[PATCHv9 06/15] rc: Add HDMI CEC protocol handling

[Hans Verkuil]

On 10/06/2015 08:05 PM, Russell King - ARM Linux wrote:
> On Mon, Sep 07, 2015 at 03:44:35PM +0200, Hans Verkuil wrote:
>> From: Kamil Debski <kamil at wypas.org>
>>
>> Add handling of remote control events coming from the HDMI CEC bus.
>> This patch includes a new keymap that maps values found in the CEC
>> messages to the keys pressed and released. Also, a new protocol has
>> been added to the core.
>>
>> Signed-off-by: Kamil Debski <kamil at wypas.org>
>> Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com>
> 
> (Added Mauro)
> 
> Hmm, how is rc-cec supposed to be loaded?

Is CONFIG_RC_MAP enabled in your config? Ran 'depmod -a'? (Sorry, I'm sure you've done
that, just checking...)

It's optional as I understand it, since you could configure the keytable from
userspace instead of using this module.

For the record (just tried it), it does load fine on my setup.

BTW, I am still on the fence whether using the kernel RC subsystem is the
right thing to do. There are a number of CEC RC commands that use extra parameters
that cannot be mapped to the RC API, so you still need to handle those manually.

I know Mauro would like to see this integration, but I am wondering whether it
really makes sense.

What is your opinion on this?

Perhaps I should split it off into a separate patch and keep it out from the initial
pull request once we're ready for that.

Regards,

	Hans

> 
> At boot, I see:
> 
> [   16.577704] IR keymap rc-cec not found
> [   16.586675] Registered IR keymap rc-empty
> [   16.591668] input: RC for dw_hdmi as /devices/soc0/soc/120000.hdmi/rc/rc1/input3
> [   16.597769] rc1: RC for dw_hdmi as /devices/soc0/soc/120000.hdmi/rc/rc1
> 
> Yet the rc-cec is a module in the filesystem, but it doesn't seem to
> be loaded automatically - even after the system has booted, the module
> hasn't been loaded.
> 
> It looks like it _should_ be loaded, but this plainly isn't working:
> 
>         map = seek_rc_map(name);
> #ifdef MODULE
>         if (!map) {
>                 int rc = request_module("%s", name);
>                 if (rc < 0) {
>                         printk(KERN_ERR "Couldn't load IR keymap %s\n", name);
>                         return NULL;
>                 }
>                 msleep(20);     /* Give some time for IR to register */
> 
>                 map = seek_rc_map(name);
>         }
> #endif
>         if (!map) {
>                 printk(KERN_ERR "IR keymap %s not found\n", name);
>                 return NULL;
>         }
> 
> Any ideas?
>