usb: gadget: Multiple ACM gadget instances

- Added multiple ACM instance support in Android gadget
- Fixed multiple instance naming issue in ACM function
- Increased max instances from 4 to 8

Change-Id: I65f1b0be94da859bab7ec0ad7cd804b896c7c4c5
Signed-off-by: John Michelau <john.michelau@motorola.com>

drivers/usb/gadget/f_acm.c

@@ -698,6 +698,7 @@ acm_unbind(struct usb_configuration *c, struct usb_function *f)
 		usb_free_descriptors(f->hs_descriptors);
 	usb_free_descriptors(f->descriptors);
 	gs_free_req(acm->notify, acm->notify_req);
+	kfree(acm->port.func.name);
 	kfree(acm);
 }
 
@@ -769,7 +770,11 @@ int acm_bind_config(struct usb_configuration *c, u8 port_num)
 	acm->port.disconnect = acm_disconnect;
 	acm->port.send_break = acm_send_break;
 
-	acm->port.func.name = "acm";
+	acm->port.func.name = kasprintf(GFP_KERNEL, "acm%u", port_num);
+	if (!acm->port.func.name) {
+		kfree(acm);
+		return -ENOMEM;
+	}
 	acm->port.func.strings = acm_strings;
 	/* descriptors are per-instance copies */
 	acm->port.func.bind = acm_bind;
@@ -785,12 +790,38 @@ int acm_bind_config(struct usb_configuration *c, u8 port_num)
 }
 
 #ifdef CONFIG_USB_ANDROID_ACM
+#include <linux/platform_device.h>
+
+static struct acm_platform_data *acm_pdata;
+
+static int acm_probe(struct platform_device *pdev)
+{
+	acm_pdata = pdev->dev.platform_data;
+	return 0;
+}
+
+static struct platform_driver acm_platform_driver = {
+	.driver = { .name = "acm", },
+	.probe = acm_probe,
+};
 
 int acm_function_bind_config(struct usb_configuration *c)
 {
-	int ret = acm_bind_config(c, 0);
-	if (ret == 0)
-		gserial_setup(c->cdev->gadget, 1);
+	int i;
+	u8 num_inst = acm_pdata ? acm_pdata->num_inst : 1;
+	int ret = gserial_setup(c->cdev->gadget, num_inst);
+
+	if (ret)
+		return ret;
+
+	for (i = 0; i < num_inst; i++) {
+		ret = acm_bind_config(c, i);
+		if (ret) {
+			pr_err("Could not bind acm%u config\n", i);
+			break;
+		}
+	}
+
 	return ret;
 }
 
@@ -802,6 +833,7 @@ static struct android_usb_function acm_function = {
 static int __init init(void)
 {
 	printk(KERN_INFO "f_acm init\n");
+	platform_driver_register(&acm_platform_driver);
 	android_register_function(&acm_function);
 	return 0;
 }

drivers/usb/gadget/u_serial.c

@@ -122,7 +122,7 @@ struct gs_port {
 };
 
 /* increase N_PORTS if you need more */
-#define N_PORTS		4
+#define N_PORTS		8
 static struct portmaster {
 	struct mutex	lock;			/* protect open/close */
 	struct gs_port	*port;

include/linux/usb/android_composite.h

@@ -88,6 +88,11 @@ struct usb_ether_platform_data {
 	const char *vendorDescr;
 };
 
+/* Platform data for ACM driver. */
+struct acm_platform_data {
+	u8	num_inst;
+};
+
 extern void android_register_function(struct android_usb_function *f);
 
 extern void android_enable_function(struct usb_function *f, int enable);