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path: root/drivers/video/backlight/mbp_nvidia_bl.c
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Diffstat (limited to 'drivers/video/backlight/mbp_nvidia_bl.c')
-rw-r--r--drivers/video/backlight/mbp_nvidia_bl.c116
1 files changed, 116 insertions, 0 deletions
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");