Revert "ft2232_spi: Enhance csgpiol parameter for FT2232"

This reverts commit ba6575de82f091b97ea0f2efcf2f79ef3739d64f.

Technically, the only thing that is wrong here is the lack of docu-
mentation (manpage update). However, as this change was succeeded by
a regressing fixup patch, it seems likely that the meaning of the
`csgpiol` parameter was just misunderstood and these changes were
not what the author intended.

Change-Id: I460237b9d275b1cd1d8a069f852d17dea393b14e
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/55694
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 14 insertions, 26 deletions

diff --git a/ft2232_spi.c b/ft2232_spi.c
index 44975db35..eb989331a 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -88,17 +88,10 @@ static const struct dev_entry devs_ft2232spi[] = {
 
 /* The variables cs_bits and pindir store the values for the "set data bits low byte" MPSSE command that
  * sets the initial state and the direction of the I/O pins. The pin offsets are as follows:
- * TCK/SK is bit 0.
- * TDI/DO is bit 1.
- * TDO/DI is bit 2.
- * TMS/CS is bit 3.
- * GPIOL0 is bit 4.
- * GPIOL1 is bit 5.
- * GPIOL2 is bit 6.
- * GPIOL3 is bit 7.
- *
- * The pin signal direction bit offsets follow the same order; 0 means that
- * pin at the matching bit index is an input, 1 means pin is an output.
+ * SCK is bit 0.
+ * DO  is bit 1.
+ * DI  is bit 2.
+ * CS  is bit 3.
  *
  * The default values (set below in ft2232_spi_init) are used for most devices:
  *  value: 0x08  CS=high, DI=low, DO=low, SK=low
@@ -459,24 +452,19 @@ static int ft2232_spi_init(void)
 	}
 	free(arg);
 
-	/* Allows setting multiple GPIOL states, for example: csgpiol=012 */
 	arg = extract_programmer_param("csgpiol");
 	if (arg) {
-		unsigned int ngpios = strlen(arg);
-		for (unsigned int i = 0; i <= ngpios; i++) {
-			int temp = arg[i] - '0';
-			if (ngpios == 0 || (ngpios != i && (temp < 0 || temp > 3))) {
-				msg_perr("Error: Invalid GPIOLs specified: \"%s\".\n"
-					 "Valid values are numbers between 0 and 3. "
-					 "Multiple GPIOLs can be specified.\n", arg);
-				free(arg);
-				return -2;
-			} else {
-				unsigned int pin = temp + 4;
-				cs_bits |= 1 << pin;
-				pindir |= 1 << pin;
-			}
+		char *endptr;
+		unsigned int temp = strtoul(arg, &endptr, 10);
+		if (*endptr || endptr == arg || temp > 3) {
+			msg_perr("Error: Invalid GPIOL specified: \"%s\".\n"
+				 "Valid values are between 0 and 3.\n", arg);
+			free(arg);
+			return -2;
 		}
+		unsigned int pin = temp + 4;
+		cs_bits |= 1 << pin;
+		pindir |= 1 << pin;
 	}
 	free(arg);