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hc
2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/drivers/rpmsg/rpmsg_core.c
....@@ -46,7 +46,7 @@
4646  * equals to the src address of their rpmsg channel), the driver's handler
4747  * is invoked to process it.
4848  *
49
- * That said, more complicated drivers might do need to allocate
49
+ * That said, more complicated drivers might need to allocate
5050  * additional rpmsg addresses, and bind them to different rx callbacks.
5151  * To accomplish that, those drivers need to call this function.
5252  *
....@@ -81,7 +81,7 @@
8181  */
8282 void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
8383 {
84
-	if (ept)
84
+	if (ept && ept->ops)
8585 		ept->ops->destroy_ept(ept);
8686 }
8787 EXPORT_SYMBOL(rpmsg_destroy_ept);
....@@ -177,7 +177,7 @@
177177 EXPORT_SYMBOL(rpmsg_send_offchannel);
178178 
179179 /**
180
- * rpmsg_send() - send a message across to the remote processor
180
+ * rpmsg_trysend() - send a message across to the remote processor
181181  * @ept: the rpmsg endpoint
182182  * @data: payload of message
183183  * @len: length of payload
....@@ -205,7 +205,7 @@
205205 EXPORT_SYMBOL(rpmsg_trysend);
206206 
207207 /**
208
- * rpmsg_sendto() - send a message across to the remote processor, specify dst
208
+ * rpmsg_trysendto() - send a message across to the remote processor, specify dst
209209  * @ept: the rpmsg endpoint
210210  * @data: payload of message
211211  * @len: length of payload
....@@ -253,7 +253,7 @@
253253 EXPORT_SYMBOL(rpmsg_poll);
254254 
255255 /**
256
- * rpmsg_send_offchannel() - send a message using explicit src/dst addresses
256
+ * rpmsg_trysend_offchannel() - send a message using explicit src/dst addresses
257257  * @ept: the rpmsg endpoint
258258  * @src: source address
259259  * @dst: destination address
....@@ -283,8 +283,67 @@
283283 }
284284 EXPORT_SYMBOL(rpmsg_trysend_offchannel);
285285 
286
+/**
287
+ * rpmsg_get_signals() - get the signals for this endpoint
288
+ * @ept:	the rpmsg endpoint
289
+ *
290
+ * Returns signal bits on success and an appropriate error value on failure.
291
+ */
292
+int rpmsg_get_signals(struct rpmsg_endpoint *ept)
293
+{
294
+	if (WARN_ON(!ept))
295
+		return -EINVAL;
296
+	if (!ept->ops->get_signals)
297
+		return -ENXIO;
298
+
299
+	return ept->ops->get_signals(ept);
300
+}
301
+EXPORT_SYMBOL(rpmsg_get_signals);
302
+
303
+/**
304
+ * rpmsg_set_signals() - set the remote signals for this endpoint
305
+ * @ept:	the rpmsg endpoint
306
+ * @set:	set mask for signals
307
+ * @clear:	clear mask for signals
308
+ *
309
+ * Returns 0 on success and an appropriate error value on failure.
310
+ */
311
+int rpmsg_set_signals(struct rpmsg_endpoint *ept, u32 set, u32 clear)
312
+{
313
+	if (WARN_ON(!ept))
314
+		return -EINVAL;
315
+	if (!ept->ops->set_signals)
316
+		return -ENXIO;
317
+
318
+	return ept->ops->set_signals(ept, set, clear);
319
+}
320
+EXPORT_SYMBOL(rpmsg_set_signals);
321
+
322
+#ifdef CONFIG_NO_GKI
323
+/**
324
+ * rpmsg_get_mtu() - get maximum transmission buffer size for sending message.
325
+ * @ept: the rpmsg endpoint
326
+ *
327
+ * This function returns maximum buffer size available for a single outgoing message.
328
+ *
329
+ * Return: the maximum transmission size on success and an appropriate error
330
+ * value on failure.
331
+ */
332
+
333
+ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept)
334
+{
335
+	if (WARN_ON(!ept))
336
+		return -EINVAL;
337
+	if (!ept->ops->get_mtu)
338
+		return -ENOTSUPP;
339
+
340
+	return ept->ops->get_mtu(ept);
341
+}
342
+EXPORT_SYMBOL(rpmsg_get_mtu);
343
+#endif
344
+
286345 /*
287
- * match an rpmsg channel with a channel info struct.
346
+ * match a rpmsg channel with a channel info struct.
288347  * this is used to make sure we're not creating rpmsg devices for channels
289348  * that already exist.
290349  */
....@@ -468,6 +527,10 @@
468527 
469528 		rpdev->ept = ept;
470529 		rpdev->src = ept->addr;
530
+
531
+		if (rpdrv->signals)
532
+			ept->sig_cb = rpdrv->signals;
533
+
471534 	}
472535 
473536 	err = rpdrv->probe(rpdev);
....@@ -505,7 +568,8 @@
505568 	if (rpdev->ops->announce_destroy)
506569 		err = rpdev->ops->announce_destroy(rpdev);
507570 
508
-	rpdrv->remove(rpdev);
571
+	if (rpdrv->remove)
572
+		rpdrv->remove(rpdev);
509573 
510574 	dev_pm_domain_detach(dev, true);
511575