Staging: samsung-laptop: fix brightness level and add new device ids

The patch is against the 2.6.37 drivers/staging/samsung-laptop
driver and implements some extra enhancements.

It fixes an issue that the brightness would not change the level at
once as well as and some other oddities. It was resolved by
reallocated the SABI memory reagion using the "nocache" option.

The patch also introduces a new set of supported netbook models,
especially the NC10plus which was used for testing this patch. This new
set of models also offer 9 instead of just 8 brightness levels so it
also introduces an additional parameter for the models struct so that
models can define their own brightness range.

Signed-off-by: Nils Faerber <nils.faerber@kernelconcepts.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/samsung-laptop/samsung-laptop.c

@@ -111,6 +111,8 @@ struct sabi_config {
 	const struct sabi_header_offsets header_offsets;
 	const struct sabi_commands commands;
 	const struct sabi_performance_level performance_levels[4];
+	u8 min_brightness;
+	u8 max_brightness;
 };
 
 static const struct sabi_config sabi_configs[] = {
@@ -158,6 +160,8 @@ static const struct sabi_config sabi_configs[] = {
 			},
 			{ },
 		},
+		.min_brightness = 1,
+		.max_brightness = 8,
 	},
 	{
 		.test_string = "SwSmi@",
@@ -207,6 +211,8 @@ static const struct sabi_config sabi_configs[] = {
 			},
 			{ },
 		},
+		.min_brightness = 0,
+		.max_brightness = 8,
 	},
 	{ },
 };
@@ -362,17 +368,19 @@ static u8 read_brightness(void)
 
 	retval = sabi_get_command(sabi_config->commands.get_brightness,
 				  &sretval);
-	if (!retval)
+	if (!retval) {
 		user_brightness = sretval.retval[0];
 		if (user_brightness != 0)
-			--user_brightness;
+			user_brightness -= sabi_config->min_brightness;
+	}
 	return user_brightness;
 }
 
 static void set_brightness(u8 user_brightness)
 {
-	sabi_set_command(sabi_config->commands.set_brightness,
-			 user_brightness + 1);
+	u8 user_level = user_brightness - sabi_config->min_brightness;
+
+	sabi_set_command(sabi_config->commands.set_brightness, user_level);
 }
 
 static int get_brightness(struct backlight_device *bd)
@@ -592,6 +600,16 @@ static struct dmi_system_id __initdata samsung_dmi_table[] = {
 		},
 		.callback = dmi_check_cb,
 	},
+	{
+		.ident = "N150P/N210P/N220P",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR,
+					"SAMSUNG ELECTRONICS CO., LTD."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "N150P/N210P/N220P"),
+			DMI_MATCH(DMI_BOARD_NAME, "N150P/N210P/N220P"),
+		},
+		.callback = dmi_check_cb,
+	},
 	{
 		.ident = "R530/R730",
 		.matches = {
@@ -675,7 +693,7 @@ static int __init samsung_init(void)
 	if (!force && !dmi_check_system(samsung_dmi_table))
 		return -ENODEV;
 
-	f0000_segment = ioremap(0xf0000, 0xffff);
+	f0000_segment = ioremap_nocache(0xf0000, 0xffff);
 	if (!f0000_segment) {
 		pr_err("Can't map the segment at 0xf0000\n");
 		return -EINVAL;
@@ -719,7 +737,7 @@ static int __init samsung_init(void)
 	/* Get a pointer to the SABI Interface */
 	ifaceP = (readw(sabi + sabi_config->header_offsets.data_segment) & 0x0ffff) << 4;
 	ifaceP += readw(sabi + sabi_config->header_offsets.data_offset) & 0x0ffff;
-	sabi_iface = ioremap(ifaceP, 16);
+	sabi_iface = ioremap_nocache(ifaceP, 16);
 	if (!sabi_iface) {
 		pr_err("Can't remap %x\n", ifaceP);
 		goto exit;
@@ -753,7 +771,7 @@ static int __init samsung_init(void)
 
 	/* create a backlight device to talk to this one */
 	memset(&props, 0, sizeof(struct backlight_properties));
-	props.max_brightness = MAX_BRIGHT;
+	props.max_brightness = sabi_config->max_brightness;
 	backlight_device = backlight_device_register("samsung", &sdev->dev,
 						     NULL, &backlight_ops,
 						     &props);