1 /*
2 * da9211-regulator.c - Regulator device driver for DA9211/DA9213/DA9215
3 * Copyright (C) 2015 Dialog Semiconductor Ltd.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library 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 GNU
13 * Library 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/of_gpio.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
45 struct 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
55 static 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
67 static 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 */
83 static 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 */
90 static 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 */
97 static 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
da9211_buck_get_mode(struct regulator_dev * rdev)102 static 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
da9211_buck_set_mode(struct regulator_dev * rdev,unsigned int mode)128 static 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
da9211_set_current_limit(struct regulator_dev * rdev,int min,int max)151 static 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
da9211_get_current_limit(struct regulator_dev * rdev)189 static 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
222 static 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
251 static struct regulator_desc da9211_regulators[] = {
252 DA9211_BUCK(BUCKA),
253 DA9211_BUCK(BUCKB),
254 };
255
256 #ifdef CONFIG_OF
257 static struct of_regulator_match da9211_matches[] = {
258 [DA9211_ID_BUCKA] = { .name = "BUCKA" },
259 [DA9211_ID_BUCKB] = { .name = "BUCKB" },
260 };
261
da9211_parse_regulators_dt(struct device * dev)262 static 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->gpio_ren[n] =
297 of_get_named_gpio(da9211_matches[i].of_node,
298 "enable-gpios", 0);
299 n++;
300 }
301
302 return pdata;
303 }
304 #else
da9211_parse_regulators_dt(struct device * dev)305 static struct da9211_pdata *da9211_parse_regulators_dt(
306 struct device *dev)
307 {
308 return ERR_PTR(-ENODEV);
309 }
310 #endif
311
da9211_irq_handler(int irq,void * data)312 static irqreturn_t da9211_irq_handler(int irq, void *data)
313 {
314 struct da9211 *chip = data;
315 int reg_val, err, ret = IRQ_NONE;
316
317 err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val);
318 if (err < 0)
319 goto error_i2c;
320
321 if (reg_val & DA9211_E_OV_CURR_A) {
322 regulator_notifier_call_chain(chip->rdev[0],
323 REGULATOR_EVENT_OVER_CURRENT, NULL);
324
325 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
326 DA9211_E_OV_CURR_A);
327 if (err < 0)
328 goto error_i2c;
329
330 ret = IRQ_HANDLED;
331 }
332
333 if (reg_val & DA9211_E_OV_CURR_B) {
334 regulator_notifier_call_chain(chip->rdev[1],
335 REGULATOR_EVENT_OVER_CURRENT, NULL);
336
337 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
338 DA9211_E_OV_CURR_B);
339 if (err < 0)
340 goto error_i2c;
341
342 ret = IRQ_HANDLED;
343 }
344
345 return ret;
346
347 error_i2c:
348 dev_err(chip->dev, "I2C error : %d\n", err);
349 return IRQ_NONE;
350 }
351
da9211_regulator_init(struct da9211 * chip)352 static int da9211_regulator_init(struct da9211 *chip)
353 {
354 struct regulator_config config = { };
355 int i, ret;
356 unsigned int data;
357
358 ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
359 if (ret < 0) {
360 dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
361 return ret;
362 }
363
364 data &= DA9211_SLAVE_SEL;
365 /* If configuration for 1/2 bucks is different between platform data
366 * and the register, driver should exit.
367 */
368 if (chip->pdata->num_buck == 1 && data == 0x00)
369 chip->num_regulator = 1;
370 else if (chip->pdata->num_buck == 2 && data != 0x00)
371 chip->num_regulator = 2;
372 else {
373 dev_err(chip->dev, "Configuration is mismatched\n");
374 return -EINVAL;
375 }
376
377 for (i = 0; i < chip->num_regulator; i++) {
378 config.init_data = chip->pdata->init_data[i];
379 config.dev = chip->dev;
380 config.driver_data = chip;
381 config.regmap = chip->regmap;
382 config.of_node = chip->pdata->reg_node[i];
383
384 if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
385 config.ena_gpio = chip->pdata->gpio_ren[i];
386 config.ena_gpio_initialized = true;
387 } else {
388 config.ena_gpio = -EINVAL;
389 config.ena_gpio_initialized = false;
390 }
391
392 chip->rdev[i] = devm_regulator_register(chip->dev,
393 &da9211_regulators[i], &config);
394 if (IS_ERR(chip->rdev[i])) {
395 dev_err(chip->dev,
396 "Failed to register DA9211 regulator\n");
397 return PTR_ERR(chip->rdev[i]);
398 }
399
400 if (chip->chip_irq != 0) {
401 ret = regmap_update_bits(chip->regmap,
402 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
403 if (ret < 0) {
404 dev_err(chip->dev,
405 "Failed to update mask reg: %d\n", ret);
406 return ret;
407 }
408 }
409 }
410
411 return 0;
412 }
413
414 /*
415 * I2C driver interface functions
416 */
da9211_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)417 static int da9211_i2c_probe(struct i2c_client *i2c,
418 const struct i2c_device_id *id)
419 {
420 struct da9211 *chip;
421 int error, ret;
422 unsigned int data;
423
424 chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
425 if (!chip)
426 return -ENOMEM;
427
428 chip->dev = &i2c->dev;
429 chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
430 if (IS_ERR(chip->regmap)) {
431 error = PTR_ERR(chip->regmap);
432 dev_err(chip->dev, "Failed to allocate register map: %d\n",
433 error);
434 return error;
435 }
436
437 i2c_set_clientdata(i2c, chip);
438
439 chip->pdata = i2c->dev.platform_data;
440
441 ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
442 if (ret < 0) {
443 dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
444 return ret;
445 }
446
447 switch (data) {
448 case DA9211_DEVICE_ID:
449 chip->chip_id = DA9211;
450 break;
451 case DA9213_DEVICE_ID:
452 chip->chip_id = DA9213;
453 break;
454 case DA9215_DEVICE_ID:
455 chip->chip_id = DA9215;
456 break;
457 default:
458 dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
459 return -ENODEV;
460 }
461
462 if (!chip->pdata)
463 chip->pdata = da9211_parse_regulators_dt(chip->dev);
464
465 if (IS_ERR(chip->pdata)) {
466 dev_err(chip->dev, "No regulators defined for the platform\n");
467 return PTR_ERR(chip->pdata);
468 }
469
470 chip->chip_irq = i2c->irq;
471
472 if (chip->chip_irq != 0) {
473 ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
474 da9211_irq_handler,
475 IRQF_TRIGGER_LOW|IRQF_ONESHOT,
476 "da9211", chip);
477 if (ret != 0) {
478 dev_err(chip->dev, "Failed to request IRQ: %d\n",
479 chip->chip_irq);
480 return ret;
481 }
482 } else {
483 dev_warn(chip->dev, "No IRQ configured\n");
484 }
485
486 ret = da9211_regulator_init(chip);
487
488 if (ret < 0)
489 dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
490
491 return ret;
492 }
493
494 static const struct i2c_device_id da9211_i2c_id[] = {
495 {"da9211", DA9211},
496 {"da9213", DA9213},
497 {"da9215", DA9215},
498 {},
499 };
500 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
501
502 #ifdef CONFIG_OF
503 static const struct of_device_id da9211_dt_ids[] = {
504 { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
505 { .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] },
506 { .compatible = "dlg,da9215", .data = &da9211_i2c_id[2] },
507 {},
508 };
509 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
510 #endif
511
512 static struct i2c_driver da9211_regulator_driver = {
513 .driver = {
514 .name = "da9211",
515 .of_match_table = of_match_ptr(da9211_dt_ids),
516 },
517 .probe = da9211_i2c_probe,
518 .id_table = da9211_i2c_id,
519 };
520
521 module_i2c_driver(da9211_regulator_driver);
522
523 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
524 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213/DA9215");
525 MODULE_LICENSE("GPL");
526