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HID: core: Add functions for HID drivers to react on first open and last close call

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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>
Link: https://patch.msgid.link/20250211133950.422232-1-wse@tuxedocomputers.com
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Werner Sembach 2025-02-11 14:39:05 +01:00 committed by Benjamin Tissoires
parent a058002358
commit a98e892c69
2 changed files with 12 additions and 1 deletions
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9
drivers/hid/hid-core.c
View File

@ -2396,6 +2396,9 @@ 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);
@ -2415,8 +2418,12 @@ 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);

4
include/linux/hid.h
View File

@ -795,6 +795,8 @@ 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
@ -850,6 +852,8 @@ 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;