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Diffstat (limited to 'drivers/platform/chrome/wilco_ec/event.c')
-rw-r--r--drivers/platform/chrome/wilco_ec/event.c581
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diff --git a/drivers/platform/chrome/wilco_ec/event.c b/drivers/platform/chrome/wilco_ec/event.c
new file mode 100644
index 000000000..32e400590
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+++ b/drivers/platform/chrome/wilco_ec/event.c
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+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ACPI event handling for Wilco Embedded Controller
+ *
+ * Copyright 2019 Google LLC
+ *
+ * The Wilco Embedded Controller can create custom events that
+ * are not handled as standard ACPI objects. These events can
+ * contain information about changes in EC controlled features,
+ * such as errors and events in the dock or display. For example,
+ * an event is triggered if the dock is plugged into a display
+ * incorrectly. These events are needed for telemetry and
+ * diagnostics reasons, and for possibly alerting the user.
+
+ * These events are triggered by the EC with an ACPI Notify(0x90),
+ * and then the BIOS reads the event buffer from EC RAM via an
+ * ACPI method. When the OS receives these events via ACPI,
+ * it passes them along to this driver. The events are put into
+ * a queue which can be read by a userspace daemon via a char device
+ * that implements read() and poll(). The event queue acts as a
+ * circular buffer of size 64, so if there are no userspace consumers
+ * the kernel will not run out of memory. The char device will appear at
+ * /dev/wilco_event{n}, where n is some small non-negative integer,
+ * starting from 0. Standard ACPI events such as the battery getting
+ * plugged/unplugged can also come through this path, but they are
+ * dealt with via other paths, and are ignored here.
+
+ * To test, you can tail the binary data with
+ * $ cat /dev/wilco_event0 | hexdump -ve '1/1 "%x\n"'
+ * and then create an event by plugging/unplugging the battery.
+ */
+
+#include <linux/acpi.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/idr.h>
+#include <linux/io.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+
+/* ACPI Notify event code indicating event data is available. */
+#define EC_ACPI_NOTIFY_EVENT 0x90
+/* ACPI Method to execute to retrieve event data buffer from the EC. */
+#define EC_ACPI_GET_EVENT "QSET"
+/* Maximum number of words in event data returned by the EC. */
+#define EC_ACPI_MAX_EVENT_WORDS 6
+#define EC_ACPI_MAX_EVENT_SIZE \
+ (sizeof(struct ec_event) + (EC_ACPI_MAX_EVENT_WORDS) * sizeof(u16))
+
+/* Node will appear in /dev/EVENT_DEV_NAME */
+#define EVENT_DEV_NAME "wilco_event"
+#define EVENT_CLASS_NAME EVENT_DEV_NAME
+#define DRV_NAME EVENT_DEV_NAME
+#define EVENT_DEV_NAME_FMT (EVENT_DEV_NAME "%d")
+static struct class event_class = {
+ .owner = THIS_MODULE,
+ .name = EVENT_CLASS_NAME,
+};
+
+/* Keep track of all the device numbers used. */
+#define EVENT_MAX_DEV 128
+static int event_major;
+static DEFINE_IDA(event_ida);
+
+/* Size of circular queue of events. */
+#define MAX_NUM_EVENTS 64
+
+/**
+ * struct ec_event - Extended event returned by the EC.
+ * @size: Number of 16bit words in structure after the size word.
+ * @type: Extended event type, meaningless for us.
+ * @event: Event data words. Max count is %EC_ACPI_MAX_EVENT_WORDS.
+ */
+struct ec_event {
+ u16 size;
+ u16 type;
+ u16 event[];
+} __packed;
+
+#define ec_event_num_words(ev) (ev->size - 1)
+#define ec_event_size(ev) (sizeof(*ev) + (ec_event_num_words(ev) * sizeof(u16)))
+
+/**
+ * struct ec_event_queue - Circular queue for events.
+ * @capacity: Number of elements the queue can hold.
+ * @head: Next index to write to.
+ * @tail: Next index to read from.
+ * @entries: Array of events.
+ */
+struct ec_event_queue {
+ int capacity;
+ int head;
+ int tail;
+ struct ec_event *entries[];
+};
+
+/* Maximum number of events to store in ec_event_queue */
+static int queue_size = 64;
+module_param(queue_size, int, 0644);
+
+static struct ec_event_queue *event_queue_new(int capacity)
+{
+ struct ec_event_queue *q;
+
+ q = kzalloc(struct_size(q, entries, capacity), GFP_KERNEL);
+ if (!q)
+ return NULL;
+
+ q->capacity = capacity;
+
+ return q;
+}
+
+static inline bool event_queue_empty(struct ec_event_queue *q)
+{
+ /* head==tail when both full and empty, but head==NULL when empty */
+ return q->head == q->tail && !q->entries[q->head];
+}
+
+static inline bool event_queue_full(struct ec_event_queue *q)
+{
+ /* head==tail when both full and empty, but head!=NULL when full */
+ return q->head == q->tail && q->entries[q->head];
+}
+
+static struct ec_event *event_queue_pop(struct ec_event_queue *q)
+{
+ struct ec_event *ev;
+
+ if (event_queue_empty(q))
+ return NULL;
+
+ ev = q->entries[q->tail];
+ q->entries[q->tail] = NULL;
+ q->tail = (q->tail + 1) % q->capacity;
+
+ return ev;
+}
+
+/*
+ * If full, overwrite the oldest event and return it so the caller
+ * can kfree it. If not full, return NULL.
+ */
+static struct ec_event *event_queue_push(struct ec_event_queue *q,
+ struct ec_event *ev)
+{
+ struct ec_event *popped = NULL;
+
+ if (event_queue_full(q))
+ popped = event_queue_pop(q);
+ q->entries[q->head] = ev;
+ q->head = (q->head + 1) % q->capacity;
+
+ return popped;
+}
+
+static void event_queue_free(struct ec_event_queue *q)
+{
+ struct ec_event *event;
+
+ while ((event = event_queue_pop(q)) != NULL)
+ kfree(event);
+
+ kfree(q);
+}
+
+/**
+ * struct event_device_data - Data for a Wilco EC device that responds to ACPI.
+ * @events: Circular queue of EC events to be provided to userspace.
+ * @queue_lock: Protect the queue from simultaneous read/writes.
+ * @wq: Wait queue to notify processes when events are available or the
+ * device has been removed.
+ * @cdev: Char dev that userspace reads() and polls() from.
+ * @dev: Device associated with the %cdev.
+ * @exist: Has the device been not been removed? Once a device has been removed,
+ * writes, reads, and new opens will fail.
+ * @available: Guarantee only one client can open() file and read from queue.
+ *
+ * There will be one of these structs for each ACPI device registered. This data
+ * is the queue of events received from ACPI that still need to be read from
+ * userspace, the device and char device that userspace is using, a wait queue
+ * used to notify different threads when something has changed, plus a flag
+ * on whether the ACPI device has been removed.
+ */
+struct event_device_data {
+ struct ec_event_queue *events;
+ spinlock_t queue_lock;
+ wait_queue_head_t wq;
+ struct device dev;
+ struct cdev cdev;
+ bool exist;
+ atomic_t available;
+};
+
+/**
+ * enqueue_events() - Place EC events in queue to be read by userspace.
+ * @adev: Device the events came from.
+ * @buf: Buffer of event data.
+ * @length: Length of event data buffer.
+ *
+ * %buf contains a number of ec_event's, packed one after the other.
+ * Each ec_event is of variable length. Start with the first event, copy it
+ * into a persistent ec_event, store that entry in the queue, move on
+ * to the next ec_event in buf, and repeat.
+ *
+ * Return: 0 on success or negative error code on failure.
+ */
+static int enqueue_events(struct acpi_device *adev, const u8 *buf, u32 length)
+{
+ struct event_device_data *dev_data = adev->driver_data;
+ struct ec_event *event, *queue_event, *old_event;
+ size_t num_words, event_size;
+ u32 offset = 0;
+
+ while (offset < length) {
+ event = (struct ec_event *)(buf + offset);
+
+ num_words = ec_event_num_words(event);
+ event_size = ec_event_size(event);
+ if (num_words > EC_ACPI_MAX_EVENT_WORDS) {
+ dev_err(&adev->dev, "Too many event words: %zu > %d\n",
+ num_words, EC_ACPI_MAX_EVENT_WORDS);
+ return -EOVERFLOW;
+ }
+
+ /* Ensure event does not overflow the available buffer */
+ if ((offset + event_size) > length) {
+ dev_err(&adev->dev, "Event exceeds buffer: %zu > %d\n",
+ offset + event_size, length);
+ return -EOVERFLOW;
+ }
+
+ /* Point to the next event in the buffer */
+ offset += event_size;
+
+ /* Copy event into the queue */
+ queue_event = kmemdup(event, event_size, GFP_KERNEL);
+ if (!queue_event)
+ return -ENOMEM;
+ spin_lock(&dev_data->queue_lock);
+ old_event = event_queue_push(dev_data->events, queue_event);
+ spin_unlock(&dev_data->queue_lock);
+ kfree(old_event);
+ wake_up_interruptible(&dev_data->wq);
+ }
+
+ return 0;
+}
+
+/**
+ * event_device_notify() - Callback when EC generates an event over ACPI.
+ * @adev: The device that the event is coming from.
+ * @value: Value passed to Notify() in ACPI.
+ *
+ * This function will read the events from the device and enqueue them.
+ */
+static void event_device_notify(struct acpi_device *adev, u32 value)
+{
+ struct acpi_buffer event_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ acpi_status status;
+
+ if (value != EC_ACPI_NOTIFY_EVENT) {
+ dev_err(&adev->dev, "Invalid event: 0x%08x\n", value);
+ return;
+ }
+
+ /* Execute ACPI method to get event data buffer. */
+ status = acpi_evaluate_object(adev->handle, EC_ACPI_GET_EVENT,
+ NULL, &event_buffer);
+ if (ACPI_FAILURE(status)) {
+ dev_err(&adev->dev, "Error executing ACPI method %s()\n",
+ EC_ACPI_GET_EVENT);
+ return;
+ }
+
+ obj = (union acpi_object *)event_buffer.pointer;
+ if (!obj) {
+ dev_err(&adev->dev, "Nothing returned from %s()\n",
+ EC_ACPI_GET_EVENT);
+ return;
+ }
+ if (obj->type != ACPI_TYPE_BUFFER) {
+ dev_err(&adev->dev, "Invalid object returned from %s()\n",
+ EC_ACPI_GET_EVENT);
+ kfree(obj);
+ return;
+ }
+ if (obj->buffer.length < sizeof(struct ec_event)) {
+ dev_err(&adev->dev, "Invalid buffer length %d from %s()\n",
+ obj->buffer.length, EC_ACPI_GET_EVENT);
+ kfree(obj);
+ return;
+ }
+
+ enqueue_events(adev, obj->buffer.pointer, obj->buffer.length);
+ kfree(obj);
+}
+
+static int event_open(struct inode *inode, struct file *filp)
+{
+ struct event_device_data *dev_data;
+
+ dev_data = container_of(inode->i_cdev, struct event_device_data, cdev);
+ if (!dev_data->exist)
+ return -ENODEV;
+
+ if (atomic_cmpxchg(&dev_data->available, 1, 0) == 0)
+ return -EBUSY;
+
+ /* Increase refcount on device so dev_data is not freed */
+ get_device(&dev_data->dev);
+ stream_open(inode, filp);
+ filp->private_data = dev_data;
+
+ return 0;
+}
+
+static __poll_t event_poll(struct file *filp, poll_table *wait)
+{
+ struct event_device_data *dev_data = filp->private_data;
+ __poll_t mask = 0;
+
+ poll_wait(filp, &dev_data->wq, wait);
+ if (!dev_data->exist)
+ return EPOLLHUP;
+ if (!event_queue_empty(dev_data->events))
+ mask |= EPOLLIN | EPOLLRDNORM | EPOLLPRI;
+ return mask;
+}
+
+/**
+ * event_read() - Callback for passing event data to userspace via read().
+ * @filp: The file we are reading from.
+ * @buf: Pointer to userspace buffer to fill with one event.
+ * @count: Number of bytes requested. Must be at least EC_ACPI_MAX_EVENT_SIZE.
+ * @pos: File position pointer, irrelevant since we don't support seeking.
+ *
+ * Removes the first event from the queue, places it in the passed buffer.
+ *
+ * If there are no events in the queue, then one of two things happens,
+ * depending on if the file was opened in nonblocking mode: If in nonblocking
+ * mode, then return -EAGAIN to say there's no data. If in blocking mode, then
+ * block until an event is available.
+ *
+ * Return: Number of bytes placed in buffer, negative error code on failure.
+ */
+static ssize_t event_read(struct file *filp, char __user *buf, size_t count,
+ loff_t *pos)
+{
+ struct event_device_data *dev_data = filp->private_data;
+ struct ec_event *event;
+ ssize_t n_bytes_written = 0;
+ int err;
+
+ /* We only will give them the entire event at once */
+ if (count != 0 && count < EC_ACPI_MAX_EVENT_SIZE)
+ return -EINVAL;
+
+ spin_lock(&dev_data->queue_lock);
+ while (event_queue_empty(dev_data->events)) {
+ spin_unlock(&dev_data->queue_lock);
+ if (filp->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ err = wait_event_interruptible(dev_data->wq,
+ !event_queue_empty(dev_data->events) ||
+ !dev_data->exist);
+ if (err)
+ return err;
+
+ /* Device was removed as we waited? */
+ if (!dev_data->exist)
+ return -ENODEV;
+ spin_lock(&dev_data->queue_lock);
+ }
+ event = event_queue_pop(dev_data->events);
+ spin_unlock(&dev_data->queue_lock);
+ n_bytes_written = ec_event_size(event);
+ if (copy_to_user(buf, event, n_bytes_written))
+ n_bytes_written = -EFAULT;
+ kfree(event);
+
+ return n_bytes_written;
+}
+
+static int event_release(struct inode *inode, struct file *filp)
+{
+ struct event_device_data *dev_data = filp->private_data;
+
+ atomic_set(&dev_data->available, 1);
+ put_device(&dev_data->dev);
+
+ return 0;
+}
+
+static const struct file_operations event_fops = {
+ .open = event_open,
+ .poll = event_poll,
+ .read = event_read,
+ .release = event_release,
+ .llseek = no_llseek,
+ .owner = THIS_MODULE,
+};
+
+/**
+ * free_device_data() - Callback to free the event_device_data structure.
+ * @d: The device embedded in our device data, which we have been ref counting.
+ *
+ * This is called only after event_device_remove() has been called and all
+ * userspace programs have called event_release() on all the open file
+ * descriptors.
+ */
+static void free_device_data(struct device *d)
+{
+ struct event_device_data *dev_data;
+
+ dev_data = container_of(d, struct event_device_data, dev);
+ event_queue_free(dev_data->events);
+ kfree(dev_data);
+}
+
+static void hangup_device(struct event_device_data *dev_data)
+{
+ dev_data->exist = false;
+ /* Wake up the waiting processes so they can close. */
+ wake_up_interruptible(&dev_data->wq);
+ put_device(&dev_data->dev);
+}
+
+/**
+ * event_device_add() - Callback when creating a new device.
+ * @adev: ACPI device that we will be receiving events from.
+ *
+ * This finds a free minor number for the device, allocates and initializes
+ * some device data, and creates a new device and char dev node.
+ *
+ * The device data is freed in free_device_data(), which is called when
+ * %dev_data->dev is release()ed. This happens after all references to
+ * %dev_data->dev are dropped, which happens once both event_device_remove()
+ * has been called and every open()ed file descriptor has been release()ed.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+static int event_device_add(struct acpi_device *adev)
+{
+ struct event_device_data *dev_data;
+ int error, minor;
+
+ minor = ida_alloc_max(&event_ida, EVENT_MAX_DEV-1, GFP_KERNEL);
+ if (minor < 0) {
+ error = minor;
+ dev_err(&adev->dev, "Failed to find minor number: %d\n", error);
+ return error;
+ }
+
+ dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
+ if (!dev_data) {
+ error = -ENOMEM;
+ goto free_minor;
+ }
+
+ /* Initialize the device data. */
+ adev->driver_data = dev_data;
+ dev_data->events = event_queue_new(queue_size);
+ if (!dev_data->events) {
+ kfree(dev_data);
+ error = -ENOMEM;
+ goto free_minor;
+ }
+ spin_lock_init(&dev_data->queue_lock);
+ init_waitqueue_head(&dev_data->wq);
+ dev_data->exist = true;
+ atomic_set(&dev_data->available, 1);
+
+ /* Initialize the device. */
+ dev_data->dev.devt = MKDEV(event_major, minor);
+ dev_data->dev.class = &event_class;
+ dev_data->dev.release = free_device_data;
+ dev_set_name(&dev_data->dev, EVENT_DEV_NAME_FMT, minor);
+ device_initialize(&dev_data->dev);
+
+ /* Initialize the character device, and add it to userspace. */
+ cdev_init(&dev_data->cdev, &event_fops);
+ error = cdev_device_add(&dev_data->cdev, &dev_data->dev);
+ if (error)
+ goto free_dev_data;
+
+ return 0;
+
+free_dev_data:
+ hangup_device(dev_data);
+free_minor:
+ ida_simple_remove(&event_ida, minor);
+ return error;
+}
+
+static int event_device_remove(struct acpi_device *adev)
+{
+ struct event_device_data *dev_data = adev->driver_data;
+
+ cdev_device_del(&dev_data->cdev, &dev_data->dev);
+ ida_simple_remove(&event_ida, MINOR(dev_data->dev.devt));
+ hangup_device(dev_data);
+
+ return 0;
+}
+
+static const struct acpi_device_id event_acpi_ids[] = {
+ { "GOOG000D", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, event_acpi_ids);
+
+static struct acpi_driver event_driver = {
+ .name = DRV_NAME,
+ .class = DRV_NAME,
+ .ids = event_acpi_ids,
+ .ops = {
+ .add = event_device_add,
+ .notify = event_device_notify,
+ .remove = event_device_remove,
+ },
+ .owner = THIS_MODULE,
+};
+
+static int __init event_module_init(void)
+{
+ dev_t dev_num = 0;
+ int ret;
+
+ ret = class_register(&event_class);
+ if (ret) {
+ pr_err(DRV_NAME ": Failed registering class: %d\n", ret);
+ return ret;
+ }
+
+ /* Request device numbers, starting with minor=0. Save the major num. */
+ ret = alloc_chrdev_region(&dev_num, 0, EVENT_MAX_DEV, EVENT_DEV_NAME);
+ if (ret) {
+ pr_err(DRV_NAME ": Failed allocating dev numbers: %d\n", ret);
+ goto destroy_class;
+ }
+ event_major = MAJOR(dev_num);
+
+ ret = acpi_bus_register_driver(&event_driver);
+ if (ret < 0) {
+ pr_err(DRV_NAME ": Failed registering driver: %d\n", ret);
+ goto unregister_region;
+ }
+
+ return 0;
+
+unregister_region:
+ unregister_chrdev_region(MKDEV(event_major, 0), EVENT_MAX_DEV);
+destroy_class:
+ class_unregister(&event_class);
+ ida_destroy(&event_ida);
+ return ret;
+}
+
+static void __exit event_module_exit(void)
+{
+ acpi_bus_unregister_driver(&event_driver);
+ unregister_chrdev_region(MKDEV(event_major, 0), EVENT_MAX_DEV);
+ class_unregister(&event_class);
+ ida_destroy(&event_ida);
+}
+
+module_init(event_module_init);
+module_exit(event_module_exit);
+
+MODULE_AUTHOR("Nick Crews <ncrews@chromium.org>");
+MODULE_DESCRIPTION("Wilco EC ACPI event driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);