Hi Peter,
On Mon, Nov 21, 2011 at 2:23 PM, Lars-Peter Clausen <lars@xxxxxxxxxx> wrote:
>
> This patch adds support for the Analog Devices AD5764, AD5764R, AD5744, AD5744R
> quad channel analog-to-digital converter.
>
> Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
> ---
> drivers/staging/iio/dac/Kconfig | 10 +
> drivers/staging/iio/dac/Makefile | 1 +
> drivers/staging/iio/dac/ad5764.c | 394 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 405 insertions(+), 0 deletions(-)
> create mode 100644 drivers/staging/iio/dac/ad5764.c
>
> diff --git a/drivers/staging/iio/dac/Kconfig b/drivers/staging/iio/dac/Kconfig
> index 0e8a814..bbc33dd 100644
> --- a/drivers/staging/iio/dac/Kconfig
> +++ b/drivers/staging/iio/dac/Kconfig
> @@ -75,6 +75,16 @@ config AD5504
> To compile this driver as a module, choose M here: the
> module will be called ad5504.
>
> +config AD5764
> + tristate "Analog Devices AD5764/64R/44/44R DAC driver"
> + depends on SPI_MASTER
> + help
> + Say yes here to build support for Analog Devices AD5764, AD5764R, AD5744,
> + AD5744R Digital to Analog Converter.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ad5764.
> +
> config AD5791
> tristate "Analog Devices AD5760/AD5780/AD5781/AD5791 DAC SPI driver"
> depends on SPI
> diff --git a/drivers/staging/iio/dac/Makefile b/drivers/staging/iio/dac/Makefile
> index 840e94e..8ab1d26 100644
> --- a/drivers/staging/iio/dac/Makefile
> +++ b/drivers/staging/iio/dac/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
> obj-$(CONFIG_AD5064) += ad5064.o
> obj-$(CONFIG_AD5504) += ad5504.o
> obj-$(CONFIG_AD5446) += ad5446.o
> +obj-$(CONFIG_AD5764) += ad5764.o
> obj-$(CONFIG_AD5791) += ad5791.o
> obj-$(CONFIG_AD5686) += ad5686.o
> obj-$(CONFIG_MAX517) += max517.o
> diff --git a/drivers/staging/iio/dac/ad5764.c b/drivers/staging/iio/dac/ad5764.c
> new file mode 100644
> index 0000000..50c1ec62
> --- /dev/null
> +++ b/drivers/staging/iio/dac/ad5764.c
> @@ -0,0 +1,394 @@
> +/*
> + * Analog devices AD5764, AD5764R, AD5744, AD5744R quad-channel
> + * Digital to Analog Converters driver
> + *
> + * Copyright 2011 Analog Devices Inc.
> + *
> + * Licensed under the GPL-2.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.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 "../iio.h"
> +#include "../sysfs.h"
> +#include "dac.h"
> +
> +#define AD5764_REG_SF_NOP 0x0
> +#define AD5764_REG_SF_CONFIG 0x1
> +#define AD5764_REG_SF_CLEAR 0x4
> +#define AD5764_REG_SF_LOAD 0x5
> +#define AD5764_REG_DATA(x) ((2 << 3) | (x))
> +#define AD5764_REG_COARSE_GAIN(x) ((3 << 3) | (x))
> +#define AD5764_REG_FINE_GAIN(x) ((4 << 3) | (x))
> +#define AD5764_REG_OFFSET(x) ((5 << 3) | (x))
> +
> +#define AD5764_NUM_CHANNELS 4
> +
> +/**
> + * struct ad5764_chip_info - chip specific information
> + * @int_vref: Value of the internal reference voltage in uV - 0 if external
> + * reference voltage is used
> + * @channel channel specification
> +*/
> +
> +struct ad5764_chip_info {
> + unsigned long int_vref;
> + const struct iio_chan_spec *channels;
> +};
> +
> +/**
> + * struct ad5764_state - driver instance specific data
> + * @spi: spi_device
> + * @chip_info: chip info
> + * @vref_reg: vref supply regulators
> + * @data: spi transfer buffers
> + */
> +
> +struct ad5764_state {
> + struct spi_device *spi;
> + const struct ad5764_chip_info *chip_info;
> + struct regulator_bulk_data vref_reg[2];
> +
> + /*
> + * DMA (thus cache coherency maintenance) requires the
> + * transfer buffers to live in their own cache lines.
> + */
> + union {
> + __be32 d32;
> + u8 d8[4];
> + } data[2] ____cacheline_aligned;
> +};
> +
> +enum ad5764_type {
> + ID_AD5744,
> + ID_AD5744R,
> + ID_AD5764,
> + ID_AD5764R,
> +};
> +
> +#define AD5764_CHANNEL(_chan, _bits) { \
> + .type = IIO_VOLTAGE, \
> + .indexed = 1, \
> + .output = 1, \
> + .channel = (_chan), \
> + .address = (_chan), \
> + .info_mask = IIO_CHAN_INFO_OFFSET_SHARED_BIT | \
> + IIO_CHAN_INFO_SCALE_SEPARATE_BIT | \
> + IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT | \
> + IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT, \
> + .scan_type = IIO_ST('u', (_bits), 16, 16 - (_bits)) \
> +}
> +
> +#define DECLARE_AD5764_CHANNELS(_name, _bits) \
> +const struct iio_chan_spec _name##_channels[] = { \
> + AD5764_CHANNEL(0, (_bits)), \
> + AD5764_CHANNEL(1, (_bits)), \
> + AD5764_CHANNEL(2, (_bits)), \
> + AD5764_CHANNEL(3, (_bits)), \
> +};
> +
> +static DECLARE_AD5764_CHANNELS(ad5764, 16);
> +static DECLARE_AD5764_CHANNELS(ad5744, 14);
> +
> +static const struct ad5764_chip_info ad5764_chip_infos[] = {
> + [ID_AD5744] = {
> + .int_vref = 0,
> + .channels = ad5744_channels,
> + },
> + [ID_AD5744R] = {
> + .int_vref = 5000000,
> + .channels = ad5744_channels,
> + },
> + [ID_AD5764] = {
> + .int_vref = 0,
> + .channels = ad5764_channels,
> + },
> + [ID_AD5764R] = {
> + .int_vref = 5000000,
> + .channels = ad5764_channels,
> + },
> +};
> +
> +static int ad5764_write(struct iio_dev *indio_dev, unsigned int reg,
> + unsigned int val)
> +{
> + struct ad5764_state *st = iio_priv(indio_dev);
> + int ret;
> +
> + mutex_lock(&indio_dev->mlock);
> + st->data[0].d32 = cpu_to_be32((reg << 16) | val);
> +
> + ret = spi_write(st->spi, &st->data[0].d8[1], 3);
> + mutex_unlock(&indio_dev->mlock);
> +
> + return ret;
> +}
> +
> +static int ad5764_read(struct iio_dev *indio_dev, unsigned int reg,
> + unsigned int *val)
> +{
> + struct ad5764_state *st = iio_priv(indio_dev);
> + struct spi_message m;
> + int ret;
> + struct spi_transfer t[] = {
> + {
> + .tx_buf = &st->data[0].d8[1],
> + .len = 3,
> + .cs_change = 1,
> + }, {
> + .rx_buf = &st->data[1].d8[1],
> + .len = 3,
> + },
> + };
> +
> + spi_message_init(&m);
> + spi_message_add_tail(&t[0], &m);
> + spi_message_add_tail(&t[1], &m);
> +
> + mutex_lock(&indio_dev->mlock);
> +
> + st->data[0].d32 = cpu_to_be32((1 << 23) | (reg << 16));
> +
> + ret = spi_sync(st->spi, &m);
> + if (ret >= 0)
> + *val = be32_to_cpu(st->data[1].d32) & 0xffff;
> +
> + mutex_unlock(&indio_dev->mlock);
> +
> + return ret;
> +}
> +
> +static int ad5764_chan_info_to_reg(struct iio_chan_spec const *chan, long info)
> +{
> + switch (info) {
> + case 0:
> + return AD5764_REG_DATA(chan->address);
> + case IIO_CHAN_INFO_CALIBBIAS:
> + return AD5764_REG_OFFSET(chan->address);
> + case IIO_CHAN_INFO_CALIBSCALE:
> + return AD5764_REG_FINE_GAIN(chan->address);
> + default:
> + BUG();
Should we BUG here?
Is it that severe because it will halt the whole system?
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static int ad5764_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int val, int val2, long info)
> +{
> + const int max_val = (1 << chan->scan_type.realbits);
> + unsigned int reg;
> +
> + switch (info) {
> + case 0:
> + if (val >= max_val || val < 0)
> + return -EINVAL;
> + val <<= chan->scan_type.shift;
> + break;
> + case IIO_CHAN_INFO_CALIBBIAS:
> + if (val >= 128 || val < -128)
> + return -EINVAL;
> + break;
> + case IIO_CHAN_INFO_CALIBSCALE:
> + if (val >= 32 || val < -32)
> + return -EINVAL;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + reg = ad5764_chan_info_to_reg(chan, info);
> + return ad5764_write(indio_dev, reg, (u16)val);
> +}
> +
> +static int ad5764_get_channel_vref(struct ad5764_state *st,
> + unsigned int channel)
> +{
> + if (st->chip_info->int_vref)
> + return st->chip_info->int_vref;
> + else
> + return regulator_get_voltage(st->vref_reg[channel / 2].consumer);
> +}
> +
> +static int ad5764_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int *val, int *val2, long info)
> +{
> + struct ad5764_state *st = iio_priv(indio_dev);
> + unsigned long scale_uv;
> + unsigned int reg;
> + int vref;
> + int ret;
> +
> + switch (info) {
> + case 0:
> + reg = AD5764_REG_DATA(chan->address);
> + ret = ad5764_read(indio_dev, reg, val);
> + if (ret < 0)
> + return ret;
> + *val >>= chan->scan_type.shift;
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_CALIBBIAS:
> + reg = AD5764_REG_OFFSET(chan->address);
> + ret = ad5764_read(indio_dev, reg, val);
> + if (ret < 0)
> + return ret;
> + *val = sign_extend32(*val, 7);
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_CALIBSCALE:
> + reg = AD5764_REG_FINE_GAIN(chan->address);
> + ret = ad5764_read(indio_dev, reg, val);
> + if (ret < 0)
> + return ret;
> + *val = sign_extend32(*val, 5);
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_SCALE:
> + /* vout = 4 * vref + ((dac_code / 65535) - 0.5) */
> + vref = ad5764_get_channel_vref(st, chan->channel);
> + if (vref < 0)
> + return vref;
> +
> + scale_uv = (vref * 4 * 100) >> chan->scan_type.realbits;
> + *val = scale_uv / 100000;
> + *val2 = (scale_uv % 100000) * 10;
> + return IIO_VAL_INT_PLUS_MICRO;
> + case IIO_CHAN_INFO_OFFSET:
> + *val = -(1 << chan->scan_type.realbits) / 2;
> + return IIO_VAL_INT;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static const struct iio_info ad5764_info = {
> + .read_raw = ad5764_read_raw,
> + .write_raw = ad5764_write_raw,
> + .driver_module = THIS_MODULE,
> +};
> +
> +static int __devinit ad5764_probe(struct spi_device *spi)
> +{
> + enum ad5764_type type = spi_get_device_id(spi)->driver_data;
> + struct iio_dev *indio_dev;
> + struct ad5764_state *st;
> + int ret;
> +
> + indio_dev = iio_allocate_device(sizeof(*st));
> + if (indio_dev == NULL) {
> + dev_err(&spi->dev, "Failed to allocate iio device\n");
> + return -ENOMEM;
> + }
> +
> + st = iio_priv(indio_dev);
> + spi_set_drvdata(spi, indio_dev);
> +
> + st->spi = spi;
> + st->chip_info = &ad5764_chip_infos[type];
> +
> + indio_dev->dev.parent = &spi->dev;
> + indio_dev->name = spi_get_device_id(spi)->name;
> + indio_dev->info = &ad5764_info;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> + indio_dev->num_channels = AD5764_NUM_CHANNELS;
> + indio_dev->channels = st->chip_info->channels;
> +
> + if (st->chip_info->int_vref == 0) {
> + st->vref_reg[0].supply = "vrefAB";
> + st->vref_reg[1].supply = "vrefCD";
> +
> + ret = regulator_bulk_get(&st->spi->dev,
> + ARRAY_SIZE(st->vref_reg), st->vref_reg);
> + if (ret) {
> + dev_err(&spi->dev, "Failed to request vref regulators: %d\n",
> + ret);
> + goto error_free;
> + }
> +
> + ret = regulator_bulk_enable(ARRAY_SIZE(st->vref_reg),
> + st->vref_reg);
> + if (ret) {
> + dev_err(&spi->dev, "Failed to enable vref regulators: %d\n",
> + ret);
> + goto error_free_reg;
> + }
> + }
> +
> + ret = iio_device_register(indio_dev);
> + if (ret) {
> + dev_err(&spi->dev, "Failed to register iio device: %d\n", ret);
> + goto error_disable_reg;
> + }
> +
> + return 0;
> +
> +error_disable_reg:
> + if (st->chip_info->int_vref == 0)
> + regulator_bulk_disable(ARRAY_SIZE(st->vref_reg), st->vref_reg);
> +error_free_reg:
> + if (st->chip_info->int_vref == 0)
> + regulator_bulk_free(ARRAY_SIZE(st->vref_reg), st->vref_reg);
> +error_free:
> + iio_free_device(indio_dev);
> +
> + return ret;
> +}
> +
> +static int __devexit ad5764_remove(struct spi_device *spi)
> +{
> + struct iio_dev *indio_dev = spi_get_drvdata(spi);
> + struct ad5764_state *st = iio_priv(indio_dev);
> +
> + iio_device_unregister(indio_dev);
> +
> + if (st->chip_info->int_vref == 0) {
> + regulator_bulk_disable(ARRAY_SIZE(st->vref_reg), st->vref_reg);
> + regulator_bulk_free(ARRAY_SIZE(st->vref_reg), st->vref_reg);
> + }
> +
> + iio_free_device(indio_dev);
> +
> + return 0;
> +}
> +
> +static const struct spi_device_id ad5764_ids[] = {
> + { "ad5744", ID_AD5744 },
> + { "ad5744r", ID_AD5744R },
> + { "ad5764", ID_AD5764 },
> + { "ad5764r", ID_AD5764R },
> + { }
> +};
> +MODULE_DEVICE_TABLE(spi, ad5764_ids);
> +
> +static struct spi_driver ad5764_driver = {
> + .driver = {
> + .name = "ad5764",
> + .owner = THIS_MODULE,
> + },
> + .probe = ad5764_probe,
> + .remove = __devexit_p(ad5764_remove),
> + .id_table = ad5764_ids,
> +};
> +
> +static __init int ad5764_spi_init(void)
> +{
> + return spi_register_driver(&ad5764_driver);
> +}
> +module_init(ad5764_spi_init);
> +
> +static __exit void ad5764_spi_exit(void)
> +{
> + spi_unregister_driver(&ad5764_driver);
> +}
> +module_exit(ad5764_spi_exit);
> +
> +MODULE_AUTHOR("Lars-Peter Clausen <lars@xxxxxxxxxx>");
> +MODULE_DESCRIPTION("Analog Devices AD5744/AD5744R/AD5764/AD5764R DAC");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.7.1
>
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