Add backlight support for WMI based Eee PC laptops.
Signed-off-by: Yong Wang <yong.y.wang@xxxxxxxxx>
---
drivers/platform/x86/eeepc-wmi.c | 170 +++++++++++++++++++++++++++++++++++++-
1 files changed, 167 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
index 0f5ab6a..784687c 100644
--- a/drivers/platform/x86/eeepc-wmi.c
+++ b/drivers/platform/x86/eeepc-wmi.c
@@ -30,6 +30,8 @@
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
#include <linux/platform_device.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@@ -39,14 +41,21 @@ MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
MODULE_LICENSE("GPL");
#define EEEPC_WMI_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000"
+#define EEEPC_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66"
MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
+MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
#define NOTIFY_BRNUP_MIN 0x11
#define NOTIFY_BRNUP_MAX 0x1f
#define NOTIFY_BRNDOWN_MIN 0x20
#define NOTIFY_BRNDOWN_MAX 0x2e
+#define EEEPC_WMI_METHODID_DEVS 0x53564544
+#define EEEPC_WMI_METHODID_DSTS 0x53544344
+
+#define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012
+
static const struct key_entry eeepc_wmi_keymap[] = {
/* Sleep already handled via generic ACPI code */
{ KE_KEY, 0x5d, { KEY_WLAN } },
@@ -59,9 +68,15 @@ static const struct key_entry eeepc_wmi_keymap[] = {
{ KE_END, 0},
};
+struct bios_args {
+ u32 dev_id;
+ u32 ctrl_param;
+};
+
struct eeepc_wmi {
struct platform_device *platform_dev;
struct input_dev *input_dev;
+ struct backlight_device *backlight_dev;
};
static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc_wmi)
@@ -104,6 +119,139 @@ static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc_wmi)
eeepc_wmi->input_dev = NULL;
}
+static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
+{
+ struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ acpi_status status;
+ u32 tmp;
+
+ status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
+ 1, EEEPC_WMI_METHODID_DSTS, &input, &output);
+
+ if (ACPI_FAILURE(status))
+ return status;
+
+ obj = (union acpi_object *)output.pointer;
+ if (obj && obj->type == ACPI_TYPE_INTEGER)
+ tmp = (u32)obj->integer.value;
+ else
+ tmp = 0;
+
+ if (ctrl_param)
+ *ctrl_param = tmp;
+
+ kfree(obj);
+
+ return status;
+
+}
+
+static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
+{
+ struct bios_args args = {
+ .dev_id = dev_id,
+ .ctrl_param = ctrl_param,
+ };
+ struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
+ acpi_status status;
+
+ status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
+ 1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
+
+ return status;
+}
+
+static int read_brightness(struct backlight_device *bd)
+{
+ static u32 ctrl_param;
+ acpi_status status;
+
+ status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
+
+ if (ACPI_FAILURE(status))
+ return -1;
+ else
+ return ctrl_param & 0x000000FF;
+}
+
+static int update_bl_status(struct backlight_device *bd)
+{
+
+ static u32 ctrl_param;
+ acpi_status status;
+
+ ctrl_param = bd->props.brightness;
+
+ status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
+
+ if (ACPI_FAILURE(status))
+ return -1;
+ else
+ return 0;
+}
+
+static const struct backlight_ops eeepc_wmi_bl_ops = {
+ .get_brightness = read_brightness,
+ .update_status = update_bl_status,
+};
+
+static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc_wmi, bool increase)
+{
+ struct backlight_device *bd = eeepc_wmi->backlight_dev;
+ int old = bd->props.brightness;
+ int new;
+
+ if (increase)
+ new = old + 1;
+ else
+ new = old - 1;
+
+ if (new > bd->props.max_brightness)
+ new = bd->props.max_brightness;
+ else if (new < 0)
+ new = 0;
+
+ bd->props.brightness = new;
+ backlight_update_status(bd);
+ backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
+
+ return old;
+}
+
+static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc_wmi)
+{
+ struct backlight_device *bd;
+ struct backlight_properties props;
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.max_brightness = 15;
+ bd = backlight_device_register("eeepc-wmi",
+ &eeepc_wmi->platform_dev->dev, eeepc_wmi,
+ &eeepc_wmi_bl_ops, &props);
+ if (IS_ERR(bd)) {
+ pr_err("EEEPC WMI:Could not register backlight device\n");
+ return PTR_ERR(bd);
+ }
+
+ eeepc_wmi->backlight_dev = bd;
+
+ bd->props.brightness = read_brightness(bd);
+ bd->props.power = FB_BLANK_UNBLANK;
+ backlight_update_status(bd);
+
+ return 0;
+}
+
+static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc_wmi)
+{
+ if (eeepc_wmi->backlight_dev)
+ backlight_device_unregister(eeepc_wmi->backlight_dev);
+
+ eeepc_wmi->backlight_dev = NULL;
+}
+
static void eeepc_wmi_notify(u32 value, void *context)
{
struct eeepc_wmi *eeepc_wmi = (struct eeepc_wmi *)context;
@@ -128,6 +276,12 @@ static void eeepc_wmi_notify(u32 value, void *context)
else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
code = NOTIFY_BRNDOWN_MIN;
+ if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
+ if (!acpi_video_backlight_support())
+ eeepc_wmi_backlight_notify(eeepc_wmi,
+ code == NOTIFY_BRNUP_MIN);
+ }
+
if (!sparse_keymap_report_event(eeepc_wmi->input_dev,
code, 1, true))
pr_info("EEEPC WMI: Unknown key %x pressed\n", code);
@@ -146,7 +300,14 @@ static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
err = eeepc_wmi_input_init(eeepc_wmi);
if (err)
- return err;
+ goto error_input;
+
+ if (!acpi_video_backlight_support()) {
+ err = eeepc_wmi_backlight_init(eeepc_wmi);
+ if (err)
+ goto error_backlight;
+ } else
+ pr_info("EEEPC WMI: Backlight controlled by ACPI video driver\n");
status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
eeepc_wmi_notify, eeepc_wmi);
@@ -160,8 +321,10 @@ static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
return 0;
error_wmi:
+ eeepc_wmi_backlight_exit(eeepc_wmi);
+error_backlight:
eeepc_wmi_input_exit(eeepc_wmi);
-
+error_input:
return err;
}
@@ -171,6 +334,7 @@ static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
eeepc_wmi = wmi_get_driver_data(EEEPC_WMI_EVENT_GUID);
wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
+ eeepc_wmi_backlight_exit(eeepc_wmi);
eeepc_wmi_input_exit(eeepc_wmi);
return 0;
@@ -190,7 +354,7 @@ static int __init eeepc_wmi_init(void)
struct eeepc_wmi *eeepc_wmi;
int err;
- if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID)) {
+ if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) || !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
pr_warning("EEEPC WMI: No known WMI GUID found\n");
return -ENODEV;
}
--
1.5.5.1
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