Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936560AbZFPF50 (ORCPT ); Tue, 16 Jun 2009 01:57:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759898AbZFPFvR (ORCPT ); Tue, 16 Jun 2009 01:51:17 -0400 Received: from kroah.org ([198.145.64.141]:48366 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934949AbZFPFvM (ORCPT ); Tue, 16 Jun 2009 01:51:12 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Kay Sievers , Jan Blunck , Greg Kroah-Hartman Subject: [PATCH 25/64] Driver Core: add nodename callbacks Date: Mon, 15 Jun 2009 22:46:14 -0700 Message-Id: <1245131213-24168-25-git-send-email-gregkh@suse.de> X-Mailer: git-send-email 1.6.3.1 In-Reply-To: <20090616051351.GA23627@kroah.com> References: <20090616051351.GA23627@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3858 Lines: 122 From: Kay Sievers This adds the nodename callback for struct class, struct device_type and struct device, to allow drivers to send userspace hints on the device name and subdirectory that should be used for it. Signed-off-by: Kay Sievers Signed-off-by: Jan Blunck Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++- include/linux/device.h | 3 ++ 2 files changed, 53 insertions(+), 1 deletions(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 4d59975..7ecb193 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -162,10 +162,18 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj, struct device *dev = to_dev(kobj); int retval = 0; - /* add the major/minor if present */ + /* add device node properties if present */ if (MAJOR(dev->devt)) { + const char *tmp; + const char *name; + add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); + name = device_get_nodename(dev, &tmp); + if (name) { + add_uevent_var(env, "DEVNAME=%s", name); + kfree(tmp); + } } if (dev->type && dev->type->name) @@ -1129,6 +1137,47 @@ static struct device *next_device(struct klist_iter *i) } /** + * device_get_nodename - path of device node file + * @dev: device + * @tmp: possibly allocated string + * + * Return the relative path of a possible device node. + * Non-default names may need to allocate a memory to compose + * a name. This memory is returned in tmp and needs to be + * freed by the caller. + */ +const char *device_get_nodename(struct device *dev, const char **tmp) +{ + char *s; + + *tmp = NULL; + + /* the device type may provide a specific name */ + if (dev->type && dev->type->nodename) + *tmp = dev->type->nodename(dev); + if (*tmp) + return *tmp; + + /* the class may provide a specific name */ + if (dev->class && dev->class->nodename) + *tmp = dev->class->nodename(dev); + if (*tmp) + return *tmp; + + /* return name without allocation, tmp == NULL */ + if (strchr(dev_name(dev), '!') == NULL) + return dev_name(dev); + + /* replace '!' in the name with '/' */ + *tmp = kstrdup(dev_name(dev), GFP_KERNEL); + if (!*tmp) + return NULL; + while ((s = strchr(*tmp, '!'))) + s[0] = '/'; + return *tmp; +} + +/** * device_for_each_child - device child iterator. * @parent: parent struct device. * @data: data for the callback. diff --git a/include/linux/device.h b/include/linux/device.h index 4410464..ed4e39f 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -194,6 +194,7 @@ struct class { struct kobject *dev_kobj; int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env); + char *(*nodename)(struct device *dev); void (*class_release)(struct class *class); void (*dev_release)(struct device *dev); @@ -289,6 +290,7 @@ struct device_type { const char *name; struct attribute_group **groups; int (*uevent)(struct device *dev, struct kobj_uevent_env *env); + char *(*nodename)(struct device *dev); void (*release)(struct device *dev); struct dev_pm_ops *pm; @@ -488,6 +490,7 @@ extern struct device *device_find_child(struct device *dev, void *data, extern int device_rename(struct device *dev, char *new_name); extern int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order); +extern const char *device_get_nodename(struct device *dev, const char **tmp); /* * Root device objects for grouping under /sys/devices -- 1.6.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/