*/
#include <linux/jiffies.h>
+#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/input-polldev.h>
mutex_unlock(&polldev_mutex);
}
-static void input_polled_device_work(struct work_struct *work)
+static void input_polldev_queue_work(struct input_polled_dev *dev)
{
- struct input_polled_dev *dev =
- container_of(work, struct input_polled_dev, work.work);
unsigned long delay;
- dev->poll(dev);
-
delay = msecs_to_jiffies(dev->poll_interval);
if (delay >= HZ)
delay = round_jiffies_relative(delay);
queue_delayed_work(polldev_wq, &dev->work, delay);
}
+static void input_polled_device_work(struct work_struct *work)
+{
+ struct input_polled_dev *dev =
+ container_of(work, struct input_polled_dev, work.work);
+
+ dev->poll(dev);
+ input_polldev_queue_work(dev);
+}
+
static int input_open_polled_device(struct input_dev *input)
{
struct input_polled_dev *dev = input_get_drvdata(input);
if (dev->open)
dev->open(dev);
- queue_delayed_work(polldev_wq, &dev->work,
- msecs_to_jiffies(dev->poll_interval));
+ /* Only start polling if polling is enabled */
+ if (dev->poll_interval > 0)
+ queue_delayed_work(polldev_wq, &dev->work, 0);
return 0;
}
struct input_polled_dev *dev = input_get_drvdata(input);
cancel_delayed_work_sync(&dev->work);
+ /*
+ * Clean up work struct to remove references to the workqueue.
+ * It may be destroyed by the next call. This causes problems
+ * at next device open-close in case of poll_interval == 0.
+ */
+ INIT_DELAYED_WORK(&dev->work, dev->work.work.func);
input_polldev_stop_workqueue();
if (dev->close)
dev->close(dev);
}
+/* SYSFS interface */
+
+static ssize_t input_polldev_get_poll(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct input_polled_dev *polldev = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", polldev->poll_interval);
+}
+
+static ssize_t input_polldev_set_poll(struct device *dev,
+ struct device_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct input_polled_dev *polldev = dev_get_drvdata(dev);
+ struct input_dev *input = polldev->input;
+ unsigned long interval;
+
+ if (strict_strtoul(buf, 0, &interval))
+ return -EINVAL;
+
+ if (interval < polldev->poll_interval_min)
+ return -EINVAL;
+
+ if (interval > polldev->poll_interval_max)
+ return -EINVAL;
+
+ mutex_lock(&input->mutex);
+
+ polldev->poll_interval = interval;
+
+ if (input->users) {
+ cancel_delayed_work_sync(&polldev->work);
+ if (polldev->poll_interval > 0)
+ input_polldev_queue_work(polldev);
+ }
+
+ mutex_unlock(&input->mutex);
+
+ return count;
+}
+
+static DEVICE_ATTR(poll, S_IRUGO | S_IWUSR, input_polldev_get_poll,
+ input_polldev_set_poll);
+
+
+static ssize_t input_polldev_get_max(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct input_polled_dev *polldev = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", polldev->poll_interval_max);
+}
+
+static DEVICE_ATTR(max, S_IRUGO, input_polldev_get_max, NULL);
+
+static ssize_t input_polldev_get_min(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct input_polled_dev *polldev = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", polldev->poll_interval_min);
+}
+
+static DEVICE_ATTR(min, S_IRUGO, input_polldev_get_min, NULL);
+
+static struct attribute *sysfs_attrs[] = {
+ &dev_attr_poll.attr,
+ &dev_attr_max.attr,
+ &dev_attr_min.attr,
+ NULL
+};
+
+static struct attribute_group input_polldev_attribute_group = {
+ .attrs = sysfs_attrs
+};
+
/**
* input_allocate_polled_device - allocated memory polled device
*
* @dev: device to free
*
* The function frees memory allocated for polling device and drops
- * reference to the associated input device (if present).
+ * reference to the associated input device.
*/
void input_free_polled_device(struct input_polled_dev *dev)
{
int input_register_polled_device(struct input_polled_dev *dev)
{
struct input_dev *input = dev->input;
+ int error;
input_set_drvdata(input, dev);
INIT_DELAYED_WORK(&dev->work, input_polled_device_work);
if (!dev->poll_interval)
dev->poll_interval = 500;
+ if (!dev->poll_interval_max)
+ dev->poll_interval_max = dev->poll_interval;
input->open = input_open_polled_device;
input->close = input_close_polled_device;
- return input_register_device(input);
+ error = input_register_device(input);
+ if (error)
+ return error;
+
+ error = sysfs_create_group(&input->dev.kobj,
+ &input_polldev_attribute_group);
+ if (error) {
+ input_unregister_device(input);
+ return error;
+ }
+
+ /*
+ * Take extra reference to the underlying input device so
+ * that it survives call to input_unregister_polled_device()
+ * and is deleted only after input_free_polled_device()
+ * has been invoked. This is needed to ease task of freeing
+ * sparse keymaps.
+ */
+ input_get_device(input);
+
+ return 0;
}
EXPORT_SYMBOL(input_register_polled_device);
* The function unregisters previously registered polled input
* device from input layer. Polling is stopped and device is
* ready to be freed with call to input_free_polled_device().
- * Callers should not attempt to access dev->input pointer
- * after calling this function.
*/
void input_unregister_polled_device(struct input_polled_dev *dev)
{
+ sysfs_remove_group(&dev->input->dev.kobj,
+ &input_polldev_attribute_group);
+
input_unregister_device(dev->input);
- dev->input = NULL;
}
EXPORT_SYMBOL(input_unregister_polled_device);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff