![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>
343 lines
7.3 KiB
C
343 lines
7.3 KiB
C
/*
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* multi.c -- Multifunction Composite driver
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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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* Copyright (C) 2009 Samsung Electronics
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* Author: Michal Nazarewicz (mina86@mina86.com)
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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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#if defined USB_ETH_RNDIS
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# undef USB_ETH_RNDIS
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#endif
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#ifdef CONFIG_USB_G_MULTI_RNDIS
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# define USB_ETH_RNDIS y
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#endif
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#define DRIVER_DESC "Multifunction Composite Gadget"
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Michal Nazarewicz");
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MODULE_LICENSE("GPL");
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/***************************** All the files... *****************************/
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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 "f_mass_storage.c"
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#include "u_serial.c"
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#include "f_acm.c"
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#include "f_ecm.c"
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#include "f_subset.c"
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#ifdef USB_ETH_RNDIS
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# include "f_rndis.c"
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# include "rndis.c"
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#endif
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#include "u_ether.c"
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USB_GADGET_COMPOSITE_OPTIONS();
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/***************************** Device Descriptor ****************************/
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#define MULTI_VENDOR_NUM 0x1d6b /* Linux Foundation */
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#define MULTI_PRODUCT_NUM 0x0104 /* Multifunction Composite Gadget */
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enum {
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__MULTI_NO_CONFIG,
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#ifdef CONFIG_USB_G_MULTI_RNDIS
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MULTI_RNDIS_CONFIG_NUM,
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#endif
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#ifdef CONFIG_USB_G_MULTI_CDC
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MULTI_CDC_CONFIG_NUM,
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#endif
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};
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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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/* Vendor and product id can be overridden by module parameters. */
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.idVendor = cpu_to_le16(MULTI_VENDOR_NUM),
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.idProduct = cpu_to_le16(MULTI_PRODUCT_NUM),
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};
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static const struct usb_descriptor_header *otg_desc[] = {
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(struct usb_descriptor_header *) &(struct usb_otg_descriptor){
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.bLength = sizeof(struct usb_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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NULL,
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};
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enum {
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MULTI_STRING_RNDIS_CONFIG_IDX = USB_GADGET_FIRST_AVAIL_IDX,
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MULTI_STRING_CDC_CONFIG_IDX,
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};
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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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[MULTI_STRING_RNDIS_CONFIG_IDX].s = "Multifunction with RNDIS",
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[MULTI_STRING_CDC_CONFIG_IDX].s = "Multifunction with CDC ECM",
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{ } /* end of list */
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};
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static struct usb_gadget_strings *dev_strings[] = {
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&(struct usb_gadget_strings){
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.language = 0x0409, /* en-us */
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.strings = strings_dev,
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},
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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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static u8 hostaddr[ETH_ALEN];
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/********** RNDIS **********/
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#ifdef USB_ETH_RNDIS
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static __init int rndis_do_config(struct usb_configuration *c)
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{
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int ret;
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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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ret = rndis_bind_config(c, hostaddr);
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if (ret < 0)
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return ret;
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ret = acm_bind_config(c, 0);
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if (ret < 0)
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return ret;
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ret = fsg_bind_config(c->cdev, c, &fsg_common);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int rndis_config_register(struct usb_composite_dev *cdev)
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{
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static struct usb_configuration config = {
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.bConfigurationValue = MULTI_RNDIS_CONFIG_NUM,
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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config.label = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].s;
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config.iConfiguration = strings_dev[MULTI_STRING_RNDIS_CONFIG_IDX].id;
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return usb_add_config(cdev, &config, rndis_do_config);
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}
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#else
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static int rndis_config_register(struct usb_composite_dev *cdev)
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{
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return 0;
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}
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#endif
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/********** CDC ECM **********/
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#ifdef CONFIG_USB_G_MULTI_CDC
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static __init int cdc_do_config(struct usb_configuration *c)
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{
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int ret;
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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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ret = ecm_bind_config(c, hostaddr);
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if (ret < 0)
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return ret;
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ret = acm_bind_config(c, 0);
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if (ret < 0)
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return ret;
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ret = fsg_bind_config(c->cdev, c, &fsg_common);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int cdc_config_register(struct usb_composite_dev *cdev)
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{
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static struct usb_configuration config = {
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.bConfigurationValue = MULTI_CDC_CONFIG_NUM,
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.bmAttributes = USB_CONFIG_ATT_SELFPOWER,
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};
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config.label = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].s;
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config.iConfiguration = strings_dev[MULTI_STRING_CDC_CONFIG_IDX].id;
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return usb_add_config(cdev, &config, cdc_do_config);
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}
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#else
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static int cdc_config_register(struct usb_composite_dev *cdev)
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{
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return 0;
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}
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#endif
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/****************************** Gadget Bind ******************************/
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static int __ref multi_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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if (!can_support_ecm(cdev->gadget)) {
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dev_err(&gadget->dev, "controller '%s' not usable\n",
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gadget->name);
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return -EINVAL;
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}
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/* set up network link layer */
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status = gether_setup(cdev->gadget, hostaddr);
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if (status < 0)
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return status;
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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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goto fail0;
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/* set up mass storage function */
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{
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void *retp;
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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 fail1;
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}
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}
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/* allocate string IDs */
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status = usb_string_ids_tab(cdev, strings_dev);
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if (unlikely(status < 0))
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goto fail2;
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device_desc.iProduct = strings_dev[USB_GADGET_PRODUCT_IDX].id;
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/* register configurations */
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status = rndis_config_register(cdev);
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if (unlikely(status < 0))
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goto fail2;
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status = cdc_config_register(cdev);
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if (unlikely(status < 0))
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goto fail2;
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usb_composite_overwrite_options(cdev, &coverwrite);
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/* we're done */
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dev_info(&gadget->dev, DRIVER_DESC "\n");
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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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fail2:
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fsg_common_put(&fsg_common);
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fail1:
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gserial_cleanup();
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fail0:
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gether_cleanup();
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return status;
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}
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static int __exit multi_unbind(struct usb_composite_dev *cdev)
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{
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gserial_cleanup();
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gether_cleanup();
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return 0;
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}
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/****************************** Some noise ******************************/
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static __refdata struct usb_composite_driver multi_driver = {
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.name = "g_multi",
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.dev = &device_desc,
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.strings = dev_strings,
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.max_speed = USB_SPEED_HIGH,
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.bind = multi_bind,
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.unbind = __exit_p(multi_unbind),
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.needs_serial = 1,
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};
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static int __init multi_init(void)
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{
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return usb_composite_probe(&multi_driver);
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}
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module_init(multi_init);
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static void __exit multi_exit(void)
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{
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usb_composite_unregister(&multi_driver);
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}
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module_exit(multi_exit);
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