// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Copyright (c) 2022 Rockchip Electronics Co., Ltd
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*
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* Due to hardware limitations, this module only supports
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* up to 32bit continuous CMA memory.
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*
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* author:
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* Xiao Yapeng, yp.xiao@rock-chips.com
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* mender:
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* Lin Jinhan, troy.lin@rock-chips.com
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*/
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#include <linux/dma-buf.h>
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#include <linux/dma-direct.h>
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#include <linux/dma-mapping.h>
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#include <linux/fs.h>
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#include <linux/ioctl.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/soc/rockchip/rockchip_decompress.h>
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#include <uapi/linux/rk-decom.h>
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#define RK_DECOME_TIMEOUT 3 /* 3 seconds */
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struct rk_decom_dev {
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struct miscdevice miscdev;
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struct device *dev;
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struct mutex mutex;
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};
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static long rk_decom_misc_ioctl(struct file *fptr, unsigned int cmd, unsigned long arg);
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static const struct file_operations rk_decom_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = rk_decom_misc_ioctl,
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};
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static struct rk_decom_dev g_rk_decom = {
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.miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = RK_DECOM_NAME,
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.fops = &rk_decom_fops,
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},
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};
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static bool check_scatter_list(unsigned int max_size, struct sg_table *sg_tbl)
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{
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int i;
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unsigned int total_len = 0;
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dma_addr_t next_addr = 0;
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struct scatterlist *sgl = NULL;
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if (!sg_tbl || !(sg_tbl->sgl))
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return false;
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for_each_sgtable_sg(sg_tbl, sgl, i) {
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if (sg_phys(sgl) > SZ_4G || sg_phys(sgl) + sg_dma_len(sgl) > SZ_4G)
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return false;
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if (i && next_addr != sg_dma_address(sgl))
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return false;
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total_len += sg_dma_len(sgl);
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next_addr = sg_dma_address(sgl) + sg_dma_len(sgl);
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}
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return max_size <= total_len;
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}
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static int get_dmafd_sgtbl(struct device *dev, int dma_fd, enum dma_data_direction dir,
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struct sg_table **sg_tbl, struct dma_buf_attachment **dma_attach,
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struct dma_buf **dmabuf)
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{
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int ret = -EINVAL;
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if (!dev)
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return -EINVAL;
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*sg_tbl = NULL;
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*dmabuf = NULL;
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*dma_attach = NULL;
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*dmabuf = dma_buf_get(dma_fd);
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if (IS_ERR(*dmabuf)) {
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ret = PTR_ERR(*dmabuf);
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goto error;
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}
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*dma_attach = dma_buf_attach(*dmabuf, dev);
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if (IS_ERR(*dma_attach)) {
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ret = PTR_ERR(*dma_attach);
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goto error;
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}
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*sg_tbl = dma_buf_map_attachment(*dma_attach, dir);
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if (IS_ERR(*sg_tbl)) {
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ret = PTR_ERR(*sg_tbl);
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goto error;
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}
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return 0;
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error:
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if (*sg_tbl)
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dma_buf_unmap_attachment(*dma_attach, *sg_tbl, dir);
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if (*dma_attach)
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dma_buf_detach(*dmabuf, *dma_attach);
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if (*dmabuf)
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dma_buf_put(*dmabuf);
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*sg_tbl = NULL;
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*dmabuf = NULL;
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*dma_attach = NULL;
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return ret;
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}
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static int put_dmafd_sgtbl(struct device *dev, int dma_fd, enum dma_data_direction dir,
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struct sg_table *sg_tbl, struct dma_buf_attachment *dma_attach,
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struct dma_buf *dmabuf)
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{
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if (!dev)
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return -EINVAL;
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if (!sg_tbl || !dma_attach || !dmabuf)
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return -EINVAL;
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dma_buf_unmap_attachment(dma_attach, sg_tbl, dir);
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dma_buf_detach(dmabuf, dma_attach);
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dma_buf_put(dmabuf);
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return 0;
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}
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static int rk_decom_for_user(struct device *dev, struct rk_decom_param *param)
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{
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int ret;
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struct sg_table *sg_tbl_in = NULL, *sg_tbl_out = NULL;
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struct dma_buf *dma_buf_in = NULL, *dma_buf_out = NULL;
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struct dma_buf_attachment *dma_attach_in = NULL, *dma_attach_out = NULL;
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if (param->mode != RK_GZIP_MOD && param->mode != RK_ZLIB_MOD) {
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dev_err(dev, "unsupported mode %u for decompress.\n", param->mode);
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return -EINVAL;
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}
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ret = get_dmafd_sgtbl(dev, param->src_fd, DMA_TO_DEVICE,
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&sg_tbl_in, &dma_attach_in, &dma_buf_in);
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if (unlikely(ret)) {
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dev_err(dev, "src_fd[%d] get_dmafd_sgtbl error.", (int)param->src_fd);
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goto exit;
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}
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ret = get_dmafd_sgtbl(dev, param->dst_fd, DMA_FROM_DEVICE,
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&sg_tbl_out, &dma_attach_out, &dma_buf_out);
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if (unlikely(ret)) {
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dev_err(dev, "dst_fd[%d] get_dmafd_sgtbl error.", (int)param->dst_fd);
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goto exit;
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}
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if (!check_scatter_list(0, sg_tbl_in)) {
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dev_err(dev, "Input dma_fd not a continuous buffer.\n");
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ret = -EINVAL;
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goto exit;
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}
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if (!check_scatter_list(param->dst_max_size, sg_tbl_out)) {
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dev_err(dev, "Output dma_fd not a continuous buffer or dst_max_size too big.\n");
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ret = -EINVAL;
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goto exit;
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}
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ret = rk_decom_start(param->mode | DECOM_NOBLOCKING, sg_dma_address(sg_tbl_in->sgl),
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sg_dma_address(sg_tbl_out->sgl), param->dst_max_size);
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if (ret) {
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dev_err(dev, "rk_decom_start failed[%d].", ret);
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goto exit;
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}
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ret = rk_decom_wait_done(RK_DECOME_TIMEOUT, ¶m->decom_data_len);
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exit:
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if (sg_tbl_in && dma_buf_in && dma_attach_in)
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put_dmafd_sgtbl(dev, param->src_fd, DMA_TO_DEVICE,
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sg_tbl_in, dma_attach_in, dma_buf_in);
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if (sg_tbl_out && dma_buf_out && dma_attach_out)
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put_dmafd_sgtbl(dev, param->dst_fd, DMA_FROM_DEVICE,
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sg_tbl_out, dma_attach_out, dma_buf_out);
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return ret;
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}
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static long rk_decom_misc_ioctl(struct file *fptr, unsigned int cmd, unsigned long arg)
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{
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struct rk_decom_param param;
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struct rk_decom_dev *rk_decom = NULL;
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int ret = -EINVAL;
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rk_decom = container_of(fptr->private_data, struct rk_decom_dev, miscdev);
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mutex_lock(&rk_decom->mutex);
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switch (cmd) {
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case RK_DECOM_USER: {
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ret = copy_from_user((char *)¶m, (char *)arg, sizeof(param));
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if (unlikely(ret)) {
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ret = -EFAULT;
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dev_err(rk_decom->dev, "copy from user fail.\n");
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goto exit;
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}
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ret = rk_decom_for_user(rk_decom->dev, ¶m);
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if (copy_to_user((char *)arg, ¶m, sizeof(param))) {
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dev_err(rk_decom->dev, " copy to user fail.\n");
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ret = -EFAULT;
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goto exit;
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}
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break;
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}
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default:
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ret = -EINVAL;
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break;
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}
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exit:
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mutex_unlock(&rk_decom->mutex);
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return ret;
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}
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static int __init rk_decom_misc_init(void)
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{
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int ret;
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struct rk_decom_dev *rk_decom = &g_rk_decom;
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struct miscdevice *misc = &g_rk_decom.miscdev;
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ret = misc_register(misc);
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if (ret < 0) {
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pr_err("rk_decom: misc device %s register failed[%d].\n", RK_DECOM_NAME, ret);
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goto error;
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}
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rk_decom->dev = misc->this_device;
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/* Save driver private data */
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dev_set_drvdata(rk_decom->dev, rk_decom);
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ret = dma_coerce_mask_and_coherent(misc->this_device, DMA_BIT_MASK(32));
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if (ret) {
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dev_err(rk_decom->dev, "No suitable DMA available.\n");
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goto error;
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}
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mutex_init(&rk_decom->mutex);
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dev_info(rk_decom->dev, "misc device %s register success.\n", RK_DECOM_NAME);
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return 0;
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error:
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if (rk_decom->dev)
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misc_deregister(&rk_decom->miscdev);
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return ret;
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}
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static void __exit rk_decom_misc_exit(void)
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{
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misc_deregister(&g_rk_decom.miscdev);
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}
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module_init(rk_decom_misc_init)
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module_exit(rk_decom_misc_exit)
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MODULE_LICENSE("Dual MIT/GPL");
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MODULE_VERSION("1.0.0");
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MODULE_AUTHOR("Xiao Yapeng yp.xiao@rock-chips.com");
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MODULE_DESCRIPTION("Rockchip decom driver");
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