On Mon, Mar 19, 2012 at 10:46 AM, AceLan Kao <acelan.kao@xxxxxxxxxxxxx> wrote:
> Due to some implementation reasons, ASUS ET2012 All-in-One machines
> can't report the correct backlight power status, it will always return
> 1. To track the backlight power status correctly, we have to store the
> status by ourselves.
>
> BTW, by the BIOS design, the backlight power will be turn on/off
> sequently, no matter what the value of the parameter will be.
> More over, the brightness adjustment command will turn on the backlight
> power. Those behaviors will make us fail to track the backlight power
> status.
> For example, While we are trying to turn on the backlight power,
> we will send out the brightness adjustment command and then trying to
> figure out if we have to turn on the backlight power, then send out
> the command. But, the real case is that, the backlight power turns on
> while sending the brightness adjustment command, and then we send out
> the command to turn on the backlight power, it actually will turn off
> the backlight power and the backlight power status we recorded becomes
> wrong. So, we have to seperate these two commands by a if statement.
>
> Signed-off-by: AceLan Kao <acelan.kao@xxxxxxxxxxxxx>
> ---
> drivers/platform/x86/asus-wmi.c | 33 ++++++++++++++++++++-------------
> drivers/platform/x86/asus-wmi.h | 2 ++
> drivers/platform/x86/eeepc-wmi.c | 15 ++++++++++++---
> 3 files changed, 34 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index ea80fbe..9cd459a 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -1076,7 +1076,12 @@ static int asus_wmi_hwmon_init(struct asus_wmi *asus)
> */
> static int read_backlight_power(struct asus_wmi *asus)
> {
> - int ret = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_BACKLIGHT);
> + int ret;
> + if (asus->driver->quirks->store_backlight_power)
> + ret = !asus->driver->panel_power;
> + else
> + ret = asus_wmi_get_devstate_simple(asus,
> + ASUS_WMI_DEVID_BACKLIGHT);
>
> if (ret < 0)
> return ret;
> @@ -1138,24 +1143,23 @@ static int update_bl_status(struct backlight_device *bd)
> {
> struct asus_wmi *asus = bl_get_data(bd);
> u32 ctrl_param;
> - int power, err;
> -
> - if (asus->driver->quirks->scalar_panel_brightness)
> - ctrl_param = get_scalar_command(bd);
> - else
> - ctrl_param = bd->props.brightness;
> -
> - err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BRIGHTNESS,
> - ctrl_param, NULL);
> -
> - if (err < 0)
> - return err;
> + int power, err = 0;
>
> power = read_backlight_power(asus);
> if (power != -ENODEV && bd->props.power != power) {
> ctrl_param = !!(bd->props.power == FB_BLANK_UNBLANK);
> err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BACKLIGHT,
> ctrl_param, NULL);
> + if (asus->driver->quirks->store_backlight_power)
> + asus->driver->panel_power = bd->props.power;
> + } else {
> + if (asus->driver->quirks->scalar_panel_brightness)
> + ctrl_param = get_scalar_command(bd);
> + else
> + ctrl_param = bd->props.brightness;
> +
> + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BRIGHTNESS,
> + ctrl_param, NULL);
> }
Something I didn't notice, why is this moved in an "else" ?
Does this break something on your hardware ?
> return err;
> }
> @@ -1217,6 +1221,9 @@ static int asus_wmi_backlight_init(struct asus_wmi *asus)
>
> asus->backlight_device = bd;
>
> + if (asus->driver->quirks->store_backlight_power)
> + asus->driver->panel_power = power;
> +
> bd->props.brightness = read_brightness(bd);
> bd->props.power = power;
> backlight_update_status(bd);
> diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
> index ac7dd4e..35003e4 100644
> --- a/drivers/platform/x86/asus-wmi.h
> +++ b/drivers/platform/x86/asus-wmi.h
> @@ -38,11 +38,13 @@ struct asus_wmi;
> struct quirk_entry {
> bool hotplug_wireless;
> bool scalar_panel_brightness;
> + bool store_backlight_power;
> };
>
> struct asus_wmi_driver {
> int wapf;
> int brightness;
> + int panel_power;
>
> const char *name;
> struct module *owner;
> diff --git a/drivers/platform/x86/eeepc-wmi.c b/drivers/platform/x86/eeepc-wmi.c
> index 6f60ef0..d3742c2 100644
> --- a/drivers/platform/x86/eeepc-wmi.c
> +++ b/drivers/platform/x86/eeepc-wmi.c
> @@ -32,6 +32,7 @@
> #include <linux/input.h>
> #include <linux/input/sparse-keymap.h>
> #include <linux/dmi.h>
> +#include <linux/fb.h>
> #include <acpi/acpi_bus.h>
>
> #include "asus-wmi.h"
> @@ -95,8 +96,13 @@ static struct quirk_entry quirk_asus_1000h = {
> .hotplug_wireless = true,
> };
>
> +static struct quirk_entry quirk_asus_et2012_type1 = {
> + .store_backlight_power = true,
> +};
> +
> static struct quirk_entry quirk_asus_et2012_type3 = {
> .scalar_panel_brightness = true,
> + .store_backlight_power = true,
> };
>
> static int dmi_matched(const struct dmi_system_id *dmi)
> @@ -108,10 +114,12 @@ static int dmi_matched(const struct dmi_system_id *dmi)
> if (unlikely(strncmp(model, "ET2012", 6) == 0)) {
> const struct dmi_device *dev = NULL;
> char oemstring[30];
> - while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, NULL,
> - dev))) {
> + while ((dev = dmi_find_device(DMI_DEV_TYPE_OEM_STRING,
> + NULL, dev))) {
> if (sscanf(dev->name, "AEMS%24c", oemstring) == 1) {
> - if (oemstring[18] == '3')
> + if (oemstring[18] == '1')
> + quirks = &quirk_asus_et2012_type1;
> + else if (oemstring[18] == '3')
> quirks = &quirk_asus_et2012_type3;
> break;
> }
> @@ -199,6 +207,7 @@ static int eeepc_wmi_probe(struct platform_device *pdev)
> static void eeepc_wmi_quirks(struct asus_wmi_driver *driver)
> {
> driver->wapf = -1;
> + driver->panel_power = FB_BLANK_UNBLANK;
> driver->quirks = &quirk_asus_unknown;
> driver->quirks->hotplug_wireless = hotplug_wireless;
> dmi_check_system(asus_quirks);
> --
> 1.7.9.1
>
--
Corentin Chary
http://xf.iksaif.net
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