On 07/25/17 14:34, Neil Armstrong wrote:
> Hi Hans,
>>> +static int meson_ao_cec_probe(struct platform_device *pdev)
>>> +{
>>> + struct meson_ao_cec_device *ao_cec;
>>> + struct platform_device *hdmi_dev;
>>> + struct device_node *np;
>>> + struct resource *res;
>>> + int ret, irq;
>>> +
>>> + np = of_parse_phandle(pdev->dev.of_node, "hdmi-phandle", 0);
>>> + if (!np) {
>>> + dev_err(&pdev->dev, "Failed to find hdmi node\n");
>>> + return -ENODEV;
>>> + }
>>> +
>>> + hdmi_dev = of_find_device_by_node(np);
>>> + if (hdmi_dev == NULL)
>>> + return -EPROBE_DEFER;
>>> +
>>> + ao_cec = devm_kzalloc(&pdev->dev, sizeof(*ao_cec), GFP_KERNEL);
>>> + if (!ao_cec)
>>> + return -ENOMEM;
>>> +
>>> + spin_lock_init(&ao_cec->cec_reg_lock);
>>> +
>>> + ao_cec->notify = cec_notifier_get(&hdmi_dev->dev);
>>> + if (!ao_cec->notify)
>>> + return -ENOMEM;
>>> +
>>> + ao_cec->adap = cec_allocate_adapter(&meson_ao_cec_ops, ao_cec,
>>> + "meson_ao_cec",
>>> + CEC_CAP_LOG_ADDRS |
>>> + CEC_CAP_TRANSMIT |
>>> + CEC_CAP_RC |
>>> + CEC_CAP_PASSTHROUGH,
>>> + 1); /* Use 1 for now */
>>
>> I recommend that you add support for 2 logical addresses. More isn't allowed
>> by the CEC 2.0 spec anyway (no such restriction for CEC 1.4, but more than
>> two really isn't needed).
>
> I know, but in the "communication" register with the suspend/poweroff firmware
> that handles the wake up, only a single logical address is supported...
>
> What should I do in this case ? Which logical adress should I pass to the firmware when implementing ir ?
Ah, OK. Interesting.
>From cec-adap.c:
if (log_addrs->num_log_addrs == 2) {
if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_AUDIOSYSTEM) |
(1 << CEC_LOG_ADDR_TYPE_TV)))) {
dprintk(1, "two LAs is only allowed for audiosystem and TV\n");
return -EINVAL;
}
if (!(type_mask & ((1 << CEC_LOG_ADDR_TYPE_PLAYBACK) |
(1 << CEC_LOG_ADDR_TYPE_RECORD)))) {
dprintk(1, "an audiosystem/TV can only be combined with record or playback\n");
return -EINVAL;
}
}
So you would store the TV or AUDIOSYSTEM logical address in the firmware, since those
describe the system best.
I.e. it is a TV/Audiosystem with recording/playback capabilities.
The problem is that for CEC 1.4 no such restriction is imposed (the test above is
specific to CEC 2.0). But I think it makes sense to just check if TV/Audiosystem
is selected and pick that as the LA to store in the firmware, and otherwise just
pick the first LA (log_addr[0]).
Regards,
Hans
