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77d381af73
We can use kfifo_initialized() to check if the fifo in lirc_buffer is initialized or not. There's no need to have a dedicated fifo status variable in lirc_buffer. [m.chehab@samsung.com: add the same change to lirc_zilog, to avoid breaking compilation of staging drivers] Signed-off-by: Martin Kaiser <martin@kaiser.cx> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
223 lines
5.6 KiB
C
223 lines
5.6 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 MAX_IRCTL_DEVICES 8
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#define BUFLEN 16
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#define mod(n, div) ((n) % (div))
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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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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 int lirc_buffer_available(struct lirc_buffer *buf)
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{
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return buf->size - (lirc_buffer_len(buf) / buf->chunk_size);
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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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struct lirc_driver {
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char name[40];
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int minor;
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__u32 code_length;
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unsigned int buffer_size; /* in chunks holding one code each */
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int sample_rate;
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__u32 features;
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unsigned int chunk_size;
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void *data;
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int min_timeout;
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int max_timeout;
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int (*add_to_buf) (void *data, struct lirc_buffer *buf);
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struct lirc_buffer *rbuf;
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int (*set_use_inc) (void *data);
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void (*set_use_dec) (void *data);
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struct rc_dev *rdev;
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const struct file_operations *fops;
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struct device *dev;
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struct module *owner;
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};
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/* name:
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* this string will be used for logs
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*
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* minor:
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* indicates minor device (/dev/lirc) number for registered driver
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* if caller fills it with negative value, then the first free minor
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* number will be used (if available)
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*
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* code_length:
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* length of the remote control key code expressed in bits
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*
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* sample_rate:
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*
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* data:
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* it may point to any driver data and this pointer will be passed to
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* all callback functions
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*
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* add_to_buf:
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* add_to_buf will be called after specified period of the time or
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* triggered by the external event, this behavior depends on value of
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* the sample_rate this function will be called in user context. This
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* routine should return 0 if data was added to the buffer and
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* -ENODATA if none was available. This should add some number of bits
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* evenly divisible by code_length to the buffer
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*
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* rbuf:
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* if not NULL, it will be used as a read buffer, you will have to
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* write to the buffer by other means, like irq's (see also
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* lirc_serial.c).
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*
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* set_use_inc:
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* set_use_inc will be called after device is opened
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*
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* set_use_dec:
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* set_use_dec will be called after device is closed
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*
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* fops:
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* file_operations for drivers which don't fit the current driver model.
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*
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* Some ioctl's can be directly handled by lirc_dev if the driver's
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* ioctl function is NULL or if it returns -ENOIOCTLCMD (see also
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* lirc_serial.c).
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*
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* owner:
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* the module owning this struct
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*
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*/
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/* following functions can be called ONLY from user context
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*
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* returns negative value on error or minor number
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* of the registered device if success
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* contents of the structure pointed by p is copied
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*/
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extern int lirc_register_driver(struct lirc_driver *d);
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/* returns negative value on error or 0 if success
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*/
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extern int lirc_unregister_driver(int minor);
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/* Returns the private data stored in the lirc_driver
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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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ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer,
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size_t length, loff_t *ppos);
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#endif
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