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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>
This commit is contained in:
Henrique de Moraes Holschuh 2008-04-26 01:02:24 -03:00 committed by Len Brown
parent 4fa6811b8a
commit e306501d1c
2 changed files with 76 additions and 6 deletions
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25
Documentation/laptops/thinkpad-acpi.txt
View File

@ -693,16 +693,31 @@ while others are still having problems. For more information:
https://bugs.freedesktop.org/show_bug.cgi?id=2000
ThinkLight control -- /proc/acpi/ibm/light
------------------------------------------
ThinkLight control
------------------
The current status of the ThinkLight can be found in this file. A few
models which do not make the status available will show it as
"unknown". The available commands are:
procfs: /proc/acpi/ibm/light
sysfs attributes: as per led class, for the "tpacpi::thinklight" led
procfs notes:
The ThinkLight status can be read and set through the procfs interface. A
few models which do not make the status available will show the ThinkLight
status as "unknown". The available commands are:
echo on > /proc/acpi/ibm/light
echo off > /proc/acpi/ibm/light
sysfs notes:
The ThinkLight sysfs interface is documented by the led class
documentation, in Documentation/leds-class.txt. The ThinkLight led name
is "tpacpi::thinklight".
Due to limitations in the sysfs led class, if the status of the thinklight
cannot be read or if it is unknown, thinkpad-acpi will report it as "off".
It is impossible to know if the status returned through sysfs is valid.
Docking / undocking -- /proc/acpi/ibm/dock
------------------------------------------

57
drivers/misc/thinkpad_acpi.c
View File

@ -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,
};
/*************************************************************************