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linux: Better kernel version detection

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Refactor version detection into a function.
Handle versions of form X.Y.Z as well as X.Y.
Don't do workarounds for old kernels if version cannot be detected.
This commit is contained in:
Klee Dienes 2013-09-25 21:58:55 -04:00 committed by Alan Ott
parent 1a42177fa5
commit 3a66d4e513
1 changed files with 24 additions and 15 deletions
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39
linux/hid.c
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@ -80,6 +80,27 @@ struct hid_device_ {
static __u32 kernel_version = 0;
static __u32 detect_kernel_version(void)
{
struct utsname name;
int major, minor, release;
int ret;
uname(&name);
ret = sscanf(name.release, "%d.%d.%d", &major, &minor, &release);
if (ret == 3) {
return KERNEL_VERSION(major, minor, release);
}
ret = sscanf(name.release, "%d.%d", &major, &minor);
if (ret == 2) {
return KERNEL_VERSION(major, minor, 0);
}
printf("Couldn't determine kernel version from version string \"%s\"\n", name.release);
return 0;
}
static hid_device *new_hid_device(void)
{
hid_device *dev = calloc(1, sizeof(hid_device));
@ -345,6 +366,8 @@ int HID_API_EXPORT hid_init(void)
if (!locale)
setlocale(LC_CTYPE, "");
kernel_version = detect_kernel_version();
return 0;
}
@ -600,21 +623,6 @@ hid_device * HID_API_EXPORT hid_open_path(const char *path)
dev = new_hid_device();
if (kernel_version == 0) {
struct utsname name;
int major, minor, release;
int ret;
uname(&name);
ret = sscanf(name.release, "%d.%d.%d", &major, &minor, &release);
if (ret == 3) {
kernel_version = major << 16 | minor << 8 | release;
//printf("Kernel Version: %d\n", kernel_version);
}
else {
printf("Couldn't sscanf() version string %s\n", name.release);
}
}
/* OPEN HERE */
dev->device_handle = open(path, O_RDWR);
@ -700,6 +708,7 @@ int HID_API_EXPORT hid_read_timeout(hid_device *dev, unsigned char *data, size_t
bytes_read = 0;
if (bytes_read >= 0 &&
kernel_version != 0 &&
kernel_version < KERNEL_VERSION(2,6,34) &&
dev->uses_numbered_reports) {
/* Work around a kernel bug. Chop off the first byte. */