[linux-2.6-block.git] / drivers / soc / qcom / rmtfs_mem.c

/*
 * Copyright (c) 2017 Linaro Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/cdev.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_reserved_mem.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/qcom_scm.h>

#define QCOM_RMTFS_MEM_DEV_MAX	(MINORMASK + 1)

static dev_t qcom_rmtfs_mem_major;

struct qcom_rmtfs_mem {
	struct device dev;
	struct cdev cdev;

	void *base;
	phys_addr_t addr;
	phys_addr_t size;

	unsigned int client_id;

	unsigned int perms;
};

static ssize_t qcom_rmtfs_mem_show(struct device *dev,
			      struct device_attribute *attr,
			      char *buf);

static DEVICE_ATTR(phys_addr, 0444, qcom_rmtfs_mem_show, NULL);
static DEVICE_ATTR(size, 0444, qcom_rmtfs_mem_show, NULL);
static DEVICE_ATTR(client_id, 0444, qcom_rmtfs_mem_show, NULL);

static ssize_t qcom_rmtfs_mem_show(struct device *dev,
			      struct device_attribute *attr,
			      char *buf)
{
	struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev,
							struct qcom_rmtfs_mem,
							dev);

	if (attr == &dev_attr_phys_addr)
		return sprintf(buf, "%pa\n", &rmtfs_mem->addr);
	if (attr == &dev_attr_size)
		return sprintf(buf, "%pa\n", &rmtfs_mem->size);
	if (attr == &dev_attr_client_id)
		return sprintf(buf, "%d\n", rmtfs_mem->client_id);

	return -EINVAL;
}

static struct attribute *qcom_rmtfs_mem_attrs[] = {
	&dev_attr_phys_addr.attr,
	&dev_attr_size.attr,
	&dev_attr_client_id.attr,
	NULL
};
ATTRIBUTE_GROUPS(qcom_rmtfs_mem);

static int qcom_rmtfs_mem_open(struct inode *inode, struct file *filp)
{
	struct qcom_rmtfs_mem *rmtfs_mem = container_of(inode->i_cdev,
							struct qcom_rmtfs_mem,
							cdev);

	get_device(&rmtfs_mem->dev);
	filp->private_data = rmtfs_mem;

	return 0;
}
static ssize_t qcom_rmtfs_mem_read(struct file *filp,
			      char __user *buf, size_t count, loff_t *f_pos)
{
	struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;

	if (*f_pos >= rmtfs_mem->size)
		return 0;

	if (*f_pos + count >= rmtfs_mem->size)
		count = rmtfs_mem->size - *f_pos;

	if (copy_to_user(buf, rmtfs_mem->base + *f_pos, count))
		return -EFAULT;

	*f_pos += count;
	return count;
}

static ssize_t qcom_rmtfs_mem_write(struct file *filp,
			       const char __user *buf, size_t count,
			       loff_t *f_pos)
{
	struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;

	if (*f_pos >= rmtfs_mem->size)
		return 0;

	if (*f_pos + count >= rmtfs_mem->size)
		count = rmtfs_mem->size - *f_pos;

	if (copy_from_user(rmtfs_mem->base + *f_pos, buf, count))
		return -EFAULT;

	*f_pos += count;
	return count;
}

static int qcom_rmtfs_mem_release(struct inode *inode, struct file *filp)
{
	struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;

	put_device(&rmtfs_mem->dev);

	return 0;
}

static struct class rmtfs_class = {
	.owner          = THIS_MODULE,
	.name           = "rmtfs",
};

static int qcom_rmtfs_mem_mmap(struct file *filep, struct vm_area_struct *vma)
{
	struct qcom_rmtfs_mem *rmtfs_mem = filep->private_data;

	if (vma->vm_end - vma->vm_start > rmtfs_mem->size) {
		dev_dbg(&rmtfs_mem->dev,
			"vm_end[%lu] - vm_start[%lu] [%lu] > mem->size[%pa]\n",
			vma->vm_end, vma->vm_start,
			(vma->vm_end - vma->vm_start), &rmtfs_mem->size);
		return -EINVAL;
	}

	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
	return remap_pfn_range(vma,
			       vma->vm_start,
			       rmtfs_mem->addr >> PAGE_SHIFT,
			       vma->vm_end - vma->vm_start,
			       vma->vm_page_prot);
}

static const struct file_operations qcom_rmtfs_mem_fops = {
	.owner = THIS_MODULE,
	.open = qcom_rmtfs_mem_open,
	.read = qcom_rmtfs_mem_read,
	.write = qcom_rmtfs_mem_write,
	.release = qcom_rmtfs_mem_release,
	.llseek = default_llseek,
	.mmap = qcom_rmtfs_mem_mmap,
};

static void qcom_rmtfs_mem_release_device(struct device *dev)
{
	struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev,
							struct qcom_rmtfs_mem,
							dev);

	kfree(rmtfs_mem);
}

static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
{
	struct device_node *node = pdev->dev.of_node;
	struct qcom_scm_vmperm perms[2];
	struct reserved_mem *rmem;
	struct qcom_rmtfs_mem *rmtfs_mem;
	u32 client_id;
	u32 vmid;
	int ret;

	rmem = of_reserved_mem_lookup(node);
	if (!rmem) {
		dev_err(&pdev->dev, "failed to acquire memory region\n");
		return -EINVAL;
	}

	ret = of_property_read_u32(node, "qcom,client-id", &client_id);
	if (ret) {
		dev_err(&pdev->dev, "failed to parse \"qcom,client-id\"\n");
		return ret;

	}

	rmtfs_mem = kzalloc(sizeof(*rmtfs_mem), GFP_KERNEL);
	if (!rmtfs_mem)
		return -ENOMEM;

	rmtfs_mem->addr = rmem->base;
	rmtfs_mem->client_id = client_id;
	rmtfs_mem->size = rmem->size;

	device_initialize(&rmtfs_mem->dev);
	rmtfs_mem->dev.parent = &pdev->dev;
	rmtfs_mem->dev.groups = qcom_rmtfs_mem_groups;
	rmtfs_mem->dev.release = qcom_rmtfs_mem_release_device;

	rmtfs_mem->base = devm_memremap(&rmtfs_mem->dev, rmtfs_mem->addr,
					rmtfs_mem->size, MEMREMAP_WC);
	if (IS_ERR(rmtfs_mem->base)) {
		dev_err(&pdev->dev, "failed to remap rmtfs_mem region\n");
		ret = PTR_ERR(rmtfs_mem->base);
		goto put_device;
	}

	cdev_init(&rmtfs_mem->cdev, &qcom_rmtfs_mem_fops);
	rmtfs_mem->cdev.owner = THIS_MODULE;

	dev_set_name(&rmtfs_mem->dev, "qcom_rmtfs_mem%d", client_id);
	rmtfs_mem->dev.id = client_id;
	rmtfs_mem->dev.class = &rmtfs_class;
	rmtfs_mem->dev.devt = MKDEV(MAJOR(qcom_rmtfs_mem_major), client_id);

	ret = cdev_device_add(&rmtfs_mem->cdev, &rmtfs_mem->dev);
	if (ret) {
		dev_err(&pdev->dev, "failed to add cdev: %d\n", ret);
		goto put_device;
	}

	ret = of_property_read_u32(node, "qcom,vmid", &vmid);
	if (ret < 0 && ret != -EINVAL) {
		dev_err(&pdev->dev, "failed to parse qcom,vmid\n");
		goto remove_cdev;
	} else if (!ret) {
		if (!qcom_scm_is_available()) {
			ret = -EPROBE_DEFER;
			goto remove_cdev;
		}

		perms[0].vmid = QCOM_SCM_VMID_HLOS;
		perms[0].perm = QCOM_SCM_PERM_RW;
		perms[1].vmid = vmid;
		perms[1].perm = QCOM_SCM_PERM_RW;

		rmtfs_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
		ret = qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
					  &rmtfs_mem->perms, perms, 2);
		if (ret < 0) {
			dev_err(&pdev->dev, "assign memory failed\n");
			goto remove_cdev;
		}
	}

	dev_set_drvdata(&pdev->dev, rmtfs_mem);

	return 0;

remove_cdev:
	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
put_device:
	put_device(&rmtfs_mem->dev);

	return ret;
}

static int qcom_rmtfs_mem_remove(struct platform_device *pdev)
{
	struct qcom_rmtfs_mem *rmtfs_mem = dev_get_drvdata(&pdev->dev);
	struct qcom_scm_vmperm perm;

	if (rmtfs_mem->perms) {
		perm.vmid = QCOM_SCM_VMID_HLOS;
		perm.perm = QCOM_SCM_PERM_RW;

		qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
				    &rmtfs_mem->perms, &perm, 1);
	}

	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
	put_device(&rmtfs_mem->dev);

	return 0;
}

static const struct of_device_id qcom_rmtfs_mem_of_match[] = {
	{ .compatible = "qcom,rmtfs-mem" },
	{}
};
MODULE_DEVICE_TABLE(of, qcom_rmtfs_mem_of_match);

static struct platform_driver qcom_rmtfs_mem_driver = {
	.probe = qcom_rmtfs_mem_probe,
	.remove = qcom_rmtfs_mem_remove,
	.driver  = {
		.name  = "qcom_rmtfs_mem",
		.of_match_table = qcom_rmtfs_mem_of_match,
	},
};

static int __init qcom_rmtfs_mem_init(void)
{
	int ret;

	ret = class_register(&rmtfs_class);
	if (ret)
		return ret;

	ret = alloc_chrdev_region(&qcom_rmtfs_mem_major, 0,
				  QCOM_RMTFS_MEM_DEV_MAX, "qcom_rmtfs_mem");
	if (ret < 0) {
		pr_err("qcom_rmtfs_mem: failed to allocate char dev region\n");
		goto unregister_class;
	}

	ret = platform_driver_register(&qcom_rmtfs_mem_driver);
	if (ret < 0) {
		pr_err("qcom_rmtfs_mem: failed to register rmtfs_mem driver\n");
		goto unregister_chrdev;
	}

	return 0;

unregister_chrdev:
	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
unregister_class:
	class_unregister(&rmtfs_class);
	return ret;
}
module_init(qcom_rmtfs_mem_init);

static void __exit qcom_rmtfs_mem_exit(void)
{
	platform_driver_unregister(&qcom_rmtfs_mem_driver);
	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
	class_unregister(&rmtfs_class);
}
module_exit(qcom_rmtfs_mem_exit);

MODULE_AUTHOR("Linaro Ltd");
MODULE_DESCRIPTION("Qualcomm Remote Filesystem memory driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d1de6d6c BA	1	/*
	2	* Copyright (c) 2017 Linaro Ltd.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 and
	6	* only version 2 as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/cdev.h>
	16	#include <linux/err.h>
	17	#include <linux/module.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/of.h>
	20	#include <linux/of_reserved_mem.h>
	21	#include <linux/dma-mapping.h>
	22	#include <linux/slab.h>
	23	#include <linux/uaccess.h>
	24	#include <linux/io.h>
	25	#include <linux/qcom_scm.h>
	26
	27	#define QCOM_RMTFS_MEM_DEV_MAX (MINORMASK + 1)
	28
	29	static dev_t qcom_rmtfs_mem_major;
	30
	31	struct qcom_rmtfs_mem {
	32	struct device dev;
	33	struct cdev cdev;
	34
	35	void *base;
	36	phys_addr_t addr;
	37	phys_addr_t size;
	38
	39	unsigned int client_id;
fa65f804 BA	40
fa65f804 BA	41	unsigned int perms;
d1de6d6c BA	42	};
	43
	44	static ssize_t qcom_rmtfs_mem_show(struct device *dev,
	45	struct device_attribute *attr,
	46	char *buf);
	47
f58b0f9d EG	48	static DEVICE_ATTR(phys_addr, 0444, qcom_rmtfs_mem_show, NULL);
	49	static DEVICE_ATTR(size, 0444, qcom_rmtfs_mem_show, NULL);
	50	static DEVICE_ATTR(client_id, 0444, qcom_rmtfs_mem_show, NULL);
d1de6d6c BA	51
	52	static ssize_t qcom_rmtfs_mem_show(struct device *dev,
	53	struct device_attribute *attr,
	54	char *buf)
	55	{
	56	struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev,
	57	struct qcom_rmtfs_mem,
	58	dev);
	59
	60	if (attr == &dev_attr_phys_addr)
	61	return sprintf(buf, "%pa\n", &rmtfs_mem->addr);
	62	if (attr == &dev_attr_size)
	63	return sprintf(buf, "%pa\n", &rmtfs_mem->size);
	64	if (attr == &dev_attr_client_id)
	65	return sprintf(buf, "%d\n", rmtfs_mem->client_id);
	66
	67	return -EINVAL;
	68	}
	69
	70	static struct attribute *qcom_rmtfs_mem_attrs[] = {
	71	&dev_attr_phys_addr.attr,
	72	&dev_attr_size.attr,
	73	&dev_attr_client_id.attr,
	74	NULL
	75	};
	76	ATTRIBUTE_GROUPS(qcom_rmtfs_mem);
	77
	78	static int qcom_rmtfs_mem_open(struct inode inode, struct file filp)
	79	{
	80	struct qcom_rmtfs_mem *rmtfs_mem = container_of(inode->i_cdev,
	81	struct qcom_rmtfs_mem,
	82	cdev);
	83
	84	get_device(&rmtfs_mem->dev);
	85	filp->private_data = rmtfs_mem;
	86
	87	return 0;
	88	}
	89	static ssize_t qcom_rmtfs_mem_read(struct file *filp,
	90	char __user buf, size_t count, loff_t f_pos)
	91	{
	92	struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;
	93
	94	if (*f_pos >= rmtfs_mem->size)
	95	return 0;
	96
	97	if (*f_pos + count >= rmtfs_mem->size)
	98	count = rmtfs_mem->size - *f_pos;
	99
	100	if (copy_to_user(buf, rmtfs_mem->base + *f_pos, count))
	101	return -EFAULT;
	102
	103	*f_pos += count;
	104	return count;
	105	}
	106
	107	static ssize_t qcom_rmtfs_mem_write(struct file *filp,
	108	const char __user *buf, size_t count,
	109	loff_t *f_pos)
	110	{
	111	struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;
	112
	113	if (*f_pos >= rmtfs_mem->size)
	114	return 0;
115
116	if (*f_pos + count >= rmtfs_mem->size)
117	count = rmtfs_mem->size - *f_pos;
118
119	if (copy_from_user(rmtfs_mem->base + *f_pos, buf, count))
120	return -EFAULT;
121
122	*f_pos += count;
123	return count;
124	}
125
126	static int qcom_rmtfs_mem_release(struct inode inode, struct file filp)
127	{
128	struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;
129
130	put_device(&rmtfs_mem->dev);
131
132	return 0;
133	}
134
b4aa93bc EG	135	static struct class rmtfs_class = {
	136	.owner = THIS_MODULE,
	137	.name = "rmtfs",
	138	};
	139
8da3daaa AJ	140	static int qcom_rmtfs_mem_mmap(struct file filep, struct vm_area_struct vma)
	141	{
	142	struct qcom_rmtfs_mem *rmtfs_mem = filep->private_data;
	143
	144	if (vma->vm_end - vma->vm_start > rmtfs_mem->size) {
	145	dev_dbg(&rmtfs_mem->dev,
	146	"vm_end[%lu] - vm_start[%lu] [%lu] > mem->size[%pa]\n",
	147	vma->vm_end, vma->vm_start,
	148	(vma->vm_end - vma->vm_start), &rmtfs_mem->size);
	149	return -EINVAL;
	150	}
	151
	152	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
	153	return remap_pfn_range(vma,
	154	vma->vm_start,
	155	rmtfs_mem->addr >> PAGE_SHIFT,
	156	vma->vm_end - vma->vm_start,
	157	vma->vm_page_prot);
	158	}
	159
d1de6d6c BA	160	static const struct file_operations qcom_rmtfs_mem_fops = {
	161	.owner = THIS_MODULE,
	162	.open = qcom_rmtfs_mem_open,
	163	.read = qcom_rmtfs_mem_read,
	164	.write = qcom_rmtfs_mem_write,
	165	.release = qcom_rmtfs_mem_release,
	166	.llseek = default_llseek,
8da3daaa	167	.mmap = qcom_rmtfs_mem_mmap,
d1de6d6c BA	168	};
	169
	170	static void qcom_rmtfs_mem_release_device(struct device *dev)
	171	{
	172	struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev,
	173	struct qcom_rmtfs_mem,
	174	dev);
	175
	176	kfree(rmtfs_mem);
	177	}
	178
	179	static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
	180	{
	181	struct device_node *node = pdev->dev.of_node;
fa65f804	182	struct qcom_scm_vmperm perms[2];
d1de6d6c BA	183	struct reserved_mem *rmem;
	184	struct qcom_rmtfs_mem *rmtfs_mem;
	185	u32 client_id;
fa65f804	186	u32 vmid;
d1de6d6c BA	187	int ret;
	188
	189	rmem = of_reserved_mem_lookup(node);
	190	if (!rmem) {
	191	dev_err(&pdev->dev, "failed to acquire memory region\n");
	192	return -EINVAL;
	193	}
	194
	195	ret = of_property_read_u32(node, "qcom,client-id", &client_id);
	196	if (ret) {
	197	dev_err(&pdev->dev, "failed to parse \"qcom,client-id\"\n");
	198	return ret;
	199
	200	}
	201
	202	rmtfs_mem = kzalloc(sizeof(*rmtfs_mem), GFP_KERNEL);
	203	if (!rmtfs_mem)
	204	return -ENOMEM;
	205
	206	rmtfs_mem->addr = rmem->base;
	207	rmtfs_mem->client_id = client_id;
	208	rmtfs_mem->size = rmem->size;
	209
	210	device_initialize(&rmtfs_mem->dev);
	211	rmtfs_mem->dev.parent = &pdev->dev;
	212	rmtfs_mem->dev.groups = qcom_rmtfs_mem_groups;
78ee559d	213	rmtfs_mem->dev.release = qcom_rmtfs_mem_release_device;
d1de6d6c BA	214
	215	rmtfs_mem->base = devm_memremap(&rmtfs_mem->dev, rmtfs_mem->addr,
	216	rmtfs_mem->size, MEMREMAP_WC);
	217	if (IS_ERR(rmtfs_mem->base)) {
	218	dev_err(&pdev->dev, "failed to remap rmtfs_mem region\n");
	219	ret = PTR_ERR(rmtfs_mem->base);
	220	goto put_device;
	221	}
	222
	223	cdev_init(&rmtfs_mem->cdev, &qcom_rmtfs_mem_fops);
	224	rmtfs_mem->cdev.owner = THIS_MODULE;
	225
	226	dev_set_name(&rmtfs_mem->dev, "qcom_rmtfs_mem%d", client_id);
	227	rmtfs_mem->dev.id = client_id;
b4aa93bc	228	rmtfs_mem->dev.class = &rmtfs_class;
d1de6d6c BA	229	rmtfs_mem->dev.devt = MKDEV(MAJOR(qcom_rmtfs_mem_major), client_id);
	230
	231	ret = cdev_device_add(&rmtfs_mem->cdev, &rmtfs_mem->dev);
	232	if (ret) {
	233	dev_err(&pdev->dev, "failed to add cdev: %d\n", ret);
	234	goto put_device;
	235	}
	236
fa65f804 BA	237	ret = of_property_read_u32(node, "qcom,vmid", &vmid);
	238	if (ret < 0 && ret != -EINVAL) {
	239	dev_err(&pdev->dev, "failed to parse qcom,vmid\n");
	240	goto remove_cdev;
	241	} else if (!ret) {
137dc584 BA	242	if (!qcom_scm_is_available()) {
	243	ret = -EPROBE_DEFER;
	244	goto remove_cdev;
	245	}
	246
fa65f804 BA	247	perms[0].vmid = QCOM_SCM_VMID_HLOS;
	248	perms[0].perm = QCOM_SCM_PERM_RW;
	249	perms[1].vmid = vmid;
	250	perms[1].perm = QCOM_SCM_PERM_RW;
	251
	252	rmtfs_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
	253	ret = qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
	254	&rmtfs_mem->perms, perms, 2);
	255	if (ret < 0) {
	256	dev_err(&pdev->dev, "assign memory failed\n");
	257	goto remove_cdev;
	258	}
	259	}
	260
d1de6d6c BA	261	dev_set_drvdata(&pdev->dev, rmtfs_mem);
	262
	263	return 0;
	264
fa65f804 BA	265	remove_cdev:
fa65f804 BA	266	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
d1de6d6c BA	267	put_device:
	268	put_device(&rmtfs_mem->dev);
	269
	270	return ret;
	271	}
	272
	273	static int qcom_rmtfs_mem_remove(struct platform_device *pdev)
	274	{
	275	struct qcom_rmtfs_mem *rmtfs_mem = dev_get_drvdata(&pdev->dev);
fa65f804 BA	276	struct qcom_scm_vmperm perm;
	277
	278	if (rmtfs_mem->perms) {
	279	perm.vmid = QCOM_SCM_VMID_HLOS;
	280	perm.perm = QCOM_SCM_PERM_RW;
	281
	282	qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
	283	&rmtfs_mem->perms, &perm, 1);
	284	}
d1de6d6c BA	285
	286	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
	287	put_device(&rmtfs_mem->dev);
	288
	289	return 0;
	290	}
	291
	292	static const struct of_device_id qcom_rmtfs_mem_of_match[] = {
	293	{ .compatible = "qcom,rmtfs-mem" },
	294	{}
	295	};
	296	MODULE_DEVICE_TABLE(of, qcom_rmtfs_mem_of_match);
	297
	298	static struct platform_driver qcom_rmtfs_mem_driver = {
	299	.probe = qcom_rmtfs_mem_probe,
	300	.remove = qcom_rmtfs_mem_remove,
	301	.driver = {
	302	.name = "qcom_rmtfs_mem",
	303	.of_match_table = qcom_rmtfs_mem_of_match,
	304	},
	305	};
	306
b4aa93bc	307	static int __init qcom_rmtfs_mem_init(void)
d1de6d6c BA	308	{
	309	int ret;
	310
b4aa93bc EG	311	ret = class_register(&rmtfs_class);
	312	if (ret)
	313	return ret;
	314
d1de6d6c BA	315	ret = alloc_chrdev_region(&qcom_rmtfs_mem_major, 0,
	316	QCOM_RMTFS_MEM_DEV_MAX, "qcom_rmtfs_mem");
	317	if (ret < 0) {
	318	pr_err("qcom_rmtfs_mem: failed to allocate char dev region\n");
b4aa93bc	319	goto unregister_class;
d1de6d6c BA	320	}
	321
	322	ret = platform_driver_register(&qcom_rmtfs_mem_driver);
	323	if (ret < 0) {
	324	pr_err("qcom_rmtfs_mem: failed to register rmtfs_mem driver\n");
b4aa93bc	325	goto unregister_chrdev;
d1de6d6c BA	326	}
d1de6d6c BA	327
b4aa93bc EG	328	return 0;
	329
	330	unregister_chrdev:
	331	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
	332	unregister_class:
	333	class_unregister(&rmtfs_class);
d1de6d6c BA	334	return ret;
	335	}
	336	module_init(qcom_rmtfs_mem_init);
	337
b4aa93bc	338	static void __exit qcom_rmtfs_mem_exit(void)
d1de6d6c BA	339	{
	340	platform_driver_unregister(&qcom_rmtfs_mem_driver);
	341	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
b4aa93bc	342	class_unregister(&rmtfs_class);
d1de6d6c BA	343	}
d1de6d6c BA	344	module_exit(qcom_rmtfs_mem_exit);
3b229bdb JC	345
	346	MODULE_AUTHOR("Linaro Ltd");
	347	MODULE_DESCRIPTION("Qualcomm Remote Filesystem memory driver");
	348	MODULE_LICENSE("GPL v2");