1 /*
2 * Driver for ADI Direct Digital Synthesis ad9951
3 *
4 * Copyright (c) 2010 Analog Devices Inc.
5 *
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.
9 *
10 */
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 /* Register format: 1 byte addr + value */
45 struct ad9951_config {
46 u8 asf[3];
47 u8 arr[2];
48 u8 ftw0[5];
49 u8 ftw1[3];
50 };
51
52 struct ad9951_state {
53 struct mutex lock;
54 struct iio_dev *idev;
55 struct spi_device *sdev;
56 };
57
ad9951_set_parameter(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)58 static 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_get_drvdata(dev);
68 struct ad9951_state *st = idev->dev_data;
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;
106 error_ret:
107 mutex_unlock(&st->lock);
108
109 return ret ? ret : len;
110 }
111
112 static IIO_DEVICE_ATTR(dds, S_IWUSR, NULL, ad9951_set_parameter, 0);
113
ad9951_init(struct ad9951_state * st)114 static 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
152 error_ret:
153 mutex_unlock(&st->lock);
154
155
156
157 }
158
159 static struct attribute *ad9951_attributes[] = {
160 &iio_dev_attr_dds.dev_attr.attr,
161 NULL,
162 };
163
164 static const struct attribute_group ad9951_attribute_group = {
165 .name = DRV_NAME,
166 .attrs = ad9951_attributes,
167 };
168
ad9951_probe(struct spi_device * spi)169 static int __devinit ad9951_probe(struct spi_device *spi)
170 {
171 struct ad9951_state *st;
172 int ret = 0;
173
174 st = kzalloc(sizeof(*st), GFP_KERNEL);
175 if (st == NULL) {
176 ret = -ENOMEM;
177 goto error_ret;
178 }
179 spi_set_drvdata(spi, st);
180
181 mutex_init(&st->lock);
182 st->sdev = spi;
183
184 st->idev = iio_allocate_device();
185 if (st->idev == NULL) {
186 ret = -ENOMEM;
187 goto error_free_st;
188 }
189 st->idev->dev.parent = &spi->dev;
190 st->idev->num_interrupt_lines = 0;
191 st->idev->event_attrs = NULL;
192
193 st->idev->attrs = &ad9951_attribute_group;
194 st->idev->dev_data = (void *)(st);
195 st->idev->driver_module = THIS_MODULE;
196 st->idev->modes = INDIO_DIRECT_MODE;
197
198 ret = iio_device_register(st->idev);
199 if (ret)
200 goto error_free_dev;
201 spi->max_speed_hz = 2000000;
202 spi->mode = SPI_MODE_3;
203 spi->bits_per_word = 8;
204 spi_setup(spi);
205 ad9951_init(st);
206 return 0;
207
208 error_free_dev:
209 iio_free_device(st->idev);
210 error_free_st:
211 kfree(st);
212 error_ret:
213 return ret;
214 }
215
ad9951_remove(struct spi_device * spi)216 static int __devexit ad9951_remove(struct spi_device *spi)
217 {
218 struct ad9951_state *st = spi_get_drvdata(spi);
219
220 iio_device_unregister(st->idev);
221 kfree(st);
222
223 return 0;
224 }
225
226 static struct spi_driver ad9951_driver = {
227 .driver = {
228 .name = DRV_NAME,
229 .owner = THIS_MODULE,
230 },
231 .probe = ad9951_probe,
232 .remove = __devexit_p(ad9951_remove),
233 };
234
ad9951_spi_init(void)235 static __init int ad9951_spi_init(void)
236 {
237 return spi_register_driver(&ad9951_driver);
238 }
239 module_init(ad9951_spi_init);
240
ad9951_spi_exit(void)241 static __exit void ad9951_spi_exit(void)
242 {
243 spi_unregister_driver(&ad9951_driver);
244 }
245 module_exit(ad9951_spi_exit);
246
247 MODULE_AUTHOR("Cliff Cai");
248 MODULE_DESCRIPTION("Analog Devices ad9951 driver");
249 MODULE_LICENSE("GPL v2");
250