src/am7xxx.c

   1 /* am7xxx - communication with AM7xxx based USB Pico Projectors and DPFs
   2  *
   3  * Copyright (C) 2012-2014  Antonio Ospite <ao2@ao2.it>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <stdarg.h>
  23 #include <errno.h>
  24 #include <libusb.h>
  25 #include <math.h>
  26
  27 #include "am7xxx.h"
  28 #include "serialize.h"
  29 #include "tools.h"
  30
  31 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  32
  33 /* If we're not using GNU C, elide __attribute__
  34  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  35  */
  36 #ifndef __GNUC__
  37 #  define  __attribute__(x)  /* NOTHING */
  38 #endif
  39
  40 /* Control shared library symbols visibility */
  41 #if defined _WIN32 || defined __CYGWIN__
  42         #define AM7XXX_PUBLIC __declspec(dllexport)
  43         #define AM7XXX_LOCAL
  44 #else
  45         #if __GNUC__ >= 4
  46                 #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
  47                 #define AM7XXX_LOCAL  __attribute__ ((visibility ("hidden")))
  48         #else
  49                 #define AM7XXX_PUBLIC
  50                 #define AM7XXX_LOCAL
  51         #endif
  52 #endif
  53
  54 static void log_message(am7xxx_context *ctx,
  55                         int level,
  56                         const char *function_name,
  57                         int line,
  58                         const char *fmt,
  59                         ...) __attribute__ ((format (printf, 5, 6)));
  60
  61 #define fatal(...)        log_message(NULL, AM7XXX_LOG_FATAL,   __func__, __LINE__, __VA_ARGS__)
  62 #define error(ctx, ...)   log_message(ctx,  AM7XXX_LOG_ERROR,   __func__, __LINE__, __VA_ARGS__)
  63 #define warning(ctx, ...) log_message(ctx,  AM7XXX_LOG_WARNING, __func__, 0,        __VA_ARGS__)
  64 #define info(ctx, ...)    log_message(ctx,  AM7XXX_LOG_INFO,    __func__, 0,        __VA_ARGS__)
  65 #define debug(ctx, ...)   log_message(ctx,  AM7XXX_LOG_DEBUG,   __func__, 0,        __VA_ARGS__)
  66 #define trace(ctx, ...)   log_message(ctx,  AM7XXX_LOG_TRACE,   NULL,     0,        __VA_ARGS__)
  67
  68 struct am7xxx_ops {
  69         int (*set_power_mode)(am7xxx_device *dev, am7xxx_power_mode power);
  70         int (*set_zoom_mode)(am7xxx_device *dev, am7xxx_zoom_mode zoom);
  71 };
  72
  73 struct am7xxx_usb_device_descriptor {
  74         const char *name;
  75         uint16_t vendor_id;
  76         uint16_t product_id;
  77         uint8_t configuration;    /* The bConfigurationValue of the device */
  78         uint8_t interface_number; /* The bInterfaceNumber of the device */
  79         struct am7xxx_ops ops;
  80 };
  81
  82 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
  83 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power);
  84 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
  85 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
  86
  87 #define DEFAULT_OPS { \
  88         .set_power_mode = default_set_power_mode, \
  89         .set_zoom_mode = default_set_zoom_mode, \
  90 }
  91
  92 static const struct am7xxx_usb_device_descriptor supported_devices[] = {
  93         {
  94                 .name       = "Acer C110",
  95                 .vendor_id  = 0x1de1,
  96                 .product_id = 0xc101,
  97                 .configuration    = 2,
  98                 .interface_number = 0,
  99                 .ops = DEFAULT_OPS,
 100         },
 101         {
 102                 .name       = "Acer C112",
 103                 .vendor_id  = 0x1de1,
 104                 .product_id = 0x5501,
 105                 .configuration    = 2,
 106                 .interface_number = 0,
 107                 .ops = DEFAULT_OPS,
 108         },
 109         {
 110                 .name       ="Aiptek PocketCinema T25",
 111                 .vendor_id  = 0x08ca,
 112                 .product_id = 0x2144,
 113                 .configuration    = 2,
 114                 .interface_number = 0,
 115                 .ops = DEFAULT_OPS,
 116         },
 117         {
 118                 .name       = "Philips/Sagemcom PicoPix 1020",
 119                 .vendor_id  = 0x21e7,
 120                 .product_id = 0x000e,
 121                 .configuration    = 2,
 122                 .interface_number = 0,
 123                 .ops = DEFAULT_OPS,
 124         },
 125         {
 126                 .name       = "Philips/Sagemcom PicoPix 2055",
 127                 .vendor_id  = 0x21e7,
 128                 .product_id = 0x0016,
 129                 .configuration    = 2,
 130                 .interface_number = 0,
 131                 .ops = {
 132                         .set_power_mode = picopix_set_power_mode,
 133                         .set_zoom_mode = picopix_set_zoom_mode,
 134                 },
 135         },
 136         {
 137                 .name       = "Philips/Sagemcom PicoPix 2330",
 138                 .vendor_id  = 0x21e7,
 139                 .product_id = 0x0019,
 140                 .configuration    = 1,
 141                 .interface_number = 0,
 142         },
 143 };
 144
 145 /* The header size on the wire is known to be always 24 bytes, regardless of
 146  * the memory configuration enforced by different architectures or compilers
 147  * for struct am7xxx_header
 148  */
 149 #define AM7XXX_HEADER_WIRE_SIZE 24
 150
 151 struct _am7xxx_device {
 152         libusb_device_handle *usb_device;
 153         struct libusb_transfer *transfer;
 154         int transfer_completed;
 155         uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
 156         am7xxx_device_info *device_info;
 157         am7xxx_context *ctx;
 158         const struct am7xxx_usb_device_descriptor *desc;
 159         am7xxx_device *next;
 160 };
 161
 162 struct _am7xxx_context {
 163         libusb_context *usb_context;
 164         int log_level;
 165         am7xxx_device *devices_list;
 166 };
 167
 168 typedef enum {
 169         AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
 170         AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
 171         AM7XXX_PACKET_TYPE_POWER   = 0x04,
 172         AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
 173         AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW    = 0x15,
 174         AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM = 0x16,
 175         AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH   = 0x17,
 176         AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI    = 0x18,
 177         AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI   = 0x19,
 178 } am7xxx_packet_type;
 179
 180 struct am7xxx_generic_header {
 181         uint32_t field0;
 182         uint32_t field1;
 183         uint32_t field2;
 184         uint32_t field3;
 185 };
 186
 187 struct am7xxx_devinfo_header {
 188         uint32_t native_width;
 189         uint32_t native_height;
 190         uint32_t unknown0;
 191         uint32_t unknown1;
 192 };
 193
 194 struct am7xxx_image_header {
 195         uint32_t format;
 196         uint32_t width;
 197         uint32_t height;
 198         uint32_t image_size;
 199 };
 200
 201 struct am7xxx_power_header {
 202         uint32_t bit2;
 203         uint32_t bit1;
 204         uint32_t bit0;
 205 };
 206
 207 struct am7xxx_zoom_header {
 208         uint32_t bit1;
 209         uint32_t bit0;
 210 };
 211
 212 /*
 213  * Examples of packet headers:
 214  *
 215  * Image header:
 216  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
 217  *
 218  * Power header:
 219  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 220  */
 221
 222 /* Direction of the communication from the host point of view */
 223 #define AM7XXX_DIRECTION_OUT 0 /* host -> device */
 224 #define AM7XXX_DIRECTION_IN  1 /* host <- device */
 225
 226 struct am7xxx_header {
 227         uint32_t packet_type;
 228         uint8_t direction;
 229         uint8_t header_data_len;
 230         uint8_t unknown2;
 231         uint8_t unknown3;
 232         union {
 233                 struct am7xxx_generic_header data;
 234                 struct am7xxx_devinfo_header devinfo;
 235                 struct am7xxx_image_header image;
 236                 struct am7xxx_power_header power;
 237                 struct am7xxx_zoom_header zoom;
 238         } header_data;
 239 };
 240
 241
 242 #ifdef DEBUG
 243 static void debug_dump_generic_header(am7xxx_context *ctx, struct am7xxx_generic_header *g)
 244 {
 245         if (ctx == NULL || g == NULL)
 246                 return;
 247
 248         debug(ctx, "Generic header:\n");
 249         debug(ctx, "\tfield0:  0x%08x (%u)\n", g->field0, g->field0);
 250         debug(ctx, "\tfield1:  0x%08x (%u)\n", g->field1, g->field1);
 251         debug(ctx, "\tfield2:  0x%08x (%u)\n", g->field2, g->field2);
 252         debug(ctx, "\tfield3:  0x%08x (%u)\n", g->field3, g->field3);
 253 }
 254
 255 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
 256 {
 257         if (ctx == NULL || d == NULL)
 258                 return;
 259
 260         debug(ctx, "Info header:\n");
 261         debug(ctx, "\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
 262         debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
 263         debug(ctx, "\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
 264         debug(ctx, "\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
 265 }
 266
 267 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
 268 {
 269         if (ctx == NULL || i == NULL)
 270                 return;
 271
 272         debug(ctx, "Image header:\n");
 273         debug(ctx, "\tformat:     0x%08x (%u)\n", i->format, i->format);
 274         debug(ctx, "\twidth:      0x%08x (%u)\n", i->width, i->width);
 275         debug(ctx, "\theight:     0x%08x (%u)\n", i->height, i->height);
 276         debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
 277 }
 278
 279 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
 280 {
 281         if (ctx == NULL || p == NULL)
 282                 return;
 283
 284         debug(ctx, "Power header:\n");
 285         debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
 286         debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
 287         debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 288 }
 289
 290 static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
 291 {
 292         if (ctx == NULL || z == NULL)
 293                 return;
 294
 295         debug(ctx, "Zoom header:\n");
 296         debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
 297         debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
 298 }
 299
 300 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 301 {
 302         if (ctx == NULL || h == NULL)
 303                 return;
 304
 305         debug(ctx, "BEGIN\n");
 306         debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
 307         debug(ctx, "direction:       0x%02hhx (%hhu) (%s)\n", h->direction, h->direction,
 308               h->direction == AM7XXX_DIRECTION_IN ? "IN" :
 309               h->direction == AM7XXX_DIRECTION_OUT ? "OUT" :
 310               "UNKNOWN");
 311         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
 312         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
 313         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 314
 315         switch(h->packet_type) {
 316         case AM7XXX_PACKET_TYPE_DEVINFO:
 317                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
 318                 break;
 319
 320         case AM7XXX_PACKET_TYPE_IMAGE:
 321                 debug_dump_image_header(ctx, &(h->header_data.image));
 322                 break;
 323
 324         case AM7XXX_PACKET_TYPE_POWER:
 325                 debug_dump_power_header(ctx, &(h->header_data.power));
 326                 break;
 327
 328         case AM7XXX_PACKET_TYPE_ZOOM:
 329                 debug_dump_zoom_header(ctx, &(h->header_data.zoom));
 330                 break;
 331
 332         default:
 333                 debug(ctx, "Parsing data not supported for this packet type!\n");
 334                 debug_dump_generic_header(ctx, &(h->header_data.data));
 335                 break;
 336         }
 337         debug(ctx, "END\n\n");
 338 }
 339
 340 static inline unsigned int in_80chars(unsigned int i)
 341 {
 342         /* The 3 below is the length of "xx " where xx is the hex string
 343          * representation of a byte */
 344         return ((i + 1) % (80 / 3));
 345 }
 346
 347 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 348                               uint8_t *buffer, unsigned int len)
 349 {
 350         unsigned int i;
 351
 352         if (ctx == NULL || buffer == NULL || len == 0)
 353                 return;
 354
 355         trace(ctx, "\n");
 356         if (message)
 357                 trace(ctx, "%s\n", message);
 358
 359         for (i = 0; i < len; i++) {
 360                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
 361         }
 362         trace(ctx, "\n");
 363 }
 364 #else
 365 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 366 {
 367         (void)ctx;
 368         (void)h;
 369 }
 370
 371 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 372                               uint8_t *buffer, unsigned int len)
 373 {
 374         (void)ctx;
 375         (void)message;
 376         (void)buffer;
 377         (void)len;
 378 }
 379 #endif /* DEBUG */
 380
 381 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 382 {
 383         int ret;
 384         int transferred;
 385
 386         transferred = 0;
 387         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
 388         if (ret != 0 || (unsigned int)transferred != len) {
 389                 error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
 390                       libusb_error_name(ret), transferred, len);
 391                 return ret;
 392         }
 393
 394         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
 395
 396         return 0;
 397 }
 398
 399 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 400 {
 401         int ret;
 402         int transferred;
 403
 404         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 405
 406         transferred = 0;
 407         ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
 408         if (ret != 0 || (unsigned int)transferred != len) {
 409                 error(dev->ctx, "%s. Transferred: %d (expected %u)\n",
 410                       libusb_error_name(ret), transferred, len);
 411                 return ret;
 412         }
 413
 414         return 0;
 415 }
 416
 417 static void LIBUSB_CALL send_data_async_complete_cb(struct libusb_transfer *transfer)
 418 {
 419         am7xxx_device *dev = (am7xxx_device *)(transfer->user_data);
 420         int *completed = &(dev->transfer_completed);
 421         int transferred = transfer->actual_length;
 422         int ret;
 423
 424         if (transferred != transfer->length) {
 425                 error(dev->ctx, "transferred: %d (expected %u)\n",
 426                       transferred, transfer->length);
 427         }
 428
 429         switch (transfer->status) {
 430         case LIBUSB_TRANSFER_COMPLETED:
 431                 ret = 0;
 432                 break;
 433         case LIBUSB_TRANSFER_TIMED_OUT:
 434                 ret = LIBUSB_ERROR_TIMEOUT;
 435                 break;
 436         case LIBUSB_TRANSFER_STALL:
 437                 ret = LIBUSB_ERROR_PIPE;
 438                 break;
 439         case LIBUSB_TRANSFER_OVERFLOW:
 440                 ret = LIBUSB_ERROR_OVERFLOW;
 441                 break;
 442         case LIBUSB_TRANSFER_NO_DEVICE:
 443                 ret = LIBUSB_ERROR_NO_DEVICE;
 444                 break;
 445         case LIBUSB_TRANSFER_ERROR:
 446         case LIBUSB_TRANSFER_CANCELLED:
 447                 ret = LIBUSB_ERROR_IO;
 448                 break;
 449         default:
 450                 error(dev->ctx, "unrecognised status code %d", transfer->status);
 451                 ret = LIBUSB_ERROR_OTHER;
 452         }
 453
 454         if (ret < 0)
 455                 error(dev->ctx, "libusb transfer failed: %s",
 456                       libusb_error_name(ret));
 457
 458         libusb_free_transfer(transfer);
 459         transfer = NULL;
 460
 461         *completed = 1;
 462 }
 463
 464 static inline void wait_for_trasfer_completed(am7xxx_device *dev)
 465 {
 466         while (!dev->transfer_completed) {
 467                 int ret = libusb_handle_events_completed(dev->ctx->usb_context,
 468                                                          &(dev->transfer_completed));
 469                 if (ret < 0) {
 470                         if (ret == LIBUSB_ERROR_INTERRUPTED)
 471                                 continue;
 472                         error(dev->ctx, "libusb_handle_events failed: %s, cancelling transfer and retrying",
 473                               libusb_error_name(ret));
 474                         libusb_cancel_transfer(dev->transfer);
 475                         continue;
 476                 }
 477         }
 478 }
 479
 480 static int send_data_async(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 481 {
 482         int ret;
 483         uint8_t *transfer_buffer;
 484
 485         dev->transfer = libusb_alloc_transfer(0);
 486         if (dev->transfer == NULL) {
 487                 error(dev->ctx, "cannot allocate transfer (%s)\n",
 488                       strerror(errno));
 489                 return -ENOMEM;
 490         }
 491
 492         /* Make a copy of the buffer so the caller can safely reuse it just
 493          * after libusb_submit_transfer() has returned. This technique
 494          * requires more dynamic allocations compared to a proper
 495          * double-buffering approach but it takes a lot less code. */
 496         transfer_buffer = malloc(len);
 497         if (transfer_buffer == NULL) {
 498                 error(dev->ctx, "cannot allocate transfer buffer (%s)\n",
 499                       strerror(errno));
 500                 ret = -ENOMEM;
 501                 goto err;
 502         }
 503         memcpy(transfer_buffer, buffer, len);
 504
 505         dev->transfer->flags |= LIBUSB_TRANSFER_FREE_BUFFER;
 506         libusb_fill_bulk_transfer(dev->transfer, dev->usb_device, 0x1,
 507                                   transfer_buffer, len,
 508                                   send_data_async_complete_cb, dev, 0);
 509
 510         /* wait for the previous transfer to complete */
 511         wait_for_trasfer_completed(dev);
 512
 513         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 514
 515         dev->transfer_completed = 0;
 516         ret = libusb_submit_transfer(dev->transfer);
 517         if (ret < 0)
 518                 goto err;
 519
 520         return 0;
 521
 522 err:
 523         libusb_free_transfer(dev->transfer);
 524         dev->transfer = NULL;
 525         return ret;
 526 }
 527
 528 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 529 {
 530         uint8_t **buffer_iterator = &buffer;
 531
 532         put_le32(h->packet_type, buffer_iterator);
 533         put_8(h->direction, buffer_iterator);
 534         put_8(h->header_data_len, buffer_iterator);
 535         put_8(h->unknown2, buffer_iterator);
 536         put_8(h->unknown3, buffer_iterator);
 537         put_le32(h->header_data.data.field0, buffer_iterator);
 538         put_le32(h->header_data.data.field1, buffer_iterator);
 539         put_le32(h->header_data.data.field2, buffer_iterator);
 540         put_le32(h->header_data.data.field3, buffer_iterator);
 541 }
 542
 543 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
 544 {
 545         uint8_t **buffer_iterator = &buffer;
 546
 547         h->packet_type = get_le32(buffer_iterator);
 548         h->direction = get_8(buffer_iterator);
 549         h->header_data_len = get_8(buffer_iterator);
 550         h->unknown2 = get_8(buffer_iterator);
 551         h->unknown3 = get_8(buffer_iterator);
 552         h->header_data.data.field0 = get_le32(buffer_iterator);
 553         h->header_data.data.field1 = get_le32(buffer_iterator);
 554         h->header_data.data.field2 = get_le32(buffer_iterator);
 555         h->header_data.data.field3 = get_le32(buffer_iterator);
 556 }
 557
 558 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 559 {
 560         int ret;
 561
 562         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 563         if (ret < 0)
 564                 goto out;
 565
 566         unserialize_header(dev->buffer, h);
 567
 568         if (h->direction == AM7XXX_DIRECTION_IN) {
 569                 ret = 0;
 570         } else {
 571                 error(dev->ctx,
 572                       "Expected an AM7XXX_DIRECTION_IN packet, got one with direction = %d. Weird!\n",
 573                       h->direction);
 574                 ret = -EINVAL;
 575         }
 576
 577         debug_dump_header(dev->ctx, h);
 578
 579 out:
 580         return ret;
 581 }
 582
 583 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
 584 {
 585         int ret;
 586
 587         debug_dump_header(dev->ctx, h);
 588
 589         /* For symmetry with read_header() we should check here for
 590          * h->direction == AM7XXX_DIRECTION_OUT but we just ensure that in all
 591          * the callers and save some cycles here.
 592          */
 593
 594         serialize_header(h, dev->buffer);
 595
 596         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 597         if (ret < 0)
 598                 error(dev->ctx, "failed to send data\n");
 599
 600         return ret;
 601 }
 602
 603 static int send_command(am7xxx_device *dev, am7xxx_packet_type type)
 604 {
 605         struct am7xxx_header h = {
 606                 .packet_type     = type,
 607                 .direction       = AM7XXX_DIRECTION_OUT,
 608                 .header_data_len = 0x00,
 609                 .unknown2        = 0x3e,
 610                 .unknown3        = 0x10,
 611                 .header_data = {
 612                         .data = {
 613                                 .field0 = 0,
 614                                 .field1 = 0,
 615                                 .field2 = 0,
 616                                 .field3 = 0,
 617                         },
 618                 },
 619         };
 620
 621         return send_header(dev, &h);
 622 }
 623
 624
 625 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
 626  * and print the message unconditionally, this makes it possible to print
 627  * fatal messages even early on initialization, before the context has been
 628  * set up */
 629 static void log_message(am7xxx_context *ctx,
 630                         int level,
 631                         const char *function_name,
 632                         int line,
 633                         const char *fmt,
 634                         ...)
 635 {
 636         va_list ap;
 637
 638         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
 639                 if (function_name) {
 640                         fprintf(stderr, "%s", function_name);
 641                         if (line)
 642                                 fprintf(stderr, "[%d]", line);
 643                         fprintf(stderr, ": ");
 644                 }
 645
 646                 va_start(ap, fmt);
 647                 vfprintf(stderr, fmt, ap);
 648                 va_end(ap);
 649         }
 650
 651         return;
 652 }
 653
 654 static am7xxx_device *add_new_device(am7xxx_context *ctx,
 655                                      const struct am7xxx_usb_device_descriptor *desc)
 656 {
 657         am7xxx_device **devices_list;
 658         am7xxx_device *new_device;
 659
 660         if (ctx == NULL) {
 661                 fatal("context must not be NULL!\n");
 662                 return NULL;
 663         }
 664
 665         new_device = malloc(sizeof(*new_device));
 666         if (new_device == NULL) {
 667                 debug(ctx, "cannot allocate a new device (%s)\n", strerror(errno));
 668                 return NULL;
 669         }
 670         memset(new_device, 0, sizeof(*new_device));
 671
 672         new_device->ctx = ctx;
 673         new_device->desc = desc;
 674         new_device->transfer_completed = 1;
 675
 676         devices_list = &(ctx->devices_list);
 677
 678         if (*devices_list == NULL) {
 679                 *devices_list = new_device;
 680         } else {
 681                 am7xxx_device *prev = *devices_list;
 682                 while (prev->next)
 683                         prev = prev->next;
 684                 prev->next = new_device;
 685         }
 686         return new_device;
 687 }
 688
 689 static am7xxx_device *find_device(am7xxx_context *ctx,
 690                                   unsigned int device_index)
 691 {
 692         unsigned int i = 0;
 693         am7xxx_device *current;
 694
 695         if (ctx == NULL) {
 696                 fatal("context must not be NULL!\n");
 697                 return NULL;
 698         }
 699
 700         current = ctx->devices_list;
 701         while (current && i++ < device_index)
 702                 current = current->next;
 703
 704         return current;
 705 }
 706
 707 static int open_device(am7xxx_context *ctx,
 708                        unsigned int device_index,
 709                        libusb_device *usb_dev,
 710                        am7xxx_device **dev)
 711 {
 712         int ret;
 713         int current_configuration;
 714
 715         *dev = find_device(ctx, device_index);
 716         if (*dev == NULL) {
 717                 ret = -ENODEV;
 718                 goto out;
 719         }
 720
 721         /* the usb device has already been opened */
 722         if ((*dev)->usb_device) {
 723                 ret = 1;
 724                 goto out;
 725         }
 726
 727         ret = libusb_open(usb_dev, &((*dev)->usb_device));
 728         if (ret < 0) {
 729                 debug(ctx, "libusb_open failed: %s\n", libusb_error_name(ret));
 730                 goto out;
 731         }
 732
 733         /* XXX, the device is now open, if any of the calls below fail we need
 734          * to close it again before bailing out.
 735          */
 736
 737         current_configuration = -1;
 738         ret = libusb_get_configuration((*dev)->usb_device,
 739                                        &current_configuration);
 740         if (ret < 0) {
 741                 debug(ctx, "libusb_get_configuration failed: %s\n",
 742                       libusb_error_name(ret));
 743                 goto out_libusb_close;
 744         }
 745
 746         if (current_configuration != (*dev)->desc->configuration) {
 747                 /*
 748                  * In principle, before setting a new configuration, kernel
 749                  * drivers should be detached from _all_ interfaces; for
 750                  * example calling something like the following "invented"
 751                  * function _before_ setting the new configuration:
 752                  *
 753                  *   libusb_detach_all_kernel_drivers((*dev)->usb_device);
 754                  *
 755                  * However, in practice, this is not necessary for most
 756                  * devices as they have only one configuration.
 757                  *
 758                  * When a device only has one configuration:
 759                  *
 760                  *   - if there was a kernel driver bound to the device, it
 761                  *     had already set the configuration and the call below
 762                  *     will be skipped;
 763                  *
 764                  *   - if no kernel driver was bound to the device, the call
 765                  *     below will suceed.
 766                  */
 767                 ret = libusb_set_configuration((*dev)->usb_device,
 768                                                (*dev)->desc->configuration);
 769                 if (ret < 0) {
 770                         debug(ctx, "libusb_set_configuration failed: %s\n",
 771                               libusb_error_name(ret));
 772                         debug(ctx, "Cannot set configuration %hhu\n",
 773                               (*dev)->desc->configuration);
 774                         goto out_libusb_close;
 775                 }
 776         }
 777
 778         libusb_set_auto_detach_kernel_driver((*dev)->usb_device, 1);
 779
 780         ret = libusb_claim_interface((*dev)->usb_device,
 781                                      (*dev)->desc->interface_number);
 782         if (ret < 0) {
 783                 debug(ctx, "libusb_claim_interface failed: %s\n",
 784                       libusb_error_name(ret));
 785                 debug(ctx, "Cannot claim interface %hhu\n",
 786                       (*dev)->desc->interface_number);
 787                 goto out_libusb_close;
 788         }
 789
 790         /* Checking that the configuration has not changed, as suggested in
 791          * http://libusb.sourceforge.net/api-1.0/caveats.html
 792          */
 793         current_configuration = -1;
 794         ret = libusb_get_configuration((*dev)->usb_device,
 795                                        &current_configuration);
 796         if (ret < 0) {
 797                 debug(ctx, "libusb_get_configuration after claim failed: %s\n",
 798                       libusb_error_name(ret));
 799                 goto out_libusb_release_interface;
 800         }
 801
 802         if (current_configuration != (*dev)->desc->configuration) {
 803                 debug(ctx, "libusb configuration changed (expected: %hhu, current: %d)\n",
 804                       (*dev)->desc->configuration, current_configuration);
 805                 ret = -EINVAL;
 806                 goto out_libusb_release_interface;
 807         }
 808 out:
 809         return ret;
 810
 811 out_libusb_release_interface:
 812         libusb_release_interface((*dev)->usb_device,
 813                                  (*dev)->desc->interface_number);
 814 out_libusb_close:
 815         libusb_close((*dev)->usb_device);
 816         (*dev)->usb_device = NULL;
 817         return ret;
 818 }
 819
 820 typedef enum {
 821         SCAN_OP_BUILD_DEVLIST,
 822         SCAN_OP_OPEN_DEVICE,
 823 } scan_op;
 824
 825 /**
 826  * This is where the central logic of multi-device support is.
 827  *
 828  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
 829  * 'dev' are ignored; the function returns 0 on success or a negative value
 830  * on error.
 831  *
 832  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
 833  * device with index 'open_device_index' and returns the correspondent
 834  * am7xxx_device in the 'dev' parameter; the function returns the value from
 835  * open_device(), which is 0 on success, 1 if the device was already open or
 836  * a negative value on error.
 837  *
 838  * NOTES:
 839  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
 840  * the caller might want to call am7xxx_shutdown() in order to remove
 841  * devices possibly added before the failure.
 842  */
 843 static int scan_devices(am7xxx_context *ctx, scan_op op,
 844                         unsigned int open_device_index, am7xxx_device **dev)
 845 {
 846         ssize_t num_devices;
 847         libusb_device **list;
 848         unsigned int current_index;
 849         int i;
 850         int ret;
 851
 852         if (ctx == NULL) {
 853                 fatal("context must not be NULL!\n");
 854                 return -EINVAL;
 855         }
 856         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
 857                 error(ctx, "device scan done already? Abort!\n");
 858                 return -EINVAL;
 859         }
 860
 861         num_devices = libusb_get_device_list(ctx->usb_context, &list);
 862         if (num_devices < 0) {
 863                 ret = -ENODEV;
 864                 goto out;
 865         }
 866
 867         current_index = 0;
 868         for (i = 0; i < num_devices; i++) {
 869                 struct libusb_device_descriptor desc;
 870                 unsigned int j;
 871
 872                 ret = libusb_get_device_descriptor(list[i], &desc);
 873                 if (ret < 0)
 874                         continue;
 875
 876                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
 877                         if (desc.idVendor == supported_devices[j].vendor_id &&
 878                             desc.idProduct == supported_devices[j].product_id) {
 879
 880                                 if (op == SCAN_OP_BUILD_DEVLIST) {
 881                                         am7xxx_device *new_device;
 882                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
 883                                              current_index,
 884                                              supported_devices[j].name);
 885                                         new_device = add_new_device(ctx, &supported_devices[j]);
 886                                         if (new_device == NULL) {
 887                                                 /* XXX, the caller may want
 888                                                  * to call am7xxx_shutdown() if
 889                                                  * we fail here, as we may have
 890                                                  * added some devices already
 891                                                  */
 892                                                 debug(ctx, "Cannot create a new device\n");
 893                                                 ret = -ENODEV;
 894                                                 goto out;
 895                                         }
 896                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
 897                                            current_index == open_device_index) {
 898
 899                                         ret = open_device(ctx,
 900                                                           open_device_index,
 901                                                           list[i],
 902                                                           dev);
 903                                         if (ret < 0)
 904                                                 debug(ctx, "open_device failed\n");
 905
 906                                         /* exit the loop unconditionally after
 907                                          * attempting to open the device
 908                                          * requested by the user */
 909                                         goto out;
 910                                 }
 911                                 current_index++;
 912                         }
 913                 }
 914         }
 915
 916         /* if we made it up to here when op == SCAN_OP_OPEN_DEVICE,
 917          * no devices to open had been found. */
 918         if (op == SCAN_OP_OPEN_DEVICE) {
 919                 error(ctx, "Cannot find any device to open\n");
 920                 ret = -ENODEV;
 921                 goto out;
 922         }
 923
 924         /* everything went fine when building the device list */
 925         ret = 0;
 926 out:
 927         libusb_free_device_list(list, 1);
 928         return ret;
 929 }
 930
 931 /* Device specific operations */
 932
 933 static int default_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
 934 {
 935         int ret;
 936         struct am7xxx_header h = {
 937                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
 938                 .direction       = AM7XXX_DIRECTION_OUT,
 939                 .header_data_len = sizeof(struct am7xxx_power_header),
 940                 .unknown2        = 0x3e,
 941                 .unknown3        = 0x10,
 942         };
 943
 944         switch(power) {
 945         case AM7XXX_POWER_OFF:
 946                 h.header_data.power.bit2 = 0;
 947                 h.header_data.power.bit1 = 0;
 948                 h.header_data.power.bit0 = 0;
 949                 break;
 950
 951         case AM7XXX_POWER_LOW:
 952                 h.header_data.power.bit2 = 0;
 953                 h.header_data.power.bit1 = 0;
 954                 h.header_data.power.bit0 = 1;
 955                 break;
 956
 957         case AM7XXX_POWER_MIDDLE:
 958                 h.header_data.power.bit2 = 0;
 959                 h.header_data.power.bit1 = 1;
 960                 h.header_data.power.bit0 = 0;
 961                 break;
 962
 963         case AM7XXX_POWER_HIGH:
 964                 h.header_data.power.bit2 = 0;
 965                 h.header_data.power.bit1 = 1;
 966                 h.header_data.power.bit0 = 1;
 967                 break;
 968
 969         case AM7XXX_POWER_TURBO:
 970                 h.header_data.power.bit2 = 1;
 971                 h.header_data.power.bit1 = 0;
 972                 h.header_data.power.bit0 = 0;
 973                 break;
 974
 975         default:
 976                 error(dev->ctx, "Unsupported power mode.\n");
 977                 return -EINVAL;
 978         };
 979
 980         ret = send_header(dev, &h);
 981         if (ret < 0)
 982                 return ret;
 983
 984         return 0;
 985 }
 986
 987 static int picopix_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
 988 {
 989         switch(power) {
 990         case AM7XXX_POWER_LOW:
 991                 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_LOW);
 992
 993         case AM7XXX_POWER_MIDDLE:
 994                 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_MEDIUM);
 995
 996         case AM7XXX_POWER_HIGH:
 997                 return send_command(dev, AM7XXX_PACKET_TYPE_PICOPIX_POWER_HIGH);
 998
 999         case AM7XXX_POWER_OFF:
1000         case AM7XXX_POWER_TURBO:
1001         default:
1002                 error(dev->ctx, "Unsupported power mode.\n");
1003                 return -EINVAL;
1004         };
1005 }
1006
1007 static int default_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1008 {
1009         int ret;
1010         struct am7xxx_header h = {
1011                 .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
1012                 .direction       = AM7XXX_DIRECTION_OUT,
1013                 .header_data_len = sizeof(struct am7xxx_zoom_header),
1014                 .unknown2        = 0x3e,
1015                 .unknown3        = 0x10,
1016         };
1017
1018         switch(zoom) {
1019         case AM7XXX_ZOOM_ORIGINAL:
1020                 h.header_data.zoom.bit1 = 0;
1021                 h.header_data.zoom.bit0 = 0;
1022                 break;
1023
1024         case AM7XXX_ZOOM_H:
1025                 h.header_data.zoom.bit1 = 0;
1026                 h.header_data.zoom.bit0 = 1;
1027                 break;
1028
1029         case AM7XXX_ZOOM_H_V:
1030                 h.header_data.zoom.bit1 = 1;
1031                 h.header_data.zoom.bit0 = 0;
1032                 break;
1033
1034         case AM7XXX_ZOOM_TEST:
1035                 h.header_data.zoom.bit1 = 1;
1036                 h.header_data.zoom.bit0 = 1;
1037                 break;
1038
1039         case AM7XXX_ZOOM_TELE:
1040         default:
1041                 error(dev->ctx, "Unsupported zoom mode.\n");
1042                 return -EINVAL;
1043         };
1044
1045         ret = send_header(dev, &h);
1046         if (ret < 0)
1047                 return ret;
1048
1049         return 0;
1050 }
1051
1052 static int picopix_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1053 {
1054         int ret;
1055         am7xxx_packet_type packet_type;
1056
1057         switch(zoom) {
1058         case AM7XXX_ZOOM_ORIGINAL:
1059                 packet_type = AM7XXX_PACKET_TYPE_PICOPIX_DISABLE_TI;
1060                 break;
1061
1062         case AM7XXX_ZOOM_TELE:
1063                 packet_type = AM7XXX_PACKET_TYPE_PICOPIX_ENABLE_TI;
1064                 break;
1065
1066         case AM7XXX_ZOOM_H:
1067         case AM7XXX_ZOOM_H_V:
1068         case AM7XXX_ZOOM_TEST:
1069         default:
1070                 error(dev->ctx, "Unsupported zoom mode.\n");
1071                 return -EINVAL;
1072         };
1073
1074         ret = send_command(dev, packet_type);
1075         if (ret < 0)
1076                 return ret;
1077
1078         /* The Windows drivers wait for 100ms and send the same command again,
1079          * probably to overcome a firmware deficiency */
1080         ret = msleep(100);
1081         if (ret < 0)
1082                 return ret;
1083
1084         return send_command(dev, packet_type);
1085 }
1086
1087 /* Public API */
1088
1089 AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
1090 {
1091         int ret;
1092
1093         *ctx = malloc(sizeof(**ctx));
1094         if (*ctx == NULL) {
1095                 fatal("cannot allocate the context (%s)\n", strerror(errno));
1096                 return -ENOMEM;
1097         }
1098         memset(*ctx, 0, sizeof(**ctx));
1099
1100         /* Set the highest log level during initialization */
1101         (*ctx)->log_level = AM7XXX_LOG_TRACE;
1102
1103         ret = libusb_init(&((*ctx)->usb_context));
1104         if (ret < 0) {
1105                 error(*ctx, "libusb_init failed: %s\n", libusb_error_name(ret));
1106                 goto out_free_context;
1107         }
1108
1109         libusb_set_debug((*ctx)->usb_context, LIBUSB_LOG_LEVEL_INFO);
1110
1111         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
1112         if (ret < 0) {
1113                 error(*ctx, "scan_devices() failed\n");
1114                 am7xxx_shutdown(*ctx);
1115                 goto out;
1116         }
1117
1118         /* Set a quieter log level as default for normal operation */
1119         (*ctx)->log_level = AM7XXX_LOG_ERROR;
1120         return 0;
1121
1122 out_free_context:
1123         free(*ctx);
1124         *ctx = NULL;
1125 out:
1126         return ret;
1127 }
1128
1129 AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
1130 {
1131         am7xxx_device *current;
1132
1133         if (ctx == NULL) {
1134                 fatal("context must not be NULL!\n");
1135                 return;
1136         }
1137
1138         current = ctx->devices_list;
1139         while (current) {
1140                 am7xxx_device *next = current->next;
1141                 am7xxx_close_device(current);
1142                 free(current->device_info);
1143                 free(current);
1144                 current = next;
1145         }
1146
1147         libusb_exit(ctx->usb_context);
1148         free(ctx);
1149         ctx = NULL;
1150 }
1151
1152 AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
1153 {
1154         ctx->log_level = log_level;
1155 }
1156
1157 AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
1158                        unsigned int device_index)
1159 {
1160         int ret;
1161
1162         if (ctx == NULL) {
1163                 fatal("context must not be NULL!\n");
1164                 return -EINVAL;
1165         }
1166
1167         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
1168         if (ret < 0) {
1169                 errno = ENODEV;
1170                 goto out;
1171         } else if (ret > 0) {
1172                 warning(ctx, "device %d already open\n", device_index);
1173                 errno = EBUSY;
1174                 ret = -EBUSY;
1175                 goto out;
1176         }
1177
1178         /* Philips/Sagemcom PicoPix projectors require that the DEVINFO packet
1179          * is the first one to be sent to the device in order for it to
1180          * successfully return the correct device information.
1181          *
1182          * NOTE: am7xxx_get_device_info() will fetch the actual device info
1183          * from the device only the very first time it's called for a given
1184          * device, otherwise, it'll return a cached version of the device info
1185          * (from a previous call to am7xxx_open_device(), for instance).
1186          */
1187         ret = am7xxx_get_device_info(*dev, NULL);
1188         if (ret < 0)
1189                 error(ctx, "cannot get device info\n");
1190
1191 out:
1192         return ret;
1193 }
1194
1195 AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
1196 {
1197         if (dev == NULL) {
1198                 fatal("dev must not be NULL!\n");
1199                 return -EINVAL;
1200         }
1201         if (dev->usb_device) {
1202                 wait_for_trasfer_completed(dev);
1203                 libusb_release_interface(dev->usb_device, dev->desc->interface_number);
1204                 libusb_close(dev->usb_device);
1205                 dev->usb_device = NULL;
1206         }
1207         return 0;
1208 }
1209
1210 AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
1211                            am7xxx_device_info *device_info)
1212 {
1213         int ret;
1214         struct am7xxx_header h;
1215
1216         /* if there is a cached copy of the device info, just return that */
1217         if (dev->device_info)
1218                 goto return_value;
1219
1220         ret = send_command(dev, AM7XXX_PACKET_TYPE_DEVINFO);
1221         if (ret < 0)
1222                 return ret;
1223
1224         memset(&h, 0, sizeof(h));
1225         ret = read_header(dev, &h);
1226         if (ret < 0)
1227                 return ret;
1228
1229         if (h.packet_type != AM7XXX_PACKET_TYPE_DEVINFO) {
1230                 error(dev->ctx, "expected packet type: %d, got %d instead!\n",
1231                       AM7XXX_PACKET_TYPE_DEVINFO, h.packet_type);
1232                 errno = ENOTSUP;
1233                 return -ENOTSUP;
1234         }
1235
1236         dev->device_info = malloc(sizeof(*dev->device_info));
1237         if (dev->device_info == NULL) {
1238                 error(dev->ctx, "cannot allocate a device info (%s)\n",
1239                        strerror(errno));
1240                 return -ENOMEM;
1241         }
1242         memset(dev->device_info, 0, sizeof(*dev->device_info));
1243
1244         dev->device_info->native_width = h.header_data.devinfo.native_width;
1245         dev->device_info->native_height = h.header_data.devinfo.native_height;
1246 #if 0
1247         /* No reason to expose these in the public API until we know what they mean */
1248         dev->device_info->unknown0 = h.header_data.devinfo.unknown0;
1249         dev->device_info->unknown1 = h.header_data.devinfo.unknown1;
1250 #endif
1251
1252 return_value:
1253         if (device_info)
1254                 memcpy(device_info, dev->device_info, sizeof(*device_info));
1255         return 0;
1256 }
1257
1258 AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
1259                                         unsigned int upscale,
1260                                         unsigned int original_width,
1261                                         unsigned int original_height,
1262                                         unsigned int *scaled_width,
1263                                         unsigned int *scaled_height)
1264 {
1265         am7xxx_device_info device_info;
1266         float width_ratio;
1267         float height_ratio;
1268         int ret;
1269
1270         ret = am7xxx_get_device_info(dev, &device_info);
1271         if (ret < 0) {
1272                 error(dev->ctx, "cannot get device info\n");
1273                 return ret;
1274         }
1275
1276         /*
1277          * Check if we need to rescale; if the input image fits the native
1278          * dimensions there is no need to, unless we want to upscale.
1279          */
1280         if (!upscale &&
1281             original_width <= device_info.native_width &&
1282             original_height <= device_info.native_height ) {
1283                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
1284                 *scaled_width = original_width;
1285                 *scaled_height = original_height;
1286                 return 0;
1287         }
1288
1289         /* Input dimensions relative to the device native dimensions */
1290         width_ratio =  (float)original_width / device_info.native_width;
1291         height_ratio = (float)original_height / device_info.native_height;
1292
1293         if (width_ratio > height_ratio) {
1294                 /*
1295                  * The input is proportionally "wider" than the device viewport
1296                  * so its height needs to be adjusted
1297                  */
1298                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
1299                 *scaled_width = device_info.native_width;
1300                 *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
1301         } else if (width_ratio < height_ratio) {
1302                 /*
1303                  * The input is proportionally "taller" than the device viewport
1304                  * so its width needs to be adjusted
1305                  */
1306                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
1307                 *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
1308                 *scaled_height = device_info.native_height;
1309         } else {
1310                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
1311                 *scaled_width = device_info.native_width;
1312                 *scaled_height = device_info.native_height;
1313         }
1314         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
1315
1316         return 0;
1317 }
1318
1319 AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
1320                       am7xxx_image_format format,
1321                       unsigned int width,
1322                       unsigned int height,
1323                       uint8_t *image,
1324                       unsigned int image_size)
1325 {
1326         int ret;
1327         struct am7xxx_header h = {
1328                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
1329                 .direction       = AM7XXX_DIRECTION_OUT,
1330                 .header_data_len = sizeof(struct am7xxx_image_header),
1331                 .unknown2        = 0x3e,
1332                 .unknown3        = 0x10,
1333                 .header_data = {
1334                         .image = {
1335                                 .format     = format,
1336                                 .width      = width,
1337                                 .height     = height,
1338                                 .image_size = image_size,
1339                         },
1340                 },
1341         };
1342
1343         ret = send_header(dev, &h);
1344         if (ret < 0)
1345                 return ret;
1346
1347         if (image == NULL || image_size == 0) {
1348                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1349                 return 0;
1350         }
1351
1352         return send_data(dev, image, image_size);
1353 }
1354
1355 AM7XXX_PUBLIC int am7xxx_send_image_async(am7xxx_device *dev,
1356                                           am7xxx_image_format format,
1357                                           unsigned int width,
1358                                           unsigned int height,
1359                                           uint8_t *image,
1360                                           unsigned int image_size)
1361 {
1362         int ret;
1363         struct am7xxx_header h = {
1364                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
1365                 .direction       = AM7XXX_DIRECTION_OUT,
1366                 .header_data_len = sizeof(struct am7xxx_image_header),
1367                 .unknown2        = 0x3e,
1368                 .unknown3        = 0x10,
1369                 .header_data = {
1370                         .image = {
1371                                 .format     = format,
1372                                 .width      = width,
1373                                 .height     = height,
1374                                 .image_size = image_size,
1375                         },
1376                 },
1377         };
1378
1379         ret = send_header(dev, &h);
1380         if (ret < 0)
1381                 return ret;
1382
1383         if (image == NULL || image_size == 0) {
1384                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
1385                 return 0;
1386         }
1387
1388         return send_data_async(dev, image, image_size);
1389 }
1390
1391 AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power)
1392 {
1393         if (dev->desc->ops.set_power_mode == NULL) {
1394                 warning(dev->ctx,
1395                         "setting power mode is unsupported on this device\n");
1396                 return 0;
1397         }
1398
1399         return dev->desc->ops.set_power_mode(dev, power);
1400 }
1401
1402 AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
1403 {
1404         if (dev->desc->ops.set_zoom_mode == NULL) {
1405                 warning(dev->ctx,
1406                         "setting zoom mode is unsupported on this device\n");
1407                 return 0;
1408         }
1409
1410         return dev->desc->ops.set_zoom_mode(dev, zoom);
1411 }