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Date: Wed, 20 Feb 2013 04:40:11 +0000
From: "Kim, Milo" <Milo.Kim@...com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: "rpurdie@...ys.net" <rpurdie@...ys.net>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] 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@...com>
---
Documentation/backlight/lp855x-driver.txt | 4 +-
drivers/video/backlight/Kconfig | 2 +-
drivers/video/backlight/lp855x_bl.c | 87 ++++++++++++++++++++++++-----
include/linux/platform_data/lp855x.h | 19 +++++++
4 files changed, 94 insertions(+), 18 deletions(-)
diff --git a/Documentation/backlight/lp855x-driver.txt b/Documentation/backlight/lp855x-driver.txt
index 1529394..18b06ca 100644
--- a/Documentation/backlight/lp855x-driver.txt
+++ b/Documentation/backlight/lp855x-driver.txt
@@ -4,7 +4,7 @@ Kernel driver lp855x
Backlight driver for LP855x ICs
Supported chips:
- Texas Instruments LP8550, LP8551, LP8552, LP8553 and LP8556
+ Texas Instruments LP8550, LP8551, LP8552, LP8553, LP8556 and LP8557
Author: Milo(Woogyom) Kim <milo.kim@...com>
@@ -24,7 +24,7 @@ Value : pwm based or register based
2) chip_id
The lp855x chip id.
-Value : lp8550/lp8551/lp8552/lp8553/lp8556
+Value : lp8550/lp8551/lp8552/lp8553/lp8556/lp8557
Platform data for lp855x
------------------------
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 765a945..f24bc79 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -366,7 +366,7 @@ config BACKLIGHT_LP855X
tristate "Backlight driver for TI LP855X"
depends on BACKLIGHT_CLASS_DEVICE && I2C
help
- This supports TI LP8550, LP8551, LP8552, LP8553 and LP8556
+ This supports TI LP8550, LP8551, LP8552, LP8553, LP8556 and LP8557
backlight driver.
config BACKLIGHT_OT200
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index 050cfbb..edd2041 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -17,13 +17,23 @@
#include <linux/platform_data/lp855x.h>
#include <linux/pwm.h>
-/* Registers */
-#define BRIGHTNESS_CTRL 0x00
-#define DEVICE_CTRL 0x01
-#define EEPROM_START 0xA0
-#define EEPROM_END 0xA7
-#define EPROM_START 0xA0
-#define EPROM_END 0xAF
+/* LP8550/1/2/3/6 Registers */
+#define LP855X_BRIGHTNESS_CTRL 0x00
+#define LP855X_DEVICE_CTRL 0x01
+#define LP855X_EEPROM_START 0xA0
+#define LP855X_EEPROM_END 0xA7
+#define LP8556_EPROM_START 0xA0
+#define LP8556_EPROM_END 0xAF
+
+/* LP8557 Registers */
+#define LP8557_BL_CMD 0x00
+#define LP8557_BL_MASK 0x01
+#define LP8557_BL_ON 0x01
+#define LP8557_BL_OFF 0x00
+#define LP8557_BRIGHTNESS_CTRL 0x04
+#define LP8557_CONFIG 0x10
+#define LP8557_EPROM_START 0x10
+#define LP8557_EPROM_END 0x1E
#define BUF_SIZE 20
#define DEFAULT_BL_NAME "lcd-backlight"
@@ -75,6 +85,24 @@ static int lp855x_write_byte(struct lp855x *lp, u8 reg, u8 data)
return i2c_smbus_write_byte_data(lp->client, reg, data);
}
+static int lp855x_update_bit(struct lp855x *lp, u8 reg, u8 mask, u8 data)
+{
+ int ret;
+ u8 tmp;
+
+ ret = i2c_smbus_read_byte_data(lp->client, reg);
+ if (ret < 0) {
+ dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
+ return ret;
+ }
+
+ tmp = (u8)ret;
+ tmp &= ~mask;
+ tmp |= data & mask;
+
+ return lp855x_write_byte(lp, reg, tmp);
+}
+
static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)
{
u8 start, end;
@@ -84,12 +112,16 @@ static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)
case LP8551:
case LP8552:
case LP8553:
- start = EEPROM_START;
- end = EEPROM_END;
+ start = LP855X_EEPROM_START;
+ end = LP855X_EEPROM_END;
break;
case LP8556:
- start = EPROM_START;
- end = EPROM_END;
+ start = LP8556_EPROM_START;
+ end = LP8556_EPROM_END;
+ break;
+ case LP8557:
+ start = LP8557_EPROM_START;
+ end = LP8557_EPROM_END;
break;
default:
return false;
@@ -98,9 +130,30 @@ static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)
return (addr >= start && addr <= end);
}
+static int lp8557_bl_off(struct lp855x *lp)
+{
+ /* BL_ON = 0 before updating EPROM settings */
+ return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,
+ LP8557_BL_OFF);
+}
+
+static int lp8557_bl_on(struct lp855x *lp)
+{
+ /* BL_ON = 1 after updating EPROM settings */
+ return lp855x_update_bit(lp, LP8557_BL_CMD, LP8557_BL_MASK,
+ LP8557_BL_ON);
+}
+
static struct lp855x_device_config lp855x_dev_cfg = {
- .reg_brightness = BRIGHTNESS_CTRL,
- .reg_devicectrl = DEVICE_CTRL,
+ .reg_brightness = LP855X_BRIGHTNESS_CTRL,
+ .reg_devicectrl = LP855X_DEVICE_CTRL,
+};
+
+static struct lp855x_device_config lp8557_dev_cfg = {
+ .reg_brightness = LP8557_BRIGHTNESS_CTRL,
+ .reg_devicectrl = LP8557_CONFIG,
+ .pre_init_device = lp8557_bl_off,
+ .post_init_device = lp8557_bl_on,
};
/*
@@ -123,6 +176,9 @@ static int lp855x_configure(struct lp855x *lp)
case LP8550 ... LP8556:
lp->cfg = &lp855x_dev_cfg;
break;
+ case LP8557:
+ lp->cfg = &lp8557_dev_cfg;
+ break;
default:
return -EINVAL;
}
@@ -210,7 +266,7 @@ static int lp855x_bl_update_status(struct backlight_device *bl)
} else if (mode == REGISTER_BASED) {
u8 val = bl->props.brightness;
- lp855x_write_byte(lp, BRIGHTNESS_CTRL, val);
+ lp855x_write_byte(lp, lp->cfg->reg_brightness, val);
}
return 0;
@@ -224,7 +280,7 @@ static int lp855x_bl_get_brightness(struct backlight_device *bl)
if (mode == REGISTER_BASED) {
u8 val = 0;
- lp855x_read_byte(lp, BRIGHTNESS_CTRL, &val);
+ lp855x_read_byte(lp, lp->cfg->reg_brightness, &val);
bl->props.brightness = val;
}
@@ -376,6 +432,7 @@ static const struct i2c_device_id lp855x_ids[] = {
{"lp8552", LP8552},
{"lp8553", LP8553},
{"lp8556", LP8556},
+ {"lp8557", LP8557},
{ }
};
MODULE_DEVICE_TABLE(i2c, lp855x_ids);
diff --git a/include/linux/platform_data/lp855x.h b/include/linux/platform_data/lp855x.h
index e81f62d..20ee8b2 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;
--
1.7.9.5
Best Regards,
Milo
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