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Message-Id: <57bc509273bf288d74835e6ebdaebf27b4991888.1608935587.git.vilhelm.gray@gmail.com>
Date: Fri, 25 Dec 2020 19:15:36 -0500
From: William Breathitt Gray <vilhelm.gray@...il.com>
To: jic23@...nel.org
Cc: kernel@...gutronix.de, linux-stm32@...md-mailman.stormreply.com,
a.fatoum@...gutronix.de, kamel.bouhara@...tlin.com,
gwendal@...omium.org, alexandre.belloni@...tlin.com,
david@...hnology.com, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
syednwaris@...il.com, patrick.havelange@...ensium.com,
fabrice.gasnier@...com, mcoquelin.stm32@...il.com,
alexandre.torgue@...com,
William Breathitt Gray <vilhelm.gray@...il.com>,
Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH v7 3/5] counter: Add character device interface
This patch introduces a character device interface for the Counter
subsystem. Device data is exposed through standard character device read
operations. Device data is gathered when a Counter event is pushed by
the respective Counter device driver. Configuration is handled via ioctl
operations on the respective Counter character device node.
Cc: David Lechner <david@...hnology.com>
Cc: Gwendal Grignou <gwendal@...omium.org>
Cc: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
MAINTAINERS | 1 +
drivers/counter/Makefile | 2 +-
drivers/counter/counter-chrdev.c | 490 +++++++++++++++++++++++++++++++
drivers/counter/counter-chrdev.h | 16 +
drivers/counter/counter-core.c | 37 ++-
drivers/counter/counter-sysfs.c | 51 +++-
include/linux/counter.h | 87 +++---
include/uapi/linux/counter.h | 123 ++++++++
8 files changed, 751 insertions(+), 56 deletions(-)
create mode 100644 drivers/counter/counter-chrdev.c
create mode 100644 drivers/counter/counter-chrdev.h
create mode 100644 include/uapi/linux/counter.h
diff --git a/MAINTAINERS b/MAINTAINERS
index b64fa49d5796..3a240f70bdd4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4494,6 +4494,7 @@ F: Documentation/ABI/testing/sysfs-bus-counter*
F: Documentation/driver-api/generic-counter.rst
F: drivers/counter/
F: include/linux/counter.h
+F: include/uapi/linux/counter.h
CPMAC ETHERNET DRIVER
M: Florian Fainelli <f.fainelli@...il.com>
diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile
index cbe1d06af6a9..c4870eb5b1dd 100644
--- a/drivers/counter/Makefile
+++ b/drivers/counter/Makefile
@@ -4,7 +4,7 @@
#
obj-$(CONFIG_COUNTER) += counter.o
-counter-y := counter-core.o counter-sysfs.o
+counter-y := counter-core.o counter-sysfs.o counter-chrdev.o
obj-$(CONFIG_104_QUAD_8) += 104-quad-8.o
obj-$(CONFIG_STM32_TIMER_CNT) += stm32-timer-cnt.o
diff --git a/drivers/counter/counter-chrdev.c b/drivers/counter/counter-chrdev.c
new file mode 100644
index 000000000000..61b11989546a
--- /dev/null
+++ b/drivers/counter/counter-chrdev.c
@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Generic Counter character device interface
+ * Copyright (C) 2020 William Breathitt Gray
+ */
+
+#include <linux/cdev.h>
+#include <linux/counter.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/fs.h>
+#include <linux/kdev_t.h>
+#include <linux/kfifo.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/nospec.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/timekeeping.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/uaccess.h>
+
+#include "counter-chrdev.h"
+
+struct counter_comp_node {
+ struct list_head l;
+ struct counter_component component;
+ struct counter_comp comp;
+ void *parent;
+};
+
+static ssize_t counter_chrdev_read(struct file *filp, char __user *buf,
+ size_t len, loff_t *f_ps)
+{
+ struct counter_device *const counter = filp->private_data;
+ int err;
+ unsigned int copied;
+
+ if (len < sizeof(struct counter_event))
+ return -EINVAL;
+
+ do {
+ if (kfifo_is_empty(&counter->events)) {
+ if (filp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ err = wait_event_interruptible(counter->events_wait,
+ !kfifo_is_empty(&counter->events));
+ if (err < 0)
+ return err;
+ }
+
+ if (mutex_lock_interruptible(&counter->events_lock))
+ return -ERESTARTSYS;
+ err = kfifo_to_user(&counter->events, buf, len, &copied);
+ mutex_unlock(&counter->events_lock);
+ if (err < 0)
+ return err;
+ } while (!copied);
+
+ return copied;
+}
+
+static __poll_t counter_chrdev_poll(struct file *filp,
+ struct poll_table_struct *pollt)
+{
+ struct counter_device *const counter = filp->private_data;
+ __poll_t events = 0;
+
+ poll_wait(filp, &counter->events_wait, pollt);
+
+ if (!kfifo_is_empty(&counter->events))
+ events = EPOLLIN | EPOLLRDNORM;
+
+ return events;
+}
+
+static void counter_events_list_free(struct list_head *const events_list)
+{
+ struct counter_event_node *p, *n;
+ struct counter_comp_node *q, *o;
+
+ list_for_each_entry_safe(p, n, events_list, l) {
+ /* Free associated component nodes */
+ list_for_each_entry_safe(q, o, &p->comp_list, l) {
+ list_del(&q->l);
+ kfree(q);
+ }
+
+ /* Free event node */
+ list_del(&p->l);
+ kfree(p);
+ }
+}
+
+static int counter_set_event_node(struct counter_device *const counter,
+ struct counter_watch *const watch,
+ const struct counter_comp_node *const cfg)
+{
+ struct counter_event_node *event_node;
+ struct counter_comp_node *comp_node;
+
+ /* Search for event in the list */
+ list_for_each_entry(event_node, &counter->next_events_list, l)
+ if (event_node->event == watch->event &&
+ event_node->channel == watch->channel)
+ break;
+
+ /* If event is not already in the list */
+ if (&event_node->l == &counter->next_events_list) {
+ /* Allocate new event node */
+ event_node = kmalloc(sizeof(*event_node), GFP_ATOMIC);
+ if (!event_node)
+ return -ENOMEM;
+
+ /* Configure event node and add to the list */
+ event_node->event = watch->event;
+ event_node->channel = watch->channel;
+ INIT_LIST_HEAD(&event_node->comp_list);
+ list_add(&event_node->l, &counter->next_events_list);
+ }
+
+ /* Check if component watch has already been set before */
+ list_for_each_entry(comp_node, &event_node->comp_list, l)
+ if (comp_node->parent == cfg->parent &&
+ comp_node->comp.count_u8_read == cfg->comp.count_u8_read)
+ return -EINVAL;
+
+ /* Allocate component node */
+ comp_node = kmalloc(sizeof(*comp_node), GFP_ATOMIC);
+ if (!comp_node) {
+ /* Free event node if no one else is watching */
+ if (list_empty(&event_node->comp_list)) {
+ list_del(&event_node->l);
+ kfree(event_node);
+ }
+ return -ENOMEM;
+ }
+ *comp_node = *cfg;
+
+ /* Add component node to event node */
+ list_add_tail(&comp_node->l, &event_node->comp_list);
+
+ return 0;
+}
+
+static int counter_clear_watches(struct counter_device *const counter)
+{
+ unsigned long flags;
+ int err = 0;
+
+ raw_spin_lock_irqsave(&counter->events_list_lock, flags);
+
+ counter_events_list_free(&counter->events_list);
+
+ if (counter->ops->events_configure)
+ err = counter->ops->events_configure(counter);
+
+ raw_spin_unlock_irqrestore(&counter->events_list_lock, flags);
+
+ counter_events_list_free(&counter->next_events_list);
+
+ return err;
+}
+
+static int counter_add_watch(struct counter_device *const counter,
+ const unsigned long arg)
+{
+ void __user *const uwatch = (void __user *)arg;
+ struct counter_watch watch;
+ struct counter_comp_node comp_node = {0};
+ size_t parent, id;
+ struct counter_comp *ext;
+ size_t num_ext;
+ int err;
+
+ if (copy_from_user(&watch, uwatch, sizeof(watch)))
+ return -EFAULT;
+
+ if (watch.component.type == COUNTER_COMPONENT_NONE)
+ goto no_component;
+
+ parent = watch.component.parent;
+
+ /* Configure parent component info for comp node */
+ switch (watch.component.scope) {
+ case COUNTER_SCOPE_DEVICE:
+ ext = counter->ext;
+ num_ext = counter->num_ext;
+ break;
+ case COUNTER_SCOPE_SIGNAL:
+ if (parent >= counter->num_signals)
+ return -EINVAL;
+ parent = array_index_nospec(parent, counter->num_signals);
+
+ comp_node.parent = counter->signals + parent;
+
+ ext = counter->signals[parent].ext;
+ num_ext = counter->signals[parent].num_ext;
+ break;
+ case COUNTER_SCOPE_COUNT:
+ if (parent >= counter->num_counts)
+ return -EINVAL;
+ parent = array_index_nospec(parent, counter->num_counts);
+
+ comp_node.parent = counter->counts + parent;
+
+ ext = counter->counts[parent].ext;
+ num_ext = counter->counts[parent].num_ext;
+ break;
+ }
+
+ id = watch.component.id;
+
+ /* Configure component info for comp node */
+ switch (watch.component.type) {
+ case COUNTER_COMPONENT_SIGNAL:
+ if (watch.component.scope != COUNTER_SCOPE_SIGNAL)
+ return -EINVAL;
+
+ comp_node.comp.type = COUNTER_COMP_SIGNAL_LEVEL;
+ comp_node.comp.signal_u32_read = counter->ops->signal_read;
+ break;
+ case COUNTER_COMPONENT_COUNT:
+ if (watch.component.scope != COUNTER_SCOPE_COUNT)
+ return -EINVAL;
+
+ comp_node.comp.type = COUNTER_COMP_U64;
+ comp_node.comp.count_u64_read = counter->ops->count_read;
+ break;
+ case COUNTER_COMPONENT_FUNCTION:
+ if (watch.component.scope != COUNTER_SCOPE_COUNT)
+ return -EINVAL;
+
+ comp_node.comp.type = COUNTER_COMP_FUNCTION;
+ comp_node.comp.count_u32_read = counter->ops->function_read;
+ break;
+ case COUNTER_COMPONENT_SYNAPSE_ACTION:
+ if (watch.component.scope != COUNTER_SCOPE_COUNT)
+ return -EINVAL;
+ if (id >= counter->counts[parent].num_synapses)
+ return -EINVAL;
+ id = array_index_nospec(id, counter->counts[parent].num_synapses);
+
+ comp_node.comp.type = COUNTER_COMP_SYNAPSE_ACTION;
+ comp_node.comp.action_read = counter->ops->action_read;
+ comp_node.comp.priv = counter->counts[parent].synapses + id;
+ break;
+ case COUNTER_COMPONENT_EXTENSION:
+ if (id >= num_ext)
+ return -EINVAL;
+ id = array_index_nospec(id, num_ext);
+
+ comp_node.comp = ext[id];
+ break;
+ default:
+ return -EINVAL;
+ }
+ /* Check if any read callback is set; this is part of a union */
+ if (!comp_node.comp.count_u8_read)
+ return -EOPNOTSUPP;
+
+no_component:
+ if (counter->ops->watch_validate) {
+ err = counter->ops->watch_validate(counter, &watch);
+ if (err < 0)
+ return err;
+ }
+
+ comp_node.component = watch.component;
+
+ return counter_set_event_node(counter, &watch, &comp_node);
+}
+
+static long counter_chrdev_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ struct counter_device *const counter = filp->private_data;
+ unsigned long flags;
+ int err = 0;
+
+ switch (cmd) {
+ case COUNTER_CLEAR_WATCHES_IOCTL:
+ return counter_clear_watches(counter);
+ case COUNTER_ADD_WATCH_IOCTL:
+ return counter_add_watch(counter, arg);
+ case COUNTER_LOAD_WATCHES_IOCTL:
+ raw_spin_lock_irqsave(&counter->events_list_lock, flags);
+
+ counter_events_list_free(&counter->events_list);
+ list_replace_init(&counter->next_events_list,
+ &counter->events_list);
+
+ if (counter->ops->events_configure)
+ err = counter->ops->events_configure(counter);
+
+ raw_spin_unlock_irqrestore(&counter->events_list_lock, flags);
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+
+ return err;
+}
+
+static int counter_chrdev_open(struct inode *inode, struct file *filp)
+{
+ struct counter_device *const counter = container_of(inode->i_cdev,
+ typeof(*counter),
+ chrdev);
+
+ get_device(&counter->dev);
+ filp->private_data = counter;
+
+ return nonseekable_open(inode, filp);
+}
+
+static int counter_chrdev_release(struct inode *inode, struct file *filp)
+{
+ struct counter_device *const counter = filp->private_data;
+ int err;
+
+ err = counter_clear_watches(counter);
+ if (err < 0)
+ return err;
+
+ put_device(&counter->dev);
+
+ return 0;
+}
+
+static const struct file_operations counter_fops = {
+ .llseek = no_llseek,
+ .read = counter_chrdev_read,
+ .poll = counter_chrdev_poll,
+ .unlocked_ioctl = counter_chrdev_ioctl,
+ .open = counter_chrdev_open,
+ .release = counter_chrdev_release,
+};
+
+int counter_chrdev_add(struct counter_device *const counter,
+ const dev_t counter_devt)
+{
+ struct device *const dev = &counter->dev;
+ struct cdev *const chrdev = &counter->chrdev;
+
+ /* Initialize Counter events lists */
+ INIT_LIST_HEAD(&counter->events_list);
+ INIT_LIST_HEAD(&counter->next_events_list);
+ raw_spin_lock_init(&counter->events_list_lock);
+
+ /* Initialize Counter events queue */
+ INIT_KFIFO(counter->events);
+ init_waitqueue_head(&counter->events_wait);
+ mutex_init(&counter->events_lock);
+
+ /* Initialize character device */
+ cdev_init(chrdev, &counter_fops);
+ dev->devt = MKDEV(MAJOR(counter_devt), counter->id);
+ cdev_set_parent(chrdev, &dev->kobj);
+
+ return cdev_add(chrdev, dev->devt, 1);
+}
+
+void counter_chrdev_remove(struct counter_device *const counter)
+{
+ cdev_del(&counter->chrdev);
+}
+
+static int counter_get_data(struct counter_device *const counter,
+ const struct counter_comp_node *const comp_node,
+ u64 *const value)
+{
+ const struct counter_comp *const comp = &comp_node->comp;
+ void *const parent = comp_node->parent;
+ int err = 0;
+ u8 value_u8 = 0;
+ u32 value_u32 = 0;
+
+ if (comp_node->component.type == COUNTER_COMPONENT_NONE)
+ return 0;
+
+ switch (comp->type) {
+ case COUNTER_COMP_U8:
+ case COUNTER_COMP_BOOL:
+ switch (comp_node->component.scope) {
+ case COUNTER_SCOPE_DEVICE:
+ err = comp->device_u8_read(counter, &value_u8);
+ break;
+ case COUNTER_SCOPE_SIGNAL:
+ err = comp->signal_u8_read(counter, parent, &value_u8);
+ break;
+ case COUNTER_SCOPE_COUNT:
+ err = comp->count_u8_read(counter, parent, &value_u8);
+ break;
+ }
+ *value = value_u8;
+ break;
+ case COUNTER_COMP_SIGNAL_LEVEL:
+ case COUNTER_COMP_FUNCTION:
+ case COUNTER_COMP_ENUM:
+ case COUNTER_COMP_COUNT_DIRECTION:
+ case COUNTER_COMP_COUNT_MODE:
+ switch (comp_node->component.scope) {
+ case COUNTER_SCOPE_DEVICE:
+ err = comp->device_u32_read(counter, &value_u32);
+ break;
+ case COUNTER_SCOPE_SIGNAL:
+ err = comp->signal_u32_read(counter, parent,
+ &value_u32);
+ break;
+ case COUNTER_SCOPE_COUNT:
+ err = comp->count_u32_read(counter, parent, &value_u32);
+ break;
+ }
+ *value = value_u32;
+ break;
+ case COUNTER_COMP_U64:
+ switch (comp_node->component.scope) {
+ case COUNTER_SCOPE_DEVICE:
+ return comp->device_u64_read(counter, value);
+ case COUNTER_SCOPE_SIGNAL:
+ return comp->signal_u64_read(counter, parent, value);
+ case COUNTER_SCOPE_COUNT:
+ return comp->count_u64_read(counter, parent, value);
+ }
+ break;
+ case COUNTER_COMP_SYNAPSE_ACTION:
+ err = comp->action_read(counter, parent, comp->priv,
+ &value_u32);
+ *value = value_u32;
+ break;
+ }
+
+ return err;
+}
+
+/**
+ * counter_push_event - queue event for userspace reading
+ * @counter: pointer to Counter structure
+ * @event: triggered event
+ * @channel: event channel
+ *
+ * Note: If no one is watching for the respective event, it is silently
+ * discarded.
+ */
+void counter_push_event(struct counter_device *const counter, const u8 event,
+ const u8 channel)
+{
+ struct counter_event ev = {0};
+ unsigned int copied = 0;
+ unsigned long flags;
+ struct counter_event_node *event_node;
+ struct counter_comp_node *comp_node;
+
+ ev.timestamp = ktime_get_ns();
+ ev.watch.event = event;
+ ev.watch.channel = channel;
+
+ raw_spin_lock_irqsave(&counter->events_list_lock, flags);
+
+ /* Search for event in the list */
+ list_for_each_entry(event_node, &counter->events_list, l)
+ if (event_node->event == event &&
+ event_node->channel == channel)
+ break;
+
+ /* If event is not in the list */
+ if (&event_node->l == &counter->events_list)
+ goto exit_early;
+
+ /* Read and queue relevant comp for userspace */
+ list_for_each_entry(comp_node, &event_node->comp_list, l) {
+ ev.watch.component = comp_node->component;
+ ev.errno = -counter_get_data(counter, comp_node, &ev.value);
+
+ copied += kfifo_put(&counter->events, ev);
+ }
+
+ if (copied)
+ wake_up_poll(&counter->events_wait, EPOLLIN);
+
+exit_early:
+ raw_spin_unlock_irqrestore(&counter->events_list_lock, flags);
+}
+EXPORT_SYMBOL_GPL(counter_push_event);
diff --git a/drivers/counter/counter-chrdev.h b/drivers/counter/counter-chrdev.h
new file mode 100644
index 000000000000..cf5a318fe540
--- /dev/null
+++ b/drivers/counter/counter-chrdev.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Counter character device interface
+ * Copyright (C) 2020 William Breathitt Gray
+ */
+#ifndef _COUNTER_CHRDEV_H_
+#define _COUNTER_CHRDEV_H_
+
+#include <linux/counter.h>
+#include <linux/types.h>
+
+int counter_chrdev_add(struct counter_device *const counter,
+ const dev_t counter_devt);
+void counter_chrdev_remove(struct counter_device *const counter);
+
+#endif /* _COUNTER_CHRDEV_H_ */
diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
index 78e07588717b..1334e2f4ce4e 100644
--- a/drivers/counter/counter-core.c
+++ b/drivers/counter/counter-core.c
@@ -5,12 +5,16 @@
*/
#include <linux/counter.h>
#include <linux/device.h>
+#include <linux/device/bus.h>
#include <linux/export.h>
+#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/idr.h>
#include <linux/init.h>
#include <linux/module.h>
+#include <linux/types.h>
+#include "counter-chrdev.h"
#include "counter-sysfs.h"
/* Provides a unique ID for each counter device */
@@ -33,6 +37,8 @@ static struct bus_type counter_bus_type = {
.name = "counter"
};
+static dev_t counter_devt;
+
/**
* counter_register - register Counter to the system
* @counter: pointer to Counter to register
@@ -51,7 +57,6 @@ int counter_register(struct counter_device *const counter)
if (counter->id < 0)
return counter->id;
- /* Configure device structure for Counter */
dev->type = &counter_device_type;
dev->bus = &counter_bus_type;
if (counter->parent) {
@@ -62,18 +67,25 @@ int counter_register(struct counter_device *const counter)
device_initialize(dev);
dev_set_drvdata(dev, counter);
+ /* Add Counter character device */
+ err = counter_chrdev_add(counter, counter_devt);
+ if (err)
+ goto err_free_id;
+
/* Add Counter sysfs attributes */
err = counter_sysfs_add(counter);
if (err < 0)
- goto err_free_id;
+ goto err_remove_chrdev;
/* Add device to system */
err = device_add(dev);
if (err < 0)
- goto err_free_id;
+ goto err_remove_chrdev;
return 0;
+err_remove_chrdev:
+ counter_chrdev_remove(counter);
err_free_id:
put_device(dev);
return err;
@@ -135,13 +147,30 @@ int devm_counter_register(struct device *dev,
}
EXPORT_SYMBOL_GPL(devm_counter_register);
+#define COUNTER_DEV_MAX 256
+
static int __init counter_init(void)
{
- return bus_register(&counter_bus_type);
+ int err;
+
+ err = bus_register(&counter_bus_type);
+ if (err < 0)
+ return err;
+
+ err = alloc_chrdev_region(&counter_devt, 0, COUNTER_DEV_MAX, "counter");
+ if (err < 0)
+ goto err_unregister_bus;
+
+ return 0;
+
+err_unregister_bus:
+ bus_unregister(&counter_bus_type);
+ return err;
}
static void __exit counter_exit(void)
{
+ unregister_chrdev_region(counter_devt, COUNTER_DEV_MAX);
bus_unregister(&counter_bus_type);
}
diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c
index 654afa91ae9f..4d97d6e50d48 100644
--- a/drivers/counter/counter-sysfs.c
+++ b/drivers/counter/counter-sysfs.c
@@ -499,6 +499,7 @@ static ssize_t counter_comp_name_show(struct device *dev,
static int counter_name_attr_create(struct device *const dev,
struct counter_attribute_group *const group,
+ const char *const attr_name,
const char *const name)
{
struct counter_attribute *counter_attr;
@@ -513,7 +514,7 @@ static int counter_name_attr_create(struct device *const dev,
/* Configure device attribute */
sysfs_attr_init(&counter_attr->dev_attr.attr);
- counter_attr->dev_attr.attr.name = "name";
+ counter_attr->dev_attr.attr.name = attr_name;
counter_attr->dev_attr.attr.mode = 0444;
counter_attr->dev_attr.show = counter_comp_name_show;
@@ -524,6 +525,18 @@ static int counter_name_attr_create(struct device *const dev,
return 0;
}
+static int counter_ext_name_attr_create(struct device *const dev,
+ struct counter_attribute_group *const group, const size_t i,
+ const char *const name)
+{
+ const char *attr_name;
+
+ attr_name = devm_kasprintf(dev, GFP_KERNEL, "extension%zu_name", i);
+ if (!attr_name)
+ return -ENOMEM;
+
+ return counter_name_attr_create(dev, group, attr_name, name);
+}
static struct counter_comp counter_signal_comp = {
.type = COUNTER_COMP_SIGNAL_LEVEL,
@@ -539,6 +552,7 @@ static int counter_signal_attrs_create(struct counter_device *const counter,
int err;
struct counter_comp comp;
size_t i;
+ struct counter_comp *ext;
/* Create main Signal attribute */
comp = counter_signal_comp;
@@ -548,14 +562,19 @@ static int counter_signal_attrs_create(struct counter_device *const counter,
return err;
/* Create Signal name attribute */
- err = counter_name_attr_create(dev, group, signal->name);
+ err = counter_name_attr_create(dev, group, "name", signal->name);
if (err < 0)
return err;
/* Create an attribute for each extension */
for (i = 0; i < signal->num_ext; i++) {
- err = counter_attr_create(dev, group, signal->ext + i, scope,
- signal);
+ ext = signal->ext + i;
+
+ err = counter_attr_create(dev, group, ext, scope, signal);
+ if (err < 0)
+ return err;
+
+ err = counter_ext_name_attr_create(dev, group, i, ext->name);
if (err < 0)
return err;
}
@@ -640,6 +659,7 @@ static int counter_count_attrs_create(struct counter_device *const counter,
int err;
struct counter_comp comp;
size_t i;
+ struct counter_comp *ext;
/* Create main Count attribute */
comp = counter_count_comp;
@@ -650,7 +670,7 @@ static int counter_count_attrs_create(struct counter_device *const counter,
return err;
/* Create Count name attribute */
- err = counter_name_attr_create(dev, group, count->name);
+ err = counter_name_attr_create(dev, group, "name", count->name);
if (err < 0)
return err;
@@ -664,8 +684,13 @@ static int counter_count_attrs_create(struct counter_device *const counter,
/* Create an attribute for each extension */
for (i = 0; i < count->num_ext; i++) {
- err = counter_attr_create(dev, group, count->ext + i, scope,
- count);
+ ext = count->ext + i;
+
+ err = counter_attr_create(dev, group, ext, scope, count);
+ if (err < 0)
+ return err;
+
+ err = counter_ext_name_attr_create(dev, group, i, ext->name);
if (err < 0)
return err;
}
@@ -729,6 +754,7 @@ static int counter_sysfs_attr_add(struct counter_device *const counter,
struct device *const dev = &counter->dev;
int err;
size_t i;
+ struct counter_comp *ext;
/* Add Signals sysfs attributes */
err = counter_sysfs_signals_add(counter, group);
@@ -743,7 +769,7 @@ static int counter_sysfs_attr_add(struct counter_device *const counter,
group += counter->num_counts;
/* Create name attribute */
- err = counter_name_attr_create(dev, group, counter->name);
+ err = counter_name_attr_create(dev, group, "name", counter->name);
if (err < 0)
return err;
@@ -761,8 +787,13 @@ static int counter_sysfs_attr_add(struct counter_device *const counter,
/* Create an attribute for each extension */
for (i = 0; i < counter->num_ext; i++) {
- err = counter_attr_create(dev, group, counter->ext + i, scope,
- NULL);
+ ext = counter->ext + i;
+
+ err = counter_attr_create(dev, group, ext, scope, NULL);
+ if (err < 0)
+ return err;
+
+ err = counter_ext_name_attr_create(dev, group, i, ext->name);
if (err < 0)
return err;
}
diff --git a/include/linux/counter.h b/include/linux/counter.h
index 2f01e1fec857..ce79e62a2e58 100644
--- a/include/linux/counter.h
+++ b/include/linux/counter.h
@@ -6,9 +6,15 @@
#ifndef _COUNTER_H_
#define _COUNTER_H_
+#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/kernel.h>
+#include <linux/kfifo.h>
+#include <linux/mutex.h>
+#include <linux/spinlock_types.h>
#include <linux/types.h>
+#include <linux/wait.h>
+#include <uapi/linux/counter.h>
struct counter_device;
struct counter_count;
@@ -27,47 +33,6 @@ enum counter_comp_type {
COUNTER_COMP_COUNT_MODE,
};
-enum counter_scope {
- COUNTER_SCOPE_DEVICE,
- COUNTER_SCOPE_SIGNAL,
- COUNTER_SCOPE_COUNT,
-};
-
-enum counter_count_direction {
- COUNTER_COUNT_DIRECTION_FORWARD,
- COUNTER_COUNT_DIRECTION_BACKWARD,
-};
-
-enum counter_count_mode {
- COUNTER_COUNT_MODE_NORMAL,
- COUNTER_COUNT_MODE_RANGE_LIMIT,
- COUNTER_COUNT_MODE_NON_RECYCLE,
- COUNTER_COUNT_MODE_MODULO_N,
-};
-
-enum counter_function {
- COUNTER_FUNCTION_INCREASE,
- COUNTER_FUNCTION_DECREASE,
- COUNTER_FUNCTION_PULSE_DIRECTION,
- COUNTER_FUNCTION_QUADRATURE_X1_A,
- COUNTER_FUNCTION_QUADRATURE_X1_B,
- COUNTER_FUNCTION_QUADRATURE_X2_A,
- COUNTER_FUNCTION_QUADRATURE_X2_B,
- COUNTER_FUNCTION_QUADRATURE_X4,
-};
-
-enum counter_signal_level {
- COUNTER_SIGNAL_LEVEL_LOW,
- COUNTER_SIGNAL_LEVEL_HIGH,
-};
-
-enum counter_synapse_action {
- COUNTER_SYNAPSE_ACTION_NONE,
- COUNTER_SYNAPSE_ACTION_RISING_EDGE,
- COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
- COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
-};
-
/**
* struct counter_comp - Counter component node
* @type: Counter component data type
@@ -239,6 +204,20 @@ struct counter_count {
size_t num_ext;
};
+/**
+ * struct counter_event_node - Counter Event node
+ * @l: list of current watching Counter events
+ * @event: event that triggers
+ * @channel: event channel
+ * @comp_list: list of components to watch when event triggers
+ */
+struct counter_event_node {
+ struct list_head l;
+ u8 event;
+ u8 channel;
+ struct list_head comp_list;
+};
+
/**
* struct counter_ops - Callbacks from driver
* @signal_read: read callback for Signals. The read level of the
@@ -261,6 +240,13 @@ struct counter_count {
* @action_write: write callback for Synapse action modes. The action mode
* to write for the respective Synapse is passed in via the
* action parameter.
+ * @events_configure: write callback to configure events. The list of struct
+ * counter_event_node may be accessed via the events_list
+ * member of the counter parameter.
+ * @watch_validate: callback to validate a watch. The Counter component
+ * watch configuration is passed in via the watch
+ * parameter. A return value of 0 indicates a valid Counter
+ * component watch configuration.
*/
struct counter_ops {
int (*signal_read)(struct counter_device *counter,
@@ -284,6 +270,9 @@ struct counter_ops {
struct counter_count *count,
struct counter_synapse *synapse,
enum counter_synapse_action action);
+ int (*events_configure)(struct counter_device *counter);
+ int (*watch_validate)(struct counter_device *counter,
+ const struct counter_watch *watch);
};
/**
@@ -300,6 +289,13 @@ struct counter_ops {
* @priv: optional private data supplied by driver
* @id: unique ID used to identify the Counter
* @dev: internal device structure
+ * @chrdev: internal character device structure
+ * @events_list: list of current watching Counter events
+ * @events_list_lock: lock to protect Counter events list operations
+ * @next_events_list: list of next watching Counter events
+ * @events: queue of detected Counter events
+ * @events_wait: wait queue to allow blocking reads of Counter events
+ * @events_lock: lock to protect Counter events queue read operations
*/
struct counter_device {
const char *name;
@@ -319,12 +315,21 @@ struct counter_device {
int id;
struct device dev;
+ struct cdev chrdev;
+ struct list_head events_list;
+ raw_spinlock_t events_list_lock;
+ struct list_head next_events_list;
+ DECLARE_KFIFO(events, struct counter_event, 64);
+ wait_queue_head_t events_wait;
+ struct mutex events_lock;
};
int counter_register(struct counter_device *const counter);
void counter_unregister(struct counter_device *const counter);
int devm_counter_register(struct device *dev,
struct counter_device *const counter);
+void counter_push_event(struct counter_device *const counter, const u8 event,
+ const u8 channel);
#define COUNTER_COMP_DEVICE_U8(_name, _read, _write) \
{ \
diff --git a/include/uapi/linux/counter.h b/include/uapi/linux/counter.h
new file mode 100644
index 000000000000..7585dc9db19d
--- /dev/null
+++ b/include/uapi/linux/counter.h
@@ -0,0 +1,123 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Userspace ABI for Counter character devices
+ * Copyright (C) 2020 William Breathitt Gray
+ */
+#ifndef _UAPI_COUNTER_H_
+#define _UAPI_COUNTER_H_
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+/* Component type definitions */
+enum counter_component_type {
+ COUNTER_COMPONENT_NONE,
+ COUNTER_COMPONENT_SIGNAL,
+ COUNTER_COMPONENT_COUNT,
+ COUNTER_COMPONENT_FUNCTION,
+ COUNTER_COMPONENT_SYNAPSE_ACTION,
+ COUNTER_COMPONENT_EXTENSION,
+};
+
+/* Component scope definitions */
+enum counter_scope {
+ COUNTER_SCOPE_DEVICE,
+ COUNTER_SCOPE_SIGNAL,
+ COUNTER_SCOPE_COUNT,
+};
+
+/**
+ * struct counter_component - Counter component identification
+ * @type: component type (Count, extension, etc.)
+ * @scope: component scope (Device, Count, or Signal)
+ * @parent: parent component identification number
+ * @id: component identification number
+ */
+struct counter_component {
+ __u8 type;
+ __u8 scope;
+ __u8 parent;
+ __u8 id;
+};
+
+/* Event type definitions */
+enum counter_event_type {
+ COUNTER_EVENT_OVERFLOW,
+ COUNTER_EVENT_UNDERFLOW,
+ COUNTER_EVENT_OVERFLOW_UNDERFLOW,
+ COUNTER_EVENT_THRESHOLD,
+ COUNTER_EVENT_INDEX,
+};
+
+/**
+ * struct counter_watch - Counter component watch configuration
+ * @component: component to watch when event triggers
+ * @event: event that triggers
+ * @channel: event channel
+ */
+struct counter_watch {
+ struct counter_component component;
+ __u8 event;
+ __u8 channel;
+};
+
+/* ioctl commands */
+#define COUNTER_CLEAR_WATCHES_IOCTL _IO(0x3E, 0x00)
+#define COUNTER_ADD_WATCH_IOCTL _IOW(0x3E, 0x01, struct counter_watch)
+#define COUNTER_LOAD_WATCHES_IOCTL _IO(0x3E, 0x02)
+
+/**
+ * struct counter_event - Counter event data
+ * @timestamp: best estimate of time of event occurrence, in nanoseconds
+ * @value: component value
+ * @watch: component watch configuration
+ * @errno: system error number
+ */
+struct counter_event {
+ __aligned_u64 timestamp;
+ __aligned_u64 value;
+ struct counter_watch watch;
+ __u8 errno;
+};
+
+/* Count direction values */
+enum counter_count_direction {
+ COUNTER_COUNT_DIRECTION_FORWARD,
+ COUNTER_COUNT_DIRECTION_BACKWARD,
+};
+
+/* Count mode values */
+enum counter_count_mode {
+ COUNTER_COUNT_MODE_NORMAL,
+ COUNTER_COUNT_MODE_RANGE_LIMIT,
+ COUNTER_COUNT_MODE_NON_RECYCLE,
+ COUNTER_COUNT_MODE_MODULO_N,
+};
+
+/* Count function values */
+enum counter_function {
+ COUNTER_FUNCTION_INCREASE,
+ COUNTER_FUNCTION_DECREASE,
+ COUNTER_FUNCTION_PULSE_DIRECTION,
+ COUNTER_FUNCTION_QUADRATURE_X1_A,
+ COUNTER_FUNCTION_QUADRATURE_X1_B,
+ COUNTER_FUNCTION_QUADRATURE_X2_A,
+ COUNTER_FUNCTION_QUADRATURE_X2_B,
+ COUNTER_FUNCTION_QUADRATURE_X4,
+};
+
+/* Signal values */
+enum counter_signal_level {
+ COUNTER_SIGNAL_LEVEL_LOW,
+ COUNTER_SIGNAL_LEVEL_HIGH,
+};
+
+/* Action mode values */
+enum counter_synapse_action {
+ COUNTER_SYNAPSE_ACTION_NONE,
+ COUNTER_SYNAPSE_ACTION_RISING_EDGE,
+ COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
+ COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
+};
+
+#endif /* _UAPI_COUNTER_H_ */
--
2.29.2
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