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