^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) 2016, Linaro Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2012, Michal Simek <monstr@monstr.eu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2012, PetaLogix
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2011, Texas Instruments, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (c) 2011, Google, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Based on rpmsg performance statistics driver by Michal Simek, which in turn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * was based on TI & Google OMX rpmsg driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/cdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/rpmsg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <uapi/linux/rpmsg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "rpmsg_internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define RPMSG_DEV_MAX (MINORMASK + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static dev_t rpmsg_major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static struct class *rpmsg_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static DEFINE_IDA(rpmsg_ctrl_ida);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static DEFINE_IDA(rpmsg_ept_ida);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static DEFINE_IDA(rpmsg_minor_ida);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #define dev_to_eptdev(dev) container_of(dev, struct rpmsg_eptdev, dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define cdev_to_eptdev(i_cdev) container_of(i_cdev, struct rpmsg_eptdev, cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * struct rpmsg_ctrldev - control device for instantiating endpoint devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * @rpdev: underlaying rpmsg device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * @cdev: cdev for the ctrl device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * @dev: device for the ctrl device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct rpmsg_ctrldev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct rpmsg_device *rpdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct cdev cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct device dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * struct rpmsg_eptdev - endpoint device context
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * @dev: endpoint device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * @cdev: cdev for the endpoint device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * @rpdev: underlaying rpmsg device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * @chinfo: info used to open the endpoint
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * @ept_lock: synchronization of @ept modifications
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * @ept: rpmsg endpoint reference, when open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * @queue_lock: synchronization of @queue operations
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * @queue: incoming message queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * @readq: wait object for incoming queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct rpmsg_eptdev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct device dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct cdev cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct rpmsg_device *rpdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct rpmsg_channel_info chinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct mutex ept_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct rpmsg_endpoint *ept;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) spinlock_t queue_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct sk_buff_head queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) wait_queue_head_t readq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int rpmsg_eptdev_destroy(struct device *dev, void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) mutex_lock(&eptdev->ept_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (eptdev->ept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) rpmsg_destroy_ept(eptdev->ept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) eptdev->ept = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) mutex_unlock(&eptdev->ept_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* wake up any blocked readers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) wake_up_interruptible(&eptdev->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) cdev_device_del(&eptdev->cdev, &eptdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) put_device(&eptdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) void *priv, u32 addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct rpmsg_eptdev *eptdev = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) skb = alloc_skb(len, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) skb_put_data(skb, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) spin_lock(&eptdev->queue_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) skb_queue_tail(&eptdev->queue, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) spin_unlock(&eptdev->queue_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /* wake up any blocking processes, waiting for new data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) wake_up_interruptible(&eptdev->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static int rpmsg_eptdev_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct rpmsg_endpoint *ept;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct rpmsg_device *rpdev = eptdev->rpdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct device *dev = &eptdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) get_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!ept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) dev_err(dev, "failed to open %s\n", eptdev->chinfo.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) put_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) eptdev->ept = ept;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) filp->private_data = eptdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static int rpmsg_eptdev_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct device *dev = &eptdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) /* Close the endpoint, if it's not already destroyed by the parent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) mutex_lock(&eptdev->ept_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (eptdev->ept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) rpmsg_destroy_ept(eptdev->ept);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) eptdev->ept = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) mutex_unlock(&eptdev->ept_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* Discard all SKBs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) skb_queue_purge(&eptdev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) put_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static ssize_t rpmsg_eptdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct file *filp = iocb->ki_filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct rpmsg_eptdev *eptdev = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int use;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (!eptdev->ept)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return -EPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) spin_lock_irqsave(&eptdev->queue_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /* Wait for data in the queue */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (skb_queue_empty(&eptdev->queue)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) spin_unlock_irqrestore(&eptdev->queue_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (filp->f_flags & O_NONBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /* Wait until we get data or the endpoint goes away */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (wait_event_interruptible(eptdev->readq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) !skb_queue_empty(&eptdev->queue) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) !eptdev->ept))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /* We lost the endpoint while waiting */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (!eptdev->ept)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) return -EPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) spin_lock_irqsave(&eptdev->queue_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) skb = skb_dequeue(&eptdev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) spin_unlock_irqrestore(&eptdev->queue_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) use = min_t(size_t, iov_iter_count(to), skb->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (copy_to_iter(skb->data, use, to) != use)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) use = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return use;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static ssize_t rpmsg_eptdev_write_iter(struct kiocb *iocb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct iov_iter *from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) struct file *filp = iocb->ki_filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct rpmsg_eptdev *eptdev = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) size_t len = iov_iter_count(from);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) void *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) kbuf = kzalloc(len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (!kbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (!copy_from_iter_full(kbuf, len, from)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) goto free_kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (mutex_lock_interruptible(&eptdev->ept_lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ret = -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) goto free_kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (!eptdev->ept) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) ret = -EPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) goto unlock_eptdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (filp->f_flags & O_NONBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) ret = rpmsg_trysend(eptdev->ept, kbuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) ret = rpmsg_send(eptdev->ept, kbuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) unlock_eptdev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) mutex_unlock(&eptdev->ept_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) free_kbuf:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return ret < 0 ? ret : len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct rpmsg_eptdev *eptdev = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) __poll_t mask = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (!eptdev->ept)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return EPOLLERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) poll_wait(filp, &eptdev->readq, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (!skb_queue_empty(&eptdev->queue))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) mask |= EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) mask |= rpmsg_poll(eptdev->ept, filp, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) struct rpmsg_eptdev *eptdev = fp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (cmd != RPMSG_DESTROY_EPT_IOCTL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return rpmsg_eptdev_destroy(&eptdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static const struct file_operations rpmsg_eptdev_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) .open = rpmsg_eptdev_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) .release = rpmsg_eptdev_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) .read_iter = rpmsg_eptdev_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) .write_iter = rpmsg_eptdev_write_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) .poll = rpmsg_eptdev_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) .unlocked_ioctl = rpmsg_eptdev_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static ssize_t name_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) return sprintf(buf, "%s\n", eptdev->chinfo.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static DEVICE_ATTR_RO(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static ssize_t src_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return sprintf(buf, "%d\n", eptdev->chinfo.src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static DEVICE_ATTR_RO(src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) static ssize_t dst_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) return sprintf(buf, "%d\n", eptdev->chinfo.dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) static DEVICE_ATTR_RO(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) static struct attribute *rpmsg_eptdev_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) &dev_attr_name.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) &dev_attr_src.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) &dev_attr_dst.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) ATTRIBUTE_GROUPS(rpmsg_eptdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) static void rpmsg_eptdev_release_device(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) ida_simple_remove(&rpmsg_ept_ida, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) ida_simple_remove(&rpmsg_minor_ida, MINOR(eptdev->dev.devt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) kfree(eptdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct rpmsg_channel_info chinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) struct rpmsg_device *rpdev = ctrldev->rpdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) struct rpmsg_eptdev *eptdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (!eptdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) dev = &eptdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) eptdev->rpdev = rpdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) eptdev->chinfo = chinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) mutex_init(&eptdev->ept_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) spin_lock_init(&eptdev->queue_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) skb_queue_head_init(&eptdev->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) init_waitqueue_head(&eptdev->readq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) device_initialize(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) dev->class = rpmsg_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) dev->parent = &ctrldev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) dev->groups = rpmsg_eptdev_groups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) dev_set_drvdata(dev, eptdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) cdev_init(&eptdev->cdev, &rpmsg_eptdev_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) eptdev->cdev.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) goto free_eptdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) dev->devt = MKDEV(MAJOR(rpmsg_major), ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) ret = ida_simple_get(&rpmsg_ept_ida, 0, 0, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) goto free_minor_ida;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) dev->id = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) dev_set_name(dev, "rpmsg%d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) ret = cdev_device_add(&eptdev->cdev, &eptdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) goto free_ept_ida;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) /* We can now rely on the release function for cleanup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) dev->release = rpmsg_eptdev_release_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) free_ept_ida:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) ida_simple_remove(&rpmsg_ept_ida, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) free_minor_ida:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) free_eptdev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) put_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) kfree(eptdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) get_device(&ctrldev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) filp->private_data = ctrldev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) put_device(&ctrldev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct rpmsg_ctrldev *ctrldev = fp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct rpmsg_endpoint_info eptinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct rpmsg_channel_info chinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (cmd != RPMSG_CREATE_EPT_IOCTL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (copy_from_user(&eptinfo, argp, sizeof(eptinfo)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) chinfo.name[RPMSG_NAME_SIZE-1] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) chinfo.src = eptinfo.src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) chinfo.dst = eptinfo.dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) return rpmsg_eptdev_create(ctrldev, chinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) static const struct file_operations rpmsg_ctrldev_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) .open = rpmsg_ctrldev_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) .release = rpmsg_ctrldev_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) .unlocked_ioctl = rpmsg_ctrldev_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) static void rpmsg_ctrldev_release_device(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) ida_simple_remove(&rpmsg_ctrl_ida, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) kfree(ctrldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) struct rpmsg_ctrldev *ctrldev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (!ctrldev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) ctrldev->rpdev = rpdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) dev = &ctrldev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) device_initialize(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) dev->parent = &rpdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) dev->class = rpmsg_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) ctrldev->cdev.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) goto free_ctrldev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) dev->devt = MKDEV(MAJOR(rpmsg_major), ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) goto free_minor_ida;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) dev->id = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) ret = cdev_device_add(&ctrldev->cdev, &ctrldev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) goto free_ctrl_ida;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) /* We can now rely on the release function for cleanup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) dev->release = rpmsg_ctrldev_release_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) dev_set_drvdata(&rpdev->dev, ctrldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) free_ctrl_ida:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) ida_simple_remove(&rpmsg_ctrl_ida, dev->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) free_minor_ida:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) free_ctrldev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) put_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) kfree(ctrldev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) /* Destroy all endpoints */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_eptdev_destroy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) cdev_device_del(&ctrldev->cdev, &ctrldev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) put_device(&ctrldev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) static struct rpmsg_driver rpmsg_chrdev_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) .probe = rpmsg_chrdev_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) .remove = rpmsg_chrdev_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) .drv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) .name = "rpmsg_chrdev",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) static int rpmsg_char_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) pr_err("rpmsg: failed to allocate char dev region\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) rpmsg_class = class_create(THIS_MODULE, "rpmsg");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) if (IS_ERR(rpmsg_class)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) pr_err("failed to create rpmsg class\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) return PTR_ERR(rpmsg_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) ret = register_rpmsg_driver(&rpmsg_chrdev_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) pr_err("rpmsgchr: failed to register rpmsg driver\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) class_destroy(rpmsg_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) postcore_initcall(rpmsg_char_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) static void rpmsg_chrdev_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) unregister_rpmsg_driver(&rpmsg_chrdev_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) class_destroy(rpmsg_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) module_exit(rpmsg_chrdev_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) MODULE_ALIAS("rpmsg:rpmsg_chrdev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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