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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 @@
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/input/sparse-keymap.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/platform_device.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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@ -43,14 +45,21 @@ MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver");
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MODULE_LICENSE("GPL");
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#define EEEPC_WMI_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000"
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#define EEEPC_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66"
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MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID);
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MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID);
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#define NOTIFY_BRNUP_MIN 0x11
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#define NOTIFY_BRNUP_MAX 0x1f
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#define NOTIFY_BRNDOWN_MIN 0x20
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#define NOTIFY_BRNDOWN_MAX 0x2e
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#define EEEPC_WMI_METHODID_DEVS 0x53564544
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#define EEEPC_WMI_METHODID_DSTS 0x53544344
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#define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012
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static const struct key_entry eeepc_wmi_keymap[] = {
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/* Sleep already handled via generic ACPI code */
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{ KE_KEY, 0x5d, { KEY_WLAN } },
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@ -63,44 +72,18 @@ static const struct key_entry eeepc_wmi_keymap[] = {
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{ KE_END, 0},
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};
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struct bios_args {
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u32 dev_id;
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u32 ctrl_param;
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};
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struct eeepc_wmi {
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struct input_dev *inputdev;
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struct backlight_device *backlight_device;
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};
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static struct platform_device *platform_device;
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static void eeepc_wmi_notify(u32 value, void *context)
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{
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struct eeepc_wmi *eeepc = context;
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struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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int code;
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status = wmi_get_event_data(value, &response);
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if (status != AE_OK) {
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pr_err("bad event status 0x%x\n", status);
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return;
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}
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obj = (union acpi_object *)response.pointer;
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if (obj && obj->type == ACPI_TYPE_INTEGER) {
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code = obj->integer.value;
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if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
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code = NOTIFY_BRNUP_MIN;
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else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
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code = NOTIFY_BRNDOWN_MIN;
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if (!sparse_keymap_report_event(eeepc->inputdev,
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code, 1, true))
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pr_info("Unknown key %x pressed\n", code);
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}
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kfree(obj);
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}
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static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc)
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{
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int err;
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@ -141,6 +124,174 @@ static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc)
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eeepc->inputdev = NULL;
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}
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static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param)
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{
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struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id };
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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u32 tmp;
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status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
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1, EEEPC_WMI_METHODID_DSTS, &input, &output);
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if (ACPI_FAILURE(status))
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return status;
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obj = (union acpi_object *)output.pointer;
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if (obj && obj->type == ACPI_TYPE_INTEGER)
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tmp = (u32)obj->integer.value;
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else
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tmp = 0;
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if (ctrl_param)
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*ctrl_param = tmp;
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kfree(obj);
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return status;
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}
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static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param)
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{
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struct bios_args args = {
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.dev_id = dev_id,
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.ctrl_param = ctrl_param,
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};
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struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
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acpi_status status;
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status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID,
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1, EEEPC_WMI_METHODID_DEVS, &input, NULL);
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return status;
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}
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static int read_brightness(struct backlight_device *bd)
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{
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static u32 ctrl_param;
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acpi_status status;
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status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param);
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if (ACPI_FAILURE(status))
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return -1;
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else
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return ctrl_param & 0xFF;
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}
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static int update_bl_status(struct backlight_device *bd)
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{
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static u32 ctrl_param;
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acpi_status status;
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ctrl_param = bd->props.brightness;
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status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param);
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if (ACPI_FAILURE(status))
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return -1;
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else
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return 0;
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}
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static const struct backlight_ops eeepc_wmi_bl_ops = {
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.get_brightness = read_brightness,
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.update_status = update_bl_status,
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};
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static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code)
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{
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struct backlight_device *bd = eeepc->backlight_device;
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int old = bd->props.brightness;
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int new;
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if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
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new = code - NOTIFY_BRNUP_MIN + 1;
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else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
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new = code - NOTIFY_BRNDOWN_MIN;
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bd->props.brightness = new;
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backlight_update_status(bd);
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backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
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return old;
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}
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static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc)
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{
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struct backlight_device *bd;
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struct backlight_properties props;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.max_brightness = 15;
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bd = backlight_device_register(EEEPC_WMI_FILE,
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&platform_device->dev, eeepc,
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&eeepc_wmi_bl_ops, &props);
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if (IS_ERR(bd)) {
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pr_err("Could not register backlight device\n");
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return PTR_ERR(bd);
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}
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eeepc->backlight_device = bd;
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bd->props.brightness = read_brightness(bd);
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bd->props.power = FB_BLANK_UNBLANK;
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backlight_update_status(bd);
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return 0;
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}
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static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc)
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{
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if (eeepc->backlight_device)
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backlight_device_unregister(eeepc->backlight_device);
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eeepc->backlight_device = NULL;
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}
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static void eeepc_wmi_notify(u32 value, void *context)
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{
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struct eeepc_wmi *eeepc = context;
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struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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int code;
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int orig_code;
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status = wmi_get_event_data(value, &response);
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if (status != AE_OK) {
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pr_err("bad event status 0x%x\n", status);
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return;
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}
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obj = (union acpi_object *)response.pointer;
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if (obj && obj->type == ACPI_TYPE_INTEGER) {
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code = obj->integer.value;
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orig_code = code;
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if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
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code = NOTIFY_BRNUP_MIN;
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else if (code >= NOTIFY_BRNDOWN_MIN &&
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code <= NOTIFY_BRNDOWN_MAX)
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code = NOTIFY_BRNDOWN_MIN;
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if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
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if (!acpi_video_backlight_support())
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eeepc_wmi_backlight_notify(eeepc, orig_code);
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}
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if (!sparse_keymap_report_event(eeepc->inputdev,
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code, 1, true))
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pr_info("Unknown key %x pressed\n", code);
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}
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kfree(obj);
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}
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static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
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{
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struct eeepc_wmi *eeepc;
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@ -151,7 +302,14 @@ static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
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err = eeepc_wmi_input_init(eeepc);
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if (err)
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return err;
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goto error_input;
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if (!acpi_video_backlight_support()) {
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err = eeepc_wmi_backlight_init(eeepc);
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if (err)
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goto error_backlight;
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} else
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pr_info("Backlight controlled by ACPI video driver\n");
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status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID,
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eeepc_wmi_notify, eeepc);
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@ -165,8 +323,10 @@ static int __devinit eeepc_wmi_platform_probe(struct platform_device *device)
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return 0;
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error_wmi:
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eeepc_wmi_backlight_exit(eeepc);
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error_backlight:
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eeepc_wmi_input_exit(eeepc);
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error_input:
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return err;
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}
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@ -176,6 +336,7 @@ static int __devexit eeepc_wmi_platform_remove(struct platform_device *device)
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eeepc = platform_get_drvdata(device);
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wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID);
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eeepc_wmi_backlight_exit(eeepc);
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eeepc_wmi_input_exit(eeepc);
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return 0;
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@ -195,7 +356,8 @@ static int __init eeepc_wmi_init(void)
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struct eeepc_wmi *eeepc;
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int err;
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if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID)) {
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if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) ||
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!wmi_has_guid(EEEPC_WMI_MGMT_GUID)) {
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pr_warning("No known WMI GUID found\n");
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return -ENODEV;
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}
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