2 * Driver for ADI Direct Digital Synthesis ad5930
4 * Copyright (c) 2010-2010 Analog Devices Inc.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/types.h>
12 #include <linux/mutex.h>
13 #include <linux/device.h>
14 #include <linux/spi/spi.h>
15 #include <linux/slab.h>
16 #include <linux/sysfs.h>
21 #define DRV_NAME "ad5930"
23 #define value_mask (u16)0xf000
26 /* Register format: 4 bits addr + 12 bits value */
27 struct ad5903_config {
39 struct spi_device *sdev;
42 static ssize_t ad5930_set_parameter(struct device *dev,
43 struct device_attribute *attr,
47 struct spi_message msg;
48 struct spi_transfer xfer;
50 struct ad5903_config *config = (struct ad5903_config *)buf;
51 struct iio_dev *idev = dev_get_drvdata(dev);
52 struct ad5930_state *st = idev->dev_data;
54 config->control = (config->control & ~value_mask);
55 config->incnum = (config->control & ~value_mask) | (1 << addr_shift);
56 config->frqdelt[0] = (config->control & ~value_mask) | (2 << addr_shift);
57 config->frqdelt[1] = (config->control & ~value_mask) | 3 << addr_shift;
58 config->incitvl = (config->control & ~value_mask) | 4 << addr_shift;
59 config->buritvl = (config->control & ~value_mask) | 8 << addr_shift;
60 config->strtfrq[0] = (config->control & ~value_mask) | 0xc << addr_shift;
61 config->strtfrq[1] = (config->control & ~value_mask) | 0xd << addr_shift;
65 mutex_lock(&st->lock);
67 spi_message_init(&msg);
68 spi_message_add_tail(&xfer, &msg);
69 ret = spi_sync(st->sdev, &msg);
73 mutex_unlock(&st->lock);
75 return ret ? ret : len;
78 static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad5930_set_parameter, 0);
80 static struct attribute *ad5930_attributes[] = {
81 &iio_dev_attr_dds.dev_attr.attr,
85 static const struct attribute_group ad5930_attribute_group = {
87 .attrs = ad5930_attributes,
90 static int __devinit ad5930_probe(struct spi_device *spi)
92 struct ad5930_state *st;
95 st = kzalloc(sizeof(*st), GFP_KERNEL);
100 spi_set_drvdata(spi, st);
102 mutex_init(&st->lock);
105 st->idev = iio_allocate_device();
106 if (st->idev == NULL) {
110 st->idev->dev.parent = &spi->dev;
111 st->idev->num_interrupt_lines = 0;
112 st->idev->event_attrs = NULL;
114 st->idev->attrs = &ad5930_attribute_group;
115 st->idev->dev_data = (void *)(st);
116 st->idev->driver_module = THIS_MODULE;
117 st->idev->modes = INDIO_DIRECT_MODE;
119 ret = iio_device_register(st->idev);
122 spi->max_speed_hz = 2000000;
123 spi->mode = SPI_MODE_3;
124 spi->bits_per_word = 16;
130 iio_free_device(st->idev);
137 static int __devexit ad5930_remove(struct spi_device *spi)
139 struct ad5930_state *st = spi_get_drvdata(spi);
141 iio_device_unregister(st->idev);
147 static struct spi_driver ad5930_driver = {
150 .owner = THIS_MODULE,
152 .probe = ad5930_probe,
153 .remove = __devexit_p(ad5930_remove),
156 static __init int ad5930_spi_init(void)
158 return spi_register_driver(&ad5930_driver);
160 module_init(ad5930_spi_init);
162 static __exit void ad5930_spi_exit(void)
164 spi_unregister_driver(&ad5930_driver);
166 module_exit(ad5930_spi_exit);
168 MODULE_AUTHOR("Cliff Cai");
169 MODULE_DESCRIPTION("Analog Devices ad5930 driver");
170 MODULE_LICENSE("GPL v2");