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Commit 2c415381 authored by Alexander Shishkin's avatar Alexander Shishkin Committed by Greg Kroah-Hartman
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stm class: dummy_stm: Add dummy driver for testing stm class



This is a simple module that pretends to be an stm device and discards
all the data that comes in. Useful for testing stm class and its users.

Reviewed-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a961e698
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@@ -6,3 +6,11 @@ config STM
	  Examples of such devices are Intel(R) Trace Hub and Coresight STM.

	  Say Y here to enable System Trace Module device support.

config STM_DUMMY
	tristate "Dummy STM driver"
	help
	  This is a simple dummy device that pretends to be an stm device
	  and discards your data. Use for stm class testing.

	  If you don't know what this is, say N.
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obj-$(CONFIG_STM)	+= stm_core.o

stm_core-y		:= core.o policy.o

obj-$(CONFIG_STM_DUMMY)	+= dummy_stm.o
+66 −0
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/*
 * 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>");