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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/sound/usb/line6/driver.c
....@@ -1,12 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Line 6 Linux USB driver
34  *
45  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
5
- *
6
- *	This program is free software; you can redistribute it and/or
7
- *	modify it under the terms of the GNU General Public License as
8
- *	published by the Free Software Foundation, version 2.
9
- *
106  */
117 
128 #include <linux/kernel.h>
....@@ -101,7 +97,7 @@
10197 /*
10298 	Send raw message in pieces of wMaxPacketSize bytes.
10399 */
104
-static int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
100
+int line6_send_raw_message(struct usb_line6 *line6, const char *buffer,
105101 				  int size)
106102 {
107103 	int i, done = 0;
....@@ -136,6 +132,7 @@
136132 
137133 	return done;
138134 }
135
+EXPORT_SYMBOL_GPL(line6_send_raw_message);
139136 
140137 /*
141138 	Notification of completion of asynchronous request transmission.
....@@ -194,17 +191,6 @@
194191 	kfree(msg);
195192 	return retval;
196193 }
197
-
198
-/*
199
-	Setup and start timer.
200
-*/
201
-void line6_start_timer(struct timer_list *timer, unsigned long msecs,
202
-		       void (*function)(struct timer_list *t))
203
-{
204
-	timer->function = function;
205
-	mod_timer(timer, jiffies + msecs_to_jiffies(msecs));
206
-}
207
-EXPORT_SYMBOL_GPL(line6_start_timer);
208194 
209195 /*
210196 	Asynchronously send raw message.
....@@ -318,7 +304,8 @@
318304 		for (;;) {
319305 			done =
320306 				line6_midibuf_read(mb, line6->buffer_message,
321
-						LINE6_MIDI_MESSAGE_MAXLEN);
307
+						   LINE6_MIDI_MESSAGE_MAXLEN,
308
+						   LINE6_MIDIBUF_READ_RX);
322309 
323310 			if (done <= 0)
324311 				break;
....@@ -351,23 +338,18 @@
351338 {
352339 	struct usb_device *usbdev = line6->usbdev;
353340 	int ret;
354
-	unsigned char *len;
341
+	u8 len;
355342 	unsigned count;
356343 
357344 	if (address > 0xffff || datalen > 0xff)
358345 		return -EINVAL;
359346 
360
-	len = kmalloc(sizeof(*len), GFP_KERNEL);
361
-	if (!len)
362
-		return -ENOMEM;
363
-
364347 	/* query the serial number: */
365
-	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
366
-			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
367
-			      (datalen << 8) | 0x21, address,
368
-			      NULL, 0, LINE6_TIMEOUT);
369
-
370
-	if (ret < 0) {
348
+	ret = usb_control_msg_send(usbdev, 0, 0x67,
349
+				   USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
350
+				   (datalen << 8) | 0x21, address, NULL, 0,
351
+				   LINE6_TIMEOUT, GFP_KERNEL);
352
+	if (ret) {
371353 		dev_err(line6->ifcdev, "read request failed (error %d)\n", ret);
372354 		goto exit;
373355 	}
....@@ -376,45 +358,42 @@
376358 	for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
377359 		mdelay(LINE6_READ_WRITE_STATUS_DELAY);
378360 
379
-		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
380
-				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
381
-				      USB_DIR_IN,
382
-				      0x0012, 0x0000, len, 1,
383
-				      LINE6_TIMEOUT);
384
-		if (ret < 0) {
361
+		ret = usb_control_msg_recv(usbdev, 0, 0x67,
362
+					   USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
363
+					   0x0012, 0x0000, &len, 1,
364
+					   LINE6_TIMEOUT, GFP_KERNEL);
365
+		if (ret) {
385366 			dev_err(line6->ifcdev,
386367 				"receive length failed (error %d)\n", ret);
387368 			goto exit;
388369 		}
389370 
390
-		if (*len != 0xff)
371
+		if (len != 0xff)
391372 			break;
392373 	}
393374 
394375 	ret = -EIO;
395
-	if (*len == 0xff) {
376
+	if (len == 0xff) {
396377 		dev_err(line6->ifcdev, "read failed after %d retries\n",
397378 			count);
398379 		goto exit;
399
-	} else if (*len != datalen) {
380
+	} else if (len != datalen) {
400381 		/* should be equal or something went wrong */
401382 		dev_err(line6->ifcdev,
402383 			"length mismatch (expected %d, got %d)\n",
403
-			(int)datalen, (int)*len);
384
+			(int)datalen, len);
404385 		goto exit;
405386 	}
406387 
407388 	/* receive the result: */
408
-	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0), 0x67,
409
-			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
410
-			      0x0013, 0x0000, data, datalen,
411
-			      LINE6_TIMEOUT);
412
-
413
-	if (ret < 0)
389
+	ret = usb_control_msg_recv(usbdev, 0, 0x67,
390
+				   USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
391
+				   0x0013, 0x0000, data, datalen, LINE6_TIMEOUT,
392
+				   GFP_KERNEL);
393
+	if (ret)
414394 		dev_err(line6->ifcdev, "read failed (error %d)\n", ret);
415395 
416396 exit:
417
-	kfree(len);
418397 	return ret;
419398 }
420399 EXPORT_SYMBOL_GPL(line6_read_data);
....@@ -433,16 +412,15 @@
433412 	if (address > 0xffff || datalen > 0xffff)
434413 		return -EINVAL;
435414 
436
-	status = kmalloc(sizeof(*status), GFP_KERNEL);
415
+	status = kmalloc(1, GFP_KERNEL);
437416 	if (!status)
438417 		return -ENOMEM;
439418 
440
-	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev, 0), 0x67,
441
-			      USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
442
-			      0x0022, address, data, datalen,
443
-			      LINE6_TIMEOUT);
444
-
445
-	if (ret < 0) {
419
+	ret = usb_control_msg_send(usbdev, 0, 0x67,
420
+				   USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
421
+				   0x0022, address, data, datalen, LINE6_TIMEOUT,
422
+				   GFP_KERNEL);
423
+	if (ret) {
446424 		dev_err(line6->ifcdev,
447425 			"write request failed (error %d)\n", ret);
448426 		goto exit;
....@@ -451,14 +429,11 @@
451429 	for (count = 0; count < LINE6_READ_WRITE_MAX_RETRIES; count++) {
452430 		mdelay(LINE6_READ_WRITE_STATUS_DELAY);
453431 
454
-		ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
455
-				      0x67,
456
-				      USB_TYPE_VENDOR | USB_RECIP_DEVICE |
457
-				      USB_DIR_IN,
458
-				      0x0012, 0x0000,
459
-				      status, 1, LINE6_TIMEOUT);
460
-
461
-		if (ret < 0) {
432
+		ret = usb_control_msg_recv(usbdev, 0, 0x67,
433
+					   USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
434
+					   0x0012, 0x0000, status, 1, LINE6_TIMEOUT,
435
+					   GFP_KERNEL);
436
+		if (ret) {
462437 			dev_err(line6->ifcdev,
463438 				"receiving status failed (error %d)\n", ret);
464439 			goto exit;
....@@ -565,6 +540,7 @@
565540 	/* NOTE: hwdep layer provides atomicity here */
566541 
567542 	line6->messages.active = 1;
543
+	line6->messages.nonblock = file->f_flags & O_NONBLOCK ? 1 : 0;
568544 
569545 	return 0;
570546 }
....@@ -593,6 +569,9 @@
593569 
594570 	while (kfifo_len(&line6->messages.fifo) == 0) {
595571 		mutex_unlock(&line6->messages.read_lock);
572
+
573
+		if (line6->messages.nonblock)
574
+			return -EAGAIN;
596575 
597576 		rv = wait_event_interruptible(
598577 			line6->messages.wait_queue,
....@@ -641,11 +620,27 @@
641620 	return rv;
642621 }
643622 
623
+static __poll_t
624
+line6_hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
625
+{
626
+	__poll_t rv;
627
+	struct usb_line6 *line6 = hwdep->private_data;
628
+
629
+	poll_wait(file, &line6->messages.wait_queue, wait);
630
+
631
+	mutex_lock(&line6->messages.read_lock);
632
+	rv = kfifo_len(&line6->messages.fifo) == 0 ? 0 : EPOLLIN | EPOLLRDNORM;
633
+	mutex_unlock(&line6->messages.read_lock);
634
+
635
+	return rv;
636
+}
637
+
644638 static const struct snd_hwdep_ops hwdep_ops = {
645639 	.open    = line6_hwdep_open,
646640 	.release = line6_hwdep_release,
647641 	.read    = line6_hwdep_read,
648642 	.write   = line6_hwdep_write,
643
+	.poll    = line6_hwdep_poll,
649644 };
650645 
651646 /* Insert into circular buffer */
....@@ -875,10 +870,8 @@
875870 	if (line6->properties->capabilities & LINE6_CAP_CONTROL)
876871 		line6_stop_listen(line6);
877872 
878
-	if (line6pcm != NULL) {
879
-		snd_pcm_suspend_all(line6pcm->pcm);
873
+	if (line6pcm != NULL)
880874 		line6pcm->flags = 0;
881
-	}
882875 
883876 	return 0;
884877 }