From: Florian Fainelli <f.fainelli@gmail•com>
To: netdev@vger•kernel.org
Cc: Andrew Lunn <andrew@lunn•ch>,
Florian Fainelli <f.fainelli@gmail•com>,
Jason Cooper <jason@lakedaemon•net>,
Vivien Didelot <vivien.didelot@savoirfairelinux•com>,
Greg Kroah-Hartman <gregkh@linuxfoundation•org>,
Russell King <linux@armlinux•org.uk>,
open list <linux-kernel@vger•kernel.org>,
Gregory Clement <gregory.clement@free-electrons•com>,
"David S. Miller" <davem@davemloft•net>,
"moderated list:ARM/Marvell Dove/MV78xx0/Orion SOC support"
<linux-arm-kernel@lists•infradead.org>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail•com>
Subject: [PATCH net-next v4 05/10] drivers: base: Add device_find_in_class_name()
Date: Tue, 17 Jan 2017 15:21:47 -0800 [thread overview]
Message-ID: <20170117232152.1661-6-f.fainelli@gmail.com> (raw)
In-Reply-To: <20170117232152.1661-1-f.fainelli@gmail.com>
Add a helper function to lookup a device reference given a class name.
This is a preliminary patch to remove adhoc code from net/dsa/dsa.c and
make it more generic.
Signed-off-by: Florian Fainelli <f.fainelli@gmail•com>
---
drivers/base/core.c | 31 +++++++++++++++++++++++++++++++
include/linux/device.h | 2 ++
2 files changed, 33 insertions(+)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8c25e68e67d7..fb9fced38634 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2058,6 +2058,37 @@ struct device *device_find_child(struct device *parent, void *data,
}
EXPORT_SYMBOL_GPL(device_find_child);
+static int device_class_name_match(struct device *dev, void *class)
+{
+ if (dev->class != NULL && !strcmp(dev->class->name, class))
+ return 1;
+
+ return 0;
+}
+
+/**
+ * device_find_in_class_name - device iterator for locating a particular device
+ * within the specified class name
+ * @parent: parent struct device
+ * @class_name: Class name to match against
+ *
+ * This function returns 1 if the device (specified by @parent), or one of its child
+ * is in the class whose name is specified by @class_name. Returns 0 otherwise.
+ *
+ * NOTE: you will need to drop the reference with put_device() after use.
+ */
+struct device *device_find_in_class_name(struct device *parent,
+ char *class_name)
+{
+ if (device_class_name_match(parent, class_name)) {
+ get_device(parent);
+ return parent;
+ }
+
+ return device_find_child(parent, class_name, device_class_name_match);
+}
+EXPORT_SYMBOL_GPL(device_find_in_class_name);
+
int __init devices_init(void)
{
devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
diff --git a/include/linux/device.h b/include/linux/device.h
index 491b4c0ca633..fbc2a255f92e 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -1120,6 +1120,8 @@ extern int device_for_each_child_reverse(struct device *dev, void *data,
int (*fn)(struct device *dev, void *data));
extern struct device *device_find_child(struct device *dev, void *data,
int (*match)(struct device *dev, void *data));
+extern struct device *device_find_in_class_name(struct device *parent,
+ char *class_name);
extern int device_rename(struct device *dev, const char *new_name);
extern int device_move(struct device *dev, struct device *new_parent,
enum dpm_order dpm_order);
--
2.9.3
next prev parent reply other threads:[~2017-01-17 23:21 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-17 23:21 [PATCH net-next v4 00/10] net: dsa: Support for pdata in dsa2 Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 01/10] net: dsa: Pass device pointer to dsa_register_switch Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 02/10] net: dsa: Make most functions take a dsa_port argument Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 03/10] net: dsa: Suffix function manipulating device_node with _dn Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 04/10] net: dsa: Move ports assignment closer to error checking Florian Fainelli
2017-01-17 23:21 ` Florian Fainelli [this message]
2017-01-17 23:34 ` [PATCH net-next v4 05/10] drivers: base: Add device_find_in_class_name() Andy Shevchenko
2017-01-17 23:43 ` Florian Fainelli
2017-01-18 0:00 ` Andy Shevchenko
2017-01-18 0:04 ` Florian Fainelli
2017-01-18 0:07 ` Andy Shevchenko
2017-01-18 0:13 ` Florian Fainelli
2017-01-18 7:06 ` Greg Kroah-Hartman
2017-01-17 23:21 ` [PATCH net-next v4 06/10] net: dsa: Migrate to device_find_in_class_name() Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 07/10] net: Relocate dev_to_net_device() into net/core/dev.c Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 08/10] net: dsa: Add support for platform data Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 09/10] net: phy: Allow pre-declaration of MDIO devices Florian Fainelli
2017-01-17 23:21 ` [PATCH net-next v4 10/10] ARM: orion: Register DSA switch as a MDIO device Florian Fainelli
2017-01-18 21:50 ` [PATCH net-next v4 00/10] net: dsa: Support for pdata in dsa2 David Miller
2017-01-18 22:06 ` Florian Fainelli
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