LXR linux/drivers/hwtracing/stm/p

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Basic framing protocol for STM devices.
   4 * Copyright (c) 2018, Intel Corporation.
   5 */
   6
   7#include <linux/module.h>
   8#include <linux/device.h>
   9#include <linux/stm.h>
  10#include "stm.h"
  11
  12static ssize_t basic_write(struct stm_data *data, struct stm_output *output,
  13                           unsigned int chan, const char *buf, size_t count)
  14{
  15        unsigned int c = output->channel + chan;
  16        unsigned int m = output->master;
  17        const unsigned char nil = 0;
  18        ssize_t sz;
  19
  20        sz = stm_data_write(data, m, c, true, buf, count);
  21        if (sz > 0)
  22                data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil);
  23
  24        return sz;
  25}
  26
  27static const struct stm_protocol_driver basic_pdrv = {
  28        .owner  = THIS_MODULE,
  29        .name   = "p_basic",
  30        .write  = basic_write,
  31};
  32
  33static int basic_stm_init(void)
  34{
  35        return stm_register_protocol(&basic_pdrv);
  36}
  37
  38static void basic_stm_exit(void)
  39{
  40        stm_unregister_protocol(&basic_pdrv);
  41}
  42
  43module_init(basic_stm_init);
  44module_exit(basic_stm_exit);
  45
  46MODULE_LICENSE("GPL v2");
  47MODULE_DESCRIPTION("Basic STM framing protocol driver");
  48MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
  49