HID: make .raw_request mandatory

SET_REPORT and GET_REPORT are mandatory in the HID specification.
Make the corresponding API in hid-core mandatory too, which removes the
need to test against it in some various places.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/Documentation/hid/hid-transport.txt b/Documentation/hid/hid-transport.txt
index 9dbbcea..3dcba9f 100644 (file)
--- a/Documentation/hid/hid-transport.txt
+++ b/Documentation/hid/hid-transport.txt
@@ -283,7 +283,8 @@ The available HID callbacks are:
                        int reqtype)
    Same as ->request() but provides the report as raw buffer. This request shall
    be synchronous. A transport driver must not use ->wait() to complete such
-   requests.
+   requests. This request is mandatory and hid core will reject the device if
+   it is missing.
 
  - int (*output_report) (struct hid_device *hdev, __u8 *buf, size_t len)
    Send raw output report via intr channel. Used by some HID device drivers

diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index b6ae697..0b57bab 100644 (file)
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1330,9 +1330,6 @@ void __hid_request(struct hid_device *hid, struct hid_report *report,
        int ret;
        int len;
 
-       if (!hid->ll_driver->raw_request)
-               return;
-
        buf = hid_alloc_report_buf(report, GFP_KERNEL);
        if (!buf)
                return;
@@ -2471,6 +2468,14 @@ int hid_add_device(struct hid_device *hdev)
        if (hid_ignore(hdev))
                return -ENODEV;
 
+       /*
+        * Check for the mandatory transport channel.
+        */
+        if (!hdev->ll_driver->raw_request) {
+               hid_err(hdev, "transport driver missing .raw_request()\n");
+               return -EINVAL;
+        }
+
        /*
         * Read the device report descriptor once and use as template
         * for the driver-specific modifications.

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 310b967..f5aef79 100644 (file)
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -1266,9 +1266,7 @@ static struct hid_input *hidinput_allocate(struct hid_device *hid)
        }
 
        input_set_drvdata(input_dev, hid);
-       if (hid->ll_driver->request || hid->ll_driver->output_report ||
-           hid->ll_driver->raw_request)
-               input_dev->event = hidinput_input_event;
+       input_dev->event = hidinput_input_event;
        input_dev->open = hidinput_open;
        input_dev->close = hidinput_close;
        input_dev->setkeycode = hidinput_setkeycode;

diff --git a/include/linux/hid.h b/include/linux/hid.h
index 60f3ff7..5eb282e 100644 (file)
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -992,11 +992,8 @@ static inline int hid_hw_raw_request(struct hid_device *hdev,
        if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
                return -EINVAL;
 
-       if (hdev->ll_driver->raw_request)
-               return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
+       return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
                                                    rtype, reqtype);
-
-       return -ENOSYS;
 }
 
 /**