Messages in this thread Patch in this message | | | From | Naresh Solanki <> | Subject | [PATCH v2] regulator: event: Add regulator netlink event support | Date | Tue, 21 Nov 2023 10:13:30 +0000 |
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This commit introduces netlink event support to the regulator subsystem.
Changes: - Introduce event.c and regnl.h for netlink event handling. - Implement reg_generate_netlink_event to broadcast regulator events. - Update Makefile to include the new event.c file.
Signed-off-by: Naresh Solanki <naresh.solanki@9elements.com> --- drivers/regulator/Makefile | 1 + drivers/regulator/core.c | 7 +- drivers/regulator/event.c | 134 +++++++++++++++++++++++++++++++++++++ drivers/regulator/regnl.h | 8 +++ 4 files changed, 149 insertions(+), 1 deletion(-) create mode 100644 drivers/regulator/event.c create mode 100644 drivers/regulator/regnl.h
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile index b2b059b5ee56..de37144e4784 100644 --- a/drivers/regulator/Makefile +++ b/drivers/regulator/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_REGULATOR) += core.o dummy.o fixed-helper.o helpers.o devres.o irq_helpers.o +obj-$(CONFIG_REGULATOR) += event.o obj-$(CONFIG_OF) += of_regulator.o obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 4aa9ec8c22f3..384ffe8618fd 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -33,6 +33,7 @@ #include "dummy.h" #include "internal.h" +#include "regnl.h" static DEFINE_WW_CLASS(regulator_ww_class); static DEFINE_MUTEX(regulator_nesting_mutex); @@ -4854,7 +4855,11 @@ static int _notifier_call_chain(struct regulator_dev *rdev, unsigned long event, void *data) { /* call rdev chain first */ - return blocking_notifier_call_chain(&rdev->notifier, event, data); + int ret = blocking_notifier_call_chain(&rdev->notifier, event, data); + + reg_generate_netlink_event(rdev_get_name(rdev), event); + + return ret; } int _regulator_bulk_get(struct device *dev, int num_consumers, diff --git a/drivers/regulator/event.c b/drivers/regulator/event.c new file mode 100644 index 000000000000..359539a2a05a --- /dev/null +++ b/drivers/regulator/event.c @@ -0,0 +1,134 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <net/netlink.h> +#include <net/genetlink.h> + +#include "regnl.h" + +#ifdef CONFIG_NET +static unsigned int reg_event_seqnum; +struct reg_genl_event { + char reg_name[15]; + u64 event; +}; + +/* attributes of reg_genl_family */ +enum { + REG_GENL_ATTR_UNSPEC, + REG_GENL_ATTR_EVENT, /* reg event info needed by user space */ + __REG_GENL_ATTR_MAX, +}; + +#define REG_GENL_ATTR_MAX (__REG_GENL_ATTR_MAX - 1) + +/* commands supported by the reg_genl_family */ +enum { + REG_GENL_CMD_UNSPEC, + REG_GENL_CMD_EVENT, /* kernel->user notifications for reg events */ + __REG_GENL_CMD_MAX, +}; + +#define REG_GENL_CMD_MAX (__REG_GENL_CMD_MAX - 1) + +#define REG_GENL_FAMILY_NAME "reg_event" +#define REG_GENL_VERSION 0x01 +#define REG_GENL_MCAST_GROUP_NAME "reg_mc_group" + +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, reg_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); + + pr_debug("%s -> %llx , ret: %x", reg_name, event, size); + if (size == -ESRCH) + pr_debug("multicast message sent, but nobody was listening...\n"); + else if (size) + pr_debug("failed to send multicast genl message\n"); + else + pr_debug("multicast message sent %d\n", reg_event_seqnum); + + return 0; +} +EXPORT_SYMBOL(reg_generate_netlink_event); + +static int __init reg_event_genetlink_init(void) +{ + return genl_register_family(®_event_genl_family); +} + +#else +int reg_generate_netlink_event(const char *reg_name, u64 event) +{ + return 0; +} +EXPORT_SYMBOL(reg_generate_netlink_event); + +static int reg_event_genetlink_init(void) +{ + return -ENODEV; +} +#endif + +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); diff --git a/drivers/regulator/regnl.h b/drivers/regulator/regnl.h new file mode 100644 index 000000000000..0b27972bd523 --- /dev/null +++ b/drivers/regulator/regnl.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#ifndef __REGULATOR_EVENT_H +#define __REGULATOR_EVENT_H + +int reg_generate_netlink_event(const char *reg_name, u64 event); + +#endif base-commit: 753e4d5c433da57da75dd4c3e1aececc8e874a62 -- 2.41.0
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