// 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(&reg_event_seqnum),				 &reg_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(&reg_event_genl_family, skb, 0, 0, GFP_ATOMIC); 	return size;} static int __init reg_event_genetlink_init(void){	return genl_register_family(&reg_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);