diff options
author | Ian Abbott <abbotti@mev.co.uk> | 2014-09-15 12:46:03 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-19 22:55:31 (GMT) |
commit | ea29c1d563a4d57db1c2955c22468a0947f110b0 (patch) | |
tree | 10c485e9c5f4123c88423332d0c909337f96663d /drivers/staging/comedi/comedi_buf.c | |
parent | 5c520aafa0cb234a9124569f742e82d04ab5006b (diff) | |
download | linux-ea29c1d563a4d57db1c2955c22468a0947f110b0.tar.xz |
staging: comedi: add comedi_write_array_to_buffer()
The "comedi_fc" module contains a few functions useful to Comedi
drivers. Their functionality is being migrated to the core "comedi"
module and renamed to start with the prefix `comedi_`. As part of this
migration, move `cfc_write_array_to_buffer()` into the core comedi
module and rename it to `comedi_write_array_to_buffer()`. Change the
external declaration of `cfc_write_array_to_buffer()` into an inline
function that calls `comedi_write_array_to_buffer()`.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/comedi_buf.c')
-rw-r--r-- | drivers/staging/comedi/comedi_buf.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c index df4a9c4..5aa8684 100644 --- a/drivers/staging/comedi/comedi_buf.c +++ b/drivers/staging/comedi/comedi_buf.c @@ -509,3 +509,30 @@ void comedi_buf_memcpy_from(struct comedi_subdevice *s, unsigned int offset, } } EXPORT_SYMBOL_GPL(comedi_buf_memcpy_from); + +/* Writes an array of data points to comedi's buffer */ +unsigned int comedi_write_array_to_buffer(struct comedi_subdevice *s, + const void *data, + unsigned int num_bytes) +{ + struct comedi_async *async = s->async; + unsigned int retval; + + if (num_bytes == 0) + return 0; + + retval = comedi_buf_write_alloc(s, num_bytes); + if (retval != num_bytes) { + dev_warn(s->device->class_dev, "buffer overrun\n"); + async->events |= COMEDI_CB_OVERFLOW; + return 0; + } + + comedi_buf_memcpy_to(s, 0, data, num_bytes); + comedi_buf_write_free(s, num_bytes); + comedi_inc_scan_progress(s, num_bytes); + async->events |= COMEDI_CB_BLOCK; + + return num_bytes; +} +EXPORT_SYMBOL_GPL(comedi_write_array_to_buffer); |