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hwmon: applesmc: allow for variable ALV0 and ALV1 package length 

On some recent Macbooks, the package length for the light sensors ALV0 and
ALV1 has changed from 6 to 10.  This patch allows for a variable package
length encompassing both variants.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Cc: Nicolas Boichat <nicolas@boichat.ch>
Cc: Riki Oktarianto <rkoktarianto@gmail.com>
Cc: Mark M. Hoffman <mhoffman@lightlink.com>
Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Henrik Rydberg 2008-10-18 20:27:39 -07:00 committed by Linus Torvalds
parent 02fcbd144d
commit 8bd1a12a51
1 changed files with 15 additions and 5 deletions
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20
drivers/hwmon/applesmc.c
View File

@ -57,8 +57,8 @@
#define KEY_COUNT_KEY "#KEY" /* r-o ui32 */
#define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6 bytes) */
#define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6 bytes) */
#define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6-10 bytes) */
#define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6-10 bytes) */
#define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */
#define CLAMSHELL_KEY "MSLD" /* r-o ui8 (unused) */
@ -543,17 +543,27 @@ out:
static ssize_t applesmc_light_show(struct device *dev,
struct device_attribute *attr, char *sysfsbuf)
{
static int data_length;
int ret;
u8 left = 0, right = 0;
u8 buffer[6];
u8 buffer[10], query[6];
mutex_lock(&applesmc_lock);
ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, 6);
if (!data_length) {
ret = applesmc_get_key_type(LIGHT_SENSOR_LEFT_KEY, query);
if (ret)
goto out;
data_length = clamp_val(query[0], 0, 10);
printk(KERN_INFO "applesmc: light sensor data length set to "
"%d\n", data_length);
}
ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
left = buffer[2];
if (ret)
goto out;
ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, 6);
ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
right = buffer[2];
out: