linux-kernel - [PATCH] driver core: Make probe_type of driver accessible via sysfs

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Date:   Thu, 8 Jul 2021 20:20:10 +0800
From:   Wenchao Hao <haowenchao@...wei.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <linfeilong@...wei.com>, Wu Bo <wubo40@...wei.com>,
        Zhiqiang Liu <liuzhiqiang26@...wei.com>,
        Wenchao Hao <haowenchao@...wei.com>
Subject: [PATCH] driver core: Make probe_type of driver accessible via sysfs

Like drivers_autoprobe of bus, make probe_type of driver
accessible via sysfs, so we can get and set a driver's probe_type
happily.

Signed-off-by: Wenchao Hao <haowenchao@...wei.com>
---
 drivers/base/bus.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 1f6b4bd61056..e006562cb638 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -583,6 +583,25 @@ static ssize_t uevent_store(struct device_driver *drv, const char *buf,
 }
 static DRIVER_ATTR_WO(uevent);
 
+static ssize_t probe_type_show(struct device_driver *drv, char *buf)
+{
+	return sysfs_emit(buf, "%d\n", drv->probe_type);
+}
+
+static ssize_t probe_type_store(struct device_driver *drv, const char *buf,
+		size_t count)
+{
+	if (buf[0] == '0')
+		drv->probe_type = 0;
+	else if (buf[0] == '1')
+		drv->probe_type = 1;
+	else if (buf[0] == '2')
+		drv->probe_type = 2;
+
+	return count;
+}
+static DRIVER_ATTR_RW(probe_type);
+
 /**
  * bus_add_driver - Add a driver to the bus.
  * @drv: driver.
@@ -626,6 +645,12 @@ int bus_add_driver(struct device_driver *drv)
 		printk(KERN_ERR "%s: uevent attr (%s) failed\n",
 			__func__, drv->name);
 	}
+	error = driver_create_file(drv, &driver_attr_probe_type);
+	if (error) {
+		printk(KERN_ERR "%s: probe_type attr (%s) failed\n",
+				__func__, drv->name);
+	}
+
 	error = driver_add_groups(drv, bus->drv_groups);
 	if (error) {
 		/* How the hell do we get out of this pickle? Give up */
-- 
2.27.0