linux/drivers/iio/buffer_cb.c
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   1#include <linux/kernel.h>
   2#include <linux/slab.h>
   3#include <linux/err.h>
   4#include <linux/export.h>
   5#include <linux/iio/buffer.h>
   6#include <linux/iio/consumer.h>
   7
   8struct iio_cb_buffer {
   9        struct iio_buffer buffer;
  10        int (*cb)(u8 *data, void *private);
  11        void *private;
  12        struct iio_channel *channels;
  13};
  14
  15static int iio_buffer_cb_store_to(struct iio_buffer *buffer, u8 *data)
  16{
  17        struct iio_cb_buffer *cb_buff = container_of(buffer,
  18                                                     struct iio_cb_buffer,
  19                                                     buffer);
  20
  21        return cb_buff->cb(data, cb_buff->private);
  22}
  23
  24static struct iio_buffer_access_funcs iio_cb_access = {
  25        .store_to = &iio_buffer_cb_store_to,
  26};
  27
  28struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
  29                                             int (*cb)(u8 *data,
  30                                                       void *private),
  31                                             void *private)
  32{
  33        int ret;
  34        struct iio_cb_buffer *cb_buff;
  35        struct iio_dev *indio_dev;
  36        struct iio_channel *chan;
  37
  38        cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
  39        if (cb_buff == NULL) {
  40                ret = -ENOMEM;
  41                goto error_ret;
  42        }
  43
  44        cb_buff->private = private;
  45        cb_buff->cb = cb;
  46        cb_buff->buffer.access = &iio_cb_access;
  47        INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
  48
  49        cb_buff->channels = iio_channel_get_all(dev);
  50        if (IS_ERR(cb_buff->channels)) {
  51                ret = PTR_ERR(cb_buff->channels);
  52                goto error_free_cb_buff;
  53        }
  54
  55        indio_dev = cb_buff->channels[0].indio_dev;
  56        cb_buff->buffer.scan_mask
  57                = kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
  58                          GFP_KERNEL);
  59        if (cb_buff->buffer.scan_mask == NULL) {
  60                ret = -ENOMEM;
  61                goto error_release_channels;
  62        }
  63        chan = &cb_buff->channels[0];
  64        while (chan->indio_dev) {
  65                if (chan->indio_dev != indio_dev) {
  66                        ret = -EINVAL;
  67                        goto error_free_scan_mask;
  68                }
  69                set_bit(chan->channel->scan_index,
  70                        cb_buff->buffer.scan_mask);
  71                chan++;
  72        }
  73
  74        return cb_buff;
  75
  76error_free_scan_mask:
  77        kfree(cb_buff->buffer.scan_mask);
  78error_release_channels:
  79        iio_channel_release_all(cb_buff->channels);
  80error_free_cb_buff:
  81        kfree(cb_buff);
  82error_ret:
  83        return ERR_PTR(ret);
  84}
  85EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
  86
  87int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
  88{
  89        return iio_update_buffers(cb_buff->channels[0].indio_dev,
  90                                  &cb_buff->buffer,
  91                                  NULL);
  92}
  93EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
  94
  95void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
  96{
  97        iio_update_buffers(cb_buff->channels[0].indio_dev,
  98                           NULL,
  99                           &cb_buff->buffer);
 100}
 101EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
 102
 103void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
 104{
 105        kfree(cb_buff->buffer.scan_mask);
 106        iio_channel_release_all(cb_buff->channels);
 107        kfree(cb_buff);
 108}
 109EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
 110
 111struct iio_channel
 112*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
 113{
 114        return cb_buffer->channels;
 115}
 116EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);
 117
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