* Generic USB LED HID driver @ 2024-01-19 10:21 Kirill Yatsenko 2024-01-19 11:17 ` Greg KH 0 siblings, 1 reply; 5+ messages in thread From: Kirill Yatsenko @ 2024-01-19 10:21 UTC (permalink / raw) To: kernelnewbies [-- Attachment #1.1: Type: text/plain, Size: 639 bytes --] Hello, I'm trying to find the Linux kernel driver in the tree that implements the HID LED usage table. The only driver that I've found is the hid-led.c. However, it seems to support only specific devices. The device with which I'm trying to interface is the custom-made board with atxmega and some LEDS connected to it. Currently, the communication is done through the vendor-specific HID protocol. The custom USB HID kernel module is implemented to communicate with the device. The idea is to move away from the custom protocol to the generic implementation so that the custom kernel module can dropped. Best regards, Kirill Yatsenko [-- Attachment #1.2: Type: text/html, Size: 825 bytes --] [-- Attachment #2: Type: text/plain, Size: 170 bytes --] _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Generic USB LED HID driver 2024-01-19 10:21 Generic USB LED HID driver Kirill Yatsenko @ 2024-01-19 11:17 ` Greg KH 2024-01-19 11:45 ` Kirill Yatsenko 0 siblings, 1 reply; 5+ messages in thread From: Greg KH @ 2024-01-19 11:17 UTC (permalink / raw) To: Kirill Yatsenko; +Cc: kernelnewbies On Fri, Jan 19, 2024 at 11:21:51AM +0100, Kirill Yatsenko wrote: > Hello, > > I'm trying to find the Linux kernel driver in the tree that implements the > HID LED usage table. > The only driver that I've found is the hid-led.c. However, it seems to > support only specific devices. > > The device with which I'm trying to interface is the custom-made board with > atxmega and some LEDS connected to it. > Currently, the communication is done through the vendor-specific HID > protocol. > The custom USB HID kernel module is implemented to communicate with the > device. Why not do this from userspace using libusb or the generic hid userspace api? Why do you need a kernel driver? thanks, greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Generic USB LED HID driver 2024-01-19 11:17 ` Greg KH @ 2024-01-19 11:45 ` Kirill Yatsenko 2024-01-19 12:07 ` Greg KH 0 siblings, 1 reply; 5+ messages in thread From: Kirill Yatsenko @ 2024-01-19 11:45 UTC (permalink / raw) To: Greg KH; +Cc: kernelnewbies [-- Attachment #1.1: Type: text/plain, Size: 1214 bytes --] Hello Greg, Thanks for the suggestions! Yes, it will be better to implement the communication from the userspace. However, I was curious if the kernel implements some generic LED HID interface already, without the need to write custom code. Similarly, as it's done for example for the HID multitouch, where the device only needs to report the correct report descriptor. Best regards, Kirill Yatsenko On Fri, 19 Jan 2024 at 12:17, Greg KH <greg@kroah.com> wrote: > On Fri, Jan 19, 2024 at 11:21:51AM +0100, Kirill Yatsenko wrote: > > Hello, > > > > I'm trying to find the Linux kernel driver in the tree that implements > the > > HID LED usage table. > > The only driver that I've found is the hid-led.c. However, it seems to > > support only specific devices. > > > > The device with which I'm trying to interface is the custom-made board > with > > atxmega and some LEDS connected to it. > > Currently, the communication is done through the vendor-specific HID > > protocol. > > The custom USB HID kernel module is implemented to communicate with the > > device. > > Why not do this from userspace using libusb or the generic hid userspace > api? Why do you need a kernel driver? > > thanks, > > greg k-h > [-- Attachment #1.2: Type: text/html, Size: 1728 bytes --] [-- Attachment #2: Type: text/plain, Size: 170 bytes --] _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Generic USB LED HID driver 2024-01-19 11:45 ` Kirill Yatsenko @ 2024-01-19 12:07 ` Greg KH 2024-01-19 12:40 ` Kirill Yatsenko 0 siblings, 1 reply; 5+ messages in thread From: Greg KH @ 2024-01-19 12:07 UTC (permalink / raw) To: Kirill Yatsenko; +Cc: kernelnewbies On Fri, Jan 19, 2024 at 12:45:52PM +0100, Kirill Yatsenko wrote: > Hello Greg, > > Thanks for the suggestions! > Yes, it will be better to implement the communication from the userspace. > > However, I was curious if the kernel implements some generic LED HID > interface already, > without the need to write custom code. Similarly, as it's done for example > for the HID multitouch, > where the device only needs to report the correct report descriptor. I do not think there is a generic HID description yet, is there? If so, the kernel should support it, otherwise it is all vendor-specific stuff that belongs in userspace. thanks, greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Generic USB LED HID driver 2024-01-19 12:07 ` Greg KH @ 2024-01-19 12:40 ` Kirill Yatsenko 0 siblings, 0 replies; 5+ messages in thread From: Kirill Yatsenko @ 2024-01-19 12:40 UTC (permalink / raw) To: Greg KH; +Cc: kernelnewbies [-- Attachment #1.1: Type: text/plain, Size: 1552 bytes --] > > Hello Greg, > > > > Thanks for the suggestions! > > Yes, it will be better to implement the communication from the userspace. > > > > However, I was curious if the kernel implements some generic LED HID > > interface already, > > without the need to write custom code. Similarly, as it's done for example > > for the HID multitouch, > > where the device only needs to report the correct report descriptor. > I do not think there is a generic HID description yet, is there? If so, > the kernel should support it, otherwise it is all vendor-specific stuff > that belongs in userspace. Thanks again for your answer. There is "LED Page" defined in HID Usage Tables. However, I can't find any drivers that implement it. But maybe I'm looking in the wrong direction. Best regards, Kirill Yatsenko On Fri, 19 Jan 2024 at 13:07, Greg KH <greg@kroah.com> wrote: > On Fri, Jan 19, 2024 at 12:45:52PM +0100, Kirill Yatsenko wrote: > > Hello Greg, > > > > Thanks for the suggestions! > > Yes, it will be better to implement the communication from the userspace. > > > > However, I was curious if the kernel implements some generic LED HID > > interface already, > > without the need to write custom code. Similarly, as it's done for > example > > for the HID multitouch, > > where the device only needs to report the correct report descriptor. > > I do not think there is a generic HID description yet, is there? If so, > the kernel should support it, otherwise it is all vendor-specific stuff > that belongs in userspace. > > thanks, > > greg k-h > [-- Attachment #1.2: Type: text/html, Size: 2134 bytes --] [-- Attachment #2: Type: text/plain, Size: 170 bytes --] _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2024-01-19 12:41 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2024-01-19 10:21 Generic USB LED HID driver Kirill Yatsenko 2024-01-19 11:17 ` Greg KH 2024-01-19 11:45 ` Kirill Yatsenko 2024-01-19 12:07 ` Greg KH 2024-01-19 12:40 ` Kirill Yatsenko
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