wm831x-dcdc.c 24.9 KB
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/*
 * wm831x-dcdc.c  --  DC-DC buck convertor driver for the WM831x series
 *
 * Copyright 2009 Wolfson Microelectronics PLC.
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/regulator.h>
#include <linux/mfd/wm831x/pdata.h>

#define WM831X_BUCKV_MAX_SELECTOR 0x68
#define WM831X_BUCKP_MAX_SELECTOR 0x66

#define WM831X_DCDC_MODE_FAST    0
#define WM831X_DCDC_MODE_NORMAL  1
#define WM831X_DCDC_MODE_IDLE    2
#define WM831X_DCDC_MODE_STANDBY 3

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#define WM831X_DCDC_MAX_NAME 9
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/* Register offsets in control block */
#define WM831X_DCDC_CONTROL_1     0
#define WM831X_DCDC_CONTROL_2     1
#define WM831X_DCDC_ON_CONFIG     2
#define WM831X_DCDC_SLEEP_CONTROL 3
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#define WM831X_DCDC_DVS_CONTROL   4
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/*
 * Shared
 */

struct wm831x_dcdc {
	char name[WM831X_DCDC_MAX_NAME];
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	char supply_name[WM831X_DCDC_MAX_NAME];
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	struct regulator_desc desc;
	int base;
	struct wm831x *wm831x;
	struct regulator_dev *regulator;
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	int dvs_gpio;
	int dvs_gpio_state;
	int on_vsel;
	int dvs_vsel;
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};

static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)

{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
	int val;

	val = wm831x_reg_read(wm831x, reg);
	if (val < 0)
		return val;

	val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;

	switch (val) {
	case WM831X_DCDC_MODE_FAST:
		return REGULATOR_MODE_FAST;
	case WM831X_DCDC_MODE_NORMAL:
		return REGULATOR_MODE_NORMAL;
	case WM831X_DCDC_MODE_STANDBY:
		return REGULATOR_MODE_STANDBY;
	case WM831X_DCDC_MODE_IDLE:
		return REGULATOR_MODE_IDLE;
	default:
		BUG();
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		return -EINVAL;
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	}
}

static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
				    unsigned int mode)
{
	int val;

	switch (mode) {
	case REGULATOR_MODE_FAST:
		val = WM831X_DCDC_MODE_FAST;
		break;
	case REGULATOR_MODE_NORMAL:
		val = WM831X_DCDC_MODE_NORMAL;
		break;
	case REGULATOR_MODE_STANDBY:
		val = WM831X_DCDC_MODE_STANDBY;
		break;
	case REGULATOR_MODE_IDLE:
		val = WM831X_DCDC_MODE_IDLE;
		break;
	default:
		return -EINVAL;
	}

	return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
			       val << WM831X_DC1_ON_MODE_SHIFT);
}

static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;

	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
}

static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
					unsigned int mode)
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;

	return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
}

static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	int ret;

	/* First, check for errors */
	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
	if (ret < 0)
		return ret;

	if (ret & (1 << rdev_get_id(rdev))) {
		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
			rdev_get_id(rdev) + 1);
		return REGULATOR_STATUS_ERROR;
	}

	/* DCDC1 and DCDC2 can additionally detect high voltage/current */
	if (rdev_get_id(rdev) < 2) {
		if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
			dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
				rdev_get_id(rdev) + 1);
			return REGULATOR_STATUS_ERROR;
		}

		if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
			dev_dbg(wm831x->dev, "DCDC%d over current\n",
				rdev_get_id(rdev) + 1);
			return REGULATOR_STATUS_ERROR;
		}
	}

	/* Is the regulator on? */
	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
	if (ret < 0)
		return ret;
	if (!(ret & (1 << rdev_get_id(rdev))))
		return REGULATOR_STATUS_OFF;

	/* TODO: When we handle hardware control modes so we can report the
	 * current mode. */
	return REGULATOR_STATUS_ON;
}

static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
{
	struct wm831x_dcdc *dcdc = data;

	regulator_notifier_call_chain(dcdc->regulator,
				      REGULATOR_EVENT_UNDER_VOLTAGE,
				      NULL);

	return IRQ_HANDLED;
}

static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
{
	struct wm831x_dcdc *dcdc = data;

	regulator_notifier_call_chain(dcdc->regulator,
				      REGULATOR_EVENT_OVER_CURRENT,
				      NULL);

	return IRQ_HANDLED;
}

/*
 * BUCKV specifics
 */

static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
				      unsigned selector)
{
	if (selector <= 0x8)
		return 600000;
	if (selector <= WM831X_BUCKV_MAX_SELECTOR)
		return 600000 + ((selector - 0x8) * 12500);
	return -EINVAL;
}

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static int wm831x_buckv_map_voltage(struct regulator_dev *rdev,
				   int min_uV, int max_uV)
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{
	u16 vsel;

	if (min_uV < 600000)
		vsel = 0;
	else if (min_uV <= 1800000)
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		vsel = DIV_ROUND_UP(min_uV - 600000, 12500) + 8;
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	else
		return -EINVAL;

	if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
		return -EINVAL;

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	return vsel;
}

static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

	if (state == dcdc->dvs_gpio_state)
		return 0;

	dcdc->dvs_gpio_state = state;
	gpio_set_value(dcdc->dvs_gpio, state);

	/* Should wait for DVS state change to be asserted if we have
	 * a GPIO for it, for now assume the device is configured
	 * for the fastest possible transition.
	 */

	return 0;
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}

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static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev,
					unsigned vsel)
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{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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	struct wm831x *wm831x = dcdc->wm831x;
	int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
	int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
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	int ret;
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	/* If this value is already set then do a GPIO update if we can */
	if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
		return wm831x_buckv_set_dvs(rdev, 0);

	if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
		return wm831x_buckv_set_dvs(rdev, 1);

	/* Always set the ON status to the minimum voltage */
	ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
	if (ret < 0)
		return ret;
	dcdc->on_vsel = vsel;

	if (!dcdc->dvs_gpio)
		return ret;

	/* Kick the voltage transition now */
	ret = wm831x_buckv_set_dvs(rdev, 0);
	if (ret < 0)
		return ret;

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	/*
	 * If this VSEL is higher than the last one we've seen then
	 * remember it as the DVS VSEL.  This is optimised for CPUfreq
	 * usage where we want to get to the highest voltage very
	 * quickly.
	 */
	if (vsel > dcdc->dvs_vsel) {
		ret = wm831x_set_bits(wm831x, dvs_reg,
				      WM831X_DC1_DVS_VSEL_MASK,
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				      vsel);
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		if (ret == 0)
			dcdc->dvs_vsel = vsel;
		else
			dev_warn(wm831x->dev,
				 "Failed to set DCDC DVS VSEL: %d\n", ret);
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	}

	return 0;
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}

static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
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					    int uV)
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{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
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	struct wm831x *wm831x = dcdc->wm831x;
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	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
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	int vsel;

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	vsel = wm831x_buckv_map_voltage(rdev, uV, uV);
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	if (vsel < 0)
		return vsel;
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	return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
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}

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static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
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{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);

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	if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
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		return dcdc->dvs_vsel;
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	else
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		return dcdc->on_vsel;
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}

/* Current limit options */
static u16 wm831x_dcdc_ilim[] = {
	125, 250, 375, 500, 625, 750, 875, 1000
};

static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
					   int min_uA, int max_uA)
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
	int i;

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	for (i = ARRAY_SIZE(wm831x_dcdc_ilim) - 1; i >= 0; i--) {
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		if ((min_uA <= wm831x_dcdc_ilim[i]) &&
		    (wm831x_dcdc_ilim[i] <= max_uA))
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			return wm831x_set_bits(wm831x, reg,
					       WM831X_DC1_HC_THR_MASK,
						i << WM831X_DC1_HC_THR_SHIFT);
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	}

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	return -EINVAL;
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}

static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
	int val;

	val = wm831x_reg_read(wm831x, reg);
	if (val < 0)
		return val;

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	val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT;
	return wm831x_dcdc_ilim[val];
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}

static struct regulator_ops wm831x_buckv_ops = {
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	.set_voltage_sel = wm831x_buckv_set_voltage_sel,
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	.get_voltage_sel = wm831x_buckv_get_voltage_sel,
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	.list_voltage = wm831x_buckv_list_voltage,
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	.map_voltage = wm831x_buckv_map_voltage,
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	.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
	.set_current_limit = wm831x_buckv_set_current_limit,
	.get_current_limit = wm831x_buckv_get_current_limit,

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	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
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	.get_status = wm831x_dcdc_get_status,
	.get_mode = wm831x_dcdc_get_mode,
	.set_mode = wm831x_dcdc_set_mode,
	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
};

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/*
 * Set up DVS control.  We just log errors since we can still run
 * (with reduced performance) if we fail.
 */
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static void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
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					    struct wm831x_buckv_pdata *pdata)
{
	struct wm831x *wm831x = dcdc->wm831x;
	int ret;
	u16 ctrl;

	if (!pdata || !pdata->dvs_gpio)
		return;

	/* gpiolib won't let us read the GPIO status so pick the higher
	 * of the two existing voltages so we take it as platform data.
	 */
	dcdc->dvs_gpio_state = pdata->dvs_init_state;

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	ret = gpio_request_one(pdata->dvs_gpio,
			       dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0,
			       "DCDC DVS");
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	if (ret < 0) {
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		dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
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			dcdc->name, ret);
		return;
	}

	dcdc->dvs_gpio = pdata->dvs_gpio;
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	switch (pdata->dvs_control_src) {
	case 1:
		ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
		break;
	case 2:
		ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
		break;
	default:
		dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
			pdata->dvs_control_src, dcdc->name);
		return;
	}

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	/* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL
	 * to make bootstrapping a bit smoother.
	 */
	if (!dcdc->dvs_vsel) {
		ret = wm831x_set_bits(wm831x,
				      dcdc->base + WM831X_DCDC_DVS_CONTROL,
				      WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel);
		if (ret == 0)
			dcdc->dvs_vsel = dcdc->on_vsel;
		else
			dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n",
				 ret);
	}

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	ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
			      WM831X_DC1_DVS_SRC_MASK, ctrl);
	if (ret < 0) {
		dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
			dcdc->name, ret);
	}
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}

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static int wm831x_buckv_probe(struct platform_device *pdev)
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{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
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	struct regulator_config config = { };
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	int id;
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	struct wm831x_dcdc *dcdc;
	struct resource *res;
	int ret, irq;

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	if (pdata && pdata->wm831x_num)
		id = (pdata->wm831x_num * 10) + 1;
	else
		id = 0;
	id = pdev->id - id;

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	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);

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	dcdc = devm_kzalloc(&pdev->dev,  sizeof(struct wm831x_dcdc),
			    GFP_KERNEL);
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	if (dcdc == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	dcdc->wm831x = wm831x;

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	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
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	if (res == NULL) {
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		dev_err(&pdev->dev, "No REG resource\n");
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		ret = -EINVAL;
		goto err;
	}
	dcdc->base = res->start;

	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
	dcdc->desc.name = dcdc->name;
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	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
		 "DC%dVDD", id + 1);
	dcdc->desc.supply_name = dcdc->supply_name;

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	dcdc->desc.id = id;
	dcdc->desc.type = REGULATOR_VOLTAGE;
	dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
	dcdc->desc.ops = &wm831x_buckv_ops;
	dcdc->desc.owner = THIS_MODULE;
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	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
	dcdc->desc.enable_mask = 1 << id;
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	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
	if (ret < 0) {
		dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
		goto err;
	}
	dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;

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	ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
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	if (ret < 0) {
		dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
		goto err;
	}
	dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;

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	if (pdata && pdata->dcdc[id])
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		wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);

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	config.dev = pdev->dev.parent;
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	if (pdata)
		config.init_data = pdata->dcdc[id];
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	config.driver_data = dcdc;
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	config.regmap = wm831x->regmap;
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	dcdc->regulator = regulator_register(&dcdc->desc, &config);
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	if (IS_ERR(dcdc->regulator)) {
		ret = PTR_ERR(dcdc->regulator);
		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
			id + 1, ret);
		goto err;
	}

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	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
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	ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
				   IRQF_TRIGGER_RISING, dcdc->name, dcdc);
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	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
			irq, ret);
		goto err_regulator;
	}

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	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC"));
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	ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
				   IRQF_TRIGGER_RISING, dcdc->name, dcdc);
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	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
			irq, ret);
		goto err_uv;
	}

	platform_set_drvdata(pdev, dcdc);

	return 0;

err_uv:
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	free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
		 dcdc);
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err_regulator:
	regulator_unregister(dcdc->regulator);
err:
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	if (dcdc->dvs_gpio)
		gpio_free(dcdc->dvs_gpio);
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	return ret;
}

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static int wm831x_buckv_remove(struct platform_device *pdev)
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{
	struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
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	struct wm831x *wm831x = dcdc->wm831x;
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	platform_set_drvdata(pdev, NULL);

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	free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")),
			    dcdc);
	free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")),
			    dcdc);
576
	regulator_unregister(dcdc->regulator);
577 578
	if (dcdc->dvs_gpio)
		gpio_free(dcdc->dvs_gpio);
579 580 581 582 583 584

	return 0;
}

static struct platform_driver wm831x_buckv_driver = {
	.probe = wm831x_buckv_probe,
585
	.remove = wm831x_buckv_remove,
586 587
	.driver		= {
		.name	= "wm831x-buckv",
588
		.owner	= THIS_MODULE,
589 590 591 592 593 594 595
	},
};

/*
 * BUCKP specifics
 */

596
static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV)
597 598 599 600
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
601 602 603 604 605
	int sel;

	sel = regulator_map_voltage_linear(rdev, uV, uV);
	if (sel < 0)
		return sel;
606

607
	return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel);
608 609 610
}

static struct regulator_ops wm831x_buckp_ops = {
611
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
612
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
613
	.list_voltage = regulator_list_voltage_linear,
614
	.map_voltage = regulator_map_voltage_linear,
615 616
	.set_suspend_voltage = wm831x_buckp_set_suspend_voltage,

617 618 619
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
620 621 622 623 624 625
	.get_status = wm831x_dcdc_get_status,
	.get_mode = wm831x_dcdc_get_mode,
	.set_mode = wm831x_dcdc_set_mode,
	.set_suspend_mode = wm831x_dcdc_set_suspend_mode,
};

626
static int wm831x_buckp_probe(struct platform_device *pdev)
627 628 629
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
630
	struct regulator_config config = { };
631
	int id;
632 633 634 635
	struct wm831x_dcdc *dcdc;
	struct resource *res;
	int ret, irq;

636 637 638 639 640 641
	if (pdata && pdata->wm831x_num)
		id = (pdata->wm831x_num * 10) + 1;
	else
		id = 0;
	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),
			    GFP_KERNEL);
646 647 648 649 650 651 652
	if (dcdc == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	dcdc->wm831x = wm831x;

653
	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
654
	if (res == NULL) {
655
		dev_err(&pdev->dev, "No REG resource\n");
656 657 658 659 660 661 662
		ret = -EINVAL;
		goto err;
	}
	dcdc->base = res->start;

	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
	dcdc->desc.name = dcdc->name;
663 664 665 666 667

	snprintf(dcdc->supply_name, sizeof(dcdc->supply_name),
		 "DC%dVDD", id + 1);
	dcdc->desc.supply_name = dcdc->supply_name;

668 669 670 671 672
	dcdc->desc.id = id;
	dcdc->desc.type = REGULATOR_VOLTAGE;
	dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
	dcdc->desc.ops = &wm831x_buckp_ops;
	dcdc->desc.owner = THIS_MODULE;
673 674
	dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
	dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK;
675 676
	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
	dcdc->desc.enable_mask = 1 << id;
677 678
	dcdc->desc.min_uV = 850000;
	dcdc->desc.uV_step = 25000;
679

680
	config.dev = pdev->dev.parent;
681 682
	if (pdata)
		config.init_data = pdata->dcdc[id];
683
	config.driver_data = dcdc;
684
	config.regmap = wm831x->regmap;
685 686

	dcdc->regulator = regulator_register(&dcdc->desc, &config);
687 688 689 690 691 692 693
	if (IS_ERR(dcdc->regulator)) {
		ret = PTR_ERR(dcdc->regulator);
		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
			id + 1, ret);
		goto err;
	}

694
	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
695 696
	ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
				   IRQF_TRIGGER_RISING,	dcdc->name, dcdc);
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
			irq, ret);
		goto err_regulator;
	}

	platform_set_drvdata(pdev, dcdc);

	return 0;

err_regulator:
	regulator_unregister(dcdc->regulator);
err:
	return ret;
}

713
static int wm831x_buckp_remove(struct platform_device *pdev)
714 715 716
{
	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")),
			    dcdc);
721 722 723 724 725 726 727
	regulator_unregister(dcdc->regulator);

	return 0;
}

static struct platform_driver wm831x_buckp_driver = {
	.probe = wm831x_buckp_probe,
728
	.remove = wm831x_buckp_remove,
729 730
	.driver		= {
		.name	= "wm831x-buckp",
731
		.owner	= THIS_MODULE,
732 733 734
	},
};

735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
/*
 * DCDC boost convertors
 */

static int wm831x_boostp_get_status(struct regulator_dev *rdev)
{
	struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
	struct wm831x *wm831x = dcdc->wm831x;
	int ret;

	/* First, check for errors */
	ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
	if (ret < 0)
		return ret;

	if (ret & (1 << rdev_get_id(rdev))) {
		dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
			rdev_get_id(rdev) + 1);
		return REGULATOR_STATUS_ERROR;
	}

	/* Is the regulator on? */
	ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
	if (ret < 0)
		return ret;
	if (ret & (1 << rdev_get_id(rdev)))
		return REGULATOR_STATUS_ON;
	else
		return REGULATOR_STATUS_OFF;
}

static struct regulator_ops wm831x_boostp_ops = {
	.get_status = wm831x_boostp_get_status,

769 770 771
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
772 773
};

774
static int wm831x_boostp_probe(struct platform_device *pdev)
775 776 777
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
778
	struct regulator_config config = { };
779 780 781 782 783 784 785 786 787 788
	int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
	struct wm831x_dcdc *dcdc;
	struct resource *res;
	int ret, irq;

	dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);

	if (pdata == NULL || pdata->dcdc[id] == NULL)
		return -ENODEV;

789
	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
790 791 792 793 794 795 796
	if (dcdc == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	dcdc->wm831x = wm831x;

797
	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
798
	if (res == NULL) {
799
		dev_err(&pdev->dev, "No REG resource\n");
800 801 802 803 804 805 806 807 808 809 810
		ret = -EINVAL;
		goto err;
	}
	dcdc->base = res->start;

	snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
	dcdc->desc.name = dcdc->name;
	dcdc->desc.id = id;
	dcdc->desc.type = REGULATOR_VOLTAGE;
	dcdc->desc.ops = &wm831x_boostp_ops;
	dcdc->desc.owner = THIS_MODULE;
811 812
	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
	dcdc->desc.enable_mask = 1 << id;
813

814
	config.dev = pdev->dev.parent;
815 816
	if (pdata)
		config.init_data = pdata->dcdc[id];
817
	config.driver_data = dcdc;
818
	config.regmap = wm831x->regmap;
819 820

	dcdc->regulator = regulator_register(&dcdc->desc, &config);
821 822 823 824 825 826 827
	if (IS_ERR(dcdc->regulator)) {
		ret = PTR_ERR(dcdc->regulator);
		dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
			id + 1, ret);
		goto err;
	}

828
	irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
829 830 831
	ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
				   IRQF_TRIGGER_RISING, dcdc->name,
				   dcdc);
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847
	if (ret != 0) {
		dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
			irq, ret);
		goto err_regulator;
	}

	platform_set_drvdata(pdev, dcdc);

	return 0;

err_regulator:
	regulator_unregister(dcdc->regulator);
err:
	return ret;
}

848
static int wm831x_boostp_remove(struct platform_device *pdev)
849 850 851
{
	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")),
		 dcdc);
856 857 858 859 860 861 862
	regulator_unregister(dcdc->regulator);

	return 0;
}

static struct platform_driver wm831x_boostp_driver = {
	.probe = wm831x_boostp_probe,
863
	.remove = wm831x_boostp_remove,
864 865
	.driver		= {
		.name	= "wm831x-boostp",
866
		.owner	= THIS_MODULE,
867 868 869
	},
};

870 871 872 873 874 875 876 877 878 879
/*
 * External Power Enable
 *
 * These aren't actually DCDCs but look like them in hardware so share
 * code.
 */

#define WM831X_EPE_BASE 6

static struct regulator_ops wm831x_epe_ops = {
880 881 882
	.is_enabled = regulator_is_enabled_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
883 884 885
	.get_status = wm831x_dcdc_get_status,
};

886
static int wm831x_epe_probe(struct platform_device *pdev)
887 888 889
{
	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
890
	struct regulator_config config = { };
891 892 893 894 895 896
	int id = pdev->id % ARRAY_SIZE(pdata->epe);
	struct wm831x_dcdc *dcdc;
	int ret;

	dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);

897
	dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL);
898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
	if (dcdc == NULL) {
		dev_err(&pdev->dev, "Unable to allocate private data\n");
		return -ENOMEM;
	}

	dcdc->wm831x = wm831x;

	/* For current parts this is correct; probably need to revisit
	 * in future.
	 */
	snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
	dcdc->desc.name = dcdc->name;
	dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
	dcdc->desc.ops = &wm831x_epe_ops;
	dcdc->desc.type = REGULATOR_VOLTAGE;
	dcdc->desc.owner = THIS_MODULE;
914 915
	dcdc->desc.enable_reg = WM831X_DCDC_ENABLE;
	dcdc->desc.enable_mask = 1 << dcdc->desc.id;
916

917
	config.dev = pdev->dev.parent;
918 919
	if (pdata)
		config.init_data = pdata->epe[id];
920
	config.driver_data = dcdc;
921
	config.regmap = wm831x->regmap;
922 923

	dcdc->regulator = regulator_register(&dcdc->desc, &config);
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
	if (IS_ERR(dcdc->regulator)) {
		ret = PTR_ERR(dcdc->regulator);
		dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
			id + 1, ret);
		goto err;
	}

	platform_set_drvdata(pdev, dcdc);

	return 0;

err:
	return ret;
}

939
static int wm831x_epe_remove(struct platform_device *pdev)
940 941 942
{
	struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);

943
	platform_set_drvdata(pdev, NULL);
944 945 946 947 948 949 950
	regulator_unregister(dcdc->regulator);

	return 0;
}

static struct platform_driver wm831x_epe_driver = {
	.probe = wm831x_epe_probe,
951
	.remove = wm831x_epe_remove,
952 953
	.driver		= {
		.name	= "wm831x-epe",
954
		.owner	= THIS_MODULE,
955 956 957
	},
};

958 959 960 961 962 963 964 965 966 967 968
static int __init wm831x_dcdc_init(void)
{
	int ret;
	ret = platform_driver_register(&wm831x_buckv_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);

	ret = platform_driver_register(&wm831x_buckp_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);

969 970 971 972
	ret = platform_driver_register(&wm831x_boostp_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x BOOST driver: %d\n", ret);

973 974 975 976
	ret = platform_driver_register(&wm831x_epe_driver);
	if (ret != 0)
		pr_err("Failed to register WM831x EPE driver: %d\n", ret);

977 978 979 980 981 982
	return 0;
}
subsys_initcall(wm831x_dcdc_init);

static void __exit wm831x_dcdc_exit(void)
{
983
	platform_driver_unregister(&wm831x_epe_driver);
984
	platform_driver_unregister(&wm831x_boostp_driver);
985 986 987 988 989 990 991 992 993 994 995
	platform_driver_unregister(&wm831x_buckp_driver);
	platform_driver_unregister(&wm831x_buckv_driver);
}
module_exit(wm831x_dcdc_exit);

/* Module information */
MODULE_AUTHOR("Mark Brown");
MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-buckv");
MODULE_ALIAS("platform:wm831x-buckp");
996
MODULE_ALIAS("platform:wm831x-boostp");
997
MODULE_ALIAS("platform:wm831x-epe");