staging:iio: Move DAC drivers out of staging

The IIO DAC drivers are in a reasonably good shape. They all make use of channel
spec and non of them provides non-documented sysfs attributes. Code style should
be OK as well, both checkpatch and coccicheck only report trivial issues.

So lets move the whole folder out of staging.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 485 insertions, 0 deletions

diff --git a/drivers/iio/dac/ad5791.c b/drivers/iio/dac/ad5791.c
new file mode 100644
index 000000000000..2bd2e37280ff
--- /dev/null
+++ b/drivers/iio/dac/ad5791.c
@@ -0,0 +1,485 @@
+/*
+ * AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog
+ * Converter
+ *
+ * Copyright 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 <linux/iio/dac/ad5791.h>
+
+#define AD5791_RES_MASK(x)              ((1 << (x)) - 1)
+#define AD5791_DAC_MASK                 AD5791_RES_MASK(20)
+#define AD5791_DAC_MSB                  (1 << 19)
+
+#define AD5791_CMD_READ                 (1 << 23)
+#define AD5791_CMD_WRITE                (0 << 23)
+#define AD5791_ADDR(addr)               ((addr) << 20)
+
+/* Registers */
+#define AD5791_ADDR_NOOP                0
+#define AD5791_ADDR_DAC0                1
+#define AD5791_ADDR_CTRL                2
+#define AD5791_ADDR_CLRCODE             3
+#define AD5791_ADDR_SW_CTRL             4
+
+/* Control Register */
+#define AD5791_CTRL_RBUF                (1 << 1)
+#define AD5791_CTRL_OPGND               (1 << 2)
+#define AD5791_CTRL_DACTRI              (1 << 3)
+#define AD5791_CTRL_BIN2SC              (1 << 4)
+#define AD5791_CTRL_SDODIS              (1 << 5)
+#define AD5761_CTRL_LINCOMP(x)          ((x) << 6)
+
+#define AD5791_LINCOMP_0_10             0
+#define AD5791_LINCOMP_10_12            1
+#define AD5791_LINCOMP_12_16            2
+#define AD5791_LINCOMP_16_19            3
+#define AD5791_LINCOMP_19_20            12
+
+#define AD5780_LINCOMP_0_10             0
+#define AD5780_LINCOMP_10_20            12
+
+/* Software Control Register */
+#define AD5791_SWCTRL_LDAC              (1 << 0)
+#define AD5791_SWCTRL_CLR               (1 << 1)
+#define AD5791_SWCTRL_RESET             (1 << 2)
+
+#define AD5791_DAC_PWRDN_6K             0
+#define AD5791_DAC_PWRDN_3STATE         1
+
+/**
+ * struct ad5791_chip_info - chip specific information
+ * @get_lin_comp:       function pointer to the device specific function
+ */
+
+struct ad5791_chip_info {
+        int (*get_lin_comp)     (unsigned int span);
+};
+
+/**
+ * struct ad5791_state - driver instance specific data
+ * @us:                 spi_device
+ * @reg_vdd:            positive supply regulator
+ * @reg_vss:            negative supply regulator
+ * @chip_info:          chip model specific constants
+ * @vref_mv:            actual reference voltage used
+ * @vref_neg_mv:        voltage of the negative supply
+ * @pwr_down_mode       current power down mode
+ */
+
+struct ad5791_state {
+        struct spi_device               *spi;
+        struct regulator                *reg_vdd;
+        struct regulator                *reg_vss;
+        const struct ad5791_chip_info   *chip_info;
+        unsigned short                  vref_mv;
+        unsigned int                    vref_neg_mv;
+        unsigned                        ctrl;
+        unsigned                        pwr_down_mode;
+        bool                            pwr_down;
+};
+
+/**
+ * ad5791_supported_device_ids:
+ */
+
+enum ad5791_supported_device_ids {
+        ID_AD5760,
+        ID_AD5780,
+        ID_AD5781,
+        ID_AD5791,
+};
+
+static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val)
+{
+        union {
+                u32 d32;
+                u8 d8[4];
+        } data;
+
+        data.d32 = cpu_to_be32(AD5791_CMD_WRITE |
+                              AD5791_ADDR(addr) |
+                              (val & AD5791_DAC_MASK));
+
+        return spi_write(spi, &data.d8[1], 3);
+}
+
+static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val)
+{
+        union {
+                u32 d32;
+                u8 d8[4];
+        } data[3];
+        int ret;
+        struct spi_message msg;
+        struct spi_transfer xfers[] = {
+                {
+                        .tx_buf = &data[0].d8[1],
+                        .bits_per_word = 8,
+                        .len = 3,
+                        .cs_change = 1,
+                }, {
+                        .tx_buf = &data[1].d8[1],
+                        .rx_buf = &data[2].d8[1],
+                        .bits_per_word = 8,
+                        .len = 3,
+                },
+        };
+
+        data[0].d32 = cpu_to_be32(AD5791_CMD_READ |
+                              AD5791_ADDR(addr));
+        data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));
+
+        spi_message_init(&msg);
+        spi_message_add_tail(&xfers[0], &msg);
+        spi_message_add_tail(&xfers[1], &msg);
+        ret = spi_sync(spi, &msg);
+
+        *val = be32_to_cpu(data[2].d32);
+
+        return ret;
+}
+
+static const char * const ad5791_powerdown_modes[] = {
+        "6kohm_to_gnd",
+        "three_state",
+};
+
+static int ad5791_get_powerdown_mode(struct iio_dev *indio_dev,
+        const struct iio_chan_spec *chan)
+{
+        struct ad5791_state *st = iio_priv(indio_dev);
+
+        return st->pwr_down_mode;
+}
+
+static int ad5791_set_powerdown_mode(struct iio_dev *indio_dev,
+        const struct iio_chan_spec *chan, unsigned int mode)
+{
+        struct ad5791_state *st = iio_priv(indio_dev);
+
+        st->pwr_down_mode = mode;
+
+        return 0;
+}
+
+static const struct iio_enum ad5791_powerdown_mode_enum = {
+        .items = ad5791_powerdown_modes,
+        .num_items = ARRAY_SIZE(ad5791_powerdown_modes),
+        .get = ad5791_get_powerdown_mode,
+        .set = ad5791_set_powerdown_mode,
+};
+
+static ssize_t ad5791_read_dac_powerdown(struct iio_dev *indio_dev,
+        uintptr_t private, const struct iio_chan_spec *chan, char *buf)
+{
+        struct ad5791_state *st = iio_priv(indio_dev);
+
+        return sprintf(buf, "%d\n", st->pwr_down);
+}
+
+static ssize_t ad5791_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 ad5791_state *st = iio_priv(indio_dev);
+
+        ret = strtobool(buf, &pwr_down);
+        if (ret)
+                return ret;
+
+        if (!pwr_down) {
+                st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
+        } else {
+                if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)
+                        st->ctrl |= AD5791_CTRL_OPGND;
+                else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)
+                        st->ctrl |= AD5791_CTRL_DACTRI;
+        }
+        st->pwr_down = pwr_down;
+
+        ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl);
+
+        return ret ? ret : len;
+}
+
+static int ad5791_get_lin_comp(unsigned int span)
+{
+        if (span <= 10000)
+                return AD5791_LINCOMP_0_10;
+        else if (span <= 12000)
+                return AD5791_LINCOMP_10_12;
+        else if (span <= 16000)
+                return AD5791_LINCOMP_12_16;
+        else if (span <= 19000)
+                return AD5791_LINCOMP_16_19;
+        else
+                return AD5791_LINCOMP_19_20;
+}
+
+static int ad5780_get_lin_comp(unsigned int span)
+{
+        if (span <= 10000)
+                return AD5780_LINCOMP_0_10;
+        else
+                return AD5780_LINCOMP_10_20;
+}
+static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
+        [ID_AD5760] = {
+                .get_lin_comp = ad5780_get_lin_comp,
+        },
+        [ID_AD5780] = {
+                .get_lin_comp = ad5780_get_lin_comp,
+        },
+        [ID_AD5781] = {
+                .get_lin_comp = ad5791_get_lin_comp,
+        },
+        [ID_AD5791] = {
+                .get_lin_comp = ad5791_get_lin_comp,
+        },
+};
+
+static int ad5791_read_raw(struct iio_dev *indio_dev,
+                           struct iio_chan_spec const *chan,
+                           int *val,
+                           int *val2,
+                           long m)
+{
+        struct ad5791_state *st = iio_priv(indio_dev);
+        u64 val64;
+        int ret;
+
+        switch (m) {
+        case IIO_CHAN_INFO_RAW:
+                ret = ad5791_spi_read(st->spi, chan->address, val);
+                if (ret)
+                        return ret;
+                *val &= AD5791_DAC_MASK;
+                *val >>= chan->scan_type.shift;
+                return IIO_VAL_INT;
+        case IIO_CHAN_INFO_SCALE:
+                *val = 0;
+                *val2 = (((u64)st->vref_mv) * 1000000ULL) >> chan->scan_type.realbits;
+                return IIO_VAL_INT_PLUS_MICRO;
+        case IIO_CHAN_INFO_OFFSET:
+                val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits);
+                do_div(val64, st->vref_mv);
+                *val = -val64;
+                return IIO_VAL_INT;
+        default:
+                return -EINVAL;
+        }
+
+};
+
+static const struct iio_chan_spec_ext_info ad5791_ext_info[] = {
+        {
+                .name = "powerdown",
+                .shared = true,
+                .read = ad5791_read_dac_powerdown,
+                .write = ad5791_write_dac_powerdown,
+        },
+        IIO_ENUM("powerdown_mode", true, &ad5791_powerdown_mode_enum),
+        IIO_ENUM_AVAILABLE("powerdown_mode", &ad5791_powerdown_mode_enum),
+        { },
+};
+
+#define AD5791_CHAN(bits, shift) {                      \
+        .type = IIO_VOLTAGE,                            \
+        .output = 1,                                    \
+        .indexed = 1,                                   \
+        .address = AD5791_ADDR_DAC0,                    \
+        .channel = 0,                                   \
+        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |   \
+                IIO_CHAN_INFO_SCALE_SHARED_BIT |        \
+                IIO_CHAN_INFO_OFFSET_SHARED_BIT,        \
+        .scan_type = IIO_ST('u', bits, 24, shift),      \
+        .ext_info = ad5791_ext_info,                    \
+}
+
+static const struct iio_chan_spec ad5791_channels[] = {
+        [ID_AD5760] = AD5791_CHAN(16, 4),
+        [ID_AD5780] = AD5791_CHAN(18, 2),
+        [ID_AD5781] = AD5791_CHAN(18, 2),
+        [ID_AD5791] = AD5791_CHAN(20, 0)
+};
+
+static int ad5791_write_raw(struct iio_dev *indio_dev,
+                            struct iio_chan_spec const *chan,
+                            int val,
+                            int val2,
+                            long mask)
+{
+        struct ad5791_state *st = iio_priv(indio_dev);
+
+        switch (mask) {
+        case IIO_CHAN_INFO_RAW:
+                val &= AD5791_RES_MASK(chan->scan_type.realbits);
+                val <<= chan->scan_type.shift;
+
+                return ad5791_spi_write(st->spi, chan->address, val);
+
+        default:
+                return -EINVAL;
+        }
+}
+
+static const struct iio_info ad5791_info = {
+        .read_raw = &ad5791_read_raw,
+        .write_raw = &ad5791_write_raw,
+        .driver_module = THIS_MODULE,
+};
+
+static int __devinit ad5791_probe(struct spi_device *spi)
+{
+        struct ad5791_platform_data *pdata = spi->dev.platform_data;
+        struct iio_dev *indio_dev;
+        struct ad5791_state *st;
+        int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
+
+        indio_dev = iio_device_alloc(sizeof(*st));
+        if (indio_dev == NULL) {
+                ret = -ENOMEM;
+                goto error_ret;
+        }
+        st = iio_priv(indio_dev);
+        st->reg_vdd = regulator_get(&spi->dev, "vdd");
+        if (!IS_ERR(st->reg_vdd)) {
+                ret = regulator_enable(st->reg_vdd);
+                if (ret)
+                        goto error_put_reg_pos;
+
+                pos_voltage_uv = regulator_get_voltage(st->reg_vdd);
+        }
+
+        st->reg_vss = regulator_get(&spi->dev, "vss");
+        if (!IS_ERR(st->reg_vss)) {
+                ret = regulator_enable(st->reg_vss);
+                if (ret)
+                        goto error_put_reg_neg;
+
+                neg_voltage_uv = regulator_get_voltage(st->reg_vss);
+        }
+
+        st->pwr_down = true;
+        st->spi = spi;
+
+        if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
+                st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
+                st->vref_neg_mv = neg_voltage_uv / 1000;
+        } else if (pdata) {
+                st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv;
+                st->vref_neg_mv = pdata->vref_neg_mv;
+        } else {
+                dev_warn(&spi->dev, "reference voltage unspecified\n");
+        }
+
+        ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
+        if (ret)
+                goto error_disable_reg_neg;
+
+        st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi)
+                                              ->driver_data];
+
+
+        st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
+                  | ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
+                  AD5791_CTRL_BIN2SC;
+
+        ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl |
+                AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
+        if (ret)
+                goto error_disable_reg_neg;
+
+        spi_set_drvdata(spi, indio_dev);
+        indio_dev->dev.parent = &spi->dev;
+        indio_dev->info = &ad5791_info;
+        indio_dev->modes = INDIO_DIRECT_MODE;
+        indio_dev->channels
+                = &ad5791_channels[spi_get_device_id(spi)->driver_data];
+        indio_dev->num_channels = 1;
+        indio_dev->name = spi_get_device_id(st->spi)->name;
+        ret = iio_device_register(indio_dev);
+        if (ret)
+                goto error_disable_reg_neg;
+
+        return 0;
+
+error_disable_reg_neg:
+        if (!IS_ERR(st->reg_vss))
+                regulator_disable(st->reg_vss);
+error_put_reg_neg:
+        if (!IS_ERR(st->reg_vss))
+                regulator_put(st->reg_vss);
+
+        if (!IS_ERR(st->reg_vdd))
+                regulator_disable(st->reg_vdd);
+error_put_reg_pos:
+        if (!IS_ERR(st->reg_vdd))
+                regulator_put(st->reg_vdd);
+        iio_device_free(indio_dev);
+error_ret:
+
+        return ret;
+}
+
+static int __devexit ad5791_remove(struct spi_device *spi)
+{
+        struct iio_dev *indio_dev = spi_get_drvdata(spi);
+        struct ad5791_state *st = iio_priv(indio_dev);
+
+        iio_device_unregister(indio_dev);
+        if (!IS_ERR(st->reg_vdd)) {
+                regulator_disable(st->reg_vdd);
+                regulator_put(st->reg_vdd);
+        }
+
+        if (!IS_ERR(st->reg_vss)) {
+                regulator_disable(st->reg_vss);
+                regulator_put(st->reg_vss);
+        }
+        iio_device_free(indio_dev);
+
+        return 0;
+}
+
+static const struct spi_device_id ad5791_id[] = {
+        {"ad5760", ID_AD5760},
+        {"ad5780", ID_AD5780},
+        {"ad5781", ID_AD5781},
+        {"ad5790", ID_AD5791},
+        {"ad5791", ID_AD5791},
+        {}
+};
+MODULE_DEVICE_TABLE(spi, ad5791_id);
+
+static struct spi_driver ad5791_driver = {
+        .driver = {
+                   .name = "ad5791",
+                   .owner = THIS_MODULE,
+                   },
+        .probe = ad5791_probe,
+        .remove = __devexit_p(ad5791_remove),
+        .id_table = ad5791_id,
+};
+module_spi_driver(ad5791_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC");
+MODULE_LICENSE("GPL v2");