--- /dev/null
+/*
+ * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver
+ *
+ * Copyright 2010-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/regulator/consumer.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "ad5624r.h"
+
+static int ad5624r_spi_write(struct spi_device *spi,
+ u8 cmd, u8 addr, u16 val, u8 len)
+{
+ u32 data;
+ u8 msg[3];
+
+ /*
+ * The input shift register is 24 bits wide. The first two bits are
+ * don't care bits. The next three are the command bits, C2 to C0,
+ * followed by the 3-bit DAC address, A2 to A0, and then the
+ * 16-, 14-, 12-bit data-word. The data-word comprises the 16-,
+ * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,
+ * for the AD5664R, AD5644R, and AD5624R, respectively.
+ */
+ data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << (16 - len));
+ msg[0] = data >> 16;
+ msg[1] = data >> 8;
+ msg[2] = data;
+
+ return spi_write(spi, msg, 3);
+}
+
+static int ad5624r_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ struct ad5624r_state *st = iio_priv(indio_dev);
+
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ *val = st->vref_mv;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
+ }
+ return -EINVAL;
+}
+
+static int ad5624r_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val,
+ int val2,
+ long mask)
+{
+ struct ad5624r_state *st = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ if (val >= (1 << chan->scan_type.realbits) || val < 0)
+ return -EINVAL;
+
+ return ad5624r_spi_write(st->us,
+ AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,
+ chan->address, val,
+ chan->scan_type.shift);
+ default:
+ return -EINVAL;
+ }
+}
+
+static const char * const ad5624r_powerdown_modes[] = {
+ "1kohm_to_gnd",
+ "100kohm_to_gnd",
+ "three_state"
+};
+
+static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan)
+{
+ struct ad5624r_state *st = iio_priv(indio_dev);
+
+ return st->pwr_down_mode;
+}
+
+static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, unsigned int mode)
+{
+ struct ad5624r_state *st = iio_priv(indio_dev);
+
+ st->pwr_down_mode = mode;
+
+ return 0;
+}
+
+static const struct iio_enum ad5624r_powerdown_mode_enum = {
+ .items = ad5624r_powerdown_modes,
+ .num_items = ARRAY_SIZE(ad5624r_powerdown_modes),
+ .get = ad5624r_get_powerdown_mode,
+ .set = ad5624r_set_powerdown_mode,
+};
+
+static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev,
+ uintptr_t private, const struct iio_chan_spec *chan, char *buf)
+{
+ struct ad5624r_state *st = iio_priv(indio_dev);
+
+ return sprintf(buf, "%d\n",
+ !!(st->pwr_down_mask & (1 << chan->channel)));
+}
+
+static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev,
+ uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
+ size_t len)
+{
+ bool pwr_down;
+ int ret;
+ struct ad5624r_state *st = iio_priv(indio_dev);
+
+ ret = strtobool(buf, &pwr_down);
+ if (ret)
+ return ret;
+
+ if (pwr_down)
+ st->pwr_down_mask |= (1 << chan->channel);
+ else
+ st->pwr_down_mask &= ~(1 << chan->channel);
+
+ ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,
+ (st->pwr_down_mode << 4) |
+ st->pwr_down_mask, 16);
+
+ return ret ? ret : len;
+}
+
+static const struct iio_info ad5624r_info = {
+ .write_raw = ad5624r_write_raw,
+ .read_raw = ad5624r_read_raw,
+ .driver_module = THIS_MODULE,
+};
+
+static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = {
+ {
+ .name = "powerdown",
+ .read = ad5624r_read_dac_powerdown,
+ .write = ad5624r_write_dac_powerdown,
+ .shared = IIO_SEPARATE,
+ },
+ IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
+ &ad5624r_powerdown_mode_enum),
+ IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum),
+ { },
+};
+
+#define AD5624R_CHANNEL(_chan, _bits) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .output = 1, \
+ .channel = (_chan), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .address = (_chan), \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = (_bits), \
+ .storagebits = 16, \
+ .shift = 16 - (_bits), \
+ }, \
+ .ext_info = ad5624r_ext_info, \
+}
+
+#define DECLARE_AD5624R_CHANNELS(_name, _bits) \
+ const struct iio_chan_spec _name##_channels[] = { \
+ AD5624R_CHANNEL(0, _bits), \
+ AD5624R_CHANNEL(1, _bits), \
+ AD5624R_CHANNEL(2, _bits), \
+ AD5624R_CHANNEL(3, _bits), \
+}
+
+static DECLARE_AD5624R_CHANNELS(ad5624r, 12);
+static DECLARE_AD5624R_CHANNELS(ad5644r, 14);
+static DECLARE_AD5624R_CHANNELS(ad5664r, 16);
+
+static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {
+ [ID_AD5624R3] = {
+ .channels = ad5624r_channels,
+ .int_vref_mv = 1250,
+ },
+ [ID_AD5624R5] = {
+ .channels = ad5624r_channels,
+ .int_vref_mv = 2500,
+ },
+ [ID_AD5644R3] = {
+ .channels = ad5644r_channels,
+ .int_vref_mv = 1250,
+ },
+ [ID_AD5644R5] = {
+ .channels = ad5644r_channels,
+ .int_vref_mv = 2500,
+ },
+ [ID_AD5664R3] = {
+ .channels = ad5664r_channels,
+ .int_vref_mv = 1250,
+ },
+ [ID_AD5664R5] = {
+ .channels = ad5664r_channels,
+ .int_vref_mv = 2500,
+ },
+};
+
+static int ad5624r_probe(struct spi_device *spi)
+{
+ struct ad5624r_state *st;
+ struct iio_dev *indio_dev;
+ int ret, voltage_uv = 0;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+ st = iio_priv(indio_dev);
+ st->reg = devm_regulator_get(&spi->dev, "vcc");
+ if (!IS_ERR(st->reg)) {
+ ret = regulator_enable(st->reg);
+ if (ret)
+ return ret;
+
+ ret = regulator_get_voltage(st->reg);
+ if (ret < 0)
+ goto error_disable_reg;
+
+ voltage_uv = ret;
+ }
+
+ spi_set_drvdata(spi, indio_dev);
+ st->chip_info =
+ &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];
+
+ if (voltage_uv)
+ st->vref_mv = voltage_uv / 1000;
+ else
+ st->vref_mv = st->chip_info->int_vref_mv;
+
+ st->us = spi;
+
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->name = spi_get_device_id(spi)->name;
+ indio_dev->info = &ad5624r_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = st->chip_info->channels;
+ indio_dev->num_channels = AD5624R_DAC_CHANNELS;
+
+ ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,
+ !!voltage_uv, 16);
+ if (ret)
+ goto error_disable_reg;
+
+ ret = iio_device_register(indio_dev);
+ if (ret)
+ goto error_disable_reg;
+
+ return 0;
+
+error_disable_reg:
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+
+ return ret;
+}
+
+static int ad5624r_remove(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev = spi_get_drvdata(spi);
+ struct ad5624r_state *st = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+
+ return 0;
+}
+
+static const struct spi_device_id ad5624r_id[] = {
+ {"ad5624r3", ID_AD5624R3},
+ {"ad5644r3", ID_AD5644R3},
+ {"ad5664r3", ID_AD5664R3},
+ {"ad5624r5", ID_AD5624R5},
+ {"ad5644r5", ID_AD5644R5},
+ {"ad5664r5", ID_AD5664R5},
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad5624r_id);
+
+static struct spi_driver ad5624r_driver = {
+ .driver = {
+ .name = "ad5624r",
+ .owner = THIS_MODULE,
+ },
+ .probe = ad5624r_probe,
+ .remove = ad5624r_remove,
+ .id_table = ad5624r_id,
+};
+module_spi_driver(ad5624r_driver);
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff