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linux/drivers/regulator/wm831x-dcdc.c
Mark Brown 88cda60e51 regulator: Improve WM831x DVS VSEL selection algorithm 
Rather than using the maximum voltage we get passed to select the DVS
voltage to use remember the highest voltage we've ever seen. This improves
how the driver works when the consumer permits higher voltages than it
will ever selects in order to support the widest possible voltage range.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2011-07-28 10:20:49 +01:00

1053 lines
26 KiB
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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>
#include <linux/regulator/machine.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#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
#define WM831X_DCDC_MAX_NAME 6
/* 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
#define WM831X_DCDC_DVS_CONTROL 4
/*
* Shared
*/
struct wm831x_dcdc {
char name[WM831X_DCDC_MAX_NAME];
struct regulator_desc desc;
int base;
struct wm831x *wm831x;
struct regulator_dev *regulator;
int dvs_gpio;
int dvs_gpio_state;
int on_vsel;
int dvs_vsel;
};
static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
int mask = 1 << rdev_get_id(rdev);
int reg;
reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
if (reg < 0)
return reg;
if (reg & mask)
return 1;
else
return 0;
}
static int wm831x_dcdc_enable(struct regulator_dev *rdev)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
int mask = 1 << rdev_get_id(rdev);
return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
}
static int wm831x_dcdc_disable(struct regulator_dev *rdev)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
int mask = 1 << rdev_get_id(rdev);
return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
}
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();
return -EINVAL;
}
}
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;
}
static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
u16 vsel;
if (min_uV < 600000)
vsel = 0;
else if (min_uV <= 1800000)
vsel = ((min_uV - 600000) / 12500) + 8;
else
return -EINVAL;
if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
return -EINVAL;
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;
}
static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV, unsigned *selector)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
int vsel, ret;
vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
if (vsel < 0)
return vsel;
*selector = vsel;
/* 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;
/*
* 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,
dcdc->dvs_vsel);
if (ret == 0)
dcdc->dvs_vsel = vsel;
else
dev_warn(wm831x->dev,
"Failed to set DCDC DVS VSEL: %d\n", ret);
}
return 0;
}
static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
int uV)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
int vsel;
vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
if (vsel < 0)
return vsel;
return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
}
static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
return dcdc->dvs_vsel;
else
return dcdc->on_vsel;
}
/* 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;
for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
if (max_uA <= wm831x_dcdc_ilim[i])
break;
}
if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
return -EINVAL;
return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
}
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;
return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
}
static struct regulator_ops wm831x_buckv_ops = {
.set_voltage = wm831x_buckv_set_voltage,
.get_voltage_sel = wm831x_buckv_get_voltage_sel,
.list_voltage = wm831x_buckv_list_voltage,
.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
.set_current_limit = wm831x_buckv_set_current_limit,
.get_current_limit = wm831x_buckv_get_current_limit,
.is_enabled = wm831x_dcdc_is_enabled,
.enable = wm831x_dcdc_enable,
.disable = wm831x_dcdc_disable,
.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,
};
/*
* Set up DVS control. We just log errors since we can still run
* (with reduced performance) if we fail.
*/
static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
struct wm831x_buckv_pdata *pdata)
{
struct wm831x *wm831x = dcdc->wm831x;
int ret;
u16 ctrl;
if (!pdata || !pdata->dvs_gpio)
return;
ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
if (ret < 0) {
dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
dcdc->name, ret);
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;
ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
if (ret < 0) {
dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
dcdc->name, ret);
gpio_free(pdata->dvs_gpio);
return;
}
dcdc->dvs_gpio = pdata->dvs_gpio;
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;
}
/* 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);
}
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);
}
}
static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
int id;
struct wm831x_dcdc *dcdc;
struct resource *res;
int ret, irq;
if (pdata && pdata->wm831x_num)
id = (pdata->wm831x_num * 10) + 1;
else
id = 0;
id = pdev->id - id;
dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
if (pdata == NULL || pdata->dcdc[id] == NULL)
return -ENODEV;
dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
if (dcdc == NULL) {
dev_err(&pdev->dev, "Unable to allocate private data\n");
return -ENOMEM;
}
dcdc->wm831x = wm831x;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No I/O resource\n");
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.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
dcdc->desc.ops = &wm831x_buckv_ops;
dcdc->desc.owner = THIS_MODULE;
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;
ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL);
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;
if (pdata->dcdc[id])
wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
pdata->dcdc[id], dcdc);
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;
}
irq = platform_get_irq_byname(pdev, "UV");
ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
IRQF_TRIGGER_RISING, dcdc->name, dcdc);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
irq, ret);
goto err_regulator;
}
irq = platform_get_irq_byname(pdev, "HC");
ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq,
IRQF_TRIGGER_RISING, dcdc->name, dcdc);
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:
free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
err_regulator:
regulator_unregister(dcdc->regulator);
err:
if (dcdc->dvs_gpio)
gpio_free(dcdc->dvs_gpio);
kfree(dcdc);
return ret;
}
static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
{
struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
free_irq(platform_get_irq_byname(pdev, "HC"), dcdc);
free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
regulator_unregister(dcdc->regulator);
if (dcdc->dvs_gpio)
gpio_free(dcdc->dvs_gpio);
kfree(dcdc);
return 0;
}
static struct platform_driver wm831x_buckv_driver = {
.probe = wm831x_buckv_probe,
.remove = __devexit_p(wm831x_buckv_remove),
.driver = {
.name = "wm831x-buckv",
.owner = THIS_MODULE,
},
};
/*
* BUCKP specifics
*/
static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
unsigned selector)
{
if (selector <= WM831X_BUCKP_MAX_SELECTOR)
return 850000 + (selector * 25000);
else
return -EINVAL;
}
static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
int min_uV, int max_uV, int *selector)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
u16 vsel;
if (min_uV <= 34000000)
vsel = (min_uV - 850000) / 25000;
else
return -EINVAL;
if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
return -EINVAL;
*selector = vsel;
return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
}
static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV,
unsigned *selector)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV,
selector);
}
static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
int uV)
{
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
unsigned selector;
return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector);
}
static int wm831x_buckp_get_voltage_sel(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;
return val & WM831X_DC3_ON_VSEL_MASK;
}
static struct regulator_ops wm831x_buckp_ops = {
.set_voltage = wm831x_buckp_set_voltage,
.get_voltage_sel = wm831x_buckp_get_voltage_sel,
.list_voltage = wm831x_buckp_list_voltage,
.set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
.is_enabled = wm831x_dcdc_is_enabled,
.enable = wm831x_dcdc_enable,
.disable = wm831x_dcdc_disable,
.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,
};
static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
int id;
struct wm831x_dcdc *dcdc;
struct resource *res;
int ret, irq;
if (pdata && pdata->wm831x_num)
id = (pdata->wm831x_num * 10) + 1;
else
id = 0;
id = pdev->id - id;
dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
if (pdata == NULL || pdata->dcdc[id] == NULL)
return -ENODEV;
dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
if (dcdc == NULL) {
dev_err(&pdev->dev, "Unable to allocate private data\n");
return -ENOMEM;
}
dcdc->wm831x = wm831x;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No I/O resource\n");
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.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
dcdc->desc.ops = &wm831x_buckp_ops;
dcdc->desc.owner = THIS_MODULE;
dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
pdata->dcdc[id], dcdc);
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;
}
irq = platform_get_irq_byname(pdev, "UV");
ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
IRQF_TRIGGER_RISING, dcdc->name, dcdc);
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:
kfree(dcdc);
return ret;
}
static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
{
struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
regulator_unregister(dcdc->regulator);
kfree(dcdc);
return 0;
}
static struct platform_driver wm831x_buckp_driver = {
.probe = wm831x_buckp_probe,
.remove = __devexit_p(wm831x_buckp_remove),
.driver = {
.name = "wm831x-buckp",
.owner = THIS_MODULE,
},
};
/*
* 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,
.is_enabled = wm831x_dcdc_is_enabled,
.enable = wm831x_dcdc_enable,
.disable = wm831x_dcdc_disable,
};
static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
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;
dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
if (dcdc == NULL) {
dev_err(&pdev->dev, "Unable to allocate private data\n");
return -ENOMEM;
}
dcdc->wm831x = wm831x;
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (res == NULL) {
dev_err(&pdev->dev, "No I/O resource\n");
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;
dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
pdata->dcdc[id], dcdc);
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;
}
irq = platform_get_irq_byname(pdev, "UV");
ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq,
IRQF_TRIGGER_RISING, dcdc->name,
dcdc);
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:
kfree(dcdc);
return ret;
}
static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
{
struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
free_irq(platform_get_irq_byname(pdev, "UV"), dcdc);
regulator_unregister(dcdc->regulator);
kfree(dcdc);
return 0;
}
static struct platform_driver wm831x_boostp_driver = {
.probe = wm831x_boostp_probe,
.remove = __devexit_p(wm831x_boostp_remove),
.driver = {
.name = "wm831x-boostp",
.owner = THIS_MODULE,
},
};
/*
* 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 = {
.is_enabled = wm831x_dcdc_is_enabled,
.enable = wm831x_dcdc_enable,
.disable = wm831x_dcdc_disable,
.get_status = wm831x_dcdc_get_status,
};
static __devinit int wm831x_epe_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
int id = pdev->id % ARRAY_SIZE(pdata->epe);
struct wm831x_dcdc *dcdc;
int ret;
dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
if (pdata == NULL || pdata->epe[id] == NULL)
return -ENODEV;
dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
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;
dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
pdata->epe[id], dcdc);
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:
kfree(dcdc);
return ret;
}
static __devexit int wm831x_epe_remove(struct platform_device *pdev)
{
struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
regulator_unregister(dcdc->regulator);
kfree(dcdc);
return 0;
}
static struct platform_driver wm831x_epe_driver = {
.probe = wm831x_epe_probe,
.remove = __devexit_p(wm831x_epe_remove),
.driver = {
.name = "wm831x-epe",
.owner = THIS_MODULE,
},
};
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);
ret = platform_driver_register(&wm831x_boostp_driver);
if (ret != 0)
pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
ret = platform_driver_register(&wm831x_epe_driver);
if (ret != 0)
pr_err("Failed to register WM831x EPE driver: %d\n", ret);
return 0;
}
subsys_initcall(wm831x_dcdc_init);
static void __exit wm831x_dcdc_exit(void)
{
platform_driver_unregister(&wm831x_epe_driver);
platform_driver_unregister(&wm831x_boostp_driver);
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");
MODULE_ALIAS("platform:wm831x-epe");
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