2 * wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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.
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>
25 #include <linux/mfd/wm831x/core.h>
26 #include <linux/mfd/wm831x/regulator.h>
27 #include <linux/mfd/wm831x/pdata.h>
29 #define WM831X_BUCKV_MAX_SELECTOR 0x68
30 #define WM831X_BUCKP_MAX_SELECTOR 0x66
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
37 #define WM831X_DCDC_MAX_NAME 6
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
51 char name[WM831X_DCDC_MAX_NAME];
52 struct regulator_desc desc;
54 struct wm831x *wm831x;
55 struct regulator_dev *regulator;
62 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
64 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
65 struct wm831x *wm831x = dcdc->wm831x;
66 int mask = 1 << rdev_get_id(rdev);
69 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
79 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
81 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
82 struct wm831x *wm831x = dcdc->wm831x;
83 int mask = 1 << rdev_get_id(rdev);
85 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
88 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
90 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
91 struct wm831x *wm831x = dcdc->wm831x;
92 int mask = 1 << rdev_get_id(rdev);
94 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
97 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
100 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
101 struct wm831x *wm831x = dcdc->wm831x;
102 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
105 val = wm831x_reg_read(wm831x, reg);
109 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
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;
125 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
131 case REGULATOR_MODE_FAST:
132 val = WM831X_DCDC_MODE_FAST;
134 case REGULATOR_MODE_NORMAL:
135 val = WM831X_DCDC_MODE_NORMAL;
137 case REGULATOR_MODE_STANDBY:
138 val = WM831X_DCDC_MODE_STANDBY;
140 case REGULATOR_MODE_IDLE:
141 val = WM831X_DCDC_MODE_IDLE;
147 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
148 val << WM831X_DC1_ON_MODE_SHIFT);
151 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
153 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
154 struct wm831x *wm831x = dcdc->wm831x;
155 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
157 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
160 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
163 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
164 struct wm831x *wm831x = dcdc->wm831x;
165 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
167 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
170 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
172 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
173 struct wm831x *wm831x = dcdc->wm831x;
176 /* First, check for errors */
177 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
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;
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;
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;
202 /* Is the regulator on? */
203 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
206 if (!(ret & (1 << rdev_get_id(rdev))))
207 return REGULATOR_STATUS_OFF;
209 /* TODO: When we handle hardware control modes so we can report the
211 return REGULATOR_STATUS_ON;
214 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
216 struct wm831x_dcdc *dcdc = data;
218 regulator_notifier_call_chain(dcdc->regulator,
219 REGULATOR_EVENT_UNDER_VOLTAGE,
225 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
227 struct wm831x_dcdc *dcdc = data;
229 regulator_notifier_call_chain(dcdc->regulator,
230 REGULATOR_EVENT_OVER_CURRENT,
240 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
245 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
246 return 600000 + ((selector - 0x8) * 12500);
250 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
251 int min_uV, int max_uV)
257 else if (min_uV <= 1800000)
258 vsel = ((min_uV - 600000) / 12500) + 8;
262 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
268 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
269 int min_uV, int max_uV)
273 if (max_uV < 600000 || max_uV > 1800000)
276 vsel = ((max_uV - 600000) / 12500) + 8;
278 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
279 wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
285 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
287 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
289 if (state == dcdc->dvs_gpio_state)
292 dcdc->dvs_gpio_state = state;
293 gpio_set_value(dcdc->dvs_gpio, state);
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.
303 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
304 int min_uV, int max_uV)
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;
312 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
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);
320 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
321 return wm831x_buckv_set_dvs(rdev, 1);
323 /* Always set the ON status to the minimum voltage */
324 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
327 dcdc->on_vsel = vsel;
332 /* Kick the voltage transition now */
333 ret = wm831x_buckv_set_dvs(rdev, 0);
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);
342 /* This should never happen - at worst the same vsel
343 * should be chosen */
348 /* Don't bother if it's the same VSEL we're already using */
349 if (vsel == dcdc->on_vsel)
352 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
354 dcdc->dvs_vsel = vsel;
356 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
362 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
365 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
366 struct wm831x *wm831x = dcdc->wm831x;
367 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
370 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
374 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
377 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
379 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
381 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
382 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel);
384 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel);
387 /* Current limit options */
388 static u16 wm831x_dcdc_ilim[] = {
389 125, 250, 375, 500, 625, 750, 875, 1000
392 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
393 int min_uA, int max_uA)
395 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
396 struct wm831x *wm831x = dcdc->wm831x;
397 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
400 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
401 if (max_uA <= wm831x_dcdc_ilim[i])
404 if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
407 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
410 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
412 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
413 struct wm831x *wm831x = dcdc->wm831x;
414 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
417 val = wm831x_reg_read(wm831x, reg);
421 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
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,
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,
442 * Set up DVS control. We just log errors since we can still run
443 * (with reduced performance) if we fail.
445 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
446 struct wm831x_buckv_pdata *pdata)
448 struct wm831x *wm831x = dcdc->wm831x;
452 if (!pdata || !pdata->dvs_gpio)
455 switch (pdata->dvs_control_src) {
457 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
460 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
463 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
464 pdata->dvs_control_src, dcdc->name);
468 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
469 WM831X_DC1_DVS_SRC_MASK, ctrl);
471 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
476 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
478 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
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.
486 dcdc->dvs_gpio_state = pdata->dvs_init_state;
488 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
490 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
492 gpio_free(pdata->dvs_gpio);
496 dcdc->dvs_gpio = pdata->dvs_gpio;
499 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
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;
508 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
510 if (pdata == NULL || pdata->dcdc[id] == NULL)
513 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
515 dev_err(&pdev->dev, "Unable to allocate private data\n");
519 dcdc->wm831x = wm831x;
521 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
523 dev_err(&pdev->dev, "No I/O resource\n");
527 dcdc->base = res->start;
529 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
530 dcdc->desc.name = dcdc->name;
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;
537 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
539 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
542 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
544 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
546 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
549 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
552 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
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",
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,
568 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
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,
578 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
583 platform_set_drvdata(pdev, dcdc);
588 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
590 regulator_unregister(dcdc->regulator);
593 gpio_free(dcdc->dvs_gpio);
598 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
600 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
601 struct wm831x *wm831x = dcdc->wm831x;
603 platform_set_drvdata(pdev, NULL);
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);
609 gpio_free(dcdc->dvs_gpio);
615 static struct platform_driver wm831x_buckv_driver = {
616 .probe = wm831x_buckv_probe,
617 .remove = __devexit_p(wm831x_buckv_remove),
619 .name = "wm831x-buckv",
620 .owner = THIS_MODULE,
628 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
631 if (selector <= WM831X_BUCKP_MAX_SELECTOR)
632 return 850000 + (selector * 25000);
637 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
638 int min_uV, int max_uV)
640 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
641 struct wm831x *wm831x = dcdc->wm831x;
644 if (min_uV <= 34000000)
645 vsel = (min_uV - 850000) / 25000;
649 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
652 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
655 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
656 int min_uV, int max_uV)
658 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
659 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
661 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
664 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
667 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
668 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
670 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
673 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
675 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
676 struct wm831x *wm831x = dcdc->wm831x;
677 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
680 val = wm831x_reg_read(wm831x, reg);
684 return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
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,
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,
702 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
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;
711 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
713 if (pdata == NULL || pdata->dcdc[id] == NULL)
716 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
718 dev_err(&pdev->dev, "Unable to allocate private data\n");
722 dcdc->wm831x = wm831x;
724 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
726 dev_err(&pdev->dev, "No I/O resource\n");
730 dcdc->base = res->start;
732 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
733 dcdc->desc.name = dcdc->name;
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;
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",
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,
754 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
759 platform_set_drvdata(pdev, dcdc);
764 regulator_unregister(dcdc->regulator);
770 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
772 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
773 struct wm831x *wm831x = dcdc->wm831x;
775 platform_set_drvdata(pdev, NULL);
777 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
778 regulator_unregister(dcdc->regulator);
784 static struct platform_driver wm831x_buckp_driver = {
785 .probe = wm831x_buckp_probe,
786 .remove = __devexit_p(wm831x_buckp_remove),
788 .name = "wm831x-buckp",
789 .owner = THIS_MODULE,
794 * DCDC boost convertors
797 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
799 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
800 struct wm831x *wm831x = dcdc->wm831x;
803 /* First, check for errors */
804 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
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;
814 /* Is the regulator on? */
815 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
818 if (ret & (1 << rdev_get_id(rdev)))
819 return REGULATOR_STATUS_ON;
821 return REGULATOR_STATUS_OFF;
824 static struct regulator_ops wm831x_boostp_ops = {
825 .get_status = wm831x_boostp_get_status,
827 .is_enabled = wm831x_dcdc_is_enabled,
828 .enable = wm831x_dcdc_enable,
829 .disable = wm831x_dcdc_disable,
832 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
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;
841 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
843 if (pdata == NULL || pdata->dcdc[id] == NULL)
846 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
848 dev_err(&pdev->dev, "Unable to allocate private data\n");
852 dcdc->wm831x = wm831x;
854 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
856 dev_err(&pdev->dev, "No I/O resource\n");
860 dcdc->base = res->start;
862 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
863 dcdc->desc.name = dcdc->name;
865 dcdc->desc.type = REGULATOR_VOLTAGE;
866 dcdc->desc.ops = &wm831x_boostp_ops;
867 dcdc->desc.owner = THIS_MODULE;
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",
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,
883 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
888 platform_set_drvdata(pdev, dcdc);
893 regulator_unregister(dcdc->regulator);
899 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
901 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
902 struct wm831x *wm831x = dcdc->wm831x;
904 platform_set_drvdata(pdev, NULL);
906 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
907 regulator_unregister(dcdc->regulator);
913 static struct platform_driver wm831x_boostp_driver = {
914 .probe = wm831x_boostp_probe,
915 .remove = __devexit_p(wm831x_boostp_remove),
917 .name = "wm831x-boostp",
918 .owner = THIS_MODULE,
923 * External Power Enable
925 * These aren't actually DCDCs but look like them in hardware so share
929 #define WM831X_EPE_BASE 6
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,
938 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
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;
946 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
948 if (pdata == NULL || pdata->epe[id] == NULL)
951 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
953 dev_err(&pdev->dev, "Unable to allocate private data\n");
957 dcdc->wm831x = wm831x;
959 /* For current parts this is correct; probably need to revisit
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;
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",
978 platform_set_drvdata(pdev, dcdc);
987 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
989 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
991 platform_set_drvdata(pdev, NULL);
993 regulator_unregister(dcdc->regulator);
999 static struct platform_driver wm831x_epe_driver = {
1000 .probe = wm831x_epe_probe,
1001 .remove = __devexit_p(wm831x_epe_remove),
1003 .name = "wm831x-epe",
1004 .owner = THIS_MODULE,
1008 static int __init wm831x_dcdc_init(void)
1011 ret = platform_driver_register(&wm831x_buckv_driver);
1013 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1015 ret = platform_driver_register(&wm831x_buckp_driver);
1017 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1019 ret = platform_driver_register(&wm831x_boostp_driver);
1021 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1023 ret = platform_driver_register(&wm831x_epe_driver);
1025 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1029 subsys_initcall(wm831x_dcdc_init);
1031 static void __exit wm831x_dcdc_exit(void)
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);
1038 module_exit(wm831x_dcdc_exit);
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");