08858cdb89ad739ef697d3bc5eb756c6e7ea08cc
[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) (%s)\n", h->direction, h->direction,
243               h->direction == AM7XXX_DIRECTION_IN ? "IN" :
244               h->direction == AM7XXX_DIRECTION_OUT ? "OUT" :
245               "UNKNOWN");
246         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
247         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
248         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
249
250         switch(h->packet_type) {
251         case AM7XXX_PACKET_TYPE_DEVINFO:
252                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
253                 break;
254
255         case AM7XXX_PACKET_TYPE_IMAGE:
256                 debug_dump_image_header(ctx, &(h->header_data.image));
257                 break;
258
259         case AM7XXX_PACKET_TYPE_POWER:
260                 debug_dump_power_header(ctx, &(h->header_data.power));
261                 break;
262
263         case AM7XXX_PACKET_TYPE_ZOOM:
264                 debug_dump_zoom_header(ctx, &(h->header_data.zoom));
265                 break;
266
267         default:
268                 debug(ctx, "Packet type not supported!\n");
269                 break;
270         }
271         debug(ctx, "END\n\n");
272 }
273
274 static inline unsigned int in_80chars(unsigned int i)
275 {
276         /* The 3 below is the length of "xx " where xx is the hex string
277          * representation of a byte */
278         return ((i+1) % (80/3));
279 }
280
281 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
282                               uint8_t *buffer, unsigned int len)
283 {
284         unsigned int i;
285
286         if (ctx == NULL || buffer == NULL || len == 0)
287                 return;
288
289         trace(ctx, "\n");
290         if (message)
291                 trace(ctx, "%s\n", message);
292
293         for (i = 0; i < len; i++) {
294                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
295         }
296         trace(ctx, "\n");
297 }
298 #else
299 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
300 {
301         (void)ctx;
302         (void)h;
303 }
304
305 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
306                               uint8_t *buffer, unsigned int len)
307 {
308         (void)ctx;
309         (void)message;
310         (void)buffer;
311         (void)len;
312 }
313 #endif /* DEBUG */
314
315 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
316 {
317         int ret;
318         int transferred = 0;
319
320         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
321         if (ret != 0 || (unsigned int)transferred != len) {
322                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
323                       ret, transferred, len);
324                 return ret;
325         }
326
327         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
328
329         return 0;
330 }
331
332 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
333 {
334         int ret;
335         int transferred = 0;
336
337         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
338
339         ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
340         if (ret != 0 || (unsigned int)transferred != len) {
341                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
342                       ret, transferred, len);
343                 return ret;
344         }
345
346         return 0;
347 }
348
349 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
350 {
351         uint8_t **buffer_iterator = &buffer;
352
353         put_le32(h->packet_type, buffer_iterator);
354         put_8(h->direction, buffer_iterator);
355         put_8(h->header_data_len, buffer_iterator);
356         put_8(h->unknown2, buffer_iterator);
357         put_8(h->unknown3, buffer_iterator);
358         put_le32(h->header_data.data.field0, buffer_iterator);
359         put_le32(h->header_data.data.field1, buffer_iterator);
360         put_le32(h->header_data.data.field2, buffer_iterator);
361         put_le32(h->header_data.data.field3, buffer_iterator);
362 }
363
364 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
365 {
366         uint8_t **buffer_iterator = &buffer;
367
368         h->packet_type = get_le32(buffer_iterator);
369         h->direction = get_8(buffer_iterator);
370         h->header_data_len = get_8(buffer_iterator);
371         h->unknown2 = get_8(buffer_iterator);
372         h->unknown3 = get_8(buffer_iterator);
373         h->header_data.data.field0 = get_le32(buffer_iterator);
374         h->header_data.data.field1 = get_le32(buffer_iterator);
375         h->header_data.data.field2 = get_le32(buffer_iterator);
376         h->header_data.data.field3 = get_le32(buffer_iterator);
377 }
378
379 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
380 {
381         int ret;
382
383         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
384         if (ret < 0)
385                 goto out;
386
387         unserialize_header(dev->buffer, h);
388
389         debug_dump_header(dev->ctx, h);
390
391         if (h->direction == AM7XXX_DIRECTION_IN) {
392                 ret = 0;
393         } else {
394                 error(dev->ctx,
395                       "Received a packet with direction AM7XXX_DIRECTION_OUT, weird!\n");
396                 ret = -EINVAL;
397         }
398
399 out:
400         return ret;
401 }
402
403 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
404 {
405         int ret;
406
407         debug_dump_header(dev->ctx, h);
408
409         serialize_header(h, dev->buffer);
410         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
411         if (ret < 0)
412                 error(dev->ctx, "failed to send data\n");
413
414         return ret;
415 }
416
417 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
418  * and print the message unconditionally, this makes it possible to print
419  * fatal messages even early on initialization, before the context has been
420  * set up */
421 static void log_message(am7xxx_context *ctx,
422                         int level,
423                         const char *function,
424                         int line,
425                         const char *fmt,
426                         ...)
427 {
428         va_list ap;
429
430         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
431                 if (function) {
432                         fprintf(stderr, "%s", function);
433                         if (line)
434                                 fprintf(stderr, "[%d]", line);
435                         fprintf(stderr, ": ");
436                 }
437
438                 va_start(ap, fmt);
439                 vfprintf(stderr, fmt, ap);
440                 va_end(ap);
441         }
442
443         return;
444 }
445
446 static am7xxx_device *add_new_device(am7xxx_context *ctx)
447 {
448         am7xxx_device **devices_list;
449         am7xxx_device *new_device;
450
451         if (ctx == NULL) {
452                 fatal("context must not be NULL!\n");
453                 return NULL;
454         }
455
456         devices_list = &(ctx->devices_list);
457
458         new_device = malloc(sizeof(*new_device));
459         if (new_device == NULL) {
460                 fatal("cannot allocate a new device (%s)\n", strerror(errno));
461                 return NULL;
462         }
463         memset(new_device, 0, sizeof(*new_device));
464
465         new_device->ctx = ctx;
466
467         if (*devices_list == NULL) {
468                 *devices_list = new_device;
469         } else {
470                 am7xxx_device *prev = *devices_list;
471                 while (prev->next)
472                         prev = prev->next;
473                 prev->next = new_device;
474         }
475         return new_device;
476 }
477
478 static am7xxx_device *find_device(am7xxx_context *ctx,
479                                   unsigned int device_index)
480 {
481         unsigned int i = 0;
482         am7xxx_device *current;
483
484         if (ctx == NULL) {
485                 fatal("context must not be NULL!\n");
486                 return NULL;
487         }
488
489         current = ctx->devices_list;
490         while (current && i++ < device_index)
491                 current = current->next;
492
493         return current;
494 }
495
496 typedef enum {
497         SCAN_OP_BUILD_DEVLIST,
498         SCAN_OP_OPEN_DEVICE,
499 } scan_op;
500
501 /**
502  * This is where the central logic of multi-device support is.
503  *
504  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
505  * 'dev' are ignored; the function returns 0 on success and a negative value
506  * on error.
507  *
508  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
509  * device with index 'open_device_index' and returns the correspondent
510  * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
511  * 1 if the device was already open and a negative value on error.
512  *
513  * NOTES:
514  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
515  * the caller might want to call am7xxx_shutdown() in order to remove
516  * devices possibly added before the failure.
517  */
518 static int scan_devices(am7xxx_context *ctx, scan_op op,
519                         unsigned int open_device_index, am7xxx_device **dev)
520 {
521         int num_devices;
522         libusb_device** list;
523         unsigned int current_index;
524         int i;
525         int ret;
526
527         if (ctx == NULL) {
528                 fatal("context must not be NULL!\n");
529                 return -EINVAL;
530         }
531         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
532                 error(ctx, "device scan done already? Abort!\n");
533                 return -EINVAL;
534         }
535
536         num_devices = libusb_get_device_list(ctx->usb_context, &list);
537         if (num_devices < 0) {
538                 ret = -ENODEV;
539                 goto out;
540         }
541
542         current_index = 0;
543         for (i = 0; i < num_devices; i++) {
544                 struct libusb_device_descriptor desc;
545                 unsigned int j;
546
547                 ret = libusb_get_device_descriptor(list[i], &desc);
548                 if (ret < 0)
549                         continue;
550
551                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
552                         if (desc.idVendor == supported_devices[j].vendor_id
553                             && desc.idProduct == supported_devices[j].product_id) {
554
555                                 if (op == SCAN_OP_BUILD_DEVLIST) {
556                                         am7xxx_device *new_device;
557                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
558                                              current_index,
559                                              supported_devices[j].name);
560                                         new_device = add_new_device(ctx);
561                                         if (new_device == NULL) {
562                                                 /* XXX, the caller may want
563                                                  * to call am7xxx_shutdown() if
564                                                  * we fail here, as we may have
565                                                  * added some devices already
566                                                  */
567                                                 debug(ctx, "Cannot create a new device\n");
568                                                 ret = -ENODEV;
569                                                 goto out;
570                                         }
571                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
572                                            current_index == open_device_index) {
573
574                                         *dev = find_device(ctx, open_device_index);
575                                         if (*dev == NULL) {
576                                                 ret = -ENODEV;
577                                                 goto out;
578                                         }
579
580                                         /* the usb device has already been opened */
581                                         if ((*dev)->usb_device) {
582                                                 debug(ctx, "(*dev)->usb_device already set\n");
583                                                 ret = 1;
584                                                 goto out;
585                                         }
586
587                                         ret = libusb_open(list[i], &((*dev)->usb_device));
588                                         if (ret < 0) {
589                                                 debug(ctx, "libusb_open failed\n");
590                                                 goto out;
591                                         }
592
593                                         libusb_set_configuration((*dev)->usb_device, 2);
594                                         libusb_claim_interface((*dev)->usb_device, 0);
595                                         goto out;
596                                 }
597                                 current_index++;
598                         }
599                 }
600         }
601
602         /* if we made it up to here we didn't find any device to open */
603         if (op == SCAN_OP_OPEN_DEVICE) {
604                 error(ctx, "Cannot find any device to open\n");
605                 ret = -ENODEV;
606                 goto out;
607         }
608
609         /* everything went fine when building the device list */
610         ret = 0;
611 out:
612         libusb_free_device_list(list, 1);
613         return ret;
614 }
615
616 /* Public API */
617
618 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
619 {
620         int ret = 0;
621
622         *ctx = malloc(sizeof(**ctx));
623         if (*ctx == NULL) {
624                 fatal("cannot allocate the context (%s)\n", strerror(errno));
625                 ret = -ENOMEM;
626                 goto out;
627         }
628         memset(*ctx, 0, sizeof(**ctx));
629
630         /* Set the highest log level during initialization */
631         (*ctx)->log_level = AM7XXX_LOG_TRACE;
632
633         ret = libusb_init(&((*ctx)->usb_context));
634         if (ret < 0)
635                 goto out_free_context;
636
637         libusb_set_debug((*ctx)->usb_context, 3);
638
639         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
640         if (ret < 0) {
641                 error(*ctx, "scan_devices() failed\n");
642                 am7xxx_shutdown(*ctx);
643                 goto out;
644         }
645
646         /* Set a quieter log level as default for normal operation */
647         (*ctx)->log_level = AM7XXX_LOG_ERROR;
648         return 0;
649
650 out_free_context:
651         free(*ctx);
652         *ctx = NULL;
653 out:
654         return ret;
655 }
656
657 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
658 {
659         am7xxx_device *current;
660
661         if (ctx == NULL) {
662                 fatal("context must not be NULL!\n");
663                 return;
664         }
665
666         current = ctx->devices_list;
667         while (current) {
668                 am7xxx_device *next = current->next;
669                 am7xxx_close_device(current);
670                 free(current);
671                 current = next;
672         }
673
674         libusb_exit(ctx->usb_context);
675         free(ctx);
676         ctx = NULL;
677 }
678
679 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
680 {
681         ctx->log_level = log_level;
682 }
683
684 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
685                        unsigned int device_index)
686 {
687         int ret;
688
689         if (ctx == NULL) {
690                 fatal("context must not be NULL!\n");
691                 return -EINVAL;
692         }
693
694         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
695         if (ret < 0) {
696                 errno = ENODEV;
697         } else if (ret > 0) {
698                 warning(ctx, "device %d already open\n", device_index);
699                 errno = EBUSY;
700                 ret = -EBUSY;
701         }
702
703         return ret;
704 }
705
706 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
707 {
708         if (dev == NULL) {
709                 fatal("dev must not be NULL!\n");
710                 return -EINVAL;
711         }
712         if (dev->usb_device) {
713                 libusb_release_interface(dev->usb_device, 0);
714                 libusb_close(dev->usb_device);
715                 dev->usb_device = NULL;
716         }
717         return 0;
718 }
719
720 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
721                            am7xxx_device_info *device_info)
722 {
723         int ret;
724         struct am7xxx_header h = {
725                 .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
726                 .direction       = AM7XXX_DIRECTION_OUT,
727                 .header_data_len = 0x00,
728                 .unknown2        = 0x3e,
729                 .unknown3        = 0x10,
730                 .header_data = {
731                         .devinfo = {
732                                 .native_width  = 0,
733                                 .native_height = 0,
734                                 .unknown0      = 0,
735                                 .unknown1      = 0,
736                         },
737                 },
738         };
739
740         ret = send_header(dev, &h);
741         if (ret < 0)
742                 return ret;
743
744         ret = read_header(dev, &h);
745         if (ret < 0)
746                 return ret;
747
748         device_info->native_width = h.header_data.devinfo.native_width;
749         device_info->native_height = h.header_data.devinfo.native_height;
750 #if 0
751         /* No reason to expose these in the public API until we know what they mean */
752         device_info->unknown0 = h.header_data.devinfo.unknown0;
753         device_info->unknown1 = h.header_data.devinfo.unknown1;
754 #endif
755
756         return 0;
757 }
758
759 AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
760                                         unsigned int upscale,
761                                         unsigned int original_width,
762                                         unsigned int original_height,
763                                         unsigned int *scaled_width,
764                                         unsigned int *scaled_height)
765 {
766
767         am7xxx_device_info device_info;
768         float width_ratio;
769         float height_ratio;
770         int ret;
771
772         ret = am7xxx_get_device_info(dev, &device_info);
773         if (ret < 0) {
774                 error(dev->ctx, "cannot get device info\n");
775                 return ret;
776         }
777
778         /*
779          * Check if we need to rescale; if the input image fits the native
780          * dimensions there is no need to, unless we want to upscale.
781          */
782         if (!upscale &&
783             original_width <= device_info.native_width &&
784             original_height <= device_info.native_height ) {
785                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
786                 *scaled_width = original_width;
787                 *scaled_height = original_height;
788                 return 0;
789         }
790
791         /* Input dimensions relative to the device native dimensions */
792         width_ratio =  (float)original_width / device_info.native_width;
793         height_ratio = (float)original_height / device_info.native_height;
794
795         if (width_ratio > height_ratio) {
796                 /*
797                  * The input is proportionally "wider" than the device viewport
798                  * so its height needs to be adjusted
799                  */
800                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
801                 *scaled_width = device_info.native_width;
802                 *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
803         } else if (width_ratio < height_ratio) {
804                 /*
805                  * The input is proportionally "taller" than the device viewport
806                  * so its width needs to be adjusted
807                  */
808                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
809                 *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
810                 *scaled_height = device_info.native_height;
811         } else {
812                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
813                 *scaled_width = device_info.native_width;
814                 *scaled_height = device_info.native_height;
815         }
816         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
817
818         return 0;
819 }
820
821 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
822                       am7xxx_image_format format,
823                       unsigned int width,
824                       unsigned int height,
825                       uint8_t *image,
826                       unsigned int image_size)
827 {
828         int ret;
829         struct am7xxx_header h = {
830                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
831                 .direction       = AM7XXX_DIRECTION_OUT,
832                 .header_data_len = sizeof(struct am7xxx_image_header),
833                 .unknown2        = 0x3e,
834                 .unknown3        = 0x10,
835                 .header_data = {
836                         .image = {
837                                 .format     = format,
838                                 .width      = width,
839                                 .height     = height,
840                                 .image_size = image_size,
841                         },
842                 },
843         };
844
845         ret = send_header(dev, &h);
846         if (ret < 0)
847                 return ret;
848
849         if (image == NULL || image_size == 0) {
850                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
851                 return 0;
852         }
853
854         return send_data(dev, image, image_size);
855 }
856
857 AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
858 {
859         int ret;
860         struct am7xxx_header h = {
861                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
862                 .direction       = AM7XXX_DIRECTION_OUT,
863                 .header_data_len = sizeof(struct am7xxx_power_header),
864                 .unknown2        = 0x3e,
865                 .unknown3        = 0x10,
866         };
867
868         switch(power) {
869         case AM7XXX_POWER_OFF:
870                 h.header_data.power.bit2 = 0;
871                 h.header_data.power.bit1 = 0;
872                 h.header_data.power.bit0 = 0;
873                 break;
874
875         case AM7XXX_POWER_LOW:
876                 h.header_data.power.bit2 = 0;
877                 h.header_data.power.bit1 = 0;
878                 h.header_data.power.bit0 = 1;
879                 break;
880
881         case AM7XXX_POWER_MIDDLE:
882                 h.header_data.power.bit2 = 0;
883                 h.header_data.power.bit1 = 1;
884                 h.header_data.power.bit0 = 0;
885                 break;
886
887         case AM7XXX_POWER_HIGH:
888                 h.header_data.power.bit2 = 0;
889                 h.header_data.power.bit1 = 1;
890                 h.header_data.power.bit0 = 1;
891                 break;
892
893         case AM7XXX_POWER_TURBO:
894                 h.header_data.power.bit2 = 1;
895                 h.header_data.power.bit1 = 0;
896                 h.header_data.power.bit0 = 0;
897                 break;
898
899         default:
900                 error(dev->ctx, "Unsupported power mode.\n");
901                 return -EINVAL;
902         };
903
904         ret = send_header(dev, &h);
905         if (ret < 0)
906                 return ret;
907
908         return 0;
909 }
910
911 AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
912 {
913         int ret;
914         struct am7xxx_header h = {
915                 .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
916                 .direction       = AM7XXX_DIRECTION_OUT,
917                 .header_data_len = sizeof(struct am7xxx_zoom_header),
918                 .unknown2        = 0x3e,
919                 .unknown3        = 0x10,
920         };
921
922         switch(zoom) {
923         case AM7XXX_ZOOM_ORIGINAL:
924                 h.header_data.zoom.bit1 = 0;
925                 h.header_data.zoom.bit0 = 0;
926                 break;
927
928         case AM7XXX_ZOOM_H:
929                 h.header_data.zoom.bit1 = 0;
930                 h.header_data.zoom.bit0 = 1;
931                 break;
932
933         case AM7XXX_ZOOM_H_V:
934                 h.header_data.zoom.bit1 = 1;
935                 h.header_data.zoom.bit0 = 0;
936                 break;
937
938         case AM7XXX_ZOOM_TEST:
939                 h.header_data.zoom.bit1 = 1;
940                 h.header_data.zoom.bit0 = 1;
941                 break;
942
943         default:
944                 error(dev->ctx, "Unsupported zoom mode.\n");
945                 return -EINVAL;
946         };
947
948         ret = send_header(dev, &h);
949         if (ret < 0)
950                 return ret;
951
952         return 0;
953 }