[SCSI] qla2xxx: Add I2C BSG interface.

Add BSG interface to generically access I2C attached devices.

Signed-off-by: Joe Carnuccio <joe.carnuccio@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 106 insertions, 0 deletions

diff --git a/drivers/scsi/qla2xxx/qla_bsg.c b/drivers/scsi/qla2xxx/qla_bsg.c
index c68883806c54..462ac707b8d6 100644
--- a/drivers/scsi/qla2xxx/qla_bsg.c
+++ b/drivers/scsi/qla2xxx/qla_bsg.c
@@ -1560,6 +1560,96 @@ done:
 }
 
 static int
+qla2x00_write_i2c(struct fc_bsg_job *bsg_job)
+{
+        struct Scsi_Host *host = bsg_job->shost;
+        scsi_qla_host_t *vha = shost_priv(host);
+        struct qla_hw_data *ha = vha->hw;
+        int rval = 0;
+        uint8_t bsg[DMA_POOL_SIZE];
+        struct qla_i2c_access *i2c = (void *)bsg;
+        dma_addr_t sfp_dma;
+        uint8_t *sfp = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL, &sfp_dma);
+        if (!sfp) {
+                bsg_job->reply->reply_data.vendor_reply.vendor_rsp[0] =
+                    EXT_STATUS_NO_MEMORY;
+                goto done;
+        }
+
+        sg_copy_to_buffer(bsg_job->request_payload.sg_list,
+            bsg_job->request_payload.sg_cnt, i2c, sizeof(*i2c));
+
+        memcpy(sfp, i2c->buffer, i2c->length);
+        rval = qla2x00_write_sfp(vha, sfp_dma, sfp,
+            i2c->device, i2c->offset, i2c->length, i2c->option);
+
+        if (rval) {
+                bsg_job->reply->reply_data.vendor_reply.vendor_rsp[0] =
+                    EXT_STATUS_MAILBOX;
+                goto dealloc;
+        }
+
+        bsg_job->reply->reply_data.vendor_reply.vendor_rsp[0] = 0;
+
+dealloc:
+        dma_pool_free(ha->s_dma_pool, sfp, sfp_dma);
+
+done:
+        bsg_job->reply_len = sizeof(struct fc_bsg_reply);
+        bsg_job->reply->result = DID_OK << 16;
+        bsg_job->job_done(bsg_job);
+
+        return 0;
+}
+
+static int
+qla2x00_read_i2c(struct fc_bsg_job *bsg_job)
+{
+        struct Scsi_Host *host = bsg_job->shost;
+        scsi_qla_host_t *vha = shost_priv(host);
+        struct qla_hw_data *ha = vha->hw;
+        int rval = 0;
+        uint8_t bsg[DMA_POOL_SIZE];
+        struct qla_i2c_access *i2c = (void *)bsg;
+        dma_addr_t sfp_dma;
+        uint8_t *sfp = dma_pool_alloc(ha->s_dma_pool, GFP_KERNEL, &sfp_dma);
+        if (!sfp) {
+                bsg_job->reply->reply_data.vendor_reply.vendor_rsp[0] =
+                    EXT_STATUS_NO_MEMORY;
+                goto done;
+        }
+
+        sg_copy_to_buffer(bsg_job->request_payload.sg_list,
+            bsg_job->request_payload.sg_cnt, i2c, sizeof(*i2c));
+
+        rval = qla2x00_read_sfp(vha, sfp_dma, sfp,
+                i2c->device, i2c->offset, i2c->length, i2c->option);
+
+        if (rval) {
+                bsg_job->reply->reply_data.vendor_reply.vendor_rsp[0] =
+                    EXT_STATUS_MAILBOX;
+                goto dealloc;
+        }
+
+        memcpy(i2c->buffer, sfp, i2c->length);
+        sg_copy_from_buffer(bsg_job->reply_payload.sg_list,
+            bsg_job->reply_payload.sg_cnt, i2c, sizeof(*i2c));
+
+        bsg_job->reply->reply_data.vendor_reply.vendor_rsp[0] = 0;
+
+dealloc:
+        dma_pool_free(ha->s_dma_pool, sfp, sfp_dma);
+
+done:
+        bsg_job->reply_len = sizeof(struct fc_bsg_reply);
+        bsg_job->reply->reply_payload_rcv_len = sizeof(*i2c);
+        bsg_job->reply->result = DID_OK << 16;
+        bsg_job->job_done(bsg_job);
+
+        return 0;
+}
+
+static int
 qla2x00_process_vendor_specific(struct fc_bsg_job *bsg_job)
 {
         switch (bsg_job->request->rqst_data.h_vendor.vendor_cmd[0]) {
@@ -1596,6 +1686,12 @@ qla2x00_process_vendor_specific(struct fc_bsg_job *bsg_job)
         case QL_VND_WRITE_FRU_STATUS:
                 return qla2x00_write_fru_status(bsg_job);
 
+        case QL_VND_WRITE_I2C:
+                return qla2x00_write_i2c(bsg_job);
+
+        case QL_VND_READ_I2C:
+                return qla2x00_read_i2c(bsg_job);
+
         default:
                 bsg_job->reply->result = (DID_ERROR << 16);
                 bsg_job->job_done(bsg_job);
diff --git a/drivers/scsi/qla2xxx/qla_bsg.h b/drivers/scsi/qla2xxx/qla_bsg.h
index 70caa63a8930..1a0ab375ce43 100644
--- a/drivers/scsi/qla2xxx/qla_bsg.h
+++ b/drivers/scsi/qla2xxx/qla_bsg.h
@@ -19,6 +19,8 @@
 #define QL_VND_SET_FRU_VERSION  0x0B
 #define QL_VND_READ_FRU_STATUS  0x0C
 #define QL_VND_WRITE_FRU_STATUS 0x0D
+#define QL_VND_WRITE_I2C        0x10
+#define QL_VND_READ_I2C         0x11
 
 /* BSG Vendor specific subcode returns */
 #define EXT_STATUS_OK                   0
@@ -183,4 +185,12 @@ struct qla_status_reg {
         uint8_t reserved[7];
 } __packed;
 
+struct qla_i2c_access {
+        uint16_t device;
+        uint16_t offset;
+        uint16_t option;
+        uint16_t length;
+        uint8_t  buffer[0x40];
+} __packed;
+
 #endif