libam7xxx  0.1
Communication library for Actions Micro AM7XXX based USB projectors and DPFs
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am7xxx.c
1 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
2  *
3  * Copyright (C) 2012-2014 Antonio Ospite <ao2@ao2.it>
4  *
5  * This program is free software: you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation, either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <stdarg.h>
23 #include <errno.h>
24 #include <libusb.h>
25 #include <math.h>
26 
27 #include "am7xxx.h"
28 #include "serialize.h"
29 #include "tools.h"
30 
31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
32 
33 /* If we're not using GNU C, elide __attribute__
34  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
35  */
36 #ifndef __GNUC__
37 # define __attribute__(x) /*NOTHING*/
38 #endif
39 
40 /* Control shared library symbols visibility */
41 #if defined _WIN32 || defined __CYGWIN__
42  #define AM7XXX_PUBLIC __declspec(dllexport)
43  #define AM7XXX_LOCAL
44 #else
45  #if __GNUC__ >= 4
46  #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
47  #define AM7XXX_LOCAL __attribute__ ((visibility ("hidden")))
48  #else
49  #define AM7XXX_PUBLIC
50  #define AM7XXX_LOCAL
51  #endif
52 #endif
53 
54 static void log_message(am7xxx_context *ctx,
55  int level,
56  const char *function,
57  int line,
58  const char *fmt,
59  ...) __attribute__ ((format (printf, 5, 6)));
60 
61 #define fatal(...) log_message(NULL, AM7XXX_LOG_FATAL, __func__, __LINE__, __VA_ARGS__)
62 #define error(ctx, ...) log_message(ctx, AM7XXX_LOG_ERROR, __func__, __LINE__, __VA_ARGS__)
63 #define warning(ctx, ...) log_message(ctx, AM7XXX_LOG_WARNING, __func__, 0, __VA_ARGS__)
64 #define info(ctx, ...) log_message(ctx, AM7XXX_LOG_INFO, __func__, 0, __VA_ARGS__)
65 #define debug(ctx, ...) log_message(ctx, AM7XXX_LOG_DEBUG, __func__, 0, __VA_ARGS__)
66 #define trace(ctx, ...) log_message(ctx, AM7XXX_LOG_TRACE, NULL, 0, __VA_ARGS__)
67 
68 struct am7xxx_ops {
69  int (*set_power_mode)(am7xxx_device *dev, am7xxx_power_mode power);
70  int (*set_zoom_mode)(am7xxx_device *dev, am7xxx_zoom_mode zoom);
71 };
72 
73 struct am7xxx_usb_device_descriptor {
74  const char *name;
75  uint16_t vendor_id;
76  uint16_t product_id;
77  uint8_t configuration; /* The bConfigurationValue of the device */
78  uint8_t interface_number; /* The bInterfaceNumber of the device */
79  struct am7xxx_ops ops;
80 };
81 
82 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
83 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
84 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
85 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
86 
87 #define DEFAULT_OPS { \
88  .set_power_mode = default_set_power_mode, \
89  .set_zoom_mode = default_set_zoom_mode, \
90 }
91 
92 static const struct am7xxx_usb_device_descriptor supported_devices[] = {
93  {
94  .name = "Acer C110",
95  .vendor_id = 0x1de1,
96  .product_id = 0xc101,
97  .configuration = 2,
98  .interface_number = 0,
99  .ops = DEFAULT_OPS,
100  },
101  {
102  .name = "Acer C112",
103  .vendor_id = 0x1de1,
104  .product_id = 0x5501,
105  .configuration = 2,
106  .interface_number = 0,
107  .ops = DEFAULT_OPS,
108  },
109  {
110  .name ="Aiptek PocketCinema T25",
111  .vendor_id = 0x08ca,
112  .product_id = 0x2144,
113  .configuration = 2,
114  .interface_number = 0,
115  .ops = DEFAULT_OPS,
116  },
117  {
118  .name = "Philips/Sagemcom PicoPix 1020",
119  .vendor_id = 0x21e7,
120  .product_id = 0x000e,
121  .configuration = 2,
122  .interface_number = 0,
123  .ops = DEFAULT_OPS,
124  },
125  {
126  .name = "Philips/Sagemcom PicoPix 2055",
127  .vendor_id = 0x21e7,
128  .product_id = 0x0016,
129  .configuration = 2,
130  .interface_number = 0,
131  .ops = {
132  .set_power_mode = picopix_set_power_mode,
133  .set_zoom_mode = picopix_set_zoom_mode,
134  },
135  },
136  {
137  .name = "Philips/Sagemcom PicoPix 2330",
138  .vendor_id = 0x21e7,
139  .product_id = 0x0019,
140  .configuration = 1,
141  .interface_number = 0,
142  },
143 };
144 
145 /* The header size on the wire is known to be always 24 bytes, regardless of
146  * the memory configuration enforced by different architectures or compilers
147  * for struct am7xxx_header
148  */
149 #define AM7XXX_HEADER_WIRE_SIZE 24
150 
151 struct _am7xxx_device {
152  libusb_device_handle *usb_device;
153  struct libusb_transfer *transfer;
154  int transfer_completed;
155  uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
156  am7xxx_device_info *device_info;
157  am7xxx_context *ctx;
158  const struct am7xxx_usb_device_descriptor *desc;
159  am7xxx_device *next;
160 };
161 
162 struct _am7xxx_context {
163  libusb_context *usb_context;
164  int log_level;
165  am7xxx_device *devices_list;
166 };
167 
168 typedef enum {
169  AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
170  AM7XXX_PACKET_TYPE_IMAGE = 0x02,
171  AM7XXX_PACKET_TYPE_POWER = 0x04,
172  AM7XXX_PACKET_TYPE_ZOOM = 0x05,
173  AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW = 0x15,
174  AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM = 0x16,
175  AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH = 0x17,
176  AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI = 0x18,
177  AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI = 0x19,
178 } am7xxx_packet_type;
179 
180 struct am7xxx_generic_header {
181  uint32_t field0;
182  uint32_t field1;
183  uint32_t field2;
184  uint32_t field3;
185 };
186 
187 struct am7xxx_devinfo_header {
188  uint32_t native_width;
189  uint32_t native_height;
190  uint32_t unknown0;
191  uint32_t unknown1;
192 };
193 
194 struct am7xxx_image_header {
195  uint32_t format;
196  uint32_t width;
197  uint32_t height;
198  uint32_t image_size;
199 };
200 
201 struct am7xxx_power_header {
202  uint32_t bit2;
203  uint32_t bit1;
204  uint32_t bit0;
205 };
206 
207 struct am7xxx_zoom_header {
208  uint32_t bit1;
209  uint32_t bit0;
210 };
211 
212 /*
213  * Examples of packet headers:
214  *
215  * Image header:
216  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
217  *
218  * Power header:
219  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
220  */
221 
222 /* Direction of the communication from the host point of view */
223 #define AM7XXX_DIRECTION_OUT 0 /* host -> device */
224 #define AM7XXX_DIRECTION_IN 1 /* host <- device */
225 
226 struct am7xxx_header {
227  uint32_t packet_type;
228  uint8_t direction;
229  uint8_t header_data_len;
230  uint8_t unknown2;
231  uint8_t unknown3;
232  union {
233  struct am7xxx_generic_header data;
234  struct am7xxx_devinfo_header devinfo;
235  struct am7xxx_image_header image;
236  struct am7xxx_power_header power;
237  struct am7xxx_zoom_header zoom;
238  } header_data;
239 };
240 
241 
242 #ifdef DEBUG
243 static void debug_dump_generic_header(am7xxx_context *ctx, struct am7xxx_generic_header *g)
244 {
245  if (ctx == NULL || g == NULL)
246  return;
247 
248  debug(ctx, "Generic header:\n");
249  debug(ctx, "\tfield0: 0x%08x (%u)\n", g->field0, g->field0);
250  debug(ctx, "\tfield1: 0x%08x (%u)\n", g->field1, g->field1);
251  debug(ctx, "\tfield2: 0x%08x (%u)\n", g->field2, g->field2);
252  debug(ctx, "\tfield3: 0x%08x (%u)\n", g->field3, g->field3);
253 }
254 
255 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
256 {
257  if (ctx == NULL || d == NULL)
258  return;
259 
260  debug(ctx, "Info header:\n");
261  debug(ctx, "\tnative_width: 0x%08x (%u)\n", d->native_width, d->native_width);
262  debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
263  debug(ctx, "\tunknown0: 0x%08x (%u)\n", d->unknown0, d->unknown0);
264  debug(ctx, "\tunknown1: 0x%08x (%u)\n", d->unknown1, d->unknown1);
265 }
266 
267 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
268 {
269  if (ctx == NULL || i == NULL)
270  return;
271 
272  debug(ctx, "Image header:\n");
273  debug(ctx, "\tformat: 0x%08x (%u)\n", i->format, i->format);
274  debug(ctx, "\twidth: 0x%08x (%u)\n", i->width, i->width);
275  debug(ctx, "\theight: 0x%08x (%u)\n", i->height, i->height);
276  debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
277 }
278 
279 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
280 {
281  if (ctx == NULL || p == NULL)
282  return;
283 
284  debug(ctx, "Power header:\n");
285  debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
286  debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
287  debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
288 }
289 
290 static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
291 {
292  if (ctx == NULL || z == NULL)
293  return;
294 
295  debug(ctx, "Zoom header:\n");
296  debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
297  debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
298 }
299 
300 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
301 {
302  if (ctx == NULL || h == NULL)
303  return;
304 
305  debug(ctx, "BEGIN\n");
306  debug(ctx, "packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type);
307  debug(ctx, "direction: 0x%02hhx (%hhu) (%s)\n", h->direction, h->direction,
308  h->direction == AM7XXX_DIRECTION_IN ? "IN" :
309  h->direction == AM7XXX_DIRECTION_OUT ? "OUT" :
310  "UNKNOWN");
311  debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
312  debug(ctx, "unknown2: 0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
313  debug(ctx, "unknown3: 0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
314 
315  switch(h->packet_type) {
316  case AM7XXX_PACKET_TYPE_DEVINFO:
317  debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
318  break;
319 
320  case AM7XXX_PACKET_TYPE_IMAGE:
321  debug_dump_image_header(ctx, &(h->header_data.image));
322  break;
323 
324  case AM7XXX_PACKET_TYPE_POWER:
325  debug_dump_power_header(ctx, &(h->header_data.power));
326  break;
327 
328  case AM7XXX_PACKET_TYPE_ZOOM:
329  debug_dump_zoom_header(ctx, &(h->header_data.zoom));
330  break;
331 
332  default:
333  debug(ctx, "Parsing data not supported for this packet type!\n");
334  debug_dump_generic_header(ctx, &(h->header_data.data));
335  break;
336  }
337  debug(ctx, "END\n\n");
338 }
339 
340 static inline unsigned int in_80chars(unsigned int i)
341 {
342  /* The 3 below is the length of "xx " where xx is the hex string
343  * representation of a byte */
344  return ((i+1) % (80/3));
345 }
346 
347 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
348  uint8_t *buffer, unsigned int len)
349 {
350  unsigned int i;
351 
352  if (ctx == NULL || buffer == NULL || len == 0)
353  return;
354 
355  trace(ctx, "\n");
356  if (message)
357  trace(ctx, "%s\n", message);
358 
359  for (i = 0; i < len; i++) {
360  trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
361  }
362  trace(ctx, "\n");
363 }
364 #else
365 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
366 {
367  (void)ctx;
368  (void)h;
369 }
370 
371 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
372  uint8_t *buffer, unsigned int len)
373 {
374  (void)ctx;
375  (void)message;
376  (void)buffer;
377  (void)len;
378 }
379 #endif /* DEBUG */
380 
381 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
382 {
383  int ret;
384  int transferred = 0;
385 
386  ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
387  if (ret != 0 || (unsigned int)transferred != len) {
388  error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
389  ret, transferred, len);
390  return ret;
391  }
392 
393  trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
394 
395  return 0;
396 }
397 
398 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
399 {
400  int ret;
401  int transferred = 0;
402 
403  trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
404 
405  ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
406  if (ret != 0 || (unsigned int)transferred != len) {
407  error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
408  ret, transferred, len);
409  return ret;
410  }
411 
412  return 0;
413 }
414 
415 static void send_data_async_complete_cb(struct libusb_transfer *transfer)
416 {
417  am7xxx_device *dev = (am7xxx_device *)(transfer->user_data);
418  int *completed = &(dev->transfer_completed);
419  int transferred = transfer->actual_length;
420  int ret;
421 
422  if (transferred != transfer->length) {
423  error(dev->ctx, "transferred: %d (expected %u)\n",
424  transferred, transfer->length);
425  }
426 
427  switch (transfer->status) {
428  case LIBUSB_TRANSFER_COMPLETED:
429  ret = 0;
430  break;
431  case LIBUSB_TRANSFER_TIMED_OUT:
432  ret = LIBUSB_ERROR_TIMEOUT;
433  break;
434  case LIBUSB_TRANSFER_STALL:
435  ret = LIBUSB_ERROR_PIPE;
436  break;
437  case LIBUSB_TRANSFER_OVERFLOW:
438  ret = LIBUSB_ERROR_OVERFLOW;
439  break;
440  case LIBUSB_TRANSFER_NO_DEVICE:
441  ret = LIBUSB_ERROR_NO_DEVICE;
442  break;
443  case LIBUSB_TRANSFER_ERROR:
444  case LIBUSB_TRANSFER_CANCELLED:
445  ret = LIBUSB_ERROR_IO;
446  break;
447  default:
448  error(dev->ctx, "unrecognised status code %d", transfer->status);
449  ret = LIBUSB_ERROR_OTHER;
450  }
451 
452  if (ret < 0)
453  error(dev->ctx, "libusb transfer failed: %s",
454  libusb_error_name(ret));
455 
456  libusb_free_transfer(transfer);
457  transfer = NULL;
458 
459  *completed = 1;
460 }
461 
462 static inline void wait_for_trasfer_completed(am7xxx_device *dev)
463 {
464  while (!dev->transfer_completed) {
465  int ret = libusb_handle_events_completed(dev->ctx->usb_context,
466  &(dev->transfer_completed));
467  if (ret < 0) {
468  if (ret == LIBUSB_ERROR_INTERRUPTED)
469  continue;
470  error(dev->ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
471  libusb_error_name(ret));
472  libusb_cancel_transfer(dev->transfer);
473  continue;
474  }
475  }
476 }
477 
478 static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
479 {
480  int ret;
481  uint8_t *transfer_buffer;
482 
483  dev->transfer = libusb_alloc_transfer(0);
484  if (dev->transfer == NULL) {
485  error(dev->ctx, "cannot allocate transfer (%s)\n",
486  strerror(errno));
487  return -ENOMEM;
488  }
489 
490  /* Make a copy of the buffer so the caller can safely reuse it just
491  * after libusb_submit_transfer() has returned. This technique
492  * requires more allocations than a proper double-buffering approach
493  * but it takes a lot less code. */
494  transfer_buffer = malloc(len);
495  if (transfer_buffer == NULL) {
496  error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
497  strerror(errno));
498  ret = -ENOMEM;
499  goto err;
500  }
501  memcpy(transfer_buffer, buffer, len);
502 
503  dev->transfer->flags |= LIBUSB_TRANSFER_FREE_BUFFER;
504  libusb_fill_bulk_transfer(dev->transfer, dev->usb_device, 0x1,
505  transfer_buffer, len,
506  send_data_async_complete_cb, dev, 0);
507 
508  /* wait for the previous transfer to complete */
509  wait_for_trasfer_completed(dev);
510 
511  trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
512 
513  dev->transfer_completed = 0;
514  ret = libusb_submit_transfer(dev->transfer);
515  if (ret < 0)
516  goto err;
517 
518  return 0;
519 
520 err:
521  libusb_free_transfer(dev->transfer);
522  dev->transfer = NULL;
523  return ret;
524 }
525 
526 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
527 {
528  uint8_t **buffer_iterator = &buffer;
529 
530  put_le32(h->packet_type, buffer_iterator);
531  put_8(h->direction, buffer_iterator);
532  put_8(h->header_data_len, buffer_iterator);
533  put_8(h->unknown2, buffer_iterator);
534  put_8(h->unknown3, buffer_iterator);
535  put_le32(h->header_data.data.field0, buffer_iterator);
536  put_le32(h->header_data.data.field1, buffer_iterator);
537  put_le32(h->header_data.data.field2, buffer_iterator);
538  put_le32(h->header_data.data.field3, buffer_iterator);
539 }
540 
541 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
542 {
543  uint8_t **buffer_iterator = &buffer;
544 
545  h->packet_type = get_le32(buffer_iterator);
546  h->direction = get_8(buffer_iterator);
547  h->header_data_len = get_8(buffer_iterator);
548  h->unknown2 = get_8(buffer_iterator);
549  h->unknown3 = get_8(buffer_iterator);
550  h->header_data.data.field0 = get_le32(buffer_iterator);
551  h->header_data.data.field1 = get_le32(buffer_iterator);
552  h->header_data.data.field2 = get_le32(buffer_iterator);
553  h->header_data.data.field3 = get_le32(buffer_iterator);
554 }
555 
556 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
557 {
558  int ret;
559 
560  ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
561  if (ret < 0)
562  goto out;
563 
564  unserialize_header(dev->buffer, h);
565 
566  if (h->direction == AM7XXX_DIRECTION_IN) {
567  ret = 0;
568  } else {
569  error(dev->ctx,
570  "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
571  h->direction);
572  ret = -EINVAL;
573  }
574 
575  debug_dump_header(dev->ctx, h);
576 
577 out:
578  return ret;
579 }
580 
581 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
582 {
583  int ret;
584 
585  debug_dump_header(dev->ctx, h);
586 
587  /* For symmetry with read_header() we should check here for
588  * h->direction == AM7XXX_DIRECTION_OUT but we just ensure that in all
589  * the callers and save some cycles here.
590  */
591 
592  serialize_header(h, dev->buffer);
593 
594  ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
595  if (ret < 0)
596  error(dev->ctx, "failed to send data\n");
597 
598  return ret;
599 }
600 
601 static int send_command(am7xxx_device *dev, am7xxx_packet_type type)
602 {
603  struct am7xxx_header h = {
604  .packet_type = type,
605  .direction = AM7XXX_DIRECTION_OUT,
606  .header_data_len = 0x00,
607  .unknown2 = 0x3e,
608  .unknown3 = 0x10,
609  .header_data = {
610  .data = {
611  .field0 = 0,
612  .field1 = 0,
613  .field2 = 0,
614  .field3 = 0,
615  },
616  },
617  };
618 
619  return send_header(dev, &h);
620 }
621 
622 
623 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
624  * and print the message unconditionally, this makes it possible to print
625  * fatal messages even early on initialization, before the context has been
626  * set up */
627 static void log_message(am7xxx_context *ctx,
628  int level,
629  const char *function,
630  int line,
631  const char *fmt,
632  ...)
633 {
634  va_list ap;
635 
636  if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
637  if (function) {
638  fprintf(stderr, "%s", function);
639  if (line)
640  fprintf(stderr, "[%d]", line);
641  fprintf(stderr, ": ");
642  }
643 
644  va_start(ap, fmt);
645  vfprintf(stderr, fmt, ap);
646  va_end(ap);
647  }
648 
649  return;
650 }
651 
652 static am7xxx_device *add_new_device(am7xxx_context *ctx,
653  const struct am7xxx_usb_device_descriptor *desc)
654 {
655  am7xxx_device **devices_list;
656  am7xxx_device *new_device;
657 
658  if (ctx == NULL) {
659  fatal("context must not be NULL!\n");
660  return NULL;
661  }
662 
663  new_device = malloc(sizeof(*new_device));
664  if (new_device == NULL) {
665  fatal("cannot allocate a new device (%s)\n", strerror(errno));
666  return NULL;
667  }
668  memset(new_device, 0, sizeof(*new_device));
669 
670  new_device->ctx = ctx;
671  new_device->desc = desc;
672  new_device->transfer_completed = 1;
673 
674  devices_list = &(ctx->devices_list);
675 
676  if (*devices_list == NULL) {
677  *devices_list = new_device;
678  } else {
679  am7xxx_device *prev = *devices_list;
680  while (prev->next)
681  prev = prev->next;
682  prev->next = new_device;
683  }
684  return new_device;
685 }
686 
687 static am7xxx_device *find_device(am7xxx_context *ctx,
688  unsigned int device_index)
689 {
690  unsigned int i = 0;
691  am7xxx_device *current;
692 
693  if (ctx == NULL) {
694  fatal("context must not be NULL!\n");
695  return NULL;
696  }
697 
698  current = ctx->devices_list;
699  while (current && i++ < device_index)
700  current = current->next;
701 
702  return current;
703 }
704 
705 typedef enum {
706  SCAN_OP_BUILD_DEVLIST,
707  SCAN_OP_OPEN_DEVICE,
708 } scan_op;
709 
727 static int scan_devices(am7xxx_context *ctx, scan_op op,
728  unsigned int open_device_index, am7xxx_device **dev)
729 {
730  ssize_t num_devices;
731  libusb_device** list;
732  unsigned int current_index;
733  int i;
734  int ret;
735 
736  if (ctx == NULL) {
737  fatal("context must not be NULL!\n");
738  return -EINVAL;
739  }
740  if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
741  error(ctx, "device scan done already? Abort!\n");
742  return -EINVAL;
743  }
744 
745  num_devices = libusb_get_device_list(ctx->usb_context, &list);
746  if (num_devices < 0) {
747  ret = -ENODEV;
748  goto out;
749  }
750 
751  current_index = 0;
752  for (i = 0; i < num_devices; i++) {
753  struct libusb_device_descriptor desc;
754  unsigned int j;
755 
756  ret = libusb_get_device_descriptor(list[i], &desc);
757  if (ret < 0)
758  continue;
759 
760  for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
761  if (desc.idVendor == supported_devices[j].vendor_id &&
762  desc.idProduct == supported_devices[j].product_id) {
763 
764  if (op == SCAN_OP_BUILD_DEVLIST) {
765  am7xxx_device *new_device;
766  info(ctx, "am7xxx device found, index: %d, name: %s\n",
767  current_index,
768  supported_devices[j].name);
769  new_device = add_new_device(ctx, &supported_devices[j]);
770  if (new_device == NULL) {
771  /* XXX, the caller may want
772  * to call am7xxx_shutdown() if
773  * we fail here, as we may have
774  * added some devices already
775  */
776  debug(ctx, "Cannot create a new device\n");
777  ret = -ENODEV;
778  goto out;
779  }
780  } else if (op == SCAN_OP_OPEN_DEVICE &&
781  current_index == open_device_index) {
782 
783  *dev = find_device(ctx, open_device_index);
784  if (*dev == NULL) {
785  ret = -ENODEV;
786  goto out;
787  }
788 
789  /* the usb device has already been opened */
790  if ((*dev)->usb_device) {
791  debug(ctx, "(*dev)->usb_device already set\n");
792  ret = 1;
793  goto out;
794  }
795 
796  ret = libusb_open(list[i], &((*dev)->usb_device));
797  if (ret < 0) {
798  debug(ctx, "libusb_open failed\n");
799  goto out;
800  }
801 
802  /* XXX, the device is now open, if any
803  * of the calls below fail we need to
804  * close it again before bailing out.
805  */
806 
807  ret = libusb_set_configuration((*dev)->usb_device,
808  (*dev)->desc->configuration);
809  if (ret < 0) {
810  debug(ctx, "libusb_set_configuration failed\n");
811  debug(ctx, "Cannot set configuration %hhu\n",
812  (*dev)->desc->configuration);
813  goto out_libusb_close;
814  }
815 
816  ret = libusb_claim_interface((*dev)->usb_device,
817  (*dev)->desc->interface_number);
818  if (ret < 0) {
819  debug(ctx, "libusb_claim_interface failed\n");
820  debug(ctx, "Cannot claim interface %hhu\n",
821  (*dev)->desc->interface_number);
822 out_libusb_close:
823  libusb_close((*dev)->usb_device);
824  (*dev)->usb_device = NULL;
825  goto out;
826  }
827 
828  goto out;
829  }
830  current_index++;
831  }
832  }
833  }
834 
835  /* if we made it up to here we didn't find any device to open */
836  if (op == SCAN_OP_OPEN_DEVICE) {
837  error(ctx, "Cannot find any device to open\n");
838  ret = -ENODEV;
839  goto out;
840  }
841 
842  /* everything went fine when building the device list */
843  ret = 0;
844 out:
845  libusb_free_device_list(list, 1);
846  return ret;
847 }
848 
849 /* Device specific operations */
850 
851 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
852 {
853  int ret;
854  struct am7xxx_header h = {
855  .packet_type = AM7XXX_PACKET_TYPE_POWER,
856  .direction = AM7XXX_DIRECTION_OUT,
857  .header_data_len = sizeof(struct am7xxx_power_header),
858  .unknown2 = 0x3e,
859  .unknown3 = 0x10,
860  };
861 
862  switch(power) {
863  case AM7XXX_POWER_OFF:
864  h.header_data.power.bit2 = 0;
865  h.header_data.power.bit1 = 0;
866  h.header_data.power.bit0 = 0;
867  break;
868 
869  case AM7XXX_POWER_LOW:
870  h.header_data.power.bit2 = 0;
871  h.header_data.power.bit1 = 0;
872  h.header_data.power.bit0 = 1;
873  break;
874 
875  case AM7XXX_POWER_MIDDLE:
876  h.header_data.power.bit2 = 0;
877  h.header_data.power.bit1 = 1;
878  h.header_data.power.bit0 = 0;
879  break;
880 
881  case AM7XXX_POWER_HIGH:
882  h.header_data.power.bit2 = 0;
883  h.header_data.power.bit1 = 1;
884  h.header_data.power.bit0 = 1;
885  break;
886 
887  case AM7XXX_POWER_TURBO:
888  h.header_data.power.bit2 = 1;
889  h.header_data.power.bit1 = 0;
890  h.header_data.power.bit0 = 0;
891  break;
892 
893  default:
894  error(dev->ctx, "Unsupported power mode.\n");
895  return -EINVAL;
896  };
897 
898  ret = send_header(dev, &h);
899  if (ret < 0)
900  return ret;
901 
902  return 0;
903 }
904 
905 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
906 {
907  switch(power) {
908  case AM7XXX_POWER_LOW:
909  return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW);
910 
911  case AM7XXX_POWER_MIDDLE:
912  return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM);
913 
914  case AM7XXX_POWER_HIGH:
915  return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH);
916 
917  case AM7XXX_POWER_OFF:
918  case AM7XXX_POWER_TURBO:
919  default:
920  error(dev->ctx, "Unsupported power mode.\n");
921  return -EINVAL;
922  };
923 }
924 
925 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
926 {
927  int ret;
928  struct am7xxx_header h = {
929  .packet_type = AM7XXX_PACKET_TYPE_ZOOM,
930  .direction = AM7XXX_DIRECTION_OUT,
931  .header_data_len = sizeof(struct am7xxx_zoom_header),
932  .unknown2 = 0x3e,
933  .unknown3 = 0x10,
934  };
935 
936  switch(zoom) {
938  h.header_data.zoom.bit1 = 0;
939  h.header_data.zoom.bit0 = 0;
940  break;
941 
942  case AM7XXX_ZOOM_H:
943  h.header_data.zoom.bit1 = 0;
944  h.header_data.zoom.bit0 = 1;
945  break;
946 
947  case AM7XXX_ZOOM_H_V:
948  h.header_data.zoom.bit1 = 1;
949  h.header_data.zoom.bit0 = 0;
950  break;
951 
952  case AM7XXX_ZOOM_TEST:
953  h.header_data.zoom.bit1 = 1;
954  h.header_data.zoom.bit0 = 1;
955  break;
956 
957  case AM7XXX_ZOOM_TELE:
958  default:
959  error(dev->ctx, "Unsupported zoom mode.\n");
960  return -EINVAL;
961  };
962 
963  ret = send_header(dev, &h);
964  if (ret < 0)
965  return ret;
966 
967  return 0;
968 }
969 
970 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
971 {
972  int ret;
973  am7xxx_packet_type packet_type;
974 
975  switch(zoom) {
977  packet_type = AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI;
978  break;
979 
980  case AM7XXX_ZOOM_TELE:
981  packet_type = AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI;
982  break;
983 
984  case AM7XXX_ZOOM_H:
985  case AM7XXX_ZOOM_H_V:
986  case AM7XXX_ZOOM_TEST:
987  default:
988  error(dev->ctx, "Unsupported zoom mode.\n");
989  return -EINVAL;
990  };
991 
992  ret = send_command(dev, packet_type);
993  if (ret < 0)
994  return ret;
995 
996  /* The Windows drivers wait for 100ms and send the same command again,
997  * probably to overcome a firmware deficiency */
998  ret = msleep(100);
999  if (ret < 0)
1000  return ret;
1001 
1002  return send_command(dev, packet_type);
1003 }
1004 
1005 /* Public API */
1006 
1007 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
1008 {
1009  int ret;
1010 
1011  *ctx = malloc(sizeof(**ctx));
1012  if (*ctx == NULL) {
1013  fatal("cannot allocate the context (%s)\n", strerror(errno));
1014  ret = -ENOMEM;
1015  goto out;
1016  }
1017  memset(*ctx, 0, sizeof(**ctx));
1018 
1019  /* Set the highest log level during initialization */
1020  (*ctx)->log_level = AM7XXX_LOG_TRACE;
1021 
1022  ret = libusb_init(&((*ctx)->usb_context));
1023  if (ret < 0)
1024  goto out_free_context;
1025 
1026  libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
1027 
1028  ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
1029  if (ret < 0) {
1030  error(*ctx, "scan_devices() failed\n");
1031  am7xxx_shutdown(*ctx);
1032  goto out;
1033  }
1034 
1035  /* Set a quieter log level as default for normal operation */
1036  (*ctx)->log_level = AM7XXX_LOG_ERROR;
1037  return 0;
1038 
1039 out_free_context:
1040  free(*ctx);
1041  *ctx = NULL;
1042 out:
1043  return ret;
1044 }
1045 
1046 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
1047 {
1048  am7xxx_device *current;
1049 
1050  if (ctx == NULL) {
1051  fatal("context must not be NULL!\n");
1052  return;
1053  }
1054 
1055  current = ctx->devices_list;
1056  while (current) {
1057  am7xxx_device *next = current->next;
1058  am7xxx_close_device(current);
1059  free(current->device_info);
1060  free(current);
1061  current = next;
1062  }
1063 
1064  libusb_exit(ctx->usb_context);
1065  free(ctx);
1066  ctx = NULL;
1067 }
1068 
1069 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
1070 {
1071  ctx->log_level = log_level;
1072 }
1073 
1074 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
1075  unsigned int device_index)
1076 {
1077  int ret;
1078 
1079  if (ctx == NULL) {
1080  fatal("context must not be NULL!\n");
1081  return -EINVAL;
1082  }
1083 
1084  ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
1085  if (ret < 0) {
1086  errno = ENODEV;
1087  goto out;
1088  } else if (ret > 0) {
1089  warning(ctx, "device %d already open\n", device_index);
1090  errno = EBUSY;
1091  ret = -EBUSY;
1092  goto out;
1093  }
1094 
1095  /* Philips/Sagemcom PicoPix projectors require that the DEVINFO packet
1096  * is the first one to be sent to the device in order for it to
1097  * successfully return the correct device information.
1098  *
1099  * So, if there is not a cached version of it (from a previous open),
1100  * we ask for device info at open time,
1101  */
1102  if ((*dev)->device_info == NULL) {
1103  ret = am7xxx_get_device_info(*dev, NULL);
1104  if (ret < 0)
1105  error(ctx, "cannot get device info\n");
1106  }
1107 
1108 out:
1109  return ret;
1110 }
1111 
1112 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
1113 {
1114  if (dev == NULL) {
1115  fatal("dev must not be NULL!\n");
1116  return -EINVAL;
1117  }
1118  if (dev->usb_device) {
1119  wait_for_trasfer_completed(dev);
1120  libusb_release_interface(dev->usb_device, dev->desc->interface_number);
1121  libusb_close(dev->usb_device);
1122  dev->usb_device = NULL;
1123  }
1124  return 0;
1125 }
1126 
1127 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
1128  am7xxx_device_info *device_info)
1129 {
1130  int ret;
1131  struct am7xxx_header h;
1132 
1133  if (dev->device_info) {
1134  memcpy(device_info, dev->device_info, sizeof(*device_info));
1135  return 0;
1136  }
1137 
1138  ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
1139  if (ret < 0)
1140  return ret;
1141 
1142  memset(&h, 0, sizeof(h));
1143  ret = read_header(dev, &h);
1144  if (ret < 0)
1145  return ret;
1146 
1147  if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
1148  error(dev->ctx, "expected packet type: %d, got %d instead!\n",
1149  AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
1150  errno = ENOTSUP;
1151  return -ENOTSUP;
1152  }
1153 
1154  dev->device_info = malloc(sizeof(*dev->device_info));
1155  if (dev->device_info == NULL) {
1156  error(dev->ctx, "cannot allocate a device info (%s)\n",
1157  strerror(errno));
1158  return -ENOMEM;
1159  }
1160  memset(dev->device_info, 0, sizeof(*dev->device_info));
1161 
1162  dev->device_info->native_width = h.header_data.devinfo.native_width;
1163  dev->device_info->native_height = h.header_data.devinfo.native_height;
1164 #if 0
1165  /* No reason to expose these in the public API until we know what they mean */
1166  dev->device_info->unknown0 = h.header_data.devinfo.unknown0;
1167  dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
1168 #endif
1169 
1170  return 0;
1171 }
1172 
1174  unsigned int upscale,
1175  unsigned int original_width,
1176  unsigned int original_height,
1177  unsigned int *scaled_width,
1178  unsigned int *scaled_height)
1179 {
1180 
1181  am7xxx_device_info device_info;
1182  float width_ratio;
1183  float height_ratio;
1184  int ret;
1185 
1186  ret = am7xxx_get_device_info(dev, &device_info);
1187  if (ret < 0) {
1188  error(dev->ctx, "cannot get device info\n");
1189  return ret;
1190  }
1191 
1192  /*
1193  * Check if we need to rescale; if the input image fits the native
1194  * dimensions there is no need to, unless we want to upscale.
1195  */
1196  if (!upscale &&
1197  original_width <= device_info.native_width &&
1198  original_height <= device_info.native_height ) {
1199  debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
1200  *scaled_width = original_width;
1201  *scaled_height = original_height;
1202  return 0;
1203  }
1204 
1205  /* Input dimensions relative to the device native dimensions */
1206  width_ratio = (float)original_width / device_info.native_width;
1207  height_ratio = (float)original_height / device_info.native_height;
1208 
1209  if (width_ratio > height_ratio) {
1210  /*
1211  * The input is proportionally "wider" than the device viewport
1212  * so its height needs to be adjusted
1213  */
1214  debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
1215  *scaled_width = device_info.native_width;
1216  *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
1217  } else if (width_ratio < height_ratio) {
1218  /*
1219  * The input is proportionally "taller" than the device viewport
1220  * so its width needs to be adjusted
1221  */
1222  debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
1223  *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
1224  *scaled_height = device_info.native_height;
1225  } else {
1226  debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
1227  *scaled_width = device_info.native_width;
1228  *scaled_height = device_info.native_height;
1229  }
1230  debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
1231 
1232  return 0;
1233 }
1234 
1235 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
1236  am7xxx_image_format format,
1237  unsigned int width,
1238  unsigned int height,
1239  uint8_t *image,
1240  unsigned int image_size)
1241 {
1242  int ret;
1243  struct am7xxx_header h = {
1244  .packet_type = AM7XXX_PACKET_TYPE_IMAGE,
1245  .direction = AM7XXX_DIRECTION_OUT,
1246  .header_data_len = sizeof(struct am7xxx_image_header),
1247  .unknown2 = 0x3e,
1248  .unknown3 = 0x10,
1249  .header_data = {
1250  .image = {
1251  .format = format,
1252  .width = width,
1253  .height = height,
1254  .image_size = image_size,
1255  },
1256  },
1257  };
1258 
1259  ret = send_header(dev, &h);
1260  if (ret < 0)
1261  return ret;
1262 
1263  if (image == NULL || image_size == 0) {
1264  warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1265  return 0;
1266  }
1267 
1268  return send_data(dev, image, image_size);
1269 }
1270 
1271 AM7XXX_PUBLIC int am7xxx_send_image_async(am7xxx_device *dev,
1272  am7xxx_image_format format,
1273  unsigned int width,
1274  unsigned int height,
1275  uint8_t *image,
1276  unsigned int image_size)
1277 {
1278  int ret;
1279  struct am7xxx_header h = {
1280  .packet_type = AM7XXX_PACKET_TYPE_IMAGE,
1281  .direction = AM7XXX_DIRECTION_OUT,
1282  .header_data_len = sizeof(struct am7xxx_image_header),
1283  .unknown2 = 0x3e,
1284  .unknown3 = 0x10,
1285  .header_data = {
1286  .image = {
1287  .format = format,
1288  .width = width,
1289  .height = height,
1290  .image_size = image_size,
1291  },
1292  },
1293  };
1294 
1295  ret = send_header(dev, &h);
1296  if (ret < 0)
1297  return ret;
1298 
1299  if (image == NULL || image_size == 0) {
1300  warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1301  return 0;
1302  }
1303 
1304  return send_data_async(dev, image, image_size);
1305 }
1306 
1308 {
1309  if (dev->desc->ops.set_power_mode == NULL) {
1310  warning(dev->ctx,
1311  "setting power mode is unsupported on this device\n");
1312  return 0;
1313  }
1314 
1315  return dev->desc->ops.set_power_mode(dev, power);
1316 }
1317 
1319 {
1320  if (dev->desc->ops.set_zoom_mode == NULL) {
1321  warning(dev->ctx,
1322  "setting zoom mode is unsupported on this device\n");
1323  return 0;
1324  }
1325 
1326  return dev->desc->ops.set_zoom_mode(dev, zoom);
1327 }
Zoom test screen, the firmware version is shown as well.
Definition: am7xxx.h:126
Zoom 1: H Scale (changes aspect ratio).
Definition: am7xxx.h:124
struct _am7xxx_context am7xxx_context
An opaque data type representing a context.
Definition: am7xxx.h:38
Zoom Tele: available on some PicoPix models.
Definition: am7xxx.h:127
A struct describing device specific properties.
Definition: am7xxx.h:56
int am7xxx_init(am7xxx_context **ctx)
Initialize the library context and data structures, and scan for devices.
Definition: am7xxx.c:1007
Original Size, as retrieved via am7xxx_device_info.
Definition: am7xxx.h:123
Max brightness and power consumption.
Definition: am7xxx.h:104
Middle level of brightness.
Definition: am7xxx.h:102
am7xxx_image_format
The image formats accepted by the device.
Definition: am7xxx.h:80
am7xxx_power_mode
The device power modes.
Definition: am7xxx.h:99
Public libam7xxx API.
int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev, unsigned int device_index)
Open an am7xxx_device according to a index.
Definition: am7xxx.c:1074
Zoom 2: H/V Scale (changes aspect ratio).
Definition: am7xxx.h:125
More brightness, but more power consumption.
Definition: am7xxx.h:103
Error messages, typically they describe API functions failures.
Definition: am7xxx.h:70
int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
Set the power mode of an am7xxx device.
Definition: am7xxx.c:1307
void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
Set verbosity level of log messages.
Definition: am7xxx.c:1069
int am7xxx_get_device_info(am7xxx_device *dev, am7xxx_device_info *device_info)
Get info about an am7xxx device.
Definition: am7xxx.c:1127
int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev, unsigned int upscale, unsigned int original_width, unsigned int original_height, unsigned int *scaled_width, unsigned int *scaled_height)
Calculate the dimensions of an image to be shown on an am7xxx device.
Definition: am7xxx.c:1173
unsigned int native_width
The device native width.
Definition: am7xxx.h:57
int am7xxx_send_image_async(am7xxx_device *dev, am7xxx_image_format format, unsigned int width, unsigned int height, unsigned char *image, unsigned int image_size)
Queue transfer of an image for display on an am7xxx device and return immediately.
am7xxx_zoom_mode
The display zoom modes.
Definition: am7xxx.h:122
int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
Set the zoom mode of an am7xxx device.
Definition: am7xxx.c:1318
Fatal messages, the user application should stop if it gets one of this.
Definition: am7xxx.h:69
Verbose informations about the communication with the hardware.
Definition: am7xxx.h:74
Low power consumption but also low brightness.
Definition: am7xxx.h:101
int am7xxx_send_image(am7xxx_device *dev, am7xxx_image_format format, unsigned int width, unsigned int height, unsigned char *image, unsigned int image_size)
Send an image for display on an am7xxx device.
unsigned int native_height
The device native height.
Definition: am7xxx.h:58
void am7xxx_shutdown(am7xxx_context *ctx)
Cleanup the library data structures and free the context.
Definition: am7xxx.c:1046
am7xxx_log_level
The verbosity level of logging messages.
Definition: am7xxx.h:68
int am7xxx_close_device(am7xxx_device *dev)
Close an am7xxx_device.
Definition: am7xxx.c:1112
struct _am7xxx_device am7xxx_device
An opaque data type representing an am7xxx device.
Definition: am7xxx.h:46
Display is powered off, no image shown.
Definition: am7xxx.h:100