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authorMario Schwalbe <schwalbe@inf.tu-dresden.de>2009-01-11 00:11:34 +0000
committerRichard Purdie <rpurdie@linux.intel.com>2009-04-06 16:06:55 +0100
commitc78a628849675580c7c5e1f07193c632e4b6827f (patch)
treecfeb5bf04e1a33b2ebeacabe9a0854cc8b1e2473 /drivers/video/backlight
parent0221c81b1b8eb0cbb6b30a0ced52ead32d2b4e4c (diff)
downloadlinux-stericsson-c78a628849675580c7c5e1f07193c632e4b6827f.tar.gz
backlight: Add support for MacBook 5, MacBook Air 2, and MacBook Pro 5
This patch adds support for the new Apple models incorporating an Nvidia chipset. Apple still uses the same protocol as on older models, but the registers moved to a different address. To do this, two sets of functions are added for the Intel/Nvidia chipset models and passed by the DMI_MATCH function. The initial code has been contributed by Hu Gang <hugang@soulinfo.com>. The driver is known to work on MacBook Pro 3, MacBook Pro 4 and MacBook Pro 5. Its known to work with limitations on MacBook 5 / MacBook Air 2. Changing brightness within X doesn't work, if using Nvidia's proprietary graphics driver with no known fix at present. Changing brightness on a text console or using the open-source driver does work. MacBook Pro 5 has a known bug where the initial brightness after bootup is the last recently used brightness (in Mac OSX), while the firmware reports maximum. Impossible to fix. [akpm@linux-foundation.org: build fix] [rpurdie@linux.intel.com: Rebased the patch against latest git] Signed-off-by: Mario Schwalbe <schwalbe@inf.tu-dresden.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
Diffstat (limited to 'drivers/video/backlight')
-rw-r--r--drivers/video/backlight/mbp_nvidia_bl.c162
1 files changed, 126 insertions, 36 deletions
diff --git a/drivers/video/backlight/mbp_nvidia_bl.c b/drivers/video/backlight/mbp_nvidia_bl.c
index 65864c500455..ce09b83244ac 100644
--- a/drivers/video/backlight/mbp_nvidia_bl.c
+++ b/drivers/video/backlight/mbp_nvidia_bl.c
@@ -27,52 +27,142 @@
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"),
- },
- },
- { }
+/* 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;
};
-static int mbp_send_intensity(struct backlight_device *bd)
+/*
+ * Implementation for MacBooks with Intel chipset.
+ */
+static int intel_chipset_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)
+static int intel_chipset_get_intensity(struct backlight_device *bd)
{
outb(0x03, 0xb3);
outb(0xbf, 0xb2);
return inb(0xb3) >> 4;
}
-static struct backlight_ops mbp_ops = {
- .options = BL_CORE_SUSPENDRESUME,
- .get_brightness = mbp_get_intensity,
- .update_status = mbp_send_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;
+
+ outb(0x04 | (intensity << 4), 0x52f);
+ outb(0xbf, 0x52e);
+ return 0;
+}
+
+static int nvidia_chipset_get_intensity(struct backlight_device *bd)
+{
+ outb(0x03, 0x52f);
+ outb(0xbf, 0x52e);
+ return inb(0x52f) >> 4;
+}
+
+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 = "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 = "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,
+ },
+ { }
};
static int __init mbp_init(void)
@@ -80,20 +170,20 @@ static int __init mbp_init(void)
if (!dmi_check_system(mbp_device_table))
return -ENODEV;
- if (!request_region(0xb2, 2, "Macbook Pro backlight"))
+ if (!request_region(driver_data->iostart, driver_data->iolen,
+ "Macbook Pro backlight"))
return -ENXIO;
mbp_backlight_device = backlight_device_register("mbp_backlight",
- NULL, NULL,
- &mbp_ops);
+ NULL, NULL, &driver_data->backlight_ops);
if (IS_ERR(mbp_backlight_device)) {
- release_region(0xb2, 2);
+ 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 =
- mbp_get_intensity(mbp_backlight_device);
+ driver_data->backlight_ops.get_brightness(mbp_backlight_device);
backlight_update_status(mbp_backlight_device);
return 0;
@@ -103,7 +193,7 @@ static void __exit mbp_exit(void)
{
backlight_device_unregister(mbp_backlight_device);
- release_region(0xb2, 2);
+ release_region(driver_data->iostart, driver_data->iolen);
}
module_init(mbp_init);