1 | /* CrO2 datassette emulator
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2 | * Copyright 2012, Adrien Destugues <pulkomandy@pulkomandy.ath.cx>
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3 | *
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4 | * Distributed under the terms of the MIT licence.
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5 | *
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6 | * Handles device communication through libusb
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7 | */
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8 |
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9 | #include "device.h"
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10 |
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11 | #include <iostream> // TODO remove
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12 |
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13 | bool Device::initOnce = false;
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14 |
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15 | const uint32_t Device::vid = 0x16C0;
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16 | const uint32_t Device::pid = 0x05DC;
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17 | const char* Device::vendor = "pulkomandy.ath.cx";
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18 | const char* Device::product = "CrO2";
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19 |
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20 | /* These are the vendor specific commands implemented by our USB device */
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21 | #define PSCMD_CONFIG 0
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22 | #define PSCMD_GET 1
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23 | #define PSCMD_PUT 2
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24 | #define PSCMD_STATUS 3
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25 |
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26 | /* USB device lookup by VID and PID, then Vendor and Product strings, as we use V-USB shared ID. */
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27 | static int usbGetStringAscii(usb_dev_handle *dev, int index, int langid, char *buf, int buflen)
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28 | {
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29 | char buffer[256];
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30 | int rval, i;
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31 |
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32 | if((rval = usb_control_msg(dev, USB_ENDPOINT_IN, USB_REQ_GET_DESCRIPTOR, (USB_DT_STRING << 8) + index, langid, buffer, sizeof(buffer), 1000)) < 0)
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33 | return rval;
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34 | if(buffer[1] != USB_DT_STRING)
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35 | return 0;
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36 | if((unsigned char)buffer[0] < rval)
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37 | rval = (unsigned char)buffer[0];
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38 | rval /= 2;
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39 | /* lossy conversion to ISO Latin1 */
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40 | for(i=1;i<rval;i++){
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41 | if(i > buflen) /* destination buffer overflow */
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42 | break;
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43 | buf[i-1] = buffer[2 * i];
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44 | if(buffer[2 * i + 1] != 0) /* outside of ISO Latin1 range */
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45 | buf[i-1] = '?';
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46 | }
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47 | buf[i-1] = 0;
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48 | return i-1;
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49 | }
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50 |
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51 | Device::Device()
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52 | {
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53 | handle = NULL;
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54 |
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55 | if (!initOnce)
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56 | {
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57 | initOnce = true;
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58 | usb_init();
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59 | }
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60 |
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61 | usb_find_busses();
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62 | usb_find_devices();
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63 |
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64 | for(struct usb_bus* bus=usb_get_busses(); bus; bus=bus->next)
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65 | {
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66 | for(struct usb_device* dev=bus->devices; dev; dev=dev->next)
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67 | {
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68 | if(dev->descriptor.idVendor != vid || dev->descriptor.idProduct != pid)
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69 | continue;
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70 |
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71 | // Found device with correct VID and PID. Now try to match the strings
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72 | char string[256];
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73 | int len;
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74 | handle = usb_open(dev); /* we need to open the device in order to query strings */
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75 | if(!handle){
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76 | std::cerr << "Warning: cannot open USB device: " << usb_strerror() << std::endl;
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77 | continue;
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78 | }
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79 | /* now check whether the names match: */
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80 | len = usbGetStringAscii(handle, dev->descriptor.iManufacturer, 0x0409, string, sizeof(string));
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81 | if(len < 0)
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82 | {
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83 | std::cerr << "Warning: cannot query manufacturer for device: " << usb_strerror() << std::endl;
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84 | }
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85 | else
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86 | {
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87 | if(strcmp(string, vendor) == 0){
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88 | len = usbGetStringAscii(handle, dev->descriptor.iProduct, 0x0409, string, sizeof(string));
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89 | if(len < 0){
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90 | std::cerr << "Warning: cannot query product for device: " << usb_strerror() << std::endl;
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91 | }else{
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92 | if(strcmp(string, product) == 0)
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93 | break;
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94 | }
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95 | }
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96 | }
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97 | usb_close(handle);
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98 | handle = NULL;
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99 | }
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100 | if(handle)
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101 | break;
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102 | }
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103 |
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104 | // At this point, either we have found a device and handle is pointing to it,
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105 | // or we failed and handle is NULL.
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106 | //
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107 | // TODO : use exceptions for error handling; instead of fprintf (not useable in GUI mode).
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108 | if (!handle)
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109 | std::cerr << "Could not find USB device \"" << product << "\" with vid=0x" << std::hex << vid << " pid=0x" << pid << std::endl;
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110 | }
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111 |
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112 |
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113 | Device::~Device()
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114 | {
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115 | usb_close(handle);
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116 | }
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117 |
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118 |
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119 | int Device::read(uint8_t* buffer, size_t max)
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120 | {
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121 | return usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, PSCMD_GET, 0,0, (char*)buffer, max, 5000);
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122 |
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123 | }
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124 |
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125 |
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126 | int Device::write(uint8_t* buffer, size_t size, int blktype)
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127 | {
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128 | int rqtype = (size == 0) ? USB_ENDPOINT_IN:USB_ENDPOINT_OUT;
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129 | return usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | rqtype, PSCMD_PUT, blktype,0 /*checksum*/, (char*)buffer, size, 5000);
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130 |
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131 | }
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132 |
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133 | uint8_t Device::getStatus()
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134 | {
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135 | uint8_t status;
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136 | usb_control_msg(handle, USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_ENDPOINT_IN, PSCMD_STATUS, 0,0, (char*)&status, 1, 5000);
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137 | // TODO handle errors (return value)
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138 | return status;
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139 | }
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