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hc
2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/drivers/usb/gadget/function/f_accessory.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
23  * Gadget Function Driver for Android USB accessories
34  *
....@@ -119,6 +120,12 @@
119120 	/* delayed work for handling ACCESSORY_START */
120121 	struct delayed_work start_work;
121122 
123
+	/* work for handling ACCESSORY GET PROTOCOL */
124
+	struct work_struct getprotocol_work;
125
+
126
+	/* work for handling ACCESSORY SEND STRING */
127
+	struct work_struct sendstring_work;
128
+
122129 	/* worker for registering and unregistering hid devices */
123130 	struct work_struct hid_work;
124131 
....@@ -142,12 +149,62 @@
142149 	.bInterfaceProtocol     = 0,
143150 };
144151 
152
+static struct usb_endpoint_descriptor acc_superspeedplus_in_desc = {
153
+	.bLength                = USB_DT_ENDPOINT_SIZE,
154
+	.bDescriptorType        = USB_DT_ENDPOINT,
155
+	.bEndpointAddress       = USB_DIR_IN,
156
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
157
+	.wMaxPacketSize         = cpu_to_le16(1024),
158
+};
159
+
160
+static struct usb_endpoint_descriptor acc_superspeedplus_out_desc = {
161
+	.bLength                = USB_DT_ENDPOINT_SIZE,
162
+	.bDescriptorType        = USB_DT_ENDPOINT,
163
+	.bEndpointAddress       = USB_DIR_OUT,
164
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
165
+	.wMaxPacketSize         = cpu_to_le16(1024),
166
+};
167
+
168
+static struct usb_ss_ep_comp_descriptor acc_superspeedplus_comp_desc = {
169
+	.bLength                = sizeof(acc_superspeedplus_comp_desc),
170
+	.bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
171
+
172
+	/* the following 2 values can be tweaked if necessary */
173
+	/* .bMaxBurst =         0, */
174
+	/* .bmAttributes =      0, */
175
+};
176
+
177
+static struct usb_endpoint_descriptor acc_superspeed_in_desc = {
178
+	.bLength                = USB_DT_ENDPOINT_SIZE,
179
+	.bDescriptorType        = USB_DT_ENDPOINT,
180
+	.bEndpointAddress       = USB_DIR_IN,
181
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
182
+	.wMaxPacketSize         = cpu_to_le16(1024),
183
+};
184
+
185
+static struct usb_endpoint_descriptor acc_superspeed_out_desc = {
186
+	.bLength                = USB_DT_ENDPOINT_SIZE,
187
+	.bDescriptorType        = USB_DT_ENDPOINT,
188
+	.bEndpointAddress       = USB_DIR_OUT,
189
+	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
190
+	.wMaxPacketSize         = cpu_to_le16(1024),
191
+};
192
+
193
+static struct usb_ss_ep_comp_descriptor acc_superspeed_comp_desc = {
194
+	.bLength                = sizeof(acc_superspeed_comp_desc),
195
+	.bDescriptorType        = USB_DT_SS_ENDPOINT_COMP,
196
+
197
+	/* the following 2 values can be tweaked if necessary */
198
+	/* .bMaxBurst =         0, */
199
+	/* .bmAttributes =      0, */
200
+};
201
+
145202 static struct usb_endpoint_descriptor acc_highspeed_in_desc = {
146203 	.bLength                = USB_DT_ENDPOINT_SIZE,
147204 	.bDescriptorType        = USB_DT_ENDPOINT,
148205 	.bEndpointAddress       = USB_DIR_IN,
149206 	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
150
-	.wMaxPacketSize         = __constant_cpu_to_le16(512),
207
+	.wMaxPacketSize         = cpu_to_le16(512),
151208 };
152209 
153210 static struct usb_endpoint_descriptor acc_highspeed_out_desc = {
....@@ -155,7 +212,7 @@
155212 	.bDescriptorType        = USB_DT_ENDPOINT,
156213 	.bEndpointAddress       = USB_DIR_OUT,
157214 	.bmAttributes           = USB_ENDPOINT_XFER_BULK,
158
-	.wMaxPacketSize         = __constant_cpu_to_le16(512),
215
+	.wMaxPacketSize         = cpu_to_le16(512),
159216 };
160217 
161218 static struct usb_endpoint_descriptor acc_fullspeed_in_desc = {
....@@ -183,6 +240,24 @@
183240 	(struct usb_descriptor_header *) &acc_interface_desc,
184241 	(struct usb_descriptor_header *) &acc_highspeed_in_desc,
185242 	(struct usb_descriptor_header *) &acc_highspeed_out_desc,
243
+	NULL,
244
+};
245
+
246
+static struct usb_descriptor_header *ss_acc_descs[] = {
247
+	(struct usb_descriptor_header *) &acc_interface_desc,
248
+	(struct usb_descriptor_header *) &acc_superspeed_in_desc,
249
+	(struct usb_descriptor_header *) &acc_superspeed_comp_desc,
250
+	(struct usb_descriptor_header *) &acc_superspeed_out_desc,
251
+	(struct usb_descriptor_header *) &acc_superspeed_comp_desc,
252
+	NULL,
253
+};
254
+
255
+static struct usb_descriptor_header *ssp_acc_descs[] = {
256
+	(struct usb_descriptor_header *) &acc_interface_desc,
257
+	(struct usb_descriptor_header *) &acc_superspeedplus_in_desc,
258
+	(struct usb_descriptor_header *) &acc_superspeedplus_comp_desc,
259
+	(struct usb_descriptor_header *) &acc_superspeedplus_out_desc,
260
+	(struct usb_descriptor_header *) &acc_superspeedplus_comp_desc,
186261 	NULL,
187262 };
188263 
....@@ -229,6 +304,8 @@
229304 
230305 	/* Cancel any async work */
231306 	cancel_delayed_work_sync(&dev->start_work);
307
+	cancel_work_sync(&dev->getprotocol_work);
308
+	cancel_work_sync(&dev->sendstring_work);
232309 	cancel_work_sync(&dev->hid_work);
233310 
234311 	ref->acc_dev = NULL;
....@@ -721,16 +798,16 @@
721798 	}
722799 
723800 	while (count > 0) {
724
-		if (!dev->online) {
801
+		/* get an idle tx request to use */
802
+		req = 0;
803
+		ret = wait_event_interruptible(dev->write_wq,
804
+			((req = req_get(dev, &dev->tx_idle)) || !dev->online));
805
+		if (!dev->online || dev->disconnected) {
725806 			pr_debug("acc_write dev->error\n");
726807 			r = -EIO;
727808 			break;
728809 		}
729810 
730
-		/* get an idle tx request to use */
731
-		req = 0;
732
-		ret = wait_event_interruptible(dev->write_wq,
733
-			((req = req_get(dev, &dev->tx_idle)) || !dev->online));
734811 		if (!req) {
735812 			r = ret;
736813 			break;
....@@ -854,9 +931,7 @@
854931 	.read = acc_read,
855932 	.write = acc_write,
856933 	.unlocked_ioctl = acc_ioctl,
857
-#ifdef CONFIG_COMPAT
858934 	.compat_ioctl = acc_ioctl,
859
-#endif
860935 	.open = acc_open,
861936 	.release = acc_release,
862937 };
....@@ -926,6 +1001,7 @@
9261001 			value = 0;
9271002 			cdev->req->complete = acc_complete_setup_noop;
9281003 		} else if (b_request == ACCESSORY_SEND_STRING) {
1004
+			schedule_work(&dev->sendstring_work);
9291005 			dev->string_index = w_index;
9301006 			cdev->gadget->ep0->driver_data = dev;
9311007 			cdev->req->complete = acc_complete_set_string;
....@@ -972,6 +1048,7 @@
9721048 		}
9731049 	} else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
9741050 		if (b_request == ACCESSORY_GET_PROTOCOL) {
1051
+			schedule_work(&dev->getprotocol_work);
9751052 			*((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
9761053 			value = sizeof(u16);
9771054 			cdev->req->complete = acc_complete_setup_noop;
....@@ -1007,6 +1084,26 @@
10071084 	return value;
10081085 }
10091086 EXPORT_SYMBOL_GPL(acc_ctrlrequest);
1087
+
1088
+int acc_ctrlrequest_composite(struct usb_composite_dev *cdev,
1089
+			      const struct usb_ctrlrequest *ctrl)
1090
+{
1091
+	u16 w_length = le16_to_cpu(ctrl->wLength);
1092
+
1093
+	if (w_length > USB_COMP_EP0_BUFSIZ) {
1094
+		if (ctrl->bRequestType & USB_DIR_IN) {
1095
+			/* Cast away the const, we are going to overwrite on purpose. */
1096
+			__le16 *temp = (__le16 *)&ctrl->wLength;
1097
+
1098
+			*temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ);
1099
+			w_length = USB_COMP_EP0_BUFSIZ;
1100
+		} else {
1101
+			return -EINVAL;
1102
+		}
1103
+	}
1104
+	return acc_ctrlrequest(cdev, ctrl);
1105
+}
1106
+EXPORT_SYMBOL_GPL(acc_ctrlrequest_composite);
10101107 
10111108 static int
10121109 __acc_function_bind(struct usb_configuration *c,
....@@ -1048,12 +1145,22 @@
10481145 		return ret;
10491146 
10501147 	/* support high speed hardware */
1051
-	if (gadget_is_dualspeed(c->cdev->gadget)) {
1052
-		acc_highspeed_in_desc.bEndpointAddress =
1053
-			acc_fullspeed_in_desc.bEndpointAddress;
1054
-		acc_highspeed_out_desc.bEndpointAddress =
1055
-			acc_fullspeed_out_desc.bEndpointAddress;
1056
-	}
1148
+	acc_highspeed_in_desc.bEndpointAddress =
1149
+		acc_fullspeed_in_desc.bEndpointAddress;
1150
+	acc_highspeed_out_desc.bEndpointAddress =
1151
+		acc_fullspeed_out_desc.bEndpointAddress;
1152
+
1153
+	/* support super speed hardware */
1154
+	acc_superspeed_in_desc.bEndpointAddress =
1155
+		acc_fullspeed_in_desc.bEndpointAddress;
1156
+	acc_superspeed_out_desc.bEndpointAddress =
1157
+		acc_fullspeed_out_desc.bEndpointAddress;
1158
+
1159
+	/* support super speed plus hardware */
1160
+	acc_superspeedplus_in_desc.bEndpointAddress =
1161
+		acc_fullspeed_in_desc.bEndpointAddress;
1162
+	acc_superspeedplus_out_desc.bEndpointAddress =
1163
+		acc_fullspeed_out_desc.bEndpointAddress;
10571164 
10581165 	DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
10591166 			gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
....@@ -1116,6 +1223,20 @@
11161223 	}
11171224 
11181225 	acc_hid_unbind(dev);
1226
+}
1227
+
1228
+static void acc_getprotocol_work(struct work_struct *data)
1229
+{
1230
+	char *envp[2] = { "ACCESSORY=GETPROTOCOL", NULL };
1231
+
1232
+	kobject_uevent_env(&acc_device.this_device->kobj, KOBJ_CHANGE, envp);
1233
+}
1234
+
1235
+static void acc_sendstring_work(struct work_struct *data)
1236
+{
1237
+	char *envp[2] = { "ACCESSORY=SENDSTRING", NULL };
1238
+
1239
+	kobject_uevent_env(&acc_device.this_device->kobj, KOBJ_CHANGE, envp);
11191240 }
11201241 
11211242 static void acc_start_work(struct work_struct *data)
....@@ -1293,6 +1414,8 @@
12931414 	INIT_LIST_HEAD(&dev->dead_hid_list);
12941415 	INIT_DELAYED_WORK(&dev->start_work, acc_start_work);
12951416 	INIT_WORK(&dev->hid_work, acc_hid_work);
1417
+	INIT_WORK(&dev->getprotocol_work, acc_getprotocol_work);
1418
+	INIT_WORK(&dev->sendstring_work, acc_sendstring_work);
12961419 
12971420 	dev->ref = ref;
12981421 	if (cmpxchg_relaxed(&ref->acc_dev, NULL, dev)) {
....@@ -1436,6 +1559,8 @@
14361559 	dev->function.strings = acc_strings,
14371560 	dev->function.fs_descriptors = fs_acc_descs;
14381561 	dev->function.hs_descriptors = hs_acc_descs;
1562
+	dev->function.ss_descriptors = ss_acc_descs;
1563
+	dev->function.ssp_descriptors = ssp_acc_descs;
14391564 	dev->function.bind = acc_function_bind_configfs;
14401565 	dev->function.unbind = acc_function_unbind;
14411566 	dev->function.set_alt = acc_function_set_alt;