[flashrom] [PATCH] linux_spi.c: set SPI mode, bit order and bits per word on init.

[Stefan Tauner]

Previously we relied on a correctly set up state.

Also, we start to rely on the shutdown function for cleanup after
registering it, i.e. we no longer explicitly call close(fd) after
register_shutdown().

Signed-off-by: Stefan Tauner 
---
 linux_spi.c |   22 +++++++++++++++++++---
 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);