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617d3293 AP |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Copyright (C) 2022, STMicroelectronics | |
4 | * Copyright (c) 2016, Linaro Ltd. | |
5 | * Copyright (c) 2012, Michal Simek <monstr@monstr.eu> | |
6 | * Copyright (c) 2012, PetaLogix | |
7 | * Copyright (c) 2011, Texas Instruments, Inc. | |
8 | * Copyright (c) 2011, Google, Inc. | |
9 | * | |
10 | * Based on rpmsg performance statistics driver by Michal Simek, which in turn | |
11 | * was based on TI & Google OMX rpmsg driver. | |
12 | */ | |
13 | ||
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
16 | #include <linux/cdev.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/fs.h> | |
19 | #include <linux/idr.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/rpmsg.h> | |
23 | #include <linux/skbuff.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/uaccess.h> | |
26 | #include <uapi/linux/rpmsg.h> | |
27 | ||
28 | #include "rpmsg_char.h" | |
29 | #include "rpmsg_internal.h" | |
30 | ||
31 | #define RPMSG_DEV_MAX (MINORMASK + 1) | |
32 | ||
33 | static dev_t rpmsg_major; | |
34 | ||
35 | static DEFINE_IDA(rpmsg_ctrl_ida); | |
36 | static DEFINE_IDA(rpmsg_minor_ida); | |
37 | ||
38 | #define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev) | |
39 | #define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev) | |
40 | ||
41 | /** | |
42 | * struct rpmsg_ctrldev - control device for instantiating endpoint devices | |
43 | * @rpdev: underlaying rpmsg device | |
44 | * @cdev: cdev for the ctrl device | |
45 | * @dev: device for the ctrl device | |
8109517b | 46 | * @ctrl_lock: serialize the ioctrls. |
617d3293 AP |
47 | */ |
48 | struct rpmsg_ctrldev { | |
49 | struct rpmsg_device *rpdev; | |
50 | struct cdev cdev; | |
51 | struct device dev; | |
8109517b | 52 | struct mutex ctrl_lock; |
617d3293 AP |
53 | }; |
54 | ||
55 | static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp) | |
56 | { | |
57 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
58 | ||
59 | get_device(&ctrldev->dev); | |
60 | filp->private_data = ctrldev; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp) | |
66 | { | |
67 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
68 | ||
69 | put_device(&ctrldev->dev); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, | |
75 | unsigned long arg) | |
76 | { | |
77 | struct rpmsg_ctrldev *ctrldev = fp->private_data; | |
78 | void __user *argp = (void __user *)arg; | |
79 | struct rpmsg_endpoint_info eptinfo; | |
80 | struct rpmsg_channel_info chinfo; | |
8109517b AP |
81 | struct rpmsg_device *rpdev; |
82 | int ret = 0; | |
617d3293 AP |
83 | |
84 | if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) | |
85 | return -EFAULT; | |
86 | ||
87 | memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); | |
88 | chinfo.name[RPMSG_NAME_SIZE - 1] = '\0'; | |
89 | chinfo.src = eptinfo.src; | |
90 | chinfo.dst = eptinfo.dst; | |
91 | ||
8109517b AP |
92 | mutex_lock(&ctrldev->ctrl_lock); |
93 | switch (cmd) { | |
94 | case RPMSG_CREATE_EPT_IOCTL: | |
95 | ret = rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo); | |
96 | break; | |
97 | ||
98 | case RPMSG_CREATE_DEV_IOCTL: | |
99 | rpdev = rpmsg_create_channel(ctrldev->rpdev, &chinfo); | |
100 | if (!rpdev) { | |
101 | dev_err(&ctrldev->dev, "failed to create %s channel\n", chinfo.name); | |
102 | ret = -ENXIO; | |
103 | } | |
104 | break; | |
105 | ||
106 | case RPMSG_RELEASE_DEV_IOCTL: | |
107 | ret = rpmsg_release_channel(ctrldev->rpdev, &chinfo); | |
108 | if (ret) | |
109 | dev_err(&ctrldev->dev, "failed to release %s channel (%d)\n", | |
110 | chinfo.name, ret); | |
111 | break; | |
112 | ||
113 | default: | |
114 | ret = -EINVAL; | |
115 | } | |
116 | mutex_unlock(&ctrldev->ctrl_lock); | |
117 | ||
118 | return ret; | |
617d3293 AP |
119 | }; |
120 | ||
121 | static const struct file_operations rpmsg_ctrldev_fops = { | |
122 | .owner = THIS_MODULE, | |
123 | .open = rpmsg_ctrldev_open, | |
124 | .release = rpmsg_ctrldev_release, | |
125 | .unlocked_ioctl = rpmsg_ctrldev_ioctl, | |
126 | .compat_ioctl = compat_ptr_ioctl, | |
127 | }; | |
128 | ||
129 | static void rpmsg_ctrldev_release_device(struct device *dev) | |
130 | { | |
131 | struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev); | |
132 | ||
133 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
134 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
135 | kfree(ctrldev); | |
136 | } | |
137 | ||
138 | static int rpmsg_ctrldev_probe(struct rpmsg_device *rpdev) | |
139 | { | |
140 | struct rpmsg_ctrldev *ctrldev; | |
141 | struct device *dev; | |
142 | int ret; | |
143 | ||
144 | ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); | |
145 | if (!ctrldev) | |
146 | return -ENOMEM; | |
147 | ||
148 | ctrldev->rpdev = rpdev; | |
149 | ||
150 | dev = &ctrldev->dev; | |
151 | device_initialize(dev); | |
152 | dev->parent = &rpdev->dev; | |
153 | dev->class = rpmsg_class; | |
154 | ||
8109517b | 155 | mutex_init(&ctrldev->ctrl_lock); |
617d3293 AP |
156 | cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); |
157 | ctrldev->cdev.owner = THIS_MODULE; | |
158 | ||
159 | ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); | |
160 | if (ret < 0) | |
161 | goto free_ctrldev; | |
162 | dev->devt = MKDEV(MAJOR(rpmsg_major), ret); | |
163 | ||
164 | ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); | |
165 | if (ret < 0) | |
166 | goto free_minor_ida; | |
167 | dev->id = ret; | |
168 | dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); | |
169 | ||
170 | ret = cdev_device_add(&ctrldev->cdev, &ctrldev->dev); | |
171 | if (ret) | |
172 | goto free_ctrl_ida; | |
173 | ||
174 | /* We can now rely on the release function for cleanup */ | |
175 | dev->release = rpmsg_ctrldev_release_device; | |
176 | ||
177 | dev_set_drvdata(&rpdev->dev, ctrldev); | |
178 | ||
179 | return ret; | |
180 | ||
181 | free_ctrl_ida: | |
182 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
183 | free_minor_ida: | |
184 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
185 | free_ctrldev: | |
186 | put_device(dev); | |
187 | kfree(ctrldev); | |
188 | ||
189 | return ret; | |
190 | } | |
191 | ||
192 | static void rpmsg_ctrldev_remove(struct rpmsg_device *rpdev) | |
193 | { | |
194 | struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); | |
195 | int ret; | |
196 | ||
c23965b7 | 197 | mutex_lock(&ctrldev->ctrl_lock); |
617d3293 AP |
198 | /* Destroy all endpoints */ |
199 | ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_eptdev_destroy); | |
200 | if (ret) | |
201 | dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); | |
c23965b7 | 202 | mutex_unlock(&ctrldev->ctrl_lock); |
617d3293 AP |
203 | |
204 | cdev_device_del(&ctrldev->cdev, &ctrldev->dev); | |
205 | put_device(&ctrldev->dev); | |
206 | } | |
207 | ||
208 | static struct rpmsg_driver rpmsg_ctrldev_driver = { | |
209 | .probe = rpmsg_ctrldev_probe, | |
210 | .remove = rpmsg_ctrldev_remove, | |
211 | .drv = { | |
472f84ee | 212 | .name = "rpmsg_ctrl", |
617d3293 AP |
213 | }, |
214 | }; | |
215 | ||
216 | static int rpmsg_ctrldev_init(void) | |
217 | { | |
218 | int ret; | |
219 | ||
220 | ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg_ctrl"); | |
221 | if (ret < 0) { | |
222 | pr_err("failed to allocate char dev region\n"); | |
223 | return ret; | |
224 | } | |
225 | ||
226 | ret = register_rpmsg_driver(&rpmsg_ctrldev_driver); | |
227 | if (ret < 0) { | |
228 | pr_err("failed to register rpmsg driver\n"); | |
229 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
230 | } | |
231 | ||
232 | return ret; | |
233 | } | |
234 | postcore_initcall(rpmsg_ctrldev_init); | |
235 | ||
236 | static void rpmsg_ctrldev_exit(void) | |
237 | { | |
238 | unregister_rpmsg_driver(&rpmsg_ctrldev_driver); | |
239 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
240 | } | |
241 | module_exit(rpmsg_ctrldev_exit); | |
242 | ||
243 | MODULE_DESCRIPTION("rpmsg control interface"); | |
244 | MODULE_ALIAS("rpmsg:" KBUILD_MODNAME); | |
245 | MODULE_LICENSE("GPL v2"); |