From 5e4a3b642d15d34f354acfc27b9b8b2f2a7f29cc Mon Sep 17 00:00:00 2001
From: TIBERGHIEN corentin <corentin.tiberghien3@gmail.com>
Date: Tue, 3 Feb 2026 10:33:52 +0100
Subject: [PATCH] driver base

---
 Makefile |   7 +++
 driver.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 Makefile
 create mode 100644 driver.c

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c9498e9
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,7 @@
+obj-m += driver.o
+
+all:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+clean:
+	make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
diff --git a/driver.c b/driver.c
new file mode 100644
index 0000000..1814b15
--- /dev/null
+++ b/driver.c
@@ -0,0 +1,147 @@
+/*
+ * dependencies:
+ *
+ * libusb-dev
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+
+#define CH349_VENDOR_ID  0x1a86
+#define CH349_PRODUCT_ID 0xe349
+
+struct ch349_device {
+    struct usb_device *udev;
+    struct usb_interface *interface;
+    struct mutex io_mutex;
+    
+    __u8 bulk_in_endpointAddr;
+    __u8 bulk_out_endpointAddr;
+    size_t bulk_in_size;
+    unsigned char *bulk_in_buffer;
+};
+
+static const struct usb_device_id ch349_table[] = {
+    { USB_DEVICE(CH349_VENDOR_ID, CH349_PRODUCT_ID) },
+    { } 
+};
+MODULE_DEVICE_TABLE(usb, ch349_table);
+
+static int ch349_probe(struct usb_interface *interface,
+                       const struct usb_device_id *id)
+{
+    struct ch349_device *dev;
+    struct usb_endpoint_descriptor *endpoint;
+    size_t buffer_size;
+    int i;
+    int retval = -ENOMEM;
+
+    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+    if (!dev) {
+        dev_err(&interface->dev, "Out of memory\n");
+        goto error;
+    }
+
+    mutex_init(&dev->io_mutex);
+    dev->udev = usb_get_dev(interface_to_usbdev(interface));
+    dev->interface = interface;
+
+    for (i = 0; i < interface->cur_altsetting->desc.bNumEndpoints; i++) {
+        endpoint = &interface->cur_altsetting->endpoint[i].desc;
+
+        if (!dev->bulk_in_endpointAddr &&
+            usb_endpoint_is_bulk_in(endpoint)) {
+            buffer_size = usb_endpoint_maxp(endpoint);
+            dev->bulk_in_size = buffer_size;
+            dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
+            dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
+            if (!dev->bulk_in_buffer) {
+                dev_err(&interface->dev,
+                        "Could not allocate bulk_in_buffer\n");
+                goto error;
+            }
+        }
+
+        if (!dev->bulk_out_endpointAddr &&
+            usb_endpoint_is_bulk_out(endpoint)) {
+            dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
+        }
+    }
+
+    if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
+        dev_err(&interface->dev,
+                "Could not find both bulk-in and bulk-out endpoints\n");
+        goto error;
+    }
+
+    usb_set_intfdata(interface, dev);
+
+    dev_info(&interface->dev,
+             "CH349 device now attached\n");
+
+    return 0;
+
+error:
+    if (dev)
+        kfree(dev->bulk_in_buffer);
+    kfree(dev);
+    return retval;
+}
+
+static void ch349_disconnect(struct usb_interface *interface)
+{
+    struct ch349_device *dev;
+
+    dev = usb_get_intfdata(interface);
+    usb_set_intfdata(interface, NULL);
+
+    kfree(dev->bulk_in_buffer);
+    usb_put_dev(dev->udev);
+    kfree(dev);
+
+    dev_info(&interface->dev, "CH349 device now disconnected\n");
+}
+
+static int ch349_suspend(struct usb_interface *intf, pm_message_t message)
+{
+    struct ch349_device *dev = usb_get_intfdata(intf);
+    
+    if (!dev)
+        return 0;
+    
+    mutex_lock(&dev->io_mutex);
+    mutex_unlock(&dev->io_mutex);
+    
+    return 0;
+}
+
+static int ch349_resume(struct usb_interface *intf)
+{
+    struct ch349_device *dev = usb_get_intfdata(intf);
+    
+    if (!dev)
+        return 0;
+    
+    
+    return 0;
+}
+
+static struct usb_driver ch349_driver = {
+    .name        = "ch349",
+    .probe       = ch349_probe,
+    .disconnect  = ch349_disconnect,
+    .suspend     = ch349_suspend,
+    .resume      = ch349_resume,
+    .id_table    = ch349_table,
+    .supports_autosuspend = 1,
+};
+
+module_usb_driver(ch349_driver);
+
+MODULE_AUTHOR("Votre Nom");
+MODULE_DESCRIPTION("Driver USB pour CH349A");
+MODULE_LICENSE("GPL");