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Diffstat (limited to 'drivers/staging/iio/dac/ad5686.c')
-rw-r--r--drivers/staging/iio/dac/ad5686.c455
1 files changed, 0 insertions, 455 deletions
diff --git a/drivers/staging/iio/dac/ad5686.c b/drivers/staging/iio/dac/ad5686.c
deleted file mode 100644
index c1e903ebc7b9..000000000000
--- a/drivers/staging/iio/dac/ad5686.c
+++ /dev/null
@@ -1,455 +0,0 @@
-/*
- * AD5686R, AD5685R, AD5684R Digital to analog converters driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/interrupt.h>
-#include <linux/fs.h>
-#include <linux/device.h>
-#include <linux/module.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/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include "dac.h"
-
-#define AD5686_DAC_CHANNELS 4
-
-#define AD5686_ADDR(x) ((x) << 16)
-#define AD5686_CMD(x) ((x) << 20)
-
-#define AD5686_ADDR_DAC(chan) (0x1 << (chan))
-#define AD5686_ADDR_ALL_DAC 0xF
-
-#define AD5686_CMD_NOOP 0x0
-#define AD5686_CMD_WRITE_INPUT_N 0x1
-#define AD5686_CMD_UPDATE_DAC_N 0x2
-#define AD5686_CMD_WRITE_INPUT_N_UPDATE_N 0x3
-#define AD5686_CMD_POWERDOWN_DAC 0x4
-#define AD5686_CMD_LDAC_MASK 0x5
-#define AD5686_CMD_RESET 0x6
-#define AD5686_CMD_INTERNAL_REFER_SETUP 0x7
-#define AD5686_CMD_DAISY_CHAIN_ENABLE 0x8
-#define AD5686_CMD_READBACK_ENABLE 0x9
-
-#define AD5686_LDAC_PWRDN_NONE 0x0
-#define AD5686_LDAC_PWRDN_1K 0x1
-#define AD5686_LDAC_PWRDN_100K 0x2
-#define AD5686_LDAC_PWRDN_3STATE 0x3
-
-/**
- * struct ad5686_chip_info - chip specific information
- * @int_vref_mv: AD5620/40/60: the internal reference voltage
- * @channel: channel specification
-*/
-
-struct ad5686_chip_info {
- u16 int_vref_mv;
- struct iio_chan_spec channel[AD5686_DAC_CHANNELS];
-};
-
-/**
- * struct ad5446_state - driver instance specific data
- * @spi: spi_device
- * @chip_info: chip model specific constants, available modes etc
- * @reg: supply regulator
- * @vref_mv: actual reference voltage used
- * @pwr_down_mask: power down mask
- * @pwr_down_mode: current power down mode
- * @data: spi transfer buffers
- */
-
-struct ad5686_state {
- struct spi_device *spi;
- const struct ad5686_chip_info *chip_info;
- struct regulator *reg;
- unsigned short vref_mv;
- unsigned pwr_down_mask;
- unsigned pwr_down_mode;
- /*
- * DMA (thus cache coherency maintenance) requires the
- * transfer buffers to live in their own cache lines.
- */
-
- union {
- u32 d32;
- u8 d8[4];
- } data[3] ____cacheline_aligned;
-};
-
-/**
- * ad5686_supported_device_ids:
- */
-
-enum ad5686_supported_device_ids {
- ID_AD5684,
- ID_AD5685,
- ID_AD5686,
-};
-#define AD5868_CHANNEL(chan, bits, shift) { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .output = 1, \
- .channel = chan, \
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
- IIO_CHAN_INFO_SCALE_SHARED_BIT, \
- .address = AD5686_ADDR_DAC(chan), \
- .scan_type = IIO_ST('u', bits, 16, shift) \
-}
-static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
- [ID_AD5684] = {
- .channel[0] = AD5868_CHANNEL(0, 12, 4),
- .channel[1] = AD5868_CHANNEL(1, 12, 4),
- .channel[2] = AD5868_CHANNEL(2, 12, 4),
- .channel[3] = AD5868_CHANNEL(3, 12, 4),
- .int_vref_mv = 2500,
- },
- [ID_AD5685] = {
- .channel[0] = AD5868_CHANNEL(0, 14, 2),
- .channel[1] = AD5868_CHANNEL(1, 14, 2),
- .channel[2] = AD5868_CHANNEL(2, 14, 2),
- .channel[3] = AD5868_CHANNEL(3, 14, 2),
- .int_vref_mv = 2500,
- },
- [ID_AD5686] = {
- .channel[0] = AD5868_CHANNEL(0, 16, 0),
- .channel[1] = AD5868_CHANNEL(1, 16, 0),
- .channel[2] = AD5868_CHANNEL(2, 16, 0),
- .channel[3] = AD5868_CHANNEL(3, 16, 0),
- .int_vref_mv = 2500,
- },
-};
-
-static int ad5686_spi_write(struct ad5686_state *st,
- u8 cmd, u8 addr, u16 val, u8 shift)
-{
- val <<= shift;
-
- st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
- AD5686_ADDR(addr) |
- val);
-
- return spi_write(st->spi, &st->data[0].d8[1], 3);
-}
-
-static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
-{
- struct spi_transfer t[] = {
- {
- .tx_buf = &st->data[0].d8[1],
- .len = 3,
- .cs_change = 1,
- }, {
- .tx_buf = &st->data[1].d8[1],
- .rx_buf = &st->data[2].d8[1],
- .len = 3,
- },
- };
- struct spi_message m;
- int ret;
-
- spi_message_init(&m);
- spi_message_add_tail(&t[0], &m);
- spi_message_add_tail(&t[1], &m);
-
- st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) |
- AD5686_ADDR(addr));
- st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
-
- ret = spi_sync(st->spi, &m);
- if (ret < 0)
- return ret;
-
- return be32_to_cpu(st->data[2].d32);
-}
-
-static ssize_t ad5686_read_powerdown_mode(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad5686_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
- char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
-
- return sprintf(buf, "%s\n", mode[(st->pwr_down_mode >>
- (this_attr->address * 2)) & 0x3]);
-}
-
-static ssize_t ad5686_write_powerdown_mode(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad5686_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- unsigned mode;
-
- if (sysfs_streq(buf, "1kohm_to_gnd"))
- mode = AD5686_LDAC_PWRDN_1K;
- else if (sysfs_streq(buf, "100kohm_to_gnd"))
- mode = AD5686_LDAC_PWRDN_100K;
- else if (sysfs_streq(buf, "three_state"))
- mode = AD5686_LDAC_PWRDN_3STATE;
- else
- return -EINVAL;
-
- st->pwr_down_mode &= ~(0x3 << (this_attr->address * 2));
- st->pwr_down_mode |= (mode << (this_attr->address * 2));
-
- return len;
-}
-
-static ssize_t ad5686_read_dac_powerdown(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad5686_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
- return sprintf(buf, "%d\n", !!(st->pwr_down_mask &
- (0x3 << (this_attr->address * 2))));
-}
-
-static ssize_t ad5686_write_dac_powerdown(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
-{
- bool readin;
- int ret;
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad5686_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
- ret = strtobool(buf, &readin);
- if (ret)
- return ret;
-
- if (readin == true)
- st->pwr_down_mask |= (0x3 << (this_attr->address * 2));
- else
- st->pwr_down_mask &= ~(0x3 << (this_attr->address * 2));
-
- ret = ad5686_spi_write(st, AD5686_CMD_POWERDOWN_DAC, 0,
- st->pwr_down_mask & st->pwr_down_mode, 0);
-
- return ret ? ret : len;
-}
-
-static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
- "1kohm_to_gnd 100kohm_to_gnd three_state");
-
-#define IIO_DEV_ATTR_DAC_POWERDOWN_MODE(_num) \
- IIO_DEVICE_ATTR(out_voltage##_num##_powerdown_mode, \
- S_IRUGO | S_IWUSR, \
- ad5686_read_powerdown_mode, \
- ad5686_write_powerdown_mode, _num)
-
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(3);
-
-#define IIO_DEV_ATTR_DAC_POWERDOWN(_num) \
- IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \
- S_IRUGO | S_IWUSR, \
- ad5686_read_dac_powerdown, \
- ad5686_write_dac_powerdown, _num)
-
-static IIO_DEV_ATTR_DAC_POWERDOWN(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN(3);
-
-static struct attribute *ad5686_attributes[] = {
- &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage1_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage2_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage3_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage0_powerdown_mode.dev_attr.attr,
- &iio_dev_attr_out_voltage1_powerdown_mode.dev_attr.attr,
- &iio_dev_attr_out_voltage2_powerdown_mode.dev_attr.attr,
- &iio_dev_attr_out_voltage3_powerdown_mode.dev_attr.attr,
- &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad5686_attribute_group = {
- .attrs = ad5686_attributes,
-};
-
-static int ad5686_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- struct ad5686_state *st = iio_priv(indio_dev);
- unsigned long scale_uv;
- int ret;
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- mutex_lock(&indio_dev->mlock);
- ret = ad5686_spi_read(st, chan->address);
- mutex_unlock(&indio_dev->mlock);
- if (ret < 0)
- return ret;
- *val = ret;
- return IIO_VAL_INT;
- break;
- case IIO_CHAN_INFO_SCALE:
- scale_uv = (st->vref_mv * 100000)
- >> (chan->scan_type.realbits);
- *val = scale_uv / 100000;
- *val2 = (scale_uv % 100000) * 10;
- return IIO_VAL_INT_PLUS_MICRO;
-
- }
- return -EINVAL;
-}
-
-static int ad5686_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val,
- int val2,
- long mask)
-{
- struct ad5686_state *st = iio_priv(indio_dev);
- int ret;
-
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- if (val > (1 << chan->scan_type.realbits) || val < 0)
- return -EINVAL;
-
- mutex_lock(&indio_dev->mlock);
- ret = ad5686_spi_write(st,
- AD5686_CMD_WRITE_INPUT_N_UPDATE_N,
- chan->address,
- val,
- chan->scan_type.shift);
- mutex_unlock(&indio_dev->mlock);
- break;
- default:
- ret = -EINVAL;
- }
-
- return ret;
-}
-
-static const struct iio_info ad5686_info = {
- .read_raw = ad5686_read_raw,
- .write_raw = ad5686_write_raw,
- .attrs = &ad5686_attribute_group,
- .driver_module = THIS_MODULE,
-};
-
-static int __devinit ad5686_probe(struct spi_device *spi)
-{
- struct ad5686_state *st;
- struct iio_dev *indio_dev;
- int ret, regdone = 0, voltage_uv = 0;
-
- indio_dev = iio_device_alloc(sizeof(*st));
- if (indio_dev == NULL)
- return -ENOMEM;
-
- st = iio_priv(indio_dev);
- spi_set_drvdata(spi, indio_dev);
-
- 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);
- }
-
- st->chip_info =
- &ad5686_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->spi = spi;
-
- indio_dev->dev.parent = &spi->dev;
- indio_dev->name = spi_get_device_id(spi)->name;
- indio_dev->info = &ad5686_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = st->chip_info->channel;
- indio_dev->num_channels = AD5686_DAC_CHANNELS;
-
- regdone = 1;
- ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0,
- !!voltage_uv, 0);
- 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);
-error_put_reg:
- if (!IS_ERR(st->reg))
- regulator_put(st->reg);
-
- iio_device_free(indio_dev);
-
- return ret;
-}
-
-static int __devexit ad5686_remove(struct spi_device *spi)
-{
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct ad5686_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
- if (!IS_ERR(st->reg)) {
- regulator_disable(st->reg);
- regulator_put(st->reg);
- }
- iio_device_free(indio_dev);
-
- return 0;
-}
-
-static const struct spi_device_id ad5686_id[] = {
- {"ad5684", ID_AD5684},
- {"ad5685", ID_AD5685},
- {"ad5686", ID_AD5686},
- {}
-};
-MODULE_DEVICE_TABLE(spi, ad5686_id);
-
-static struct spi_driver ad5686_driver = {
- .driver = {
- .name = "ad5686",
- .owner = THIS_MODULE,
- },
- .probe = ad5686_probe,
- .remove = __devexit_p(ad5686_remove),
- .id_table = ad5686_id,
-};
-module_spi_driver(ad5686_driver);
-
-MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
-MODULE_DESCRIPTION("Analog Devices AD5686/85/84 DAC");
-MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-13 20:47:10 +0000