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backlight: lp855x: Catch errors when changing brightness

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The lp855x_bl_update_status function's return type is int, but
it always returns 0, without checking for the results of the
write_byte/pwm_ctrl functions called within.

Make this function return the return values of the functions it
calls, and modify the lp855x_pwm_ctrl function to return errors.

Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Link: https://lore.kernel.org/r/20230714121440.7717-3-aweber.kernel@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Artur Weber 2023-07-14 14:14:40 +02:00 committed by Lee Jones
parent 4c09e20b3c
commit 5145531be5
1 changed files with 8 additions and 5 deletions
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13
drivers/video/backlight/lp855x_bl.c
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@ -217,7 +217,7 @@ err:
return ret;
}
static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
static int lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
{
struct pwm_state state;
@ -234,23 +234,26 @@ static void lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br)
state.duty_cycle = div_u64(br * state.period, max_br);
state.enabled = state.duty_cycle;
pwm_apply_state(lp->pwm, &state);
return pwm_apply_state(lp->pwm, &state);
}
static int lp855x_bl_update_status(struct backlight_device *bl)
{
struct lp855x *lp = bl_get_data(bl);
int brightness = bl->props.brightness;
int ret;
if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
brightness = 0;
if (lp->mode == PWM_BASED)
lp855x_pwm_ctrl(lp, brightness, bl->props.max_brightness);
ret = lp855x_pwm_ctrl(lp, brightness,
bl->props.max_brightness);
else if (lp->mode == REGISTER_BASED)
lp855x_write_byte(lp, lp->cfg->reg_brightness, (u8)brightness);
ret = lp855x_write_byte(lp, lp->cfg->reg_brightness,
(u8)brightness);
return 0;
return ret;
}
static const struct backlight_ops lp855x_bl_ops = {