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d619bc14 LW |
1 | /* |
2 | * drivers/regulator/ab3100.c | |
3 | * | |
4 | * Copyright (C) 2008-2009 ST-Ericsson AB | |
5 | * License terms: GNU General Public License (GPL) version 2 | |
6 | * Low-level control of the AB3100 IC Low Dropout (LDO) | |
7 | * regulators, external regulator and buck converter | |
8 | * Author: Mattias Wallin <mattias.wallin@stericsson.com> | |
9 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/regulator/driver.h> | |
812f9e9d | 19 | #include <linux/mfd/abx500.h> |
d619bc14 LW |
20 | |
21 | /* LDO registers and some handy masking definitions for AB3100 */ | |
22 | #define AB3100_LDO_A 0x40 | |
23 | #define AB3100_LDO_C 0x41 | |
24 | #define AB3100_LDO_D 0x42 | |
25 | #define AB3100_LDO_E 0x43 | |
26 | #define AB3100_LDO_E_SLEEP 0x44 | |
27 | #define AB3100_LDO_F 0x45 | |
28 | #define AB3100_LDO_G 0x46 | |
29 | #define AB3100_LDO_H 0x47 | |
30 | #define AB3100_LDO_H_SLEEP_MODE 0 | |
31 | #define AB3100_LDO_H_SLEEP_EN 2 | |
32 | #define AB3100_LDO_ON 4 | |
33 | #define AB3100_LDO_H_VSEL_AC 5 | |
34 | #define AB3100_LDO_K 0x48 | |
35 | #define AB3100_LDO_EXT 0x49 | |
36 | #define AB3100_BUCK 0x4A | |
37 | #define AB3100_BUCK_SLEEP 0x4B | |
38 | #define AB3100_REG_ON_MASK 0x10 | |
39 | ||
40 | /** | |
41 | * struct ab3100_regulator | |
42 | * A struct passed around the individual regulator functions | |
43 | * @platform_device: platform device holding this regulator | |
fa661258 | 44 | * @dev: handle to the device |
d619bc14 LW |
45 | * @plfdata: AB3100 platform data passed in at probe time |
46 | * @regreg: regulator register number in the AB3100 | |
47 | * @fixed_voltage: a fixed voltage for this regulator, if this | |
48 | * 0 the voltages array is used instead. | |
49 | * @typ_voltages: an array of available typical voltages for | |
50 | * this regulator | |
51 | * @voltages_len: length of the array of available voltages | |
52 | */ | |
53 | struct ab3100_regulator { | |
54 | struct regulator_dev *rdev; | |
fa661258 | 55 | struct device *dev; |
d619bc14 LW |
56 | struct ab3100_platform_data *plfdata; |
57 | u8 regreg; | |
58 | int fixed_voltage; | |
59 | int const *typ_voltages; | |
60 | u8 voltages_len; | |
61 | }; | |
62 | ||
63 | /* The order in which registers are initialized */ | |
64 | static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = { | |
65 | AB3100_LDO_A, | |
66 | AB3100_LDO_C, | |
67 | AB3100_LDO_E, | |
68 | AB3100_LDO_E_SLEEP, | |
69 | AB3100_LDO_F, | |
70 | AB3100_LDO_G, | |
71 | AB3100_LDO_H, | |
72 | AB3100_LDO_K, | |
73 | AB3100_LDO_EXT, | |
74 | AB3100_BUCK, | |
75 | AB3100_BUCK_SLEEP, | |
76 | AB3100_LDO_D, | |
77 | }; | |
78 | ||
79 | /* Preset (hardware defined) voltages for these regulators */ | |
80 | #define LDO_A_VOLTAGE 2750000 | |
81 | #define LDO_C_VOLTAGE 2650000 | |
82 | #define LDO_D_VOLTAGE 2650000 | |
83 | ||
9992ef40 | 84 | static const int ldo_e_buck_typ_voltages[] = { |
d619bc14 LW |
85 | 1800000, |
86 | 1400000, | |
87 | 1300000, | |
88 | 1200000, | |
89 | 1100000, | |
90 | 1050000, | |
91 | 900000, | |
92 | }; | |
93 | ||
9992ef40 | 94 | static const int ldo_f_typ_voltages[] = { |
d619bc14 LW |
95 | 1800000, |
96 | 1400000, | |
97 | 1300000, | |
98 | 1200000, | |
99 | 1100000, | |
100 | 1050000, | |
101 | 2500000, | |
102 | 2650000, | |
103 | }; | |
104 | ||
9992ef40 | 105 | static const int ldo_g_typ_voltages[] = { |
d619bc14 LW |
106 | 2850000, |
107 | 2750000, | |
108 | 1800000, | |
109 | 1500000, | |
110 | }; | |
111 | ||
9992ef40 | 112 | static const int ldo_h_typ_voltages[] = { |
d619bc14 LW |
113 | 2750000, |
114 | 1800000, | |
115 | 1500000, | |
116 | 1200000, | |
117 | }; | |
118 | ||
9992ef40 | 119 | static const int ldo_k_typ_voltages[] = { |
d619bc14 LW |
120 | 2750000, |
121 | 1800000, | |
122 | }; | |
123 | ||
124 | ||
125 | /* The regulator devices */ | |
126 | static struct ab3100_regulator | |
127 | ab3100_regulators[AB3100_NUM_REGULATORS] = { | |
128 | { | |
129 | .regreg = AB3100_LDO_A, | |
130 | .fixed_voltage = LDO_A_VOLTAGE, | |
131 | }, | |
132 | { | |
133 | .regreg = AB3100_LDO_C, | |
134 | .fixed_voltage = LDO_C_VOLTAGE, | |
135 | }, | |
136 | { | |
137 | .regreg = AB3100_LDO_D, | |
138 | .fixed_voltage = LDO_D_VOLTAGE, | |
139 | }, | |
140 | { | |
141 | .regreg = AB3100_LDO_E, | |
142 | .typ_voltages = ldo_e_buck_typ_voltages, | |
143 | .voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages), | |
144 | }, | |
145 | { | |
146 | .regreg = AB3100_LDO_F, | |
147 | .typ_voltages = ldo_f_typ_voltages, | |
148 | .voltages_len = ARRAY_SIZE(ldo_f_typ_voltages), | |
149 | }, | |
150 | { | |
151 | .regreg = AB3100_LDO_G, | |
152 | .typ_voltages = ldo_g_typ_voltages, | |
153 | .voltages_len = ARRAY_SIZE(ldo_g_typ_voltages), | |
154 | }, | |
155 | { | |
156 | .regreg = AB3100_LDO_H, | |
157 | .typ_voltages = ldo_h_typ_voltages, | |
158 | .voltages_len = ARRAY_SIZE(ldo_h_typ_voltages), | |
159 | }, | |
160 | { | |
161 | .regreg = AB3100_LDO_K, | |
162 | .typ_voltages = ldo_k_typ_voltages, | |
163 | .voltages_len = ARRAY_SIZE(ldo_k_typ_voltages), | |
164 | }, | |
165 | { | |
166 | .regreg = AB3100_LDO_EXT, | |
167 | /* No voltages for the external regulator */ | |
168 | }, | |
169 | { | |
170 | .regreg = AB3100_BUCK, | |
171 | .typ_voltages = ldo_e_buck_typ_voltages, | |
172 | .voltages_len = ARRAY_SIZE(ldo_e_buck_typ_voltages), | |
173 | }, | |
174 | }; | |
175 | ||
176 | /* | |
177 | * General functions for enable, disable and is_enabled used for | |
178 | * LDO: A,C,E,F,G,H,K,EXT and BUCK | |
179 | */ | |
180 | static int ab3100_enable_regulator(struct regulator_dev *reg) | |
181 | { | |
182 | struct ab3100_regulator *abreg = reg->reg_data; | |
183 | int err; | |
184 | u8 regval; | |
185 | ||
fa661258 | 186 | err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
187 | ®val); |
188 | if (err) { | |
189 | dev_warn(®->dev, "failed to get regid %d value\n", | |
190 | abreg->regreg); | |
191 | return err; | |
192 | } | |
193 | ||
194 | /* The regulator is already on, no reason to go further */ | |
195 | if (regval & AB3100_REG_ON_MASK) | |
196 | return 0; | |
197 | ||
198 | regval |= AB3100_REG_ON_MASK; | |
199 | ||
fa661258 | 200 | err = abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
201 | regval); |
202 | if (err) { | |
203 | dev_warn(®->dev, "failed to set regid %d value\n", | |
204 | abreg->regreg); | |
205 | return err; | |
206 | } | |
207 | ||
d619bc14 LW |
208 | return 0; |
209 | } | |
210 | ||
211 | static int ab3100_disable_regulator(struct regulator_dev *reg) | |
212 | { | |
213 | struct ab3100_regulator *abreg = reg->reg_data; | |
214 | int err; | |
215 | u8 regval; | |
216 | ||
217 | /* | |
218 | * LDO D is a special regulator. When it is disabled, the entire | |
219 | * system is shut down. So this is handled specially. | |
220 | */ | |
176f45b9 | 221 | pr_info("Called ab3100_disable_regulator\n"); |
d619bc14 | 222 | if (abreg->regreg == AB3100_LDO_D) { |
d619bc14 | 223 | dev_info(®->dev, "disabling LDO D - shut down system\n"); |
d619bc14 | 224 | /* Setting LDO D to 0x00 cuts the power to the SoC */ |
fa661258 | 225 | return abx500_set_register_interruptible(abreg->dev, 0, |
d619bc14 | 226 | AB3100_LDO_D, 0x00U); |
d619bc14 LW |
227 | } |
228 | ||
229 | /* | |
230 | * All other regulators are handled here | |
231 | */ | |
fa661258 | 232 | err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
233 | ®val); |
234 | if (err) { | |
235 | dev_err(®->dev, "unable to get register 0x%x\n", | |
236 | abreg->regreg); | |
237 | return err; | |
238 | } | |
239 | regval &= ~AB3100_REG_ON_MASK; | |
fa661258 | 240 | return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
241 | regval); |
242 | } | |
243 | ||
244 | static int ab3100_is_enabled_regulator(struct regulator_dev *reg) | |
245 | { | |
246 | struct ab3100_regulator *abreg = reg->reg_data; | |
247 | u8 regval; | |
248 | int err; | |
249 | ||
fa661258 | 250 | err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
251 | ®val); |
252 | if (err) { | |
253 | dev_err(®->dev, "unable to get register 0x%x\n", | |
254 | abreg->regreg); | |
255 | return err; | |
256 | } | |
257 | ||
258 | return regval & AB3100_REG_ON_MASK; | |
259 | } | |
260 | ||
261 | static int ab3100_list_voltage_regulator(struct regulator_dev *reg, | |
262 | unsigned selector) | |
263 | { | |
264 | struct ab3100_regulator *abreg = reg->reg_data; | |
265 | ||
979da89a | 266 | if (selector >= abreg->voltages_len) |
d619bc14 LW |
267 | return -EINVAL; |
268 | return abreg->typ_voltages[selector]; | |
269 | } | |
270 | ||
271 | static int ab3100_get_voltage_regulator(struct regulator_dev *reg) | |
272 | { | |
273 | struct ab3100_regulator *abreg = reg->reg_data; | |
274 | u8 regval; | |
275 | int err; | |
276 | ||
277 | /* Return the voltage for fixed regulators immediately */ | |
278 | if (abreg->fixed_voltage) | |
279 | return abreg->fixed_voltage; | |
280 | ||
281 | /* | |
282 | * For variable types, read out setting and index into | |
283 | * supplied voltage list. | |
284 | */ | |
fa661258 | 285 | err = abx500_get_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
286 | abreg->regreg, ®val); |
287 | if (err) { | |
288 | dev_warn(®->dev, | |
289 | "failed to get regulator value in register %02x\n", | |
290 | abreg->regreg); | |
291 | return err; | |
292 | } | |
293 | ||
294 | /* The 3 highest bits index voltages */ | |
295 | regval &= 0xE0; | |
296 | regval >>= 5; | |
297 | ||
979da89a | 298 | if (regval >= abreg->voltages_len) { |
d619bc14 LW |
299 | dev_err(®->dev, |
300 | "regulator register %02x contains an illegal voltage setting\n", | |
301 | abreg->regreg); | |
302 | return -EINVAL; | |
303 | } | |
304 | ||
305 | return abreg->typ_voltages[regval]; | |
306 | } | |
307 | ||
308 | static int ab3100_get_best_voltage_index(struct regulator_dev *reg, | |
309 | int min_uV, int max_uV) | |
310 | { | |
311 | struct ab3100_regulator *abreg = reg->reg_data; | |
312 | int i; | |
313 | int bestmatch; | |
314 | int bestindex; | |
315 | ||
316 | /* | |
317 | * Locate the minimum voltage fitting the criteria on | |
318 | * this regulator. The switchable voltages are not | |
319 | * in strict falling order so we need to check them | |
320 | * all for the best match. | |
321 | */ | |
322 | bestmatch = INT_MAX; | |
323 | bestindex = -1; | |
324 | for (i = 0; i < abreg->voltages_len; i++) { | |
325 | if (abreg->typ_voltages[i] <= max_uV && | |
326 | abreg->typ_voltages[i] >= min_uV && | |
327 | abreg->typ_voltages[i] < bestmatch) { | |
328 | bestmatch = abreg->typ_voltages[i]; | |
329 | bestindex = i; | |
330 | } | |
331 | } | |
332 | ||
333 | if (bestindex < 0) { | |
334 | dev_warn(®->dev, "requested %d<=x<=%d uV, out of range!\n", | |
335 | min_uV, max_uV); | |
336 | return -EINVAL; | |
337 | } | |
338 | return bestindex; | |
339 | } | |
340 | ||
341 | static int ab3100_set_voltage_regulator(struct regulator_dev *reg, | |
3a93f2a9 MB |
342 | int min_uV, int max_uV, |
343 | unsigned *selector) | |
d619bc14 LW |
344 | { |
345 | struct ab3100_regulator *abreg = reg->reg_data; | |
346 | u8 regval; | |
347 | int err; | |
348 | int bestindex; | |
349 | ||
350 | bestindex = ab3100_get_best_voltage_index(reg, min_uV, max_uV); | |
351 | if (bestindex < 0) | |
352 | return bestindex; | |
353 | ||
3a93f2a9 MB |
354 | *selector = bestindex; |
355 | ||
fa661258 | 356 | err = abx500_get_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
357 | abreg->regreg, ®val); |
358 | if (err) { | |
359 | dev_warn(®->dev, | |
360 | "failed to get regulator register %02x\n", | |
361 | abreg->regreg); | |
362 | return err; | |
363 | } | |
364 | ||
365 | /* The highest three bits control the variable regulators */ | |
366 | regval &= ~0xE0; | |
367 | regval |= (bestindex << 5); | |
368 | ||
fa661258 | 369 | err = abx500_set_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
370 | abreg->regreg, regval); |
371 | if (err) | |
372 | dev_warn(®->dev, "failed to set regulator register %02x\n", | |
373 | abreg->regreg); | |
374 | ||
375 | return err; | |
376 | } | |
377 | ||
378 | static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg, | |
379 | int uV) | |
380 | { | |
381 | struct ab3100_regulator *abreg = reg->reg_data; | |
382 | u8 regval; | |
383 | int err; | |
384 | int bestindex; | |
385 | u8 targetreg; | |
386 | ||
387 | if (abreg->regreg == AB3100_LDO_E) | |
388 | targetreg = AB3100_LDO_E_SLEEP; | |
389 | else if (abreg->regreg == AB3100_BUCK) | |
390 | targetreg = AB3100_BUCK_SLEEP; | |
391 | else | |
392 | return -EINVAL; | |
393 | ||
394 | /* LDO E and BUCK have special suspend voltages you can set */ | |
395 | bestindex = ab3100_get_best_voltage_index(reg, uV, uV); | |
396 | ||
fa661258 | 397 | err = abx500_get_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
398 | targetreg, ®val); |
399 | if (err) { | |
400 | dev_warn(®->dev, | |
401 | "failed to get regulator register %02x\n", | |
402 | targetreg); | |
403 | return err; | |
404 | } | |
405 | ||
406 | /* The highest three bits control the variable regulators */ | |
407 | regval &= ~0xE0; | |
408 | regval |= (bestindex << 5); | |
409 | ||
fa661258 | 410 | err = abx500_set_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
411 | targetreg, regval); |
412 | if (err) | |
413 | dev_warn(®->dev, "failed to set regulator register %02x\n", | |
414 | abreg->regreg); | |
415 | ||
416 | return err; | |
417 | } | |
418 | ||
419 | /* | |
420 | * The external regulator can just define a fixed voltage. | |
421 | */ | |
422 | static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg) | |
423 | { | |
424 | struct ab3100_regulator *abreg = reg->reg_data; | |
425 | ||
426 | return abreg->plfdata->external_voltage; | |
427 | } | |
428 | ||
19c98825 LW |
429 | static int ab3100_enable_time_regulator(struct regulator_dev *reg) |
430 | { | |
431 | struct ab3100_regulator *abreg = reg->reg_data; | |
432 | ||
433 | /* Per-regulator power on delay from spec */ | |
434 | switch (abreg->regreg) { | |
435 | case AB3100_LDO_A: /* Fallthrough */ | |
436 | case AB3100_LDO_C: /* Fallthrough */ | |
437 | case AB3100_LDO_D: /* Fallthrough */ | |
438 | case AB3100_LDO_E: /* Fallthrough */ | |
439 | case AB3100_LDO_H: /* Fallthrough */ | |
440 | case AB3100_LDO_K: | |
441 | return 200; | |
442 | case AB3100_LDO_F: | |
443 | return 600; | |
444 | case AB3100_LDO_G: | |
445 | return 400; | |
446 | case AB3100_BUCK: | |
447 | return 1000; | |
448 | default: | |
449 | break; | |
450 | } | |
451 | return 0; | |
452 | } | |
453 | ||
d619bc14 LW |
454 | static struct regulator_ops regulator_ops_fixed = { |
455 | .enable = ab3100_enable_regulator, | |
456 | .disable = ab3100_disable_regulator, | |
457 | .is_enabled = ab3100_is_enabled_regulator, | |
458 | .get_voltage = ab3100_get_voltage_regulator, | |
19c98825 | 459 | .enable_time = ab3100_enable_time_regulator, |
d619bc14 LW |
460 | }; |
461 | ||
462 | static struct regulator_ops regulator_ops_variable = { | |
463 | .enable = ab3100_enable_regulator, | |
464 | .disable = ab3100_disable_regulator, | |
465 | .is_enabled = ab3100_is_enabled_regulator, | |
466 | .get_voltage = ab3100_get_voltage_regulator, | |
467 | .set_voltage = ab3100_set_voltage_regulator, | |
468 | .list_voltage = ab3100_list_voltage_regulator, | |
19c98825 | 469 | .enable_time = ab3100_enable_time_regulator, |
d619bc14 LW |
470 | }; |
471 | ||
472 | static struct regulator_ops regulator_ops_variable_sleepable = { | |
473 | .enable = ab3100_enable_regulator, | |
474 | .disable = ab3100_disable_regulator, | |
475 | .is_enabled = ab3100_is_enabled_regulator, | |
476 | .get_voltage = ab3100_get_voltage_regulator, | |
477 | .set_voltage = ab3100_set_voltage_regulator, | |
478 | .set_suspend_voltage = ab3100_set_suspend_voltage_regulator, | |
479 | .list_voltage = ab3100_list_voltage_regulator, | |
19c98825 | 480 | .enable_time = ab3100_enable_time_regulator, |
d619bc14 LW |
481 | }; |
482 | ||
483 | /* | |
484 | * LDO EXT is an external regulator so it is really | |
485 | * not possible to set any voltage locally here, AB3100 | |
486 | * is an on/off switch plain an simple. The external | |
487 | * voltage is defined in the board set-up if any. | |
488 | */ | |
489 | static struct regulator_ops regulator_ops_external = { | |
490 | .enable = ab3100_enable_regulator, | |
491 | .disable = ab3100_disable_regulator, | |
492 | .is_enabled = ab3100_is_enabled_regulator, | |
493 | .get_voltage = ab3100_get_voltage_regulator_external, | |
494 | }; | |
495 | ||
496 | static struct regulator_desc | |
497 | ab3100_regulator_desc[AB3100_NUM_REGULATORS] = { | |
498 | { | |
499 | .name = "LDO_A", | |
500 | .id = AB3100_LDO_A, | |
501 | .ops = ®ulator_ops_fixed, | |
502 | .type = REGULATOR_VOLTAGE, | |
64714354 | 503 | .owner = THIS_MODULE, |
d619bc14 LW |
504 | }, |
505 | { | |
506 | .name = "LDO_C", | |
507 | .id = AB3100_LDO_C, | |
508 | .ops = ®ulator_ops_fixed, | |
509 | .type = REGULATOR_VOLTAGE, | |
64714354 | 510 | .owner = THIS_MODULE, |
d619bc14 LW |
511 | }, |
512 | { | |
513 | .name = "LDO_D", | |
514 | .id = AB3100_LDO_D, | |
515 | .ops = ®ulator_ops_fixed, | |
516 | .type = REGULATOR_VOLTAGE, | |
64714354 | 517 | .owner = THIS_MODULE, |
d619bc14 LW |
518 | }, |
519 | { | |
520 | .name = "LDO_E", | |
521 | .id = AB3100_LDO_E, | |
522 | .ops = ®ulator_ops_variable_sleepable, | |
75f2ba8f | 523 | .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages), |
d619bc14 | 524 | .type = REGULATOR_VOLTAGE, |
64714354 | 525 | .owner = THIS_MODULE, |
d619bc14 LW |
526 | }, |
527 | { | |
528 | .name = "LDO_F", | |
529 | .id = AB3100_LDO_F, | |
530 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 531 | .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages), |
d619bc14 | 532 | .type = REGULATOR_VOLTAGE, |
64714354 | 533 | .owner = THIS_MODULE, |
d619bc14 LW |
534 | }, |
535 | { | |
536 | .name = "LDO_G", | |
537 | .id = AB3100_LDO_G, | |
538 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 539 | .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages), |
d619bc14 | 540 | .type = REGULATOR_VOLTAGE, |
64714354 | 541 | .owner = THIS_MODULE, |
d619bc14 LW |
542 | }, |
543 | { | |
544 | .name = "LDO_H", | |
545 | .id = AB3100_LDO_H, | |
546 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 547 | .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages), |
d619bc14 | 548 | .type = REGULATOR_VOLTAGE, |
64714354 | 549 | .owner = THIS_MODULE, |
d619bc14 LW |
550 | }, |
551 | { | |
552 | .name = "LDO_K", | |
553 | .id = AB3100_LDO_K, | |
554 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 555 | .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages), |
d619bc14 | 556 | .type = REGULATOR_VOLTAGE, |
64714354 | 557 | .owner = THIS_MODULE, |
d619bc14 LW |
558 | }, |
559 | { | |
560 | .name = "LDO_EXT", | |
561 | .id = AB3100_LDO_EXT, | |
562 | .ops = ®ulator_ops_external, | |
563 | .type = REGULATOR_VOLTAGE, | |
64714354 | 564 | .owner = THIS_MODULE, |
d619bc14 LW |
565 | }, |
566 | { | |
567 | .name = "BUCK", | |
568 | .id = AB3100_BUCK, | |
569 | .ops = ®ulator_ops_variable_sleepable, | |
75f2ba8f | 570 | .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages), |
d619bc14 | 571 | .type = REGULATOR_VOLTAGE, |
64714354 | 572 | .owner = THIS_MODULE, |
d619bc14 LW |
573 | }, |
574 | }; | |
575 | ||
576 | /* | |
577 | * NOTE: the following functions are regulators pluralis - it is the | |
578 | * binding to the AB3100 core driver and the parent platform device | |
579 | * for all the different regulators. | |
580 | */ | |
581 | ||
98bf7c05 | 582 | static int __devinit ab3100_regulators_probe(struct platform_device *pdev) |
d619bc14 | 583 | { |
a771e36e | 584 | struct ab3100_platform_data *plfdata = pdev->dev.platform_data; |
d619bc14 LW |
585 | int err = 0; |
586 | u8 data; | |
587 | int i; | |
588 | ||
589 | /* Check chip state */ | |
fa661258 | 590 | err = abx500_get_register_interruptible(&pdev->dev, 0, |
d619bc14 LW |
591 | AB3100_LDO_D, &data); |
592 | if (err) { | |
593 | dev_err(&pdev->dev, "could not read initial status of LDO_D\n"); | |
594 | return err; | |
595 | } | |
596 | if (data & 0x10) | |
597 | dev_notice(&pdev->dev, | |
598 | "chip is already in active mode (Warm start)\n"); | |
599 | else | |
600 | dev_notice(&pdev->dev, | |
601 | "chip is in inactive mode (Cold start)\n"); | |
602 | ||
603 | /* Set up regulators */ | |
604 | for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) { | |
fa661258 | 605 | err = abx500_set_register_interruptible(&pdev->dev, 0, |
d619bc14 LW |
606 | ab3100_reg_init_order[i], |
607 | plfdata->reg_initvals[i]); | |
608 | if (err) { | |
609 | dev_err(&pdev->dev, "regulator initialization failed with error %d\n", | |
610 | err); | |
611 | return err; | |
612 | } | |
613 | } | |
614 | ||
d619bc14 LW |
615 | /* Register the regulators */ |
616 | for (i = 0; i < AB3100_NUM_REGULATORS; i++) { | |
617 | struct ab3100_regulator *reg = &ab3100_regulators[i]; | |
618 | struct regulator_dev *rdev; | |
619 | ||
620 | /* | |
621 | * Initialize per-regulator struct. | |
622 | * Inherit platform data, this comes down from the | |
623 | * i2c boarddata, from the machine. So if you want to | |
624 | * see what it looks like for a certain machine, go | |
625 | * into the machine I2C setup. | |
626 | */ | |
fa661258 | 627 | reg->dev = &pdev->dev; |
d619bc14 LW |
628 | reg->plfdata = plfdata; |
629 | ||
630 | /* | |
631 | * Register the regulator, pass around | |
632 | * the ab3100_regulator struct | |
633 | */ | |
634 | rdev = regulator_register(&ab3100_regulator_desc[i], | |
635 | &pdev->dev, | |
636 | &plfdata->reg_constraints[i], | |
2c043bcb | 637 | reg, NULL); |
d619bc14 LW |
638 | |
639 | if (IS_ERR(rdev)) { | |
640 | err = PTR_ERR(rdev); | |
641 | dev_err(&pdev->dev, | |
642 | "%s: failed to register regulator %s err %d\n", | |
643 | __func__, ab3100_regulator_desc[i].name, | |
644 | err); | |
d619bc14 | 645 | /* remove the already registered regulators */ |
b3fcf3e5 | 646 | while (--i >= 0) |
d619bc14 | 647 | regulator_unregister(ab3100_regulators[i].rdev); |
d619bc14 LW |
648 | return err; |
649 | } | |
650 | ||
651 | /* Then set a pointer back to the registered regulator */ | |
652 | reg->rdev = rdev; | |
653 | } | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
98bf7c05 | 658 | static int __devexit ab3100_regulators_remove(struct platform_device *pdev) |
d619bc14 LW |
659 | { |
660 | int i; | |
661 | ||
662 | for (i = 0; i < AB3100_NUM_REGULATORS; i++) { | |
663 | struct ab3100_regulator *reg = &ab3100_regulators[i]; | |
664 | ||
665 | regulator_unregister(reg->rdev); | |
666 | } | |
667 | return 0; | |
668 | } | |
669 | ||
670 | static struct platform_driver ab3100_regulators_driver = { | |
671 | .driver = { | |
672 | .name = "ab3100-regulators", | |
673 | .owner = THIS_MODULE, | |
674 | }, | |
675 | .probe = ab3100_regulators_probe, | |
98bf7c05 | 676 | .remove = __devexit_p(ab3100_regulators_remove), |
d619bc14 LW |
677 | }; |
678 | ||
679 | static __init int ab3100_regulators_init(void) | |
680 | { | |
681 | return platform_driver_register(&ab3100_regulators_driver); | |
682 | } | |
683 | ||
684 | static __exit void ab3100_regulators_exit(void) | |
685 | { | |
176f45b9 | 686 | platform_driver_unregister(&ab3100_regulators_driver); |
d619bc14 LW |
687 | } |
688 | ||
689 | subsys_initcall(ab3100_regulators_init); | |
690 | module_exit(ab3100_regulators_exit); | |
691 | ||
692 | MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>"); | |
693 | MODULE_DESCRIPTION("AB3100 Regulator driver"); | |
694 | MODULE_LICENSE("GPL"); | |
695 | MODULE_ALIAS("platform:ab3100-regulators"); |