linux-kernel - Re: [PATCH] usb: gadget: f_uac2: uevent changes for uac2

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Message-ID: <b4464186-217d-4462-3062-eb84a7ad1362@quicinc.com>
Date:   Mon, 8 May 2023 20:46:35 +0530
From:   AKASH KUMAR <quic_akakum@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Jing Leng <jleng@...arella.com>,
        Pratham Pratap <quic_ppratap@...cinc.com>,
        Jack Pham <quic_jackp@...cinc.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: gadget: f_uac2: uevent changes for uac2

Thanks Greg for review, will fix the issues in version 2 patchset.

Thanks,

Akash

On 5/8/2023 5:44 PM, Greg Kroah-Hartman wrote:
> On Mon, May 08, 2023 at 05:35:35PM +0530, AKASH KUMAR wrote:
>> Adding uvent from usb audio gadget driver for
> What is a "uvent"?
>
>> uac2 playback/capture events, which userspace reads
>> and later reads sysfs entry to know if playback
>> or capture has stopped or started by host
>> application.
> Please use your full 72 columns please.
>
>> /config/usb_gadget/g1/functions/uac2.0 # cat c_status
>> 1  --> capture started
>> 0  --> capture stopped
>> /config/usb_gadget/g1/functions/uac2.0 # cat p_status
>> 1 --> playback started
>> 0 --> playback stopped
> You need to document these new files in Documentation/ABI/ right?
>
>> Signed-off-by: AKASH KUMAR <quic_akakum@...cinc.com>
> No need to UPPER CASE your name :)
>
>> ---
>>   drivers/usb/gadget/function/f_uac2.c | 57 ++++++++++++++++++++++++++++
>>   drivers/usb/gadget/function/u_uac2.h |  7 ++++
>>   2 files changed, 64 insertions(+)
>>
>> diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
>> index 0219cd79493a..d0a5fa6b49b8 100644
>> --- a/drivers/usb/gadget/function/f_uac2.c
>> +++ b/drivers/usb/gadget/function/f_uac2.c
>> @@ -1423,6 +1423,8 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
>>   	struct usb_gadget *gadget = cdev->gadget;
>>   	struct device *dev = &gadget->dev;
>>   	int ret = 0;
>> +	struct f_uac2_opts *audio_opts =
>> +		container_of(fn->fi, struct f_uac2_opts, func_inst);
>>   
>>   	/* No i/f has more than 2 alt settings */
>>   	if (alt > 1) {
>> @@ -1454,6 +1456,7 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
>>   			ret = u_audio_start_capture(&uac2->g_audio);
>>   		else
>>   			u_audio_stop_capture(&uac2->g_audio);
>> +		audio_opts->c_status = alt;
>>   	} else if (intf == uac2->as_in_intf) {
>>   		uac2->as_in_alt = alt;
>>   
>> @@ -1461,10 +1464,14 @@ afunc_set_alt(struct usb_function *fn, unsigned intf, unsigned alt)
>>   			ret = u_audio_start_playback(&uac2->g_audio);
>>   		else
>>   			u_audio_stop_playback(&uac2->g_audio);
>> +		audio_opts->p_status = alt;
>>   	} else {
>>   		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
>>   		return -EINVAL;
>>   	}
>> +#ifdef CONFIG_USB_CONFIGFS_UEVENT
>> +	schedule_work(&audio_opts->work);
>> +#endif
> Why the #ifdef?  Please never do that in .c files if at all possible.
>
>>   
>>   	return ret;
>>   }
>> @@ -1493,9 +1500,17 @@ static void
>>   afunc_disable(struct usb_function *fn)
>>   {
>>   	struct f_uac2 *uac2 = func_to_uac2(fn);
>> +	struct f_uac2_opts *audio_opts =
>> +		container_of(fn->fi, struct f_uac2_opts, func_inst);
>>   
>>   	uac2->as_in_alt = 0;
>>   	uac2->as_out_alt = 0;
>> +	audio_opts->p_status = 0;//alt;
>> +	audio_opts->c_status = 0; //alt;
>> +
>> +#ifdef CONFIG_USB_CONFIGFS_UEVENT
>> +	schedule_work(&audio_opts->work);
>> +#endif
> Same here and elsewhere in this patch.
>
> thanks,
>
> greg k-h