[scotty1024]

*** USBTG_EBOOK4_20060801/usbtarget/dbmx1/dbmx1_usbtg.c   Fri May 12 23:48:50 2006
--- USBTG_EBOOK4_20061205/usbtarget/dbmx1/dbmx1_usbtg.c       Tue Dec  5 20:18:28 2006
***************
*** 3029,3035 ****
--- 3029,3038 ----
    switch (rqst) {
  
    case PM_RESUME:  /* USB ON */
+       //printk("PM RESUME\n");
+       /* PRS-500 device is not require this 2006.11.01
      if (dev->pm_status != USBTG_PM_ON) {
+       dev->pm_status = USBTG_PM_ON;
        if (usbtg_init_device() < 0) {
          ERROR("error - failed to initialize device!");
          return -1;
***************
*** 3044,3054 ****
        dev->pm_status = USBTG_PM_ON;
        INFO(1, "[PM] On");
      }
!     dragonball_gpio_set_bit(PORT_A, 20, 1); // test
      //printk("usb resume!\n");
      break;
  
    case PM_SUSPEND:
      usbtg_stop_monitor_vbus();
      if (dev->pm_status == USBTG_PM_ON) {
        usbtg_shutdown_device();
--- 3047,3063 ----
        dev->pm_status = USBTG_PM_ON;
        INFO(1, "[PM] On");
      }
!       */
!     //dragonball_gpio_set_bit(PORT_A, 20, 1); // test -> comment out 061101
      //printk("usb resume!\n");
      break;
  
    case PM_SUSPEND:
+       //printk("PM SUSPEND\n");
+       if( IS_VBUS_ACTIVE(dev->is_vbus) ) {
+         //printk("PM SUSPEND with vbus active!!\n");
+         return -1; // add 2006.12.05
+       }
      usbtg_stop_monitor_vbus();
      if (dev->pm_status == USBTG_PM_ON) {
        usbtg_shutdown_device();
***************
*** 3078,3084 ****
        break;
      }
      usbtg_suspend();
!     dragonball_gpio_set_bit(PORT_A, 20, 0); // test
      break;
  
  #ifdef CONFIG_SNSC
--- 3087,3093 ----
        break;
      }
      usbtg_suspend();
!     //dragonball_gpio_set_bit(PORT_A, 20, 0); // test -> comment out 061101
      break;
  
  #ifdef CONFIG_SNSC

THe USBTG code is the target driver that handles the USB port when the Portable Reader is communicating with a PC. The change is to optimize out code that isn't needed on the PRS (but was possibly needed on the LIbrie.)

Hopefully the proprietary software got some modifications as well.

I certainly appreciate Sony releasing the GPL source in *advance* of the firmware release, rather than months/years/never like some firms.