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"
44 		.name = "U2F Zero",
53 /* We only use broadcast (CID-less) messages */
63 			u8 data[HID_REPORT_SIZE - 7];
67 			u8 data[HID_REPORT_SIZE - 5];
97 	mutex_lock(&dev->lock);  in u2fzero_send()
99 	memcpy(dev->buf_out, req, sizeof(struct u2f_hid_report));  in u2fzero_send()
101 	ret = hid_hw_output_report(dev->hdev, dev->buf_out,  in u2fzero_send()
104 	mutex_unlock(&dev->lock);  in u2fzero_send()
109 	return ret == sizeof(struct u2f_hid_msg) ? 0 : -EMSGSIZE;  in u2fzero_send()
119 	struct u2fzero_transfer_context *ctx = urb->context;  in u2fzero_read_callback()
121 	ctx->status = urb->status;  in u2fzero_read_callback()
122 	complete(&ctx->done);  in u2fzero_read_callback()
130 	struct hid_device *hdev = dev->hdev;  in u2fzero_recv()
133 	mutex_lock(&dev->lock);  in u2fzero_recv()
135 	memcpy(dev->buf_out, req, sizeof(struct u2f_hid_report));  in u2fzero_recv()
137 	dev->urb->context = &ctx;  in u2fzero_recv()
140 	ret = usb_submit_urb(dev->urb, GFP_NOIO);  in u2fzero_recv()
146 	ret = hid_hw_output_report(dev->hdev, dev->buf_out,  in u2fzero_recv()
157 		usb_kill_urb(dev->urb);  in u2fzero_recv()
160 		ret = dev->urb->actual_length;  in u2fzero_recv()
161 		memcpy(resp, dev->buf_in, ret);  in u2fzero_recv()
165 	mutex_unlock(&dev->lock);  in u2fzero_recv()
178 			.cmd = hw_configs[dev->hw_revision].wink_cmd,  in u2fzero_blink()
190 	ldev->brightness = LED_OFF;  in u2fzero_brightness_set()
206 			.cmd = hw_configs[dev->hw_revision].rng_cmd,  in u2fzero_rng_read()
218 	if (!dev->present) {  in u2fzero_rng_read()
219 		hid_dbg(dev->hdev, "device not present");  in u2fzero_rng_read()
230 	actual_length = min3((size_t)ret - min_length,  in u2fzero_rng_read()
241 	dev->led_name = devm_kasprintf(&dev->hdev->dev, GFP_KERNEL,  in u2fzero_init_led()
243 	if (dev->led_name == NULL)  in u2fzero_init_led()
244 		return -ENOMEM;  in u2fzero_init_led()
246 	dev->ldev.name = dev->led_name;  in u2fzero_init_led()
247 	dev->ldev.max_brightness = LED_ON;  in u2fzero_init_led()
248 	dev->ldev.flags = LED_HW_PLUGGABLE;  in u2fzero_init_led()
249 	dev->ldev.brightness_set_blocking = u2fzero_brightness_set;  in u2fzero_init_led()
251 	return devm_led_classdev_register(&dev->hdev->dev, &dev->ldev);  in u2fzero_init_led()
257 	dev->rng_name = devm_kasprintf(&dev->hdev->dev, GFP_KERNEL,  in u2fzero_init_hwrng()
258 		"%s-rng%u", DRIVER_SHORT, minor);  in u2fzero_init_hwrng()
259 	if (dev->rng_name == NULL)  in u2fzero_init_hwrng()
260 		return -ENOMEM;  in u2fzero_init_hwrng()
262 	dev->hwrng.name = dev->rng_name;  in u2fzero_init_hwrng()
263 	dev->hwrng.read = u2fzero_rng_read;  in u2fzero_init_hwrng()
265 	return devm_hwrng_register(&dev->hdev->dev, &dev->hwrng);  in u2fzero_init_hwrng()
270 	struct hid_device *hdev = dev->hdev;  in u2fzero_fill_in_urb()
272 	struct usbhid_device *usbhid = hdev->driver_data;  in u2fzero_fill_in_urb()
276 	if (dev->hdev->bus != BUS_USB)  in u2fzero_fill_in_urb()
277 		return -EINVAL;  in u2fzero_fill_in_urb()
281 	if (!usbhid->urbout || !usbhid->urbin)  in u2fzero_fill_in_urb()
282 		return -ENODEV;  in u2fzero_fill_in_urb()
284 	ep = usb_pipe_endpoint(udev, usbhid->urbin->pipe);  in u2fzero_fill_in_urb()
286 		return -ENODEV;  in u2fzero_fill_in_urb()
288 	dev->urb = usb_alloc_urb(0, GFP_KERNEL);  in u2fzero_fill_in_urb()
289 	if (!dev->urb)  in u2fzero_fill_in_urb()
290 		return -ENOMEM;  in u2fzero_fill_in_urb()
292 	pipe_in = (usbhid->urbin->pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);  in u2fzero_fill_in_urb()
294 	usb_fill_int_urb(dev->urb,  in u2fzero_fill_in_urb()
297 		dev->buf_in,  in u2fzero_fill_in_urb()
301 		ep->desc.bInterval);  in u2fzero_fill_in_urb()
314 		return -EINVAL;  in u2fzero_probe()
316 	dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);  in u2fzero_probe()
318 		return -ENOMEM;  in u2fzero_probe()
320 	dev->hw_revision = id->driver_data;  in u2fzero_probe()
322 	dev->buf_out = devm_kmalloc(&hdev->dev,  in u2fzero_probe()
324 	if (dev->buf_out == NULL)  in u2fzero_probe()
325 		return -ENOMEM;  in u2fzero_probe()
327 	dev->buf_in = devm_kmalloc(&hdev->dev,  in u2fzero_probe()
329 	if (dev->buf_in == NULL)  in u2fzero_probe()
330 		return -ENOMEM;  in u2fzero_probe()
336 	dev->hdev = hdev;  in u2fzero_probe()
338 	mutex_init(&dev->lock);  in u2fzero_probe()
346 	dev->present = true;  in u2fzero_probe()
348 	minor = ((struct hidraw *) hdev->hidraw)->minor;  in u2fzero_probe()
356 	hid_info(hdev, "%s LED initialised\n", hw_configs[dev->hw_revision].name);  in u2fzero_probe()
364 	hid_info(hdev, "%s RNG initialised\n", hw_configs[dev->hw_revision].name);  in u2fzero_probe()
373 	mutex_lock(&dev->lock);  in u2fzero_remove()
374 	dev->present = false;  in u2fzero_remove()
375 	mutex_unlock(&dev->lock);  in u2fzero_remove()
378 	usb_poison_urb(dev->urb);  in u2fzero_remove()
379 	usb_free_urb(dev->urb);  in u2fzero_remove()
394 	.name = "hid-" DRIVER_SHORT,
404 MODULE_DESCRIPTION("U2F Zero LED and RNG driver");