structure and first prototype link successful

2026-02-05 17:03:52 +01:00
parent a1ff7c701e
commit 4be86baf85
11 changed files with 1395 additions and 156 deletions
--- a/src/ch349_driver.c
+++ b/src/ch349_driver.c
@@ -0,0 +1,176 @@
+/*
+ * dependencies:
+ *
+ * libusb-dev
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+
+#define CH349_VENDOR_ID 0x1a86
+#define CH349_PRODUCT_ID 0x5397
+
+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_AND_INTERFACE_INFO(CH349_VENDOR_ID, CH349_PRODUCT_ID,
+					USB_CLASS_CDC_DATA, 0, 0) },
+	{}
+};
+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_info(&interface->dev, "Probing CH349 device\n");
+
+	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;
+
+	retval = usb_set_interface(
+		dev->udev, interface->cur_altsetting->desc.bInterfaceNumber, 1);
+	if (retval) {
+		dev_err(&interface->dev, "Cannot set altsetting 1: %d\n",
+			retval);
+		goto error;
+	}
+
+	dev_info(&interface->dev, "Interface obtained\n");
+
+	if (dev->udev->actconfig->desc.bConfigurationValue != 2) {
+		retval = usb_set_configuration(dev->udev, 2);
+		if (retval) {
+			dev_err(&interface->dev,
+				"Cannot set configuration 2\n");
+			goto error;
+		}
+	}
+
+	for (i = 0; i < interface->cur_altsetting->desc.bNumEndpoints; i++) {
+		endpoint = &interface->cur_altsetting->endpoint[i].desc;
+
+		dev_info(&interface->dev, "Found endpoint 0x%02x\n",
+			 endpoint->bEndpointAddress); // Debugging line
+
+		if (!dev->bulk_in_endpointAddr &&
+		    usb_endpoint_is_bulk_in(endpoint)) {
+			dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
+			dev->bulk_in_size = usb_endpoint_maxp(endpoint);
+			dev->bulk_in_buffer =
+				kmalloc(dev->bulk_in_size, GFP_KERNEL);
+			if (!dev->bulk_in_buffer) {
+				dev_err(&interface->dev,
+					"Could not allocate bulk_in_buffer\n");
+				goto error;
+			}
+			dev_info(&interface->dev,
+				 "Bulk IN endpoint found: 0x%02x\n",
+				 dev->bulk_in_endpointAddr);
+		}
+
+		if (!dev->bulk_out_endpointAddr &&
+		    usb_endpoint_is_bulk_out(endpoint)) {
+			dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
+			dev_info(&interface->dev,
+				 "Bulk OUT endpoint found: 0x%02x\n",
+				 dev->bulk_out_endpointAddr);
+		}
+	}
+
+	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("bob industries");
+MODULE_DESCRIPTION("Driver USB pour CH349A");
+MODULE_LICENSE("GPL");