linux-kernel - Re: [PATCHv2 2/4] mailbox: Introduce a new common API

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Date:	Thu, 9 May 2013 22:11:10 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	Suman Anna <s-anna@...com>
Cc:	Jassi Brar <jassisinghbrar@...il.com>,
	"Loic PALLARDY (loic.pallardy@...com)" <loic.pallardy@...com>,
	Arnd Bergmann <arnd@...db.de>,
	lkml <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv2 2/4] mailbox: Introduce a new common API

On 9 May 2013 22:01, Suman Anna <s-anna@...com> wrote:
> Hi Jassi,
>
> On 05/06/2013 02:24 AM, Jassi Brar wrote:
>> +++ b/include/linux/mailbox_client.h
>> @@ -0,0 +1,85 @@
>> +/*
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#ifndef __MAILBOX_CLIENT_H
>> +#define __MAILBOX_CLIENT_H
>> +
>> +#include <linux/mailbox.h>
>> +
>> +/**
>> + * struct ipc_client - User of a mailbox
>> + * @chan_name: the "controller:channel" this client wants
>> + * @rxcb: atomic callback to provide client the data received
>> + * @txcb: atomic callback to tell client of data transmission
>> + * @tx_block: if the ipc_send_message should block until data is transmitted
>> + * @tx_tout: Max block period in ms before TX is assumed failure
>> + * @knows_txdone: if the client could run the TX state machine. Usually if
>> + *    the client receives some ACK packet for transmission. Unused if the
>> + *    controller already has TX_Done/RTR IRQ.
>> + * @cntlr_data: Optional controller specific parameters during channel request
>> + */
>> +struct ipc_client {
>> +     char *chan_name;
>> +     void (*rxcb)(void *data);
>> +     void (*txcb)(request_token_t t, enum xfer_result r);
>
> We have to introduce a callback data pointer, so that the calling
> clients can retrieve a context object variable or some other useful
> data within the callback functions, just like most normal callback
> function declarations and registrations do.
>
I meant the request_token_t for the purpose. That's how we do with DMAEngine.

Regards,
-Jassi
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