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
  26 #include "am7xxx.h"
  27 #include "serialize.h"
  28
  29 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  30
  31 /* If we're not using GNU C, elide __attribute__
  32  * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
  33  */
  34 #ifndef __GNUC__
  35 #  define  __attribute__(x)  /*NOTHING*/
  36 #endif
  37
  38 static void log_message(am7xxx_context *ctx,
  39                         int level,
  40                         const char *function,
  41                         int line,
  42                         const char *fmt,
  43                         ...) __attribute__ ((format (printf, 5, 6)));
  44
  45 #define fatal(...)        log_message(NULL, AM7XXX_LOG_FATAL,   __func__, __LINE__, __VA_ARGS__)
  46 #define error(ctx, ...)   log_message(ctx,  AM7XXX_LOG_ERROR,   __func__, __LINE__, __VA_ARGS__)
  47 #define warning(ctx, ...) log_message(ctx,  AM7XXX_LOG_WARNING, __func__, 0,        __VA_ARGS__)
  48 #define info(ctx, ...)    log_message(ctx,  AM7XXX_LOG_INFO,    __func__, 0,        __VA_ARGS__)
  49 #define debug(ctx, ...)   log_message(ctx,  AM7XXX_LOG_DEBUG,   __func__, 0,        __VA_ARGS__)
  50 #define trace(ctx, ...)   log_message(ctx,  AM7XXX_LOG_TRACE,   NULL,     0,        __VA_ARGS__)
  51
  52 struct am7xxx_usb_device_descriptor {
  53         const char *name;
  54         uint16_t vendor_id;
  55         uint16_t product_id;
  56 };
  57
  58 static struct am7xxx_usb_device_descriptor supported_devices[] = {
  59         {
  60                 .name       = "Acer C110",
  61                 .vendor_id  = 0x1de1,
  62                 .product_id = 0xc101,
  63         },
  64         {
  65                 .name       = "Philips/Sagemcom PicoPix 1020",
  66                 .vendor_id  = 0x21e7,
  67                 .product_id = 0x000e,
  68         },
  69 };
  70
  71 /* The header size on the wire is known to be always 24 bytes, regardless of
  72  * the memory configuration enforced by different architectures or compilers
  73  * for struct am7xxx_header
  74  */
  75 #define AM7XXX_HEADER_WIRE_SIZE 24
  76
  77 struct _am7xxx_device {
  78         libusb_device_handle *usb_device;
  79         uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
  80         am7xxx_context *ctx;
  81         am7xxx_device *next;
  82 };
  83
  84 struct _am7xxx_context {
  85         libusb_context *usb_context;
  86         int log_level;
  87         am7xxx_device *devices_list;
  88 };
  89
  90 typedef enum {
  91         AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
  92         AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
  93         AM7XXX_PACKET_TYPE_POWER   = 0x04,
  94         AM7XXX_PACKET_TYPE_UNKNOWN = 0x05,
  95 } am7xxx_packet_type;
  96
  97 struct am7xxx_generic_header {
  98         uint32_t field0;
  99         uint32_t field1;
 100         uint32_t field2;
 101         uint32_t field3;
 102 };
 103
 104 struct am7xxx_devinfo_header {
 105         uint32_t native_width;
 106         uint32_t native_height;
 107         uint32_t unknown0;
 108         uint32_t unknown1;
 109 };
 110
 111 struct am7xxx_image_header {
 112         uint32_t format;
 113         uint32_t width;
 114         uint32_t height;
 115         uint32_t image_size;
 116 };
 117
 118 struct am7xxx_power_header {
 119         uint32_t bit2;
 120         uint32_t bit1;
 121         uint32_t bit0;
 122 };
 123
 124 /*
 125  * Examples of packet headers:
 126  *
 127  * Image header:
 128  * 02 00 00 00 00 10 3e 10 01 00 00 00 20 03 00 00 e0 01 00 00 53 E8 00 00
 129  *
 130  * Power header:
 131  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 132  */
 133
 134 struct am7xxx_header {
 135         uint32_t packet_type;
 136         uint8_t unknown0;
 137         uint8_t header_data_len;
 138         uint8_t unknown2;
 139         uint8_t unknown3;
 140         union {
 141                 struct am7xxx_generic_header data;
 142                 struct am7xxx_devinfo_header devinfo;
 143                 struct am7xxx_image_header image;
 144                 struct am7xxx_power_header power;
 145         } header_data;
 146 };
 147
 148
 149 #ifdef DEBUG
 150 static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
 151 {
 152         if (ctx == NULL || d == NULL)
 153                 return;
 154
 155         debug(ctx, "Info header:\n");
 156         debug(ctx, "\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
 157         debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
 158         debug(ctx, "\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
 159         debug(ctx, "\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
 160 }
 161
 162 static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
 163 {
 164         if (ctx == NULL || i == NULL)
 165                 return;
 166
 167         debug(ctx, "Image header:\n");
 168         debug(ctx, "\tformat:     0x%08x (%u)\n", i->format, i->format);
 169         debug(ctx, "\twidth:      0x%08x (%u)\n", i->width, i->width);
 170         debug(ctx, "\theight:     0x%08x (%u)\n", i->height, i->height);
 171         debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
 172 }
 173
 174 static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
 175 {
 176         if (ctx == NULL || p == NULL)
 177                 return;
 178
 179         debug(ctx, "Power header:\n");
 180         debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
 181         debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
 182         debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 183 }
 184
 185 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 186 {
 187         if (ctx == NULL || h == NULL)
 188                 return;
 189
 190         debug(ctx, "BEGIN\n");
 191         debug(ctx, "packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
 192         debug(ctx, "unknown0:        0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
 193         debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
 194         debug(ctx, "unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
 195         debug(ctx, "unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 196
 197         switch(h->packet_type) {
 198         case AM7XXX_PACKET_TYPE_DEVINFO:
 199                 debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
 200                 break;
 201
 202         case AM7XXX_PACKET_TYPE_IMAGE:
 203                 debug_dump_image_header(ctx, &(h->header_data.image));
 204                 break;
 205
 206         case AM7XXX_PACKET_TYPE_POWER:
 207                 debug_dump_power_header(ctx, &(h->header_data.power));
 208                 break;
 209
 210         default:
 211                 debug(ctx, "Packet type not supported!\n");
 212                 break;
 213         }
 214         debug(ctx, "END\n\n");
 215 }
 216
 217 static inline unsigned int in_80chars(unsigned int i)
 218 {
 219         /* The 3 below is the length of "xx " where xx is the hex string
 220          * representation of a byte */
 221         return ((i+1) % (80/3));
 222 }
 223
 224 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 225                               uint8_t *buffer, unsigned int len)
 226 {
 227         unsigned int i;
 228
 229         if (ctx == NULL || buffer == NULL || len == 0)
 230                 return;
 231
 232         trace(ctx, "\n");
 233         if (message)
 234                 trace(ctx, "%s\n", message);
 235
 236         for (i = 0; i < len; i++) {
 237                 trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
 238         }
 239         trace(ctx, "\n");
 240 }
 241 #else
 242 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 243 {
 244         (void)ctx;
 245         (void)h;
 246 }
 247
 248 static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
 249                               uint8_t *buffer, unsigned int len)
 250 {
 251         (void)ctx;
 252         (void)message;
 253         (void)buffer;
 254         (void)len;
 255 }
 256 #endif /* DEBUG */
 257
 258 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 259 {
 260         int ret;
 261         int transferred = 0;
 262
 263         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
 264         if (ret != 0 || (unsigned int)transferred != len) {
 265                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
 266                       ret, transferred, len);
 267                 return ret;
 268         }
 269
 270         trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
 271
 272         return 0;
 273 }
 274
 275 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 276 {
 277         int ret;
 278         int transferred = 0;
 279
 280         trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 281
 282         ret = libusb_bulk_transfer(dev->usb_device, 1, buffer, len, &transferred, 0);
 283         if (ret != 0 || (unsigned int)transferred != len) {
 284                 error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
 285                       ret, transferred, len);
 286                 return ret;
 287         }
 288
 289         return 0;
 290 }
 291
 292 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 293 {
 294         uint8_t **buffer_iterator = &buffer;
 295
 296         put_le32(h->packet_type, buffer_iterator);
 297         put_8(h->unknown0, buffer_iterator);
 298         put_8(h->header_data_len, buffer_iterator);
 299         put_8(h->unknown2, buffer_iterator);
 300         put_8(h->unknown3, buffer_iterator);
 301         put_le32(h->header_data.data.field0, buffer_iterator);
 302         put_le32(h->header_data.data.field1, buffer_iterator);
 303         put_le32(h->header_data.data.field2, buffer_iterator);
 304         put_le32(h->header_data.data.field3, buffer_iterator);
 305 }
 306
 307 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
 308 {
 309         uint8_t **buffer_iterator = &buffer;
 310
 311         h->packet_type = get_le32(buffer_iterator);
 312         h->unknown0 = get_8(buffer_iterator);
 313         h->header_data_len = get_8(buffer_iterator);
 314         h->unknown2 = get_8(buffer_iterator);
 315         h->unknown3 = get_8(buffer_iterator);
 316         h->header_data.data.field0 = get_le32(buffer_iterator);
 317         h->header_data.data.field1 = get_le32(buffer_iterator);
 318         h->header_data.data.field2 = get_le32(buffer_iterator);
 319         h->header_data.data.field3 = get_le32(buffer_iterator);
 320 }
 321
 322 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 323 {
 324         int ret;
 325
 326         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 327         if (ret < 0)
 328                 goto out;
 329
 330         unserialize_header(dev->buffer, h);
 331
 332         debug_dump_header(dev->ctx, h);
 333
 334         ret = 0;
 335
 336 out:
 337         return ret;
 338 }
 339
 340 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
 341 {
 342         int ret;
 343
 344         debug_dump_header(dev->ctx, h);
 345
 346         serialize_header(h, dev->buffer);
 347         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 348         if (ret < 0)
 349                 error(dev->ctx, "failed to send data\n");
 350
 351         return ret;
 352 }
 353
 354 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
 355  * and print the message unconditionally, this makes it possible to print
 356  * fatal messages even early on initialization, before the context has been
 357  * set up */
 358 static void log_message(am7xxx_context *ctx,
 359                         int level,
 360                         const char *function,
 361                         int line,
 362                         const char *fmt,
 363                         ...)
 364 {
 365         va_list ap;
 366
 367         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
 368                 if (function) {
 369                         fprintf(stderr, "%s", function);
 370                         if (line)
 371                                 fprintf(stderr, "[%d]", line);
 372                         fprintf(stderr, ": ");
 373                 }
 374
 375                 va_start(ap, fmt);
 376                 vfprintf(stderr, fmt, ap);
 377                 va_end(ap);
 378         }
 379
 380         return;
 381 }
 382
 383 static am7xxx_device *add_new_device(am7xxx_context *ctx)
 384 {
 385         am7xxx_device **devices_list;
 386         am7xxx_device *new_device;
 387
 388         if (ctx == NULL) {
 389                 fatal("context must not be NULL!\n");
 390                 return NULL;
 391         }
 392
 393         devices_list = &(ctx->devices_list);
 394
 395         new_device = malloc(sizeof(*new_device));
 396         if (new_device == NULL) {
 397                 fatal("cannot allocate a new device (%s)\n", strerror(errno));
 398                 return NULL;
 399         }
 400         memset(new_device, 0, sizeof(*new_device));
 401
 402         new_device->ctx = ctx;
 403
 404         if (*devices_list == NULL) {
 405                 *devices_list = new_device;
 406         } else {
 407                 am7xxx_device *prev = *devices_list;
 408                 while (prev->next)
 409                         prev = prev->next;
 410                 prev->next = new_device;
 411         }
 412         return new_device;
 413 }
 414
 415 static am7xxx_device *find_device(am7xxx_context *ctx,
 416                                   unsigned int device_index)
 417 {
 418         unsigned int i = 0;
 419         am7xxx_device *current;
 420
 421         if (ctx == NULL) {
 422                 fatal("context must not be NULL!\n");
 423                 return NULL;
 424         }
 425
 426         current = ctx->devices_list;
 427         while (current && i++ < device_index)
 428                 current = current->next;
 429
 430         return current;
 431 }
 432
 433 typedef enum {
 434         SCAN_OP_BUILD_DEVLIST,
 435         SCAN_OP_OPEN_DEVICE,
 436 } scan_op;
 437
 438 /**
 439  * This is where the central logic of multi-device support is.
 440  *
 441  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
 442  * 'dev' are ignored; the function returns 0 on success and a negative value
 443  * on error.
 444  *
 445  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
 446  * device with index 'open_device_index' and returns the correspondent
 447  * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
 448  * 1 if the device was already open and a negative value on error.
 449  *
 450  * NOTES:
 451  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
 452  * the caller might want to call am7xxx_shutdown() in order to remove
 453  * devices possibly added before the failure.
 454  */
 455 static int scan_devices(am7xxx_context *ctx, scan_op op,
 456                         unsigned int open_device_index, am7xxx_device **dev)
 457 {
 458         int num_devices;
 459         libusb_device** list;
 460         unsigned int current_index;
 461         int i;
 462         int ret;
 463
 464         if (ctx == NULL) {
 465                 fatal("context must not be NULL!\n");
 466                 return -EINVAL;
 467         }
 468         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
 469                 error(ctx, "device scan done already? Abort!\n");
 470                 return -EINVAL;
 471         }
 472
 473         num_devices = libusb_get_device_list(ctx->usb_context, &list);
 474         if (num_devices < 0) {
 475                 ret = -ENODEV;
 476                 goto out;
 477         }
 478
 479         current_index = 0;
 480         for (i = 0; i < num_devices; i++) {
 481                 struct libusb_device_descriptor desc;
 482                 unsigned int j;
 483
 484                 ret = libusb_get_device_descriptor(list[i], &desc);
 485                 if (ret < 0)
 486                         continue;
 487
 488                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
 489                         if (desc.idVendor == supported_devices[j].vendor_id
 490                             && desc.idProduct == supported_devices[j].product_id) {
 491
 492                                 if (op == SCAN_OP_BUILD_DEVLIST) {
 493                                         am7xxx_device *new_device;
 494                                         info(ctx, "am7xxx device found, index: %d, name: %s\n",
 495                                              current_index,
 496                                              supported_devices[j].name);
 497                                         new_device = add_new_device(ctx);
 498                                         if (new_device == NULL) {
 499                                                 /* XXX, the caller may want
 500                                                  * to call am7xxx_shutdown() if
 501                                                  * we fail here, as we may have
 502                                                  * added some devices already
 503                                                  */
 504                                                 debug(ctx, "Cannot create a new device\n");
 505                                                 ret = -ENODEV;
 506                                                 goto out;
 507                                         }
 508                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
 509                                            current_index == open_device_index) {
 510
 511                                         *dev = find_device(ctx, open_device_index);
 512                                         if (*dev == NULL) {
 513                                                 ret = -ENODEV;
 514                                                 goto out;
 515                                         }
 516
 517                                         /* the usb device has already been opened */
 518                                         if ((*dev)->usb_device) {
 519                                                 debug(ctx, "(*dev)->usb_device already set\n");
 520                                                 ret = 1;
 521                                                 goto out;
 522                                         }
 523
 524                                         ret = libusb_open(list[i], &((*dev)->usb_device));
 525                                         if (ret < 0) {
 526                                                 debug(ctx, "libusb_open failed\n");
 527                                                 goto out;
 528                                         }
 529
 530                                         libusb_set_configuration((*dev)->usb_device, 1);
 531                                         libusb_claim_interface((*dev)->usb_device, 0);
 532                                         goto out;
 533                                 }
 534                                 current_index++;
 535                         }
 536                 }
 537         }
 538
 539         /* if we made it up to here we didn't find any device to open */
 540         if (op == SCAN_OP_OPEN_DEVICE) {
 541                 error(ctx, "Cannot find any device to open\n");
 542                 ret = -ENODEV;
 543                 goto out;
 544         }
 545
 546         /* everything went fine when building the device list */
 547         ret = 0;
 548 out:
 549         libusb_free_device_list(list, 1);
 550         return ret;
 551 }
 552
 553 int am7xxx_init(am7xxx_context **ctx)
 554 {
 555         int ret = 0;
 556
 557         *ctx = malloc(sizeof(**ctx));
 558         if (*ctx == NULL) {
 559                 fatal("cannot allocate the context (%s)\n", strerror(errno));
 560                 ret = -ENOMEM;
 561                 goto out;
 562         }
 563         memset(*ctx, 0, sizeof(**ctx));
 564
 565         /* Set the highest log level during initialization */
 566         (*ctx)->log_level = AM7XXX_LOG_TRACE;
 567
 568         ret = libusb_init(&((*ctx)->usb_context));
 569         if (ret < 0)
 570                 goto out_free_context;
 571
 572         libusb_set_debug((*ctx)->usb_context, 3);
 573
 574         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
 575         if (ret < 0) {
 576                 error(*ctx, "scan_devices() failed\n");
 577                 am7xxx_shutdown(*ctx);
 578                 goto out;
 579         }
 580
 581         /* Set a quieter log level as default for normal operation */
 582         (*ctx)->log_level = AM7XXX_LOG_ERROR;
 583         return 0;
 584
 585 out_free_context:
 586         free(*ctx);
 587         *ctx = NULL;
 588 out:
 589         return ret;
 590 }
 591
 592 void am7xxx_shutdown(am7xxx_context *ctx)
 593 {
 594         am7xxx_device *current;
 595
 596         if (ctx == NULL) {
 597                 fatal("context must not be NULL!\n");
 598                 return;
 599         }
 600
 601         current = ctx->devices_list;
 602         while (current) {
 603                 am7xxx_device *next = current->next;
 604                 am7xxx_close_device(current);
 605                 free(current);
 606                 current = next;
 607         }
 608
 609         libusb_exit(ctx->usb_context);
 610         free(ctx);
 611         ctx = NULL;
 612 }
 613
 614 void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
 615 {
 616         ctx->log_level = log_level;
 617 }
 618
 619 int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
 620                        unsigned int device_index)
 621 {
 622         int ret;
 623
 624         if (ctx == NULL) {
 625                 fatal("context must not be NULL!\n");
 626                 return -EINVAL;
 627         }
 628
 629         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
 630         if (ret < 0) {
 631                 errno = ENODEV;
 632         } else if (ret > 0) {
 633                 warning(ctx, "device %d already open\n", device_index);
 634                 errno = EBUSY;
 635                 ret = -EBUSY;
 636         }
 637
 638         return ret;
 639 }
 640
 641 int am7xxx_close_device(am7xxx_device *dev)
 642 {
 643         if (dev == NULL) {
 644                 fatal("dev must not be NULL!\n");
 645                 return -EINVAL;
 646         }
 647         if (dev->usb_device) {
 648                 libusb_release_interface(dev->usb_device, 0);
 649                 libusb_close(dev->usb_device);
 650                 dev->usb_device = NULL;
 651         }
 652         return 0;
 653 }
 654
 655 int am7xxx_get_device_info(am7xxx_device *dev,
 656                            am7xxx_device_info *device_info)
 657 {
 658         int ret;
 659         struct am7xxx_header h = {
 660                 .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
 661                 .unknown0        = 0x00,
 662                 .header_data_len = 0x00,
 663                 .unknown2        = 0x3e,
 664                 .unknown3        = 0x10,
 665                 .header_data = {
 666                         .devinfo = {
 667                                 .native_width  = 0,
 668                                 .native_height = 0,
 669                                 .unknown0      = 0,
 670                                 .unknown1      = 0,
 671                         },
 672                 },
 673         };
 674
 675         ret = send_header(dev, &h);
 676         if (ret < 0)
 677                 return ret;
 678
 679         ret = read_header(dev, &h);
 680         if (ret < 0)
 681                 return ret;
 682
 683         device_info->native_width = h.header_data.devinfo.native_width;
 684         device_info->native_height = h.header_data.devinfo.native_height;
 685 #if 0
 686         /* No reason to expose these in the public API until we know what they mean */
 687         device_info->unknown0 = h.header_data.devinfo.unknown0;
 688         device_info->unknown1 = h.header_data.devinfo.unknown1;
 689 #endif
 690
 691         return 0;
 692 }
 693
 694 int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
 695                                         unsigned int upscale,
 696                                         unsigned int original_width,
 697                                         unsigned int original_height,
 698                                         unsigned int *scaled_width,
 699                                         unsigned int *scaled_height)
 700 {
 701
 702         am7xxx_device_info device_info;
 703         float width_ratio;
 704         float height_ratio;
 705         int ret;
 706
 707         ret = am7xxx_get_device_info(dev, &device_info);
 708         if (ret < 0) {
 709                 error(dev->ctx, "cannot get device info\n");
 710                 return ret;
 711         }
 712
 713         /*
 714          * Check if we need to rescale; if the input image fits the native
 715          * dimensions there is no need to, unless we want to upscale.
 716          */
 717         if (!upscale &&
 718             original_width <= device_info.native_width &&
 719             original_height <= device_info.native_height ) {
 720                 debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
 721                 *scaled_width = original_width;
 722                 *scaled_height = original_height;
 723                 return 0;
 724         }
 725
 726         /* Input dimensions relative to the device native dimensions */
 727         width_ratio =  (float)original_width / device_info.native_width;
 728         height_ratio = (float)original_height / device_info.native_height;
 729
 730         if (width_ratio > height_ratio) {
 731                 /*
 732                  * The input is proportionally "wider" than the device viewport
 733                  * so its height needs to be adjusted
 734                  */
 735                 debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
 736                 *scaled_width = device_info.native_width;
 737                 *scaled_height = (unsigned int)(original_height / width_ratio);
 738         } else if (width_ratio < height_ratio) {
 739                 /*
 740                  * The input is proportionally "taller" than the device viewport
 741                  * so its width needs to be adjusted
 742                  */
 743                 debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
 744                 *scaled_width = (unsigned int)(original_width / height_ratio);
 745                 *scaled_height = device_info.native_height;
 746         } else {
 747                 debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
 748                 *scaled_width = device_info.native_width;
 749                 *scaled_height = device_info.native_height;
 750         }
 751         debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
 752
 753         return 0;
 754 }
 755
 756 int am7xxx_send_image(am7xxx_device *dev,
 757                       am7xxx_image_format format,
 758                       unsigned int width,
 759                       unsigned int height,
 760                       uint8_t *image,
 761                       unsigned int image_size)
 762 {
 763         int ret;
 764         struct am7xxx_header h = {
 765                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
 766                 .unknown0        = 0x00,
 767                 .header_data_len = sizeof(struct am7xxx_image_header),
 768                 .unknown2        = 0x3e,
 769                 .unknown3        = 0x10,
 770                 .header_data = {
 771                         .image = {
 772                                 .format     = format,
 773                                 .width      = width,
 774                                 .height     = height,
 775                                 .image_size = image_size,
 776                         },
 777                 },
 778         };
 779
 780         ret = send_header(dev, &h);
 781         if (ret < 0)
 782                 return ret;
 783
 784         if (image == NULL || image_size == 0) {
 785                 warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
 786                 return 0;
 787         }
 788
 789         return send_data(dev, image, image_size);
 790 }
 791
 792 int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
 793 {
 794         int ret;
 795         struct am7xxx_header h = {
 796                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
 797                 .unknown0        = 0x00,
 798                 .header_data_len = sizeof(struct am7xxx_power_header),
 799                 .unknown2        = 0x3e,
 800                 .unknown3        = 0x10,
 801         };
 802
 803         switch(mode) {
 804         case AM7XXX_POWER_OFF:
 805                 h.header_data.power.bit2 = 0;
 806                 h.header_data.power.bit1 = 0;
 807                 h.header_data.power.bit0 = 0;
 808                 break;
 809
 810         case AM7XXX_POWER_LOW:
 811                 h.header_data.power.bit2 = 0;
 812                 h.header_data.power.bit1 = 0;
 813                 h.header_data.power.bit0 = 1;
 814
 815         case AM7XXX_POWER_MIDDLE:
 816                 h.header_data.power.bit2 = 0;
 817                 h.header_data.power.bit1 = 1;
 818                 h.header_data.power.bit0 = 0;
 819                 break;
 820
 821         case AM7XXX_POWER_HIGH:
 822                 h.header_data.power.bit2 = 0;
 823                 h.header_data.power.bit1 = 1;
 824                 h.header_data.power.bit0 = 1;
 825                 break;
 826
 827         case AM7XXX_POWER_TURBO:
 828                 h.header_data.power.bit2 = 1;
 829                 h.header_data.power.bit1 = 0;
 830                 h.header_data.power.bit0 = 0;
 831                 break;
 832
 833         default:
 834                 error(dev->ctx, "Power mode not supported!\n");
 835                 return -EINVAL;
 836         };
 837
 838         ret = send_header(dev, &h);
 839         if (ret < 0)
 840                 return ret;
 841
 842         return 0;
 843 }