staging: IIO: DAC: New driver for the AD5504 and AD55041 High Voltage DACs
Changes since V1: IIO: DAC: Apply review feedback from Jonathan Fix array size and declare const. Fix reversed dacY_powerdown read back. Use individual attribute groups instead of is_visible. Fix event naming and add the _en file. Changes since V2: IIO: DAC: AD5504 use proper event type 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
Родитель
d6f087ec9c
Коммит
59c23eabda
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@ -21,6 +21,16 @@ config AD5446
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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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config AD5504
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tristate "Analog Devices AD5504/AD5501 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 AD5504, AD5501,
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High Voltage 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 ad5504.
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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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@ -3,5 +3,6 @@
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#
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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_MAX517) += max517.o
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@ -0,0 +1,426 @@
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/*
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* AD5504, AD5501 High Voltage 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 "ad5504.h"
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static int ad5504_spi_write(struct spi_device *spi, u8 addr, u16 val)
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{
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u16 tmp = cpu_to_be16(AD5504_CMD_WRITE |
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AD5504_ADDR(addr) |
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(val & AD5504_RES_MASK));
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return spi_write(spi, (u8 *)&tmp, 2);
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}
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static int ad5504_spi_read(struct spi_device *spi, u8 addr, u16 *val)
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{
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u16 tmp = cpu_to_be16(AD5504_CMD_READ | AD5504_ADDR(addr));
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int ret;
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struct spi_transfer t = {
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.tx_buf = &tmp,
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.rx_buf = val,
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.len = 2,
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};
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struct spi_message m;
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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ret = spi_sync(spi, &m);
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*val = be16_to_cpu(*val) & AD5504_RES_MASK;
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return ret;
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}
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static ssize_t ad5504_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 ad5504_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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ret = ad5504_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 ad5504_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 ad5504_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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u16 val;
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ret = ad5504_spi_read(st->spi, this_attr->address, &val);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", val);
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}
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static ssize_t ad5504_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 ad5504_state *st = iio_dev_get_devdata(indio_dev);
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const char mode[][14] = {"20kohm_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 ad5504_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 ad5504_state *st = iio_dev_get_devdata(indio_dev);
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int ret;
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if (sysfs_streq(buf, "20kohm_to_gnd"))
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st->pwr_down_mode = AD5504_DAC_PWRDN_20K;
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else if (sysfs_streq(buf, "three_state"))
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st->pwr_down_mode = AD5504_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 ad5504_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 ad5504_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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return sprintf(buf, "%d\n",
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!(st->pwr_down_mask & (1 << this_attr->address)));
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}
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static ssize_t ad5504_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 ad5504_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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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_mask |= (1 << this_attr->address);
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else if (readin == 1)
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st->pwr_down_mask &= ~(1 << this_attr->address);
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else
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ret = -EINVAL;
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ret = ad5504_spi_write(st->spi, AD5504_ADDR_CTRL,
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AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |
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AD5504_DAC_PWR(st->pwr_down_mask));
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/* writes to the CTRL register must be followed by a NOOP */
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ad5504_spi_write(st->spi, AD5504_ADDR_NOOP, 0);
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return ret ? ret : len;
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}
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static ssize_t ad5504_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 ad5504_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) >> AD5505_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, ad5504_show_scale, NULL, 0);
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static ssize_t ad5504_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 ad5504_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, ad5504_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, ad5504_read_dac,
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ad5504_write_dac, AD5504_ADDR_DAC0);
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static IIO_DEV_ATTR_OUT_RW_RAW(1, ad5504_read_dac,
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ad5504_write_dac, AD5504_ADDR_DAC1);
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static IIO_DEV_ATTR_OUT_RW_RAW(2, ad5504_read_dac,
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ad5504_write_dac, AD5504_ADDR_DAC2);
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static IIO_DEV_ATTR_OUT_RW_RAW(3, ad5504_read_dac,
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ad5504_write_dac, AD5504_ADDR_DAC3);
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static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO |
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S_IWUSR, ad5504_read_powerdown_mode,
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ad5504_write_powerdown_mode, 0);
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static IIO_CONST_ATTR(out_powerdown_mode_available,
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"20kohm_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, ad5504_read_dac_powerdown,
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ad5504_write_dac_powerdown, 0);
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static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5504_read_dac_powerdown,
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ad5504_write_dac_powerdown, 1);
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static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5504_read_dac_powerdown,
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ad5504_write_dac_powerdown, 2);
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static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5504_read_dac_powerdown,
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ad5504_write_dac_powerdown, 3);
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static struct attribute *ad5504_attributes[] = {
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&iio_dev_attr_out0_raw.dev_attr.attr,
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&iio_dev_attr_out1_raw.dev_attr.attr,
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&iio_dev_attr_out2_raw.dev_attr.attr,
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&iio_dev_attr_out3_raw.dev_attr.attr,
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&iio_dev_attr_out0_powerdown.dev_attr.attr,
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&iio_dev_attr_out1_powerdown.dev_attr.attr,
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&iio_dev_attr_out2_powerdown.dev_attr.attr,
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&iio_dev_attr_out3_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 ad5504_attribute_group = {
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.attrs = ad5504_attributes,
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};
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static struct attribute *ad5501_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 ad5501_attribute_group = {
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.attrs = ad5501_attributes,
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};
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static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
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static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
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static struct attribute *ad5504_ev_attributes[] = {
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&iio_const_attr_temp0_thresh_rising_value.dev_attr.attr,
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&iio_const_attr_temp0_thresh_rising_en.dev_attr.attr,
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NULL,
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};
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static struct attribute_group ad5504_ev_attribute_group = {
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.attrs = ad5504_ev_attributes,
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};
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static void ad5504_interrupt_bh(struct work_struct *work_s)
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{
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struct ad5504_state *st = container_of(work_s,
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struct ad5504_state, work_alarm);
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iio_push_event(st->indio_dev, 0,
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IIO_UNMOD_EVENT_CODE(IIO_EV_CLASS_TEMP,
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0,
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||||
IIO_EV_TYPE_THRESH,
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||||
IIO_EV_DIR_RISING),
|
||||
st->last_timestamp);
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||||
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enable_irq(st->spi->irq);
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||||
}
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||||
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static int ad5504_interrupt(struct iio_dev *dev_info,
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int index,
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s64 timestamp,
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||||
int no_test)
|
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{
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||||
struct ad5504_state *st = dev_info->dev_data;
|
||||
|
||||
st->last_timestamp = timestamp;
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schedule_work(&st->work_alarm);
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||||
return 0;
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||||
}
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||||
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||||
IIO_EVENT_SH(ad5504, &ad5504_interrupt);
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|
||||
static int __devinit ad5504_probe(struct spi_device *spi)
|
||||
{
|
||||
struct ad5504_platform_data *pdata = spi->dev.platform_data;
|
||||
struct ad5504_state *st;
|
||||
int ret, voltage_uv = 0;
|
||||
|
||||
st = kzalloc(sizeof(*st), GFP_KERNEL);
|
||||
if (st == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto error_ret;
|
||||
}
|
||||
|
||||
spi_set_drvdata(spi, st);
|
||||
|
||||
st->reg = regulator_get(&spi->dev, "vcc");
|
||||
if (!IS_ERR(st->reg)) {
|
||||
ret = regulator_enable(st->reg);
|
||||
if (ret)
|
||||
goto error_put_reg;
|
||||
|
||||
voltage_uv = regulator_get_voltage(st->reg);
|
||||
}
|
||||
|
||||
if (voltage_uv)
|
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st->vref_mv = voltage_uv / 1000;
|
||||
else if (pdata)
|
||||
st->vref_mv = pdata->vref_mv;
|
||||
else
|
||||
dev_warn(&spi->dev, "reference voltage unspecified\n");
|
||||
|
||||
st->spi = spi;
|
||||
st->indio_dev = iio_allocate_device();
|
||||
if (st->indio_dev == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto error_disable_reg;
|
||||
}
|
||||
st->indio_dev->dev.parent = &spi->dev;
|
||||
|
||||
st->indio_dev->attrs = spi_get_device_id(st->spi)->driver_data
|
||||
== ID_AD5501 ? &ad5501_attribute_group :
|
||||
&ad5504_attribute_group;
|
||||
st->indio_dev->dev_data = (void *)(st);
|
||||
st->indio_dev->driver_module = THIS_MODULE;
|
||||
st->indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
st->indio_dev->num_interrupt_lines = 1;
|
||||
st->indio_dev->event_attrs = &ad5504_ev_attribute_group,
|
||||
|
||||
ret = iio_device_register(st->indio_dev);
|
||||
if (ret)
|
||||
goto error_free_dev;
|
||||
|
||||
if (spi->irq) {
|
||||
INIT_WORK(&st->work_alarm, ad5504_interrupt_bh);
|
||||
|
||||
ret = iio_register_interrupt_line(spi->irq,
|
||||
st->indio_dev,
|
||||
0,
|
||||
IRQF_TRIGGER_FALLING,
|
||||
spi_get_device_id(st->spi)->name);
|
||||
if (ret)
|
||||
goto error_unreg_iio_device;
|
||||
|
||||
iio_add_event_to_list(&iio_event_ad5504,
|
||||
&st->indio_dev->interrupts[0]->ev_list);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
error_unreg_iio_device:
|
||||
iio_device_unregister(st->indio_dev);
|
||||
error_free_dev:
|
||||
iio_free_device(st->indio_dev);
|
||||
error_disable_reg:
|
||||
if (!IS_ERR(st->reg))
|
||||
regulator_disable(st->reg);
|
||||
error_put_reg:
|
||||
if (!IS_ERR(st->reg))
|
||||
regulator_put(st->reg);
|
||||
|
||||
kfree(st);
|
||||
error_ret:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit ad5504_remove(struct spi_device *spi)
|
||||
{
|
||||
struct ad5504_state *st = spi_get_drvdata(spi);
|
||||
|
||||
if (spi->irq)
|
||||
iio_unregister_interrupt_line(st->indio_dev, 0);
|
||||
|
||||
iio_device_unregister(st->indio_dev);
|
||||
|
||||
if (!IS_ERR(st->reg)) {
|
||||
regulator_disable(st->reg);
|
||||
regulator_put(st->reg);
|
||||
}
|
||||
|
||||
kfree(st);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct spi_device_id ad5504_id[] = {
|
||||
{"ad5504", ID_AD5504},
|
||||
{"ad5501", ID_AD5501},
|
||||
{}
|
||||
};
|
||||
|
||||
static struct spi_driver ad5504_driver = {
|
||||
.driver = {
|
||||
.name = "ad5504",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = ad5504_probe,
|
||||
.remove = __devexit_p(ad5504_remove),
|
||||
.id_table = ad5504_id,
|
||||
};
|
||||
|
||||
static __init int ad5504_spi_init(void)
|
||||
{
|
||||
return spi_register_driver(&ad5504_driver);
|
||||
}
|
||||
module_init(ad5504_spi_init);
|
||||
|
||||
static __exit void ad5504_spi_exit(void)
|
||||
{
|
||||
spi_unregister_driver(&ad5504_driver);
|
||||
}
|
||||
module_exit(ad5504_spi_exit);
|
||||
|
||||
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,74 @@
|
|||
/*
|
||||
* AD5504 SPI DAC driver
|
||||
*
|
||||
* Copyright 2011 Analog Devices Inc.
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#ifndef SPI_AD5504_H_
|
||||
#define SPI_AD5504_H_
|
||||
|
||||
#define AD5505_BITS 12
|
||||
#define AD5504_RES_MASK ((1 << (AD5505_BITS)) - 1)
|
||||
|
||||
#define AD5504_CMD_READ (1 << 15)
|
||||
#define AD5504_CMD_WRITE (0 << 15)
|
||||
#define AD5504_ADDR(addr) ((addr) << 12)
|
||||
|
||||
/* Registers */
|
||||
#define AD5504_ADDR_NOOP 0
|
||||
#define AD5504_ADDR_DAC0 1
|
||||
#define AD5504_ADDR_DAC1 2
|
||||
#define AD5504_ADDR_DAC2 3
|
||||
#define AD5504_ADDR_DAC3 4
|
||||
#define AD5504_ADDR_ALL_DAC 5
|
||||
#define AD5504_ADDR_CTRL 7
|
||||
|
||||
/* Control Register */
|
||||
#define AD5504_DAC_PWR(ch) ((ch) << 2)
|
||||
#define AD5504_DAC_PWRDWN_MODE(mode) ((mode) << 6)
|
||||
#define AD5504_DAC_PWRDN_20K 0
|
||||
#define AD5504_DAC_PWRDN_3STATE 1
|
||||
|
||||
/*
|
||||
* TODO: struct ad5504_platform_data needs to go into include/linux/iio
|
||||
*/
|
||||
|
||||
struct ad5504_platform_data {
|
||||
u16 vref_mv;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ad5446_state - driver instance specific data
|
||||
* @indio_dev: the industrial I/O device
|
||||
* @us: spi_device
|
||||
* @reg: supply regulator
|
||||
* @vref_mv: actual reference voltage used
|
||||
* @work_alarm: bh work structure for event handling
|
||||
* @last_timestamp: timestamp of last event interrupt
|
||||
* @pwr_down_mask power down mask
|
||||
* @pwr_down_mode current power down mode
|
||||
*/
|
||||
|
||||
struct ad5504_state {
|
||||
struct iio_dev *indio_dev;
|
||||
struct spi_device *spi;
|
||||
struct regulator *reg;
|
||||
unsigned short vref_mv;
|
||||
struct work_struct work_alarm;
|
||||
s64 last_timestamp;
|
||||
unsigned pwr_down_mask;
|
||||
unsigned pwr_down_mode;
|
||||
};
|
||||
|
||||
/**
|
||||
* ad5504_supported_device_ids:
|
||||
*/
|
||||
|
||||
enum ad5504_supported_device_ids {
|
||||
ID_AD5504,
|
||||
ID_AD5501,
|
||||
};
|
||||
|
||||
#endif /* SPI_AD5504_H_ */
|
||||
|
|
@ -266,6 +266,7 @@ struct iio_const_attr {
|
|||
#define IIO_EV_CLASS_MAGN 4
|
||||
#define IIO_EV_CLASS_LIGHT 5
|
||||
#define IIO_EV_CLASS_PROXIMITY 6
|
||||
#define IIO_EV_CLASS_TEMP 7
|
||||
|
||||
#define IIO_EV_MOD_X 0
|
||||
#define IIO_EV_MOD_Y 1
|
||||
|
|
|
|||
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