HID: remove initial reading of reports at connect

It looks like a bunch of devices do not like to be polled
for their reports at init time. When you look into the details,
it seems that for those that are requiring the quirk
HID_QUIRK_NO_INIT_REPORTS, the driver fails to retrieve part
of the features/inputs while others (more generic) work.

IMO, it should be acceptable to remove the need for the quirk
in the general case. On the small amount of cases where
we actually need to read the current values, the driver
in charge (hid-mt or wacom) already retrieves the features
manually.

There are 2 cases where we might need to retrieve the reports at
init:
1. hiddev devices with specific use-space tool
2. a device that would require the driver to fetch a specific
   feature/input at plug

For case 2, I have seen this a few time on hid-multitouch. It
is solved in hid-multitouch directly by fetching the feature.
I hope it won't be too common and this can be solved on a per-case
basis (crossing fingers).

For case 1, we moved the implementation of HID_QUIRK_NO_INIT_REPORTS
in hiddev. When somebody starts calling ioctls that needs an initial
update, the hiddev device will fetch the initial state of the reports
to mimic the current behavior. This adds a small amount of time during
the first HIDIOCGUSAGE(S), but it should be acceptable in
most cases. To keep the currently known broken devices, we have to
keep around HID_QUIRK_NO_INIT_REPORTS, but the scope will only be
for hiddev.

Note that I don't think hidraw would be affected and I checked that
the FF drivers that need to interact with the report fields are all
using output reports, which are not initialized by
usbhid_init_reports().

NO_INIT_INPUT_REPORTS is then replaced by HID_QUIRK_NO_INIT_REPORTS:
there is no point keeping it for just one device.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 0 insertions, 63 deletions

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index ea3c3546cef7..042b90d451ee 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -508,66 +508,6 @@ static int i2c_hid_get_report_length(struct hid_report *report)
                 report->device->report_enum[report->type].numbered + 2;
 }
 
-static void i2c_hid_init_report(struct hid_report *report, u8 *buffer,
-        size_t bufsize)
-{
-        struct hid_device *hid = report->device;
-        struct i2c_client *client = hid->driver_data;
-        struct i2c_hid *ihid = i2c_get_clientdata(client);
-        unsigned int size, ret_size;
-
-        size = i2c_hid_get_report_length(report);
-        if (i2c_hid_get_report(client,
-                        report->type == HID_FEATURE_REPORT ? 0x03 : 0x01,
-                        report->id, buffer, size))
-                return;
-
-        i2c_hid_dbg(ihid, "report (len=%d): %*ph\n", size, size, buffer);
-
-        ret_size = buffer[0] | (buffer[1] << 8);
-
-        if (ret_size != size) {
-                dev_err(&client->dev, "error in %s size:%d / ret_size:%d\n",
-                        __func__, size, ret_size);
-                return;
-        }
-
-        /* hid->driver_lock is held as we are in probe function,
-         * we just need to setup the input fields, so using
-         * hid_report_raw_event is safe. */
-        hid_report_raw_event(hid, report->type, buffer + 2, size - 2, 1);
-}
-
-/*
- * Initialize all reports
- */
-static void i2c_hid_init_reports(struct hid_device *hid)
-{
-        struct hid_report *report;
-        struct i2c_client *client = hid->driver_data;
-        struct i2c_hid *ihid = i2c_get_clientdata(client);
-        u8 *inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
-
-        if (!inbuf) {
-                dev_err(&client->dev, "can not retrieve initial reports\n");
-                return;
-        }
-
-        /*
-         * The device must be powered on while we fetch initial reports
-         * from it.
-         */
-        pm_runtime_get_sync(&client->dev);
-
-        list_for_each_entry(report,
-                &hid->report_enum[HID_FEATURE_REPORT].report_list, list)
-                i2c_hid_init_report(report, inbuf, ihid->bufsize);
-
-        pm_runtime_put(&client->dev);
-
-        kfree(inbuf);
-}
-
 /*
  * Traverse the supplied list of reports and find the longest
  */
@@ -789,9 +729,6 @@ static int i2c_hid_start(struct hid_device *hid)
                         return ret;
         }
 
-        if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
-                i2c_hid_init_reports(hid);
-
         return 0;
 }