/* * 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);unsigned int 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