0daa259093490a162c776376eb6063af9a31526e
[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                 .name       = "Philips/Sagemcom PicoPix 2055",
96                 .vendor_id  = 0x21e7,
97                 .product_id = 0x0016,
98         },
99 };
100
101 /* The header size on the wire is known to be always 24 bytes, regardless of
102  * the memory configuration enforced by different architectures or compilers
103  * for struct am7xxx_header
104  */
105 #define AM7XXX_HEADER_WIRE_SIZE 24
106
107 struct _am7xxx_device {
108         libusb_device_handle *usb_device;
109         uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
110         am7xxx_context *ctx;
111         am7xxx_device *next;
112 };
113
114 struct _am7xxx_context {
115         libusb_context *usb_context;
116         int log_level;
117         am7xxx_device *devices_list;
118 };
119
120 typedef enum {
121         AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
122         AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
123         AM7XXX_PACKET_TYPE_POWER   = 0x04,
124         AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
125 } am7xxx_packet_type;
126
127 struct am7xxx_generic_header {
128         uint32_t field0;
129         uint32_t field1;
130         uint32_t field2;
131         uint32_t field3;
132 };
133
134 struct am7xxx_devinfo_header {
135         uint32_t native_width;
136         uint32_t native_height;
137         uint32_t unknown0;
138         uint32_t unknown1;
139 };
140
141 struct am7xxx_image_header {
142         uint32_t format;
143         uint32_t width;
144         uint32_t height;
145         uint32_t image_size;
146 };
147
148 struct am7xxx_power_header {
149         uint32_t bit2;
150         uint32_t bit1;
151         uint32_t bit0;
152 };
153
154 struct am7xxx_zoom_header {
155         uint32_t bit1;
156         uint32_t bit0;
157 };
158
159 /*
160  * Examples of packet headers:
161  *
162  * Image header:
163  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
164  *
165  * Power header:
166  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
167  */
168
169 /* Direction of the communication from the host point of view */
170 #define AM7XXX_DIRECTION_OUT 0 /* host -> device */
171 #define AM7XXX_DIRECTION_IN  1 /* host <- device */
172
173 struct am7xxx_header {
174         uint32_t packet_type;
175         uint8_t direction;
176         uint8_t header_data_len;
177         uint8_t unknown2;
178         uint8_t unknown3;
179         union {
180                 struct am7xxx_generic_header data;
181                 struct am7xxx_devinfo_header devinfo;
182                 struct am7xxx_image_header image;
183                 struct am7xxx_power_header power;
184                 struct am7xxx_zoom_header zoom;
185         } header_data;
186 };
187
188
189 #ifdef DEBUG
190 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
191 {
192         if (ctx == NULL || d == NULL)
193                 return;
194
195         debug(ctx, "Info header:\n");
196         debug(ctx, "\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
197         debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
198         debug(ctx, "\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
199         debug(ctx, "\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
200 }
201
202 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
203 {
204         if (ctx == NULL || i == NULL)
205                 return;
206
207         debug(ctx, "Image header:\n");
208         debug(ctx, "\tformat:     0x%08x (%u)\n", i->format, i->format);
209         debug(ctx, "\twidth:      0x%08x (%u)\n", i->width, i->width);
210         debug(ctx, "\theight:     0x%08x (%u)\n", i->height, i->height);
211         debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
212 }
213
214 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
215 {
216         if (ctx == NULL || p == NULL)
217                 return;
218
219         debug(ctx, "Power header:\n");
220         debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
221         debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
222         debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
223 }
224
225 static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
226 {
227         if (ctx == NULL || z == NULL)
228                 return;
229
230         debug(ctx, "Zoom header:\n");
231         debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
232         debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
233 }
234
235 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
236 {
237         if (ctx == NULL || h == NULL)
238                 return;
239
240         debug(ctx, "BEGIN\n");
241         debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
242         debug(ctx, "direction:       0x%02hhx (%hhu)\n", h->direction, h->direction);
243         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
244         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
245         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
246
247         switch(h->packet_type) {
248         case AM7XXX_PACKET_TYPE_DEVINFO:
249                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
250                 break;
251
252         case AM7XXX_PACKET_TYPE_IMAGE:
253                 debug_dump_image_header(ctx, &(h->header_data.image));
254                 break;
255
256         case AM7XXX_PACKET_TYPE_POWER:
257                 debug_dump_power_header(ctx, &(h->header_data.power));
258                 break;
259
260         case AM7XXX_PACKET_TYPE_ZOOM:
261                 debug_dump_zoom_header(ctx, &(h->header_data.zoom));
262                 break;
263
264         default:
265                 debug(ctx, "Packet type not supported!\n");
266                 break;
267         }
268         debug(ctx, "END\n\n");
269 }
270
271 static inline unsigned int in_80chars(unsigned int i)
272 {
273         /* The 3 below is the length of "xx " where xx is the hex string
274          * representation of a byte */
275         return ((i+1) % (80/3));
276 }
277
278 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
279                               uint8_t *buffer, unsigned int len)
280 {
281         unsigned int i;
282
283         if (ctx == NULL || buffer == NULL || len == 0)
284                 return;
285
286         trace(ctx, "\n");
287         if (message)
288                 trace(ctx, "%s\n", message);
289
290         for (i = 0; i < len; i++) {
291                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
292         }
293         trace(ctx, "\n");
294 }
295 #else
296 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
297 {
298         (void)ctx;
299         (void)h;
300 }
301
302 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
303                               uint8_t *buffer, unsigned int len)
304 {
305         (void)ctx;
306         (void)message;
307         (void)buffer;
308         (void)len;
309 }
310 #endif /* DEBUG */
311
312 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
313 {
314         int ret;
315         int transferred = 0;
316
317         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
318         if (ret != 0 || (unsigned int)transferred != len) {
319                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
320                       ret, transferred, len);
321                 return ret;
322         }
323
324         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
325
326         return 0;
327 }
328
329 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
330 {
331         int ret;
332         int transferred = 0;
333
334         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
335
336         ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
337         if (ret != 0 || (unsigned int)transferred != len) {
338                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
339                       ret, transferred, len);
340                 return ret;
341         }
342
343         return 0;
344 }
345
346 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
347 {
348         uint8_t **buffer_iterator = &buffer;
349
350         put_le32(h->packet_type, buffer_iterator);
351         put_8(h->direction, buffer_iterator);
352         put_8(h->header_data_len, buffer_iterator);
353         put_8(h->unknown2, buffer_iterator);
354         put_8(h->unknown3, buffer_iterator);
355         put_le32(h->header_data.data.field0, buffer_iterator);
356         put_le32(h->header_data.data.field1, buffer_iterator);
357         put_le32(h->header_data.data.field2, buffer_iterator);
358         put_le32(h->header_data.data.field3, buffer_iterator);
359 }
360
361 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
362 {
363         uint8_t **buffer_iterator = &buffer;
364
365         h->packet_type = get_le32(buffer_iterator);
366         h->direction = get_8(buffer_iterator);
367         h->header_data_len = get_8(buffer_iterator);
368         h->unknown2 = get_8(buffer_iterator);
369         h->unknown3 = get_8(buffer_iterator);
370         h->header_data.data.field0 = get_le32(buffer_iterator);
371         h->header_data.data.field1 = get_le32(buffer_iterator);
372         h->header_data.data.field2 = get_le32(buffer_iterator);
373         h->header_data.data.field3 = get_le32(buffer_iterator);
374 }
375
376 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
377 {
378         int ret;
379
380         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
381         if (ret < 0)
382                 goto out;
383
384         unserialize_header(dev->buffer, h);
385
386         debug_dump_header(dev->ctx, h);
387
388         if (h->direction == AM7XXX_DIRECTION_IN) {
389                 ret = 0;
390         } else {
391                 error(dev->ctx,
392                       "Received a packet with direction AM7XXX_DIRECTION_OUT, weird!\n");
393                 ret = -EINVAL;
394         }
395
396 out:
397         return ret;
398 }
399
400 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
401 {
402         int ret;
403
404         debug_dump_header(dev->ctx, h);
405
406         serialize_header(h, dev->buffer);
407         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
408         if (ret < 0)
409                 error(dev->ctx, "failed to send data\n");
410
411         return ret;
412 }
413
414 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
415  * and print the message unconditionally, this makes it possible to print
416  * fatal messages even early on initialization, before the context has been
417  * set up */
418 static void log_message(am7xxx_context *ctx,
419                         int level,
420                         const char *function,
421                         int line,
422                         const char *fmt,
423                         ...)
424 {
425         va_list ap;
426
427         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
428                 if (function) {
429                         fprintf(stderr, "%s", function);
430                         if (line)
431                                 fprintf(stderr, "[%d]", line);
432                         fprintf(stderr, ": ");
433                 }
434
435                 va_start(ap, fmt);
436                 vfprintf(stderr, fmt, ap);
437                 va_end(ap);
438         }
439
440         return;
441 }
442
443 static am7xxx_device *add_new_device(am7xxx_context *ctx)
444 {
445         am7xxx_device **devices_list;
446         am7xxx_device *new_device;
447
448         if (ctx == NULL) {
449                 fatal("context must not be NULL!\n");
450                 return NULL;
451         }
452
453         devices_list = &(ctx->devices_list);
454
455         new_device = malloc(sizeof(*new_device));
456         if (new_device == NULL) {
457                 fatal("cannot allocate a new device (%s)\n", strerror(errno));
458                 return NULL;
459         }
460         memset(new_device, 0, sizeof(*new_device));
461
462         new_device->ctx = ctx;
463
464         if (*devices_list == NULL) {
465                 *devices_list = new_device;
466         } else {
467                 am7xxx_device *prev = *devices_list;
468                 while (prev->next)
469                         prev = prev->next;
470                 prev->next = new_device;
471         }
472         return new_device;
473 }
474
475 static am7xxx_device *find_device(am7xxx_context *ctx,
476                                   unsigned int device_index)
477 {
478         unsigned int i = 0;
479         am7xxx_device *current;
480
481         if (ctx == NULL) {
482                 fatal("context must not be NULL!\n");
483                 return NULL;
484         }
485
486         current = ctx->devices_list;
487         while (current && i++ < device_index)
488                 current = current->next;
489
490         return current;
491 }
492
493 typedef enum {
494         SCAN_OP_BUILD_DEVLIST,
495         SCAN_OP_OPEN_DEVICE,
496 } scan_op;
497
498 /**
499  * This is where the central logic of multi-device support is.
500  *
501  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
502  * 'dev' are ignored; the function returns 0 on success and a negative value
503  * on error.
504  *
505  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
506  * device with index 'open_device_index' and returns the correspondent
507  * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
508  * 1 if the device was already open and a negative value on error.
509  *
510  * NOTES:
511  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
512  * the caller might want to call am7xxx_shutdown() in order to remove
513  * devices possibly added before the failure.
514  */
515 static int scan_devices(am7xxx_context *ctx, scan_op op,
516                         unsigned int open_device_index, am7xxx_device **dev)
517 {
518         int num_devices;
519         libusb_device** list;
520         unsigned int current_index;
521         int i;
522         int ret;
523
524         if (ctx == NULL) {
525                 fatal("context must not be NULL!\n");
526                 return -EINVAL;
527         }
528         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
529                 error(ctx, "device scan done already? Abort!\n");
530                 return -EINVAL;
531         }
532
533         num_devices = libusb_get_device_list(ctx->usb_context, &list);
534         if (num_devices < 0) {
535                 ret = -ENODEV;
536                 goto out;
537         }
538
539         current_index = 0;
540         for (i = 0; i < num_devices; i++) {
541                 struct libusb_device_descriptor desc;
542                 unsigned int j;
543
544                 ret = libusb_get_device_descriptor(list[i], &desc);
545                 if (ret < 0)
546                         continue;
547
548                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
549                         if (desc.idVendor == supported_devices[j].vendor_id
550                             && desc.idProduct == supported_devices[j].product_id) {
551
552                                 if (op == SCAN_OP_BUILD_DEVLIST) {
553                                         am7xxx_device *new_device;
554                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
555                                              current_index,
556                                              supported_devices[j].name);
557                                         new_device = add_new_device(ctx);
558                                         if (new_device == NULL) {
559                                                 /* XXX, the caller may want
560                                                  * to call am7xxx_shutdown() if
561                                                  * we fail here, as we may have
562                                                  * added some devices already
563                                                  */
564                                                 debug(ctx, "Cannot create a new device\n");
565                                                 ret = -ENODEV;
566                                                 goto out;
567                                         }
568                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
569                                            current_index == open_device_index) {
570
571                                         *dev = find_device(ctx, open_device_index);
572                                         if (*dev == NULL) {
573                                                 ret = -ENODEV;
574                                                 goto out;
575                                         }
576
577                                         /* the usb device has already been opened */
578                                         if ((*dev)->usb_device) {
579                                                 debug(ctx, "(*dev)->usb_device already set\n");
580                                                 ret = 1;
581                                                 goto out;
582                                         }
583
584                                         ret = libusb_open(list[i], &((*dev)->usb_device));
585                                         if (ret < 0) {
586                                                 debug(ctx, "libusb_open failed\n");
587                                                 goto out;
588                                         }
589
590                                         libusb_set_configuration((*dev)->usb_device, 2);
591                                         libusb_claim_interface((*dev)->usb_device, 0);
592                                         goto out;
593                                 }
594                                 current_index++;
595                         }
596                 }
597         }
598
599         /* if we made it up to here we didn't find any device to open */
600         if (op == SCAN_OP_OPEN_DEVICE) {
601                 error(ctx, "Cannot find any device to open\n");
602                 ret = -ENODEV;
603                 goto out;
604         }
605
606         /* everything went fine when building the device list */
607         ret = 0;
608 out:
609         libusb_free_device_list(list, 1);
610         return ret;
611 }
612
613 /* Public API */
614
615 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
616 {
617         int ret = 0;
618
619         *ctx = malloc(sizeof(**ctx));
620         if (*ctx == NULL) {
621                 fatal("cannot allocate the context (%s)\n", strerror(errno));
622                 ret = -ENOMEM;
623                 goto out;
624         }
625         memset(*ctx, 0, sizeof(**ctx));
626
627         /* Set the highest log level during initialization */
628         (*ctx)->log_level = AM7XXX_LOG_TRACE;
629
630         ret = libusb_init(&((*ctx)->usb_context));
631         if (ret < 0)
632                 goto out_free_context;
633
634         libusb_set_debug((*ctx)->usb_context, 3);
635
636         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
637         if (ret < 0) {
638                 error(*ctx, "scan_devices() failed\n");
639                 am7xxx_shutdown(*ctx);
640                 goto out;
641         }
642
643         /* Set a quieter log level as default for normal operation */
644         (*ctx)->log_level = AM7XXX_LOG_ERROR;
645         return 0;
646
647 out_free_context:
648         free(*ctx);
649         *ctx = NULL;
650 out:
651         return ret;
652 }
653
654 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
655 {
656         am7xxx_device *current;
657
658         if (ctx == NULL) {
659                 fatal("context must not be NULL!\n");
660                 return;
661         }
662
663         current = ctx->devices_list;
664         while (current) {
665                 am7xxx_device *next = current->next;
666                 am7xxx_close_device(current);
667                 free(current);
668                 current = next;
669         }
670
671         libusb_exit(ctx->usb_context);
672         free(ctx);
673         ctx = NULL;
674 }
675
676 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
677 {
678         ctx->log_level = log_level;
679 }
680
681 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
682                        unsigned int device_index)
683 {
684         int ret;
685
686         if (ctx == NULL) {
687                 fatal("context must not be NULL!\n");
688                 return -EINVAL;
689         }
690
691         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
692         if (ret < 0) {
693                 errno = ENODEV;
694         } else if (ret > 0) {
695                 warning(ctx, "device %d already open\n", device_index);
696                 errno = EBUSY;
697                 ret = -EBUSY;
698         }
699
700         return ret;
701 }
702
703 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
704 {
705         if (dev == NULL) {
706                 fatal("dev must not be NULL!\n");
707                 return -EINVAL;
708         }
709         if (dev->usb_device) {
710                 libusb_release_interface(dev->usb_device, 0);
711                 libusb_close(dev->usb_device);
712                 dev->usb_device = NULL;
713         }
714         return 0;
715 }
716
717 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
718                            am7xxx_device_info *device_info)
719 {
720         int ret;
721         struct am7xxx_header h = {
722                 .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
723                 .direction       = AM7XXX_DIRECTION_OUT,
724                 .header_data_len = 0x00,
725                 .unknown2        = 0x3e,
726                 .unknown3        = 0x10,
727                 .header_data = {
728                         .devinfo = {
729                                 .native_width  = 0,
730                                 .native_height = 0,
731                                 .unknown0      = 0,
732                                 .unknown1      = 0,
733                         },
734                 },
735         };
736
737         ret = send_header(dev, &h);
738         if (ret < 0)
739                 return ret;
740
741         ret = read_header(dev, &h);
742         if (ret < 0)
743                 return ret;
744
745         device_info->native_width = h.header_data.devinfo.native_width;
746         device_info->native_height = h.header_data.devinfo.native_height;
747 #if 0
748         /* No reason to expose these in the public API until we know what they mean */
749         device_info->unknown0 = h.header_data.devinfo.unknown0;
750         device_info->unknown1 = h.header_data.devinfo.unknown1;
751 #endif
752
753         return 0;
754 }
755
756 AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
757                                         unsigned int upscale,
758                                         unsigned int original_width,
759                                         unsigned int original_height,
760                                         unsigned int *scaled_width,
761                                         unsigned int *scaled_height)
762 {
763
764         am7xxx_device_info device_info;
765         float width_ratio;
766         float height_ratio;
767         int ret;
768
769         ret = am7xxx_get_device_info(dev, &device_info);
770         if (ret < 0) {
771                 error(dev->ctx, "cannot get device info\n");
772                 return ret;
773         }
774
775         /*
776          * Check if we need to rescale; if the input image fits the native
777          * dimensions there is no need to, unless we want to upscale.
778          */
779         if (!upscale &&
780             original_width <= device_info.native_width &&
781             original_height <= device_info.native_height ) {
782                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
783                 *scaled_width = original_width;
784                 *scaled_height = original_height;
785                 return 0;
786         }
787
788         /* Input dimensions relative to the device native dimensions */
789         width_ratio =  (float)original_width / device_info.native_width;
790         height_ratio = (float)original_height / device_info.native_height;
791
792         if (width_ratio > height_ratio) {
793                 /*
794                  * The input is proportionally "wider" than the device viewport
795                  * so its height needs to be adjusted
796                  */
797                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
798                 *scaled_width = device_info.native_width;
799                 *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
800         } else if (width_ratio < height_ratio) {
801                 /*
802                  * The input is proportionally "taller" than the device viewport
803                  * so its width needs to be adjusted
804                  */
805                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
806                 *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
807                 *scaled_height = device_info.native_height;
808         } else {
809                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
810                 *scaled_width = device_info.native_width;
811                 *scaled_height = device_info.native_height;
812         }
813         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
814
815         return 0;
816 }
817
818 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
819                       am7xxx_image_format format,
820                       unsigned int width,
821                       unsigned int height,
822                       uint8_t *image,
823                       unsigned int image_size)
824 {
825         int ret;
826         struct am7xxx_header h = {
827                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
828                 .direction       = AM7XXX_DIRECTION_OUT,
829                 .header_data_len = sizeof(struct am7xxx_image_header),
830                 .unknown2        = 0x3e,
831                 .unknown3        = 0x10,
832                 .header_data = {
833                         .image = {
834                                 .format     = format,
835                                 .width      = width,
836                                 .height     = height,
837                                 .image_size = image_size,
838                         },
839                 },
840         };
841
842         ret = send_header(dev, &h);
843         if (ret < 0)
844                 return ret;
845
846         if (image == NULL || image_size == 0) {
847                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
848                 return 0;
849         }
850
851         return send_data(dev, image, image_size);
852 }
853
854 AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
855 {
856         int ret;
857         struct am7xxx_header h = {
858                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
859                 .direction       = AM7XXX_DIRECTION_OUT,
860                 .header_data_len = sizeof(struct am7xxx_power_header),
861                 .unknown2        = 0x3e,
862                 .unknown3        = 0x10,
863         };
864
865         switch(power) {
866         case AM7XXX_POWER_OFF:
867                 h.header_data.power.bit2 = 0;
868                 h.header_data.power.bit1 = 0;
869                 h.header_data.power.bit0 = 0;
870                 break;
871
872         case AM7XXX_POWER_LOW:
873                 h.header_data.power.bit2 = 0;
874                 h.header_data.power.bit1 = 0;
875                 h.header_data.power.bit0 = 1;
876                 break;
877
878         case AM7XXX_POWER_MIDDLE:
879                 h.header_data.power.bit2 = 0;
880                 h.header_data.power.bit1 = 1;
881                 h.header_data.power.bit0 = 0;
882                 break;
883
884         case AM7XXX_POWER_HIGH:
885                 h.header_data.power.bit2 = 0;
886                 h.header_data.power.bit1 = 1;
887                 h.header_data.power.bit0 = 1;
888                 break;
889
890         case AM7XXX_POWER_TURBO:
891                 h.header_data.power.bit2 = 1;
892                 h.header_data.power.bit1 = 0;
893                 h.header_data.power.bit0 = 0;
894                 break;
895
896         default:
897                 error(dev->ctx, "Unsupported power mode.\n");
898                 return -EINVAL;
899         };
900
901         ret = send_header(dev, &h);
902         if (ret < 0)
903                 return ret;
904
905         return 0;
906 }
907
908 AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
909 {
910         int ret;
911         struct am7xxx_header h = {
912                 .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
913                 .direction       = AM7XXX_DIRECTION_OUT,
914                 .header_data_len = sizeof(struct am7xxx_zoom_header),
915                 .unknown2        = 0x3e,
916                 .unknown3        = 0x10,
917         };
918
919         switch(zoom) {
920         case AM7XXX_ZOOM_ORIGINAL:
921                 h.header_data.zoom.bit1 = 0;
922                 h.header_data.zoom.bit0 = 0;
923                 break;
924
925         case AM7XXX_ZOOM_H:
926                 h.header_data.zoom.bit1 = 0;
927                 h.header_data.zoom.bit0 = 1;
928                 break;
929
930         case AM7XXX_ZOOM_H_V:
931                 h.header_data.zoom.bit1 = 1;
932                 h.header_data.zoom.bit0 = 0;
933                 break;
934
935         case AM7XXX_ZOOM_TEST:
936                 h.header_data.zoom.bit1 = 1;
937                 h.header_data.zoom.bit0 = 1;
938                 break;
939
940         default:
941                 error(dev->ctx, "Unsupported zoom mode.\n");
942                 return -EINVAL;
943         };
944
945         ret = send_header(dev, &h);
946         if (ret < 0)
947                 return ret;
948
949         return 0;
950 }