67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
|
/*
|
||
|
|
* A dummy STM device for stm/stm_source class testing.
|
||
|
|
* Copyright (c) 2014, Intel Corporation.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms and conditions of the GNU General Public License,
|
||
|
|
* version 2, as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||
|
|
* more details.
|
||
|
|
*
|
||
|
|
* STM class implements generic infrastructure for System Trace Module devices
|
||
|
|
* as defined in MIPI STPv2 specification.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#undef DEBUG
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/stm.h>
|
||
|
|
|
||
|
|
static ssize_t
|
||
|
|
dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
|
||
|
|
unsigned int channel, unsigned int packet, unsigned int flags,
|
||
|
|
unsigned int size, const unsigned char *payload)
|
||
|
|
{
|
||
|
|
#ifdef DEBUG
|
||
|
|
u64 pl = 0;
|
||
|
|
|
||
|
|
if (payload)
|
||
|
|
pl = *(u64 *)payload;
|
||
|
|
|
||
|
|
if (size < 8)
|
||
|
|
pl &= (1ull << (size * 8)) - 1;
|
||
|
|
trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel,
|
||
|
|
packet, size, pl);
|
||
|
|
#endif
|
||
|
|
return size;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct stm_data dummy_stm = {
|
||
|
|
.name = "dummy_stm",
|
||
|
|
.sw_start = 0x0000,
|
||
|
|
.sw_end = 0xffff,
|
||
|
|
.sw_nchannels = 0xffff,
|
||
|
|
.packet = dummy_stm_packet,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int dummy_stm_init(void)
|
||
|
|
{
|
||
|
|
return stm_register_device(NULL, &dummy_stm, THIS_MODULE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void dummy_stm_exit(void)
|
||
|
|
{
|
||
|
|
stm_unregister_device(&dummy_stm);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(dummy_stm_init);
|
||
|
|
module_exit(dummy_stm_exit);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL v2");
|
||
|
|
MODULE_DESCRIPTION("dummy_stm device");
|
||
|
|
MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
|