diff options
| -rw-r--r-- | drivers/staging/iio/adc/ad7291.c | 38 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7291.h | 12 |
2 files changed, 35 insertions, 15 deletions
diff --git a/drivers/staging/iio/adc/ad7291.c b/drivers/staging/iio/adc/ad7291.c index c2709d68af69..3fc79e582750 100644 --- a/drivers/staging/iio/adc/ad7291.c +++ b/drivers/staging/iio/adc/ad7291.c @@ -21,6 +21,8 @@ #include <linux/iio/sysfs.h> #include <linux/iio/events.h> +#include "ad7291.h" + /* * Simplified handling * @@ -76,7 +78,6 @@ struct ad7291_chip_info { struct i2c_client *client; struct regulator *reg; - u16 int_vref_mv; u16 command; u16 c_mask; /* Active voltage channels for events */ struct mutex state_lock; @@ -445,7 +446,15 @@ static int ad7291_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_SCALE: switch (chan->type) { case IIO_VOLTAGE: - *val = chip->int_vref_mv; + if (chip->reg) { + int vref; + vref = regulator_get_voltage(chip->reg); + if (vref < 0) + return vref; + *val = vref / 1000; + } else { + *val = 2500; + } *val2 = AD7291_BITS; return IIO_VAL_FRACTIONAL_LOG2; case IIO_TEMP: @@ -513,9 +522,10 @@ static const struct iio_info ad7291_info = { static int ad7291_probe(struct i2c_client *client, const struct i2c_device_id *id) { + struct ad7291_platform_data *pdata = client->dev.platform_data; struct ad7291_chip_info *chip; struct iio_dev *indio_dev; - int ret = 0, voltage_uv = 0; + int ret = 0; indio_dev = iio_device_alloc(sizeof(*chip)); if (indio_dev == NULL) { @@ -524,12 +534,14 @@ static int ad7291_probe(struct i2c_client *client, } chip = iio_priv(indio_dev); - chip->reg = regulator_get(&client->dev, "vcc"); - if (!IS_ERR(chip->reg)) { + if (pdata && pdata->use_external_ref) { + chip->reg = regulator_get(&client->dev, "vref"); + if (IS_ERR(chip->reg)) + goto error_free; + ret = regulator_enable(chip->reg); if (ret) goto error_put_reg; - voltage_uv = regulator_get_voltage(chip->reg); } mutex_init(&chip->state_lock); @@ -542,12 +554,8 @@ static int ad7291_probe(struct i2c_client *client, AD7291_T_SENSE_MASK | /* Tsense always enabled */ AD7291_ALERT_POLARITY; /* set irq polarity low level */ - if (voltage_uv) { - chip->int_vref_mv = voltage_uv / 1000; + if (pdata && pdata->use_external_ref) chip->command |= AD7291_EXT_REF; - } else { - chip->int_vref_mv = 2500; /* Build-in ref */ - } indio_dev->name = id->name; indio_dev->channels = ad7291_channels; @@ -590,12 +598,12 @@ error_unreg_irq: if (client->irq) free_irq(client->irq, indio_dev); error_disable_reg: - if (!IS_ERR(chip->reg)) + if (chip->reg) regulator_disable(chip->reg); error_put_reg: - if (!IS_ERR(chip->reg)) + if (chip->reg) regulator_put(chip->reg); - +error_free: iio_device_free(indio_dev); error_ret: return ret; @@ -611,7 +619,7 @@ static int ad7291_remove(struct i2c_client *client) if (client->irq) free_irq(client->irq, indio_dev); - if (!IS_ERR(chip->reg)) { + if (chip->reg) { regulator_disable(chip->reg); regulator_put(chip->reg); } diff --git a/drivers/staging/iio/adc/ad7291.h b/drivers/staging/iio/adc/ad7291.h new file mode 100644 index 000000000000..bbd89fa51188 --- /dev/null +++ b/drivers/staging/iio/adc/ad7291.h @@ -0,0 +1,12 @@ +#ifndef __IIO_AD7291_H__ +#define __IIO_AD7291_H__ + +/** + * struct ad7291_platform_data - AD7291 platform data + * @use_external_ref: Whether to use an external or internal reference voltage + */ +struct ad7291_platform_data { + bool use_external_ref; +}; + +#endif |