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This client driver allows you to use a GPIO pin as a source for PPS
[linux-2.6/next.git] / drivers / regulator / wm831x-dcdc.c
blobbd3531d8b2ac9364fb48c182c4947a00696d7c34
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 #include <linux/slab.h>
25
26 #include <linux/mfd/wm831x/core.h>
27 #include <linux/mfd/wm831x/regulator.h>
28 #include <linux/mfd/wm831x/pdata.h>
29
30 #define WM831X_BUCKV_MAX_SELECTOR 0x68
31 #define WM831X_BUCKP_MAX_SELECTOR 0x66
32
33 #define WM831X_DCDC_MODE_FAST 0
34 #define WM831X_DCDC_MODE_NORMAL 1
35 #define WM831X_DCDC_MODE_IDLE 2
36 #define WM831X_DCDC_MODE_STANDBY 3
37
38 #define WM831X_DCDC_MAX_NAME 6
39
40 /* Register offsets in control block */
41 #define WM831X_DCDC_CONTROL_1 0
42 #define WM831X_DCDC_CONTROL_2 1
43 #define WM831X_DCDC_ON_CONFIG 2
44 #define WM831X_DCDC_SLEEP_CONTROL 3
45 #define WM831X_DCDC_DVS_CONTROL 4
46
47 /*
48 * Shared
49 */
50
51 struct wm831x_dcdc {
52 char name[WM831X_DCDC_MAX_NAME];
53 struct regulator_desc desc;
54 int base;
55 struct wm831x *wm831x;
56 struct regulator_dev *regulator;
57 int dvs_gpio;
58 int dvs_gpio_state;
59 int on_vsel;
60 int dvs_vsel;
61 };
62
63 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
64 {
65 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
66 struct wm831x *wm831x = dcdc->wm831x;
67 int mask = 1 << rdev_get_id(rdev);
68 int reg;
69
70 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
71 if (reg < 0)
72 return reg;
73
74 if (reg & mask)
75 return 1;
76 else
77 return 0;
78 }
79
80 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
81 {
82 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
83 struct wm831x *wm831x = dcdc->wm831x;
84 int mask = 1 << rdev_get_id(rdev);
85
86 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
87 }
88
89 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
90 {
91 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
92 struct wm831x *wm831x = dcdc->wm831x;
93 int mask = 1 << rdev_get_id(rdev);
94
95 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
96 }
97
98 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
99
100 {
101 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
102 struct wm831x *wm831x = dcdc->wm831x;
103 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
104 int val;
105
106 val = wm831x_reg_read(wm831x, reg);
107 if (val < 0)
108 return val;
109
110 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
111
112 switch (val) {
113 case WM831X_DCDC_MODE_FAST:
114 return REGULATOR_MODE_FAST;
115 case WM831X_DCDC_MODE_NORMAL:
116 return REGULATOR_MODE_NORMAL;
117 case WM831X_DCDC_MODE_STANDBY:
118 return REGULATOR_MODE_STANDBY;
119 case WM831X_DCDC_MODE_IDLE:
120 return REGULATOR_MODE_IDLE;
121 default:
122 BUG();
123 return -EINVAL;
124 }
125 }
126
127 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
128 unsigned int mode)
129 {
130 int val;
131
132 switch (mode) {
133 case REGULATOR_MODE_FAST:
134 val = WM831X_DCDC_MODE_FAST;
135 break;
136 case REGULATOR_MODE_NORMAL:
137 val = WM831X_DCDC_MODE_NORMAL;
138 break;
139 case REGULATOR_MODE_STANDBY:
140 val = WM831X_DCDC_MODE_STANDBY;
141 break;
142 case REGULATOR_MODE_IDLE:
143 val = WM831X_DCDC_MODE_IDLE;
144 break;
145 default:
146 return -EINVAL;
147 }
148
149 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
150 val << WM831X_DC1_ON_MODE_SHIFT);
151 }
152
153 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
154 {
155 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
156 struct wm831x *wm831x = dcdc->wm831x;
157 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
158
159 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
160 }
161
162 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
163 unsigned int mode)
164 {
165 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
166 struct wm831x *wm831x = dcdc->wm831x;
167 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
168
169 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
170 }
171
172 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
173 {
174 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
175 struct wm831x *wm831x = dcdc->wm831x;
176 int ret;
177
178 /* First, check for errors */
179 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
180 if (ret < 0)
181 return ret;
182
183 if (ret & (1 << rdev_get_id(rdev))) {
184 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
185 rdev_get_id(rdev) + 1);
186 return REGULATOR_STATUS_ERROR;
187 }
188
189 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
190 if (rdev_get_id(rdev) < 2) {
191 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
192 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
193 rdev_get_id(rdev) + 1);
194 return REGULATOR_STATUS_ERROR;
195 }
196
197 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
198 dev_dbg(wm831x->dev, "DCDC%d over current\n",
199 rdev_get_id(rdev) + 1);
200 return REGULATOR_STATUS_ERROR;
201 }
202 }
203
204 /* Is the regulator on? */
205 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
206 if (ret < 0)
207 return ret;
208 if (!(ret & (1 << rdev_get_id(rdev))))
209 return REGULATOR_STATUS_OFF;
210
211 /* TODO: When we handle hardware control modes so we can report the
212 * current mode. */
213 return REGULATOR_STATUS_ON;
214 }
215
216 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
217 {
218 struct wm831x_dcdc *dcdc = data;
219
220 regulator_notifier_call_chain(dcdc->regulator,
221 REGULATOR_EVENT_UNDER_VOLTAGE,
222 NULL);
223
224 return IRQ_HANDLED;
225 }
226
227 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
228 {
229 struct wm831x_dcdc *dcdc = data;
230
231 regulator_notifier_call_chain(dcdc->regulator,
232 REGULATOR_EVENT_OVER_CURRENT,
233 NULL);
234
235 return IRQ_HANDLED;
236 }
237
238 /*
239 * BUCKV specifics
240 */
241
242 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
243 unsigned selector)
244 {
245 if (selector <= 0x8)
246 return 600000;
247 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
248 return 600000 + ((selector - 0x8) * 12500);
249 return -EINVAL;
250 }
251
252 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
253 int min_uV, int max_uV)
254 {
255 u16 vsel;
256
257 if (min_uV < 600000)
258 vsel = 0;
259 else if (min_uV <= 1800000)
260 vsel = ((min_uV - 600000) / 12500) + 8;
261 else
262 return -EINVAL;
263
264 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
265 return -EINVAL;
266
267 return vsel;
268 }
269
270 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
271 {
272 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
273
274 if (state == dcdc->dvs_gpio_state)
275 return 0;
276
277 dcdc->dvs_gpio_state = state;
278 gpio_set_value(dcdc->dvs_gpio, state);
279
280 /* Should wait for DVS state change to be asserted if we have
281 * a GPIO for it, for now assume the device is configured
282 * for the fastest possible transition.
283 */
284
285 return 0;
286 }
287
288 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
289 int min_uV, int max_uV, unsigned *selector)
290 {
291 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
292 struct wm831x *wm831x = dcdc->wm831x;
293 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
294 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
295 int vsel, ret;
296
297 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
298 if (vsel < 0)
299 return vsel;
300
301 *selector = vsel;
302
303 /* If this value is already set then do a GPIO update if we can */
304 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
305 return wm831x_buckv_set_dvs(rdev, 0);
306
307 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
308 return wm831x_buckv_set_dvs(rdev, 1);
309
310 /* Always set the ON status to the minimum voltage */
311 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
312 if (ret < 0)
313 return ret;
314 dcdc->on_vsel = vsel;
315
316 if (!dcdc->dvs_gpio)
317 return ret;
318
319 /* Kick the voltage transition now */
320 ret = wm831x_buckv_set_dvs(rdev, 0);
321 if (ret < 0)
322 return ret;
323
324 /*
325 * If this VSEL is higher than the last one we've seen then
326 * remember it as the DVS VSEL. This is optimised for CPUfreq
327 * usage where we want to get to the highest voltage very
328 * quickly.
329 */
330 if (vsel > dcdc->dvs_vsel) {
331 ret = wm831x_set_bits(wm831x, dvs_reg,
332 WM831X_DC1_DVS_VSEL_MASK,
333 dcdc->dvs_vsel);
334 if (ret == 0)
335 dcdc->dvs_vsel = vsel;
336 else
337 dev_warn(wm831x->dev,
338 "Failed to set DCDC DVS VSEL: %d\n", ret);
339 }
340
341 return 0;
342 }
343
344 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
345 int uV)
346 {
347 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
348 struct wm831x *wm831x = dcdc->wm831x;
349 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
350 int vsel;
351
352 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
353 if (vsel < 0)
354 return vsel;
355
356 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
357 }
358
359 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
360 {
361 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
362
363 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
364 return dcdc->dvs_vsel;
365 else
366 return dcdc->on_vsel;
367 }
368
369 /* Current limit options */
370 static u16 wm831x_dcdc_ilim[] = {
371 125, 250, 375, 500, 625, 750, 875, 1000
372 };
373
374 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
375 int min_uA, int max_uA)
376 {
377 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
378 struct wm831x *wm831x = dcdc->wm831x;
379 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
380 int i;
381
382 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
383 if (max_uA <= wm831x_dcdc_ilim[i])
384 break;
385 }
386 if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
387 return -EINVAL;
388
389 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
390 }
391
392 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
393 {
394 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
395 struct wm831x *wm831x = dcdc->wm831x;
396 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
397 int val;
398
399 val = wm831x_reg_read(wm831x, reg);
400 if (val < 0)
401 return val;
402
403 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
404 }
405
406 static struct regulator_ops wm831x_buckv_ops = {
407 .set_voltage = wm831x_buckv_set_voltage,
408 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
409 .list_voltage = wm831x_buckv_list_voltage,
410 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
411 .set_current_limit = wm831x_buckv_set_current_limit,
412 .get_current_limit = wm831x_buckv_get_current_limit,
413
414 .is_enabled = wm831x_dcdc_is_enabled,
415 .enable = wm831x_dcdc_enable,
416 .disable = wm831x_dcdc_disable,
417 .get_status = wm831x_dcdc_get_status,
418 .get_mode = wm831x_dcdc_get_mode,
419 .set_mode = wm831x_dcdc_set_mode,
420 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
421 };
422
423 /*
424 * Set up DVS control. We just log errors since we can still run
425 * (with reduced performance) if we fail.
426 */
427 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
428 struct wm831x_buckv_pdata *pdata)
429 {
430 struct wm831x *wm831x = dcdc->wm831x;
431 int ret;
432 u16 ctrl;
433
434 if (!pdata || !pdata->dvs_gpio)
435 return;
436
437 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
438 if (ret < 0) {
439 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
440 dcdc->name, ret);
441 return;
442 }
443
444 /* gpiolib won't let us read the GPIO status so pick the higher
445 * of the two existing voltages so we take it as platform data.
446 */
447 dcdc->dvs_gpio_state = pdata->dvs_init_state;
448
449 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
450 if (ret < 0) {
451 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
452 dcdc->name, ret);
453 gpio_free(pdata->dvs_gpio);
454 return;
455 }
456
457 dcdc->dvs_gpio = pdata->dvs_gpio;
458
459 switch (pdata->dvs_control_src) {
460 case 1:
461 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
462 break;
463 case 2:
464 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
465 break;
466 default:
467 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
468 pdata->dvs_control_src, dcdc->name);
469 return;
470 }
471
472 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
473 * to make bootstrapping a bit smoother.
474 */
475 if (!dcdc->dvs_vsel) {
476 ret = wm831x_set_bits(wm831x,
477 dcdc->base + WM831X_DCDC_DVS_CONTROL,
478 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
479 if (ret == 0)
480 dcdc->dvs_vsel = dcdc->on_vsel;
481 else
482 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
483 ret);
484 }
485
486 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
487 WM831X_DC1_DVS_SRC_MASK, ctrl);
488 if (ret < 0) {
489 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
490 dcdc->name, ret);
491 }
492 }
493
494 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
495 {
496 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
497 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
498 int id;
499 struct wm831x_dcdc *dcdc;
500 struct resource *res;
501 int ret, irq;
502
503 if (pdata && pdata->wm831x_num)
504 id = (pdata->wm831x_num * 10) + 1;
505 else
506 id = 0;
507 id = pdev->id - id;
508
509 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
510
511 if (pdata == NULL || pdata->dcdc[id] == NULL)
512 return -ENODEV;
513
514 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
515 if (dcdc == NULL) {
516 dev_err(&pdev->dev, "Unable to allocate private data\n");
517 return -ENOMEM;
518 }
519
520 dcdc->wm831x = wm831x;
521
522 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
523 if (res == NULL) {
524 dev_err(&pdev->dev, "No I/O resource\n");
525 ret = -EINVAL;
526 goto err;
527 }
528 dcdc->base = res->start;
529
530 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
531 dcdc->desc.name = dcdc->name;
532 dcdc->desc.id = id;
533 dcdc->desc.type = REGULATOR_VOLTAGE;
534 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
535 dcdc->desc.ops = &wm831x_buckv_ops;
536 dcdc->desc.owner = THIS_MODULE;
537
538 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
539 if (ret < 0) {
540 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
541 goto err;
542 }
543 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
544
545 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
546 if (ret < 0) {
547 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
548 goto err;
549 }
550 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
551
552 if (pdata->dcdc[id])
553 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
554
555 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
556 pdata->dcdc[id], dcdc);
557 if (IS_ERR(dcdc->regulator)) {
558 ret = PTR_ERR(dcdc->regulator);
559 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
560 id + 1, ret);
561 goto err;
562 }
563
564 irq = platform_get_irq_byname(pdev, "UV");
565 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
566 IRQF_TRIGGER_RISING, dcdc->name, 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 = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
575 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
576 if (ret != 0) {
577 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
578 irq, ret);
579 goto err_uv;
580 }
581
582 platform_set_drvdata(pdev, dcdc);
583
584 return 0;
585
586 err_uv:
587 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
588 err_regulator:
589 regulator_unregister(dcdc->regulator);
590 err:
591 if (dcdc->dvs_gpio)
592 gpio_free(dcdc->dvs_gpio);
593 kfree(dcdc);
594 return ret;
595 }
596
597 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
598 {
599 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
600
601 platform_set_drvdata(pdev, NULL);
602
603 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
604 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
605 regulator_unregister(dcdc->regulator);
606 if (dcdc->dvs_gpio)
607 gpio_free(dcdc->dvs_gpio);
608 kfree(dcdc);
609
610 return 0;
611 }
612
613 static struct platform_driver wm831x_buckv_driver = {
614 .probe = wm831x_buckv_probe,
615 .remove = __devexit_p(wm831x_buckv_remove),
616 .driver = {
617 .name = "wm831x-buckv",
618 .owner = THIS_MODULE,
619 },
620 };
621
622 /*
623 * BUCKP specifics
624 */
625
626 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
627 unsigned selector)
628 {
629 if (selector <= WM831X_BUCKP_MAX_SELECTOR)
630 return 850000 + (selector * 25000);
631 else
632 return -EINVAL;
633 }
634
635 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
636 int min_uV, int max_uV, int *selector)
637 {
638 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
639 struct wm831x *wm831x = dcdc->wm831x;
640 u16 vsel;
641
642 if (min_uV <= 34000000)
643 vsel = (min_uV - 850000) / 25000;
644 else
645 return -EINVAL;
646
647 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
648 return -EINVAL;
649
650 *selector = vsel;
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 unsigned *selector)
658 {
659 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
660 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
661
662 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
663 selector);
664 }
665
666 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
667 int uV)
668 {
669 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
670 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
671 unsigned selector;
672
673 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
674 }
675
676 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
677 {
678 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
679 struct wm831x *wm831x = dcdc->wm831x;
680 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
681 int val;
682
683 val = wm831x_reg_read(wm831x, reg);
684 if (val < 0)
685 return val;
686
687 return val & WM831X_DC3_ON_VSEL_MASK;
688 }
689
690 static struct regulator_ops wm831x_buckp_ops = {
691 .set_voltage = wm831x_buckp_set_voltage,
692 .get_voltage_sel = wm831x_buckp_get_voltage_sel,
693 .list_voltage = wm831x_buckp_list_voltage,
694 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
695
696 .is_enabled = wm831x_dcdc_is_enabled,
697 .enable = wm831x_dcdc_enable,
698 .disable = wm831x_dcdc_disable,
699 .get_status = wm831x_dcdc_get_status,
700 .get_mode = wm831x_dcdc_get_mode,
701 .set_mode = wm831x_dcdc_set_mode,
702 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
703 };
704
705 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
706 {
707 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
708 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
709 int id;
710 struct wm831x_dcdc *dcdc;
711 struct resource *res;
712 int ret, irq;
713
714 if (pdata && pdata->wm831x_num)
715 id = (pdata->wm831x_num * 10) + 1;
716 else
717 id = 0;
718 id = pdev->id - id;
719
720 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
721
722 if (pdata == NULL || pdata->dcdc[id] == NULL)
723 return -ENODEV;
724
725 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
726 if (dcdc == NULL) {
727 dev_err(&pdev->dev, "Unable to allocate private data\n");
728 return -ENOMEM;
729 }
730
731 dcdc->wm831x = wm831x;
732
733 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
734 if (res == NULL) {
735 dev_err(&pdev->dev, "No I/O resource\n");
736 ret = -EINVAL;
737 goto err;
738 }
739 dcdc->base = res->start;
740
741 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
742 dcdc->desc.name = dcdc->name;
743 dcdc->desc.id = id;
744 dcdc->desc.type = REGULATOR_VOLTAGE;
745 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
746 dcdc->desc.ops = &wm831x_buckp_ops;
747 dcdc->desc.owner = THIS_MODULE;
748
749 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
750 pdata->dcdc[id], dcdc);
751 if (IS_ERR(dcdc->regulator)) {
752 ret = PTR_ERR(dcdc->regulator);
753 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
754 id + 1, ret);
755 goto err;
756 }
757
758 irq = platform_get_irq_byname(pdev, "UV");
759 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
760 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
761 if (ret != 0) {
762 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
763 irq, ret);
764 goto err_regulator;
765 }
766
767 platform_set_drvdata(pdev, dcdc);
768
769 return 0;
770
771 err_regulator:
772 regulator_unregister(dcdc->regulator);
773 err:
774 kfree(dcdc);
775 return ret;
776 }
777
778 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
779 {
780 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
781
782 platform_set_drvdata(pdev, NULL);
783
784 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
785 regulator_unregister(dcdc->regulator);
786 kfree(dcdc);
787
788 return 0;
789 }
790
791 static struct platform_driver wm831x_buckp_driver = {
792 .probe = wm831x_buckp_probe,
793 .remove = __devexit_p(wm831x_buckp_remove),
794 .driver = {
795 .name = "wm831x-buckp",
796 .owner = THIS_MODULE,
797 },
798 };
799
800 /*
801 * DCDC boost convertors
802 */
803
804 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
805 {
806 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
807 struct wm831x *wm831x = dcdc->wm831x;
808 int ret;
809
810 /* First, check for errors */
811 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
812 if (ret < 0)
813 return ret;
814
815 if (ret & (1 << rdev_get_id(rdev))) {
816 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
817 rdev_get_id(rdev) + 1);
818 return REGULATOR_STATUS_ERROR;
819 }
820
821 /* Is the regulator on? */
822 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
823 if (ret < 0)
824 return ret;
825 if (ret & (1 << rdev_get_id(rdev)))
826 return REGULATOR_STATUS_ON;
827 else
828 return REGULATOR_STATUS_OFF;
829 }
830
831 static struct regulator_ops wm831x_boostp_ops = {
832 .get_status = wm831x_boostp_get_status,
833
834 .is_enabled = wm831x_dcdc_is_enabled,
835 .enable = wm831x_dcdc_enable,
836 .disable = wm831x_dcdc_disable,
837 };
838
839 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
840 {
841 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
842 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
843 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
844 struct wm831x_dcdc *dcdc;
845 struct resource *res;
846 int ret, irq;
847
848 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
849
850 if (pdata == NULL || pdata->dcdc[id] == NULL)
851 return -ENODEV;
852
853 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
854 if (dcdc == NULL) {
855 dev_err(&pdev->dev, "Unable to allocate private data\n");
856 return -ENOMEM;
857 }
858
859 dcdc->wm831x = wm831x;
860
861 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
862 if (res == NULL) {
863 dev_err(&pdev->dev, "No I/O resource\n");
864 ret = -EINVAL;
865 goto err;
866 }
867 dcdc->base = res->start;
868
869 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
870 dcdc->desc.name = dcdc->name;
871 dcdc->desc.id = id;
872 dcdc->desc.type = REGULATOR_VOLTAGE;
873 dcdc->desc.ops = &wm831x_boostp_ops;
874 dcdc->desc.owner = THIS_MODULE;
875
876 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
877 pdata->dcdc[id], dcdc);
878 if (IS_ERR(dcdc->regulator)) {
879 ret = PTR_ERR(dcdc->regulator);
880 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
881 id + 1, ret);
882 goto err;
883 }
884
885 irq = platform_get_irq_byname(pdev, "UV");
886 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
887 IRQF_TRIGGER_RISING, dcdc->name,
888 dcdc);
889 if (ret != 0) {
890 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
891 irq, ret);
892 goto err_regulator;
893 }
894
895 platform_set_drvdata(pdev, dcdc);
896
897 return 0;
898
899 err_regulator:
900 regulator_unregister(dcdc->regulator);
901 err:
902 kfree(dcdc);
903 return ret;
904 }
905
906 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
907 {
908 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
909
910 platform_set_drvdata(pdev, NULL);
911
912 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
913 regulator_unregister(dcdc->regulator);
914 kfree(dcdc);
915
916 return 0;
917 }
918
919 static struct platform_driver wm831x_boostp_driver = {
920 .probe = wm831x_boostp_probe,
921 .remove = __devexit_p(wm831x_boostp_remove),
922 .driver = {
923 .name = "wm831x-boostp",
924 .owner = THIS_MODULE,
925 },
926 };
927
928 /*
929 * External Power Enable
930 *
931 * These aren't actually DCDCs but look like them in hardware so share
932 * code.
933 */
934
935 #define WM831X_EPE_BASE 6
936
937 static struct regulator_ops wm831x_epe_ops = {
938 .is_enabled = wm831x_dcdc_is_enabled,
939 .enable = wm831x_dcdc_enable,
940 .disable = wm831x_dcdc_disable,
941 .get_status = wm831x_dcdc_get_status,
942 };
943
944 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
945 {
946 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
947 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
948 int id = pdev->id % ARRAY_SIZE(pdata->epe);
949 struct wm831x_dcdc *dcdc;
950 int ret;
951
952 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
953
954 if (pdata == NULL || pdata->epe[id] == NULL)
955 return -ENODEV;
956
957 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
958 if (dcdc == NULL) {
959 dev_err(&pdev->dev, "Unable to allocate private data\n");
960 return -ENOMEM;
961 }
962
963 dcdc->wm831x = wm831x;
964
965 /* For current parts this is correct; probably need to revisit
966 * in future.
967 */
968 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
969 dcdc->desc.name = dcdc->name;
970 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
971 dcdc->desc.ops = &wm831x_epe_ops;
972 dcdc->desc.type = REGULATOR_VOLTAGE;
973 dcdc->desc.owner = THIS_MODULE;
974
975 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
976 pdata->epe[id], dcdc);
977 if (IS_ERR(dcdc->regulator)) {
978 ret = PTR_ERR(dcdc->regulator);
979 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
980 id + 1, ret);
981 goto err;
982 }
983
984 platform_set_drvdata(pdev, dcdc);
985
986 return 0;
987
988 err:
989 kfree(dcdc);
990 return ret;
991 }
992
993 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
994 {
995 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
996
997 platform_set_drvdata(pdev, NULL);
998
999 regulator_unregister(dcdc->regulator);
1000 kfree(dcdc);
1001
1002 return 0;
1003 }
1004
1005 static struct platform_driver wm831x_epe_driver = {
1006 .probe = wm831x_epe_probe,
1007 .remove = __devexit_p(wm831x_epe_remove),
1008 .driver = {
1009 .name = "wm831x-epe",
1010 .owner = THIS_MODULE,
1011 },
1012 };
1013
1014 static int __init wm831x_dcdc_init(void)
1015 {
1016 int ret;
1017 ret = platform_driver_register(&wm831x_buckv_driver);
1018 if (ret != 0)
1019 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1020
1021 ret = platform_driver_register(&wm831x_buckp_driver);
1022 if (ret != 0)
1023 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1024
1025 ret = platform_driver_register(&wm831x_boostp_driver);
1026 if (ret != 0)
1027 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1028
1029 ret = platform_driver_register(&wm831x_epe_driver);
1030 if (ret != 0)
1031 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1032
1033 return 0;
1034 }
1035 subsys_initcall(wm831x_dcdc_init);
1036
1037 static void __exit wm831x_dcdc_exit(void)
1038 {
1039 platform_driver_unregister(&wm831x_epe_driver);
1040 platform_driver_unregister(&wm831x_boostp_driver);
1041 platform_driver_unregister(&wm831x_buckp_driver);
1042 platform_driver_unregister(&wm831x_buckv_driver);
1043 }
1044 module_exit(wm831x_dcdc_exit);
1045
1046 /* Module information */
1047 MODULE_AUTHOR("Mark Brown");
1048 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1049 MODULE_LICENSE("GPL");
1050 MODULE_ALIAS("platform:wm831x-buckv");
1051 MODULE_ALIAS("platform:wm831x-buckp");
1052 MODULE_ALIAS("platform:wm831x-epe");
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