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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#include <linux/module.h>
18
19#include <linux/iio/iio.h>
20#include <linux/iio/sysfs.h>
21
22#define DRV_NAME "ad9951"
23
24#define CFR1 0x0
25#define CFR2 0x1
26
27#define AUTO_OSK (1)
28#define OSKEN (1 << 1)
29#define LOAD_ARR (1 << 2)
30
31#define AUTO_SYNC (1 << 7)
32
33#define LSB_FST (1)
34#define SDIO_IPT (1 << 1)
35#define CLR_PHA (1 << 2)
36#define SINE_OPT (1 << 4)
37#define ACLR_PHA (1 << 5)
38
39#define VCO_RANGE (1 << 2)
40
41#define CRS_OPT (1 << 1)
42#define HMANU_SYNC (1 << 2)
43#define HSPD_SYNC (1 << 3)
44
45
46struct ad9951_config {
47 u8 asf[3];
48 u8 arr[2];
49 u8 ftw0[5];
50 u8 ftw1[3];
51};
52
53struct ad9951_state {
54 struct mutex lock;
55 struct spi_device *sdev;
56};
57
58static ssize_t ad9951_set_parameter(struct device *dev,
59 struct device_attribute *attr,
60 const char *buf,
61 size_t len)
62{
63 struct spi_message msg;
64 struct spi_transfer xfer;
65 int ret;
66 struct ad9951_config *config = (struct ad9951_config *)buf;
67 struct iio_dev *idev = dev_to_iio_dev(dev);
68 struct ad9951_state *st = iio_priv(idev);
69
70 xfer.len = 3;
71 xfer.tx_buf = &config->asf[0];
72 mutex_lock(&st->lock);
73
74 spi_message_init(&msg);
75 spi_message_add_tail(&xfer, &msg);
76 ret = spi_sync(st->sdev, &msg);
77 if (ret)
78 goto error_ret;
79
80 xfer.len = 2;
81 xfer.tx_buf = &config->arr[0];
82
83 spi_message_init(&msg);
84 spi_message_add_tail(&xfer, &msg);
85 ret = spi_sync(st->sdev, &msg);
86 if (ret)
87 goto error_ret;
88
89 xfer.len = 5;
90 xfer.tx_buf = &config->ftw0[0];
91
92 spi_message_init(&msg);
93 spi_message_add_tail(&xfer, &msg);
94 ret = spi_sync(st->sdev, &msg);
95 if (ret)
96 goto error_ret;
97
98 xfer.len = 3;
99 xfer.tx_buf = &config->ftw1[0];
100
101 spi_message_init(&msg);
102 spi_message_add_tail(&xfer, &msg);
103 ret = spi_sync(st->sdev, &msg);
104 if (ret)
105 goto error_ret;
106error_ret:
107 mutex_unlock(&st->lock);
108
109 return ret ? ret : len;
110}
111
112static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0);
113
114static void ad9951_init(struct ad9951_state *st)
115{
116 struct spi_message msg;
117 struct spi_transfer xfer;
118 int ret;
119 u8 cfr[5];
120
121 cfr[0] = CFR1;
122 cfr[1] = 0;
123 cfr[2] = LSB_FST | CLR_PHA | SINE_OPT | ACLR_PHA;
124 cfr[3] = AUTO_OSK | OSKEN | LOAD_ARR;
125 cfr[4] = 0;
126
127 mutex_lock(&st->lock);
128
129 xfer.len = 5;
130 xfer.tx_buf = 𝔠
131
132 spi_message_init(&msg);
133 spi_message_add_tail(&xfer, &msg);
134 ret = spi_sync(st->sdev, &msg);
135 if (ret)
136 goto error_ret;
137
138 cfr[0] = CFR2;
139 cfr[1] = VCO_RANGE;
140 cfr[2] = HSPD_SYNC;
141 cfr[3] = 0;
142
143 xfer.len = 4;
144 xfer.tx_buf = 𝔠
145
146 spi_message_init(&msg);
147 spi_message_add_tail(&xfer, &msg);
148 ret = spi_sync(st->sdev, &msg);
149 if (ret)
150 goto error_ret;
151
152error_ret:
153 mutex_unlock(&st->lock);
154
155
156
157}
158
159static struct attribute *ad9951_attributes[] = {
160 &iio_dev_attr_dds.dev_attr.attr,
161 NULL,
162};
163
164static const struct attribute_group ad9951_attribute_group = {
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 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_device_alloc(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_device_free(idev);
206
207error_ret:
208 return ret;
209}
210
211static int ad9951_remove(struct spi_device *spi)
212{
213 iio_device_unregister(spi_get_drvdata(spi));
214 iio_device_free(spi_get_drvdata(spi));
215
216 return 0;
217}
218
219static struct spi_driver ad9951_driver = {
220 .driver = {
221 .name = DRV_NAME,
222 .owner = THIS_MODULE,
223 },
224 .probe = ad9951_probe,
225 .remove = ad9951_remove,
226};
227module_spi_driver(ad9951_driver);
228
229MODULE_AUTHOR("Cliff Cai");
230MODULE_DESCRIPTION("Analog Devices ad9951 driver");
231MODULE_LICENSE("GPL v2");
232MODULE_ALIAS("spi:" DRV_NAME);
233
