diff options
| -rw-r--r-- | drivers/video/backlight/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/video/backlight/Makefile | 2 | ||||
| -rw-r--r-- | drivers/video/backlight/backlight.c | 1 | ||||
| -rw-r--r-- | drivers/video/backlight/mbp_nvidia_bl.c | 116 |
4 files changed, 128 insertions, 0 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index 98d9faf4970..452b770d8cc 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -155,3 +155,12 @@ config BACKLIGHT_PWM help If you have a LCD backlight adjustable by PWM, say Y to enable this driver. + +config BACKLIGHT_MBP_NVIDIA + tristate "MacBook Pro Nvidia Backlight Driver" + depends on BACKLIGHT_CLASS_DEVICE && X86 + default n + help + If you have an Apple Macbook Pro with Nvidia graphics hardware say Y + to enable a driver for its backlight + diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index d8a08e468cc..b405aace803 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -15,3 +15,5 @@ obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o +obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o + diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index 39394757679..fab0bc874b5 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -191,6 +191,7 @@ static struct device_attribute bl_device_attributes[] = { * backlight_device class. * @name: the name of the new object(must be the same as the name of the * respective framebuffer device). + * @parent: a pointer to the parent device * @devdata: an optional pointer to be stored for private driver use. The * methods may retrieve it by using bl_get_data(bd). * @ops: the backlight operations structure. diff --git a/drivers/video/backlight/mbp_nvidia_bl.c b/drivers/video/backlight/mbp_nvidia_bl.c new file mode 100644 index 00000000000..385cba40ea8 --- /dev/null +++ b/drivers/video/backlight/mbp_nvidia_bl.c @@ -0,0 +1,116 @@ +/* + * Backlight Driver for Nvidia 8600 in Macbook Pro + * + * Copyright (c) Red Hat <mjg@redhat.com> + * Based on code from Pommed: + * Copyright (C) 2006 Nicolas Boichat <nicolas @boichat.ch> + * Copyright (C) 2006 Felipe Alfaro Solana <felipe_alfaro @linuxmail.org> + * Copyright (C) 2007 Julien BLACHE <jb@jblache.org> + * + * 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. + * + * This driver triggers SMIs which cause the firmware to change the + * backlight brightness. This is icky in many ways, but it's impractical to + * get at the firmware code in order to figure out what it's actually doing. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/backlight.h> +#include <linux/err.h> +#include <linux/dmi.h> +#include <linux/io.h> + +static struct backlight_device *mbp_backlight_device; + +static struct dmi_system_id __initdata mbp_device_table[] = { + { + .ident = "3,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"), + }, + }, + { + .ident = "3,2", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"), + }, + }, + { + .ident = "4,1", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"), + }, + }, + { } +}; + +static int mbp_send_intensity(struct backlight_device *bd) +{ + int intensity = bd->props.brightness; + + outb(0x04 | (intensity << 4), 0xb3); + outb(0xbf, 0xb2); + + return 0; +} + +static int mbp_get_intensity(struct backlight_device *bd) +{ + outb(0x03, 0xb3); + outb(0xbf, 0xb2); + return inb(0xb3) >> 4; +} + +static struct backlight_ops mbp_ops = { + .get_brightness = mbp_get_intensity, + .update_status = mbp_send_intensity, +}; + +static int __init mbp_init(void) +{ + if (!dmi_check_system(mbp_device_table)) + return -ENODEV; + + if (!request_region(0xb2, 2, "Macbook Pro backlight")) + return -ENXIO; + + mbp_backlight_device = backlight_device_register("mbp_backlight", + NULL, NULL, + &mbp_ops); + if (IS_ERR(mbp_backlight_device)) { + release_region(0xb2, 2); + return PTR_ERR(mbp_backlight_device); + } + + mbp_backlight_device->props.max_brightness = 15; + mbp_backlight_device->props.brightness = + mbp_get_intensity(mbp_backlight_device); + backlight_update_status(mbp_backlight_device); + + return 0; +} + +static void __exit mbp_exit(void) +{ + backlight_device_unregister(mbp_backlight_device); + + release_region(0xb2, 2); +} + +module_init(mbp_init); +module_exit(mbp_exit); + +MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); +MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,1"); +MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,2"); +MODULE_ALIAS("svnAppleInc.:pnMacBookPro4,1"); |