![David Härdeman](/assets/img/avatar_default.png)
There are no users of this functionality (ir-lirc-codec.c has its own implementation and lirc_zilog.c doesn't use it) so remove it. This only affects users of the lirc kapi, not rc-core drivers. Signed-off-by: David Härdeman <david@hardeman.nu> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
193 lines
5 KiB
C
193 lines
5 KiB
C
/*
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* LIRC base driver
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*
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* by Artur Lipowski <alipowski@interia.pl>
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* This code is licensed under GNU GPL
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*
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*/
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#ifndef _LINUX_LIRC_DEV_H
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#define _LINUX_LIRC_DEV_H
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#define BUFLEN 16
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/ioctl.h>
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#include <linux/poll.h>
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#include <linux/kfifo.h>
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#include <media/lirc.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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struct lirc_buffer {
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wait_queue_head_t wait_poll;
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spinlock_t fifo_lock;
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unsigned int chunk_size;
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unsigned int size; /* in chunks */
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/* Using chunks instead of bytes pretends to simplify boundary checking
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* And should allow for some performance fine tunning later */
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struct kfifo fifo;
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};
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static inline void lirc_buffer_clear(struct lirc_buffer *buf)
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{
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unsigned long flags;
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if (kfifo_initialized(&buf->fifo)) {
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spin_lock_irqsave(&buf->fifo_lock, flags);
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kfifo_reset(&buf->fifo);
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spin_unlock_irqrestore(&buf->fifo_lock, flags);
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} else
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WARN(1, "calling %s on an uninitialized lirc_buffer\n",
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__func__);
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}
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static inline int lirc_buffer_init(struct lirc_buffer *buf,
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unsigned int chunk_size,
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unsigned int size)
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{
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int ret;
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init_waitqueue_head(&buf->wait_poll);
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spin_lock_init(&buf->fifo_lock);
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buf->chunk_size = chunk_size;
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buf->size = size;
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ret = kfifo_alloc(&buf->fifo, size * chunk_size, GFP_KERNEL);
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return ret;
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}
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static inline void lirc_buffer_free(struct lirc_buffer *buf)
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{
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if (kfifo_initialized(&buf->fifo)) {
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kfifo_free(&buf->fifo);
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} else
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WARN(1, "calling %s on an uninitialized lirc_buffer\n",
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__func__);
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}
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static inline int lirc_buffer_len(struct lirc_buffer *buf)
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{
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int len;
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unsigned long flags;
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spin_lock_irqsave(&buf->fifo_lock, flags);
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len = kfifo_len(&buf->fifo);
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spin_unlock_irqrestore(&buf->fifo_lock, flags);
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return len;
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}
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static inline int lirc_buffer_full(struct lirc_buffer *buf)
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{
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return lirc_buffer_len(buf) == buf->size * buf->chunk_size;
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}
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static inline int lirc_buffer_empty(struct lirc_buffer *buf)
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{
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return !lirc_buffer_len(buf);
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}
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static inline unsigned int lirc_buffer_read(struct lirc_buffer *buf,
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unsigned char *dest)
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{
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unsigned int ret = 0;
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if (lirc_buffer_len(buf) >= buf->chunk_size)
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ret = kfifo_out_locked(&buf->fifo, dest, buf->chunk_size,
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&buf->fifo_lock);
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return ret;
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}
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static inline unsigned int lirc_buffer_write(struct lirc_buffer *buf,
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unsigned char *orig)
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{
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unsigned int ret;
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ret = kfifo_in_locked(&buf->fifo, orig, buf->chunk_size,
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&buf->fifo_lock);
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return ret;
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}
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/**
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* struct lirc_dev - represents a LIRC device
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*
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* @name: used for logging
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* @minor: the minor device (/dev/lircX) number for the device
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* @code_length: length of a remote control key code expressed in bits
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* @features: lirc compatible hardware features, like LIRC_MODE_RAW,
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* LIRC_CAN\_\*, as defined at include/media/lirc.h.
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* @buffer_size: Number of FIFO buffers with @chunk_size size.
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* Only used if @rbuf is NULL.
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* @chunk_size: Size of each FIFO buffer.
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* Only used if @rbuf is NULL.
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* @data: private per-driver data
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* @buf: if %NULL, lirc_dev will allocate and manage the buffer,
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* otherwise allocated by the caller which will
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* have to write to the buffer by other means, like irq's
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* (see also lirc_serial.c).
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* @buf_internal: whether lirc_dev has allocated the read buffer or not
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* @rdev: &struct rc_dev associated with the device
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* @fops: &struct file_operations for the device
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* @owner: the module owning this struct
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* @attached: if the device is still live
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* @open: open count for the device's chardev
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* @mutex: serialises file_operations calls
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* @dev: &struct device assigned to the device
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* @cdev: &struct cdev assigned to the device
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*/
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struct lirc_dev {
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char name[40];
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unsigned int minor;
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__u32 code_length;
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__u32 features;
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unsigned int buffer_size; /* in chunks holding one code each */
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unsigned int chunk_size;
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struct lirc_buffer *buf;
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bool buf_internal;
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void *data;
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struct rc_dev *rdev;
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const struct file_operations *fops;
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struct module *owner;
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bool attached;
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int open;
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struct mutex mutex; /* protect from simultaneous accesses */
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struct device dev;
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struct cdev cdev;
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};
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struct lirc_dev *lirc_allocate_device(void);
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void lirc_free_device(struct lirc_dev *d);
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int lirc_register_device(struct lirc_dev *d);
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void lirc_unregister_device(struct lirc_dev *d);
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/* Must be called in the open fop before lirc_get_pdata() can be used */
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void lirc_init_pdata(struct inode *inode, struct file *file);
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/* Returns the private data stored in the lirc_dev
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* associated with the given device file pointer.
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*/
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void *lirc_get_pdata(struct file *file);
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/* default file operations
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* used by drivers if they override only some operations
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*/
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int lirc_dev_fop_open(struct inode *inode, struct file *file);
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int lirc_dev_fop_close(struct inode *inode, struct file *file);
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unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait);
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long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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ssize_t lirc_dev_fop_read(struct file *file, char __user *buffer, size_t length,
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loff_t *ppos);
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#endif
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