ata: libata: Add ata_port_classify() helper

Add an ata_port_classify() helper to print out the results from
the device classification and remove the debugging statements
from ata_dev_classify().

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

8 files changed, 42 insertions, 21 deletions

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 94edbc89a48c..b7b460560a92 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1300,7 +1300,7 @@ unsigned int ahci_dev_classify(struct ata_port *ap)
 	tf.lbal		= (tmp >> 8)	& 0xff;
 	tf.nsect	= (tmp)		& 0xff;
 
-	return ata_dev_classify(&tf);
+	return ata_port_classify(ap, &tf);
 }
 EXPORT_SYMBOL_GPL(ahci_dev_classify);
 
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 72f56c32fe83..28645ac04d9f 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1007,32 +1007,21 @@ unsigned int ata_dev_classify(const struct ata_taskfile *tf)
 	 * SEMB signature.  This is worked around in
 	 * ata_dev_read_id().
 	 */
-	if ((tf->lbam == 0) && (tf->lbah == 0)) {
-		DPRINTK("found ATA device by sig\n");
+	if (tf->lbam == 0 && tf->lbah == 0)
 		return ATA_DEV_ATA;
-	}
 
-	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
-		DPRINTK("found ATAPI device by sig\n");
+	if (tf->lbam == 0x14 && tf->lbah == 0xeb)
 		return ATA_DEV_ATAPI;
-	}
 
-	if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
-		DPRINTK("found PMP device by sig\n");
+	if (tf->lbam == 0x69 && tf->lbah == 0x96)
 		return ATA_DEV_PMP;
-	}
 
-	if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
-		DPRINTK("found SEMB device by sig (could be ATA device)\n");
+	if (tf->lbam == 0x3c && tf->lbah == 0xc3)
 		return ATA_DEV_SEMB;
-	}
 
-	if ((tf->lbam == 0xcd) && (tf->lbah == 0xab)) {
-		DPRINTK("found ZAC device by sig\n");
+	if (tf->lbam == 0xcd && tf->lbah == 0xab)
 		return ATA_DEV_ZAC;
-	}
 
-	DPRINTK("unknown device\n");
 	return ATA_DEV_UNKNOWN;
 }
 EXPORT_SYMBOL_GPL(ata_dev_classify);
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 39c026f3948c..a119fabe0919 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -1853,7 +1853,7 @@ unsigned int ata_sff_dev_classify(struct ata_device *dev, int present,
 		return ATA_DEV_NONE;
 
 	/* determine if device is ATA or ATAPI */
-	class = ata_dev_classify(&tf);
+	class = ata_port_classify(ap, &tf);
 
 	if (class == ATA_DEV_UNKNOWN) {
 		/* If the device failed diagnostic, it's likely to
diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index 4162d625fc92..ca129854a88c 100644
--- a/drivers/ata/libata-transport.c
+++ b/drivers/ata/libata-transport.c
@@ -321,6 +321,36 @@ int ata_tport_add(struct device *parent,
 	return error;
 }
 
+/**
+ *     ata_port_classify - determine device type based on ATA-spec signature
+ *     @ap: ATA port device on which the classification should be run
+ *     @tf: ATA taskfile register set for device to be identified
+ *
+ *     A wrapper around ata_dev_classify() to provide additional logging
+ *
+ *     RETURNS:
+ *     Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP,
+ *     %ATA_DEV_ZAC, or %ATA_DEV_UNKNOWN the event of failure.
+ */
+unsigned int ata_port_classify(struct ata_port *ap,
+			       const struct ata_taskfile *tf)
+{
+	int i;
+	unsigned int class = ata_dev_classify(tf);
+
+	/* Start with index '1' to skip the 'unknown' entry */
+	for (i = 1; i < ARRAY_SIZE(ata_class_names); i++) {
+		if (ata_class_names[i].value == class) {
+			ata_port_dbg(ap, "found %s device by sig\n",
+				     ata_class_names[i].name);
+			return class;
+		}
+	}
+
+	ata_port_info(ap, "found unknown device (class %u)\n", class);
+	return class;
+}
+EXPORT_SYMBOL_GPL(ata_port_classify);
 
 /*
  * ATA link attributes
diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
index ec52511ae60f..7504d9fbff2a 100644
--- a/drivers/ata/sata_fsl.c
+++ b/drivers/ata/sata_fsl.c
@@ -814,7 +814,7 @@ static unsigned int sata_fsl_dev_classify(struct ata_port *ap)
 	tf.lbal = (temp >> 8) & 0xff;
 	tf.nsect = temp & 0xff;
 
-	return ata_dev_classify(&tf);
+	return ata_port_classify(ap, &tf);
 }
 
 static int sata_fsl_hardreset(struct ata_link *link, unsigned int *class,
diff --git a/drivers/ata/sata_inic162x.c b/drivers/ata/sata_inic162x.c
index e517bd8822a5..b6239dae524a 100644
--- a/drivers/ata/sata_inic162x.c
+++ b/drivers/ata/sata_inic162x.c
@@ -657,7 +657,7 @@ static int inic_hardreset(struct ata_link *link, unsigned int *class,
 		}
 
 		inic_tf_read(ap, &tf);
-		*class = ata_dev_classify(&tf);
+		*class = ata_port_classify(ap, &tf);
 	}
 
 	return 0;
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index f99ec6f7d7c0..7e9c1945dc81 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -680,7 +680,7 @@ static int sil24_softreset(struct ata_link *link, unsigned int *class,
 	}
 
 	sil24_read_tf(ap, 0, &tf);
-	*class = ata_dev_classify(&tf);
+	*class = ata_port_classify(ap, &tf);
 
 	DPRINTK("EXIT, class=%u\n", *class);
 	return 0;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 2a8404b26083..235fdbeb19ea 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1160,6 +1160,8 @@ extern enum ata_completion_errors ata_noop_qc_prep(struct ata_queued_cmd *qc);
 extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
 		 unsigned int n_elem);
 extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
+extern unsigned int ata_port_classify(struct ata_port *ap,
+				      const struct ata_taskfile *tf);
 extern void ata_dev_disable(struct ata_device *adev);
 extern void ata_id_string(const u16 *id, unsigned char *s,
 			  unsigned int ofs, unsigned int len);