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 }