338 lines
8.7 KiB
C
338 lines
8.7 KiB
C
/*
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* AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
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*
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* Copyright 2010-2011 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 "ad5624r.h"
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static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
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[ID_AD5624R3] = {
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.bits = 12,
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.int_vref_mv = 1250,
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},
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[ID_AD5644R3] = {
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.bits = 14,
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.int_vref_mv = 1250,
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},
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[ID_AD5664R3] = {
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.bits = 16,
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.int_vref_mv = 1250,
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},
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[ID_AD5624R5] = {
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.bits = 12,
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.int_vref_mv = 2500,
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},
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[ID_AD5644R5] = {
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.bits = 14,
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.int_vref_mv = 2500,
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},
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[ID_AD5664R5] = {
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.bits = 16,
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.int_vref_mv = 2500,
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},
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};
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static int ad5624r_spi_write(struct spi_device *spi,
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u8 cmd, u8 addr, u16 val, u8 len)
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{
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u32 data;
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u8 msg[3];
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/*
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* The input shift register is 24 bits wide. The first two bits are
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* don't care bits. The next three are the command bits, C2 to C0,
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* followed by the 3-bit DAC address, A2 to A0, and then the
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* 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
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* 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
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* for the AD5664R, AD5644R, and AD5624R, respectively.
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*/
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data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
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msg[0] = data >> 16;
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msg[1] = data >> 8;
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msg[2] = data;
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return spi_write(spi, msg, 3);
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}
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static ssize_t ad5624r_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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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 ad5624r_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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ret = ad5624r_spi_write(st->us, AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
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this_attr->address, readin,
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st->chip_info->bits);
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return ret ? ret : len;
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}
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static ssize_t ad5624r_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 ad5624r_state *st = iio_priv(indio_dev);
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char mode[][15] = {"", "1kohm_to_gnd", "100kohm_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 ad5624r_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 ad5624r_state *st = iio_priv(indio_dev);
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int ret;
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if (sysfs_streq(buf, "1kohm_to_gnd"))
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st->pwr_down_mode = AD5624R_LDAC_PWRDN_1K;
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else if (sysfs_streq(buf, "100kohm_to_gnd"))
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st->pwr_down_mode = AD5624R_LDAC_PWRDN_100K;
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else if (sysfs_streq(buf, "three_state"))
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st->pwr_down_mode = AD5624R_LDAC_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 ad5624r_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 ad5624r_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 ad5624r_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 ad5624r_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 == 1)
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st->pwr_down_mask |= (1 << this_attr->address);
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else if (!readin)
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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 = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
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(st->pwr_down_mode << 4) |
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st->pwr_down_mask, 16);
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return ret ? ret : len;
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}
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static ssize_t ad5624r_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 ad5624r_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) >> 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, ad5624r_show_scale, NULL, 0);
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static IIO_DEV_ATTR_OUT_RAW(0, ad5624r_write_dac, AD5624R_ADDR_DAC0);
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static IIO_DEV_ATTR_OUT_RAW(1, ad5624r_write_dac, AD5624R_ADDR_DAC1);
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static IIO_DEV_ATTR_OUT_RAW(2, ad5624r_write_dac, AD5624R_ADDR_DAC2);
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static IIO_DEV_ATTR_OUT_RAW(3, ad5624r_write_dac, AD5624R_ADDR_DAC3);
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static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO |
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S_IWUSR, ad5624r_read_powerdown_mode,
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ad5624r_write_powerdown_mode, 0);
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static IIO_CONST_ATTR(out_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(_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, ad5624r_read_dac_powerdown,
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ad5624r_write_dac_powerdown, 0);
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static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5624r_read_dac_powerdown,
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ad5624r_write_dac_powerdown, 1);
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static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5624r_read_dac_powerdown,
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ad5624r_write_dac_powerdown, 2);
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static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5624r_read_dac_powerdown,
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ad5624r_write_dac_powerdown, 3);
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static struct attribute *ad5624r_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 ad5624r_attribute_group = {
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.attrs = ad5624r_attributes,
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};
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static const struct iio_info ad5624r_info = {
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.attrs = &ad5624r_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int __devinit ad5624r_probe(struct spi_device *spi)
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{
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struct ad5624r_state *st;
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struct iio_dev *indio_dev;
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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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st = iio_priv(indio_dev);
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st->reg = reg;
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spi_set_drvdata(spi, indio_dev);
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st->chip_info =
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&ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
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if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else
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st->vref_mv = st->chip_info->int_vref_mv;
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st->us = spi;
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indio_dev->dev.parent = &spi->dev;
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indio_dev->name = spi_get_device_id(spi)->name;
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indio_dev->info = &ad5624r_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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ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
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!!voltage_uv, 16);
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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(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 ad5624r_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 ad5624r_state *st = iio_priv(indio_dev);
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struct regulator *reg = st->reg;
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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 ad5624r_id[] = {
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{"ad5624r3", ID_AD5624R3},
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{"ad5644r3", ID_AD5644R3},
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{"ad5664r3", ID_AD5664R3},
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{"ad5624r5", ID_AD5624R5},
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{"ad5644r5", ID_AD5644R5},
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{"ad5664r5", ID_AD5664R5},
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{}
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};
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static struct spi_driver ad5624r_driver = {
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.driver = {
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.name = "ad5624r",
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.owner = THIS_MODULE,
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},
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.probe = ad5624r_probe,
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.remove = __devexit_p(ad5624r_remove),
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.id_table = ad5624r_id,
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};
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static __init int ad5624r_spi_init(void)
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{
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return spi_register_driver(&ad5624r_driver);
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}
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module_init(ad5624r_spi_init);
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static __exit void ad5624r_spi_exit(void)
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{
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spi_unregister_driver(&ad5624r_driver);
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}
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module_exit(ad5624r_spi_exit);
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
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MODULE_LICENSE("GPL v2");
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