media: rc: Add remote control event report from user space input
Some of user space applications need to send the remote key events
to kernel input subsystem, so for these type of applications this driver
enables them to send key events to kernel.
User has to send the key event type (pressed,repeated,released) and scan
code value.
Change-Id: I31a03044702020bd7bfd6cfdc310e65f85d282ef
Signed-off-by: Ravi Kumar V <kumarrav@codeaurora.org>
diff --git a/drivers/media/rc/user-rc-input.c b/drivers/media/rc/user-rc-input.c
new file mode 100644
index 0000000..f1a9334
--- /dev/null
+++ b/drivers/media/rc/user-rc-input.c
@@ -0,0 +1,251 @@
+/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/ioctl.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/cdev.h>
+#include <linux/slab.h>
+
+#include <media/rc-core.h>
+#include <media/user-rc-input.h>
+
+#define MAX_RC_DEVICES 1
+#define USER_RC_INPUT_DEV_NAME "user-rc-input"
+#define USER_RC_INPUT_DRV_NAME "rc-user-input"
+
+struct user_rc_input_dev {
+ struct cdev rc_input_cdev;
+ struct class *rc_input_class;
+ struct device *rc_input_dev;
+ struct rc_dev *rcdev;
+ dev_t rc_input_base_dev;
+ struct device *dev;
+ int in_use;
+};
+
+static int user_rc_input_open(struct inode *inode, struct file *file)
+{
+ struct cdev *input_cdev = inode->i_cdev;
+ struct user_rc_input_dev *input_dev =
+ container_of(input_cdev, struct user_rc_input_dev, rc_input_cdev);
+
+ if (input_dev->in_use) {
+ dev_err(input_dev->dev,
+ "Device is already open..only one instance is allowed\n");
+ return -EBUSY;
+ }
+ input_dev->in_use++;
+ file->private_data = input_dev;
+
+ return 0;
+}
+
+static int user_rc_input_release(struct inode *inode, struct file *file)
+{
+ struct user_rc_input_dev *input_dev = file->private_data;
+
+ input_dev->in_use--;
+
+ return 0;
+}
+
+static ssize_t user_rc_input_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ int ret;
+ struct user_rc_input_dev *input_dev = file->private_data;
+ __u8 *buf;
+
+ buf = kmalloc(count * sizeof(__u8), GFP_KERNEL);
+ if (!buf) {
+ dev_err(input_dev->dev,
+ "kmalloc failed...Insufficient memory\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ if (copy_from_user(buf, buffer, count)) {
+ dev_err(input_dev->dev, "Copy from user failed\n");
+ ret = -EFAULT;
+ goto out_free;
+ }
+
+ switch (buf[0]) {
+ case USER_CONTROL_PRESSED:
+ dev_dbg(input_dev->dev, "user controlled"
+ " pressed 0x%x\n", buf[1]);
+ rc_keydown(input_dev->rcdev, buf[1], 0);
+ break;
+ case USER_CONTROL_REPEATED:
+ dev_dbg(input_dev->dev, "user controlled"
+ " repeated 0x%x\n", buf[1]);
+ rc_repeat(input_dev->rcdev);
+ break;
+ case USER_CONTROL_RELEASED:
+ dev_dbg(input_dev->dev, "user controlled"
+ " released 0x%x\n", buf[1]);
+ rc_keyup(input_dev->rcdev);
+ break;
+ }
+
+out_free:
+ kfree(buf);
+out:
+ return ret;
+}
+
+const struct file_operations fops = {
+ .owner = THIS_MODULE,
+ .open = user_rc_input_open,
+ .write = user_rc_input_write,
+ .release = user_rc_input_release,
+};
+
+static int __devinit user_rc_input_probe(struct platform_device *pdev)
+{
+ struct user_rc_input_dev *user_rc_dev;
+ struct rc_dev *rcdev;
+ int retval;
+
+ user_rc_dev = kzalloc(sizeof(struct user_rc_input_dev), GFP_KERNEL);
+ if (!user_rc_dev)
+ return -ENOMEM;
+
+ user_rc_dev->rc_input_class = class_create(THIS_MODULE,
+ "user-rc-input-loopback");
+
+ if (IS_ERR(user_rc_dev->rc_input_class)) {
+ retval = PTR_ERR(user_rc_dev->rc_input_class);
+ goto err;
+ }
+
+ retval = alloc_chrdev_region(&user_rc_dev->rc_input_base_dev, 0,
+ MAX_RC_DEVICES, USER_RC_INPUT_DEV_NAME);
+
+ if (retval) {
+ dev_err(&pdev->dev,
+ "alloc_chrdev_region failed\n");
+ goto alloc_chrdev_err;
+ }
+
+ dev_info(&pdev->dev, "User space report key event input "
+ "loopback driver registered, "
+ "major %d\n", MAJOR(user_rc_dev->rc_input_base_dev));
+
+ cdev_init(&user_rc_dev->rc_input_cdev, &fops);
+ retval = cdev_add(&user_rc_dev->rc_input_cdev,
+ user_rc_dev->rc_input_base_dev,
+ MAX_RC_DEVICES);
+ if (retval) {
+ dev_err(&pdev->dev, "cdev_add failed\n");
+ goto cdev_add_err;
+ }
+ user_rc_dev->rc_input_dev =
+ device_create(user_rc_dev->rc_input_class,
+ NULL,
+ MKDEV(MAJOR(user_rc_dev->rc_input_base_dev),
+ 0), NULL, "user-rc-input-dev%d", 0);
+
+ if (IS_ERR(user_rc_dev->rc_input_dev)) {
+ retval = PTR_ERR(user_rc_dev->rc_input_dev);
+ dev_err(&pdev->dev, "device_create failed\n");
+ goto device_create_err;
+ }
+
+ rcdev = rc_allocate_device();
+ if (!rcdev) {
+ dev_err(&pdev->dev, "failed to allocate rc device");
+ retval = -ENOMEM;
+ goto err_allocate_device;
+ }
+
+ rcdev->driver_type = RC_DRIVER_SCANCODE;
+ rcdev->allowed_protos = RC_TYPE_OTHER;
+ rcdev->input_name = USER_RC_INPUT_DEV_NAME;
+ rcdev->input_id.bustype = BUS_HOST;
+ rcdev->driver_name = USER_RC_INPUT_DRV_NAME;
+ rcdev->map_name = RC_MAP_UE_RF4CE;
+
+ retval = rc_register_device(rcdev);
+ if (retval < 0) {
+ dev_err(&pdev->dev, "failed to register rc device\n");
+ goto rc_register_err;
+ }
+ user_rc_dev->rcdev = rcdev;
+ user_rc_dev->dev = &pdev->dev;
+ platform_set_drvdata(pdev, user_rc_dev);
+ user_rc_dev->in_use = 0;
+
+ return 0;
+
+rc_register_err:
+ rc_free_device(rcdev);
+err_allocate_device:
+ device_destroy(user_rc_dev->rc_input_class,
+ MKDEV(MAJOR(user_rc_dev->rc_input_base_dev), 0));
+cdev_add_err:
+ unregister_chrdev_region(user_rc_dev->rc_input_base_dev,
+ MAX_RC_DEVICES);
+device_create_err:
+ cdev_del(&user_rc_dev->rc_input_cdev);
+alloc_chrdev_err:
+ class_destroy(user_rc_dev->rc_input_class);
+err:
+ kfree(user_rc_dev);
+ return retval;
+}
+
+static int __devexit user_rc_input_remove(struct platform_device *pdev)
+{
+ struct user_rc_input_dev *user_rc_dev = platform_get_drvdata(pdev);
+
+ platform_set_drvdata(pdev, NULL);
+ rc_free_device(user_rc_dev->rcdev);
+ device_destroy(user_rc_dev->rc_input_class,
+ MKDEV(MAJOR(user_rc_dev->rc_input_base_dev), 0));
+ unregister_chrdev_region(user_rc_dev->rc_input_base_dev,
+ MAX_RC_DEVICES);
+ cdev_del(&user_rc_dev->rc_input_cdev);
+ class_destroy(user_rc_dev->rc_input_class);
+ kfree(user_rc_dev);
+
+ return 0;
+}
+
+static struct platform_driver user_rc_input_driver = {
+ .probe = user_rc_input_probe,
+ .remove = __devexit_p(user_rc_input_remove),
+ .driver = {
+ .name = USER_RC_INPUT_DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init user_rc_input_init(void)
+{
+ return platform_driver_register(&user_rc_input_driver);
+}
+module_init(user_rc_input_init);
+
+static void __exit user_rc_input_exit(void)
+{
+ platform_driver_unregister(&user_rc_input_driver);
+}
+module_exit(user_rc_input_exit);
+
+MODULE_DESCRIPTION("User RC Input driver");
+MODULE_LICENSE("GPL v2");