diff options
Diffstat (limited to 'drivers/pwm/pwm-pca9685.c')
| -rw-r--r-- | drivers/pwm/pwm-pca9685.c | 83 |
1 files changed, 59 insertions, 24 deletions
diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c index f70162114197..42ed770b432c 100644 --- a/drivers/pwm/pwm-pca9685.c +++ b/drivers/pwm/pwm-pca9685.c @@ -107,6 +107,30 @@ static bool pca9685_prescaler_can_change(struct pca9685 *pca, int channel) return test_bit(channel, pca->pwms_enabled); } +static int pca9685_read_reg(struct pca9685 *pca, unsigned int reg, unsigned int *val) +{ + struct device *dev = pca->chip.dev; + int err; + + err = regmap_read(pca->regmap, reg, val); + if (err) + dev_err(dev, "regmap_read of register 0x%x failed: %pe\n", reg, ERR_PTR(err)); + + return err; +} + +static int pca9685_write_reg(struct pca9685 *pca, unsigned int reg, unsigned int val) +{ + struct device *dev = pca->chip.dev; + int err; + + err = regmap_write(pca->regmap, reg, val); + if (err) + dev_err(dev, "regmap_write to register 0x%x failed: %pe\n", reg, ERR_PTR(err)); + + return err; +} + /* Helper function to set the duty cycle ratio to duty/4096 (e.g. duty=2048 -> 50%) */ static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int duty) { @@ -115,12 +139,12 @@ static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int if (duty == 0) { /* Set the full OFF bit, which has the highest precedence */ - regmap_write(pca->regmap, REG_OFF_H(channel), LED_FULL); + pca9685_write_reg(pca, REG_OFF_H(channel), LED_FULL); return; } else if (duty >= PCA9685_COUNTER_RANGE) { /* Set the full ON bit and clear the full OFF bit */ - regmap_write(pca->regmap, REG_ON_H(channel), LED_FULL); - regmap_write(pca->regmap, REG_OFF_H(channel), 0); + pca9685_write_reg(pca, REG_ON_H(channel), LED_FULL); + pca9685_write_reg(pca, REG_OFF_H(channel), 0); return; } @@ -140,11 +164,11 @@ static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned int off = (on + duty) % PCA9685_COUNTER_RANGE; /* Set ON time (clears full ON bit) */ - regmap_write(pca->regmap, REG_ON_L(channel), on & 0xff); - regmap_write(pca->regmap, REG_ON_H(channel), (on >> 8) & 0xf); + pca9685_write_reg(pca, REG_ON_L(channel), on & 0xff); + pca9685_write_reg(pca, REG_ON_H(channel), (on >> 8) & 0xf); /* Set OFF time (clears full OFF bit) */ - regmap_write(pca->regmap, REG_OFF_L(channel), off & 0xff); - regmap_write(pca->regmap, REG_OFF_H(channel), (off >> 8) & 0xf); + pca9685_write_reg(pca, REG_OFF_L(channel), off & 0xff); + pca9685_write_reg(pca, REG_OFF_H(channel), (off >> 8) & 0xf); } static unsigned int pca9685_pwm_get_duty(struct pca9685 *pca, int channel) @@ -157,25 +181,25 @@ static unsigned int pca9685_pwm_get_duty(struct pca9685 *pca, int channel) return 0; } - regmap_read(pca->regmap, LED_N_OFF_H(channel), &off); + pca9685_read_reg(pca, LED_N_OFF_H(channel), &off); if (off & LED_FULL) { /* Full OFF bit is set */ return 0; } - regmap_read(pca->regmap, LED_N_ON_H(channel), &on); + pca9685_read_reg(pca, LED_N_ON_H(channel), &on); if (on & LED_FULL) { /* Full ON bit is set */ return PCA9685_COUNTER_RANGE; } - regmap_read(pca->regmap, LED_N_OFF_L(channel), &val); + pca9685_read_reg(pca, LED_N_OFF_L(channel), &val); off = ((off & 0xf) << 8) | (val & 0xff); if (!pwm->state.usage_power) return off; /* Read ON register to calculate duty cycle of staggered output */ - if (regmap_read(pca->regmap, LED_N_ON_L(channel), &val)) { + if (pca9685_read_reg(pca, LED_N_ON_L(channel), &val)) { /* Reset val to 0 in case reading LED_N_ON_L failed */ val = 0; } @@ -321,8 +345,15 @@ static inline int pca9685_pwm_gpio_probe(struct pca9685 *pca) static void pca9685_set_sleep_mode(struct pca9685 *pca, bool enable) { - regmap_update_bits(pca->regmap, PCA9685_MODE1, - MODE1_SLEEP, enable ? MODE1_SLEEP : 0); + struct device *dev = pca->chip.dev; + int err = regmap_update_bits(pca->regmap, PCA9685_MODE1, + MODE1_SLEEP, enable ? MODE1_SLEEP : 0); + if (err) { + dev_err(dev, "regmap_update_bits of register 0x%x failed: %pe\n", + PCA9685_MODE1, ERR_PTR(err)); + return; + } + if (!enable) { /* Wait 500us for the oscillator to be back up */ udelay(500); @@ -351,7 +382,7 @@ static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } - regmap_read(pca->regmap, PCA9685_PRESCALE, &val); + pca9685_read_reg(pca, PCA9685_PRESCALE, &val); if (prescale != val) { if (!pca9685_prescaler_can_change(pca, pwm->hwpwm)) { dev_err(chip->dev, @@ -369,7 +400,7 @@ static int __pca9685_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, pca9685_set_sleep_mode(pca, true); /* Change the chip-wide output frequency */ - regmap_write(pca->regmap, PCA9685_PRESCALE, prescale); + pca9685_write_reg(pca, PCA9685_PRESCALE, prescale); /* Wake the chip up */ pca9685_set_sleep_mode(pca, false); @@ -408,7 +439,7 @@ static void pca9685_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, unsigned int val = 0; /* Calculate (chip-wide) period from prescale value */ - regmap_read(pca->regmap, PCA9685_PRESCALE, &val); + pca9685_read_reg(pca, PCA9685_PRESCALE, &val); /* * PCA9685_OSC_CLOCK_MHZ is 25, i.e. an integer divider of 1000. * The following calculation is therefore only a multiplication @@ -505,7 +536,9 @@ static int pca9685_pwm_probe(struct i2c_client *client, mutex_init(&pca->lock); - regmap_read(pca->regmap, PCA9685_MODE2, ®); + ret = pca9685_read_reg(pca, PCA9685_MODE2, ®); + if (ret) + return ret; if (device_property_read_bool(&client->dev, "invert")) reg |= MODE2_INVRT; @@ -517,18 +550,20 @@ static int pca9685_pwm_probe(struct i2c_client *client, else reg |= MODE2_OUTDRV; - regmap_write(pca->regmap, PCA9685_MODE2, reg); + ret = pca9685_write_reg(pca, PCA9685_MODE2, reg); + if (ret) + return ret; /* Disable all LED ALLCALL and SUBx addresses to avoid bus collisions */ - regmap_read(pca->regmap, PCA9685_MODE1, ®); + pca9685_read_reg(pca, PCA9685_MODE1, ®); reg &= ~(MODE1_ALLCALL | MODE1_SUB1 | MODE1_SUB2 | MODE1_SUB3); - regmap_write(pca->regmap, PCA9685_MODE1, reg); + pca9685_write_reg(pca, PCA9685_MODE1, reg); /* Reset OFF/ON registers to POR default */ - regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_L, LED_FULL); - regmap_write(pca->regmap, PCA9685_ALL_LED_OFF_H, LED_FULL); - regmap_write(pca->regmap, PCA9685_ALL_LED_ON_L, 0); - regmap_write(pca->regmap, PCA9685_ALL_LED_ON_H, 0); + pca9685_write_reg(pca, PCA9685_ALL_LED_OFF_L, LED_FULL); + pca9685_write_reg(pca, PCA9685_ALL_LED_OFF_H, LED_FULL); + pca9685_write_reg(pca, PCA9685_ALL_LED_ON_L, 0); + pca9685_write_reg(pca, PCA9685_ALL_LED_ON_H, 0); pca->chip.ops = &pca9685_pwm_ops; /* Add an extra channel for ALL_LED */ |