@@ -2392,6 +2392,9 @@ int hid_hw_open(struct hid_device *hdev)
ret = hdev->ll_driver->open(hdev);
if (ret)
hdev->ll_open_count--;
+
+ if (hdev->driver->on_hid_hw_open)
+ hdev->driver->on_hid_hw_open(hdev);
}
mutex_unlock(&hdev->ll_open_lock);
@@ -2411,8 +2414,12 @@ EXPORT_SYMBOL_GPL(hid_hw_open);
void hid_hw_close(struct hid_device *hdev)
{
mutex_lock(&hdev->ll_open_lock);
- if (!--hdev->ll_open_count)
+ if (!--hdev->ll_open_count) {
hdev->ll_driver->close(hdev);
+
+ if (hdev->driver->on_hid_hw_close)
+ hdev->driver->on_hid_hw_close(hdev);
+ }
mutex_unlock(&hdev->ll_open_lock);
}
EXPORT_SYMBOL_GPL(hid_hw_close);
@@ -790,6 +790,8 @@ struct hid_usage_id {
* @suspend: invoked on suspend (NULL means nop)
* @resume: invoked on resume if device was not reset (NULL means nop)
* @reset_resume: invoked on resume if device was reset (NULL means nop)
+ * @on_hid_hw_open: invoked when hid core opens first instance (NULL means nop)
+ * @on_hid_hw_close: invoked when hid core closes last instance (NULL means nop)
*
* probe should return -errno on error, or 0 on success. During probe,
* input will not be passed to raw_event unless hid_device_io_start is
@@ -845,6 +847,8 @@ struct hid_driver {
int (*suspend)(struct hid_device *hdev, pm_message_t message);
int (*resume)(struct hid_device *hdev);
int (*reset_resume)(struct hid_device *hdev);
+ void (*on_hid_hw_open)(struct hid_device *hdev);
+ void (*on_hid_hw_close)(struct hid_device *hdev);
/* private: */
struct device_driver driver;
Adds a new function to the hid_driver struct that is called when the userspace starts using the device, and another one that is called when userspace stop using the device. With this a hid driver can implement special suspend handling for devices currently not in use. Signed-off-by: Werner Sembach <wse@tuxedocomputers.com> --- drivers/hid/hid-core.c | 9 ++++++++- include/linux/hid.h | 4 ++++ 2 files changed, 12 insertions(+), 1 deletion(-)