staging:iio:dac:ad5791 chan spec conversion.
Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Acked-by: Michael Hennerich <Michael.Hennerich@analog.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron
Greg Kroah-Hartman
parent
ade7ef7ba3
commit
c5b99396c7
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@ -72,48 +72,22 @@ static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val)
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return ret;
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}
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static ssize_t ad5791_write_dac(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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long readin;
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int ret;
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ret = strict_strtol(buf, 10, &readin);
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if (ret)
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return ret;
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readin += (1 << (st->chip_info->bits - 1));
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readin &= AD5791_RES_MASK(st->chip_info->bits);
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readin <<= st->chip_info->left_shift;
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ret = ad5791_spi_write(st->spi, this_attr->address, readin);
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return ret ? ret : len;
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#define AD5791_CHAN(bits, shift) { \
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.type = IIO_VOLTAGE, \
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.output = 1, \
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.indexed = 1, \
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.address = AD5791_ADDR_DAC0, \
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.channel = 0, \
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.info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), \
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.scan_type = IIO_ST('u', bits, 24, shift) \
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}
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static ssize_t ad5791_read_dac(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret;
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int val;
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ret = ad5791_spi_read(st->spi, this_attr->address, &val);
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if (ret)
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return ret;
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val &= AD5791_DAC_MASK;
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val >>= st->chip_info->left_shift;
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val -= (1 << (st->chip_info->bits - 1));
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return sprintf(buf, "%d\n", val);
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}
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static const struct iio_chan_spec ad5791_channels[] = {
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[ID_AD5760] = AD5791_CHAN(16, 4),
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[ID_AD5780] = AD5791_CHAN(18, 2),
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[ID_AD5781] = AD5791_CHAN(18, 2),
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[ID_AD5791] = AD5791_CHAN(20, 0)
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};
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static ssize_t ad5791_read_powerdown_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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@ -184,37 +158,6 @@ static ssize_t ad5791_write_dac_powerdown(struct device *dev,
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return ret ? ret : len;
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}
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static ssize_t ad5791_show_scale(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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/* Corresponds to Vref / 2^(bits) */
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unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
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return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
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}
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static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5791_show_scale, NULL, 0);
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static ssize_t ad5791_show_name(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
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}
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static IIO_DEVICE_ATTR(name, S_IRUGO, ad5791_show_name, NULL, 0);
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#define IIO_DEV_ATTR_OUT_RW_RAW(_num, _show, _store, _addr) \
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IIO_DEVICE_ATTR(out##_num##_raw, \
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S_IRUGO | S_IWUSR, _show, _store, _addr)
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static IIO_DEV_ATTR_OUT_RW_RAW(0, ad5791_read_dac,
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ad5791_write_dac, AD5791_ADDR_DAC0);
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static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO |
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S_IWUSR, ad5791_read_powerdown_mode,
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ad5791_write_powerdown_mode, 0);
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@ -230,12 +173,9 @@ static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5791_read_dac_powerdown,
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ad5791_write_dac_powerdown, 0);
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static struct attribute *ad5791_attributes[] = {
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&iio_dev_attr_out0_raw.dev_attr.attr,
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&iio_dev_attr_out0_powerdown.dev_attr.attr,
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&iio_dev_attr_out_powerdown_mode.dev_attr.attr,
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&iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
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&iio_dev_attr_out_scale.dev_attr.attr,
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&iio_dev_attr_name.dev_attr.attr,
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NULL,
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};
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@ -264,31 +204,74 @@ static int ad5780_get_lin_comp(unsigned int span)
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else
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return AD5780_LINCOMP_10_20;
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}
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static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
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[ID_AD5760] = {
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.bits = 16,
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.left_shift = 4,
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.get_lin_comp = ad5780_get_lin_comp,
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},
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[ID_AD5780] = {
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.bits = 18,
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.left_shift = 2,
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.get_lin_comp = ad5780_get_lin_comp,
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},
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[ID_AD5781] = {
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.bits = 18,
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.left_shift = 2,
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.get_lin_comp = ad5791_get_lin_comp,
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},
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[ID_AD5791] = {
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.bits = 20,
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.left_shift = 0,
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.get_lin_comp = ad5791_get_lin_comp,
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},
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};
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static int ad5791_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long m)
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{
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struct ad5791_state *st = iio_priv(indio_dev);
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int ret;
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switch (m) {
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case 0:
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ret = ad5791_spi_read(st->spi, chan->address, val);
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if (ret)
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return ret;
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*val &= AD5791_DAC_MASK;
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*val >>= chan->scan_type.shift;
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*val -= (1 << (chan->scan_type.storagebits - 1));
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return IIO_VAL_INT;
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case (1 << IIO_CHAN_INFO_SCALE_SHARED):
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*val = 0;
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*val2 = (st->vref_mv * 1000) >> chan->scan_type.storagebits;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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};
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static int ad5791_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val,
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int val2,
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long mask)
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{
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struct ad5791_state *st = iio_priv(indio_dev);
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switch (mask) {
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case 0:
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val += (1 << (chan->scan_type.storagebits - 1));
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val &= AD5791_RES_MASK(chan->scan_type.storagebits);
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val <<= chan->scan_type.shift;
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return ad5791_spi_write(st->spi, chan->address, val);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info ad5791_info = {
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.read_raw = &ad5791_read_raw,
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.write_raw = &ad5791_write_raw,
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.attrs = &ad5791_attribute_group,
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.driver_module = THIS_MODULE,
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};
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@ -338,8 +321,8 @@ static int __devinit ad5791_probe(struct spi_device *spi)
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if (ret)
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goto error_disable_reg_neg;
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st->chip_info =
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&ad5791_chip_info_tbl[spi_get_device_id(spi)->driver_data];
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st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi)
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->driver_data];
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st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
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@ -355,7 +338,10 @@ static int __devinit ad5791_probe(struct spi_device *spi)
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indio_dev->dev.parent = &spi->dev;
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indio_dev->info = &ad5791_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels
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= &ad5791_channels[spi_get_device_id(spi)->driver_data];
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indio_dev->num_channels = 1;
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indio_dev->name = spi_get_device_id(st->spi)->name;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_disable_reg_neg;
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@ -68,14 +68,10 @@ struct ad5791_platform_data {
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/**
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* struct ad5791_chip_info - chip specific information
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* @bits: accuracy of the DAC in bits
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* @left_shift: number of bits the datum must be shifted
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* @get_lin_comp: function pointer to the device specific function
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*/
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struct ad5791_chip_info {
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u8 bits;
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u8 left_shift;
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int (*get_lin_comp) (unsigned int span);
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};
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