From c5b99396c70a1287bd49813121da37a828f69d23 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Fri, 2 Sep 2011 17:25:19 +0100 Subject: [PATCH] staging:iio:dac:ad5791 chan spec conversion. Signed-off-by: Jonathan Cameron Acked-by: Michael Hennerich Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/dac/ad5791.c | 158 ++++++++++++++++++--------------------- drivers/staging/iio/dac/ad5791.h | 4 - 2 files changed, 72 insertions(+), 90 deletions(-) diff --git a/drivers/staging/iio/dac/ad5791.c b/drivers/staging/iio/dac/ad5791.c index 74f5406..6c34700 100644 --- a/drivers/staging/iio/dac/ad5791.c +++ b/drivers/staging/iio/dac/ad5791.c @@ -72,48 +72,22 @@ static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val) return ret; } -static ssize_t ad5791_write_dac(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t len) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_state *st = iio_priv(indio_dev); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - long readin; - int ret; - - ret = strict_strtol(buf, 10, &readin); - if (ret) - return ret; - - readin += (1 << (st->chip_info->bits - 1)); - readin &= AD5791_RES_MASK(st->chip_info->bits); - readin <<= st->chip_info->left_shift; - - ret = ad5791_spi_write(st->spi, this_attr->address, readin); - return ret ? ret : len; +#define AD5791_CHAN(bits, shift) { \ + .type = IIO_VOLTAGE, \ + .output = 1, \ + .indexed = 1, \ + .address = AD5791_ADDR_DAC0, \ + .channel = 0, \ + .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), \ + .scan_type = IIO_ST('u', bits, 24, shift) \ } -static ssize_t ad5791_read_dac(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_state *st = iio_priv(indio_dev); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - int ret; - int val; - - ret = ad5791_spi_read(st->spi, this_attr->address, &val); - if (ret) - return ret; - - val &= AD5791_DAC_MASK; - val >>= st->chip_info->left_shift; - val -= (1 << (st->chip_info->bits - 1)); - - return sprintf(buf, "%d\n", val); -} +static const struct iio_chan_spec ad5791_channels[] = { + [ID_AD5760] = AD5791_CHAN(16, 4), + [ID_AD5780] = AD5791_CHAN(18, 2), + [ID_AD5781] = AD5791_CHAN(18, 2), + [ID_AD5791] = AD5791_CHAN(20, 0) +}; static ssize_t ad5791_read_powerdown_mode(struct device *dev, struct device_attribute *attr, char *buf) @@ -184,37 +158,6 @@ static ssize_t ad5791_write_dac_powerdown(struct device *dev, return ret ? ret : len; } -static ssize_t ad5791_show_scale(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_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_scale, S_IRUGO, ad5791_show_scale, NULL, 0); - -static ssize_t ad5791_show_name(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ad5791_state *st = iio_priv(indio_dev); - - return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name); -} -static IIO_DEVICE_ATTR(name, S_IRUGO, ad5791_show_name, NULL, 0); - -#define IIO_DEV_ATTR_OUT_RW_RAW(_num, _show, _store, _addr) \ - IIO_DEVICE_ATTR(out##_num##_raw, \ - S_IRUGO | S_IWUSR, _show, _store, _addr) - -static IIO_DEV_ATTR_OUT_RW_RAW(0, ad5791_read_dac, - ad5791_write_dac, AD5791_ADDR_DAC0); - static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO | S_IWUSR, ad5791_read_powerdown_mode, ad5791_write_powerdown_mode, 0); @@ -230,12 +173,9 @@ static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5791_read_dac_powerdown, ad5791_write_dac_powerdown, 0); static struct attribute *ad5791_attributes[] = { - &iio_dev_attr_out0_raw.dev_attr.attr, &iio_dev_attr_out0_powerdown.dev_attr.attr, &iio_dev_attr_out_powerdown_mode.dev_attr.attr, &iio_const_attr_out_powerdown_mode_available.dev_attr.attr, - &iio_dev_attr_out_scale.dev_attr.attr, - &iio_dev_attr_name.dev_attr.attr, NULL, }; @@ -264,31 +204,74 @@ static int ad5780_get_lin_comp(unsigned int span) else return AD5780_LINCOMP_10_20; } - static const struct ad5791_chip_info ad5791_chip_info_tbl[] = { [ID_AD5760] = { - .bits = 16, - .left_shift = 4, .get_lin_comp = ad5780_get_lin_comp, }, [ID_AD5780] = { - .bits = 18, - .left_shift = 2, .get_lin_comp = ad5780_get_lin_comp, }, [ID_AD5781] = { - .bits = 18, - .left_shift = 2, .get_lin_comp = ad5791_get_lin_comp, }, [ID_AD5791] = { - .bits = 20, - .left_shift = 0, .get_lin_comp = ad5791_get_lin_comp, }, }; +static int ad5791_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad5791_state *st = iio_priv(indio_dev); + int ret; + + switch (m) { + case 0: + ret = ad5791_spi_read(st->spi, chan->address, val); + if (ret) + return ret; + *val &= AD5791_DAC_MASK; + *val >>= chan->scan_type.shift; + *val -= (1 << (chan->scan_type.storagebits - 1)); + return IIO_VAL_INT; + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + *val = 0; + *val2 = (st->vref_mv * 1000) >> chan->scan_type.storagebits; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } + +}; + + +static int ad5791_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ad5791_state *st = iio_priv(indio_dev); + + switch (mask) { + case 0: + val += (1 << (chan->scan_type.storagebits - 1)); + val &= AD5791_RES_MASK(chan->scan_type.storagebits); + val <<= chan->scan_type.shift; + + return ad5791_spi_write(st->spi, chan->address, val); + + default: + return -EINVAL; + } +} + static const struct iio_info ad5791_info = { + .read_raw = &ad5791_read_raw, + .write_raw = &ad5791_write_raw, .attrs = &ad5791_attribute_group, .driver_module = THIS_MODULE, }; @@ -338,8 +321,8 @@ static int __devinit ad5791_probe(struct spi_device *spi) if (ret) goto error_disable_reg_neg; - st->chip_info = - &ad5791_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi) + ->driver_data]; st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv)) @@ -355,7 +338,10 @@ static int __devinit ad5791_probe(struct spi_device *spi) indio_dev->dev.parent = &spi->dev; indio_dev->info = &ad5791_info; indio_dev->modes = INDIO_DIRECT_MODE; - + indio_dev->channels + = &ad5791_channels[spi_get_device_id(spi)->driver_data]; + indio_dev->num_channels = 1; + indio_dev->name = spi_get_device_id(st->spi)->name; ret = iio_device_register(indio_dev); if (ret) goto error_disable_reg_neg; diff --git a/drivers/staging/iio/dac/ad5791.h b/drivers/staging/iio/dac/ad5791.h index c807f26..2a50a11 100644 --- a/drivers/staging/iio/dac/ad5791.h +++ b/drivers/staging/iio/dac/ad5791.h @@ -68,14 +68,10 @@ struct ad5791_platform_data { /** * struct ad5791_chip_info - chip specific information - * @bits: accuracy of the DAC in bits - * @left_shift: number of bits the datum must be shifted * @get_lin_comp: function pointer to the device specific function */ struct ad5791_chip_info { - u8 bits; - u8 left_shift; int (*get_lin_comp) (unsigned int span); }; -- 2.7.4