usb: gadget: add new usb gadget for ACM and mass storage
This driver provides two functions in one configuration:
a mass storage, and a ACM (serial port) link.
Heavily based on multi.c and cdc2.c
Signed-off-by: Klaus Schwarzkopf <schwarzkopf@sensortherm.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index a60b472..b21cd37 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -873,6 +873,16 @@
It's only really useful for N900 hardware. If you're building
a kernel for N900, say Y or M here. If unsure, say N.
+config USB_G_ACM_MS
+ tristate "CDC Composite Device (ACM and mass storage)"
+ depends on BLOCK
+ help
+ This driver provides two functions in one configuration:
+ a mass storage, and a CDC ACM (serial port) link.
+
+ Say "y" to link the driver statically, or "m" to build a
+ dynamically linked module called "g_acm_ms".
+
config USB_G_MULTI
tristate "Multifunction Composite Gadget (EXPERIMENTAL)"
depends on BLOCK && NET
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index c36da63..b54ac61 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -51,6 +51,7 @@
g_nokia-y := nokia.o
g_webcam-y := webcam.o
g_ncm-y := ncm.o
+g_acm_ms-y := acm_ms.o
obj-$(CONFIG_USB_ZERO) += g_zero.o
obj-$(CONFIG_USB_AUDIO) += g_audio.o
@@ -69,3 +70,4 @@
obj-$(CONFIG_USB_G_NOKIA) += g_nokia.o
obj-$(CONFIG_USB_G_WEBCAM) += g_webcam.o
obj-$(CONFIG_USB_G_NCM) += g_ncm.o
+obj-$(CONFIG_USB_G_ACM_MS) += g_acm_ms.o
diff --git a/drivers/usb/gadget/acm_ms.c b/drivers/usb/gadget/acm_ms.c
new file mode 100644
index 0000000..fdb7aec
--- /dev/null
+++ b/drivers/usb/gadget/acm_ms.c
@@ -0,0 +1,256 @@
+/*
+ * acm_ms.c -- Composite driver, with ACM and mass storage support
+ *
+ * Copyright (C) 2008 David Brownell
+ * Copyright (C) 2008 Nokia Corporation
+ * Author: David Brownell
+ * Modified: Klaus Schwarzkopf <schwarzkopf@sensortherm.de>
+ *
+ * Heavily based on multi.c and cdc2.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/utsname.h>
+
+#include "u_serial.h"
+
+#define DRIVER_DESC "Composite Gadget (ACM + MS)"
+#define DRIVER_VERSION "2011/10/10"
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
+ * Instead: allocate your own, using normal USB-IF procedures.
+ */
+#define ACM_MS_VENDOR_NUM 0x1d6b /* Linux Foundation */
+#define ACM_MS_PRODUCT_NUM 0x0106 /* Composite Gadget: ACM + MS*/
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Kbuild is not very cooperative with respect to linking separately
+ * compiled library objects into one module. So for now we won't use
+ * separate compilation ... ensuring init/exit sections work to shrink
+ * the runtime footprint, and giving us at least some parts of what
+ * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
+ */
+
+#include "composite.c"
+#include "usbstring.c"
+#include "config.c"
+#include "epautoconf.c"
+#include "u_serial.c"
+#include "f_acm.c"
+#include "f_mass_storage.c"
+
+/*-------------------------------------------------------------------------*/
+
+static struct usb_device_descriptor device_desc = {
+ .bLength = sizeof device_desc,
+ .bDescriptorType = USB_DT_DEVICE,
+
+ .bcdUSB = cpu_to_le16(0x0200),
+
+ .bDeviceClass = USB_CLASS_MISC /* 0xEF */,
+ .bDeviceSubClass = 2,
+ .bDeviceProtocol = 1,
+
+ /* .bMaxPacketSize0 = f(hardware) */
+
+ /* Vendor and product id can be overridden by module parameters. */
+ .idVendor = cpu_to_le16(ACM_MS_VENDOR_NUM),
+ .idProduct = cpu_to_le16(ACM_MS_PRODUCT_NUM),
+ /* .bcdDevice = f(hardware) */
+ /* .iManufacturer = DYNAMIC */
+ /* .iProduct = DYNAMIC */
+ /* NO SERIAL NUMBER */
+ /*.bNumConfigurations = DYNAMIC*/
+};
+
+static struct usb_otg_descriptor otg_descriptor = {
+ .bLength = sizeof otg_descriptor,
+ .bDescriptorType = USB_DT_OTG,
+
+ /*
+ * REVISIT SRP-only hardware is possible, although
+ * it would not be called "OTG" ...
+ */
+ .bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
+};
+
+static const struct usb_descriptor_header *otg_desc[] = {
+ (struct usb_descriptor_header *) &otg_descriptor,
+ NULL,
+};
+
+
+/* string IDs are assigned dynamically */
+
+#define STRING_MANUFACTURER_IDX 0
+#define STRING_PRODUCT_IDX 1
+
+static char manufacturer[50];
+
+static struct usb_string strings_dev[] = {
+ [STRING_MANUFACTURER_IDX].s = manufacturer,
+ [STRING_PRODUCT_IDX].s = DRIVER_DESC,
+ { } /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_dev = {
+ .language = 0x0409, /* en-us */
+ .strings = strings_dev,
+};
+
+static struct usb_gadget_strings *dev_strings[] = {
+ &stringtab_dev,
+ NULL,
+};
+
+/****************************** Configurations ******************************/
+
+static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
+FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
+
+static struct fsg_common fsg_common;
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * We _always_ have both ACM and mass storage functions.
+ */
+static int __init acm_ms_do_config(struct usb_configuration *c)
+{
+ int status;
+
+ if (gadget_is_otg(c->cdev->gadget)) {
+ c->descriptors = otg_desc;
+ c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
+ }
+
+
+ status = acm_bind_config(c, 0);
+ if (status < 0)
+ return status;
+
+ status = fsg_bind_config(c->cdev, c, &fsg_common);
+ if (status < 0)
+ return status;
+
+ return 0;
+}
+
+static struct usb_configuration acm_ms_config_driver = {
+ .label = DRIVER_DESC,
+ .bConfigurationValue = 1,
+ /* .iConfiguration = DYNAMIC */
+ .bmAttributes = USB_CONFIG_ATT_SELFPOWER,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init acm_ms_bind(struct usb_composite_dev *cdev)
+{
+ int gcnum;
+ struct usb_gadget *gadget = cdev->gadget;
+ int status;
+ void *retp;
+
+ /* set up serial link layer */
+ status = gserial_setup(cdev->gadget, 1);
+ if (status < 0)
+ return status;
+
+ /* set up mass storage function */
+ retp = fsg_common_from_params(&fsg_common, cdev, &fsg_mod_data);
+ if (IS_ERR(retp)) {
+ status = PTR_ERR(retp);
+ goto fail0;
+ }
+
+ /* set bcdDevice */
+ gcnum = usb_gadget_controller_number(gadget);
+ if (gcnum >= 0) {
+ device_desc.bcdDevice = cpu_to_le16(0x0300 | gcnum);
+ } else {
+ WARNING(cdev, "controller '%s' not recognized; trying %s\n",
+ gadget->name,
+ acm_ms_config_driver.label);
+ device_desc.bcdDevice =
+ cpu_to_le16(0x0300 | 0x0099);
+ }
+
+ /*
+ * Allocate string descriptor numbers ... note that string
+ * contents can be overridden by the composite_dev glue.
+ */
+
+ /* device descriptor strings: manufacturer, product */
+ snprintf(manufacturer, sizeof manufacturer, "%s %s with %s",
+ init_utsname()->sysname, init_utsname()->release,
+ gadget->name);
+ status = usb_string_id(cdev);
+ if (status < 0)
+ goto fail1;
+ strings_dev[STRING_MANUFACTURER_IDX].id = status;
+ device_desc.iManufacturer = status;
+
+ status = usb_string_id(cdev);
+ if (status < 0)
+ goto fail1;
+ strings_dev[STRING_PRODUCT_IDX].id = status;
+ device_desc.iProduct = status;
+
+ /* register our configuration */
+ status = usb_add_config(cdev, &acm_ms_config_driver, acm_ms_do_config);
+ if (status < 0)
+ goto fail1;
+
+ dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
+ DRIVER_DESC);
+ fsg_common_put(&fsg_common);
+ return 0;
+
+ /* error recovery */
+fail1:
+ fsg_common_put(&fsg_common);
+fail0:
+ gserial_cleanup();
+ return status;
+}
+
+static int __exit acm_ms_unbind(struct usb_composite_dev *cdev)
+{
+ gserial_cleanup();
+
+ return 0;
+}
+
+static struct usb_composite_driver acm_ms_driver = {
+ .name = "g_acm_ms",
+ .dev = &device_desc,
+ .strings = dev_strings,
+ .unbind = __exit_p(acm_ms_unbind),
+};
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Klaus Schwarzkopf <schwarzkopf@sensortherm.de>");
+MODULE_LICENSE("GPL v2");
+
+static int __init init(void)
+{
+ return usb_composite_probe(&acm_ms_driver, acm_ms_bind);
+}
+module_init(init);
+
+static void __exit cleanup(void)
+{
+ usb_composite_unregister(&acm_ms_driver);
+}
+module_exit(cleanup);