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mfd: Use completion interrupt for WM835x AUXADC 

Use the completion interrupt generated by the device rather than
polling for conversions to complete. As a backup we still check
the state of the AUXADC if we don't get a completion, mostly for
systems that don't have the WM8350 interrupt infrastructure hooked
up.

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 2010-02-23 11:08:05 +00:00 committed by Samuel Ortiz
parent 11a441ce82
commit d19663ac61
2 changed files with 31 additions and 6 deletions
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35
drivers/mfd/wm8350-core.c
View File

@ -339,7 +339,6 @@ EXPORT_SYMBOL_GPL(wm8350_reg_unlock);
int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
{
u16 reg, result = 0;
int tries = 5;
if (channel < WM8350_AUXADC_AUX1 || channel > WM8350_AUXADC_TEMP)
return -EINVAL;
@ -363,12 +362,13 @@ int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
reg |= 1 << channel | WM8350_AUXADC_POLL;
wm8350_reg_write(wm8350, WM8350_DIGITISER_CONTROL_1, reg);
do {
schedule_timeout_interruptible(1);
reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
} while ((reg & WM8350_AUXADC_POLL) && --tries);
/* We ignore the result of the completion and just check for a
* conversion result, allowing us to soldier on if the IRQ
* infrastructure is not set up for the chip. */
wait_for_completion_timeout(&wm8350->auxadc_done, msecs_to_jiffies(5));
if (!tries)
reg = wm8350_reg_read(wm8350, WM8350_DIGITISER_CONTROL_1);
if (reg & WM8350_AUXADC_POLL)
dev_err(wm8350->dev, "adc chn %d read timeout\n", channel);
else
result = wm8350_reg_read(wm8350,
@ -385,6 +385,15 @@ int wm8350_read_auxadc(struct wm8350 *wm8350, int channel, int scale, int vref)
}
EXPORT_SYMBOL_GPL(wm8350_read_auxadc);
static irqreturn_t wm8350_auxadc_irq(int irq, void *irq_data)
{
struct wm8350 *wm8350 = irq_data;
complete(&wm8350->auxadc_done);
return IRQ_HANDLED;
}
/*
* Cache is always host endian.
*/
@ -682,11 +691,22 @@ int wm8350_device_init(struct wm8350 *wm8350, int irq,
}
mutex_init(&wm8350->auxadc_mutex);
init_completion(&wm8350->auxadc_done);
ret = wm8350_irq_init(wm8350, irq, pdata);
if (ret < 0)
goto err;
if (wm8350->irq_base) {
ret = request_threaded_irq(wm8350->irq_base +
WM8350_IRQ_AUXADC_DATARDY,
NULL, wm8350_auxadc_irq, 0,
"auxadc", wm8350);
if (ret < 0)
dev_warn(wm8350->dev,
"Failed to request AUXADC IRQ: %d\n", ret);
}
if (pdata && pdata->init) {
ret = pdata->init(wm8350);
if (ret != 0) {
@ -736,6 +756,9 @@ void wm8350_device_exit(struct wm8350 *wm8350)
platform_device_unregister(wm8350->gpio.pdev);
platform_device_unregister(wm8350->codec.pdev);
if (wm8350->irq_base)
free_irq(wm8350->irq_base + WM8350_IRQ_AUXADC_DATARDY, wm8350);
wm8350_irq_exit(wm8350);
kfree(wm8350->reg_cache);

2
include/linux/mfd/wm8350/core.h
View File

@ -16,6 +16,7 @@
#include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/mfd/wm8350/audio.h>
#include <linux/mfd/wm8350/gpio.h>
@ -621,6 +622,7 @@ struct wm8350 {
u16 *reg_cache;
struct mutex auxadc_mutex;
struct completion auxadc_done;
/* Interrupt handling */
struct mutex irq_lock;