From 9eb310afc4a96304b47d4897c58ca3bb733362a9 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Sun, 27 May 2018 14:46:02 +0200
Subject: Add missing draw columns features

---
 char.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 88 insertions(+), 1 deletion(-)

(limited to 'char.c')

diff --git a/char.c b/char.c
index b1c52ec..bb70d1b 100644
--- a/char.c
+++ b/char.c
@@ -251,9 +251,96 @@ error_data:
 	return err;
 }
 
+void free_colors(struct colors_data *colors_data);
+int colors_release(struct inode *inode, struct file *filp)
+{
+	struct colors_data *colors_data;
+
+	colors_data = filp->private_data;
+
+	free_colors(colors_data);
+
+	kfree(colors_data);
+
+	return 0;
+}
+
+struct file_operations colors_fops = {
+	.owner = THIS_MODULE,
+	.release = colors_release
+
+};
+
+int alloc_colors(struct doomdev_ioctl_create_colormaps *params,
+		struct colors_data *colors_data)
+{
+	int err;
+	int not_written;
+
+	colors_data->number = params->num;
+
+	colors_data->colors_cpu =
+		dma_alloc_coherent(colors_data->doom_data->pci_device,
+				HARDDOOM_COLORMAP_SIZE * params->num,
+				&colors_data->colors_dev,
+				GFP_KERNEL);
+	ORFAIL_NULL(colors_data->colors_cpu, -ENOMEM, error_colors);
+
+	not_written = copy_from_user(colors_data->colors_cpu,
+			(void __user *) params->data_ptr,
+			HARDDOOM_COLORMAP_SIZE * params->num);
+
+	if (not_written) {
+		err = -EFAULT;
+		goto error_copy;
+	}
+
+	return 0;
+
+error_copy:
+	dma_free_coherent(colors_data->doom_data->pci_device,
+			HARDDOOM_COLORMAP_SIZE * params->num,
+			colors_data->colors_cpu, colors_data->colors_dev);
+error_colors:
+	return err;
+
+}
+
+void free_colors(struct colors_data *colors_data)
+{
+	dma_free_coherent(colors_data->doom_data->pci_device,
+			HARDDOOM_COLORMAP_SIZE * colors_data->number,
+			colors_data->colors_cpu, colors_data->colors_dev);
+}
+
 long doom_create_colormaps(struct file *filp, unsigned long arg)
 {
-	return -1;
+	int err;
+	struct doomdev_ioctl_create_colormaps *params;
+	struct colors_data *colors_data;
+	int fd;
+	struct doom_data *doom_data;
+
+	params = (struct doomdev_ioctl_create_colormaps *) arg;
+
+	colors_data = kmalloc(sizeof(*colors_data), GFP_KERNEL);
+	ORFAIL_NULL(colors_data, -ENOMEM, error_data);
+	doom_data = container_of(filp->f_inode->i_cdev, struct doom_data, cdev);
+	colors_data->doom_data = doom_data;
+
+	ORFAIL(alloc_colors(params, colors_data), error_colors);
+
+	fd = anon_inode_getfd("doom_colors", &colors_fops, colors_data, 0);
+	ORFAIL(fd, error_inode);
+
+	return fd;
+
+error_inode:
+	free_colors(colors_data);
+error_colors:
+	kfree(colors_data);
+error_data:
+	return err;
 }
 
 long doom_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-- 
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