// SPDX-License-Identifier: GPL-2.0 /* * Regulator event over netlink * * Author: Naresh Solanki <Naresh.Solanki@9elements.com> */ #include <regulator/regulator.h> #include <net/netlink.h> #include <net/genetlink.h> #include <linux/atomic.h> #include "regnl.h" static atomic_t reg_event_seqnum = ATOMIC_INIT(0); static const struct genl_multicast_group reg_event_mcgrps[] = { { .name = REG_GENL_MCAST_GROUP_NAME, }, }; static struct genl_family reg_event_genl_family __ro_after_init = { .module = THIS_MODULE, .name = REG_GENL_FAMILY_NAME, .version = REG_GENL_VERSION, .maxattr = REG_GENL_ATTR_MAX, .mcgrps = reg_event_mcgrps, .n_mcgrps = ARRAY_SIZE(reg_event_mcgrps), }; int reg_generate_netlink_event(const char *reg_name, u64 event) { struct sk_buff *skb; struct nlattr *attr; struct reg_genl_event *edata; void *msg_header; int size; /* allocate memory */ size = nla_total_size(sizeof(struct reg_genl_event)) + nla_total_size(0); skb = genlmsg_new(size, GFP_ATOMIC); if (!skb) return -ENOMEM; /* add the genetlink message header */ msg_header = genlmsg_put(skb, 0, atomic_inc_return(®_event_seqnum), ®_event_genl_family, 0, REG_GENL_CMD_EVENT); if (!msg_header) { nlmsg_free(skb); return -ENOMEM; } /* fill the data */ attr = nla_reserve(skb, REG_GENL_ATTR_EVENT, sizeof(struct reg_genl_event)); if (!attr) { nlmsg_free(skb); return -EINVAL; } edata = nla_data(attr); memset(edata, 0, sizeof(struct reg_genl_event)); strscpy(edata->reg_name, reg_name, sizeof(edata->reg_name)); edata->event = event; /* send multicast genetlink message */ genlmsg_end(skb, msg_header); size = genlmsg_multicast(®_event_genl_family, skb, 0, 0, GFP_ATOMIC); return size; } static int __init reg_event_genetlink_init(void) { return genl_register_family(®_event_genl_family); } static int __init reg_event_init(void) { int error; /* create genetlink for acpi event */ error = reg_event_genetlink_init(); if (error) pr_warn("Failed to create genetlink family for reg event\n"); return 0; } fs_initcall(reg_event_init);