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linux/samples/rpmsg/rpmsg_client_sample.c at multikernel-arm · multikernel/linux · GitHub
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rpmsg_client_sample.c
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samples
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rpmsg
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rpmsg_client_sample.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Remote processor messaging - sample client driver
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Copyright (C) 2011 Google, Inc.
*
* Ohad Ben-Cohen <ohad@wizery.com>
* Brian Swetland <swetland@google.com>
*/
#include
<linux/kernel.h>
#include
<linux/module.h>
#include
<linux/rpmsg.h>
#define
MSG
"hello world!"
static
int
count
=
100
;
module_param
(
count
,
int
,
0644
);
struct
instance_data
{
int
rx_count
;
};
static
int
rpmsg_sample_cb
(
struct
rpmsg_device
*
rpdev
,
void
*
data
,
int
len
,
void
*
priv
,
u32
src
)
{
int
ret
;
struct
instance_data
*
idata
=
dev_get_drvdata
(
&
rpdev
->
dev
);
dev_info
(
&
rpdev
->
dev
,
"incoming msg %d (src: 0x%x)\n"
,
++
idata
->
rx_count
,
src
);
print_hex_dump_debug
(
__func__
,
DUMP_PREFIX_NONE
,
16
,
1
,
data
,
len
,
true);
/* samples should not live forever */
if
(
idata
->
rx_count
>=
count
) {
dev_info
(
&
rpdev
->
dev
,
"goodbye!\n"
);
return
0
;
}
/* send a new message now */
ret
=
rpmsg_send
(
rpdev
->
ept
,
MSG
,
strlen
(
MSG
));
if
(
ret
)
dev_err
(
&
rpdev
->
dev
,
"rpmsg_send failed: %d\n"
,
ret
);
return
0
;
}
static
int
rpmsg_sample_probe
(
struct
rpmsg_device
*
rpdev
)
{
int
ret
;
struct
instance_data
*
idata
;
dev_info
(
&
rpdev
->
dev
,
"new channel: 0x%x -> 0x%x!\n"
,
rpdev
->
src
,
rpdev
->
dst
);
idata
=
devm_kzalloc
(
&
rpdev
->
dev
,
sizeof
(
*
idata
),
GFP_KERNEL
);
if
(!
idata
)
return
-
ENOMEM
;
dev_set_drvdata
(
&
rpdev
->
dev
,
idata
);
/* send a message to our remote processor */
ret
=
rpmsg_send
(
rpdev
->
ept
,
MSG
,
strlen
(
MSG
));
if
(
ret
) {
dev_err
(
&
rpdev
->
dev
,
"rpmsg_send failed: %d\n"
,
ret
);
return
ret
;
}
return
0
;
}
static
void
rpmsg_sample_remove
(
struct
rpmsg_device
*
rpdev
)
{
dev_info
(
&
rpdev
->
dev
,
"rpmsg sample client driver is removed\n"
);
}
static
struct
rpmsg_device_id
rpmsg_driver_sample_id_table
[]
=
{
{ .
name
=
"rpmsg-client-sample"
},
{ },
};
MODULE_DEVICE_TABLE
(
rpmsg
,
rpmsg_driver_sample_id_table
);
static
struct
rpmsg_driver
rpmsg_sample_client
=
{
.
drv
.
name
=
KBUILD_MODNAME
,
.
id_table
=
rpmsg_driver_sample_id_table
,
.
probe
=
rpmsg_sample_probe
,
.
callback
=
rpmsg_sample_cb
,
.
remove
=
rpmsg_sample_remove
,
};
module_rpmsg_driver
(
rpmsg_sample_client
);
MODULE_DESCRIPTION
(
"Remote processor messaging sample client driver"
);
MODULE_LICENSE
(
"GPL v2"
);
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