276 lines
7.2 KiB
C
276 lines
7.2 KiB
C
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/*
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* File Name : multi_config.c
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*
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* Virtual multi configuration utilities for composite USB gadgets.
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* This utilitie can support variable interface for variable Host PC.
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*
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* Copyright (C) 2011 Samsung Electronics
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* Author: SoonYong, Cho <soonyong.cho@samsung.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include "multi_config.h"
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static int multi; /* current configuration */
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static int is_multi; /* Is multi configuration available ? */
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static int stringMode = OTHER_REQUEST;
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static int interfaceCount;
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/* Description : Set configuration number
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* Parameter : unsigned num (host request)
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* Return value : always return 0 (It's virtual multiconfiguration)
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*/
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unsigned set_config_number(unsigned num)
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{
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if (is_multi_configuration()) {
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USB_DBG_ESS("multi config_num=%d(zero base)\n", num);
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if (num < MAX_MULTI_CONFIG_NUM)
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multi = num; /* save config number from Host request */
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} else {
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USB_DBG_ESS("single config num=%d\n", num);
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multi = 0; /* single config */
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}
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return 0; /* always return 0 config */
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}
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/* Description : Get configuration number
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* Return value : virtual multiconfiguration number (zero base)
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*/
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int get_config_number(void)
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{
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USB_DBG("multi=%d\n", multi);
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return multi;
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}
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/* Description : Check configuration number
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* Parameter : unsigned num (host request)
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* Return value : 1 (true : virtual multi configuraiton)
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0 (false : normal configuration)
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*/
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int check_config(unsigned num)
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{
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USB_DBG("num=%d, multi=%d\n", num, multi);
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/* multi is zero base, but num is 1 ase */
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if (num && num == multi + 1) {
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USB_DBG("Use virtual multi configuration\n");
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return 1;
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} else {
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USB_DBG("normal configuration\n");
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return 0;
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}
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}
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/* Description : Search number of configuration including virtual configuration
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* Parameter : usb_configuration *c (referenced configuration)
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unsigned count (real number of configuration)
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* Return value : virtual or real number of configuration
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*/
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unsigned count_multi_config(struct usb_configuration *c, unsigned count)
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{
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int f_first = 0;
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int f_second = 0;
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int f_exception = 0;
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struct usb_function *f;
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is_multi = 0;
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if (!c) {
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USB_DBG("usb_configuration is not valid\n");
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return 0;
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}
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list_for_each_entry(f, &c->functions, list) {
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if (!strcmp(f->name, MULTI_FUNCTION_1)) {
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USB_DBG("%s +\n", MULTI_FUNCTION_1);
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f_first = 1;
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} else if (!strcmp(f->name, MULTI_FUNCTION_2)) {
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USB_DBG("%s +\n", MULTI_FUNCTION_2);
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f_second = 1;
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} else if (!strcmp(f->name, MULTI_EXCEPTION_FUNCTION) ||
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!strcmp(f->name, MULTI_EXCEPTION_FUNCTION_F_FS)) {
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USB_DBG("exception %s +\n", f->name );
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f_exception = 1;
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}
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}
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if (f_first && f_second && !f_exception) {
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USB_DBG_ESS("ready multi\n");
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is_multi = 1;
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return 2;
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}
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return count;
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}
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/* Description : Is multi configuration available ?
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* Return value : 1 (true), 0 (false)
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*/
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int is_multi_configuration(void)
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{
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USB_DBG("= %d\n", is_multi);
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return is_multi;
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}
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/* Description : Check function to skip for multi configuration
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* Parameter : char* name (function name)
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* Return value : 0 (not available), 1 (available)
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*/
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int is_available_function(const char *name)
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{
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if (is_multi_configuration()) {
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USB_DBG("multi case\n");
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if (!multi) {
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if (!strcmp(name, MAIN_FUNCTION)) {
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USB_DBG("%s is available.\n",
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MAIN_FUNCTION);
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return 1;
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}
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return 0; /* anothor function is not available */
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} else {
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USB_DBG("multi=%d all available\n", multi);
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}
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}
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return 1; /* if single configuration, every function is available */
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}
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/* Description : Change configuration using virtual multi configuration.
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* Parameter : struct usb_funciton f (to be changed function interface)
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void *next (next means usb req->buf)
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int len (length for to fill buffer)
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struct usb_configuration *config
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(To reference interface array of current config)
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enum usb_device_speed speed (usb speed)
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* Return value : "ret < 0" means fillbuffer function is failed.
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*/
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int change_conf(struct usb_function *f,
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void *next, int len,
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struct usb_configuration *config,
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enum usb_device_speed speed)
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{
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u8 *dest;
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int status = 0;
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struct usb_descriptor_header *descriptor;
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struct usb_interface_descriptor *intf;
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int index_intf = 0;
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int change_intf = 0;
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struct usb_descriptor_header **descriptors;
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if (!f || !config || !next) {
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USB_DBG_ESS("one of f, config, next is not valid\n");
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return -EFAULT;
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}
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USB_DBG("f->%s process multi\n", f->name);
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if (speed == USB_SPEED_HIGH)
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descriptors = f->hs_descriptors;
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else
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descriptors = f->fs_descriptors;
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if (!descriptors) {
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USB_DBG_ESS("descriptor is not available\n");
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return -EFAULT;
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}
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if (f->set_config_desc)
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f->set_config_desc(stringMode);
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/* set interface numbers dynamically */
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dest = next;
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while ((descriptor = *descriptors++) != NULL) {
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intf = (struct usb_interface_descriptor *)dest;
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if (intf->bDescriptorType == USB_DT_INTERFACE) {
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if (intf->bAlternateSetting == 0) {
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intf->bInterfaceNumber = interfaceCount++;
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USB_DBG("a=0 intf->bInterfaceNumber=%d\n",
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intf->bInterfaceNumber);
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} else {
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intf->bInterfaceNumber = interfaceCount - 1;
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USB_DBG("a!=0 intf->bInterfaceNumber=%d\n",
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intf->bInterfaceNumber);
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}
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config->interface
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[intf->bInterfaceNumber]
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= f;
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if (f->set_intf_num) {
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change_intf = 1;
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f->set_intf_num(f,
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intf->bInterfaceNumber,
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index_intf++);
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}
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}
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dest += intf->bLength;
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}
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if (change_intf) {
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if (speed == USB_SPEED_HIGH)
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descriptors = f->hs_descriptors;
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else
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descriptors = f->fs_descriptors;
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status = usb_descriptor_fillbuf(
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next, len,
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(const struct usb_descriptor_header **)
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descriptors);
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if (status < 0) {
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USB_DBG_ESS("usb_descriptor_fillbuf failed\n");
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return status;
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}
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}
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return status;
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}
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/* Description : Set interface count
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* Parameter : struct usb_configuration *config
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* (To reference interface array of current config)
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* struct usb_config_descriptor *c
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* (number of interfaces)
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* Return value : void
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*/
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void set_interface_count(struct usb_configuration *config,
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struct usb_config_descriptor *c)
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{
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USB_DBG_ESS("next_interface_id=%d\n", interfaceCount);
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config->next_interface_id = interfaceCount;
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config->interface[interfaceCount] = 0;
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c->bNumInterfaces = interfaceCount;
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interfaceCount = 0;
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return ;
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}
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/* Description : Set string mode
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* This mode will be used for deciding other interface.
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* Parameter : u16 w_length
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* - 2 means MAC request.
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* - Windows and Linux PC always request 255 size.
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*/
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void set_string_mode(u16 w_length)
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{
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if (w_length == 2) {
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USB_DBG("mac request\n");
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stringMode = MAC_REQUEST;
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} else if (w_length == 0) {
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USB_DBG("initialize string mode\n");
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stringMode = OTHER_REQUEST;
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}
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}
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/* Description : Get Host OS type
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* Return value : type - u16
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* - 0 : MAC PC
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* - 1 : Windows and Linux PC
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*/
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u16 get_host_os_type(void)
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{
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return stringMode;
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}
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