DA9211_STEP_MV          10
80
81 /* Current limits for DA9211 buck (uA) indices
82  * corresponds with register values
83  */
84 static const int da9211_current_limits[] = {
85         2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
86         3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
87 };
88 /* Current limits for DA9213 buck (uA) indices
89  * corresponds with register values
90  */
91 static const int da9213_current_limits[] = {
92         3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
93         4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
94 };
95 /* Current limits for DA9215 buck (uA) indices
96  * corresponds with register values
97  */
98 static const int da9215_current_limits[] = {
99         4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
100         5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
101 };
102
103 static unsigned int da9211_map_buck_mode(unsigned int mode)
104 {
105         switch (mode) {
106         case DA9211_BUCK_MODE_SLEEP:
107                 return REGULATOR_MODE_STANDBY;
108         case DA9211_BUCK_MODE_SYNC:
109                 return REGULATOR_MODE_FAST;
110         case DA9211_BUCK_MODE_AUTO:
111                 return REGULATOR_MODE_NORMAL;
112         default:
113                 return REGULATOR_MODE_INVALID;
114         }
115 }
116
117 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
118 {
119         int id = rdev_get_id(rdev);
120         struct da9211 *chip = rdev_get_drvdata(rdev);
121         unsigned int data;
122         int ret, mode = 0;
123
124         ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
125         if (ret < 0)
126                 return ret;
127
128         switch (data & 0x03) {
129         case DA9211_BUCK_MODE_SYNC:
130                 mode = REGULATOR_MODE_FAST;
131                 break;
132         case DA9211_BUCK_MODE_AUTO:
133                 mode = REGULATOR_MODE_NORMAL;
134                 break;
135         case DA9211_BUCK_MODE_SLEEP:
136                 mode = REGULATOR_MODE_STANDBY;
137                 break;
138         }
139
140         return mode;
141 }
142
143 static int da9211_buck_set_mode(struct regulator_dev *rdev,
144                                         unsigned int mode)
145 {
146         int id = rdev_get_id(rdev);
147         struct da9211 *chip = rdev_get_drvdata(rdev);
148         int val = 0;
149
150         switch (mode) {
151         case REGULATOR_MODE_FAST:
152                 val = DA9211_BUCK_MODE_SYNC;
153                 break;
154         case REGULATOR_MODE_NORMAL:
155                 val = DA9211_BUCK_MODE_AUTO;
156                 break;
157         case REGULATOR_MODE_STANDBY:
158                 val = DA9211_BUCK_MODE_SLEEP;
159                 break;
160         }
161
162         return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
163                                         0x03, val);
164 }
165
166 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
167                                     int max)
168 {
169         int id = rdev_get_id(rdev);
170         struct da9211 *chip = rdev_get_drvdata(rdev);
171         int i, max_size;
172         const int *current_limits;
173
174         switch (chip->chip_id) {
175         case DA9211:
176                 current_limits = da9211_current_limits;
177                 max_size = ARRAY_SIZE(da9211_current_limits)-1;
178                 break;
179         case DA9213:
180                 current_limits = da9213_current_limits;
181                 max_size = ARRAY_SIZE(da9213_current_limits)-1;
182                 break;
183         case DA9215:
184                 current_limits = da9215_current_limits;
185                 max_size = ARRAY_SIZE(da9215_current_limits)-1;
186                 break;
187         default:
188                 return -EINVAL;
189         }
190
191         /* search for closest to maximum */
192         for (i = max_size; i >= 0; i--) {
193                 if (min <= current_limits[i] &&
194                     max >= current_limits[i]) {
195                                 return regmap_update_bits(chip->regmap,
196                                         DA9211_REG_BUCK_ILIM,
197                                         (0x0F << id*4), (i << id*4));
198                 }
199         }
200
201         return -EINVAL;
202 }
203
204 static int da9211_get_current_limit(struct regulator_dev *rdev)
205 {
206         int id = rdev_get_id(rdev);
207         struct da9211 *chip = rdev_get_drvdata(rdev);
208         unsigned int data;
209         int ret;
210         const int *current_limits;
211
212         switch (chip->chip_id) {
213         case DA9211:
214                 current_limits = da9211_current_limits;
215                 break;
216         case DA9213:
217                 current_limits = da9213_current_limits;
218                 break;
219         case DA9215:
220                 current_limits = da9215_current_limits;
221                 break;
222         default:
223                 return -EINVAL;
224         }
225
226         ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
227         if (ret < 0)
228                 return ret;
229
230         /* select one of 16 values: 0000 (2000mA or 3000mA)
231          * to 1111 (5000mA or 6000mA).
232          */
233         data = (data >> id*4) & 0x0F;
234         return current_limits[data];
235 }
236
237 static const struct regulator_ops da9211_buck_ops = {
238         .get_mode = da9211_buck_get_mode,
239         .set_mode = da9211_buck_set_mode,
240         .enable = regulator_enable_regmap,
241         .disable = regulator_disable_regmap,
242         .is_enabled = regulator_is_enabled_regmap,
243         .set_voltage_sel = regulator_set_voltage_sel_regmap,
244         .get_voltage_sel = regulator_get_voltage_sel_regmap,
245         .list_voltage = regulator_list_voltage_linear,
246         .set_current_limit = da9211_set_current_limit,
247         .get_current_limit = da9211_get_current_limit,
248 };
249
250 #define DA9211_BUCK(_id) \
251 {\
252         .name = #_id,\
253         .ops = &da9211_buck_ops,\
254         .type = REGULATOR_VOLTAGE,\
255         .id = DA9211_ID_##_id,\
256         .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
257         .min_uV = (DA9211_MIN_MV * 1000),\
258         .uV_step = (DA9211_STEP_MV * 1000),\
259         .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
260         .enable_mask = DA9211_BUCKA_EN,\
261         .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
262         .vsel_mask = DA9211_VBUCK_MASK,\
263         .owner = THIS_MODULE,\
264         .of_map_mode = da9211_map_buck_mode,\
265 }
266
267 static struct regulator_desc da9211_regulators[] = {
268         DA9211_BUCK(BUCKA),
269         DA9211_BUCK(BUCKB),
270 };
271
272 #ifdef CONFIG_OF
273 static struct of_regulator_match da9211_matches[] = {
274         [DA9211_ID_BUCKA] = {
275                 .name = "BUCKA",
276                 .desc = &da9211_regulators[DA9211_ID_BUCKA],
277         },
278         [DA9211_ID_BUCKB] = {
279                 .name = "BUCKB",
280                 .desc = &da9211_regulators[DA9211_ID_BUCKB],
281         },
282         };
283
284 static struct da9211_pdata *da9211_parse_regulators_dt(
285                 struct device *dev)
286 {
287         struct da9211_pdata *pdata;
288         struct device_node *node;
289         int i, num, n;
290
291         node = of_get_child_by_name(dev->of_node, "regulators");
292         if (!node) {
293                 dev_err(dev, "regulators node not found\n");
294                 return ERR_PTR(-ENODEV);
295         }
296
297         num = of_regulator_match(dev, node, da9211_matches,
298                                  ARRAY_SIZE(da9211_matches));
299         of_node_put(node);
300         if (num < 0) {
301                 dev_err(dev, "Failed to match regulators\n");
302                 return ERR_PTR(-EINVAL);
303         }
304
305         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
306         if (!pdata)
307                 return ERR_PTR(-ENOMEM);
308
309         pdata->num_buck = num;
310
311         n = 0;
312         for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
313                 if (!da9211_matches[i].init_data)
314                         continue;
315
316                 pdata->init_data[n] = da9211_matches[i].init_data;
317                 pdata->reg_node[n] = da9211_matches[i].of_node;
318                 pdata->gpiod_ren[n] = devm_fwnode_gpiod_get(dev,
319                                         of_fwnode_handle(pdata->reg_node[n]),
320                                         "enable",
321                                         GPIOD_OUT_HIGH |
322                                                 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
323                                         "da9211-enable");
324                 if (IS_ERR(pdata->gpiod_ren[n]))
325                         pdata->gpiod_ren[n] = NULL;
326                 n++;
327         }
328
329         return pdata;
330 }
331 #else
332 static struct da9211_pdata *da9211_parse_regulators_dt(
333                 struct device *dev)
334 {
335         return ERR_PTR(-ENODEV);
336 }
337 #endif
338
339 static irqreturn_t da9211_irq_handler(int irq, void *data)
340 {
341         struct da9211 *chip = data;
342         int reg_val, err, ret = IRQ_NONE;
343
344         err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
345         if (err < 0)
346                 goto error_i2c;
347
348         if (reg_val & DA9211_E_OV_CURR_A) {
349                 regulator_notifier_call_chain(chip->rdev[0],
350                         REGULATOR_EVENT_OVER_CURRENT, NULL);
351
352                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
353                         DA9211_E_OV_CURR_A);
354                 if (err < 0)
355                         goto error_i2c;
356
357                 ret = IRQ_HANDLED;
358         }
359
360         if (reg_val & DA9211_E_OV_CURR_B) {
361                 regulator_notifier_call_chain(chip->rdev[1],
362                         REGULATOR_EVENT_OVER_CURRENT, NULL);
363
364                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
365                         DA9211_E_OV_CURR_B);
366                 if (err < 0)
367                         goto error_i2c;
368
369                 ret = IRQ_HANDLED;
370         }
371
372         return ret;
373
374 error_i2c:
375         dev_err(chip->dev, "I2C error : %d\n", err);
376         return IRQ_NONE;
377 }
378
379 static int da9211_regulator_init(struct da9211 *chip)
380 {
381         struct regulator_config config = { };
382         int i, ret;
383         unsigned int data;
384
385         ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
386         if (ret < 0) {
387                 dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
388                 return ret;
389         }
390
391         data &= DA9211_SLAVE_SEL;
392         /* If configuration for 1/2 bucks is different between platform data
393          * and the register, driver should exit.
394          */
395         if (chip->pdata->num_buck == 1 && data == 0x00)
396                 chip->num_regulator = 1;
397         else if (chip->pdata->num_buck == 2 && data != 0x00)
398                 chip->num_regulator = 2;
399         else {
400                 dev_err(chip->dev, "Configuration is mismatched\n");
401                 return -EINVAL;
402         }
403
404         for (i = 0; i < chip->num_regulator; i++) {
405                 config.init_data = chip->pdata->init_data[i];
406                 config.dev = chip->dev;
407                 config.driver_data = chip;
408                 config.regmap = chip->regmap;
409                 config.of_node = chip->pdata->reg_node[i];
410
411                 if (chip->pdata->gpiod_ren[i])
412                         config.ena_gpiod = chip->pdata->gpiod_ren[i];
413                 else
414                         config.ena_gpiod = NULL;
415
416                 /*
417                  * Hand the GPIO descriptor management over to the regulator
418                  * core, remove it from GPIO devres management.
419                  */
420                 if (config.ena_gpiod)
421                         devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
422                 chip->rdev[i] = devm_regulator_register(chip->dev,
423                         &da9211_regulators[i], &config);
424                 if (IS_ERR(chip->rdev[i])) {
425                         dev_err(chip->dev,
426                                 "Failed to register DA9211 regulator\n");
427                         return PTR_ERR(chip->rdev[i]);
428                 }
429
430                 if (chip->chip_irq != 0) {
431                         ret = regmap_update_bits(chip->regmap,
432                                 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
433                         if (ret < 0) {
434                                 dev_err(chip->dev,
435                                         "Failed to update mask reg: %d\n", ret);
436                                 return ret;
437                         }
438                 }
439         }
440
441         return 0;
442 }
443
444 /*
445  * I2C driver interface functions
446  */
447 static int da9211_i2c_probe(struct i2c_client *i2c)
448 {
449         struct da9211 *chip;
450         int error, ret;
451         unsigned int data;
452
453         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
454         if (!chip)
455                 return -ENOMEM;
456
457         chip->dev = &i2c->dev;
458         chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
459         if (IS_ERR(chip->regmap)) {
460                 error = PTR_ERR(chip->regmap);
461                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
462                         error);
463                 return error;
464         }
465
466         i2c_set_clientdata(i2c, chip);
467
468         chip->pdata = i2c->dev.platform_data;
469
470         ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
471         if (ret < 0) {
472                 dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
473                 return ret;
474         }
475
476         switch (data) {
477         case DA9211_DEVICE_ID:
478                 chip->chip_id = DA9211;
479                 break;
480         case DA9213_DEVICE_ID:
481                 chip->chip_id = DA9213;
482                 break;
483         case DA9215_DEVICE_ID:
484                 chip->chip_id = DA9215;
485                 break;
486         default:
487                 dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
488                 return -ENODEV;
489         }
490
491         if (!chip->pdata)
492                 chip->pdata = da9211_parse_regulators_dt(chip->dev);
493
494         if (IS_ERR(chip->pdata)) {
495                 dev_err(chip->dev, "No regulators defined for the platform\n");
496                 return PTR_ERR(chip->pdata);
497         }
498
499         chip->chip_irq = i2c->irq;
500
501         ret = da9211_regulator_init(chip);
502         if (ret < 0) {
503                 dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
504                 return ret;
505         }
506
507         if (chip->chip_irq != 0) {
508                 ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
509                                         da9211_irq_handler,
510                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
511                                         "da9211", chip);
512                 if (ret != 0) {
513                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
514                                 chip->chip_irq);
515                         return ret;
516                 }
517         } else {
518                 dev_warn(chip->dev, "No IRQ configured\n");
519         }
520
521         return ret;
522 }
523
524 static const struct i2c_device_id da9211_i2c_id[] = {
525         {"da9211", DA9211},
526         {"da9212", DA9212},
527         {"da9213", DA9213},
528         {"da9223", DA9223},
529         {"da9214", DA9214},
530         {"da9224", DA9224},
531         {"da9215", DA9215},
532         {"da9225", DA9225},
533         {},
534 };
535 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
536
537 #ifdef CONFIG_OF
538 static const struct of_device_id da9211_dt_ids[] = {
539         { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
540         { .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
541         { .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
542         { .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
543         { .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
544         { .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
545         { .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
546         { .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
547         {},
548 };
549 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
550 #endif
551
552 static struct i2c_driver da9211_regulator_driver = {
553         .driver = {
554                 .name = "da9211",
555                 .of_match_table = of_match_ptr(da9211_dt_ids),
556         },
557         .probe_new = da9211_i2c_probe,
558         .id_table = da9211_i2c_id,
559 };
560
561 module_i2c_driver(da9211_regulator_driver);
562
563 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
564 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
565 MODULE_LICENSE("GPL");