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Message-ID: <20231121101331.22837-1-naresh.solanki@9elements.com>
Date: Tue, 21 Nov 2023 10:13:30 +0000
From: Naresh Solanki <naresh.solanki@...ements.com>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
Cc: Naresh Solanki <naresh.solanki@...ements.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] regulator: event: Add regulator netlink event support
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@...ements.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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