diff options
Diffstat (limited to 'include/media/lirc_dev.h')
-rw-r--r-- | include/media/lirc_dev.h | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/include/media/lirc_dev.h b/include/media/lirc_dev.h deleted file mode 100644 index d9c143d17f70..000000000000 --- a/include/media/lirc_dev.h +++ /dev/null @@ -1,192 +0,0 @@ -/* - * LIRC base driver - * - * by Artur Lipowski <alipowski@interia.pl> - * This code is licensed under GNU GPL - * - */ - -#ifndef _LINUX_LIRC_DEV_H -#define _LINUX_LIRC_DEV_H - -#define BUFLEN 16 - -#include <linux/slab.h> -#include <linux/fs.h> -#include <linux/ioctl.h> -#include <linux/poll.h> -#include <linux/kfifo.h> -#include <media/lirc.h> -#include <linux/device.h> -#include <linux/cdev.h> - -struct lirc_buffer { - wait_queue_head_t wait_poll; - spinlock_t fifo_lock; - unsigned int chunk_size; - unsigned int size; /* in chunks */ - /* Using chunks instead of bytes pretends to simplify boundary checking - * And should allow for some performance fine tunning later */ - struct kfifo fifo; -}; - -static inline void lirc_buffer_clear(struct lirc_buffer *buf) -{ - unsigned long flags; - - if (kfifo_initialized(&buf->fifo)) { - spin_lock_irqsave(&buf->fifo_lock, flags); - kfifo_reset(&buf->fifo); - spin_unlock_irqrestore(&buf->fifo_lock, flags); - } else - WARN(1, "calling %s on an uninitialized lirc_buffer\n", - __func__); -} - -static inline int lirc_buffer_init(struct lirc_buffer *buf, - unsigned int chunk_size, - unsigned int size) -{ - int ret; - - init_waitqueue_head(&buf->wait_poll); - spin_lock_init(&buf->fifo_lock); - buf->chunk_size = chunk_size; - buf->size = size; - ret = kfifo_alloc(&buf->fifo, size * chunk_size, GFP_KERNEL); - - return ret; -} - -static inline void lirc_buffer_free(struct lirc_buffer *buf) -{ - if (kfifo_initialized(&buf->fifo)) { - kfifo_free(&buf->fifo); - } else - WARN(1, "calling %s on an uninitialized lirc_buffer\n", - __func__); -} - -static inline int lirc_buffer_len(struct lirc_buffer *buf) -{ - int len; - unsigned long flags; - - spin_lock_irqsave(&buf->fifo_lock, flags); - len = kfifo_len(&buf->fifo); - spin_unlock_irqrestore(&buf->fifo_lock, flags); - - return len; -} - -static inline int lirc_buffer_full(struct lirc_buffer *buf) -{ - return lirc_buffer_len(buf) == buf->size * buf->chunk_size; -} - -static inline int lirc_buffer_empty(struct lirc_buffer *buf) -{ - return !lirc_buffer_len(buf); -} - -static inline unsigned int lirc_buffer_read(struct lirc_buffer *buf, - unsigned char *dest) -{ - unsigned int ret = 0; - - if (lirc_buffer_len(buf) >= buf->chunk_size) - ret = kfifo_out_locked(&buf->fifo, dest, buf->chunk_size, - &buf->fifo_lock); - return ret; - -} - -static inline unsigned int lirc_buffer_write(struct lirc_buffer *buf, - unsigned char *orig) -{ - unsigned int ret; - - ret = kfifo_in_locked(&buf->fifo, orig, buf->chunk_size, - &buf->fifo_lock); - - return ret; -} - -/** - * struct lirc_dev - represents a LIRC device - * - * @name: used for logging - * @minor: the minor device (/dev/lircX) number for the device - * @code_length: length of a remote control key code expressed in bits - * @features: lirc compatible hardware features, like LIRC_MODE_RAW, - * LIRC_CAN\_\*, as defined at include/media/lirc.h. - * @buffer_size: Number of FIFO buffers with @chunk_size size. - * Only used if @rbuf is NULL. - * @chunk_size: Size of each FIFO buffer. - * Only used if @rbuf is NULL. - * @data: private per-driver data - * @buf: if %NULL, lirc_dev will allocate and manage the buffer, - * otherwise allocated by the caller which will - * have to write to the buffer by other means, like irq's - * (see also lirc_serial.c). - * @buf_internal: whether lirc_dev has allocated the read buffer or not - * @rdev: &struct rc_dev associated with the device - * @fops: &struct file_operations for the device - * @owner: the module owning this struct - * @attached: if the device is still live - * @open: open count for the device's chardev - * @mutex: serialises file_operations calls - * @dev: &struct device assigned to the device - * @cdev: &struct cdev assigned to the device - */ -struct lirc_dev { - char name[40]; - unsigned int minor; - __u32 code_length; - __u32 features; - - unsigned int buffer_size; /* in chunks holding one code each */ - unsigned int chunk_size; - struct lirc_buffer *buf; - bool buf_internal; - - void *data; - struct rc_dev *rdev; - const struct file_operations *fops; - struct module *owner; - - bool attached; - int open; - - struct mutex mutex; /* protect from simultaneous accesses */ - - struct device dev; - struct cdev cdev; -}; - -struct lirc_dev *lirc_allocate_device(void); - -void lirc_free_device(struct lirc_dev *d); - -int lirc_register_device(struct lirc_dev *d); - -void lirc_unregister_device(struct lirc_dev *d); - -/* Must be called in the open fop before lirc_get_pdata() can be used */ -void lirc_init_pdata(struct inode *inode, struct file *file); - -/* Returns the private data stored in the lirc_dev - * associated with the given device file pointer. - */ -void *lirc_get_pdata(struct file *file); - -/* default file operations - * used by drivers if they override only some operations - */ -int lirc_dev_fop_open(struct inode *inode, struct file *file); -int lirc_dev_fop_close(struct inode *inode, struct file *file); -__poll_t lirc_dev_fop_poll(struct file *file, poll_table *wait); -long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg); -ssize_t lirc_dev_fop_read(struct file *file, char __user *buffer, size_t length, - loff_t *ppos); -#endif |