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-rw-r--r--drivers/video/backlight/lp855x_bl.c37
1 files changed, 26 insertions, 11 deletions
diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c
index fd985e0681e..b437541555f 100644
--- a/drivers/video/backlight/lp855x_bl.c
+++ b/drivers/video/backlight/lp855x_bl.c
@@ -15,6 +15,7 @@
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/platform_data/lp855x.h>
+#include <linux/pwm.h>
/* Registers */
#define BRIGHTNESS_CTRL 0x00
@@ -36,6 +37,7 @@ struct lp855x {
struct device *dev;
struct mutex xfer_lock;
struct lp855x_platform_data *pdata;
+ struct pwm_device *pwm;
};
static int lp855x_read_byte(struct lp855x *lp, u8 reg, u8 *data)
@@ -121,6 +123,28 @@ static int lp855x_init_registers(struct lp855x *lp)
return ret;
}
+static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
+{
+ unsigned int period = lp->pdata->period_ns;
+ unsigned int duty = br * period / max_br;
+ struct pwm_device *pwm;
+
+ /* request pwm device with the consumer name */
+ if (!lp->pwm) {
+ pwm = devm_pwm_get(lp->dev, lp->chipname);
+ if (IS_ERR(pwm))
+ return;
+
+ lp->pwm = pwm;
+ }
+
+ pwm_config(lp->pwm, duty, period);
+ if (duty)
+ pwm_enable(lp->pwm);
+ else
+ pwm_disable(lp->pwm);
+}
+
static int lp855x_bl_update_status(struct backlight_device *bl)
{
struct lp855x *lp = bl_get_data(bl);
@@ -130,12 +154,10 @@ static int lp855x_bl_update_status(struct backlight_device *bl)
bl->props.brightness = 0;
if (mode == PWM_BASED) {
- struct lp855x_pwm_data *pd = &lp->pdata->pwm_data;
int br = bl->props.brightness;
int max_br = bl->props.max_brightness;
- if (pd->pwm_set_intensity)
- pd->pwm_set_intensity(br, max_br);
+ lp855x_pwm_ctrl(lp, br, max_br);
} else if (mode == REGISTER_BASED) {
u8 val = bl->props.brightness;
@@ -150,14 +172,7 @@ static int lp855x_bl_get_brightness(struct backlight_device *bl)
struct lp855x *lp = bl_get_data(bl);
enum lp855x_brightness_ctrl_mode mode = lp->pdata->mode;
- if (mode == PWM_BASED) {
- struct lp855x_pwm_data *pd = &lp->pdata->pwm_data;
- int max_br = bl->props.max_brightness;
-
- if (pd->pwm_get_intensity)
- bl->props.brightness = pd->pwm_get_intensity(max_br);
-
- } else if (mode == REGISTER_BASED) {
+ if (mode == REGISTER_BASED) {
u8 val = 0;
lp855x_read_byte(lp, BRIGHTNESS_CTRL, &val);