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