From 617d32938d1be0d67bad73a914635bf787c319c1 Mon Sep 17 00:00:00 2001 From: Arnaud Pouliquen Date: Mon, 24 Jan 2022 11:25:16 +0100 Subject: rpmsg: Move the rpmsg control device from rpmsg_char to rpmsg_ctrl Create the rpmsg_ctrl.c module and move the code related to the rpmsg_ctrldev device in this new module. Add the dependency between rpmsg_char and rpmsg_ctrl in the kconfig file: 1) RPMSG_CTRL can set as module or built-in if RPMSG=y || RPMSG_CHAR=y || RPMSG_CHAR=n 2) RPMSG_CTRL can not be set as built-in if RPMSG=m || RPMSG_CHAR=m Note that RPMGH_CHAR and RPMSG_CTRL can be activated separately. Therefore, the RPMSG_CTRL configuration must be set for backwards compatibility. Signed-off-by: Arnaud Pouliquen Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20220124102524.295783-4-arnaud.pouliquen@foss.st.com --- drivers/rpmsg/rpmsg_char.c | 160 +-------------------------------------------- 1 file changed, 2 insertions(+), 158 deletions(-) (limited to 'drivers/rpmsg/rpmsg_char.c') diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 0ca88935da8f..644b7d36707c 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -33,28 +33,12 @@ static dev_t rpmsg_major; -static DEFINE_IDA(rpmsg_ctrl_ida); static DEFINE_IDA(rpmsg_ept_ida); static DEFINE_IDA(rpmsg_minor_ida); #define dev_to_eptdev(dev) container_of(dev, struct rpmsg_eptdev, dev) #define cdev_to_eptdev(i_cdev) container_of(i_cdev, struct rpmsg_eptdev, cdev) -#define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev) -#define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev) - -/** - * struct rpmsg_ctrldev - control device for instantiating endpoint devices - * @rpdev: underlaying rpmsg device - * @cdev: cdev for the ctrl device - * @dev: device for the ctrl device - */ -struct rpmsg_ctrldev { - struct rpmsg_device *rpdev; - struct cdev cdev; - struct device dev; -}; - /** * struct rpmsg_eptdev - endpoint device context * @dev: endpoint device @@ -407,162 +391,22 @@ free_eptdev: } EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create); -static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp) -{ - struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); - - get_device(&ctrldev->dev); - filp->private_data = ctrldev; - - return 0; -} - -static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp) -{ - struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); - - put_device(&ctrldev->dev); - - return 0; -} - -static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, - unsigned long arg) -{ - struct rpmsg_ctrldev *ctrldev = fp->private_data; - void __user *argp = (void __user *)arg; - struct rpmsg_endpoint_info eptinfo; - struct rpmsg_channel_info chinfo; - - if (cmd != RPMSG_CREATE_EPT_IOCTL) - return -EINVAL; - - if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) - return -EFAULT; - - memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); - chinfo.name[RPMSG_NAME_SIZE-1] = '\0'; - chinfo.src = eptinfo.src; - chinfo.dst = eptinfo.dst; - - return rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo); -}; - -static const struct file_operations rpmsg_ctrldev_fops = { - .owner = THIS_MODULE, - .open = rpmsg_ctrldev_open, - .release = rpmsg_ctrldev_release, - .unlocked_ioctl = rpmsg_ctrldev_ioctl, - .compat_ioctl = compat_ptr_ioctl, -}; - -static void rpmsg_ctrldev_release_device(struct device *dev) -{ - struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev); - - ida_simple_remove(&rpmsg_ctrl_ida, dev->id); - ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); - kfree(ctrldev); -} - -static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) -{ - struct rpmsg_ctrldev *ctrldev; - struct device *dev; - int ret; - - ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); - if (!ctrldev) - return -ENOMEM; - - ctrldev->rpdev = rpdev; - - dev = &ctrldev->dev; - device_initialize(dev); - dev->parent = &rpdev->dev; - dev->class = rpmsg_class; - - cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); - ctrldev->cdev.owner = THIS_MODULE; - - ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); - if (ret < 0) - goto free_ctrldev; - dev->devt = MKDEV(MAJOR(rpmsg_major), ret); - - ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); - if (ret < 0) - goto free_minor_ida; - dev->id = ret; - dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); - - ret = cdev_device_add(&ctrldev->cdev, &ctrldev->dev); - if (ret) - goto free_ctrl_ida; - - /* We can now rely on the release function for cleanup */ - dev->release = rpmsg_ctrldev_release_device; - - dev_set_drvdata(&rpdev->dev, ctrldev); - - return ret; - -free_ctrl_ida: - ida_simple_remove(&rpmsg_ctrl_ida, dev->id); -free_minor_ida: - ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); -free_ctrldev: - put_device(dev); - kfree(ctrldev); - - return ret; -} - -static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) -{ - struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); - int ret; - - /* Destroy all endpoints */ - ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_eptdev_destroy); - if (ret) - dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); - - cdev_device_del(&ctrldev->cdev, &ctrldev->dev); - put_device(&ctrldev->dev); -} - -static struct rpmsg_driver rpmsg_chrdev_driver = { - .probe = rpmsg_chrdev_probe, - .remove = rpmsg_chrdev_remove, - .drv = { - .name = "rpmsg_chrdev", - }, -}; - static int rpmsg_chrdev_init(void) { int ret; - ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg"); + ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg_char"); if (ret < 0) { pr_err("failed to allocate char dev region\n"); return ret; } - ret = register_rpmsg_driver(&rpmsg_chrdev_driver); - if (ret < 0) { - pr_err("failed to register rpmsg driver\n"); - unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); - } - - return ret; + return 0; } postcore_initcall(rpmsg_chrdev_init); static void rpmsg_chrdev_exit(void) { - unregister_rpmsg_driver(&rpmsg_chrdev_driver); unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); } module_exit(rpmsg_chrdev_exit); -- cgit v1.2.3