![Sebastian Andrzej Siewior](/assets/img/avatar_default.png)
The bcdDevice field is defined as |Device release number in binary-coded decimal in the USB 2.0 specification. We use this field to distinguish the UDCs from each other. In theory this could be used on the host side to apply certain quirks if the "special" UDC in combination with this gadget is used. This hasn't been done as far as I am aware. In practice it would be better to fix the UDC driver before shipping since a later release might not need this quirk anymore. There are some driver in tree (on the host side) which use the bcdDevice field to figure out special workarounds for a given firmware revision. This seems to make sense. Therefore this patch converts all gadgets (except a few) to use the kernel version instead a random 2 or 3 plus the UDC number. The few that don't report kernel's version are: - webcam This one reports always a version 0x10 so allow it to do so in future. - nokia This one reports always 0x211. The comment says that this gadget works only if the UDC supports altsettings so I added a check for this. - serial This one reports 0x2400 + UDC number. Since the gadget version is 2.4 this could make sense. Therefore bcdDevice is 0x2400 here. I also remove various gadget_is_<name> macros which are unused. The remaining few macros should be moved to feature / bug bitfield. Acked-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Felipe Balbi <balbi@ti.com>
227 lines
5.8 KiB
C
227 lines
5.8 KiB
C
/*
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* acm_ms.c -- Composite driver, with ACM and mass storage support
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*
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* Copyright (C) 2008 David Brownell
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* Copyright (C) 2008 Nokia Corporation
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* Author: David Brownell
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* Modified: Klaus Schwarzkopf <schwarzkopf@sensortherm.de>
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*
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* Heavily based on multi.c and cdc2.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "u_serial.h"
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#define DRIVER_DESC "Composite Gadget (ACM + MS)"
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#define DRIVER_VERSION "2011/10/10"
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/*-------------------------------------------------------------------------*/
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/*
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* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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#define ACM_MS_VENDOR_NUM 0x1d6b /* Linux Foundation */
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#define ACM_MS_PRODUCT_NUM 0x0106 /* Composite Gadget: ACM + MS*/
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/*-------------------------------------------------------------------------*/
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/*
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* Kbuild is not very cooperative with respect to linking separately
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* compiled library objects into one module. So for now we won't use
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* separate compilation ... ensuring init/exit sections work to shrink
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* the runtime footprint, and giving us at least some parts of what
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* a "gcc --combine ... part1.c part2.c part3.c ... " build would.
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*/
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#include "u_serial.c"
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#include "f_acm.c"
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#include "f_mass_storage.c"
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/*-------------------------------------------------------------------------*/
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USB_GADGET_COMPOSITE_OPTIONS();
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static struct usb_device_descriptor device_desc = {
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.bLength = sizeof device_desc,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = cpu_to_le16(0x0200),
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.bDeviceClass = USB_CLASS_MISC /* 0xEF */,
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.bDeviceSubClass = 2,
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.bDeviceProtocol = 1,
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/* .bMaxPacketSize0 = f(hardware) */
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/* Vendor and product id can be overridden by module parameters. */
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.idVendor = cpu_to_le16(ACM_MS_VENDOR_NUM),
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.idProduct = cpu_to_le16(ACM_MS_PRODUCT_NUM),
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/* .bcdDevice = f(hardware) */
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/* .iManufacturer = DYNAMIC */
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/* .iProduct = DYNAMIC */
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/* NO SERIAL NUMBER */
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/*.bNumConfigurations = DYNAMIC*/
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};
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static struct usb_otg_descriptor otg_descriptor = {
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.bLength = sizeof otg_descriptor,
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.bDescriptorType = USB_DT_OTG,
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/*
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* REVISIT SRP-only hardware is possible, although
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* it would not be called "OTG" ...
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*/
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.bmAttributes = USB_OTG_SRP | USB_OTG_HNP,
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &otg_descriptor,
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NULL,
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};
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/* string IDs are assigned dynamically */
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static struct usb_string strings_dev[] = {
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[USB_GADGET_MANUFACTURER_IDX].s = "",
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[USB_GADGET_PRODUCT_IDX].s = DRIVER_DESC,
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[USB_GADGET_SERIAL_IDX].s = "",
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{ } /* end of list */
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};
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static struct usb_gadget_strings stringtab_dev = {
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&stringtab_dev,
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NULL,
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};
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/****************************** Configurations ******************************/
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static struct fsg_module_parameters fsg_mod_data = { .stall = 1 };
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FSG_MODULE_PARAMETERS(/* no prefix */, fsg_mod_data);
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static struct fsg_common fsg_common;
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/*-------------------------------------------------------------------------*/
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/*
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* We _always_ have both ACM and mass storage functions.
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*/
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static int __init acm_ms_do_config(struct usb_configuration *c)
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{
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int status;
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if (gadget_is_otg(c->cdev->gadget)) {
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c->descriptors = otg_desc;
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c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
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}
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status = acm_bind_config(c, 0);
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if (status < 0)
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return status;
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status = fsg_bind_config(c->cdev, c, &fsg_common);
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if (status < 0)
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return status;
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return 0;
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}
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static struct usb_configuration acm_ms_config_driver = {
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.label = DRIVER_DESC,
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.bConfigurationValue = 1,
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/* .iConfiguration = DYNAMIC */
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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/*-------------------------------------------------------------------------*/
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static int __init acm_ms_bind(struct usb_composite_dev *cdev)
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{
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struct usb_gadget *gadget = cdev->gadget;
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int status;
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void *retp;
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/* set up serial link layer */
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status = gserial_setup(cdev->gadget, 1);
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if (status < 0)
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return status;
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/* set up mass storage function */
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retp = fsg_common_from_params(&fsg_common, cdev, &fsg_mod_data);
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if (IS_ERR(retp)) {
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status = PTR_ERR(retp);
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goto fail0;
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}
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/*
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* Allocate string descriptor numbers ... note that string
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* contents can be overridden by the composite_dev glue.
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*/
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status = usb_string_ids_tab(cdev, strings_dev);
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if (status < 0)
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goto fail1;
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device_desc.iManufacturer = strings_dev[USB_GADGET_MANUFACTURER_IDX].id;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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/* register our configuration */
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status = usb_add_config(cdev, &acm_ms_config_driver, acm_ms_do_config);
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if (status < 0)
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goto fail1;
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usb_composite_overwrite_options(cdev, &coverwrite);
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dev_info(&gadget->dev, "%s, version: " DRIVER_VERSION "\n",
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DRIVER_DESC);
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fsg_common_put(&fsg_common);
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return 0;
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/* error recovery */
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fail1:
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fsg_common_put(&fsg_common);
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fail0:
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gserial_cleanup();
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return status;
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}
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static int __exit acm_ms_unbind(struct usb_composite_dev *cdev)
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{
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gserial_cleanup();
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return 0;
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}
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static __refdata struct usb_composite_driver acm_ms_driver = {
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.name = "g_acm_ms",
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.dev = &device_desc,
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.max_speed = USB_SPEED_SUPER,
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.strings = dev_strings,
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.bind = acm_ms_bind,
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.unbind = __exit_p(acm_ms_unbind),
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};
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Klaus Schwarzkopf <schwarzkopf@sensortherm.de>");
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MODULE_LICENSE("GPL v2");
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static int __init init(void)
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{
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return usb_composite_probe(&acm_ms_driver);
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}
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module_init(init);
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static void __exit cleanup(void)
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{
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usb_composite_unregister(&acm_ms_driver);
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}
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module_exit(cleanup);
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