[Title] added virtio touchscreen skeleton driver

[Type] feature
[Module] Emulator / touch
[Priority] marjo
[Jira#]
[Redmine#]
[Problem]
[Cause]
[Solution]
[TestCase]

diff --git a/drivers/maru/maru_virtio_touchscreen.c b/drivers/maru/maru_virtio_touchscreen.c
new file mode 100644 (file)
index 0000000..822e2b0
--- /dev/null
+++ b/drivers/maru/maru_virtio_touchscreen.c
@@ -0,0 +1,167 @@
+/*
+ * Maru Virtual Virtio Touchscreen device driver
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd. All rights reserved.
+ *
+ * Contact: 
+ *  GiWoong Kim <giwoong.kim@samsung.com>
+ *  SeokYeon Hwang <syeon.hwang@samsung.com>
+ *  YeongKyoon Lee <yeongkyoon.lee@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Contributors:
+ * - S-Core Co., Ltd
+ *
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+//#include <linux/pci.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+
+
+#define DEVICE_NAME "virtio-touchscreen"
+
+/* This structure must match the qemu definitions */
+typedef struct EmulTouchState {
+    uint16_t x, y, z;
+    uint8_t state;
+} EmulTouchState;
+
+
+static struct virtqueue *vq = NULL;
+
+static struct virtio_device_id id_table[] = {
+    { VIRTIO_ID_TOUCHSCREEN, VIRTIO_DEV_ANY_ID },
+    { 0 },
+};
+
+static void vq_touchscreen_callback(struct virtqueue *vq)
+{
+    printk(KERN_INFO "vq touchscreen callback\n");
+}
+
+static int virtio_touchscreen_open(struct inode *inode, struct file *file)
+{
+    printk(KERN_INFO "virtio touchscreen device is opened\n");
+    return 0;
+}
+
+static int virtio_touchscreen_release(struct inode *inode, struct file *file)
+{
+    printk(KERN_INFO "virtio touchscreen device is closed\n");
+    return 0;
+}
+
+struct file_operations virtio_touchscreen_fops = {
+    .owner      = THIS_MODULE,
+    .write      = NULL,
+    .mmap       = NULL,
+    .open       = virtio_touchscreen_open,
+    .release    = virtio_touchscreen_release,
+};
+
+static struct miscdevice virtio_touchscreen_dev = {
+    .minor = MISC_DYNAMIC_MINOR,
+    .name = DEVICE_NAME,
+    .fops = &virtio_touchscreen_fops,
+};
+
+static int virtio_touchscreen_probe(struct virtio_device *vdev)
+{
+    int ret = 0;
+
+    printk(KERN_INFO "virtio touchscreen driver is probed.\n");
+
+    vq = virtio_find_single_vq(vdev, NULL, "virtio-touchscreen-vq");
+    if (IS_ERR(vq)) {
+        return PTR_ERR(vq);
+    }
+
+    ret = misc_register(&virtio_touchscreen_dev);
+    if (ret) {
+        printk(KERN_ERR "virtio touchscreen cannot register device as misc\n");
+        return -ENODEV;
+    }
+
+
+    // temp
+    vq->callback = vq_touchscreen_callback;
+
+    /* Transfer data */
+#if 0
+    if (virtqueue_add_buf(vq, sg_list, out_page, in_page, (void*)1, GFP_ATOMIC) >= 0) {
+        while (!virtqueue_get_buf(vq, &count)) {
+            cpu_relax();
+        }
+    }
+#endif
+
+    return 0;
+}
+
+static void __devexit virtio_touchscreen_remove(struct virtio_device *vdev)
+{
+    printk(KERN_INFO "virtio touchscreen driver is removed.\n");
+
+    vdev->config->reset(vdev); // reset device
+    misc_deregister(&virtio_touchscreen_dev);
+    vdev->config->del_vqs(vdev); // clean up the queues
+}
+
+static struct virtio_driver virtio_touchscreen_driver = {
+    //.feature_table = features,
+    //.feature_table_size = ARRAY_SIZE(features),
+    .driver.name = KBUILD_MODNAME,
+    .driver.owner = THIS_MODULE,
+    .id_table = id_table,
+    .probe = virtio_touchscreen_probe,
+    .remove = virtio_touchscreen_remove,
+#if 0
+    .config_changed = virtballoon_changed,
+#ifdef CONFIG_PM
+    .freeze =   
+    .restore =
+#endif
+#endif
+};
+
+static int __init virtio_touchscreen_init(void)
+{
+    printk(KERN_INFO "virtio touchscreen device is initialized.\n");
+    return register_virtio_driver(&virtio_touchscreen_driver);
+}
+
+static void __exit virtio_touchscreen_exit(void)
+{
+    printk(KERN_INFO "virtio touchscreen device is destroyed.\n");
+    unregister_virtio_driver(&virtio_touchscreen_driver);
+}
+
+module_init(virtio_touchscreen_init);
+module_exit(virtio_touchscreen_exit);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_AUTHOR("GiWoong Kim <giwoong.kim@samsung.com>");
+MODULE_DESCRIPTION("Emulator Virtio Touchscreen driver");
+MODULE_LICENSE("GPL2");

diff --git a/include/linux/virtio_ids.h b/include/linux/virtio_ids.h
index a2d629476dfca1d14b5f769afc285310d516e351..76c8f87c77db4b470b81e4295f5b7bb3f037940f 100644 (file)
--- a/include/linux/virtio_ids.h
+++ b/include/linux/virtio_ids.h
@@ -39,4 +39,7 @@
 #define VIRTIO_ID_SCSI         8 /* virtio scsi */
 #define VIRTIO_ID_9P           9 /* 9p virtio console */
 
+/* Maru devices */
+#define VIRTIO_ID_TOUCHSCREEN 10 /* virtio touchscreen */
+
 #endif /* _LINUX_VIRTIO_IDS_H */