lkml.org 
[lkml]   [2008]   [Jun]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[PATCH v2] Add backlight driver for Nvidia-based Apple Macbook Pros
    Nvidia-based Apple Macbook Pros don't appear to handle backlight control 
    through the graphics card registers or ACPI, but instead trigger changes
    via SMI calls. This driver registers a generic backlight device that
    lets existing userspace deal with it. Code derived from Julien Blache's
    Pommed application.

    Signed-off-by: Matthew Garrett <mjg@redhat.com>

    ---

    Added a missing static and a release_region() in the error path pointed
    out by Andrey Panin and Andrew Morton

    diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
    index dcd8073..56f4572 100644
    --- a/drivers/video/backlight/Kconfig
    +++ b/drivers/video/backlight/Kconfig
    @@ -112,3 +112,11 @@ config BACKLIGHT_CARILLO_RANCH
    help
    If you have a Intel LE80578 (Carillo Ranch) say Y to enable the
    backlight 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 33f6c7c..5b91515 100644
    --- a/drivers/video/backlight/Makefile
    +++ b/drivers/video/backlight/Makefile
    @@ -10,3 +10,4 @@ obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
    obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
    obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
    obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
    +obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
    diff --git a/drivers/video/backlight/mbp_nvidia_bl.c b/drivers/video/backlight/mbp_nvidia_bl.c
    new file mode 100644
    index 0000000..ebe6be5
    --- /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("svnApple Inc.:pnMacBookPro3,1");
    +MODULE_ALIAS("svnApple Inc.:pnMacBookPro3,2");
    +MODULE_ALIAS("svnApple Inc.:pnMacBookPro4,1");

    --
    Matthew Garrett | mjg59@srcf.ucam.org

    \
     
     \ /
      Last update: 2008-06-07 12:03    [W:0.031 / U:29.892 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site