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eeepc-wmi: add touchpad led support

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Most of the code comes from eeepc-laptop.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Corentin Chary 2010-11-29 08:14:06 +01:00 committed by Matthew Garrett
parent 27c136c873
commit 084fca6312
2 changed files with 115 additions and 0 deletions
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2
drivers/platform/x86/Kconfig
View File

@ -426,6 +426,8 @@ config EEEPC_WMI
depends on EXPERIMENTAL
depends on BACKLIGHT_CLASS_DEVICE
select INPUT_SPARSEKMAP
select LEDS_CLASS
select NEW_LEDS
---help---
Say Y here if you want to support WMI-based hotkeys on Eee PC laptops.

113
drivers/platform/x86/eeepc-wmi.c
View File

@ -34,6 +34,7 @@
#include <linux/input/sparse-keymap.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@ -60,6 +61,7 @@ MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
#define EEEPC_WMI_METHODID_CFVS 0x53564643
#define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012
#define EEEPC_WMI_DEVID_TPDLED 0x00100011
static const struct key_entry eeepc_wmi_keymap[] = {
/* Sleep already handled via generic ACPI code */
@ -87,6 +89,11 @@ struct eeepc_wmi {
struct input_dev *inputdev;
struct backlight_device *backlight_device;
struct platform_device *platform_device;
struct led_classdev tpd_led;
int tpd_led_wk;
struct workqueue_struct *led_workqueue;
struct work_struct tpd_led_work;
};
/* Only used in eeepc_wmi_init() and eeepc_wmi_exit() */
@ -176,6 +183,105 @@ static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
return status;
}
/*
* LEDs
*/
/*
* These functions actually update the LED's, and are called from a
* workqueue. By doing this as separate work rather than when the LED
* subsystem asks, we avoid messing with the Eeepc ACPI stuff during a
* potentially bad time, such as a timer interrupt.
*/
static void tpd_led_update(struct work_struct *work)
{
int ctrl_param;
struct eeepc_wmi *eeepc;
eeepc = container_of(work, struct eeepc_wmi, tpd_led_work);
ctrl_param = eeepc->tpd_led_wk;
eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_TPDLED, ctrl_param);
}
static void tpd_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct eeepc_wmi *eeepc;
eeepc = container_of(led_cdev, struct eeepc_wmi, tpd_led);
eeepc->tpd_led_wk = !!value;
queue_work(eeepc->led_workqueue, &eeepc->tpd_led_work);
}
static int read_tpd_state(struct eeepc_wmi *eeepc)
{
static u32 ctrl_param;
acpi_status status;
status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_TPDLED, &ctrl_param);
if (ACPI_FAILURE(status))
return -1;
else if (!ctrl_param || ctrl_param == 0x00060000)
/*
* if touchpad led is present, DSTS will set some bits,
* usually 0x00020000.
* 0x00060000 means that the device is not supported
*/
return -ENODEV;
else
/* Status is stored in the first bit */
return ctrl_param & 0x1;
}
static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
{
struct eeepc_wmi *eeepc;
eeepc = container_of(led_cdev, struct eeepc_wmi, tpd_led);
return read_tpd_state(eeepc);
}
static int eeepc_wmi_led_init(struct eeepc_wmi *eeepc)
{
int rv;
if (read_tpd_state(eeepc) < 0)
return 0;
eeepc->led_workqueue = create_singlethread_workqueue("led_workqueue");
if (!eeepc->led_workqueue)
return -ENOMEM;
INIT_WORK(&eeepc->tpd_led_work, tpd_led_update);
eeepc->tpd_led.name = "eeepc::touchpad";
eeepc->tpd_led.brightness_set = tpd_led_set;
eeepc->tpd_led.brightness_get = tpd_led_get;
eeepc->tpd_led.max_brightness = 1;
rv = led_classdev_register(&eeepc->platform_device->dev,
&eeepc->tpd_led);
if (rv) {
destroy_workqueue(eeepc->led_workqueue);
return rv;
}
return 0;
}
static void eeepc_wmi_led_exit(struct eeepc_wmi *eeepc)
{
if (eeepc->tpd_led.dev)
led_classdev_unregister(&eeepc->tpd_led);
if (eeepc->led_workqueue)
destroy_workqueue(eeepc->led_workqueue);
}
/*
* Backlight
*/
static int read_brightness(struct backlight_device *bd)
{
static u32 ctrl_param;
@ -402,6 +508,10 @@ static struct platform_device * __init eeepc_wmi_add(void)
if (err)
goto fail_input;
err = eeepc_wmi_led_init(eeepc);
if (err)
goto fail_leds;
if (!acpi_video_backlight_support()) {
err = eeepc_wmi_backlight_init(eeepc);
if (err)
@ -423,6 +533,8 @@ static struct platform_device * __init eeepc_wmi_add(void)
fail_wmi_handler:
eeepc_wmi_backlight_exit(eeepc);
fail_backlight:
eeepc_wmi_led_exit(eeepc);
fail_leds:
eeepc_wmi_input_exit(eeepc);
fail_input:
eeepc_wmi_platform_exit(eeepc);
@ -439,6 +551,7 @@ static int eeepc_wmi_remove(struct platform_device *device)
wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
eeepc_wmi_backlight_exit(eeepc);
eeepc_wmi_input_exit(eeepc);
eeepc_wmi_led_exit(eeepc);
eeepc_wmi_platform_exit(eeepc);
kfree(eeepc);