2009-08-18 19:06:19 +02:00
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/* The industrial I/O core
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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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* Based on elements of hwmon and input subsystems.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/idr.h>
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#include <linux/kdev_t.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/poll.h>
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2009-10-12 20:18:09 +02:00
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#include <linux/sched.h>
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2009-10-12 23:10:34 +02:00
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#include <linux/wait.h>
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2009-08-18 19:06:19 +02:00
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#include <linux/cdev.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
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#include <linux/slab.h>
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2009-08-18 19:06:19 +02:00
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#include "iio.h"
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#include "trigger_consumer.h"
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#define IIO_ID_PREFIX "device"
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#define IIO_ID_FORMAT IIO_ID_PREFIX "%d"
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/* IDR to assign each registered device a unique id*/
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2010-09-04 18:54:43 +02:00
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static DEFINE_IDA(iio_ida);
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2009-08-18 19:06:19 +02:00
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/* IDR to allocate character device minor numbers */
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2010-09-04 18:54:43 +02:00
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static DEFINE_IDA(iio_chrdev_ida);
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2009-08-18 19:06:19 +02:00
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/* Lock used to protect both of the above */
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2010-09-04 18:54:43 +02:00
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static DEFINE_SPINLOCK(iio_ida_lock);
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2009-08-18 19:06:19 +02:00
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dev_t iio_devt;
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EXPORT_SYMBOL(iio_devt);
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#define IIO_DEV_MAX 256
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2010-05-04 15:43:00 +02:00
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struct bus_type iio_bus_type = {
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2009-08-18 19:06:19 +02:00
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.name = "iio",
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};
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2010-05-04 15:43:00 +02:00
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EXPORT_SYMBOL(iio_bus_type);
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2009-08-18 19:06:19 +02:00
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void __iio_change_event(struct iio_detected_event_list *ev,
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int ev_code,
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s64 timestamp)
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{
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ev->ev.id = ev_code;
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ev->ev.timestamp = timestamp;
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}
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EXPORT_SYMBOL(__iio_change_event);
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/* Used both in the interrupt line put events and the ring buffer ones */
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/* Note that in it's current form someone has to be listening before events
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* are queued. Hence a client MUST open the chrdev before the ring buffer is
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* switched on.
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*/
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2010-09-26 01:11:09 +02:00
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int __iio_push_event(struct iio_event_interface *ev_int,
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2009-08-18 19:06:19 +02:00
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int ev_code,
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s64 timestamp,
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struct iio_shared_ev_pointer *
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shared_pointer_p)
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{
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struct iio_detected_event_list *ev;
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int ret = 0;
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/* Does anyone care? */
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mutex_lock(&ev_int->event_list_lock);
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if (test_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags)) {
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2010-01-09 17:57:34 +01:00
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if (ev_int->current_events == ev_int->max_events) {
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mutex_unlock(&ev_int->event_list_lock);
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2009-08-18 19:06:19 +02:00
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return 0;
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2010-01-09 17:57:34 +01:00
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}
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2009-08-18 19:06:19 +02:00
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ev = kmalloc(sizeof(*ev), GFP_KERNEL);
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if (ev == NULL) {
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ret = -ENOMEM;
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2010-01-09 17:57:34 +01:00
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mutex_unlock(&ev_int->event_list_lock);
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2009-08-18 19:06:19 +02:00
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goto error_ret;
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}
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ev->ev.id = ev_code;
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ev->ev.timestamp = timestamp;
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ev->shared_pointer = shared_pointer_p;
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if (ev->shared_pointer)
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shared_pointer_p->ev_p = ev;
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list_add_tail(&ev->list, &ev_int->det_events.list);
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ev_int->current_events++;
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mutex_unlock(&ev_int->event_list_lock);
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wake_up_interruptible(&ev_int->wait);
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} else
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mutex_unlock(&ev_int->event_list_lock);
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error_ret:
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return ret;
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}
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EXPORT_SYMBOL(__iio_push_event);
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int iio_push_event(struct iio_dev *dev_info,
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int ev_line,
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int ev_code,
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s64 timestamp)
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{
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return __iio_push_event(&dev_info->event_interfaces[ev_line],
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ev_code, timestamp, NULL);
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}
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EXPORT_SYMBOL(iio_push_event);
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/* Generic interrupt line interrupt handler */
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2010-02-18 18:19:17 +01:00
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static irqreturn_t iio_interrupt_handler(int irq, void *_int_info)
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2009-08-18 19:06:19 +02:00
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{
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struct iio_interrupt *int_info = _int_info;
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struct iio_dev *dev_info = int_info->dev_info;
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struct iio_event_handler_list *p;
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s64 time_ns;
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unsigned long flags;
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spin_lock_irqsave(&int_info->ev_list_lock, flags);
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if (list_empty(&int_info->ev_list)) {
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spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
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return IRQ_NONE;
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}
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time_ns = iio_get_time_ns();
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2010-09-04 18:54:44 +02:00
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list_for_each_entry(p, &int_info->ev_list, list) {
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2009-08-18 19:06:19 +02:00
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disable_irq_nosync(irq);
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p->handler(dev_info, 1, time_ns, !(p->refcount > 1));
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2010-09-04 18:54:44 +02:00
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}
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2009-08-18 19:06:19 +02:00
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spin_unlock_irqrestore(&int_info->ev_list_lock, flags);
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return IRQ_HANDLED;
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}
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static struct iio_interrupt *iio_allocate_interrupt(void)
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{
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struct iio_interrupt *i = kmalloc(sizeof *i, GFP_KERNEL);
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if (i) {
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spin_lock_init(&i->ev_list_lock);
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INIT_LIST_HEAD(&i->ev_list);
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}
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return i;
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}
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/* Confirming the validity of supplied irq is left to drivers.*/
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int iio_register_interrupt_line(unsigned int irq,
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struct iio_dev *dev_info,
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int line_number,
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unsigned long type,
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const char *name)
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{
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int ret;
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dev_info->interrupts[line_number] = iio_allocate_interrupt();
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if (dev_info->interrupts[line_number] == NULL) {
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ret = -ENOMEM;
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goto error_ret;
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}
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dev_info->interrupts[line_number]->line_number = line_number;
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dev_info->interrupts[line_number]->irq = irq;
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dev_info->interrupts[line_number]->dev_info = dev_info;
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/* Possibly only request on demand?
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* Can see this may complicate the handling of interrupts.
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* However, with this approach we might end up handling lots of
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* events no-one cares about.*/
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ret = request_irq(irq,
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&iio_interrupt_handler,
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type,
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name,
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dev_info->interrupts[line_number]);
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error_ret:
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return ret;
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}
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EXPORT_SYMBOL(iio_register_interrupt_line);
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/* This turns up an awful lot */
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ssize_t iio_read_const_attr(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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return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string);
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}
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EXPORT_SYMBOL(iio_read_const_attr);
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/* Before this runs the interrupt generator must have been disabled */
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void iio_unregister_interrupt_line(struct iio_dev *dev_info, int line_number)
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{
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/* make sure the interrupt handlers are all done */
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flush_scheduled_work();
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free_irq(dev_info->interrupts[line_number]->irq,
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dev_info->interrupts[line_number]);
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kfree(dev_info->interrupts[line_number]);
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}
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EXPORT_SYMBOL(iio_unregister_interrupt_line);
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/* Reference counted add and remove */
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void iio_add_event_to_list(struct iio_event_handler_list *el,
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struct list_head *head)
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{
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unsigned long flags;
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struct iio_interrupt *inter = to_iio_interrupt(head);
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/* take mutex to protect this element */
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mutex_lock(&el->exist_lock);
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if (el->refcount == 0) {
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/* Take the event list spin lock */
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spin_lock_irqsave(&inter->ev_list_lock, flags);
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list_add(&el->list, head);
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spin_unlock_irqrestore(&inter->ev_list_lock, flags);
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}
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el->refcount++;
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mutex_unlock(&el->exist_lock);
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}
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EXPORT_SYMBOL(iio_add_event_to_list);
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void iio_remove_event_from_list(struct iio_event_handler_list *el,
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struct list_head *head)
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{
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unsigned long flags;
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struct iio_interrupt *inter = to_iio_interrupt(head);
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mutex_lock(&el->exist_lock);
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el->refcount--;
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if (el->refcount == 0) {
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/* Take the event list spin lock */
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spin_lock_irqsave(&inter->ev_list_lock, flags);
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list_del_init(&el->list);
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spin_unlock_irqrestore(&inter->ev_list_lock, flags);
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}
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mutex_unlock(&el->exist_lock);
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}
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EXPORT_SYMBOL(iio_remove_event_from_list);
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|
2010-02-18 18:19:17 +01:00
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static ssize_t iio_event_chrdev_read(struct file *filep,
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char __user *buf,
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size_t count,
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loff_t *f_ps)
|
2009-08-18 19:06:19 +02:00
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{
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struct iio_event_interface *ev_int = filep->private_data;
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struct iio_detected_event_list *el;
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int ret;
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size_t len;
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mutex_lock(&ev_int->event_list_lock);
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if (list_empty(&ev_int->det_events.list)) {
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if (filep->f_flags & O_NONBLOCK) {
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ret = -EAGAIN;
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goto error_mutex_unlock;
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}
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mutex_unlock(&ev_int->event_list_lock);
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/* Blocking on device; waiting for something to be there */
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ret = wait_event_interruptible(ev_int->wait,
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!list_empty(&ev_int
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->det_events.list));
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if (ret)
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goto error_ret;
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/* Single access device so noone else can get the data */
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mutex_lock(&ev_int->event_list_lock);
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}
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el = list_first_entry(&ev_int->det_events.list,
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struct iio_detected_event_list,
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list);
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len = sizeof el->ev;
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if (copy_to_user(buf, &(el->ev), len)) {
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ret = -EFAULT;
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goto error_mutex_unlock;
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}
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list_del(&el->list);
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ev_int->current_events--;
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mutex_unlock(&ev_int->event_list_lock);
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/*
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* Possible concurency issue if an update of this event is on its way
|
2010-01-09 18:01:33 +01:00
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* through. May lead to new event being removed whilst the reported
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* event was the unescalated event. In typical use case this is not a
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* problem as userspace will say read half the buffer due to a 50%
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* full event which would make the correct 100% full incorrect anyway.
|
2009-08-18 19:06:19 +02:00
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*/
|
2010-01-09 18:01:33 +01:00
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if (el->shared_pointer) {
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spin_lock(&el->shared_pointer->lock);
|
2009-08-18 19:06:19 +02:00
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(el->shared_pointer->ev_p) = NULL;
|
2010-01-09 18:01:33 +01:00
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spin_unlock(&el->shared_pointer->lock);
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}
|
2009-08-18 19:06:19 +02:00
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kfree(el);
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return len;
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error_mutex_unlock:
|
|
|
|
mutex_unlock(&ev_int->event_list_lock);
|
|
|
|
error_ret:
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2010-02-18 18:19:17 +01:00
|
|
|
static int iio_event_chrdev_release(struct inode *inode, struct file *filep)
|
2009-08-18 19:06:19 +02:00
|
|
|
{
|
|
|
|
struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev);
|
|
|
|
struct iio_event_interface *ev_int = hand->private;
|
|
|
|
struct iio_detected_event_list *el, *t;
|
|
|
|
|
|
|
|
mutex_lock(&ev_int->event_list_lock);
|
|
|
|
clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags);
|
|
|
|
/*
|
|
|
|
* In order to maintain a clean state for reopening,
|
|
|
|
* clear out any awaiting events. The mask will prevent
|
|
|
|
* any new __iio_push_event calls running.
|
|
|
|
*/
|
|
|
|
list_for_each_entry_safe(el, t, &ev_int->det_events.list, list) {
|
|
|
|
list_del(&el->list);
|
|
|
|
kfree(el);
|
|
|
|
}
|
|
|
|
mutex_unlock(&ev_int->event_list_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-02-18 18:19:17 +01:00
|
|
|
static int iio_event_chrdev_open(struct inode *inode, struct file *filep)
|
2009-08-18 19:06:19 +02:00
|
|
|
{
|
|
|
|
struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev);
|
|
|
|
struct iio_event_interface *ev_int = hand->private;
|
|
|
|
|
|
|
|
mutex_lock(&ev_int->event_list_lock);
|
|
|
|
if (test_and_set_bit(IIO_BUSY_BIT_POS, &hand->flags)) {
|
|
|
|
fops_put(filep->f_op);
|
|
|
|
mutex_unlock(&ev_int->event_list_lock);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
filep->private_data = hand->private;
|
|
|
|
mutex_unlock(&ev_int->event_list_lock);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct file_operations iio_event_chrdev_fileops = {
|
|
|
|
.read = iio_event_chrdev_read,
|
|
|
|
.release = iio_event_chrdev_release,
|
|
|
|
.open = iio_event_chrdev_open,
|
|
|
|
.owner = THIS_MODULE,
|
llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 18:52:59 +02:00
|
|
|
.llseek = noop_llseek,
|
2009-08-18 19:06:19 +02:00
|
|
|
};
|
|
|
|
|
|
|
|
static void iio_event_dev_release(struct device *dev)
|
|
|
|
{
|
|
|
|
struct iio_event_interface *ev_int
|
|
|
|
= container_of(dev, struct iio_event_interface, dev);
|
|
|
|
cdev_del(&ev_int->handler.chrdev);
|
|
|
|
iio_device_free_chrdev_minor(MINOR(dev->devt));
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct device_type iio_event_type = {
|
|
|
|
.release = iio_event_dev_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
int iio_device_get_chrdev_minor(void)
|
|
|
|
{
|
|
|
|
int ret, val;
|
|
|
|
|
2010-09-04 18:54:43 +02:00
|
|
|
ida_again:
|
|
|
|
if (unlikely(ida_pre_get(&iio_chrdev_ida, GFP_KERNEL) == 0))
|
2009-08-18 19:06:19 +02:00
|
|
|
return -ENOMEM;
|
2010-09-04 18:54:43 +02:00
|
|
|
spin_lock(&iio_ida_lock);
|
|
|
|
ret = ida_get_new(&iio_chrdev_ida, &val);
|
|
|
|
spin_unlock(&iio_ida_lock);
|
2009-08-18 19:06:19 +02:00
|
|
|
if (unlikely(ret == -EAGAIN))
|
2010-09-04 18:54:43 +02:00
|
|
|
goto ida_again;
|
2009-08-18 19:06:19 +02:00
|
|
|
else if (unlikely(ret))
|
|
|
|
return ret;
|
|
|
|
if (val > IIO_DEV_MAX)
|
|
|
|
return -ENOMEM;
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
|
|
|
|
void iio_device_free_chrdev_minor(int val)
|
|
|
|
{
|
2010-09-04 18:54:43 +02:00
|
|
|
spin_lock(&iio_ida_lock);
|
|
|
|
ida_remove(&iio_chrdev_ida, val);
|
|
|
|
spin_unlock(&iio_ida_lock);
|
2009-08-18 19:06:19 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
int iio_setup_ev_int(struct iio_event_interface *ev_int,
|
|
|
|
const char *name,
|
|
|
|
struct module *owner,
|
|
|
|
struct device *dev)
|
|
|
|
{
|
|
|
|
int ret, minor;
|
|
|
|
|
2010-05-04 15:43:00 +02:00
|
|
|
ev_int->dev.bus = &iio_bus_type;
|
2009-08-18 19:06:19 +02:00
|
|
|
ev_int->dev.parent = dev;
|
|
|
|
ev_int->dev.type = &iio_event_type;
|
|
|
|
device_initialize(&ev_int->dev);
|
|
|
|
|
|
|
|
minor = iio_device_get_chrdev_minor();
|
|
|
|
if (minor < 0) {
|
|
|
|
ret = minor;
|
|
|
|
goto error_device_put;
|
|
|
|
}
|
|
|
|
ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor);
|
|
|
|
dev_set_name(&ev_int->dev, "%s", name);
|
|
|
|
|
|
|
|
ret = device_add(&ev_int->dev);
|
|
|
|
if (ret)
|
|
|
|
goto error_free_minor;
|
|
|
|
|
|
|
|
cdev_init(&ev_int->handler.chrdev, &iio_event_chrdev_fileops);
|
|
|
|
ev_int->handler.chrdev.owner = owner;
|
|
|
|
|
|
|
|
mutex_init(&ev_int->event_list_lock);
|
|
|
|
/* discussion point - make this variable? */
|
|
|
|
ev_int->max_events = 10;
|
|
|
|
ev_int->current_events = 0;
|
|
|
|
INIT_LIST_HEAD(&ev_int->det_events.list);
|
|
|
|
init_waitqueue_head(&ev_int->wait);
|
|
|
|
ev_int->handler.private = ev_int;
|
|
|
|
ev_int->handler.flags = 0;
|
|
|
|
|
|
|
|
ret = cdev_add(&ev_int->handler.chrdev, ev_int->dev.devt, 1);
|
|
|
|
if (ret)
|
|
|
|
goto error_unreg_device;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_unreg_device:
|
|
|
|
device_unregister(&ev_int->dev);
|
|
|
|
error_free_minor:
|
|
|
|
iio_device_free_chrdev_minor(minor);
|
|
|
|
error_device_put:
|
|
|
|
put_device(&ev_int->dev);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
void iio_free_ev_int(struct iio_event_interface *ev_int)
|
|
|
|
{
|
|
|
|
device_unregister(&ev_int->dev);
|
|
|
|
put_device(&ev_int->dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init iio_dev_init(void)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio");
|
|
|
|
if (err < 0)
|
|
|
|
printk(KERN_ERR "%s: failed to allocate char dev region\n",
|
|
|
|
__FILE__);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit iio_dev_exit(void)
|
|
|
|
{
|
|
|
|
if (iio_devt)
|
|
|
|
unregister_chrdev_region(iio_devt, IIO_DEV_MAX);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init iio_init(void)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2010-05-04 15:43:00 +02:00
|
|
|
/* Register sysfs bus */
|
|
|
|
ret = bus_register(&iio_bus_type);
|
2009-08-18 19:06:19 +02:00
|
|
|
if (ret < 0) {
|
|
|
|
printk(KERN_ERR
|
2010-05-04 15:43:00 +02:00
|
|
|
"%s could not register bus type\n",
|
2009-08-18 19:06:19 +02:00
|
|
|
__FILE__);
|
|
|
|
goto error_nothing;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = iio_dev_init();
|
|
|
|
if (ret < 0)
|
2010-05-04 15:43:00 +02:00
|
|
|
goto error_unregister_bus_type;
|
2009-08-18 19:06:19 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
2010-05-04 15:43:00 +02:00
|
|
|
error_unregister_bus_type:
|
|
|
|
bus_unregister(&iio_bus_type);
|
2009-08-18 19:06:19 +02:00
|
|
|
error_nothing:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit iio_exit(void)
|
|
|
|
{
|
|
|
|
iio_dev_exit();
|
2010-05-04 15:43:00 +02:00
|
|
|
bus_unregister(&iio_bus_type);
|
2009-08-18 19:06:19 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int iio_device_register_sysfs(struct iio_dev *dev_info)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(dev_info->dev.parent,
|
|
|
|
"Failed to register sysfs hooks\n");
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
error_ret:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void iio_device_unregister_sysfs(struct iio_dev *dev_info)
|
|
|
|
{
|
|
|
|
sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs);
|
|
|
|
}
|
|
|
|
|
2010-04-27 20:29:54 +02:00
|
|
|
/* Return a negative errno on failure */
|
2010-09-04 18:54:43 +02:00
|
|
|
int iio_get_new_ida_val(struct ida *this_ida)
|
2009-08-18 19:06:19 +02:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
int val;
|
|
|
|
|
2010-09-04 18:54:43 +02:00
|
|
|
ida_again:
|
|
|
|
if (unlikely(ida_pre_get(this_ida, GFP_KERNEL) == 0))
|
2009-08-18 19:06:19 +02:00
|
|
|
return -ENOMEM;
|
|
|
|
|
2010-09-04 18:54:43 +02:00
|
|
|
spin_lock(&iio_ida_lock);
|
|
|
|
ret = ida_get_new(this_ida, &val);
|
|
|
|
spin_unlock(&iio_ida_lock);
|
2009-08-18 19:06:19 +02:00
|
|
|
if (unlikely(ret == -EAGAIN))
|
2010-09-04 18:54:43 +02:00
|
|
|
goto ida_again;
|
2009-08-18 19:06:19 +02:00
|
|
|
else if (unlikely(ret))
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
return val;
|
|
|
|
}
|
2010-09-04 18:54:43 +02:00
|
|
|
EXPORT_SYMBOL(iio_get_new_ida_val);
|
2009-08-18 19:06:19 +02:00
|
|
|
|
2010-09-04 18:54:43 +02:00
|
|
|
void iio_free_ida_val(struct ida *this_ida, int id)
|
2009-08-18 19:06:19 +02:00
|
|
|
{
|
2010-09-04 18:54:43 +02:00
|
|
|
spin_lock(&iio_ida_lock);
|
|
|
|
ida_remove(this_ida, id);
|
|
|
|
spin_unlock(&iio_ida_lock);
|
2009-08-18 19:06:19 +02:00
|
|
|
}
|
2010-09-04 18:54:43 +02:00
|
|
|
EXPORT_SYMBOL(iio_free_ida_val);
|
2009-08-18 19:06:19 +02:00
|
|
|
|
|
|
|
static int iio_device_register_id(struct iio_dev *dev_info,
|
2010-09-04 18:54:43 +02:00
|
|
|
struct ida *this_ida)
|
2009-08-18 19:06:19 +02:00
|
|
|
{
|
2010-09-04 18:54:43 +02:00
|
|
|
dev_info->id = iio_get_new_ida_val(&iio_ida);
|
2009-08-18 19:06:19 +02:00
|
|
|
if (dev_info->id < 0)
|
|
|
|
return dev_info->id;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void iio_device_unregister_id(struct iio_dev *dev_info)
|
|
|
|
{
|
2010-09-04 18:54:43 +02:00
|
|
|
iio_free_ida_val(&iio_ida, dev_info->id);
|
2009-08-18 19:06:19 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
/*p for adding, q for removing */
|
|
|
|
struct attribute **attrp, **attrq;
|
|
|
|
|
|
|
|
if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) {
|
|
|
|
attrp = dev_info->event_conf_attrs[i].attrs;
|
|
|
|
while (*attrp) {
|
|
|
|
ret = sysfs_add_file_to_group(&dev_info->dev.kobj,
|
|
|
|
*attrp,
|
|
|
|
dev_info
|
|
|
|
->event_attrs[i].name);
|
|
|
|
if (ret)
|
|
|
|
goto error_ret;
|
|
|
|
attrp++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_ret:
|
|
|
|
attrq = dev_info->event_conf_attrs[i].attrs;
|
|
|
|
while (attrq != attrp) {
|
|
|
|
sysfs_remove_file_from_group(&dev_info->dev.kobj,
|
|
|
|
*attrq,
|
|
|
|
dev_info->event_attrs[i].name);
|
|
|
|
attrq++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info,
|
|
|
|
int i)
|
|
|
|
{
|
|
|
|
struct attribute **attrq;
|
|
|
|
|
|
|
|
if (dev_info->event_conf_attrs
|
|
|
|
&& dev_info->event_conf_attrs[i].attrs) {
|
|
|
|
attrq = dev_info->event_conf_attrs[i].attrs;
|
|
|
|
while (*attrq) {
|
|
|
|
sysfs_remove_file_from_group(&dev_info->dev.kobj,
|
|
|
|
*attrq,
|
|
|
|
dev_info
|
|
|
|
->event_attrs[i].name);
|
|
|
|
attrq++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int iio_device_register_eventset(struct iio_dev *dev_info)
|
|
|
|
{
|
|
|
|
int ret = 0, i, j;
|
|
|
|
|
|
|
|
if (dev_info->num_interrupt_lines == 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
dev_info->event_interfaces =
|
|
|
|
kzalloc(sizeof(struct iio_event_interface)
|
|
|
|
*dev_info->num_interrupt_lines,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (dev_info->event_interfaces == NULL) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
dev_info->interrupts = kzalloc(sizeof(struct iio_interrupt *)
|
|
|
|
*dev_info->num_interrupt_lines,
|
|
|
|
GFP_KERNEL);
|
|
|
|
if (dev_info->interrupts == NULL) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto error_free_event_interfaces;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < dev_info->num_interrupt_lines; i++) {
|
|
|
|
dev_info->event_interfaces[i].owner = dev_info->driver_module;
|
|
|
|
|
|
|
|
snprintf(dev_info->event_interfaces[i]._name, 20,
|
2010-05-04 15:43:06 +02:00
|
|
|
"%s:event%d",
|
|
|
|
dev_name(&dev_info->dev),
|
2010-06-26 13:54:18 +02:00
|
|
|
i);
|
2009-08-18 19:06:19 +02:00
|
|
|
|
|
|
|
ret = iio_setup_ev_int(&dev_info->event_interfaces[i],
|
|
|
|
(const char *)(dev_info
|
|
|
|
->event_interfaces[i]
|
|
|
|
._name),
|
|
|
|
dev_info->driver_module,
|
|
|
|
&dev_info->dev);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(&dev_info->dev,
|
|
|
|
"Could not get chrdev interface\n");
|
|
|
|
goto error_free_setup_ev_ints;
|
|
|
|
}
|
|
|
|
|
2010-05-04 15:43:01 +02:00
|
|
|
dev_set_drvdata(&dev_info->event_interfaces[i].dev,
|
|
|
|
(void *)dev_info);
|
|
|
|
ret = sysfs_create_group(&dev_info
|
|
|
|
->event_interfaces[i]
|
|
|
|
.dev.kobj,
|
|
|
|
&dev_info->event_attrs[i]);
|
|
|
|
|
2009-08-18 19:06:19 +02:00
|
|
|
if (ret) {
|
|
|
|
dev_err(&dev_info->dev,
|
|
|
|
"Failed to register sysfs for event attrs");
|
|
|
|
goto error_remove_sysfs_interfaces;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < dev_info->num_interrupt_lines; i++) {
|
|
|
|
ret = __iio_add_event_config_attrs(dev_info, i);
|
|
|
|
if (ret)
|
|
|
|
goto error_unregister_config_attrs;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_unregister_config_attrs:
|
|
|
|
for (j = 0; j < i; j++)
|
|
|
|
__iio_remove_event_config_attrs(dev_info, i);
|
|
|
|
i = dev_info->num_interrupt_lines - 1;
|
|
|
|
error_remove_sysfs_interfaces:
|
|
|
|
for (j = 0; j < i; j++)
|
2010-05-04 15:43:01 +02:00
|
|
|
sysfs_remove_group(&dev_info
|
|
|
|
->event_interfaces[j].dev.kobj,
|
2009-08-18 19:06:19 +02:00
|
|
|
&dev_info->event_attrs[j]);
|
|
|
|
error_free_setup_ev_ints:
|
2010-06-26 13:54:18 +02:00
|
|
|
for (j = 0; j < i; j++)
|
2009-08-18 19:06:19 +02:00
|
|
|
iio_free_ev_int(&dev_info->event_interfaces[j]);
|
|
|
|
kfree(dev_info->interrupts);
|
|
|
|
error_free_event_interfaces:
|
|
|
|
kfree(dev_info->event_interfaces);
|
|
|
|
error_ret:
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void iio_device_unregister_eventset(struct iio_dev *dev_info)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (dev_info->num_interrupt_lines == 0)
|
|
|
|
return;
|
|
|
|
for (i = 0; i < dev_info->num_interrupt_lines; i++)
|
2010-05-04 15:43:01 +02:00
|
|
|
sysfs_remove_group(&dev_info
|
|
|
|
->event_interfaces[i].dev.kobj,
|
2009-08-18 19:06:19 +02:00
|
|
|
&dev_info->event_attrs[i]);
|
|
|
|
|
2010-06-26 13:54:18 +02:00
|
|
|
for (i = 0; i < dev_info->num_interrupt_lines; i++)
|
2009-08-18 19:06:19 +02:00
|
|
|
iio_free_ev_int(&dev_info->event_interfaces[i]);
|
|
|
|
kfree(dev_info->interrupts);
|
|
|
|
kfree(dev_info->event_interfaces);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void iio_dev_release(struct device *device)
|
|
|
|
{
|
|
|
|
struct iio_dev *dev = to_iio_dev(device);
|
|
|
|
|
|
|
|
iio_put();
|
|
|
|
kfree(dev);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct device_type iio_dev_type = {
|
|
|
|
.name = "iio_device",
|
|
|
|
.release = iio_dev_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
struct iio_dev *iio_allocate_device(void)
|
|
|
|
{
|
|
|
|
struct iio_dev *dev = kzalloc(sizeof *dev, GFP_KERNEL);
|
|
|
|
|
|
|
|
if (dev) {
|
|
|
|
dev->dev.type = &iio_dev_type;
|
2010-05-04 15:43:00 +02:00
|
|
|
dev->dev.bus = &iio_bus_type;
|
2009-08-18 19:06:19 +02:00
|
|
|
device_initialize(&dev->dev);
|
|
|
|
dev_set_drvdata(&dev->dev, (void *)dev);
|
|
|
|
mutex_init(&dev->mlock);
|
|
|
|
iio_get();
|
|
|
|
}
|
|
|
|
|
|
|
|
return dev;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(iio_allocate_device);
|
|
|
|
|
|
|
|
void iio_free_device(struct iio_dev *dev)
|
|
|
|
{
|
|
|
|
if (dev)
|
|
|
|
iio_put_device(dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(iio_free_device);
|
|
|
|
|
|
|
|
int iio_device_register(struct iio_dev *dev_info)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2010-09-04 18:54:43 +02:00
|
|
|
ret = iio_device_register_id(dev_info, &iio_ida);
|
2009-08-18 19:06:19 +02:00
|
|
|
if (ret) {
|
|
|
|
dev_err(&dev_info->dev, "Failed to get id\n");
|
|
|
|
goto error_ret;
|
|
|
|
}
|
|
|
|
dev_set_name(&dev_info->dev, "device%d", dev_info->id);
|
|
|
|
|
|
|
|
ret = device_add(&dev_info->dev);
|
|
|
|
if (ret)
|
2010-09-04 18:54:43 +02:00
|
|
|
goto error_free_ida;
|
2009-08-18 19:06:19 +02:00
|
|
|
ret = iio_device_register_sysfs(dev_info);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(dev_info->dev.parent,
|
|
|
|
"Failed to register sysfs interfaces\n");
|
|
|
|
goto error_del_device;
|
|
|
|
}
|
|
|
|
ret = iio_device_register_eventset(dev_info);
|
|
|
|
if (ret) {
|
|
|
|
dev_err(dev_info->dev.parent,
|
2010-04-29 19:27:31 +02:00
|
|
|
"Failed to register event set\n");
|
2009-08-18 19:06:19 +02:00
|
|
|
goto error_free_sysfs;
|
|
|
|
}
|
|
|
|
if (dev_info->modes & INDIO_RING_TRIGGERED)
|
|
|
|
iio_device_register_trigger_consumer(dev_info);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
error_free_sysfs:
|
|
|
|
iio_device_unregister_sysfs(dev_info);
|
|
|
|
error_del_device:
|
|
|
|
device_del(&dev_info->dev);
|
2010-09-04 18:54:43 +02:00
|
|
|
error_free_ida:
|
2009-08-18 19:06:19 +02:00
|
|
|
iio_device_unregister_id(dev_info);
|
|
|
|
error_ret:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(iio_device_register);
|
|
|
|
|
|
|
|
void iio_device_unregister(struct iio_dev *dev_info)
|
|
|
|
{
|
|
|
|
if (dev_info->modes & INDIO_RING_TRIGGERED)
|
|
|
|
iio_device_unregister_trigger_consumer(dev_info);
|
|
|
|
iio_device_unregister_eventset(dev_info);
|
|
|
|
iio_device_unregister_sysfs(dev_info);
|
|
|
|
iio_device_unregister_id(dev_info);
|
|
|
|
device_unregister(&dev_info->dev);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(iio_device_unregister);
|
|
|
|
|
|
|
|
void iio_put(void)
|
|
|
|
{
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
}
|
|
|
|
|
|
|
|
void iio_get(void)
|
|
|
|
{
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
}
|
|
|
|
|
|
|
|
subsys_initcall(iio_init);
|
|
|
|
module_exit(iio_exit);
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
|
|
|
|
MODULE_DESCRIPTION("Industrial I/O core");
|
|
|
|
MODULE_LICENSE("GPL");
|