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acpi: add a way to promote/demote vendor backlight drivers
Instead of adding a big blacklist in video_detect.c to set ACPI_VIDEO_BACKLIGHT_DMI_VENDOR correctly, let external modules promote or demote themselves when they know the generic video module won't work. Currently drivers where using acpi_video_unregister() directly but: - That didn't respect any acpi_backlight=[video|vendor] parameter provided by the user. - Any later call to acpi_video_register() would still re-load the generic video module (and some gpu drivers are doing that). This patch fix those two issues. Signed-off-by: Corentin Chary <corentin.chary@gmail.com> Signed-off-by: Matthew Garrett <mjg@redhat.com>
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@ -182,8 +182,7 @@ long acpi_video_get_capabilities(acpi_handle graphics_handle)
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}
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EXPORT_SYMBOL(acpi_video_get_capabilities);
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/* Returns true if video.ko can do backlight switching */
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int acpi_video_backlight_support(void)
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static void acpi_video_caps_check(void)
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{
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/*
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* We must check whether the ACPI graphics device is physically plugged
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@ -191,6 +190,34 @@ int acpi_video_backlight_support(void)
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*/
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if (!acpi_video_caps_checked)
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acpi_video_get_capabilities(NULL);
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}
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/* Promote the vendor interface instead of the generic video module.
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* This function allow DMI blacklists to be implemented by externals
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* platform drivers instead of putting a big blacklist in video_detect.c
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* After calling this function you will probably want to call
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* acpi_video_unregister() to make sure the video module is not loaded
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*/
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void acpi_video_dmi_promote_vendor(void)
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{
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acpi_video_caps_check();
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acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
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}
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EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
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/* To be called when a driver who previously promoted the vendor
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* interface */
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void acpi_video_dmi_demote_vendor(void)
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{
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acpi_video_caps_check();
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acpi_video_support &= ~ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
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}
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EXPORT_SYMBOL(acpi_video_dmi_demote_vendor);
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/* Returns true if video.ko can do backlight switching */
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int acpi_video_backlight_support(void)
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{
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acpi_video_caps_check();
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/* First check for boot param -> highest prio */
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if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
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@ -190,6 +190,8 @@ extern bool wmi_has_guid(const char *guid);
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extern long acpi_video_get_capabilities(acpi_handle graphics_dev_handle);
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extern long acpi_is_video_device(struct acpi_device *device);
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extern void acpi_video_dmi_promote_vendor(void);
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extern void acpi_video_dmi_demote_vendor(void);
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extern int acpi_video_backlight_support(void);
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extern int acpi_video_display_switch_support(void);
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@ -205,6 +207,14 @@ static inline long acpi_is_video_device(struct acpi_device *device)
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return 0;
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}
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static inline void acpi_video_dmi_promote_vendor(void)
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{
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}
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static inline void acpi_video_dmi_demote_vendor(void)
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{
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}
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static inline int acpi_video_backlight_support(void)
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{
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return 0;
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