On Tue, May 10, 2016 at 2:42 AM, Matt Ranostay <matt.ranostay@xxxxxxxxx> wrote:
> TI ADS1115 is a 16-bit resolution ADC that is register map
> compatible with the ADS1015 device.
>
> Cc: daniel.baluta@xxxxxxxxx
> Signed-off-by: Matt Ranostay <matt.ranostay@xxxxxxxxx>
> ---
> drivers/iio/adc/ti-ads1015.c | 77 ++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 71 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
> index 73cbf0b54e54..317325692cb3 100644
> --- a/drivers/iio/adc/ti-ads1015.c
> +++ b/drivers/iio/adc/ti-ads1015.c
> @@ -55,6 +55,11 @@
> #define ADS1015_DEFAULT_DATA_RATE 4
> #define ADS1015_DEFAULT_CHAN 0
>
> +enum {
> + ADS1015,
> + ADS1115,
> +};
> +
> enum ads1015_channels {
> ADS1015_AIN0_AIN1 = 0,
> ADS1015_AIN0_AIN3,
> @@ -123,6 +128,42 @@ static const struct {
> }, \
> }
>
> +#define ADS1115_V_CHAN(_chan, _addr) { \
> + .type = IIO_VOLTAGE, \
> + .indexed = 1, \
> + .address = _addr, \
> + .channel = _chan, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE) | \
> + BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_index = _addr, \
> + .scan_type = { \
> + .sign = 's', \
> + .realbits = 16, \
> + .storagebits = 16, \
> + .endianness = IIO_CPU, \
> + }, \
> +}
> +
> +#define ADS1115_V_DIFF_CHAN(_chan, _chan2, _addr) { \
> + .type = IIO_VOLTAGE, \
> + .differential = 1, \
> + .indexed = 1, \
> + .address = _addr, \
> + .channel = _chan, \
> + .channel2 = _chan2, \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> + BIT(IIO_CHAN_INFO_SCALE) | \
> + BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> + .scan_index = _addr, \
> + .scan_type = { \
> + .sign = 's', \
> + .realbits = 16, \
> + .storagebits = 16, \
> + .endianness = IIO_CPU, \
> + }, \
> +}
> +
> struct ads1015_data {
> struct regmap *regmap;
> /*
> @@ -157,6 +198,19 @@ static const struct iio_chan_spec ads1015_channels[] = {
> IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
> };
>
> +static const struct iio_chan_spec ads1115_channels[] = {
> + ADS1115_V_DIFF_CHAN(0, 1, ADS1015_AIN0_AIN1),
> + ADS1115_V_DIFF_CHAN(0, 3, ADS1015_AIN0_AIN3),
> + ADS1115_V_DIFF_CHAN(1, 3, ADS1015_AIN1_AIN3),
> + ADS1115_V_DIFF_CHAN(2, 3, ADS1015_AIN2_AIN3),
> + ADS1115_V_CHAN(0, ADS1015_AIN0),
> + ADS1115_V_CHAN(1, ADS1015_AIN1),
> + ADS1115_V_CHAN(2, ADS1015_AIN2),
> + ADS1115_V_CHAN(3, ADS1015_AIN3),
> + IIO_CHAN_SOFT_TIMESTAMP(ADS1015_TIMESTAMP),
> +};
> +
> +
> static int ads1015_set_power_state(struct ads1015_data *data, bool on)
> {
> int ret;
> @@ -291,7 +345,9 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
> mutex_lock(&indio_dev->mlock);
> mutex_lock(&data->lock);
> switch (mask) {
> - case IIO_CHAN_INFO_RAW:
> + case IIO_CHAN_INFO_RAW: {
> + int shift = chan->scan_type.shift;
> +
> if (iio_buffer_enabled(indio_dev)) {
> ret = -EBUSY;
> break;
> @@ -307,8 +363,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
> break;
> }
>
> - /* 12 bit res, D0 is bit 4 in conversion register */
> - *val = sign_extend32(*val >> 4, 11);
> + *val = sign_extend32(*val >> shift, 15 - shift);
>
> ret = ads1015_set_power_state(data, false);
> if (ret < 0)
> @@ -316,6 +371,7 @@ static int ads1015_read_raw(struct iio_dev *indio_dev,
>
> ret = IIO_VAL_INT;
> break;
> + }
> case IIO_CHAN_INFO_SCALE:
> idx = data->channel_data[chan->address].pga;
> *val = ads1015_scale[idx].scale;
> @@ -502,8 +558,16 @@ static int ads1015_probe(struct i2c_client *client,
> indio_dev->dev.parent = &client->dev;
> indio_dev->info = &ads1015_info;
> indio_dev->name = ADS1015_DRV_NAME;
> - indio_dev->channels = ads1015_channels;
> - indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
> +
> + switch (id->driver_data) {
> + case ADS1015:
> + indio_dev->channels = ads1015_channels;
> + break;
> + case ADS1115:
> + indio_dev->channels = ads1115_channels;
> + break;
> + }
> + indio_dev->num_channels = 9;
I'm not comfortable with this magic number here.
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