116 строки
2.6 KiB
C
116 строки
2.6 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 notrace
|
|
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;
|
|
}
|
|
|
|
#define DUMMY_STM_MAX 32
|
|
|
|
static struct stm_data dummy_stm[DUMMY_STM_MAX];
|
|
|
|
static int nr_dummies = 4;
|
|
|
|
module_param(nr_dummies, int, 0400);
|
|
|
|
static unsigned int fail_mode;
|
|
|
|
module_param(fail_mode, int, 0600);
|
|
|
|
static int dummy_stm_link(struct stm_data *data, unsigned int master,
|
|
unsigned int channel)
|
|
{
|
|
if (fail_mode && (channel & fail_mode))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int dummy_stm_init(void)
|
|
{
|
|
int i, ret = -ENOMEM;
|
|
|
|
if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < nr_dummies; i++) {
|
|
dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
|
|
if (!dummy_stm[i].name)
|
|
goto fail_unregister;
|
|
|
|
dummy_stm[i].sw_start = 0x0000;
|
|
dummy_stm[i].sw_end = 0xffff;
|
|
dummy_stm[i].sw_nchannels = 0xffff;
|
|
dummy_stm[i].packet = dummy_stm_packet;
|
|
dummy_stm[i].link = dummy_stm_link;
|
|
|
|
ret = stm_register_device(NULL, &dummy_stm[i], THIS_MODULE);
|
|
if (ret)
|
|
goto fail_free;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_unregister:
|
|
for (i--; i >= 0; i--) {
|
|
stm_unregister_device(&dummy_stm[i]);
|
|
fail_free:
|
|
kfree(dummy_stm[i].name);
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
static void dummy_stm_exit(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < nr_dummies; i++) {
|
|
stm_unregister_device(&dummy_stm[i]);
|
|
kfree(dummy_stm[i].name);
|
|
}
|
|
}
|
|
|
|
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>");
|