548107573a04fbb62855eeb29a1d5cebbd312fcb
[libam7xxx.git] / src / am7xxx.c
1 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
2  *
3  * Copyright (C) 2012  Antonio Ospite <ospite@studenti.unina.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
30 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
31
32 /* If we're not using GNU C, elide __attribute__
33  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
34  */
35 #ifndef __GNUC__
36 #  define  __attribute__(x)  /*NOTHING*/
37 #endif
38
39 /* Control shared library symbols visibility */
40 #if defined _WIN32 || defined __CYGWIN__
41         #define AM7XXX_PUBLIC __declspec(dllexport)
42         #define AM7XXX_LOCAL
43 #else
44         #if __GNUC__ >= 4
45                 #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
46                 #define AM7XXX_LOCAL  __attribute__ ((visibility ("hidden")))
47         #else
48                 #define AM7XXX_PUBLIC
49                 #define AM7XXX_LOCAL
50         #endif
51 #endif
52
53 static void log_message(am7xxx_context *ctx,
54                         int level,
55                         const char *function,
56                         int line,
57                         const char *fmt,
58                         ...) __attribute__ ((format (printf, 5, 6)));
59
60 #define fatal(...)        log_message(NULL, AM7XXX_LOG_FATAL,   __func__, __LINE__, __VA_ARGS__)
61 #define error(ctx, ...)   log_message(ctx,  AM7XXX_LOG_ERROR,   __func__, __LINE__, __VA_ARGS__)
62 #define warning(ctx, ...) log_message(ctx,  AM7XXX_LOG_WARNING, __func__, 0,        __VA_ARGS__)
63 #define info(ctx, ...)    log_message(ctx,  AM7XXX_LOG_INFO,    __func__, 0,        __VA_ARGS__)
64 #define debug(ctx, ...)   log_message(ctx,  AM7XXX_LOG_DEBUG,   __func__, 0,        __VA_ARGS__)
65 #define trace(ctx, ...)   log_message(ctx,  AM7XXX_LOG_TRACE,   NULL,     0,        __VA_ARGS__)
66
67 struct am7xxx_usb_device_descriptor {
68         const char *name;
69         uint16_t vendor_id;
70         uint16_t product_id;
71 };
72
73 static struct am7xxx_usb_device_descriptor supported_devices[] = {
74         {
75                 .name       = "Acer C110",
76                 .vendor_id  = 0x1de1,
77                 .product_id = 0xc101,
78         },
79         {
80                 .name       = "Acer C112",
81                 .vendor_id  = 0x1de1,
82                 .product_id = 0x5501,
83         },
84         {
85                 .name       ="Aiptek PocketCinema T25",
86                 .vendor_id  = 0x08ca,
87                 .product_id = 0x2144,
88         },
89         {
90                 .name       = "Philips/Sagemcom PicoPix 1020",
91                 .vendor_id  = 0x21e7,
92                 .product_id = 0x000e,
93         },
94 };
95
96 /* The header size on the wire is known to be always 24 bytes, regardless of
97  * the memory configuration enforced by different architectures or compilers
98  * for struct am7xxx_header
99  */
100 #define AM7XXX_HEADER_WIRE_SIZE 24
101
102 struct _am7xxx_device {
103         libusb_device_handle *usb_device;
104         uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
105         am7xxx_context *ctx;
106         am7xxx_device *next;
107 };
108
109 struct _am7xxx_context {
110         libusb_context *usb_context;
111         int log_level;
112         am7xxx_device *devices_list;
113 };
114
115 typedef enum {
116         AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
117         AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
118         AM7XXX_PACKET_TYPE_POWER   = 0x04,
119         AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
120 } am7xxx_packet_type;
121
122 struct am7xxx_generic_header {
123         uint32_t field0;
124         uint32_t field1;
125         uint32_t field2;
126         uint32_t field3;
127 };
128
129 struct am7xxx_devinfo_header {
130         uint32_t native_width;
131         uint32_t native_height;
132         uint32_t unknown0;
133         uint32_t unknown1;
134 };
135
136 struct am7xxx_image_header {
137         uint32_t format;
138         uint32_t width;
139         uint32_t height;
140         uint32_t image_size;
141 };
142
143 struct am7xxx_power_header {
144         uint32_t bit2;
145         uint32_t bit1;
146         uint32_t bit0;
147 };
148
149 struct am7xxx_zoom_header {
150         uint32_t bit1;
151         uint32_t bit0;
152 };
153
154 /*
155  * Examples of packet headers:
156  *
157  * Image header:
158  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
159  *
160  * Power header:
161  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
162  */
163
164 /* Direction of the communication from the host point of view */
165 #define AM7XXX_DIRECTION_OUT 0 /* host -> device */
166 #define AM7XXX_DIRECTION_IN  1 /* host <- device */
167
168 struct am7xxx_header {
169         uint32_t packet_type;
170         uint8_t direction;
171         uint8_t header_data_len;
172         uint8_t unknown2;
173         uint8_t unknown3;
174         union {
175                 struct am7xxx_generic_header data;
176                 struct am7xxx_devinfo_header devinfo;
177                 struct am7xxx_image_header image;
178                 struct am7xxx_power_header power;
179                 struct am7xxx_zoom_header zoom;
180         } header_data;
181 };
182
183
184 #ifdef DEBUG
185 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
186 {
187         if (ctx == NULL || d == NULL)
188                 return;
189
190         debug(ctx, "Info header:\n");
191         debug(ctx, "\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
192         debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
193         debug(ctx, "\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
194         debug(ctx, "\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
195 }
196
197 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
198 {
199         if (ctx == NULL || i == NULL)
200                 return;
201
202         debug(ctx, "Image header:\n");
203         debug(ctx, "\tformat:     0x%08x (%u)\n", i->format, i->format);
204         debug(ctx, "\twidth:      0x%08x (%u)\n", i->width, i->width);
205         debug(ctx, "\theight:     0x%08x (%u)\n", i->height, i->height);
206         debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
207 }
208
209 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
210 {
211         if (ctx == NULL || p == NULL)
212                 return;
213
214         debug(ctx, "Power header:\n");
215         debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
216         debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
217         debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
218 }
219
220 static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
221 {
222         if (ctx == NULL || z == NULL)
223                 return;
224
225         debug(ctx, "Zoom header:\n");
226         debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
227         debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
228 }
229
230 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
231 {
232         if (ctx == NULL || h == NULL)
233                 return;
234
235         debug(ctx, "BEGIN\n");
236         debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
237         debug(ctx, "direction:       0x%02hhx (%hhu)\n", h->direction, h->direction);
238         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
239         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
240         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
241
242         switch(h->packet_type) {
243         case AM7XXX_PACKET_TYPE_DEVINFO:
244                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
245                 break;
246
247         case AM7XXX_PACKET_TYPE_IMAGE:
248                 debug_dump_image_header(ctx, &(h->header_data.image));
249                 break;
250
251         case AM7XXX_PACKET_TYPE_POWER:
252                 debug_dump_power_header(ctx, &(h->header_data.power));
253                 break;
254
255         case AM7XXX_PACKET_TYPE_ZOOM:
256                 debug_dump_zoom_header(ctx, &(h->header_data.zoom));
257                 break;
258
259         default:
260                 debug(ctx, "Packet type not supported!\n");
261                 break;
262         }
263         debug(ctx, "END\n\n");
264 }
265
266 static inline unsigned int in_80chars(unsigned int i)
267 {
268         /* The 3 below is the length of "xx " where xx is the hex string
269          * representation of a byte */
270         return ((i+1) % (80/3));
271 }
272
273 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
274                               uint8_t *buffer, unsigned int len)
275 {
276         unsigned int i;
277
278         if (ctx == NULL || buffer == NULL || len == 0)
279                 return;
280
281         trace(ctx, "\n");
282         if (message)
283                 trace(ctx, "%s\n", message);
284
285         for (i = 0; i < len; i++) {
286                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
287         }
288         trace(ctx, "\n");
289 }
290 #else
291 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
292 {
293         (void)ctx;
294         (void)h;
295 }
296
297 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
298                               uint8_t *buffer, unsigned int len)
299 {
300         (void)ctx;
301         (void)message;
302         (void)buffer;
303         (void)len;
304 }
305 #endif /* DEBUG */
306
307 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
308 {
309         int ret;
310         int transferred = 0;
311
312         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
313         if (ret != 0 || (unsigned int)transferred != len) {
314                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
315                       ret, transferred, len);
316                 return ret;
317         }
318
319         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
320
321         return 0;
322 }
323
324 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
325 {
326         int ret;
327         int transferred = 0;
328
329         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
330
331         ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
332         if (ret != 0 || (unsigned int)transferred != len) {
333                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
334                       ret, transferred, len);
335                 return ret;
336         }
337
338         return 0;
339 }
340
341 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
342 {
343         uint8_t **buffer_iterator = &buffer;
344
345         put_le32(h->packet_type, buffer_iterator);
346         put_8(h->direction, buffer_iterator);
347         put_8(h->header_data_len, buffer_iterator);
348         put_8(h->unknown2, buffer_iterator);
349         put_8(h->unknown3, buffer_iterator);
350         put_le32(h->header_data.data.field0, buffer_iterator);
351         put_le32(h->header_data.data.field1, buffer_iterator);
352         put_le32(h->header_data.data.field2, buffer_iterator);
353         put_le32(h->header_data.data.field3, buffer_iterator);
354 }
355
356 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
357 {
358         uint8_t **buffer_iterator = &buffer;
359
360         h->packet_type = get_le32(buffer_iterator);
361         h->direction = get_8(buffer_iterator);
362         h->header_data_len = get_8(buffer_iterator);
363         h->unknown2 = get_8(buffer_iterator);
364         h->unknown3 = get_8(buffer_iterator);
365         h->header_data.data.field0 = get_le32(buffer_iterator);
366         h->header_data.data.field1 = get_le32(buffer_iterator);
367         h->header_data.data.field2 = get_le32(buffer_iterator);
368         h->header_data.data.field3 = get_le32(buffer_iterator);
369 }
370
371 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
372 {
373         int ret;
374
375         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
376         if (ret < 0)
377                 goto out;
378
379         unserialize_header(dev->buffer, h);
380
381         debug_dump_header(dev->ctx, h);
382
383         if (h->direction == AM7XXX_DIRECTION_IN) {
384                 ret = 0;
385         } else {
386                 error(dev->ctx,
387                       "Received a packet with direction AM7XXX_DIRECTION_OUT, weird!\n");
388                 ret = -EINVAL;
389         }
390
391 out:
392         return ret;
393 }
394
395 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
396 {
397         int ret;
398
399         debug_dump_header(dev->ctx, h);
400
401         serialize_header(h, dev->buffer);
402         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
403         if (ret < 0)
404                 error(dev->ctx, "failed to send data\n");
405
406         return ret;
407 }
408
409 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
410  * and print the message unconditionally, this makes it possible to print
411  * fatal messages even early on initialization, before the context has been
412  * set up */
413 static void log_message(am7xxx_context *ctx,
414                         int level,
415                         const char *function,
416                         int line,
417                         const char *fmt,
418                         ...)
419 {
420         va_list ap;
421
422         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
423                 if (function) {
424                         fprintf(stderr, "%s", function);
425                         if (line)
426                                 fprintf(stderr, "[%d]", line);
427                         fprintf(stderr, ": ");
428                 }
429
430                 va_start(ap, fmt);
431                 vfprintf(stderr, fmt, ap);
432                 va_end(ap);
433         }
434
435         return;
436 }
437
438 static am7xxx_device *add_new_device(am7xxx_context *ctx)
439 {
440         am7xxx_device **devices_list;
441         am7xxx_device *new_device;
442
443         if (ctx == NULL) {
444                 fatal("context must not be NULL!\n");
445                 return NULL;
446         }
447
448         devices_list = &(ctx->devices_list);
449
450         new_device = malloc(sizeof(*new_device));
451         if (new_device == NULL) {
452                 fatal("cannot allocate a new device (%s)\n", strerror(errno));
453                 return NULL;
454         }
455         memset(new_device, 0, sizeof(*new_device));
456
457         new_device->ctx = ctx;
458
459         if (*devices_list == NULL) {
460                 *devices_list = new_device;
461         } else {
462                 am7xxx_device *prev = *devices_list;
463                 while (prev->next)
464                         prev = prev->next;
465                 prev->next = new_device;
466         }
467         return new_device;
468 }
469
470 static am7xxx_device *find_device(am7xxx_context *ctx,
471                                   unsigned int device_index)
472 {
473         unsigned int i = 0;
474         am7xxx_device *current;
475
476         if (ctx == NULL) {
477                 fatal("context must not be NULL!\n");
478                 return NULL;
479         }
480
481         current = ctx->devices_list;
482         while (current && i++ < device_index)
483                 current = current->next;
484
485         return current;
486 }
487
488 typedef enum {
489         SCAN_OP_BUILD_DEVLIST,
490         SCAN_OP_OPEN_DEVICE,
491 } scan_op;
492
493 /**
494  * This is where the central logic of multi-device support is.
495  *
496  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
497  * 'dev' are ignored; the function returns 0 on success and a negative value
498  * on error.
499  *
500  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
501  * device with index 'open_device_index' and returns the correspondent
502  * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
503  * 1 if the device was already open and a negative value on error.
504  *
505  * NOTES:
506  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
507  * the caller might want to call am7xxx_shutdown() in order to remove
508  * devices possibly added before the failure.
509  */
510 static int scan_devices(am7xxx_context *ctx, scan_op op,
511                         unsigned int open_device_index, am7xxx_device **dev)
512 {
513         int num_devices;
514         libusb_device** list;
515         unsigned int current_index;
516         int i;
517         int ret;
518
519         if (ctx == NULL) {
520                 fatal("context must not be NULL!\n");
521                 return -EINVAL;
522         }
523         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
524                 error(ctx, "device scan done already? Abort!\n");
525                 return -EINVAL;
526         }
527
528         num_devices = libusb_get_device_list(ctx->usb_context, &list);
529         if (num_devices < 0) {
530                 ret = -ENODEV;
531                 goto out;
532         }
533
534         current_index = 0;
535         for (i = 0; i < num_devices; i++) {
536                 struct libusb_device_descriptor desc;
537                 unsigned int j;
538
539                 ret = libusb_get_device_descriptor(list[i], &desc);
540                 if (ret < 0)
541                         continue;
542
543                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
544                         if (desc.idVendor == supported_devices[j].vendor_id
545                             && desc.idProduct == supported_devices[j].product_id) {
546
547                                 if (op == SCAN_OP_BUILD_DEVLIST) {
548                                         am7xxx_device *new_device;
549                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
550                                              current_index,
551                                              supported_devices[j].name);
552                                         new_device = add_new_device(ctx);
553                                         if (new_device == NULL) {
554                                                 /* XXX, the caller may want
555                                                  * to call am7xxx_shutdown() if
556                                                  * we fail here, as we may have
557                                                  * added some devices already
558                                                  */
559                                                 debug(ctx, "Cannot create a new device\n");
560                                                 ret = -ENODEV;
561                                                 goto out;
562                                         }
563                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
564                                            current_index == open_device_index) {
565
566                                         *dev = find_device(ctx, open_device_index);
567                                         if (*dev == NULL) {
568                                                 ret = -ENODEV;
569                                                 goto out;
570                                         }
571
572                                         /* the usb device has already been opened */
573                                         if ((*dev)->usb_device) {
574                                                 debug(ctx, "(*dev)->usb_device already set\n");
575                                                 ret = 1;
576                                                 goto out;
577                                         }
578
579                                         ret = libusb_open(list[i], &((*dev)->usb_device));
580                                         if (ret < 0) {
581                                                 debug(ctx, "libusb_open failed\n");
582                                                 goto out;
583                                         }
584
585                                         libusb_set_configuration((*dev)->usb_device, 2);
586                                         libusb_claim_interface((*dev)->usb_device, 0);
587                                         goto out;
588                                 }
589                                 current_index++;
590                         }
591                 }
592         }
593
594         /* if we made it up to here we didn't find any device to open */
595         if (op == SCAN_OP_OPEN_DEVICE) {
596                 error(ctx, "Cannot find any device to open\n");
597                 ret = -ENODEV;
598                 goto out;
599         }
600
601         /* everything went fine when building the device list */
602         ret = 0;
603 out:
604         libusb_free_device_list(list, 1);
605         return ret;
606 }
607
608 /* Public API */
609
610 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
611 {
612         int ret = 0;
613
614         *ctx = malloc(sizeof(**ctx));
615         if (*ctx == NULL) {
616                 fatal("cannot allocate the context (%s)\n", strerror(errno));
617                 ret = -ENOMEM;
618                 goto out;
619         }
620         memset(*ctx, 0, sizeof(**ctx));
621
622         /* Set the highest log level during initialization */
623         (*ctx)->log_level = AM7XXX_LOG_TRACE;
624
625         ret = libusb_init(&((*ctx)->usb_context));
626         if (ret < 0)
627                 goto out_free_context;
628
629         libusb_set_debug((*ctx)->usb_context, 3);
630
631         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
632         if (ret < 0) {
633                 error(*ctx, "scan_devices() failed\n");
634                 am7xxx_shutdown(*ctx);
635                 goto out;
636         }
637
638         /* Set a quieter log level as default for normal operation */
639         (*ctx)->log_level = AM7XXX_LOG_ERROR;
640         return 0;
641
642 out_free_context:
643         free(*ctx);
644         *ctx = NULL;
645 out:
646         return ret;
647 }
648
649 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
650 {
651         am7xxx_device *current;
652
653         if (ctx == NULL) {
654                 fatal("context must not be NULL!\n");
655                 return;
656         }
657
658         current = ctx->devices_list;
659         while (current) {
660                 am7xxx_device *next = current->next;
661                 am7xxx_close_device(current);
662                 free(current);
663                 current = next;
664         }
665
666         libusb_exit(ctx->usb_context);
667         free(ctx);
668         ctx = NULL;
669 }
670
671 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
672 {
673         ctx->log_level = log_level;
674 }
675
676 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
677                        unsigned int device_index)
678 {
679         int ret;
680
681         if (ctx == NULL) {
682                 fatal("context must not be NULL!\n");
683                 return -EINVAL;
684         }
685
686         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
687         if (ret < 0) {
688                 errno = ENODEV;
689         } else if (ret > 0) {
690                 warning(ctx, "device %d already open\n", device_index);
691                 errno = EBUSY;
692                 ret = -EBUSY;
693         }
694
695         return ret;
696 }
697
698 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
699 {
700         if (dev == NULL) {
701                 fatal("dev must not be NULL!\n");
702                 return -EINVAL;
703         }
704         if (dev->usb_device) {
705                 libusb_release_interface(dev->usb_device, 0);
706                 libusb_close(dev->usb_device);
707                 dev->usb_device = NULL;
708         }
709         return 0;
710 }
711
712 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
713                            am7xxx_device_info *device_info)
714 {
715         int ret;
716         struct am7xxx_header h = {
717                 .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
718                 .direction       = AM7XXX_DIRECTION_OUT,
719                 .header_data_len = 0x00,
720                 .unknown2        = 0x3e,
721                 .unknown3        = 0x10,
722                 .header_data = {
723                         .devinfo = {
724                                 .native_width  = 0,
725                                 .native_height = 0,
726                                 .unknown0      = 0,
727                                 .unknown1      = 0,
728                         },
729                 },
730         };
731
732         ret = send_header(dev, &h);
733         if (ret < 0)
734                 return ret;
735
736         ret = read_header(dev, &h);
737         if (ret < 0)
738                 return ret;
739
740         device_info->native_width = h.header_data.devinfo.native_width;
741         device_info->native_height = h.header_data.devinfo.native_height;
742 #if 0
743         /* No reason to expose these in the public API until we know what they mean */
744         device_info->unknown0 = h.header_data.devinfo.unknown0;
745         device_info->unknown1 = h.header_data.devinfo.unknown1;
746 #endif
747
748         return 0;
749 }
750
751 AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
752                                         unsigned int upscale,
753                                         unsigned int original_width,
754                                         unsigned int original_height,
755                                         unsigned int *scaled_width,
756                                         unsigned int *scaled_height)
757 {
758
759         am7xxx_device_info device_info;
760         float width_ratio;
761         float height_ratio;
762         int ret;
763
764         ret = am7xxx_get_device_info(dev, &device_info);
765         if (ret < 0) {
766                 error(dev->ctx, "cannot get device info\n");
767                 return ret;
768         }
769
770         /*
771          * Check if we need to rescale; if the input image fits the native
772          * dimensions there is no need to, unless we want to upscale.
773          */
774         if (!upscale &&
775             original_width <= device_info.native_width &&
776             original_height <= device_info.native_height ) {
777                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
778                 *scaled_width = original_width;
779                 *scaled_height = original_height;
780                 return 0;
781         }
782
783         /* Input dimensions relative to the device native dimensions */
784         width_ratio =  (float)original_width / device_info.native_width;
785         height_ratio = (float)original_height / device_info.native_height;
786
787         if (width_ratio > height_ratio) {
788                 /*
789                  * The input is proportionally "wider" than the device viewport
790                  * so its height needs to be adjusted
791                  */
792                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
793                 *scaled_width = device_info.native_width;
794                 *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
795         } else if (width_ratio < height_ratio) {
796                 /*
797                  * The input is proportionally "taller" than the device viewport
798                  * so its width needs to be adjusted
799                  */
800                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
801                 *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
802                 *scaled_height = device_info.native_height;
803         } else {
804                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
805                 *scaled_width = device_info.native_width;
806                 *scaled_height = device_info.native_height;
807         }
808         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
809
810         return 0;
811 }
812
813 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
814                       am7xxx_image_format format,
815                       unsigned int width,
816                       unsigned int height,
817                       uint8_t *image,
818                       unsigned int image_size)
819 {
820         int ret;
821         struct am7xxx_header h = {
822                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
823                 .direction       = AM7XXX_DIRECTION_OUT,
824                 .header_data_len = sizeof(struct am7xxx_image_header),
825                 .unknown2        = 0x3e,
826                 .unknown3        = 0x10,
827                 .header_data = {
828                         .image = {
829                                 .format     = format,
830                                 .width      = width,
831                                 .height     = height,
832                                 .image_size = image_size,
833                         },
834                 },
835         };
836
837         ret = send_header(dev, &h);
838         if (ret < 0)
839                 return ret;
840
841         if (image == NULL || image_size == 0) {
842                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
843                 return 0;
844         }
845
846         return send_data(dev, image, image_size);
847 }
848
849 AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
850 {
851         int ret;
852         struct am7xxx_header h = {
853                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
854                 .direction       = AM7XXX_DIRECTION_OUT,
855                 .header_data_len = sizeof(struct am7xxx_power_header),
856                 .unknown2        = 0x3e,
857                 .unknown3        = 0x10,
858         };
859
860         switch(mode) {
861         case AM7XXX_POWER_OFF:
862                 h.header_data.power.bit2 = 0;
863                 h.header_data.power.bit1 = 0;
864                 h.header_data.power.bit0 = 0;
865                 break;
866
867         case AM7XXX_POWER_LOW:
868                 h.header_data.power.bit2 = 0;
869                 h.header_data.power.bit1 = 0;
870                 h.header_data.power.bit0 = 1;
871                 break;
872
873         case AM7XXX_POWER_MIDDLE:
874                 h.header_data.power.bit2 = 0;
875                 h.header_data.power.bit1 = 1;
876                 h.header_data.power.bit0 = 0;
877                 break;
878
879         case AM7XXX_POWER_HIGH:
880                 h.header_data.power.bit2 = 0;
881                 h.header_data.power.bit1 = 1;
882                 h.header_data.power.bit0 = 1;
883                 break;
884
885         case AM7XXX_POWER_TURBO:
886                 h.header_data.power.bit2 = 1;
887                 h.header_data.power.bit1 = 0;
888                 h.header_data.power.bit0 = 0;
889                 break;
890
891         default:
892                 error(dev->ctx, "Power mode not supported!\n");
893                 return -EINVAL;
894         };
895
896         ret = send_header(dev, &h);
897         if (ret < 0)
898                 return ret;
899
900         return 0;
901 }
902
903 AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
904 {
905         int ret;
906         struct am7xxx_header h = {
907                 .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
908                 .direction       = AM7XXX_DIRECTION_OUT,
909                 .header_data_len = sizeof(struct am7xxx_zoom_header),
910                 .unknown2        = 0x3e,
911                 .unknown3        = 0x10,
912         };
913
914         switch(zoom) {
915         case AM7XXX_ZOOM_ORIGINAL:
916                 h.header_data.zoom.bit1 = 0;
917                 h.header_data.zoom.bit0 = 0;
918                 break;
919
920         case AM7XXX_ZOOM_H:
921                 h.header_data.zoom.bit1 = 0;
922                 h.header_data.zoom.bit0 = 1;
923                 break;
924
925         case AM7XXX_ZOOM_H_V:
926                 h.header_data.zoom.bit1 = 1;
927                 h.header_data.zoom.bit0 = 0;
928                 break;
929
930         case AM7XXX_ZOOM_TEST:
931                 h.header_data.zoom.bit1 = 1;
932                 h.header_data.zoom.bit0 = 1;
933                 break;
934
935         default:
936                 error(dev->ctx, "Unsupported zoom mode.\n");
937                 return -EINVAL;
938         };
939
940         ret = send_header(dev, &h);
941         if (ret < 0)
942                 return ret;
943
944         return 0;
945 }