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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>
This commit is contained in:
Kim, Milo 2013-02-21 16:44:06 -08:00 committed by Linus Torvalds
parent 68853bc2b3
commit 26e8ccc223
4 changed files with 94 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/backlight/lp855x-driver.txt
View File

@ -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@ti.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
------------------------

2
drivers/video/backlight/Kconfig
View File

@ -381,7 +381,7 @@ 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

87
drivers/video/backlight/lp855x_bl.c
View File

@ -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);

19
include/linux/platform_data/lp855x.h
View File

@ -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;