libam7xxx 0.1
Communication library for Actions Micro AM7XXX based USB projectors and DPFs
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/*
34 * If we're not using GNU C, elide __attribute__
35 * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
36 */
37#ifndef __GNUC__
38 #define __attribute__(x) /* NOTHING */
39#endif
40
41/*
42 * Fix printf format when compiling for Windows with MinGW, see:
43 * https://sourceforge.net/p/mingw-w64/wiki2/gnu%20printf/
44 */
45#ifdef __MINGW_PRINTF_FORMAT
46 #define AM7XXX_PRINTF_FORMAT __MINGW_PRINTF_FORMAT
47#else
48 #define AM7XXX_PRINTF_FORMAT printf
49#endif
50
51/* Control shared library symbols visibility */
52#if defined _WIN32 || defined __CYGWIN__
53 #define AM7XXX_PUBLIC __declspec(dllexport)
54 #define AM7XXX_LOCAL
55#else
56 #if __GNUC__ >= 4
57 #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
58 #define AM7XXX_LOCAL __attribute__ ((visibility ("hidden")))
59 #else
60 #define AM7XXX_PUBLIC
61 #define AM7XXX_LOCAL
62 #endif
63#endif
64
65static void log_message(am7xxx_context *ctx,
66 int level,
67 const char *function_name,
68 int line,
69 const char *fmt,
70 ...) __attribute__ ((format (AM7XXX_PRINTF_FORMAT, 5, 6)));
71
72#define fatal(...) log_message(NULL, AM7XXX_LOG_FATAL, __func__, __LINE__, __VA_ARGS__)
73#define error(ctx, ...) log_message(ctx, AM7XXX_LOG_ERROR, __func__, __LINE__, __VA_ARGS__)
74#define warning(ctx, ...) log_message(ctx, AM7XXX_LOG_WARNING, __func__, 0, __VA_ARGS__)
75#define info(ctx, ...) log_message(ctx, AM7XXX_LOG_INFO, __func__, 0, __VA_ARGS__)
76#define debug(ctx, ...) log_message(ctx, AM7XXX_LOG_DEBUG, __func__, 0, __VA_ARGS__)
77#define trace(ctx, ...) log_message(ctx, AM7XXX_LOG_TRACE, NULL, 0, __VA_ARGS__)
78
79struct am7xxx_ops {
80 int (*set_power_mode)(am7xxx_device *dev, am7xxx_power_mode power);
81 int (*set_zoom_mode)(am7xxx_device *dev, am7xxx_zoom_mode zoom);
82};
83
84struct am7xxx_usb_device_descriptor {
85 const char *name;
86 uint16_t vendor_id;
87 uint16_t product_id;
88 uint8_t configuration; /* The bConfigurationValue of the device */
89 uint8_t interface_number; /* The bInterfaceNumber of the device */
90 struct am7xxx_ops ops;
91};
92
93static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
94static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
95static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
96static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
97
98#define DEFAULT_OPS { \
99 .set_power_mode = default_set_power_mode, \
100 .set_zoom_mode = default_set_zoom_mode, \
101}
102
103static const struct am7xxx_usb_device_descriptor supported_devices[] = {
104 {
105 .name = "Acer C110",
106 .vendor_id = 0x1de1,
107 .product_id = 0xc101,
108 .configuration = 2,
109 .interface_number = 0,
110 .ops = DEFAULT_OPS,
111 },
112 {
113 .name = "Acer C112",
114 .vendor_id = 0x1de1,
115 .product_id = 0x5501,
116 .configuration = 2,
117 .interface_number = 0,
118 .ops = DEFAULT_OPS,
119 },
120 {
121 .name ="Aiptek PocketCinema T25",
122 .vendor_id = 0x08ca,
123 .product_id = 0x2144,
124 .configuration = 2,
125 .interface_number = 0,
126 .ops = DEFAULT_OPS,
127 },
128 {
129 .name = "Philips/Sagemcom PicoPix 1020",
130 .vendor_id = 0x21e7,
131 .product_id = 0x000e,
132 .configuration = 2,
133 .interface_number = 0,
134 .ops = DEFAULT_OPS,
135 },
136 {
137 .name = "Philips/Sagemcom PicoPix 2055",
138 .vendor_id = 0x21e7,
139 .product_id = 0x0016,
140 .configuration = 2,
141 .interface_number = 0,
142 .ops = {
143 .set_power_mode = picopix_set_power_mode,
144 .set_zoom_mode = picopix_set_zoom_mode,
145 },
146 },
147 {
148 .name = "Philips/Sagemcom PicoPix 2330",
149 .vendor_id = 0x21e7,
150 .product_id = 0x0019,
151 .configuration = 1,
152 .interface_number = 0,
153 },
154};
155
156/* The header size on the wire is known to be always 24 bytes, regardless of
157 * the memory configuration enforced by different architectures or compilers
158 * for struct am7xxx_header
159 */
160#define AM7XXX_HEADER_WIRE_SIZE 24
161
162struct _am7xxx_device {
163 libusb_device_handle *usb_device;
164 struct libusb_transfer *transfer;
165 int transfer_completed;
166 uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
167 am7xxx_device_info *device_info;
168 am7xxx_context *ctx;
169 const struct am7xxx_usb_device_descriptor *desc;
170 am7xxx_device *next;
171};
172
173struct _am7xxx_context {
174 libusb_context *usb_context;
175 int log_level;
176 am7xxx_device *devices_list;
177};
178
179typedef enum {
180 AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
181 AM7XXX_PACKET_TYPE_IMAGE = 0x02,
182 AM7XXX_PACKET_TYPE_POWER = 0x04,
183 AM7XXX_PACKET_TYPE_ZOOM = 0x05,
184 AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW = 0x15,
185 AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM = 0x16,
186 AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH = 0x17,
187 AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI = 0x18,
188 AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI = 0x19,
189} am7xxx_packet_type;
190
191struct am7xxx_generic_header {
192 uint32_t field0;
193 uint32_t field1;
194 uint32_t field2;
195 uint32_t field3;
196};
197
198struct am7xxx_devinfo_header {
199 uint32_t native_width;
200 uint32_t native_height;
201 uint32_t unknown0;
202 uint32_t unknown1;
203};
204
205struct am7xxx_image_header {
206 uint32_t format;
207 uint32_t width;
208 uint32_t height;
209 uint32_t image_size;
210};
211
212struct am7xxx_power_header {
213 uint32_t bit2;
214 uint32_t bit1;
215 uint32_t bit0;
216};
217
218struct am7xxx_zoom_header {
219 uint32_t bit1;
220 uint32_t bit0;
221};
222
223/*
224 * Examples of packet headers:
225 *
226 * Image header:
227 * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
228 *
229 * Power header:
230 * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
231 */
232
233/* Direction of the communication from the host point of view */
234#define AM7XXX_DIRECTION_OUT 0 /* host -> device */
235#define AM7XXX_DIRECTION_IN 1 /* host <- device */
236
237struct am7xxx_header {
238 uint32_t packet_type;
239 uint8_t direction;
240 uint8_t header_data_len;
241 uint8_t unknown2;
242 uint8_t unknown3;
243 union {
244 struct am7xxx_generic_header data;
245 struct am7xxx_devinfo_header devinfo;
246 struct am7xxx_image_header image;
247 struct am7xxx_power_header power;
248 struct am7xxx_zoom_header zoom;
249 } header_data;
250};
251
252
253#ifdef DEBUG
254static void debug_dump_generic_header(am7xxx_context *ctx, struct am7xxx_generic_header *g)
255{
256 if (ctx == NULL || g == NULL)
257 return;
258
259 debug(ctx, "Generic header:\n");
260 debug(ctx, "\tfield0: 0x%08x (%u)\n", g->field0, g->field0);
261 debug(ctx, "\tfield1: 0x%08x (%u)\n", g->field1, g->field1);
262 debug(ctx, "\tfield2: 0x%08x (%u)\n", g->field2, g->field2);
263 debug(ctx, "\tfield3: 0x%08x (%u)\n", g->field3, g->field3);
264}
265
266static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
267{
268 if (ctx == NULL || d == NULL)
269 return;
270
271 debug(ctx, "Info header:\n");
272 debug(ctx, "\tnative_width: 0x%08x (%u)\n", d->native_width, d->native_width);
273 debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
274 debug(ctx, "\tunknown0: 0x%08x (%u)\n", d->unknown0, d->unknown0);
275 debug(ctx, "\tunknown1: 0x%08x (%u)\n", d->unknown1, d->unknown1);
276}
277
278static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
279{
280 if (ctx == NULL || i == NULL)
281 return;
282
283 debug(ctx, "Image header:\n");
284 debug(ctx, "\tformat: 0x%08x (%u)\n", i->format, i->format);
285 debug(ctx, "\twidth: 0x%08x (%u)\n", i->width, i->width);
286 debug(ctx, "\theight: 0x%08x (%u)\n", i->height, i->height);
287 debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
288}
289
290static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
291{
292 if (ctx == NULL || p == NULL)
293 return;
294
295 debug(ctx, "Power header:\n");
296 debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
297 debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
298 debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
299}
300
301static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
302{
303 if (ctx == NULL || z == NULL)
304 return;
305
306 debug(ctx, "Zoom header:\n");
307 debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
308 debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
309}
310
311static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
312{
313 if (ctx == NULL || h == NULL)
314 return;
315
316 debug(ctx, "BEGIN\n");
317 debug(ctx, "packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type);
318 debug(ctx, "direction: 0x%02hhx (%hhu) (%s)\n", h->direction, h->direction,
319 h->direction == AM7XXX_DIRECTION_IN ? "IN" :
320 h->direction == AM7XXX_DIRECTION_OUT ? "OUT" :
321 "UNKNOWN");
322 debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
323 debug(ctx, "unknown2: 0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
324 debug(ctx, "unknown3: 0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
325
326 switch(h->packet_type) {
327 case AM7XXX_PACKET_TYPE_DEVINFO:
328 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
329 break;
330
331 case AM7XXX_PACKET_TYPE_IMAGE:
332 debug_dump_image_header(ctx, &(h->header_data.image));
333 break;
334
335 case AM7XXX_PACKET_TYPE_POWER:
336 debug_dump_power_header(ctx, &(h->header_data.power));
337 break;
338
339 case AM7XXX_PACKET_TYPE_ZOOM:
340 debug_dump_zoom_header(ctx, &(h->header_data.zoom));
341 break;
342
343 default:
344 debug(ctx, "Parsing data not supported for this packet type!\n");
345 debug_dump_generic_header(ctx, &(h->header_data.data));
346 break;
347 }
348 debug(ctx, "END\n\n");
349}
350
351static inline unsigned int in_80chars(unsigned int i)
352{
353 /* The 3 below is the length of "xx " where xx is the hex string
354 * representation of a byte */
355 return ((i + 1) % (80 / 3));
356}
357
358static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
359 uint8_t *buffer, unsigned int len)
360{
361 unsigned int i;
362
363 if (ctx == NULL || buffer == NULL || len == 0)
364 return;
365
366 trace(ctx, "\n");
367 if (message)
368 trace(ctx, "%s\n", message);
369
370 for (i = 0; i < len; i++) {
371 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
372 }
373 trace(ctx, "\n");
374}
375#else
376static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
377{
378 (void)ctx;
379 (void)h;
380}
381
382static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
383 uint8_t *buffer, unsigned int len)
384{
385 (void)ctx;
386 (void)message;
387 (void)buffer;
388 (void)len;
389}
390#endif /* DEBUG */
391
392static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
393{
394 int ret;
395 int transferred;
396
397 transferred = 0;
398 ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
399 if (ret != 0 || (unsigned int)transferred != len) {
400 error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
401 libusb_error_name(ret), transferred, len);
402 return ret;
403 }
404
405 trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
406
407 return 0;
408}
409
410static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
411{
412 int ret;
413 int transferred;
414
415 trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
416
417 transferred = 0;
418 ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
419 if (ret != 0 || (unsigned int)transferred != len) {
420 error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
421 libusb_error_name(ret), transferred, len);
422 return ret;
423 }
424
425 return 0;
426}
427
428static void LIBUSB_CALL send_data_async_complete_cb(struct libusb_transfer *transfer)
429{
430 am7xxx_device *dev = (am7xxx_device *)(transfer->user_data);
431 int *completed = &(dev->transfer_completed);
432 int transferred = transfer->actual_length;
433 int ret;
434
435 if (transferred != transfer->length) {
436 error(dev->ctx, "transferred: %d (expected %u)\n",
437 transferred, transfer->length);
438 }
439
440 switch (transfer->status) {
441 case LIBUSB_TRANSFER_COMPLETED:
442 ret = 0;
443 break;
444 case LIBUSB_TRANSFER_TIMED_OUT:
445 ret = LIBUSB_ERROR_TIMEOUT;
446 break;
447 case LIBUSB_TRANSFER_STALL:
448 ret = LIBUSB_ERROR_PIPE;
449 break;
450 case LIBUSB_TRANSFER_OVERFLOW:
451 ret = LIBUSB_ERROR_OVERFLOW;
452 break;
453 case LIBUSB_TRANSFER_NO_DEVICE:
454 ret = LIBUSB_ERROR_NO_DEVICE;
455 break;
456 case LIBUSB_TRANSFER_ERROR:
457 case LIBUSB_TRANSFER_CANCELLED:
458 ret = LIBUSB_ERROR_IO;
459 break;
460 default:
461 error(dev->ctx, "unrecognised status code %d", transfer->status);
462 ret = LIBUSB_ERROR_OTHER;
463 }
464
465 if (ret < 0)
466 error(dev->ctx, "libusb transfer failed: %s",
467 libusb_error_name(ret));
468
469 libusb_free_transfer(transfer);
470 transfer = NULL;
471
472 *completed = 1;
473}
474
475static inline void wait_for_trasfer_completed(am7xxx_device *dev)
476{
477 while (!dev->transfer_completed) {
478 int ret = libusb_handle_events_completed(dev->ctx->usb_context,
479 &(dev->transfer_completed));
480 if (ret < 0) {
481 if (ret == LIBUSB_ERROR_INTERRUPTED)
482 continue;
483 error(dev->ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
484 libusb_error_name(ret));
485 libusb_cancel_transfer(dev->transfer);
486 continue;
487 }
488 }
489}
490
491static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
492{
493 int ret;
494 uint8_t *transfer_buffer;
495
496 dev->transfer = libusb_alloc_transfer(0);
497 if (dev->transfer == NULL) {
498 error(dev->ctx, "cannot allocate transfer (%s)\n",
499 strerror(errno));
500 return -ENOMEM;
501 }
502
503 /* Make a copy of the buffer so the caller can safely reuse it just
504 * after libusb_submit_transfer() has returned. This technique
505 * requires more dynamic allocations compared to a proper
506 * double-buffering approach but it takes a lot less code. */
507 transfer_buffer = malloc(len);
508 if (transfer_buffer == NULL) {
509 error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
510 strerror(errno));
511 ret = -ENOMEM;
512 goto err;
513 }
514 memcpy(transfer_buffer, buffer, len);
515
516 dev->transfer->flags |= LIBUSB_TRANSFER_FREE_BUFFER;
517 libusb_fill_bulk_transfer(dev->transfer, dev->usb_device, 0x1,
518 transfer_buffer, len,
519 send_data_async_complete_cb, dev, 0);
520
521 /* wait for the previous transfer to complete */
522 wait_for_trasfer_completed(dev);
523
524 trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
525
526 dev->transfer_completed = 0;
527 ret = libusb_submit_transfer(dev->transfer);
528 if (ret < 0)
529 goto err;
530
531 return 0;
532
533err:
534 libusb_free_transfer(dev->transfer);
535 dev->transfer = NULL;
536 return ret;
537}
538
539static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
540{
541 uint8_t **buffer_iterator = &buffer;
542
543 put_le32(h->packet_type, buffer_iterator);
544 put_8(h->direction, buffer_iterator);
545 put_8(h->header_data_len, buffer_iterator);
546 put_8(h->unknown2, buffer_iterator);
547 put_8(h->unknown3, buffer_iterator);
548 put_le32(h->header_data.data.field0, buffer_iterator);
549 put_le32(h->header_data.data.field1, buffer_iterator);
550 put_le32(h->header_data.data.field2, buffer_iterator);
551 put_le32(h->header_data.data.field3, buffer_iterator);
552}
553
554static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
555{
556 uint8_t **buffer_iterator = &buffer;
557
558 h->packet_type = get_le32(buffer_iterator);
559 h->direction = get_8(buffer_iterator);
560 h->header_data_len = get_8(buffer_iterator);
561 h->unknown2 = get_8(buffer_iterator);
562 h->unknown3 = get_8(buffer_iterator);
563 h->header_data.data.field0 = get_le32(buffer_iterator);
564 h->header_data.data.field1 = get_le32(buffer_iterator);
565 h->header_data.data.field2 = get_le32(buffer_iterator);
566 h->header_data.data.field3 = get_le32(buffer_iterator);
567}
568
569static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
570{
571 int ret;
572
573 ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
574 if (ret < 0)
575 goto out;
576
577 unserialize_header(dev->buffer, h);
578
579 if (h->direction == AM7XXX_DIRECTION_IN) {
580 ret = 0;
581 } else {
582 error(dev->ctx,
583 "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
584 h->direction);
585 ret = -EINVAL;
586 }
587
588 debug_dump_header(dev->ctx, h);
589
590out:
591 return ret;
592}
593
594static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
595{
596 int ret;
597
598 debug_dump_header(dev->ctx, h);
599
600 /* For symmetry with read_header() we should check here for
601 * h->direction == AM7XXX_DIRECTION_OUT but we just ensure that in all
602 * the callers and save some cycles here.
603 */
604
605 serialize_header(h, dev->buffer);
606
607 ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
608 if (ret < 0)
609 error(dev->ctx, "failed to send data\n");
610
611 return ret;
612}
613
614static int send_command(am7xxx_device *dev, am7xxx_packet_type type)
615{
616 struct am7xxx_header h = {
617 .packet_type = type,
618 .direction = AM7XXX_DIRECTION_OUT,
619 .header_data_len = 0x00,
620 .unknown2 = 0x3e,
621 .unknown3 = 0x10,
622 .header_data = {
623 .data = {
624 .field0 = 0,
625 .field1 = 0,
626 .field2 = 0,
627 .field3 = 0,
628 },
629 },
630 };
631
632 return send_header(dev, &h);
633}
634
635
636/* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
637 * and print the message unconditionally, this makes it possible to print
638 * fatal messages even early on initialization, before the context has been
639 * set up */
640static void log_message(am7xxx_context *ctx,
641 int level,
642 const char *function_name,
643 int line,
644 const char *fmt,
645 ...)
646{
647 va_list ap;
648
649 if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
650 if (function_name) {
651 fprintf(stderr, "%s", function_name);
652 if (line)
653 fprintf(stderr, "[%d]", line);
654 fprintf(stderr, ": ");
655 }
656
657 va_start(ap, fmt);
658 vfprintf(stderr, fmt, ap);
659 va_end(ap);
660 }
661
662 return;
663}
664
665static am7xxx_device *add_new_device(am7xxx_context *ctx,
666 const struct am7xxx_usb_device_descriptor *desc)
667{
668 am7xxx_device **devices_list;
669 am7xxx_device *new_device;
670
671 if (ctx == NULL) {
672 fatal("context must not be NULL!\n");
673 return NULL;
674 }
675
676 new_device = malloc(sizeof(*new_device));
677 if (new_device == NULL) {
678 debug(ctx, "cannot allocate a new device (%s)\n", strerror(errno));
679 return NULL;
680 }
681 memset(new_device, 0, sizeof(*new_device));
682
683 new_device->ctx = ctx;
684 new_device->desc = desc;
685 new_device->transfer_completed = 1;
686
687 devices_list = &(ctx->devices_list);
688
689 if (*devices_list == NULL) {
690 *devices_list = new_device;
691 } else {
692 am7xxx_device *prev = *devices_list;
693 while (prev->next)
694 prev = prev->next;
695 prev->next = new_device;
696 }
697 return new_device;
698}
699
700static am7xxx_device *find_device(am7xxx_context *ctx,
701 unsigned int device_index)
702{
703 unsigned int i = 0;
704 am7xxx_device *current;
705
706 if (ctx == NULL) {
707 fatal("context must not be NULL!\n");
708 return NULL;
709 }
710
711 current = ctx->devices_list;
712 while (current && i++ < device_index)
713 current = current->next;
714
715 return current;
716}
717
718static int open_device(am7xxx_context *ctx,
719 unsigned int device_index,
720 libusb_device *usb_dev,
721 am7xxx_device **dev)
722{
723 int ret;
724 int current_configuration;
725
726 *dev = find_device(ctx, device_index);
727 if (*dev == NULL) {
728 ret = -ENODEV;
729 goto out;
730 }
731
732 /* the usb device has already been opened */
733 if ((*dev)->usb_device) {
734 ret = 1;
735 goto out;
736 }
737
738 ret = libusb_open(usb_dev, &((*dev)->usb_device));
739 if (ret < 0) {
740 debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret));
741 goto out;
742 }
743
744 /* XXX, the device is now open, if any of the calls below fail we need
745 * to close it again before bailing out.
746 */
747
748 current_configuration = -1;
749 ret = libusb_get_configuration((*dev)->usb_device,
750 &current_configuration);
751 if (ret < 0) {
752 debug(ctx, "libusb_get_configuration failed: %s\n",
753 libusb_error_name(ret));
754 goto out_libusb_close;
755 }
756
757 if (current_configuration != (*dev)->desc->configuration) {
758 /*
759 * In principle, before setting a new configuration, kernel
760 * drivers should be detached from _all_ interfaces; for
761 * example calling something like the following "invented"
762 * function _before_ setting the new configuration:
763 *
764 * libusb_detach_all_kernel_drivers((*dev)->usb_device);
765 *
766 * However, in practice, this is not necessary for most
767 * devices as they have only one configuration.
768 *
769 * When a device only has one configuration:
770 *
771 * - if there was a kernel driver bound to the device, it
772 * had already set the configuration and the call below
773 * will be skipped;
774 *
775 * - if no kernel driver was bound to the device, the call
776 * below will suceed.
777 */
778 ret = libusb_set_configuration((*dev)->usb_device,
779 (*dev)->desc->configuration);
780 if (ret < 0) {
781 debug(ctx, "libusb_set_configuration failed: %s\n",
782 libusb_error_name(ret));
783 debug(ctx, "Cannot set configuration %hhu\n",
784 (*dev)->desc->configuration);
785 goto out_libusb_close;
786 }
787 }
788
789 libusb_set_auto_detach_kernel_driver((*dev)->usb_device, 1);
790
791 ret = libusb_claim_interface((*dev)->usb_device,
792 (*dev)->desc->interface_number);
793 if (ret < 0) {
794 debug(ctx, "libusb_claim_interface failed: %s\n",
795 libusb_error_name(ret));
796 debug(ctx, "Cannot claim interface %hhu\n",
797 (*dev)->desc->interface_number);
798 goto out_libusb_close;
799 }
800
801 /* Checking that the configuration has not changed, as suggested in
802 * http://libusb.sourceforge.net/api-1.0/caveats.html
803 */
804 current_configuration = -1;
805 ret = libusb_get_configuration((*dev)->usb_device,
806 &current_configuration);
807 if (ret < 0) {
808 debug(ctx, "libusb_get_configuration after claim failed: %s\n",
809 libusb_error_name(ret));
810 goto out_libusb_release_interface;
811 }
812
813 if (current_configuration != (*dev)->desc->configuration) {
814 debug(ctx, "libusb configuration changed (expected: %hhu, current: %d)\n",
815 (*dev)->desc->configuration, current_configuration);
816 ret = -EINVAL;
817 goto out_libusb_release_interface;
818 }
819out:
820 return ret;
821
822out_libusb_release_interface:
823 libusb_release_interface((*dev)->usb_device,
824 (*dev)->desc->interface_number);
825out_libusb_close:
826 libusb_close((*dev)->usb_device);
827 (*dev)->usb_device = NULL;
828 return ret;
829}
830
831typedef enum {
832 SCAN_OP_BUILD_DEVLIST,
833 SCAN_OP_OPEN_DEVICE,
834} scan_op;
835
854static int scan_devices(am7xxx_context *ctx, scan_op op,
855 unsigned int open_device_index, am7xxx_device **dev)
856{
857 ssize_t num_devices;
858 libusb_device **list;
859 unsigned int current_index;
860 int i;
861 int ret;
862
863 if (ctx == NULL) {
864 fatal("context must not be NULL!\n");
865 return -EINVAL;
866 }
867 if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
868 error(ctx, "device scan done already? Abort!\n");
869 return -EINVAL;
870 }
871
872 num_devices = libusb_get_device_list(ctx->usb_context, &list);
873 if (num_devices < 0) {
874 ret = -ENODEV;
875 goto out;
876 }
877
878 current_index = 0;
879 for (i = 0; i < num_devices; i++) {
880 struct libusb_device_descriptor desc;
881 unsigned int j;
882
883 ret = libusb_get_device_descriptor(list[i], &desc);
884 if (ret < 0)
885 continue;
886
887 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
888 if (desc.idVendor == supported_devices[j].vendor_id &&
889 desc.idProduct == supported_devices[j].product_id) {
890
891 if (op == SCAN_OP_BUILD_DEVLIST) {
892 am7xxx_device *new_device;
893 info(ctx, "am7xxx device found, index: %d, name: %s\n",
894 current_index,
895 supported_devices[j].name);
896 new_device = add_new_device(ctx, &supported_devices[j]);
897 if (new_device == NULL) {
898 /* XXX, the caller may want
899 * to call am7xxx_shutdown() if
900 * we fail here, as we may have
901 * added some devices already
902 */
903 debug(ctx, "Cannot create a new device\n");
904 ret = -ENODEV;
905 goto out;
906 }
907 } else if (op == SCAN_OP_OPEN_DEVICE &&
908 current_index == open_device_index) {
909
910 ret = open_device(ctx,
911 open_device_index,
912 list[i],
913 dev);
914 if (ret < 0)
915 debug(ctx, "open_device failed\n");
916
917 /* exit the loop unconditionally after
918 * attempting to open the device
919 * requested by the user */
920 goto out;
921 }
922 current_index++;
923 }
924 }
925 }
926
927 /* if we made it up to here when op == SCAN_OP_OPEN_DEVICE,
928 * no devices to open had been found. */
929 if (op == SCAN_OP_OPEN_DEVICE) {
930 error(ctx, "Cannot find any device to open\n");
931 ret = -ENODEV;
932 goto out;
933 }
934
935 /* everything went fine when building the device list */
936 ret = 0;
937out:
938 libusb_free_device_list(list, 1);
939 return ret;
940}
941
942/* Device specific operations */
943
944static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
945{
946 int ret;
947 struct am7xxx_header h = {
948 .packet_type = AM7XXX_PACKET_TYPE_POWER,
949 .direction = AM7XXX_DIRECTION_OUT,
950 .header_data_len = sizeof(struct am7xxx_power_header),
951 .unknown2 = 0x3e,
952 .unknown3 = 0x10,
953 };
954
955 switch(power) {
956 case AM7XXX_POWER_OFF:
957 h.header_data.power.bit2 = 0;
958 h.header_data.power.bit1 = 0;
959 h.header_data.power.bit0 = 0;
960 break;
961
962 case AM7XXX_POWER_LOW:
963 h.header_data.power.bit2 = 0;
964 h.header_data.power.bit1 = 0;
965 h.header_data.power.bit0 = 1;
966 break;
967
969 h.header_data.power.bit2 = 0;
970 h.header_data.power.bit1 = 1;
971 h.header_data.power.bit0 = 0;
972 break;
973
975 h.header_data.power.bit2 = 0;
976 h.header_data.power.bit1 = 1;
977 h.header_data.power.bit0 = 1;
978 break;
979
981 h.header_data.power.bit2 = 1;
982 h.header_data.power.bit1 = 0;
983 h.header_data.power.bit0 = 0;
984 break;
985
986 default:
987 error(dev->ctx, "Unsupported power mode.\n");
988 return -EINVAL;
989 };
990
991 ret = send_header(dev, &h);
992 if (ret < 0)
993 return ret;
994
995 return 0;
996}
997
998static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
999{
1000 switch(power) {
1001 case AM7XXX_POWER_LOW:
1002 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW);
1003
1005 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM);
1006
1007 case AM7XXX_POWER_HIGH:
1008 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH);
1009
1010 case AM7XXX_POWER_OFF:
1011 case AM7XXX_POWER_TURBO:
1012 default:
1013 error(dev->ctx, "Unsupported power mode.\n");
1014 return -EINVAL;
1015 };
1016}
1017
1018static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1019{
1020 int ret;
1021 struct am7xxx_header h = {
1022 .packet_type = AM7XXX_PACKET_TYPE_ZOOM,
1023 .direction = AM7XXX_DIRECTION_OUT,
1024 .header_data_len = sizeof(struct am7xxx_zoom_header),
1025 .unknown2 = 0x3e,
1026 .unknown3 = 0x10,
1027 };
1028
1029 switch(zoom) {
1031 h.header_data.zoom.bit1 = 0;
1032 h.header_data.zoom.bit0 = 0;
1033 break;
1034
1035 case AM7XXX_ZOOM_H:
1036 h.header_data.zoom.bit1 = 0;
1037 h.header_data.zoom.bit0 = 1;
1038 break;
1039
1040 case AM7XXX_ZOOM_H_V:
1041 h.header_data.zoom.bit1 = 1;
1042 h.header_data.zoom.bit0 = 0;
1043 break;
1044
1045 case AM7XXX_ZOOM_TEST:
1046 h.header_data.zoom.bit1 = 1;
1047 h.header_data.zoom.bit0 = 1;
1048 break;
1049
1050 case AM7XXX_ZOOM_TELE:
1051 default:
1052 error(dev->ctx, "Unsupported zoom mode.\n");
1053 return -EINVAL;
1054 };
1055
1056 ret = send_header(dev, &h);
1057 if (ret < 0)
1058 return ret;
1059
1060 return 0;
1061}
1062
1063static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1064{
1065 int ret;
1066 am7xxx_packet_type packet_type;
1067
1068 switch(zoom) {
1070 packet_type = AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI;
1071 break;
1072
1073 case AM7XXX_ZOOM_TELE:
1074 packet_type = AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI;
1075 break;
1076
1077 case AM7XXX_ZOOM_H:
1078 case AM7XXX_ZOOM_H_V:
1079 case AM7XXX_ZOOM_TEST:
1080 default:
1081 error(dev->ctx, "Unsupported zoom mode.\n");
1082 return -EINVAL;
1083 };
1084
1085 ret = send_command(dev, packet_type);
1086 if (ret < 0)
1087 return ret;
1088
1089 /* The Windows drivers wait for 100ms and send the same command again,
1090 * probably to overcome a firmware deficiency */
1091 ret = msleep(100);
1092 if (ret < 0)
1093 return ret;
1094
1095 return send_command(dev, packet_type);
1096}
1097
1098/* Public API */
1099
1100AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
1101{
1102 int ret;
1103
1104 *ctx = malloc(sizeof(**ctx));
1105 if (*ctx == NULL) {
1106 fatal("cannot allocate the context (%s)\n", strerror(errno));
1107 return -ENOMEM;
1108 }
1109 memset(*ctx, 0, sizeof(**ctx));
1110
1111 /* Set the highest log level during initialization */
1112 (*ctx)->log_level = AM7XXX_LOG_TRACE;
1113
1114 ret = libusb_init(&((*ctx)->usb_context));
1115 if (ret < 0) {
1116 error(*ctx, "libusb_init failed: %s\n", libusb_error_name(ret));
1117 goto out_free_context;
1118 }
1119
1120 libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
1121
1122 ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
1123 if (ret < 0) {
1124 error(*ctx, "scan_devices() failed\n");
1125 am7xxx_shutdown(*ctx);
1126 goto out;
1127 }
1128
1129 /* Set a quieter log level as default for normal operation */
1130 (*ctx)->log_level = AM7XXX_LOG_ERROR;
1131 return 0;
1132
1133out_free_context:
1134 free(*ctx);
1135 *ctx = NULL;
1136out:
1137 return ret;
1138}
1139
1140AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
1141{
1142 am7xxx_device *current;
1143
1144 if (ctx == NULL) {
1145 fatal("context must not be NULL!\n");
1146 return;
1147 }
1148
1149 current = ctx->devices_list;
1150 while (current) {
1151 am7xxx_device *next = current->next;
1152 am7xxx_close_device(current);
1153 free(current->device_info);
1154 free(current);
1155 current = next;
1156 }
1157
1158 libusb_exit(ctx->usb_context);
1159 free(ctx);
1160 ctx = NULL;
1161}
1162
1163AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
1164{
1165 ctx->log_level = log_level;
1166}
1167
1169 unsigned int device_index)
1170{
1171 int ret;
1172
1173 if (ctx == NULL) {
1174 fatal("context must not be NULL!\n");
1175 return -EINVAL;
1176 }
1177
1178 ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
1179 if (ret < 0) {
1180 errno = ENODEV;
1181 goto out;
1182 } else if (ret > 0) {
1183 warning(ctx, "device %d already open\n", device_index);
1184 errno = EBUSY;
1185 ret = -EBUSY;
1186 goto out;
1187 }
1188
1189 /* Philips/Sagemcom PicoPix projectors require that the DEVINFO packet
1190 * is the first one to be sent to the device in order for it to
1191 * successfully return the correct device information.
1192 *
1193 * NOTE: am7xxx_get_device_info() will fetch the actual device info
1194 * from the device only the very first time it's called for a given
1195 * device, otherwise, it'll return a cached version of the device info
1196 * (from a previous call to am7xxx_open_device(), for instance).
1197 */
1198 ret = am7xxx_get_device_info(*dev, NULL);
1199 if (ret < 0)
1200 error(ctx, "cannot get device info\n");
1201
1202out:
1203 return ret;
1204}
1205
1206AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
1207{
1208 if (dev == NULL) {
1209 fatal("dev must not be NULL!\n");
1210 return -EINVAL;
1211 }
1212 if (dev->usb_device) {
1213 wait_for_trasfer_completed(dev);
1214 libusb_release_interface(dev->usb_device, dev->desc->interface_number);
1215 libusb_close(dev->usb_device);
1216 dev->usb_device = NULL;
1217 }
1218 return 0;
1219}
1220
1222 am7xxx_device_info *device_info)
1223{
1224 int ret;
1225 struct am7xxx_header h;
1226
1227 /* if there is a cached copy of the device info, just return that */
1228 if (dev->device_info)
1229 goto return_value;
1230
1231 ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
1232 if (ret < 0)
1233 return ret;
1234
1235 memset(&h, 0, sizeof(h));
1236 ret = read_header(dev, &h);
1237 if (ret < 0)
1238 return ret;
1239
1240 if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
1241 error(dev->ctx, "expected packet type: %d, got %d instead!\n",
1242 AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
1243 errno = EINVAL;
1244 return -EINVAL;
1245 }
1246
1247 dev->device_info = malloc(sizeof(*dev->device_info));
1248 if (dev->device_info == NULL) {
1249 error(dev->ctx, "cannot allocate a device info (%s)\n",
1250 strerror(errno));
1251 return -ENOMEM;
1252 }
1253 memset(dev->device_info, 0, sizeof(*dev->device_info));
1254
1255 dev->device_info->native_width = h.header_data.devinfo.native_width;
1256 dev->device_info->native_height = h.header_data.devinfo.native_height;
1257#if 0
1258 /* No reason to expose these in the public API until we know what they mean */
1259 dev->device_info->unknown0 = h.header_data.devinfo.unknown0;
1260 dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
1261#endif
1262
1263return_value:
1264 if (device_info)
1265 memcpy(device_info, dev->device_info, sizeof(*device_info));
1266 return 0;
1267}
1268
1270 unsigned int upscale,
1271 unsigned int original_width,
1272 unsigned int original_height,
1273 unsigned int *scaled_width,
1274 unsigned int *scaled_height)
1275{
1276 am7xxx_device_info device_info;
1277 float width_ratio;
1278 float height_ratio;
1279 int ret;
1280
1281 ret = am7xxx_get_device_info(dev, &device_info);
1282 if (ret < 0) {
1283 error(dev->ctx, "cannot get device info\n");
1284 return ret;
1285 }
1286
1287 /*
1288 * Check if we need to rescale; if the input image fits the native
1289 * dimensions there is no need to, unless we want to upscale.
1290 */
1291 if (!upscale &&
1292 original_width <= device_info.native_width &&
1293 original_height <= device_info.native_height ) {
1294 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
1295 *scaled_width = original_width;
1296 *scaled_height = original_height;
1297 return 0;
1298 }
1299
1300 /* Input dimensions relative to the device native dimensions */
1301 width_ratio = (float)original_width / device_info.native_width;
1302 height_ratio = (float)original_height / device_info.native_height;
1303
1304 if (width_ratio > height_ratio) {
1305 /*
1306 * The input is proportionally "wider" than the device viewport
1307 * so its height needs to be adjusted
1308 */
1309 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
1310 *scaled_width = device_info.native_width;
1311 *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
1312 } else if (width_ratio < height_ratio) {
1313 /*
1314 * The input is proportionally "taller" than the device viewport
1315 * so its width needs to be adjusted
1316 */
1317 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
1318 *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
1319 *scaled_height = device_info.native_height;
1320 } else {
1321 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
1322 *scaled_width = device_info.native_width;
1323 *scaled_height = device_info.native_height;
1324 }
1325 debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
1326
1327 return 0;
1328}
1329
1330AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
1331 am7xxx_image_format format,
1332 unsigned int width,
1333 unsigned int height,
1334 uint8_t *image,
1335 unsigned int image_size)
1336{
1337 int ret;
1338 struct am7xxx_header h = {
1339 .packet_type = AM7XXX_PACKET_TYPE_IMAGE,
1340 .direction = AM7XXX_DIRECTION_OUT,
1341 .header_data_len = sizeof(struct am7xxx_image_header),
1342 .unknown2 = 0x3e,
1343 .unknown3 = 0x10,
1344 .header_data = {
1345 .image = {
1346 .format = format,
1347 .width = width,
1348 .height = height,
1349 .image_size = image_size,
1350 },
1351 },
1352 };
1353
1354 ret = send_header(dev, &h);
1355 if (ret < 0)
1356 return ret;
1357
1358 if (image == NULL || image_size == 0) {
1359 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1360 return 0;
1361 }
1362
1363 return send_data(dev, image, image_size);
1364}
1365
1366AM7XXX_PUBLIC int am7xxx_send_image_async(am7xxx_device *dev,
1367 am7xxx_image_format format,
1368 unsigned int width,
1369 unsigned int height,
1370 uint8_t *image,
1371 unsigned int image_size)
1372{
1373 int ret;
1374 struct am7xxx_header h = {
1375 .packet_type = AM7XXX_PACKET_TYPE_IMAGE,
1376 .direction = AM7XXX_DIRECTION_OUT,
1377 .header_data_len = sizeof(struct am7xxx_image_header),
1378 .unknown2 = 0x3e,
1379 .unknown3 = 0x10,
1380 .header_data = {
1381 .image = {
1382 .format = format,
1383 .width = width,
1384 .height = height,
1385 .image_size = image_size,
1386 },
1387 },
1388 };
1389
1390 ret = send_header(dev, &h);
1391 if (ret < 0)
1392 return ret;
1393
1394 if (image == NULL || image_size == 0) {
1395 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1396 return 0;
1397 }
1398
1399 return send_data_async(dev, image, image_size);
1400}
1401
1403{
1404 if (dev->desc->ops.set_power_mode == NULL) {
1405 warning(dev->ctx,
1406 "setting power mode is unsupported on this device\n");
1407 return 0;
1408 }
1409
1410 return dev->desc->ops.set_power_mode(dev, power);
1411}
1412
1414{
1415 if (dev->desc->ops.set_zoom_mode == NULL) {
1416 warning(dev->ctx,
1417 "setting zoom mode is unsupported on this device\n");
1418 return 0;
1419 }
1420
1421 return dev->desc->ops.set_zoom_mode(dev, zoom);
1422}
Public libam7xxx API.
am7xxx_zoom_mode
The display zoom modes.
Definition: am7xxx.h:122
@ AM7XXX_ZOOM_H
Zoom 1: H Scale (changes aspect ratio).
Definition: am7xxx.h:124
@ AM7XXX_ZOOM_ORIGINAL
Original Size, as retrieved via am7xxx_device_info.
Definition: am7xxx.h:123
@ AM7XXX_ZOOM_TELE
Zoom Tele: available on some PicoPix models.
Definition: am7xxx.h:127
@ AM7XXX_ZOOM_TEST
Zoom test screen, the firmware version is shown as well.
Definition: am7xxx.h:126
@ AM7XXX_ZOOM_H_V
Zoom 2: H/V Scale (changes aspect ratio).
Definition: am7xxx.h:125
am7xxx_log_level
The verbosity level of logging messages.
Definition: am7xxx.h:68
@ AM7XXX_LOG_ERROR
Error messages, typically they describe API functions failures.
Definition: am7xxx.h:70
@ AM7XXX_LOG_FATAL
Fatal messages, the user application should stop if it gets one of this.
Definition: am7xxx.h:69
@ AM7XXX_LOG_TRACE
Verbose informations about the communication with the hardware.
Definition: am7xxx.h:74
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:1269
am7xxx_power_mode
The device power modes.
Definition: am7xxx.h:99
@ AM7XXX_POWER_HIGH
More brightness, but more power consumption.
Definition: am7xxx.h:103
@ AM7XXX_POWER_OFF
Display is powered off, no image shown.
Definition: am7xxx.h:100
@ AM7XXX_POWER_TURBO
Max brightness and power consumption.
Definition: am7xxx.h:104
@ AM7XXX_POWER_LOW
Low power consumption but also low brightness.
Definition: am7xxx.h:101
@ AM7XXX_POWER_MIDDLE
Middle level of brightness.
Definition: am7xxx.h:102
int am7xxx_get_device_info(am7xxx_device *dev, am7xxx_device_info *device_info)
Get info about an am7xxx device.
Definition: am7xxx.c:1221
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_image_format
The image formats accepted by the device.
Definition: am7xxx.h:80
void am7xxx_shutdown(am7xxx_context *ctx)
Cleanup the library data structures and free the context.
Definition: am7xxx.c:1140
void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
Set verbosity level of log messages.
Definition: am7xxx.c:1163
int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
Set the power mode of an am7xxx device.
Definition: am7xxx.c:1402
struct _am7xxx_device am7xxx_device
An opaque data type representing an am7xxx device.
Definition: am7xxx.h:46
int am7xxx_close_device(am7xxx_device *dev)
Close an am7xxx_device.
Definition: am7xxx.c:1206
int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
Set the zoom mode of an am7xxx device.
Definition: am7xxx.c:1413
struct _am7xxx_context am7xxx_context
An opaque data type representing a context.
Definition: am7xxx.h:38
int am7xxx_init(am7xxx_context **ctx)
Initialize the library context and data structures, and scan for devices.
Definition: am7xxx.c:1100
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.
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:1168
A struct describing device specific properties.
Definition: am7xxx.h:56
unsigned int native_height
The device native height.
Definition: am7xxx.h:58
unsigned int native_width
The device native width.
Definition: am7xxx.h:57