1 files changed, 393 insertions, 0 deletions

diff --git a/drivers/iio/dac/ad5446.c b/drivers/iio/dac/ad5446.c
new file mode 100644
index 000000000000..2ca5059ef89e
--- /dev/null
+++ b/drivers/iio/dac/ad5446.c
@@ -0,0 +1,393 @@
+/*
+ * AD5446 SPI DAC driver
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "ad5446.h"
+
+static int ad5446_write(struct ad5446_state *st, unsigned val)
+{
+        __be16 data = cpu_to_be16(val);
+        return spi_write(st->spi, &data, sizeof(data));
+}
+
+static int ad5660_write(struct ad5446_state *st, unsigned val)
+{
+        uint8_t data[3];
+
+        data[0] = (val >> 16) & 0xFF;
+        data[1] = (val >> 8) & 0xFF;
+        data[2] = val & 0xFF;
+
+        return spi_write(st->spi, data, sizeof(data));
+}
+
+static const char * const ad5446_powerdown_modes[] = {
+        "1kohm_to_gnd", "100kohm_to_gnd", "three_state"
+};
+
+static int ad5446_set_powerdown_mode(struct iio_dev *indio_dev,
+        const struct iio_chan_spec *chan, unsigned int mode)
+{
+        struct ad5446_state *st = iio_priv(indio_dev);
+
+        st->pwr_down_mode = mode + 1;
+
+        return 0;
+}
+
+static int ad5446_get_powerdown_mode(struct iio_dev *indio_dev,
+        const struct iio_chan_spec *chan)
+{
+        struct ad5446_state *st = iio_priv(indio_dev);
+
+        return st->pwr_down_mode - 1;
+}
+
+static const struct iio_enum ad5446_powerdown_mode_enum = {
+        .items = ad5446_powerdown_modes,
+        .num_items = ARRAY_SIZE(ad5446_powerdown_modes),
+        .get = ad5446_get_powerdown_mode,
+        .set = ad5446_set_powerdown_mode,
+};
+
+static ssize_t ad5446_read_dac_powerdown(struct iio_dev *indio_dev,
+                                           uintptr_t private,
+                                           const struct iio_chan_spec *chan,
+                                           char *buf)
+{
+        struct ad5446_state *st = iio_priv(indio_dev);
+
+        return sprintf(buf, "%d\n", st->pwr_down);
+}
+
+static ssize_t ad5446_write_dac_powerdown(struct iio_dev *indio_dev,
+                                            uintptr_t private,
+                                            const struct iio_chan_spec *chan,
+                                            const char *buf, size_t len)
+{
+        struct ad5446_state *st = iio_priv(indio_dev);
+        unsigned int shift;
+        unsigned int val;
+        bool powerdown;
+        int ret;
+
+        ret = strtobool(buf, &powerdown);
+        if (ret)
+                return ret;
+
+        mutex_lock(&indio_dev->mlock);
+        st->pwr_down = powerdown;
+
+        if (st->pwr_down) {
+                shift = chan->scan_type.realbits + chan->scan_type.shift;
+                val = st->pwr_down_mode << shift;
+        } else {
+                val = st->cached_val;
+        }
+
+        ret = st->chip_info->write(st, val);
+        mutex_unlock(&indio_dev->mlock);
+
+        return ret ? ret : len;
+}
+
+static const struct iio_chan_spec_ext_info ad5064_ext_info_powerdown[] = {
+        {
+                .name = "powerdown",
+                .read = ad5446_read_dac_powerdown,
+                .write = ad5446_write_dac_powerdown,
+        },
+        IIO_ENUM("powerdown_mode", false, &ad5446_powerdown_mode_enum),
+        IIO_ENUM_AVAILABLE("powerdown_mode", &ad5446_powerdown_mode_enum),
+        { },
+};
+
+#define _AD5446_CHANNEL(bits, storage, shift, ext) { \
+        .type = IIO_VOLTAGE, \
+        .indexed = 1, \
+        .output = 1, \
+        .channel = 0, \
+        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
+        IIO_CHAN_INFO_SCALE_SHARED_BIT, \
+        .scan_type = IIO_ST('u', (bits), (storage), (shift)), \
+        .ext_info = (ext), \
+}
+
+#define AD5446_CHANNEL(bits, storage, shift) \
+        _AD5446_CHANNEL(bits, storage, shift, NULL)
+
+#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
+        _AD5446_CHANNEL(bits, storage, shift, ad5064_ext_info_powerdown)
+
+static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
+        [ID_AD5444] = {
+                .channel = AD5446_CHANNEL(12, 16, 2),
+                .write = ad5446_write,
+        },
+        [ID_AD5446] = {
+                .channel = AD5446_CHANNEL(14, 16, 0),
+                .write = ad5446_write,
+        },
+        [ID_AD5450] = {
+                .channel = AD5446_CHANNEL(8, 16, 6),
+                .write = ad5446_write,
+        },
+        [ID_AD5451] = {
+                .channel = AD5446_CHANNEL(10, 16, 4),
+                .write = ad5446_write,
+        },
+        [ID_AD5541A] = {
+                .channel = AD5446_CHANNEL(16, 16, 0),
+                .write = ad5446_write,
+        },
+        [ID_AD5512A] = {
+                .channel = AD5446_CHANNEL(12, 16, 4),
+                .write = ad5446_write,
+        },
+        [ID_AD5553] = {
+                .channel = AD5446_CHANNEL(14, 16, 0),
+                .write = ad5446_write,
+        },
+        [ID_AD5601] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(8, 16, 6),
+                .write = ad5446_write,
+        },
+        [ID_AD5611] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(10, 16, 4),
+                .write = ad5446_write,
+        },
+        [ID_AD5621] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
+                .write = ad5446_write,
+        },
+        [ID_AD5620_2500] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
+                .int_vref_mv = 2500,
+                .write = ad5446_write,
+        },
+        [ID_AD5620_1250] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(12, 16, 2),
+                .int_vref_mv = 1250,
+                .write = ad5446_write,
+        },
+        [ID_AD5640_2500] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
+                .int_vref_mv = 2500,
+                .write = ad5446_write,
+        },
+        [ID_AD5640_1250] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(14, 16, 0),
+                .int_vref_mv = 1250,
+                .write = ad5446_write,
+        },
+        [ID_AD5660_2500] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
+                .int_vref_mv = 2500,
+                .write = ad5660_write,
+        },
+        [ID_AD5660_1250] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
+                .int_vref_mv = 1250,
+                .write = ad5660_write,
+        },
+        [ID_AD5662] = {
+                .channel = AD5446_CHANNEL_POWERDOWN(16, 16, 0),
+                .write = ad5660_write,
+        },
+};
+
+static int ad5446_read_raw(struct iio_dev *indio_dev,
+                           struct iio_chan_spec const *chan,
+                           int *val,
+                           int *val2,
+                           long m)
+{
+        struct ad5446_state *st = iio_priv(indio_dev);
+        unsigned long scale_uv;
+
+        switch (m) {
+        case IIO_CHAN_INFO_RAW:
+                *val = st->cached_val;
+                return IIO_VAL_INT;
+        case IIO_CHAN_INFO_SCALE:
+                scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
+                *val =  scale_uv / 1000;
+                *val2 = (scale_uv % 1000) * 1000;
+                return IIO_VAL_INT_PLUS_MICRO;
+
+        }
+        return -EINVAL;
+}
+
+static int ad5446_write_raw(struct iio_dev *indio_dev,
+                               struct iio_chan_spec const *chan,
+                               int val,
+                               int val2,
+                               long mask)
+{
+        struct ad5446_state *st = iio_priv(indio_dev);
+        int ret = 0;
+
+        switch (mask) {
+        case IIO_CHAN_INFO_RAW:
+                if (val >= (1 << chan->scan_type.realbits) || val < 0)
+                        return -EINVAL;
+
+                val <<= chan->scan_type.shift;
+                mutex_lock(&indio_dev->mlock);
+                st->cached_val = val;
+                if (!st->pwr_down)
+                        ret = st->chip_info->write(st, val);
+                mutex_unlock(&indio_dev->mlock);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
+static const struct iio_info ad5446_info = {
+        .read_raw = ad5446_read_raw,
+        .write_raw = ad5446_write_raw,
+        .driver_module = THIS_MODULE,
+};
+
+static int __devinit ad5446_probe(struct spi_device *spi)
+{
+        struct ad5446_state *st;
+        struct iio_dev *indio_dev;
+        struct regulator *reg;
+        int ret, voltage_uv = 0;
+
+        reg = regulator_get(&spi->dev, "vcc");
+        if (!IS_ERR(reg)) {
+                ret = regulator_enable(reg);
+                if (ret)
+                        goto error_put_reg;
+
+                voltage_uv = regulator_get_voltage(reg);
+        }
+
+        indio_dev = iio_device_alloc(sizeof(*st));
+        if (indio_dev == NULL) {
+                ret = -ENOMEM;
+                goto error_disable_reg;
+        }
+        st = iio_priv(indio_dev);
+        st->chip_info =
+                &ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];
+
+        spi_set_drvdata(spi, indio_dev);
+        st->reg = reg;
+        st->spi = spi;
+
+        /* Establish that the iio_dev is a child of the spi device */
+        indio_dev->dev.parent = &spi->dev;
+        indio_dev->name = spi_get_device_id(spi)->name;
+        indio_dev->info = &ad5446_info;
+        indio_dev->modes = INDIO_DIRECT_MODE;
+        indio_dev->channels = &st->chip_info->channel;
+        indio_dev->num_channels = 1;
+
+        st->pwr_down_mode = MODE_PWRDWN_1k;
+
+        if (st->chip_info->int_vref_mv)
+                st->vref_mv = st->chip_info->int_vref_mv;
+        else if (voltage_uv)
+                st->vref_mv = voltage_uv / 1000;
+        else
+                dev_warn(&spi->dev, "reference voltage unspecified\n");
+
+        ret = iio_device_register(indio_dev);
+        if (ret)
+                goto error_free_device;
+
+        return 0;
+
+error_free_device:
+        iio_device_free(indio_dev);
+error_disable_reg:
+        if (!IS_ERR(reg))
+                regulator_disable(reg);
+error_put_reg:
+        if (!IS_ERR(reg))
+                regulator_put(reg);
+
+        return ret;
+}
+
+static int ad5446_remove(struct spi_device *spi)
+{
+        struct iio_dev *indio_dev = spi_get_drvdata(spi);
+        struct ad5446_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 ad5446_id[] = {
+        {"ad5444", ID_AD5444},
+        {"ad5446", ID_AD5446},
+        {"ad5450", ID_AD5450},
+        {"ad5451", ID_AD5451},
+        {"ad5452", ID_AD5444}, /* ad5452 is compatible to the ad5444 */
+        {"ad5453", ID_AD5446}, /* ad5453 is compatible to the ad5446 */
+        {"ad5512a", ID_AD5512A},
+        {"ad5541a", ID_AD5541A},
+        {"ad5542a", ID_AD5541A}, /* ad5541a and ad5542a are compatible */
+        {"ad5543", ID_AD5541A}, /* ad5541a and ad5543 are compatible */
+        {"ad5553", ID_AD5553},
+        {"ad5601", ID_AD5601},
+        {"ad5611", ID_AD5611},
+        {"ad5621", ID_AD5621},
+        {"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
+        {"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
+        {"ad5640-2500", ID_AD5640_2500},
+        {"ad5640-1250", ID_AD5640_1250},
+        {"ad5660-2500", ID_AD5660_2500},
+        {"ad5660-1250", ID_AD5660_1250},
+        {"ad5662", ID_AD5662},
+        {}
+};
+MODULE_DEVICE_TABLE(spi, ad5446_id);
+
+static struct spi_driver ad5446_driver = {
+        .driver = {
+                .name   = "ad5446",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = ad5446_probe,
+        .remove         = __devexit_p(ad5446_remove),
+        .id_table       = ad5446_id,
+};
+module_spi_driver(ad5446_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
+MODULE_LICENSE("GPL v2");