device-driver

I have written a device driver kext for a hot-plug SCSI device, based somewhat on Wagerlabs code (using a driver-user client-application model) and everything works. The only remaining concern is that the driver appears not to be consistently freed, especially if the application crashes. For example, when I try to unload the kext, even with the device disconnected and the application closed, there are still outstanding instances of the driver and user client (with the driver generally outnumbering the user client). I have logging in the driver functions like free() , and when I shut down the

How can I get a list of all the active kernel drivers on my Android system?. What is the equivelant of Linux "lsmod" in Android? I used adb shell and also opened my Android Terminal emulator app and did an "lsmod". I get some kind of a lame list of two items from my BSP. But it doesn't list all the drivers on my entire system that the Linux kernel has actively running. Doing an 'ls /sys/module/' on my Samsung Galaxy S3 running 4.1.1 Jelly bean, I get the following output http://pastebin.com/2zF8RwvS That is a list of all the built-in modules in my Kernel 3.0.31 Additionally, there are loadable

I am receiving iPhone device token in the form of NSData object. When I tested my notifications script function, I have only copied that object from log and the notifications went fine. However when I try now to automatically do it, I am sending the device token as ASCII encoded string in the form of variable self.deviceToken = [[NSString alloc] initWithData:webDeviceToken encoding:NSASCIIStringEncoding]; The string that I am getting has some funky characters and looks similar to this "å-0¾fZÿ÷ʺÎUQüRáqEªfÔk«" When server side script sends the notification to that token, I am not receiving

I am implementing an SPI driver for an accelerometer. The SPI part is done but I can't read values from userspace. static char charDevMessage[CD_BUFFER_SIZE] = { 0 }; ... static ssize_t char_dev_read(struct file *filep, char *buffer, size_t len, loff_t *position) { int error_count = 0; struct xyz_values xyz; size_t size_requested; xyz = adxl345_get_xyz(); memset(charDevMessage, 0, CD_BUFFER_SIZE); sprintf(charDevMessage, "%d,%d,%d", xyz.x, xyz.y, xyz.z); printk(KERN_INFO "MOB: %s, requested size: %d\n", charDevMessage, len); if (len >= CD_BUFFER_SIZE) { size_requested = CD_BUFFER_SIZE; } else

I have a Serial-to-USB device with a similarly named device driver in the Windows device manager. The devices do not always grab the same COM port on system boot, so my program needs to identify it on start up. I've tried using RXTX to enumerate the COM ports on the system, but this didn't work because CommPortIdentifier.getName() simply returns the COM name (eg. COM1, COM2, etc.) I need to acquire either the driver manufacturer name, or the driver name as it appears in the device manager, and associate it with the COM name. Can this easily be done in Java? (I'd be interested in any 3rd party

Why do many people say I/O completion port is fast and nice model? What is the I/O completion port's advantages and disadvantages? I want to know some points which make faster IOCP than other model. If you can explain it comparing other models(select, epoll, traditional multi thread/process), it would be better. Damon I/O completion ports are awesome. There's no better word to describe them. If anything in Windows was done right, it's completion ports. You can create some number of threads (does not really matter how many) and make them all block on one completion port until an event (either