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