2 * Driver for ADI Direct Digital Synthesis ad9951
4 * Copyright (c) 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>
17 #include <linux/module.h>
22 #define DRV_NAME "ad9951"
28 #define OSKEN (1 << 1)
29 #define LOAD_ARR (1 << 2)
31 #define AUTO_SYNC (1 << 7)
34 #define SDIO_IPT (1 << 1)
35 #define CLR_PHA (1 << 2)
36 #define SINE_OPT (1 << 4)
37 #define ACLR_PHA (1 << 5)
39 #define VCO_RANGE (1 << 2)
41 #define CRS_OPT (1 << 1)
42 #define HMANU_SYNC (1 << 2)
43 #define HSPD_SYNC (1 << 3)
45 /* Register format: 1 byte addr + value */
46 struct ad9951_config {
55 struct spi_device *sdev;
58 static ssize_t ad9951_set_parameter(struct device *dev,
59 struct device_attribute *attr,
63 struct spi_message msg;
64 struct spi_transfer xfer;
66 struct ad9951_config *config = (struct ad9951_config *)buf;
67 struct iio_dev *idev = dev_get_drvdata(dev);
68 struct ad9951_state *st = iio_priv(idev);
71 xfer.tx_buf = &config->asf[0];
72 mutex_lock(&st->lock);
74 spi_message_init(&msg);
75 spi_message_add_tail(&xfer, &msg);
76 ret = spi_sync(st->sdev, &msg);
81 xfer.tx_buf = &config->arr[0];
83 spi_message_init(&msg);
84 spi_message_add_tail(&xfer, &msg);
85 ret = spi_sync(st->sdev, &msg);
90 xfer.tx_buf = &config->ftw0[0];
92 spi_message_init(&msg);
93 spi_message_add_tail(&xfer, &msg);
94 ret = spi_sync(st->sdev, &msg);
99 xfer.tx_buf = &config->ftw1[0];
101 spi_message_init(&msg);
102 spi_message_add_tail(&xfer, &msg);
103 ret = spi_sync(st->sdev, &msg);
107 mutex_unlock(&st->lock);
109 return ret ? ret : len;
112 static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0);
114 static void ad9951_init(struct ad9951_state *st)
116 struct spi_message msg;
117 struct spi_transfer xfer;
123 cfr[2] = LSB_FST | CLR_PHA | SINE_OPT | ACLR_PHA;
124 cfr[3] = AUTO_OSK | OSKEN | LOAD_ARR;
127 mutex_lock(&st->lock);
132 spi_message_init(&msg);
133 spi_message_add_tail(&xfer, &msg);
134 ret = spi_sync(st->sdev, &msg);
146 spi_message_init(&msg);
147 spi_message_add_tail(&xfer, &msg);
148 ret = spi_sync(st->sdev, &msg);
153 mutex_unlock(&st->lock);
159 static struct attribute *ad9951_attributes[] = {
160 &iio_dev_attr_dds.dev_attr.attr,
164 static const struct attribute_group ad9951_attribute_group = {
165 .attrs = ad9951_attributes,
168 static const struct iio_info ad9951_info = {
169 .attrs = &ad9951_attribute_group,
170 .driver_module = THIS_MODULE,
173 static int __devinit ad9951_probe(struct spi_device *spi)
175 struct ad9951_state *st;
176 struct iio_dev *idev;
179 idev = iio_allocate_device(sizeof(*st));
184 spi_set_drvdata(spi, idev);
186 mutex_init(&st->lock);
189 idev->dev.parent = &spi->dev;
191 idev->info = &ad9951_info;
192 idev->modes = INDIO_DIRECT_MODE;
194 ret = iio_device_register(idev);
197 spi->max_speed_hz = 2000000;
198 spi->mode = SPI_MODE_3;
199 spi->bits_per_word = 8;
205 iio_free_device(idev);
211 static int __devexit ad9951_remove(struct spi_device *spi)
213 iio_device_unregister(spi_get_drvdata(spi));
214 iio_free_device(spi_get_drvdata(spi));
219 static struct spi_driver ad9951_driver = {
222 .owner = THIS_MODULE,
224 .probe = ad9951_probe,
225 .remove = __devexit_p(ad9951_remove),
228 static __init int ad9951_spi_init(void)
230 return spi_register_driver(&ad9951_driver);
232 module_init(ad9951_spi_init);
234 static __exit void ad9951_spi_exit(void)
236 spi_unregister_driver(&ad9951_driver);
238 module_exit(ad9951_spi_exit);
240 MODULE_AUTHOR("Cliff Cai");
241 MODULE_DESCRIPTION("Analog Devices ad9951 driver");
242 MODULE_LICENSE("GPL v2");
243 MODULE_ALIAS("spi:" DRV_NAME);