eeepc-wmi: add touchpad led support
Most of the code comes from eeepc-laptop.
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
index dfbb295..f12a25d 100644
--- a/drivers/platform/x86/eeepc-wmi.c
+++ b/drivers/platform/x86/eeepc-wmi.c
@@ -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 @@
#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 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 @@
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 @@
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 @@
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 @@
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);