[mirror_ubuntu-zesty-kernel.git] / drivers / mailbox / mailbox-test.c

/*
 * Copyright (C) 2015 ST Microelectronics
 *
 * Author: Lee Jones <lee.jones@linaro.org>
 *
 * 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.
 */

#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#define MBOX_MAX_SIG_LEN	8
#define MBOX_MAX_MSG_LEN	128
#define MBOX_BYTES_PER_LINE	16
#define MBOX_HEXDUMP_LINE_LEN	((MBOX_BYTES_PER_LINE * 4) + 2)
#define MBOX_HEXDUMP_MAX_LEN	(MBOX_HEXDUMP_LINE_LEN *		\
				 (MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))

static struct dentry *root_debugfs_dir;

struct mbox_test_device {
	struct device		*dev;
	void __iomem		*mmio;
	struct mbox_chan	*tx_channel;
	struct mbox_chan	*rx_channel;
	char			*rx_buffer;
	char			*signal;
	char			*message;
	spinlock_t		lock;
};

static ssize_t mbox_test_signal_write(struct file *filp,
				       const char __user *userbuf,
				       size_t count, loff_t *ppos)
{
	struct mbox_test_device *tdev = filp->private_data;
	int ret;

	if (!tdev->tx_channel) {
		dev_err(tdev->dev, "Channel cannot do Tx\n");
		return -EINVAL;
	}

	if (count > MBOX_MAX_SIG_LEN) {
		dev_err(tdev->dev,
			"Signal length %zd greater than max allowed %d\n",
			count, MBOX_MAX_SIG_LEN);
		return -EINVAL;
	}

	tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
	if (!tdev->signal)
		return -ENOMEM;

	ret = copy_from_user(tdev->signal, userbuf, count);
	if (ret) {
		kfree(tdev->signal);
		return -EFAULT;
	}

	return ret < 0 ? ret : count;
}

static const struct file_operations mbox_test_signal_ops = {
	.write	= mbox_test_signal_write,
	.open	= simple_open,
	.llseek	= generic_file_llseek,
};

static ssize_t mbox_test_message_write(struct file *filp,
				       const char __user *userbuf,
				       size_t count, loff_t *ppos)
{
	struct mbox_test_device *tdev = filp->private_data;
	void *data;
	int ret;

	if (!tdev->tx_channel) {
		dev_err(tdev->dev, "Channel cannot do Tx\n");
		return -EINVAL;
	}

	if (count > MBOX_MAX_MSG_LEN) {
		dev_err(tdev->dev,
			"Message length %zd greater than max allowed %d\n",
			count, MBOX_MAX_MSG_LEN);
		return -EINVAL;
	}

	tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
	if (!tdev->message)
		return -ENOMEM;

	ret = copy_from_user(tdev->message, userbuf, count);
	if (ret) {
		ret = -EFAULT;
		goto out;
	}

	/*
	 * A separate signal is only of use if there is
	 * MMIO to subsequently pass the message through
	 */
	if (tdev->mmio && tdev->signal) {
		print_hex_dump_bytes("Client: Sending: Signal: ", DUMP_PREFIX_ADDRESS,
				     tdev->signal, MBOX_MAX_SIG_LEN);

		data = tdev->signal;
	} else
		data = tdev->message;

	print_hex_dump_bytes("Client: Sending: Message: ", DUMP_PREFIX_ADDRESS,
			     tdev->message, MBOX_MAX_MSG_LEN);

	ret = mbox_send_message(tdev->tx_channel, data);
	if (ret < 0)
		dev_err(tdev->dev, "Failed to send message via mailbox\n");

out:
	kfree(tdev->signal);
	kfree(tdev->message);

	return ret < 0 ? ret : count;
}

static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
				      size_t count, loff_t *ppos)
{
	struct mbox_test_device *tdev = filp->private_data;
	unsigned long flags;
	char *touser, *ptr;
	int l = 0;
	int ret;

	touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
	if (!touser)
		return -ENOMEM;

	if (!tdev->rx_channel) {
		ret = snprintf(touser, 20, "<NO RX CAPABILITY>\n");
		ret = simple_read_from_buffer(userbuf, count, ppos,
					      touser, ret);
		goto out;
	}

	if (tdev->rx_buffer[0] == '\0') {
		ret = snprintf(touser, 9, "<EMPTY>\n");
		ret = simple_read_from_buffer(userbuf, count, ppos,
					      touser, ret);
		goto out;
	}

	spin_lock_irqsave(&tdev->lock, flags);

	ptr = tdev->rx_buffer;
	while (l < MBOX_HEXDUMP_MAX_LEN) {
		hex_dump_to_buffer(ptr,
				   MBOX_BYTES_PER_LINE,
				   MBOX_BYTES_PER_LINE, 1, touser + l,
				   MBOX_HEXDUMP_LINE_LEN, true);

		ptr += MBOX_BYTES_PER_LINE;
		l += MBOX_HEXDUMP_LINE_LEN;
		*(touser + (l - 1)) = '\n';
	}
	*(touser + l) = '\0';

	memset(tdev->rx_buffer, 0, MBOX_MAX_MSG_LEN);

	spin_unlock_irqrestore(&tdev->lock, flags);

	ret = simple_read_from_buffer(userbuf, count, ppos, touser, MBOX_HEXDUMP_MAX_LEN);
out:
	kfree(touser);
	return ret;
}

static const struct file_operations mbox_test_message_ops = {
	.write	= mbox_test_message_write,
	.read	= mbox_test_message_read,
	.open	= simple_open,
	.llseek	= generic_file_llseek,
};

static int mbox_test_add_debugfs(struct platform_device *pdev,
				 struct mbox_test_device *tdev)
{
	if (!debugfs_initialized())
		return 0;

	root_debugfs_dir = debugfs_create_dir("mailbox", NULL);
	if (!root_debugfs_dir) {
		dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
		return -EINVAL;
	}

	debugfs_create_file("message", 0600, root_debugfs_dir,
			    tdev, &mbox_test_message_ops);

	debugfs_create_file("signal", 0200, root_debugfs_dir,
			    tdev, &mbox_test_signal_ops);

	return 0;
}

static void mbox_test_receive_message(struct mbox_client *client, void *message)
{
	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
	unsigned long flags;

	spin_lock_irqsave(&tdev->lock, flags);
	if (tdev->mmio) {
		memcpy_fromio(tdev->rx_buffer, tdev->mmio, MBOX_MAX_MSG_LEN);
		print_hex_dump_bytes("Client: Received [MMIO]: ", DUMP_PREFIX_ADDRESS,
				     tdev->rx_buffer, MBOX_MAX_MSG_LEN);
	} else if (message) {
		print_hex_dump_bytes("Client: Received [API]: ", DUMP_PREFIX_ADDRESS,
				     message, MBOX_MAX_MSG_LEN);
		memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
	}
	spin_unlock_irqrestore(&tdev->lock, flags);
}

static void mbox_test_prepare_message(struct mbox_client *client, void *message)
{
	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);

	if (tdev->mmio) {
		if (tdev->signal)
			memcpy_toio(tdev->mmio, tdev->message, MBOX_MAX_MSG_LEN);
		else
			memcpy_toio(tdev->mmio, message, MBOX_MAX_MSG_LEN);
	}
}

static void mbox_test_message_sent(struct mbox_client *client,
				   void *message, int r)
{
	if (r)
		dev_warn(client->dev,
			 "Client: Message could not be sent: %d\n", r);
	else
		dev_info(client->dev,
			 "Client: Message sent\n");
}

static struct mbox_chan *
mbox_test_request_channel(struct platform_device *pdev, const char *name)
{
	struct mbox_client *client;
	struct mbox_chan *channel;

	client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
	if (!client)
		return ERR_PTR(-ENOMEM);

	client->dev		= &pdev->dev;
	client->rx_callback	= mbox_test_receive_message;
	client->tx_prepare	= mbox_test_prepare_message;
	client->tx_done		= mbox_test_message_sent;
	client->tx_block	= true;
	client->knows_txdone	= false;
	client->tx_tout		= 500;

	channel = mbox_request_channel_byname(client, name);
	if (IS_ERR(channel)) {
		dev_warn(&pdev->dev, "Failed to request %s channel\n", name);
		return NULL;
	}

	return channel;
}

static int mbox_test_probe(struct platform_device *pdev)
{
	struct mbox_test_device *tdev;
	struct resource *res;
	int ret;

	tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
	if (!tdev)
		return -ENOMEM;

	/* It's okay for MMIO to be NULL */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	tdev->mmio = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(tdev->mmio))
		tdev->mmio = NULL;

	tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
	tdev->rx_channel = mbox_test_request_channel(pdev, "rx");

	if (!tdev->tx_channel && !tdev->rx_channel)
		return -EPROBE_DEFER;

	tdev->dev = &pdev->dev;
	platform_set_drvdata(pdev, tdev);

	spin_lock_init(&tdev->lock);

	if (tdev->rx_channel) {
		tdev->rx_buffer = devm_kzalloc(&pdev->dev,
					       MBOX_MAX_MSG_LEN, GFP_KERNEL);
		if (!tdev->rx_buffer)
			return -ENOMEM;
	}

	ret = mbox_test_add_debugfs(pdev, tdev);
	if (ret)
		return ret;

	dev_info(&pdev->dev, "Successfully registered\n");

	return 0;
}

static int mbox_test_remove(struct platform_device *pdev)
{
	struct mbox_test_device *tdev = platform_get_drvdata(pdev);

	debugfs_remove_recursive(root_debugfs_dir);

	if (tdev->tx_channel)
		mbox_free_channel(tdev->tx_channel);
	if (tdev->rx_channel)
		mbox_free_channel(tdev->rx_channel);

	return 0;
}

static const struct of_device_id mbox_test_match[] = {
	{ .compatible = "mailbox-test" },
	{},
};

static struct platform_driver mbox_test_driver = {
	.driver = {
		.name = "mailbox_test",
		.of_match_table = mbox_test_match,
	},
	.probe  = mbox_test_probe,
	.remove = mbox_test_remove,
};
module_platform_driver(mbox_test_driver);

MODULE_DESCRIPTION("Generic Mailbox Testing Facility");
MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
8ea4484d LJ	1	/*
	2	* Copyright (C) 2015 ST Microelectronics
	3	*
	4	* Author: Lee Jones <lee.jones@linaro.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/debugfs.h>
	13	#include <linux/err.h>
a133f8b6	14	#include <linux/io.h>
8ea4484d LJ	15	#include <linux/kernel.h>
	16	#include <linux/mailbox_client.h>
	17	#include <linux/module.h>
	18	#include <linux/of.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/slab.h>
	21	#include <linux/uaccess.h>
	22
	23	#define MBOX_MAX_SIG_LEN 8
	24	#define MBOX_MAX_MSG_LEN 128
	25	#define MBOX_BYTES_PER_LINE 16
6c03663f	26	#define MBOX_HEXDUMP_LINE_LEN ((MBOX_BYTES_PER_LINE * 4) + 2)
8ea4484d LJ	27	#define MBOX_HEXDUMP_MAX_LEN (MBOX_HEXDUMP_LINE_LEN * \
	28	(MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))
	29
	30	static struct dentry *root_debugfs_dir;
	31
	32	struct mbox_test_device {
	33	struct device *dev;
a133f8b6	34	void __iomem *mmio;
8ea4484d LJ	35	struct mbox_chan *tx_channel;
	36	struct mbox_chan *rx_channel;
	37	char *rx_buffer;
	38	char *signal;
	39	char *message;
	40	spinlock_t lock;
	41	};
	42
	43	static ssize_t mbox_test_signal_write(struct file *filp,
	44	const char __user *userbuf,
	45	size_t count, loff_t *ppos)
	46	{
	47	struct mbox_test_device *tdev = filp->private_data;
	48	int ret;
	49
	50	if (!tdev->tx_channel) {
	51	dev_err(tdev->dev, "Channel cannot do Tx\n");
	52	return -EINVAL;
	53	}
	54
	55	if (count > MBOX_MAX_SIG_LEN) {
	56	dev_err(tdev->dev,
6c03663f	57	"Signal length %zd greater than max allowed %d\n",
8ea4484d LJ	58	count, MBOX_MAX_SIG_LEN);
	59	return -EINVAL;
	60	}
	61
	62	tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
	63	if (!tdev->signal)
	64	return -ENOMEM;
	65
	66	ret = copy_from_user(tdev->signal, userbuf, count);
	67	if (ret) {
	68	kfree(tdev->signal);
	69	return -EFAULT;
	70	}
	71
	72	return ret < 0 ? ret : count;
	73	}
	74
	75	static const struct file_operations mbox_test_signal_ops = {
	76	.write = mbox_test_signal_write,
	77	.open = simple_open,
	78	.llseek = generic_file_llseek,
	79	};
	80
	81	static ssize_t mbox_test_message_write(struct file *filp,
	82	const char __user *userbuf,
	83	size_t count, loff_t *ppos)
	84	{
	85	struct mbox_test_device *tdev = filp->private_data;
	86	void *data;
	87	int ret;
	88
	89	if (!tdev->tx_channel) {
	90	dev_err(tdev->dev, "Channel cannot do Tx\n");
	91	return -EINVAL;
	92	}
	93
	94	if (count > MBOX_MAX_MSG_LEN) {
	95	dev_err(tdev->dev,
6c03663f	96	"Message length %zd greater than max allowed %d\n",
8ea4484d LJ	97	count, MBOX_MAX_MSG_LEN);
	98	return -EINVAL;
	99	}
	100
	101	tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
	102	if (!tdev->message)
	103	return -ENOMEM;
	104
	105	ret = copy_from_user(tdev->message, userbuf, count);
	106	if (ret) {
	107	ret = -EFAULT;
	108	goto out;
	109	}
	110
	111	/*
	112	* A separate signal is only of use if there is
	113	* MMIO to subsequently pass the message through
	114	*/
	115	if (tdev->mmio && tdev->signal) {
27fa680f SH	116	print_hex_dump_bytes("Client: Sending: Signal: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	117	tdev->signal, MBOX_MAX_SIG_LEN);
8ea4484d LJ	118
	119	data = tdev->signal;
	120	} else
	121	data = tdev->message;
	122
27fa680f SH	123	print_hex_dump_bytes("Client: Sending: Message: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	124	tdev->message, MBOX_MAX_MSG_LEN);
8ea4484d LJ	125
	126	ret = mbox_send_message(tdev->tx_channel, data);
	127	if (ret < 0)
	128	dev_err(tdev->dev, "Failed to send message via mailbox\n");
	129
	130	out:
	131	kfree(tdev->signal);
	132	kfree(tdev->message);
	133
	134	return ret < 0 ? ret : count;
	135	}
	136
	137	static ssize_t mbox_test_message_read(struct file filp, char __user userbuf,
	138	size_t count, loff_t *ppos)
	139	{
	140	struct mbox_test_device *tdev = filp->private_data;
	141	unsigned long flags;
	142	char touser, ptr;
	143	int l = 0;
	144	int ret;
	145
c3ac54a6	146	touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
8ea4484d LJ	147	if (!touser)
	148	return -ENOMEM;
	149
	150	if (!tdev->rx_channel) {
	151	ret = snprintf(touser, 20, "<NO RX CAPABILITY>\n");
	152	ret = simple_read_from_buffer(userbuf, count, ppos,
	153	touser, ret);
	154	goto out;
	155	}
	156
	157	if (tdev->rx_buffer[0] == '\0') {
	158	ret = snprintf(touser, 9, "<EMPTY>\n");
	159	ret = simple_read_from_buffer(userbuf, count, ppos,
	160	touser, ret);
	161	goto out;
	162	}
	163
	164	spin_lock_irqsave(&tdev->lock, flags);
	165
	166	ptr = tdev->rx_buffer;
	167	while (l < MBOX_HEXDUMP_MAX_LEN) {
	168	hex_dump_to_buffer(ptr,
	169	MBOX_BYTES_PER_LINE,
	170	MBOX_BYTES_PER_LINE, 1, touser + l,
	171	MBOX_HEXDUMP_LINE_LEN, true);
	172
	173	ptr += MBOX_BYTES_PER_LINE;
	174	l += MBOX_HEXDUMP_LINE_LEN;
	175	*(touser + (l - 1)) = '\n';
	176	}
	177	*(touser + l) = '\0';
	178
	179	memset(tdev->rx_buffer, 0, MBOX_MAX_MSG_LEN);
	180
	181	spin_unlock_irqrestore(&tdev->lock, flags);
	182
	183	ret = simple_read_from_buffer(userbuf, count, ppos, touser, MBOX_HEXDUMP_MAX_LEN);
	184	out:
	185	kfree(touser);
	186	return ret;
	187	}
	188
	189	static const struct file_operations mbox_test_message_ops = {
	190	.write = mbox_test_message_write,
	191	.read = mbox_test_message_read,
	192	.open = simple_open,
	193	.llseek = generic_file_llseek,
	194	};
	195
	196	static int mbox_test_add_debugfs(struct platform_device *pdev,
	197	struct mbox_test_device *tdev)
	198	{
	199	if (!debugfs_initialized())
	200	return 0;
	201
	202	root_debugfs_dir = debugfs_create_dir("mailbox", NULL);
	203	if (!root_debugfs_dir) {
	204	dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
	205	return -EINVAL;
	206	}
	207
	208	debugfs_create_file("message", 0600, root_debugfs_dir,
	209	tdev, &mbox_test_message_ops);
	210
211	debugfs_create_file("signal", 0200, root_debugfs_dir,
212	tdev, &mbox_test_signal_ops);
213
214	return 0;
215	}
216
217	static void mbox_test_receive_message(struct mbox_client client, void message)
218	{
219	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
220	unsigned long flags;
221
222	spin_lock_irqsave(&tdev->lock, flags);
223	if (tdev->mmio) {
cb1ca0b3	224	memcpy_fromio(tdev->rx_buffer, tdev->mmio, MBOX_MAX_MSG_LEN);
27fa680f SH	225	print_hex_dump_bytes("Client: Received [MMIO]: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	226	tdev->rx_buffer, MBOX_MAX_MSG_LEN);
8ea4484d	227	} else if (message) {
27fa680f SH	228	print_hex_dump_bytes("Client: Received [API]: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	229	message, MBOX_MAX_MSG_LEN);
8ea4484d LJ	230	memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
	231	}
	232	spin_unlock_irqrestore(&tdev->lock, flags);
	233	}
	234
	235	static void mbox_test_prepare_message(struct mbox_client client, void message)
	236	{
	237	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
	238
	239	if (tdev->mmio) {
	240	if (tdev->signal)
a133f8b6	241	memcpy_toio(tdev->mmio, tdev->message, MBOX_MAX_MSG_LEN);
8ea4484d	242	else
a133f8b6	243	memcpy_toio(tdev->mmio, message, MBOX_MAX_MSG_LEN);
8ea4484d LJ	244	}
	245	}
	246
	247	static void mbox_test_message_sent(struct mbox_client *client,
	248	void *message, int r)
	249	{
	250	if (r)
	251	dev_warn(client->dev,
	252	"Client: Message could not be sent: %d\n", r);
	253	else
	254	dev_info(client->dev,
	255	"Client: Message sent\n");
	256	}
	257
	258	static struct mbox_chan *
	259	mbox_test_request_channel(struct platform_device pdev, const char name)
	260	{
	261	struct mbox_client *client;
	262	struct mbox_chan *channel;
	263
	264	client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
	265	if (!client)
	266	return ERR_PTR(-ENOMEM);
	267
	268	client->dev = &pdev->dev;
	269	client->rx_callback = mbox_test_receive_message;
	270	client->tx_prepare = mbox_test_prepare_message;
	271	client->tx_done = mbox_test_message_sent;
	272	client->tx_block = true;
	273	client->knows_txdone = false;
	274	client->tx_tout = 500;
	275
	276	channel = mbox_request_channel_byname(client, name);
	277	if (IS_ERR(channel)) {
	278	dev_warn(&pdev->dev, "Failed to request %s channel\n", name);
	279	return NULL;
	280	}
	281
	282	return channel;
	283	}
	284
	285	static int mbox_test_probe(struct platform_device *pdev)
	286	{
	287	struct mbox_test_device *tdev;
	288	struct resource *res;
	289	int ret;
	290
	291	tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
	292	if (!tdev)
	293	return -ENOMEM;
	294
	295	/* It's okay for MMIO to be NULL */
	296	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	297	tdev->mmio = devm_ioremap_resource(&pdev->dev, res);
	298	if (IS_ERR(tdev->mmio))
	299	tdev->mmio = NULL;
	300
	301	tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
	302	tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
	303
6c03663f	304	if (!tdev->tx_channel && !tdev->rx_channel)
8ea4484d LJ	305	return -EPROBE_DEFER;
	306
	307	tdev->dev = &pdev->dev;
	308	platform_set_drvdata(pdev, tdev);
	309
	310	spin_lock_init(&tdev->lock);
	311
	312	if (tdev->rx_channel) {
	313	tdev->rx_buffer = devm_kzalloc(&pdev->dev,
	314	MBOX_MAX_MSG_LEN, GFP_KERNEL);
	315	if (!tdev->rx_buffer)
	316	return -ENOMEM;
	317	}
	318
	319	ret = mbox_test_add_debugfs(pdev, tdev);
	320	if (ret)
	321	return ret;
	322
	323	dev_info(&pdev->dev, "Successfully registered\n");
	324
	325	return 0;
	326	}
	327
	328	static int mbox_test_remove(struct platform_device *pdev)
	329	{
	330	struct mbox_test_device *tdev = platform_get_drvdata(pdev);
	331
	332	debugfs_remove_recursive(root_debugfs_dir);
	333
	334	if (tdev->tx_channel)
	335	mbox_free_channel(tdev->tx_channel);
	336	if (tdev->rx_channel)
	337	mbox_free_channel(tdev->rx_channel);
	338
	339	return 0;
	340	}
	341
	342	static const struct of_device_id mbox_test_match[] = {
c4280137	343	{ .compatible = "mailbox-test" },
8ea4484d LJ	344	{},
	345	};
	346
	347	static struct platform_driver mbox_test_driver = {
	348	.driver = {
adf06ba9	349	.name = "mailbox_test",
8ea4484d LJ	350	.of_match_table = mbox_test_match,
	351	},
	352	.probe = mbox_test_probe,
	353	.remove = mbox_test_remove,
	354	};
	355	module_platform_driver(mbox_test_driver);
	356
	357	MODULE_DESCRIPTION("Generic Mailbox Testing Facility");
	358	MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
	359	MODULE_LICENSE("GPL v2");