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platform samsung-q10: use ACPI instead of direct EC calls 

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 <fvanderwyck@gmail.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
This commit is contained in:
Frederick van der Wyck 2013-07-08 22:34:56 +01:00 committed by Matthew Garrett
parent fcb44e12d3
commit aa3b88a3a4
2 changed files with 22 additions and 45 deletions
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2
drivers/platform/x86/Kconfig
View File

@ -764,7 +764,7 @@ 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

65
drivers/platform/x86/samsung-q10.c
View File

@ -14,16 +14,12 @@
#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 }
static int samsungq10_bl_brightness;
static acpi_handle ec_handle;
static bool force;
module_param(force, bool, 0);
@ -33,21 +29,26 @@ 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 +56,6 @@ 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 +72,6 @@ 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 +80,6 @@ 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 +89,6 @@ static struct platform_driver samsungq10_driver = {
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
.pm = &samsungq10_pm_ops,
},
.probe = samsungq10_probe,
.remove = samsungq10_remove,
@ -172,6 +144,11 @@ static int __init samsungq10_init(void)
if (!force && !dmi_check_system(samsungq10_dmi_table))
return -ENODEV;
ec_handle = ec_get_handle();
if (!ec_handle)
return -ENODEV;
samsungq10_device = platform_create_bundle(&samsungq10_driver,
samsungq10_probe,
NULL, 0, NULL, 0);