eeepc-wmi: add backlight support
Add backlight support for WMI based Eee PC laptops. Signed-off-by: Yong Wang <yong.y.wang@intel.com> Signed-off-by: Matthew Garrett <mjg@redhat.com> Reviewed-by: Corentin Chary <corentincj@iksaif.net>
This commit is contained in:
Yong Wang
Matthew Garrett
parent
45f2c6937e
commit
3d7b165539
|
|
@ -32,6 +32,8 @@
|
|||
#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>
|
||||
|
|
@ -43,14 +45,21 @@ 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 } },
|
||||
|
|
@ -63,44 +72,18 @@ static const struct key_entry eeepc_wmi_keymap[] = {
|
|||
{ KE_END, 0},
|
||||
};
|
||||
|
||||
struct bios_args {
|
||||
u32 dev_id;
|
||||
u32 ctrl_param;
|
||||
};
|
||||
|
||||
struct eeepc_wmi {
|
||||
struct input_dev *inputdev;
|
||||
struct backlight_device *backlight_device;
|
||||
};
|
||||
|
||||
static struct platform_device *platform_device;
|
||||
|
||||
static void eeepc_wmi_notify(u32 value, void *context)
|
||||
{
|
||||
struct eeepc_wmi *eeepc = context;
|
||||
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
|
||||
union acpi_object *obj;
|
||||
acpi_status status;
|
||||
int code;
|
||||
|
||||
status = wmi_get_event_data(value, &response);
|
||||
if (status != AE_OK) {
|
||||
pr_err("bad event status 0x%x\n", status);
|
||||
return;
|
||||
}
|
||||
|
||||
obj = (union acpi_object *)response.pointer;
|
||||
|
||||
if (obj && obj->type == ACPI_TYPE_INTEGER) {
|
||||
code = obj->integer.value;
|
||||
|
||||
if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
|
||||
code = NOTIFY_BRNUP_MIN;
|
||||
else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
|
||||
code = NOTIFY_BRNDOWN_MIN;
|
||||
|
||||
if (!sparse_keymap_report_event(eeepc->inputdev,
|
||||
code, 1, true))
|
||||
pr_info("Unknown key %x pressed\n", code);
|
||||
}
|
||||
|
||||
kfree(obj);
|
||||
}
|
||||
|
||||
static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
|
||||
{
|
||||
int err;
|
||||
|
|
@ -141,6 +124,174 @@ static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
|
|||
eeepc->inputdev = 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 & 0xFF;
|
||||
}
|
||||
|
||||
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, int code)
|
||||
{
|
||||
struct backlight_device *bd = eeepc->backlight_device;
|
||||
int old = bd->props.brightness;
|
||||
int new;
|
||||
|
||||
if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
|
||||
new = code - NOTIFY_BRNUP_MIN + 1;
|
||||
else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
|
||||
new = code - NOTIFY_BRNDOWN_MIN;
|
||||
|
||||
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)
|
||||
{
|
||||
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_FILE,
|
||||
&platform_device->dev, eeepc,
|
||||
&eeepc_wmi_bl_ops, &props);
|
||||
if (IS_ERR(bd)) {
|
||||
pr_err("Could not register backlight device\n");
|
||||
return PTR_ERR(bd);
|
||||
}
|
||||
|
||||
eeepc->backlight_device = 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)
|
||||
{
|
||||
if (eeepc->backlight_device)
|
||||
backlight_device_unregister(eeepc->backlight_device);
|
||||
|
||||
eeepc->backlight_device = NULL;
|
||||
}
|
||||
|
||||
static void eeepc_wmi_notify(u32 value, void *context)
|
||||
{
|
||||
struct eeepc_wmi *eeepc = context;
|
||||
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
|
||||
union acpi_object *obj;
|
||||
acpi_status status;
|
||||
int code;
|
||||
int orig_code;
|
||||
|
||||
status = wmi_get_event_data(value, &response);
|
||||
if (status != AE_OK) {
|
||||
pr_err("bad event status 0x%x\n", status);
|
||||
return;
|
||||
}
|
||||
|
||||
obj = (union acpi_object *)response.pointer;
|
||||
|
||||
if (obj && obj->type == ACPI_TYPE_INTEGER) {
|
||||
code = obj->integer.value;
|
||||
orig_code = code;
|
||||
|
||||
if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
|
||||
code = NOTIFY_BRNUP_MIN;
|
||||
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, orig_code);
|
||||
}
|
||||
|
||||
if (!sparse_keymap_report_event(eeepc->inputdev,
|
||||
code, 1, true))
|
||||
pr_info("Unknown key %x pressed\n", code);
|
||||
}
|
||||
|
||||
kfree(obj);
|
||||
}
|
||||
|
||||
static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
|
||||
{
|
||||
struct eeepc_wmi *eeepc;
|
||||
|
|
@ -151,7 +302,14 @@ static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
|
|||
|
||||
err = eeepc_wmi_input_init(eeepc);
|
||||
if (err)
|
||||
return err;
|
||||
goto error_input;
|
||||
|
||||
if (!acpi_video_backlight_support()) {
|
||||
err = eeepc_wmi_backlight_init(eeepc);
|
||||
if (err)
|
||||
goto error_backlight;
|
||||
} else
|
||||
pr_info("Backlight controlled by ACPI video driver\n");
|
||||
|
||||
status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
|
||||
eeepc_wmi_notify, eeepc);
|
||||
|
|
@ -165,8 +323,10 @@ static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
|
|||
return 0;
|
||||
|
||||
error_wmi:
|
||||
eeepc_wmi_backlight_exit(eeepc);
|
||||
error_backlight:
|
||||
eeepc_wmi_input_exit(eeepc);
|
||||
|
||||
error_input:
|
||||
return err;
|
||||
}
|
||||
|
||||
|
|
@ -176,6 +336,7 @@ static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
|
|||
|
||||
eeepc = platform_get_drvdata(device);
|
||||
wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
|
||||
eeepc_wmi_backlight_exit(eeepc);
|
||||
eeepc_wmi_input_exit(eeepc);
|
||||
|
||||
return 0;
|
||||
|
|
@ -195,7 +356,8 @@ static int __init eeepc_wmi_init(void)
|
|||
struct eeepc_wmi *eeepc;
|
||||
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("No known WMI GUID found\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue