diff options
Diffstat (limited to 'src/drivers/spi/spi-generic.c')
| -rw-r--r-- | src/drivers/spi/spi-generic.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/drivers/spi/spi-generic.c b/src/drivers/spi/spi-generic.c index 805e17af5a..579ceb1df7 100644 --- a/src/drivers/spi/spi-generic.c +++ b/src/drivers/spi/spi-generic.c @@ -88,6 +88,25 @@ int spi_xfer(const struct spi_slave *slave, const void *dout, size_t bytesout, return -1; } +unsigned int spi_crop_chunk(const struct spi_slave *slave, unsigned int cmd_len, + unsigned int buf_len) +{ + const struct spi_ctrlr *ctrlr = slave->ctrlr; + unsigned int ctrlr_max; + + if (!ctrlr) + return 0; + + ctrlr_max = ctrlr->max_xfer_size; + + assert (ctrlr_max != 0); + + if (ctrlr->deduct_cmd_len && (ctrlr_max > cmd_len)) + ctrlr_max -= cmd_len; + + return min(ctrlr_max, buf_len); +} + void __attribute__((weak)) spi_init(void) { /* Default weak implementation - do nothing. */ |