[PATCH] linux_spi: add handling of suffices M and K in spispeed value

[Joerg Albert]

This patch adds correct handling of the suffices M,m,K,k for the spispeed
value (K,k don't change anything). Drop an error for any other suffix.

Change-Id: Ideb2295df8e82ccb2bbe2d58a6ee035b2ea602d0
Signed-Off-By: Joerg Albert 
---
 flashrom.8.tmpl |  4 ++++
 linux_spi.c     | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/flashrom.8.tmpl b/flashrom.8.tmpl
index a3528f1..642a697 100644
--- a/flashrom.8.tmpl
+++ b/flashrom.8.tmpl
@@ -1032,6 +1032,10 @@ Example that sets the frequency to 8 MHz:
 .sp
 .B "  flashrom -p linux_spi:dev=/dev/spidevX.Y,spispeed=8000"
 .sp
+or
+.sp
+.B "  flashrom -p linux_spi:dev=/dev/spidevX.Y,spispeed=8M"
+.sp
 Please note that the linux_spi driver only works on Linux.
 .SS
 .BR "mstarddc_spi " programmer
diff --git a/linux_spi.c b/linux_spi.c
index 3e60492..1f3632b 100644
--- a/linux_spi.c
+++ b/linux_spi.c
@@ -80,6 +80,25 @@ int linux_spi_init(void)
                        free(p);
                        return 1;
                }
+               if (strlen(endp) == 1) {
+                       if (toupper(*endp) == 'M') {
+                               speed_hz *= 1000;
+                       } else {
+                               if (toupper(*endp) == 'K') {
+                                       ;
+                               } else {
+                                 msg_perr("Error: Garbage following 'spispeed' value: %s\n", p);
+                                       free(p);
+                                       return 1;
+                               }
+                       }
+               } else {
+                       if (strlen(endp) > 1) {
+                         msg_perr("Error: Garbage following 'spispeed' value: %s\n", p);
+                               free(p);
+                               return 1;
+                       }
+               }
        }
        free(p);