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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 "../ring_generic.h"
23#include "adc.h"
24
25#include "ad7476.h"
26
27static int ad7476_scan_direct(struct ad7476_state *st)
28{
29 int ret;
30
31 ret = spi_sync(st->spi, &st->msg);
32 if (ret)
33 return ret;
34
35 return (st->data[0] << 8) | st->data[1];
36}
37
38static ssize_t ad7476_scan(struct device *dev,
39 struct device_attribute *attr,
40 char *buf)
41{
42 struct iio_dev *dev_info = dev_get_drvdata(dev);
43 struct ad7476_state *st = dev_info->dev_data;
44 int ret;
45
46 mutex_lock(&dev_info->mlock);
47 if (iio_ring_enabled(dev_info))
48 ret = ad7476_scan_from_ring(st);
49 else
50 ret = ad7476_scan_direct(st);
51 mutex_unlock(&dev_info->mlock);
52
53 if (ret < 0)
54 return ret;
55
56 return sprintf(buf, "%d\n", (ret >> st->chip_info->res_shift) &
57 RES_MASK(st->chip_info->bits));
58}
59static IIO_DEV_ATTR_IN_RAW(0, ad7476_scan, 0);
60
61static ssize_t ad7476_show_scale(struct device *dev,
62 struct device_attribute *attr,
63 char *buf)
64{
65
66 struct iio_dev *dev_info = dev_get_drvdata(dev);
67 struct ad7476_state *st = iio_dev_get_devdata(dev_info);
68
69 unsigned int scale_uv = (st->int_vref_mv * 1000) >> st->chip_info->bits;
70
71 return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
72}
73static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad7476_show_scale, NULL, 0);
74
75static ssize_t ad7476_show_name(struct device *dev,
76 struct device_attribute *attr,
77 char *buf)
78{
79 struct iio_dev *dev_info = dev_get_drvdata(dev);
80 struct ad7476_state *st = iio_dev_get_devdata(dev_info);
81
82 return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
83}
84static IIO_DEVICE_ATTR(name, S_IRUGO, ad7476_show_name, NULL, 0);
85
86static struct attribute *ad7476_attributes[] = {
87 &iio_dev_attr_in0_raw.dev_attr.attr,
88 &iio_dev_attr_in_scale.dev_attr.attr,
89 &iio_dev_attr_name.dev_attr.attr,
90 NULL,
91};
92
93static const struct attribute_group ad7476_attribute_group = {
94 .attrs = ad7476_attributes,
95};
96
97static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
98 [ID_AD7466] = {
99 .bits = 12,
100 .storagebits = 16,
101 .res_shift = 0,
102 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
103 },
104 [ID_AD7467] = {
105 .bits = 10,
106 .storagebits = 16,
107 .res_shift = 2,
108 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
109 },
110 [ID_AD7468] = {
111 .bits = 8,
112 .storagebits = 16,
113 .res_shift = 4,
114 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
115 },
116 [ID_AD7475] = {
117 .bits = 12,
118 .storagebits = 16,
119 .res_shift = 0,
120 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
121 },
122 [ID_AD7476] = {
123 .bits = 12,
124 .storagebits = 16,
125 .res_shift = 0,
126 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
127 },
128 [ID_AD7477] = {
129 .bits = 10,
130 .storagebits = 16,
131 .res_shift = 2,
132 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
133 },
134 [ID_AD7478] = {
135 .bits = 8,
136 .storagebits = 16,
137 .res_shift = 4,
138 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
139 },
140 [ID_AD7495] = {
141 .bits = 12,
142 .storagebits = 16,
143 .res_shift = 0,
144 .int_vref_mv = 2500,
145 .sign = IIO_SCAN_EL_TYPE_UNSIGNED,
146 },
147};
148
149static int __devinit ad7476_probe(struct spi_device *spi)
150{
151 struct ad7476_platform_data *pdata = spi->dev.platform_data;
152 struct ad7476_state *st;
153 int ret, voltage_uv = 0;
154
155 st = kzalloc(sizeof(*st), GFP_KERNEL);
156 if (st == NULL) {
157 ret = -ENOMEM;
158 goto error_ret;
159 }
160
161 st->reg = regulator_get(&spi->dev, "vcc");
162 if (!IS_ERR(st->reg)) {
163 ret = regulator_enable(st->reg);
164 if (ret)
165 goto error_put_reg;
166
167 voltage_uv = regulator_get_voltage(st->reg);
168 }
169
170 st->chip_info =
171 &ad7476_chip_info_tbl[spi_get_device_id(spi)->driver_data];
172
173 if (st->chip_info->int_vref_mv)
174 st->int_vref_mv = st->chip_info->int_vref_mv;
175 else if (pdata && pdata->vref_mv)
176 st->int_vref_mv = pdata->vref_mv;
177 else if (voltage_uv)
178 st->int_vref_mv = voltage_uv / 1000;
179 else
180 dev_warn(&spi->dev, "reference voltage unspecified\n");
181
182 spi_set_drvdata(spi, st);
183
184 atomic_set(&st->protect_ring, 0);
185 st->spi = spi;
186
187 st->indio_dev = iio_allocate_device();
188 if (st->indio_dev == NULL) {
189 ret = -ENOMEM;
190 goto error_disable_reg;
191 }
192
193
194 st->indio_dev->dev.parent = &spi->dev;
195 st->indio_dev->attrs = &ad7476_attribute_group;
196 st->indio_dev->dev_data = (void *)(st);
197 st->indio_dev->driver_module = THIS_MODULE;
198 st->indio_dev->modes = INDIO_DIRECT_MODE;
199
200
201
202 st->xfer.rx_buf = &st->data;
203 st->xfer.len = st->chip_info->storagebits / 8;
204
205 spi_message_init(&st->msg);
206 spi_message_add_tail(&st->xfer, &st->msg);
207
208 ret = ad7476_register_ring_funcs_and_init(st->indio_dev);
209 if (ret)
210 goto error_free_device;
211
212 ret = iio_device_register(st->indio_dev);
213 if (ret)
214 goto error_free_device;
215
216 ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
217 if (ret)
218 goto error_cleanup_ring;
219 return 0;
220
221error_cleanup_ring:
222 ad7476_ring_cleanup(st->indio_dev);
223 iio_device_unregister(st->indio_dev);
224error_free_device:
225 iio_free_device(st->indio_dev);
226error_disable_reg:
227 if (!IS_ERR(st->reg))
228 regulator_disable(st->reg);
229error_put_reg:
230 if (!IS_ERR(st->reg))
231 regulator_put(st->reg);
232 kfree(st);
233error_ret:
234 return ret;
235}
236
237static int ad7476_remove(struct spi_device *spi)
238{
239 struct ad7476_state *st = spi_get_drvdata(spi);
240 struct iio_dev *indio_dev = st->indio_dev;
241 iio_ring_buffer_unregister(indio_dev->ring);
242 ad7476_ring_cleanup(indio_dev);
243 iio_device_unregister(indio_dev);
244 if (!IS_ERR(st->reg)) {
245 regulator_disable(st->reg);
246 regulator_put(st->reg);
247 }
248 kfree(st);
249 return 0;
250}
251
252static const struct spi_device_id ad7476_id[] = {
253 {"ad7466", ID_AD7466},
254 {"ad7467", ID_AD7467},
255 {"ad7468", ID_AD7468},
256 {"ad7475", ID_AD7475},
257 {"ad7476", ID_AD7476},
258 {"ad7476a", ID_AD7476},
259 {"ad7477", ID_AD7477},
260 {"ad7477a", ID_AD7477},
261 {"ad7478", ID_AD7478},
262 {"ad7478a", ID_AD7478},
263 {"ad7495", ID_AD7495},
264 {}
265};
266
267static struct spi_driver ad7476_driver = {
268 .driver = {
269 .name = "ad7476",
270 .bus = &spi_bus_type,
271 .owner = THIS_MODULE,
272 },
273 .probe = ad7476_probe,
274 .remove = __devexit_p(ad7476_remove),
275 .id_table = ad7476_id,
276};
277
278static int __init ad7476_init(void)
279{
280 return spi_register_driver(&ad7476_driver);
281}
282module_init(ad7476_init);
283
284static void __exit ad7476_exit(void)
285{
286 spi_unregister_driver(&ad7476_driver);
287}
288module_exit(ad7476_exit);
289
290MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
291MODULE_DESCRIPTION("Analog Devices AD7475/6/7/8(A) AD7466/7/8 ADC");
292MODULE_LICENSE("GPL v2");
293MODULE_ALIAS("spi:ad7476");
294
