1 // SPDX-License-Identifier: GPL-2.0
3  * U2F Zero LED and RNG driver
6  * Loosely based on drivers/hid/hid-led.c
23 #include "hid-ids.h"
29 /* We only use broadcast (CID-less) messages */
39 			u8 data[HID_REPORT_SIZE - 7];
43 			u8 data[HID_REPORT_SIZE - 5];
76 	mutex_lock(&dev->lock);  in u2fzero_send()
78 	memcpy(dev->buf_out, req, sizeof(struct u2f_hid_report));  in u2fzero_send()
80 	ret = hid_hw_output_report(dev->hdev, dev->buf_out,  in u2fzero_send()
83 	mutex_unlock(&dev->lock);  in u2fzero_send()
88 	return ret == sizeof(struct u2f_hid_msg) ? 0 : -EMSGSIZE;  in u2fzero_send()
98 	struct u2fzero_transfer_context *ctx = urb->context;  in u2fzero_read_callback()
100 	ctx->status = urb->status;  in u2fzero_read_callback()
101 	complete(&ctx->done);  in u2fzero_read_callback()
109 	struct hid_device *hdev = dev->hdev;  in u2fzero_recv()
112 	mutex_lock(&dev->lock);  in u2fzero_recv()
114 	memcpy(dev->buf_out, req, sizeof(struct u2f_hid_report));  in u2fzero_recv()
116 	dev->urb->context = &ctx;  in u2fzero_recv()
119 	ret = usb_submit_urb(dev->urb, GFP_NOIO);  in u2fzero_recv()
125 	ret = hid_hw_output_report(dev->hdev, dev->buf_out,  in u2fzero_recv()
136 		usb_kill_urb(dev->urb);  in u2fzero_recv()
139 		ret = dev->urb->actual_length;  in u2fzero_recv()
140 		memcpy(resp, dev->buf_in, ret);  in u2fzero_recv()
144 	mutex_unlock(&dev->lock);  in u2fzero_recv()
169 	ldev->brightness = LED_OFF;  in u2fzero_brightness_set()
197 	if (!dev->present) {  in u2fzero_rng_read()
198 		hid_dbg(dev->hdev, "device not present");  in u2fzero_rng_read()
209 	actual_length = min3((size_t)ret - min_length,  in u2fzero_rng_read()
220 	dev->led_name = devm_kasprintf(&dev->hdev->dev, GFP_KERNEL,  in u2fzero_init_led()
222 	if (dev->led_name == NULL)  in u2fzero_init_led()
223 		return -ENOMEM;  in u2fzero_init_led()
225 	dev->ldev.name = dev->led_name;  in u2fzero_init_led()
226 	dev->ldev.max_brightness = LED_ON;  in u2fzero_init_led()
227 	dev->ldev.flags = LED_HW_PLUGGABLE;  in u2fzero_init_led()
228 	dev->ldev.brightness_set_blocking = u2fzero_brightness_set;  in u2fzero_init_led()
230 	return devm_led_classdev_register(&dev->hdev->dev, &dev->ldev);  in u2fzero_init_led()
236 	dev->rng_name = devm_kasprintf(&dev->hdev->dev, GFP_KERNEL,  in u2fzero_init_hwrng()
237 		"%s-rng%u", DRIVER_SHORT, minor);  in u2fzero_init_hwrng()
238 	if (dev->rng_name == NULL)  in u2fzero_init_hwrng()
239 		return -ENOMEM;  in u2fzero_init_hwrng()
241 	dev->hwrng.name = dev->rng_name;  in u2fzero_init_hwrng()
242 	dev->hwrng.read = u2fzero_rng_read;  in u2fzero_init_hwrng()
243 	dev->hwrng.quality = 1;  in u2fzero_init_hwrng()
245 	return devm_hwrng_register(&dev->hdev->dev, &dev->hwrng);  in u2fzero_init_hwrng()
250 	struct hid_device *hdev = dev->hdev;  in u2fzero_fill_in_urb()
252 	struct usbhid_device *usbhid = hdev->driver_data;  in u2fzero_fill_in_urb()
256 	if (dev->hdev->bus != BUS_USB)  in u2fzero_fill_in_urb()
257 		return -EINVAL;  in u2fzero_fill_in_urb()
261 	if (!usbhid->urbout || !usbhid->urbin)  in u2fzero_fill_in_urb()
262 		return -ENODEV;  in u2fzero_fill_in_urb()
264 	ep = usb_pipe_endpoint(udev, usbhid->urbin->pipe);  in u2fzero_fill_in_urb()
266 		return -ENODEV;  in u2fzero_fill_in_urb()
268 	dev->urb = usb_alloc_urb(0, GFP_KERNEL);  in u2fzero_fill_in_urb()
269 	if (!dev->urb)  in u2fzero_fill_in_urb()
270 		return -ENOMEM;  in u2fzero_fill_in_urb()
272 	pipe_in = (usbhid->urbin->pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);  in u2fzero_fill_in_urb()
274 	usb_fill_int_urb(dev->urb,  in u2fzero_fill_in_urb()
277 		dev->buf_in,  in u2fzero_fill_in_urb()
281 		ep->desc.bInterval);  in u2fzero_fill_in_urb()
294 		return -EINVAL;  in u2fzero_probe()
296 	dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);  in u2fzero_probe()
298 		return -ENOMEM;  in u2fzero_probe()
300 	dev->buf_out = devm_kmalloc(&hdev->dev,  in u2fzero_probe()
302 	if (dev->buf_out == NULL)  in u2fzero_probe()
303 		return -ENOMEM;  in u2fzero_probe()
305 	dev->buf_in = devm_kmalloc(&hdev->dev,  in u2fzero_probe()
307 	if (dev->buf_in == NULL)  in u2fzero_probe()
308 		return -ENOMEM;  in u2fzero_probe()
314 	dev->hdev = hdev;  in u2fzero_probe()
316 	mutex_init(&dev->lock);  in u2fzero_probe()
324 	dev->present = true;  in u2fzero_probe()
326 	minor = ((struct hidraw *) hdev->hidraw)->minor;  in u2fzero_probe()
334 	hid_info(hdev, "U2F Zero LED initialised\n");  in u2fzero_probe()
342 	hid_info(hdev, "U2F Zero RNG initialised\n");  in u2fzero_probe()
351 	mutex_lock(&dev->lock);  in u2fzero_remove()
352 	dev->present = false;  in u2fzero_remove()
353 	mutex_unlock(&dev->lock);  in u2fzero_remove()
356 	usb_poison_urb(dev->urb);  in u2fzero_remove()
357 	usb_free_urb(dev->urb);  in u2fzero_remove()
368 	.name = "hid-" DRIVER_SHORT,
378 MODULE_DESCRIPTION("U2F Zero LED and RNG driver");