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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2008-04-26 01:02:24 -0300
committerLen Brown <len.brown@intel.com>2008-04-29 09:47:01 -0400
commite306501d1c4ff610feaba74ac35dd13e470480e6 (patch)
tree7d259445d984c8a4a69dd59121475deb01c84a6a /drivers/misc
parent4fa6811b8ade1b7839342824939817a8fc751539 (diff)
ACPI: thinkpad-acpi: add sysfs led class support for thinklight (v3.1)
Add a sysfs led class interface to the thinklight (light subdriver). Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/thinkpad_acpi.c57
1 files changed, 56 insertions, 1 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 5a3fb09f10d..38a119bd931 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -3280,13 +3280,49 @@ static int light_set_status(int status)
return -ENXIO;
}
+static void light_set_status_worker(struct work_struct *work)
+{
+ struct tpacpi_led_classdev *data =
+ container_of(work, struct tpacpi_led_classdev, work);
+
+ if (likely(tpacpi_lifecycle == TPACPI_LIFE_RUNNING))
+ light_set_status((data->new_brightness != LED_OFF));
+}
+
+static void light_sysfs_set(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct tpacpi_led_classdev *data =
+ container_of(led_cdev,
+ struct tpacpi_led_classdev,
+ led_classdev);
+ data->new_brightness = brightness;
+ schedule_work(&data->work);
+}
+
+static enum led_brightness light_sysfs_get(struct led_classdev *led_cdev)
+{
+ return (light_get_status() == 1)? LED_FULL : LED_OFF;
+}
+
+static struct tpacpi_led_classdev tpacpi_led_thinklight = {
+ .led_classdev = {
+ .name = "tpacpi::thinklight",
+ .brightness_set = &light_sysfs_set,
+ .brightness_get = &light_sysfs_get,
+ }
+};
+
static int __init light_init(struct ibm_init_struct *iibm)
{
+ int rc = 0;
+
vdbg_printk(TPACPI_DBG_INIT, "initializing light subdriver\n");
TPACPI_ACPIHANDLE_INIT(ledb);
TPACPI_ACPIHANDLE_INIT(lght);
TPACPI_ACPIHANDLE_INIT(cmos);
+ INIT_WORK(&tpacpi_led_thinklight.work, light_set_status_worker);
/* light not supported on 570, 600e/x, 770e, 770x, G4x, R30, R31 */
tp_features.light = (cmos_handle || lght_handle) && !ledb_handle;
@@ -3300,7 +3336,25 @@ static int __init light_init(struct ibm_init_struct *iibm)
vdbg_printk(TPACPI_DBG_INIT, "light is %s\n",
str_supported(tp_features.light));
- return (tp_features.light)? 0 : 1;
+ if (tp_features.light) {
+ rc = led_classdev_register(&tpacpi_pdev->dev,
+ &tpacpi_led_thinklight.led_classdev);
+ }
+
+ if (rc < 0) {
+ tp_features.light = 0;
+ tp_features.light_status = 0;
+ } else {
+ rc = (tp_features.light)? 0 : 1;
+ }
+ return rc;
+}
+
+static void light_exit(void)
+{
+ led_classdev_unregister(&tpacpi_led_thinklight.led_classdev);
+ if (work_pending(&tpacpi_led_thinklight.work))
+ flush_scheduled_work();
}
static int light_read(char *p)
@@ -3348,6 +3402,7 @@ static struct ibm_struct light_driver_data = {
.name = "light",
.read = light_read,
.write = light_write,
+ .exit = light_exit,
};
/*************************************************************************