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staging: iio: dac: ad5446: Enable driver support for AD5620/AD5640/AD5660 DA converters
Initial support for single channel, 12-/14-/16-Bit nanoDAC with On-Chip Reference staging: iio: dac: ad5446: Fix according to review feedback Review feedback by Jonathan Cameron: Use kernel doc style to document headers. Turn data into a union Add some comments for clarity Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich
Greg Kroah-Hartman
parent
f386caa3cd
commit
d846263da4
@ -11,11 +11,11 @@ config AD5624R_SPI
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AD5664R convertors (DAC). This driver uses the common SPI interface.
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config AD5446
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tristate "Analog Devices AD5444, AD5446 and AD5541A, AD5512A DAC SPI driver"
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tristate "Analog Devices AD5444/6, AD5620/40/60 and AD5541A/12A DAC SPI driver"
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depends on SPI
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help
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Say yes here to build support for Analog Devices AD5444, AD5446
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and AD5541A, AD5512A DACs.
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Say yes here to build support for Analog Devices AD5444, AD5446,
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AD5620, AD5640, AD5660 and AD5541A, AD5512A DACs.
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To compile this driver as a module, choose M here: the
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module will be called ad5446.
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@ -23,6 +23,31 @@
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#include "ad5446.h"
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static void ad5446_store_sample(struct ad5446_state *st, unsigned val)
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{
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st->data.d16 = cpu_to_be16(AD5446_LOAD |
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(val << st->chip_info->left_shift));
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}
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static void ad5542_store_sample(struct ad5446_state *st, unsigned val)
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{
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st->data.d16 = cpu_to_be16(val << st->chip_info->left_shift);
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}
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static void ad5620_store_sample(struct ad5446_state *st, unsigned val)
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{
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st->data.d16 = cpu_to_be16(AD5620_LOAD |
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(val << st->chip_info->left_shift));
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}
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static void ad5660_store_sample(struct ad5446_state *st, unsigned val)
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{
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val |= AD5660_LOAD;
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st->data.d24[0] = (val >> 16) & 0xFF;
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st->data.d24[1] = (val >> 8) & 0xFF;
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st->data.d24[2] = val & 0xFF;
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}
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static ssize_t ad5446_write(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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@ -43,18 +68,7 @@ static ssize_t ad5446_write(struct device *dev,
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}
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mutex_lock(&dev_info->mlock);
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switch (spi_get_device_id(st->spi)->driver_data) {
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case ID_AD5444:
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case ID_AD5446:
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st->data = cpu_to_be16(AD5446_LOAD |
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(val << st->chip_info->left_shift));
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break;
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case ID_AD5542A:
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case ID_AD5512A:
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st->data = cpu_to_be16(val << st->chip_info->left_shift);
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break;
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}
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st->chip_info->store_sample(st, val);
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ret = spi_sync(st->spi, &st->msg);
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mutex_unlock(&dev_info->mlock);
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@ -105,24 +119,76 @@ static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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.storagebits = 16,
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.left_shift = 2,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.store_sample = ad5446_store_sample,
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},
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[ID_AD5446] = {
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.bits = 14,
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.storagebits = 16,
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.left_shift = 0,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.store_sample = ad5446_store_sample,
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},
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[ID_AD5542A] = {
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.bits = 16,
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.storagebits = 16,
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.left_shift = 0,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.store_sample = ad5542_store_sample,
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},
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[ID_AD5512A] = {
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.bits = 12,
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.storagebits = 16,
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.left_shift = 4,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.store_sample = ad5542_store_sample,
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},
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[ID_AD5620_2500] = {
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.bits = 12,
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.storagebits = 16,
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.left_shift = 2,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.int_vref_mv = 2500,
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.store_sample = ad5620_store_sample,
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},
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[ID_AD5620_1250] = {
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.bits = 12,
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.storagebits = 16,
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.left_shift = 2,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.int_vref_mv = 1250,
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.store_sample = ad5620_store_sample,
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},
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[ID_AD5640_2500] = {
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.bits = 14,
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.storagebits = 16,
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.left_shift = 0,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.int_vref_mv = 2500,
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.store_sample = ad5620_store_sample,
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},
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[ID_AD5640_1250] = {
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.bits = 14,
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.storagebits = 16,
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.left_shift = 0,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.int_vref_mv = 1250,
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.store_sample = ad5620_store_sample,
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},
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[ID_AD5660_2500] = {
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.bits = 16,
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.storagebits = 24,
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.left_shift = 0,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.int_vref_mv = 2500,
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.store_sample = ad5660_store_sample,
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},
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[ID_AD5660_1250] = {
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.bits = 16,
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.storagebits = 24,
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.left_shift = 0,
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.sign = 'u', /* IIO_SCAN_EL_TYPE_UNSIGNED */
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.int_vref_mv = 1250,
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.store_sample = ad5660_store_sample,
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},
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};
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@ -168,16 +234,28 @@ static int __devinit ad5446_probe(struct spi_device *spi)
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/* Setup default message */
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st->xfer.tx_buf = &st->data,
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st->xfer.len = 2,
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st->xfer.tx_buf = &st->data;
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st->xfer.len = st->chip_info->storagebits / 8;
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spi_message_init(&st->msg);
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spi_message_add_tail(&st->xfer, &st->msg);
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if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else
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dev_warn(&spi->dev, "reference voltage unspecified\n");
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switch (spi_get_device_id(spi)->driver_data) {
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case ID_AD5620_2500:
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case ID_AD5620_1250:
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case ID_AD5640_2500:
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case ID_AD5640_1250:
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case ID_AD5660_2500:
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case ID_AD5660_1250:
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st->vref_mv = st->chip_info->int_vref_mv;
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break;
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default:
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if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else
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dev_warn(&spi->dev,
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"reference voltage unspecified\n");
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}
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ret = iio_device_register(st->indio_dev);
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if (ret)
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@ -217,6 +295,12 @@ static const struct spi_device_id ad5446_id[] = {
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{"ad5446", ID_AD5446},
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{"ad5542a", ID_AD5542A},
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{"ad5512a", ID_AD5512A},
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{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
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{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
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{"ad5640-2500", ID_AD5640_2500},
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{"ad5640-1250", ID_AD5640_1250},
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{"ad5660-2500", ID_AD5660_2500},
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{"ad5660-1250", ID_AD5660_1250},
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{}
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};
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@ -5,8 +5,8 @@
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef IIO_ADC_AD5446_H_
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#define IIO_ADC_AD5446_H_
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#ifndef IIO_DAC_AD5446_H_
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#define IIO_DAC_AD5446_H_
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/* DAC Control Bits */
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@ -15,14 +15,30 @@
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#define AD5446_NOP (0x2 << 14) /* No operation */
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#define AD5446_CLK_RISING (0x3 << 14) /* Clock data on rising edge */
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#define AD5620_LOAD (0x0 << 14) /* Load and update Norm Operation*/
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#define AD5620_PWRDWN_1k (0x1 << 14) /* Power-down: 1kOhm to GND */
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#define AD5620_PWRDWN_100k (0x2 << 14) /* Power-down: 100kOhm to GND */
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#define AD5620_PWRDWN_TRISTATE (0x3 << 14) /* Power-down: Three-state */
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#define AD5660_LOAD (0x0 << 16) /* Load and update Norm Operation*/
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#define AD5660_PWRDWN_1k (0x1 << 16) /* Power-down: 1kOhm to GND */
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#define AD5660_PWRDWN_100k (0x2 << 16) /* Power-down: 100kOhm to GND */
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#define AD5660_PWRDWN_TRISTATE (0x3 << 16) /* Power-down: Three-state */
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#define RES_MASK(bits) ((1 << (bits)) - 1)
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struct ad5446_chip_info {
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u8 bits; /* number of DAC bits */
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u8 storagebits; /* number of bits written to the DAC */
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u8 left_shift; /* number of bits the datum must be shifted */
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char sign; /* [s]igned or [u]nsigned */
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};
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/**
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* struct ad5446_state - driver instance specific data
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* @indio_dev: the industrial I/O device
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* @spi: spi_device
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* @chip_info: chip model specific constants, available modes etc
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* @reg: supply regulator
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* @poll_work: bottom half of polling interrupt handler
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* @vref_mv: actual reference voltage used
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* @xfer: default spi transfer
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* @msg: default spi message
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* @data: spi transmit buffer
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*/
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struct ad5446_state {
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struct iio_dev *indio_dev;
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@ -33,14 +49,50 @@ struct ad5446_state {
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unsigned short vref_mv;
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struct spi_transfer xfer;
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struct spi_message msg;
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unsigned short data;
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union {
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unsigned short d16;
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unsigned char d24[3];
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} data;
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};
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/**
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* struct ad5446_chip_info - chip specifc information
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* @bits: accuracy of the DAC in bits
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* @storagebits: number of bits written to the DAC
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* @left_shift: number of bits the datum must be shifted
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* @sign: data representation [s]igned or [u]nsigned
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* @int_vref_mv: AD5620/40/60: the internal reference voltage
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* @store_sample: chip specifc helper function to store the datum
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*/
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struct ad5446_chip_info {
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u8 bits;
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u8 storagebits;
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u8 left_shift;
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char sign;
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u16 int_vref_mv;
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void (*store_sample) (struct ad5446_state *st, unsigned val);
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};
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/**
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* ad5446_supported_device_ids:
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* The AD5620/40/60 parts are available in different fixed internal reference
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* voltage options. The actual part numbers may look differently
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* (and a bit cryptic), however this style is used to make clear which
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* parts are supported here.
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*/
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enum ad5446_supported_device_ids {
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ID_AD5444,
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ID_AD5446,
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ID_AD5542A,
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ID_AD5512A,
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ID_AD5620_2500,
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ID_AD5620_1250,
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ID_AD5640_2500,
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ID_AD5640_1250,
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ID_AD5660_2500,
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ID_AD5660_1250,
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};
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#endif /* IIO_ADC_AD5446_H_ */
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#endif /* IIO_DAC_AD5446_H_ */
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