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2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777 
 kernel/drivers/usb/gadget/configfs.c
....@@ -16,7 +16,7 @@
1616 #include <linux/usb/ch9.h>
1717 
1818 #ifdef CONFIG_USB_CONFIGFS_F_ACC
19
-extern int acc_ctrlrequest(struct usb_composite_dev *cdev,
19
+extern int acc_ctrlrequest_composite(struct usb_composite_dev *cdev,
2020 				const struct usb_ctrlrequest *ctrl);
2121 void acc_disconnect(void);
2222 #endif
....@@ -39,8 +39,6 @@
3939 int check_user_usb_string(const char *name,
4040 		struct usb_gadget_strings *stringtab_dev)
4141 {
42
-	unsigned primary_lang;
43
-	unsigned sub_lang;
4442 	u16 num;
4543 	int ret;
4644 
....@@ -48,17 +46,7 @@
4846 	if (ret)
4947 		return ret;
5048 
51
-	primary_lang = num & 0x3ff;
52
-	sub_lang = num >> 10;
53
-
54
-	/* simple sanity check for valid langid */
55
-	switch (primary_lang) {
56
-	case 0:
57
-	case 0x62 ... 0xfe:
58
-	case 0x100 ... 0x3ff:
59
-		return -EINVAL;
60
-	}
61
-	if (!sub_lang)
49
+	if (!usb_validate_langid(num))
6250 		return -EINVAL;
6351 
6452 	stringtab_dev->language = num;
....@@ -341,6 +329,47 @@
341329 	return ret;
342330 }
343331 
332
+static ssize_t gadget_dev_desc_max_speed_show(struct config_item *item,
333
+					      char *page)
334
+{
335
+	enum usb_device_speed speed = to_gadget_info(item)->composite.max_speed;
336
+
337
+	return sprintf(page, "%s\n", usb_speed_string(speed));
338
+}
339
+
340
+static ssize_t gadget_dev_desc_max_speed_store(struct config_item *item,
341
+					       const char *page, size_t len)
342
+{
343
+	struct gadget_info *gi = to_gadget_info(item);
344
+
345
+	mutex_lock(&gi->lock);
346
+
347
+	/* Prevent changing of max_speed after the driver is binded */
348
+	if (gi->composite.gadget_driver.udc_name)
349
+		goto err;
350
+
351
+	if (strncmp(page, "super-speed-plus", 16) == 0)
352
+		gi->composite.max_speed = USB_SPEED_SUPER_PLUS;
353
+	else if (strncmp(page, "super-speed", 11) == 0)
354
+		gi->composite.max_speed = USB_SPEED_SUPER;
355
+	else if (strncmp(page, "high-speed", 10) == 0)
356
+		gi->composite.max_speed = USB_SPEED_HIGH;
357
+	else if (strncmp(page, "full-speed", 10) == 0)
358
+		gi->composite.max_speed = USB_SPEED_FULL;
359
+	else if (strncmp(page, "low-speed", 9) == 0)
360
+		gi->composite.max_speed = USB_SPEED_LOW;
361
+	else
362
+		goto err;
363
+
364
+	gi->composite.gadget_driver.max_speed = gi->composite.max_speed;
365
+
366
+	mutex_unlock(&gi->lock);
367
+	return len;
368
+err:
369
+	mutex_unlock(&gi->lock);
370
+	return -EINVAL;
371
+}
372
+
344373 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceClass);
345374 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceSubClass);
346375 CONFIGFS_ATTR(gadget_dev_desc_, bDeviceProtocol);
....@@ -350,6 +379,7 @@
350379 CONFIGFS_ATTR(gadget_dev_desc_, bcdDevice);
351380 CONFIGFS_ATTR(gadget_dev_desc_, bcdUSB);
352381 CONFIGFS_ATTR(gadget_dev_desc_, UDC);
382
+CONFIGFS_ATTR(gadget_dev_desc_, max_speed);
353383 
354384 static struct configfs_attribute *gadget_root_attrs[] = {
355385 	&gadget_dev_desc_attr_bDeviceClass,
....@@ -361,6 +391,7 @@
361391 	&gadget_dev_desc_attr_bcdDevice,
362392 	&gadget_dev_desc_attr_bcdUSB,
363393 	&gadget_dev_desc_attr_UDC,
394
+	&gadget_dev_desc_attr_max_speed,
364395 	NULL,
365396 };
366397 
....@@ -430,6 +461,12 @@
430461 	 * from another gadget or a random directory.
431462 	 * Also a function instance can only be linked once.
432463 	 */
464
+
465
+	if (gi->composite.gadget_driver.udc_name) {
466
+		ret = -EINVAL;
467
+		goto out;
468
+	}
469
+
433470 	list_for_each_entry(a_fi, &gi->available_func, cfs_list) {
434471 		if (a_fi == fi)
435472 			break;
....@@ -1408,6 +1445,10 @@
14081445 				goto err_purge_funcs;
14091446 			}
14101447 		}
1448
+		ret = usb_gadget_check_config(cdev->gadget);
1449
+		if (ret)
1450
+			goto err_purge_funcs;
1451
+
14111452 		usb_ep_autoconfig_reset(cdev->gadget);
14121453 	}
14131454 	if (cdev->use_os_string) {
....@@ -1498,11 +1539,67 @@
14981539 	usb_ep_autoconfig_reset(cdev->gadget);
14991540 	spin_lock_irqsave(&gi->spinlock, flags);
15001541 	cdev->gadget = NULL;
1542
+	cdev->deactivations = 0;
1543
+	gadget->deactivated = false;
15011544 	set_gadget_data(gadget, NULL);
15021545 	spin_unlock_irqrestore(&gi->spinlock, flags);
15031546 }
15041547 
1505
-#ifndef CONFIG_USB_CONFIGFS_UEVENT
1548
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
1549
+static int android_setup(struct usb_gadget *gadget,
1550
+			const struct usb_ctrlrequest *c)
1551
+{
1552
+	struct usb_composite_dev *cdev;
1553
+	unsigned long flags;
1554
+	struct gadget_info *gi;
1555
+	int value = -EOPNOTSUPP;
1556
+	struct usb_function_instance *fi;
1557
+
1558
+	cdev = get_gadget_data(gadget);
1559
+	if (!cdev)
1560
+		return 0;
1561
+
1562
+	gi = container_of(cdev, struct gadget_info, cdev);
1563
+	spin_lock_irqsave(&gi->spinlock, flags);
1564
+	cdev = get_gadget_data(gadget);
1565
+	if (!cdev || gi->unbind) {
1566
+		spin_unlock_irqrestore(&gi->spinlock, flags);
1567
+		return 0;
1568
+	}
1569
+
1570
+	if (c->bRequest == USB_REQ_GET_DESCRIPTOR &&
1571
+	    (c->wValue >> 8) == USB_DT_CONFIG && !gi->connected) {
1572
+		gi->connected = 1;
1573
+		schedule_work(&gi->work);
1574
+	}
1575
+
1576
+	list_for_each_entry(fi, &gi->available_func, cfs_list) {
1577
+		if (fi != NULL && fi->f != NULL && fi->f->setup != NULL) {
1578
+			value = fi->f->setup(fi->f, c);
1579
+			if (value >= 0)
1580
+				break;
1581
+		}
1582
+	}
1583
+
1584
+#ifdef CONFIG_USB_CONFIGFS_F_ACC
1585
+	if (value < 0)
1586
+		value = acc_ctrlrequest_composite(cdev, c);
1587
+#endif
1588
+
1589
+	if (value < 0)
1590
+		value = composite_setup(gadget, c);
1591
+
1592
+	if (c->bRequest == USB_REQ_SET_CONFIGURATION &&
1593
+						cdev->config) {
1594
+		schedule_work(&gi->work);
1595
+	}
1596
+	spin_unlock_irqrestore(&gi->spinlock, flags);
1597
+
1598
+	return value;
1599
+}
1600
+
1601
+#else // CONFIG_USB_CONFIGFS_UEVENT
1602
+
15061603 static int configfs_composite_setup(struct usb_gadget *gadget,
15071604 		const struct usb_ctrlrequest *ctrl)
15081605 {
....@@ -1528,7 +1625,43 @@
15281625 	return ret;
15291626 }
15301627 
1628
+#endif // CONFIG_USB_CONFIGFS_UEVENT
1629
+
15311630 static void configfs_composite_disconnect(struct usb_gadget *gadget)
1631
+{
1632
+	struct usb_composite_dev *cdev;
1633
+	struct gadget_info *gi;
1634
+	unsigned long flags;
1635
+
1636
+	cdev = get_gadget_data(gadget);
1637
+	if (!cdev)
1638
+		return;
1639
+
1640
+#ifdef CONFIG_USB_CONFIGFS_F_ACC
1641
+	/*
1642
+	 * accessory HID support can be active while the
1643
+	 * accessory function is not actually enabled,
1644
+	 * so we need to inform it when we are disconnected.
1645
+	 */
1646
+	acc_disconnect();
1647
+#endif
1648
+	gi = container_of(cdev, struct gadget_info, cdev);
1649
+	spin_lock_irqsave(&gi->spinlock, flags);
1650
+	cdev = get_gadget_data(gadget);
1651
+	if (!cdev || gi->unbind) {
1652
+		spin_unlock_irqrestore(&gi->spinlock, flags);
1653
+		return;
1654
+	}
1655
+
1656
+#ifdef CONFIG_USB_CONFIGFS_UEVENT
1657
+	gi->connected = 0;
1658
+	schedule_work(&gi->work);
1659
+#endif
1660
+	composite_disconnect(gadget);
1661
+	spin_unlock_irqrestore(&gi->spinlock, flags);
1662
+}
1663
+
1664
+static void configfs_composite_reset(struct usb_gadget *gadget)
15321665 {
15331666 	struct usb_composite_dev *cdev;
15341667 	struct gadget_info *gi;
....@@ -1546,10 +1679,9 @@
15461679 		return;
15471680 	}
15481681 
1549
-	composite_disconnect(gadget);
1682
+	composite_reset(gadget);
15501683 	spin_unlock_irqrestore(&gi->spinlock, flags);
15511684 }
1552
-#endif
15531685 
15541686 static void configfs_composite_suspend(struct usb_gadget *gadget)
15551687 {
....@@ -1595,92 +1727,17 @@
15951727 	spin_unlock_irqrestore(&gi->spinlock, flags);
15961728 }
15971729 
1598
-#ifdef CONFIG_USB_CONFIGFS_UEVENT
1599
-static int android_setup(struct usb_gadget *gadget,
1600
-			const struct usb_ctrlrequest *c)
1601
-{
1602
-	struct usb_composite_dev *cdev = get_gadget_data(gadget);
1603
-	unsigned long flags;
1604
-	struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
1605
-	int value = -EOPNOTSUPP;
1606
-	struct usb_function_instance *fi;
1607
-
1608
-	spin_lock_irqsave(&cdev->lock, flags);
1609
-	if (c->bRequest == USB_REQ_GET_DESCRIPTOR &&
1610
-	    (c->wValue >> 8) == USB_DT_CONFIG && !gi->connected) {
1611
-		gi->connected = 1;
1612
-		schedule_work(&gi->work);
1613
-	}
1614
-	spin_unlock_irqrestore(&cdev->lock, flags);
1615
-	list_for_each_entry(fi, &gi->available_func, cfs_list) {
1616
-		if (fi != NULL && fi->f != NULL && fi->f->setup != NULL) {
1617
-			value = fi->f->setup(fi->f, c);
1618
-			if (value >= 0)
1619
-				break;
1620
-		}
1621
-	}
1622
-
1623
-#ifdef CONFIG_USB_CONFIGFS_F_ACC
1624
-	if (value < 0)
1625
-		value = acc_ctrlrequest(cdev, c);
1626
-#endif
1627
-
1628
-	if (value < 0)
1629
-		value = composite_setup(gadget, c);
1630
-
1631
-	spin_lock_irqsave(&cdev->lock, flags);
1632
-	if (c->bRequest == USB_REQ_SET_CONFIGURATION &&
1633
-						cdev->config) {
1634
-		schedule_work(&gi->work);
1635
-	}
1636
-	spin_unlock_irqrestore(&cdev->lock, flags);
1637
-
1638
-	return value;
1639
-}
1640
-
1641
-static void android_disconnect(struct usb_gadget *gadget)
1642
-{
1643
-	struct usb_composite_dev        *cdev = get_gadget_data(gadget);
1644
-	struct gadget_info *gi = container_of(cdev, struct gadget_info, cdev);
1645
-
1646
-	/* FIXME: There's a race between usb_gadget_udc_stop() which is likely
1647
-	 * to set the gadget driver to NULL in the udc driver and this drivers
1648
-	 * gadget disconnect fn which likely checks for the gadget driver to
1649
-	 * be a null ptr. It happens that unbind (doing set_gadget_data(NULL))
1650
-	 * is called before the gadget driver is set to NULL and the udc driver
1651
-	 * calls disconnect fn which results in cdev being a null ptr.
1652
-	 */
1653
-	if (cdev == NULL) {
1654
-		WARN(1, "%s: gadget driver already disconnected\n", __func__);
1655
-		return;
1656
-	}
1657
-
1658
-	/* accessory HID support can be active while the
1659
-		accessory function is not actually enabled,
1660
-		so we need to inform it when we are disconnected.
1661
-	*/
1662
-
1663
-#ifdef CONFIG_USB_CONFIGFS_F_ACC
1664
-	acc_disconnect();
1665
-#endif
1666
-	gi->connected = 0;
1667
-	schedule_work(&gi->work);
1668
-	composite_disconnect(gadget);
1669
-}
1670
-#endif
1671
-
16721730 static const struct usb_gadget_driver configfs_driver_template = {
16731731 	.bind           = configfs_composite_bind,
16741732 	.unbind         = configfs_composite_unbind,
1733
+
16751734 #ifdef CONFIG_USB_CONFIGFS_UEVENT
16761735 	.setup          = android_setup,
1677
-	.reset          = android_disconnect,
1678
-	.disconnect     = android_disconnect,
16791736 #else
16801737 	.setup          = configfs_composite_setup,
1681
-	.reset          = configfs_composite_disconnect,
1682
-	.disconnect     = configfs_composite_disconnect,
16831738 #endif
1739
+	.reset          = configfs_composite_reset,
1740
+	.disconnect     = configfs_composite_disconnect,
16841741 	.suspend	= configfs_composite_suspend,
16851742 	.resume		= configfs_composite_resume,
16861743