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 architechtures 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 static void dump_devinfo_header(struct am7xxx_devinfo_header *d)
 150 {
 151         if (d == NULL)
 152                 return;
 153
 154         printf("Info header:\n");
 155         printf("\tnative_width:  0x%08x (%u)\n", d->native_width, d->native_width);
 156         printf("\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
 157         printf("\tunknown0:      0x%08x (%u)\n", d->unknown0, d->unknown0);
 158         printf("\tunknown1:      0x%08x (%u)\n", d->unknown1, d->unknown1);
 159 }
 160
 161 static void dump_image_header(struct am7xxx_image_header *i)
 162 {
 163         if (i == NULL)
 164                 return;
 165
 166         printf("Image header:\n");
 167         printf("\tformat:     0x%08x (%u)\n", i->format, i->format);
 168         printf("\twidth:      0x%08x (%u)\n", i->width, i->width);
 169         printf("\theight:     0x%08x (%u)\n", i->height, i->height);
 170         printf("\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
 171 }
 172
 173 static void dump_power_header(struct am7xxx_power_header *p)
 174 {
 175         if (p == NULL)
 176                 return;
 177
 178         printf("Power header:\n");
 179         printf("\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
 180         printf("\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
 181         printf("\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 182 }
 183
 184 static void dump_header(struct am7xxx_header *h)
 185 {
 186         if (h == NULL)
 187                 return;
 188
 189         printf("packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
 190         printf("unknown0:        0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
 191         printf("header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
 192         printf("unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
 193         printf("unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
 194
 195         switch(h->packet_type) {
 196         case AM7XXX_PACKET_TYPE_DEVINFO:
 197                 dump_devinfo_header(&(h->header_data.devinfo));
 198                 break;
 199
 200         case AM7XXX_PACKET_TYPE_IMAGE:
 201                 dump_image_header(&(h->header_data.image));
 202                 break;
 203
 204         case AM7XXX_PACKET_TYPE_POWER:
 205                 dump_power_header(&(h->header_data.power));
 206                 break;
 207
 208         default:
 209                 printf("Packet type not supported!\n");
 210                 break;
 211         }
 212
 213         fflush(stdout);
 214 }
 215
 216 static inline unsigned int in_80chars(unsigned int i)
 217 {
 218         /* The 3 below is the length of "xx " where xx is the hex string
 219          * representation of a byte */
 220         return ((i+1) % (80/3));
 221 }
 222
 223 static void dump_buffer(uint8_t *buffer, unsigned int len)
 224 {
 225         unsigned int i;
 226
 227         if (buffer == NULL || len == 0)
 228                 return;
 229
 230         for (i = 0; i < len; i++) {
 231                 printf("%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
 232         }
 233         fflush(stdout);
 234 }
 235
 236 static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 237 {
 238         int ret;
 239         int transferred = 0;
 240
 241         ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
 242         if (ret != 0 || (unsigned int)transferred != len) {
 243                 fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n",
 244                         ret, transferred, len);
 245                 return ret;
 246         }
 247
 248 #if DEBUG
 249         printf("\n<-- received\n");
 250         dump_buffer(buffer, len);
 251         printf("\n");
 252 #endif
 253
 254         return 0;
 255 }
 256
 257 static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 258 {
 259         int ret;
 260         int transferred = 0;
 261
 262 #if DEBUG
 263         printf("\nsending -->\n");
 264         dump_buffer(buffer, len);
 265         printf("\n");
 266 #endif
 267
 268         ret = libusb_bulk_transfer(dev->usb_device, 1, buffer, len, &transferred, 0);
 269         if (ret != 0 || (unsigned int)transferred != len) {
 270                 fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n",
 271                         ret, transferred, len);
 272                 return ret;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 279 {
 280         uint8_t **buffer_iterator = &buffer;
 281
 282         put_le32(h->packet_type, buffer_iterator);
 283         put_8(h->unknown0, buffer_iterator);
 284         put_8(h->header_data_len, buffer_iterator);
 285         put_8(h->unknown2, buffer_iterator);
 286         put_8(h->unknown3, buffer_iterator);
 287         put_le32(h->header_data.data.field0, buffer_iterator);
 288         put_le32(h->header_data.data.field1, buffer_iterator);
 289         put_le32(h->header_data.data.field2, buffer_iterator);
 290         put_le32(h->header_data.data.field3, buffer_iterator);
 291 }
 292
 293 static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
 294 {
 295         uint8_t **buffer_iterator = &buffer;
 296
 297         h->packet_type = get_le32(buffer_iterator);
 298         h->unknown0 = get_8(buffer_iterator);
 299         h->header_data_len = get_8(buffer_iterator);
 300         h->unknown2 = get_8(buffer_iterator);
 301         h->unknown3 = get_8(buffer_iterator);
 302         h->header_data.data.field0 = get_le32(buffer_iterator);
 303         h->header_data.data.field1 = get_le32(buffer_iterator);
 304         h->header_data.data.field2 = get_le32(buffer_iterator);
 305         h->header_data.data.field3 = get_le32(buffer_iterator);
 306 }
 307
 308 static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 309 {
 310         int ret;
 311
 312         ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 313         if (ret < 0)
 314                 goto out;
 315
 316         unserialize_header(dev->buffer, h);
 317
 318 #if DEBUG
 319         printf("\n");
 320         dump_header(h);
 321         printf("\n");
 322 #endif
 323
 324         ret = 0;
 325
 326 out:
 327         return ret;
 328 }
 329
 330 static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
 331 {
 332         int ret;
 333
 334 #if DEBUG
 335         printf("\n");
 336         dump_header(h);
 337         printf("\n");
 338 #endif
 339
 340         serialize_header(h, dev->buffer);
 341         ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
 342         if (ret < 0)
 343                 fprintf(stderr, "send_header: failed to send data.\n");
 344
 345         return ret;
 346 }
 347
 348 /* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
 349  * and print the message unconditionally, this makes it possible to print
 350  * fatal messages even early on initialization, before the context has been
 351  * set up */
 352 static void log_message(am7xxx_context *ctx,
 353                         int level,
 354                         const char *function,
 355                         int line,
 356                         const char *fmt,
 357                         ...)
 358 {
 359         va_list ap;
 360
 361         if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
 362                 if (function) {
 363                         fprintf(stderr, "%s", function);
 364                         if (line)
 365                                 fprintf(stderr, "[%d]", line);
 366                         fprintf(stderr, ": ");
 367                 }
 368
 369                 va_start(ap, fmt);
 370                 vfprintf(stderr, fmt, ap);
 371                 va_end(ap);
 372         }
 373
 374         return;
 375 }
 376
 377 static am7xxx_device *add_new_device(am7xxx_context *ctx)
 378 {
 379         am7xxx_device **devices_list;
 380         am7xxx_device *new_device;
 381
 382         if (ctx == NULL) {
 383                 fprintf(stderr, "%s: context must not be NULL!\n", __func__);
 384                 return NULL;
 385         }
 386
 387         devices_list = &(ctx->devices_list);
 388
 389         new_device = malloc(sizeof(*new_device));
 390         if (new_device == NULL) {
 391                 perror("malloc");
 392                 return NULL;
 393         }
 394         memset(new_device, 0, sizeof(*new_device));
 395
 396         new_device->ctx = ctx;
 397
 398         if (*devices_list == NULL) {
 399                 *devices_list = new_device;
 400         } else {
 401                 am7xxx_device *prev = *devices_list;
 402                 while (prev->next)
 403                         prev = prev->next;
 404                 prev->next = new_device;
 405         }
 406         return new_device;
 407 }
 408
 409 static am7xxx_device *find_device(am7xxx_context *ctx,
 410                                   unsigned int device_index)
 411 {
 412         unsigned int i = 0;
 413         am7xxx_device *current;
 414
 415         if (ctx == NULL) {
 416                 fprintf(stderr, "%s: context must not be NULL!\n", __func__);
 417                 return NULL;
 418         }
 419
 420         current = ctx->devices_list;
 421         while (current && i++ < device_index)
 422                 current = current->next;
 423
 424         return current;
 425 }
 426
 427 typedef enum {
 428         SCAN_OP_BUILD_DEVLIST,
 429         SCAN_OP_OPEN_DEVICE,
 430 } scan_op;
 431
 432 /**
 433  * This is where the central logic of multi-device support is.
 434  *
 435  * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
 436  * 'dev' are ignored; the function returns 0 on success and a negative value
 437  * on error.
 438  *
 439  * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
 440  * device with index 'open_device_index' and returns the correspondent
 441  * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
 442  * 1 if the device was already open and a negative value on error.
 443  *
 444  * NOTES:
 445  * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
 446  * the caller might want to call am7xxx_shutdown() in order to remove
 447  * devices possibly added before the failure.
 448  */
 449 static int scan_devices(am7xxx_context *ctx, scan_op op,
 450                         unsigned int open_device_index, am7xxx_device **dev)
 451 {
 452         int num_devices;
 453         libusb_device** list;
 454         unsigned int current_index;
 455         int i;
 456         int ret;
 457
 458         if (ctx == NULL) {
 459                 fprintf(stderr, "%s: context must not be NULL!\n", __func__);
 460                 return -EINVAL;
 461         }
 462         if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
 463                 fprintf(stderr, "%s: device scan done already? Abort!\n", __func__);
 464                 return -EINVAL;
 465         }
 466
 467         num_devices = libusb_get_device_list(ctx->usb_context, &list);
 468         if (num_devices < 0) {
 469                 ret = -ENODEV;
 470                 goto out;
 471         }
 472
 473         current_index = 0;
 474         for (i = 0; i < num_devices; i++) {
 475                 struct libusb_device_descriptor desc;
 476                 unsigned int j;
 477
 478                 ret = libusb_get_device_descriptor(list[i], &desc);
 479                 if (ret < 0)
 480                         continue;
 481
 482                 for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
 483                         if (desc.idVendor == supported_devices[j].vendor_id
 484                             && desc.idProduct == supported_devices[j].product_id) {
 485
 486                                 if (op == SCAN_OP_BUILD_DEVLIST) {
 487                                         am7xxx_device *new_device;
 488                                         /* debug */
 489                                         printf("am7xxx device found, index: %d, name: %s\n",
 490                                                current_index,
 491                                                supported_devices[j].name);
 492                                         new_device = add_new_device(ctx);
 493                                         if (new_device == NULL) {
 494                                                 /* XXX, the caller may want
 495                                                  * to call am7xxx_shutdown() if
 496                                                  * we fail here, as we may have
 497                                                  * added some devices already
 498                                                  */
 499                                                 ret = -ENODEV;
 500                                                 goto out;
 501                                         }
 502                                 } else if (op == SCAN_OP_OPEN_DEVICE &&
 503                                            current_index == open_device_index) {
 504
 505                                         *dev = find_device(ctx, open_device_index);
 506                                         if (*dev == NULL) {
 507                                                 ret = -ENODEV;
 508                                                 goto out;
 509                                         }
 510
 511                                         /* the usb device has already been opened */
 512                                         if ((*dev)->usb_device) {
 513                                                 ret = 1;
 514                                                 goto out;
 515                                         }
 516
 517                                         ret = libusb_open(list[i], &((*dev)->usb_device));
 518                                         if (ret < 0)
 519                                                 goto out;
 520
 521                                         libusb_set_configuration((*dev)->usb_device, 1);
 522                                         libusb_claim_interface((*dev)->usb_device, 0);
 523                                         goto out;
 524                                 }
 525                                 current_index++;
 526                         }
 527                 }
 528         }
 529
 530         /* if we made it up to here we didn't find any device to open */
 531         if (op == SCAN_OP_OPEN_DEVICE) {
 532                 ret = -ENODEV;
 533                 goto out;
 534         }
 535
 536         /* everything went fine when building the device list */
 537         ret = 0;
 538 out:
 539         libusb_free_device_list(list, 1);
 540         return ret;
 541 }
 542
 543 int am7xxx_init(am7xxx_context **ctx)
 544 {
 545         int ret = 0;
 546
 547         *ctx = malloc(sizeof(**ctx));
 548         if (*ctx == NULL) {
 549                 perror("malloc");
 550                 ret = -ENOMEM;
 551                 goto out;
 552         }
 553         memset(*ctx, 0, sizeof(**ctx));
 554
 555         /* Set the highest log level during initialization */
 556         (*ctx)->log_level = AM7XXX_LOG_TRACE;
 557
 558         ret = libusb_init(&((*ctx)->usb_context));
 559         if (ret < 0)
 560                 goto out_free_context;
 561
 562         libusb_set_debug((*ctx)->usb_context, 3);
 563
 564         ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
 565         if (ret < 0) {
 566                 fprintf(stderr, "%s: scan_devices failed\n", __func__);
 567                 am7xxx_shutdown(*ctx);
 568                 goto out;
 569         }
 570
 571         /* Set a quieter log level as default for normal operation */
 572         (*ctx)->log_level = AM7XXX_LOG_ERROR;
 573         return 0;
 574
 575 out_free_context:
 576         free(*ctx);
 577         *ctx = NULL;
 578 out:
 579         return ret;
 580 }
 581
 582 void am7xxx_shutdown(am7xxx_context *ctx)
 583 {
 584         am7xxx_device *current;
 585
 586         if (ctx == NULL) {
 587                 fprintf(stderr, "%s: context must not be NULL!\n", __func__);
 588                 return;
 589         }
 590
 591         current = ctx->devices_list;
 592         while (current) {
 593                 am7xxx_device *next = current->next;
 594                 am7xxx_close_device(current);
 595                 free(current);
 596                 current = next;
 597         }
 598
 599         libusb_exit(ctx->usb_context);
 600         free(ctx);
 601         ctx = NULL;
 602 }
 603
 604 void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
 605 {
 606         ctx->log_level = log_level;
 607 }
 608
 609 int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
 610                        unsigned int device_index)
 611 {
 612         int ret;
 613
 614         if (ctx == NULL) {
 615                 fprintf(stderr, "%s: context must not be NULL!\n", __func__);
 616                 return -EINVAL;
 617         }
 618
 619         ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
 620         if (ret < 0) {
 621                 errno = ENODEV;
 622         } else if (ret > 0) {
 623                 /* warning */
 624                 fprintf(stderr, "%s: device %d already open\n", __func__, device_index);
 625                 errno = EBUSY;
 626                 ret = -EBUSY;
 627         }
 628
 629         return ret;
 630 }
 631
 632 int am7xxx_close_device(am7xxx_device *dev)
 633 {
 634         if (dev == NULL) {
 635                 fprintf(stderr, "%s: dev must not be NULL!\n", __func__);
 636                 return -EINVAL;
 637         }
 638         if (dev->usb_device) {
 639                 libusb_release_interface(dev->usb_device, 0);
 640                 libusb_close(dev->usb_device);
 641                 dev->usb_device = NULL;
 642         }
 643         return 0;
 644 }
 645
 646 int am7xxx_get_device_info(am7xxx_device *dev,
 647                            unsigned int *native_width,
 648                            unsigned int *native_height,
 649                            unsigned int *unknown0,
 650                            unsigned int *unknown1)
 651 {
 652         int ret;
 653         struct am7xxx_header h = {
 654                 .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
 655                 .unknown0        = 0x00,
 656                 .header_data_len = 0x00,
 657                 .unknown2        = 0x3e,
 658                 .unknown3        = 0x10,
 659                 .header_data = {
 660                         .devinfo = {
 661                                 .native_width  = 0,
 662                                 .native_height = 0,
 663                                 .unknown0      = 0,
 664                                 .unknown1      = 0,
 665                         },
 666                 },
 667         };
 668
 669         ret = send_header(dev, &h);
 670         if (ret < 0)
 671                 return ret;
 672
 673         ret = read_header(dev, &h);
 674         if (ret < 0)
 675                 return ret;
 676
 677         *native_width = h.header_data.devinfo.native_width;
 678         *native_height = h.header_data.devinfo.native_height;
 679         *unknown0 = h.header_data.devinfo.unknown0;
 680         *unknown1 = h.header_data.devinfo.unknown1;
 681
 682         return 0;
 683 }
 684
 685 int am7xxx_send_image(am7xxx_device *dev,
 686                       am7xxx_image_format format,
 687                       unsigned int width,
 688                       unsigned int height,
 689                       uint8_t *image,
 690                       unsigned int size)
 691 {
 692         int ret;
 693         struct am7xxx_header h = {
 694                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
 695                 .unknown0        = 0x00,
 696                 .header_data_len = sizeof(struct am7xxx_image_header),
 697                 .unknown2        = 0x3e,
 698                 .unknown3        = 0x10,
 699                 .header_data = {
 700                         .image = {
 701                                 .format     = format,
 702                                 .width      = width,
 703                                 .height     = height,
 704                                 .image_size = size,
 705                         },
 706                 },
 707         };
 708
 709         ret = send_header(dev, &h);
 710         if (ret < 0)
 711                 return ret;
 712
 713         if (image == NULL || size == 0)
 714                 return 0;
 715
 716         return send_data(dev, image, size);
 717 }
 718
 719 int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
 720 {
 721         int ret;
 722         struct am7xxx_header h = {
 723                 .packet_type     = AM7XXX_PACKET_TYPE_POWER,
 724                 .unknown0        = 0x00,
 725                 .header_data_len = sizeof(struct am7xxx_power_header),
 726                 .unknown2        = 0x3e,
 727                 .unknown3        = 0x10,
 728         };
 729
 730         switch(mode) {
 731         case AM7XXX_POWER_OFF:
 732                 h.header_data.power.bit2 = 0;
 733                 h.header_data.power.bit1 = 0;
 734                 h.header_data.power.bit0 = 0;
 735                 break;
 736
 737         case AM7XXX_POWER_LOW:
 738                 h.header_data.power.bit2 = 0;
 739                 h.header_data.power.bit1 = 0;
 740                 h.header_data.power.bit0 = 1;
 741
 742         case AM7XXX_POWER_MIDDLE:
 743                 h.header_data.power.bit2 = 0;
 744                 h.header_data.power.bit1 = 1;
 745                 h.header_data.power.bit0 = 0;
 746                 break;
 747
 748         case AM7XXX_POWER_HIGH:
 749                 h.header_data.power.bit2 = 0;
 750                 h.header_data.power.bit1 = 1;
 751                 h.header_data.power.bit0 = 1;
 752                 break;
 753
 754         case AM7XXX_POWER_TURBO:
 755                 h.header_data.power.bit2 = 1;
 756                 h.header_data.power.bit1 = 0;
 757                 h.header_data.power.bit0 = 0;
 758                 break;
 759
 760         default:
 761                 fprintf(stderr, "Unsupported power mode.\n");
 762                 return -EINVAL;
 763         };
 764
 765         ret = send_header(dev, &h);
 766         if (ret < 0)
 767                 return ret;
 768
 769         return 0;
 770 }