ACPI: thinkpad-acpi: update brightness sysfs interface support

Update the brightness sysfs interface (done through the backlight class) to
be in line with the rest of the thinkpad-acpi driver.

This renames the incorrect, un-obvious, and clash-prone name of "ibm" for
the backlight device to a much more fitting and descriptive
"thinkpad_screen".  This is something I wanted to do for quite a while...

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 5 insertions, 2 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index ba749df189ab..c0a023cc5ded 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -2414,8 +2414,9 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
         if (b < 0)
                 return b;
 
-        ibm_backlight_device = backlight_device_register("ibm", NULL, NULL,
-                                                         &ibm_backlight_data);
+        ibm_backlight_device = backlight_device_register(
+                                        TPACPI_BACKLIGHT_DEV_NAME, NULL, NULL,
+                                        &ibm_backlight_data);
         if (IS_ERR(ibm_backlight_device)) {
                 printk(IBM_ERR "Could not register backlight device\n");
                 return PTR_ERR(ibm_backlight_device);
diff --git a/drivers/misc/thinkpad_acpi.h b/drivers/misc/thinkpad_acpi.h
index 2fe4d61cc27f..8348fc653009 100644
--- a/drivers/misc/thinkpad_acpi.h
+++ b/drivers/misc/thinkpad_acpi.h
@@ -296,6 +296,8 @@ static int bluetooth_write(char *buf);
  * Brightness (backlight) subdriver
  */
 
+#define TPACPI_BACKLIGHT_DEV_NAME "thinkpad_screen"
+
 static struct backlight_device *ibm_backlight_device;
 static int brightness_offset = 0x31;