[SCSI] aic7xxx: expose the bus setting to sysfs
Read the transciever register and display in the host transport
properties. I'm still not entirely sure what this does for multiple
transciever adapters (like some 160 ones) however, I suspect it
displays the transciever state of the switchable bus segment.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index eadfefd..debf3e2 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -2537,6 +2537,22 @@
}
#endif
+static void ahc_linux_get_signalling(struct Scsi_Host *shost)
+{
+ struct ahc_softc *ahc = *(struct ahc_softc **)shost->hostdata;
+ u8 mode = ahc_inb(ahc, SBLKCTL);
+
+ if (mode & ENAB40)
+ spi_signalling(shost) = SPI_SIGNAL_LVD;
+ else if (mode & ENAB20)
+ spi_signalling(shost) =
+ ahc->features & AHC_HVD ?
+ SPI_SIGNAL_HVD :
+ SPI_SIGNAL_SE;
+ else
+ spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
+}
+
static struct spi_function_template ahc_linux_transport_functions = {
.set_offset = ahc_linux_set_offset,
.show_offset = 1,
@@ -2552,6 +2568,7 @@
.set_qas = ahc_linux_set_qas,
.show_qas = 1,
#endif
+ .get_signalling = ahc_linux_get_signalling,
};