398 lines
10 KiB
C
398 lines
10 KiB
C
/*
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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 <linux/module.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_priv(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_priv(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_priv(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_priv(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_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",
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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_priv(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_priv(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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#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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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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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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.name = "events",
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};
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static irqreturn_t ad5504_event_handler(int irq, void *private)
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{
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iio_push_event(private,
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IIO_UNMOD_EVENT_CODE(IIO_TEMP,
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0,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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iio_get_time_ns());
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return IRQ_HANDLED;
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}
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static const struct iio_info ad5504_info = {
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.attrs = &ad5504_attribute_group,
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.event_attrs = &ad5504_ev_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static const struct iio_info ad5501_info = {
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.attrs = &ad5501_attribute_group,
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.event_attrs = &ad5504_ev_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int __devinit ad5504_probe(struct spi_device *spi)
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{
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struct ad5504_platform_data *pdata = spi->dev.platform_data;
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struct iio_dev *indio_dev;
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struct ad5504_state *st;
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struct regulator *reg;
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int ret, voltage_uv = 0;
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reg = regulator_get(&spi->dev, "vcc");
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if (!IS_ERR(reg)) {
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ret = regulator_enable(reg);
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if (ret)
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goto error_put_reg;
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voltage_uv = regulator_get_voltage(reg);
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}
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indio_dev = iio_allocate_device(sizeof(*st));
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if (indio_dev == NULL) {
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ret = -ENOMEM;
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goto error_disable_reg;
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}
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spi_set_drvdata(spi, indio_dev);
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st = iio_priv(indio_dev);
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if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else if (pdata)
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st->vref_mv = pdata->vref_mv;
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else
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dev_warn(&spi->dev, "reference voltage unspecified\n");
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st->reg = reg;
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st->spi = spi;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->name = spi_get_device_id(st->spi)->name;
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if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
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indio_dev->info = &ad5501_info;
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else
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indio_dev->info = &ad5504_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_free_dev;
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if (spi->irq) {
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ret = request_threaded_irq(spi->irq,
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NULL,
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&ad5504_event_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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spi_get_device_id(st->spi)->name,
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indio_dev);
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if (ret)
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goto error_unreg_iio_device;
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}
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return 0;
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error_unreg_iio_device:
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iio_device_unregister(indio_dev);
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error_free_dev:
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iio_free_device(indio_dev);
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error_disable_reg:
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if (!IS_ERR(reg))
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regulator_disable(reg);
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error_put_reg:
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if (!IS_ERR(reg))
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regulator_put(reg);
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return ret;
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}
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static int __devexit ad5504_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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struct ad5504_state *st = iio_priv(indio_dev);
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struct regulator *reg = st->reg;
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if (spi->irq)
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free_irq(spi->irq, indio_dev);
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iio_device_unregister(indio_dev);
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if (!IS_ERR(reg)) {
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regulator_disable(reg);
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regulator_put(reg);
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}
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return 0;
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}
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static const struct spi_device_id ad5504_id[] = {
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{"ad5504", ID_AD5504},
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{"ad5501", ID_AD5501},
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{}
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};
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static struct spi_driver ad5504_driver = {
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.driver = {
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.name = "ad5504",
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.owner = THIS_MODULE,
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},
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.probe = ad5504_probe,
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.remove = __devexit_p(ad5504_remove),
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.id_table = ad5504_id,
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};
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static __init int ad5504_spi_init(void)
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{
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return spi_register_driver(&ad5504_driver);
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}
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module_init(ad5504_spi_init);
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static __exit void ad5504_spi_exit(void)
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{
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spi_unregister_driver(&ad5504_driver);
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}
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module_exit(ad5504_spi_exit);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Analog Devices AD5501/AD5501 DAC");
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MODULE_LICENSE("GPL v2");
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