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// SPDX-License-Identifier: LGPL-2.1+
// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <thermal.h>
#include "thermal_nl.h"
static struct nla_policy thermal_genl_policy[THERMAL_GENL_ATTR_MAX + 1] = {
/* Thermal zone */
[THERMAL_GENL_ATTR_TZ] = { .type = NLA_NESTED },
[THERMAL_GENL_ATTR_TZ_ID] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_TEMP] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_TRIP] = { .type = NLA_NESTED },
[THERMAL_GENL_ATTR_TZ_TRIP_ID] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_TRIP_TEMP] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_TRIP_TYPE] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_TRIP_HYST] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_MODE] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_CDEV_WEIGHT] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_TZ_NAME] = { .type = NLA_STRING },
/* Governor(s) */
[THERMAL_GENL_ATTR_TZ_GOV] = { .type = NLA_NESTED },
[THERMAL_GENL_ATTR_TZ_GOV_NAME] = { .type = NLA_STRING },
/* Cooling devices */
[THERMAL_GENL_ATTR_CDEV] = { .type = NLA_NESTED },
[THERMAL_GENL_ATTR_CDEV_ID] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_CDEV_CUR_STATE] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_CDEV_MAX_STATE] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_CDEV_NAME] = { .type = NLA_STRING },
};
static int parse_tz_get(struct genl_info *info, struct thermal_zone **tz)
{
struct nlattr *attr;
struct thermal_zone *__tz = NULL;
size_t size = 0;
int rem;
nla_for_each_nested(attr, info->attrs[THERMAL_GENL_ATTR_TZ], rem) {
if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_ID) {
size++;
__tz = realloc(__tz, sizeof(*__tz) * (size + 2));
if (!__tz)
return THERMAL_ERROR;
__tz[size - 1].id = nla_get_u32(attr);
}
if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_NAME)
nla_strlcpy(__tz[size - 1].name, attr,
THERMAL_NAME_LENGTH);
}
if (__tz)
__tz[size].id = -1;
*tz = __tz;
return THERMAL_SUCCESS;
}
static int parse_cdev_get(struct genl_info *info, struct thermal_cdev **cdev)
{
struct nlattr *attr;
struct thermal_cdev *__cdev = NULL;
size_t size = 0;
int rem;
nla_for_each_nested(attr, info->attrs[THERMAL_GENL_ATTR_CDEV], rem) {
if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_ID) {
size++;
__cdev = realloc(__cdev, sizeof(*__cdev) * (size + 2));
if (!__cdev)
return THERMAL_ERROR;
__cdev[size - 1].id = nla_get_u32(attr);
}
if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_NAME) {
nla_strlcpy(__cdev[size - 1].name, attr,
THERMAL_NAME_LENGTH);
}
if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_CUR_STATE)
__cdev[size - 1].cur_state = nla_get_u32(attr);
if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_MAX_STATE)
__cdev[size - 1].max_state = nla_get_u32(attr);
}
if (__cdev)
__cdev[size].id = -1;
*cdev = __cdev;
return THERMAL_SUCCESS;
}
static int parse_tz_get_trip(struct genl_info *info, struct thermal_zone *tz)
{
struct nlattr *attr;
struct thermal_trip *__tt = NULL;
size_t size = 0;
int rem;
nla_for_each_nested(attr, info->attrs[THERMAL_GENL_ATTR_TZ_TRIP], rem) {
if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_ID) {
size++;
__tt = realloc(__tt, sizeof(*__tt) * (size + 2));
if (!__tt)
return THERMAL_ERROR;
__tt[size - 1].id = nla_get_u32(attr);
}
if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_TYPE)
__tt[size - 1].type = nla_get_u32(attr);
if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_TEMP)
__tt[size - 1].temp = nla_get_u32(attr);
if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_HYST)
__tt[size - 1].hyst = nla_get_u32(attr);
}
if (__tt)
__tt[size].id = -1;
tz->trip = __tt;
return THERMAL_SUCCESS;
}
static int parse_tz_get_temp(struct genl_info *info, struct thermal_zone *tz)
{
int id = -1;
if (info->attrs[THERMAL_GENL_ATTR_TZ_ID])
id = nla_get_u32(info->attrs[THERMAL_GENL_ATTR_TZ_ID]);
if (tz->id != id)
return THERMAL_ERROR;
if (info->attrs[THERMAL_GENL_ATTR_TZ_TEMP])
tz->temp = nla_get_u32(info->attrs[THERMAL_GENL_ATTR_TZ_TEMP]);
return THERMAL_SUCCESS;
}
static int parse_tz_get_gov(struct genl_info *info, struct thermal_zone *tz)
{
int id = -1;
if (info->attrs[THERMAL_GENL_ATTR_TZ_ID])
id = nla_get_u32(info->attrs[THERMAL_GENL_ATTR_TZ_ID]);
if (tz->id != id)
return THERMAL_ERROR;
if (info->attrs[THERMAL_GENL_ATTR_TZ_GOV_NAME]) {
nla_strlcpy(tz->governor,
info->attrs[THERMAL_GENL_ATTR_TZ_GOV_NAME],
THERMAL_NAME_LENGTH);
}
return THERMAL_SUCCESS;
}
static int handle_netlink(struct nl_cache_ops *unused,
struct genl_cmd *cmd,
struct genl_info *info, void *arg)
{
int ret;
switch (cmd->c_id) {
case THERMAL_GENL_CMD_TZ_GET_ID:
ret = parse_tz_get(info, arg);
break;
case THERMAL_GENL_CMD_CDEV_GET:
ret = parse_cdev_get(info, arg);
break;
case THERMAL_GENL_CMD_TZ_GET_TEMP:
ret = parse_tz_get_temp(info, arg);
break;
case THERMAL_GENL_CMD_TZ_GET_TRIP:
ret = parse_tz_get_trip(info, arg);
break;
case THERMAL_GENL_CMD_TZ_GET_GOV:
ret = parse_tz_get_gov(info, arg);
break;
default:
return THERMAL_ERROR;
}
return ret;
}
static struct genl_cmd thermal_cmds[] = {
{
.c_id = THERMAL_GENL_CMD_TZ_GET_ID,
.c_name = (char *)"List thermal zones",
.c_msg_parser = handle_netlink,
.c_maxattr = THERMAL_GENL_ATTR_MAX,
.c_attr_policy = thermal_genl_policy,
},
{
.c_id = THERMAL_GENL_CMD_TZ_GET_GOV,
.c_name = (char *)"Get governor",
.c_msg_parser = handle_netlink,
.c_maxattr = THERMAL_GENL_ATTR_MAX,
.c_attr_policy = thermal_genl_policy,
},
{
.c_id = THERMAL_GENL_CMD_TZ_GET_TEMP,
.c_name = (char *)"Get thermal zone temperature",
.c_msg_parser = handle_netlink,
.c_maxattr = THERMAL_GENL_ATTR_MAX,
.c_attr_policy = thermal_genl_policy,
},
{
.c_id = THERMAL_GENL_CMD_TZ_GET_TRIP,
.c_name = (char *)"Get thermal zone trip points",
.c_msg_parser = handle_netlink,
.c_maxattr = THERMAL_GENL_ATTR_MAX,
.c_attr_policy = thermal_genl_policy,
},
{
.c_id = THERMAL_GENL_CMD_CDEV_GET,
.c_name = (char *)"Get cooling devices",
.c_msg_parser = handle_netlink,
.c_maxattr = THERMAL_GENL_ATTR_MAX,
.c_attr_policy = thermal_genl_policy,
},
};
static struct genl_ops thermal_cmd_ops = {
.o_name = (char *)"thermal",
.o_cmds = thermal_cmds,
.o_ncmds = ARRAY_SIZE(thermal_cmds),
};
struct cmd_param {
int tz_id;
};
typedef int (*cmd_cb_t)(struct nl_msg *, struct cmd_param *);
static int thermal_genl_tz_id_encode(struct nl_msg *msg, struct cmd_param *p)
{
if (p->tz_id >= 0 && nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, p->tz_id))
return -1;
return 0;
}
static thermal_error_t thermal_genl_auto(struct thermal_handler *th, cmd_cb_t cmd_cb,
struct cmd_param *param,
int cmd, int flags, void *arg)
{
thermal_error_t ret = THERMAL_ERROR;
struct nl_msg *msg;
void *hdr;
msg = nlmsg_alloc();
if (!msg)
return THERMAL_ERROR;
hdr = genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, thermal_cmd_ops.o_id,
0, flags, cmd, THERMAL_GENL_VERSION);
if (!hdr)
goto out;
if (cmd_cb && cmd_cb(msg, param))
goto out;
if (nl_send_msg(th->sk_cmd, th->cb_cmd, msg, genl_handle_msg, arg))
goto out;
ret = THERMAL_SUCCESS;
out:
nlmsg_free(msg);
return ret;
}
thermal_error_t thermal_cmd_get_tz(struct thermal_handler *th, struct thermal_zone **tz)
{
return thermal_genl_auto(th, NULL, NULL, THERMAL_GENL_CMD_TZ_GET_ID,
NLM_F_DUMP | NLM_F_ACK, tz);
}
thermal_error_t thermal_cmd_get_cdev(struct thermal_handler *th, struct thermal_cdev **tc)
{
return thermal_genl_auto(th, NULL, NULL, THERMAL_GENL_CMD_CDEV_GET,
NLM_F_DUMP | NLM_F_ACK, tc);
}
thermal_error_t thermal_cmd_get_trip(struct thermal_handler *th, struct thermal_zone *tz)
{
struct cmd_param p = { .tz_id = tz->id };
return thermal_genl_auto(th, thermal_genl_tz_id_encode, &p,
THERMAL_GENL_CMD_TZ_GET_TRIP, 0, tz);
}
thermal_error_t thermal_cmd_get_governor(struct thermal_handler *th, struct thermal_zone *tz)
{
struct cmd_param p = { .tz_id = tz->id };
return thermal_genl_auto(th, thermal_genl_tz_id_encode, &p,
THERMAL_GENL_CMD_TZ_GET_GOV, 0, tz);
}
thermal_error_t thermal_cmd_get_temp(struct thermal_handler *th, struct thermal_zone *tz)
{
struct cmd_param p = { .tz_id = tz->id };
return thermal_genl_auto(th, thermal_genl_tz_id_encode, &p,
THERMAL_GENL_CMD_TZ_GET_TEMP, 0, tz);
}
thermal_error_t thermal_cmd_exit(struct thermal_handler *th)
{
if (genl_unregister_family(&thermal_cmd_ops))
return THERMAL_ERROR;
nl_thermal_disconnect(th->sk_cmd, th->cb_cmd);
return THERMAL_SUCCESS;
}
thermal_error_t thermal_cmd_init(struct thermal_handler *th)
{
int ret;
int family;
if (nl_thermal_connect(&th->sk_cmd, &th->cb_cmd))
return THERMAL_ERROR;
ret = genl_register_family(&thermal_cmd_ops);
if (ret)
return THERMAL_ERROR;
ret = genl_ops_resolve(th->sk_cmd, &thermal_cmd_ops);
if (ret)
return THERMAL_ERROR;
family = genl_ctrl_resolve(th->sk_cmd, "nlctrl");
if (family != GENL_ID_CTRL)
return THERMAL_ERROR;
return THERMAL_SUCCESS;
}
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