backlight: lp855x_bl: support new LP8557 device

LP8557 is one of LP855x family device, but it has different register map
and initialization process.  To support this device, device specific
configuration is done through the lp855x_device_config structure.

Few register definitions are fixed for better readability.
  BRIGHTNESS_CTRL -> LP855X_BRIGHTNESS_CTRL
  DEVICE_CTRL     -> LP855X_DEVICE_CTRL
  EEPROM_START    -> LP855X_EEPROM_START
  EEPROM_END      -> LP855X_EEPROM_END
  EPROM_START     -> LP8556_EPROM_START
  EPROM_END       -> LP8556_EPROM_END

And LP8557 register definitions are added.  New register function,
lp855x_update_bit() is added.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/platform_data/lp855x.h b/include/linux/platform_data/lp855x.h
index e81f62d24ee2..20ee8b221dbd 100644
--- a/include/linux/platform_data/lp855x.h
+++ b/include/linux/platform_data/lp855x.h
@@ -49,12 +49,24 @@
 #define LP8556_FAST_CONFIG      BIT(7) /* use it if EPROMs should be maintained
                                           when exiting the low power mode */
 
+/* CONFIG register - LP8557 */
+#define LP8557_PWM_STANDBY      BIT(7)
+#define LP8557_PWM_FILTER       BIT(6)
+#define LP8557_RELOAD_EPROM     BIT(3)  /* use it if EPROMs should be reset
+                                           when the backlight turns on */
+#define LP8557_OFF_OPENLEDS     BIT(2)
+#define LP8557_PWM_CONFIG       LP8557_PWM_ONLY
+#define LP8557_I2C_CONFIG       LP8557_I2C_ONLY
+#define LP8557_COMB1_CONFIG     LP8557_COMBINED1
+#define LP8557_COMB2_CONFIG     LP8557_COMBINED2
+
 enum lp855x_chip_id {
         LP8550,
         LP8551,
         LP8552,
         LP8553,
         LP8556,
+        LP8557,
 };
 
 enum lp855x_brightness_ctrl_mode {
@@ -89,6 +101,13 @@ enum lp8556_brightness_source {
         LP8556_COMBINED2,       /* pwm + i2c after the shaper block */
 };
 
+enum lp8557_brightness_source {
+        LP8557_PWM_ONLY,
+        LP8557_I2C_ONLY,
+        LP8557_COMBINED1,       /* pwm + i2c after the shaper block */
+        LP8557_COMBINED2,       /* pwm + i2c before the shaper block */
+};
+
 struct lp855x_rom_data {
         u8 addr;
         u8 val;