[SCSI] libsas: sgpio write support
Add SFF-8485 v0.7 / SAS-1 smp-write-gpio register support to libsas.
Defer SAS-2 support unless/until it defines an sgpio interface.
Minimum implementation needed to get the lights blinking.
try_test_sas_gpio_gp_bit() provides a common method to parse the
incoming write data (raw bitstream), and the to_sas_gpio_gp_bit() helper
routine can be used as a basis for the set/clear operations for the
'read' implementation. Host implementations parse as many bits
(ODx.[012]) as are locally supported and report the number of registers
successfully written. If the submitted data overruns the internal
number of registers available report the write as a success with the
number of bytes remaining reported in ->resid_len.
Example (assuming an active backplane) set the "identify" pattern for
the first 21 devices:
smp_write_gpio --count=2 --data=92,49,24,92,24,92,49,24 -t 4 --index=1 /dev/bsg/sas_hostX
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 2517254..af0a1de 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -405,6 +405,13 @@
phy->linkrate = SAS_LINK_RATE_UNKNOWN;
}
+static inline unsigned int to_sas_gpio_od(int device, int bit)
+{
+ return 3 * device + bit;
+}
+
+int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count);
+
/* ---------- Tasks ---------- */
/*
service_response | SAS_TASK_COMPLETE | SAS_TASK_UNDELIVERED |
@@ -592,6 +599,10 @@
/* Phy management */
int (*lldd_control_phy)(struct asd_sas_phy *, enum phy_func, void *);
+
+ /* GPIO support */
+ int (*lldd_write_gpio)(struct sas_ha_struct *, u8 reg_type,
+ u8 reg_index, u8 reg_count, u8 *write_data);
};
extern int sas_register_ha(struct sas_ha_struct *);