From 911ab1a4ad24fb3c4f6df5c4798a8f2656c09af7 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Sat, 26 May 2018 20:58:24 +0200
Subject: Implement flat textures

---
 char.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

diff --git a/char.c b/char.c
index 54fd8a3..c1c4f16 100644
--- a/char.c
+++ b/char.c
@@ -166,9 +166,91 @@ error_data:
 	return err;
 }
 
+void free_flat(struct flat_data *flat_data);
+int flat_release(struct inode *inode, struct file *filp)
+{
+	struct flat_data *flat_data;
+
+	flat_data = filp->private_data;
+
+	free_flat(flat_data);
+
+	kfree(flat_data);
+
+	return 0;
+}
+
+struct file_operations flat_fops = {
+	.owner = THIS_MODULE,
+	.release = flat_release
+
+};
+
+int alloc_flat(struct doomdev_ioctl_create_flat *params,
+		struct flat_data *flat_data)
+{
+	int err;
+	int not_written;
+
+	flat_data->flat_cpu =
+		dma_alloc_coherent(flat_data->doom_data->pci_device,
+				HARDDOOM_FLAT_SIZE, &flat_data->flat_dev,
+				GFP_KERNEL);
+	ORFAIL_NULL(flat_data->flat_cpu, -ENOMEM, error_flat);
+
+	not_written = copy_from_user(flat_data->flat_cpu,
+			(void __user *) params->data_ptr, HARDDOOM_FLAT_SIZE);
+
+	if (not_written) {
+		p("some bytes not copied\n");
+		err = -EFAULT;
+		goto error_copy;
+	}
+
+	return 0;
+
+error_copy:
+	dma_free_coherent(flat_data->doom_data->pci_device, HARDDOOM_FLAT_SIZE,
+			flat_data->flat_cpu, flat_data->flat_dev);
+error_flat:
+	return err;
+
+}
+
+void free_flat(struct flat_data *flat_data)
+{
+	dma_free_coherent(flat_data->doom_data->pci_device, HARDDOOM_FLAT_SIZE,
+			flat_data->flat_cpu, flat_data->flat_dev);
+}
+
 long doom_create_flat(struct file *filp, unsigned long arg)
 {
-	return -1;
+	int err;
+	struct doomdev_ioctl_create_flat *params;
+	struct flat_data *flat_data;
+	int fd;
+	struct doom_data *doom_data;
+
+	params = (struct doomdev_ioctl_create_flat *) arg;
+
+	flat_data = kmalloc(sizeof(*flat_data), GFP_KERNEL);
+	ORFAIL_NULL(flat_data, -ENOMEM, error_data);
+	doom_data = container_of(filp->f_inode->i_cdev, struct doom_data, cdev);
+	flat_data->doom_data = doom_data;
+	
+	ORFAIL(alloc_flat(params, flat_data), error_flat);
+
+	fd = anon_inode_getfd("doom_texture", &flat_fops, flat_data, 0);
+	ORFAIL(fd, error_inode);
+
+	return fd;
+
+error_inode:
+	free_flat(flat_data);
+error_flat:
+	kfree(flat_data);
+error_data:
+	return err;
 }
 
 long doom_create_colormaps(struct file *filp, unsigned long arg)
-- 
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