[Bluez-devel] boot vs. report protocol

[Bluez-devel] boot vs. report protocol

[Ortwin Glück]

Hi,

In net/bluetooth/core.c there is:

	if (session->input) {
		hidp_send_ctrl_message(session,
			HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_BOOT, NULL, 0);
		session->flags |= (1 << HIDP_BOOT_PROTOCOL_MODE);

		session->leds = 0xff;
		hidp_input_event(session->input, EV_LED, 0, 0);
	}


which effectively sets the boot protocol for all input devices. To
support some scroll wheel mice they need to be put into report mode, though:

	if (session->input) {
		hidp_send_ctrl_message(session,
			HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_REPORT, NULL, 0);

		session->leds = 0xff;
		hidp_input_event(session->input, EV_LED, 0, 0);
	}

I assume that's safe. Solaris for instance, initializes all devices in
report mode by default. It never even tries boot protocol.

Maybe it would make sense to have a userspace interface to switch the
mode from within hidd.


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Re: [Bluez-devel] boot vs. report protocol

[Marcel Holtmann]

Hi Ortwin,

> In net/bluetooth/core.c there is:
> 
> 	if (session->input) {
> 		hidp_send_ctrl_message(session,
> 			HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_BOOT, NULL, 0);
> 		session->flags |= (1 << HIDP_BOOT_PROTOCOL_MODE);
> 
> 		session->leds = 0xff;
> 		hidp_input_event(session->input, EV_LED, 0, 0);
> 	}
> 
> 
> which effectively sets the boot protocol for all input devices. To
> support some scroll wheel mice they need to be put into report mode, though:
> 
> 	if (session->input) {
> 		hidp_send_ctrl_message(session,
> 			HIDP_TRANS_SET_PROTOCOL | HIDP_PROTO_REPORT, NULL, 0);
> 
> 		session->leds = 0xff;
> 		hidp_input_event(session->input, EV_LED, 0, 0);
> 	}
> 
> I assume that's safe. Solaris for instance, initializes all devices in
> report mode by default. It never even tries boot protocol.

you assumption is wrong. The flags variable doesn't change anything. You
might wanna try 2.6.20-mh1 which is the first one that includes the
official report mode support.

Regards

Marcel



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