From: Claudio Nieder [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Claudio Nieder Cc: Richard Purdie Signed-off-by: Andrew Morton --- drivers/video/backlight/Kconfig | 7 drivers/video/backlight/Makefile | 1 drivers/video/backlight/kb3886_bl.c | 218 ++++++++++++++++++++++++++ 3 files changed, 226 insertions(+) diff -puN drivers/video/backlight/Kconfig~backlight-driver-for-tabletkiosk-sahara-touchit-213-tablet-pc drivers/video/backlight/Kconfig --- a/drivers/video/backlight/Kconfig~backlight-driver-for-tabletkiosk-sahara-touchit-213-tablet-pc +++ a/drivers/video/backlight/Kconfig @@ -164,3 +164,10 @@ config BACKLIGHT_MBP_NVIDIA If you have an Apple Macbook Pro with Nvidia graphics hardware say Y to enable a driver for its backlight +config BACKLIGHT_SAHARA + tristate "Tabletkiosk Sahara Touch-iT Backlight Driver" + depends on BACKLIGHT_CLASS_DEVICE && X86 + default y + help + If you have a Tabletkiosk Sahara Touch-iT, say y to enable the + backlight driver. diff -puN drivers/video/backlight/Makefile~backlight-driver-for-tabletkiosk-sahara-touchit-213-tablet-pc drivers/video/backlight/Makefile --- a/drivers/video/backlight/Makefile~backlight-driver-for-tabletkiosk-sahara-touchit-213-tablet-pc +++ a/drivers/video/backlight/Makefile @@ -16,4 +16,5 @@ obj-$(CONFIG_BACKLIGHT_PROGEAR) += proge obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o +obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o diff -puN /dev/null drivers/video/backlight/kb3886_bl.c --- /dev/null +++ a/drivers/video/backlight/kb3886_bl.c @@ -0,0 +1,218 @@ +/* + * Backlight Driver for the KB3886 Backlight + * + * Copyright (c) 2007 Claudio Nieder + * + * Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle + * + * 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 +#include +#include +#include +#include +#include +#include +#include + + +/* + * The following is what corgi has in arch/arm/mach-pxa/corgi.c and + * corgi_lcd.c. On kernelnebwies it was suggested I put the platform_device + * code in my driver. + */ + +#define KB3886_PARENT 0x64 +#define KB3886_IO 0x60 +#define KB3886_ADC_DAC_PWM 0xC4 +#define KB3886_PWM0_WRITE 0x81 +#define KB3886_PWM0_READ 0x41 + +static DEFINE_MUTEX(bl_mutex); + +void kb3886_bl_set_intensity(int intensity) +{ + mutex_lock(&bl_mutex); + intensity = intensity&0xff; + outb(KB3886_ADC_DAC_PWM, KB3886_PARENT); + msleep(10); + outb(KB3886_PWM0_WRITE, KB3886_IO); + msleep(10); + outb(intensity, KB3886_IO); + mutex_unlock(&bl_mutex); +} + +struct kb3886bl_machinfo { + int max_intensity; + int default_intensity; + int limit_mask; + void (*set_bl_intensity)(int intensity); +}; + +static struct kb3886bl_machinfo kb3886_bl_machinfo = { + .max_intensity = 0xff, + .default_intensity = 0xa0, + .limit_mask = 0x7f, + .set_bl_intensity = kb3886_bl_set_intensity, +}; + +static struct platform_device kb3886bl_device = { + .name = "kb3886-bl", + .dev = { + .platform_data = &kb3886_bl_machinfo, + }, + .id = -1, +}; + +static struct platform_device *devices[] __initdata = { + &kb3886bl_device, +}; + +static void __init sahara_init(void) +{ + platform_add_devices(devices, ARRAY_SIZE(devices)); +} + +/* + * Back to driver + */ + +static int kb3886bl_intensity; +static struct backlight_device *kb3886_backlight_device; +static struct kb3886bl_machinfo *bl_machinfo; + +static unsigned long kb3886bl_flags; +#define KB3886BL_SUSPENDED 0x01 +#define KB3886BL_BATTLOW 0x02 + +static int kb3886bl_send_intensity(struct backlight_device *bd) +{ + int intensity = bd->props.brightness; + + if (bd->props.power != FB_BLANK_UNBLANK) + intensity = 0; + if (bd->props.fb_blank != FB_BLANK_UNBLANK) + intensity = 0; + if (kb3886bl_flags & KB3886BL_SUSPENDED) + intensity = 0; + if (kb3886bl_flags & KB3886BL_BATTLOW) + intensity &= bl_machinfo->limit_mask; + + bl_machinfo->set_bl_intensity(intensity); + + kb3886bl_intensity = intensity; + return 0; +} + +#ifdef CONFIG_PM +static int kb3886bl_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct backlight_device *bd = platform_get_drvdata(pdev); + + kb3886bl_flags |= KB3886BL_SUSPENDED; + backlight_update_status(bd); + return 0; +} + +static int kb3886bl_resume(struct platform_device *pdev) +{ + struct backlight_device *bd = platform_get_drvdata(pdev); + + kb3886bl_flags &= ~KB3886BL_SUSPENDED; + backlight_update_status(bd); + return 0; +} +#else +#define kb3886bl_suspend NULL +#define kb3886bl_resume NULL +#endif + +static int kb3886bl_get_intensity(struct backlight_device *bd) +{ + return kb3886bl_intensity; +} + +/* + * Called when the battery is low to limit the backlight intensity. + * If limit==0 clear any limit, otherwise limit the intensity + */ +void kb3886bl_limit_intensity(int limit) +{ + if (limit) + kb3886bl_flags |= KB3886BL_BATTLOW; + else + kb3886bl_flags &= ~KB3886BL_BATTLOW; + backlight_update_status(kb3886_backlight_device); +} +EXPORT_SYMBOL(kb3886bl_limit_intensity); + + +static struct backlight_ops kb3886bl_ops = { + .get_brightness = kb3886bl_get_intensity, + .update_status = kb3886bl_send_intensity, +}; + +static int kb3886bl_probe(struct platform_device *pdev) +{ + struct kb3886bl_machinfo *machinfo = pdev->dev.platform_data; + + bl_machinfo = machinfo; + if (!machinfo->limit_mask) + machinfo->limit_mask = -1; + + kb3886_backlight_device = backlight_device_register("kb3886-bl", + &pdev->dev, NULL, &kb3886bl_ops); + if (IS_ERR(kb3886_backlight_device)) + return PTR_ERR(kb3886_backlight_device); + + platform_set_drvdata(pdev, kb3886_backlight_device); + + kb3886_backlight_device->props.max_brightness = machinfo->max_intensity; + kb3886_backlight_device->props.power = FB_BLANK_UNBLANK; + kb3886_backlight_device->props.brightness = machinfo->default_intensity; + backlight_update_status(kb3886_backlight_device); + + return 0; +} + +static int kb3886bl_remove(struct platform_device *pdev) +{ + struct backlight_device *bd = platform_get_drvdata(pdev); + + backlight_device_unregister(bd); + + return 0; +} + +static struct platform_driver kb3886bl_driver = { + .probe = kb3886bl_probe, + .remove = kb3886bl_remove, + .suspend = kb3886bl_suspend, + .resume = kb3886bl_resume, + .driver = { + .name = "kb3886-bl", + }, +}; + +static int __init kb3886_init(void) +{ + sahara_init(); + return platform_driver_register(&kb3886bl_driver); +} + +static void __exit kb3886_exit(void) +{ + platform_driver_unregister(&kb3886bl_driver); +} + +module_init(kb3886_init); +module_exit(kb3886_exit); + +MODULE_AUTHOR("Claudio Nieder "); +MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver"); +MODULE_LICENSE("GPL"); _