Quelle  sampling.c   Sprache: C

// SPDX-License-Identifier: LGPL-2.1+
// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <thermal.h>
#include "thermal_nl.h"

static int handle_thermal_sample(struct nl_msg *n, void *arg)
{
 struct nlmsghdr *nlh = nlmsg_hdr(n);
 struct genlmsghdr *genlhdr = genlmsg_hdr(nlh);
 struct nlattr *attrs[THERMAL_GENL_ATTR_MAX + 1];
 struct thermal_handler_param *thp = arg;
 struct thermal_handler *th = thp->th;

 arg = thp->arg;

 genlmsg_parse(nlh, 0, attrs, THERMAL_GENL_ATTR_MAX, NULL);

 switch (genlhdr->cmd) {

 case THERMAL_GENL_SAMPLING_TEMP:
  return th->ops->sampling.tz_temp(
   nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
   nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TEMP]), arg);
 default:
  return THERMAL_ERROR;
 }
}

thermal_error_t thermal_sampling_handle(struct thermal_handler *th, void *arg)
{
 struct thermal_handler_param thp = { .th = th, .arg = arg };

 if (!th)
  return THERMAL_ERROR;

 if (nl_cb_set(th->cb_sampling, NL_CB_VALID, NL_CB_CUSTOM,
        handle_thermal_sample, &thp))
  return THERMAL_ERROR;

 return nl_recvmsgs(th->sk_sampling, th->cb_sampling);
}

int thermal_sampling_fd(struct thermal_handler *th)
{
 if (!th)
  return -1;

 return nl_socket_get_fd(th->sk_sampling);
}

thermal_error_t thermal_sampling_exit(struct thermal_handler *th)
{
 if (nl_unsubscribe_thermal(th->sk_sampling, th->cb_sampling,
       THERMAL_GENL_SAMPLING_GROUP_NAME))
  return THERMAL_ERROR;

 nl_thermal_disconnect(th->sk_sampling, th->cb_sampling);

 return THERMAL_SUCCESS;
}

thermal_error_t thermal_sampling_init(struct thermal_handler *th)
{
 if (nl_thermal_connect(&th->sk_sampling, &th->cb_sampling))
  return THERMAL_ERROR;

 if (nl_subscribe_thermal(th->sk_sampling, th->cb_sampling,
     THERMAL_GENL_SAMPLING_GROUP_NAME))
  return THERMAL_ERROR;

 return THERMAL_SUCCESS;
}