lkml.org 
[lkml]   [2013]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHv2 2/4] mailbox: Introduce a new common API
On 05/09/2013 11:41 AM, Jassi Brar wrote:
> On 9 May 2013 22:01, Suman Anna <s-anna@ti.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.

I faced this issue on the rxcb while adopting the
omap_rproc_mbox_callback. omap_remoteproc is a common driver for all the
OMAP co-processors and there can be multiple instances, providing the
same set of features. Look at the code in
drivers/remoteproc/omap_remoteproc.c and you will get the idea. But in
general, the users registering callback functions would prefer to get
some context pointer back.

regards
Suman



\
 
 \ /
  Last update: 2013-05-09 19:21    [W:0.097 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site