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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
18#include "../iio.h"
19#include "../sysfs.h"
20
21#define DRV_NAME "ad9951"
22
23#define CFR1 0x0
24#define CFR2 0x1
25
26#define AUTO_OSK (1)
27#define OSKEN (1 << 1)
28#define LOAD_ARR (1 << 2)
29
30#define AUTO_SYNC (1 << 7)
31
32#define LSB_FST (1)
33#define SDIO_IPT (1 << 1)
34#define CLR_PHA (1 << 2)
35#define SINE_OPT (1 << 4)
36#define ACLR_PHA (1 << 5)
37
38#define VCO_RANGE (1 << 2)
39
40#define CRS_OPT (1 << 1)
41#define HMANU_SYNC (1 << 2)
42#define HSPD_SYNC (1 << 3)
43
44
45struct ad9951_config {
46 u8 asf[3];
47 u8 arr[2];
48 u8 ftw0[5];
49 u8 ftw1[3];
50};
51
52struct ad9951_state {
53 struct mutex lock;
54 struct spi_device *sdev;
55};
56
57static ssize_t ad9951_set_parameter(struct device *dev,
58 struct device_attribute *attr,
59 const char *buf,
60 size_t len)
61{
62 struct spi_message msg;
63 struct spi_transfer xfer;
64 int ret;
65 struct ad9951_config *config = (struct ad9951_config *)buf;
66 struct iio_dev *idev = dev_get_drvdata(dev);
67 struct ad9951_state *st = iio_priv(idev);
68
69 xfer.len = 3;
70 xfer.tx_buf = &config->asf[0];
71 mutex_lock(&st->lock);
72
73 spi_message_init(&msg);
74 spi_message_add_tail(&xfer, &msg);
75 ret = spi_sync(st->sdev, &msg);
76 if (ret)
77 goto error_ret;
78
79 xfer.len = 2;
80 xfer.tx_buf = &config->arr[0];
81
82 spi_message_init(&msg);
83 spi_message_add_tail(&xfer, &msg);
84 ret = spi_sync(st->sdev, &msg);
85 if (ret)
86 goto error_ret;
87
88 xfer.len = 5;
89 xfer.tx_buf = &config->ftw0[0];
90
91 spi_message_init(&msg);
92 spi_message_add_tail(&xfer, &msg);
93 ret = spi_sync(st->sdev, &msg);
94 if (ret)
95 goto error_ret;
96
97 xfer.len = 3;
98 xfer.tx_buf = &config->ftw1[0];
99
100 spi_message_init(&msg);
101 spi_message_add_tail(&xfer, &msg);
102 ret = spi_sync(st->sdev, &msg);
103 if (ret)
104 goto error_ret;
105error_ret:
106 mutex_unlock(&st->lock);
107
108 return ret ? ret : len;
109}
110
111static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0);
112
113static void ad9951_init(struct ad9951_state *st)
114{
115 struct spi_message msg;
116 struct spi_transfer xfer;
117 int ret;
118 u8 cfr[5];
119
120 cfr[0] = CFR1;
121 cfr[1] = 0;
122 cfr[2] = LSB_FST | CLR_PHA | SINE_OPT | ACLR_PHA;
123 cfr[3] = AUTO_OSK | OSKEN | LOAD_ARR;
124 cfr[4] = 0;
125
126 mutex_lock(&st->lock);
127
128 xfer.len = 5;
129 xfer.tx_buf = 𝔠
130
131 spi_message_init(&msg);
132 spi_message_add_tail(&xfer, &msg);
133 ret = spi_sync(st->sdev, &msg);
134 if (ret)
135 goto error_ret;
136
137 cfr[0] = CFR2;
138 cfr[1] = VCO_RANGE;
139 cfr[2] = HSPD_SYNC;
140 cfr[3] = 0;
141
142 xfer.len = 4;
143 xfer.tx_buf = 𝔠
144
145 spi_message_init(&msg);
146 spi_message_add_tail(&xfer, &msg);
147 ret = spi_sync(st->sdev, &msg);
148 if (ret)
149 goto error_ret;
150
151error_ret:
152 mutex_unlock(&st->lock);
153
154
155
156}
157
158static struct attribute *ad9951_attributes[] = {
159 &iio_dev_attr_dds.dev_attr.attr,
160 NULL,
161};
162
163static const struct attribute_group ad9951_attribute_group = {
164 .name = DRV_NAME,
165 .attrs = ad9951_attributes,
166};
167
168static const struct iio_info ad9951_info = {
169 .attrs = &ad9951_attribute_group,
170 .driver_module = THIS_MODULE,
171};
172
173static int __devinit ad9951_probe(struct spi_device *spi)
174{
175 struct ad9951_state *st;
176 struct iio_dev *idev;
177 int ret = 0;
178
179 idev = iio_allocate_device(sizeof(*st));
180 if (idev == NULL) {
181 ret = -ENOMEM;
182 goto error_ret;
183 }
184 spi_set_drvdata(spi, idev);
185 st = iio_priv(idev);
186 mutex_init(&st->lock);
187 st->sdev = spi;
188
189 idev->dev.parent = &spi->dev;
190
191 idev->info = &ad9951_info;
192 idev->modes = INDIO_DIRECT_MODE;
193
194 ret = iio_device_register(idev);
195 if (ret)
196 goto error_free_dev;
197 spi->max_speed_hz = 2000000;
198 spi->mode = SPI_MODE_3;
199 spi->bits_per_word = 8;
200 spi_setup(spi);
201 ad9951_init(st);
202 return 0;
203
204error_free_dev:
205 iio_free_device(idev);
206
207error_ret:
208 return ret;
209}
210
211static int __devexit ad9951_remove(struct spi_device *spi)
212{
213 iio_device_unregister(spi_get_drvdata(spi));
214
215 return 0;
216}
217
218static struct spi_driver ad9951_driver = {
219 .driver = {
220 .name = DRV_NAME,
221 .owner = THIS_MODULE,
222 },
223 .probe = ad9951_probe,
224 .remove = __devexit_p(ad9951_remove),
225};
226
227static __init int ad9951_spi_init(void)
228{
229 return spi_register_driver(&ad9951_driver);
230}
231module_init(ad9951_spi_init);
232
233static __exit void ad9951_spi_exit(void)
234{
235 spi_unregister_driver(&ad9951_driver);
236}
237module_exit(ad9951_spi_exit);
238
239MODULE_AUTHOR("Cliff Cai");
240MODULE_DESCRIPTION("Analog Devices ad9951 driver");
241MODULE_LICENSE("GPL v2");
242
