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![Marcin Niestroj](/assets/img/avatar_default.png)
In case oldtrig == trig == NULL (which happens when we set none trigger, when there is already none set) there is a NULL pointer dereference during iio_trigger_put(trig). Below is kernel output when this occurs: [ 26.741790] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 26.750179] pgd = cacc0000 [ 26.752936] [00000000] *pgd=8adc6835, *pte=00000000, *ppte=00000000 [ 26.759531] Internal error: Oops: 17 [#1] SMP ARM [ 26.764261] Modules linked in: usb_f_ncm u_ether usb_f_acm u_serial usb_f_fs libcomposite configfs evbug [ 26.773844] CPU: 0 PID: 152 Comm: synchro Not tainted 4.12.0-rc1 #2 [ 26.780128] Hardware name: Freescale i.MX6 Ultralite (Device Tree) [ 26.786329] task: cb1de200 task.stack: cac92000 [ 26.790892] PC is at iio_trigger_write_current+0x188/0x1f4 [ 26.796403] LR is at lock_release+0xf8/0x20c [ 26.800696] pc : [<c0736f34>] lr : [<c016efb0>] psr: 600d0013 [ 26.800696] sp : cac93e30 ip : cac93db0 fp : cac93e5c [ 26.812193] r10: c0e64fe8 r9 : 00000000 r8 : 00000001 [ 26.817436] r7 : cb190810 r6 : 00000010 r5 : 00000001 r4 : 00000000 [ 26.823982] r3 : 00000000 r2 : 00000000 r1 : cb1de200 r0 : 00000000 [ 26.830528] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 26.837683] Control: 10c5387d Table: 8acc006a DAC: 00000051 [ 26.843448] Process synchro (pid: 152, stack limit = 0xcac92210) [ 26.849475] Stack: (0xcac93e30 to 0xcac94000) [ 26.853857] 3e20: 00000001 c0736dac c054033c cae6b680 [ 26.862060] 3e40: cae6b680 00000000 00000001 cb3f8610 cac93e74 cac93e60 c054035c c0736db8 [ 26.870264] 3e60: 00000001 c054033c cac93e94 cac93e78 c029bf34 c0540348 00000000 00000000 [ 26.878469] 3e80: cb3f8600 cae6b680 cac93ed4 cac93e98 c029b320 c029bef0 00000000 00000000 [ 26.886672] 3ea0: 00000000 cac93f78 cb2d41fc caed3280 c029b214 cac93f78 00000001 000e20f8 [ 26.894874] 3ec0: 00000001 00000000 cac93f44 cac93ed8 c0221dcc c029b220 c0e1ca39 cb2d41fc [ 26.903079] 3ee0: cac93f04 cac93ef0 c0183ef0 c0183ab0 cb2d41fc 00000000 cac93f44 cac93f08 [ 26.911282] 3f00: c0225eec c0183ebc 00000001 00000000 c0223728 00000000 c0245454 00000001 [ 26.919485] 3f20: 00000001 caed3280 000e20f8 cac93f78 000e20f8 00000001 cac93f74 cac93f48 [ 26.927690] 3f40: c0223680 c0221da4 c0246520 c0245460 caed3283 caed3280 00000000 00000000 [ 26.935893] 3f60: 000e20f8 00000001 cac93fa4 cac93f78 c0224520 c02235e4 00000000 00000000 [ 26.944096] 3f80: 00000001 000e20f8 00000001 00000004 c0107f84 cac92000 00000000 cac93fa8 [ 26.952299] 3fa0: c0107de0 c02244e8 00000001 000e20f80000000e
000e20f8 00000001 fbad2484 [ 26.960502] 3fc0: 00000001 000e20f8 00000001 00000004 beb6b698 00064260 0006421c beb6b4b4 [ 26.968705] 3fe0: 00000000 beb6b450 b6f219a0 b6e2f268 800d00100000000e
cac93ff4 cac93ffc [ 26.976896] Backtrace: [ 26.979388] [<c0736dac>] (iio_trigger_write_current) from [<c054035c>] (dev_attr_store+0x20/0x2c) [ 26.988289] r10:cb3f8610 r9:00000001 r8:00000000 r7:cae6b680 r6:cae6b680 r5:c054033c [ 26.996138] r4:c0736dac r3:00000001 [ 26.999747] [<c054033c>] (dev_attr_store) from [<c029bf34>] (sysfs_kf_write+0x50/0x54) [ 27.007686] r5:c054033c r4:00000001 [ 27.011290] [<c029bee4>] (sysfs_kf_write) from [<c029b320>] (kernfs_fop_write+0x10c/0x224) [ 27.019579] r7:cae6b680 r6:cb3f8600 r5:00000000 r4:00000000 [ 27.025271] [<c029b214>] (kernfs_fop_write) from [<c0221dcc>] (__vfs_write+0x34/0x120) [ 27.033214] r10:00000000 r9:00000001 r8:000e20f8 r7:00000001 r6:cac93f78 r5:c029b214 [ 27.041059] r4:caed3280 [ 27.043622] [<c0221d98>] (__vfs_write) from [<c0223680>] (vfs_write+0xa8/0x170) [ 27.050959] r9:00000001 r8:000e20f8 r7:cac93f78 r6:000e20f8 r5:caed3280 r4:00000001 [ 27.058731] [<c02235d8>] (vfs_write) from [<c0224520>] (SyS_write+0x44/0x98) [ 27.065806] r9:00000001 r8:000e20f8 r7:00000000 r6:00000000 r5:caed3280 r4:caed3283 [ 27.073582] [<c02244dc>] (SyS_write) from [<c0107de0>] (ret_fast_syscall+0x0/0x1c) [ 27.081179] r9:cac92000 r8:c0107f84 r7:00000004 r6:00000001 r5:000e20f8 r4:00000001 [ 27.088947] Code: 1a000009 e1a04009 e3a06010 e1a05008 (e5943000) [ 27.095244] ---[ end trace 06d1dab86d6e6bab ]--- To fix that problem call iio_trigger_put(trig) only when trig is not NULL. Fixes:d5d24bcc0a
("iio: trigger: close race condition in acquiring trigger reference") Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
771 lines
20 KiB
C
771 lines
20 KiB
C
/* The industrial I/O core, trigger handling functions
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/idr.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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#include "iio_core.h"
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#include "iio_core_trigger.h"
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#include <linux/iio/trigger_consumer.h>
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/* RFC - Question of approach
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* Make the common case (single sensor single trigger)
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* simple by starting trigger capture from when first sensors
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* is added.
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*
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* Complex simultaneous start requires use of 'hold' functionality
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* of the trigger. (not implemented)
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*
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* Any other suggestions?
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*/
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static DEFINE_IDA(iio_trigger_ida);
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/* Single list of all available triggers */
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static LIST_HEAD(iio_trigger_list);
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static DEFINE_MUTEX(iio_trigger_list_lock);
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/**
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* iio_trigger_read_name() - retrieve useful identifying name
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* @dev: device associated with the iio_trigger
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* @attr: pointer to the device_attribute structure that is
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* being processed
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* @buf: buffer to print the name into
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*
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* Return: a negative number on failure or the number of written
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* characters on success.
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*/
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static ssize_t iio_trigger_read_name(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 iio_trigger *trig = to_iio_trigger(dev);
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return sprintf(buf, "%s\n", trig->name);
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}
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static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
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static struct attribute *iio_trig_dev_attrs[] = {
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&dev_attr_name.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(iio_trig_dev);
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static struct iio_trigger *__iio_trigger_find_by_name(const char *name);
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int iio_trigger_register(struct iio_trigger *trig_info)
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{
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int ret;
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/* trig_info->ops is required for the module member */
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if (!trig_info->ops)
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return -EINVAL;
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trig_info->id = ida_simple_get(&iio_trigger_ida, 0, 0, GFP_KERNEL);
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if (trig_info->id < 0)
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return trig_info->id;
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/* Set the name used for the sysfs directory etc */
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dev_set_name(&trig_info->dev, "trigger%ld",
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(unsigned long) trig_info->id);
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ret = device_add(&trig_info->dev);
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if (ret)
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goto error_unregister_id;
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/* Add to list of available triggers held by the IIO core */
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mutex_lock(&iio_trigger_list_lock);
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if (__iio_trigger_find_by_name(trig_info->name)) {
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pr_err("Duplicate trigger name '%s'\n", trig_info->name);
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ret = -EEXIST;
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goto error_device_del;
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}
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list_add_tail(&trig_info->list, &iio_trigger_list);
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mutex_unlock(&iio_trigger_list_lock);
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return 0;
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error_device_del:
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mutex_unlock(&iio_trigger_list_lock);
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device_del(&trig_info->dev);
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error_unregister_id:
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ida_simple_remove(&iio_trigger_ida, trig_info->id);
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return ret;
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}
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EXPORT_SYMBOL(iio_trigger_register);
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void iio_trigger_unregister(struct iio_trigger *trig_info)
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{
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mutex_lock(&iio_trigger_list_lock);
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list_del(&trig_info->list);
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mutex_unlock(&iio_trigger_list_lock);
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ida_simple_remove(&iio_trigger_ida, trig_info->id);
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/* Possible issue in here */
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device_del(&trig_info->dev);
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}
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EXPORT_SYMBOL(iio_trigger_unregister);
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int iio_trigger_set_immutable(struct iio_dev *indio_dev, struct iio_trigger *trig)
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{
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if (!indio_dev || !trig)
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return -EINVAL;
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mutex_lock(&indio_dev->mlock);
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WARN_ON(indio_dev->trig_readonly);
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indio_dev->trig = iio_trigger_get(trig);
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indio_dev->trig_readonly = true;
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mutex_unlock(&indio_dev->mlock);
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return 0;
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}
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EXPORT_SYMBOL(iio_trigger_set_immutable);
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/* Search for trigger by name, assuming iio_trigger_list_lock held */
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static struct iio_trigger *__iio_trigger_find_by_name(const char *name)
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{
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struct iio_trigger *iter;
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list_for_each_entry(iter, &iio_trigger_list, list)
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if (!strcmp(iter->name, name))
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return iter;
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return NULL;
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}
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static struct iio_trigger *iio_trigger_acquire_by_name(const char *name)
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{
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struct iio_trigger *trig = NULL, *iter;
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mutex_lock(&iio_trigger_list_lock);
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list_for_each_entry(iter, &iio_trigger_list, list)
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if (sysfs_streq(iter->name, name)) {
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trig = iter;
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iio_trigger_get(trig);
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break;
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}
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mutex_unlock(&iio_trigger_list_lock);
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return trig;
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}
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void iio_trigger_poll(struct iio_trigger *trig)
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{
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int i;
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if (!atomic_read(&trig->use_count)) {
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atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
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for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
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if (trig->subirqs[i].enabled)
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generic_handle_irq(trig->subirq_base + i);
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else
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iio_trigger_notify_done(trig);
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}
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}
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}
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EXPORT_SYMBOL(iio_trigger_poll);
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irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
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{
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iio_trigger_poll(private);
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return IRQ_HANDLED;
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}
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EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
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void iio_trigger_poll_chained(struct iio_trigger *trig)
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{
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int i;
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if (!atomic_read(&trig->use_count)) {
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atomic_set(&trig->use_count, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
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for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
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if (trig->subirqs[i].enabled)
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handle_nested_irq(trig->subirq_base + i);
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else
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iio_trigger_notify_done(trig);
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}
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}
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}
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EXPORT_SYMBOL(iio_trigger_poll_chained);
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void iio_trigger_notify_done(struct iio_trigger *trig)
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{
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if (atomic_dec_and_test(&trig->use_count) && trig->ops->try_reenable)
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if (trig->ops->try_reenable(trig))
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/* Missed an interrupt so launch new poll now */
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iio_trigger_poll(trig);
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}
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EXPORT_SYMBOL(iio_trigger_notify_done);
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/* Trigger Consumer related functions */
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static int iio_trigger_get_irq(struct iio_trigger *trig)
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{
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int ret;
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mutex_lock(&trig->pool_lock);
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ret = bitmap_find_free_region(trig->pool,
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CONFIG_IIO_CONSUMERS_PER_TRIGGER,
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ilog2(1));
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mutex_unlock(&trig->pool_lock);
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if (ret >= 0)
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ret += trig->subirq_base;
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return ret;
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}
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static void iio_trigger_put_irq(struct iio_trigger *trig, int irq)
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{
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mutex_lock(&trig->pool_lock);
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clear_bit(irq - trig->subirq_base, trig->pool);
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mutex_unlock(&trig->pool_lock);
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}
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/* Complexity in here. With certain triggers (datardy) an acknowledgement
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* may be needed if the pollfuncs do not include the data read for the
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* triggering device.
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* This is not currently handled. Alternative of not enabling trigger unless
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* the relevant function is in there may be the best option.
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*/
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/* Worth protecting against double additions? */
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static int iio_trigger_attach_poll_func(struct iio_trigger *trig,
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struct iio_poll_func *pf)
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{
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int ret = 0;
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bool notinuse
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= bitmap_empty(trig->pool, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
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/* Prevent the module from being removed whilst attached to a trigger */
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__module_get(pf->indio_dev->info->driver_module);
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/* Get irq number */
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pf->irq = iio_trigger_get_irq(trig);
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if (pf->irq < 0)
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goto out_put_module;
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/* Request irq */
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ret = request_threaded_irq(pf->irq, pf->h, pf->thread,
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pf->type, pf->name,
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pf);
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if (ret < 0)
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goto out_put_irq;
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/* Enable trigger in driver */
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if (trig->ops->set_trigger_state && notinuse) {
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ret = trig->ops->set_trigger_state(trig, true);
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if (ret < 0)
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goto out_free_irq;
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}
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/*
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* Check if we just registered to our own trigger: we determine that
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* this is the case if the IIO device and the trigger device share the
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* same parent device.
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*/
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if (pf->indio_dev->dev.parent == trig->dev.parent)
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trig->attached_own_device = true;
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return ret;
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out_free_irq:
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free_irq(pf->irq, pf);
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out_put_irq:
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iio_trigger_put_irq(trig, pf->irq);
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out_put_module:
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module_put(pf->indio_dev->info->driver_module);
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return ret;
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}
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static int iio_trigger_detach_poll_func(struct iio_trigger *trig,
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struct iio_poll_func *pf)
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{
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int ret = 0;
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bool no_other_users
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= (bitmap_weight(trig->pool,
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CONFIG_IIO_CONSUMERS_PER_TRIGGER)
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== 1);
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if (trig->ops->set_trigger_state && no_other_users) {
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ret = trig->ops->set_trigger_state(trig, false);
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if (ret)
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return ret;
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}
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if (pf->indio_dev->dev.parent == trig->dev.parent)
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trig->attached_own_device = false;
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iio_trigger_put_irq(trig, pf->irq);
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free_irq(pf->irq, pf);
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module_put(pf->indio_dev->info->driver_module);
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return ret;
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}
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irqreturn_t iio_pollfunc_store_time(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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pf->timestamp = iio_get_time_ns(pf->indio_dev);
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return IRQ_WAKE_THREAD;
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}
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EXPORT_SYMBOL(iio_pollfunc_store_time);
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struct iio_poll_func
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*iio_alloc_pollfunc(irqreturn_t (*h)(int irq, void *p),
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irqreturn_t (*thread)(int irq, void *p),
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int type,
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struct iio_dev *indio_dev,
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const char *fmt,
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...)
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{
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va_list vargs;
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struct iio_poll_func *pf;
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pf = kmalloc(sizeof *pf, GFP_KERNEL);
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if (pf == NULL)
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return NULL;
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va_start(vargs, fmt);
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pf->name = kvasprintf(GFP_KERNEL, fmt, vargs);
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va_end(vargs);
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if (pf->name == NULL) {
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kfree(pf);
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return NULL;
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}
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pf->h = h;
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pf->thread = thread;
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pf->type = type;
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pf->indio_dev = indio_dev;
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return pf;
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}
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EXPORT_SYMBOL_GPL(iio_alloc_pollfunc);
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void iio_dealloc_pollfunc(struct iio_poll_func *pf)
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{
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kfree(pf->name);
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kfree(pf);
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}
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EXPORT_SYMBOL_GPL(iio_dealloc_pollfunc);
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/**
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* iio_trigger_read_current() - trigger consumer sysfs query current trigger
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* @dev: device associated with an industrial I/O device
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* @attr: pointer to the device_attribute structure that
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* is being processed
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* @buf: buffer where the current trigger name will be printed into
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*
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* For trigger consumers the current_trigger interface allows the trigger
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* used by the device to be queried.
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*
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* Return: a negative number on failure, the number of characters written
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* on success or 0 if no trigger is available
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*/
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static ssize_t iio_trigger_read_current(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 iio_dev *indio_dev = dev_to_iio_dev(dev);
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if (indio_dev->trig)
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return sprintf(buf, "%s\n", indio_dev->trig->name);
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return 0;
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}
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/**
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* iio_trigger_write_current() - trigger consumer sysfs set current trigger
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* @dev: device associated with an industrial I/O device
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* @attr: device attribute that is being processed
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* @buf: string buffer that holds the name of the trigger
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* @len: length of the trigger name held by buf
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*
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* For trigger consumers the current_trigger interface allows the trigger
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|
* used for this device to be specified at run time based on the trigger's
|
|
* name.
|
|
*
|
|
* Return: negative error code on failure or length of the buffer
|
|
* on success
|
|
*/
|
|
static ssize_t iio_trigger_write_current(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
|
|
struct iio_trigger *oldtrig = indio_dev->trig;
|
|
struct iio_trigger *trig;
|
|
int ret;
|
|
|
|
mutex_lock(&indio_dev->mlock);
|
|
if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
|
|
mutex_unlock(&indio_dev->mlock);
|
|
return -EBUSY;
|
|
}
|
|
if (indio_dev->trig_readonly) {
|
|
mutex_unlock(&indio_dev->mlock);
|
|
return -EPERM;
|
|
}
|
|
mutex_unlock(&indio_dev->mlock);
|
|
|
|
trig = iio_trigger_acquire_by_name(buf);
|
|
if (oldtrig == trig) {
|
|
ret = len;
|
|
goto out_trigger_put;
|
|
}
|
|
|
|
if (trig && indio_dev->info->validate_trigger) {
|
|
ret = indio_dev->info->validate_trigger(indio_dev, trig);
|
|
if (ret)
|
|
goto out_trigger_put;
|
|
}
|
|
|
|
if (trig && trig->ops->validate_device) {
|
|
ret = trig->ops->validate_device(trig, indio_dev);
|
|
if (ret)
|
|
goto out_trigger_put;
|
|
}
|
|
|
|
indio_dev->trig = trig;
|
|
|
|
if (oldtrig) {
|
|
if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
|
|
iio_trigger_detach_poll_func(oldtrig,
|
|
indio_dev->pollfunc_event);
|
|
iio_trigger_put(oldtrig);
|
|
}
|
|
if (indio_dev->trig) {
|
|
if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
|
|
iio_trigger_attach_poll_func(indio_dev->trig,
|
|
indio_dev->pollfunc_event);
|
|
}
|
|
|
|
return len;
|
|
|
|
out_trigger_put:
|
|
if (trig)
|
|
iio_trigger_put(trig);
|
|
return ret;
|
|
}
|
|
|
|
static DEVICE_ATTR(current_trigger, S_IRUGO | S_IWUSR,
|
|
iio_trigger_read_current,
|
|
iio_trigger_write_current);
|
|
|
|
static struct attribute *iio_trigger_consumer_attrs[] = {
|
|
&dev_attr_current_trigger.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group iio_trigger_consumer_attr_group = {
|
|
.name = "trigger",
|
|
.attrs = iio_trigger_consumer_attrs,
|
|
};
|
|
|
|
static void iio_trig_release(struct device *device)
|
|
{
|
|
struct iio_trigger *trig = to_iio_trigger(device);
|
|
int i;
|
|
|
|
if (trig->subirq_base) {
|
|
for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
|
|
irq_modify_status(trig->subirq_base + i,
|
|
IRQ_NOAUTOEN,
|
|
IRQ_NOREQUEST | IRQ_NOPROBE);
|
|
irq_set_chip(trig->subirq_base + i,
|
|
NULL);
|
|
irq_set_handler(trig->subirq_base + i,
|
|
NULL);
|
|
}
|
|
|
|
irq_free_descs(trig->subirq_base,
|
|
CONFIG_IIO_CONSUMERS_PER_TRIGGER);
|
|
}
|
|
kfree(trig->name);
|
|
kfree(trig);
|
|
}
|
|
|
|
static const struct device_type iio_trig_type = {
|
|
.release = iio_trig_release,
|
|
.groups = iio_trig_dev_groups,
|
|
};
|
|
|
|
static void iio_trig_subirqmask(struct irq_data *d)
|
|
{
|
|
struct irq_chip *chip = irq_data_get_irq_chip(d);
|
|
struct iio_trigger *trig
|
|
= container_of(chip,
|
|
struct iio_trigger, subirq_chip);
|
|
trig->subirqs[d->irq - trig->subirq_base].enabled = false;
|
|
}
|
|
|
|
static void iio_trig_subirqunmask(struct irq_data *d)
|
|
{
|
|
struct irq_chip *chip = irq_data_get_irq_chip(d);
|
|
struct iio_trigger *trig
|
|
= container_of(chip,
|
|
struct iio_trigger, subirq_chip);
|
|
trig->subirqs[d->irq - trig->subirq_base].enabled = true;
|
|
}
|
|
|
|
static struct iio_trigger *viio_trigger_alloc(const char *fmt, va_list vargs)
|
|
{
|
|
struct iio_trigger *trig;
|
|
int i;
|
|
|
|
trig = kzalloc(sizeof *trig, GFP_KERNEL);
|
|
if (!trig)
|
|
return NULL;
|
|
|
|
trig->dev.type = &iio_trig_type;
|
|
trig->dev.bus = &iio_bus_type;
|
|
device_initialize(&trig->dev);
|
|
|
|
mutex_init(&trig->pool_lock);
|
|
trig->subirq_base = irq_alloc_descs(-1, 0,
|
|
CONFIG_IIO_CONSUMERS_PER_TRIGGER,
|
|
0);
|
|
if (trig->subirq_base < 0)
|
|
goto free_trig;
|
|
|
|
trig->name = kvasprintf(GFP_KERNEL, fmt, vargs);
|
|
if (trig->name == NULL)
|
|
goto free_descs;
|
|
|
|
trig->subirq_chip.name = trig->name;
|
|
trig->subirq_chip.irq_mask = &iio_trig_subirqmask;
|
|
trig->subirq_chip.irq_unmask = &iio_trig_subirqunmask;
|
|
for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++) {
|
|
irq_set_chip(trig->subirq_base + i, &trig->subirq_chip);
|
|
irq_set_handler(trig->subirq_base + i, &handle_simple_irq);
|
|
irq_modify_status(trig->subirq_base + i,
|
|
IRQ_NOREQUEST | IRQ_NOAUTOEN, IRQ_NOPROBE);
|
|
}
|
|
get_device(&trig->dev);
|
|
|
|
return trig;
|
|
|
|
free_descs:
|
|
irq_free_descs(trig->subirq_base, CONFIG_IIO_CONSUMERS_PER_TRIGGER);
|
|
free_trig:
|
|
kfree(trig);
|
|
return NULL;
|
|
}
|
|
|
|
struct iio_trigger *iio_trigger_alloc(const char *fmt, ...)
|
|
{
|
|
struct iio_trigger *trig;
|
|
va_list vargs;
|
|
|
|
va_start(vargs, fmt);
|
|
trig = viio_trigger_alloc(fmt, vargs);
|
|
va_end(vargs);
|
|
|
|
return trig;
|
|
}
|
|
EXPORT_SYMBOL(iio_trigger_alloc);
|
|
|
|
void iio_trigger_free(struct iio_trigger *trig)
|
|
{
|
|
if (trig)
|
|
put_device(&trig->dev);
|
|
}
|
|
EXPORT_SYMBOL(iio_trigger_free);
|
|
|
|
static void devm_iio_trigger_release(struct device *dev, void *res)
|
|
{
|
|
iio_trigger_free(*(struct iio_trigger **)res);
|
|
}
|
|
|
|
static int devm_iio_trigger_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct iio_trigger **r = res;
|
|
|
|
if (!r || !*r) {
|
|
WARN_ON(!r || !*r);
|
|
return 0;
|
|
}
|
|
|
|
return *r == data;
|
|
}
|
|
|
|
/**
|
|
* devm_iio_trigger_alloc - Resource-managed iio_trigger_alloc()
|
|
* @dev: Device to allocate iio_trigger for
|
|
* @fmt: trigger name format. If it includes format
|
|
* specifiers, the additional arguments following
|
|
* format are formatted and inserted in the resulting
|
|
* string replacing their respective specifiers.
|
|
*
|
|
* Managed iio_trigger_alloc. iio_trigger allocated with this function is
|
|
* automatically freed on driver detach.
|
|
*
|
|
* If an iio_trigger allocated with this function needs to be freed separately,
|
|
* devm_iio_trigger_free() must be used.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to allocated iio_trigger on success, NULL on failure.
|
|
*/
|
|
struct iio_trigger *devm_iio_trigger_alloc(struct device *dev,
|
|
const char *fmt, ...)
|
|
{
|
|
struct iio_trigger **ptr, *trig;
|
|
va_list vargs;
|
|
|
|
ptr = devres_alloc(devm_iio_trigger_release, sizeof(*ptr),
|
|
GFP_KERNEL);
|
|
if (!ptr)
|
|
return NULL;
|
|
|
|
/* use raw alloc_dr for kmalloc caller tracing */
|
|
va_start(vargs, fmt);
|
|
trig = viio_trigger_alloc(fmt, vargs);
|
|
va_end(vargs);
|
|
if (trig) {
|
|
*ptr = trig;
|
|
devres_add(dev, ptr);
|
|
} else {
|
|
devres_free(ptr);
|
|
}
|
|
|
|
return trig;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_trigger_alloc);
|
|
|
|
/**
|
|
* devm_iio_trigger_free - Resource-managed iio_trigger_free()
|
|
* @dev: Device this iio_dev belongs to
|
|
* @iio_trig: the iio_trigger associated with the device
|
|
*
|
|
* Free iio_trigger allocated with devm_iio_trigger_alloc().
|
|
*/
|
|
void devm_iio_trigger_free(struct device *dev, struct iio_trigger *iio_trig)
|
|
{
|
|
int rc;
|
|
|
|
rc = devres_release(dev, devm_iio_trigger_release,
|
|
devm_iio_trigger_match, iio_trig);
|
|
WARN_ON(rc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_trigger_free);
|
|
|
|
static void devm_iio_trigger_unreg(struct device *dev, void *res)
|
|
{
|
|
iio_trigger_unregister(*(struct iio_trigger **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_iio_trigger_register - Resource-managed iio_trigger_register()
|
|
* @dev: device this trigger was allocated for
|
|
* @trig_info: trigger to register
|
|
*
|
|
* Managed iio_trigger_register(). The IIO trigger registered with this
|
|
* function is automatically unregistered on driver detach. This function
|
|
* calls iio_trigger_register() internally. Refer to that function for more
|
|
* information.
|
|
*
|
|
* If an iio_trigger registered with this function needs to be unregistered
|
|
* separately, devm_iio_trigger_unregister() must be used.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, negative error number on failure.
|
|
*/
|
|
int devm_iio_trigger_register(struct device *dev, struct iio_trigger *trig_info)
|
|
{
|
|
struct iio_trigger **ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_iio_trigger_unreg, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
*ptr = trig_info;
|
|
ret = iio_trigger_register(trig_info);
|
|
if (!ret)
|
|
devres_add(dev, ptr);
|
|
else
|
|
devres_free(ptr);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_trigger_register);
|
|
|
|
/**
|
|
* devm_iio_trigger_unregister - Resource-managed iio_trigger_unregister()
|
|
* @dev: device this iio_trigger belongs to
|
|
* @trig_info: the trigger associated with the device
|
|
*
|
|
* Unregister trigger registered with devm_iio_trigger_register().
|
|
*/
|
|
void devm_iio_trigger_unregister(struct device *dev,
|
|
struct iio_trigger *trig_info)
|
|
{
|
|
int rc;
|
|
|
|
rc = devres_release(dev, devm_iio_trigger_unreg, devm_iio_trigger_match,
|
|
trig_info);
|
|
WARN_ON(rc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_iio_trigger_unregister);
|
|
|
|
bool iio_trigger_using_own(struct iio_dev *indio_dev)
|
|
{
|
|
return indio_dev->trig->attached_own_device;
|
|
}
|
|
EXPORT_SYMBOL(iio_trigger_using_own);
|
|
|
|
/**
|
|
* iio_trigger_validate_own_device - Check if a trigger and IIO device belong to
|
|
* the same device
|
|
* @trig: The IIO trigger to check
|
|
* @indio_dev: the IIO device to check
|
|
*
|
|
* This function can be used as the validate_device callback for triggers that
|
|
* can only be attached to their own device.
|
|
*
|
|
* Return: 0 if both the trigger and the IIO device belong to the same
|
|
* device, -EINVAL otherwise.
|
|
*/
|
|
int iio_trigger_validate_own_device(struct iio_trigger *trig,
|
|
struct iio_dev *indio_dev)
|
|
{
|
|
if (indio_dev->dev.parent != trig->dev.parent)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iio_trigger_validate_own_device);
|
|
|
|
void iio_device_register_trigger_consumer(struct iio_dev *indio_dev)
|
|
{
|
|
indio_dev->groups[indio_dev->groupcounter++] =
|
|
&iio_trigger_consumer_attr_group;
|
|
}
|
|
|
|
void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev)
|
|
{
|
|
/* Clean up an associated but not attached trigger reference */
|
|
if (indio_dev->trig)
|
|
iio_trigger_put(indio_dev->trig);
|
|
}
|
|
|
|
int iio_triggered_buffer_postenable(struct iio_dev *indio_dev)
|
|
{
|
|
return iio_trigger_attach_poll_func(indio_dev->trig,
|
|
indio_dev->pollfunc);
|
|
}
|
|
EXPORT_SYMBOL(iio_triggered_buffer_postenable);
|
|
|
|
int iio_triggered_buffer_predisable(struct iio_dev *indio_dev)
|
|
{
|
|
return iio_trigger_detach_poll_func(indio_dev->trig,
|
|
indio_dev->pollfunc);
|
|
}
|
|
EXPORT_SYMBOL(iio_triggered_buffer_predisable);
|