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- /*
- * de_common.h
- */
- #include <linux/dma-buf.h>
- #include <linux/err.h>
- #include <linux/types.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/uaccess.h>
- #include <linux/version.h>
- #include <linux/miscdevice.h>
- #include "uapi/dmabuf_exporter.h"
- #include "de_heap.h"
- /*
- * Because this file is used in all modules, the kernel build system does
- * not define KBUILD_MODNAME. This causes a build failure in kernels where
- * dynamic debug is enabled, in all instances of pr_debug().
- *
- * dynamic debug messages for this file will use this name
- */
- #ifndef KBUILD_MODNAME
- #define KBUILD_MODNAME "dmabuf_exporter"
- #endif
- static struct miscdevice dmabuf_miscdevice;
- static int de_file_open(struct inode *inode, struct file *file)
- {
- pr_debug("%s\n", __func__);
- file->private_data = NULL;
- return 0;
- }
- static int dmabuf_ioctl_create(struct file *file, unsigned long arg_size)
- {
- void *private_data;
- size_t size;
- int ret;
- pr_debug("%s: private_data %p\n", __func__, file->private_data);
- size = (arg_size + PAGE_SIZE - 1) & (~(PAGE_SIZE - 1));
- pr_debug("%s: requested size %lu PAGE_SIZE %lu actual size %zu\n",
- __func__, arg_size, PAGE_SIZE, size);
- if (file->private_data) {
- pr_err("%s: buffer already created!\n", __func__);
- return -EBUSY;
- }
- ret = de_heap_buffer_create(size, PAGE_SIZE, &private_data);
- if (ret)
- return ret;
- file->private_data = private_data;
- return 0;
- }
- static int dmabuf_ioctl_export(struct file *file, unsigned long flags)
- {
- pr_debug("%s: private_data %p\n", __func__, file->private_data);
- if (file->private_data)
- return de_heap_export_fd(file->private_data, flags);
- pr_err("%s: buffer has not been created!\n", __func__);
- return -ENODEV;
- }
- static int de_file_release(struct inode *inode, struct file *file)
- {
- pr_debug("%s: private_data %p\n", __func__, file->private_data);
- if (file->private_data) {
- de_heap_buffer_free(file->private_data);
- file->private_data = NULL;
- }
- return 0;
- }
- static long de_file_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
- {
- pr_debug("%s: cmd %x arg %lx\n", __func__, cmd, arg);
- switch (cmd) {
- case DMABUF_IOCTL_CREATE:
- #ifdef CONFIG_COMPAT
- case COMPAT_DMABUF_IOCTL_CREATE:
- #endif
- return dmabuf_ioctl_create(file, arg);
- case DMABUF_IOCTL_EXPORT:
- #ifdef CONFIG_COMPAT
- case COMPAT_DMABUF_IOCTL_EXPORT:
- #endif
- return dmabuf_ioctl_export(file, arg);
- default:
- pr_err("%s: unknown cmd %x\n", __func__, cmd);
- return -ENOTTY;
- }
- }
- static const struct file_operations dmabuf_fops = {
- .owner = THIS_MODULE,
- .open = de_file_open,
- .release = de_file_release,
- .unlocked_ioctl = de_file_ioctl,
- #ifdef CONFIG_COMPAT
- .compat_ioctl = de_file_ioctl,
- #endif
- };
- static int __init dmabuf_device_init(void)
- {
- int ret;
- pr_info("%s\n", __func__);
- dmabuf_miscdevice.minor = 128;
- dmabuf_miscdevice.name = "dmabuf";
- dmabuf_miscdevice.fops = &dmabuf_fops;
- dmabuf_miscdevice.parent = NULL;
- dmabuf_miscdevice.mode = 0666;
- ret = misc_register(&dmabuf_miscdevice);
- if (ret < 0) {
- pr_err("%s: failed to register misc device %s\n",
- __func__, dmabuf_miscdevice.name);
- return ret;
- }
- pr_info("%s: registered misc device %s\n",
- __func__, dmabuf_miscdevice.name);
- ret = de_heap_heap_init();
- if (ret < 0) {
- misc_deregister(&dmabuf_miscdevice);
- return ret;
- }
- return 0;
- }
- static void __exit dmabuf_device_deinit(void)
- {
- pr_info("%s\n", __func__);
- de_heap_heap_deinit();
- misc_deregister(&dmabuf_miscdevice);
- }
- module_init(dmabuf_device_init);
- module_exit(dmabuf_device_deinit);
- MODULE_AUTHOR("GPL");
- MODULE_DESCRIPTION("DMA-BUF test driver");
- MODULE_LICENSE("GPL v2");
- /*
- * coding style for emacs
- *
- * Local variables:
- * indent-tabs-mode: t
- * tab-width: 8
- * c-basic-offset: 8
- * End:
- */
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