Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / drivers / staging / iio / dds / ad9850.c

diff --git a/drivers/staging/iio/dds/ad9850.c b/drivers/staging/iio/dds/ad9850.c
new file mode 100644 (file)
index 0000000..b259bfe
--- /dev/null
+++ b/drivers/staging/iio/dds/ad9850.c
@@ -0,0 +1,156 @@
+/*
+ * Driver for ADI Direct Digital Synthesis ad9850
+ *
+ * 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 "ad9850"
+
+#define value_mask (u16)0xf000
+#define addr_shift 12
+
+/* Register format: 4 bits addr + 12 bits value */
+struct ad9850_config {
+       u8 control[5];
+};
+
+struct ad9850_state {
+       struct mutex lock;
+       struct iio_dev *idev;
+       struct spi_device *sdev;
+};
+
+static ssize_t ad9850_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 ad9850_config *config = (struct ad9850_config *)buf;
+       struct iio_dev *idev = dev_get_drvdata(dev);
+       struct ad9850_state *st = idev->dev_data;
+
+       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, ad9850_set_parameter, 0);
+
+static struct attribute *ad9850_attributes[] = {
+       &iio_dev_attr_dds.dev_attr.attr,
+       NULL,
+};
+
+static const struct attribute_group ad9850_attribute_group = {
+       .name = DRV_NAME,
+       .attrs = ad9850_attributes,
+};
+
+static int __devinit ad9850_probe(struct spi_device *spi)
+{
+       struct ad9850_state *st;
+       int ret = 0;
+
+       st = kzalloc(sizeof(*st), GFP_KERNEL);
+       if (st == NULL) {
+               ret = -ENOMEM;
+               goto error_ret;
+       }
+       spi_set_drvdata(spi, st);
+
+       mutex_init(&st->lock);
+       st->sdev = spi;
+
+       st->idev = iio_allocate_device();
+       if (st->idev == NULL) {
+               ret = -ENOMEM;
+               goto error_free_st;
+       }
+       st->idev->dev.parent = &spi->dev;
+       st->idev->num_interrupt_lines = 0;
+       st->idev->event_attrs = NULL;
+
+       st->idev->attrs = &ad9850_attribute_group;
+       st->idev->dev_data = (void *)(st);
+       st->idev->driver_module = THIS_MODULE;
+       st->idev->modes = INDIO_DIRECT_MODE;
+
+       ret = iio_device_register(st->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(st->idev);
+error_free_st:
+       kfree(st);
+error_ret:
+       return ret;
+}
+
+static int __devexit ad9850_remove(struct spi_device *spi)
+{
+       struct ad9850_state *st = spi_get_drvdata(spi);
+
+       iio_device_unregister(st->idev);
+       kfree(st);
+
+       return 0;
+}
+
+static struct spi_driver ad9850_driver = {
+       .driver = {
+               .name = DRV_NAME,
+               .owner = THIS_MODULE,
+       },
+       .probe = ad9850_probe,
+       .remove = __devexit_p(ad9850_remove),
+};
+
+static __init int ad9850_spi_init(void)
+{
+       return spi_register_driver(&ad9850_driver);
+}
+module_init(ad9850_spi_init);
+
+static __exit void ad9850_spi_exit(void)
+{
+       spi_unregister_driver(&ad9850_driver);
+}
+module_exit(ad9850_spi_exit);
+
+MODULE_AUTHOR("Cliff Cai");
+MODULE_DESCRIPTION("Analog Devices ad9850 driver");
+MODULE_LICENSE("GPL v2");