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eeepc-wmi: add backlight support
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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>
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Yong Wang authored and Matthew Garrett committed Apr 12, 2010
1 parent 45f2c69 commit 3d7b165
Showing 1 changed file with 197 additions and 35 deletions.
232 changes: 197 additions & 35 deletions drivers/platform/x86/eeepc-wmi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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>
Expand All @@ -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 } },
Expand All @@ -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;
Expand Down Expand Up @@ -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;
Expand All @@ -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);
Expand All @@ -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;
}

Expand All @@ -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;
Expand All @@ -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;
}
Expand Down

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