// HDX reads data in Half Duplex mode
// first we energise the TAG for long enough that it charges up
// then we use sniffer to read response
// each bit is 16 ticks, a 1 is 124.2 KHz and a 0 is 134.2 KHz
// activation frequency is 134.2 KHz (745 FCs))
BOOL hdx_get_uid(BYTE *response)
{
BYTE i;
BYTE tmp[HDX_DATABITS];
// this is a work in progress, so until reading produces any data, return empty
return FALSE;
// energise tag & wait for wakeup period
InitHWReaderClock(OC_TOGGLE_PULSE, 745 / 2L, 745, RWD_STATE_ACTIVE);
Delay_us((RFIDlerConfig.FrameClock * RFIDlerConfig.RWD_Wake_Period) / 100);
// switch off clock and switch to sniffer mode
detect_init();
// read to temporary array for speed
for(i= 0 ; i < HDX_DATABITS ; ++i)
tmp[i]= read_external_clock_burst(16) / 1000L;
// convert to binary based on freq +- 3
for(i= 0 ; i < HDX_DATABITS ; ++i)
{
if (tmp[i] >= 122 && tmp[i] <= 128)
tmp[i]= 0x01;
else
if (tmp[i] >= 129 && tmp[i] <= 135)
tmp[i]= 0x00;
else
return FALSE;
}
binarraytohex(response, tmp, HDX_DATABITS);
return TRUE;
}
void stride_init(void)
{
#ifdef APE
detect_init();
#else
decoder_init();
#endif
}
void decoder_init(void)
{
detect_init();
}
static int camera_detect_probe(struct platform_device *pdev)
{
int ret = 0;
const char *detect_status = NULL;
struct device_node *fdt_node;
DBG_INFO("");
fdt_node = of_find_compatible_node(NULL, NULL, CAMERA_DETECT_NAME);
if (NULL == fdt_node) {
DBG_ERR("err: no ["CAMERA_DETECT_NAME"] in dts");
return -1;
}
ret = of_property_read_string(fdt_node, "status", &detect_status);
if (ret == 0 && strcmp(detect_status, "okay") != 0) {
printk(KERN_DEBUG"%s camera detect disabled by DTS in %s\n",__func__,fdt_node->full_name);
return -ENODEV;
}
ret = detect_init();
if (ret) {
DBG_ERR("module detect init error.");
goto exit;
}
rear_kobj = kobject_create_and_add(CAMERA_REAR_NAME, NULL);
if (rear_kobj == NULL) {
DBG_ERR("kobject_create_and_add failed.");
ret = -ENOMEM;
goto kobject_create_err;
}
front_kobj = kobject_create_and_add(CAMERA_FRONT_NAME, NULL);
if (front_kobj == NULL) {
DBG_ERR("kobject_create_and_add failed.");
ret = -ENOMEM;
goto kobject_create_err;
}
ret = sysfs_create_file(front_kobj, &dev_attr_front_name.attr);
if (ret < 0){
DBG_ERR("sysfs_create_file front_name failed.");
goto sysfs_create_err;
}
ret = sysfs_create_file(front_kobj, &dev_attr_front_offset.attr);
if (ret < 0){
DBG_ERR("sysfs_create_file front_offset failed.");
goto sysfs_create_err;
}
ret = sysfs_create_file(rear_kobj, &dev_attr_rear_name.attr);
if (ret < 0){
DBG_ERR("sysfs_create_file rear_name failed.");
goto sysfs_create_err;
}
ret = sysfs_create_file(rear_kobj, &dev_attr_rear_offset.attr);
if (ret < 0){
DBG_ERR("sysfs_create_file rear_offset failed.");
goto sysfs_create_err;
}
ret = sysfs_create_file(rear_kobj, &dev_attr_status.attr);
if (ret < 0){
DBG_ERR("sysfs_create_file status failed.");
goto sysfs_create_err;
}
camera_detect_status = 0;
INIT_DELAYED_WORK(&g_work, detect_work);
schedule_delayed_work(&g_work, DELAY_INTERVAL);
return 0;
sysfs_create_err:
kobject_del(rear_kobj);
kobject_del(front_kobj);
kobject_create_err:
exit:
detect_deinit();
return ret;
}
