From 3bdbb62fe97537252b22f700009863eeb51aa750 Mon Sep 17 00:00:00 2001
From: Alexandre Bounine <alexandre.bounine@idt.com>
Date: Wed, 3 Jul 2013 15:08:58 -0700
Subject: rapidio: add udev notification

Add RapidIO-specific modalias generation to enable udev notifications
about RapidIO-specific events.

The RapidIO modalias string format is shown below:

"rapidio:vNNNNdNNNNavNNNNadNNNN"

Where:
v  - Device Vendor ID (16 bit),
d  - Device ID (16 bit),
av - Assembly Vendor ID (16 bit),
ad - Assembly ID (16 bit),

as they are reported in corresponding Capability Registers (CARs)
of each RapidIO device.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Li Yang <leoli@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Andre van Herk <andre.van.herk@Prodrive.nl>
Cc: Micha Nelissen <micha.nelissen@Prodrive.nl>
Cc: Stef van Os <stef.van.os@Prodrive.nl>
Cc: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 drivers/rapidio/rio-sysfs.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'drivers/rapidio/rio-sysfs.c')

diff --git a/drivers/rapidio/rio-sysfs.c b/drivers/rapidio/rio-sysfs.c
index 0c4473e54f86..9331be646dc3 100644
--- a/drivers/rapidio/rio-sysfs.c
+++ b/drivers/rapidio/rio-sysfs.c
@@ -84,6 +84,15 @@ static ssize_t lnext_show(struct device *dev,
 	return str - buf;
 }
 
+static ssize_t modalias_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
+{
+	struct rio_dev *rdev = to_rio_dev(dev);
+
+	return sprintf(buf, "rapidio:v%04Xd%04Xav%04Xad%04X\n",
+		       rdev->vid, rdev->did, rdev->asm_vid, rdev->asm_did);
+}
+
 struct device_attribute rio_dev_attrs[] = {
 	__ATTR_RO(did),
 	__ATTR_RO(vid),
@@ -93,6 +102,7 @@ struct device_attribute rio_dev_attrs[] = {
 	__ATTR_RO(asm_rev),
 	__ATTR_RO(lprev),
 	__ATTR_RO(destid),
+	__ATTR_RO(modalias),
 	__ATTR_NULL,
 };
 
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