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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 | ||
208 | /* Per-regulator power on delay from spec */ | |
209 | switch (abreg->regreg) { | |
210 | case AB3100_LDO_A: /* Fallthrough */ | |
211 | case AB3100_LDO_C: /* Fallthrough */ | |
212 | case AB3100_LDO_D: /* Fallthrough */ | |
213 | case AB3100_LDO_E: /* Fallthrough */ | |
214 | case AB3100_LDO_H: /* Fallthrough */ | |
215 | case AB3100_LDO_K: | |
216 | udelay(200); | |
217 | break; | |
218 | case AB3100_LDO_F: | |
219 | udelay(600); | |
220 | break; | |
221 | case AB3100_LDO_G: | |
222 | udelay(400); | |
223 | break; | |
224 | case AB3100_BUCK: | |
225 | mdelay(1); | |
226 | break; | |
227 | default: | |
228 | break; | |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static int ab3100_disable_regulator(struct regulator_dev *reg) | |
235 | { | |
236 | struct ab3100_regulator *abreg = reg->reg_data; | |
237 | int err; | |
238 | u8 regval; | |
239 | ||
240 | /* | |
241 | * LDO D is a special regulator. When it is disabled, the entire | |
242 | * system is shut down. So this is handled specially. | |
243 | */ | |
176f45b9 | 244 | pr_info("Called ab3100_disable_regulator\n"); |
d619bc14 | 245 | if (abreg->regreg == AB3100_LDO_D) { |
d619bc14 | 246 | dev_info(®->dev, "disabling LDO D - shut down system\n"); |
d619bc14 | 247 | /* Setting LDO D to 0x00 cuts the power to the SoC */ |
fa661258 | 248 | return abx500_set_register_interruptible(abreg->dev, 0, |
d619bc14 | 249 | AB3100_LDO_D, 0x00U); |
d619bc14 LW |
250 | } |
251 | ||
252 | /* | |
253 | * All other regulators are handled here | |
254 | */ | |
fa661258 | 255 | err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
256 | ®val); |
257 | if (err) { | |
258 | dev_err(®->dev, "unable to get register 0x%x\n", | |
259 | abreg->regreg); | |
260 | return err; | |
261 | } | |
262 | regval &= ~AB3100_REG_ON_MASK; | |
fa661258 | 263 | return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
264 | regval); |
265 | } | |
266 | ||
267 | static int ab3100_is_enabled_regulator(struct regulator_dev *reg) | |
268 | { | |
269 | struct ab3100_regulator *abreg = reg->reg_data; | |
270 | u8 regval; | |
271 | int err; | |
272 | ||
fa661258 | 273 | err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg, |
d619bc14 LW |
274 | ®val); |
275 | if (err) { | |
276 | dev_err(®->dev, "unable to get register 0x%x\n", | |
277 | abreg->regreg); | |
278 | return err; | |
279 | } | |
280 | ||
281 | return regval & AB3100_REG_ON_MASK; | |
282 | } | |
283 | ||
284 | static int ab3100_list_voltage_regulator(struct regulator_dev *reg, | |
285 | unsigned selector) | |
286 | { | |
287 | struct ab3100_regulator *abreg = reg->reg_data; | |
288 | ||
979da89a | 289 | if (selector >= abreg->voltages_len) |
d619bc14 LW |
290 | return -EINVAL; |
291 | return abreg->typ_voltages[selector]; | |
292 | } | |
293 | ||
294 | static int ab3100_get_voltage_regulator(struct regulator_dev *reg) | |
295 | { | |
296 | struct ab3100_regulator *abreg = reg->reg_data; | |
297 | u8 regval; | |
298 | int err; | |
299 | ||
300 | /* Return the voltage for fixed regulators immediately */ | |
301 | if (abreg->fixed_voltage) | |
302 | return abreg->fixed_voltage; | |
303 | ||
304 | /* | |
305 | * For variable types, read out setting and index into | |
306 | * supplied voltage list. | |
307 | */ | |
fa661258 | 308 | err = abx500_get_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
309 | abreg->regreg, ®val); |
310 | if (err) { | |
311 | dev_warn(®->dev, | |
312 | "failed to get regulator value in register %02x\n", | |
313 | abreg->regreg); | |
314 | return err; | |
315 | } | |
316 | ||
317 | /* The 3 highest bits index voltages */ | |
318 | regval &= 0xE0; | |
319 | regval >>= 5; | |
320 | ||
979da89a | 321 | if (regval >= abreg->voltages_len) { |
d619bc14 LW |
322 | dev_err(®->dev, |
323 | "regulator register %02x contains an illegal voltage setting\n", | |
324 | abreg->regreg); | |
325 | return -EINVAL; | |
326 | } | |
327 | ||
328 | return abreg->typ_voltages[regval]; | |
329 | } | |
330 | ||
331 | static int ab3100_get_best_voltage_index(struct regulator_dev *reg, | |
332 | int min_uV, int max_uV) | |
333 | { | |
334 | struct ab3100_regulator *abreg = reg->reg_data; | |
335 | int i; | |
336 | int bestmatch; | |
337 | int bestindex; | |
338 | ||
339 | /* | |
340 | * Locate the minimum voltage fitting the criteria on | |
341 | * this regulator. The switchable voltages are not | |
342 | * in strict falling order so we need to check them | |
343 | * all for the best match. | |
344 | */ | |
345 | bestmatch = INT_MAX; | |
346 | bestindex = -1; | |
347 | for (i = 0; i < abreg->voltages_len; i++) { | |
348 | if (abreg->typ_voltages[i] <= max_uV && | |
349 | abreg->typ_voltages[i] >= min_uV && | |
350 | abreg->typ_voltages[i] < bestmatch) { | |
351 | bestmatch = abreg->typ_voltages[i]; | |
352 | bestindex = i; | |
353 | } | |
354 | } | |
355 | ||
356 | if (bestindex < 0) { | |
357 | dev_warn(®->dev, "requested %d<=x<=%d uV, out of range!\n", | |
358 | min_uV, max_uV); | |
359 | return -EINVAL; | |
360 | } | |
361 | return bestindex; | |
362 | } | |
363 | ||
364 | static int ab3100_set_voltage_regulator(struct regulator_dev *reg, | |
3a93f2a9 MB |
365 | int min_uV, int max_uV, |
366 | unsigned *selector) | |
d619bc14 LW |
367 | { |
368 | struct ab3100_regulator *abreg = reg->reg_data; | |
369 | u8 regval; | |
370 | int err; | |
371 | int bestindex; | |
372 | ||
373 | bestindex = ab3100_get_best_voltage_index(reg, min_uV, max_uV); | |
374 | if (bestindex < 0) | |
375 | return bestindex; | |
376 | ||
3a93f2a9 MB |
377 | *selector = bestindex; |
378 | ||
fa661258 | 379 | err = abx500_get_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
380 | abreg->regreg, ®val); |
381 | if (err) { | |
382 | dev_warn(®->dev, | |
383 | "failed to get regulator register %02x\n", | |
384 | abreg->regreg); | |
385 | return err; | |
386 | } | |
387 | ||
388 | /* The highest three bits control the variable regulators */ | |
389 | regval &= ~0xE0; | |
390 | regval |= (bestindex << 5); | |
391 | ||
fa661258 | 392 | err = abx500_set_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
393 | abreg->regreg, regval); |
394 | if (err) | |
395 | dev_warn(®->dev, "failed to set regulator register %02x\n", | |
396 | abreg->regreg); | |
397 | ||
398 | return err; | |
399 | } | |
400 | ||
401 | static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg, | |
402 | int uV) | |
403 | { | |
404 | struct ab3100_regulator *abreg = reg->reg_data; | |
405 | u8 regval; | |
406 | int err; | |
407 | int bestindex; | |
408 | u8 targetreg; | |
409 | ||
410 | if (abreg->regreg == AB3100_LDO_E) | |
411 | targetreg = AB3100_LDO_E_SLEEP; | |
412 | else if (abreg->regreg == AB3100_BUCK) | |
413 | targetreg = AB3100_BUCK_SLEEP; | |
414 | else | |
415 | return -EINVAL; | |
416 | ||
417 | /* LDO E and BUCK have special suspend voltages you can set */ | |
418 | bestindex = ab3100_get_best_voltage_index(reg, uV, uV); | |
419 | ||
fa661258 | 420 | err = abx500_get_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
421 | targetreg, ®val); |
422 | if (err) { | |
423 | dev_warn(®->dev, | |
424 | "failed to get regulator register %02x\n", | |
425 | targetreg); | |
426 | return err; | |
427 | } | |
428 | ||
429 | /* The highest three bits control the variable regulators */ | |
430 | regval &= ~0xE0; | |
431 | regval |= (bestindex << 5); | |
432 | ||
fa661258 | 433 | err = abx500_set_register_interruptible(abreg->dev, 0, |
d619bc14 LW |
434 | targetreg, regval); |
435 | if (err) | |
436 | dev_warn(®->dev, "failed to set regulator register %02x\n", | |
437 | abreg->regreg); | |
438 | ||
439 | return err; | |
440 | } | |
441 | ||
442 | /* | |
443 | * The external regulator can just define a fixed voltage. | |
444 | */ | |
445 | static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg) | |
446 | { | |
447 | struct ab3100_regulator *abreg = reg->reg_data; | |
448 | ||
449 | return abreg->plfdata->external_voltage; | |
450 | } | |
451 | ||
452 | static struct regulator_ops regulator_ops_fixed = { | |
453 | .enable = ab3100_enable_regulator, | |
454 | .disable = ab3100_disable_regulator, | |
455 | .is_enabled = ab3100_is_enabled_regulator, | |
456 | .get_voltage = ab3100_get_voltage_regulator, | |
457 | }; | |
458 | ||
459 | static struct regulator_ops regulator_ops_variable = { | |
460 | .enable = ab3100_enable_regulator, | |
461 | .disable = ab3100_disable_regulator, | |
462 | .is_enabled = ab3100_is_enabled_regulator, | |
463 | .get_voltage = ab3100_get_voltage_regulator, | |
464 | .set_voltage = ab3100_set_voltage_regulator, | |
465 | .list_voltage = ab3100_list_voltage_regulator, | |
466 | }; | |
467 | ||
468 | static struct regulator_ops regulator_ops_variable_sleepable = { | |
469 | .enable = ab3100_enable_regulator, | |
470 | .disable = ab3100_disable_regulator, | |
471 | .is_enabled = ab3100_is_enabled_regulator, | |
472 | .get_voltage = ab3100_get_voltage_regulator, | |
473 | .set_voltage = ab3100_set_voltage_regulator, | |
474 | .set_suspend_voltage = ab3100_set_suspend_voltage_regulator, | |
475 | .list_voltage = ab3100_list_voltage_regulator, | |
476 | }; | |
477 | ||
478 | /* | |
479 | * LDO EXT is an external regulator so it is really | |
480 | * not possible to set any voltage locally here, AB3100 | |
481 | * is an on/off switch plain an simple. The external | |
482 | * voltage is defined in the board set-up if any. | |
483 | */ | |
484 | static struct regulator_ops regulator_ops_external = { | |
485 | .enable = ab3100_enable_regulator, | |
486 | .disable = ab3100_disable_regulator, | |
487 | .is_enabled = ab3100_is_enabled_regulator, | |
488 | .get_voltage = ab3100_get_voltage_regulator_external, | |
489 | }; | |
490 | ||
491 | static struct regulator_desc | |
492 | ab3100_regulator_desc[AB3100_NUM_REGULATORS] = { | |
493 | { | |
494 | .name = "LDO_A", | |
495 | .id = AB3100_LDO_A, | |
496 | .ops = ®ulator_ops_fixed, | |
497 | .type = REGULATOR_VOLTAGE, | |
64714354 | 498 | .owner = THIS_MODULE, |
d619bc14 LW |
499 | }, |
500 | { | |
501 | .name = "LDO_C", | |
502 | .id = AB3100_LDO_C, | |
503 | .ops = ®ulator_ops_fixed, | |
504 | .type = REGULATOR_VOLTAGE, | |
64714354 | 505 | .owner = THIS_MODULE, |
d619bc14 LW |
506 | }, |
507 | { | |
508 | .name = "LDO_D", | |
509 | .id = AB3100_LDO_D, | |
510 | .ops = ®ulator_ops_fixed, | |
511 | .type = REGULATOR_VOLTAGE, | |
64714354 | 512 | .owner = THIS_MODULE, |
d619bc14 LW |
513 | }, |
514 | { | |
515 | .name = "LDO_E", | |
516 | .id = AB3100_LDO_E, | |
517 | .ops = ®ulator_ops_variable_sleepable, | |
75f2ba8f | 518 | .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages), |
d619bc14 | 519 | .type = REGULATOR_VOLTAGE, |
64714354 | 520 | .owner = THIS_MODULE, |
d619bc14 LW |
521 | }, |
522 | { | |
523 | .name = "LDO_F", | |
524 | .id = AB3100_LDO_F, | |
525 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 526 | .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages), |
d619bc14 | 527 | .type = REGULATOR_VOLTAGE, |
64714354 | 528 | .owner = THIS_MODULE, |
d619bc14 LW |
529 | }, |
530 | { | |
531 | .name = "LDO_G", | |
532 | .id = AB3100_LDO_G, | |
533 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 534 | .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages), |
d619bc14 | 535 | .type = REGULATOR_VOLTAGE, |
64714354 | 536 | .owner = THIS_MODULE, |
d619bc14 LW |
537 | }, |
538 | { | |
539 | .name = "LDO_H", | |
540 | .id = AB3100_LDO_H, | |
541 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 542 | .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages), |
d619bc14 | 543 | .type = REGULATOR_VOLTAGE, |
64714354 | 544 | .owner = THIS_MODULE, |
d619bc14 LW |
545 | }, |
546 | { | |
547 | .name = "LDO_K", | |
548 | .id = AB3100_LDO_K, | |
549 | .ops = ®ulator_ops_variable, | |
75f2ba8f | 550 | .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages), |
d619bc14 | 551 | .type = REGULATOR_VOLTAGE, |
64714354 | 552 | .owner = THIS_MODULE, |
d619bc14 LW |
553 | }, |
554 | { | |
555 | .name = "LDO_EXT", | |
556 | .id = AB3100_LDO_EXT, | |
557 | .ops = ®ulator_ops_external, | |
558 | .type = REGULATOR_VOLTAGE, | |
64714354 | 559 | .owner = THIS_MODULE, |
d619bc14 LW |
560 | }, |
561 | { | |
562 | .name = "BUCK", | |
563 | .id = AB3100_BUCK, | |
564 | .ops = ®ulator_ops_variable_sleepable, | |
75f2ba8f | 565 | .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages), |
d619bc14 | 566 | .type = REGULATOR_VOLTAGE, |
64714354 | 567 | .owner = THIS_MODULE, |
d619bc14 LW |
568 | }, |
569 | }; | |
570 | ||
571 | /* | |
572 | * NOTE: the following functions are regulators pluralis - it is the | |
573 | * binding to the AB3100 core driver and the parent platform device | |
574 | * for all the different regulators. | |
575 | */ | |
576 | ||
98bf7c05 | 577 | static int __devinit ab3100_regulators_probe(struct platform_device *pdev) |
d619bc14 LW |
578 | { |
579 | struct ab3100_platform_data *plfdata = pdev->dev.platform_data; | |
d619bc14 LW |
580 | int err = 0; |
581 | u8 data; | |
582 | int i; | |
583 | ||
584 | /* Check chip state */ | |
fa661258 | 585 | err = abx500_get_register_interruptible(&pdev->dev, 0, |
d619bc14 LW |
586 | AB3100_LDO_D, &data); |
587 | if (err) { | |
588 | dev_err(&pdev->dev, "could not read initial status of LDO_D\n"); | |
589 | return err; | |
590 | } | |
591 | if (data & 0x10) | |
592 | dev_notice(&pdev->dev, | |
593 | "chip is already in active mode (Warm start)\n"); | |
594 | else | |
595 | dev_notice(&pdev->dev, | |
596 | "chip is in inactive mode (Cold start)\n"); | |
597 | ||
598 | /* Set up regulators */ | |
599 | for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) { | |
fa661258 | 600 | err = abx500_set_register_interruptible(&pdev->dev, 0, |
d619bc14 LW |
601 | ab3100_reg_init_order[i], |
602 | plfdata->reg_initvals[i]); | |
603 | if (err) { | |
604 | dev_err(&pdev->dev, "regulator initialization failed with error %d\n", | |
605 | err); | |
606 | return err; | |
607 | } | |
608 | } | |
609 | ||
d619bc14 LW |
610 | /* Register the regulators */ |
611 | for (i = 0; i < AB3100_NUM_REGULATORS; i++) { | |
612 | struct ab3100_regulator *reg = &ab3100_regulators[i]; | |
613 | struct regulator_dev *rdev; | |
614 | ||
615 | /* | |
616 | * Initialize per-regulator struct. | |
617 | * Inherit platform data, this comes down from the | |
618 | * i2c boarddata, from the machine. So if you want to | |
619 | * see what it looks like for a certain machine, go | |
620 | * into the machine I2C setup. | |
621 | */ | |
fa661258 | 622 | reg->dev = &pdev->dev; |
d619bc14 LW |
623 | reg->plfdata = plfdata; |
624 | ||
625 | /* | |
626 | * Register the regulator, pass around | |
627 | * the ab3100_regulator struct | |
628 | */ | |
629 | rdev = regulator_register(&ab3100_regulator_desc[i], | |
630 | &pdev->dev, | |
631 | &plfdata->reg_constraints[i], | |
632 | reg); | |
633 | ||
634 | if (IS_ERR(rdev)) { | |
635 | err = PTR_ERR(rdev); | |
636 | dev_err(&pdev->dev, | |
637 | "%s: failed to register regulator %s err %d\n", | |
638 | __func__, ab3100_regulator_desc[i].name, | |
639 | err); | |
d619bc14 | 640 | /* remove the already registered regulators */ |
b3fcf3e5 | 641 | while (--i >= 0) |
d619bc14 | 642 | regulator_unregister(ab3100_regulators[i].rdev); |
d619bc14 LW |
643 | return err; |
644 | } | |
645 | ||
646 | /* Then set a pointer back to the registered regulator */ | |
647 | reg->rdev = rdev; | |
648 | } | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
98bf7c05 | 653 | static int __devexit ab3100_regulators_remove(struct platform_device *pdev) |
d619bc14 LW |
654 | { |
655 | int i; | |
656 | ||
657 | for (i = 0; i < AB3100_NUM_REGULATORS; i++) { | |
658 | struct ab3100_regulator *reg = &ab3100_regulators[i]; | |
659 | ||
660 | regulator_unregister(reg->rdev); | |
661 | } | |
662 | return 0; | |
663 | } | |
664 | ||
665 | static struct platform_driver ab3100_regulators_driver = { | |
666 | .driver = { | |
667 | .name = "ab3100-regulators", | |
668 | .owner = THIS_MODULE, | |
669 | }, | |
670 | .probe = ab3100_regulators_probe, | |
98bf7c05 | 671 | .remove = __devexit_p(ab3100_regulators_remove), |
d619bc14 LW |
672 | }; |
673 | ||
674 | static __init int ab3100_regulators_init(void) | |
675 | { | |
676 | return platform_driver_register(&ab3100_regulators_driver); | |
677 | } | |
678 | ||
679 | static __exit void ab3100_regulators_exit(void) | |
680 | { | |
176f45b9 | 681 | platform_driver_unregister(&ab3100_regulators_driver); |
d619bc14 LW |
682 | } |
683 | ||
684 | subsys_initcall(ab3100_regulators_init); | |
685 | module_exit(ab3100_regulators_exit); | |
686 | ||
687 | MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>"); | |
688 | MODULE_DESCRIPTION("AB3100 Regulator driver"); | |
689 | MODULE_LICENSE("GPL"); | |
690 | MODULE_ALIAS("platform:ab3100-regulators"); |