diff options
Diffstat (limited to 'drivers/staging/iio/kfifo_buf.c')
-rw-r--r-- | drivers/staging/iio/kfifo_buf.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/drivers/staging/iio/kfifo_buf.c b/drivers/staging/iio/kfifo_buf.c deleted file mode 100644 index 9f3bd59c0e7..00000000000 --- a/drivers/staging/iio/kfifo_buf.c +++ /dev/null @@ -1,151 +0,0 @@ -#include <linux/slab.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/workqueue.h> -#include <linux/kfifo.h> -#include <linux/mutex.h> - -#include "kfifo_buf.h" - -struct iio_kfifo { - struct iio_buffer buffer; - struct kfifo kf; - int update_needed; -}; - -#define iio_to_kfifo(r) container_of(r, struct iio_kfifo, buffer) - -static inline int __iio_allocate_kfifo(struct iio_kfifo *buf, - int bytes_per_datum, int length) -{ - if ((length == 0) || (bytes_per_datum == 0)) - return -EINVAL; - - __iio_update_buffer(&buf->buffer, bytes_per_datum, length); - return kfifo_alloc(&buf->kf, bytes_per_datum*length, GFP_KERNEL); -} - -static int iio_request_update_kfifo(struct iio_buffer *r) -{ - int ret = 0; - struct iio_kfifo *buf = iio_to_kfifo(r); - - if (!buf->update_needed) - goto error_ret; - kfifo_free(&buf->kf); - ret = __iio_allocate_kfifo(buf, buf->buffer.bytes_per_datum, - buf->buffer.length); -error_ret: - return ret; -} - -static int iio_get_length_kfifo(struct iio_buffer *r) -{ - return r->length; -} - -static IIO_BUFFER_ENABLE_ATTR; -static IIO_BUFFER_LENGTH_ATTR; - -static struct attribute *iio_kfifo_attributes[] = { - &dev_attr_length.attr, - &dev_attr_enable.attr, - NULL, -}; - -static struct attribute_group iio_kfifo_attribute_group = { - .attrs = iio_kfifo_attributes, - .name = "buffer", -}; - -static int iio_get_bytes_per_datum_kfifo(struct iio_buffer *r) -{ - return r->bytes_per_datum; -} - -static int iio_mark_update_needed_kfifo(struct iio_buffer *r) -{ - struct iio_kfifo *kf = iio_to_kfifo(r); - kf->update_needed = true; - return 0; -} - -static int iio_set_bytes_per_datum_kfifo(struct iio_buffer *r, size_t bpd) -{ - if (r->bytes_per_datum != bpd) { - r->bytes_per_datum = bpd; - iio_mark_update_needed_kfifo(r); - } - return 0; -} - -static int iio_set_length_kfifo(struct iio_buffer *r, int length) -{ - if (r->length != length) { - r->length = length; - iio_mark_update_needed_kfifo(r); - } - return 0; -} - -static int iio_store_to_kfifo(struct iio_buffer *r, - u8 *data, - s64 timestamp) -{ - int ret; - struct iio_kfifo *kf = iio_to_kfifo(r); - ret = kfifo_in(&kf->kf, data, r->bytes_per_datum); - if (ret != r->bytes_per_datum) - return -EBUSY; - return 0; -} - -static int iio_read_first_n_kfifo(struct iio_buffer *r, - size_t n, char __user *buf) -{ - int ret, copied; - struct iio_kfifo *kf = iio_to_kfifo(r); - - if (n < r->bytes_per_datum) - return -EINVAL; - - n = rounddown(n, r->bytes_per_datum); - ret = kfifo_to_user(&kf->kf, buf, n, &copied); - - return copied; -} - -static const struct iio_buffer_access_funcs kfifo_access_funcs = { - .store_to = &iio_store_to_kfifo, - .read_first_n = &iio_read_first_n_kfifo, - .request_update = &iio_request_update_kfifo, - .get_bytes_per_datum = &iio_get_bytes_per_datum_kfifo, - .set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo, - .get_length = &iio_get_length_kfifo, - .set_length = &iio_set_length_kfifo, -}; - -struct iio_buffer *iio_kfifo_allocate(struct iio_dev *indio_dev) -{ - struct iio_kfifo *kf; - - kf = kzalloc(sizeof *kf, GFP_KERNEL); - if (!kf) - return NULL; - kf->update_needed = true; - iio_buffer_init(&kf->buffer); - kf->buffer.attrs = &iio_kfifo_attribute_group; - kf->buffer.access = &kfifo_access_funcs; - - return &kf->buffer; -} -EXPORT_SYMBOL(iio_kfifo_allocate); - -void iio_kfifo_free(struct iio_buffer *r) -{ - kfree(iio_to_kfifo(r)); -} -EXPORT_SYMBOL(iio_kfifo_free); - -MODULE_LICENSE("GPL"); |