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
da9211_volatile_reg(struct device * dev,unsigned int reg)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
da9211_map_buck_mode(unsigned int mode)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
da9211_buck_get_mode(struct regulator_dev * rdev)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
da9211_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)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
da9211_set_current_limit(struct regulator_dev * rdev,int min,int max)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
da9211_get_current_limit(struct regulator_dev * rdev)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
da9211_parse_regulators_dt(struct device * dev)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
da9211_parse_regulators_dt(struct device * dev)332 static struct da9211_pdata *da9211_parse_regulators_dt(
333 struct device *dev)
334 {
335 return ERR_PTR(-ENODEV);
336 }
337 #endif
338
da9211_irq_handler(int irq,void * data)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, ®_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
da9211_regulator_init(struct da9211 * chip)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 */
da9211_i2c_probe(struct i2c_client * i2c)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");
566