staging: IIO: DAC: New driver for AD5791/AD5781 High Resolution Voltage Output DACs
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
9886eb59f8
commit
69d900a695
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@ -31,6 +31,16 @@ config AD5504
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To compile this driver as a module, choose M here: the
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module will be called ad5504.
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config AD5791
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tristate "Analog Devices AD5781/AD5791 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 AD5781, AD5791,
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High Resolution Voltage Output Digital to Analog Converter.
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To compile this driver as a module, choose M here: the
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module will be called ad5791.
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config MAX517
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tristate "Maxim MAX517/518/519 DAC driver"
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depends on I2C && EXPERIMENTAL
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@ -5,4 +5,5 @@
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obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
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obj-$(CONFIG_AD5504) += ad5504.o
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obj-$(CONFIG_AD5446) += ad5446.o
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obj-$(CONFIG_AD5791) += ad5791.o
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obj-$(CONFIG_MAX517) += max517.o
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@ -0,0 +1,418 @@
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/*
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* AD5791, AD5791 Voltage Output Digital to Analog Converter
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*
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* Copyright 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/regulator/consumer.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "dac.h"
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#include "ad5791.h"
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static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val)
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{
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union {
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u32 d32;
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u8 d8[4];
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} data;
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data.d32 = cpu_to_be32(AD5791_CMD_WRITE |
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AD5791_ADDR(addr) |
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(val & AD5791_DAC_MASK));
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return spi_write(spi, &data.d8[1], 3);
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}
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static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val)
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{
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union {
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u32 d32;
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u8 d8[4];
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} data[3];
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int ret;
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struct spi_message msg;
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struct spi_transfer xfers[] = {
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{
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.tx_buf = &data[0].d8[1],
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.bits_per_word = 8,
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.len = 3,
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.cs_change = 1,
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}, {
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.tx_buf = &data[1].d8[1],
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.rx_buf = &data[2].d8[1],
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.bits_per_word = 8,
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.len = 3,
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},
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};
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data[0].d32 = cpu_to_be32(AD5791_CMD_READ |
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AD5791_ADDR(addr));
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data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));
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spi_message_init(&msg);
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spi_message_add_tail(&xfers[0], &msg);
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spi_message_add_tail(&xfers[1], &msg);
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ret = spi_sync(spi, &msg);
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*val = be32_to_cpu(data[2].d32);
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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_dev_get_devdata(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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}
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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_dev_get_devdata(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 ssize_t ad5791_read_powerdown_mode(struct device *dev,
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struct device_attribute *attr, 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_dev_get_devdata(indio_dev);
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const char mode[][14] = {"6kohm_to_gnd", "three_state"};
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return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
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}
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static ssize_t ad5791_write_powerdown_mode(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_dev_get_devdata(indio_dev);
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int ret;
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if (sysfs_streq(buf, "6kohm_to_gnd"))
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st->pwr_down_mode = AD5791_DAC_PWRDN_6K;
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else if (sysfs_streq(buf, "three_state"))
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st->pwr_down_mode = AD5791_DAC_PWRDN_3STATE;
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else
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ret = -EINVAL;
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return ret ? ret : len;
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}
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static ssize_t ad5791_read_dac_powerdown(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_dev_get_devdata(indio_dev);
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return sprintf(buf, "%d\n", st->pwr_down);
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}
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static ssize_t ad5791_write_dac_powerdown(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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long readin;
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int ret;
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5791_state *st = iio_dev_get_devdata(indio_dev);
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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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if (readin == 0) {
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st->pwr_down = false;
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st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
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} else if (readin == 1) {
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st->pwr_down = true;
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if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)
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st->ctrl |= AD5791_CTRL_OPGND;
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else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)
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st->ctrl |= AD5791_CTRL_DACTRI;
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} else
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ret = -EINVAL;
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ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl);
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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_dev_get_devdata(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_dev_get_devdata(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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static IIO_CONST_ATTR(out_powerdown_mode_available,
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"6kohm_to_gnd three_state");
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#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
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IIO_DEVICE_ATTR(out##_num##_powerdown, \
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S_IRUGO | S_IWUSR, _show, _store, _addr)
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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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static const struct attribute_group ad5791_attribute_group = {
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.attrs = ad5791_attributes,
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};
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static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
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[ID_AD5791] = {
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.bits = 20,
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.left_shift = 0,
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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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},
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};
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static int ad5791_get_lin_comp(unsigned int span)
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{
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if (span <= 10000)
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return AD5791_LINCOMP_0_10;
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else if (span <= 12000)
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return AD5791_LINCOMP_10_12;
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else if (span <= 16000)
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return AD5791_LINCOMP_12_16;
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else if (span <= 19000)
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return AD5791_LINCOMP_16_19;
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else
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return AD5791_LINCOMP_19_20;
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}
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static int __devinit ad5791_probe(struct spi_device *spi)
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{
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struct ad5791_platform_data *pdata = spi->dev.platform_data;
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struct ad5791_state *st;
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int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
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st = kzalloc(sizeof(*st), GFP_KERNEL);
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if (st == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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spi_set_drvdata(spi, st);
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st->reg_vdd = regulator_get(&spi->dev, "vdd");
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if (!IS_ERR(st->reg_vdd)) {
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ret = regulator_enable(st->reg_vdd);
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if (ret)
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goto error_put_reg_pos;
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pos_voltage_uv = regulator_get_voltage(st->reg_vdd);
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}
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st->reg_vss = regulator_get(&spi->dev, "vss");
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if (!IS_ERR(st->reg_vss)) {
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ret = regulator_enable(st->reg_vss);
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if (ret)
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goto error_put_reg_neg;
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neg_voltage_uv = regulator_get_voltage(st->reg_vss);
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}
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if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd))
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st->vref_mv = (pos_voltage_uv - neg_voltage_uv) / 1000;
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else if (pdata)
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st->vref_mv = pdata->vref_pos_mv - pdata->vref_neg_mv;
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else
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dev_warn(&spi->dev, "reference voltage unspecified\n");
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ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
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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->ctrl = AD5761_CTRL_LINCOMP(ad5791_get_lin_comp(st->vref_mv)) |
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((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
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AD5791_CTRL_BIN2SC;
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ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl |
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AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
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if (ret)
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goto error_disable_reg_neg;
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st->pwr_down = true;
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st->spi = spi;
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st->indio_dev = iio_allocate_device();
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if (st->indio_dev == NULL) {
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ret = -ENOMEM;
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goto error_disable_reg_neg;
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}
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st->indio_dev->dev.parent = &spi->dev;
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st->indio_dev->dev_data = (void *)(st);
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st->indio_dev->attrs = &ad5791_attribute_group;
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st->indio_dev->driver_module = THIS_MODULE;
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st->indio_dev->modes = INDIO_DIRECT_MODE;
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ret = iio_device_register(st->indio_dev);
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if (ret)
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goto error_free_dev;
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return 0;
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error_free_dev:
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iio_free_device(st->indio_dev);
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error_disable_reg_neg:
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if (!IS_ERR(st->reg_vss))
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regulator_disable(st->reg_vss);
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error_put_reg_neg:
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if (!IS_ERR(st->reg_vss))
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regulator_put(st->reg_vss);
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if (!IS_ERR(st->reg_vdd))
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regulator_disable(st->reg_vdd);
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error_put_reg_pos:
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if (!IS_ERR(st->reg_vdd))
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regulator_put(st->reg_vdd);
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kfree(st);
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error_ret:
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return ret;
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}
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static int __devexit ad5791_remove(struct spi_device *spi)
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{
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struct ad5791_state *st = spi_get_drvdata(spi);
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iio_device_unregister(st->indio_dev);
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if (!IS_ERR(st->reg_vdd)) {
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regulator_disable(st->reg_vdd);
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regulator_put(st->reg_vdd);
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}
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if (!IS_ERR(st->reg_vss)) {
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regulator_disable(st->reg_vss);
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regulator_put(st->reg_vss);
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}
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kfree(st);
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return 0;
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}
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static const struct spi_device_id ad5791_id[] = {
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{"ad5791", ID_AD5791},
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{"ad5781", ID_AD5781},
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{}
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};
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static struct spi_driver ad5791_driver = {
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.driver = {
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.name = "ad5791",
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.owner = THIS_MODULE,
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},
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.probe = ad5791_probe,
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.remove = __devexit_p(ad5791_remove),
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.id_table = ad5791_id,
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};
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static __init int ad5791_spi_init(void)
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{
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return spi_register_driver(&ad5791_driver);
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}
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module_init(ad5791_spi_init);
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static __exit void ad5791_spi_exit(void)
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{
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spi_unregister_driver(&ad5791_driver);
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}
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module_exit(ad5791_spi_exit);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Analog Devices AD5791/AD5781 DAC");
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MODULE_LICENSE("GPL v2");
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@ -0,0 +1,109 @@
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/*
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* AD5791 SPI DAC driver
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*
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* Copyright 2011 Analog Devices Inc.
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*
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||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#ifndef SPI_AD5791_H_
|
||||
#define SPI_AD5791_H_
|
||||
|
||||
#define AD5791_RES_MASK(x) ((1 << (x)) - 1)
|
||||
#define AD5791_DAC_MASK AD5791_RES_MASK(20)
|
||||
#define AD5791_DAC_MSB (1 << 19)
|
||||
|
||||
#define AD5791_CMD_READ (1 << 23)
|
||||
#define AD5791_CMD_WRITE (0 << 23)
|
||||
#define AD5791_ADDR(addr) ((addr) << 20)
|
||||
|
||||
/* Registers */
|
||||
#define AD5791_ADDR_NOOP 0
|
||||
#define AD5791_ADDR_DAC0 1
|
||||
#define AD5791_ADDR_CTRL 2
|
||||
#define AD5791_ADDR_CLRCODE 3
|
||||
#define AD5791_ADDR_SW_CTRL 4
|
||||
|
||||
/* Control Register */
|
||||
#define AD5791_CTRL_RBUF (1 << 1)
|
||||
#define AD5791_CTRL_OPGND (1 << 2)
|
||||
#define AD5791_CTRL_DACTRI (1 << 3)
|
||||
#define AD5791_CTRL_BIN2SC (1 << 4)
|
||||
#define AD5791_CTRL_SDODIS (1 << 5)
|
||||
#define AD5761_CTRL_LINCOMP(x) ((x) << 6)
|
||||
|
||||
#define AD5791_LINCOMP_0_10 0
|
||||
#define AD5791_LINCOMP_10_12 1
|
||||
#define AD5791_LINCOMP_12_16 2
|
||||
#define AD5791_LINCOMP_16_19 3
|
||||
#define AD5791_LINCOMP_19_20 12
|
||||
|
||||
/* Software Control Register */
|
||||
#define AD5791_SWCTRL_LDAC (1 << 0)
|
||||
#define AD5791_SWCTRL_CLR (1 << 1)
|
||||
#define AD5791_SWCTRL_RESET (1 << 2)
|
||||
|
||||
#define AD5791_DAC_PWRDN_6K 0
|
||||
#define AD5791_DAC_PWRDN_3STATE 1
|
||||
|
||||
/*
|
||||
* TODO: struct ad5791_platform_data needs to go into include/linux/iio
|
||||
*/
|
||||
|
||||
/**
|
||||
* struct ad5791_platform_data - platform specific information
|
||||
* @vref_pos_mv: Vdd Positive Analog Supply Volatge (mV)
|
||||
* @vref_neg_mv: Vdd Negative Analog Supply Volatge (mV)
|
||||
* @use_rbuf_gain2: ext. amplifier connected in gain of two configuration
|
||||
*/
|
||||
|
||||
struct ad5791_platform_data {
|
||||
u16 vref_pos_mv;
|
||||
u16 vref_neg_mv;
|
||||
bool use_rbuf_gain2;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ad5791_chip_info - chip specific information
|
||||
* @bits: accuracy of the DAC in bits
|
||||
* @left_shift: number of bits the datum must be shifted
|
||||
*/
|
||||
|
||||
struct ad5791_chip_info {
|
||||
u8 bits;
|
||||
u8 left_shift;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ad5791_state - driver instance specific data
|
||||
* @indio_dev: the industrial I/O device
|
||||
* @us: spi_device
|
||||
* @reg_vdd: positive supply regulator
|
||||
* @reg_vss: negative supply regulator
|
||||
* @chip_info: chip model specific constants
|
||||
* @vref_mv: actual reference voltage used
|
||||
* @pwr_down_mode current power down mode
|
||||
*/
|
||||
|
||||
struct ad5791_state {
|
||||
struct iio_dev *indio_dev;
|
||||
struct spi_device *spi;
|
||||
struct regulator *reg_vdd;
|
||||
struct regulator *reg_vss;
|
||||
const struct ad5791_chip_info *chip_info;
|
||||
unsigned short vref_mv;
|
||||
unsigned ctrl;
|
||||
unsigned pwr_down_mode;
|
||||
bool pwr_down;
|
||||
};
|
||||
|
||||
/**
|
||||
* ad5791_supported_device_ids:
|
||||
*/
|
||||
|
||||
enum ad5791_supported_device_ids {
|
||||
ID_AD5791,
|
||||
ID_AD5781,
|
||||
};
|
||||
|
||||
#endif /* SPI_AD5791_H_ */
|
||||
Loading…
Reference in New Issue