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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> | |
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 | |
35 | ||
1028a37d JB |
36 | #define DA9211_BUCK_MODE_SLEEP 1 |
37 | #define DA9211_BUCK_MODE_SYNC 2 | |
38 | #define DA9211_BUCK_MODE_AUTO 3 | |
39 | ||
40 | /* DA9211 REGULATOR IDs */ | |
41 | #define DA9211_ID_BUCKA 0 | |
42 | #define DA9211_ID_BUCKB 1 | |
43 | ||
44 | struct da9211 { | |
45 | struct device *dev; | |
46 | struct regmap *regmap; | |
47 | struct da9211_pdata *pdata; | |
48 | struct regulator_dev *rdev[DA9211_MAX_REGULATORS]; | |
49 | int num_regulator; | |
50 | int chip_irq; | |
005547e0 | 51 | int chip_id; |
1028a37d JB |
52 | }; |
53 | ||
54 | static const struct regmap_range_cfg da9211_regmap_range[] = { | |
55 | { | |
56 | .selector_reg = DA9211_REG_PAGE_CON, | |
57 | .selector_mask = DA9211_REG_PAGE_MASK, | |
58 | .selector_shift = DA9211_REG_PAGE_SHIFT, | |
59 | .window_start = 0, | |
60 | .window_len = 256, | |
61 | .range_min = 0, | |
005547e0 | 62 | .range_max = 5*128, |
1028a37d JB |
63 | }, |
64 | }; | |
65 | ||
66 | static const struct regmap_config da9211_regmap_config = { | |
67 | .reg_bits = 8, | |
68 | .val_bits = 8, | |
005547e0 | 69 | .max_register = 5 * 128, |
1028a37d JB |
70 | .ranges = da9211_regmap_range, |
71 | .num_ranges = ARRAY_SIZE(da9211_regmap_range), | |
72 | }; | |
73 | ||
74 | /* Default limits measured in millivolts and milliamps */ | |
75 | #define DA9211_MIN_MV 300 | |
76 | #define DA9211_MAX_MV 1570 | |
77 | #define DA9211_STEP_MV 10 | |
78 | ||
005547e0 JB |
79 | /* Current limits for DA9211 buck (uA) indices |
80 | * corresponds with register values | |
81 | */ | |
1028a37d JB |
82 | static const int da9211_current_limits[] = { |
83 | 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, | |
84 | 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000 | |
85 | }; | |
005547e0 JB |
86 | /* Current limits for DA9213 buck (uA) indices |
87 | * corresponds with register values | |
88 | */ | |
89 | static const int da9213_current_limits[] = { | |
90 | 3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, | |
91 | 4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000 | |
92 | }; | |
1028a37d JB |
93 | |
94 | static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev) | |
95 | { | |
96 | int id = rdev_get_id(rdev); | |
97 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
98 | unsigned int data; | |
99 | int ret, mode = 0; | |
100 | ||
101 | ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data); | |
102 | if (ret < 0) | |
103 | return ret; | |
104 | ||
105 | switch (data & 0x03) { | |
106 | case DA9211_BUCK_MODE_SYNC: | |
107 | mode = REGULATOR_MODE_FAST; | |
108 | break; | |
109 | case DA9211_BUCK_MODE_AUTO: | |
110 | mode = REGULATOR_MODE_NORMAL; | |
111 | break; | |
112 | case DA9211_BUCK_MODE_SLEEP: | |
113 | mode = REGULATOR_MODE_STANDBY; | |
114 | break; | |
115 | } | |
116 | ||
117 | return mode; | |
118 | } | |
119 | ||
120 | static int da9211_buck_set_mode(struct regulator_dev *rdev, | |
121 | unsigned int mode) | |
122 | { | |
123 | int id = rdev_get_id(rdev); | |
124 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
125 | int val = 0; | |
126 | ||
127 | switch (mode) { | |
128 | case REGULATOR_MODE_FAST: | |
129 | val = DA9211_BUCK_MODE_SYNC; | |
130 | break; | |
131 | case REGULATOR_MODE_NORMAL: | |
132 | val = DA9211_BUCK_MODE_AUTO; | |
133 | break; | |
134 | case REGULATOR_MODE_STANDBY: | |
135 | val = DA9211_BUCK_MODE_SLEEP; | |
136 | break; | |
137 | } | |
138 | ||
139 | return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id, | |
140 | 0x03, val); | |
141 | } | |
142 | ||
143 | static int da9211_set_current_limit(struct regulator_dev *rdev, int min, | |
144 | int max) | |
145 | { | |
146 | int id = rdev_get_id(rdev); | |
147 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
005547e0 JB |
148 | int i, max_size; |
149 | const int *current_limits; | |
150 | ||
151 | switch (chip->chip_id) { | |
152 | case DA9211: | |
153 | current_limits = da9211_current_limits; | |
154 | max_size = ARRAY_SIZE(da9211_current_limits)-1; | |
155 | break; | |
156 | case DA9213: | |
157 | current_limits = da9213_current_limits; | |
158 | max_size = ARRAY_SIZE(da9213_current_limits)-1; | |
159 | break; | |
160 | default: | |
161 | return -EINVAL; | |
162 | } | |
1028a37d JB |
163 | |
164 | /* search for closest to maximum */ | |
005547e0 JB |
165 | for (i = max_size; i >= 0; i--) { |
166 | if (min <= current_limits[i] && | |
167 | max >= current_limits[i]) { | |
1028a37d JB |
168 | return regmap_update_bits(chip->regmap, |
169 | DA9211_REG_BUCK_ILIM, | |
170 | (0x0F << id*4), (i << id*4)); | |
171 | } | |
172 | } | |
173 | ||
174 | return -EINVAL; | |
175 | } | |
176 | ||
177 | static int da9211_get_current_limit(struct regulator_dev *rdev) | |
178 | { | |
179 | int id = rdev_get_id(rdev); | |
180 | struct da9211 *chip = rdev_get_drvdata(rdev); | |
181 | unsigned int data; | |
182 | int ret; | |
005547e0 JB |
183 | const int *current_limits; |
184 | ||
185 | switch (chip->chip_id) { | |
186 | case DA9211: | |
187 | current_limits = da9211_current_limits; | |
188 | break; | |
189 | case DA9213: | |
190 | current_limits = da9213_current_limits; | |
191 | break; | |
192 | default: | |
193 | return -EINVAL; | |
194 | } | |
1028a37d JB |
195 | |
196 | ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data); | |
197 | if (ret < 0) | |
198 | return ret; | |
199 | ||
005547e0 JB |
200 | /* select one of 16 values: 0000 (2000mA or 3000mA) |
201 | * to 1111 (5000mA or 6000mA). | |
202 | */ | |
1028a37d | 203 | data = (data >> id*4) & 0x0F; |
005547e0 | 204 | return current_limits[data]; |
1028a37d JB |
205 | } |
206 | ||
207 | static struct regulator_ops da9211_buck_ops = { | |
208 | .get_mode = da9211_buck_get_mode, | |
209 | .set_mode = da9211_buck_set_mode, | |
210 | .enable = regulator_enable_regmap, | |
211 | .disable = regulator_disable_regmap, | |
212 | .is_enabled = regulator_is_enabled_regmap, | |
213 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
214 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
215 | .list_voltage = regulator_list_voltage_linear, | |
216 | .set_current_limit = da9211_set_current_limit, | |
217 | .get_current_limit = da9211_get_current_limit, | |
218 | }; | |
219 | ||
220 | #define DA9211_BUCK(_id) \ | |
221 | {\ | |
222 | .name = #_id,\ | |
223 | .ops = &da9211_buck_ops,\ | |
224 | .type = REGULATOR_VOLTAGE,\ | |
225 | .id = DA9211_ID_##_id,\ | |
226 | .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\ | |
227 | .min_uV = (DA9211_MIN_MV * 1000),\ | |
228 | .uV_step = (DA9211_STEP_MV * 1000),\ | |
229 | .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\ | |
230 | .enable_mask = DA9211_BUCKA_EN,\ | |
231 | .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\ | |
232 | .vsel_mask = DA9211_VBUCK_MASK,\ | |
233 | .owner = THIS_MODULE,\ | |
234 | } | |
235 | ||
236 | static struct regulator_desc da9211_regulators[] = { | |
237 | DA9211_BUCK(BUCKA), | |
238 | DA9211_BUCK(BUCKB), | |
239 | }; | |
240 | ||
bf3baca6 JB |
241 | #ifdef CONFIG_OF |
242 | static struct of_regulator_match da9211_matches[] = { | |
243 | [DA9211_ID_BUCKA] = { .name = "BUCKA" }, | |
244 | [DA9211_ID_BUCKB] = { .name = "BUCKB" }, | |
245 | }; | |
246 | ||
247 | static struct da9211_pdata *da9211_parse_regulators_dt( | |
248 | struct device *dev) | |
249 | { | |
250 | struct da9211_pdata *pdata; | |
251 | struct device_node *node; | |
252 | int i, num, n; | |
253 | ||
254 | node = of_get_child_by_name(dev->of_node, "regulators"); | |
255 | if (!node) { | |
256 | dev_err(dev, "regulators node not found\n"); | |
257 | return ERR_PTR(-ENODEV); | |
258 | } | |
259 | ||
260 | num = of_regulator_match(dev, node, da9211_matches, | |
261 | ARRAY_SIZE(da9211_matches)); | |
262 | of_node_put(node); | |
263 | if (num < 0) { | |
264 | dev_err(dev, "Failed to match regulators\n"); | |
265 | return ERR_PTR(-EINVAL); | |
266 | } | |
267 | ||
268 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
269 | if (!pdata) | |
270 | return ERR_PTR(-ENOMEM); | |
271 | ||
272 | pdata->num_buck = num; | |
273 | ||
274 | n = 0; | |
275 | for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) { | |
276 | if (!da9211_matches[i].init_data) | |
277 | continue; | |
278 | ||
279 | pdata->init_data[n] = da9211_matches[i].init_data; | |
076c3b8e | 280 | pdata->reg_node[n] = da9211_matches[i].of_node; |
8c7dd8bc JB |
281 | pdata->gpio_ren[n] = |
282 | of_get_named_gpio(da9211_matches[i].of_node, | |
283 | "enable-gpios", 0); | |
bf3baca6 | 284 | n++; |
c2a946e0 | 285 | } |
bf3baca6 JB |
286 | |
287 | return pdata; | |
288 | } | |
289 | #else | |
290 | static struct da9211_pdata *da9211_parse_regulators_dt( | |
291 | struct device *dev) | |
292 | { | |
293 | return ERR_PTR(-ENODEV); | |
294 | } | |
295 | #endif | |
296 | ||
1028a37d JB |
297 | static irqreturn_t da9211_irq_handler(int irq, void *data) |
298 | { | |
299 | struct da9211 *chip = data; | |
300 | int reg_val, err, ret = IRQ_NONE; | |
301 | ||
302 | err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val); | |
303 | if (err < 0) | |
304 | goto error_i2c; | |
305 | ||
306 | if (reg_val & DA9211_E_OV_CURR_A) { | |
307 | regulator_notifier_call_chain(chip->rdev[0], | |
308 | REGULATOR_EVENT_OVER_CURRENT, | |
309 | rdev_get_drvdata(chip->rdev[0])); | |
310 | ||
311 | err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, | |
312 | DA9211_E_OV_CURR_A); | |
313 | if (err < 0) | |
314 | goto error_i2c; | |
315 | ||
316 | ret = IRQ_HANDLED; | |
317 | } | |
318 | ||
319 | if (reg_val & DA9211_E_OV_CURR_B) { | |
320 | regulator_notifier_call_chain(chip->rdev[1], | |
321 | REGULATOR_EVENT_OVER_CURRENT, | |
322 | rdev_get_drvdata(chip->rdev[1])); | |
323 | ||
324 | err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, | |
325 | DA9211_E_OV_CURR_B); | |
326 | if (err < 0) | |
327 | goto error_i2c; | |
328 | ||
329 | ret = IRQ_HANDLED; | |
330 | } | |
331 | ||
332 | return ret; | |
333 | ||
334 | error_i2c: | |
335 | dev_err(chip->dev, "I2C error : %d\n", err); | |
336 | return IRQ_NONE; | |
337 | } | |
338 | ||
339 | static int da9211_regulator_init(struct da9211 *chip) | |
340 | { | |
341 | struct regulator_config config = { }; | |
342 | int i, ret; | |
343 | unsigned int data; | |
344 | ||
345 | ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data); | |
346 | if (ret < 0) { | |
347 | dev_err(chip->dev, "Failed to read CONTROL_E reg: %d\n", ret); | |
516c1514 | 348 | return ret; |
1028a37d JB |
349 | } |
350 | ||
351 | data &= DA9211_SLAVE_SEL; | |
352 | /* If configuration for 1/2 bucks is different between platform data | |
353 | * and the register, driver should exit. | |
354 | */ | |
355 | if ((chip->pdata->num_buck == 2 && data == 0x40) | |
356 | || (chip->pdata->num_buck == 1 && data == 0x00)) { | |
357 | if (data == 0) | |
358 | chip->num_regulator = 1; | |
359 | else | |
360 | chip->num_regulator = 2; | |
361 | } else { | |
1028a37d | 362 | dev_err(chip->dev, "Configuration is mismatched\n"); |
516c1514 | 363 | return -EINVAL; |
1028a37d JB |
364 | } |
365 | ||
366 | for (i = 0; i < chip->num_regulator; i++) { | |
bf3baca6 | 367 | config.init_data = chip->pdata->init_data[i]; |
1028a37d JB |
368 | config.dev = chip->dev; |
369 | config.driver_data = chip; | |
370 | config.regmap = chip->regmap; | |
076c3b8e | 371 | config.of_node = chip->pdata->reg_node[i]; |
1028a37d | 372 | |
8c7dd8bc JB |
373 | if (gpio_is_valid(chip->pdata->gpio_ren[i])) { |
374 | config.ena_gpio = chip->pdata->gpio_ren[i]; | |
375 | config.ena_gpio_initialized = true; | |
376 | } else { | |
377 | config.ena_gpio = -EINVAL; | |
378 | config.ena_gpio_initialized = false; | |
379 | } | |
380 | ||
1028a37d JB |
381 | chip->rdev[i] = devm_regulator_register(chip->dev, |
382 | &da9211_regulators[i], &config); | |
383 | if (IS_ERR(chip->rdev[i])) { | |
384 | dev_err(chip->dev, | |
385 | "Failed to register DA9211 regulator\n"); | |
516c1514 | 386 | return PTR_ERR(chip->rdev[i]); |
1028a37d JB |
387 | } |
388 | ||
389 | if (chip->chip_irq != 0) { | |
390 | ret = regmap_update_bits(chip->regmap, | |
4e7089f3 | 391 | DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0); |
1028a37d JB |
392 | if (ret < 0) { |
393 | dev_err(chip->dev, | |
394 | "Failed to update mask reg: %d\n", ret); | |
516c1514 | 395 | return ret; |
1028a37d JB |
396 | } |
397 | } | |
398 | } | |
399 | ||
400 | return 0; | |
1028a37d | 401 | } |
bf3baca6 | 402 | |
1028a37d JB |
403 | /* |
404 | * I2C driver interface functions | |
405 | */ | |
406 | static int da9211_i2c_probe(struct i2c_client *i2c, | |
407 | const struct i2c_device_id *id) | |
408 | { | |
409 | struct da9211 *chip; | |
410 | int error, ret; | |
005547e0 | 411 | unsigned int data; |
1028a37d JB |
412 | |
413 | chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL); | |
1d3e6a69 AL |
414 | if (!chip) |
415 | return -ENOMEM; | |
1028a37d JB |
416 | |
417 | chip->dev = &i2c->dev; | |
418 | chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config); | |
419 | if (IS_ERR(chip->regmap)) { | |
420 | error = PTR_ERR(chip->regmap); | |
005547e0 | 421 | dev_err(chip->dev, "Failed to allocate register map: %d\n", |
1028a37d JB |
422 | error); |
423 | return error; | |
424 | } | |
425 | ||
426 | i2c_set_clientdata(i2c, chip); | |
427 | ||
428 | chip->pdata = i2c->dev.platform_data; | |
005547e0 JB |
429 | |
430 | ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data); | |
431 | if (ret < 0) { | |
432 | dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret); | |
433 | return ret; | |
434 | } | |
435 | ||
436 | switch (data) { | |
437 | case DA9211_DEVICE_ID: | |
438 | chip->chip_id = DA9211; | |
439 | break; | |
440 | case DA9213_DEVICE_ID: | |
441 | chip->chip_id = DA9213; | |
442 | break; | |
443 | default: | |
444 | dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data); | |
1028a37d JB |
445 | return -ENODEV; |
446 | } | |
447 | ||
bf3baca6 JB |
448 | if (!chip->pdata) |
449 | chip->pdata = da9211_parse_regulators_dt(chip->dev); | |
450 | ||
451 | if (IS_ERR(chip->pdata)) { | |
452 | dev_err(chip->dev, "No regulators defined for the platform\n"); | |
453 | return PTR_ERR(chip->pdata); | |
454 | } | |
455 | ||
1028a37d JB |
456 | chip->chip_irq = i2c->irq; |
457 | ||
458 | if (chip->chip_irq != 0) { | |
459 | ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL, | |
460 | da9211_irq_handler, | |
461 | IRQF_TRIGGER_LOW|IRQF_ONESHOT, | |
462 | "da9211", chip); | |
463 | if (ret != 0) { | |
464 | dev_err(chip->dev, "Failed to request IRQ: %d\n", | |
465 | chip->chip_irq); | |
466 | return ret; | |
467 | } | |
468 | } else { | |
469 | dev_warn(chip->dev, "No IRQ configured\n"); | |
470 | } | |
471 | ||
472 | ret = da9211_regulator_init(chip); | |
473 | ||
474 | if (ret < 0) | |
005547e0 | 475 | dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret); |
1028a37d JB |
476 | |
477 | return ret; | |
478 | } | |
479 | ||
1028a37d | 480 | static const struct i2c_device_id da9211_i2c_id[] = { |
6a52f563 AL |
481 | {"da9211", DA9211}, |
482 | {"da9213", DA9213}, | |
1028a37d JB |
483 | {}, |
484 | }; | |
1028a37d JB |
485 | MODULE_DEVICE_TABLE(i2c, da9211_i2c_id); |
486 | ||
6a52f563 AL |
487 | #ifdef CONFIG_OF |
488 | static const struct of_device_id da9211_dt_ids[] = { | |
489 | { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] }, | |
490 | { .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] }, | |
491 | {}, | |
492 | }; | |
493 | MODULE_DEVICE_TABLE(of, da9211_dt_ids); | |
494 | #endif | |
495 | ||
1028a37d JB |
496 | static struct i2c_driver da9211_regulator_driver = { |
497 | .driver = { | |
498 | .name = "da9211", | |
499 | .owner = THIS_MODULE, | |
6a52f563 | 500 | .of_match_table = of_match_ptr(da9211_dt_ids), |
1028a37d JB |
501 | }, |
502 | .probe = da9211_i2c_probe, | |
1028a37d JB |
503 | .id_table = da9211_i2c_id, |
504 | }; | |
505 | ||
506 | module_i2c_driver(da9211_regulator_driver); | |
507 | ||
508 | MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); | |
005547e0 | 509 | MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213"); |
1028a37d | 510 | MODULE_LICENSE("GPL v2"); |