138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
/*
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* Driver for ADI Direct Digital Synthesis ad9850
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*
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* Copyright (c) 2010-2010 Analog Devices Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define DRV_NAME "ad9850"
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#define value_mask (u16)0xf000
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#define addr_shift 12
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/* Register format: 4 bits addr + 12 bits value */
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struct ad9850_config {
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u8 control[5];
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};
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struct ad9850_state {
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struct mutex lock;
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struct spi_device *sdev;
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};
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static ssize_t ad9850_set_parameter(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct spi_message msg;
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struct spi_transfer xfer;
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int ret;
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struct ad9850_config *config = (struct ad9850_config *)buf;
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struct iio_dev *idev = dev_to_iio_dev(dev);
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struct ad9850_state *st = iio_priv(idev);
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xfer.len = len;
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xfer.tx_buf = config;
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mutex_lock(&st->lock);
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spi_message_init(&msg);
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spi_message_add_tail(&xfer, &msg);
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ret = spi_sync(st->sdev, &msg);
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if (ret)
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goto error_ret;
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error_ret:
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mutex_unlock(&st->lock);
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return ret ? ret : len;
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}
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static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9850_set_parameter, 0);
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static struct attribute *ad9850_attributes[] = {
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&iio_dev_attr_dds.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ad9850_attribute_group = {
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.attrs = ad9850_attributes,
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};
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static const struct iio_info ad9850_info = {
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.attrs = &ad9850_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int __devinit ad9850_probe(struct spi_device *spi)
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{
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struct ad9850_state *st;
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struct iio_dev *idev;
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int ret = 0;
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idev = iio_device_alloc(sizeof(*st));
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if (idev == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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spi_set_drvdata(spi, idev);
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st = iio_priv(idev);
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mutex_init(&st->lock);
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st->sdev = spi;
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idev->dev.parent = &spi->dev;
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idev->info = &ad9850_info;
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idev->modes = INDIO_DIRECT_MODE;
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ret = iio_device_register(idev);
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if (ret)
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goto error_free_dev;
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spi->max_speed_hz = 2000000;
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spi->mode = SPI_MODE_3;
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spi->bits_per_word = 16;
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spi_setup(spi);
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return 0;
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error_free_dev:
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iio_device_free(idev);
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error_ret:
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return ret;
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}
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static int __devexit ad9850_remove(struct spi_device *spi)
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{
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iio_device_unregister(spi_get_drvdata(spi));
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iio_device_free(spi_get_drvdata(spi));
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return 0;
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}
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static struct spi_driver ad9850_driver = {
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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.probe = ad9850_probe,
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.remove = __devexit_p(ad9850_remove),
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};
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module_spi_driver(ad9850_driver);
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MODULE_AUTHOR("Cliff Cai");
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MODULE_DESCRIPTION("Analog Devices ad9850 driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("spi:" DRV_NAME);
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