^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * event.c - exporting ACPI events via procfs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/acpi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <net/netlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <net/genetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /* ACPI notifier chain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct acpi_bus_event event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) strcpy(event.device_class, dev->pnp.device_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) strcpy(event.bus_id, dev->pnp.bus_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) event.type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) event.data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) == NOTIFY_BAD) ? -EINVAL : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) EXPORT_SYMBOL(acpi_notifier_call_chain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) int register_acpi_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return blocking_notifier_chain_register(&acpi_chain_head, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) EXPORT_SYMBOL(register_acpi_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int unregister_acpi_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) EXPORT_SYMBOL(unregister_acpi_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #ifdef CONFIG_NET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static unsigned int acpi_event_seqnum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct acpi_genl_event {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) acpi_device_class device_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) char bus_id[15];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) u32 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u32 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) /* attributes of acpi_genl_family */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ACPI_GENL_ATTR_UNSPEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) __ACPI_GENL_ATTR_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* commands supported by the acpi_genl_family */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ACPI_GENL_CMD_UNSPEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) __ACPI_GENL_CMD_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #define ACPI_GENL_FAMILY_NAME "acpi_event"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #define ACPI_GENL_VERSION 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) static const struct genl_multicast_group acpi_event_mcgrps[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) { .name = ACPI_GENL_MCAST_GROUP_NAME, },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static struct genl_family acpi_event_genl_family __ro_after_init = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .module = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .name = ACPI_GENL_FAMILY_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) .version = ACPI_GENL_VERSION,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) .maxattr = ACPI_GENL_ATTR_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) .mcgrps = acpi_event_mcgrps,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int acpi_bus_generate_netlink_event(const char *device_class,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) const char *bus_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) u8 type, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct nlattr *attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct acpi_genl_event *event;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) void *msg_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* allocate memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) size = nla_total_size(sizeof(struct acpi_genl_event)) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) nla_total_size(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) skb = genlmsg_new(size, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* add the genetlink message header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) &acpi_event_genl_family, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ACPI_GENL_CMD_EVENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (!msg_header) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) nlmsg_free(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* fill the data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) sizeof(struct acpi_genl_event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (!attr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) nlmsg_free(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) event = nla_data(attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) memset(event, 0, sizeof(struct acpi_genl_event));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) strscpy(event->device_class, device_class, sizeof(event->device_class));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) strscpy(event->bus_id, bus_id, sizeof(event->bus_id));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) event->type = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) event->data = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /* send multicast genetlink message */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) genlmsg_end(skb, msg_header);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static int __init acpi_event_genetlink_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return genl_register_family(&acpi_event_genl_family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) int acpi_bus_generate_netlink_event(const char *device_class,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) const char *bus_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) u8 type, int data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static int acpi_event_genetlink_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static int __init acpi_event_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (acpi_disabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* create genetlink for acpi event */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) error = acpi_event_genetlink_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) printk(KERN_WARNING PREFIX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) "Failed to create genetlink family for ACPI event\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) fs_initcall(acpi_event_init);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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