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>
24 #include <linux/slab.h>
26 #include <linux/mfd/wm831x/core.h>
27 #include <linux/mfd/wm831x/regulator.h>
28 #include <linux/mfd/wm831x/pdata.h>
30 #define WM831X_BUCKV_MAX_SELECTOR 0x68
31 #define WM831X_BUCKP_MAX_SELECTOR 0x66
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
38 #define WM831X_DCDC_MAX_NAME 6
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
52 char name[WM831X_DCDC_MAX_NAME];
53 struct regulator_desc desc;
55 struct wm831x *wm831x;
56 struct regulator_dev *regulator;
63 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
65 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
66 struct wm831x *wm831x = dcdc->wm831x;
67 int mask = 1 << rdev_get_id(rdev);
70 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
80 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
82 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
83 struct wm831x *wm831x = dcdc->wm831x;
84 int mask = 1 << rdev_get_id(rdev);
86 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
89 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
91 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
92 struct wm831x *wm831x = dcdc->wm831x;
93 int mask = 1 << rdev_get_id(rdev);
95 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
98 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
101 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
102 struct wm831x *wm831x = dcdc->wm831x;
103 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
106 val = wm831x_reg_read(wm831x, reg);
110 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
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;
127 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
133 case REGULATOR_MODE_FAST:
134 val = WM831X_DCDC_MODE_FAST;
136 case REGULATOR_MODE_NORMAL:
137 val = WM831X_DCDC_MODE_NORMAL;
139 case REGULATOR_MODE_STANDBY:
140 val = WM831X_DCDC_MODE_STANDBY;
142 case REGULATOR_MODE_IDLE:
143 val = WM831X_DCDC_MODE_IDLE;
149 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
150 val << WM831X_DC1_ON_MODE_SHIFT);
153 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
155 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
156 struct wm831x *wm831x = dcdc->wm831x;
157 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
159 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
162 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
165 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
166 struct wm831x *wm831x = dcdc->wm831x;
167 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
169 return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
172 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
174 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
175 struct wm831x *wm831x = dcdc->wm831x;
178 /* First, check for errors */
179 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
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;
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;
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;
204 /* Is the regulator on? */
205 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
208 if (!(ret & (1 << rdev_get_id(rdev))))
209 return REGULATOR_STATUS_OFF;
211 /* TODO: When we handle hardware control modes so we can report the
213 return REGULATOR_STATUS_ON;
216 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
218 struct wm831x_dcdc *dcdc = data;
220 regulator_notifier_call_chain(dcdc->regulator,
221 REGULATOR_EVENT_UNDER_VOLTAGE,
227 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
229 struct wm831x_dcdc *dcdc = data;
231 regulator_notifier_call_chain(dcdc->regulator,
232 REGULATOR_EVENT_OVER_CURRENT,
242 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
247 if (selector <= WM831X_BUCKV_MAX_SELECTOR)
248 return 600000 + ((selector - 0x8) * 12500);
252 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
253 int min_uV, int max_uV)
259 else if (min_uV <= 1800000)
260 vsel = ((min_uV - 600000) / 12500) + 8;
264 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
270 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
272 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
274 if (state == dcdc->dvs_gpio_state)
277 dcdc->dvs_gpio_state = state;
278 gpio_set_value(dcdc->dvs_gpio, state);
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.
288 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
289 int min_uV, int max_uV, unsigned *selector)
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;
297 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
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);
307 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
308 return wm831x_buckv_set_dvs(rdev, 1);
310 /* Always set the ON status to the minimum voltage */
311 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
314 dcdc->on_vsel = vsel;
319 /* Kick the voltage transition now */
320 ret = wm831x_buckv_set_dvs(rdev, 0);
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
330 if (vsel > dcdc->dvs_vsel) {
331 ret = wm831x_set_bits(wm831x, dvs_reg,
332 WM831X_DC1_DVS_VSEL_MASK,
335 dcdc->dvs_vsel = vsel;
337 dev_warn(wm831x->dev,
338 "Failed to set DCDC DVS VSEL: %d\n", ret);
344 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
347 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
348 struct wm831x *wm831x = dcdc->wm831x;
349 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
352 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
356 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
359 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
361 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
363 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
364 return dcdc->dvs_vsel;
366 return dcdc->on_vsel;
369 /* Current limit options */
370 static u16 wm831x_dcdc_ilim[] = {
371 125, 250, 375, 500, 625, 750, 875, 1000
374 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
375 int min_uA, int max_uA)
377 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
378 struct wm831x *wm831x = dcdc->wm831x;
379 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
382 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
383 if ((min_uA <= wm831x_dcdc_ilim[i]) &&
384 (wm831x_dcdc_ilim[i] <= max_uA))
387 if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
390 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK,
391 i << WM831X_DC1_HC_THR_SHIFT);
394 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
396 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
397 struct wm831x *wm831x = dcdc->wm831x;
398 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
401 val = wm831x_reg_read(wm831x, reg);
405 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
406 return wm831x_dcdc_ilim[val];
409 static struct regulator_ops wm831x_buckv_ops = {
410 .set_voltage = wm831x_buckv_set_voltage,
411 .get_voltage_sel = wm831x_buckv_get_voltage_sel,
412 .list_voltage = wm831x_buckv_list_voltage,
413 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
414 .set_current_limit = wm831x_buckv_set_current_limit,
415 .get_current_limit = wm831x_buckv_get_current_limit,
417 .is_enabled = wm831x_dcdc_is_enabled,
418 .enable = wm831x_dcdc_enable,
419 .disable = wm831x_dcdc_disable,
420 .get_status = wm831x_dcdc_get_status,
421 .get_mode = wm831x_dcdc_get_mode,
422 .set_mode = wm831x_dcdc_set_mode,
423 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
427 * Set up DVS control. We just log errors since we can still run
428 * (with reduced performance) if we fail.
430 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
431 struct wm831x_buckv_pdata *pdata)
433 struct wm831x *wm831x = dcdc->wm831x;
437 if (!pdata || !pdata->dvs_gpio)
440 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
442 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
447 /* gpiolib won't let us read the GPIO status so pick the higher
448 * of the two existing voltages so we take it as platform data.
450 dcdc->dvs_gpio_state = pdata->dvs_init_state;
452 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
454 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
456 gpio_free(pdata->dvs_gpio);
460 dcdc->dvs_gpio = pdata->dvs_gpio;
462 switch (pdata->dvs_control_src) {
464 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
467 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
470 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
471 pdata->dvs_control_src, dcdc->name);
475 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
476 * to make bootstrapping a bit smoother.
478 if (!dcdc->dvs_vsel) {
479 ret = wm831x_set_bits(wm831x,
480 dcdc->base + WM831X_DCDC_DVS_CONTROL,
481 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
483 dcdc->dvs_vsel = dcdc->on_vsel;
485 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
489 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
490 WM831X_DC1_DVS_SRC_MASK, ctrl);
492 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
497 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
499 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
500 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
502 struct wm831x_dcdc *dcdc;
503 struct resource *res;
506 if (pdata && pdata->wm831x_num)
507 id = (pdata->wm831x_num * 10) + 1;
512 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
514 if (pdata == NULL || pdata->dcdc[id] == NULL)
517 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
520 dev_err(&pdev->dev, "Unable to allocate private data\n");
524 dcdc->wm831x = wm831x;
526 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
528 dev_err(&pdev->dev, "No I/O resource\n");
532 dcdc->base = res->start;
534 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
535 dcdc->desc.name = dcdc->name;
537 dcdc->desc.type = REGULATOR_VOLTAGE;
538 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
539 dcdc->desc.ops = &wm831x_buckv_ops;
540 dcdc->desc.owner = THIS_MODULE;
542 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
544 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
547 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
549 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
551 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
554 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
557 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
559 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
560 pdata->dcdc[id], dcdc, NULL);
561 if (IS_ERR(dcdc->regulator)) {
562 ret = PTR_ERR(dcdc->regulator);
563 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
568 irq = platform_get_irq_byname(pdev, "UV");
569 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
570 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
572 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
577 irq = platform_get_irq_byname(pdev, "HC");
578 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
579 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
581 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
586 platform_set_drvdata(pdev, dcdc);
591 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
593 regulator_unregister(dcdc->regulator);
596 gpio_free(dcdc->dvs_gpio);
600 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
602 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
604 platform_set_drvdata(pdev, NULL);
606 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
607 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
608 regulator_unregister(dcdc->regulator);
610 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, int *selector)
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)
654 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
657 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
658 int min_uV, int max_uV,
661 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
662 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
664 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
668 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
671 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
672 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
675 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
678 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev)
680 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
681 struct wm831x *wm831x = dcdc->wm831x;
682 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
685 val = wm831x_reg_read(wm831x, reg);
689 return val & WM831X_DC3_ON_VSEL_MASK;
692 static struct regulator_ops wm831x_buckp_ops = {
693 .set_voltage = wm831x_buckp_set_voltage,
694 .get_voltage_sel = wm831x_buckp_get_voltage_sel,
695 .list_voltage = wm831x_buckp_list_voltage,
696 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
698 .is_enabled = wm831x_dcdc_is_enabled,
699 .enable = wm831x_dcdc_enable,
700 .disable = wm831x_dcdc_disable,
701 .get_status = wm831x_dcdc_get_status,
702 .get_mode = wm831x_dcdc_get_mode,
703 .set_mode = wm831x_dcdc_set_mode,
704 .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
707 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
709 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
710 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
712 struct wm831x_dcdc *dcdc;
713 struct resource *res;
716 if (pdata && pdata->wm831x_num)
717 id = (pdata->wm831x_num * 10) + 1;
722 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
724 if (pdata == NULL || pdata->dcdc[id] == NULL)
727 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc),
730 dev_err(&pdev->dev, "Unable to allocate private data\n");
734 dcdc->wm831x = wm831x;
736 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
738 dev_err(&pdev->dev, "No I/O resource\n");
742 dcdc->base = res->start;
744 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
745 dcdc->desc.name = dcdc->name;
747 dcdc->desc.type = REGULATOR_VOLTAGE;
748 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
749 dcdc->desc.ops = &wm831x_buckp_ops;
750 dcdc->desc.owner = THIS_MODULE;
752 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
753 pdata->dcdc[id], dcdc, NULL);
754 if (IS_ERR(dcdc->regulator)) {
755 ret = PTR_ERR(dcdc->regulator);
756 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
761 irq = platform_get_irq_byname(pdev, "UV");
762 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
763 IRQF_TRIGGER_RISING, dcdc->name, dcdc);
765 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
770 platform_set_drvdata(pdev, dcdc);
775 regulator_unregister(dcdc->regulator);
780 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
782 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
784 platform_set_drvdata(pdev, NULL);
786 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
787 regulator_unregister(dcdc->regulator);
792 static struct platform_driver wm831x_buckp_driver = {
793 .probe = wm831x_buckp_probe,
794 .remove = __devexit_p(wm831x_buckp_remove),
796 .name = "wm831x-buckp",
797 .owner = THIS_MODULE,
802 * DCDC boost convertors
805 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
807 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
808 struct wm831x *wm831x = dcdc->wm831x;
811 /* First, check for errors */
812 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
816 if (ret & (1 << rdev_get_id(rdev))) {
817 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
818 rdev_get_id(rdev) + 1);
819 return REGULATOR_STATUS_ERROR;
822 /* Is the regulator on? */
823 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
826 if (ret & (1 << rdev_get_id(rdev)))
827 return REGULATOR_STATUS_ON;
829 return REGULATOR_STATUS_OFF;
832 static struct regulator_ops wm831x_boostp_ops = {
833 .get_status = wm831x_boostp_get_status,
835 .is_enabled = wm831x_dcdc_is_enabled,
836 .enable = wm831x_dcdc_enable,
837 .disable = wm831x_dcdc_disable,
840 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
842 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
843 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
844 int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
845 struct wm831x_dcdc *dcdc;
846 struct resource *res;
849 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
851 if (pdata == NULL || pdata->dcdc[id] == NULL)
854 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
856 dev_err(&pdev->dev, "Unable to allocate private data\n");
860 dcdc->wm831x = wm831x;
862 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
864 dev_err(&pdev->dev, "No I/O resource\n");
868 dcdc->base = res->start;
870 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
871 dcdc->desc.name = dcdc->name;
873 dcdc->desc.type = REGULATOR_VOLTAGE;
874 dcdc->desc.ops = &wm831x_boostp_ops;
875 dcdc->desc.owner = THIS_MODULE;
877 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
878 pdata->dcdc[id], dcdc, NULL);
879 if (IS_ERR(dcdc->regulator)) {
880 ret = PTR_ERR(dcdc->regulator);
881 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
886 irq = platform_get_irq_byname(pdev, "UV");
887 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
888 IRQF_TRIGGER_RISING, dcdc->name,
891 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
896 platform_set_drvdata(pdev, dcdc);
901 regulator_unregister(dcdc->regulator);
907 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
909 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
911 platform_set_drvdata(pdev, NULL);
913 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
914 regulator_unregister(dcdc->regulator);
920 static struct platform_driver wm831x_boostp_driver = {
921 .probe = wm831x_boostp_probe,
922 .remove = __devexit_p(wm831x_boostp_remove),
924 .name = "wm831x-boostp",
925 .owner = THIS_MODULE,
930 * External Power Enable
932 * These aren't actually DCDCs but look like them in hardware so share
936 #define WM831X_EPE_BASE 6
938 static struct regulator_ops wm831x_epe_ops = {
939 .is_enabled = wm831x_dcdc_is_enabled,
940 .enable = wm831x_dcdc_enable,
941 .disable = wm831x_dcdc_disable,
942 .get_status = wm831x_dcdc_get_status,
945 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
947 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
948 struct wm831x_pdata *pdata = wm831x->dev->platform_data;
949 int id = pdev->id % ARRAY_SIZE(pdata->epe);
950 struct wm831x_dcdc *dcdc;
953 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
955 if (pdata == NULL || pdata->epe[id] == NULL)
958 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
960 dev_err(&pdev->dev, "Unable to allocate private data\n");
964 dcdc->wm831x = wm831x;
966 /* For current parts this is correct; probably need to revisit
969 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
970 dcdc->desc.name = dcdc->name;
971 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
972 dcdc->desc.ops = &wm831x_epe_ops;
973 dcdc->desc.type = REGULATOR_VOLTAGE;
974 dcdc->desc.owner = THIS_MODULE;
976 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
977 pdata->epe[id], dcdc, NULL);
978 if (IS_ERR(dcdc->regulator)) {
979 ret = PTR_ERR(dcdc->regulator);
980 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
985 platform_set_drvdata(pdev, dcdc);
994 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
996 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
998 platform_set_drvdata(pdev, NULL);
1000 regulator_unregister(dcdc->regulator);
1006 static struct platform_driver wm831x_epe_driver = {
1007 .probe = wm831x_epe_probe,
1008 .remove = __devexit_p(wm831x_epe_remove),
1010 .name = "wm831x-epe",
1011 .owner = THIS_MODULE,
1015 static int __init wm831x_dcdc_init(void)
1018 ret = platform_driver_register(&wm831x_buckv_driver);
1020 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1022 ret = platform_driver_register(&wm831x_buckp_driver);
1024 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1026 ret = platform_driver_register(&wm831x_boostp_driver);
1028 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1030 ret = platform_driver_register(&wm831x_epe_driver);
1032 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1036 subsys_initcall(wm831x_dcdc_init);
1038 static void __exit wm831x_dcdc_exit(void)
1040 platform_driver_unregister(&wm831x_epe_driver);
1041 platform_driver_unregister(&wm831x_boostp_driver);
1042 platform_driver_unregister(&wm831x_buckp_driver);
1043 platform_driver_unregister(&wm831x_buckv_driver);
1045 module_exit(wm831x_dcdc_exit);
1047 /* Module information */
1048 MODULE_AUTHOR("Mark Brown");
1049 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1050 MODULE_LICENSE("GPL");
1051 MODULE_ALIAS("platform:wm831x-buckv");
1052 MODULE_ALIAS("platform:wm831x-buckp");
1053 MODULE_ALIAS("platform:wm831x-epe");