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mfd: Support software initiated shutdown of WM831x PMICs

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In systems where there is no hardware signal from the processor to the
PMIC to initiate the final power off sequence we must initiate the
shutdown with a register write to the PMIC. Support such systems in the
driver. Since this may prevent a full shutdown of the system platform
data is used to enable the feature.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown 2011-09-15 18:54:53 +02:00 committed by Samuel Ortiz
parent f09ee0451a
commit 5da721c87a
5 changed files with 33 additions and 0 deletions
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11
drivers/mfd/wm831x-core.c
View File

@ -24,6 +24,7 @@
#include <linux/mfd/wm831x/irq.h>
#include <linux/mfd/wm831x/auxadc.h>
#include <linux/mfd/wm831x/otp.h>
#include <linux/mfd/wm831x/pmu.h>
#include <linux/mfd/wm831x/regulator.h>
/* Current settings - values are 2*2^(reg_val/4) microamps. These are
@ -1305,6 +1306,7 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
mutex_init(&wm831x->io_lock);
mutex_init(&wm831x->key_lock);
dev_set_drvdata(wm831x->dev, wm831x);
wm831x->soft_shutdown = pdata->soft_shutdown;
ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
if (ret < 0) {
@ -1604,6 +1606,15 @@ int wm831x_device_suspend(struct wm831x *wm831x)
return 0;
}
void wm831x_device_shutdown(struct wm831x *wm831x)
{
if (wm831x->soft_shutdown) {
dev_info(wm831x->dev, "Initiating shutdown...\n");
wm831x_set_bits(wm831x, WM831X_POWER_STATE, WM831X_CHIP_ON, 0);
}
}
EXPORT_SYMBOL_GPL(wm831x_device_shutdown);
MODULE_DESCRIPTION("Core support for the WM831X AudioPlus PMIC");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown");

8
drivers/mfd/wm831x-i2c.c
View File

@ -109,6 +109,13 @@ static int wm831x_i2c_suspend(struct device *dev)
return wm831x_device_suspend(wm831x);
}
static void wm831x_i2c_shutdown(struct i2c_client *i2c)
{
struct wm831x *wm831x = i2c_get_clientdata(i2c);
wm831x_device_shutdown(wm831x);
}
static const struct i2c_device_id wm831x_i2c_id[] = {
{ "wm8310", WM8310 },
{ "wm8311", WM8311 },
@ -133,6 +140,7 @@ static struct i2c_driver wm831x_i2c_driver = {
},
.probe = wm831x_i2c_probe,
.remove = wm831x_i2c_remove,
.shutdown = wm831x_i2c_shutdown,
.id_table = wm831x_i2c_id,
};

8
drivers/mfd/wm831x-spi.c
View File

@ -121,6 +121,13 @@ static int wm831x_spi_suspend(struct device *dev)
return wm831x_device_suspend(wm831x);
}
static void wm831x_spi_shutdown(struct spi_device *spi)
{
struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
wm831x_device_shutdown(wm831x);
}
static const struct dev_pm_ops wm831x_spi_pm = {
.freeze = wm831x_spi_suspend,
.suspend = wm831x_spi_suspend,
@ -146,6 +153,7 @@ static struct spi_driver wm8311_spi_driver = {
},
.probe = wm831x_spi_probe,
.remove = __devexit_p(wm831x_spi_remove),
.shutdown = wm831x_spi_shutdown,
};
static struct spi_driver wm8312_spi_driver = {

3
include/linux/mfd/wm831x/core.h
View File

@ -374,6 +374,8 @@ struct wm831x {
int irq_masks_cur[WM831X_NUM_IRQ_REGS]; /* Currently active value */
int irq_masks_cache[WM831X_NUM_IRQ_REGS]; /* Cached hardware value */
bool soft_shutdown;
/* Chip revision based flags */
unsigned has_gpio_ena:1; /* Has GPIO enable bit */
unsigned has_cs_sts:1; /* Has current sink status bit */
@ -412,6 +414,7 @@ int wm831x_bulk_read(struct wm831x *wm831x, unsigned short reg,
int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq);
void wm831x_device_exit(struct wm831x *wm831x);
int wm831x_device_suspend(struct wm831x *wm831x);
void wm831x_device_shutdown(struct wm831x *wm831x);
int wm831x_irq_init(struct wm831x *wm831x, int irq);
void wm831x_irq_exit(struct wm831x *wm831x);
void wm831x_auxadc_init(struct wm831x *wm831x);

3
include/linux/mfd/wm831x/pdata.h
View File

@ -123,6 +123,9 @@ struct wm831x_pdata {
/** Disable the touchscreen */
bool disable_touch;
/** The driver should initiate a power off sequence during shutdown */
bool soft_shutdown;
int irq_base;
int gpio_base;
int gpio_defaults[WM831X_GPIO_NUM];