linux-kernel - [PATCH v2 2/4] i3c: Add modalias sysfs attribute

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Message-Id: <a90f64f830128cd12762153de7828b775574c156.1582796652.git.vitor.soares@synopsys.com>
Date:   Thu, 27 Feb 2020 12:31:07 +0100
From:   Vitor Soares <Vitor.Soares@...opsys.com>
To:     pgaj@...ence.com, bbrezillon@...nel.org,
        linux-i3c@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        Vitor Soares <Vitor.Soares@...opsys.com>,
        Boris Brezillon <boris.brezillon@...labora.com>
Subject: [PATCH v2 2/4] i3c: Add modalias sysfs attribute

Create modalias sysfs attribute for modalias devices.

Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
Signed-off-by: Vitor Soares <vitor.soares@...opsys.com>
---
 drivers/i3c/master.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index b6db828..925e1ed 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -241,12 +241,34 @@ static ssize_t hdrcap_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(hdrcap);
 
+static ssize_t modalias_show(struct device *dev,
+			     struct device_attribute *da, char *buf)
+{
+	struct i3c_device *i3c = dev_to_i3cdev(dev);
+	struct i3c_device_info devinfo;
+	u16 manuf, part, ext;
+
+	i3c_device_get_info(i3c, &devinfo);
+	manuf = I3C_PID_MANUF_ID(devinfo.pid);
+	part = I3C_PID_PART_ID(devinfo.pid);
+	ext = I3C_PID_EXTRA_INFO(devinfo.pid);
+
+	if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
+		return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr,
+			       manuf);
+
+	return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
+		       devinfo.dcr, manuf, part, ext);
+}
+static DEVICE_ATTR_RO(modalias);
+
 static struct attribute *i3c_device_attrs[] = {
 	&dev_attr_bcr.attr,
 	&dev_attr_dcr.attr,
 	&dev_attr_pid.attr,
 	&dev_attr_dynamic_address.attr,
 	&dev_attr_hdrcap.attr,
+	&dev_attr_modalias.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(i3c_device);
-- 
2.7.4