Commit | Line | Data |
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88bc3054 MH |
1 | /* |
2 | * AD7792/AD7793 SPI ADC driver | |
3 | * | |
f316983f | 4 | * Copyright 2011-2012 Analog Devices Inc. |
88bc3054 MH |
5 | * |
6 | * Licensed under the GPL-2. | |
7 | */ | |
8 | ||
9 | #include <linux/interrupt.h> | |
10 | #include <linux/device.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/sysfs.h> | |
14 | #include <linux/spi/spi.h> | |
15 | #include <linux/regulator/consumer.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/delay.h> | |
45296236 | 19 | #include <linux/module.h> |
88bc3054 | 20 | |
06458e27 JC |
21 | #include <linux/iio/iio.h> |
22 | #include <linux/iio/sysfs.h> | |
23 | #include <linux/iio/buffer.h> | |
06458e27 JC |
24 | #include <linux/iio/trigger.h> |
25 | #include <linux/iio/trigger_consumer.h> | |
82796edc | 26 | #include <linux/iio/triggered_buffer.h> |
88bc3054 MH |
27 | |
28 | #include "ad7793.h" | |
29 | ||
30 | /* NOTE: | |
31 | * The AD7792/AD7793 features a dual use data out ready DOUT/RDY output. | |
32 | * In order to avoid contentions on the SPI bus, it's therefore necessary | |
33 | * to use spi bus locking. | |
34 | * | |
35 | * The DOUT/RDY output must also be wired to an interrupt capable GPIO. | |
36 | */ | |
37 | ||
38 | struct ad7793_chip_info { | |
39 | struct iio_chan_spec channel[7]; | |
40 | }; | |
41 | ||
42 | struct ad7793_state { | |
43 | struct spi_device *spi; | |
44 | struct iio_trigger *trig; | |
45 | const struct ad7793_chip_info *chip_info; | |
46 | struct regulator *reg; | |
47 | struct ad7793_platform_data *pdata; | |
48 | wait_queue_head_t wq_data_avail; | |
49 | bool done; | |
50 | bool irq_dis; | |
51 | u16 int_vref_mv; | |
52 | u16 mode; | |
53 | u16 conf; | |
54 | u32 scale_avail[8][2]; | |
8c2c6ba6 | 55 | |
88bc3054 MH |
56 | /* |
57 | * DMA (thus cache coherency maintenance) requires the | |
58 | * transfer buffers to live in their own cache lines. | |
59 | */ | |
60 | u8 data[4] ____cacheline_aligned; | |
61 | }; | |
62 | ||
63 | enum ad7793_supported_device_ids { | |
64 | ID_AD7792, | |
65 | ID_AD7793, | |
66 | }; | |
67 | ||
68 | static int __ad7793_write_reg(struct ad7793_state *st, bool locked, | |
69 | bool cs_change, unsigned char reg, | |
70 | unsigned size, unsigned val) | |
71 | { | |
72 | u8 *data = st->data; | |
73 | struct spi_transfer t = { | |
74 | .tx_buf = data, | |
75 | .len = size + 1, | |
76 | .cs_change = cs_change, | |
77 | }; | |
78 | struct spi_message m; | |
79 | ||
80 | data[0] = AD7793_COMM_WRITE | AD7793_COMM_ADDR(reg); | |
81 | ||
82 | switch (size) { | |
83 | case 3: | |
84 | data[1] = val >> 16; | |
85 | data[2] = val >> 8; | |
86 | data[3] = val; | |
87 | break; | |
88 | case 2: | |
89 | data[1] = val >> 8; | |
90 | data[2] = val; | |
91 | break; | |
92 | case 1: | |
93 | data[1] = val; | |
94 | break; | |
95 | default: | |
96 | return -EINVAL; | |
97 | } | |
98 | ||
99 | spi_message_init(&m); | |
100 | spi_message_add_tail(&t, &m); | |
101 | ||
102 | if (locked) | |
103 | return spi_sync_locked(st->spi, &m); | |
104 | else | |
105 | return spi_sync(st->spi, &m); | |
106 | } | |
107 | ||
108 | static int ad7793_write_reg(struct ad7793_state *st, | |
109 | unsigned reg, unsigned size, unsigned val) | |
110 | { | |
111 | return __ad7793_write_reg(st, false, false, reg, size, val); | |
112 | } | |
113 | ||
114 | static int __ad7793_read_reg(struct ad7793_state *st, bool locked, | |
115 | bool cs_change, unsigned char reg, | |
116 | int *val, unsigned size) | |
117 | { | |
118 | u8 *data = st->data; | |
119 | int ret; | |
120 | struct spi_transfer t[] = { | |
121 | { | |
122 | .tx_buf = data, | |
123 | .len = 1, | |
124 | }, { | |
125 | .rx_buf = data, | |
126 | .len = size, | |
127 | .cs_change = cs_change, | |
128 | }, | |
129 | }; | |
130 | struct spi_message m; | |
131 | ||
132 | data[0] = AD7793_COMM_READ | AD7793_COMM_ADDR(reg); | |
133 | ||
134 | spi_message_init(&m); | |
135 | spi_message_add_tail(&t[0], &m); | |
136 | spi_message_add_tail(&t[1], &m); | |
137 | ||
138 | if (locked) | |
139 | ret = spi_sync_locked(st->spi, &m); | |
140 | else | |
141 | ret = spi_sync(st->spi, &m); | |
142 | ||
143 | if (ret < 0) | |
144 | return ret; | |
145 | ||
146 | switch (size) { | |
147 | case 3: | |
148 | *val = data[0] << 16 | data[1] << 8 | data[2]; | |
149 | break; | |
150 | case 2: | |
151 | *val = data[0] << 8 | data[1]; | |
152 | break; | |
153 | case 1: | |
154 | *val = data[0]; | |
155 | break; | |
156 | default: | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int ad7793_read_reg(struct ad7793_state *st, | |
164 | unsigned reg, int *val, unsigned size) | |
165 | { | |
166 | return __ad7793_read_reg(st, 0, 0, reg, val, size); | |
167 | } | |
168 | ||
169 | static int ad7793_read(struct ad7793_state *st, unsigned ch, | |
170 | unsigned len, int *val) | |
171 | { | |
172 | int ret; | |
173 | st->conf = (st->conf & ~AD7793_CONF_CHAN(-1)) | AD7793_CONF_CHAN(ch); | |
174 | st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | | |
175 | AD7793_MODE_SEL(AD7793_MODE_SINGLE); | |
176 | ||
177 | ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); | |
178 | ||
179 | spi_bus_lock(st->spi->master); | |
180 | st->done = false; | |
181 | ||
182 | ret = __ad7793_write_reg(st, 1, 1, AD7793_REG_MODE, | |
183 | sizeof(st->mode), st->mode); | |
184 | if (ret < 0) | |
185 | goto out; | |
186 | ||
187 | st->irq_dis = false; | |
188 | enable_irq(st->spi->irq); | |
189 | wait_event_interruptible(st->wq_data_avail, st->done); | |
190 | ||
191 | ret = __ad7793_read_reg(st, 1, 0, AD7793_REG_DATA, val, len); | |
192 | out: | |
193 | spi_bus_unlock(st->spi->master); | |
194 | ||
195 | return ret; | |
196 | } | |
197 | ||
198 | static int ad7793_calibrate(struct ad7793_state *st, unsigned mode, unsigned ch) | |
199 | { | |
200 | int ret; | |
201 | ||
202 | st->conf = (st->conf & ~AD7793_CONF_CHAN(-1)) | AD7793_CONF_CHAN(ch); | |
203 | st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | AD7793_MODE_SEL(mode); | |
204 | ||
205 | ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); | |
206 | ||
207 | spi_bus_lock(st->spi->master); | |
208 | st->done = false; | |
209 | ||
210 | ret = __ad7793_write_reg(st, 1, 1, AD7793_REG_MODE, | |
211 | sizeof(st->mode), st->mode); | |
212 | if (ret < 0) | |
213 | goto out; | |
214 | ||
215 | st->irq_dis = false; | |
216 | enable_irq(st->spi->irq); | |
217 | wait_event_interruptible(st->wq_data_avail, st->done); | |
218 | ||
219 | st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | | |
220 | AD7793_MODE_SEL(AD7793_MODE_IDLE); | |
221 | ||
222 | ret = __ad7793_write_reg(st, 1, 0, AD7793_REG_MODE, | |
223 | sizeof(st->mode), st->mode); | |
224 | out: | |
225 | spi_bus_unlock(st->spi->master); | |
226 | ||
227 | return ret; | |
228 | } | |
229 | ||
230 | static const u8 ad7793_calib_arr[6][2] = { | |
231 | {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M}, | |
232 | {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M}, | |
233 | {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M}, | |
234 | {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M}, | |
235 | {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M}, | |
236 | {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M} | |
237 | }; | |
238 | ||
239 | static int ad7793_calibrate_all(struct ad7793_state *st) | |
240 | { | |
241 | int i, ret; | |
242 | ||
243 | for (i = 0; i < ARRAY_SIZE(ad7793_calib_arr); i++) { | |
244 | ret = ad7793_calibrate(st, ad7793_calib_arr[i][0], | |
245 | ad7793_calib_arr[i][1]); | |
246 | if (ret) | |
247 | goto out; | |
248 | } | |
249 | ||
250 | return 0; | |
251 | out: | |
252 | dev_err(&st->spi->dev, "Calibration failed\n"); | |
253 | return ret; | |
254 | } | |
255 | ||
256 | static int ad7793_setup(struct ad7793_state *st) | |
257 | { | |
258 | int i, ret = -1; | |
259 | unsigned long long scale_uv; | |
260 | u32 id; | |
261 | ||
262 | /* reset the serial interface */ | |
263 | ret = spi_write(st->spi, (u8 *)&ret, sizeof(ret)); | |
264 | if (ret < 0) | |
265 | goto out; | |
266 | msleep(1); /* Wait for at least 500us */ | |
267 | ||
268 | /* write/read test for device presence */ | |
269 | ret = ad7793_read_reg(st, AD7793_REG_ID, &id, 1); | |
270 | if (ret) | |
271 | goto out; | |
272 | ||
273 | id &= AD7793_ID_MASK; | |
274 | ||
275 | if (!((id == AD7792_ID) || (id == AD7793_ID))) { | |
276 | dev_err(&st->spi->dev, "device ID query failed\n"); | |
277 | goto out; | |
278 | } | |
279 | ||
280 | st->mode = (st->pdata->mode & ~AD7793_MODE_SEL(-1)) | | |
281 | AD7793_MODE_SEL(AD7793_MODE_IDLE); | |
282 | st->conf = st->pdata->conf & ~AD7793_CONF_CHAN(-1); | |
283 | ||
284 | ret = ad7793_write_reg(st, AD7793_REG_MODE, sizeof(st->mode), st->mode); | |
285 | if (ret) | |
286 | goto out; | |
287 | ||
288 | ret = ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); | |
289 | if (ret) | |
290 | goto out; | |
291 | ||
292 | ret = ad7793_write_reg(st, AD7793_REG_IO, | |
293 | sizeof(st->pdata->io), st->pdata->io); | |
294 | if (ret) | |
295 | goto out; | |
296 | ||
297 | ret = ad7793_calibrate_all(st); | |
298 | if (ret) | |
299 | goto out; | |
300 | ||
301 | /* Populate available ADC input ranges */ | |
302 | for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { | |
303 | scale_uv = ((u64)st->int_vref_mv * 100000000) | |
304 | >> (st->chip_info->channel[0].scan_type.realbits - | |
305 | (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1)); | |
306 | scale_uv >>= i; | |
307 | ||
308 | st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; | |
309 | st->scale_avail[i][0] = scale_uv; | |
310 | } | |
311 | ||
312 | return 0; | |
313 | out: | |
314 | dev_err(&st->spi->dev, "setup failed\n"); | |
315 | return ret; | |
316 | } | |
317 | ||
88bc3054 MH |
318 | static int ad7793_ring_preenable(struct iio_dev *indio_dev) |
319 | { | |
320 | struct ad7793_state *st = iio_priv(indio_dev); | |
88bc3054 | 321 | unsigned channel; |
81a4fc01 | 322 | int ret; |
88bc3054 | 323 | |
550268ca | 324 | if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength)) |
88bc3054 | 325 | return -EINVAL; |
81a4fc01 JC |
326 | ret = iio_sw_buffer_preenable(indio_dev); |
327 | if (ret < 0) | |
328 | return ret; | |
88bc3054 | 329 | |
550268ca | 330 | channel = find_first_bit(indio_dev->active_scan_mask, |
32b5eeca | 331 | indio_dev->masklength); |
88bc3054 | 332 | |
88bc3054 MH |
333 | st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | |
334 | AD7793_MODE_SEL(AD7793_MODE_CONT); | |
335 | st->conf = (st->conf & ~AD7793_CONF_CHAN(-1)) | | |
336 | AD7793_CONF_CHAN(indio_dev->channels[channel].address); | |
337 | ||
338 | ad7793_write_reg(st, AD7793_REG_CONF, sizeof(st->conf), st->conf); | |
339 | ||
340 | spi_bus_lock(st->spi->master); | |
341 | __ad7793_write_reg(st, 1, 1, AD7793_REG_MODE, | |
342 | sizeof(st->mode), st->mode); | |
343 | ||
344 | st->irq_dis = false; | |
345 | enable_irq(st->spi->irq); | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | static int ad7793_ring_postdisable(struct iio_dev *indio_dev) | |
351 | { | |
352 | struct ad7793_state *st = iio_priv(indio_dev); | |
353 | ||
354 | st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) | | |
355 | AD7793_MODE_SEL(AD7793_MODE_IDLE); | |
356 | ||
357 | st->done = false; | |
358 | wait_event_interruptible(st->wq_data_avail, st->done); | |
359 | ||
360 | if (!st->irq_dis) | |
361 | disable_irq_nosync(st->spi->irq); | |
362 | ||
363 | __ad7793_write_reg(st, 1, 0, AD7793_REG_MODE, | |
364 | sizeof(st->mode), st->mode); | |
365 | ||
366 | return spi_bus_unlock(st->spi->master); | |
367 | } | |
368 | ||
369 | /** | |
370 | * ad7793_trigger_handler() bh of trigger launched polling to ring buffer | |
371 | **/ | |
372 | ||
373 | static irqreturn_t ad7793_trigger_handler(int irq, void *p) | |
374 | { | |
375 | struct iio_poll_func *pf = p; | |
e65bc6ac | 376 | struct iio_dev *indio_dev = pf->indio_dev; |
14555b14 | 377 | struct iio_buffer *ring = indio_dev->buffer; |
88bc3054 MH |
378 | struct ad7793_state *st = iio_priv(indio_dev); |
379 | s64 dat64[2]; | |
380 | s32 *dat32 = (s32 *)dat64; | |
381 | ||
550268ca | 382 | if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength)) |
88bc3054 MH |
383 | __ad7793_read_reg(st, 1, 1, AD7793_REG_DATA, |
384 | dat32, | |
385 | indio_dev->channels[0].scan_type.realbits/8); | |
386 | ||
387 | /* Guaranteed to be aligned with 8 byte boundary */ | |
fd6487f8 | 388 | if (indio_dev->scan_timestamp) |
88bc3054 MH |
389 | dat64[1] = pf->timestamp; |
390 | ||
391 | ring->access->store_to(ring, (u8 *)dat64, pf->timestamp); | |
392 | ||
393 | iio_trigger_notify_done(indio_dev->trig); | |
394 | st->irq_dis = false; | |
395 | enable_irq(st->spi->irq); | |
396 | ||
397 | return IRQ_HANDLED; | |
398 | } | |
399 | ||
14555b14 | 400 | static const struct iio_buffer_setup_ops ad7793_ring_setup_ops = { |
88bc3054 | 401 | .preenable = &ad7793_ring_preenable, |
3b99fb76 JC |
402 | .postenable = &iio_triggered_buffer_postenable, |
403 | .predisable = &iio_triggered_buffer_predisable, | |
88bc3054 | 404 | .postdisable = &ad7793_ring_postdisable, |
8c2c6ba6 | 405 | .validate_scan_mask = &iio_validate_scan_mask_onehot, |
88bc3054 MH |
406 | }; |
407 | ||
408 | static int ad7793_register_ring_funcs_and_init(struct iio_dev *indio_dev) | |
409 | { | |
82796edc LPC |
410 | return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, |
411 | &ad7793_trigger_handler, &ad7793_ring_setup_ops); | |
88bc3054 MH |
412 | } |
413 | ||
414 | static void ad7793_ring_cleanup(struct iio_dev *indio_dev) | |
415 | { | |
82796edc | 416 | iio_triggered_buffer_cleanup(indio_dev); |
88bc3054 MH |
417 | } |
418 | ||
419 | /** | |
420 | * ad7793_data_rdy_trig_poll() the event handler for the data rdy trig | |
421 | **/ | |
422 | static irqreturn_t ad7793_data_rdy_trig_poll(int irq, void *private) | |
423 | { | |
424 | struct ad7793_state *st = iio_priv(private); | |
425 | ||
426 | st->done = true; | |
427 | wake_up_interruptible(&st->wq_data_avail); | |
428 | disable_irq_nosync(irq); | |
429 | st->irq_dis = true; | |
430 | iio_trigger_poll(st->trig, iio_get_time_ns()); | |
431 | ||
432 | return IRQ_HANDLED; | |
433 | } | |
434 | ||
8324e860 JC |
435 | static struct iio_trigger_ops ad7793_trigger_ops = { |
436 | .owner = THIS_MODULE, | |
437 | }; | |
438 | ||
88bc3054 MH |
439 | static int ad7793_probe_trigger(struct iio_dev *indio_dev) |
440 | { | |
441 | struct ad7793_state *st = iio_priv(indio_dev); | |
442 | int ret; | |
443 | ||
7cbb7537 | 444 | st->trig = iio_trigger_alloc("%s-dev%d", |
88bc3054 MH |
445 | spi_get_device_id(st->spi)->name, |
446 | indio_dev->id); | |
447 | if (st->trig == NULL) { | |
448 | ret = -ENOMEM; | |
449 | goto error_ret; | |
450 | } | |
8324e860 | 451 | st->trig->ops = &ad7793_trigger_ops; |
88bc3054 MH |
452 | |
453 | ret = request_irq(st->spi->irq, | |
454 | ad7793_data_rdy_trig_poll, | |
455 | IRQF_TRIGGER_LOW, | |
456 | spi_get_device_id(st->spi)->name, | |
457 | indio_dev); | |
458 | if (ret) | |
459 | goto error_free_trig; | |
460 | ||
461 | disable_irq_nosync(st->spi->irq); | |
462 | st->irq_dis = true; | |
463 | st->trig->dev.parent = &st->spi->dev; | |
88bc3054 MH |
464 | st->trig->private_data = indio_dev; |
465 | ||
466 | ret = iio_trigger_register(st->trig); | |
467 | ||
468 | /* select default trigger */ | |
469 | indio_dev->trig = st->trig; | |
470 | if (ret) | |
471 | goto error_free_irq; | |
472 | ||
473 | return 0; | |
474 | ||
475 | error_free_irq: | |
476 | free_irq(st->spi->irq, indio_dev); | |
477 | error_free_trig: | |
7cbb7537 | 478 | iio_trigger_free(st->trig); |
88bc3054 MH |
479 | error_ret: |
480 | return ret; | |
481 | } | |
482 | ||
483 | static void ad7793_remove_trigger(struct iio_dev *indio_dev) | |
484 | { | |
485 | struct ad7793_state *st = iio_priv(indio_dev); | |
486 | ||
487 | iio_trigger_unregister(st->trig); | |
488 | free_irq(st->spi->irq, indio_dev); | |
7cbb7537 | 489 | iio_trigger_free(st->trig); |
88bc3054 MH |
490 | } |
491 | ||
492 | static const u16 sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, 33, 19, | |
493 | 17, 16, 12, 10, 8, 6, 4}; | |
494 | ||
495 | static ssize_t ad7793_read_frequency(struct device *dev, | |
496 | struct device_attribute *attr, | |
497 | char *buf) | |
498 | { | |
62c51839 | 499 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
88bc3054 MH |
500 | struct ad7793_state *st = iio_priv(indio_dev); |
501 | ||
502 | return sprintf(buf, "%d\n", | |
503 | sample_freq_avail[AD7793_MODE_RATE(st->mode)]); | |
504 | } | |
505 | ||
506 | static ssize_t ad7793_write_frequency(struct device *dev, | |
507 | struct device_attribute *attr, | |
508 | const char *buf, | |
509 | size_t len) | |
510 | { | |
62c51839 | 511 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
88bc3054 MH |
512 | struct ad7793_state *st = iio_priv(indio_dev); |
513 | long lval; | |
514 | int i, ret; | |
515 | ||
516 | mutex_lock(&indio_dev->mlock); | |
14555b14 | 517 | if (iio_buffer_enabled(indio_dev)) { |
88bc3054 MH |
518 | mutex_unlock(&indio_dev->mlock); |
519 | return -EBUSY; | |
520 | } | |
521 | mutex_unlock(&indio_dev->mlock); | |
522 | ||
523 | ret = strict_strtol(buf, 10, &lval); | |
524 | if (ret) | |
525 | return ret; | |
526 | ||
527 | ret = -EINVAL; | |
528 | ||
529 | for (i = 0; i < ARRAY_SIZE(sample_freq_avail); i++) | |
530 | if (lval == sample_freq_avail[i]) { | |
531 | mutex_lock(&indio_dev->mlock); | |
532 | st->mode &= ~AD7793_MODE_RATE(-1); | |
533 | st->mode |= AD7793_MODE_RATE(i); | |
534 | ad7793_write_reg(st, AD7793_REG_MODE, | |
535 | sizeof(st->mode), st->mode); | |
536 | mutex_unlock(&indio_dev->mlock); | |
537 | ret = 0; | |
538 | } | |
539 | ||
540 | return ret ? ret : len; | |
541 | } | |
542 | ||
543 | static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, | |
544 | ad7793_read_frequency, | |
545 | ad7793_write_frequency); | |
546 | ||
547 | static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( | |
548 | "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4"); | |
549 | ||
550 | static ssize_t ad7793_show_scale_available(struct device *dev, | |
551 | struct device_attribute *attr, char *buf) | |
552 | { | |
62c51839 | 553 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
88bc3054 MH |
554 | struct ad7793_state *st = iio_priv(indio_dev); |
555 | int i, len = 0; | |
556 | ||
557 | for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) | |
558 | len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0], | |
559 | st->scale_avail[i][1]); | |
560 | ||
561 | len += sprintf(buf + len, "\n"); | |
562 | ||
563 | return len; | |
564 | } | |
565 | ||
566 | static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available, in-in_scale_available, | |
567 | S_IRUGO, ad7793_show_scale_available, NULL, 0); | |
568 | ||
569 | static struct attribute *ad7793_attributes[] = { | |
570 | &iio_dev_attr_sampling_frequency.dev_attr.attr, | |
571 | &iio_const_attr_sampling_frequency_available.dev_attr.attr, | |
572 | &iio_dev_attr_in_m_in_scale_available.dev_attr.attr, | |
573 | NULL | |
574 | }; | |
575 | ||
576 | static const struct attribute_group ad7793_attribute_group = { | |
577 | .attrs = ad7793_attributes, | |
578 | }; | |
579 | ||
580 | static int ad7793_read_raw(struct iio_dev *indio_dev, | |
581 | struct iio_chan_spec const *chan, | |
582 | int *val, | |
583 | int *val2, | |
584 | long m) | |
585 | { | |
586 | struct ad7793_state *st = iio_priv(indio_dev); | |
587 | int ret, smpl = 0; | |
588 | unsigned long long scale_uv; | |
589 | bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR); | |
590 | ||
591 | switch (m) { | |
b11f98ff | 592 | case IIO_CHAN_INFO_RAW: |
88bc3054 | 593 | mutex_lock(&indio_dev->mlock); |
14555b14 | 594 | if (iio_buffer_enabled(indio_dev)) |
950935b1 | 595 | ret = -EBUSY; |
88bc3054 MH |
596 | else |
597 | ret = ad7793_read(st, chan->address, | |
598 | chan->scan_type.realbits / 8, &smpl); | |
599 | mutex_unlock(&indio_dev->mlock); | |
600 | ||
601 | if (ret < 0) | |
602 | return ret; | |
603 | ||
604 | *val = (smpl >> chan->scan_type.shift) & | |
605 | ((1 << (chan->scan_type.realbits)) - 1); | |
606 | ||
607 | if (!unipolar) | |
608 | *val -= (1 << (chan->scan_type.realbits - 1)); | |
609 | ||
610 | return IIO_VAL_INT; | |
611 | ||
c8a9f805 | 612 | case IIO_CHAN_INFO_SCALE: |
88bc3054 | 613 | switch (chan->type) { |
6835cb6b | 614 | case IIO_VOLTAGE: |
c8a9f805 JC |
615 | if (chan->differential) { |
616 | *val = st-> | |
617 | scale_avail[(st->conf >> 8) & 0x7][0]; | |
618 | *val2 = st-> | |
619 | scale_avail[(st->conf >> 8) & 0x7][1]; | |
620 | return IIO_VAL_INT_PLUS_NANO; | |
621 | } else { | |
622 | /* 1170mV / 2^23 * 6 */ | |
623 | scale_uv = (1170ULL * 100000000ULL * 6ULL) | |
624 | >> (chan->scan_type.realbits - | |
625 | (unipolar ? 0 : 1)); | |
626 | } | |
88bc3054 MH |
627 | break; |
628 | case IIO_TEMP: | |
629 | /* Always uses unity gain and internal ref */ | |
630 | scale_uv = (2500ULL * 100000000ULL) | |
631 | >> (chan->scan_type.realbits - | |
632 | (unipolar ? 0 : 1)); | |
633 | break; | |
634 | default: | |
635 | return -EINVAL; | |
636 | } | |
637 | ||
638 | *val2 = do_div(scale_uv, 100000000) * 10; | |
639 | *val = scale_uv; | |
640 | ||
641 | return IIO_VAL_INT_PLUS_NANO; | |
642 | } | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
646 | static int ad7793_write_raw(struct iio_dev *indio_dev, | |
647 | struct iio_chan_spec const *chan, | |
648 | int val, | |
649 | int val2, | |
650 | long mask) | |
651 | { | |
652 | struct ad7793_state *st = iio_priv(indio_dev); | |
653 | int ret, i; | |
654 | unsigned int tmp; | |
655 | ||
656 | mutex_lock(&indio_dev->mlock); | |
14555b14 | 657 | if (iio_buffer_enabled(indio_dev)) { |
88bc3054 MH |
658 | mutex_unlock(&indio_dev->mlock); |
659 | return -EBUSY; | |
660 | } | |
661 | ||
662 | switch (mask) { | |
c8a9f805 | 663 | case IIO_CHAN_INFO_SCALE: |
88bc3054 MH |
664 | ret = -EINVAL; |
665 | for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) | |
666 | if (val2 == st->scale_avail[i][1]) { | |
667 | tmp = st->conf; | |
668 | st->conf &= ~AD7793_CONF_GAIN(-1); | |
669 | st->conf |= AD7793_CONF_GAIN(i); | |
670 | ||
671 | if (tmp != st->conf) { | |
672 | ad7793_write_reg(st, AD7793_REG_CONF, | |
673 | sizeof(st->conf), | |
674 | st->conf); | |
675 | ad7793_calibrate_all(st); | |
676 | } | |
677 | ret = 0; | |
678 | } | |
421afe58 | 679 | break; |
88bc3054 MH |
680 | default: |
681 | ret = -EINVAL; | |
682 | } | |
683 | ||
684 | mutex_unlock(&indio_dev->mlock); | |
685 | return ret; | |
686 | } | |
687 | ||
688 | static int ad7793_validate_trigger(struct iio_dev *indio_dev, | |
689 | struct iio_trigger *trig) | |
690 | { | |
691 | if (indio_dev->trig != trig) | |
692 | return -EINVAL; | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
697 | static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev, | |
698 | struct iio_chan_spec const *chan, | |
699 | long mask) | |
700 | { | |
701 | return IIO_VAL_INT_PLUS_NANO; | |
702 | } | |
703 | ||
704 | static const struct iio_info ad7793_info = { | |
705 | .read_raw = &ad7793_read_raw, | |
706 | .write_raw = &ad7793_write_raw, | |
707 | .write_raw_get_fmt = &ad7793_write_raw_get_fmt, | |
708 | .attrs = &ad7793_attribute_group, | |
709 | .validate_trigger = ad7793_validate_trigger, | |
710 | .driver_module = THIS_MODULE, | |
711 | }; | |
712 | ||
713 | static const struct ad7793_chip_info ad7793_chip_info_tbl[] = { | |
714 | [ID_AD7793] = { | |
ade7ef7b JC |
715 | .channel[0] = { |
716 | .type = IIO_VOLTAGE, | |
717 | .differential = 1, | |
718 | .indexed = 1, | |
719 | .channel = 0, | |
720 | .channel2 = 0, | |
721 | .address = AD7793_CH_AIN1P_AIN1M, | |
b11f98ff JC |
722 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
723 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
ade7ef7b | 724 | .scan_index = 0, |
e8353909 | 725 | .scan_type = IIO_ST('u', 24, 32, 0) |
ade7ef7b JC |
726 | }, |
727 | .channel[1] = { | |
728 | .type = IIO_VOLTAGE, | |
729 | .differential = 1, | |
730 | .indexed = 1, | |
731 | .channel = 1, | |
732 | .channel2 = 1, | |
733 | .address = AD7793_CH_AIN2P_AIN2M, | |
b11f98ff JC |
734 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
735 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
ade7ef7b | 736 | .scan_index = 1, |
e8353909 | 737 | .scan_type = IIO_ST('u', 24, 32, 0) |
ade7ef7b JC |
738 | }, |
739 | .channel[2] = { | |
740 | .type = IIO_VOLTAGE, | |
741 | .differential = 1, | |
742 | .indexed = 1, | |
743 | .channel = 2, | |
744 | .channel2 = 2, | |
745 | .address = AD7793_CH_AIN3P_AIN3M, | |
b11f98ff JC |
746 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
747 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
ade7ef7b | 748 | .scan_index = 2, |
e8353909 | 749 | .scan_type = IIO_ST('u', 24, 32, 0) |
ade7ef7b JC |
750 | }, |
751 | .channel[3] = { | |
752 | .type = IIO_VOLTAGE, | |
753 | .differential = 1, | |
754 | .extend_name = "shorted", | |
755 | .indexed = 1, | |
756 | .channel = 2, | |
757 | .channel2 = 2, | |
758 | .address = AD7793_CH_AIN1M_AIN1M, | |
b11f98ff JC |
759 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
760 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
05eda67d | 761 | .scan_index = 3, |
e8353909 | 762 | .scan_type = IIO_ST('u', 24, 32, 0) |
ade7ef7b JC |
763 | }, |
764 | .channel[4] = { | |
765 | .type = IIO_TEMP, | |
766 | .indexed = 1, | |
767 | .channel = 0, | |
768 | .address = AD7793_CH_TEMP, | |
b11f98ff JC |
769 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
770 | IIO_CHAN_INFO_SCALE_SEPARATE_BIT, | |
ade7ef7b | 771 | .scan_index = 4, |
e8353909 | 772 | .scan_type = IIO_ST('u', 24, 32, 0), |
ade7ef7b JC |
773 | }, |
774 | .channel[5] = { | |
775 | .type = IIO_VOLTAGE, | |
776 | .extend_name = "supply", | |
777 | .indexed = 1, | |
778 | .channel = 4, | |
779 | .address = AD7793_CH_AVDD_MONITOR, | |
b11f98ff JC |
780 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
781 | IIO_CHAN_INFO_SCALE_SEPARATE_BIT, | |
ade7ef7b | 782 | .scan_index = 5, |
e8353909 | 783 | .scan_type = IIO_ST('u', 24, 32, 0), |
ade7ef7b | 784 | }, |
88bc3054 MH |
785 | .channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6), |
786 | }, | |
787 | [ID_AD7792] = { | |
ade7ef7b JC |
788 | .channel[0] = { |
789 | .type = IIO_VOLTAGE, | |
790 | .differential = 1, | |
791 | .indexed = 1, | |
792 | .channel = 0, | |
793 | .channel2 = 0, | |
794 | .address = AD7793_CH_AIN1P_AIN1M, | |
b11f98ff JC |
795 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
796 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
ade7ef7b | 797 | .scan_index = 0, |
e8353909 | 798 | .scan_type = IIO_ST('u', 16, 32, 0) |
ade7ef7b JC |
799 | }, |
800 | .channel[1] = { | |
801 | .type = IIO_VOLTAGE, | |
802 | .differential = 1, | |
803 | .indexed = 1, | |
804 | .channel = 1, | |
805 | .channel2 = 1, | |
806 | .address = AD7793_CH_AIN2P_AIN2M, | |
b11f98ff JC |
807 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
808 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
ade7ef7b | 809 | .scan_index = 1, |
e8353909 | 810 | .scan_type = IIO_ST('u', 16, 32, 0) |
ade7ef7b JC |
811 | }, |
812 | .channel[2] = { | |
813 | .type = IIO_VOLTAGE, | |
814 | .differential = 1, | |
815 | .indexed = 1, | |
816 | .channel = 2, | |
817 | .channel2 = 2, | |
818 | .address = AD7793_CH_AIN3P_AIN3M, | |
b11f98ff JC |
819 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
820 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
ade7ef7b | 821 | .scan_index = 2, |
e8353909 | 822 | .scan_type = IIO_ST('u', 16, 32, 0) |
ade7ef7b JC |
823 | }, |
824 | .channel[3] = { | |
825 | .type = IIO_VOLTAGE, | |
826 | .differential = 1, | |
827 | .extend_name = "shorted", | |
828 | .indexed = 1, | |
829 | .channel = 2, | |
830 | .channel2 = 2, | |
831 | .address = AD7793_CH_AIN1M_AIN1M, | |
b11f98ff JC |
832 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
833 | IIO_CHAN_INFO_SCALE_SHARED_BIT, | |
05eda67d | 834 | .scan_index = 3, |
e8353909 | 835 | .scan_type = IIO_ST('u', 16, 32, 0) |
ade7ef7b JC |
836 | }, |
837 | .channel[4] = { | |
838 | .type = IIO_TEMP, | |
839 | .indexed = 1, | |
840 | .channel = 0, | |
841 | .address = AD7793_CH_TEMP, | |
b11f98ff JC |
842 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
843 | IIO_CHAN_INFO_SCALE_SEPARATE_BIT, | |
ade7ef7b | 844 | .scan_index = 4, |
e8353909 | 845 | .scan_type = IIO_ST('u', 16, 32, 0), |
ade7ef7b JC |
846 | }, |
847 | .channel[5] = { | |
848 | .type = IIO_VOLTAGE, | |
849 | .extend_name = "supply", | |
850 | .indexed = 1, | |
851 | .channel = 4, | |
852 | .address = AD7793_CH_AVDD_MONITOR, | |
b11f98ff JC |
853 | .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | |
854 | IIO_CHAN_INFO_SCALE_SEPARATE_BIT, | |
ade7ef7b | 855 | .scan_index = 5, |
e8353909 | 856 | .scan_type = IIO_ST('u', 16, 32, 0), |
ade7ef7b | 857 | }, |
88bc3054 MH |
858 | .channel[6] = IIO_CHAN_SOFT_TIMESTAMP(6), |
859 | }, | |
860 | }; | |
861 | ||
862 | static int __devinit ad7793_probe(struct spi_device *spi) | |
863 | { | |
864 | struct ad7793_platform_data *pdata = spi->dev.platform_data; | |
865 | struct ad7793_state *st; | |
866 | struct iio_dev *indio_dev; | |
8c2c6ba6 | 867 | int ret, voltage_uv = 0; |
88bc3054 MH |
868 | |
869 | if (!pdata) { | |
870 | dev_err(&spi->dev, "no platform data?\n"); | |
871 | return -ENODEV; | |
872 | } | |
873 | ||
874 | if (!spi->irq) { | |
875 | dev_err(&spi->dev, "no IRQ?\n"); | |
876 | return -ENODEV; | |
877 | } | |
878 | ||
7cbb7537 | 879 | indio_dev = iio_device_alloc(sizeof(*st)); |
88bc3054 MH |
880 | if (indio_dev == NULL) |
881 | return -ENOMEM; | |
882 | ||
883 | st = iio_priv(indio_dev); | |
884 | ||
885 | st->reg = regulator_get(&spi->dev, "vcc"); | |
886 | if (!IS_ERR(st->reg)) { | |
887 | ret = regulator_enable(st->reg); | |
888 | if (ret) | |
889 | goto error_put_reg; | |
890 | ||
891 | voltage_uv = regulator_get_voltage(st->reg); | |
892 | } | |
893 | ||
894 | st->chip_info = | |
895 | &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data]; | |
896 | ||
897 | st->pdata = pdata; | |
898 | ||
899 | if (pdata && pdata->vref_mv) | |
900 | st->int_vref_mv = pdata->vref_mv; | |
901 | else if (voltage_uv) | |
902 | st->int_vref_mv = voltage_uv / 1000; | |
903 | else | |
904 | st->int_vref_mv = 2500; /* Build-in ref */ | |
905 | ||
906 | spi_set_drvdata(spi, indio_dev); | |
907 | st->spi = spi; | |
908 | ||
909 | indio_dev->dev.parent = &spi->dev; | |
910 | indio_dev->name = spi_get_device_id(spi)->name; | |
911 | indio_dev->modes = INDIO_DIRECT_MODE; | |
912 | indio_dev->channels = st->chip_info->channel; | |
88bc3054 MH |
913 | indio_dev->num_channels = 7; |
914 | indio_dev->info = &ad7793_info; | |
915 | ||
88bc3054 MH |
916 | init_waitqueue_head(&st->wq_data_avail); |
917 | ||
918 | ret = ad7793_register_ring_funcs_and_init(indio_dev); | |
919 | if (ret) | |
920 | goto error_disable_reg; | |
921 | ||
88bc3054 MH |
922 | ret = ad7793_probe_trigger(indio_dev); |
923 | if (ret) | |
924 | goto error_unreg_ring; | |
925 | ||
88bc3054 MH |
926 | ret = ad7793_setup(st); |
927 | if (ret) | |
82796edc | 928 | goto error_remove_trigger; |
88bc3054 | 929 | |
26d25ae3 JC |
930 | ret = iio_device_register(indio_dev); |
931 | if (ret) | |
82796edc | 932 | goto error_remove_trigger; |
26d25ae3 | 933 | |
88bc3054 MH |
934 | return 0; |
935 | ||
88bc3054 MH |
936 | error_remove_trigger: |
937 | ad7793_remove_trigger(indio_dev); | |
938 | error_unreg_ring: | |
939 | ad7793_ring_cleanup(indio_dev); | |
940 | error_disable_reg: | |
941 | if (!IS_ERR(st->reg)) | |
942 | regulator_disable(st->reg); | |
943 | error_put_reg: | |
944 | if (!IS_ERR(st->reg)) | |
945 | regulator_put(st->reg); | |
946 | ||
7cbb7537 | 947 | iio_device_free(indio_dev); |
88bc3054 MH |
948 | |
949 | return ret; | |
950 | } | |
951 | ||
952 | static int ad7793_remove(struct spi_device *spi) | |
953 | { | |
954 | struct iio_dev *indio_dev = spi_get_drvdata(spi); | |
955 | struct ad7793_state *st = iio_priv(indio_dev); | |
956 | ||
d2fffd6c | 957 | iio_device_unregister(indio_dev); |
88bc3054 MH |
958 | ad7793_remove_trigger(indio_dev); |
959 | ad7793_ring_cleanup(indio_dev); | |
960 | ||
961 | if (!IS_ERR(st->reg)) { | |
962 | regulator_disable(st->reg); | |
963 | regulator_put(st->reg); | |
964 | } | |
965 | ||
7cbb7537 | 966 | iio_device_free(indio_dev); |
88bc3054 MH |
967 | |
968 | return 0; | |
969 | } | |
970 | ||
971 | static const struct spi_device_id ad7793_id[] = { | |
972 | {"ad7792", ID_AD7792}, | |
973 | {"ad7793", ID_AD7793}, | |
974 | {} | |
975 | }; | |
55e4390c | 976 | MODULE_DEVICE_TABLE(spi, ad7793_id); |
88bc3054 MH |
977 | |
978 | static struct spi_driver ad7793_driver = { | |
979 | .driver = { | |
980 | .name = "ad7793", | |
88bc3054 MH |
981 | .owner = THIS_MODULE, |
982 | }, | |
983 | .probe = ad7793_probe, | |
984 | .remove = __devexit_p(ad7793_remove), | |
985 | .id_table = ad7793_id, | |
986 | }; | |
ae6ae6fe | 987 | module_spi_driver(ad7793_driver); |
88bc3054 MH |
988 | |
989 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
990 | MODULE_DESCRIPTION("Analog Devices AD7792/3 ADC"); | |
991 | MODULE_LICENSE("GPL v2"); |