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https://github.com/edk2-porting/linux-next.git
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9905a43b2d
Signed-off-by: Emese Revfy <re.emese@gmail.com> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
271 lines
6.6 KiB
C
271 lines
6.6 KiB
C
/*
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* Backlight Driver for Nvidia 8600 in Macbook Pro
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*
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* Copyright (c) Red Hat <mjg@redhat.com>
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* Based on code from Pommed:
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* Copyright (C) 2006 Nicolas Boichat <nicolas @boichat.ch>
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* Copyright (C) 2006 Felipe Alfaro Solana <felipe_alfaro @linuxmail.org>
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* Copyright (C) 2007 Julien BLACHE <jb@jblache.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This driver triggers SMIs which cause the firmware to change the
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* backlight brightness. This is icky in many ways, but it's impractical to
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* get at the firmware code in order to figure out what it's actually doing.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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static struct backlight_device *mbp_backlight_device;
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/* Structure to be passed to the DMI_MATCH function. */
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struct dmi_match_data {
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/* I/O resource to allocate. */
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unsigned long iostart;
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unsigned long iolen;
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/* Backlight operations structure. */
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const struct backlight_ops backlight_ops;
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};
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/* Module parameters. */
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static int debug;
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module_param_named(debug, debug, int, 0644);
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MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");
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/*
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* Implementation for MacBooks with Intel chipset.
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*/
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static int intel_chipset_send_intensity(struct backlight_device *bd)
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{
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int intensity = bd->props.brightness;
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if (debug)
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printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
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intensity);
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outb(0x04 | (intensity << 4), 0xb3);
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outb(0xbf, 0xb2);
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return 0;
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}
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static int intel_chipset_get_intensity(struct backlight_device *bd)
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{
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int intensity;
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outb(0x03, 0xb3);
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outb(0xbf, 0xb2);
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intensity = inb(0xb3) >> 4;
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if (debug)
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printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
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intensity);
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return intensity;
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}
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static const struct dmi_match_data intel_chipset_data = {
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.iostart = 0xb2,
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.iolen = 2,
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.backlight_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.get_brightness = intel_chipset_get_intensity,
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.update_status = intel_chipset_send_intensity,
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}
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};
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/*
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* Implementation for MacBooks with Nvidia chipset.
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*/
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static int nvidia_chipset_send_intensity(struct backlight_device *bd)
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{
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int intensity = bd->props.brightness;
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if (debug)
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printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
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intensity);
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outb(0x04 | (intensity << 4), 0x52f);
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outb(0xbf, 0x52e);
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return 0;
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}
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static int nvidia_chipset_get_intensity(struct backlight_device *bd)
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{
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int intensity;
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outb(0x03, 0x52f);
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outb(0xbf, 0x52e);
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intensity = inb(0x52f) >> 4;
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if (debug)
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printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
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intensity);
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return intensity;
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}
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static const struct dmi_match_data nvidia_chipset_data = {
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.iostart = 0x52e,
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.iolen = 2,
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.backlight_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.get_brightness = nvidia_chipset_get_intensity,
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.update_status = nvidia_chipset_send_intensity
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}
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};
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/*
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* DMI matching.
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*/
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static /* const */ struct dmi_match_data *driver_data;
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static int mbp_dmi_match(const struct dmi_system_id *id)
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{
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driver_data = id->driver_data;
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printk(KERN_INFO "mbp_nvidia_bl: %s detected\n", id->ident);
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return 1;
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}
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static const struct dmi_system_id __initdata mbp_device_table[] = {
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookPro 3,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"),
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},
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.driver_data = (void *)&intel_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookPro 3,2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"),
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},
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.driver_data = (void *)&intel_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookPro 4,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"),
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},
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.driver_data = (void *)&intel_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookAir 1,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"),
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},
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.driver_data = (void *)&intel_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBook 5,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"),
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},
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.driver_data = (void *)&nvidia_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBook 5,2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"),
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},
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.driver_data = (void *)&nvidia_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookAir 2,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"),
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},
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.driver_data = (void *)&nvidia_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookPro 5,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"),
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},
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.driver_data = (void *)&nvidia_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookPro 5,2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"),
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},
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.driver_data = (void *)&nvidia_chipset_data,
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},
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{
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.callback = mbp_dmi_match,
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.ident = "MacBookPro 5,5",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"),
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},
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.driver_data = (void *)&nvidia_chipset_data,
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},
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{ }
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};
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static int __init mbp_init(void)
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{
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if (!dmi_check_system(mbp_device_table))
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return -ENODEV;
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if (!request_region(driver_data->iostart, driver_data->iolen,
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"Macbook Pro backlight"))
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return -ENXIO;
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mbp_backlight_device = backlight_device_register("mbp_backlight",
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NULL, NULL, &driver_data->backlight_ops);
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if (IS_ERR(mbp_backlight_device)) {
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release_region(driver_data->iostart, driver_data->iolen);
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return PTR_ERR(mbp_backlight_device);
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}
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mbp_backlight_device->props.max_brightness = 15;
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mbp_backlight_device->props.brightness =
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driver_data->backlight_ops.get_brightness(mbp_backlight_device);
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backlight_update_status(mbp_backlight_device);
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return 0;
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}
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static void __exit mbp_exit(void)
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{
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backlight_device_unregister(mbp_backlight_device);
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release_region(driver_data->iostart, driver_data->iolen);
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}
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module_init(mbp_init);
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module_exit(mbp_exit);
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MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
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MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(dmi, mbp_device_table);
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