device-driver

Im not really good at VC++ but does anyone have a sample code to get the rotation speed of disk in a computer. I have been working on detecting SSD drives and one solution from researching all day was to get the rotation speed and since SSD have 0 rpm this might be the only way to detect SSD drive. From google wmi ssd detect There is an NV cache manager interface used for ReadyDrive which is new to Vista. I think it is testing NV_FEATURE_PARAMETER's NVReadSpeed and NVWrtSpeed values. Windows 7 detects SSDs by using ATA8-ACS identify word 217: Nominal media rotation rate, with value 0001h as

I am designing a Linux character device driver. I want to set errno when error occurs in ioctl() system call. long my_own_ioctl(struct file *file, unsigned int req, unsigned long arg) { long ret = 0; BOOL isErr = FALSE; // some operation // ... if (isErr) { // set errno // ... <--- What should I do? ret = -1; } return ret; } What should I do to achieve that? Thank you at advance! Please allow me to explain my application with more detail. My device is located in /dev/myCharDev. My user space application is like this: #define _COMMAND (1) #define _ERROR_COMMAND_PARAMETER (-1) int main() { int

Note: I'm listing this problem as it is today, I'm not opposed to changing the implementation (moving the creation of the class to a common area for example) if it makes things easier... I'm just not sure how to do it. :End Note I've got two linux kernel modules and I'm trying to update the /sys entries for them. Searching around on google and other sources, I've seen lots of code along the lines of: static dev_t MyDev; static struct class *c1; static int __init start_func(void) { ... MyDev = MKDEV(nMajor, MINOR_VERSION); register_chrdev_region(MyDev, 1, MODULE_NAME); c1 = class_create(THIS

I've installed cyanogenmod on my galaxy 3. When developing in Eclipse, most apps seem to work okay. However, I've written an app that needs to access the gallery and every time I try to access it the app crashes with this at log cat: 02-03 19:05:42.054: D/libEGL(10279): loaded /system/lib/egl/libEGL_mali.so 02-03 19:05:42.059: D/libEGL(10279): loaded /system/lib/egl/libGLESv1_CM_mali.so 02-03 19:05:42.059: D/libEGL(10279): loaded /system/lib/egl/libGLESv2_mali.so 02-03 19:05:42.064: E/(10279): Device driver API match 02-03 19:05:42.064: E/(10279): Device driver API version: 23 02-03 19:05:42

When you need to access registers in the PCI configuration space, do you simply need to used built-in BIOS functions to read/write DWORDs into the configuration space? For example, if I am trying to use an IDE controller that is on B0:D31:F1 do I proceed to read/write the configuration register using that BDF as the parameters to the BIOS functions? So if I wanted to get the vendor id I would read the first DWORD in a given BDF? Or am I just way off base? EDIT: In the PCI BIOS specification, I have been looking over the definitions of the BIOS functions for reading and writing words into the

I'm developing a file system driver. I use free build Windows as a target machine. If I could get a checked build of Windows, I think I get more convenient. Isn't it. But I do not know even where I can get it. Does it need a cost? And what are the benefits I can get, when I use it. Checked builds are available to MSDN subscribers from the MSDN download website. The benefits are that when you attach a kernel debugger to debug your driver, you will gets lots of extra debugging information sent to the debug console, especially if you call any function with invalid parameters, it will be caught

I am trying to write a user-mode windows(XP, Vista & 7) virtual printer driver using WDK 7.1.0 . I plan to use eclipse IDE for development, so wanted to know if I can set it up for the same. I am looking to do following:- 1) Eclipse to recognize win32 apis (C and C++) and hence provide features like autocompletion for its function names 2) Eclipse to use compiler provided with WDK 3) Debug the code through eclipse (Not sure if this is possible or not) OR would you suggest some other development environment for windows driver development ? Definitely you should use MS Visual Studio with