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Linux 3.6-rc6
[linux/fpc-iii.git] / drivers / regulator / wm831x-dcdc.c
blob7413885be01ba5907117c4c95d89df1a4129924b
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 9
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 char supply_name[WM831X_DCDC_MAX_NAME];
54 struct regulator_desc desc;
55 int base;
56 struct wm831x *wm831x;
57 struct regulator_dev *regulator;
58 int dvs_gpio;
59 int dvs_gpio_state;
60 int on_vsel;
61 int dvs_vsel;
62 };
63
64 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
65
66 {
67 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
68 struct wm831x *wm831x = dcdc->wm831x;
69 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
70 int val;
71
72 val = wm831x_reg_read(wm831x, reg);
73 if (val < 0)
74 return val;
75
76 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
77
78 switch (val) {
79 case WM831X_DCDC_MODE_FAST:
80 return REGULATOR_MODE_FAST;
81 case WM831X_DCDC_MODE_NORMAL:
82 return REGULATOR_MODE_NORMAL;
83 case WM831X_DCDC_MODE_STANDBY:
84 return REGULATOR_MODE_STANDBY;
85 case WM831X_DCDC_MODE_IDLE:
86 return REGULATOR_MODE_IDLE;
87 default:
88 BUG();
89 return -EINVAL;
90 }
91 }
92
93 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
94 unsigned int mode)
95 {
96 int val;
97
98 switch (mode) {
99 case REGULATOR_MODE_FAST:
100 val = WM831X_DCDC_MODE_FAST;
101 break;
102 case REGULATOR_MODE_NORMAL:
103 val = WM831X_DCDC_MODE_NORMAL;
104 break;
105 case REGULATOR_MODE_STANDBY:
106 val = WM831X_DCDC_MODE_STANDBY;
107 break;
108 case REGULATOR_MODE_IDLE:
109 val = WM831X_DCDC_MODE_IDLE;
110 break;
111 default:
112 return -EINVAL;
113 }
114
115 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
116 val << WM831X_DC1_ON_MODE_SHIFT);
117 }
118
119 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
120 {
121 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
122 struct wm831x *wm831x = dcdc->wm831x;
123 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
124
125 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
126 }
127
128 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
129 unsigned int mode)
130 {
131 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
132 struct wm831x *wm831x = dcdc->wm831x;
133 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
134
135 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
136 }
137
138 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
139 {
140 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
141 struct wm831x *wm831x = dcdc->wm831x;
142 int ret;
143
144 /* First, check for errors */
145 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
146 if (ret < 0)
147 return ret;
148
149 if (ret & (1 << rdev_get_id(rdev))) {
150 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
151 rdev_get_id(rdev) + 1);
152 return REGULATOR_STATUS_ERROR;
153 }
154
155 /* DCDC1 and DCDC2 can additionally detect high voltage/current */
156 if (rdev_get_id(rdev) < 2) {
157 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
158 dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
159 rdev_get_id(rdev) + 1);
160 return REGULATOR_STATUS_ERROR;
161 }
162
163 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
164 dev_dbg(wm831x->dev, "DCDC%d over current\n",
165 rdev_get_id(rdev) + 1);
166 return REGULATOR_STATUS_ERROR;
167 }
168 }
169
170 /* Is the regulator on? */
171 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
172 if (ret < 0)
173 return ret;
174 if (!(ret & (1 << rdev_get_id(rdev))))
175 return REGULATOR_STATUS_OFF;
176
177 /* TODO: When we handle hardware control modes so we can report the
178 * current mode. */
179 return REGULATOR_STATUS_ON;
180 }
181
182 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
183 {
184 struct wm831x_dcdc *dcdc = data;
185
186 regulator_notifier_call_chain(dcdc->regulator,
187 REGULATOR_EVENT_UNDER_VOLTAGE,
188 NULL);
189
190 return IRQ_HANDLED;
191 }
192
193 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
194 {
195 struct wm831x_dcdc *dcdc = data;
196
197 regulator_notifier_call_chain(dcdc->regulator,
198 REGULATOR_EVENT_OVER_CURRENT,
199 NULL);
200
201 return IRQ_HANDLED;
202 }
203
204 /*
205 * BUCKV specifics
206 */
207
208 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
209 unsigned selector)
210 {
211 if (selector <= 0x8)
212 return 600000;
213 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
214 return 600000 + ((selector - 0x8) * 12500);
215 return -EINVAL;
216 }
217
218 static int wm831x_buckv_map_voltage(struct regulator_dev *rdev,
219 int min_uV, int max_uV)
220 {
221 u16 vsel;
222
223 if (min_uV < 600000)
224 vsel = 0;
225 else if (min_uV <= 1800000)
226 vsel = ((min_uV - 600000) / 12500) + 8;
227 else
228 return -EINVAL;
229
230 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
231 return -EINVAL;
232
233 return vsel;
234 }
235
236 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
237 {
238 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
239
240 if (state == dcdc->dvs_gpio_state)
241 return 0;
242
243 dcdc->dvs_gpio_state = state;
244 gpio_set_value(dcdc->dvs_gpio, state);
245
246 /* Should wait for DVS state change to be asserted if we have
247 * a GPIO for it, for now assume the device is configured
248 * for the fastest possible transition.
249 */
250
251 return 0;
252 }
253
254 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
255 unsigned vsel)
256 {
257 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
258 struct wm831x *wm831x = dcdc->wm831x;
259 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
260 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
261 int ret;
262
263 /* If this value is already set then do a GPIO update if we can */
264 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
265 return wm831x_buckv_set_dvs(rdev, 0);
266
267 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
268 return wm831x_buckv_set_dvs(rdev, 1);
269
270 /* Always set the ON status to the minimum voltage */
271 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
272 if (ret < 0)
273 return ret;
274 dcdc->on_vsel = vsel;
275
276 if (!dcdc->dvs_gpio)
277 return ret;
278
279 /* Kick the voltage transition now */
280 ret = wm831x_buckv_set_dvs(rdev, 0);
281 if (ret < 0)
282 return ret;
283
284 /*
285 * If this VSEL is higher than the last one we've seen then
286 * remember it as the DVS VSEL. This is optimised for CPUfreq
287 * usage where we want to get to the highest voltage very
288 * quickly.
289 */
290 if (vsel > dcdc->dvs_vsel) {
291 ret = wm831x_set_bits(wm831x, dvs_reg,
292 WM831X_DC1_DVS_VSEL_MASK,
293 dcdc->dvs_vsel);
294 if (ret == 0)
295 dcdc->dvs_vsel = vsel;
296 else
297 dev_warn(wm831x->dev,
298 "Failed to set DCDC DVS VSEL: %d\n", ret);
299 }
300
301 return 0;
302 }
303
304 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
305 int uV)
306 {
307 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
308 struct wm831x *wm831x = dcdc->wm831x;
309 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
310 int vsel;
311
312 vsel = wm831x_buckv_map_voltage(rdev, uV, uV);
313 if (vsel < 0)
314 return vsel;
315
316 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
317 }
318
319 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
320 {
321 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
322
323 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
324 return dcdc->dvs_vsel;
325 else
326 return dcdc->on_vsel;
327 }
328
329 /* Current limit options */
330 static u16 wm831x_dcdc_ilim[] = {
331 125, 250, 375, 500, 625, 750, 875, 1000
332 };
333
334 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
335 int min_uA, int max_uA)
336 {
337 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
338 struct wm831x *wm831x = dcdc->wm831x;
339 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
340 int i;
341
342 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
343 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
344 (wm831x_dcdc_ilim[i] <= max_uA))
345 break;
346 }
347 if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
348 return -EINVAL;
349
350 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK,
351 i << WM831X_DC1_HC_THR_SHIFT);
352 }
353
354 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
355 {
356 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
357 struct wm831x *wm831x = dcdc->wm831x;
358 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
359 int val;
360
361 val = wm831x_reg_read(wm831x, reg);
362 if (val < 0)
363 return val;
364
365 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
366 return wm831x_dcdc_ilim[val];
367 }
368
369 static struct regulator_ops wm831x_buckv_ops = {
370 .set_voltage_sel = wm831x_buckv_set_voltage_sel,
371 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
372 .list_voltage = wm831x_buckv_list_voltage,
373 .map_voltage = wm831x_buckv_map_voltage,
374 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
375 .set_current_limit = wm831x_buckv_set_current_limit,
376 .get_current_limit = wm831x_buckv_get_current_limit,
377
378 .is_enabled = regulator_is_enabled_regmap,
379 .enable = regulator_enable_regmap,
380 .disable = regulator_disable_regmap,
381 .get_status = wm831x_dcdc_get_status,
382 .get_mode = wm831x_dcdc_get_mode,
383 .set_mode = wm831x_dcdc_set_mode,
384 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
385 };
386
387 /*
388 * Set up DVS control. We just log errors since we can still run
389 * (with reduced performance) if we fail.
390 */
391 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
392 struct wm831x_buckv_pdata *pdata)
393 {
394 struct wm831x *wm831x = dcdc->wm831x;
395 int ret;
396 u16 ctrl;
397
398 if (!pdata || !pdata->dvs_gpio)
399 return;
400
401 /* gpiolib won't let us read the GPIO status so pick the higher
402 * of the two existing voltages so we take it as platform data.
403 */
404 dcdc->dvs_gpio_state = pdata->dvs_init_state;
405
406 ret = gpio_request_one(pdata->dvs_gpio,
407 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
408 "DCDC DVS");
409 if (ret < 0) {
410 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
411 dcdc->name, ret);
412 return;
413 }
414
415 dcdc->dvs_gpio = pdata->dvs_gpio;
416
417 switch (pdata->dvs_control_src) {
418 case 1:
419 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
420 break;
421 case 2:
422 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
423 break;
424 default:
425 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
426 pdata->dvs_control_src, dcdc->name);
427 return;
428 }
429
430 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
431 * to make bootstrapping a bit smoother.
432 */
433 if (!dcdc->dvs_vsel) {
434 ret = wm831x_set_bits(wm831x,
435 dcdc->base + WM831X_DCDC_DVS_CONTROL,
436 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
437 if (ret == 0)
438 dcdc->dvs_vsel = dcdc->on_vsel;
439 else
440 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
441 ret);
442 }
443
444 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
445 WM831X_DC1_DVS_SRC_MASK, ctrl);
446 if (ret < 0) {
447 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
448 dcdc->name, ret);
449 }
450 }
451
452 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
453 {
454 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
455 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
456 struct regulator_config config = { };
457 int id;
458 struct wm831x_dcdc *dcdc;
459 struct resource *res;
460 int ret, irq;
461
462 if (pdata && pdata->wm831x_num)
463 id = (pdata->wm831x_num * 10) + 1;
464 else
465 id = 0;
466 id = pdev->id - id;
467
468 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
469
470 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
471 GFP_KERNEL);
472 if (dcdc == NULL) {
473 dev_err(&pdev->dev, "Unable to allocate private data\n");
474 return -ENOMEM;
475 }
476
477 dcdc->wm831x = wm831x;
478
479 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
480 if (res == NULL) {
481 dev_err(&pdev->dev, "No I/O resource\n");
482 ret = -EINVAL;
483 goto err;
484 }
485 dcdc->base = res->start;
486
487 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
488 dcdc->desc.name = dcdc->name;
489
490 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
491 "DC%dVDD", id + 1);
492 dcdc->desc.supply_name = dcdc->supply_name;
493
494 dcdc->desc.id = id;
495 dcdc->desc.type = REGULATOR_VOLTAGE;
496 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
497 dcdc->desc.ops = &wm831x_buckv_ops;
498 dcdc->desc.owner = THIS_MODULE;
499 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
500 dcdc->desc.enable_mask = 1 << id;
501
502 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
503 if (ret < 0) {
504 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
505 goto err;
506 }
507 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
508
509 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
510 if (ret < 0) {
511 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
512 goto err;
513 }
514 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
515
516 if (pdata && pdata->dcdc[id])
517 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
518
519 config.dev = pdev->dev.parent;
520 if (pdata)
521 config.init_data = pdata->dcdc[id];
522 config.driver_data = dcdc;
523 config.regmap = wm831x->regmap;
524
525 dcdc->regulator = regulator_register(&dcdc->desc, &config);
526 if (IS_ERR(dcdc->regulator)) {
527 ret = PTR_ERR(dcdc->regulator);
528 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
529 id + 1, ret);
530 goto err;
531 }
532
533 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
534 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
535 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
536 if (ret != 0) {
537 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
538 irq, ret);
539 goto err_regulator;
540 }
541
542 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
543 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
544 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
545 if (ret != 0) {
546 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
547 irq, ret);
548 goto err_uv;
549 }
550
551 platform_set_drvdata(pdev, dcdc);
552
553 return 0;
554
555 err_uv:
556 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
557 dcdc);
558 err_regulator:
559 regulator_unregister(dcdc->regulator);
560 err:
561 if (dcdc->dvs_gpio)
562 gpio_free(dcdc->dvs_gpio);
563 return ret;
564 }
565
566 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
567 {
568 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
569 struct wm831x *wm831x = dcdc->wm831x;
570
571 platform_set_drvdata(pdev, NULL);
572
573 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")),
574 dcdc);
575 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
576 dcdc);
577 regulator_unregister(dcdc->regulator);
578 if (dcdc->dvs_gpio)
579 gpio_free(dcdc->dvs_gpio);
580
581 return 0;
582 }
583
584 static struct platform_driver wm831x_buckv_driver = {
585 .probe = wm831x_buckv_probe,
586 .remove = __devexit_p(wm831x_buckv_remove),
587 .driver = {
588 .name = "wm831x-buckv",
589 .owner = THIS_MODULE,
590 },
591 };
592
593 /*
594 * BUCKP specifics
595 */
596
597 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
598 {
599 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
600 struct wm831x *wm831x = dcdc->wm831x;
601 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
602 int sel;
603
604 sel = regulator_map_voltage_linear(rdev, uV, uV);
605 if (sel < 0)
606 return sel;
607
608 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
609 }
610
611 static struct regulator_ops wm831x_buckp_ops = {
612 .set_voltage_sel = regulator_set_voltage_sel_regmap,
613 .get_voltage_sel = regulator_get_voltage_sel_regmap,
614 .list_voltage = regulator_list_voltage_linear,
615 .map_voltage = regulator_map_voltage_linear,
616 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
617
618 .is_enabled = regulator_is_enabled_regmap,
619 .enable = regulator_enable_regmap,
620 .disable = regulator_disable_regmap,
621 .get_status = wm831x_dcdc_get_status,
622 .get_mode = wm831x_dcdc_get_mode,
623 .set_mode = wm831x_dcdc_set_mode,
624 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
625 };
626
627 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
628 {
629 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
630 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
631 struct regulator_config config = { };
632 int id;
633 struct wm831x_dcdc *dcdc;
634 struct resource *res;
635 int ret, irq;
636
637 if (pdata && pdata->wm831x_num)
638 id = (pdata->wm831x_num * 10) + 1;
639 else
640 id = 0;
641 id = pdev->id - id;
642
643 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
644
645 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
646 GFP_KERNEL);
647 if (dcdc == NULL) {
648 dev_err(&pdev->dev, "Unable to allocate private data\n");
649 return -ENOMEM;
650 }
651
652 dcdc->wm831x = wm831x;
653
654 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
655 if (res == NULL) {
656 dev_err(&pdev->dev, "No I/O resource\n");
657 ret = -EINVAL;
658 goto err;
659 }
660 dcdc->base = res->start;
661
662 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
663 dcdc->desc.name = dcdc->name;
664
665 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
666 "DC%dVDD", id + 1);
667 dcdc->desc.supply_name = dcdc->supply_name;
668
669 dcdc->desc.id = id;
670 dcdc->desc.type = REGULATOR_VOLTAGE;
671 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
672 dcdc->desc.ops = &wm831x_buckp_ops;
673 dcdc->desc.owner = THIS_MODULE;
674 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
675 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
676 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
677 dcdc->desc.enable_mask = 1 << id;
678 dcdc->desc.min_uV = 850000;
679 dcdc->desc.uV_step = 25000;
680
681 config.dev = pdev->dev.parent;
682 if (pdata)
683 config.init_data = pdata->dcdc[id];
684 config.driver_data = dcdc;
685 config.regmap = wm831x->regmap;
686
687 dcdc->regulator = regulator_register(&dcdc->desc, &config);
688 if (IS_ERR(dcdc->regulator)) {
689 ret = PTR_ERR(dcdc->regulator);
690 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
691 id + 1, ret);
692 goto err;
693 }
694
695 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
696 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
697 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
698 if (ret != 0) {
699 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
700 irq, ret);
701 goto err_regulator;
702 }
703
704 platform_set_drvdata(pdev, dcdc);
705
706 return 0;
707
708 err_regulator:
709 regulator_unregister(dcdc->regulator);
710 err:
711 return ret;
712 }
713
714 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
715 {
716 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
717
718 platform_set_drvdata(pdev, NULL);
719
720 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
721 dcdc);
722 regulator_unregister(dcdc->regulator);
723
724 return 0;
725 }
726
727 static struct platform_driver wm831x_buckp_driver = {
728 .probe = wm831x_buckp_probe,
729 .remove = __devexit_p(wm831x_buckp_remove),
730 .driver = {
731 .name = "wm831x-buckp",
732 .owner = THIS_MODULE,
733 },
734 };
735
736 /*
737 * DCDC boost convertors
738 */
739
740 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
741 {
742 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
743 struct wm831x *wm831x = dcdc->wm831x;
744 int ret;
745
746 /* First, check for errors */
747 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
748 if (ret < 0)
749 return ret;
750
751 if (ret & (1 << rdev_get_id(rdev))) {
752 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
753 rdev_get_id(rdev) + 1);
754 return REGULATOR_STATUS_ERROR;
755 }
756
757 /* Is the regulator on? */
758 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
759 if (ret < 0)
760 return ret;
761 if (ret & (1 << rdev_get_id(rdev)))
762 return REGULATOR_STATUS_ON;
763 else
764 return REGULATOR_STATUS_OFF;
765 }
766
767 static struct regulator_ops wm831x_boostp_ops = {
768 .get_status = wm831x_boostp_get_status,
769
770 .is_enabled = regulator_is_enabled_regmap,
771 .enable = regulator_enable_regmap,
772 .disable = regulator_disable_regmap,
773 };
774
775 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
776 {
777 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
778 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
779 struct regulator_config config = { };
780 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
781 struct wm831x_dcdc *dcdc;
782 struct resource *res;
783 int ret, irq;
784
785 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
786
787 if (pdata == NULL || pdata->dcdc[id] == NULL)
788 return -ENODEV;
789
790 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
791 if (dcdc == NULL) {
792 dev_err(&pdev->dev, "Unable to allocate private data\n");
793 return -ENOMEM;
794 }
795
796 dcdc->wm831x = wm831x;
797
798 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
799 if (res == NULL) {
800 dev_err(&pdev->dev, "No I/O resource\n");
801 ret = -EINVAL;
802 goto err;
803 }
804 dcdc->base = res->start;
805
806 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
807 dcdc->desc.name = dcdc->name;
808 dcdc->desc.id = id;
809 dcdc->desc.type = REGULATOR_VOLTAGE;
810 dcdc->desc.ops = &wm831x_boostp_ops;
811 dcdc->desc.owner = THIS_MODULE;
812 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
813 dcdc->desc.enable_mask = 1 << id;
814
815 config.dev = pdev->dev.parent;
816 if (pdata)
817 config.init_data = pdata->dcdc[id];
818 config.driver_data = dcdc;
819 config.regmap = wm831x->regmap;
820
821 dcdc->regulator = regulator_register(&dcdc->desc, &config);
822 if (IS_ERR(dcdc->regulator)) {
823 ret = PTR_ERR(dcdc->regulator);
824 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
825 id + 1, ret);
826 goto err;
827 }
828
829 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
830 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
831 IRQF_TRIGGER_RISING, dcdc->name,
832 dcdc);
833 if (ret != 0) {
834 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
835 irq, ret);
836 goto err_regulator;
837 }
838
839 platform_set_drvdata(pdev, dcdc);
840
841 return 0;
842
843 err_regulator:
844 regulator_unregister(dcdc->regulator);
845 err:
846 return ret;
847 }
848
849 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
850 {
851 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
852
853 platform_set_drvdata(pdev, NULL);
854
855 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
856 dcdc);
857 regulator_unregister(dcdc->regulator);
858
859 return 0;
860 }
861
862 static struct platform_driver wm831x_boostp_driver = {
863 .probe = wm831x_boostp_probe,
864 .remove = __devexit_p(wm831x_boostp_remove),
865 .driver = {
866 .name = "wm831x-boostp",
867 .owner = THIS_MODULE,
868 },
869 };
870
871 /*
872 * External Power Enable
873 *
874 * These aren't actually DCDCs but look like them in hardware so share
875 * code.
876 */
877
878 #define WM831X_EPE_BASE 6
879
880 static struct regulator_ops wm831x_epe_ops = {
881 .is_enabled = regulator_is_enabled_regmap,
882 .enable = regulator_enable_regmap,
883 .disable = regulator_disable_regmap,
884 .get_status = wm831x_dcdc_get_status,
885 };
886
887 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
888 {
889 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
890 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
891 struct regulator_config config = { };
892 int id = pdev->id % ARRAY_SIZE(pdata->epe);
893 struct wm831x_dcdc *dcdc;
894 int ret;
895
896 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
897
898 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
899 if (dcdc == NULL) {
900 dev_err(&pdev->dev, "Unable to allocate private data\n");
901 return -ENOMEM;
902 }
903
904 dcdc->wm831x = wm831x;
905
906 /* For current parts this is correct; probably need to revisit
907 * in future.
908 */
909 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
910 dcdc->desc.name = dcdc->name;
911 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
912 dcdc->desc.ops = &wm831x_epe_ops;
913 dcdc->desc.type = REGULATOR_VOLTAGE;
914 dcdc->desc.owner = THIS_MODULE;
915 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
916 dcdc->desc.enable_mask = 1 << dcdc->desc.id;
917
918 config.dev = pdev->dev.parent;
919 if (pdata)
920 config.init_data = pdata->epe[id];
921 config.driver_data = dcdc;
922 config.regmap = wm831x->regmap;
923
924 dcdc->regulator = regulator_register(&dcdc->desc, &config);
925 if (IS_ERR(dcdc->regulator)) {
926 ret = PTR_ERR(dcdc->regulator);
927 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
928 id + 1, ret);
929 goto err;
930 }
931
932 platform_set_drvdata(pdev, dcdc);
933
934 return 0;
935
936 err:
937 return ret;
938 }
939
940 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
941 {
942 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
943
944 platform_set_drvdata(pdev, NULL);
945 regulator_unregister(dcdc->regulator);
946
947 return 0;
948 }
949
950 static struct platform_driver wm831x_epe_driver = {
951 .probe = wm831x_epe_probe,
952 .remove = __devexit_p(wm831x_epe_remove),
953 .driver = {
954 .name = "wm831x-epe",
955 .owner = THIS_MODULE,
956 },
957 };
958
959 static int __init wm831x_dcdc_init(void)
960 {
961 int ret;
962 ret = platform_driver_register(&wm831x_buckv_driver);
963 if (ret != 0)
964 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
965
966 ret = platform_driver_register(&wm831x_buckp_driver);
967 if (ret != 0)
968 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
969
970 ret = platform_driver_register(&wm831x_boostp_driver);
971 if (ret != 0)
972 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
973
974 ret = platform_driver_register(&wm831x_epe_driver);
975 if (ret != 0)
976 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
977
978 return 0;
979 }
980 subsys_initcall(wm831x_dcdc_init);
981
982 static void __exit wm831x_dcdc_exit(void)
983 {
984 platform_driver_unregister(&wm831x_epe_driver);
985 platform_driver_unregister(&wm831x_boostp_driver);
986 platform_driver_unregister(&wm831x_buckp_driver);
987 platform_driver_unregister(&wm831x_buckv_driver);
988 }
989 module_exit(wm831x_dcdc_exit);
990
991 /* Module information */
992 MODULE_AUTHOR("Mark Brown");
993 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
994 MODULE_LICENSE("GPL");
995 MODULE_ALIAS("platform:wm831x-buckv");
996 MODULE_ALIAS("platform:wm831x-buckp");
997 MODULE_ALIAS("platform:wm831x-epe");
Linux with added FPC-III support