1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
|
/*
* AD5446 SPI DAC driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include "../iio.h"
#include "../sysfs.h"
#include "dac.h"
#include "ad5446.h"
static void ad5446_store_sample(struct ad5446_state *st, unsigned val)
{
st->data.d16 = cpu_to_be16(AD5446_LOAD |
(val << st->chip_info->left_shift));
}
static void ad5542_store_sample(struct ad5446_state *st, unsigned val)
{
st->data.d16 = cpu_to_be16(val << st->chip_info->left_shift);
}
static void ad5620_store_sample(struct ad5446_state *st, unsigned val)
{
st->data.d16 = cpu_to_be16(AD5620_LOAD |
(val << st->chip_info->left_shift));
}
static void ad5660_store_sample(struct ad5446_state *st, unsigned val)
{
val |= AD5660_LOAD;
st->data.d24[0] = (val >> 16) & 0xFF;
st->data.d24[1] = (val >> 8) & 0xFF;
st->data.d24[2] = val & 0xFF;
}
static ssize_t ad5446_write(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad5446_state *st = dev_info->dev_data;
int ret;
long val;
ret = strict_strtol(buf, 10, &val);
if (ret)
goto error_ret;
if (val > RES_MASK(st->chip_info->bits)) {
ret = -EINVAL;
goto error_ret;
}
mutex_lock(&dev_info->mlock);
st->chip_info->store_sample(st, val);
ret = spi_sync(st->spi, &st->msg);
mutex_unlock(&dev_info->mlock);
error_ret:
return ret ? ret : len;
}
static IIO_DEV_ATTR_OUT_RAW(0, ad5446_write, 0);
static ssize_t ad5446_show_scale(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad5446_state *st = iio_dev_get_devdata(dev_info);
/* Corresponds to Vref / 2^(bits) */
unsigned int scale_uv = (st->vref_mv * 1000) >> st->chip_info->bits;
return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
}
static IIO_DEVICE_ATTR(out_scale, S_IRUGO, ad5446_show_scale, NULL, 0);
static ssize_t ad5446_show_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad5446_state *st = iio_dev_get_devdata(dev_info);
return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
}
static IIO_DEVICE_ATTR(name, S_IRUGO, ad5446_show_name, NULL, 0);
static struct attribute *ad5446_attributes[] = {
&iio_dev_attr_out0_raw.dev_attr.attr,
&iio_dev_attr_out_scale.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
NULL,
};
static const struct attribute_group ad5446_attribute_group = {
.attrs = ad5446_attributes,
};
static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
[ID_AD5444] = {
.bits = 12,
.storagebits = 16,
.left_shift = 2,
.store_sample = ad5446_store_sample,
},
[ID_AD5446] = {
.bits = 14,
.storagebits = 16,
.left_shift = 0,
.store_sample = ad5446_store_sample,
},
[ID_AD5542A] = {
.bits = 16,
.storagebits = 16,
.left_shift = 0,
.store_sample = ad5542_store_sample,
},
[ID_AD5543] = {
.bits = 16,
.storagebits = 16,
.left_shift = 0,
.store_sample = ad5542_store_sample,
},
[ID_AD5512A] = {
.bits = 12,
.storagebits = 16,
.left_shift = 4,
.store_sample = ad5542_store_sample,
},
[ID_AD5553] = {
.bits = 14,
.storagebits = 16,
.left_shift = 0,
.store_sample = ad5542_store_sample,
},
[ID_AD5620_2500] = {
.bits = 12,
.storagebits = 16,
.left_shift = 2,
.int_vref_mv = 2500,
.store_sample = ad5620_store_sample,
},
[ID_AD5620_1250] = {
.bits = 12,
.storagebits = 16,
.left_shift = 2,
.int_vref_mv = 1250,
.store_sample = ad5620_store_sample,
},
[ID_AD5640_2500] = {
.bits = 14,
.storagebits = 16,
.left_shift = 0,
.int_vref_mv = 2500,
.store_sample = ad5620_store_sample,
},
[ID_AD5640_1250] = {
.bits = 14,
.storagebits = 16,
.left_shift = 0,
.int_vref_mv = 1250,
.store_sample = ad5620_store_sample,
},
[ID_AD5660_2500] = {
.bits = 16,
.storagebits = 24,
.left_shift = 0,
.int_vref_mv = 2500,
.store_sample = ad5660_store_sample,
},
[ID_AD5660_1250] = {
.bits = 16,
.storagebits = 24,
.left_shift = 0,
.int_vref_mv = 1250,
.store_sample = ad5660_store_sample,
},
};
static int __devinit ad5446_probe(struct spi_device *spi)
{
struct ad5446_state *st;
int ret, voltage_uv = 0;
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto error_ret;
}
st->reg = regulator_get(&spi->dev, "vcc");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
goto error_put_reg;
voltage_uv = regulator_get_voltage(st->reg);
}
st->chip_info =
&ad5446_chip_info_tbl[spi_get_device_id(spi)->driver_data];
spi_set_drvdata(spi, st);
st->spi = spi;
st->indio_dev = iio_allocate_device();
if (st->indio_dev == NULL) {
ret = -ENOMEM;
goto error_disable_reg;
}
/* Estabilish that the iio_dev is a child of the spi device */
st->indio_dev->dev.parent = &spi->dev;
st->indio_dev->attrs = &ad5446_attribute_group;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->driver_module = THIS_MODULE;
st->indio_dev->modes = INDIO_DIRECT_MODE;
/* Setup default message */
st->xfer.tx_buf = &st->data;
st->xfer.len = st->chip_info->storagebits / 8;
spi_message_init(&st->msg);
spi_message_add_tail(&st->xfer, &st->msg);
switch (spi_get_device_id(spi)->driver_data) {
case ID_AD5620_2500:
case ID_AD5620_1250:
case ID_AD5640_2500:
case ID_AD5640_1250:
case ID_AD5660_2500:
case ID_AD5660_1250:
st->vref_mv = st->chip_info->int_vref_mv;
break;
default:
if (voltage_uv)
st->vref_mv = voltage_uv / 1000;
else
dev_warn(&spi->dev,
"reference voltage unspecified\n");
}
ret = iio_device_register(st->indio_dev);
if (ret)
goto error_free_device;
return 0;
error_free_device:
iio_free_device(st->indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
error_put_reg:
if (!IS_ERR(st->reg))
regulator_put(st->reg);
kfree(st);
error_ret:
return ret;
}
static int ad5446_remove(struct spi_device *spi)
{
struct ad5446_state *st = spi_get_drvdata(spi);
struct iio_dev *indio_dev = st->indio_dev;
iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg)) {
regulator_disable(st->reg);
regulator_put(st->reg);
}
kfree(st);
return 0;
}
static const struct spi_device_id ad5446_id[] = {
{"ad5444", ID_AD5444},
{"ad5446", ID_AD5446},
{"ad5512a", ID_AD5512A},
{"ad5542a", ID_AD5542A},
{"ad5543", ID_AD5543},
{"ad5553", ID_AD5553},
{"ad5620-2500", ID_AD5620_2500}, /* AD5620/40/60: */
{"ad5620-1250", ID_AD5620_1250}, /* part numbers may look differently */
{"ad5640-2500", ID_AD5640_2500},
{"ad5640-1250", ID_AD5640_1250},
{"ad5660-2500", ID_AD5660_2500},
{"ad5660-1250", ID_AD5660_1250},
{}
};
static struct spi_driver ad5446_driver = {
.driver = {
.name = "ad5446",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ad5446_probe,
.remove = __devexit_p(ad5446_remove),
.id_table = ad5446_id,
};
static int __init ad5446_init(void)
{
return spi_register_driver(&ad5446_driver);
}
module_init(ad5446_init);
static void __exit ad5446_exit(void)
{
spi_unregister_driver(&ad5446_driver);
}
module_exit(ad5446_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5444/AD5446 DAC");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:ad5446");
|