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Date: Sat, 7 Jun 2008 09:04:05 +0400
From: Andrey Panin <pazke@...ke.donpac.ru>
To: Matthew Garrett <mjg59@...f.ucam.org>
Cc: rpurdie@...ys.net, linux-kernel@...r.kernel.org,
mzxreary@...inter.de
Subject: Re: [PATCH] Add backlight driver for Nvidia-based Apple Macbook
Pros
On 159, 06 07, 2008 at 03:54:36 +0100, Matthew Garrett wrote:
> 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@...hat.com>
>
> ---
>
> Lennart - as far as I could tell from your description, the DMI
> autoloading code for this should be correct. However, it's not working
> for me on F9. Have I missed something, or does it just not work there?
BTW do we have any documentation to help ordinary human understand and generate
these aliases ?
> 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..c622d22
> --- /dev/null
> +++ b/drivers/video/backlight/mbp_nvidia_bl.c
> @@ -0,0 +1,114 @@
> +/*
> + * Backlight Driver for Nvidia 8600 in Macbook Pro
> + *
> + * Copyright (c) Red Hat <mjg@...hat.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@...ache.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>
> +
> +struct backlight_device *mbp_backlight_device;
Missing static ?
> +
> +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))
> + return PTR_ERR(mbp_backlight_device);
You leak ioport region here.
> +
> + 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@...hat.com>");
> +MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("dmi:*:svnApple Inc.:pnMacBookPro3,1:*");
> +MODULE_ALIAS("dmi:*:svnApple Inc.:pnMacBookPro3,2:*");
> +MODULE_ALIAS("dmi:*:svnApple Inc.:pnMacBookPro4,1:*");
--
Andrey Panin | Linux and UNIX system administrator
pazke@...pac.ru | PGP key: wwwkeys.pgp.net
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