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1028a37d | 1 | /* |
005547e0 | 2 | * da9211-regulator.c - Regulator device driver for DA9211/DA9213 |
1028a37d JB |
3 | * Copyright (C) 2014 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> | |
bf3baca6 | 27 | #include <linux/regulator/of_regulator.h> |
1028a37d JB |
28 | #include <linux/regulator/da9211.h> |
29 | #include "da9211-regulator.h" | |
30 | ||
005547e0 JB |
31 | /* DEVICE IDs */ |
32 | #define DA9211_DEVICE_ID 0x22 | |
33 | #define DA9213_DEVICE_ID 0x23 | |
34 | ||
1028a37d JB |
35 | #define DA9211_BUCK_MODE_SLEEP 1 |
36 | #define DA9211_BUCK_MODE_SYNC 2 | |
37 | #define DA9211_BUCK_MODE_AUTO 3 | |
38 | ||
39 | /* DA9211 REGULATOR IDs */ | |
40 | #define DA9211_ID_BUCKA 0 | |
41 | #define DA9211_ID_BUCKB 1 | |
42 | ||
43 | struct da9211 { | |
44 | struct device *dev; | |
45 | struct regmap *regmap; | |
46 | struct da9211_pdata *pdata; | |
47 | struct regulator_dev *rdev[DA9211_MAX_REGULATORS]; | |
48 | int num_regulator; | |
49 | int chip_irq; | |
005547e0 | 50 | int chip_id; |
1028a37d JB |
51 | }; |
52 | ||
53 | static const struct regmap_range_cfg da9211_regmap_range[] = { | |
54 | { | |
55 | .selector_reg = DA9211_REG_PAGE_CON, | |
56 | .selector_mask = DA9211_REG_PAGE_MASK, | |
57 | .selector_shift = DA9211_REG_PAGE_SHIFT, | |
58 | .window_start = 0, | |
59 | .window_len = 256, | |
60 | .range_min = 0, | |
005547e0 | 61 | .range_max = 5*128, |
1028a37d JB |
62 | }, |
63 | }; | |
64 | ||
65 | static const struct regmap_config da9211_regmap_config = { | |
66 | .reg_bits = 8, | |
67 | .val_bits = 8, | |
005547e0 | 68 | .max_register = 5 * 128, |
1028a37d JB |
69 | .ranges = da9211_regmap_range, |
70 | .num_ranges = ARRAY_SIZE(da9211_regmap_range), | |
71 | }; | |
72 | ||
73 | /* Default limits measured in millivolts and milliamps */ | |
74 | #define DA9211_MIN_MV 300 | |
75 | #define DA9211_MAX_MV 1570 | |
76 | #define DA9211_STEP_MV 10 | |
77 | ||
005547e0 JB |
78 | /* Current limits for DA9211 buck (uA) indices |
79 | * corresponds with register values | |
80 | */ | |
1028a37d JB |
81 | static const int da9211_current_limits[] = { |
82 | 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, | |
83 | 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000 | |
84 | }; | |
005547e0 JB |
85 | /* Current limits for DA9213 buck (uA) indices |
86 | * corresponds with register values | |
87 | */ | |
88 | static const int da9213_current_limits[] = { | |
89 | 3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, | |
90 | 4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000 | |
91 | }; | |
1028a37d JB |
92 | |
93 | static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev) | |
94 | { | |
95 | int id = rdev_get_id(rdev); | |
96 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
97 | unsigned int data; | |
98 | int ret, mode = 0; | |
99 | ||
100 | ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data); | |
101 | if (ret < 0) | |
102 | return ret; | |
103 | ||
104 | switch (data & 0x03) { | |
105 | case DA9211_BUCK_MODE_SYNC: | |
106 | mode = REGULATOR_MODE_FAST; | |
107 | break; | |
108 | case DA9211_BUCK_MODE_AUTO: | |
109 | mode = REGULATOR_MODE_NORMAL; | |
110 | break; | |
111 | case DA9211_BUCK_MODE_SLEEP: | |
112 | mode = REGULATOR_MODE_STANDBY; | |
113 | break; | |
114 | } | |
115 | ||
116 | return mode; | |
117 | } | |
118 | ||
119 | static int da9211_buck_set_mode(struct regulator_dev *rdev, | |
120 | unsigned int mode) | |
121 | { | |
122 | int id = rdev_get_id(rdev); | |
123 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
124 | int val = 0; | |
125 | ||
126 | switch (mode) { | |
127 | case REGULATOR_MODE_FAST: | |
128 | val = DA9211_BUCK_MODE_SYNC; | |
129 | break; | |
130 | case REGULATOR_MODE_NORMAL: | |
131 | val = DA9211_BUCK_MODE_AUTO; | |
132 | break; | |
133 | case REGULATOR_MODE_STANDBY: | |
134 | val = DA9211_BUCK_MODE_SLEEP; | |
135 | break; | |
136 | } | |
137 | ||
138 | return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id, | |
139 | 0x03, val); | |
140 | } | |
141 | ||
142 | static int da9211_set_current_limit(struct regulator_dev *rdev, int min, | |
143 | int max) | |
144 | { | |
145 | int id = rdev_get_id(rdev); | |
146 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
005547e0 JB |
147 | int i, max_size; |
148 | const int *current_limits; | |
149 | ||
150 | switch (chip->chip_id) { | |
151 | case DA9211: | |
152 | current_limits = da9211_current_limits; | |
153 | max_size = ARRAY_SIZE(da9211_current_limits)-1; | |
154 | break; | |
155 | case DA9213: | |
156 | current_limits = da9213_current_limits; | |
157 | max_size = ARRAY_SIZE(da9213_current_limits)-1; | |
158 | break; | |
159 | default: | |
160 | return -EINVAL; | |
161 | } | |
1028a37d JB |
162 | |
163 | /* search for closest to maximum */ | |
005547e0 JB |
164 | for (i = max_size; i >= 0; i--) { |
165 | if (min <= current_limits[i] && | |
166 | max >= current_limits[i]) { | |
1028a37d JB |
167 | return regmap_update_bits(chip->regmap, |
168 | DA9211_REG_BUCK_ILIM, | |
169 | (0x0F << id*4), (i << id*4)); | |
170 | } | |
171 | } | |
172 | ||
173 | return -EINVAL; | |
174 | } | |
175 | ||
176 | static int da9211_get_current_limit(struct regulator_dev *rdev) | |
177 | { | |
178 | int id = rdev_get_id(rdev); | |
179 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
180 | unsigned int data; | |
181 | int ret; | |
005547e0 JB |
182 | const int *current_limits; |
183 | ||
184 | switch (chip->chip_id) { | |
185 | case DA9211: | |
186 | current_limits = da9211_current_limits; | |
187 | break; | |
188 | case DA9213: | |
189 | current_limits = da9213_current_limits; | |
190 | break; | |
191 | default: | |
192 | return -EINVAL; | |
193 | } | |
1028a37d JB |
194 | |
195 | ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data); | |
196 | if (ret < 0) | |
197 | return ret; | |
198 | ||
005547e0 JB |
199 | /* select one of 16 values: 0000 (2000mA or 3000mA) |
200 | * to 1111 (5000mA or 6000mA). | |
201 | */ | |
1028a37d | 202 | data = (data >> id*4) & 0x0F; |
005547e0 | 203 | return current_limits[data]; |
1028a37d JB |
204 | } |
205 | ||
206 | static struct regulator_ops da9211_buck_ops = { | |
207 | .get_mode = da9211_buck_get_mode, | |
208 | .set_mode = da9211_buck_set_mode, | |
209 | .enable = regulator_enable_regmap, | |
210 | .disable = regulator_disable_regmap, | |
211 | .is_enabled = regulator_is_enabled_regmap, | |
212 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
213 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
214 | .list_voltage = regulator_list_voltage_linear, | |
215 | .set_current_limit = da9211_set_current_limit, | |
216 | .get_current_limit = da9211_get_current_limit, | |
217 | }; | |
218 | ||
219 | #define DA9211_BUCK(_id) \ | |
220 | {\ | |
221 | .name = #_id,\ | |
222 | .ops = &da9211_buck_ops,\ | |
223 | .type = REGULATOR_VOLTAGE,\ | |
224 | .id = DA9211_ID_##_id,\ | |
225 | .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\ | |
226 | .min_uV = (DA9211_MIN_MV * 1000),\ | |
227 | .uV_step = (DA9211_STEP_MV * 1000),\ | |
228 | .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\ | |
229 | .enable_mask = DA9211_BUCKA_EN,\ | |
230 | .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\ | |
231 | .vsel_mask = DA9211_VBUCK_MASK,\ | |
232 | .owner = THIS_MODULE,\ | |
233 | } | |
234 | ||
235 | static struct regulator_desc da9211_regulators[] = { | |
236 | DA9211_BUCK(BUCKA), | |
237 | DA9211_BUCK(BUCKB), | |
238 | }; | |
239 | ||
bf3baca6 JB |
240 | #ifdef CONFIG_OF |
241 | static struct of_regulator_match da9211_matches[] = { | |
242 | [DA9211_ID_BUCKA] = { .name = "BUCKA" }, | |
243 | [DA9211_ID_BUCKB] = { .name = "BUCKB" }, | |
244 | }; | |
245 | ||
246 | static struct da9211_pdata *da9211_parse_regulators_dt( | |
247 | struct device *dev) | |
248 | { | |
249 | struct da9211_pdata *pdata; | |
250 | struct device_node *node; | |
251 | int i, num, n; | |
252 | ||
253 | node = of_get_child_by_name(dev->of_node, "regulators"); | |
254 | if (!node) { | |
255 | dev_err(dev, "regulators node not found\n"); | |
256 | return ERR_PTR(-ENODEV); | |
257 | } | |
258 | ||
259 | num = of_regulator_match(dev, node, da9211_matches, | |
260 | ARRAY_SIZE(da9211_matches)); | |
261 | of_node_put(node); | |
262 | if (num < 0) { | |
263 | dev_err(dev, "Failed to match regulators\n"); | |
264 | return ERR_PTR(-EINVAL); | |
265 | } | |
266 | ||
267 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
268 | if (!pdata) | |
269 | return ERR_PTR(-ENOMEM); | |
270 | ||
271 | pdata->num_buck = num; | |
272 | ||
273 | n = 0; | |
274 | for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) { | |
275 | if (!da9211_matches[i].init_data) | |
276 | continue; | |
277 | ||
278 | pdata->init_data[n] = da9211_matches[i].init_data; | |
279 | ||
280 | n++; | |
c2a946e0 | 281 | } |
bf3baca6 JB |
282 | |
283 | return pdata; | |
284 | } | |
285 | #else | |
286 | static struct da9211_pdata *da9211_parse_regulators_dt( | |
287 | struct device *dev) | |
288 | { | |
289 | return ERR_PTR(-ENODEV); | |
290 | } | |
291 | #endif | |
292 | ||
1028a37d JB |
293 | static irqreturn_t da9211_irq_handler(int irq, void *data) |
294 | { | |
295 | struct da9211 *chip = data; | |
296 | int reg_val, err, ret = IRQ_NONE; | |
297 | ||
298 | err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val); | |
299 | if (err < 0) | |
300 | goto error_i2c; | |
301 | ||
302 | if (reg_val & DA9211_E_OV_CURR_A) { | |
303 | regulator_notifier_call_chain(chip->rdev[0], | |
304 | REGULATOR_EVENT_OVER_CURRENT, | |
305 | rdev_get_drvdata(chip->rdev[0])); | |
306 | ||
307 | err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, | |
308 | DA9211_E_OV_CURR_A); | |
309 | if (err < 0) | |
310 | goto error_i2c; | |
311 | ||
312 | ret = IRQ_HANDLED; | |
313 | } | |
314 | ||
315 | if (reg_val & DA9211_E_OV_CURR_B) { | |
316 | regulator_notifier_call_chain(chip->rdev[1], | |
317 | REGULATOR_EVENT_OVER_CURRENT, | |
318 | rdev_get_drvdata(chip->rdev[1])); | |
319 | ||
320 | err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, | |
321 | DA9211_E_OV_CURR_B); | |
322 | if (err < 0) | |
323 | goto error_i2c; | |
324 | ||
325 | ret = IRQ_HANDLED; | |
326 | } | |
327 | ||
328 | return ret; | |
329 | ||
330 | error_i2c: | |
331 | dev_err(chip->dev, "I2C error : %d\n", err); | |
332 | return IRQ_NONE; | |
333 | } | |
334 | ||
335 | static int da9211_regulator_init(struct da9211 *chip) | |
336 | { | |
337 | struct regulator_config config = { }; | |
338 | int i, ret; | |
339 | unsigned int data; | |
340 | ||
341 | ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data); | |
342 | if (ret < 0) { | |
343 | dev_err(chip->dev, "Failed to read CONTROL_E reg: %d\n", ret); | |
516c1514 | 344 | return ret; |
1028a37d JB |
345 | } |
346 | ||
347 | data &= DA9211_SLAVE_SEL; | |
348 | /* If configuration for 1/2 bucks is different between platform data | |
349 | * and the register, driver should exit. | |
350 | */ | |
351 | if ((chip->pdata->num_buck == 2 && data == 0x40) | |
352 | || (chip->pdata->num_buck == 1 && data == 0x00)) { | |
353 | if (data == 0) | |
354 | chip->num_regulator = 1; | |
355 | else | |
356 | chip->num_regulator = 2; | |
357 | } else { | |
1028a37d | 358 | dev_err(chip->dev, "Configuration is mismatched\n"); |
516c1514 | 359 | return -EINVAL; |
1028a37d JB |
360 | } |
361 | ||
362 | for (i = 0; i < chip->num_regulator; i++) { | |
bf3baca6 | 363 | config.init_data = chip->pdata->init_data[i]; |
1028a37d JB |
364 | config.dev = chip->dev; |
365 | config.driver_data = chip; | |
366 | config.regmap = chip->regmap; | |
67c866cf | 367 | config.of_node = chip->dev->of_node; |
1028a37d JB |
368 | |
369 | chip->rdev[i] = devm_regulator_register(chip->dev, | |
370 | &da9211_regulators[i], &config); | |
371 | if (IS_ERR(chip->rdev[i])) { | |
372 | dev_err(chip->dev, | |
373 | "Failed to register DA9211 regulator\n"); | |
516c1514 | 374 | return PTR_ERR(chip->rdev[i]); |
1028a37d JB |
375 | } |
376 | ||
377 | if (chip->chip_irq != 0) { | |
378 | ret = regmap_update_bits(chip->regmap, | |
4e7089f3 | 379 | DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0); |
1028a37d JB |
380 | if (ret < 0) { |
381 | dev_err(chip->dev, | |
382 | "Failed to update mask reg: %d\n", ret); | |
516c1514 | 383 | return ret; |
1028a37d JB |
384 | } |
385 | } | |
386 | } | |
387 | ||
388 | return 0; | |
1028a37d | 389 | } |
bf3baca6 | 390 | |
1028a37d JB |
391 | /* |
392 | * I2C driver interface functions | |
393 | */ | |
394 | static int da9211_i2c_probe(struct i2c_client *i2c, | |
395 | const struct i2c_device_id *id) | |
396 | { | |
397 | struct da9211 *chip; | |
398 | int error, ret; | |
005547e0 | 399 | unsigned int data; |
1028a37d JB |
400 | |
401 | chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL); | |
1d3e6a69 AL |
402 | if (!chip) |
403 | return -ENOMEM; | |
1028a37d JB |
404 | |
405 | chip->dev = &i2c->dev; | |
406 | chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config); | |
407 | if (IS_ERR(chip->regmap)) { | |
408 | error = PTR_ERR(chip->regmap); | |
005547e0 | 409 | dev_err(chip->dev, "Failed to allocate register map: %d\n", |
1028a37d JB |
410 | error); |
411 | return error; | |
412 | } | |
413 | ||
414 | i2c_set_clientdata(i2c, chip); | |
415 | ||
416 | chip->pdata = i2c->dev.platform_data; | |
005547e0 JB |
417 | |
418 | ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data); | |
419 | if (ret < 0) { | |
420 | dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret); | |
421 | return ret; | |
422 | } | |
423 | ||
424 | switch (data) { | |
425 | case DA9211_DEVICE_ID: | |
426 | chip->chip_id = DA9211; | |
427 | break; | |
428 | case DA9213_DEVICE_ID: | |
429 | chip->chip_id = DA9213; | |
430 | break; | |
431 | default: | |
432 | dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data); | |
1028a37d JB |
433 | return -ENODEV; |
434 | } | |
435 | ||
bf3baca6 JB |
436 | if (!chip->pdata) |
437 | chip->pdata = da9211_parse_regulators_dt(chip->dev); | |
438 | ||
439 | if (IS_ERR(chip->pdata)) { | |
440 | dev_err(chip->dev, "No regulators defined for the platform\n"); | |
441 | return PTR_ERR(chip->pdata); | |
442 | } | |
443 | ||
1028a37d JB |
444 | chip->chip_irq = i2c->irq; |
445 | ||
446 | if (chip->chip_irq != 0) { | |
447 | ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL, | |
448 | da9211_irq_handler, | |
449 | IRQF_TRIGGER_LOW|IRQF_ONESHOT, | |
450 | "da9211", chip); | |
451 | if (ret != 0) { | |
452 | dev_err(chip->dev, "Failed to request IRQ: %d\n", | |
453 | chip->chip_irq); | |
454 | return ret; | |
455 | } | |
456 | } else { | |
457 | dev_warn(chip->dev, "No IRQ configured\n"); | |
458 | } | |
459 | ||
460 | ret = da9211_regulator_init(chip); | |
461 | ||
462 | if (ret < 0) | |
005547e0 | 463 | dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret); |
1028a37d JB |
464 | |
465 | return ret; | |
466 | } | |
467 | ||
1028a37d | 468 | static const struct i2c_device_id da9211_i2c_id[] = { |
6a52f563 AL |
469 | {"da9211", DA9211}, |
470 | {"da9213", DA9213}, | |
1028a37d JB |
471 | {}, |
472 | }; | |
1028a37d JB |
473 | MODULE_DEVICE_TABLE(i2c, da9211_i2c_id); |
474 | ||
6a52f563 AL |
475 | #ifdef CONFIG_OF |
476 | static const struct of_device_id da9211_dt_ids[] = { | |
477 | { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] }, | |
478 | { .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] }, | |
479 | {}, | |
480 | }; | |
481 | MODULE_DEVICE_TABLE(of, da9211_dt_ids); | |
482 | #endif | |
483 | ||
1028a37d JB |
484 | static struct i2c_driver da9211_regulator_driver = { |
485 | .driver = { | |
486 | .name = "da9211", | |
487 | .owner = THIS_MODULE, | |
6a52f563 | 488 | .of_match_table = of_match_ptr(da9211_dt_ids), |
1028a37d JB |
489 | }, |
490 | .probe = da9211_i2c_probe, | |
1028a37d JB |
491 | .id_table = da9211_i2c_id, |
492 | }; | |
493 | ||
494 | module_i2c_driver(da9211_regulator_driver); | |
495 | ||
496 | MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); | |
005547e0 | 497 | MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213"); |
1028a37d | 498 | MODULE_LICENSE("GPL v2"); |