From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/acpi/event.c | 184 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 184 insertions(+) create mode 100644 drivers/acpi/event.c (limited to 'drivers/acpi/event.c') diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c new file mode 100644 index 000000000..4d840d2e7 --- /dev/null +++ b/drivers/acpi/event.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * event.c - exporting ACPI events via procfs + * + * Copyright (C) 2001, 2002 Andy Grover + * Copyright (C) 2001, 2002 Paul Diefenbaugh + * + */ + +#define pr_fmt(fmt) "ACPI: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +/* ACPI notifier chain */ +static BLOCKING_NOTIFIER_HEAD(acpi_chain_head); + +int acpi_notifier_call_chain(const char *device_class, + const char *bus_id, u32 type, u32 data) +{ + struct acpi_bus_event event; + + strscpy(event.device_class, device_class); + strscpy(event.bus_id, bus_id); + event.type = type; + event.data = data; + return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event) + == NOTIFY_BAD) ? -EINVAL : 0; +} +EXPORT_SYMBOL(acpi_notifier_call_chain); + +int register_acpi_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&acpi_chain_head, nb); +} +EXPORT_SYMBOL(register_acpi_notifier); + +int unregister_acpi_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_unregister(&acpi_chain_head, nb); +} +EXPORT_SYMBOL(unregister_acpi_notifier); + +#ifdef CONFIG_NET +static unsigned int acpi_event_seqnum; +struct acpi_genl_event { + acpi_device_class device_class; + char bus_id[15]; + u32 type; + u32 data; +}; + +/* attributes of acpi_genl_family */ +enum { + ACPI_GENL_ATTR_UNSPEC, + ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */ + __ACPI_GENL_ATTR_MAX, +}; +#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1) + +/* commands supported by the acpi_genl_family */ +enum { + ACPI_GENL_CMD_UNSPEC, + ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */ + __ACPI_GENL_CMD_MAX, +}; +#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1) + +#define ACPI_GENL_FAMILY_NAME "acpi_event" +#define ACPI_GENL_VERSION 0x01 +#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group" + +static const struct genl_multicast_group acpi_event_mcgrps[] = { + { .name = ACPI_GENL_MCAST_GROUP_NAME, }, +}; + +static struct genl_family acpi_event_genl_family __ro_after_init = { + .module = THIS_MODULE, + .name = ACPI_GENL_FAMILY_NAME, + .version = ACPI_GENL_VERSION, + .maxattr = ACPI_GENL_ATTR_MAX, + .mcgrps = acpi_event_mcgrps, + .n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps), +}; + +int acpi_bus_generate_netlink_event(const char *device_class, + const char *bus_id, + u8 type, int data) +{ + struct sk_buff *skb; + struct nlattr *attr; + struct acpi_genl_event *event; + void *msg_header; + int size; + + /* allocate memory */ + size = nla_total_size(sizeof(struct acpi_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, acpi_event_seqnum++, + &acpi_event_genl_family, 0, + ACPI_GENL_CMD_EVENT); + if (!msg_header) { + nlmsg_free(skb); + return -ENOMEM; + } + + /* fill the data */ + attr = + nla_reserve(skb, ACPI_GENL_ATTR_EVENT, + sizeof(struct acpi_genl_event)); + if (!attr) { + nlmsg_free(skb); + return -EINVAL; + } + + event = nla_data(attr); + memset(event, 0, sizeof(struct acpi_genl_event)); + + strscpy(event->device_class, device_class, sizeof(event->device_class)); + strscpy(event->bus_id, bus_id, sizeof(event->bus_id)); + event->type = type; + event->data = data; + + /* send multicast genetlink message */ + genlmsg_end(skb, msg_header); + + genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC); + return 0; +} + +EXPORT_SYMBOL(acpi_bus_generate_netlink_event); + +static int __init acpi_event_genetlink_init(void) +{ + return genl_register_family(&acpi_event_genl_family); +} + +#else +int acpi_bus_generate_netlink_event(const char *device_class, + const char *bus_id, + u8 type, int data) +{ + return 0; +} + +EXPORT_SYMBOL(acpi_bus_generate_netlink_event); + +static int acpi_event_genetlink_init(void) +{ + return -ENODEV; +} +#endif + +static int __init acpi_event_init(void) +{ + int error; + + if (acpi_disabled) + return 0; + + /* create genetlink for acpi event */ + error = acpi_event_genetlink_init(); + if (error) + pr_warn("Failed to create genetlink family for ACPI event\n"); + + return 0; +} + +fs_initcall(acpi_event_init); -- cgit v1.3.1