/* * Backlight Driver for Nvidia 8600 in Macbook Pro * * Copyright (c) Red Hat * Based on code from Pommed: * Copyright (C) 2006 Nicolas Boichat * Copyright (C) 2006 Felipe Alfaro Solana * Copyright (C) 2007 Julien BLACHE * * 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 #include #include #include #include #include #include #include static struct backlight_device *mbp_backlight_device; /* Structure to be passed to the DMI_MATCH function. */ struct dmi_match_data { /* I/O resource to allocate. */ unsigned long iostart; unsigned long iolen; /* Backlight operations structure. */ struct backlight_ops backlight_ops; }; /* Module parameters. */ static int debug; module_param_named(debug, debug, int, 0644); MODULE_PARM_DESC(debug, "Set to one to enable debugging messages."); /* * Implementation for MacBooks with Intel chipset. */ static int intel_chipset_send_intensity(struct backlight_device *bd) { int intensity = bd->props.brightness; if (debug) printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n", intensity); outb(0x04 | (intensity << 4), 0xb3); outb(0xbf, 0xb2); return 0; } static int intel_chipset_get_intensity(struct backlight_device *bd) { int intensity; outb(0x03, 0xb3); outb(0xbf, 0xb2); intensity = inb(0xb3) >> 4; if (debug) printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n", intensity); return intensity; } static const struct dmi_match_data intel_chipset_data = { .iostart = 0xb2, .iolen = 2, .backlight_ops = { .options = BL_CORE_SUSPENDRESUME, .get_brightness = intel_chipset_get_intensity, .update_status = intel_chipset_send_intensity, } }; /* * Implementation for MacBooks with Nvidia chipset. */ static int nvidia_chipset_send_intensity(struct backlight_device *bd) { int intensity = bd->props.brightness; if (debug) printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n", intensity); outb(0x04 | (intensity << 4), 0x52f); outb(0xbf, 0x52e); return 0; } static int nvidia_chipset_get_intensity(struct backlight_device *bd) { int intensity; outb(0x03, 0x52f); outb(0xbf, 0x52e); intensity = inb(0x52f) >> 4; if (debug) printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n", intensity); return intensity; } static const struct dmi_match_data nvidia_chipset_data = { .iostart = 0x52e, .iolen = 2, .backlight_ops = { .options = BL_CORE_SUSPENDRESUME, .get_brightness = nvidia_chipset_get_intensity, .update_status = nvidia_chipset_send_intensity } }; /* * DMI matching. */ static /* const */ struct dmi_match_data *driver_data; static int mbp_dmi_match(const struct dmi_system_id *id) { driver_data = id->driver_data; printk(KERN_INFO "mbp_nvidia_bl: %s detected\n", id->ident); return 1; } static const struct dmi_system_id __initdata mbp_device_table[] = { { .callback = mbp_dmi_match, .ident = "MacBookPro 3,1", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"), }, .driver_data = (void *)&intel_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBookPro 3,2", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"), }, .driver_data = (void *)&intel_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBookPro 4,1", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"), }, .driver_data = (void *)&intel_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBookAir 1,1", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"), }, .driver_data = (void *)&intel_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBook 5,1", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"), }, .driver_data = (void *)&nvidia_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBook 5,2", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"), }, .driver_data = (void *)&nvidia_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBookAir 2,1", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"), }, .driver_data = (void *)&nvidia_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBookPro 5,1", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"), }, .driver_data = (void *)&nvidia_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBookPro 5,2", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"), }, .driver_data = (void *)&nvidia_chipset_data, }, { .callback = mbp_dmi_match, .ident = "MacBookPro 5,5", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"), }, .driver_data = (void *)&nvidia_chipset_data, }, { } }; static int __init mbp_init(void) { if (!dmi_check_system(mbp_device_table)) return -ENODEV; if (!request_region(driver_data->iostart, driver_data->iolen, "Macbook Pro backlight")) return -ENXIO; mbp_backlight_device = backlight_device_register("mbp_backlight", NULL, NULL, &driver_data->backlight_ops); if (IS_ERR(mbp_backlight_device)) { release_region(driver_data->iostart, driver_data->iolen); return PTR_ERR(mbp_backlight_device); } mbp_backlight_device->props.max_brightness = 15; mbp_backlight_device->props.brightness = driver_data->backlight_ops.get_brightness(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(driver_data->iostart, driver_data->iolen); } module_init(mbp_init); module_exit(mbp_exit); MODULE_AUTHOR("Matthew Garrett "); MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(dmi, mbp_device_table);