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Support for getting USB strings (Manufacturer, Product, Serial) from

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the device during runtime (as opposed to enumerate-time).
This commit is contained in:
Alan Ott
2010-07-07 23:48:29 -04:00
parent ca717d8553
commit d2489f8755
1 changed files with 83 additions and 12 deletions
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linux/hid.c
+83 -12
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@@ -133,6 +133,53 @@ static int uses_numbered_reports(__u8 *report_descriptor, __u32 size) {
return 0;
}
static int get_device_string(struct Device *dev, const char *key, wchar_t *string, size_t maxlen)
{
struct udev *udev;
struct udev_device *udev_dev, *parent;
struct stat s;
int ret = -1;
setlocale(LC_ALL,"");
/* Create the udev object */
udev = udev_new();
if (!udev) {
printf("Can't create udev\n");
return -1;
}
/* Get the dev_t (major/minor numbers) from the file handle. */
fstat(dev->device_handle, &s);
/* Open a udev device from the dev_t. 'c' means character device. */
udev_dev = udev_device_new_from_devnum(udev, 'c', s.st_rdev);
if (udev_dev) {
const char *str;
/* Find the parent USB Device */
parent = udev_device_get_parent_with_subsystem_devtype(
udev_dev,
"usb",
"usb_device");
if (parent) {
str = udev_device_get_sysattr_value(parent, key);
if (str) {
/* Convert the string from UTF-8 to wchar_t */
ret = mbstowcs(string, str, maxlen);
goto end;
}
}
}
end:
udev_device_unref(parent);
// udev_dev doesn't need unref'd. Not sure why, but
// it'll throw "double free" errors.
udev_unref(udev);
return ret;
}
struct hid_device HID_API_EXPORT *hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
struct udev *udev;
@@ -354,7 +401,7 @@ int HID_API_EXPORT hid_open_path(const char *path)
if (dev->device_handle > 0) {
/* Get the report descriptor */
int i, res, desc_size = 0;
int res, desc_size = 0;
struct hidraw_report_descriptor rpt_desc;
memset(&rpt_desc, 0x0, sizeof(rpt_desc));
@@ -465,6 +512,36 @@ int HID_API_EXPORT hid_set_nonblocking(int device, int nonblock)
}
}
int HID_API_EXPORT hid_send_feature_report(int device, const unsigned char *data, size_t length)
{
struct Device *dev = NULL;
// Get the handle
if (device < 0 || device >= MAX_DEVICES)
return -1;
if (devices[device].valid == 0)
return -1;
dev = &devices[device];
return -1;
}
int HID_API_EXPORT hid_get_feature_report(int device, unsigned char *data, size_t length)
{
struct Device *dev = NULL;
// Get the handle
if (device < 0 || device >= MAX_DEVICES)
return -1;
if (devices[device].valid == 0)
return -1;
dev = &devices[device];
return -1;
}
void HID_API_EXPORT hid_close(int device)
{
struct Device *dev = NULL;
@@ -481,10 +558,10 @@ void HID_API_EXPORT hid_close(int device)
dev->valid = 0;
}
int HID_API_EXPORT_CALL hid_get_manufacturer_string(int device, wchar_t *string, size_t maxlen)
{
struct Device *dev = NULL;
int res;
// Get the handle
if (device < 0 || device >= MAX_DEVICES)
@@ -493,15 +570,12 @@ int HID_API_EXPORT_CALL hid_get_manufacturer_string(int device, wchar_t *string,
return -1;
dev = &devices[device];
// TODO:
return 0;
return get_device_string(dev, "manufacturer", string, maxlen);
}
int HID_API_EXPORT_CALL hid_get_product_string(int device, wchar_t *string, size_t maxlen)
{
struct Device *dev = NULL;
int res;
// Get the handle
if (device < 0 || device >= MAX_DEVICES)
@@ -510,15 +584,13 @@ int HID_API_EXPORT_CALL hid_get_product_string(int device, wchar_t *string, size
return -1;
dev = &devices[device];
// TODO:
return get_device_string(dev, "product", string, maxlen);
return 0;
}
int HID_API_EXPORT_CALL hid_get_serial_number_string(int device, wchar_t *string, size_t maxlen)
{
struct Device *dev = NULL;
int res;
// Get the handle
if (device < 0 || device >= MAX_DEVICES)
@@ -527,7 +599,7 @@ int HID_API_EXPORT_CALL hid_get_serial_number_string(int device, wchar_t *string
return -1;
dev = &devices[device];
// TODO:
return get_device_string(dev, "serial", string, maxlen);
return 0;
}
@@ -535,7 +607,6 @@ int HID_API_EXPORT_CALL hid_get_serial_number_string(int device, wchar_t *string
int HID_API_EXPORT_CALL hid_get_indexed_string(int device, int string_index, wchar_t *string, size_t maxlen)
{
struct Device *dev = NULL;
int res;
// Get the handle
if (device < 0 || device >= MAX_DEVICES)
@@ -546,7 +617,7 @@ int HID_API_EXPORT_CALL hid_get_indexed_string(int device, int string_index, wch
// TODO:
return 0;
return -1;
}