1 files changed, 96 insertions, 0 deletions

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 7b740fe1721b..f2fd0dda70f2 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -600,3 +600,99 @@ int ata_acpi_exec_tfs(struct ata_port *ap)
         return ret;
 }
 
+/**
+ * ata_acpi_push_id - send Identify data to drive
+ * @ap: the ata_port for the drive
+ * @ix: drive index
+ *
+ * _SDD ACPI object: for SATA mode only
+ * Must be after Identify (Packet) Device -- uses its data
+ * ATM this function never returns a failure.  It is an optional
+ * method and if it fails for whatever reason, we should still
+ * just keep going.
+ */
+int ata_acpi_push_id(struct ata_port *ap, unsigned int ix)
+{
+        acpi_handle                     handle;
+        acpi_integer                    pcidevfn;
+        int                             err;
+        struct device                   *dev = ap->host->dev;
+        struct ata_device               *atadev = &ap->device[ix];
+        u32                             dev_adr;
+        acpi_status                     status;
+        struct acpi_object_list         input;
+        union acpi_object               in_params[1];
+
+        if (noacpi)
+                return 0;
+
+        if (ata_msg_probe(ap))
+                ata_dev_printk(atadev, KERN_DEBUG,
+                        "%s: ap->id: %d, ix = %d, port#: %d\n",
+                        __FUNCTION__, ap->id, ix, ap->port_no);
+
+        /* Don't continue if not a SATA device. */
+        if (!(ap->cbl == ATA_CBL_SATA)) {
+                if (ata_msg_probe(ap))
+                        ata_dev_printk(atadev, KERN_DEBUG,
+                                "%s: Not a SATA device\n", __FUNCTION__);
+                goto out;
+        }
+
+        /* Don't continue if device has no _ADR method.
+         * _SDD is intended for known motherboard devices. */
+        err = sata_get_dev_handle(dev, &handle, &pcidevfn);
+        if (err < 0) {
+                if (ata_msg_probe(ap))
+                        ata_dev_printk(atadev, KERN_DEBUG,
+                                "%s: sata_get_dev_handle failed (%d\n",
+                                __FUNCTION__, err);
+                goto out;
+        }
+
+        /* Get this drive's _ADR info, if not already known */
+        if (!atadev->obj_handle) {
+                dev_adr = SATA_ADR_RSVD;
+                err = get_sata_adr(dev, handle, pcidevfn, ix, ap, atadev,
+                                        &dev_adr);
+                if (err < 0 || dev_adr == SATA_ADR_RSVD ||
+                        !atadev->obj_handle) {
+                        if (ata_msg_probe(ap))
+                                ata_dev_printk(atadev, KERN_DEBUG,
+                                        "%s: get_sata_adr failed: "
+                                        "err=%d, dev_adr=%u, obj_handle=0x%p\n",
+                                        __FUNCTION__, err, dev_adr,
+                                        atadev->obj_handle);
+                        goto out;
+                }
+        }
+
+        /* Give the drive Identify data to the drive via the _SDD method */
+        /* _SDD: set up input parameters */
+        input.count = 1;
+        input.pointer = in_params;
+        in_params[0].type = ACPI_TYPE_BUFFER;
+        in_params[0].buffer.length = sizeof(atadev->id[0] * ATA_ID_WORDS);
+        in_params[0].buffer.pointer = (u8 *)atadev->id;
+        /* Output buffer: _SDD has no output */
+
+        /* It's OK for _SDD to be missing too. */
+        swap_buf_le16(atadev->id, ATA_ID_WORDS);
+        status = acpi_evaluate_object(atadev->obj_handle, "_SDD", &input, NULL);
+        swap_buf_le16(atadev->id, ATA_ID_WORDS);
+
+        err = ACPI_FAILURE(status) ? -EIO : 0;
+        if (err < 0) {
+                if (ata_msg_probe(ap))
+                        ata_dev_printk(atadev, KERN_DEBUG,
+                                "ata%u(%u): %s _SDD error: status = 0x%x\n",
+                                ap->id, ap->device->devno,
+                                __FUNCTION__, status);
+        }
+
+        /* always return success */
+out:
+        return 0;
+}
+
+