mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-03 15:47:36 +00:00
9eeee3b0bf
Currently IIO only supports buffer mode for capture devices like ADCs. Add support for buffered mode for output devices like DACs. The output buffer implementation is analogous to the input buffer implementation. Instead of using read() to get data from the buffer write() is used to copy data into the buffer. poll() with POLLOUT will wakeup if there is space available. Drivers can remove data from a buffer using iio_pop_from_buffer(), the function can e.g. called from a trigger handler to write the data to hardware. A buffer can only be either a output buffer or an input, but not both. So, for a device that has an ADC and DAC path, this will mean 2 IIO buffers (one for each direction). The direction of the buffer is decided by the new direction field of the iio_buffer struct and should be set after allocating and before registering it. Co-developed-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Co-developed-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Mihail Chindris <mihail.chindris@analog.com> Link: https://lore.kernel.org/r/20211007080035.2531-2-mihail.chindris@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/* The industrial I/O core function defs.
|
|
*
|
|
* Copyright (c) 2008 Jonathan Cameron
|
|
*
|
|
* These definitions are meant for use only within the IIO core, not individual
|
|
* drivers.
|
|
*/
|
|
|
|
#ifndef _IIO_CORE_H_
|
|
#define _IIO_CORE_H_
|
|
#include <linux/kernel.h>
|
|
#include <linux/device.h>
|
|
|
|
struct iio_buffer;
|
|
struct iio_chan_spec;
|
|
struct iio_dev;
|
|
|
|
extern struct device_type iio_device_type;
|
|
|
|
struct iio_dev_buffer_pair {
|
|
struct iio_dev *indio_dev;
|
|
struct iio_buffer *buffer;
|
|
};
|
|
|
|
#define IIO_IOCTL_UNHANDLED 1
|
|
struct iio_ioctl_handler {
|
|
struct list_head entry;
|
|
long (*ioctl)(struct iio_dev *indio_dev, struct file *filp,
|
|
unsigned int cmd, unsigned long arg);
|
|
};
|
|
|
|
long iio_device_ioctl(struct iio_dev *indio_dev, struct file *filp,
|
|
unsigned int cmd, unsigned long arg);
|
|
|
|
void iio_device_ioctl_handler_register(struct iio_dev *indio_dev,
|
|
struct iio_ioctl_handler *h);
|
|
void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h);
|
|
|
|
int __iio_add_chan_devattr(const char *postfix,
|
|
struct iio_chan_spec const *chan,
|
|
ssize_t (*func)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf),
|
|
ssize_t (*writefunc)(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len),
|
|
u64 mask,
|
|
enum iio_shared_by shared_by,
|
|
struct device *dev,
|
|
struct iio_buffer *buffer,
|
|
struct list_head *attr_list);
|
|
void iio_free_chan_devattr_list(struct list_head *attr_list);
|
|
|
|
int iio_device_register_sysfs_group(struct iio_dev *indio_dev,
|
|
const struct attribute_group *group);
|
|
|
|
ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals);
|
|
|
|
/* Event interface flags */
|
|
#define IIO_BUSY_BIT_POS 1
|
|
|
|
#ifdef CONFIG_IIO_BUFFER
|
|
struct poll_table_struct;
|
|
|
|
__poll_t iio_buffer_poll_wrapper(struct file *filp,
|
|
struct poll_table_struct *wait);
|
|
ssize_t iio_buffer_read_wrapper(struct file *filp, char __user *buf,
|
|
size_t n, loff_t *f_ps);
|
|
ssize_t iio_buffer_write_wrapper(struct file *filp, const char __user *buf,
|
|
size_t n, loff_t *f_ps);
|
|
|
|
int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev);
|
|
void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev);
|
|
|
|
#define iio_buffer_poll_addr (&iio_buffer_poll_wrapper)
|
|
#define iio_buffer_read_outer_addr (&iio_buffer_read_wrapper)
|
|
#define iio_buffer_write_outer_addr (&iio_buffer_write_wrapper)
|
|
|
|
void iio_disable_all_buffers(struct iio_dev *indio_dev);
|
|
void iio_buffer_wakeup_poll(struct iio_dev *indio_dev);
|
|
void iio_device_detach_buffers(struct iio_dev *indio_dev);
|
|
|
|
#else
|
|
|
|
#define iio_buffer_poll_addr NULL
|
|
#define iio_buffer_read_outer_addr NULL
|
|
#define iio_buffer_write_outer_addr NULL
|
|
|
|
static inline int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev) {}
|
|
|
|
static inline void iio_disable_all_buffers(struct iio_dev *indio_dev) {}
|
|
static inline void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) {}
|
|
static inline void iio_device_detach_buffers(struct iio_dev *indio_dev) {}
|
|
|
|
#endif
|
|
|
|
int iio_device_register_eventset(struct iio_dev *indio_dev);
|
|
void iio_device_unregister_eventset(struct iio_dev *indio_dev);
|
|
void iio_device_wakeup_eventset(struct iio_dev *indio_dev);
|
|
|
|
struct iio_event_interface;
|
|
bool iio_event_enabled(const struct iio_event_interface *ev_int);
|
|
|
|
#endif
|