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, 243 insertions, 0 deletions

diff --git a/drivers/iio/dac/max517.c b/drivers/iio/dac/max517.c
new file mode 100644
index 000000000000..92c77c82026c
--- /dev/null
+++ b/drivers/iio/dac/max517.c
@@ -0,0 +1,243 @@
+/*
+ *  max517.c - Support for Maxim MAX517, MAX518 and MAX519
+ *
+ *  Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/dac/max517.h>
+
+#define MAX517_DRV_NAME "max517"
+
+/* Commands */
+#define COMMAND_CHANNEL0        0x00
+#define COMMAND_CHANNEL1        0x01 /* for MAX518 and MAX519 */
+#define COMMAND_PD              0x08 /* Power Down */
+
+enum max517_device_ids {
+        ID_MAX517,
+        ID_MAX518,
+        ID_MAX519,
+};
+
+struct max517_data {
+        struct iio_dev          *indio_dev;
+        struct i2c_client       *client;
+        unsigned short          vref_mv[2];
+};
+
+/*
+ * channel: bit 0: channel 1
+ *          bit 1: channel 2
+ * (this way, it's possible to set both channels at once)
+ */
+static int max517_set_value(struct iio_dev *indio_dev,
+        long val, int channel)
+{
+        struct max517_data *data = iio_priv(indio_dev);
+        struct i2c_client *client = data->client;
+        u8 outbuf[2];
+        int res;
+
+        if (val < 0 || val > 255)
+                return -EINVAL;
+
+        outbuf[0] = channel;
+        outbuf[1] = val;
+
+        res = i2c_master_send(client, outbuf, 2);
+        if (res < 0)
+                return res;
+        else if (res != 2)
+                return -EIO;
+        else
+                return 0;
+}
+
+static int max517_read_raw(struct iio_dev *indio_dev,
+                           struct iio_chan_spec const *chan,
+                           int *val,
+                           int *val2,
+                           long m)
+{
+        struct max517_data *data = iio_priv(indio_dev);
+        unsigned int scale_uv;
+
+        switch (m) {
+        case IIO_CHAN_INFO_SCALE:
+                /* Corresponds to Vref / 2^(bits) */
+                scale_uv = (data->vref_mv[chan->channel] * 1000) >> 8;
+                *val =  scale_uv / 1000000;
+                *val2 = scale_uv % 1000000;
+                return IIO_VAL_INT_PLUS_MICRO;
+        default:
+                break;
+        }
+        return -EINVAL;
+}
+
+static int max517_write_raw(struct iio_dev *indio_dev,
+        struct iio_chan_spec const *chan, int val, int val2, long mask)
+{
+        int ret;
+
+        switch (mask) {
+        case IIO_CHAN_INFO_RAW:
+                ret = max517_set_value(indio_dev, val, chan->channel);
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int max517_suspend(struct device *dev)
+{
+        u8 outbuf = COMMAND_PD;
+
+        return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
+}
+
+static int max517_resume(struct device *dev)
+{
+        u8 outbuf = 0;
+
+        return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
+}
+
+static SIMPLE_DEV_PM_OPS(max517_pm_ops, max517_suspend, max517_resume);
+#define MAX517_PM_OPS (&max517_pm_ops)
+#else
+#define MAX517_PM_OPS NULL
+#endif
+
+static const struct iio_info max517_info = {
+        .read_raw = max517_read_raw,
+        .write_raw = max517_write_raw,
+        .driver_module = THIS_MODULE,
+};
+
+#define MAX517_CHANNEL(chan) {                          \
+        .type = IIO_VOLTAGE,                            \
+        .indexed = 1,                                   \
+        .output = 1,                                    \
+        .channel = (chan),                              \
+        .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |   \
+        IIO_CHAN_INFO_SCALE_SEPARATE_BIT,               \
+        .scan_type = IIO_ST('u', 8, 8, 0),              \
+}
+
+static const struct iio_chan_spec max517_channels[] = {
+        MAX517_CHANNEL(0),
+        MAX517_CHANNEL(1)
+};
+
+static int max517_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+        struct max517_data *data;
+        struct iio_dev *indio_dev;
+        struct max517_platform_data *platform_data = client->dev.platform_data;
+        int err;
+
+        indio_dev = iio_device_alloc(sizeof(*data));
+        if (indio_dev == NULL) {
+                err = -ENOMEM;
+                goto exit;
+        }
+        data = iio_priv(indio_dev);
+        i2c_set_clientdata(client, indio_dev);
+        data->client = client;
+
+        /* establish that the iio_dev is a child of the i2c device */
+        indio_dev->dev.parent = &client->dev;
+
+        /* reduced channel set for MAX517 */
+        if (id->driver_data == ID_MAX517)
+                indio_dev->num_channels = 1;
+        else
+                indio_dev->num_channels = 2;
+        indio_dev->channels = max517_channels;
+        indio_dev->modes = INDIO_DIRECT_MODE;
+        indio_dev->info = &max517_info;
+
+        /*
+         * Reference voltage on MAX518 and default is 5V, else take vref_mv
+         * from platform_data
+         */
+        if (id->driver_data == ID_MAX518 || !platform_data) {
+                data->vref_mv[0] = data->vref_mv[1] = 5000; /* mV */
+        } else {
+                data->vref_mv[0] = platform_data->vref_mv[0];
+                data->vref_mv[1] = platform_data->vref_mv[1];
+        }
+
+        err = iio_device_register(indio_dev);
+        if (err)
+                goto exit_free_device;
+
+        dev_info(&client->dev, "DAC registered\n");
+
+        return 0;
+
+exit_free_device:
+        iio_device_free(indio_dev);
+exit:
+        return err;
+}
+
+static int max517_remove(struct i2c_client *client)
+{
+        iio_device_unregister(i2c_get_clientdata(client));
+        iio_device_free(i2c_get_clientdata(client));
+
+        return 0;
+}
+
+static const struct i2c_device_id max517_id[] = {
+        { "max517", ID_MAX517 },
+        { "max518", ID_MAX518 },
+        { "max519", ID_MAX519 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, max517_id);
+
+static struct i2c_driver max517_driver = {
+        .driver = {
+                .name   = MAX517_DRV_NAME,
+                .pm             = MAX517_PM_OPS,
+        },
+        .probe          = max517_probe,
+        .remove         = max517_remove,
+        .id_table       = max517_id,
+};
+module_i2c_driver(max517_driver);
+
+MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
+MODULE_DESCRIPTION("MAX517/MAX518/MAX519 8-bit DAC");
+MODULE_LICENSE("GPL");