148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/*
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* dependencies:
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*
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* libusb-dev
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#define CH349_VENDOR_ID 0x1a86
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#define CH349_PRODUCT_ID 0xe349
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struct ch349_device {
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struct usb_device *udev;
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struct usb_interface *interface;
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struct mutex io_mutex;
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__u8 bulk_in_endpointAddr;
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__u8 bulk_out_endpointAddr;
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size_t bulk_in_size;
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unsigned char *bulk_in_buffer;
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};
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static const struct usb_device_id ch349_table[] = {
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{ USB_DEVICE(CH349_VENDOR_ID, CH349_PRODUCT_ID) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, ch349_table);
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static int ch349_probe(struct usb_interface *interface,
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const struct usb_device_id *id)
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{
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struct ch349_device *dev;
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struct usb_endpoint_descriptor *endpoint;
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size_t buffer_size;
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int i;
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int retval = -ENOMEM;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev) {
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dev_err(&interface->dev, "Out of memory\n");
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goto error;
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}
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mutex_init(&dev->io_mutex);
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dev->udev = usb_get_dev(interface_to_usbdev(interface));
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dev->interface = interface;
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for (i = 0; i < interface->cur_altsetting->desc.bNumEndpoints; i++) {
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endpoint = &interface->cur_altsetting->endpoint[i].desc;
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if (!dev->bulk_in_endpointAddr &&
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usb_endpoint_is_bulk_in(endpoint)) {
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buffer_size = usb_endpoint_maxp(endpoint);
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dev->bulk_in_size = buffer_size;
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dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
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dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
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if (!dev->bulk_in_buffer) {
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dev_err(&interface->dev,
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"Could not allocate bulk_in_buffer\n");
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goto error;
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}
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}
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if (!dev->bulk_out_endpointAddr &&
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usb_endpoint_is_bulk_out(endpoint)) {
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dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
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}
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}
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if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
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dev_err(&interface->dev,
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"Could not find both bulk-in and bulk-out endpoints\n");
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goto error;
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}
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usb_set_intfdata(interface, dev);
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dev_info(&interface->dev,
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"CH349 device now attached\n");
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return 0;
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error:
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if (dev)
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kfree(dev->bulk_in_buffer);
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kfree(dev);
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return retval;
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}
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static void ch349_disconnect(struct usb_interface *interface)
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{
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struct ch349_device *dev;
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dev = usb_get_intfdata(interface);
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usb_set_intfdata(interface, NULL);
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kfree(dev->bulk_in_buffer);
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usb_put_dev(dev->udev);
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kfree(dev);
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dev_info(&interface->dev, "CH349 device now disconnected\n");
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}
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static int ch349_suspend(struct usb_interface *intf, pm_message_t message)
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{
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struct ch349_device *dev = usb_get_intfdata(intf);
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if (!dev)
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return 0;
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mutex_lock(&dev->io_mutex);
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mutex_unlock(&dev->io_mutex);
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return 0;
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}
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static int ch349_resume(struct usb_interface *intf)
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{
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struct ch349_device *dev = usb_get_intfdata(intf);
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if (!dev)
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return 0;
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return 0;
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}
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static struct usb_driver ch349_driver = {
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.name = "ch349",
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.probe = ch349_probe,
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.disconnect = ch349_disconnect,
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.suspend = ch349_suspend,
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.resume = ch349_resume,
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.id_table = ch349_table,
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.supports_autosuspend = 1,
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};
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module_usb_driver(ch349_driver);
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MODULE_AUTHOR("Votre Nom");
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MODULE_DESCRIPTION("Driver USB pour CH349A");
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MODULE_LICENSE("GPL");
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