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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2017-03-08 15:11:14 +0100
committerJiri Kosina <jkosina@suse.cz>2017-03-21 14:59:56 +0100
commit9143059fafd4eebed2d43ffb5455178d4010e60a (patch)
tree58710b0bd2717dea4c871740bcd95c436ae53db0 /drivers/hid/i2c-hid
parent81bbef23db51c0b450d90607fbbc2ad80ee0d43f (diff)
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>
Diffstat (limited to 'drivers/hid/i2c-hid')
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c63
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;
}