diff options
Diffstat (limited to 'drivers/staging/iio/dac/ad5624r_spi.c')
| -rw-r--r-- | drivers/staging/iio/dac/ad5624r_spi.c | 127 |
1 files changed, 78 insertions, 49 deletions
diff --git a/drivers/staging/iio/dac/ad5624r_spi.c b/drivers/staging/iio/dac/ad5624r_spi.c index 6e05f0dbae0b..10c7484366ef 100644 --- a/drivers/staging/iio/dac/ad5624r_spi.c +++ b/drivers/staging/iio/dac/ad5624r_spi.c @@ -21,29 +21,51 @@ #include "dac.h" #include "ad5624r.h" +#define AD5624R_CHANNEL(_chan, _bits) { \ + .type = IIO_VOLTAGE, \ + .indexed = 1, \ + .output = 1, \ + .channel = (_chan), \ + .info_mask = IIO_CHAN_INFO_SCALE_SHARED_BIT, \ + .address = (_chan), \ + .scan_type = IIO_ST('u', (_bits), 16, 16 - (_bits)), \ +} + +#define DECLARE_AD5624R_CHANNELS(_name, _bits) \ + const struct iio_chan_spec _name##_channels[] = { \ + AD5624R_CHANNEL(0, _bits), \ + AD5624R_CHANNEL(1, _bits), \ + AD5624R_CHANNEL(2, _bits), \ + AD5624R_CHANNEL(3, _bits), \ +} + +static DECLARE_AD5624R_CHANNELS(ad5624r, 12); +static DECLARE_AD5624R_CHANNELS(ad5644r, 14); +static DECLARE_AD5624R_CHANNELS(ad5664r, 16); + static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = { [ID_AD5624R3] = { - .bits = 12, - .int_vref_mv = 1250, - }, - [ID_AD5644R3] = { - .bits = 14, - .int_vref_mv = 1250, - }, - [ID_AD5664R3] = { - .bits = 16, + .channels = ad5624r_channels, .int_vref_mv = 1250, }, [ID_AD5624R5] = { - .bits = 12, + .channels = ad5624r_channels, .int_vref_mv = 2500, }, + [ID_AD5644R3] = { + .channels = ad5644r_channels, + .int_vref_mv = 1250, + }, [ID_AD5644R5] = { - .bits = 14, + .channels = ad5644r_channels, .int_vref_mv = 2500, }, + [ID_AD5664R3] = { + .channels = ad5664r_channels, + .int_vref_mv = 1250, + }, [ID_AD5664R5] = { - .bits = 16, + .channels = ad5664r_channels, .int_vref_mv = 2500, }, }; @@ -70,24 +92,49 @@ static int ad5624r_spi_write(struct spi_device *spi, return spi_write(spi, msg, 3); } -static ssize_t ad5624r_write_dac(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) +static int ad5624r_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) { - long readin; - int ret; - struct iio_dev *indio_dev = dev_get_drvdata(dev); struct ad5624r_state *st = iio_priv(indio_dev); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); + unsigned long scale_uv; - ret = strict_strtol(buf, 10, &readin); - if (ret) - return ret; + switch (m) { + case IIO_CHAN_INFO_SCALE: + scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits; + *val = scale_uv / 1000; + *val2 = (scale_uv % 1000) * 1000; + return IIO_VAL_INT_PLUS_MICRO; - ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, - this_attr->address, readin, - st->chip_info->bits); - return ret ? ret : len; + } + return -EINVAL; +} + +static int ad5624r_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ad5624r_state *st = iio_priv(indio_dev); + int ret; + + switch (mask) { + case 0: + if (val >= (1 << chan->scan_type.realbits) || val < 0) + return -EINVAL; + + return ad5624r_spi_write(st->us, + AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, + chan->address, val, + chan->scan_type.shift); + default: + ret = -EINVAL; + } + + return -EINVAL; } static ssize_t ad5624r_read_powerdown_mode(struct device *dev, @@ -161,24 +208,6 @@ static ssize_t ad5624r_write_dac_powerdown(struct device *dev, return ret ? ret : len; } -static ssize_t ad5624r_show_scale(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5624r_state *st = iio_priv(indio_dev); - /* Corresponds to Vref / 2^(bits) */ - unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits; - - return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000); -} -static IIO_DEVICE_ATTR(out_voltage_scale, S_IRUGO, ad5624r_show_scale, NULL, 0); - -static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0); -static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1); -static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2); -static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3); - static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO | S_IWUSR, ad5624r_read_powerdown_mode, ad5624r_write_powerdown_mode, 0); @@ -200,17 +229,12 @@ static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown, ad5624r_write_dac_powerdown, 3); static struct attribute *ad5624r_attributes[] = { - &iio_dev_attr_out_voltage0_raw.dev_attr.attr, - &iio_dev_attr_out_voltage1_raw.dev_attr.attr, - &iio_dev_attr_out_voltage2_raw.dev_attr.attr, - &iio_dev_attr_out_voltage3_raw.dev_attr.attr, &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr, &iio_dev_attr_out_voltage1_powerdown.dev_attr.attr, &iio_dev_attr_out_voltage2_powerdown.dev_attr.attr, &iio_dev_attr_out_voltage3_powerdown.dev_attr.attr, &iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr, &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr, - &iio_dev_attr_out_voltage_scale.dev_attr.attr, NULL, }; @@ -219,6 +243,8 @@ static const struct attribute_group ad5624r_attribute_group = { }; static const struct iio_info ad5624r_info = { + .write_raw = ad5624r_write_raw, + .read_raw = ad5624r_read_raw, .attrs = &ad5624r_attribute_group, .driver_module = THIS_MODULE, }; @@ -259,6 +285,8 @@ static int __devinit ad5624r_probe(struct spi_device *spi) indio_dev->name = spi_get_device_id(spi)->name; indio_dev->info = &ad5624r_info; indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = st->chip_info->channels; + indio_dev->num_channels = AD5624R_DAC_CHANNELS; ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, !!voltage_uv, 16); @@ -307,6 +335,7 @@ static const struct spi_device_id ad5624r_id[] = { {"ad5664r5", ID_AD5664R5}, {} }; +MODULE_DEVICE_TABLE(spi, ad5624r_id); static struct spi_driver ad5624r_driver = { .driver = { |