diff options
Diffstat (limited to 'drivers/video/backlight/lp855x_bl.c')
| -rw-r--r-- | drivers/video/backlight/lp855x_bl.c | 21 |
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; |