staging:iio:dac:ad5791 chan spec conversion. (c5b99396) · Commits · EulixOS / Software / Kernel

drivers/staging/iio/dac/ad5791.c

+72 −86

Original line number	Diff line number	Diff line
		@@ -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;

drivers/staging/iio/dac/ad5791.h

+0 −4

Original line number	Diff line number	Diff line
		@@ -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);
		};