2c41538191
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: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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* A dummy STM device for stm/stm_source class testing.
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* STM class implements generic infrastructure for System Trace Module devices
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* as defined in MIPI STPv2 specification.
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*/
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#undef DEBUG
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/stm.h>
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static ssize_t
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dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
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unsigned int channel, unsigned int packet, unsigned int flags,
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unsigned int size, const unsigned char *payload)
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{
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#ifdef DEBUG
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u64 pl = 0;
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if (payload)
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pl = *(u64 *)payload;
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if (size < 8)
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pl &= (1ull << (size * 8)) - 1;
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trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel,
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packet, size, pl);
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#endif
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return size;
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}
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static struct stm_data dummy_stm = {
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.name = "dummy_stm",
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.sw_start = 0x0000,
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.sw_end = 0xffff,
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.sw_nchannels = 0xffff,
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.packet = dummy_stm_packet,
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};
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static int dummy_stm_init(void)
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{
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return stm_register_device(NULL, &dummy_stm, THIS_MODULE);
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}
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static void dummy_stm_exit(void)
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{
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stm_unregister_device(&dummy_stm);
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}
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module_init(dummy_stm_init);
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module_exit(dummy_stm_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("dummy_stm device");
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MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
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