mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Mauro Carvalho Chehab](/assets/img/avatar_default.png)
The kernel-doc script is now broken if it doesn't find all exported symbols documented. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
238 lines
6.6 KiB
C
238 lines
6.6 KiB
C
/*
|
|
* 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 MAX_IRCTL_DEVICES 8
|
|
#define BUFLEN 16
|
|
|
|
#define mod(n, div) ((n) % (div))
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/ioctl.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/kfifo.h>
|
|
#include <media/lirc.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 int lirc_buffer_available(struct lirc_buffer *buf)
|
|
{
|
|
return buf->size - (lirc_buffer_len(buf) / buf->chunk_size);
|
|
}
|
|
|
|
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_driver - Defines the parameters on a LIRC driver
|
|
*
|
|
* @name: this string will be used for logs
|
|
*
|
|
* @minor: indicates minor device (/dev/lirc) number for
|
|
* registered driver if caller fills it with negative
|
|
* value, then the first free minor number will be used
|
|
* (if available).
|
|
*
|
|
* @code_length: length of the remote control key code expressed in bits.
|
|
*
|
|
* @buffer_size: Number of FIFO buffers with @chunk_size size. If zero,
|
|
* creates a buffer with BUFLEN size (16 bytes).
|
|
*
|
|
* @sample_rate: if zero, the device will wait for an event with a new
|
|
* code to be parsed. Otherwise, specifies the sample
|
|
* rate for polling. Value should be between 0
|
|
* and HZ. If equal to HZ, it would mean one polling per
|
|
* second.
|
|
*
|
|
* @features: lirc compatible hardware features, like LIRC_MODE_RAW,
|
|
* LIRC_CAN\_\*, as defined at include/media/lirc.h.
|
|
*
|
|
* @chunk_size: Size of each FIFO buffer.
|
|
*
|
|
* @data: it may point to any driver data and this pointer will
|
|
* be passed to all callback functions.
|
|
*
|
|
* @min_timeout: Minimum timeout for record. Valid only if
|
|
* LIRC_CAN_SET_REC_TIMEOUT is defined.
|
|
*
|
|
* @max_timeout: Maximum timeout for record. Valid only if
|
|
* LIRC_CAN_SET_REC_TIMEOUT is defined.
|
|
*
|
|
* @add_to_buf: add_to_buf will be called after specified period of the
|
|
* time or triggered by the external event, this behavior
|
|
* depends on value of the sample_rate this function will
|
|
* be called in user context. This routine should return
|
|
* 0 if data was added to the buffer and -ENODATA if none
|
|
* was available. This should add some number of bits
|
|
* evenly divisible by code_length to the buffer.
|
|
*
|
|
* @rbuf: if not NULL, it will be used as a read buffer, you will
|
|
* have to write to the buffer by other means, like irq's
|
|
* (see also lirc_serial.c).
|
|
*
|
|
* @set_use_inc: set_use_inc will be called after device is opened
|
|
*
|
|
* @set_use_dec: set_use_dec will be called after device is closed
|
|
*
|
|
* @rdev: Pointed to struct rc_dev associated with the LIRC
|
|
* device.
|
|
*
|
|
* @fops: file_operations for drivers which don't fit the current
|
|
* driver model.
|
|
* Some ioctl's can be directly handled by lirc_dev if the
|
|
* driver's ioctl function is NULL or if it returns
|
|
* -ENOIOCTLCMD (see also lirc_serial.c).
|
|
*
|
|
* @dev: pointer to the struct device associated with the LIRC
|
|
* device.
|
|
*
|
|
* @owner: the module owning this struct
|
|
*/
|
|
struct lirc_driver {
|
|
char name[40];
|
|
int minor;
|
|
__u32 code_length;
|
|
unsigned int buffer_size; /* in chunks holding one code each */
|
|
int sample_rate;
|
|
__u32 features;
|
|
|
|
unsigned int chunk_size;
|
|
|
|
void *data;
|
|
int min_timeout;
|
|
int max_timeout;
|
|
int (*add_to_buf)(void *data, struct lirc_buffer *buf);
|
|
struct lirc_buffer *rbuf;
|
|
int (*set_use_inc)(void *data);
|
|
void (*set_use_dec)(void *data);
|
|
struct rc_dev *rdev;
|
|
const struct file_operations *fops;
|
|
struct device *dev;
|
|
struct module *owner;
|
|
};
|
|
|
|
/* following functions can be called ONLY from user context
|
|
*
|
|
* returns negative value on error or minor number
|
|
* of the registered device if success
|
|
* contents of the structure pointed by p is copied
|
|
*/
|
|
extern int lirc_register_driver(struct lirc_driver *d);
|
|
|
|
/* returns negative value on error or 0 if success
|
|
*/
|
|
extern int lirc_unregister_driver(int minor);
|
|
|
|
/* Returns the private data stored in the lirc_driver
|
|
* 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);
|
|
ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer,
|
|
size_t length, loff_t *ppos);
|
|
|
|
#endif
|