* Influenced by code from:
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
if (!spi_cs_is_valid(bus, cs))
return NULL;
- ss = malloc(sizeof(struct soft_spi_slave));
+ ss = spi_alloc_slave(struct soft_spi_slave, bus, cs);
if (!ss)
return NULL;
- ss->slave.bus = bus;
- ss->slave.cs = cs;
ss->mode = mode;
/* TODO: Use max_hz to limit the SCK rate */
/*
* Check if it is time to work on a new byte.
*/
- if((j % 8) == 0) {
- tmpdout = *txd++;
+ if ((j % 8) == 0) {
+ if (txd)
+ tmpdout = *txd++;
+ else
+ tmpdout = 0;
if(j != 0) {
- *rxd++ = tmpdin;
+ if (rxd)
+ *rxd++ = tmpdin;
}
tmpdin = 0;
}
* bits over to left-justify them. Then store the last byte
* read in.
*/
- if((bitlen % 8) != 0)
- tmpdin <<= 8 - (bitlen % 8);
- *rxd++ = tmpdin;
+ if (rxd) {
+ if ((bitlen % 8) != 0)
+ tmpdin <<= 8 - (bitlen % 8);
+ *rxd++ = tmpdin;
+ }
if (flags & SPI_XFER_END)
spi_cs_deactivate(slave);