/* * serial.c -- USB gadget serial driver * * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com) * Copyright (C) 2008 by David Brownell * Copyright (C) 2008 by Nokia Corporation * * This software is distributed under the terms of the GNU General * Public License ("GPL") as published by the Free Software Foundation, * either version 2 of that License or (at your option) any later version. */ #include <linux/kernel.h> #include <linux/utsname.h> #include <linux/device.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include "u_serial.h" #include "gadget_chips.h" /* Defines */ #define GS_VERSION_STR "v2.4" #define GS_VERSION_NUM 0x2400 #define GS_LONG_NAME "Gadget Serial" #define GS_VERSION_NAME GS_LONG_NAME " " GS_VERSION_STR /*-------------------------------------------------------------------------*/ /* Thanks to NetChip Technologies for donating this product ID. * * DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!! * Instead: allocate your own, using normal USB-IF procedures. */ #define GS_VENDOR_ID 0x0525 /* NetChip */ #define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */ #define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */ /* string IDs are assigned dynamically */ #define STRING_MANUFACTURER_IDX 0 #define STRING_PRODUCT_IDX 1 #define STRING_DESCRIPTION_IDX 2 static char manufacturer[50]; static struct usb_string strings_dev[] = { [STRING_MANUFACTURER_IDX].s = manufacturer, [STRING_PRODUCT_IDX].s = GS_VERSION_NAME, [STRING_DESCRIPTION_IDX].s = NULL /* updated; f(use_acm) */, { } /* 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, }; static struct usb_device_descriptor device_desc = { .bLength = USB_DT_DEVICE_SIZE, .bDescriptorType = USB_DT_DEVICE, .bcdUSB = __constant_cpu_to_le16(0x0200), /* .bDeviceClass = f(use_acm) */ .bDeviceSubClass = 0, .bDeviceProtocol = 0, /* .bMaxPacketSize0 = f(hardware) */ .idVendor = __constant_cpu_to_le16(GS_VENDOR_ID), /* .idProduct = f(use_acm) */ /* .bcdDevice = f(hardware) */ /* .iManufacturer = DYNAMIC */ /* .iProduct = DYNAMIC */ .bNumConfigurations = 1, }; 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, }; /*-------------------------------------------------------------------------*/ /* Module */ MODULE_DESCRIPTION(GS_VERSION_NAME); MODULE_AUTHOR("Al Borchers"); MODULE_AUTHOR("David Brownell"); MODULE_LICENSE("GPL"); static int use_acm = true; module_param(use_acm, bool, 0); MODULE_PARM_DESC(use_acm, "Use CDC ACM, default=yes"); static unsigned n_ports = 1; module_param(n_ports, uint, 0); MODULE_PARM_DESC(n_ports, "number of ports to create, default=1"); /*-------------------------------------------------------------------------*/ static int __init serial_bind_config(struct usb_configuration *c) { unsigned i; int status = 0; for (i = 0; i < n_ports && status == 0; i++) { if (use_acm) status = acm_bind_config(c, i); else status = gser_bind_config(c, i); } return status; } static struct usb_configuration serial_config_driver = { /* .label = f(use_acm) */ .bind = serial_bind_config, /* .bConfigurationValue = f(use_acm) */ /* .iConfiguration = DYNAMIC */ .bmAttributes = USB_CONFIG_ATT_SELFPOWER, .bMaxPower = 1, /* 2 mA, minimal */ }; static int __init gs_bind(struct usb_composite_dev *cdev) { int gcnum; struct usb_gadget *gadget = cdev->gadget; int status; status = gserial_setup(cdev->gadget, n_ports); if (status < 0) return status; /* Allocate string descriptor numbers ... note that string * contents can be overridden by the composite_dev glue. */ /* device description: 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 fail; strings_dev[STRING_MANUFACTURER_IDX].id = status; device_desc.iManufacturer = status; status = usb_string_id(cdev); if (status < 0) goto fail; strings_dev[STRING_PRODUCT_IDX].id = status; device_desc.iProduct = status; /* config description */ status = usb_string_id(cdev); if (status < 0) goto fail; strings_dev[STRING_DESCRIPTION_IDX].id = status; serial_config_driver.iConfiguration = status; /* set up other descriptors */ gcnum = usb_gadget_controller_number(gadget); if (gcnum >= 0) device_desc.bcdDevice = cpu_to_le16(GS_VERSION_NUM | gcnum); else { /* this is so simple (for now, no altsettings) that it * SHOULD NOT have problems with bulk-capable hardware. * so warn about unrcognized controllers -- don't panic. * * things like configuration and altsetting numbering * can need hardware-specific attention though. */ pr_warning("gs_bind: controller '%s' not recognized\n", gadget->name); device_desc.bcdDevice = __constant_cpu_to_le16(GS_VERSION_NUM | 0x0099); } if (gadget_is_otg(cdev->gadget)) { serial_config_driver.descriptors = otg_desc; serial_config_driver.bmAttributes |= USB_CONFIG_ATT_WAKEUP; } /* register our configuration */ status = usb_add_config(cdev, &serial_config_driver); if (status < 0) goto fail; INFO(cdev, "%s\n", GS_VERSION_NAME); return 0; fail: gserial_cleanup(); return status; } static struct usb_composite_driver gserial_driver = { .name = "g_serial", .dev = &device_desc, .strings = dev_strings, .bind = gs_bind, }; static int __init init(void) { /* We *could* export two configs; that'd be much cleaner... * but neither of these product IDs was defined that way. */ if (use_acm) { serial_config_driver.label = "CDC ACM config"; serial_config_driver.bConfigurationValue = 2; device_desc.bDeviceClass = USB_CLASS_COMM; device_desc.idProduct = __constant_cpu_to_le16(GS_CDC_PRODUCT_ID); } else { serial_config_driver.label = "Generic Serial config"; serial_config_driver.bConfigurationValue = 1; device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC; device_desc.idProduct = __constant_cpu_to_le16(GS_PRODUCT_ID); } strings_dev[STRING_DESCRIPTION_IDX].s = serial_config_driver.label; return usb_composite_register(&gserial_driver); } module_init(init); static void __exit cleanup(void) { usb_composite_unregister(&gserial_driver); gserial_cleanup(); } module_exit(cleanup);