On Thu, Mar 31, 2022 at 09:33:04PM -0500, frank zago wrote:
> The CH341 is a multifunction chip, presenting 3 different USB PID. One
> of these functions is for I2C/SPI/GPIO. This new set of drivers will
> manage I2C and GPIO.
>
> Signed-off-by: frank zago <frank@xxxxxxxx>
> ---
> +static int ch341_usb_probe(struct usb_interface *iface,
> + const struct usb_device_id *usb_id)
> +{
> + struct usb_host_endpoint *endpoints;
> + struct ch341_device *dev;
> + int rc;
> +
> + dev = devm_kzalloc(&iface->dev, sizeof(*dev), GFP_KERNEL);
> + if (!dev)
> + return -ENOMEM;
> +
> + dev->usb_dev = usb_get_dev(interface_to_usbdev(iface));
No need to grab a reference unless you're going to hold on to it past
disconnect().
> + dev->iface = iface;
> + mutex_init(&dev->usb_lock);
> +
> + if (iface->cur_altsetting->desc.bNumEndpoints != 3) {
> + rc = -ENODEV;
> + goto free_dev;
> + }
> +
> + endpoints = iface->cur_altsetting->endpoint;
> + if (!usb_endpoint_is_bulk_in(&endpoints[0].desc) ||
> + !usb_endpoint_is_bulk_out(&endpoints[1].desc) ||
> + !usb_endpoint_xfer_int(&endpoints[2].desc)) {
> + rc = -ENODEV;
> + goto free_dev;
> + }
Please use usb_find_common_endpoints() for the above.
> +
> + dev->ep_in = endpoints[0].desc.bEndpointAddress;
> + dev->ep_out = endpoints[1].desc.bEndpointAddress;
> + dev->ep_intr = endpoints[2].desc.bEndpointAddress;
> + dev->ep_intr_interval = endpoints[2].desc.bInterval;
> +
> + usb_set_intfdata(iface, dev);
> +
> + rc = mfd_add_hotplug_devices(&iface->dev, ch341_devs,
> + ARRAY_SIZE(ch341_devs));
> + if (rc) {
> + rc = dev_err_probe(&iface->dev, rc,
> + "Failed to add mfd devices to core\n");
> + goto free_dev;
> + }
> +
> + return 0;
> +
> +free_dev:
> + usb_put_dev(dev->usb_dev);
> +
> + return rc;
> +}
> +
> +static void ch341_usb_disconnect(struct usb_interface *usb_if)
> +{
> + struct ch341_device *dev = usb_get_intfdata(usb_if);
> +
> + mfd_remove_devices(&usb_if->dev);
> + usb_put_dev(dev->usb_dev);
> +}
Johan
