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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> |
19 | #include <linux/mfd/ab3100.h> |
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 |
44 | * @ab3100: handle to the AB3100 parent chip |
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; |
55 | struct ab3100 *ab3100; |
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 | |
84 | static const int ldo_e_buck_typ_voltages[] = { |
85 | 1800000, |
86 | 1400000, |
87 | 1300000, |
88 | 1200000, |
89 | 1100000, |
90 | 1050000, |
91 | 900000, |
92 | }; |
93 | |
94 | static const int ldo_f_typ_voltages[] = { |
95 | 1800000, |
96 | 1400000, |
97 | 1300000, |
98 | 1200000, |
99 | 1100000, |
100 | 1050000, |
101 | 2500000, |
102 | 2650000, |
103 | }; |
104 | |
105 | static const int ldo_g_typ_voltages[] = { |
106 | 2850000, |
107 | 2750000, |
108 | 1800000, |
109 | 1500000, |
110 | }; |
111 | |
112 | static const int ldo_h_typ_voltages[] = { |
113 | 2750000, |
114 | 1800000, |
115 | 1500000, |
116 | 1200000, |
117 | }; |
118 | |
119 | static const int ldo_k_typ_voltages[] = { |
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 | |
186 | err = ab3100_get_register_interruptible(abreg->ab3100, abreg->regreg, |
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 | |
200 | err = ab3100_set_register_interruptible(abreg->ab3100, abreg->regreg, |
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 | */ |
244 | pr_info("Called ab3100_disable_regulator\n"); |
245 | if (abreg->regreg == AB3100_LDO_D) { |
246 | dev_info(®->dev, "disabling LDO D - shut down system\n"); |
247 | /* Setting LDO D to 0x00 cuts the power to the SoC */ |
248 | return ab3100_set_register_interruptible(abreg->ab3100, |
249 | AB3100_LDO_D, 0x00U); |
250 | } |
251 | |
252 | /* |
253 | * All other regulators are handled here |
254 | */ |
255 | err = ab3100_get_register_interruptible(abreg->ab3100, abreg->regreg, |
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; |
263 | return ab3100_set_register_interruptible(abreg->ab3100, abreg->regreg, |
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 | |
273 | err = ab3100_get_register_interruptible(abreg->ab3100, abreg->regreg, |
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 | |
289 | if (selector > abreg->voltages_len) |
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 | */ |
308 | err = ab3100_get_register_interruptible(abreg->ab3100, |
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 | |
321 | if (regval > abreg->voltages_len) { |
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, |
365 | int min_uV, int max_uV) |
366 | { |
367 | struct ab3100_regulator *abreg = reg->reg_data; |
368 | u8 regval; |
369 | int err; |
370 | int bestindex; |
371 | |
372 | bestindex = ab3100_get_best_voltage_index(reg, min_uV, max_uV); |
373 | if (bestindex < 0) |
374 | return bestindex; |
375 | |
376 | err = ab3100_get_register_interruptible(abreg->ab3100, |
377 | abreg->regreg, ®val); |
378 | if (err) { |
379 | dev_warn(®->dev, |
380 | "failed to get regulator register %02x\n", |
381 | abreg->regreg); |
382 | return err; |
383 | } |
384 | |
385 | /* The highest three bits control the variable regulators */ |
386 | regval &= ~0xE0; |
387 | regval |= (bestindex << 5); |
388 | |
389 | err = ab3100_set_register_interruptible(abreg->ab3100, |
390 | abreg->regreg, regval); |
391 | if (err) |
392 | dev_warn(®->dev, "failed to set regulator register %02x\n", |
393 | abreg->regreg); |
394 | |
395 | return err; |
396 | } |
397 | |
398 | static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg, |
399 | int uV) |
400 | { |
401 | struct ab3100_regulator *abreg = reg->reg_data; |
402 | u8 regval; |
403 | int err; |
404 | int bestindex; |
405 | u8 targetreg; |
406 | |
407 | if (abreg->regreg == AB3100_LDO_E) |
408 | targetreg = AB3100_LDO_E_SLEEP; |
409 | else if (abreg->regreg == AB3100_BUCK) |
410 | targetreg = AB3100_BUCK_SLEEP; |
411 | else |
412 | return -EINVAL; |
413 | |
414 | /* LDO E and BUCK have special suspend voltages you can set */ |
415 | bestindex = ab3100_get_best_voltage_index(reg, uV, uV); |
416 | |
417 | err = ab3100_get_register_interruptible(abreg->ab3100, |
418 | targetreg, ®val); |
419 | if (err) { |
420 | dev_warn(®->dev, |
421 | "failed to get regulator register %02x\n", |
422 | targetreg); |
423 | return err; |
424 | } |
425 | |
426 | /* The highest three bits control the variable regulators */ |
427 | regval &= ~0xE0; |
428 | regval |= (bestindex << 5); |
429 | |
430 | err = ab3100_set_register_interruptible(abreg->ab3100, |
431 | targetreg, regval); |
432 | if (err) |
433 | dev_warn(®->dev, "failed to set regulator register %02x\n", |
434 | abreg->regreg); |
435 | |
436 | return err; |
437 | } |
438 | |
439 | /* |
440 | * The external regulator can just define a fixed voltage. |
441 | */ |
442 | static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg) |
443 | { |
444 | struct ab3100_regulator *abreg = reg->reg_data; |
445 | |
446 | return abreg->plfdata->external_voltage; |
447 | } |
448 | |
449 | static struct regulator_ops regulator_ops_fixed = { |
450 | .enable = ab3100_enable_regulator, |
451 | .disable = ab3100_disable_regulator, |
452 | .is_enabled = ab3100_is_enabled_regulator, |
453 | .get_voltage = ab3100_get_voltage_regulator, |
454 | }; |
455 | |
456 | static struct regulator_ops regulator_ops_variable = { |
457 | .enable = ab3100_enable_regulator, |
458 | .disable = ab3100_disable_regulator, |
459 | .is_enabled = ab3100_is_enabled_regulator, |
460 | .get_voltage = ab3100_get_voltage_regulator, |
461 | .set_voltage = ab3100_set_voltage_regulator, |
462 | .list_voltage = ab3100_list_voltage_regulator, |
463 | }; |
464 | |
465 | static struct regulator_ops regulator_ops_variable_sleepable = { |
466 | .enable = ab3100_enable_regulator, |
467 | .disable = ab3100_disable_regulator, |
468 | .is_enabled = ab3100_is_enabled_regulator, |
469 | .get_voltage = ab3100_get_voltage_regulator, |
470 | .set_voltage = ab3100_set_voltage_regulator, |
471 | .set_suspend_voltage = ab3100_set_suspend_voltage_regulator, |
472 | .list_voltage = ab3100_list_voltage_regulator, |
473 | }; |
474 | |
475 | /* |
476 | * LDO EXT is an external regulator so it is really |
477 | * not possible to set any voltage locally here, AB3100 |
478 | * is an on/off switch plain an simple. The external |
479 | * voltage is defined in the board set-up if any. |
480 | */ |
481 | static struct regulator_ops regulator_ops_external = { |
482 | .enable = ab3100_enable_regulator, |
483 | .disable = ab3100_disable_regulator, |
484 | .is_enabled = ab3100_is_enabled_regulator, |
485 | .get_voltage = ab3100_get_voltage_regulator_external, |
486 | }; |
487 | |
488 | static struct regulator_desc |
489 | ab3100_regulator_desc[AB3100_NUM_REGULATORS] = { |
490 | { |
491 | .name = "LDO_A", |
492 | .id = AB3100_LDO_A, |
493 | .ops = ®ulator_ops_fixed, |
494 | .type = REGULATOR_VOLTAGE, |
495 | }, |
496 | { |
497 | .name = "LDO_C", |
498 | .id = AB3100_LDO_C, |
499 | .ops = ®ulator_ops_fixed, |
500 | .type = REGULATOR_VOLTAGE, |
501 | }, |
502 | { |
503 | .name = "LDO_D", |
504 | .id = AB3100_LDO_D, |
505 | .ops = ®ulator_ops_fixed, |
506 | .type = REGULATOR_VOLTAGE, |
507 | }, |
508 | { |
509 | .name = "LDO_E", |
510 | .id = AB3100_LDO_E, |
511 | .ops = ®ulator_ops_variable_sleepable, |
512 | .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages), |
513 | .type = REGULATOR_VOLTAGE, |
514 | }, |
515 | { |
516 | .name = "LDO_F", |
517 | .id = AB3100_LDO_F, |
518 | .ops = ®ulator_ops_variable, |
519 | .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages), |
520 | .type = REGULATOR_VOLTAGE, |
521 | }, |
522 | { |
523 | .name = "LDO_G", |
524 | .id = AB3100_LDO_G, |
525 | .ops = ®ulator_ops_variable, |
526 | .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages), |
527 | .type = REGULATOR_VOLTAGE, |
528 | }, |
529 | { |
530 | .name = "LDO_H", |
531 | .id = AB3100_LDO_H, |
532 | .ops = ®ulator_ops_variable, |
533 | .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages), |
534 | .type = REGULATOR_VOLTAGE, |
535 | }, |
536 | { |
537 | .name = "LDO_K", |
538 | .id = AB3100_LDO_K, |
539 | .ops = ®ulator_ops_variable, |
540 | .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages), |
541 | .type = REGULATOR_VOLTAGE, |
542 | }, |
543 | { |
544 | .name = "LDO_EXT", |
545 | .id = AB3100_LDO_EXT, |
546 | .ops = ®ulator_ops_external, |
547 | .type = REGULATOR_VOLTAGE, |
548 | }, |
549 | { |
550 | .name = "BUCK", |
551 | .id = AB3100_BUCK, |
552 | .ops = ®ulator_ops_variable_sleepable, |
553 | .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages), |
554 | .type = REGULATOR_VOLTAGE, |
555 | }, |
556 | }; |
557 | |
558 | /* |
559 | * NOTE: the following functions are regulators pluralis - it is the |
560 | * binding to the AB3100 core driver and the parent platform device |
561 | * for all the different regulators. |
562 | */ |
563 | |
564 | static int __devinit ab3100_regulators_probe(struct platform_device *pdev) |
565 | { |
566 | struct ab3100_platform_data *plfdata = pdev->dev.platform_data; |
567 | struct ab3100 *ab3100 = platform_get_drvdata(pdev); |
568 | int err = 0; |
569 | u8 data; |
570 | int i; |
571 | |
572 | /* Check chip state */ |
573 | err = ab3100_get_register_interruptible(ab3100, |
574 | AB3100_LDO_D, &data); |
575 | if (err) { |
576 | dev_err(&pdev->dev, "could not read initial status of LDO_D\n"); |
577 | return err; |
578 | } |
579 | if (data & 0x10) |
580 | dev_notice(&pdev->dev, |
581 | "chip is already in active mode (Warm start)\n"); |
582 | else |
583 | dev_notice(&pdev->dev, |
584 | "chip is in inactive mode (Cold start)\n"); |
585 | |
586 | /* Set up regulators */ |
587 | for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) { |
588 | err = ab3100_set_register_interruptible(ab3100, |
589 | ab3100_reg_init_order[i], |
590 | plfdata->reg_initvals[i]); |
591 | if (err) { |
592 | dev_err(&pdev->dev, "regulator initialization failed with error %d\n", |
593 | err); |
594 | return err; |
595 | } |
596 | } |
597 | |
598 | /* Register the regulators */ |
599 | for (i = 0; i < AB3100_NUM_REGULATORS; i++) { |
600 | struct ab3100_regulator *reg = &ab3100_regulators[i]; |
601 | struct regulator_dev *rdev; |
602 | |
603 | /* |
604 | * Initialize per-regulator struct. |
605 | * Inherit platform data, this comes down from the |
606 | * i2c boarddata, from the machine. So if you want to |
607 | * see what it looks like for a certain machine, go |
608 | * into the machine I2C setup. |
609 | */ |
610 | reg->ab3100 = ab3100; |
611 | reg->plfdata = plfdata; |
612 | |
613 | /* |
614 | * Register the regulator, pass around |
615 | * the ab3100_regulator struct |
616 | */ |
617 | rdev = regulator_register(&ab3100_regulator_desc[i], |
618 | &pdev->dev, |
619 | &plfdata->reg_constraints[i], |
620 | reg); |
621 | |
622 | if (IS_ERR(rdev)) { |
623 | err = PTR_ERR(rdev); |
624 | dev_err(&pdev->dev, |
625 | "%s: failed to register regulator %s err %d\n", |
626 | __func__, ab3100_regulator_desc[i].name, |
627 | err); |
628 | i--; |
629 | /* remove the already registered regulators */ |
630 | while (i > 0) { |
631 | regulator_unregister(ab3100_regulators[i].rdev); |
632 | i--; |
633 | } |
634 | return err; |
635 | } |
636 | |
637 | /* Then set a pointer back to the registered regulator */ |
638 | reg->rdev = rdev; |
639 | } |
640 | |
641 | return 0; |
642 | } |
643 | |
644 | static int __devexit ab3100_regulators_remove(struct platform_device *pdev) |
645 | { |
646 | int i; |
647 | |
648 | for (i = 0; i < AB3100_NUM_REGULATORS; i++) { |
649 | struct ab3100_regulator *reg = &ab3100_regulators[i]; |
650 | |
651 | regulator_unregister(reg->rdev); |
652 | } |
653 | return 0; |
654 | } |
655 | |
656 | static struct platform_driver ab3100_regulators_driver = { |
657 | .driver = { |
658 | .name = "ab3100-regulators", |
659 | .owner = THIS_MODULE, |
660 | }, |
661 | .probe = ab3100_regulators_probe, |
662 | .remove = __devexit_p(ab3100_regulators_remove), |
663 | }; |
664 | |
665 | static __init int ab3100_regulators_init(void) |
666 | { |
667 | return platform_driver_register(&ab3100_regulators_driver); |
668 | } |
669 | |
670 | static __exit void ab3100_regulators_exit(void) |
671 | { |
672 | platform_driver_unregister(&ab3100_regulators_driver); |
673 | } |
674 | |
675 | subsys_initcall(ab3100_regulators_init); |
676 | module_exit(ab3100_regulators_exit); |
677 | |
678 | MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>"); |
679 | MODULE_DESCRIPTION("AB3100 Regulator driver"); |
680 | MODULE_LICENSE("GPL"); |
681 | MODULE_ALIAS("platform:ab3100-regulators"); |
682 |
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