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1028a37d | 1 | /* |
7bd39354 JB |
2 | * da9211-regulator.c - Regulator device driver for DA9211/DA9213/DA9215 |
3 | * Copyright (C) 2015 Dialog Semiconductor Ltd. | |
1028a37d JB |
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> | |
8c7dd8bc | 27 | #include <linux/of_gpio.h> |
bf3baca6 | 28 | #include <linux/regulator/of_regulator.h> |
1028a37d JB |
29 | #include <linux/regulator/da9211.h> |
30 | #include "da9211-regulator.h" | |
31 | ||
005547e0 JB |
32 | /* DEVICE IDs */ |
33 | #define DA9211_DEVICE_ID 0x22 | |
34 | #define DA9213_DEVICE_ID 0x23 | |
7bd39354 | 35 | #define DA9215_DEVICE_ID 0x24 |
005547e0 | 36 | |
1028a37d JB |
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; | |
005547e0 | 52 | int chip_id; |
1028a37d JB |
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, | |
005547e0 | 63 | .range_max = 5*128, |
1028a37d JB |
64 | }, |
65 | }; | |
66 | ||
67 | static const struct regmap_config da9211_regmap_config = { | |
68 | .reg_bits = 8, | |
69 | .val_bits = 8, | |
005547e0 | 70 | .max_register = 5 * 128, |
1028a37d JB |
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 | ||
005547e0 JB |
80 | /* Current limits for DA9211 buck (uA) indices |
81 | * corresponds with register values | |
82 | */ | |
1028a37d JB |
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 | }; | |
005547e0 JB |
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 | }; | |
7bd39354 JB |
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 | }; | |
1028a37d JB |
101 | |
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 | ||
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 | ||
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); | |
005547e0 JB |
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; | |
7bd39354 JB |
168 | case DA9215: |
169 | current_limits = da9215_current_limits; | |
170 | max_size = ARRAY_SIZE(da9215_current_limits)-1; | |
171 | break; | |
005547e0 JB |
172 | default: |
173 | return -EINVAL; | |
174 | } | |
1028a37d JB |
175 | |
176 | /* search for closest to maximum */ | |
005547e0 JB |
177 | for (i = max_size; i >= 0; i--) { |
178 | if (min <= current_limits[i] && | |
179 | max >= current_limits[i]) { | |
1028a37d JB |
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 | ||
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; | |
005547e0 JB |
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; | |
7bd39354 JB |
204 | case DA9215: |
205 | current_limits = da9215_current_limits; | |
206 | break; | |
005547e0 JB |
207 | default: |
208 | return -EINVAL; | |
209 | } | |
1028a37d JB |
210 | |
211 | ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data); | |
212 | if (ret < 0) | |
213 | return ret; | |
214 | ||
005547e0 JB |
215 | /* select one of 16 values: 0000 (2000mA or 3000mA) |
216 | * to 1111 (5000mA or 6000mA). | |
217 | */ | |
1028a37d | 218 | data = (data >> id*4) & 0x0F; |
005547e0 | 219 | return current_limits[data]; |
1028a37d JB |
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 | ||
bf3baca6 JB |
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 | ||
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; | |
076c3b8e | 295 | pdata->reg_node[n] = da9211_matches[i].of_node; |
8c7dd8bc JB |
296 | pdata->gpio_ren[n] = |
297 | of_get_named_gpio(da9211_matches[i].of_node, | |
298 | "enable-gpios", 0); | |
bf3baca6 | 299 | n++; |
c2a946e0 | 300 | } |
bf3baca6 JB |
301 | |
302 | return pdata; | |
303 | } | |
304 | #else | |
305 | static struct da9211_pdata *da9211_parse_regulators_dt( | |
306 | struct device *dev) | |
307 | { | |
308 | return ERR_PTR(-ENODEV); | |
309 | } | |
310 | #endif | |
311 | ||
1028a37d JB |
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], | |
a46a0730 | 323 | REGULATOR_EVENT_OVER_CURRENT, NULL); |
1028a37d JB |
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], | |
a46a0730 | 335 | REGULATOR_EVENT_OVER_CURRENT, NULL); |
1028a37d JB |
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 | ||
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) { | |
767e8aab | 360 | dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret); |
516c1514 | 361 | return ret; |
1028a37d JB |
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 | */ | |
7bd39354 JB |
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 { | |
1028a37d | 373 | dev_err(chip->dev, "Configuration is mismatched\n"); |
516c1514 | 374 | return -EINVAL; |
1028a37d JB |
375 | } |
376 | ||
377 | for (i = 0; i < chip->num_regulator; i++) { | |
bf3baca6 | 378 | config.init_data = chip->pdata->init_data[i]; |
1028a37d JB |
379 | config.dev = chip->dev; |
380 | config.driver_data = chip; | |
381 | config.regmap = chip->regmap; | |
076c3b8e | 382 | config.of_node = chip->pdata->reg_node[i]; |
1028a37d | 383 | |
8c7dd8bc JB |
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 | ||
1028a37d JB |
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"); | |
516c1514 | 397 | return PTR_ERR(chip->rdev[i]); |
1028a37d JB |
398 | } |
399 | ||
400 | if (chip->chip_irq != 0) { | |
401 | ret = regmap_update_bits(chip->regmap, | |
4e7089f3 | 402 | DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0); |
1028a37d JB |
403 | if (ret < 0) { |
404 | dev_err(chip->dev, | |
405 | "Failed to update mask reg: %d\n", ret); | |
516c1514 | 406 | return ret; |
1028a37d JB |
407 | } |
408 | } | |
409 | } | |
410 | ||
411 | return 0; | |
1028a37d | 412 | } |
bf3baca6 | 413 | |
1028a37d JB |
414 | /* |
415 | * I2C driver interface functions | |
416 | */ | |
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; | |
005547e0 | 422 | unsigned int data; |
1028a37d JB |
423 | |
424 | chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL); | |
1d3e6a69 AL |
425 | if (!chip) |
426 | return -ENOMEM; | |
1028a37d JB |
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); | |
005547e0 | 432 | dev_err(chip->dev, "Failed to allocate register map: %d\n", |
1028a37d JB |
433 | error); |
434 | return error; | |
435 | } | |
436 | ||
437 | i2c_set_clientdata(i2c, chip); | |
438 | ||
439 | chip->pdata = i2c->dev.platform_data; | |
005547e0 JB |
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; | |
7bd39354 JB |
454 | case DA9215_DEVICE_ID: |
455 | chip->chip_id = DA9215; | |
456 | break; | |
005547e0 JB |
457 | default: |
458 | dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data); | |
1028a37d JB |
459 | return -ENODEV; |
460 | } | |
461 | ||
bf3baca6 JB |
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 | ||
1028a37d JB |
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) | |
005547e0 | 489 | dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret); |
1028a37d JB |
490 | |
491 | return ret; | |
492 | } | |
493 | ||
1028a37d | 494 | static const struct i2c_device_id da9211_i2c_id[] = { |
6a52f563 AL |
495 | {"da9211", DA9211}, |
496 | {"da9213", DA9213}, | |
7bd39354 | 497 | {"da9215", DA9215}, |
1028a37d JB |
498 | {}, |
499 | }; | |
1028a37d JB |
500 | MODULE_DEVICE_TABLE(i2c, da9211_i2c_id); |
501 | ||
6a52f563 AL |
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] }, | |
7bd39354 | 506 | { .compatible = "dlg,da9215", .data = &da9211_i2c_id[2] }, |
6a52f563 AL |
507 | {}, |
508 | }; | |
509 | MODULE_DEVICE_TABLE(of, da9211_dt_ids); | |
510 | #endif | |
511 | ||
1028a37d JB |
512 | static struct i2c_driver da9211_regulator_driver = { |
513 | .driver = { | |
514 | .name = "da9211", | |
6a52f563 | 515 | .of_match_table = of_match_ptr(da9211_dt_ids), |
1028a37d JB |
516 | }, |
517 | .probe = da9211_i2c_probe, | |
1028a37d JB |
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>"); | |
7bd39354 JB |
524 | MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213/DA9215"); |
525 | MODULE_LICENSE("GPL"); |