?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 2.6.34-rc3
[pohmelfs.git] / drivers / regulator / wm831x-dcdc.c
blob6e18e56d850ba7159312938baf59d6f50ecc3fa3
1 /*
2 * wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 */
13
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/bitops.h>
18 #include <linux/err.h>
19 #include <linux/i2c.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/machine.h>
23 #include <linux/gpio.h>
24
25 #include <linux/mfd/wm831x/core.h>
26 #include <linux/mfd/wm831x/regulator.h>
27 #include <linux/mfd/wm831x/pdata.h>
28
29 #define WM831X_BUCKV_MAX_SELECTOR 0x68
30 #define WM831X_BUCKP_MAX_SELECTOR 0x66
31
32 #define WM831X_DCDC_MODE_FAST 0
33 #define WM831X_DCDC_MODE_NORMAL 1
34 #define WM831X_DCDC_MODE_IDLE 2
35 #define WM831X_DCDC_MODE_STANDBY 3
36
37 #define WM831X_DCDC_MAX_NAME 6
38
39 /* Register offsets in control block */
40 #define WM831X_DCDC_CONTROL_1 0
41 #define WM831X_DCDC_CONTROL_2 1
42 #define WM831X_DCDC_ON_CONFIG 2
43 #define WM831X_DCDC_SLEEP_CONTROL 3
44 #define WM831X_DCDC_DVS_CONTROL 4
45
46 /*
47 * Shared
48 */
49
50 struct wm831x_dcdc {
51 char name[WM831X_DCDC_MAX_NAME];
52 struct regulator_desc desc;
53 int base;
54 struct wm831x *wm831x;
55 struct regulator_dev *regulator;
56 int dvs_gpio;
57 int dvs_gpio_state;
58 int on_vsel;
59 int dvs_vsel;
60 };
61
62 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
63 {
64 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
65 struct wm831x *wm831x = dcdc->wm831x;
66 int mask = 1 << rdev_get_id(rdev);
67 int reg;
68
69 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
70 if (reg < 0)
71 return reg;
72
73 if (reg & mask)
74 return 1;
75 else
76 return 0;
77 }
78
79 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
80 {
81 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
82 struct wm831x *wm831x = dcdc->wm831x;
83 int mask = 1 << rdev_get_id(rdev);
84
85 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
86 }
87
88 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
89 {
90 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
91 struct wm831x *wm831x = dcdc->wm831x;
92 int mask = 1 << rdev_get_id(rdev);
93
94 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
95 }
96
97 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
98
99 {
100 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
101 struct wm831x *wm831x = dcdc->wm831x;
102 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
103 int val;
104
105 val = wm831x_reg_read(wm831x, reg);
106 if (val < 0)
107 return val;
108
109 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
110
111 switch (val) {
112 case WM831X_DCDC_MODE_FAST:
113 return REGULATOR_MODE_FAST;
114 case WM831X_DCDC_MODE_NORMAL:
115 return REGULATOR_MODE_NORMAL;
116 case WM831X_DCDC_MODE_STANDBY:
117 return REGULATOR_MODE_STANDBY;
118 case WM831X_DCDC_MODE_IDLE:
119 return REGULATOR_MODE_IDLE;
120 default:
121 BUG();
122 }
123 }
124
125 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
126 unsigned int mode)
127 {
128 int val;
129
130 switch (mode) {
131 case REGULATOR_MODE_FAST:
132 val = WM831X_DCDC_MODE_FAST;
133 break;
134 case REGULATOR_MODE_NORMAL:
135 val = WM831X_DCDC_MODE_NORMAL;
136 break;
137 case REGULATOR_MODE_STANDBY:
138 val = WM831X_DCDC_MODE_STANDBY;
139 break;
140 case REGULATOR_MODE_IDLE:
141 val = WM831X_DCDC_MODE_IDLE;
142 break;
143 default:
144 return -EINVAL;
145 }
146
147 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
148 val << WM831X_DC1_ON_MODE_SHIFT);
149 }
150
151 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
152 {
153 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
154 struct wm831x *wm831x = dcdc->wm831x;
155 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
156
157 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
158 }
159
160 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
161 unsigned int mode)
162 {
163 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
164 struct wm831x *wm831x = dcdc->wm831x;
165 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
166
167 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
168 }
169
170 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
171 {
172 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
173 struct wm831x *wm831x = dcdc->wm831x;
174 int ret;
175
176 /* First, check for errors */
177 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
178 if (ret < 0)
179 return ret;
180
181 if (ret & (1 << rdev_get_id(rdev))) {
182 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
183 rdev_get_id(rdev) + 1);
184 return REGULATOR_STATUS_ERROR;
185 }
186
187 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
188 if (rdev_get_id(rdev) < 2) {
189 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
190 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
191 rdev_get_id(rdev) + 1);
192 return REGULATOR_STATUS_ERROR;
193 }
194
195 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
196 dev_dbg(wm831x->dev, "DCDC%d over current\n",
197 rdev_get_id(rdev) + 1);
198 return REGULATOR_STATUS_ERROR;
199 }
200 }
201
202 /* Is the regulator on? */
203 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
204 if (ret < 0)
205 return ret;
206 if (!(ret & (1 << rdev_get_id(rdev))))
207 return REGULATOR_STATUS_OFF;
208
209 /* TODO: When we handle hardware control modes so we can report the
210 * current mode. */
211 return REGULATOR_STATUS_ON;
212 }
213
214 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
215 {
216 struct wm831x_dcdc *dcdc = data;
217
218 regulator_notifier_call_chain(dcdc->regulator,
219 REGULATOR_EVENT_UNDER_VOLTAGE,
220 NULL);
221
222 return IRQ_HANDLED;
223 }
224
225 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
226 {
227 struct wm831x_dcdc *dcdc = data;
228
229 regulator_notifier_call_chain(dcdc->regulator,
230 REGULATOR_EVENT_OVER_CURRENT,
231 NULL);
232
233 return IRQ_HANDLED;
234 }
235
236 /*
237 * BUCKV specifics
238 */
239
240 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
241 unsigned selector)
242 {
243 if (selector <= 0x8)
244 return 600000;
245 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
246 return 600000 + ((selector - 0x8) * 12500);
247 return -EINVAL;
248 }
249
250 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
251 int min_uV, int max_uV)
252 {
253 u16 vsel;
254
255 if (min_uV < 600000)
256 vsel = 0;
257 else if (min_uV <= 1800000)
258 vsel = ((min_uV - 600000) / 12500) + 8;
259 else
260 return -EINVAL;
261
262 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
263 return -EINVAL;
264
265 return vsel;
266 }
267
268 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
269 int min_uV, int max_uV)
270 {
271 u16 vsel;
272
273 if (max_uV < 600000 || max_uV > 1800000)
274 return -EINVAL;
275
276 vsel = ((max_uV - 600000) / 12500) + 8;
277
278 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
279 wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
280 return -EINVAL;
281
282 return vsel;
283 }
284
285 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
286 {
287 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
288
289 if (state == dcdc->dvs_gpio_state)
290 return 0;
291
292 dcdc->dvs_gpio_state = state;
293 gpio_set_value(dcdc->dvs_gpio, state);
294
295 /* Should wait for DVS state change to be asserted if we have
296 * a GPIO for it, for now assume the device is configured
297 * for the fastest possible transition.
298 */
299
300 return 0;
301 }
302
303 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
304 int min_uV, int max_uV)
305 {
306 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
307 struct wm831x *wm831x = dcdc->wm831x;
308 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
309 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
310 int vsel, ret;
311
312 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
313 if (vsel < 0)
314 return vsel;
315
316 /* If this value is already set then do a GPIO update if we can */
317 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
318 return wm831x_buckv_set_dvs(rdev, 0);
319
320 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
321 return wm831x_buckv_set_dvs(rdev, 1);
322
323 /* Always set the ON status to the minimum voltage */
324 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
325 if (ret < 0)
326 return ret;
327 dcdc->on_vsel = vsel;
328
329 if (!dcdc->dvs_gpio)
330 return ret;
331
332 /* Kick the voltage transition now */
333 ret = wm831x_buckv_set_dvs(rdev, 0);
334 if (ret < 0)
335 return ret;
336
337 /* Set the high voltage as the DVS voltage. This is optimised
338 * for CPUfreq usage, most processors will keep the maximum
339 * voltage constant and lower the minimum with the frequency. */
340 vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
341 if (vsel < 0) {
342 /* This should never happen - at worst the same vsel
343 * should be chosen */
344 WARN_ON(vsel < 0);
345 return 0;
346 }
347
348 /* Don't bother if it's the same VSEL we're already using */
349 if (vsel == dcdc->on_vsel)
350 return 0;
351
352 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
353 if (ret == 0)
354 dcdc->dvs_vsel = vsel;
355 else
356 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
357 ret);
358
359 return 0;
360 }
361
362 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
363 int uV)
364 {
365 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
366 struct wm831x *wm831x = dcdc->wm831x;
367 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
368 int vsel;
369
370 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
371 if (vsel < 0)
372 return vsel;
373
374 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
375 }
376
377 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
378 {
379 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
380
381 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
382 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel);
383 else
384 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel);
385 }
386
387 /* Current limit options */
388 static u16 wm831x_dcdc_ilim[] = {
389 125, 250, 375, 500, 625, 750, 875, 1000
390 };
391
392 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
393 int min_uA, int max_uA)
394 {
395 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
396 struct wm831x *wm831x = dcdc->wm831x;
397 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
398 int i;
399
400 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
401 if (max_uA <= wm831x_dcdc_ilim[i])
402 break;
403 }
404 if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
405 return -EINVAL;
406
407 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
408 }
409
410 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
411 {
412 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
413 struct wm831x *wm831x = dcdc->wm831x;
414 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
415 int val;
416
417 val = wm831x_reg_read(wm831x, reg);
418 if (val < 0)
419 return val;
420
421 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
422 }
423
424 static struct regulator_ops wm831x_buckv_ops = {
425 .set_voltage = wm831x_buckv_set_voltage,
426 .get_voltage = wm831x_buckv_get_voltage,
427 .list_voltage = wm831x_buckv_list_voltage,
428 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
429 .set_current_limit = wm831x_buckv_set_current_limit,
430 .get_current_limit = wm831x_buckv_get_current_limit,
431
432 .is_enabled = wm831x_dcdc_is_enabled,
433 .enable = wm831x_dcdc_enable,
434 .disable = wm831x_dcdc_disable,
435 .get_status = wm831x_dcdc_get_status,
436 .get_mode = wm831x_dcdc_get_mode,
437 .set_mode = wm831x_dcdc_set_mode,
438 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
439 };
440
441 /*
442 * Set up DVS control. We just log errors since we can still run
443 * (with reduced performance) if we fail.
444 */
445 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
446 struct wm831x_buckv_pdata *pdata)
447 {
448 struct wm831x *wm831x = dcdc->wm831x;
449 int ret;
450 u16 ctrl;
451
452 if (!pdata || !pdata->dvs_gpio)
453 return;
454
455 switch (pdata->dvs_control_src) {
456 case 1:
457 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
458 break;
459 case 2:
460 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
461 break;
462 default:
463 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
464 pdata->dvs_control_src, dcdc->name);
465 return;
466 }
467
468 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
469 WM831X_DC1_DVS_SRC_MASK, ctrl);
470 if (ret < 0) {
471 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
472 dcdc->name, ret);
473 return;
474 }
475
476 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
477 if (ret < 0) {
478 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
479 dcdc->name, ret);
480 return;
481 }
482
483 /* gpiolib won't let us read the GPIO status so pick the higher
484 * of the two existing voltages so we take it as platform data.
485 */
486 dcdc->dvs_gpio_state = pdata->dvs_init_state;
487
488 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
489 if (ret < 0) {
490 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
491 dcdc->name, ret);
492 gpio_free(pdata->dvs_gpio);
493 return;
494 }
495
496 dcdc->dvs_gpio = pdata->dvs_gpio;
497 }
498
499 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
500 {
501 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
502 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
503 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
504 struct wm831x_dcdc *dcdc;
505 struct resource *res;
506 int ret, irq;
507
508 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
509
510 if (pdata == NULL || pdata->dcdc[id] == NULL)
511 return -ENODEV;
512
513 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
514 if (dcdc == NULL) {
515 dev_err(&pdev->dev, "Unable to allocate private data\n");
516 return -ENOMEM;
517 }
518
519 dcdc->wm831x = wm831x;
520
521 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
522 if (res == NULL) {
523 dev_err(&pdev->dev, "No I/O resource\n");
524 ret = -EINVAL;
525 goto err;
526 }
527 dcdc->base = res->start;
528
529 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
530 dcdc->desc.name = dcdc->name;
531 dcdc->desc.id = id;
532 dcdc->desc.type = REGULATOR_VOLTAGE;
533 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
534 dcdc->desc.ops = &wm831x_buckv_ops;
535 dcdc->desc.owner = THIS_MODULE;
536
537 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
538 if (ret < 0) {
539 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
540 goto err;
541 }
542 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
543
544 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
545 if (ret < 0) {
546 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
547 goto err;
548 }
549 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
550
551 if (pdata->dcdc[id])
552 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
553
554 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
555 pdata->dcdc[id], dcdc);
556 if (IS_ERR(dcdc->regulator)) {
557 ret = PTR_ERR(dcdc->regulator);
558 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
559 id + 1, ret);
560 goto err;
561 }
562
563 irq = platform_get_irq_byname(pdev, "UV");
564 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
565 IRQF_TRIGGER_RISING, dcdc->name,
566 dcdc);
567 if (ret != 0) {
568 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
569 irq, ret);
570 goto err_regulator;
571 }
572
573 irq = platform_get_irq_byname(pdev, "HC");
574 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
575 IRQF_TRIGGER_RISING, dcdc->name,
576 dcdc);
577 if (ret != 0) {
578 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
579 irq, ret);
580 goto err_uv;
581 }
582
583 platform_set_drvdata(pdev, dcdc);
584
585 return 0;
586
587 err_uv:
588 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
589 err_regulator:
590 regulator_unregister(dcdc->regulator);
591 err:
592 if (dcdc->dvs_gpio)
593 gpio_free(dcdc->dvs_gpio);
594 kfree(dcdc);
595 return ret;
596 }
597
598 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
599 {
600 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
601 struct wm831x *wm831x = dcdc->wm831x;
602
603 platform_set_drvdata(pdev, NULL);
604
605 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
606 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
607 regulator_unregister(dcdc->regulator);
608 if (dcdc->dvs_gpio)
609 gpio_free(dcdc->dvs_gpio);
610 kfree(dcdc);
611
612 return 0;
613 }
614
615 static struct platform_driver wm831x_buckv_driver = {
616 .probe = wm831x_buckv_probe,
617 .remove = __devexit_p(wm831x_buckv_remove),
618 .driver = {
619 .name = "wm831x-buckv",
620 .owner = THIS_MODULE,
621 },
622 };
623
624 /*
625 * BUCKP specifics
626 */
627
628 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
629 unsigned selector)
630 {
631 if (selector <= WM831X_BUCKP_MAX_SELECTOR)
632 return 850000 + (selector * 25000);
633 else
634 return -EINVAL;
635 }
636
637 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
638 int min_uV, int max_uV)
639 {
640 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
641 struct wm831x *wm831x = dcdc->wm831x;
642 u16 vsel;
643
644 if (min_uV <= 34000000)
645 vsel = (min_uV - 850000) / 25000;
646 else
647 return -EINVAL;
648
649 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
650 return -EINVAL;
651
652 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
653 }
654
655 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
656 int min_uV, int max_uV)
657 {
658 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
659 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
660
661 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
662 }
663
664 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
665 int uV)
666 {
667 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
668 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
669
670 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
671 }
672
673 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
674 {
675 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
676 struct wm831x *wm831x = dcdc->wm831x;
677 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
678 int val;
679
680 val = wm831x_reg_read(wm831x, reg);
681 if (val < 0)
682 return val;
683
684 return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
685 }
686
687 static struct regulator_ops wm831x_buckp_ops = {
688 .set_voltage = wm831x_buckp_set_voltage,
689 .get_voltage = wm831x_buckp_get_voltage,
690 .list_voltage = wm831x_buckp_list_voltage,
691 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
692
693 .is_enabled = wm831x_dcdc_is_enabled,
694 .enable = wm831x_dcdc_enable,
695 .disable = wm831x_dcdc_disable,
696 .get_status = wm831x_dcdc_get_status,
697 .get_mode = wm831x_dcdc_get_mode,
698 .set_mode = wm831x_dcdc_set_mode,
699 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
700 };
701
702 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
703 {
704 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
705 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
706 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
707 struct wm831x_dcdc *dcdc;
708 struct resource *res;
709 int ret, irq;
710
711 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
712
713 if (pdata == NULL || pdata->dcdc[id] == NULL)
714 return -ENODEV;
715
716 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
717 if (dcdc == NULL) {
718 dev_err(&pdev->dev, "Unable to allocate private data\n");
719 return -ENOMEM;
720 }
721
722 dcdc->wm831x = wm831x;
723
724 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
725 if (res == NULL) {
726 dev_err(&pdev->dev, "No I/O resource\n");
727 ret = -EINVAL;
728 goto err;
729 }
730 dcdc->base = res->start;
731
732 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
733 dcdc->desc.name = dcdc->name;
734 dcdc->desc.id = id;
735 dcdc->desc.type = REGULATOR_VOLTAGE;
736 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
737 dcdc->desc.ops = &wm831x_buckp_ops;
738 dcdc->desc.owner = THIS_MODULE;
739
740 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
741 pdata->dcdc[id], dcdc);
742 if (IS_ERR(dcdc->regulator)) {
743 ret = PTR_ERR(dcdc->regulator);
744 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
745 id + 1, ret);
746 goto err;
747 }
748
749 irq = platform_get_irq_byname(pdev, "UV");
750 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
751 IRQF_TRIGGER_RISING, dcdc->name,
752 dcdc);
753 if (ret != 0) {
754 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
755 irq, ret);
756 goto err_regulator;
757 }
758
759 platform_set_drvdata(pdev, dcdc);
760
761 return 0;
762
763 err_regulator:
764 regulator_unregister(dcdc->regulator);
765 err:
766 kfree(dcdc);
767 return ret;
768 }
769
770 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
771 {
772 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
773 struct wm831x *wm831x = dcdc->wm831x;
774
775 platform_set_drvdata(pdev, NULL);
776
777 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
778 regulator_unregister(dcdc->regulator);
779 kfree(dcdc);
780
781 return 0;
782 }
783
784 static struct platform_driver wm831x_buckp_driver = {
785 .probe = wm831x_buckp_probe,
786 .remove = __devexit_p(wm831x_buckp_remove),
787 .driver = {
788 .name = "wm831x-buckp",
789 .owner = THIS_MODULE,
790 },
791 };
792
793 /*
794 * DCDC boost convertors
795 */
796
797 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
798 {
799 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
800 struct wm831x *wm831x = dcdc->wm831x;
801 int ret;
802
803 /* First, check for errors */
804 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
805 if (ret < 0)
806 return ret;
807
808 if (ret & (1 << rdev_get_id(rdev))) {
809 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
810 rdev_get_id(rdev) + 1);
811 return REGULATOR_STATUS_ERROR;
812 }
813
814 /* Is the regulator on? */
815 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
816 if (ret < 0)
817 return ret;
818 if (ret & (1 << rdev_get_id(rdev)))
819 return REGULATOR_STATUS_ON;
820 else
821 return REGULATOR_STATUS_OFF;
822 }
823
824 static struct regulator_ops wm831x_boostp_ops = {
825 .get_status = wm831x_boostp_get_status,
826
827 .is_enabled = wm831x_dcdc_is_enabled,
828 .enable = wm831x_dcdc_enable,
829 .disable = wm831x_dcdc_disable,
830 };
831
832 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
833 {
834 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
835 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
836 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
837 struct wm831x_dcdc *dcdc;
838 struct resource *res;
839 int ret, irq;
840
841 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
842
843 if (pdata == NULL || pdata->dcdc[id] == NULL)
844 return -ENODEV;
845
846 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
847 if (dcdc == NULL) {
848 dev_err(&pdev->dev, "Unable to allocate private data\n");
849 return -ENOMEM;
850 }
851
852 dcdc->wm831x = wm831x;
853
854 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
855 if (res == NULL) {
856 dev_err(&pdev->dev, "No I/O resource\n");
857 ret = -EINVAL;
858 goto err;
859 }
860 dcdc->base = res->start;
861
862 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
863 dcdc->desc.name = dcdc->name;
864 dcdc->desc.id = id;
865 dcdc->desc.type = REGULATOR_VOLTAGE;
866 dcdc->desc.ops = &wm831x_boostp_ops;
867 dcdc->desc.owner = THIS_MODULE;
868
869 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
870 pdata->dcdc[id], dcdc);
871 if (IS_ERR(dcdc->regulator)) {
872 ret = PTR_ERR(dcdc->regulator);
873 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
874 id + 1, ret);
875 goto err;
876 }
877
878 irq = platform_get_irq_byname(pdev, "UV");
879 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
880 IRQF_TRIGGER_RISING, dcdc->name,
881 dcdc);
882 if (ret != 0) {
883 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
884 irq, ret);
885 goto err_regulator;
886 }
887
888 platform_set_drvdata(pdev, dcdc);
889
890 return 0;
891
892 err_regulator:
893 regulator_unregister(dcdc->regulator);
894 err:
895 kfree(dcdc);
896 return ret;
897 }
898
899 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
900 {
901 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
902 struct wm831x *wm831x = dcdc->wm831x;
903
904 platform_set_drvdata(pdev, NULL);
905
906 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
907 regulator_unregister(dcdc->regulator);
908 kfree(dcdc);
909
910 return 0;
911 }
912
913 static struct platform_driver wm831x_boostp_driver = {
914 .probe = wm831x_boostp_probe,
915 .remove = __devexit_p(wm831x_boostp_remove),
916 .driver = {
917 .name = "wm831x-boostp",
918 .owner = THIS_MODULE,
919 },
920 };
921
922 /*
923 * External Power Enable
924 *
925 * These aren't actually DCDCs but look like them in hardware so share
926 * code.
927 */
928
929 #define WM831X_EPE_BASE 6
930
931 static struct regulator_ops wm831x_epe_ops = {
932 .is_enabled = wm831x_dcdc_is_enabled,
933 .enable = wm831x_dcdc_enable,
934 .disable = wm831x_dcdc_disable,
935 .get_status = wm831x_dcdc_get_status,
936 };
937
938 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
939 {
940 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
941 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
942 int id = pdev->id % ARRAY_SIZE(pdata->epe);
943 struct wm831x_dcdc *dcdc;
944 int ret;
945
946 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
947
948 if (pdata == NULL || pdata->epe[id] == NULL)
949 return -ENODEV;
950
951 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
952 if (dcdc == NULL) {
953 dev_err(&pdev->dev, "Unable to allocate private data\n");
954 return -ENOMEM;
955 }
956
957 dcdc->wm831x = wm831x;
958
959 /* For current parts this is correct; probably need to revisit
960 * in future.
961 */
962 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
963 dcdc->desc.name = dcdc->name;
964 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
965 dcdc->desc.ops = &wm831x_epe_ops;
966 dcdc->desc.type = REGULATOR_VOLTAGE;
967 dcdc->desc.owner = THIS_MODULE;
968
969 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
970 pdata->epe[id], dcdc);
971 if (IS_ERR(dcdc->regulator)) {
972 ret = PTR_ERR(dcdc->regulator);
973 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
974 id + 1, ret);
975 goto err;
976 }
977
978 platform_set_drvdata(pdev, dcdc);
979
980 return 0;
981
982 err:
983 kfree(dcdc);
984 return ret;
985 }
986
987 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
988 {
989 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
990
991 platform_set_drvdata(pdev, NULL);
992
993 regulator_unregister(dcdc->regulator);
994 kfree(dcdc);
995
996 return 0;
997 }
998
999 static struct platform_driver wm831x_epe_driver = {
1000 .probe = wm831x_epe_probe,
1001 .remove = __devexit_p(wm831x_epe_remove),
1002 .driver = {
1003 .name = "wm831x-epe",
1004 .owner = THIS_MODULE,
1005 },
1006 };
1007
1008 static int __init wm831x_dcdc_init(void)
1009 {
1010 int ret;
1011 ret = platform_driver_register(&wm831x_buckv_driver);
1012 if (ret != 0)
1013 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1014
1015 ret = platform_driver_register(&wm831x_buckp_driver);
1016 if (ret != 0)
1017 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1018
1019 ret = platform_driver_register(&wm831x_boostp_driver);
1020 if (ret != 0)
1021 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1022
1023 ret = platform_driver_register(&wm831x_epe_driver);
1024 if (ret != 0)
1025 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1026
1027 return 0;
1028 }
1029 subsys_initcall(wm831x_dcdc_init);
1030
1031 static void __exit wm831x_dcdc_exit(void)
1032 {
1033 platform_driver_unregister(&wm831x_epe_driver);
1034 platform_driver_unregister(&wm831x_boostp_driver);
1035 platform_driver_unregister(&wm831x_buckp_driver);
1036 platform_driver_unregister(&wm831x_buckv_driver);
1037 }
1038 module_exit(wm831x_dcdc_exit);
1039
1040 /* Module information */
1041 MODULE_AUTHOR("Mark Brown");
1042 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1043 MODULE_LICENSE("GPL");
1044 MODULE_ALIAS("platform:wm831x-buckv");
1045 MODULE_ALIAS("platform:wm831x-buckp");