Add backlight support for WMI based Eee PC laptops. In addition, start
to use a platform device to manage all functional devices as more
features will be implemented later.
Signed-off-by: Yong Wang <yong.y.wang@xxxxxxxxx>
--
drivers/platform/x86/eeepc-wmi.c | 301 +++++++++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 266 insertions(+), 35 deletions(-)
diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
index 9f88226..19438ea 100644
--- a/drivers/platform/x86/eeepc-wmi.c
+++ b/drivers/platform/x86/eeepc-wmi.c
@@ -30,6 +30,9 @@
#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>
@@ -38,6 +41,7 @@ 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);
@@ -46,6 +50,11 @@ MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
#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 } },
@@ -58,7 +67,189 @@ static const struct key_entry eeepc_wmi_keymap[] = {
{ KE_END, 0},
};
+struct bios_args {
+ u32 dev_id;
+ u32 ctrl_param;
+};
+
+static struct platform_device *eeepc_wmi_platform_device;
static struct input_dev *eeepc_wmi_input_dev;
+struct backlight_device *eeepc_wmi_backlight_device;
+
+static int eeepc_wmi_input_init(void)
+{
+ int err;
+
+ eeepc_wmi_input_dev = input_allocate_device();
+ if (!eeepc_wmi_input_dev)
+ return -ENOMEM;
+
+ eeepc_wmi_input_dev->name = "Eee PC WMI hotkeys";
+ eeepc_wmi_input_dev->phys = "wmi/input0";
+ eeepc_wmi_input_dev->id.bustype = BUS_HOST;
+ eeepc_wmi_input_dev->dev.parent = &eeepc_wmi_platform_device->dev;
+
+ err = sparse_keymap_setup(eeepc_wmi_input_dev, eeepc_wmi_keymap, NULL);
+ if (err)
+ goto err_free_dev;
+
+ err = input_register_device(eeepc_wmi_input_dev);
+ if (err)
+ goto err_free_keymap;
+
+ return 0;
+
+err_free_keymap:
+ sparse_keymap_free(eeepc_wmi_input_dev);
+err_free_dev:
+ input_free_device(eeepc_wmi_input_dev);
+ return err;
+}
+
+static void eeepc_wmi_input_exit(void)
+{
+ if (eeepc_wmi_input_dev) {
+ sparse_keymap_free(eeepc_wmi_input_dev);
+ input_unregister_device(eeepc_wmi_input_dev);
+ }
+
+ 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 struct backlight_ops eeepc_wmi_bl_ops = {
+ .get_brightness = read_brightness,
+ .update_status = update_bl_status,
+};
+
+static int eeepc_wmi_backlight_notify(bool increase)
+{
+ struct backlight_device *bd = eeepc_wmi_backlight_device;
+ 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(void)
+{
+ struct backlight_device *bd;
+
+ bd = backlight_device_register("eeepc-wmi",
+ &eeepc_wmi_platform_device->dev, NULL,
+ &eeepc_wmi_bl_ops);
+ if (IS_ERR(bd)) {
+ pr_err("EEEPC WMI:Could not register backlight device\n");
+ eeepc_wmi_backlight_device = NULL;
+ return PTR_ERR(bd);
+ }
+
+ eeepc_wmi_backlight_device = bd;
+
+ bd->props.brightness = read_brightness(bd);
+ bd->props.max_brightness = 15;
+ bd->props.power = FB_BLANK_UNBLANK;
+ backlight_update_status(bd);
+
+ return 0;
+}
+
+static void eeepc_wmi_backlight_exit(void)
+{
+ if (eeepc_wmi_backlight_device)
+ backlight_device_unregister(eeepc_wmi_backlight_device);
+
+ eeepc_wmi_backlight_device = NULL;
+}
static void eeepc_wmi_notify(u32 value, void *context)
{
@@ -83,6 +274,11 @@ 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(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);
@@ -91,67 +287,102 @@ static void eeepc_wmi_notify(u32 value, void *context)
kfree(obj);
}
-static int eeepc_wmi_input_setup(void)
+static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
{
int err;
+ acpi_status status;
- eeepc_wmi_input_dev = input_allocate_device();
- if (!eeepc_wmi_input_dev)
- return -ENOMEM;
-
- eeepc_wmi_input_dev->name = "Eee PC WMI hotkeys";
- eeepc_wmi_input_dev->phys = "wmi/input0";
- eeepc_wmi_input_dev->id.bustype = BUS_HOST;
-
- err = sparse_keymap_setup(eeepc_wmi_input_dev, eeepc_wmi_keymap, NULL);
+ err = eeepc_wmi_input_init();
if (err)
- goto err_free_dev;
+ goto error_input;
- err = input_register_device(eeepc_wmi_input_dev);
- if (err)
- goto err_free_keymap;
+ if (!acpi_video_backlight_support()) {
+ err = eeepc_wmi_backlight_init();
+ 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, NULL);
+ if (ACPI_FAILURE(status)) {
+ pr_err("EEEPC WMI: Unable to register notify handler - %d\n",
+ status);
+ err = -ENODEV;
+ goto error_wmi;
+ }
return 0;
-err_free_keymap:
- sparse_keymap_free(eeepc_wmi_input_dev);
-err_free_dev:
- input_free_device(eeepc_wmi_input_dev);
+error_wmi:
+ eeepc_wmi_backlight_exit();
+error_backlight:
+ eeepc_wmi_input_exit();
+error_input:
return err;
}
+static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
+{
+ wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
+ eeepc_wmi_backlight_exit();
+ eeepc_wmi_input_exit();
+
+ return 0;
+}
+
+static struct platform_driver platform_driver = {
+ .driver = {
+ .name = "eeepc-wmi",
+ .owner = THIS_MODULE,
+ },
+ .probe = eeepc_wmi_platform_probe,
+ .remove = __devexit_p(eeepc_wmi_platform_remove),
+};
+
static int __init eeepc_wmi_init(void)
{
int err;
- acpi_status status;
- 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;
+ err = -ENODEV;
+ goto out;
}
- err = eeepc_wmi_input_setup();
- if (err)
- return err;
+ eeepc_wmi_platform_device = platform_device_alloc("eeepc-wmi", -1);
+ if (!eeepc_wmi_platform_device) {
+ pr_warning("EEEPC WMI: Unable to allocate platform device\n");
+ err = -ENOMEM;
+ goto out;
+ }
- status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
- eeepc_wmi_notify, NULL);
- if (ACPI_FAILURE(status)) {
- sparse_keymap_free(eeepc_wmi_input_dev);
- input_unregister_device(eeepc_wmi_input_dev);
- pr_err("EEEPC WMI: Unable to register notify handler - %d\n",
- status);
- return -ENODEV;
+ err = platform_device_add(eeepc_wmi_platform_device);
+ if (err) {
+ pr_warning("EEEPC WMI: Unable to add platform device\n");
+ goto put_dev;
+ }
+
+ err = platform_driver_register(&platform_driver);
+ if (err) {
+ pr_warning("EEEPC WMI: Unable to register platform driver\n");
+ goto del_dev;
}
return 0;
+
+del_dev:
+ platform_device_del(eeepc_wmi_platform_device);
+put_dev:
+ platform_device_put(eeepc_wmi_platform_device);
+out:
+ return err;
}
static void __exit eeepc_wmi_exit(void)
{
- wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
- sparse_keymap_free(eeepc_wmi_input_dev);
- input_unregister_device(eeepc_wmi_input_dev);
+ platform_driver_unregister(&platform_driver);
+ platform_device_unregister(eeepc_wmi_platform_device);
}
module_init(eeepc_wmi_init);
--
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