change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/drivers/usb/misc/trancevibrator.c
..
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@@ -46,7 +46,9 @@
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 	struct trancevibrator *tv = usb_get_intfdata(intf);
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 	int temp, retval, old;
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-	temp = simple_strtoul(buf, NULL, 10);
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+	retval = kstrtoint(buf, 10, &temp);
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+	if (retval)
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+		return retval;
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 	if (temp > 255)
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 		temp = 255;
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 	else if (temp < 0)
..
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@@ -69,8 +71,13 @@
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 	}
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 	return count;
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 }
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-
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 static DEVICE_ATTR_RW(speed);
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+
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+static struct attribute *tv_attrs[] = {
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+	&dev_attr_speed.attr,
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+	NULL,
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+};
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+ATTRIBUTE_GROUPS(tv);
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 static int tv_probe(struct usb_interface *interface,
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 		    const struct usb_device_id *id)
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@@ -87,15 +94,9 @@
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 	dev->udev = usb_get_dev(udev);
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 	usb_set_intfdata(interface, dev);
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-	retval = device_create_file(&interface->dev, &dev_attr_speed);
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-	if (retval)
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-		goto error_create_file;
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 	return 0;
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-error_create_file:
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-	usb_put_dev(udev);
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-	usb_set_intfdata(interface, NULL);
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 error:
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 	kfree(dev);
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 	return retval;
..
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@@ -106,7 +107,6 @@
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 	struct trancevibrator *dev;
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 	dev = usb_get_intfdata (interface);
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-	device_remove_file(&interface->dev, &dev_attr_speed);
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 	usb_set_intfdata(interface, NULL);
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 	usb_put_dev(dev->udev);
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 	kfree(dev);
..
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@@ -118,6 +118,7 @@
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 	.probe =	tv_probe,
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 	.disconnect =	tv_disconnect,
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 	.id_table =	id_table,
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+	.dev_groups =	tv_groups,
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 };
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 module_usb_driver(tv_driver);