From 8bd1a12a51871f0c870612d8220b1485d6aefc73 Mon Sep 17 00:00:00 2001 From: Henrik Rydberg Date: Sat, 18 Oct 2008 20:27:39 -0700 Subject: 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 Cc: Nicolas Boichat Cc: Riki Oktarianto Cc: Mark M. Hoffman Cc: Jean Delvare Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/hwmon/applesmc.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c index 9a43c4b60ea..de696b67a4f 100644 --- a/drivers/hwmon/applesmc.c +++ b/drivers/hwmon/applesmc.c @@ -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: -- cgit v1.2.3-18-g5258