staging:iio:dac: Add AD5064 driver
This patch adds support for the Analog Devices AD6064, AD6064-1, AD6044, AD6024 quad channel digital-to-analog converter devices. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Lars-Peter Clausen
Greg Kroah-Hartman
parent
fcde2bf0b9
commit
fcf265d68d
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@ -3,6 +3,16 @@
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#
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#
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menu "Digital to analog convertors"
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menu "Digital to analog convertors"
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config AD5064
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tristate "Analog Devices AD5064/64-1/44/24 DAC 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 AD5064, AD5064-1,
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AD5044, AD5024 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 ad5064.
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config AD5624R_SPI
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config AD5624R_SPI
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tristate "Analog Devices AD5624/44/64R DAC spi driver"
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tristate "Analog Devices AD5624/44/64R DAC spi driver"
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depends on SPI
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depends on SPI
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@ -3,6 +3,7 @@
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#
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#
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obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
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obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
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obj-$(CONFIG_AD5064) += ad5064.o
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obj-$(CONFIG_AD5504) += ad5504.o
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obj-$(CONFIG_AD5504) += ad5504.o
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obj-$(CONFIG_AD5446) += ad5446.o
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obj-$(CONFIG_AD5446) += ad5446.o
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obj-$(CONFIG_AD5791) += ad5791.o
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obj-$(CONFIG_AD5791) += ad5791.o
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@ -0,0 +1,463 @@
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/*
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* AD5064, AD5064-1, AD5044, AD5024 Digital to analog converters 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.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/module.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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#define AD5064_DAC_CHANNELS 4
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#define AD5064_ADDR(x) ((x) << 20)
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#define AD5064_CMD(x) ((x) << 24)
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#define AD5064_ADDR_DAC(chan) (chan)
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#define AD5064_ADDR_ALL_DAC 0xF
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#define AD5064_CMD_WRITE_INPUT_N 0x0
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#define AD5064_CMD_UPDATE_DAC_N 0x1
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#define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2
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#define AD5064_CMD_WRITE_INPUT_N_UPDATE_N 0x3
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#define AD5064_CMD_POWERDOWN_DAC 0x4
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#define AD5064_CMD_CLEAR 0x5
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#define AD5064_CMD_LDAC_MASK 0x6
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#define AD5064_CMD_RESET 0x7
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#define AD5064_CMD_DAISY_CHAIN_ENABLE 0x8
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#define AD5064_LDAC_PWRDN_NONE 0x0
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#define AD5064_LDAC_PWRDN_1K 0x1
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#define AD5064_LDAC_PWRDN_100K 0x2
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#define AD5064_LDAC_PWRDN_3STATE 0x3
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/**
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* struct ad5064_chip_info - chip specific information
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* @shared_vref: whether the vref supply is shared between channels
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* @channel: channel specification
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*/
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struct ad5064_chip_info {
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bool shared_vref;
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struct iio_chan_spec channel[AD5064_DAC_CHANNELS];
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};
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/**
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* struct ad5064_state - driver instance specific data
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* @spi: spi_device
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* @chip_info: chip model specific constants, available modes etc
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* @vref_reg: vref supply regulators
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* @pwr_down: whether channel is powered down
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* @pwr_down_mode: channel's current power down mode
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* @dac_cache: current DAC raw value (chip does not support readback)
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* @data: spi transfer buffers
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*/
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struct ad5064_state {
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struct spi_device *spi;
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const struct ad5064_chip_info *chip_info;
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struct regulator_bulk_data vref_reg[AD5064_DAC_CHANNELS];
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bool pwr_down[AD5064_DAC_CHANNELS];
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u8 pwr_down_mode[AD5064_DAC_CHANNELS];
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unsigned int dac_cache[AD5064_DAC_CHANNELS];
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/*
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* DMA (thus cache coherency maintenance) requires the
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* transfer buffers to live in their own cache lines.
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*/
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__be32 data ____cacheline_aligned;
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};
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enum ad5064_type {
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ID_AD5024,
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ID_AD5044,
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ID_AD5064,
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ID_AD5064_1,
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};
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#define AD5064_CHANNEL(chan, bits) { \
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.type = IIO_VOLTAGE, \
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.indexed = 1, \
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.output = 1, \
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.channel = (chan), \
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.info_mask = (1 << IIO_CHAN_INFO_SCALE_SEPARATE), \
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.address = AD5064_ADDR_DAC(chan), \
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.scan_type = IIO_ST('u', (bits), 16, 20 - (bits)) \
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}
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static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
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[ID_AD5024] = {
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.shared_vref = false,
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.channel[0] = AD5064_CHANNEL(0, 12),
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.channel[1] = AD5064_CHANNEL(1, 12),
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.channel[2] = AD5064_CHANNEL(2, 12),
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.channel[3] = AD5064_CHANNEL(3, 12),
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},
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[ID_AD5044] = {
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.shared_vref = false,
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.channel[0] = AD5064_CHANNEL(0, 14),
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.channel[1] = AD5064_CHANNEL(1, 14),
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.channel[2] = AD5064_CHANNEL(2, 14),
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.channel[3] = AD5064_CHANNEL(3, 14),
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},
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[ID_AD5064] = {
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.shared_vref = false,
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.channel[0] = AD5064_CHANNEL(0, 16),
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.channel[1] = AD5064_CHANNEL(1, 16),
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.channel[2] = AD5064_CHANNEL(2, 16),
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.channel[3] = AD5064_CHANNEL(3, 16),
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},
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[ID_AD5064_1] = {
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.shared_vref = true,
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.channel[0] = AD5064_CHANNEL(0, 16),
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.channel[1] = AD5064_CHANNEL(1, 16),
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.channel[2] = AD5064_CHANNEL(2, 16),
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.channel[3] = AD5064_CHANNEL(3, 16),
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},
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};
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static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
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unsigned int addr, unsigned int val, unsigned int shift)
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{
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val <<= shift;
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st->data = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val);
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return spi_write(st->spi, &st->data, sizeof(st->data));
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}
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static int ad5064_sync_powerdown_mode(struct ad5064_state *st,
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unsigned int channel)
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{
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unsigned int val;
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int ret;
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val = (0x1 << channel);
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if (st->pwr_down[channel])
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val |= st->pwr_down_mode[channel] << 8;
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ret = ad5064_spi_write(st, AD5064_CMD_POWERDOWN_DAC, 0, val, 0);
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return ret;
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}
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static const char ad5064_powerdown_modes[][15] = {
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[AD5064_LDAC_PWRDN_NONE] = "",
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[AD5064_LDAC_PWRDN_1K] = "1kohm_to_gnd",
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[AD5064_LDAC_PWRDN_100K] = "100kohm_to_gnd",
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[AD5064_LDAC_PWRDN_3STATE] = "three_state",
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};
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static ssize_t ad5064_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_attr *this_attr = to_iio_dev_attr(attr);
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5064_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%s\n",
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ad5064_powerdown_modes[st->pwr_down_mode[this_attr->address]]);
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}
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static ssize_t ad5064_write_powerdown_mode(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t len)
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{
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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struct ad5064_state *st = iio_priv(indio_dev);
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unsigned int mode, i;
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int ret;
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mode = 0;
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for (i = 1; i < ARRAY_SIZE(ad5064_powerdown_modes); ++i) {
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if (sysfs_streq(buf, ad5064_powerdown_modes[i])) {
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mode = i;
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break;
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}
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}
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if (mode == 0)
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return -EINVAL;
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mutex_lock(&indio_dev->mlock);
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st->pwr_down_mode[this_attr->address] = mode;
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ret = ad5064_sync_powerdown_mode(st, this_attr->address);
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mutex_unlock(&indio_dev->mlock);
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return ret ? ret : len;
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}
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static ssize_t ad5064_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 ad5064_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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return sprintf(buf, "%d\n", st->pwr_down[this_attr->address]);
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}
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static ssize_t ad5064_write_dac_powerdown(struct device *dev,
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struct device_attribute *attr, 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 ad5064_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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bool pwr_down;
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int ret;
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ret = strtobool(buf, &pwr_down);
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if (ret)
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return ret;
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mutex_lock(&indio_dev->mlock);
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st->pwr_down[this_attr->address] = pwr_down;
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ret = ad5064_sync_powerdown_mode(st, this_attr->address);
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mutex_unlock(&indio_dev->mlock);
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return ret ? ret : len;
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}
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static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
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"1kohm_to_gnd 100kohm_to_gnd three_state");
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#define IIO_DEV_ATTR_DAC_POWERDOWN_MODE(_chan) \
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IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown_mode, \
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S_IRUGO | S_IWUSR, \
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ad5064_read_powerdown_mode, \
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ad5064_write_powerdown_mode, _chan);
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#define IIO_DEV_ATTR_DAC_POWERDOWN(_chan) \
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IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown, \
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S_IRUGO | S_IWUSR, \
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ad5064_read_dac_powerdown, \
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ad5064_write_dac_powerdown, _chan)
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static IIO_DEV_ATTR_DAC_POWERDOWN(0);
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static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(0);
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static IIO_DEV_ATTR_DAC_POWERDOWN(1);
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static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(1);
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static IIO_DEV_ATTR_DAC_POWERDOWN(2);
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static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(2);
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static IIO_DEV_ATTR_DAC_POWERDOWN(3);
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static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(3);
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static struct attribute *ad5064_attributes[] = {
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&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
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&iio_dev_attr_out_voltage1_powerdown.dev_attr.attr,
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&iio_dev_attr_out_voltage2_powerdown.dev_attr.attr,
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&iio_dev_attr_out_voltage3_powerdown.dev_attr.attr,
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&iio_dev_attr_out_voltage0_powerdown_mode.dev_attr.attr,
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&iio_dev_attr_out_voltage1_powerdown_mode.dev_attr.attr,
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&iio_dev_attr_out_voltage2_powerdown_mode.dev_attr.attr,
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&iio_dev_attr_out_voltage3_powerdown_mode.dev_attr.attr,
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&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ad5064_attribute_group = {
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.attrs = ad5064_attributes,
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};
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static int ad5064_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 ad5064_state *st = iio_priv(indio_dev);
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unsigned long scale_uv;
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unsigned int vref;
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switch (m) {
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case 0:
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*val = st->dac_cache[chan->channel];
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return IIO_VAL_INT;
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case (1 << IIO_CHAN_INFO_SCALE_SEPARATE):
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vref = st->chip_info->shared_vref ? 0 : chan->channel;
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scale_uv = regulator_get_voltage(st->vref_reg[vref].consumer);
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if (scale_uv < 0)
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return scale_uv;
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scale_uv = (scale_uv * 100) >> chan->scan_type.realbits;
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*val = scale_uv / 100000;
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*val2 = (scale_uv % 100000) * 10;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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break;
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}
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return -EINVAL;
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}
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static int ad5064_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val, int val2, long mask)
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{
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struct ad5064_state *st = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case 0:
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if (val > (1 << chan->scan_type.realbits) || val < 0)
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return -EINVAL;
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mutex_lock(&indio_dev->mlock);
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ret = ad5064_spi_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N,
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chan->address, val, chan->scan_type.shift);
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|
if (ret == 0)
|
||||||
|
st->dac_cache[chan->channel] = val;
|
||||||
|
mutex_unlock(&indio_dev->mlock);
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
ret = -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct iio_info ad5064_info = {
|
||||||
|
.read_raw = ad5064_read_raw,
|
||||||
|
.write_raw = ad5064_write_raw,
|
||||||
|
.attrs = &ad5064_attribute_group,
|
||||||
|
.driver_module = THIS_MODULE,
|
||||||
|
};
|
||||||
|
|
||||||
|
static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
|
||||||
|
{
|
||||||
|
return st->chip_info->shared_vref ? 1 : AD5064_DAC_CHANNELS;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const char * const ad5064_vref_names[] = {
|
||||||
|
"vrefA",
|
||||||
|
"vrefB",
|
||||||
|
"vrefC",
|
||||||
|
"vrefD",
|
||||||
|
};
|
||||||
|
|
||||||
|
static const char * const ad5064_vref_name(struct ad5064_state *st,
|
||||||
|
unsigned int vref)
|
||||||
|
{
|
||||||
|
return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref];
|
||||||
|
}
|
||||||
|
|
||||||
|
static int __devinit ad5064_probe(struct spi_device *spi)
|
||||||
|
{
|
||||||
|
enum ad5064_type type = spi_get_device_id(spi)->driver_data;
|
||||||
|
struct iio_dev *indio_dev;
|
||||||
|
struct ad5064_state *st;
|
||||||
|
unsigned int i;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
indio_dev = iio_allocate_device(sizeof(*st));
|
||||||
|
if (indio_dev == NULL)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
st = iio_priv(indio_dev);
|
||||||
|
spi_set_drvdata(spi, indio_dev);
|
||||||
|
|
||||||
|
st->chip_info = &ad5064_chip_info_tbl[type];
|
||||||
|
st->spi = spi;
|
||||||
|
|
||||||
|
for (i = 0; i < ad5064_num_vref(st); ++i)
|
||||||
|
st->vref_reg[i].supply = ad5064_vref_name(st, i);
|
||||||
|
|
||||||
|
ret = regulator_bulk_get(&st->spi->dev, ad5064_num_vref(st),
|
||||||
|
st->vref_reg);
|
||||||
|
if (ret)
|
||||||
|
goto error_free;
|
||||||
|
|
||||||
|
ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);
|
||||||
|
if (ret)
|
||||||
|
goto error_free_reg;
|
||||||
|
|
||||||
|
for (i = 0; i < AD5064_DAC_CHANNELS; ++i) {
|
||||||
|
st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
|
||||||
|
st->dac_cache[i] = 0x8000;
|
||||||
|
}
|
||||||
|
|
||||||
|
indio_dev->dev.parent = &spi->dev;
|
||||||
|
indio_dev->name = spi_get_device_id(spi)->name;
|
||||||
|
indio_dev->info = &ad5064_info;
|
||||||
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||||
|
indio_dev->channels = st->chip_info->channel;
|
||||||
|
indio_dev->num_channels = AD5064_DAC_CHANNELS;
|
||||||
|
|
||||||
|
ret = iio_device_register(indio_dev);
|
||||||
|
if (ret)
|
||||||
|
goto error_disable_reg;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
error_disable_reg:
|
||||||
|
regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
|
||||||
|
error_free_reg:
|
||||||
|
regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
|
||||||
|
error_free:
|
||||||
|
iio_free_device(indio_dev);
|
||||||
|
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
|
||||||
|
static int __devexit ad5064_remove(struct spi_device *spi)
|
||||||
|
{
|
||||||
|
struct iio_dev *indio_dev = spi_get_drvdata(spi);
|
||||||
|
struct ad5064_state *st = iio_priv(indio_dev);
|
||||||
|
|
||||||
|
iio_device_unregister(indio_dev);
|
||||||
|
|
||||||
|
regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
|
||||||
|
regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
|
||||||
|
|
||||||
|
iio_free_device(indio_dev);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct spi_device_id ad5064_id[] = {
|
||||||
|
{"ad5024", ID_AD5024},
|
||||||
|
{"ad5044", ID_AD5044},
|
||||||
|
{"ad5064", ID_AD5064},
|
||||||
|
{"ad5064-1", ID_AD5064_1},
|
||||||
|
{}
|
||||||
|
};
|
||||||
|
MODULE_DEVICE_TABLE(spi, ad5064_id);
|
||||||
|
|
||||||
|
static struct spi_driver ad5064_driver = {
|
||||||
|
.driver = {
|
||||||
|
.name = "ad5064",
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
},
|
||||||
|
.probe = ad5064_probe,
|
||||||
|
.remove = __devexit_p(ad5064_remove),
|
||||||
|
.id_table = ad5064_id,
|
||||||
|
};
|
||||||
|
|
||||||
|
static __init int ad5064_spi_init(void)
|
||||||
|
{
|
||||||
|
return spi_register_driver(&ad5064_driver);
|
||||||
|
}
|
||||||
|
module_init(ad5064_spi_init);
|
||||||
|
|
||||||
|
static __exit void ad5064_spi_exit(void)
|
||||||
|
{
|
||||||
|
spi_unregister_driver(&ad5064_driver);
|
||||||
|
}
|
||||||
|
module_exit(ad5064_spi_exit);
|
||||||
|
|
||||||
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
||||||
|
MODULE_DESCRIPTION("Analog Devices AD5064/64-1/44/24 DAC");
|
||||||
|
MODULE_LICENSE("GPL v2");
|
||||||
Loading…
Reference in New Issue