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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…
…/git/jikos/hid Pull HID updates from Jiri Kosina: - quirk for devices that need to be pulled in much more aggresive way than mandated, by Johan Hovold - robustification of sanity checking of incoming reports in RMI driver, by Benjamin Tissoires - fixes, updates, and new HW support to SONY driver, by Frank Praznik - port of uHID to the new transport layer layout, by David Herrmann - robustification of Clear-Halt/reset in USB HID, by Alan Stern - native support for hopefully any future HID compliant wacom tablet. Those found on the various laptops (ISDv4/5) already are HID compliant and they should work in the future without any modification of the kernel. Written by Benjamin Tissoires. - a lot more simple fixes and device ID additions all over the place * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (45 commits) HID: uHID: fix excepted report type HID: usbhid: add another mouse that needs QUIRK_ALWAYS_POLL HID: wacom: implement the finger part of the HID generic handling HID: wacom: implement generic HID handling for pen generic devices HID: wacom: move allocation of inputs earlier HID: wacom: split out input allocation and registration HID: wacom: rename failN with some meaningful information HID: sony: Update the DualShock 4 touchpad resolution HID: wacom: fix timeout on probe for some wacoms HID: sony: Set touchpad bits in the input_configured callback HID: sony: Update file header and correct comments HID: sony: Corrections for the DualShock 4 HID descriptor HID: rmi: check sanity of the incoming report HID: wacom: make the WL connection friendly for the desktop HID: wacom - enable LED support for Wireless Intuos5/Pro HID: wacom - remove report_id from wacom_get_report interface HID: wacom - Clean up of sysfs HID: wacom - Add default permission defines for sysfs attributes HID: usbhid: fix PIXART optical mouse HID: Add Holtek USB ID 04d9:a0c2 ETEKCITY Scroll ...
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,28 +1,13 @@ | ||
| UHID - User-space I/O driver support for HID subsystem | ||
| ======================================================== | ||
|
|
||
| The HID subsystem needs two kinds of drivers. In this document we call them: | ||
| UHID allows user-space to implement HID transport drivers. Please see | ||
| hid-transport.txt for an introduction into HID transport drivers. This document | ||
| relies heavily on the definitions declared there. | ||
|
|
||
| 1. The "HID I/O Driver" is the driver that performs raw data I/O to the | ||
| low-level device. Internally, they register an hid_ll_driver structure with | ||
| the HID core. They perform device setup, read raw data from the device and | ||
| push it into the HID subsystem and they provide a callback so the HID | ||
| subsystem can send data to the device. | ||
|
|
||
| 2. The "HID Device Driver" is the driver that parses HID reports and reacts on | ||
| them. There are generic drivers like "generic-usb" and "generic-bluetooth" | ||
| which adhere to the HID specification and provide the standardizes features. | ||
| But there may be special drivers and quirks for each non-standard device out | ||
| there. Internally, they use the hid_driver structure. | ||
|
|
||
| Historically, the USB stack was the first subsystem to provide an HID I/O | ||
| Driver. However, other standards like Bluetooth have adopted the HID specs and | ||
| may provide HID I/O Drivers, too. The UHID driver allows to implement HID I/O | ||
| Drivers in user-space and feed the data into the kernel HID-subsystem. | ||
|
|
||
| This allows user-space to operate on the same level as USB-HID, Bluetooth-HID | ||
| and similar. It does not provide a way to write HID Device Drivers, though. Use | ||
| hidraw for this purpose. | ||
| With UHID, a user-space transport driver can create kernel hid-devices for each | ||
| device connected to the user-space controlled bus. The UHID API defines the I/O | ||
| events provided from the kernel to user-space and vice versa. | ||
|
|
||
| There is an example user-space application in ./samples/uhid/uhid-example.c | ||
|
|
||
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|
@@ -42,8 +27,9 @@ by setting O_NONBLOCK. | |
| struct uhid_event { | ||
| __u32 type; | ||
| union { | ||
| struct uhid_create_req create; | ||
| struct uhid_data_req data; | ||
| struct uhid_create2_req create2; | ||
| struct uhid_output_req output; | ||
| struct uhid_input2_req input2; | ||
| ... | ||
| } u; | ||
| }; | ||
|
|
@@ -54,8 +40,11 @@ multiple write()'s. A single event must always be sent as a whole. Furthermore, | |
| only a single event can be sent per read() or write(). Pending data is ignored. | ||
| If you want to handle multiple events in a single syscall, then use vectored | ||
| I/O with readv()/writev(). | ||
| The "type" field defines the payload. For each type, there is a | ||
| payload-structure available in the union "u" (except for empty payloads). This | ||
| payload contains management and/or device data. | ||
|
|
||
| The first thing you should do is sending an UHID_CREATE event. This will | ||
| The first thing you should do is sending an UHID_CREATE2 event. This will | ||
| register the device. UHID will respond with an UHID_START event. You can now | ||
| start sending data to and reading data from UHID. However, unless UHID sends the | ||
| UHID_OPEN event, the internally attached HID Device Driver has no user attached. | ||
|
|
@@ -69,114 +58,130 @@ ref-counting for you. | |
| You may decide to ignore UHID_OPEN/UHID_CLOSE, though. I/O is allowed even | ||
| though the device may have no users. | ||
|
|
||
| If you want to send data to the HID subsystem, you send an HID_INPUT event with | ||
| your raw data payload. If the kernel wants to send data to the device, you will | ||
| read an UHID_OUTPUT or UHID_OUTPUT_EV event. | ||
| If you want to send data on the interrupt channel to the HID subsystem, you send | ||
| an HID_INPUT2 event with your raw data payload. If the kernel wants to send data | ||
| on the interrupt channel to the device, you will read an UHID_OUTPUT event. | ||
| Data requests on the control channel are currently limited to GET_REPORT and | ||
| SET_REPORT (no other data reports on the control channel are defined so far). | ||
| Those requests are always synchronous. That means, the kernel sends | ||
| UHID_GET_REPORT and UHID_SET_REPORT events and requires you to forward them to | ||
| the device on the control channel. Once the device responds, you must forward | ||
| the response via UHID_GET_REPORT_REPLY and UHID_SET_REPORT_REPLY to the kernel. | ||
| The kernel blocks internal driver-execution during such round-trips (times out | ||
| after a hard-coded period). | ||
|
|
||
| If your device disconnects, you should send an UHID_DESTROY event. This will | ||
| unregister the device. You can now send UHID_CREATE again to register a new | ||
| unregister the device. You can now send UHID_CREATE2 again to register a new | ||
| device. | ||
| If you close() the fd, the device is automatically unregistered and destroyed | ||
| internally. | ||
|
|
||
| write() | ||
| ------- | ||
| write() allows you to modify the state of the device and feed input data into | ||
| the kernel. The following types are supported: UHID_CREATE, UHID_DESTROY and | ||
| UHID_INPUT. The kernel will parse the event immediately and if the event ID is | ||
| the kernel. The kernel will parse the event immediately and if the event ID is | ||
| not supported, it will return -EOPNOTSUPP. If the payload is invalid, then | ||
| -EINVAL is returned, otherwise, the amount of data that was read is returned and | ||
| the request was handled successfully. | ||
| the request was handled successfully. O_NONBLOCK does not affect write() as | ||
| writes are always handled immediately in a non-blocking fashion. Future requests | ||
| might make use of O_NONBLOCK, though. | ||
|
|
||
| UHID_CREATE: | ||
| UHID_CREATE2: | ||
| This creates the internal HID device. No I/O is possible until you send this | ||
| event to the kernel. The payload is of type struct uhid_create_req and | ||
| event to the kernel. The payload is of type struct uhid_create2_req and | ||
| contains information about your device. You can start I/O now. | ||
|
|
||
| UHID_CREATE2: | ||
| Same as UHID_CREATE, but the HID report descriptor data (rd_data) is an array | ||
| inside struct uhid_create2_req, instead of a pointer to a separate array. | ||
| Enables use from languages that don't support pointers, e.g. Python. | ||
|
|
||
| UHID_DESTROY: | ||
| This destroys the internal HID device. No further I/O will be accepted. There | ||
| may still be pending messages that you can receive with read() but no further | ||
| UHID_INPUT events can be sent to the kernel. | ||
| You can create a new device by sending UHID_CREATE again. There is no need to | ||
| You can create a new device by sending UHID_CREATE2 again. There is no need to | ||
| reopen the character device. | ||
|
|
||
| UHID_INPUT: | ||
| You must send UHID_CREATE before sending input to the kernel! This event | ||
| contains a data-payload. This is the raw data that you read from your device. | ||
| The kernel will parse the HID reports and react on it. | ||
|
|
||
| UHID_INPUT2: | ||
| Same as UHID_INPUT, but the data array is the last field of uhid_input2_req. | ||
| Enables userspace to write only the required bytes to kernel (ev.type + | ||
| ev.u.input2.size + the part of the data array that matters), instead of | ||
| the entire struct uhid_input2_req. | ||
|
|
||
| UHID_FEATURE_ANSWER: | ||
| If you receive a UHID_FEATURE request you must answer with this request. You | ||
| must copy the "id" field from the request into the answer. Set the "err" field | ||
| to 0 if no error occurred or to EIO if an I/O error occurred. | ||
| You must send UHID_CREATE2 before sending input to the kernel! This event | ||
| contains a data-payload. This is the raw data that you read from your device | ||
| on the interrupt channel. The kernel will parse the HID reports. | ||
|
|
||
| UHID_GET_REPORT_REPLY: | ||
| If you receive a UHID_GET_REPORT request you must answer with this request. | ||
| You must copy the "id" field from the request into the answer. Set the "err" | ||
| field to 0 if no error occurred or to EIO if an I/O error occurred. | ||
| If "err" is 0 then you should fill the buffer of the answer with the results | ||
| of the feature request and set "size" correspondingly. | ||
| of the GET_REPORT request and set "size" correspondingly. | ||
|
|
||
| UHID_SET_REPORT_REPLY: | ||
| This is the SET_REPORT equivalent of UHID_GET_REPORT_REPLY. Unlike GET_REPORT, | ||
| SET_REPORT never returns a data buffer, therefore, it's sufficient to set the | ||
| "id" and "err" fields correctly. | ||
|
|
||
| read() | ||
| ------ | ||
| read() will return a queued output report. These output reports can be of type | ||
| UHID_START, UHID_STOP, UHID_OPEN, UHID_CLOSE, UHID_OUTPUT or UHID_OUTPUT_EV. No | ||
| reaction is required to any of them but you should handle them according to your | ||
| needs. Only UHID_OUTPUT and UHID_OUTPUT_EV have payloads. | ||
| read() will return a queued output report. No reaction is required to any of | ||
| them but you should handle them according to your needs. | ||
|
|
||
| UHID_START: | ||
| This is sent when the HID device is started. Consider this as an answer to | ||
| UHID_CREATE. This is always the first event that is sent. | ||
| UHID_CREATE2. This is always the first event that is sent. Note that this | ||
| event might not be available immediately after write(UHID_CREATE2) returns. | ||
| Device drivers might required delayed setups. | ||
| This event contains a payload of type uhid_start_req. The "dev_flags" field | ||
| describes special behaviors of a device. The following flags are defined: | ||
| UHID_DEV_NUMBERED_FEATURE_REPORTS: | ||
| UHID_DEV_NUMBERED_OUTPUT_REPORTS: | ||
| UHID_DEV_NUMBERED_INPUT_REPORTS: | ||
| Each of these flags defines whether a given report-type uses numbered | ||
| reports. If numbered reports are used for a type, all messages from | ||
| the kernel already have the report-number as prefix. Otherwise, no | ||
| prefix is added by the kernel. | ||
| For messages sent by user-space to the kernel, you must adjust the | ||
| prefixes according to these flags. | ||
|
|
||
| UHID_STOP: | ||
| This is sent when the HID device is stopped. Consider this as an answer to | ||
| UHID_DESTROY. | ||
| If the kernel HID device driver closes the device manually (that is, you | ||
| didn't send UHID_DESTROY) then you should consider this device closed and send | ||
| an UHID_DESTROY event. You may want to reregister your device, though. This is | ||
| always the last message that is sent to you unless you reopen the device with | ||
| UHID_CREATE. | ||
| If you didn't destroy your device via UHID_DESTROY, but the kernel sends an | ||
| UHID_STOP event, this should usually be ignored. It means that the kernel | ||
| reloaded/changed the device driver loaded on your HID device (or some other | ||
| maintenance actions happened). | ||
| You can usually ignored any UHID_STOP events safely. | ||
|
|
||
| UHID_OPEN: | ||
| This is sent when the HID device is opened. That is, the data that the HID | ||
| device provides is read by some other process. You may ignore this event but | ||
| it is useful for power-management. As long as you haven't received this event | ||
| there is actually no other process that reads your data so there is no need to | ||
| send UHID_INPUT events to the kernel. | ||
| send UHID_INPUT2 events to the kernel. | ||
|
|
||
| UHID_CLOSE: | ||
| This is sent when there are no more processes which read the HID data. It is | ||
| the counterpart of UHID_OPEN and you may as well ignore this event. | ||
|
|
||
| UHID_OUTPUT: | ||
| This is sent if the HID device driver wants to send raw data to the I/O | ||
| device. You should read the payload and forward it to the device. The payload | ||
| is of type "struct uhid_data_req". | ||
| device on the interrupt channel. You should read the payload and forward it to | ||
| the device. The payload is of type "struct uhid_data_req". | ||
| This may be received even though you haven't received UHID_OPEN, yet. | ||
|
|
||
| UHID_OUTPUT_EV (obsolete): | ||
| Same as UHID_OUTPUT but this contains a "struct input_event" as payload. This | ||
| is called for force-feedback, LED or similar events which are received through | ||
| an input device by the HID subsystem. You should convert this into raw reports | ||
| and send them to your device similar to events of type UHID_OUTPUT. | ||
| This is no longer sent by newer kernels. Instead, HID core converts it into a | ||
| raw output report and sends it via UHID_OUTPUT. | ||
|
|
||
| UHID_FEATURE: | ||
| This event is sent if the kernel driver wants to perform a feature request as | ||
| described in the HID specs. The report-type and report-number are available in | ||
| the payload. | ||
| The kernel serializes feature requests so there will never be two in parallel. | ||
| However, if you fail to respond with a UHID_FEATURE_ANSWER in a time-span of 5 | ||
| seconds, then the requests will be dropped and a new one might be sent. | ||
| Therefore, the payload also contains an "id" field that identifies every | ||
| request. | ||
|
|
||
| Document by: | ||
| David Herrmann <[email protected]> | ||
| UHID_GET_REPORT: | ||
| This event is sent if the kernel driver wants to perform a GET_REPORT request | ||
| on the control channeld as described in the HID specs. The report-type and | ||
| report-number are available in the payload. | ||
| The kernel serializes GET_REPORT requests so there will never be two in | ||
| parallel. However, if you fail to respond with a UHID_GET_REPORT_REPLY, the | ||
| request might silently time out. | ||
| Once you read a GET_REPORT request, you shall forward it to the hid device and | ||
| remember the "id" field in the payload. Once your hid device responds to the | ||
| GET_REPORT (or if it fails), you must send a UHID_GET_REPORT_REPLY to the | ||
| kernel with the exact same "id" as in the request. If the request already | ||
| timed out, the kernel will ignore the response silently. The "id" field is | ||
| never re-used, so conflicts cannot happen. | ||
|
|
||
| UHID_SET_REPORT: | ||
| This is the SET_REPORT equivalent of UHID_GET_REPORT. On receipt, you shall | ||
| send a SET_REPORT request to your hid device. Once it replies, you must tell | ||
| the kernel about it via UHID_SET_REPORT_REPLY. | ||
| The same restrictions as for UHID_GET_REPORT apply. | ||
|
|
||
| ---------------------------------------------------- | ||
| Written 2012, David Herrmann <[email protected]> | ||
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