[ re-sending CC [email protected] ] This patch changes the Samsung Q10 backlight driver to use ACPI methods (the same ones as triggered by the brightness up/down function keys) instead of direct EC calls. The advantage is that the brightness setting is not lost on shutdown.
Signed-off-by: Frederick van der Wyck <[email protected]> --- drivers/platform/x86/Kconfig | 2 +- drivers/platform/x86/samsung-q10.c | 77 ++++++++++++++++-------------------- 2 files changed, 35 insertions(+), 44 deletions(-) diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 8577261..52aed6d 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -762,7 +762,7 @@ config INTEL_OAKTRAIL config SAMSUNG_Q10 tristate "Samsung Q10 Extras" - depends on SERIO_I8042 + depends on ACPI select BACKLIGHT_CLASS_DEVICE ---help--- This driver provides support for backlight control on Samsung Q10 diff --git a/drivers/platform/x86/samsung-q10.c b/drivers/platform/x86/samsung-q10.c index 1a90b62..e7caaa3 100644 --- a/drivers/platform/x86/samsung-q10.c +++ b/drivers/platform/x86/samsung-q10.c @@ -14,16 +14,14 @@ #include <linux/init.h> #include <linux/platform_device.h> #include <linux/backlight.h> -#include <linux/i8042.h> #include <linux/dmi.h> +#include <acpi/acpi_drivers.h> -#define SAMSUNGQ10_BL_MAX_INTENSITY 255 -#define SAMSUNGQ10_BL_DEFAULT_INTENSITY 185 +#define SAMSUNGQ10_BL_MAX_INTENSITY 7 -#define SAMSUNGQ10_BL_8042_CMD 0xbe -#define SAMSUNGQ10_BL_8042_DATA { 0x89, 0x91 } +#define EC_HID "PNP0C09" -static int samsungq10_bl_brightness; +static acpi_handle ec_handle; static bool force; module_param(force, bool, 0); @@ -33,21 +31,26 @@ MODULE_PARM_DESC(force, static int samsungq10_bl_set_intensity(struct backlight_device *bd) { - int brightness = bd->props.brightness; - unsigned char c[3] = SAMSUNGQ10_BL_8042_DATA; + acpi_status status; + int i; - c[2] = (unsigned char)brightness; - i8042_lock_chip(); - i8042_command(c, (0x30 << 8) | SAMSUNGQ10_BL_8042_CMD); - i8042_unlock_chip(); - samsungq10_bl_brightness = brightness; + for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) { + status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL); + if (ACPI_FAILURE(status)) + return -EIO; + } + for (i = 0; i < bd->props.brightness; i++) { + status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL); + if (ACPI_FAILURE(status)) + return -EIO; + } return 0; } static int samsungq10_bl_get_intensity(struct backlight_device *bd) { - return samsungq10_bl_brightness; + return bd->props.brightness; } static const struct backlight_ops samsungq10_bl_ops = { @@ -55,28 +58,6 @@ static const struct backlight_ops samsungq10_bl_ops = { .update_status = samsungq10_bl_set_intensity, }; -#ifdef CONFIG_PM_SLEEP -static int samsungq10_suspend(struct device *dev) -{ - return 0; -} - -static int samsungq10_resume(struct device *dev) -{ - - struct backlight_device *bd = dev_get_drvdata(dev); - - samsungq10_bl_set_intensity(bd); - return 0; -} -#else -#define samsungq10_suspend NULL -#define samsungq10_resume NULL -#endif - -static SIMPLE_DEV_PM_OPS(samsungq10_pm_ops, - samsungq10_suspend, samsungq10_resume); - static int samsungq10_probe(struct platform_device *pdev) { @@ -93,9 +74,6 @@ static int samsungq10_probe(struct platform_device *pdev) platform_set_drvdata(pdev, bd); - bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY; - samsungq10_bl_set_intensity(bd); - return 0; } @@ -104,9 +82,6 @@ static int samsungq10_remove(struct platform_device *pdev) struct backlight_device *bd = platform_get_drvdata(pdev); - bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY; - samsungq10_bl_set_intensity(bd); - backlight_device_unregister(bd); return 0; @@ -116,7 +91,6 @@ static struct platform_driver samsungq10_driver = { .driver = { .name = KBUILD_MODNAME, .owner = THIS_MODULE, - .pm = &samsungq10_pm_ops, }, .probe = samsungq10_probe, .remove = samsungq10_remove, @@ -167,11 +141,28 @@ static struct dmi_system_id __initdata samsungq10_dmi_table[] = { }; MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table); +static acpi_status __init acpi_handle_locate_callback(acpi_handle handle, + u32 level, void *context, void **return_value) +{ + *(acpi_handle *)return_value = handle; + + return AE_CTRL_TERMINATE; +} + static int __init samsungq10_init(void) { + + acpi_status status; + if (!force && !dmi_check_system(samsungq10_dmi_table)) return -ENODEV; + status = acpi_get_devices(EC_HID, acpi_handle_locate_callback, + NULL, &ec_handle); + + if (ACPI_FAILURE(status)) + return -ENODEV; + samsungq10_device = platform_create_bundle(&samsungq10_driver, samsungq10_probe, NULL, 0, NULL, 0); -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
