diff options
| author | Werner Sembach <wse@tuxedocomputers.com> | 2025-02-11 16:39:05 +0300 |
|---|---|---|
| committer | Benjamin Tissoires <bentiss@kernel.org> | 2025-05-13 16:59:03 +0300 |
| commit | a98e892c694284256296465a78d11072e2c5419f (patch) | |
| tree | 4cb41198bdac5684f34eee1140bed9219378c4e8 | |
| parent | a058002358b7aaf14674b2a0daa5194bfa5720a1 (diff) | |
| download | linux-a98e892c694284256296465a78d11072e2c5419f.tar.xz | |
HID: core: Add functions for HID drivers to react on first open and last close call
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>
| -rw-r--r-- | drivers/hid/hid-core.c | 9 | ||||
| -rw-r--r-- | include/linux/hid.h | 4 |
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 4741ff626771..b348d0464314 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -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); diff --git a/include/linux/hid.h b/include/linux/hid.h index a1305210b2fd..568a9d8c749b 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -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; |