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-rw-r--r--linux_spi.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/linux_spi.c b/linux_spi.c
index d994389..2ae681f 100644
--- a/linux_spi.c
+++ b/linux_spi.c
@@ -57,6 +57,10 @@ int linux_spi_init(void)
{
char *p, *endp, *dev;
uint32_t speed = 0;
+ /* FIXME: make the following configurable by CLI options. */
+ /* SPI mode 0 (beware this also includes: MSB first, CS active low and others */
+ const uint8_t mode = SPI_MODE_0;
+ const uint8_t bits = 8;
dev = extract_programmer_param("dev");
if (!dev || !strlen(dev)) {
@@ -81,19 +85,31 @@ int linux_spi_init(void)
return 1;
}
+ if (register_shutdown(linux_spi_shutdown, NULL))
+ return 1;
+ /* We rely on the shutdown function for cleanup from here on. */
+
if (speed > 0) {
if (ioctl(fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed) == -1) {
- msg_perr("%s: failed to set speed %dHz: %s\n",
+ msg_perr("%s: failed to set speed to %d Hz: %s\n",
__func__, speed, strerror(errno));
- close(fd);
return 1;
}
msg_pdbg("Using %d kHz clock\n", speed);
}
- if (register_shutdown(linux_spi_shutdown, NULL))
+ if (ioctl(fd, SPI_IOC_WR_MODE, &mode) == -1) {
+ msg_perr("%s: failed to set SPI mode to 0x%02x: %s\n",
+ __func__, mode, strerror(errno));
return 1;
+ }
+
+ if (ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits) == -1) {
+ msg_perr("%s: failed to set the number of bits per SPI word to %u: %s\n",
+ __func__, bits == 0 ? 8 : bits, strerror(errno));
+ return 1;
+ }
register_spi_programmer(&spi_programmer_linux);
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