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backlight: lp855x: move backlight mode platform data

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The brightness of LP855x devices is controlled by I2C register or PWM
input .  This mode was selected through the platform data, but it can be
chosen by the driver internally without platform data configuration.

How to decide the control mode:
  If the PWM period has specific value, the mode is PWM input.
  On the other hand, the mode is register-based.
  This mode selection is done on the _probe().

Move 'mode' from a header file to the driver private data structure,
'lp855 x'.  And correlated code was replaced.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.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
2013-04-29 16:18:03 -07:00
committed by Linus Torvalds
parent 600ffd33d0
commit 0b81857339
3 changed files with 15 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/video/backlight/lp855x_bl.c
View File

@@ -38,6 +38,11 @@
#define DEFAULT_BL_NAME "lcd-backlight"
#define MAX_BRIGHTNESS 255
enum lp855x_brightness_ctrl_mode {
PWM_BASED = 1,
REGISTER_BASED,
};
struct lp855x;
/*
@@ -57,6 +62,7 @@ struct lp855x_device_config {
struct lp855x {
const char *chipname;
enum lp855x_chip_id chip_id;
enum lp855x_brightness_ctrl_mode mode;
struct lp855x_device_config *cfg;
struct i2c_client *client;
struct backlight_device *bl;
@@ -238,18 +244,17 @@ static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
static int lp855x_bl_update_status(struct backlight_device *bl)
{
struct lp855x *lp = bl_get_data(bl);
enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
if (bl->props.state & BL_CORE_SUSPENDED)
bl->props.brightness = 0;
if (mode == PWM_BASED) {
if (lp->mode == PWM_BASED) {
int br = bl->props.brightness;
int max_br = bl->props.max_brightness;
lp855x_pwm_ctrl(lp, br, max_br);
} else if (mode == REGISTER_BASED) {
} else if (lp->mode == REGISTER_BASED) {
u8 val = bl->props.brightness;
lp855x_write_byte(lp, lp->cfg->reg_brightness, val);
}
@@ -310,12 +315,11 @@ static ssize_t lp855x_get_bl_ctl_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lp855x *lp = dev_get_drvdata(dev);
enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
char *strmode = NULL;
if (mode == PWM_BASED)
if (lp->mode == PWM_BASED)
strmode = "pwm based";
else if (mode == REGISTER_BASED)
else if (lp->mode == REGISTER_BASED)
strmode = "register based";
return scnprintf(buf, PAGE_SIZE, "%s\n", strmode);
@@ -352,6 +356,11 @@ static int lp855x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
if (!lp)
return -ENOMEM;
if (pdata->period_ns > 0)
lp->mode = PWM_BASED;
else
lp->mode = REGISTER_BASED;
lp->client = cl;
lp->dev = &cl->dev;
lp->pdata = pdata;