diff options
| -rw-r--r-- | drivers/pwm/pwm-pca9685.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c index b22c6da20ebc..882fcb051756 100644 --- a/drivers/pwm/pwm-pca9685.c +++ b/drivers/pwm/pwm-pca9685.c @@ -521,11 +521,36 @@ static const struct pwm_ops pca9685_pwm_ops = { .free = pca9685_pwm_free, }; +static bool pca9685_readable_reg(struct device *dev, unsigned int reg) +{ + /* The ALL_LED registers are readable but read as zero */ + return reg <= REG_OFF_H(15) || reg >= PCA9685_PRESCALE; +} + +static bool pca9685_writeable_reg(struct device *dev, unsigned int reg) +{ + return reg <= REG_OFF_H(15) || reg >= PCA9685_ALL_LED_ON_L; +} + +static bool pca9685_volatile_reg(struct device *dev, unsigned int reg) +{ + /* + * Writing to an ALL_LED register affects all LEDi registers, so they + * are not cachable. :-\ + */ + return reg < PCA9685_PRESCALE; +} + static const struct regmap_config pca9685_regmap_i2c_config = { .reg_bits = 8, .val_bits = 8, + + .readable_reg = pca9685_readable_reg, + .writeable_reg = pca9685_writeable_reg, + .volatile_reg = pca9685_volatile_reg, + .max_register = PCA9685_NUMREGS, - .cache_type = REGCACHE_NONE, + .cache_type = REGCACHE_MAPLE, }; static int pca9685_pwm_probe(struct i2c_client *client) |