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 <errno.h>
  22
  23 #include "am7xxx.h"
  24 #include "serialize.h"
  25
  26 #define AM7XXX_VENDOR_ID  0x1de1
  27 #define AM7XXX_PRODUCT_ID 0xc101
  28
  29 static void dump_image_header(struct am7xxx_image_header *i)
  30 {
  31         if (i == NULL)
  32                 return;
  33
  34         printf("Image header:\n");
  35         printf("\tformat:     0x%08x (%u)\n", i->format, i->format);
  36         printf("\twidth:      0x%08x (%u)\n", i->width, i->width);
  37         printf("\theight:     0x%08x (%u)\n", i->height, i->height);
  38         printf("\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
  39 }
  40
  41 static void dump_header(struct am7xxx_header *h)
  42 {
  43         if (h == NULL)
  44                 return;
  45
  46         printf("packet_type:     0x%08x (%u)\n", h->packet_type, h->packet_type);
  47         printf("unknown0:        0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
  48         printf("header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
  49         printf("unknown2:        0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
  50         printf("unknown3:        0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
  51
  52         switch(h->packet_type) {
  53         case AM7XXX_PACKET_TYPE_IMAGE:
  54                 dump_image_header(&(h->header_data.image));
  55                 break;
  56
  57         default:
  58                 printf("Packet type not supported!\n");
  59                 break;
  60         }
  61
  62         fflush(stdout);
  63 }
  64
  65 static inline unsigned int in_80chars(unsigned int i)
  66 {
  67         /* The 3 below is the length of "xx " where xx is the hex string
  68          * representation of a byte */
  69         return ((i+1) % (80/3));
  70 }
  71
  72 static void dump_buffer(uint8_t *buffer, unsigned int len)
  73 {
  74         unsigned int i;
  75
  76         if (buffer == NULL || len == 0)
  77                 return;
  78
  79         for (i = 0; i < len; i++) {
  80                 printf("%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
  81         }
  82         fflush(stdout);
  83 }
  84
  85 static int send_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
  86 {
  87         int ret;
  88         int transferred;
  89
  90 #if DEBUG
  91         dump_buffer(buffer, len);
  92         printf("\n");
  93 #endif
  94
  95         ret = libusb_bulk_transfer(dev, 1, buffer, len, &transferred, 0);
  96         if (ret != 0 || (unsigned int)transferred != len) {
  97                 fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n",
  98                         ret, transferred, len);
  99                 return ret;
 100         }
 101
 102         return 0;
 103 }
 104
 105 static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
 106 {
 107         uint8_t **buffer_iterator = &buffer;
 108
 109         put_le32(h->packet_type, buffer_iterator);
 110         put_8(h->unknown0, buffer_iterator);
 111         put_8(h->header_data_len, buffer_iterator);
 112         put_8(h->unknown2, buffer_iterator);
 113         put_8(h->unknown3, buffer_iterator);
 114         put_le32(h->header_data.data.field0, buffer_iterator);
 115         put_le32(h->header_data.data.field1, buffer_iterator);
 116         put_le32(h->header_data.data.field2, buffer_iterator);
 117         put_le32(h->header_data.data.field3, buffer_iterator);
 118 }
 119
 120 static int send_header(am7xxx_device dev, struct am7xxx_header *h)
 121 {
 122         uint8_t *buffer;
 123         int ret;
 124
 125 #if DEBUG
 126         dump_header(h);
 127         printf("\n");
 128 #endif
 129
 130         buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1);
 131         if (buffer == NULL) {
 132                 perror("calloc buffer");
 133                 return -ENOMEM;
 134         }
 135
 136         serialize_header(h, buffer);
 137         ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
 138         if (ret < 0)
 139                 fprintf(stderr, "send_header: failed to send data.\n");
 140
 141         free(buffer);
 142         return ret;
 143 }
 144
 145 am7xxx_device am7xxx_init(void)
 146 {
 147         am7xxx_device dev;
 148
 149         libusb_init(NULL);
 150         libusb_set_debug(NULL, 3);
 151
 152         dev = libusb_open_device_with_vid_pid(NULL,
 153                                               AM7XXX_VENDOR_ID,
 154                                               AM7XXX_PRODUCT_ID);
 155         if (dev == NULL) {
 156                 errno = ENODEV;
 157                 perror("libusb_open_device_with_vid_pid");
 158                 goto out_libusb_exit;
 159         }
 160
 161         libusb_set_configuration(dev, 1);
 162         libusb_claim_interface(dev, 0);
 163
 164         return dev;
 165
 166 out_libusb_exit:
 167         libusb_exit(NULL);
 168         return NULL;
 169 }
 170
 171 void am7xxx_shutdown(am7xxx_device dev)
 172 {
 173         if (dev) {
 174                 libusb_close(dev);
 175                 libusb_exit(NULL);
 176         }
 177 }
 178
 179 int am7xxx_send_image(am7xxx_device dev,
 180                       am7xxx_image_format format,
 181                       unsigned int width,
 182                       unsigned int height,
 183                       uint8_t *image,
 184                       unsigned int size)
 185 {
 186         int ret;
 187         struct am7xxx_header h = {
 188                 .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
 189                 .unknown0        = 0x00,
 190                 .header_data_len = sizeof(struct am7xxx_image_header),
 191                 .unknown2        = 0x3e,
 192                 .unknown3        = 0x10,
 193                 .header_data = {
 194                         .image = {
 195                                 .format     = format,
 196                                 .width      = width,
 197                                 .height     = height,
 198                                 .image_size = size,
 199                         },
 200                 },
 201         };
 202
 203         ret = send_header(dev, &h);
 204         if (ret < 0)
 205                 return ret;
 206
 207         if (image == NULL || size == 0)
 208                 return 0;
 209
 210         return send_data(dev, image, size);
 211 }