linux-kernel - [PATCH 1/4] Introduce ata_id_has

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Message-ID: <20080829211345.4355.63012.stgit@denkblock.local>
Date:	Fri, 29 Aug 2008 23:16:47 +0200
From:	Elias Oltmanns <eo@...ensachen.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jeff@...zik.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Tejun Heo <htejun@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] 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@...ensachen.de>
---

 include/linux/ata.h |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/include/linux/ata.h b/include/linux/ata.h
index 80364b6..d9a94bd 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -707,6 +707,23 @@ static inline int ata_id_has_dword_io(const u16 *id)
 	return 0;
 }
 
+static inline int ata_id_has_unload(const u16 *id)
+{
+	/*
+	 * ATA-7 specifies two places to indicate unload feature
+	 * support. Since I don't really understand the difference,
+	 * I'll just check both and only return zero if none of them
+	 * indicates otherwise.
+	 */
+	if (ata_id_major_version(id) >= 7
+	    && (((id[ATA_ID_CFSSE] & 0xC000) == 0x4000
+		 && id[ATA_ID_CFSSE] & (1 << 13))
+		|| ((id[ATA_ID_CSF_DEFAULT] & 0xC000) == 0x4000
+		    && (id[ATA_ID_CSF_DEFAULT] & (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


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