1 files changed, 159 insertions, 0 deletions

diff --git a/drivers/staging/iio/dds/ad5930.c b/drivers/staging/iio/dds/ad5930.c
new file mode 100644
index 00000000000..0b2aa4cafdd
--- /dev/null
+++ b/drivers/staging/iio/dds/ad5930.c
@@ -0,0 +1,159 @@
+/*
+ * Driver for ADI Direct Digital Synthesis ad5930
+ *
+ * Copyright (c) 2010-2010 Analog Devices Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+#define DRV_NAME "ad5930"
+
+#define value_mask (u16)0xf000
+#define addr_shift 12
+
+/* Register format: 4 bits addr + 12 bits value */
+struct ad5903_config {
+        u16 control;
+        u16 incnum;
+        u16 frqdelt[2];
+        u16 incitvl;
+        u16 buritvl;
+        u16 strtfrq[2];
+};
+
+struct ad5930_state {
+        struct mutex lock;
+        struct spi_device *sdev;
+};
+
+static ssize_t ad5930_set_parameter(struct device *dev,
+                                        struct device_attribute *attr,
+                                        const char *buf,
+                                        size_t len)
+{
+        struct spi_message msg;
+        struct spi_transfer xfer;
+        int ret;
+        struct ad5903_config *config = (struct ad5903_config *)buf;
+        struct iio_dev *idev = dev_get_drvdata(dev);
+        struct ad5930_state *st = iio_priv(idev);
+
+        config->control = (config->control & ~value_mask);
+        config->incnum = (config->control & ~value_mask) | (1 << addr_shift);
+        config->frqdelt[0] = (config->control & ~value_mask) | (2 << addr_shift);
+        config->frqdelt[1] = (config->control & ~value_mask) | 3 << addr_shift;
+        config->incitvl = (config->control & ~value_mask) | 4 << addr_shift;
+        config->buritvl = (config->control & ~value_mask) | 8 << addr_shift;
+        config->strtfrq[0] = (config->control & ~value_mask) | 0xc << addr_shift;
+        config->strtfrq[1] = (config->control & ~value_mask) | 0xd << addr_shift;
+
+        xfer.len = len;
+        xfer.tx_buf = config;
+        mutex_lock(&st->lock);
+
+        spi_message_init(&msg);
+        spi_message_add_tail(&xfer, &msg);
+        ret = spi_sync(st->sdev, &msg);
+        if (ret)
+                goto error_ret;
+error_ret:
+        mutex_unlock(&st->lock);
+
+        return ret ? ret : len;
+}
+
+static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad5930_set_parameter, 0);
+
+static struct attribute *ad5930_attributes[] = {
+        &iio_dev_attr_dds.dev_attr.attr,
+        NULL,
+};
+
+static const struct attribute_group ad5930_attribute_group = {
+        .attrs = ad5930_attributes,
+};
+
+static const struct iio_info ad5930_info = {
+        .attrs = &ad5930_attribute_group,
+        .driver_module = THIS_MODULE,
+};
+
+static int __devinit ad5930_probe(struct spi_device *spi)
+{
+        struct ad5930_state *st;
+        struct iio_dev *idev;
+        int ret = 0;
+
+        idev = iio_allocate_device(sizeof(*st));
+        if (idev == NULL) {
+                ret = -ENOMEM;
+                goto error_ret;
+        }
+        spi_set_drvdata(spi, idev);
+        st = iio_priv(idev);
+
+        mutex_init(&st->lock);
+        st->sdev = spi;
+        idev->dev.parent = &spi->dev;
+        idev->info = &ad5930_info;
+        idev->modes = INDIO_DIRECT_MODE;
+
+        ret = iio_device_register(idev);
+        if (ret)
+                goto error_free_dev;
+        spi->max_speed_hz = 2000000;
+        spi->mode = SPI_MODE_3;
+        spi->bits_per_word = 16;
+        spi_setup(spi);
+
+        return 0;
+
+error_free_dev:
+        iio_free_device(idev);
+error_ret:
+        return ret;
+}
+
+static int __devexit ad5930_remove(struct spi_device *spi)
+{
+        iio_device_unregister(spi_get_drvdata(spi));
+
+        return 0;
+}
+
+static struct spi_driver ad5930_driver = {
+        .driver = {
+                .name = DRV_NAME,
+                .owner = THIS_MODULE,
+        },
+        .probe = ad5930_probe,
+        .remove = __devexit_p(ad5930_remove),
+};
+
+static __init int ad5930_spi_init(void)
+{
+        return spi_register_driver(&ad5930_driver);
+}
+module_init(ad5930_spi_init);
+
+static __exit void ad5930_spi_exit(void)
+{
+        spi_unregister_driver(&ad5930_driver);
+}
+module_exit(ad5930_spi_exit);
+
+MODULE_AUTHOR("Cliff Cai");
+MODULE_DESCRIPTION("Analog Devices ad5930 driver");
+MODULE_LICENSE("GPL v2");