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net: move procfs code to net/core/net-procfs.c
[linux/fpc-iii.git] / drivers / regulator / ab3100.c
blob111ec69a3e9454a40fa96091e4a7bc679cfa5dd1
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/platform_device.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/mfd/ab3100.h>
19 #include <linux/mfd/abx500.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 * @dev: handle to the device
45 * @plfdata: AB3100 platform data passed in at probe time
46 * @regreg: regulator register number in the AB3100
47 */
48 struct ab3100_regulator {
49 struct regulator_dev *rdev;
50 struct device *dev;
51 struct ab3100_platform_data *plfdata;
52 u8 regreg;
53 };
54
55 /* The order in which registers are initialized */
56 static const u8 ab3100_reg_init_order[AB3100_NUM_REGULATORS+2] = {
57 AB3100_LDO_A,
58 AB3100_LDO_C,
59 AB3100_LDO_E,
60 AB3100_LDO_E_SLEEP,
61 AB3100_LDO_F,
62 AB3100_LDO_G,
63 AB3100_LDO_H,
64 AB3100_LDO_K,
65 AB3100_LDO_EXT,
66 AB3100_BUCK,
67 AB3100_BUCK_SLEEP,
68 AB3100_LDO_D,
69 };
70
71 /* Preset (hardware defined) voltages for these regulators */
72 #define LDO_A_VOLTAGE 2750000
73 #define LDO_C_VOLTAGE 2650000
74 #define LDO_D_VOLTAGE 2650000
75
76 static const unsigned int ldo_e_buck_typ_voltages[] = {
77 1800000,
78 1400000,
79 1300000,
80 1200000,
81 1100000,
82 1050000,
83 900000,
84 };
85
86 static const unsigned int ldo_f_typ_voltages[] = {
87 1800000,
88 1400000,
89 1300000,
90 1200000,
91 1100000,
92 1050000,
93 2500000,
94 2650000,
95 };
96
97 static const unsigned int ldo_g_typ_voltages[] = {
98 2850000,
99 2750000,
100 1800000,
101 1500000,
102 };
103
104 static const unsigned int ldo_h_typ_voltages[] = {
105 2750000,
106 1800000,
107 1500000,
108 1200000,
109 };
110
111 static const unsigned int ldo_k_typ_voltages[] = {
112 2750000,
113 1800000,
114 };
115
116
117 /* The regulator devices */
118 static struct ab3100_regulator
119 ab3100_regulators[AB3100_NUM_REGULATORS] = {
120 {
121 .regreg = AB3100_LDO_A,
122 },
123 {
124 .regreg = AB3100_LDO_C,
125 },
126 {
127 .regreg = AB3100_LDO_D,
128 },
129 {
130 .regreg = AB3100_LDO_E,
131 },
132 {
133 .regreg = AB3100_LDO_F,
134 },
135 {
136 .regreg = AB3100_LDO_G,
137 },
138 {
139 .regreg = AB3100_LDO_H,
140 },
141 {
142 .regreg = AB3100_LDO_K,
143 },
144 {
145 .regreg = AB3100_LDO_EXT,
146 /* No voltages for the external regulator */
147 },
148 {
149 .regreg = AB3100_BUCK,
150 },
151 };
152
153 /*
154 * General functions for enable, disable and is_enabled used for
155 * LDO: A,C,E,F,G,H,K,EXT and BUCK
156 */
157 static int ab3100_enable_regulator(struct regulator_dev *reg)
158 {
159 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
160 int err;
161 u8 regval;
162
163 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
164 &regval);
165 if (err) {
166 dev_warn(&reg->dev, "failed to get regid %d value\n",
167 abreg->regreg);
168 return err;
169 }
170
171 /* The regulator is already on, no reason to go further */
172 if (regval & AB3100_REG_ON_MASK)
173 return 0;
174
175 regval |= AB3100_REG_ON_MASK;
176
177 err = abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
178 regval);
179 if (err) {
180 dev_warn(&reg->dev, "failed to set regid %d value\n",
181 abreg->regreg);
182 return err;
183 }
184
185 return 0;
186 }
187
188 static int ab3100_disable_regulator(struct regulator_dev *reg)
189 {
190 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
191 int err;
192 u8 regval;
193
194 /*
195 * LDO D is a special regulator. When it is disabled, the entire
196 * system is shut down. So this is handled specially.
197 */
198 pr_info("Called ab3100_disable_regulator\n");
199 if (abreg->regreg == AB3100_LDO_D) {
200 dev_info(&reg->dev, "disabling LDO D - shut down system\n");
201 /* Setting LDO D to 0x00 cuts the power to the SoC */
202 return abx500_set_register_interruptible(abreg->dev, 0,
203 AB3100_LDO_D, 0x00U);
204 }
205
206 /*
207 * All other regulators are handled here
208 */
209 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
210 &regval);
211 if (err) {
212 dev_err(&reg->dev, "unable to get register 0x%x\n",
213 abreg->regreg);
214 return err;
215 }
216 regval &= ~AB3100_REG_ON_MASK;
217 return abx500_set_register_interruptible(abreg->dev, 0, abreg->regreg,
218 regval);
219 }
220
221 static int ab3100_is_enabled_regulator(struct regulator_dev *reg)
222 {
223 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
224 u8 regval;
225 int err;
226
227 err = abx500_get_register_interruptible(abreg->dev, 0, abreg->regreg,
228 &regval);
229 if (err) {
230 dev_err(&reg->dev, "unable to get register 0x%x\n",
231 abreg->regreg);
232 return err;
233 }
234
235 return regval & AB3100_REG_ON_MASK;
236 }
237
238 static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
239 {
240 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
241 u8 regval;
242 int err;
243
244 /*
245 * For variable types, read out setting and index into
246 * supplied voltage list.
247 */
248 err = abx500_get_register_interruptible(abreg->dev, 0,
249 abreg->regreg, &regval);
250 if (err) {
251 dev_warn(&reg->dev,
252 "failed to get regulator value in register %02x\n",
253 abreg->regreg);
254 return err;
255 }
256
257 /* The 3 highest bits index voltages */
258 regval &= 0xE0;
259 regval >>= 5;
260
261 if (regval >= reg->desc->n_voltages) {
262 dev_err(&reg->dev,
263 "regulator register %02x contains an illegal voltage setting\n",
264 abreg->regreg);
265 return -EINVAL;
266 }
267
268 return reg->desc->volt_table[regval];
269 }
270
271 static int ab3100_set_voltage_regulator_sel(struct regulator_dev *reg,
272 unsigned selector)
273 {
274 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
275 u8 regval;
276 int err;
277
278 err = abx500_get_register_interruptible(abreg->dev, 0,
279 abreg->regreg, &regval);
280 if (err) {
281 dev_warn(&reg->dev,
282 "failed to get regulator register %02x\n",
283 abreg->regreg);
284 return err;
285 }
286
287 /* The highest three bits control the variable regulators */
288 regval &= ~0xE0;
289 regval |= (selector << 5);
290
291 err = abx500_set_register_interruptible(abreg->dev, 0,
292 abreg->regreg, regval);
293 if (err)
294 dev_warn(&reg->dev, "failed to set regulator register %02x\n",
295 abreg->regreg);
296
297 return err;
298 }
299
300 static int ab3100_set_suspend_voltage_regulator(struct regulator_dev *reg,
301 int uV)
302 {
303 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
304 u8 regval;
305 int err;
306 int bestindex;
307 u8 targetreg;
308
309 if (abreg->regreg == AB3100_LDO_E)
310 targetreg = AB3100_LDO_E_SLEEP;
311 else if (abreg->regreg == AB3100_BUCK)
312 targetreg = AB3100_BUCK_SLEEP;
313 else
314 return -EINVAL;
315
316 /* LDO E and BUCK have special suspend voltages you can set */
317 bestindex = regulator_map_voltage_iterate(reg, uV, uV);
318
319 err = abx500_get_register_interruptible(abreg->dev, 0,
320 targetreg, &regval);
321 if (err) {
322 dev_warn(&reg->dev,
323 "failed to get regulator register %02x\n",
324 targetreg);
325 return err;
326 }
327
328 /* The highest three bits control the variable regulators */
329 regval &= ~0xE0;
330 regval |= (bestindex << 5);
331
332 err = abx500_set_register_interruptible(abreg->dev, 0,
333 targetreg, regval);
334 if (err)
335 dev_warn(&reg->dev, "failed to set regulator register %02x\n",
336 abreg->regreg);
337
338 return err;
339 }
340
341 /*
342 * The external regulator can just define a fixed voltage.
343 */
344 static int ab3100_get_voltage_regulator_external(struct regulator_dev *reg)
345 {
346 struct ab3100_regulator *abreg = rdev_get_drvdata(reg);
347
348 return abreg->plfdata->external_voltage;
349 }
350
351 static struct regulator_ops regulator_ops_fixed = {
352 .list_voltage = regulator_list_voltage_linear,
353 .enable = ab3100_enable_regulator,
354 .disable = ab3100_disable_regulator,
355 .is_enabled = ab3100_is_enabled_regulator,
356 };
357
358 static struct regulator_ops regulator_ops_variable = {
359 .enable = ab3100_enable_regulator,
360 .disable = ab3100_disable_regulator,
361 .is_enabled = ab3100_is_enabled_regulator,
362 .get_voltage = ab3100_get_voltage_regulator,
363 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
364 .list_voltage = regulator_list_voltage_table,
365 };
366
367 static struct regulator_ops regulator_ops_variable_sleepable = {
368 .enable = ab3100_enable_regulator,
369 .disable = ab3100_disable_regulator,
370 .is_enabled = ab3100_is_enabled_regulator,
371 .get_voltage = ab3100_get_voltage_regulator,
372 .set_voltage_sel = ab3100_set_voltage_regulator_sel,
373 .set_suspend_voltage = ab3100_set_suspend_voltage_regulator,
374 .list_voltage = regulator_list_voltage_table,
375 };
376
377 /*
378 * LDO EXT is an external regulator so it is really
379 * not possible to set any voltage locally here, AB3100
380 * is an on/off switch plain an simple. The external
381 * voltage is defined in the board set-up if any.
382 */
383 static struct regulator_ops regulator_ops_external = {
384 .enable = ab3100_enable_regulator,
385 .disable = ab3100_disable_regulator,
386 .is_enabled = ab3100_is_enabled_regulator,
387 .get_voltage = ab3100_get_voltage_regulator_external,
388 };
389
390 static struct regulator_desc
391 ab3100_regulator_desc[AB3100_NUM_REGULATORS] = {
392 {
393 .name = "LDO_A",
394 .id = AB3100_LDO_A,
395 .ops = &regulator_ops_fixed,
396 .n_voltages = 1,
397 .type = REGULATOR_VOLTAGE,
398 .owner = THIS_MODULE,
399 .min_uV = LDO_A_VOLTAGE,
400 .enable_time = 200,
401 },
402 {
403 .name = "LDO_C",
404 .id = AB3100_LDO_C,
405 .ops = &regulator_ops_fixed,
406 .n_voltages = 1,
407 .type = REGULATOR_VOLTAGE,
408 .owner = THIS_MODULE,
409 .min_uV = LDO_C_VOLTAGE,
410 .enable_time = 200,
411 },
412 {
413 .name = "LDO_D",
414 .id = AB3100_LDO_D,
415 .ops = &regulator_ops_fixed,
416 .n_voltages = 1,
417 .type = REGULATOR_VOLTAGE,
418 .owner = THIS_MODULE,
419 .min_uV = LDO_D_VOLTAGE,
420 .enable_time = 200,
421 },
422 {
423 .name = "LDO_E",
424 .id = AB3100_LDO_E,
425 .ops = &regulator_ops_variable_sleepable,
426 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
427 .volt_table = ldo_e_buck_typ_voltages,
428 .type = REGULATOR_VOLTAGE,
429 .owner = THIS_MODULE,
430 .enable_time = 200,
431 },
432 {
433 .name = "LDO_F",
434 .id = AB3100_LDO_F,
435 .ops = &regulator_ops_variable,
436 .n_voltages = ARRAY_SIZE(ldo_f_typ_voltages),
437 .volt_table = ldo_f_typ_voltages,
438 .type = REGULATOR_VOLTAGE,
439 .owner = THIS_MODULE,
440 .enable_time = 600,
441 },
442 {
443 .name = "LDO_G",
444 .id = AB3100_LDO_G,
445 .ops = &regulator_ops_variable,
446 .n_voltages = ARRAY_SIZE(ldo_g_typ_voltages),
447 .volt_table = ldo_g_typ_voltages,
448 .type = REGULATOR_VOLTAGE,
449 .owner = THIS_MODULE,
450 .enable_time = 400,
451 },
452 {
453 .name = "LDO_H",
454 .id = AB3100_LDO_H,
455 .ops = &regulator_ops_variable,
456 .n_voltages = ARRAY_SIZE(ldo_h_typ_voltages),
457 .volt_table = ldo_h_typ_voltages,
458 .type = REGULATOR_VOLTAGE,
459 .owner = THIS_MODULE,
460 .enable_time = 200,
461 },
462 {
463 .name = "LDO_K",
464 .id = AB3100_LDO_K,
465 .ops = &regulator_ops_variable,
466 .n_voltages = ARRAY_SIZE(ldo_k_typ_voltages),
467 .volt_table = ldo_k_typ_voltages,
468 .type = REGULATOR_VOLTAGE,
469 .owner = THIS_MODULE,
470 .enable_time = 200,
471 },
472 {
473 .name = "LDO_EXT",
474 .id = AB3100_LDO_EXT,
475 .ops = &regulator_ops_external,
476 .type = REGULATOR_VOLTAGE,
477 .owner = THIS_MODULE,
478 },
479 {
480 .name = "BUCK",
481 .id = AB3100_BUCK,
482 .ops = &regulator_ops_variable_sleepable,
483 .n_voltages = ARRAY_SIZE(ldo_e_buck_typ_voltages),
484 .volt_table = ldo_e_buck_typ_voltages,
485 .type = REGULATOR_VOLTAGE,
486 .owner = THIS_MODULE,
487 .enable_time = 1000,
488 },
489 };
490
491 /*
492 * NOTE: the following functions are regulators pluralis - it is the
493 * binding to the AB3100 core driver and the parent platform device
494 * for all the different regulators.
495 */
496
497 static int ab3100_regulators_probe(struct platform_device *pdev)
498 {
499 struct ab3100_platform_data *plfdata = pdev->dev.platform_data;
500 struct regulator_config config = { };
501 int err = 0;
502 u8 data;
503 int i;
504
505 /* Check chip state */
506 err = abx500_get_register_interruptible(&pdev->dev, 0,
507 AB3100_LDO_D, &data);
508 if (err) {
509 dev_err(&pdev->dev, "could not read initial status of LDO_D\n");
510 return err;
511 }
512 if (data & 0x10)
513 dev_notice(&pdev->dev,
514 "chip is already in active mode (Warm start)\n");
515 else
516 dev_notice(&pdev->dev,
517 "chip is in inactive mode (Cold start)\n");
518
519 /* Set up regulators */
520 for (i = 0; i < ARRAY_SIZE(ab3100_reg_init_order); i++) {
521 err = abx500_set_register_interruptible(&pdev->dev, 0,
522 ab3100_reg_init_order[i],
523 plfdata->reg_initvals[i]);
524 if (err) {
525 dev_err(&pdev->dev, "regulator initialization failed with error %d\n",
526 err);
527 return err;
528 }
529 }
530
531 /* Register the regulators */
532 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
533 struct ab3100_regulator *reg = &ab3100_regulators[i];
534 struct regulator_dev *rdev;
535
536 /*
537 * Initialize per-regulator struct.
538 * Inherit platform data, this comes down from the
539 * i2c boarddata, from the machine. So if you want to
540 * see what it looks like for a certain machine, go
541 * into the machine I2C setup.
542 */
543 reg->dev = &pdev->dev;
544 reg->plfdata = plfdata;
545
546 config.dev = &pdev->dev;
547 config.driver_data = reg;
548 config.init_data = &plfdata->reg_constraints[i];
549
550 /*
551 * Register the regulator, pass around
552 * the ab3100_regulator struct
553 */
554 rdev = regulator_register(&ab3100_regulator_desc[i], &config);
555 if (IS_ERR(rdev)) {
556 err = PTR_ERR(rdev);
557 dev_err(&pdev->dev,
558 "%s: failed to register regulator %s err %d\n",
559 __func__, ab3100_regulator_desc[i].name,
560 err);
561 /* remove the already registered regulators */
562 while (--i >= 0)
563 regulator_unregister(ab3100_regulators[i].rdev);
564 return err;
565 }
566
567 /* Then set a pointer back to the registered regulator */
568 reg->rdev = rdev;
569 }
570
571 return 0;
572 }
573
574 static int ab3100_regulators_remove(struct platform_device *pdev)
575 {
576 int i;
577
578 for (i = 0; i < AB3100_NUM_REGULATORS; i++) {
579 struct ab3100_regulator *reg = &ab3100_regulators[i];
580
581 regulator_unregister(reg->rdev);
582 }
583 return 0;
584 }
585
586 static struct platform_driver ab3100_regulators_driver = {
587 .driver = {
588 .name = "ab3100-regulators",
589 .owner = THIS_MODULE,
590 },
591 .probe = ab3100_regulators_probe,
592 .remove = ab3100_regulators_remove,
593 };
594
595 static __init int ab3100_regulators_init(void)
596 {
597 return platform_driver_register(&ab3100_regulators_driver);
598 }
599
600 static __exit void ab3100_regulators_exit(void)
601 {
602 platform_driver_unregister(&ab3100_regulators_driver);
603 }
604
605 subsys_initcall(ab3100_regulators_init);
606 module_exit(ab3100_regulators_exit);
607
608 MODULE_AUTHOR("Mattias Wallin <mattias.wallin@stericsson.com>");
609 MODULE_DESCRIPTION("AB3100 Regulator driver");
610 MODULE_LICENSE("GPL");
611 MODULE_ALIAS("platform:ab3100-regulators");
Linux with added FPC-III support