From: Elias Oltmanns <eo@nebensachen.de>
Date: Fri, 19 Sep 2008 21:46:01 +0000 (+0200)
Subject: [libata] Introduce ata_id_has_unload()
X-Git-Tag: v2.6.28-rc1~736^2~7
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ea6ce53cd5d005455ec0a3cc1d45d3af0cb90919;p=linux-2.6-omap-h63xx.git

[libata] Introduce ata_id_has_unload()

Add a function to check an ATA device's id for head unload support as
specified in ATA-7.

Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---

diff --git a/include/linux/ata.h b/include/linux/ata.h
index 8a12d718c16..a26ebd25bac 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -667,6 +667,15 @@ static inline int ata_id_has_dword_io(const u16 *id)
 	return 0;
 }
 
+static inline int ata_id_has_unload(const u16 *id)
+{
+	if (ata_id_major_version(id) >= 7 &&
+	    (id[ATA_ID_CFSSE] & 0xC000) == 0x4000 &&
+	    id[ATA_ID_CFSSE] & (1 << 13))
+		return 1;
+	return 0;
+}
+
 static inline int ata_id_current_chs_valid(const u16 *id)
 {
 	/* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command