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authorKim, Milo <Milo.Kim@ti.com>2013-04-29 16:18:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-29 18:28:18 -0700
commit0b8185733966c1863b6b90ca2697327118ce5032 (patch)
tree746742b89c6eb0b9f20058139afc2ec93c3bd122 /drivers/video/backlight
parent600ffd33d09e3803d81607d3404a8cad709160e4 (diff)
backlight: lp855x: move backlight mode platform data
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>
Diffstat (limited to 'drivers/video/backlight')
-rw-r--r--drivers/video/backlight/lp855x_bl.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index df937ce5c2ec..b94dc00cea3f 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -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;