[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / pps / pps.c

/*
 * PPS core file
 *
 *
 * Copyright (C) 2005-2009   Rodolfo Giometti <giometti@linux.it>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/uaccess.h>
#include <linux/idr.h>
#include <linux/mutex.h>
#include <linux/cdev.h>
#include <linux/poll.h>
#include <linux/pps_kernel.h>
#include <linux/slab.h>

#include "kc.h"

/*
 * Local variables
 */

static dev_t pps_devt;
static struct class *pps_class;

static DEFINE_MUTEX(pps_idr_lock);
static DEFINE_IDR(pps_idr);

/*
 * Char device methods
 */

static unsigned int pps_cdev_poll(struct file *file, poll_table *wait)
{
	struct pps_device *pps = file->private_data;

	poll_wait(file, &pps->queue, wait);

	return POLLIN | POLLRDNORM;
}

static int pps_cdev_fasync(int fd, struct file *file, int on)
{
	struct pps_device *pps = file->private_data;
	return fasync_helper(fd, file, on, &pps->async_queue);
}

static long pps_cdev_ioctl(struct file *file,
		unsigned int cmd, unsigned long arg)
{
	struct pps_device *pps = file->private_data;
	struct pps_kparams params;
	void __user *uarg = (void __user *) arg;
	int __user *iuarg = (int __user *) arg;
	int err;

	switch (cmd) {
	case PPS_GETPARAMS:
		dev_dbg(pps->dev, "PPS_GETPARAMS\n");

		spin_lock_irq(&pps->lock);

		/* Get the current parameters */
		params = pps->params;

		spin_unlock_irq(&pps->lock);

		err = copy_to_user(uarg, &params, sizeof(struct pps_kparams));
		if (err)
			return -EFAULT;

		break;

	case PPS_SETPARAMS:
		dev_dbg(pps->dev, "PPS_SETPARAMS\n");

		/* Check the capabilities */
		if (!capable(CAP_SYS_TIME))
			return -EPERM;

		err = copy_from_user(&params, uarg, sizeof(struct pps_kparams));
		if (err)
			return -EFAULT;
		if (!(params.mode & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR))) {
			dev_dbg(pps->dev, "capture mode unspecified (%x)\n",
								params.mode);
			return -EINVAL;
		}

		/* Check for supported capabilities */
		if ((params.mode & ~pps->info.mode) != 0) {
			dev_dbg(pps->dev, "unsupported capabilities (%x)\n",
								params.mode);
			return -EINVAL;
		}

		spin_lock_irq(&pps->lock);

		/* Save the new parameters */
		pps->params = params;

		/* Restore the read only parameters */
		if ((params.mode & (PPS_TSFMT_TSPEC | PPS_TSFMT_NTPFP)) == 0) {
			/* section 3.3 of RFC 2783 interpreted */
			dev_dbg(pps->dev, "time format unspecified (%x)\n",
								params.mode);
			pps->params.mode |= PPS_TSFMT_TSPEC;
		}
		if (pps->info.mode & PPS_CANWAIT)
			pps->params.mode |= PPS_CANWAIT;
		pps->params.api_version = PPS_API_VERS;

		spin_unlock_irq(&pps->lock);

		break;

	case PPS_GETCAP:
		dev_dbg(pps->dev, "PPS_GETCAP\n");

		err = put_user(pps->info.mode, iuarg);
		if (err)
			return -EFAULT;

		break;

	case PPS_FETCH: {
		struct pps_fdata fdata;
		unsigned int ev;

		dev_dbg(pps->dev, "PPS_FETCH\n");

		err = copy_from_user(&fdata, uarg, sizeof(struct pps_fdata));
		if (err)
			return -EFAULT;

		ev = pps->last_ev;

		/* Manage the timeout */
		if (fdata.timeout.flags & PPS_TIME_INVALID)
			err = wait_event_interruptible(pps->queue,
					ev != pps->last_ev);
		else {
			unsigned long ticks;

			dev_dbg(pps->dev, "timeout %lld.%09d\n",
					(long long) fdata.timeout.sec,
					fdata.timeout.nsec);
			ticks = fdata.timeout.sec * HZ;
			ticks += fdata.timeout.nsec / (NSEC_PER_SEC / HZ);

			if (ticks != 0) {
				err = wait_event_interruptible_timeout(
						pps->queue,
						ev != pps->last_ev,
						ticks);
				if (err == 0)
					return -ETIMEDOUT;
			}
		}

		/* Check for pending signals */
		if (err == -ERESTARTSYS) {
			dev_dbg(pps->dev, "pending signal caught\n");
			return -EINTR;
		}

		/* Return the fetched timestamp */
		spin_lock_irq(&pps->lock);

		fdata.info.assert_sequence = pps->assert_sequence;
		fdata.info.clear_sequence = pps->clear_sequence;
		fdata.info.assert_tu = pps->assert_tu;
		fdata.info.clear_tu = pps->clear_tu;
		fdata.info.current_mode = pps->current_mode;

		spin_unlock_irq(&pps->lock);

		err = copy_to_user(uarg, &fdata, sizeof(struct pps_fdata));
		if (err)
			return -EFAULT;

		break;
	}
	case PPS_KC_BIND: {
		struct pps_bind_args bind_args;

		dev_dbg(pps->dev, "PPS_KC_BIND\n");

		/* Check the capabilities */
		if (!capable(CAP_SYS_TIME))
			return -EPERM;

		if (copy_from_user(&bind_args, uarg,
					sizeof(struct pps_bind_args)))
			return -EFAULT;

		/* Check for supported capabilities */
		if ((bind_args.edge & ~pps->info.mode) != 0) {
			dev_err(pps->dev, "unsupported capabilities (%x)\n",
					bind_args.edge);
			return -EINVAL;
		}

		/* Validate parameters roughly */
		if (bind_args.tsformat != PPS_TSFMT_TSPEC ||
				(bind_args.edge & ~PPS_CAPTUREBOTH) != 0 ||
				bind_args.consumer != PPS_KC_HARDPPS) {
			dev_err(pps->dev, "invalid kernel consumer bind"
					" parameters (%x)\n", bind_args.edge);
			return -EINVAL;
		}

		err = pps_kc_bind(pps, &bind_args);
		if (err < 0)
			return err;

		break;
	}
	default:
		return -ENOTTY;
	}

	return 0;
}

static int pps_cdev_open(struct inode *inode, struct file *file)
{
	struct pps_device *pps = container_of(inode->i_cdev,
						struct pps_device, cdev);
	file->private_data = pps;

	return 0;
}

static int pps_cdev_release(struct inode *inode, struct file *file)
{
	return 0;
}

/*
 * Char device stuff
 */

static const struct file_operations pps_cdev_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.poll		= pps_cdev_poll,
	.fasync		= pps_cdev_fasync,
	.unlocked_ioctl	= pps_cdev_ioctl,
	.open		= pps_cdev_open,
	.release	= pps_cdev_release,
};

static void pps_device_destruct(struct device *dev)
{
	struct pps_device *pps = dev_get_drvdata(dev);

	/* release id here to protect others from using it while it's
	 * still in use */
	mutex_lock(&pps_idr_lock);
	idr_remove(&pps_idr, pps->id);
	mutex_unlock(&pps_idr_lock);

	kfree(dev);
	kfree(pps);
}

int pps_register_cdev(struct pps_device *pps)
{
	int err;
	dev_t devt;

	mutex_lock(&pps_idr_lock);
	/* Get new ID for the new PPS source */
	if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0) {
		mutex_unlock(&pps_idr_lock);
		return -ENOMEM;
	}

	/* Now really allocate the PPS source.
	 * After idr_get_new() calling the new source will be freely available
	 * into the kernel.
	 */
	err = idr_get_new(&pps_idr, pps, &pps->id);
	mutex_unlock(&pps_idr_lock);

	if (err < 0)
		return err;

	pps->id &= MAX_ID_MASK;
	if (pps->id >= PPS_MAX_SOURCES) {
		pr_err("%s: too many PPS sources in the system\n",
					pps->info.name);
		err = -EBUSY;
		goto free_idr;
	}

	devt = MKDEV(MAJOR(pps_devt), pps->id);

	cdev_init(&pps->cdev, &pps_cdev_fops);
	pps->cdev.owner = pps->info.owner;

	err = cdev_add(&pps->cdev, devt, 1);
	if (err) {
		pr_err("%s: failed to add char device %d:%d\n",
				pps->info.name, MAJOR(pps_devt), pps->id);
		goto free_idr;
	}
	pps->dev = device_create(pps_class, pps->info.dev, devt, pps,
							"pps%d", pps->id);
	if (IS_ERR(pps->dev))
		goto del_cdev;

	pps->dev->release = pps_device_destruct;

	pr_debug("source %s got cdev (%d:%d)\n", pps->info.name,
			MAJOR(pps_devt), pps->id);

	return 0;

del_cdev:
	cdev_del(&pps->cdev);

free_idr:
	mutex_lock(&pps_idr_lock);
	idr_remove(&pps_idr, pps->id);
	mutex_unlock(&pps_idr_lock);

	return err;
}

void pps_unregister_cdev(struct pps_device *pps)
{
	device_destroy(pps_class, pps->dev->devt);
	cdev_del(&pps->cdev);
}

/*
 * Module stuff
 */

static void __exit pps_exit(void)
{
	class_destroy(pps_class);
	unregister_chrdev_region(pps_devt, PPS_MAX_SOURCES);
}

static int __init pps_init(void)
{
	int err;

	pps_class = class_create(THIS_MODULE, "pps");
	if (IS_ERR(pps_class)) {
		pr_err("failed to allocate class\n");
		return PTR_ERR(pps_class);
	}
	pps_class->dev_attrs = pps_attrs;

	err = alloc_chrdev_region(&pps_devt, 0, PPS_MAX_SOURCES, "pps");
	if (err < 0) {
		pr_err("failed to allocate char device region\n");
		goto remove_class;
	}

	pr_info("LinuxPPS API ver. %d registered\n", PPS_API_VERS);
	pr_info("Software ver. %s - Copyright 2005-2007 Rodolfo Giometti "
		"<giometti@linux.it>\n", PPS_VERSION);

	return 0;

remove_class:
	class_destroy(pps_class);

	return err;
}

subsys_initcall(pps_init);
module_exit(pps_exit);

MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("LinuxPPS support (RFC 2783) - ver. " PPS_VERSION);
MODULE_LICENSE("GPL");
Commit	Line	Data
eae9d2ba RG	1	/*
	2	* PPS core file
	3	*
	4	*
	5	* Copyright (C) 2005-2009 Rodolfo Giometti <giometti@linux.it>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
7f7cce74	22	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
eae9d2ba RG	23
	24	#include <linux/kernel.h>
	25	#include <linux/module.h>
	26	#include <linux/init.h>
	27	#include <linux/sched.h>
	28	#include <linux/uaccess.h>
	29	#include <linux/idr.h>
2a5cd6e2	30	#include <linux/mutex.h>
eae9d2ba RG	31	#include <linux/cdev.h>
	32	#include <linux/poll.h>
	33	#include <linux/pps_kernel.h>
083e5866	34	#include <linux/slab.h>
eae9d2ba	35
717c0336 AG	36	#include "kc.h"
717c0336 AG	37
eae9d2ba RG	38	/*
	39	* Local variables
	40	*/
	41
	42	static dev_t pps_devt;
	43	static struct class *pps_class;
	44
2a5cd6e2	45	static DEFINE_MUTEX(pps_idr_lock);
083e5866 AG	46	static DEFINE_IDR(pps_idr);
083e5866 AG	47
eae9d2ba RG	48	/*
	49	* Char device methods
	50	*/
	51
	52	static unsigned int pps_cdev_poll(struct file file, poll_table wait)
	53	{
	54	struct pps_device *pps = file->private_data;
	55
	56	poll_wait(file, &pps->queue, wait);
	57
	58	return POLLIN \| POLLRDNORM;
	59	}
	60
	61	static int pps_cdev_fasync(int fd, struct file *file, int on)
	62	{
	63	struct pps_device *pps = file->private_data;
	64	return fasync_helper(fd, file, on, &pps->async_queue);
	65	}
	66
	67	static long pps_cdev_ioctl(struct file *file,
	68	unsigned int cmd, unsigned long arg)
	69	{
	70	struct pps_device *pps = file->private_data;
	71	struct pps_kparams params;
eae9d2ba RG	72	void __user uarg = (void __user ) arg;
	73	int __user iuarg = (int __user ) arg;
	74	int err;
	75
	76	switch (cmd) {
	77	case PPS_GETPARAMS:
7f7cce74	78	dev_dbg(pps->dev, "PPS_GETPARAMS\n");
eae9d2ba	79
cbf83cc5 RG	80	spin_lock_irq(&pps->lock);
	81
	82	/* Get the current parameters */
	83	params = pps->params;
	84
	85	spin_unlock_irq(&pps->lock);
	86
	87	err = copy_to_user(uarg, &params, sizeof(struct pps_kparams));
eae9d2ba RG	88	if (err)
	89	return -EFAULT;
	90
	91	break;
	92
	93	case PPS_SETPARAMS:
7f7cce74	94	dev_dbg(pps->dev, "PPS_SETPARAMS\n");
eae9d2ba RG	95
	96	/* Check the capabilities */
	97	if (!capable(CAP_SYS_TIME))
	98	return -EPERM;
	99
	100	err = copy_from_user(&params, uarg, sizeof(struct pps_kparams));
	101	if (err)
	102	return -EFAULT;
	103	if (!(params.mode & (PPS_CAPTUREASSERT \| PPS_CAPTURECLEAR))) {
7f7cce74	104	dev_dbg(pps->dev, "capture mode unspecified (%x)\n",
eae9d2ba RG	105	params.mode);
	106	return -EINVAL;
	107	}
	108
	109	/* Check for supported capabilities */
	110	if ((params.mode & ~pps->info.mode) != 0) {
7f7cce74	111	dev_dbg(pps->dev, "unsupported capabilities (%x)\n",
eae9d2ba RG	112	params.mode);
	113	return -EINVAL;
	114	}
	115
	116	spin_lock_irq(&pps->lock);
	117
	118	/* Save the new parameters */
	119	pps->params = params;
	120
	121	/* Restore the read only parameters */
	122	if ((params.mode & (PPS_TSFMT_TSPEC \| PPS_TSFMT_NTPFP)) == 0) {
	123	/* section 3.3 of RFC 2783 interpreted */
7f7cce74	124	dev_dbg(pps->dev, "time format unspecified (%x)\n",
eae9d2ba RG	125	params.mode);
	126	pps->params.mode \|= PPS_TSFMT_TSPEC;
	127	}
	128	if (pps->info.mode & PPS_CANWAIT)
	129	pps->params.mode \|= PPS_CANWAIT;
	130	pps->params.api_version = PPS_API_VERS;
	131
	132	spin_unlock_irq(&pps->lock);
	133
	134	break;
	135
	136	case PPS_GETCAP:
7f7cce74	137	dev_dbg(pps->dev, "PPS_GETCAP\n");
eae9d2ba RG	138
	139	err = put_user(pps->info.mode, iuarg);
	140	if (err)
	141	return -EFAULT;
	142
	143	break;
	144
86d921f9 AG	145	case PPS_FETCH: {
86d921f9 AG	146	struct pps_fdata fdata;
3003d55b	147	unsigned int ev;
86d921f9	148
7f7cce74	149	dev_dbg(pps->dev, "PPS_FETCH\n");
eae9d2ba RG	150
	151	err = copy_from_user(&fdata, uarg, sizeof(struct pps_fdata));
	152	if (err)
	153	return -EFAULT;
	154
3003d55b	155	ev = pps->last_ev;
eae9d2ba RG	156
	157	/* Manage the timeout */
	158	if (fdata.timeout.flags & PPS_TIME_INVALID)
3003d55b AG	159	err = wait_event_interruptible(pps->queue,
3003d55b AG	160	ev != pps->last_ev);
eae9d2ba	161	else {
86d921f9 AG	162	unsigned long ticks;
86d921f9 AG	163
7f7cce74	164	dev_dbg(pps->dev, "timeout %lld.%09d\n",
eae9d2ba RG	165	(long long) fdata.timeout.sec,
	166	fdata.timeout.nsec);
	167	ticks = fdata.timeout.sec * HZ;
	168	ticks += fdata.timeout.nsec / (NSEC_PER_SEC / HZ);
	169
	170	if (ticks != 0) {
	171	err = wait_event_interruptible_timeout(
3003d55b AG	172	pps->queue,
	173	ev != pps->last_ev,
	174	ticks);
eae9d2ba RG	175	if (err == 0)
	176	return -ETIMEDOUT;
	177	}
	178	}
	179
	180	/* Check for pending signals */
	181	if (err == -ERESTARTSYS) {
7f7cce74	182	dev_dbg(pps->dev, "pending signal caught\n");
eae9d2ba RG	183	return -EINTR;
	184	}
	185
	186	/* Return the fetched timestamp */
	187	spin_lock_irq(&pps->lock);
	188
	189	fdata.info.assert_sequence = pps->assert_sequence;
	190	fdata.info.clear_sequence = pps->clear_sequence;
	191	fdata.info.assert_tu = pps->assert_tu;
	192	fdata.info.clear_tu = pps->clear_tu;
	193	fdata.info.current_mode = pps->current_mode;
	194
	195	spin_unlock_irq(&pps->lock);
	196
	197	err = copy_to_user(uarg, &fdata, sizeof(struct pps_fdata));
	198	if (err)
	199	return -EFAULT;
	200
	201	break;
86d921f9	202	}
717c0336 AG	203	case PPS_KC_BIND: {
	204	struct pps_bind_args bind_args;
	205
	206	dev_dbg(pps->dev, "PPS_KC_BIND\n");
	207
	208	/* Check the capabilities */
	209	if (!capable(CAP_SYS_TIME))
	210	return -EPERM;
	211
	212	if (copy_from_user(&bind_args, uarg,
	213	sizeof(struct pps_bind_args)))
	214	return -EFAULT;
	215
	216	/* Check for supported capabilities */
	217	if ((bind_args.edge & ~pps->info.mode) != 0) {
	218	dev_err(pps->dev, "unsupported capabilities (%x)\n",
	219	bind_args.edge);
	220	return -EINVAL;
	221	}
	222
	223	/* Validate parameters roughly */
	224	if (bind_args.tsformat != PPS_TSFMT_TSPEC \|\|
	225	(bind_args.edge & ~PPS_CAPTUREBOTH) != 0 \|\|
	226	bind_args.consumer != PPS_KC_HARDPPS) {
	227	dev_err(pps->dev, "invalid kernel consumer bind"
	228	" parameters (%x)\n", bind_args.edge);
	229	return -EINVAL;
	230	}
	231
	232	err = pps_kc_bind(pps, &bind_args);
	233	if (err < 0)
	234	return err;
	235
	236	break;
	237	}
eae9d2ba RG	238	default:
eae9d2ba RG	239	return -ENOTTY;
eae9d2ba RG	240	}
	241
	242	return 0;
	243	}
	244
	245	static int pps_cdev_open(struct inode inode, struct file file)
	246	{
	247	struct pps_device *pps = container_of(inode->i_cdev,
	248	struct pps_device, cdev);
eae9d2ba RG	249	file->private_data = pps;
	250
	251	return 0;
	252	}
	253
	254	static int pps_cdev_release(struct inode inode, struct file file)
	255	{
eae9d2ba RG	256	return 0;
	257	}
	258
	259	/*
	260	* Char device stuff
	261	*/
	262
	263	static const struct file_operations pps_cdev_fops = {
	264	.owner = THIS_MODULE,
	265	.llseek = no_llseek,
	266	.poll = pps_cdev_poll,
	267	.fasync = pps_cdev_fasync,
	268	.unlocked_ioctl = pps_cdev_ioctl,
	269	.open = pps_cdev_open,
	270	.release = pps_cdev_release,
	271	};
	272
083e5866 AG	273	static void pps_device_destruct(struct device *dev)
	274	{
	275	struct pps_device *pps = dev_get_drvdata(dev);
	276
	277	/* release id here to protect others from using it while it's
	278	* still in use */
2a5cd6e2	279	mutex_lock(&pps_idr_lock);
083e5866	280	idr_remove(&pps_idr, pps->id);
2a5cd6e2	281	mutex_unlock(&pps_idr_lock);
083e5866 AG	282
	283	kfree(dev);
	284	kfree(pps);
	285	}
	286
eae9d2ba RG	287	int pps_register_cdev(struct pps_device *pps)
	288	{
	289	int err;
5e196d34 AG	290	dev_t devt;
5e196d34 AG	291
2a5cd6e2	292	mutex_lock(&pps_idr_lock);
083e5866	293	/* Get new ID for the new PPS source */
2a5cd6e2 AG	294	if (idr_pre_get(&pps_idr, GFP_KERNEL) == 0) {
2a5cd6e2 AG	295	mutex_unlock(&pps_idr_lock);
083e5866	296	return -ENOMEM;
2a5cd6e2	297	}
083e5866 AG	298
	299	/* Now really allocate the PPS source.
	300	* After idr_get_new() calling the new source will be freely available
	301	* into the kernel.
	302	*/
083e5866	303	err = idr_get_new(&pps_idr, pps, &pps->id);
2a5cd6e2	304	mutex_unlock(&pps_idr_lock);
083e5866 AG	305
	306	if (err < 0)
	307	return err;
	308
	309	pps->id &= MAX_ID_MASK;
	310	if (pps->id >= PPS_MAX_SOURCES) {
	311	pr_err("%s: too many PPS sources in the system\n",
	312	pps->info.name);
	313	err = -EBUSY;
	314	goto free_idr;
	315	}
	316
5e196d34	317	devt = MKDEV(MAJOR(pps_devt), pps->id);
eae9d2ba	318
eae9d2ba RG	319	cdev_init(&pps->cdev, &pps_cdev_fops);
	320	pps->cdev.owner = pps->info.owner;
	321
5e196d34	322	err = cdev_add(&pps->cdev, devt, 1);
eae9d2ba	323	if (err) {
7f7cce74	324	pr_err("%s: failed to add char device %d:%d\n",
eae9d2ba	325	pps->info.name, MAJOR(pps_devt), pps->id);
083e5866	326	goto free_idr;
eae9d2ba	327	}
5e196d34	328	pps->dev = device_create(pps_class, pps->info.dev, devt, pps,
eae9d2ba	329	"pps%d", pps->id);
054b2b13	330	if (IS_ERR(pps->dev))
eae9d2ba	331	goto del_cdev;
eae9d2ba	332
083e5866 AG	333	pps->dev->release = pps_device_destruct;
083e5866 AG	334
eae9d2ba RG	335	pr_debug("source %s got cdev (%d:%d)\n", pps->info.name,
	336	MAJOR(pps_devt), pps->id);
	337
	338	return 0;
	339
	340	del_cdev:
	341	cdev_del(&pps->cdev);
	342
083e5866	343	free_idr:
2a5cd6e2	344	mutex_lock(&pps_idr_lock);
083e5866	345	idr_remove(&pps_idr, pps->id);
2a5cd6e2	346	mutex_unlock(&pps_idr_lock);
083e5866	347
eae9d2ba RG	348	return err;
	349	}
	350
	351	void pps_unregister_cdev(struct pps_device *pps)
	352	{
5e196d34	353	device_destroy(pps_class, pps->dev->devt);
eae9d2ba RG	354	cdev_del(&pps->cdev);
	355	}
	356
	357	/*
	358	* Module stuff
	359	*/
	360
	361	static void __exit pps_exit(void)
	362	{
	363	class_destroy(pps_class);
	364	unregister_chrdev_region(pps_devt, PPS_MAX_SOURCES);
	365	}
	366
	367	static int __init pps_init(void)
	368	{
	369	int err;
	370
	371	pps_class = class_create(THIS_MODULE, "pps");
7ad12566	372	if (IS_ERR(pps_class)) {
7f7cce74	373	pr_err("failed to allocate class\n");
7ad12566	374	return PTR_ERR(pps_class);
eae9d2ba RG	375	}
	376	pps_class->dev_attrs = pps_attrs;
	377
	378	err = alloc_chrdev_region(&pps_devt, 0, PPS_MAX_SOURCES, "pps");
	379	if (err < 0) {
7f7cce74	380	pr_err("failed to allocate char device region\n");
eae9d2ba RG	381	goto remove_class;
	382	}
	383
	384	pr_info("LinuxPPS API ver. %d registered\n", PPS_API_VERS);
	385	pr_info("Software ver. %s - Copyright 2005-2007 Rodolfo Giometti "
	386	"<giometti@linux.it>\n", PPS_VERSION);
	387
	388	return 0;
	389
	390	remove_class:
	391	class_destroy(pps_class);
	392
	393	return err;
	394	}
	395
	396	subsys_initcall(pps_init);
	397	module_exit(pps_exit);
	398
	399	MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
	400	MODULE_DESCRIPTION("LinuxPPS support (RFC 2783) - ver. " PPS_VERSION);
	401	MODULE_LICENSE("GPL");