diff options
Diffstat (limited to 'drivers/platform/x86/samsung-q10.c')
| -rw-r--r-- | drivers/platform/x86/samsung-q10.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/platform/x86/samsung-q10.c b/drivers/platform/x86/samsung-q10.c new file mode 100644 index 00000000000..1e54ae74274 --- /dev/null +++ b/drivers/platform/x86/samsung-q10.c @@ -0,0 +1,196 @@ +/* + * Driver for Samsung Q10 and related laptops: controls the backlight + * + * Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/backlight.h> +#include <linux/i8042.h> +#include <linux/dmi.h> + +#define SAMSUNGQ10_BL_MAX_INTENSITY 255 +#define SAMSUNGQ10_BL_DEFAULT_INTENSITY 185 + +#define SAMSUNGQ10_BL_8042_CMD 0xbe +#define SAMSUNGQ10_BL_8042_DATA { 0x89, 0x91 } + +static int samsungq10_bl_brightness; + +static bool force; +module_param(force, bool, 0); +MODULE_PARM_DESC(force, + "Disable the DMI check and force the driver to be loaded"); + +static int samsungq10_bl_set_intensity(struct backlight_device *bd) +{ + + int brightness = bd->props.brightness; + unsigned char c[3] = SAMSUNGQ10_BL_8042_DATA; + + c[2] = (unsigned char)brightness; + i8042_lock_chip(); + i8042_command(c, (0x30 << 8) | SAMSUNGQ10_BL_8042_CMD); + i8042_unlock_chip(); + samsungq10_bl_brightness = brightness; + + return 0; +} + +static int samsungq10_bl_get_intensity(struct backlight_device *bd) +{ + return samsungq10_bl_brightness; +} + +static const struct backlight_ops samsungq10_bl_ops = { + .get_brightness = samsungq10_bl_get_intensity, + .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 __devinit samsungq10_probe(struct platform_device *pdev) +{ + + struct backlight_properties props; + struct backlight_device *bd; + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_PLATFORM; + props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY; + bd = backlight_device_register("samsung", &pdev->dev, NULL, + &samsungq10_bl_ops, &props); + if (IS_ERR(bd)) + return PTR_ERR(bd); + + platform_set_drvdata(pdev, bd); + + bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY; + samsungq10_bl_set_intensity(bd); + + return 0; +} + +static int __devexit 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; +} + +static struct platform_driver samsungq10_driver = { + .driver = { + .name = KBUILD_MODNAME, + .owner = THIS_MODULE, + .pm = &samsungq10_pm_ops, + }, + .probe = samsungq10_probe, + .remove = __devexit_p(samsungq10_remove), +}; + +static struct platform_device *samsungq10_device; + +static int __init dmi_check_callback(const struct dmi_system_id *id) +{ + printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident); + return 1; +} + +static struct dmi_system_id __initdata samsungq10_dmi_table[] = { + { + .ident = "Samsung Q10", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Samsung"), + DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"), + }, + .callback = dmi_check_callback, + }, + { + .ident = "Samsung Q20", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"), + DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"), + }, + .callback = dmi_check_callback, + }, + { + .ident = "Samsung Q25", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"), + DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"), + }, + .callback = dmi_check_callback, + }, + { + .ident = "Dell Latitude X200", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), + DMI_MATCH(DMI_PRODUCT_NAME, "X200"), + }, + .callback = dmi_check_callback, + }, + { }, +}; +MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table); + +static int __init samsungq10_init(void) +{ + if (!force && !dmi_check_system(samsungq10_dmi_table)) + return -ENODEV; + + samsungq10_device = platform_create_bundle(&samsungq10_driver, + samsungq10_probe, + NULL, 0, NULL, 0); + + if (IS_ERR(samsungq10_device)) + return PTR_ERR(samsungq10_device); + + return 0; +} + +static void __exit samsungq10_exit(void) +{ + platform_device_unregister(samsungq10_device); + platform_driver_unregister(&samsungq10_driver); +} + +module_init(samsungq10_init); +module_exit(samsungq10_exit); + +MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>"); +MODULE_DESCRIPTION("Samsung Q10 Driver"); +MODULE_LICENSE("GPL"); |