greybus: first cut at parsing svc messages sent to the AP

drivers/staging/greybus/ap.c

@@ -42,6 +42,12 @@ static struct svc_msg *convert_ap_message(struct ap_msg *ap_msg)
 	// for now, just cast the pointer and run away...
 
 	svc_msg = (struct svc_msg *)ap_msg->data;
+
+	// FIXME - put in correct version numbers
+	if ((svc_msg->header.version_major != 0x00) &&
+	    (svc_msg->header.version_minor != 0x00))
+		return NULL;
+
 	return svc_msg;
 }
 

drivers/staging/greybus/es1-ap-usb.c

@@ -11,6 +11,7 @@
 #include <linux/errno.h>
 #include <linux/usb.h>
 #include "greybus.h"
+#include "svc_msg.h"
 
 static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(0xffff, 0x0001) },		// FIXME
@@ -81,6 +82,124 @@ static void free_gbuf(struct gbuf *gbuf)
 	kfree(buffer);
 }
 
+static struct svc_msg *svc_msg_alloc(enum svc_function_type type)
+{
+	struct svc_msg *svc_msg;
+
+	svc_msg = kzalloc((sizeof *svc_msg), GFP_KERNEL);
+	if (!svc_msg)
+		return NULL;
+
+	// FIXME - verify we are only sending message types we should be
+	svc_msg->header.type = type;
+	return svc_msg;
+}
+
+static void svc_msg_free(struct svc_msg *svc_msg)
+{
+	kfree(svc_msg);
+}
+
+static int svc_msg_send(struct svc_msg *svc_msg)
+{
+	// FIXME - Do something with this message!
+
+
+	svc_msg_free(svc_msg);
+	return 0;
+}
+
+
+static void svc_handshake(struct svc_function_handshake *handshake,
+			  struct es1_ap_dev *es1)
+{
+	struct svc_msg *svc_msg;
+
+	/* A new SVC communication channel, let's verify it was for us */
+	if (handshake->handshake_type != SVC_HANDSHAKE_SVC_HELLO) {
+		/* we don't know what to do with this, log it and return */
+		dev_dbg(&es1->usb_intf->dev,
+			"received invalid handshake type %d\n",
+			handshake->handshake_type);
+		return;
+	}
+
+	/* Send back a AP_HELLO message */
+	svc_msg = svc_msg_alloc(SVC_FUNCTION_HANDSHAKE);
+	if (!svc_msg)
+		return;
+
+	svc_msg->handshake.handshake_type = SVC_HANDSHAKE_AP_HELLO;
+	svc_msg_send(svc_msg);
+}
+
+static void svc_management(struct svc_function_unipro_management *management,
+			   struct es1_ap_dev *es1)
+{
+	/* What?  An AP should not get this message */
+	dev_err(&es1->usb_intf->dev, "Got an svc management message???\n");
+}
+
+static void svc_hotplug(struct svc_function_hotplug *hotplug,
+			struct es1_ap_dev *es1)
+{
+	u8 module_id = hotplug->module_id;
+
+	switch (hotplug->hotplug_event) {
+	case SVC_HOTPLUG_EVENT:
+		dev_dbg(&es1->usb_intf->dev, "module id %d added\n",
+			module_id);
+		// FIXME - add the module to the system
+		break;
+
+	case SVC_HOTUNPLUG_EVENT:
+		dev_dbg(&es1->usb_intf->dev, "module id %d removed\n",
+			module_id);
+		// FIXME - remove the module from the system
+		break;
+
+	default:
+		dev_err(&es1->usb_intf->dev, "received invalid hotplug message type %d\n",
+			hotplug->hotplug_event);
+		break;
+	}
+}
+
+static void svc_ddb(struct svc_function_ddb *ddb, struct es1_ap_dev *es1)
+{
+	/* What?  An AP should not get this message */
+	dev_err(&es1->usb_intf->dev, "Got an svc DDB message???\n");
+}
+
+static void svc_power(struct svc_function_power *power, struct es1_ap_dev *es1)
+{
+	u8 module_id = power->module_id;
+
+	if (power->power_type != SVC_POWER_BATTERY_STATUS) {
+		dev_err(&es1->usb_intf->dev, "received invalid power type %d\n",
+			power->power_type);
+		return;
+	}
+
+	dev_dbg(&es1->usb_intf->dev, "power status for module id %d is %d\n",
+		module_id, power->status.status);
+
+	// FIXME - do something with the power information, like update our
+	// battery information...
+}
+
+static void svc_epm(struct svc_function_epm *epm, struct es1_ap_dev *es1)
+{
+	/* What?  An AP should not get this message */
+	dev_err(&es1->usb_intf->dev, "Got an EPM message???\n");
+}
+
+static void svc_suspend(struct svc_function_suspend *suspend,
+			struct es1_ap_dev *es1)
+{
+	/* What?  An AP should not get this message */
+	dev_err(&es1->usb_intf->dev, "Got an suspend message???\n");
+}
 
 /* Main message loop for ap messages */
 /* Odds are, most of this logic can move to core.c someday, but as we only have
@@ -90,8 +209,32 @@ static void ap_msg(struct svc_msg *svc_msg, struct greybus_host_device *hd)
 	struct es1_ap_dev *es1 = hd_to_es1(hd);
 
 	/* Look at the message to figure out what to do with it */
-
-
+	switch (svc_msg->header.type) {
+	case SVC_FUNCTION_HANDSHAKE:
+		svc_handshake(&svc_msg->handshake, es1);
+		break;
+	case SVC_FUNCTION_UNIPRO_NETWORK_MANAGEMENT:
+		svc_management(&svc_msg->management, es1);
+		break;
+	case SVC_FUNCTION_HOTPLUG:
+		svc_hotplug(&svc_msg->hotplug, es1);
+		break;
+	case SVC_FUNCTION_DDB:
+		svc_ddb(&svc_msg->ddb, es1);
+		break;
+	case SVC_FUNCTION_POWER:
+		svc_power(&svc_msg->power, es1);
+		break;
+	case SVC_FUNCTION_EPM:
+		svc_epm(&svc_msg->epm, es1);
+		break;
+	case SVC_FUNCTION_SUSPEND:
+		svc_suspend(&svc_msg->suspend, es1);
+		break;
+	default:
+		dev_err(&es1->usb_intf->dev, "received invalid SVC message type %d\n",
+			svc_msg->header.type);
+	}
 }