[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / net / smsgiucv.c

/*
 * IUCV special message driver
 *
 * Copyright IBM Corp. 2003, 2009
 *
 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 * 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, 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <net/iucv/iucv.h>
#include <asm/cpcmd.h>
#include <asm/ebcdic.h>
#include "smsgiucv.h"

struct smsg_callback {
	struct list_head list;
	const char *prefix;
	int len;
	void (*callback)(const char *from, char *str);
};

MODULE_AUTHOR
   ("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");

static struct iucv_path *smsg_path;
/* dummy device used as trigger for PM functions */
static struct device *smsg_dev;

static DEFINE_SPINLOCK(smsg_list_lock);
static LIST_HEAD(smsg_list);
static int iucv_path_connected;

static int smsg_path_pending(struct iucv_path *, u8 *, u8 *);
static void smsg_message_pending(struct iucv_path *, struct iucv_message *);

static struct iucv_handler smsg_handler = {
	.path_pending	 = smsg_path_pending,
	.message_pending = smsg_message_pending,
};

static int smsg_path_pending(struct iucv_path *path, u8 *ipvmid, u8 *ipuser)
{
	if (strncmp(ipvmid, "*MSG    ", 8) != 0)
		return -EINVAL;
	/* Path pending from *MSG. */
	return iucv_path_accept(path, &smsg_handler, "SMSGIUCV        ", NULL);
}

static void smsg_message_pending(struct iucv_path *path,
				 struct iucv_message *msg)
{
	struct smsg_callback *cb;
	unsigned char *buffer;
	unsigned char sender[9];
	int rc, i;

	buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA);
	if (!buffer) {
		iucv_message_reject(path, msg);
		return;
	}
	rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL);
	if (rc == 0) {
		buffer[msg->length] = 0;
		EBCASC(buffer, msg->length);
		memcpy(sender, buffer, 8);
		sender[8] = 0;
		/* Remove trailing whitespace from the sender name. */
		for (i = 7; i >= 0; i--) {
			if (sender[i] != ' ' && sender[i] != '\t')
				break;
			sender[i] = 0;
		}
		spin_lock(&smsg_list_lock);
		list_for_each_entry(cb, &smsg_list, list)
			if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) {
				cb->callback(sender, buffer + 8);
				break;
			}
		spin_unlock(&smsg_list_lock);
	}
	kfree(buffer);
}

int smsg_register_callback(const char *prefix,
			   void (*callback)(const char *from, char *str))
{
	struct smsg_callback *cb;

	cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
	if (!cb)
		return -ENOMEM;
	cb->prefix = prefix;
	cb->len = strlen(prefix);
	cb->callback = callback;
	spin_lock_bh(&smsg_list_lock);
	list_add_tail(&cb->list, &smsg_list);
	spin_unlock_bh(&smsg_list_lock);
	return 0;
}

void smsg_unregister_callback(const char *prefix,
			      void (*callback)(const char *from,
					       char *str))
{
	struct smsg_callback *cb, *tmp;

	spin_lock_bh(&smsg_list_lock);
	cb = NULL;
	list_for_each_entry(tmp, &smsg_list, list)
		if (tmp->callback == callback &&
		    strcmp(tmp->prefix, prefix) == 0) {
			cb = tmp;
			list_del(&cb->list);
			break;
		}
	spin_unlock_bh(&smsg_list_lock);
	kfree(cb);
}

static int smsg_pm_freeze(struct device *dev)
{
#ifdef CONFIG_PM_DEBUG
	printk(KERN_WARNING "smsg_pm_freeze\n");
#endif
	if (smsg_path && iucv_path_connected) {
		iucv_path_sever(smsg_path, NULL);
		iucv_path_connected = 0;
	}
	return 0;
}

static int smsg_pm_restore_thaw(struct device *dev)
{
	int rc;

#ifdef CONFIG_PM_DEBUG
	printk(KERN_WARNING "smsg_pm_restore_thaw\n");
#endif
	if (smsg_path && !iucv_path_connected) {
		memset(smsg_path, 0, sizeof(*smsg_path));
		smsg_path->msglim = 255;
		smsg_path->flags = 0;
		rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG    ",
				       NULL, NULL, NULL);
#ifdef CONFIG_PM_DEBUG
		if (rc)
			printk(KERN_ERR
			       "iucv_path_connect returned with rc %i\n", rc);
#endif
		if (!rc)
			iucv_path_connected = 1;
		cpcmd("SET SMSG IUCV", NULL, 0, NULL);
	}
	return 0;
}

static const struct dev_pm_ops smsg_pm_ops = {
	.freeze = smsg_pm_freeze,
	.thaw = smsg_pm_restore_thaw,
	.restore = smsg_pm_restore_thaw,
};

static struct device_driver smsg_driver = {
	.owner = THIS_MODULE,
	.name = SMSGIUCV_DRV_NAME,
	.bus  = &iucv_bus,
	.pm = &smsg_pm_ops,
};

static void __exit smsg_exit(void)
{
	cpcmd("SET SMSG IUCV", NULL, 0, NULL);
	device_unregister(smsg_dev);
	iucv_unregister(&smsg_handler, 1);
	driver_unregister(&smsg_driver);
}

static int __init smsg_init(void)
{
	int rc;

	if (!MACHINE_IS_VM) {
		rc = -EPROTONOSUPPORT;
		goto out;
	}
	rc = driver_register(&smsg_driver);
	if (rc != 0)
		goto out;
	rc = iucv_register(&smsg_handler, 1);
	if (rc)
		goto out_driver;
	smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL);
	if (!smsg_path) {
		rc = -ENOMEM;
		goto out_register;
	}
	rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG    ",
			       NULL, NULL, NULL);
	if (rc)
		goto out_free_path;
	else
		iucv_path_connected = 1;
	smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
	if (!smsg_dev) {
		rc = -ENOMEM;
		goto out_free_path;
	}
	dev_set_name(smsg_dev, "smsg_iucv");
	smsg_dev->bus = &iucv_bus;
	smsg_dev->parent = iucv_root;
	smsg_dev->release = (void (*)(struct device *))kfree;
	smsg_dev->driver = &smsg_driver;
	rc = device_register(smsg_dev);
	if (rc)
		goto out_put;

	cpcmd("SET SMSG IUCV", NULL, 0, NULL);
	return 0;

out_put:
	put_device(smsg_dev);
out_free_path:
	iucv_path_free(smsg_path);
	smsg_path = NULL;
out_register:
	iucv_unregister(&smsg_handler, 1);
out_driver:
	driver_unregister(&smsg_driver);
out:
	return rc;
}

module_init(smsg_init);
module_exit(smsg_exit);
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(smsg_register_callback);
EXPORT_SYMBOL(smsg_unregister_callback);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* IUCV special message driver
	3	*
6a1d96dc MS	4	* Copyright IBM Corp. 2003, 2009
6a1d96dc MS	5	*
1da177e4 LT	6	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2, or (at your option)
	11	* any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/errno.h>
	26	#include <linux/device.h>
5a0e3ad6	27	#include <linux/slab.h>
5da5e658	28	#include <net/iucv/iucv.h>
1da177e4 LT	29	#include <asm/cpcmd.h>
1da177e4 LT	30	#include <asm/ebcdic.h>
5da5e658	31	#include "smsgiucv.h"
1da177e4 LT	32
	33	struct smsg_callback {
	34	struct list_head list;
09003ed9	35	const char *prefix;
1da177e4	36	int len;
09003ed9	37	void (callback)(const char from, char *str);
1da177e4 LT	38	};
	39
	40	MODULE_AUTHOR
	41	("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
	42	MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
	43
5da5e658	44	static struct iucv_path *smsg_path;
6a1d96dc MS	45	/* dummy device used as trigger for PM functions */
6a1d96dc MS	46	static struct device *smsg_dev;
5da5e658	47
1da177e4	48	static DEFINE_SPINLOCK(smsg_list_lock);
c11ca97e	49	static LIST_HEAD(smsg_list);
59b60e97	50	static int iucv_path_connected;
1da177e4	51
91e60eb6	52	static int smsg_path_pending(struct iucv_path , u8 , u8 *);
5da5e658 MS	53	static void smsg_message_pending(struct iucv_path , struct iucv_message );
	54
	55	static struct iucv_handler smsg_handler = {
	56	.path_pending = smsg_path_pending,
	57	.message_pending = smsg_message_pending,
	58	};
	59
91e60eb6	60	static int smsg_path_pending(struct iucv_path path, u8 ipvmid, u8 *ipuser)
1da177e4	61	{
08b01832	62	if (strncmp(ipvmid, "*MSG ", 8) != 0)
5da5e658 MS	63	return -EINVAL;
	64	/* Path pending from MSG. /
	65	return iucv_path_accept(path, &smsg_handler, "SMSGIUCV ", NULL);
1da177e4 LT	66	}
1da177e4 LT	67
5da5e658 MS	68	static void smsg_message_pending(struct iucv_path *path,
5da5e658 MS	69	struct iucv_message *msg)
1da177e4 LT	70	{
1da177e4 LT	71	struct smsg_callback *cb;
5da5e658	72	unsigned char *buffer;
15439d74	73	unsigned char sender[9];
15439d74	74	int rc, i;
1da177e4	75
5da5e658 MS	76	buffer = kmalloc(msg->length + 1, GFP_ATOMIC \| GFP_DMA);
	77	if (!buffer) {
	78	iucv_message_reject(path, msg);
1da177e4 LT	79	return;
1da177e4 LT	80	}
5da5e658	81	rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL);
1da177e4	82	if (rc == 0) {
5da5e658 MS	83	buffer[msg->length] = 0;
	84	EBCASC(buffer, msg->length);
	85	memcpy(sender, buffer, 8);
15439d74 MS	86	sender[8] = 0;
	87	/* Remove trailing whitespace from the sender name. */
	88	for (i = 7; i >= 0; i--) {
	89	if (sender[i] != ' ' && sender[i] != '\t')
	90	break;
	91	sender[i] = 0;
	92	}
1da177e4 LT	93	spin_lock(&smsg_list_lock);
1da177e4 LT	94	list_for_each_entry(cb, &smsg_list, list)
5da5e658 MS	95	if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) {
5da5e658 MS	96	cb->callback(sender, buffer + 8);
1da177e4 LT	97	break;
	98	}
	99	spin_unlock(&smsg_list_lock);
	100	}
5da5e658	101	kfree(buffer);
1da177e4 LT	102	}
1da177e4 LT	103
09003ed9 HB	104	int smsg_register_callback(const char *prefix,
09003ed9 HB	105	void (callback)(const char from, char *str))
1da177e4 LT	106	{
	107	struct smsg_callback *cb;
	108
	109	cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
	110	if (!cb)
	111	return -ENOMEM;
	112	cb->prefix = prefix;
	113	cb->len = strlen(prefix);
	114	cb->callback = callback;
5da5e658	115	spin_lock_bh(&smsg_list_lock);
1da177e4	116	list_add_tail(&cb->list, &smsg_list);
5da5e658	117	spin_unlock_bh(&smsg_list_lock);
1da177e4 LT	118	return 0;
	119	}
	120
09003ed9 HB	121	void smsg_unregister_callback(const char *prefix,
	122	void (callback)(const char from,
	123	char *str))
1da177e4 LT	124	{
	125	struct smsg_callback cb, tmp;
	126
5da5e658	127	spin_lock_bh(&smsg_list_lock);
d2c993d8	128	cb = NULL;
1da177e4 LT	129	list_for_each_entry(tmp, &smsg_list, list)
	130	if (tmp->callback == callback &&
	131	strcmp(tmp->prefix, prefix) == 0) {
	132	cb = tmp;
	133	list_del(&cb->list);
	134	break;
	135	}
5da5e658	136	spin_unlock_bh(&smsg_list_lock);
1da177e4 LT	137	kfree(cb);
	138	}
	139
6a1d96dc MS	140	static int smsg_pm_freeze(struct device *dev)
	141	{
	142	#ifdef CONFIG_PM_DEBUG
	143	printk(KERN_WARNING "smsg_pm_freeze\n");
	144	#endif
59b60e97	145	if (smsg_path && iucv_path_connected) {
6a1d96dc	146	iucv_path_sever(smsg_path, NULL);
59b60e97 UB	147	iucv_path_connected = 0;
59b60e97 UB	148	}
6a1d96dc MS	149	return 0;
	150	}
	151
	152	static int smsg_pm_restore_thaw(struct device *dev)
	153	{
	154	int rc;
	155
	156	#ifdef CONFIG_PM_DEBUG
	157	printk(KERN_WARNING "smsg_pm_restore_thaw\n");
	158	#endif
1c8161a8	159	if (smsg_path && !iucv_path_connected) {
6a1d96dc MS	160	memset(smsg_path, 0, sizeof(*smsg_path));
	161	smsg_path->msglim = 255;
	162	smsg_path->flags = 0;
	163	rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
	164	NULL, NULL, NULL);
8ca45667 MS	165	#ifdef CONFIG_PM_DEBUG
	166	if (rc)
	167	printk(KERN_ERR
	168	"iucv_path_connect returned with rc %i\n", rc);
	169	#endif
59b60e97 UB	170	if (!rc)
59b60e97 UB	171	iucv_path_connected = 1;
8ca45667	172	cpcmd("SET SMSG IUCV", NULL, 0, NULL);
6a1d96dc MS	173	}
	174	return 0;
	175	}
	176
47145210	177	static const struct dev_pm_ops smsg_pm_ops = {
6a1d96dc MS	178	.freeze = smsg_pm_freeze,
	179	.thaw = smsg_pm_restore_thaw,
	180	.restore = smsg_pm_restore_thaw,
	181	};
	182
5da5e658	183	static struct device_driver smsg_driver = {
6a1d96dc	184	.owner = THIS_MODULE,
1ffaa640	185	.name = SMSGIUCV_DRV_NAME,
5da5e658	186	.bus = &iucv_bus,
6a1d96dc	187	.pm = &smsg_pm_ops,
5da5e658 MS	188	};
	189
	190	static void __exit smsg_exit(void)
1da177e4	191	{
5da5e658	192	cpcmd("SET SMSG IUCV", NULL, 0, NULL);
6a1d96dc	193	device_unregister(smsg_dev);
5da5e658 MS	194	iucv_unregister(&smsg_handler, 1);
5da5e658 MS	195	driver_unregister(&smsg_driver);
1da177e4 LT	196	}
1da177e4 LT	197
5da5e658	198	static int __init smsg_init(void)
1da177e4	199	{
1da177e4 LT	200	int rc;
1da177e4 LT	201
0fc3ddd6 CB	202	if (!MACHINE_IS_VM) {
	203	rc = -EPROTONOSUPPORT;
	204	goto out;
	205	}
1da177e4	206	rc = driver_register(&smsg_driver);
5da5e658 MS	207	if (rc != 0)
	208	goto out;
	209	rc = iucv_register(&smsg_handler, 1);
d5ddc809	210	if (rc)
5da5e658	211	goto out_driver;
5da5e658 MS	212	smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL);
	213	if (!smsg_path) {
	214	rc = -ENOMEM;
	215	goto out_register;
1da177e4	216	}
5da5e658 MS	217	rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG ",
5da5e658 MS	218	NULL, NULL, NULL);
d5ddc809	219	if (rc)
6a1d96dc	220	goto out_free_path;
59b60e97 UB	221	else
59b60e97 UB	222	iucv_path_connected = 1;
6a1d96dc MS	223	smsg_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
	224	if (!smsg_dev) {
	225	rc = -ENOMEM;
	226	goto out_free_path;
	227	}
	228	dev_set_name(smsg_dev, "smsg_iucv");
	229	smsg_dev->bus = &iucv_bus;
	230	smsg_dev->parent = iucv_root;
	231	smsg_dev->release = (void ()(struct device ))kfree;
	232	smsg_dev->driver = &smsg_driver;
	233	rc = device_register(smsg_dev);
	234	if (rc)
c6304933	235	goto out_put;
6a1d96dc	236
6b979de3	237	cpcmd("SET SMSG IUCV", NULL, 0, NULL);
1da177e4	238	return 0;
5da5e658	239
c6304933 SO	240	out_put:
c6304933 SO	241	put_device(smsg_dev);
6a1d96dc	242	out_free_path:
5da5e658	243	iucv_path_free(smsg_path);
6a1d96dc	244	smsg_path = NULL;
5da5e658 MS	245	out_register:
	246	iucv_unregister(&smsg_handler, 1);
	247	out_driver:
	248	driver_unregister(&smsg_driver);
	249	out:
	250	return rc;
1da177e4 LT	251	}
	252
	253	module_init(smsg_init);
	254	module_exit(smsg_exit);
	255	MODULE_LICENSE("GPL");
	256
	257	EXPORT_SYMBOL(smsg_register_callback);
	258	EXPORT_SYMBOL(smsg_unregister_callback);