Skip to content

Commit 16e5ac1

Browse files
nsolanki22broonie
nsolanki22
authored and
broonie
committed
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@9elements.com> Link: https://lore.kernel.org/r/20231205105207.1262928-1-naresh.solanki@9elements.com Signed-off-by: Mark Brown <broonie@kernel.org>
1 parent 753e4d5 commit 16e5ac1

File tree

7 files changed

+224
-47
lines changed

7 files changed

+224
-47
lines changed

‎drivers/regulator/Kconfig

Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -56,6 +56,16 @@ config REGULATOR_USERSPACE_CONSUMER
5656

5757
If unsure, say no.
5858

59+
config REGULATOR_NETLINK_EVENTS
60+
bool "Enable support for receiving regulator events via netlink"
61+
depends on NET
62+
help
63+
Enabling this option allows the kernel to broadcast regulator events using
64+
the netlink mechanism. User-space applications can subscribe to these events
65+
for real-time updates on various regulator events.
66+
67+
If unsure, say no.
68+
5969
config REGULATOR_88PG86X
6070
tristate "Marvell 88PG86X voltage regulators"
6171
depends on I2C

‎drivers/regulator/Makefile

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5,6 +5,7 @@
55

66

77
obj-$(CONFIG_REGULATOR) += core.o dummy.o fixed-helper.o helpers.o devres.o irq_helpers.o
8+
obj-$(CONFIG_REGULATOR_NETLINK_EVENTS) += event.o
89
obj-$(CONFIG_OF) += of_regulator.o
910
obj-$(CONFIG_REGULATOR_FIXED_VOLTAGE) += fixed.o
1011
obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o

‎drivers/regulator/core.c

Lines changed: 18 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -33,6 +33,7 @@
3333

3434
#include "dummy.h"
3535
#include "internal.h"
36+
#include "regnl.h"
3637

3738
static DEFINE_WW_CLASS(regulator_ww_class);
3839
static DEFINE_MUTEX(regulator_nesting_mutex);
@@ -4854,7 +4855,23 @@ static int _notifier_call_chain(struct regulator_dev *rdev,
48544855
unsigned long event, void *data)
48554856
{
48564857
/* call rdev chain first */
4857-
return blocking_notifier_call_chain(&rdev->notifier, event, data);
4858+
int ret = blocking_notifier_call_chain(&rdev->notifier, event, data);
4859+
4860+
if (IS_REACHABLE(CONFIG_REGULATOR_NETLINK_EVENTS)) {
4861+
struct device *parent = rdev->dev.parent;
4862+
const char *rname = rdev_get_name(rdev);
4863+
char name[32];
4864+
4865+
/* Avoid duplicate debugfs directory names */
4866+
if (parent && rname == rdev->desc->name) {
4867+
snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
4868+
rname);
4869+
rname = name;
4870+
}
4871+
reg_generate_netlink_event(rname, event);
4872+
}
4873+
4874+
return ret;
48584875
}
48594876

48604877
int _regulator_bulk_get(struct device *dev, int num_consumers,

‎drivers/regulator/event.c

Lines changed: 91 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,91 @@
1+
// SPDX-License-Identifier: GPL-2.0
2+
/*
3+
* Regulator event over netlink
4+
*
5+
* Author: Naresh Solanki <Naresh.Solanki@9elements.com>
6+
*/
7+
8+
#include <regulator/regulator.h>
9+
#include <net/netlink.h>
10+
#include <net/genetlink.h>
11+
12+
#include "regnl.h"
13+
14+
static unsigned int reg_event_seqnum;
15+
16+
static const struct genl_multicast_group reg_event_mcgrps[] = {
17+
{ .name = REG_GENL_MCAST_GROUP_NAME, },
18+
};
19+
20+
static struct genl_family reg_event_genl_family __ro_after_init = {
21+
.module = THIS_MODULE,
22+
.name = REG_GENL_FAMILY_NAME,
23+
.version = REG_GENL_VERSION,
24+
.maxattr = REG_GENL_ATTR_MAX,
25+
.mcgrps = reg_event_mcgrps,
26+
.n_mcgrps = ARRAY_SIZE(reg_event_mcgrps),
27+
};
28+
29+
int reg_generate_netlink_event(const char *reg_name, u64 event)
30+
{
31+
struct sk_buff *skb;
32+
struct nlattr *attr;
33+
struct reg_genl_event *edata;
34+
void *msg_header;
35+
int size;
36+
37+
/* allocate memory */
38+
size = nla_total_size(sizeof(struct reg_genl_event)) +
39+
nla_total_size(0);
40+
41+
skb = genlmsg_new(size, GFP_ATOMIC);
42+
if (!skb)
43+
return -ENOMEM;
44+
45+
/* add the genetlink message header */
46+
msg_header = genlmsg_put(skb, 0, reg_event_seqnum++,
47+
&reg_event_genl_family, 0,
48+
REG_GENL_CMD_EVENT);
49+
if (!msg_header) {
50+
nlmsg_free(skb);
51+
return -ENOMEM;
52+
}
53+
54+
/* fill the data */
55+
attr = nla_reserve(skb, REG_GENL_ATTR_EVENT, sizeof(struct reg_genl_event));
56+
if (!attr) {
57+
nlmsg_free(skb);
58+
return -EINVAL;
59+
}
60+
61+
edata = nla_data(attr);
62+
memset(edata, 0, sizeof(struct reg_genl_event));
63+
64+
strscpy(edata->reg_name, reg_name, sizeof(edata->reg_name));
65+
edata->event = event;
66+
67+
/* send multicast genetlink message */
68+
genlmsg_end(skb, msg_header);
69+
size = genlmsg_multicast(&reg_event_genl_family, skb, 0, 0, GFP_ATOMIC);
70+
71+
return size;
72+
}
73+
74+
static int __init reg_event_genetlink_init(void)
75+
{
76+
return genl_register_family(&reg_event_genl_family);
77+
}
78+
79+
static int __init reg_event_init(void)
80+
{
81+
int error;
82+
83+
/* create genetlink for acpi event */
84+
error = reg_event_genetlink_init();
85+
if (error)
86+
pr_warn("Failed to create genetlink family for reg event\n");
87+
88+
return 0;
89+
}
90+
91+
fs_initcall(reg_event_init);

‎drivers/regulator/regnl.h

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,13 @@
1+
/* SPDX-License-Identifier: GPL-2.0-or-later */
2+
/*
3+
* Regulator event over netlink
4+
*
5+
* Author: Naresh Solanki <Naresh.Solanki@9elements.com>
6+
*/
7+
8+
#ifndef __REGULATOR_EVENT_H
9+
#define __REGULATOR_EVENT_H
10+
11+
int reg_generate_netlink_event(const char *reg_name, u64 event);
12+
13+
#endif

‎include/linux/regulator/consumer.h

Lines changed: 1 addition & 46 deletions
Original file line numberDiff line numberDiff line change
@@ -33,6 +33,7 @@
3333

3434
#include <linux/err.h>
3535
#include <linux/suspend.h>
36+
#include <regulator/regulator.h>
3637

3738
struct device;
3839
struct notifier_block;
@@ -84,52 +85,6 @@ struct regulator_dev;
8485
#define REGULATOR_MODE_IDLE 0x4
8586
#define REGULATOR_MODE_STANDBY 0x8
8687

87-
/*
88-
* Regulator notifier events.
89-
*
90-
* UNDER_VOLTAGE Regulator output is under voltage.
91-
* OVER_CURRENT Regulator output current is too high.
92-
* REGULATION_OUT Regulator output is out of regulation.
93-
* FAIL Regulator output has failed.
94-
* OVER_TEMP Regulator over temp.
95-
* FORCE_DISABLE Regulator forcibly shut down by software.
96-
* VOLTAGE_CHANGE Regulator voltage changed.
97-
* Data passed is old voltage cast to (void *).
98-
* DISABLE Regulator was disabled.
99-
* PRE_VOLTAGE_CHANGE Regulator is about to have voltage changed.
100-
* Data passed is "struct pre_voltage_change_data"
101-
* ABORT_VOLTAGE_CHANGE Regulator voltage change failed for some reason.
102-
* Data passed is old voltage cast to (void *).
103-
* PRE_DISABLE Regulator is about to be disabled
104-
* ABORT_DISABLE Regulator disable failed for some reason
105-
*
106-
* NOTE: These events can be OR'ed together when passed into handler.
107-
*/
108-
109-
#define REGULATOR_EVENT_UNDER_VOLTAGE 0x01
110-
#define REGULATOR_EVENT_OVER_CURRENT 0x02
111-
#define REGULATOR_EVENT_REGULATION_OUT 0x04
112-
#define REGULATOR_EVENT_FAIL 0x08
113-
#define REGULATOR_EVENT_OVER_TEMP 0x10
114-
#define REGULATOR_EVENT_FORCE_DISABLE 0x20
115-
#define REGULATOR_EVENT_VOLTAGE_CHANGE 0x40
116-
#define REGULATOR_EVENT_DISABLE 0x80
117-
#define REGULATOR_EVENT_PRE_VOLTAGE_CHANGE 0x100
118-
#define REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE 0x200
119-
#define REGULATOR_EVENT_PRE_DISABLE 0x400
120-
#define REGULATOR_EVENT_ABORT_DISABLE 0x800
121-
#define REGULATOR_EVENT_ENABLE 0x1000
122-
/*
123-
* Following notifications should be emitted only if detected condition
124-
* is such that the HW is likely to still be working but consumers should
125-
* take a recovery action to prevent problems esacalating into errors.
126-
*/
127-
#define REGULATOR_EVENT_UNDER_VOLTAGE_WARN 0x2000
128-
#define REGULATOR_EVENT_OVER_CURRENT_WARN 0x4000
129-
#define REGULATOR_EVENT_OVER_VOLTAGE_WARN 0x8000
130-
#define REGULATOR_EVENT_OVER_TEMP_WARN 0x10000
131-
#define REGULATOR_EVENT_WARN_MASK 0x1E000
132-
13388
/*
13489
* Regulator errors that can be queried using regulator_get_error_flags
13590
*

‎include/uapi/regulator/regulator.h

Lines changed: 90 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,90 @@
1+
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2+
/*
3+
* Regulator uapi header
4+
*
5+
* Author: Naresh Solanki <Naresh.Solanki@9elements.com>
6+
*/
7+
8+
#ifndef _UAPI_REGULATOR_H
9+
#define _UAPI_REGULATOR_H
10+
11+
#ifdef __KERNEL__
12+
#include <linux/types.h>
13+
#else
14+
#include <stdint.h>
15+
#endif
16+
17+
/*
18+
* Regulator notifier events.
19+
*
20+
* UNDER_VOLTAGE Regulator output is under voltage.
21+
* OVER_CURRENT Regulator output current is too high.
22+
* REGULATION_OUT Regulator output is out of regulation.
23+
* FAIL Regulator output has failed.
24+
* OVER_TEMP Regulator over temp.
25+
* FORCE_DISABLE Regulator forcibly shut down by software.
26+
* VOLTAGE_CHANGE Regulator voltage changed.
27+
* Data passed is old voltage cast to (void *).
28+
* DISABLE Regulator was disabled.
29+
* PRE_VOLTAGE_CHANGE Regulator is about to have voltage changed.
30+
* Data passed is "struct pre_voltage_change_data"
31+
* ABORT_VOLTAGE_CHANGE Regulator voltage change failed for some reason.
32+
* Data passed is old voltage cast to (void *).
33+
* PRE_DISABLE Regulator is about to be disabled
34+
* ABORT_DISABLE Regulator disable failed for some reason
35+
*
36+
* NOTE: These events can be OR'ed together when passed into handler.
37+
*/
38+
39+
#define REGULATOR_EVENT_UNDER_VOLTAGE 0x01
40+
#define REGULATOR_EVENT_OVER_CURRENT 0x02
41+
#define REGULATOR_EVENT_REGULATION_OUT 0x04
42+
#define REGULATOR_EVENT_FAIL 0x08
43+
#define REGULATOR_EVENT_OVER_TEMP 0x10
44+
#define REGULATOR_EVENT_FORCE_DISABLE 0x20
45+
#define REGULATOR_EVENT_VOLTAGE_CHANGE 0x40
46+
#define REGULATOR_EVENT_DISABLE 0x80
47+
#define REGULATOR_EVENT_PRE_VOLTAGE_CHANGE 0x100
48+
#define REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE 0x200
49+
#define REGULATOR_EVENT_PRE_DISABLE 0x400
50+
#define REGULATOR_EVENT_ABORT_DISABLE 0x800
51+
#define REGULATOR_EVENT_ENABLE 0x1000
52+
/*
53+
* Following notifications should be emitted only if detected condition
54+
* is such that the HW is likely to still be working but consumers should
55+
* take a recovery action to prevent problems esacalating into errors.
56+
*/
57+
#define REGULATOR_EVENT_UNDER_VOLTAGE_WARN 0x2000
58+
#define REGULATOR_EVENT_OVER_CURRENT_WARN 0x4000
59+
#define REGULATOR_EVENT_OVER_VOLTAGE_WARN 0x8000
60+
#define REGULATOR_EVENT_OVER_TEMP_WARN 0x10000
61+
#define REGULATOR_EVENT_WARN_MASK 0x1E000
62+
63+
struct reg_genl_event {
64+
char reg_name[32];
65+
uint64_t event;
66+
};
67+
68+
/* attributes of reg_genl_family */
69+
enum {
70+
REG_GENL_ATTR_UNSPEC,
71+
REG_GENL_ATTR_EVENT, /* reg event info needed by user space */
72+
__REG_GENL_ATTR_MAX,
73+
};
74+
75+
#define REG_GENL_ATTR_MAX (__REG_GENL_ATTR_MAX - 1)
76+
77+
/* commands supported by the reg_genl_family */
78+
enum {
79+
REG_GENL_CMD_UNSPEC,
80+
REG_GENL_CMD_EVENT, /* kernel->user notifications for reg events */
81+
__REG_GENL_CMD_MAX,
82+
};
83+
84+
#define REG_GENL_CMD_MAX (__REG_GENL_CMD_MAX - 1)
85+
86+
#define REG_GENL_FAMILY_NAME "reg_event"
87+
#define REG_GENL_VERSION 0x01
88+
#define REG_GENL_MCAST_GROUP_NAME "reg_mc_group"
89+
90+
#endif /* _UAPI_REGULATOR_H */

0 commit comments

Comments
 (0)