From 084fca63128849c0961b3cfdb0cd0345e8f51ad8 Mon Sep 17 00:00:00 2001 From: Corentin Chary Date: Mon, 29 Nov 2010 08:14:06 +0100 Subject: eeepc-wmi: add touchpad led support Most of the code comes from eeepc-laptop. Signed-off-by: Corentin Chary Signed-off-by: Matthew Garrett diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 65ba620..adcdbbd 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -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. 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 #include #include +#include #include #include #include @@ -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); -- cgit v0.10.2