diff options
| author | Guido Günther <agx@sigxcpu.org> | 2020-01-06 18:48:53 +0300 |
|---|---|---|
| committer | Pavel <pavel@ucw.cz> | 2020-01-07 16:09:27 +0300 |
| commit | 260718b3a35d23fe89d27cc7b5e8bd30f4bba1aa (patch) | |
| tree | 33557da2698d770c28d6369daf232819cdd581a5 /drivers/leds | |
| parent | 4a8d2bee2080d32511b70d8558036894f42617fd (diff) | |
| download | linux-260718b3a35d23fe89d27cc7b5e8bd30f4bba1aa.tar.xz | |
leds: lm3692x: Disable chip on brightness 0
Otherwise there's a noticeable glow even with brightness 0. Also
turning off the regulator can save additional power.
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-lm3692x.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c index 1254695d7e94..28a51aeb28de 100644 --- a/drivers/leds/leds-lm3692x.c +++ b/drivers/leds/leds-lm3692x.c @@ -116,7 +116,8 @@ struct lm3692x_led { int led_enable; int model_id; - u8 boost_ctrl; + u8 boost_ctrl, brightness_ctrl; + bool enabled; }; static const struct reg_default lm3692x_reg_defs[] = { @@ -170,6 +171,9 @@ static int lm3692x_leds_enable(struct lm3692x_led *led) int enable_state; int ret, reg_ret; + if (led->enabled) + return 0; + if (led->regulator) { ret = regulator_enable(led->regulator); if (ret) { @@ -272,6 +276,7 @@ static int lm3692x_leds_enable(struct lm3692x_led *led) ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_ENABLE_MASK, enable_state | LM3692X_DEVICE_EN); + led->enabled = true; return ret; out: dev_err(&led->client->dev, "Fail writing initialization values\n"); @@ -293,6 +298,9 @@ static int lm3692x_leds_disable(struct lm3692x_led *led) { int ret; + if (!led->enabled) + return 0; + ret = regmap_update_bits(led->regmap, LM3692X_EN, LM3692X_DEVICE_EN, 0); if (ret) { dev_err(&led->client->dev, "Failed to disable regulator: %d\n", @@ -310,6 +318,7 @@ static int lm3692x_leds_disable(struct lm3692x_led *led) "Failed to disable regulator: %d\n", ret); } + led->enabled = false; return ret; } @@ -323,6 +332,13 @@ static int lm3692x_brightness_set(struct led_classdev *led_cdev, mutex_lock(&led->lock); + if (brt_val == 0) { + ret = lm3692x_leds_disable(led); + goto out; + } else { + lm3692x_leds_enable(led); + } + ret = lm3692x_fault_check(led); if (ret) { dev_err(&led->client->dev, "Cannot read/clear faults: %d\n", |