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| author | Markus Moll <moll.markus@arcor.de> | 2020-09-22 21:28:35 +0200 |
|---|---|---|
| committer | Pavel Machek <pavel@ucw.cz> | 2020-09-30 18:53:28 +0200 |
| commit | 2a378856e32c98f747bde3fd338ca0e322aae8cb (patch) | |
| tree | a78f643fa7406643cc0eb2927140cb224867fa87 /drivers/leds | |
| parent | 9adc8af4c2f414a03235ae5403433ff1090a00ff (diff) | |
| download | linux-2a378856e32c98f747bde3fd338ca0e322aae8cb.tar.bz2 | |
leds: pca9532: correct shift computation in pca9532_getled
Each led setting occupies two bits in a corresponding led register.
Accessing these bits requires shifting and masking, which was
implemented incorrectly in pca9532_getled. Two new helper macros
concentrate the computation of those masks in one place.
Signed-off-by: Markus Moll <mmoll@de.pepperl-fuchs.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-pca9532.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c index 41229f775d35..d37fd9577d4b 100644 --- a/drivers/leds/leds-pca9532.c +++ b/drivers/leds/leds-pca9532.c @@ -27,6 +27,8 @@ #define PCA9532_REG_PWM(m, i) (PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2) #define LED_REG(m, led) (PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2)) #define LED_NUM(led) (led & 0x3) +#define LED_SHIFT(led) (LED_NUM(led) * 2) +#define LED_MASK(led) (0x3 << LED_SHIFT(led)) #define ldev_to_led(c) container_of(c, struct pca9532_led, ldev) @@ -162,9 +164,9 @@ static void pca9532_setled(struct pca9532_led *led) mutex_lock(&data->update_lock); reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); /* zero led bits */ - reg = reg & ~(0x3<<LED_NUM(led->id)*2); + reg = reg & ~LED_MASK(led->id); /* set the new value */ - reg = reg | (led->state << LED_NUM(led->id)*2); + reg = reg | (led->state << LED_SHIFT(led->id)); i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg); mutex_unlock(&data->update_lock); } @@ -260,7 +262,7 @@ static enum pca9532_state pca9532_getled(struct pca9532_led *led) mutex_lock(&data->update_lock); reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id)); - ret = reg >> LED_NUM(led->id)/2; + ret = (reg & LED_MASK(led->id)) >> LED_SHIFT(led->id); mutex_unlock(&data->update_lock); return ret; } |