![Linus Torvalds](/assets/img/avatar_default.png)
- Hotplug changes allowing device hot-removal operations to fail gracefully (instead of crashing the kernel) if they cannot be carried out completely. From Rafael J Wysocki and Toshi Kani. - Freezer update from Colin Cross and Mandeep Singh Baines targeted at making the freezing of tasks a bit less heavy weight operation. - cpufreq resume fix from Srivatsa S Bhat for a regression introduced during the 3.10 cycle causing some cpufreq sysfs attributes to return wrong values to user space after resume. - New freqdomain_cpus sysfs attribute for the acpi-cpufreq driver to provide information previously available via related_cpus from Lan Tianyu. - cpufreq fixes and cleanups from Viresh Kumar, Jacob Shin, Heiko Stübner, Xiaoguang Chen, Ezequiel Garcia, Arnd Bergmann, and Tang Yuantian. - Fix for an ACPICA regression causing suspend/resume issues to appear on some systems introduced during the 3.4 development cycle from Lv Zheng. - ACPICA fixes and cleanups from Bob Moore, Tomasz Nowicki, Lv Zheng, Chao Guan, and Zhang Rui. - New cupidle driver for Xilinx Zynq processors from Michal Simek. - cpuidle fixes and cleanups from Daniel Lezcano. - Changes to make suspend/resume work correctly in Xen guests from Konrad Rzeszutek Wilk. - ACPI device power management fixes and cleanups from Fengguang Wu and Rafael J Wysocki. - ACPI documentation updates from Lv Zheng, Aaron Lu and Hanjun Guo. - Fix for the IA-64 issue that was the reason for reverting commit9f29ab1
and updates of the ACPI scan code from Rafael J Wysocki. - Mechanism for adding CMOS RTC address space handlers from Lan Tianyu (to allow some EC-related breakage to be fixed on some systems). - Spec-compliant implementation of acpi_os_get_timer() from Mika Westerberg. - Modification of do_acpi_find_child() to execute _STA in order to to avoid situations in which a pointer to a disabled device object is returned instead of an enabled one with the same _ADR value. From Jeff Wu. - Intel BayTrail PCH (Platform Controller Hub) support for the ACPI Intel Low-Power Subsystems (LPSS) driver and modificaions of that driver to work around a couple of known BIOS issues from Mika Westerberg and Heikki Krogerus. - EC driver fix from Vasiliy Kulikov to make it use get_user() and put_user() instead of dereferencing user space pointers blindly. - Assorted ACPI code cleanups from Bjorn Helgaas, Nicholas Mazzuca and Toshi Kani. - Modification of the "runtime idle" helper routine to take the return values of the callbacks executed by it into account and to call rpm_suspend() if they return 0, which allows some code bloat reduction to be done, from Rafael J Wysocki and Alan Stern. - New trace points for PM QoS from Sahara <keun-o.park@windriver.com>. - PM QoS documentation update from Lan Tianyu. - Assorted core PM code cleanups and changes from Bernie Thompson, Bjorn Helgaas, Julius Werner, and Shuah Khan. - New devfreq driver for the Exynos5-bus device from Abhilash Kesavan. - Minor devfreq cleanups, fixes and MAINTAINERS update from MyungJoo Ham, Abhilash Kesavan, Paul Bolle, Rajagopal Venkat, and Wei Yongjun. - OMAP Adaptive Voltage Scaling (AVS) SmartReflex voltage control driver updates from Andrii Tseglytskyi and Nishanth Menon. / -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iQIcBAABAgAGBQJR0ZNOAAoJEKhOf7ml8uNsDLYP/0EU4rmvw0TWTITfp6RS1KDE 9GwBn96ZR4Q5bJd9gBCTPSqhHOYMqxWEUp99sn/M2wehG1pk/jw5LO56+2IhM3UZ g1HDcJ7te2nVT/iXsKiAGTVhU9Rk0aYwoVSknwk27qpIBGxW9w/s5tLX8pY3Q3Zq wL/7aTPjyL+PFFFEaxgH7qLqsl3DhbtYW5AriUBTkXout/tJ4eO1b7MNBncLDh8X VQ/0DNCKE95VEJfkO4rk9RKUyVp9GDn0i+HXCD/FS4IA5oYzePdVdNDmXf7g+swe CGlTZq8pB+oBpDiHl4lxzbNrKQjRNbGnDUkoRcWqn0nAw56xK+vmYnWJhW99gQ/I fKnvxeLca5po1aiqmC4VSJxZIatFZqLrZAI4dzoCLWY+bGeTnCKmj0/F8ytFnZA2 8IuLLs7/dFOaHXV/pKmpg6FAlFa9CPxoqRFoyqb4M0GjEarADyalXUWsPtG+6xCp R/p0CISpwk+guKZR/qPhL7M654S7SHrPwd2DPF0KgGsvk+G2GhoB8EzvD8BVp98Z 9siCGCdgKQfJQVI6R0k9aFmn/4gRQIAgyPhkhv9tqULUUkiaXki+/t8kPfnb8O/d zep+CA57E2G8MYLkDJfpFeKS7GpPD6TIdgFdGmOUC0Y6sl9iTdiw4yTx8O2JM37z rHBZfYGkJBrbGRu+Q1gs =VBBq -----END PGP SIGNATURE----- Merge tag 'pm+acpi-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm Pull power management and ACPI updates from Rafael Wysocki: "This time the total number of ACPI commits is slightly greater than the number of cpufreq commits, but Viresh Kumar (who works on cpufreq) remains the most active patch submitter. To me, the most significant change is the addition of offline/online device operations to the driver core (with the Greg's blessing) and the related modifications of the ACPI core hotplug code. Next are the freezer updates from Colin Cross that should make the freezing of tasks a bit less heavy weight. We also have a couple of regression fixes, a number of fixes for issues that have not been identified as regressions, two new drivers and a bunch of cleanups all over. Highlights: - Hotplug changes to support graceful hot-removal failures. It sometimes is necessary to fail device hot-removal operations gracefully if they cannot be carried out completely. For example, if memory from a memory module being hot-removed has been allocated for the kernel's own use and cannot be moved elsewhere, it's desirable to fail the hot-removal operation in a graceful way rather than to crash the kernel, but currenty a success or a kernel crash are the only possible outcomes of an attempted memory hot-removal. Needless to say, that is not a very attractive alternative and it had to be addressed. However, in order to make it work for memory, I first had to make it work for CPUs and for this purpose I needed to modify the ACPI processor driver. It's been split into two parts, a resident one handling the low-level initialization/cleanup and a modular one playing the actual driver's role (but it binds to the CPU system device objects rather than to the ACPI device objects representing processors). That's been sort of like a live brain surgery on a patient who's riding a bike. So this is a little scary, but since we found and fixed a couple of regressions it caused to happen during the early linux-next testing (a month ago), nobody has complained. As a bonus we remove some duplicated ACPI hotplug code, because the ACPI-based CPU hotplug is now going to use the common ACPI hotplug code. - Lighter weight freezing of tasks. These changes from Colin Cross and Mandeep Singh Baines are targeted at making the freezing of tasks a bit less heavy weight operation. They reduce the number of tasks woken up every time during the freezing, by using the observation that the freezer simply doesn't need to wake up some of them and wait for them all to call refrigerator(). The time needed for the freezer to decide to report a failure is reduced too. Also reintroduced is the check causing a lockdep warining to trigger when try_to_freeze() is called with locks held (which is generally unsafe and shouldn't happen). - cpufreq updates First off, a commit from Srivatsa S Bhat fixes a resume regression introduced during the 3.10 cycle causing some cpufreq sysfs attributes to return wrong values to user space after resume. The fix is kind of fresh, but also it's pretty obvious once Srivatsa has identified the root cause. Second, we have a new freqdomain_cpus sysfs attribute for the acpi-cpufreq driver to provide information previously available via related_cpus. From Lan Tianyu. Finally, we fix a number of issues, mostly related to the CPUFREQ_POSTCHANGE notifier and cpufreq Kconfig options and clean up some code. The majority of changes from Viresh Kumar with bits from Jacob Shin, Heiko Stübner, Xiaoguang Chen, Ezequiel Garcia, Arnd Bergmann, and Tang Yuantian. - ACPICA update A usual bunch of updates from the ACPICA upstream. During the 3.4 cycle we introduced support for ACPI 5 extended sleep registers, but they are only supposed to be used if the HW-reduced mode bit is set in the FADT flags and the code attempted to use them without checking that bit. That caused suspend/resume regressions to happen on some systems. Fix from Lv Zheng causes those registers to be used only if the HW-reduced mode bit is set. Apart from this some other ACPICA bugs are fixed and code cleanups are made by Bob Moore, Tomasz Nowicki, Lv Zheng, Chao Guan, and Zhang Rui. - cpuidle updates New driver for Xilinx Zynq processors is added by Michal Simek. Multidriver support simplification, addition of some missing kerneldoc comments and Kconfig-related fixes come from Daniel Lezcano. - ACPI power management updates Changes to make suspend/resume work correctly in Xen guests from Konrad Rzeszutek Wilk, sparse warning fix from Fengguang Wu and cleanups and fixes of the ACPI device power state selection routine. - ACPI documentation updates Some previously missing pieces of ACPI documentation are added by Lv Zheng and Aaron Lu (hopefully, that will help people to uderstand how the ACPI subsystem works) and one outdated doc is updated by Hanjun Guo. - Assorted ACPI updates We finally nailed down the IA-64 issue that was the reason for reverting commit9f29ab11dd
("ACPI / scan: do not match drivers against objects having scan handlers"), so we can fix it and move the ACPI scan handler check added to the ACPI video driver back to the core. A mechanism for adding CMOS RTC address space handlers is introduced by Lan Tianyu to allow some EC-related breakage to be fixed on some systems. A spec-compliant implementation of acpi_os_get_timer() is added by Mika Westerberg. The evaluation of _STA is added to do_acpi_find_child() to avoid situations in which a pointer to a disabled device object is returned instead of an enabled one with the same _ADR value. From Jeff Wu. Intel BayTrail PCH (Platform Controller Hub) support is added to the ACPI driver for Intel Low-Power Subsystems (LPSS) and that driver is modified to work around a couple of known BIOS issues. Changes from Mika Westerberg and Heikki Krogerus. The EC driver is fixed by Vasiliy Kulikov to use get_user() and put_user() instead of dereferencing user space pointers blindly. Code cleanups are made by Bjorn Helgaas, Nicholas Mazzuca and Toshi Kani. - Assorted power management updates The "runtime idle" helper routine is changed to take the return values of the callbacks executed by it into account and to call rpm_suspend() if they return 0, which allows us to reduce the overall code bloat a bit (by dropping some code that's not necessary any more after that modification). The runtime PM documentation is updated by Alan Stern (to reflect the "runtime idle" behavior change). New trace points for PM QoS are added by Sahara (<keun-o.park@windriver.com>). PM QoS documentation is updated by Lan Tianyu. Code cleanups are made and minor issues are addressed by Bernie Thompson, Bjorn Helgaas, Julius Werner, and Shuah Khan. - devfreq updates New driver for the Exynos5-bus device from Abhilash Kesavan. Minor cleanups, fixes and MAINTAINERS update from MyungJoo Ham, Abhilash Kesavan, Paul Bolle, Rajagopal Venkat, and Wei Yongjun. - OMAP power management updates Adaptive Voltage Scaling (AVS) SmartReflex voltage control driver updates from Andrii Tseglytskyi and Nishanth Menon." * tag 'pm+acpi-3.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (162 commits) cpufreq: Fix cpufreq regression after suspend/resume ACPI / PM: Fix possible NULL pointer deref in acpi_pm_device_sleep_state() PM / Sleep: Warn about system time after resume with pm_trace cpufreq: don't leave stale policy pointer in cdbs->cur_policy acpi-cpufreq: Add new sysfs attribute freqdomain_cpus cpufreq: make sure frequency transitions are serialized ACPI: implement acpi_os_get_timer() according the spec ACPI / EC: Add HP Folio 13 to ec_dmi_table in order to skip DSDT scan ACPI: Add CMOS RTC Operation Region handler support ACPI / processor: Drop unused variable from processor_perflib.c cpufreq: tegra: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: s3c64xx: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: omap: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: imx6q: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: exynos: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: dbx500: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: davinci: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: arm-big-little: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: powernow-k8: call CPUFREQ_POSTCHANGE notfier in error cases cpufreq: pcc: call CPUFREQ_POSTCHANGE notfier in error cases ...
2173 lines
55 KiB
C
2173 lines
55 KiB
C
/*
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* drivers/base/core.c - core driver model code (device registration, etc)
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*
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* Copyright (c) 2002-3 Patrick Mochel
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* Copyright (c) 2002-3 Open Source Development Labs
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* Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (c) 2006 Novell, Inc.
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*
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* This file is released under the GPLv2
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*
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/kdev_t.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/genhd.h>
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#include <linux/kallsyms.h>
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#include <linux/mutex.h>
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#include <linux/async.h>
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#include <linux/pm_runtime.h>
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#include <linux/netdevice.h>
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#include "base.h"
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#include "power/power.h"
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#ifdef CONFIG_SYSFS_DEPRECATED
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#ifdef CONFIG_SYSFS_DEPRECATED_V2
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long sysfs_deprecated = 1;
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#else
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long sysfs_deprecated = 0;
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#endif
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static __init int sysfs_deprecated_setup(char *arg)
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{
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return strict_strtol(arg, 10, &sysfs_deprecated);
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}
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early_param("sysfs.deprecated", sysfs_deprecated_setup);
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#endif
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int (*platform_notify)(struct device *dev) = NULL;
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int (*platform_notify_remove)(struct device *dev) = NULL;
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static struct kobject *dev_kobj;
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struct kobject *sysfs_dev_char_kobj;
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struct kobject *sysfs_dev_block_kobj;
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#ifdef CONFIG_BLOCK
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static inline int device_is_not_partition(struct device *dev)
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{
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return !(dev->type == &part_type);
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}
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#else
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static inline int device_is_not_partition(struct device *dev)
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{
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return 1;
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}
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#endif
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/**
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* dev_driver_string - Return a device's driver name, if at all possible
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* @dev: struct device to get the name of
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*
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* Will return the device's driver's name if it is bound to a device. If
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* the device is not bound to a driver, it will return the name of the bus
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* it is attached to. If it is not attached to a bus either, an empty
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* string will be returned.
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*/
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const char *dev_driver_string(const struct device *dev)
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{
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struct device_driver *drv;
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/* dev->driver can change to NULL underneath us because of unbinding,
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* so be careful about accessing it. dev->bus and dev->class should
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* never change once they are set, so they don't need special care.
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*/
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drv = ACCESS_ONCE(dev->driver);
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return drv ? drv->name :
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(dev->bus ? dev->bus->name :
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(dev->class ? dev->class->name : ""));
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}
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EXPORT_SYMBOL(dev_driver_string);
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#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
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static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct device_attribute *dev_attr = to_dev_attr(attr);
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struct device *dev = kobj_to_dev(kobj);
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ssize_t ret = -EIO;
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if (dev_attr->show)
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ret = dev_attr->show(dev, dev_attr, buf);
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if (ret >= (ssize_t)PAGE_SIZE) {
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print_symbol("dev_attr_show: %s returned bad count\n",
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(unsigned long)dev_attr->show);
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}
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return ret;
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}
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static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *buf, size_t count)
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{
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struct device_attribute *dev_attr = to_dev_attr(attr);
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struct device *dev = kobj_to_dev(kobj);
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ssize_t ret = -EIO;
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if (dev_attr->store)
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ret = dev_attr->store(dev, dev_attr, buf, count);
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return ret;
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}
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static const struct sysfs_ops dev_sysfs_ops = {
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.show = dev_attr_show,
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.store = dev_attr_store,
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};
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#define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr)
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ssize_t device_store_ulong(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct dev_ext_attribute *ea = to_ext_attr(attr);
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char *end;
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unsigned long new = simple_strtoul(buf, &end, 0);
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if (end == buf)
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return -EINVAL;
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*(unsigned long *)(ea->var) = new;
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/* Always return full write size even if we didn't consume all */
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return size;
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}
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EXPORT_SYMBOL_GPL(device_store_ulong);
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ssize_t device_show_ulong(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct dev_ext_attribute *ea = to_ext_attr(attr);
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return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var));
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}
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EXPORT_SYMBOL_GPL(device_show_ulong);
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ssize_t device_store_int(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct dev_ext_attribute *ea = to_ext_attr(attr);
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char *end;
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long new = simple_strtol(buf, &end, 0);
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if (end == buf || new > INT_MAX || new < INT_MIN)
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return -EINVAL;
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*(int *)(ea->var) = new;
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/* Always return full write size even if we didn't consume all */
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return size;
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}
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EXPORT_SYMBOL_GPL(device_store_int);
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ssize_t device_show_int(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct dev_ext_attribute *ea = to_ext_attr(attr);
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return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var));
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}
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EXPORT_SYMBOL_GPL(device_show_int);
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ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct dev_ext_attribute *ea = to_ext_attr(attr);
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if (strtobool(buf, ea->var) < 0)
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return -EINVAL;
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return size;
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}
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EXPORT_SYMBOL_GPL(device_store_bool);
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ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct dev_ext_attribute *ea = to_ext_attr(attr);
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return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var));
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}
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EXPORT_SYMBOL_GPL(device_show_bool);
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/**
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* device_release - free device structure.
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* @kobj: device's kobject.
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*
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* This is called once the reference count for the object
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* reaches 0. We forward the call to the device's release
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* method, which should handle actually freeing the structure.
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*/
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static void device_release(struct kobject *kobj)
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{
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struct device *dev = kobj_to_dev(kobj);
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struct device_private *p = dev->p;
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/*
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* Some platform devices are driven without driver attached
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* and managed resources may have been acquired. Make sure
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* all resources are released.
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*
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* Drivers still can add resources into device after device
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* is deleted but alive, so release devres here to avoid
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* possible memory leak.
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*/
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devres_release_all(dev);
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if (dev->release)
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dev->release(dev);
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else if (dev->type && dev->type->release)
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dev->type->release(dev);
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else if (dev->class && dev->class->dev_release)
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dev->class->dev_release(dev);
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else
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WARN(1, KERN_ERR "Device '%s' does not have a release() "
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"function, it is broken and must be fixed.\n",
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dev_name(dev));
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kfree(p);
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}
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static const void *device_namespace(struct kobject *kobj)
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{
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struct device *dev = kobj_to_dev(kobj);
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const void *ns = NULL;
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if (dev->class && dev->class->ns_type)
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ns = dev->class->namespace(dev);
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return ns;
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}
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static struct kobj_type device_ktype = {
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.release = device_release,
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.sysfs_ops = &dev_sysfs_ops,
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.namespace = device_namespace,
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};
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static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
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{
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struct kobj_type *ktype = get_ktype(kobj);
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if (ktype == &device_ktype) {
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struct device *dev = kobj_to_dev(kobj);
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if (dev->bus)
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return 1;
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if (dev->class)
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return 1;
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}
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return 0;
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}
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static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
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{
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struct device *dev = kobj_to_dev(kobj);
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if (dev->bus)
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return dev->bus->name;
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if (dev->class)
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return dev->class->name;
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return NULL;
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}
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static int dev_uevent(struct kset *kset, struct kobject *kobj,
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struct kobj_uevent_env *env)
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{
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struct device *dev = kobj_to_dev(kobj);
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int retval = 0;
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/* add device node properties if present */
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if (MAJOR(dev->devt)) {
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const char *tmp;
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const char *name;
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umode_t mode = 0;
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kuid_t uid = GLOBAL_ROOT_UID;
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kgid_t gid = GLOBAL_ROOT_GID;
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add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
|
|
add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
|
|
name = device_get_devnode(dev, &mode, &uid, &gid, &tmp);
|
|
if (name) {
|
|
add_uevent_var(env, "DEVNAME=%s", name);
|
|
if (mode)
|
|
add_uevent_var(env, "DEVMODE=%#o", mode & 0777);
|
|
if (!uid_eq(uid, GLOBAL_ROOT_UID))
|
|
add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid));
|
|
if (!gid_eq(gid, GLOBAL_ROOT_GID))
|
|
add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid));
|
|
kfree(tmp);
|
|
}
|
|
}
|
|
|
|
if (dev->type && dev->type->name)
|
|
add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
|
|
|
|
if (dev->driver)
|
|
add_uevent_var(env, "DRIVER=%s", dev->driver->name);
|
|
|
|
/* Add common DT information about the device */
|
|
of_device_uevent(dev, env);
|
|
|
|
/* have the bus specific function add its stuff */
|
|
if (dev->bus && dev->bus->uevent) {
|
|
retval = dev->bus->uevent(dev, env);
|
|
if (retval)
|
|
pr_debug("device: '%s': %s: bus uevent() returned %d\n",
|
|
dev_name(dev), __func__, retval);
|
|
}
|
|
|
|
/* have the class specific function add its stuff */
|
|
if (dev->class && dev->class->dev_uevent) {
|
|
retval = dev->class->dev_uevent(dev, env);
|
|
if (retval)
|
|
pr_debug("device: '%s': %s: class uevent() "
|
|
"returned %d\n", dev_name(dev),
|
|
__func__, retval);
|
|
}
|
|
|
|
/* have the device type specific function add its stuff */
|
|
if (dev->type && dev->type->uevent) {
|
|
retval = dev->type->uevent(dev, env);
|
|
if (retval)
|
|
pr_debug("device: '%s': %s: dev_type uevent() "
|
|
"returned %d\n", dev_name(dev),
|
|
__func__, retval);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static const struct kset_uevent_ops device_uevent_ops = {
|
|
.filter = dev_uevent_filter,
|
|
.name = dev_uevent_name,
|
|
.uevent = dev_uevent,
|
|
};
|
|
|
|
static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct kobject *top_kobj;
|
|
struct kset *kset;
|
|
struct kobj_uevent_env *env = NULL;
|
|
int i;
|
|
size_t count = 0;
|
|
int retval;
|
|
|
|
/* search the kset, the device belongs to */
|
|
top_kobj = &dev->kobj;
|
|
while (!top_kobj->kset && top_kobj->parent)
|
|
top_kobj = top_kobj->parent;
|
|
if (!top_kobj->kset)
|
|
goto out;
|
|
|
|
kset = top_kobj->kset;
|
|
if (!kset->uevent_ops || !kset->uevent_ops->uevent)
|
|
goto out;
|
|
|
|
/* respect filter */
|
|
if (kset->uevent_ops && kset->uevent_ops->filter)
|
|
if (!kset->uevent_ops->filter(kset, &dev->kobj))
|
|
goto out;
|
|
|
|
env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
|
|
if (!env)
|
|
return -ENOMEM;
|
|
|
|
/* let the kset specific function add its keys */
|
|
retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
|
|
if (retval)
|
|
goto out;
|
|
|
|
/* copy keys to file */
|
|
for (i = 0; i < env->envp_idx; i++)
|
|
count += sprintf(&buf[count], "%s\n", env->envp[i]);
|
|
out:
|
|
kfree(env);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
enum kobject_action action;
|
|
|
|
if (kobject_action_type(buf, count, &action) == 0)
|
|
kobject_uevent(&dev->kobj, action);
|
|
else
|
|
dev_err(dev, "uevent: unknown action-string\n");
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute uevent_attr =
|
|
__ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
|
|
|
|
static ssize_t show_online(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
bool val;
|
|
|
|
lock_device_hotplug();
|
|
val = !dev->offline;
|
|
unlock_device_hotplug();
|
|
return sprintf(buf, "%u\n", val);
|
|
}
|
|
|
|
static ssize_t store_online(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
bool val;
|
|
int ret;
|
|
|
|
ret = strtobool(buf, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
lock_device_hotplug();
|
|
ret = val ? device_online(dev) : device_offline(dev);
|
|
unlock_device_hotplug();
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static struct device_attribute online_attr =
|
|
__ATTR(online, S_IRUGO | S_IWUSR, show_online, store_online);
|
|
|
|
static int device_add_attributes(struct device *dev,
|
|
struct device_attribute *attrs)
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
|
|
if (attrs) {
|
|
for (i = 0; attr_name(attrs[i]); i++) {
|
|
error = device_create_file(dev, &attrs[i]);
|
|
if (error)
|
|
break;
|
|
}
|
|
if (error)
|
|
while (--i >= 0)
|
|
device_remove_file(dev, &attrs[i]);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static void device_remove_attributes(struct device *dev,
|
|
struct device_attribute *attrs)
|
|
{
|
|
int i;
|
|
|
|
if (attrs)
|
|
for (i = 0; attr_name(attrs[i]); i++)
|
|
device_remove_file(dev, &attrs[i]);
|
|
}
|
|
|
|
static int device_add_bin_attributes(struct device *dev,
|
|
struct bin_attribute *attrs)
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
|
|
if (attrs) {
|
|
for (i = 0; attr_name(attrs[i]); i++) {
|
|
error = device_create_bin_file(dev, &attrs[i]);
|
|
if (error)
|
|
break;
|
|
}
|
|
if (error)
|
|
while (--i >= 0)
|
|
device_remove_bin_file(dev, &attrs[i]);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static void device_remove_bin_attributes(struct device *dev,
|
|
struct bin_attribute *attrs)
|
|
{
|
|
int i;
|
|
|
|
if (attrs)
|
|
for (i = 0; attr_name(attrs[i]); i++)
|
|
device_remove_bin_file(dev, &attrs[i]);
|
|
}
|
|
|
|
static int device_add_groups(struct device *dev,
|
|
const struct attribute_group **groups)
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
|
|
if (groups) {
|
|
for (i = 0; groups[i]; i++) {
|
|
error = sysfs_create_group(&dev->kobj, groups[i]);
|
|
if (error) {
|
|
while (--i >= 0)
|
|
sysfs_remove_group(&dev->kobj,
|
|
groups[i]);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static void device_remove_groups(struct device *dev,
|
|
const struct attribute_group **groups)
|
|
{
|
|
int i;
|
|
|
|
if (groups)
|
|
for (i = 0; groups[i]; i++)
|
|
sysfs_remove_group(&dev->kobj, groups[i]);
|
|
}
|
|
|
|
static int device_add_attrs(struct device *dev)
|
|
{
|
|
struct class *class = dev->class;
|
|
const struct device_type *type = dev->type;
|
|
int error;
|
|
|
|
if (class) {
|
|
error = device_add_attributes(dev, class->dev_attrs);
|
|
if (error)
|
|
return error;
|
|
error = device_add_bin_attributes(dev, class->dev_bin_attrs);
|
|
if (error)
|
|
goto err_remove_class_attrs;
|
|
}
|
|
|
|
if (type) {
|
|
error = device_add_groups(dev, type->groups);
|
|
if (error)
|
|
goto err_remove_class_bin_attrs;
|
|
}
|
|
|
|
error = device_add_groups(dev, dev->groups);
|
|
if (error)
|
|
goto err_remove_type_groups;
|
|
|
|
if (device_supports_offline(dev) && !dev->offline_disabled) {
|
|
error = device_create_file(dev, &online_attr);
|
|
if (error)
|
|
goto err_remove_type_groups;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_remove_type_groups:
|
|
if (type)
|
|
device_remove_groups(dev, type->groups);
|
|
err_remove_class_bin_attrs:
|
|
if (class)
|
|
device_remove_bin_attributes(dev, class->dev_bin_attrs);
|
|
err_remove_class_attrs:
|
|
if (class)
|
|
device_remove_attributes(dev, class->dev_attrs);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void device_remove_attrs(struct device *dev)
|
|
{
|
|
struct class *class = dev->class;
|
|
const struct device_type *type = dev->type;
|
|
|
|
device_remove_file(dev, &online_attr);
|
|
device_remove_groups(dev, dev->groups);
|
|
|
|
if (type)
|
|
device_remove_groups(dev, type->groups);
|
|
|
|
if (class) {
|
|
device_remove_attributes(dev, class->dev_attrs);
|
|
device_remove_bin_attributes(dev, class->dev_bin_attrs);
|
|
}
|
|
}
|
|
|
|
|
|
static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return print_dev_t(buf, dev->devt);
|
|
}
|
|
|
|
static struct device_attribute devt_attr =
|
|
__ATTR(dev, S_IRUGO, show_dev, NULL);
|
|
|
|
/* /sys/devices/ */
|
|
struct kset *devices_kset;
|
|
|
|
/**
|
|
* device_create_file - create sysfs attribute file for device.
|
|
* @dev: device.
|
|
* @attr: device attribute descriptor.
|
|
*/
|
|
int device_create_file(struct device *dev,
|
|
const struct device_attribute *attr)
|
|
{
|
|
int error = 0;
|
|
|
|
if (dev) {
|
|
WARN(((attr->attr.mode & S_IWUGO) && !attr->store),
|
|
"Attribute %s: write permission without 'store'\n",
|
|
attr->attr.name);
|
|
WARN(((attr->attr.mode & S_IRUGO) && !attr->show),
|
|
"Attribute %s: read permission without 'show'\n",
|
|
attr->attr.name);
|
|
error = sysfs_create_file(&dev->kobj, &attr->attr);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* device_remove_file - remove sysfs attribute file.
|
|
* @dev: device.
|
|
* @attr: device attribute descriptor.
|
|
*/
|
|
void device_remove_file(struct device *dev,
|
|
const struct device_attribute *attr)
|
|
{
|
|
if (dev)
|
|
sysfs_remove_file(&dev->kobj, &attr->attr);
|
|
}
|
|
|
|
/**
|
|
* device_create_bin_file - create sysfs binary attribute file for device.
|
|
* @dev: device.
|
|
* @attr: device binary attribute descriptor.
|
|
*/
|
|
int device_create_bin_file(struct device *dev,
|
|
const struct bin_attribute *attr)
|
|
{
|
|
int error = -EINVAL;
|
|
if (dev)
|
|
error = sysfs_create_bin_file(&dev->kobj, attr);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_create_bin_file);
|
|
|
|
/**
|
|
* device_remove_bin_file - remove sysfs binary attribute file
|
|
* @dev: device.
|
|
* @attr: device binary attribute descriptor.
|
|
*/
|
|
void device_remove_bin_file(struct device *dev,
|
|
const struct bin_attribute *attr)
|
|
{
|
|
if (dev)
|
|
sysfs_remove_bin_file(&dev->kobj, attr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_remove_bin_file);
|
|
|
|
/**
|
|
* device_schedule_callback_owner - helper to schedule a callback for a device
|
|
* @dev: device.
|
|
* @func: callback function to invoke later.
|
|
* @owner: module owning the callback routine
|
|
*
|
|
* Attribute methods must not unregister themselves or their parent device
|
|
* (which would amount to the same thing). Attempts to do so will deadlock,
|
|
* since unregistration is mutually exclusive with driver callbacks.
|
|
*
|
|
* Instead methods can call this routine, which will attempt to allocate
|
|
* and schedule a workqueue request to call back @func with @dev as its
|
|
* argument in the workqueue's process context. @dev will be pinned until
|
|
* @func returns.
|
|
*
|
|
* This routine is usually called via the inline device_schedule_callback(),
|
|
* which automatically sets @owner to THIS_MODULE.
|
|
*
|
|
* Returns 0 if the request was submitted, -ENOMEM if storage could not
|
|
* be allocated, -ENODEV if a reference to @owner isn't available.
|
|
*
|
|
* NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
|
|
* underlying sysfs routine (since it is intended for use by attribute
|
|
* methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
|
|
*/
|
|
int device_schedule_callback_owner(struct device *dev,
|
|
void (*func)(struct device *), struct module *owner)
|
|
{
|
|
return sysfs_schedule_callback(&dev->kobj,
|
|
(void (*)(void *)) func, dev, owner);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
|
|
|
|
static void klist_children_get(struct klist_node *n)
|
|
{
|
|
struct device_private *p = to_device_private_parent(n);
|
|
struct device *dev = p->device;
|
|
|
|
get_device(dev);
|
|
}
|
|
|
|
static void klist_children_put(struct klist_node *n)
|
|
{
|
|
struct device_private *p = to_device_private_parent(n);
|
|
struct device *dev = p->device;
|
|
|
|
put_device(dev);
|
|
}
|
|
|
|
/**
|
|
* device_initialize - init device structure.
|
|
* @dev: device.
|
|
*
|
|
* This prepares the device for use by other layers by initializing
|
|
* its fields.
|
|
* It is the first half of device_register(), if called by
|
|
* that function, though it can also be called separately, so one
|
|
* may use @dev's fields. In particular, get_device()/put_device()
|
|
* may be used for reference counting of @dev after calling this
|
|
* function.
|
|
*
|
|
* All fields in @dev must be initialized by the caller to 0, except
|
|
* for those explicitly set to some other value. The simplest
|
|
* approach is to use kzalloc() to allocate the structure containing
|
|
* @dev.
|
|
*
|
|
* NOTE: Use put_device() to give up your reference instead of freeing
|
|
* @dev directly once you have called this function.
|
|
*/
|
|
void device_initialize(struct device *dev)
|
|
{
|
|
dev->kobj.kset = devices_kset;
|
|
kobject_init(&dev->kobj, &device_ktype);
|
|
INIT_LIST_HEAD(&dev->dma_pools);
|
|
mutex_init(&dev->mutex);
|
|
lockdep_set_novalidate_class(&dev->mutex);
|
|
spin_lock_init(&dev->devres_lock);
|
|
INIT_LIST_HEAD(&dev->devres_head);
|
|
device_pm_init(dev);
|
|
set_dev_node(dev, -1);
|
|
}
|
|
|
|
struct kobject *virtual_device_parent(struct device *dev)
|
|
{
|
|
static struct kobject *virtual_dir = NULL;
|
|
|
|
if (!virtual_dir)
|
|
virtual_dir = kobject_create_and_add("virtual",
|
|
&devices_kset->kobj);
|
|
|
|
return virtual_dir;
|
|
}
|
|
|
|
struct class_dir {
|
|
struct kobject kobj;
|
|
struct class *class;
|
|
};
|
|
|
|
#define to_class_dir(obj) container_of(obj, struct class_dir, kobj)
|
|
|
|
static void class_dir_release(struct kobject *kobj)
|
|
{
|
|
struct class_dir *dir = to_class_dir(kobj);
|
|
kfree(dir);
|
|
}
|
|
|
|
static const
|
|
struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj)
|
|
{
|
|
struct class_dir *dir = to_class_dir(kobj);
|
|
return dir->class->ns_type;
|
|
}
|
|
|
|
static struct kobj_type class_dir_ktype = {
|
|
.release = class_dir_release,
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.child_ns_type = class_dir_child_ns_type
|
|
};
|
|
|
|
static struct kobject *
|
|
class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
|
|
{
|
|
struct class_dir *dir;
|
|
int retval;
|
|
|
|
dir = kzalloc(sizeof(*dir), GFP_KERNEL);
|
|
if (!dir)
|
|
return NULL;
|
|
|
|
dir->class = class;
|
|
kobject_init(&dir->kobj, &class_dir_ktype);
|
|
|
|
dir->kobj.kset = &class->p->glue_dirs;
|
|
|
|
retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name);
|
|
if (retval < 0) {
|
|
kobject_put(&dir->kobj);
|
|
return NULL;
|
|
}
|
|
return &dir->kobj;
|
|
}
|
|
|
|
|
|
static struct kobject *get_device_parent(struct device *dev,
|
|
struct device *parent)
|
|
{
|
|
if (dev->class) {
|
|
static DEFINE_MUTEX(gdp_mutex);
|
|
struct kobject *kobj = NULL;
|
|
struct kobject *parent_kobj;
|
|
struct kobject *k;
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
/* block disks show up in /sys/block */
|
|
if (sysfs_deprecated && dev->class == &block_class) {
|
|
if (parent && parent->class == &block_class)
|
|
return &parent->kobj;
|
|
return &block_class.p->subsys.kobj;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If we have no parent, we live in "virtual".
|
|
* Class-devices with a non class-device as parent, live
|
|
* in a "glue" directory to prevent namespace collisions.
|
|
*/
|
|
if (parent == NULL)
|
|
parent_kobj = virtual_device_parent(dev);
|
|
else if (parent->class && !dev->class->ns_type)
|
|
return &parent->kobj;
|
|
else
|
|
parent_kobj = &parent->kobj;
|
|
|
|
mutex_lock(&gdp_mutex);
|
|
|
|
/* find our class-directory at the parent and reference it */
|
|
spin_lock(&dev->class->p->glue_dirs.list_lock);
|
|
list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry)
|
|
if (k->parent == parent_kobj) {
|
|
kobj = kobject_get(k);
|
|
break;
|
|
}
|
|
spin_unlock(&dev->class->p->glue_dirs.list_lock);
|
|
if (kobj) {
|
|
mutex_unlock(&gdp_mutex);
|
|
return kobj;
|
|
}
|
|
|
|
/* or create a new class-directory at the parent device */
|
|
k = class_dir_create_and_add(dev->class, parent_kobj);
|
|
/* do not emit an uevent for this simple "glue" directory */
|
|
mutex_unlock(&gdp_mutex);
|
|
return k;
|
|
}
|
|
|
|
/* subsystems can specify a default root directory for their devices */
|
|
if (!parent && dev->bus && dev->bus->dev_root)
|
|
return &dev->bus->dev_root->kobj;
|
|
|
|
if (parent)
|
|
return &parent->kobj;
|
|
return NULL;
|
|
}
|
|
|
|
static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
|
|
{
|
|
/* see if we live in a "glue" directory */
|
|
if (!glue_dir || !dev->class ||
|
|
glue_dir->kset != &dev->class->p->glue_dirs)
|
|
return;
|
|
|
|
kobject_put(glue_dir);
|
|
}
|
|
|
|
static void cleanup_device_parent(struct device *dev)
|
|
{
|
|
cleanup_glue_dir(dev, dev->kobj.parent);
|
|
}
|
|
|
|
static int device_add_class_symlinks(struct device *dev)
|
|
{
|
|
int error;
|
|
|
|
if (!dev->class)
|
|
return 0;
|
|
|
|
error = sysfs_create_link(&dev->kobj,
|
|
&dev->class->p->subsys.kobj,
|
|
"subsystem");
|
|
if (error)
|
|
goto out;
|
|
|
|
if (dev->parent && device_is_not_partition(dev)) {
|
|
error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
|
|
"device");
|
|
if (error)
|
|
goto out_subsys;
|
|
}
|
|
|
|
#ifdef CONFIG_BLOCK
|
|
/* /sys/block has directories and does not need symlinks */
|
|
if (sysfs_deprecated && dev->class == &block_class)
|
|
return 0;
|
|
#endif
|
|
|
|
/* link in the class directory pointing to the device */
|
|
error = sysfs_create_link(&dev->class->p->subsys.kobj,
|
|
&dev->kobj, dev_name(dev));
|
|
if (error)
|
|
goto out_device;
|
|
|
|
return 0;
|
|
|
|
out_device:
|
|
sysfs_remove_link(&dev->kobj, "device");
|
|
|
|
out_subsys:
|
|
sysfs_remove_link(&dev->kobj, "subsystem");
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
static void device_remove_class_symlinks(struct device *dev)
|
|
{
|
|
if (!dev->class)
|
|
return;
|
|
|
|
if (dev->parent && device_is_not_partition(dev))
|
|
sysfs_remove_link(&dev->kobj, "device");
|
|
sysfs_remove_link(&dev->kobj, "subsystem");
|
|
#ifdef CONFIG_BLOCK
|
|
if (sysfs_deprecated && dev->class == &block_class)
|
|
return;
|
|
#endif
|
|
sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev));
|
|
}
|
|
|
|
/**
|
|
* dev_set_name - set a device name
|
|
* @dev: device
|
|
* @fmt: format string for the device's name
|
|
*/
|
|
int dev_set_name(struct device *dev, const char *fmt, ...)
|
|
{
|
|
va_list vargs;
|
|
int err;
|
|
|
|
va_start(vargs, fmt);
|
|
err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
|
|
va_end(vargs);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_set_name);
|
|
|
|
/**
|
|
* device_to_dev_kobj - select a /sys/dev/ directory for the device
|
|
* @dev: device
|
|
*
|
|
* By default we select char/ for new entries. Setting class->dev_obj
|
|
* to NULL prevents an entry from being created. class->dev_kobj must
|
|
* be set (or cleared) before any devices are registered to the class
|
|
* otherwise device_create_sys_dev_entry() and
|
|
* device_remove_sys_dev_entry() will disagree about the presence of
|
|
* the link.
|
|
*/
|
|
static struct kobject *device_to_dev_kobj(struct device *dev)
|
|
{
|
|
struct kobject *kobj;
|
|
|
|
if (dev->class)
|
|
kobj = dev->class->dev_kobj;
|
|
else
|
|
kobj = sysfs_dev_char_kobj;
|
|
|
|
return kobj;
|
|
}
|
|
|
|
static int device_create_sys_dev_entry(struct device *dev)
|
|
{
|
|
struct kobject *kobj = device_to_dev_kobj(dev);
|
|
int error = 0;
|
|
char devt_str[15];
|
|
|
|
if (kobj) {
|
|
format_dev_t(devt_str, dev->devt);
|
|
error = sysfs_create_link(kobj, &dev->kobj, devt_str);
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static void device_remove_sys_dev_entry(struct device *dev)
|
|
{
|
|
struct kobject *kobj = device_to_dev_kobj(dev);
|
|
char devt_str[15];
|
|
|
|
if (kobj) {
|
|
format_dev_t(devt_str, dev->devt);
|
|
sysfs_remove_link(kobj, devt_str);
|
|
}
|
|
}
|
|
|
|
int device_private_init(struct device *dev)
|
|
{
|
|
dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
|
|
if (!dev->p)
|
|
return -ENOMEM;
|
|
dev->p->device = dev;
|
|
klist_init(&dev->p->klist_children, klist_children_get,
|
|
klist_children_put);
|
|
INIT_LIST_HEAD(&dev->p->deferred_probe);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* device_add - add device to device hierarchy.
|
|
* @dev: device.
|
|
*
|
|
* This is part 2 of device_register(), though may be called
|
|
* separately _iff_ device_initialize() has been called separately.
|
|
*
|
|
* This adds @dev to the kobject hierarchy via kobject_add(), adds it
|
|
* to the global and sibling lists for the device, then
|
|
* adds it to the other relevant subsystems of the driver model.
|
|
*
|
|
* Do not call this routine or device_register() more than once for
|
|
* any device structure. The driver model core is not designed to work
|
|
* with devices that get unregistered and then spring back to life.
|
|
* (Among other things, it's very hard to guarantee that all references
|
|
* to the previous incarnation of @dev have been dropped.) Allocate
|
|
* and register a fresh new struct device instead.
|
|
*
|
|
* NOTE: _Never_ directly free @dev after calling this function, even
|
|
* if it returned an error! Always use put_device() to give up your
|
|
* reference instead.
|
|
*/
|
|
int device_add(struct device *dev)
|
|
{
|
|
struct device *parent = NULL;
|
|
struct kobject *kobj;
|
|
struct class_interface *class_intf;
|
|
int error = -EINVAL;
|
|
|
|
dev = get_device(dev);
|
|
if (!dev)
|
|
goto done;
|
|
|
|
if (!dev->p) {
|
|
error = device_private_init(dev);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* for statically allocated devices, which should all be converted
|
|
* some day, we need to initialize the name. We prevent reading back
|
|
* the name, and force the use of dev_name()
|
|
*/
|
|
if (dev->init_name) {
|
|
dev_set_name(dev, "%s", dev->init_name);
|
|
dev->init_name = NULL;
|
|
}
|
|
|
|
/* subsystems can specify simple device enumeration */
|
|
if (!dev_name(dev) && dev->bus && dev->bus->dev_name)
|
|
dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id);
|
|
|
|
if (!dev_name(dev)) {
|
|
error = -EINVAL;
|
|
goto name_error;
|
|
}
|
|
|
|
pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
|
|
|
|
parent = get_device(dev->parent);
|
|
kobj = get_device_parent(dev, parent);
|
|
if (kobj)
|
|
dev->kobj.parent = kobj;
|
|
|
|
/* use parent numa_node */
|
|
if (parent)
|
|
set_dev_node(dev, dev_to_node(parent));
|
|
|
|
/* first, register with generic layer. */
|
|
/* we require the name to be set before, and pass NULL */
|
|
error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
|
|
if (error)
|
|
goto Error;
|
|
|
|
/* notify platform of device entry */
|
|
if (platform_notify)
|
|
platform_notify(dev);
|
|
|
|
error = device_create_file(dev, &uevent_attr);
|
|
if (error)
|
|
goto attrError;
|
|
|
|
if (MAJOR(dev->devt)) {
|
|
error = device_create_file(dev, &devt_attr);
|
|
if (error)
|
|
goto ueventattrError;
|
|
|
|
error = device_create_sys_dev_entry(dev);
|
|
if (error)
|
|
goto devtattrError;
|
|
|
|
devtmpfs_create_node(dev);
|
|
}
|
|
|
|
error = device_add_class_symlinks(dev);
|
|
if (error)
|
|
goto SymlinkError;
|
|
error = device_add_attrs(dev);
|
|
if (error)
|
|
goto AttrsError;
|
|
error = bus_add_device(dev);
|
|
if (error)
|
|
goto BusError;
|
|
error = dpm_sysfs_add(dev);
|
|
if (error)
|
|
goto DPMError;
|
|
device_pm_add(dev);
|
|
|
|
/* Notify clients of device addition. This call must come
|
|
* after dpm_sysfs_add() and before kobject_uevent().
|
|
*/
|
|
if (dev->bus)
|
|
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
|
|
BUS_NOTIFY_ADD_DEVICE, dev);
|
|
|
|
kobject_uevent(&dev->kobj, KOBJ_ADD);
|
|
bus_probe_device(dev);
|
|
if (parent)
|
|
klist_add_tail(&dev->p->knode_parent,
|
|
&parent->p->klist_children);
|
|
|
|
if (dev->class) {
|
|
mutex_lock(&dev->class->p->mutex);
|
|
/* tie the class to the device */
|
|
klist_add_tail(&dev->knode_class,
|
|
&dev->class->p->klist_devices);
|
|
|
|
/* notify any interfaces that the device is here */
|
|
list_for_each_entry(class_intf,
|
|
&dev->class->p->interfaces, node)
|
|
if (class_intf->add_dev)
|
|
class_intf->add_dev(dev, class_intf);
|
|
mutex_unlock(&dev->class->p->mutex);
|
|
}
|
|
done:
|
|
put_device(dev);
|
|
return error;
|
|
DPMError:
|
|
bus_remove_device(dev);
|
|
BusError:
|
|
device_remove_attrs(dev);
|
|
AttrsError:
|
|
device_remove_class_symlinks(dev);
|
|
SymlinkError:
|
|
if (MAJOR(dev->devt))
|
|
devtmpfs_delete_node(dev);
|
|
if (MAJOR(dev->devt))
|
|
device_remove_sys_dev_entry(dev);
|
|
devtattrError:
|
|
if (MAJOR(dev->devt))
|
|
device_remove_file(dev, &devt_attr);
|
|
ueventattrError:
|
|
device_remove_file(dev, &uevent_attr);
|
|
attrError:
|
|
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
|
|
kobject_del(&dev->kobj);
|
|
Error:
|
|
cleanup_device_parent(dev);
|
|
if (parent)
|
|
put_device(parent);
|
|
name_error:
|
|
kfree(dev->p);
|
|
dev->p = NULL;
|
|
goto done;
|
|
}
|
|
|
|
/**
|
|
* device_register - register a device with the system.
|
|
* @dev: pointer to the device structure
|
|
*
|
|
* This happens in two clean steps - initialize the device
|
|
* and add it to the system. The two steps can be called
|
|
* separately, but this is the easiest and most common.
|
|
* I.e. you should only call the two helpers separately if
|
|
* have a clearly defined need to use and refcount the device
|
|
* before it is added to the hierarchy.
|
|
*
|
|
* For more information, see the kerneldoc for device_initialize()
|
|
* and device_add().
|
|
*
|
|
* NOTE: _Never_ directly free @dev after calling this function, even
|
|
* if it returned an error! Always use put_device() to give up the
|
|
* reference initialized in this function instead.
|
|
*/
|
|
int device_register(struct device *dev)
|
|
{
|
|
device_initialize(dev);
|
|
return device_add(dev);
|
|
}
|
|
|
|
/**
|
|
* get_device - increment reference count for device.
|
|
* @dev: device.
|
|
*
|
|
* This simply forwards the call to kobject_get(), though
|
|
* we do take care to provide for the case that we get a NULL
|
|
* pointer passed in.
|
|
*/
|
|
struct device *get_device(struct device *dev)
|
|
{
|
|
return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL;
|
|
}
|
|
|
|
/**
|
|
* put_device - decrement reference count.
|
|
* @dev: device in question.
|
|
*/
|
|
void put_device(struct device *dev)
|
|
{
|
|
/* might_sleep(); */
|
|
if (dev)
|
|
kobject_put(&dev->kobj);
|
|
}
|
|
|
|
/**
|
|
* device_del - delete device from system.
|
|
* @dev: device.
|
|
*
|
|
* This is the first part of the device unregistration
|
|
* sequence. This removes the device from the lists we control
|
|
* from here, has it removed from the other driver model
|
|
* subsystems it was added to in device_add(), and removes it
|
|
* from the kobject hierarchy.
|
|
*
|
|
* NOTE: this should be called manually _iff_ device_add() was
|
|
* also called manually.
|
|
*/
|
|
void device_del(struct device *dev)
|
|
{
|
|
struct device *parent = dev->parent;
|
|
struct class_interface *class_intf;
|
|
|
|
/* Notify clients of device removal. This call must come
|
|
* before dpm_sysfs_remove().
|
|
*/
|
|
if (dev->bus)
|
|
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
|
|
BUS_NOTIFY_DEL_DEVICE, dev);
|
|
dpm_sysfs_remove(dev);
|
|
if (parent)
|
|
klist_del(&dev->p->knode_parent);
|
|
if (MAJOR(dev->devt)) {
|
|
devtmpfs_delete_node(dev);
|
|
device_remove_sys_dev_entry(dev);
|
|
device_remove_file(dev, &devt_attr);
|
|
}
|
|
if (dev->class) {
|
|
device_remove_class_symlinks(dev);
|
|
|
|
mutex_lock(&dev->class->p->mutex);
|
|
/* notify any interfaces that the device is now gone */
|
|
list_for_each_entry(class_intf,
|
|
&dev->class->p->interfaces, node)
|
|
if (class_intf->remove_dev)
|
|
class_intf->remove_dev(dev, class_intf);
|
|
/* remove the device from the class list */
|
|
klist_del(&dev->knode_class);
|
|
mutex_unlock(&dev->class->p->mutex);
|
|
}
|
|
device_remove_file(dev, &uevent_attr);
|
|
device_remove_attrs(dev);
|
|
bus_remove_device(dev);
|
|
device_pm_remove(dev);
|
|
driver_deferred_probe_del(dev);
|
|
|
|
/* Notify the platform of the removal, in case they
|
|
* need to do anything...
|
|
*/
|
|
if (platform_notify_remove)
|
|
platform_notify_remove(dev);
|
|
kobject_uevent(&dev->kobj, KOBJ_REMOVE);
|
|
cleanup_device_parent(dev);
|
|
kobject_del(&dev->kobj);
|
|
put_device(parent);
|
|
}
|
|
|
|
/**
|
|
* device_unregister - unregister device from system.
|
|
* @dev: device going away.
|
|
*
|
|
* We do this in two parts, like we do device_register(). First,
|
|
* we remove it from all the subsystems with device_del(), then
|
|
* we decrement the reference count via put_device(). If that
|
|
* is the final reference count, the device will be cleaned up
|
|
* via device_release() above. Otherwise, the structure will
|
|
* stick around until the final reference to the device is dropped.
|
|
*/
|
|
void device_unregister(struct device *dev)
|
|
{
|
|
pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
|
|
device_del(dev);
|
|
put_device(dev);
|
|
}
|
|
|
|
static struct device *next_device(struct klist_iter *i)
|
|
{
|
|
struct klist_node *n = klist_next(i);
|
|
struct device *dev = NULL;
|
|
struct device_private *p;
|
|
|
|
if (n) {
|
|
p = to_device_private_parent(n);
|
|
dev = p->device;
|
|
}
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* device_get_devnode - path of device node file
|
|
* @dev: device
|
|
* @mode: returned file access mode
|
|
* @uid: returned file owner
|
|
* @gid: returned file group
|
|
* @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_devnode(struct device *dev,
|
|
umode_t *mode, kuid_t *uid, kgid_t *gid,
|
|
const char **tmp)
|
|
{
|
|
char *s;
|
|
|
|
*tmp = NULL;
|
|
|
|
/* the device type may provide a specific name */
|
|
if (dev->type && dev->type->devnode)
|
|
*tmp = dev->type->devnode(dev, mode, uid, gid);
|
|
if (*tmp)
|
|
return *tmp;
|
|
|
|
/* the class may provide a specific name */
|
|
if (dev->class && dev->class->devnode)
|
|
*tmp = dev->class->devnode(dev, mode);
|
|
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.
|
|
* @fn: function to be called for each device.
|
|
* @data: data for the callback.
|
|
*
|
|
* Iterate over @parent's child devices, and call @fn for each,
|
|
* passing it @data.
|
|
*
|
|
* We check the return of @fn each time. If it returns anything
|
|
* other than 0, we break out and return that value.
|
|
*/
|
|
int device_for_each_child(struct device *parent, void *data,
|
|
int (*fn)(struct device *dev, void *data))
|
|
{
|
|
struct klist_iter i;
|
|
struct device *child;
|
|
int error = 0;
|
|
|
|
if (!parent->p)
|
|
return 0;
|
|
|
|
klist_iter_init(&parent->p->klist_children, &i);
|
|
while ((child = next_device(&i)) && !error)
|
|
error = fn(child, data);
|
|
klist_iter_exit(&i);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* device_find_child - device iterator for locating a particular device.
|
|
* @parent: parent struct device
|
|
* @match: Callback function to check device
|
|
* @data: Data to pass to match function
|
|
*
|
|
* This is similar to the device_for_each_child() function above, but it
|
|
* returns a reference to a device that is 'found' for later use, as
|
|
* determined by the @match callback.
|
|
*
|
|
* The callback should return 0 if the device doesn't match and non-zero
|
|
* if it does. If the callback returns non-zero and a reference to the
|
|
* current device can be obtained, this function will return to the caller
|
|
* and not iterate over any more devices.
|
|
*
|
|
* NOTE: you will need to drop the reference with put_device() after use.
|
|
*/
|
|
struct device *device_find_child(struct device *parent, void *data,
|
|
int (*match)(struct device *dev, void *data))
|
|
{
|
|
struct klist_iter i;
|
|
struct device *child;
|
|
|
|
if (!parent)
|
|
return NULL;
|
|
|
|
klist_iter_init(&parent->p->klist_children, &i);
|
|
while ((child = next_device(&i)))
|
|
if (match(child, data) && get_device(child))
|
|
break;
|
|
klist_iter_exit(&i);
|
|
return child;
|
|
}
|
|
|
|
int __init devices_init(void)
|
|
{
|
|
devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
|
|
if (!devices_kset)
|
|
return -ENOMEM;
|
|
dev_kobj = kobject_create_and_add("dev", NULL);
|
|
if (!dev_kobj)
|
|
goto dev_kobj_err;
|
|
sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
|
|
if (!sysfs_dev_block_kobj)
|
|
goto block_kobj_err;
|
|
sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
|
|
if (!sysfs_dev_char_kobj)
|
|
goto char_kobj_err;
|
|
|
|
return 0;
|
|
|
|
char_kobj_err:
|
|
kobject_put(sysfs_dev_block_kobj);
|
|
block_kobj_err:
|
|
kobject_put(dev_kobj);
|
|
dev_kobj_err:
|
|
kset_unregister(devices_kset);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(device_for_each_child);
|
|
EXPORT_SYMBOL_GPL(device_find_child);
|
|
|
|
EXPORT_SYMBOL_GPL(device_initialize);
|
|
EXPORT_SYMBOL_GPL(device_add);
|
|
EXPORT_SYMBOL_GPL(device_register);
|
|
|
|
EXPORT_SYMBOL_GPL(device_del);
|
|
EXPORT_SYMBOL_GPL(device_unregister);
|
|
EXPORT_SYMBOL_GPL(get_device);
|
|
EXPORT_SYMBOL_GPL(put_device);
|
|
|
|
EXPORT_SYMBOL_GPL(device_create_file);
|
|
EXPORT_SYMBOL_GPL(device_remove_file);
|
|
|
|
static DEFINE_MUTEX(device_hotplug_lock);
|
|
|
|
void lock_device_hotplug(void)
|
|
{
|
|
mutex_lock(&device_hotplug_lock);
|
|
}
|
|
|
|
void unlock_device_hotplug(void)
|
|
{
|
|
mutex_unlock(&device_hotplug_lock);
|
|
}
|
|
|
|
static int device_check_offline(struct device *dev, void *not_used)
|
|
{
|
|
int ret;
|
|
|
|
ret = device_for_each_child(dev, NULL, device_check_offline);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0;
|
|
}
|
|
|
|
/**
|
|
* device_offline - Prepare the device for hot-removal.
|
|
* @dev: Device to be put offline.
|
|
*
|
|
* Execute the device bus type's .offline() callback, if present, to prepare
|
|
* the device for a subsequent hot-removal. If that succeeds, the device must
|
|
* not be used until either it is removed or its bus type's .online() callback
|
|
* is executed.
|
|
*
|
|
* Call under device_hotplug_lock.
|
|
*/
|
|
int device_offline(struct device *dev)
|
|
{
|
|
int ret;
|
|
|
|
if (dev->offline_disabled)
|
|
return -EPERM;
|
|
|
|
ret = device_for_each_child(dev, NULL, device_check_offline);
|
|
if (ret)
|
|
return ret;
|
|
|
|
device_lock(dev);
|
|
if (device_supports_offline(dev)) {
|
|
if (dev->offline) {
|
|
ret = 1;
|
|
} else {
|
|
ret = dev->bus->offline(dev);
|
|
if (!ret) {
|
|
kobject_uevent(&dev->kobj, KOBJ_OFFLINE);
|
|
dev->offline = true;
|
|
}
|
|
}
|
|
}
|
|
device_unlock(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* device_online - Put the device back online after successful device_offline().
|
|
* @dev: Device to be put back online.
|
|
*
|
|
* If device_offline() has been successfully executed for @dev, but the device
|
|
* has not been removed subsequently, execute its bus type's .online() callback
|
|
* to indicate that the device can be used again.
|
|
*
|
|
* Call under device_hotplug_lock.
|
|
*/
|
|
int device_online(struct device *dev)
|
|
{
|
|
int ret = 0;
|
|
|
|
device_lock(dev);
|
|
if (device_supports_offline(dev)) {
|
|
if (dev->offline) {
|
|
ret = dev->bus->online(dev);
|
|
if (!ret) {
|
|
kobject_uevent(&dev->kobj, KOBJ_ONLINE);
|
|
dev->offline = false;
|
|
}
|
|
} else {
|
|
ret = 1;
|
|
}
|
|
}
|
|
device_unlock(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct root_device {
|
|
struct device dev;
|
|
struct module *owner;
|
|
};
|
|
|
|
static inline struct root_device *to_root_device(struct device *d)
|
|
{
|
|
return container_of(d, struct root_device, dev);
|
|
}
|
|
|
|
static void root_device_release(struct device *dev)
|
|
{
|
|
kfree(to_root_device(dev));
|
|
}
|
|
|
|
/**
|
|
* __root_device_register - allocate and register a root device
|
|
* @name: root device name
|
|
* @owner: owner module of the root device, usually THIS_MODULE
|
|
*
|
|
* This function allocates a root device and registers it
|
|
* using device_register(). In order to free the returned
|
|
* device, use root_device_unregister().
|
|
*
|
|
* Root devices are dummy devices which allow other devices
|
|
* to be grouped under /sys/devices. Use this function to
|
|
* allocate a root device and then use it as the parent of
|
|
* any device which should appear under /sys/devices/{name}
|
|
*
|
|
* The /sys/devices/{name} directory will also contain a
|
|
* 'module' symlink which points to the @owner directory
|
|
* in sysfs.
|
|
*
|
|
* Returns &struct device pointer on success, or ERR_PTR() on error.
|
|
*
|
|
* Note: You probably want to use root_device_register().
|
|
*/
|
|
struct device *__root_device_register(const char *name, struct module *owner)
|
|
{
|
|
struct root_device *root;
|
|
int err = -ENOMEM;
|
|
|
|
root = kzalloc(sizeof(struct root_device), GFP_KERNEL);
|
|
if (!root)
|
|
return ERR_PTR(err);
|
|
|
|
err = dev_set_name(&root->dev, "%s", name);
|
|
if (err) {
|
|
kfree(root);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
root->dev.release = root_device_release;
|
|
|
|
err = device_register(&root->dev);
|
|
if (err) {
|
|
put_device(&root->dev);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
#ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */
|
|
if (owner) {
|
|
struct module_kobject *mk = &owner->mkobj;
|
|
|
|
err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module");
|
|
if (err) {
|
|
device_unregister(&root->dev);
|
|
return ERR_PTR(err);
|
|
}
|
|
root->owner = owner;
|
|
}
|
|
#endif
|
|
|
|
return &root->dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__root_device_register);
|
|
|
|
/**
|
|
* root_device_unregister - unregister and free a root device
|
|
* @dev: device going away
|
|
*
|
|
* This function unregisters and cleans up a device that was created by
|
|
* root_device_register().
|
|
*/
|
|
void root_device_unregister(struct device *dev)
|
|
{
|
|
struct root_device *root = to_root_device(dev);
|
|
|
|
if (root->owner)
|
|
sysfs_remove_link(&root->dev.kobj, "module");
|
|
|
|
device_unregister(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(root_device_unregister);
|
|
|
|
|
|
static void device_create_release(struct device *dev)
|
|
{
|
|
pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
|
|
kfree(dev);
|
|
}
|
|
|
|
/**
|
|
* device_create_vargs - creates a device and registers it with sysfs
|
|
* @class: pointer to the struct class that this device should be registered to
|
|
* @parent: pointer to the parent struct device of this new device, if any
|
|
* @devt: the dev_t for the char device to be added
|
|
* @drvdata: the data to be added to the device for callbacks
|
|
* @fmt: string for the device's name
|
|
* @args: va_list for the device's name
|
|
*
|
|
* This function can be used by char device classes. A struct device
|
|
* will be created in sysfs, registered to the specified class.
|
|
*
|
|
* A "dev" file will be created, showing the dev_t for the device, if
|
|
* the dev_t is not 0,0.
|
|
* If a pointer to a parent struct device is passed in, the newly created
|
|
* struct device will be a child of that device in sysfs.
|
|
* The pointer to the struct device will be returned from the call.
|
|
* Any further sysfs files that might be required can be created using this
|
|
* pointer.
|
|
*
|
|
* Returns &struct device pointer on success, or ERR_PTR() on error.
|
|
*
|
|
* Note: the struct class passed to this function must have previously
|
|
* been created with a call to class_create().
|
|
*/
|
|
struct device *device_create_vargs(struct class *class, struct device *parent,
|
|
dev_t devt, void *drvdata, const char *fmt,
|
|
va_list args)
|
|
{
|
|
struct device *dev = NULL;
|
|
int retval = -ENODEV;
|
|
|
|
if (class == NULL || IS_ERR(class))
|
|
goto error;
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev) {
|
|
retval = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
dev->devt = devt;
|
|
dev->class = class;
|
|
dev->parent = parent;
|
|
dev->release = device_create_release;
|
|
dev_set_drvdata(dev, drvdata);
|
|
|
|
retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
|
|
if (retval)
|
|
goto error;
|
|
|
|
retval = device_register(dev);
|
|
if (retval)
|
|
goto error;
|
|
|
|
return dev;
|
|
|
|
error:
|
|
put_device(dev);
|
|
return ERR_PTR(retval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_create_vargs);
|
|
|
|
/**
|
|
* device_create - creates a device and registers it with sysfs
|
|
* @class: pointer to the struct class that this device should be registered to
|
|
* @parent: pointer to the parent struct device of this new device, if any
|
|
* @devt: the dev_t for the char device to be added
|
|
* @drvdata: the data to be added to the device for callbacks
|
|
* @fmt: string for the device's name
|
|
*
|
|
* This function can be used by char device classes. A struct device
|
|
* will be created in sysfs, registered to the specified class.
|
|
*
|
|
* A "dev" file will be created, showing the dev_t for the device, if
|
|
* the dev_t is not 0,0.
|
|
* If a pointer to a parent struct device is passed in, the newly created
|
|
* struct device will be a child of that device in sysfs.
|
|
* The pointer to the struct device will be returned from the call.
|
|
* Any further sysfs files that might be required can be created using this
|
|
* pointer.
|
|
*
|
|
* Returns &struct device pointer on success, or ERR_PTR() on error.
|
|
*
|
|
* Note: the struct class passed to this function must have previously
|
|
* been created with a call to class_create().
|
|
*/
|
|
struct device *device_create(struct class *class, struct device *parent,
|
|
dev_t devt, void *drvdata, const char *fmt, ...)
|
|
{
|
|
va_list vargs;
|
|
struct device *dev;
|
|
|
|
va_start(vargs, fmt);
|
|
dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
|
|
va_end(vargs);
|
|
return dev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_create);
|
|
|
|
static int __match_devt(struct device *dev, const void *data)
|
|
{
|
|
const dev_t *devt = data;
|
|
|
|
return dev->devt == *devt;
|
|
}
|
|
|
|
/**
|
|
* device_destroy - removes a device that was created with device_create()
|
|
* @class: pointer to the struct class that this device was registered with
|
|
* @devt: the dev_t of the device that was previously registered
|
|
*
|
|
* This call unregisters and cleans up a device that was created with a
|
|
* call to device_create().
|
|
*/
|
|
void device_destroy(struct class *class, dev_t devt)
|
|
{
|
|
struct device *dev;
|
|
|
|
dev = class_find_device(class, NULL, &devt, __match_devt);
|
|
if (dev) {
|
|
put_device(dev);
|
|
device_unregister(dev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_destroy);
|
|
|
|
/**
|
|
* device_rename - renames a device
|
|
* @dev: the pointer to the struct device to be renamed
|
|
* @new_name: the new name of the device
|
|
*
|
|
* It is the responsibility of the caller to provide mutual
|
|
* exclusion between two different calls of device_rename
|
|
* on the same device to ensure that new_name is valid and
|
|
* won't conflict with other devices.
|
|
*
|
|
* Note: Don't call this function. Currently, the networking layer calls this
|
|
* function, but that will change. The following text from Kay Sievers offers
|
|
* some insight:
|
|
*
|
|
* Renaming devices is racy at many levels, symlinks and other stuff are not
|
|
* replaced atomically, and you get a "move" uevent, but it's not easy to
|
|
* connect the event to the old and new device. Device nodes are not renamed at
|
|
* all, there isn't even support for that in the kernel now.
|
|
*
|
|
* In the meantime, during renaming, your target name might be taken by another
|
|
* driver, creating conflicts. Or the old name is taken directly after you
|
|
* renamed it -- then you get events for the same DEVPATH, before you even see
|
|
* the "move" event. It's just a mess, and nothing new should ever rely on
|
|
* kernel device renaming. Besides that, it's not even implemented now for
|
|
* other things than (driver-core wise very simple) network devices.
|
|
*
|
|
* We are currently about to change network renaming in udev to completely
|
|
* disallow renaming of devices in the same namespace as the kernel uses,
|
|
* because we can't solve the problems properly, that arise with swapping names
|
|
* of multiple interfaces without races. Means, renaming of eth[0-9]* will only
|
|
* be allowed to some other name than eth[0-9]*, for the aforementioned
|
|
* reasons.
|
|
*
|
|
* Make up a "real" name in the driver before you register anything, or add
|
|
* some other attributes for userspace to find the device, or use udev to add
|
|
* symlinks -- but never rename kernel devices later, it's a complete mess. We
|
|
* don't even want to get into that and try to implement the missing pieces in
|
|
* the core. We really have other pieces to fix in the driver core mess. :)
|
|
*/
|
|
int device_rename(struct device *dev, const char *new_name)
|
|
{
|
|
char *old_device_name = NULL;
|
|
int error;
|
|
|
|
dev = get_device(dev);
|
|
if (!dev)
|
|
return -EINVAL;
|
|
|
|
pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
|
|
__func__, new_name);
|
|
|
|
old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
|
|
if (!old_device_name) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (dev->class) {
|
|
error = sysfs_rename_link(&dev->class->p->subsys.kobj,
|
|
&dev->kobj, old_device_name, new_name);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
error = kobject_rename(&dev->kobj, new_name);
|
|
if (error)
|
|
goto out;
|
|
|
|
out:
|
|
put_device(dev);
|
|
|
|
kfree(old_device_name);
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_rename);
|
|
|
|
static int device_move_class_links(struct device *dev,
|
|
struct device *old_parent,
|
|
struct device *new_parent)
|
|
{
|
|
int error = 0;
|
|
|
|
if (old_parent)
|
|
sysfs_remove_link(&dev->kobj, "device");
|
|
if (new_parent)
|
|
error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
|
|
"device");
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* device_move - moves a device to a new parent
|
|
* @dev: the pointer to the struct device to be moved
|
|
* @new_parent: the new parent of the device (can by NULL)
|
|
* @dpm_order: how to reorder the dpm_list
|
|
*/
|
|
int device_move(struct device *dev, struct device *new_parent,
|
|
enum dpm_order dpm_order)
|
|
{
|
|
int error;
|
|
struct device *old_parent;
|
|
struct kobject *new_parent_kobj;
|
|
|
|
dev = get_device(dev);
|
|
if (!dev)
|
|
return -EINVAL;
|
|
|
|
device_pm_lock();
|
|
new_parent = get_device(new_parent);
|
|
new_parent_kobj = get_device_parent(dev, new_parent);
|
|
|
|
pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
|
|
__func__, new_parent ? dev_name(new_parent) : "<NULL>");
|
|
error = kobject_move(&dev->kobj, new_parent_kobj);
|
|
if (error) {
|
|
cleanup_glue_dir(dev, new_parent_kobj);
|
|
put_device(new_parent);
|
|
goto out;
|
|
}
|
|
old_parent = dev->parent;
|
|
dev->parent = new_parent;
|
|
if (old_parent)
|
|
klist_remove(&dev->p->knode_parent);
|
|
if (new_parent) {
|
|
klist_add_tail(&dev->p->knode_parent,
|
|
&new_parent->p->klist_children);
|
|
set_dev_node(dev, dev_to_node(new_parent));
|
|
}
|
|
|
|
if (dev->class) {
|
|
error = device_move_class_links(dev, old_parent, new_parent);
|
|
if (error) {
|
|
/* We ignore errors on cleanup since we're hosed anyway... */
|
|
device_move_class_links(dev, new_parent, old_parent);
|
|
if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
|
|
if (new_parent)
|
|
klist_remove(&dev->p->knode_parent);
|
|
dev->parent = old_parent;
|
|
if (old_parent) {
|
|
klist_add_tail(&dev->p->knode_parent,
|
|
&old_parent->p->klist_children);
|
|
set_dev_node(dev, dev_to_node(old_parent));
|
|
}
|
|
}
|
|
cleanup_glue_dir(dev, new_parent_kobj);
|
|
put_device(new_parent);
|
|
goto out;
|
|
}
|
|
}
|
|
switch (dpm_order) {
|
|
case DPM_ORDER_NONE:
|
|
break;
|
|
case DPM_ORDER_DEV_AFTER_PARENT:
|
|
device_pm_move_after(dev, new_parent);
|
|
break;
|
|
case DPM_ORDER_PARENT_BEFORE_DEV:
|
|
device_pm_move_before(new_parent, dev);
|
|
break;
|
|
case DPM_ORDER_DEV_LAST:
|
|
device_pm_move_last(dev);
|
|
break;
|
|
}
|
|
|
|
put_device(old_parent);
|
|
out:
|
|
device_pm_unlock();
|
|
put_device(dev);
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(device_move);
|
|
|
|
/**
|
|
* device_shutdown - call ->shutdown() on each device to shutdown.
|
|
*/
|
|
void device_shutdown(void)
|
|
{
|
|
struct device *dev;
|
|
|
|
spin_lock(&devices_kset->list_lock);
|
|
/*
|
|
* Walk the devices list backward, shutting down each in turn.
|
|
* Beware that device unplug events may also start pulling
|
|
* devices offline, even as the system is shutting down.
|
|
*/
|
|
while (!list_empty(&devices_kset->list)) {
|
|
dev = list_entry(devices_kset->list.prev, struct device,
|
|
kobj.entry);
|
|
|
|
/*
|
|
* hold reference count of device's parent to
|
|
* prevent it from being freed because parent's
|
|
* lock is to be held
|
|
*/
|
|
get_device(dev->parent);
|
|
get_device(dev);
|
|
/*
|
|
* Make sure the device is off the kset list, in the
|
|
* event that dev->*->shutdown() doesn't remove it.
|
|
*/
|
|
list_del_init(&dev->kobj.entry);
|
|
spin_unlock(&devices_kset->list_lock);
|
|
|
|
/* hold lock to avoid race with probe/release */
|
|
if (dev->parent)
|
|
device_lock(dev->parent);
|
|
device_lock(dev);
|
|
|
|
/* Don't allow any more runtime suspends */
|
|
pm_runtime_get_noresume(dev);
|
|
pm_runtime_barrier(dev);
|
|
|
|
if (dev->bus && dev->bus->shutdown) {
|
|
if (initcall_debug)
|
|
dev_info(dev, "shutdown\n");
|
|
dev->bus->shutdown(dev);
|
|
} else if (dev->driver && dev->driver->shutdown) {
|
|
if (initcall_debug)
|
|
dev_info(dev, "shutdown\n");
|
|
dev->driver->shutdown(dev);
|
|
}
|
|
|
|
device_unlock(dev);
|
|
if (dev->parent)
|
|
device_unlock(dev->parent);
|
|
|
|
put_device(dev);
|
|
put_device(dev->parent);
|
|
|
|
spin_lock(&devices_kset->list_lock);
|
|
}
|
|
spin_unlock(&devices_kset->list_lock);
|
|
async_synchronize_full();
|
|
}
|
|
|
|
/*
|
|
* Device logging functions
|
|
*/
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
static int
|
|
create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen)
|
|
{
|
|
const char *subsys;
|
|
size_t pos = 0;
|
|
|
|
if (dev->class)
|
|
subsys = dev->class->name;
|
|
else if (dev->bus)
|
|
subsys = dev->bus->name;
|
|
else
|
|
return 0;
|
|
|
|
pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys);
|
|
|
|
/*
|
|
* Add device identifier DEVICE=:
|
|
* b12:8 block dev_t
|
|
* c127:3 char dev_t
|
|
* n8 netdev ifindex
|
|
* +sound:card0 subsystem:devname
|
|
*/
|
|
if (MAJOR(dev->devt)) {
|
|
char c;
|
|
|
|
if (strcmp(subsys, "block") == 0)
|
|
c = 'b';
|
|
else
|
|
c = 'c';
|
|
pos++;
|
|
pos += snprintf(hdr + pos, hdrlen - pos,
|
|
"DEVICE=%c%u:%u",
|
|
c, MAJOR(dev->devt), MINOR(dev->devt));
|
|
} else if (strcmp(subsys, "net") == 0) {
|
|
struct net_device *net = to_net_dev(dev);
|
|
|
|
pos++;
|
|
pos += snprintf(hdr + pos, hdrlen - pos,
|
|
"DEVICE=n%u", net->ifindex);
|
|
} else {
|
|
pos++;
|
|
pos += snprintf(hdr + pos, hdrlen - pos,
|
|
"DEVICE=+%s:%s", subsys, dev_name(dev));
|
|
}
|
|
|
|
return pos;
|
|
}
|
|
EXPORT_SYMBOL(create_syslog_header);
|
|
|
|
int dev_vprintk_emit(int level, const struct device *dev,
|
|
const char *fmt, va_list args)
|
|
{
|
|
char hdr[128];
|
|
size_t hdrlen;
|
|
|
|
hdrlen = create_syslog_header(dev, hdr, sizeof(hdr));
|
|
|
|
return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args);
|
|
}
|
|
EXPORT_SYMBOL(dev_vprintk_emit);
|
|
|
|
int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int r;
|
|
|
|
va_start(args, fmt);
|
|
|
|
r = dev_vprintk_emit(level, dev, fmt, args);
|
|
|
|
va_end(args);
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL(dev_printk_emit);
|
|
|
|
static int __dev_printk(const char *level, const struct device *dev,
|
|
struct va_format *vaf)
|
|
{
|
|
if (!dev)
|
|
return printk("%s(NULL device *): %pV", level, vaf);
|
|
|
|
return dev_printk_emit(level[1] - '0', dev,
|
|
"%s %s: %pV",
|
|
dev_driver_string(dev), dev_name(dev), vaf);
|
|
}
|
|
|
|
int dev_printk(const char *level, const struct device *dev,
|
|
const char *fmt, ...)
|
|
{
|
|
struct va_format vaf;
|
|
va_list args;
|
|
int r;
|
|
|
|
va_start(args, fmt);
|
|
|
|
vaf.fmt = fmt;
|
|
vaf.va = &args;
|
|
|
|
r = __dev_printk(level, dev, &vaf);
|
|
|
|
va_end(args);
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL(dev_printk);
|
|
|
|
#define define_dev_printk_level(func, kern_level) \
|
|
int func(const struct device *dev, const char *fmt, ...) \
|
|
{ \
|
|
struct va_format vaf; \
|
|
va_list args; \
|
|
int r; \
|
|
\
|
|
va_start(args, fmt); \
|
|
\
|
|
vaf.fmt = fmt; \
|
|
vaf.va = &args; \
|
|
\
|
|
r = __dev_printk(kern_level, dev, &vaf); \
|
|
\
|
|
va_end(args); \
|
|
\
|
|
return r; \
|
|
} \
|
|
EXPORT_SYMBOL(func);
|
|
|
|
define_dev_printk_level(dev_emerg, KERN_EMERG);
|
|
define_dev_printk_level(dev_alert, KERN_ALERT);
|
|
define_dev_printk_level(dev_crit, KERN_CRIT);
|
|
define_dev_printk_level(dev_err, KERN_ERR);
|
|
define_dev_printk_level(dev_warn, KERN_WARNING);
|
|
define_dev_printk_level(dev_notice, KERN_NOTICE);
|
|
define_dev_printk_level(_dev_info, KERN_INFO);
|
|
|
|
#endif
|