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use mutex instead of semaphore in hdaps driver

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The hdaps driver uses a semaphore as mutex.  Use the mutex API instead of the
(binary) semaphore.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Cc: Robert Love <rlove@rlove.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthias Kaehlcke 2007-05-08 00:32:05 -07:00 • committed by Linus Torvalds
parent d081d47044
commit 6acc369a43
1 changed files with 20 additions and 18 deletions
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38
drivers/hwmon/hdaps.c
View file

@ -30,10 +30,12 @@
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/input.h> #include <linux/input.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/mutex.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/timer.h> #include <linux/timer.h>
#include <linux/dmi.h> #include <linux/dmi.h>
#include <linux/jiffies.h> #include <linux/jiffies.h>
#include <asm/io.h> #include <asm/io.h>
#define HDAPS_LOW_PORT 0x1600 /* first port used by hdaps */ #define HDAPS_LOW_PORT 0x1600 /* first port used by hdaps */
@ -71,10 +73,10 @@ static u8 km_activity;
static int rest_x; static int rest_x;
static int rest_y; static int rest_y;
static DECLARE_MUTEX(hdaps_sem); static DEFINE_MUTEX(hdaps_mtx);
/* /*
* __get_latch - Get the value from a given port. Callers must hold hdaps_sem. * __get_latch - Get the value from a given port. Callers must hold hdaps_mtx.
*/ */
static inline u8 __get_latch(u16 port) static inline u8 __get_latch(u16 port)
{ {
@ -83,7 +85,7 @@ static inline u8 __get_latch(u16 port)
/* /*
* __check_latch - Check a port latch for a given value. Returns zero if the * __check_latch - Check a port latch for a given value. Returns zero if the
* port contains the given value. Callers must hold hdaps_sem. * port contains the given value. Callers must hold hdaps_mtx.
*/ */
static inline int __check_latch(u16 port, u8 val) static inline int __check_latch(u16 port, u8 val)
{ {
@ -94,7 +96,7 @@ static inline int __check_latch(u16 port, u8 val)
/* /*
* __wait_latch - Wait up to 100us for a port latch to get a certain value, * __wait_latch - Wait up to 100us for a port latch to get a certain value,
* returning zero if the value is obtained. Callers must hold hdaps_sem. * returning zero if the value is obtained. Callers must hold hdaps_mtx.
*/ */
static int __wait_latch(u16 port, u8 val) static int __wait_latch(u16 port, u8 val)
{ {
@ -111,7 +113,7 @@ static int __wait_latch(u16 port, u8 val)
/* /*
* __device_refresh - request a refresh from the accelerometer. Does not wait * __device_refresh - request a refresh from the accelerometer. Does not wait
* for refresh to complete. Callers must hold hdaps_sem. * for refresh to complete. Callers must hold hdaps_mtx.
*/ */
static void __device_refresh(void) static void __device_refresh(void)
{ {
@ -125,7 +127,7 @@ static void __device_refresh(void)
/* /*
* __device_refresh_sync - request a synchronous refresh from the * __device_refresh_sync - request a synchronous refresh from the
* accelerometer. We wait for the refresh to complete. Returns zero if * accelerometer. We wait for the refresh to complete. Returns zero if
* successful and nonzero on error. Callers must hold hdaps_sem. * successful and nonzero on error. Callers must hold hdaps_mtx.
*/ */
static int __device_refresh_sync(void) static int __device_refresh_sync(void)
{ {
@ -135,7 +137,7 @@ static int __device_refresh_sync(void)
/* /*
* __device_complete - indicate to the accelerometer that we are done reading * __device_complete - indicate to the accelerometer that we are done reading
* data, and then initiate an async refresh. Callers must hold hdaps_sem. * data, and then initiate an async refresh. Callers must hold hdaps_mtx.
*/ */
static inline void __device_complete(void) static inline void __device_complete(void)
{ {
@ -153,7 +155,7 @@ static int hdaps_readb_one(unsigned int port, u8 *val)
{ {
int ret; int ret;
down(&hdaps_sem); mutex_lock(&hdaps_mtx);
/* do a sync refresh -- we need to be sure that we read fresh data */ /* do a sync refresh -- we need to be sure that we read fresh data */
ret = __device_refresh_sync(); ret = __device_refresh_sync();
@ -164,7 +166,7 @@ static int hdaps_readb_one(unsigned int port, u8 *val)
__device_complete(); __device_complete();
out: out:
up(&hdaps_sem); mutex_unlock(&hdaps_mtx);
return ret; return ret;
} }
@ -199,9 +201,9 @@ static int hdaps_read_pair(unsigned int port1, unsigned int port2,
{ {
int ret; int ret;
down(&hdaps_sem); mutex_lock(&hdaps_mtx);
ret = __hdaps_read_pair(port1, port2, val1, val2); ret = __hdaps_read_pair(port1, port2, val1, val2);
up(&hdaps_sem); mutex_unlock(&hdaps_mtx);
return ret; return ret;
} }
@ -214,7 +216,7 @@ static int hdaps_device_init(void)
{ {
int total, ret = -ENXIO; int total, ret = -ENXIO;
down(&hdaps_sem); mutex_lock(&hdaps_mtx);
outb(0x13, 0x1610); outb(0x13, 0x1610);
outb(0x01, 0x161f); outb(0x01, 0x161f);
@ -280,7 +282,7 @@ static int hdaps_device_init(void)
} }
out: out:
up(&hdaps_sem); mutex_unlock(&hdaps_mtx);
return ret; return ret;
} }
@ -314,7 +316,7 @@ static struct platform_driver hdaps_driver = {
}; };
/* /*
* hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_sem. * hdaps_calibrate - Set our "resting" values. Callers must hold hdaps_mtx.
*/ */
static void hdaps_calibrate(void) static void hdaps_calibrate(void)
{ {
@ -326,7 +328,7 @@ static void hdaps_mousedev_poll(unsigned long unused)
int x, y; int x, y;
/* Cannot sleep. Try nonblockingly. If we fail, try again later. */ /* Cannot sleep. Try nonblockingly. If we fail, try again later. */
if (down_trylock(&hdaps_sem)) { if (mutex_trylock(&hdaps_mtx)) {
mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD); mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD);
return; return;
} }
@ -341,7 +343,7 @@ static void hdaps_mousedev_poll(unsigned long unused)
mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD); mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
out: out:
up(&hdaps_sem); mutex_unlock(&hdaps_mtx);
} }
@ -421,9 +423,9 @@ static ssize_t hdaps_calibrate_store(struct device *dev,
struct device_attribute *attr, struct device_attribute *attr,
const char *buf, size_t count) const char *buf, size_t count)
{ {
down(&hdaps_sem); mutex_lock(&hdaps_mtx);
hdaps_calibrate(); hdaps_calibrate();
up(&hdaps_sem); mutex_unlock(&hdaps_mtx);
return count; return count;
} }