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Merge remote-tracking branch 'asoc/topic/sn95031' into asoc-next
[deliverable/linux.git] / drivers / regulator / wm831x-dcdc.c
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 = DIV_ROUND_UP(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 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 = ARRAY_SIZE(wm831x_dcdc_ilim) - 1; i >= 0; i--) {
343 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
344 (wm831x_dcdc_ilim[i] <= max_uA))
345 return wm831x_set_bits(wm831x, reg,
346 WM831X_DC1_HC_THR_MASK,
347 i << WM831X_DC1_HC_THR_SHIFT);
348 }
349
350 return -EINVAL;
351 }
352
353 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
354 {
355 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
356 struct wm831x *wm831x = dcdc->wm831x;
357 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
358 int val;
359
360 val = wm831x_reg_read(wm831x, reg);
361 if (val < 0)
362 return val;
363
364 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
365 return wm831x_dcdc_ilim[val];
366 }
367
368 static struct regulator_ops wm831x_buckv_ops = {
369 .set_voltage_sel = wm831x_buckv_set_voltage_sel,
370 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
371 .list_voltage = wm831x_buckv_list_voltage,
372 .map_voltage = wm831x_buckv_map_voltage,
373 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
374 .set_current_limit = wm831x_buckv_set_current_limit,
375 .get_current_limit = wm831x_buckv_get_current_limit,
376
377 .is_enabled = regulator_is_enabled_regmap,
378 .enable = regulator_enable_regmap,
379 .disable = regulator_disable_regmap,
380 .get_status = wm831x_dcdc_get_status,
381 .get_mode = wm831x_dcdc_get_mode,
382 .set_mode = wm831x_dcdc_set_mode,
383 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
384 };
385
386 /*
387 * Set up DVS control. We just log errors since we can still run
388 * (with reduced performance) if we fail.
389 */
390 static void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
391 struct wm831x_buckv_pdata *pdata)
392 {
393 struct wm831x *wm831x = dcdc->wm831x;
394 int ret;
395 u16 ctrl;
396
397 if (!pdata || !pdata->dvs_gpio)
398 return;
399
400 /* gpiolib won't let us read the GPIO status so pick the higher
401 * of the two existing voltages so we take it as platform data.
402 */
403 dcdc->dvs_gpio_state = pdata->dvs_init_state;
404
405 ret = gpio_request_one(pdata->dvs_gpio,
406 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
407 "DCDC DVS");
408 if (ret < 0) {
409 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
410 dcdc->name, ret);
411 return;
412 }
413
414 dcdc->dvs_gpio = pdata->dvs_gpio;
415
416 switch (pdata->dvs_control_src) {
417 case 1:
418 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
419 break;
420 case 2:
421 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
422 break;
423 default:
424 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
425 pdata->dvs_control_src, dcdc->name);
426 return;
427 }
428
429 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
430 * to make bootstrapping a bit smoother.
431 */
432 if (!dcdc->dvs_vsel) {
433 ret = wm831x_set_bits(wm831x,
434 dcdc->base + WM831X_DCDC_DVS_CONTROL,
435 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
436 if (ret == 0)
437 dcdc->dvs_vsel = dcdc->on_vsel;
438 else
439 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
440 ret);
441 }
442
443 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
444 WM831X_DC1_DVS_SRC_MASK, ctrl);
445 if (ret < 0) {
446 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
447 dcdc->name, ret);
448 }
449 }
450
451 static int wm831x_buckv_probe(struct platform_device *pdev)
452 {
453 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
454 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
455 struct regulator_config config = { };
456 int id;
457 struct wm831x_dcdc *dcdc;
458 struct resource *res;
459 int ret, irq;
460
461 if (pdata && pdata->wm831x_num)
462 id = (pdata->wm831x_num * 10) + 1;
463 else
464 id = 0;
465 id = pdev->id - id;
466
467 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
468
469 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
470 GFP_KERNEL);
471 if (dcdc == NULL) {
472 dev_err(&pdev->dev, "Unable to allocate private data\n");
473 return -ENOMEM;
474 }
475
476 dcdc->wm831x = wm831x;
477
478 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
479 if (res == NULL) {
480 dev_err(&pdev->dev, "No REG resource\n");
481 ret = -EINVAL;
482 goto err;
483 }
484 dcdc->base = res->start;
485
486 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
487 dcdc->desc.name = dcdc->name;
488
489 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
490 "DC%dVDD", id + 1);
491 dcdc->desc.supply_name = dcdc->supply_name;
492
493 dcdc->desc.id = id;
494 dcdc->desc.type = REGULATOR_VOLTAGE;
495 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
496 dcdc->desc.ops = &wm831x_buckv_ops;
497 dcdc->desc.owner = THIS_MODULE;
498 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
499 dcdc->desc.enable_mask = 1 << id;
500
501 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
502 if (ret < 0) {
503 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
504 goto err;
505 }
506 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
507
508 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
509 if (ret < 0) {
510 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
511 goto err;
512 }
513 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
514
515 if (pdata && pdata->dcdc[id])
516 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
517
518 config.dev = pdev->dev.parent;
519 if (pdata)
520 config.init_data = pdata->dcdc[id];
521 config.driver_data = dcdc;
522 config.regmap = wm831x->regmap;
523
524 dcdc->regulator = regulator_register(&dcdc->desc, &config);
525 if (IS_ERR(dcdc->regulator)) {
526 ret = PTR_ERR(dcdc->regulator);
527 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
528 id + 1, ret);
529 goto err;
530 }
531
532 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
533 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
534 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
535 if (ret != 0) {
536 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
537 irq, ret);
538 goto err_regulator;
539 }
540
541 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
542 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
543 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
544 if (ret != 0) {
545 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
546 irq, ret);
547 goto err_uv;
548 }
549
550 platform_set_drvdata(pdev, dcdc);
551
552 return 0;
553
554 err_uv:
555 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
556 dcdc);
557 err_regulator:
558 regulator_unregister(dcdc->regulator);
559 err:
560 if (dcdc->dvs_gpio)
561 gpio_free(dcdc->dvs_gpio);
562 return ret;
563 }
564
565 static int wm831x_buckv_remove(struct platform_device *pdev)
566 {
567 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
568 struct wm831x *wm831x = dcdc->wm831x;
569
570 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")),
571 dcdc);
572 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
573 dcdc);
574 regulator_unregister(dcdc->regulator);
575 if (dcdc->dvs_gpio)
576 gpio_free(dcdc->dvs_gpio);
577
578 return 0;
579 }
580
581 static struct platform_driver wm831x_buckv_driver = {
582 .probe = wm831x_buckv_probe,
583 .remove = wm831x_buckv_remove,
584 .driver = {
585 .name = "wm831x-buckv",
586 .owner = THIS_MODULE,
587 },
588 };
589
590 /*
591 * BUCKP specifics
592 */
593
594 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
595 {
596 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
597 struct wm831x *wm831x = dcdc->wm831x;
598 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
599 int sel;
600
601 sel = regulator_map_voltage_linear(rdev, uV, uV);
602 if (sel < 0)
603 return sel;
604
605 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
606 }
607
608 static struct regulator_ops wm831x_buckp_ops = {
609 .set_voltage_sel = regulator_set_voltage_sel_regmap,
610 .get_voltage_sel = regulator_get_voltage_sel_regmap,
611 .list_voltage = regulator_list_voltage_linear,
612 .map_voltage = regulator_map_voltage_linear,
613 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
614
615 .is_enabled = regulator_is_enabled_regmap,
616 .enable = regulator_enable_regmap,
617 .disable = regulator_disable_regmap,
618 .get_status = wm831x_dcdc_get_status,
619 .get_mode = wm831x_dcdc_get_mode,
620 .set_mode = wm831x_dcdc_set_mode,
621 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
622 };
623
624 static int wm831x_buckp_probe(struct platform_device *pdev)
625 {
626 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
627 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
628 struct regulator_config config = { };
629 int id;
630 struct wm831x_dcdc *dcdc;
631 struct resource *res;
632 int ret, irq;
633
634 if (pdata && pdata->wm831x_num)
635 id = (pdata->wm831x_num * 10) + 1;
636 else
637 id = 0;
638 id = pdev->id - id;
639
640 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
641
642 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
643 GFP_KERNEL);
644 if (dcdc == NULL) {
645 dev_err(&pdev->dev, "Unable to allocate private data\n");
646 return -ENOMEM;
647 }
648
649 dcdc->wm831x = wm831x;
650
651 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
652 if (res == NULL) {
653 dev_err(&pdev->dev, "No REG resource\n");
654 ret = -EINVAL;
655 goto err;
656 }
657 dcdc->base = res->start;
658
659 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
660 dcdc->desc.name = dcdc->name;
661
662 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
663 "DC%dVDD", id + 1);
664 dcdc->desc.supply_name = dcdc->supply_name;
665
666 dcdc->desc.id = id;
667 dcdc->desc.type = REGULATOR_VOLTAGE;
668 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
669 dcdc->desc.ops = &wm831x_buckp_ops;
670 dcdc->desc.owner = THIS_MODULE;
671 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
672 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
673 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
674 dcdc->desc.enable_mask = 1 << id;
675 dcdc->desc.min_uV = 850000;
676 dcdc->desc.uV_step = 25000;
677
678 config.dev = pdev->dev.parent;
679 if (pdata)
680 config.init_data = pdata->dcdc[id];
681 config.driver_data = dcdc;
682 config.regmap = wm831x->regmap;
683
684 dcdc->regulator = regulator_register(&dcdc->desc, &config);
685 if (IS_ERR(dcdc->regulator)) {
686 ret = PTR_ERR(dcdc->regulator);
687 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
688 id + 1, ret);
689 goto err;
690 }
691
692 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
693 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
694 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
695 if (ret != 0) {
696 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
697 irq, ret);
698 goto err_regulator;
699 }
700
701 platform_set_drvdata(pdev, dcdc);
702
703 return 0;
704
705 err_regulator:
706 regulator_unregister(dcdc->regulator);
707 err:
708 return ret;
709 }
710
711 static int wm831x_buckp_remove(struct platform_device *pdev)
712 {
713 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
714
715 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
716 dcdc);
717 regulator_unregister(dcdc->regulator);
718
719 return 0;
720 }
721
722 static struct platform_driver wm831x_buckp_driver = {
723 .probe = wm831x_buckp_probe,
724 .remove = wm831x_buckp_remove,
725 .driver = {
726 .name = "wm831x-buckp",
727 .owner = THIS_MODULE,
728 },
729 };
730
731 /*
732 * DCDC boost convertors
733 */
734
735 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
736 {
737 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
738 struct wm831x *wm831x = dcdc->wm831x;
739 int ret;
740
741 /* First, check for errors */
742 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
743 if (ret < 0)
744 return ret;
745
746 if (ret & (1 << rdev_get_id(rdev))) {
747 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
748 rdev_get_id(rdev) + 1);
749 return REGULATOR_STATUS_ERROR;
750 }
751
752 /* Is the regulator on? */
753 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
754 if (ret < 0)
755 return ret;
756 if (ret & (1 << rdev_get_id(rdev)))
757 return REGULATOR_STATUS_ON;
758 else
759 return REGULATOR_STATUS_OFF;
760 }
761
762 static struct regulator_ops wm831x_boostp_ops = {
763 .get_status = wm831x_boostp_get_status,
764
765 .is_enabled = regulator_is_enabled_regmap,
766 .enable = regulator_enable_regmap,
767 .disable = regulator_disable_regmap,
768 };
769
770 static int wm831x_boostp_probe(struct platform_device *pdev)
771 {
772 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
773 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
774 struct regulator_config config = { };
775 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
776 struct wm831x_dcdc *dcdc;
777 struct resource *res;
778 int ret, irq;
779
780 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
781
782 if (pdata == NULL || pdata->dcdc[id] == NULL)
783 return -ENODEV;
784
785 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
786 if (dcdc == NULL) {
787 dev_err(&pdev->dev, "Unable to allocate private data\n");
788 return -ENOMEM;
789 }
790
791 dcdc->wm831x = wm831x;
792
793 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
794 if (res == NULL) {
795 dev_err(&pdev->dev, "No REG resource\n");
796 ret = -EINVAL;
797 goto err;
798 }
799 dcdc->base = res->start;
800
801 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
802 dcdc->desc.name = dcdc->name;
803 dcdc->desc.id = id;
804 dcdc->desc.type = REGULATOR_VOLTAGE;
805 dcdc->desc.ops = &wm831x_boostp_ops;
806 dcdc->desc.owner = THIS_MODULE;
807 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
808 dcdc->desc.enable_mask = 1 << id;
809
810 config.dev = pdev->dev.parent;
811 if (pdata)
812 config.init_data = pdata->dcdc[id];
813 config.driver_data = dcdc;
814 config.regmap = wm831x->regmap;
815
816 dcdc->regulator = regulator_register(&dcdc->desc, &config);
817 if (IS_ERR(dcdc->regulator)) {
818 ret = PTR_ERR(dcdc->regulator);
819 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
820 id + 1, ret);
821 goto err;
822 }
823
824 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
825 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
826 IRQF_TRIGGER_RISING, dcdc->name,
827 dcdc);
828 if (ret != 0) {
829 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
830 irq, ret);
831 goto err_regulator;
832 }
833
834 platform_set_drvdata(pdev, dcdc);
835
836 return 0;
837
838 err_regulator:
839 regulator_unregister(dcdc->regulator);
840 err:
841 return ret;
842 }
843
844 static int wm831x_boostp_remove(struct platform_device *pdev)
845 {
846 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
847
848 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")),
849 dcdc);
850 regulator_unregister(dcdc->regulator);
851
852 return 0;
853 }
854
855 static struct platform_driver wm831x_boostp_driver = {
856 .probe = wm831x_boostp_probe,
857 .remove = wm831x_boostp_remove,
858 .driver = {
859 .name = "wm831x-boostp",
860 .owner = THIS_MODULE,
861 },
862 };
863
864 /*
865 * External Power Enable
866 *
867 * These aren't actually DCDCs but look like them in hardware so share
868 * code.
869 */
870
871 #define WM831X_EPE_BASE 6
872
873 static struct regulator_ops wm831x_epe_ops = {
874 .is_enabled = regulator_is_enabled_regmap,
875 .enable = regulator_enable_regmap,
876 .disable = regulator_disable_regmap,
877 .get_status = wm831x_dcdc_get_status,
878 };
879
880 static int wm831x_epe_probe(struct platform_device *pdev)
881 {
882 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
883 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
884 struct regulator_config config = { };
885 int id = pdev->id % ARRAY_SIZE(pdata->epe);
886 struct wm831x_dcdc *dcdc;
887 int ret;
888
889 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
890
891 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
892 if (dcdc == NULL) {
893 dev_err(&pdev->dev, "Unable to allocate private data\n");
894 return -ENOMEM;
895 }
896
897 dcdc->wm831x = wm831x;
898
899 /* For current parts this is correct; probably need to revisit
900 * in future.
901 */
902 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
903 dcdc->desc.name = dcdc->name;
904 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
905 dcdc->desc.ops = &wm831x_epe_ops;
906 dcdc->desc.type = REGULATOR_VOLTAGE;
907 dcdc->desc.owner = THIS_MODULE;
908 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
909 dcdc->desc.enable_mask = 1 << dcdc->desc.id;
910
911 config.dev = pdev->dev.parent;
912 if (pdata)
913 config.init_data = pdata->epe[id];
914 config.driver_data = dcdc;
915 config.regmap = wm831x->regmap;
916
917 dcdc->regulator = regulator_register(&dcdc->desc, &config);
918 if (IS_ERR(dcdc->regulator)) {
919 ret = PTR_ERR(dcdc->regulator);
920 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
921 id + 1, ret);
922 goto err;
923 }
924
925 platform_set_drvdata(pdev, dcdc);
926
927 return 0;
928
929 err:
930 return ret;
931 }
932
933 static int wm831x_epe_remove(struct platform_device *pdev)
934 {
935 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
936
937 regulator_unregister(dcdc->regulator);
938
939 return 0;
940 }
941
942 static struct platform_driver wm831x_epe_driver = {
943 .probe = wm831x_epe_probe,
944 .remove = wm831x_epe_remove,
945 .driver = {
946 .name = "wm831x-epe",
947 .owner = THIS_MODULE,
948 },
949 };
950
951 static int __init wm831x_dcdc_init(void)
952 {
953 int ret;
954 ret = platform_driver_register(&wm831x_buckv_driver);
955 if (ret != 0)
956 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
957
958 ret = platform_driver_register(&wm831x_buckp_driver);
959 if (ret != 0)
960 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
961
962 ret = platform_driver_register(&wm831x_boostp_driver);
963 if (ret != 0)
964 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
965
966 ret = platform_driver_register(&wm831x_epe_driver);
967 if (ret != 0)
968 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
969
970 return 0;
971 }
972 subsys_initcall(wm831x_dcdc_init);
973
974 static void __exit wm831x_dcdc_exit(void)
975 {
976 platform_driver_unregister(&wm831x_epe_driver);
977 platform_driver_unregister(&wm831x_boostp_driver);
978 platform_driver_unregister(&wm831x_buckp_driver);
979 platform_driver_unregister(&wm831x_buckv_driver);
980 }
981 module_exit(wm831x_dcdc_exit);
982
983 /* Module information */
984 MODULE_AUTHOR("Mark Brown");
985 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
986 MODULE_LICENSE("GPL");
987 MODULE_ALIAS("platform:wm831x-buckv");
988 MODULE_ALIAS("platform:wm831x-buckp");
989 MODULE_ALIAS("platform:wm831x-boostp");
990 MODULE_ALIAS("platform:wm831x-epe");
Linux kernel - Deliverables
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