2 * Configurable Composite Gadget
4 * Initially contributed as "Android Composite Gdaget" by:
6 * Copyright (C) 2008 Google, Inc.
7 * Author: Mike Lockwood <lockwood@android.com>
8 * Benoit Goby <benoit@android.com>
10 * Tailoring it to become a generic Configurable Composite Gadget is
12 * Copyright (C) 2012 Samsung Electronics
13 * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
15 * This software is licensed under the terms of the GNU General Public
16 * License version 2, as published by the Free Software Foundation, and
17 * may be copied, distributed, and modified under those terms.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
26 #include <linux/init.h>
27 #include <linux/module.h>
29 #include <linux/delay.h>
30 #include <linux/kernel.h>
31 #include <linux/utsname.h>
32 #include <linux/platform_device.h>
34 #include <linux/usb/ch9.h>
35 #include <linux/usb/composite.h>
36 #include <linux/usb/gadget.h>
38 #include "gadget_chips.h"
41 * Kbuild is not very cooperative with respect to linking separately
42 * compiled library objects into one module. So for now we won't use
43 * separate compilation ... ensuring init/exit sections work to shrink
44 * the runtime footprint, and giving us at least some parts of what
45 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
47 #include "../../usb/gadget/usbstring.c"
48 #include "../../usb/gadget/config.c"
49 #include "../../usb/gadget/epautoconf.c"
50 #include "../../usb/gadget/composite.c"
52 #include "../../usb/gadget/f_mass_storage.c"
53 #include "../../usb/gadget/u_serial.c"
54 #include "../../usb/gadget/f_acm.c"
55 #define USB_ETH_RNDIS y
56 #include "../../usb/gadget/f_rndis.c"
57 #include "../../usb/gadget/rndis.c"
58 #include "../../usb/gadget/u_ether.c"
59 #include "../../usb/gadget/f_fs.c"
61 MODULE_AUTHOR("Mike Lockwood, Andrzej Pietrasiewicz");
62 MODULE_DESCRIPTION("Configurable Composite USB Gadget");
63 MODULE_LICENSE("GPL");
64 MODULE_VERSION("1.0");
66 static const char longname[] = "Configurable Composite Gadget";
68 /* Default vendor and product IDs, overridden by userspace */
69 #define VENDOR_ID 0x1d6b /* Linux Foundation */
70 #define PRODUCT_ID 0x0107
71 #define GFS_MAX_DEVS 10
73 struct ccg_usb_function {
79 struct device_attribute **attributes;
81 /* for ccg_dev.enabled_functions */
82 struct list_head enabled_list;
84 /* Optional: initialization during gadget bind */
85 int (*init)(struct ccg_usb_function *, struct usb_composite_dev *);
86 /* Optional: cleanup during gadget unbind */
87 void (*cleanup)(struct ccg_usb_function *);
89 int (*bind_config)(struct ccg_usb_function *,
90 struct usb_configuration *);
92 /* Optional: called when the configuration is removed */
93 void (*unbind_config)(struct ccg_usb_function *,
94 struct usb_configuration *);
95 /* Optional: handle ctrl requests before the device is configured */
96 int (*ctrlrequest)(struct ccg_usb_function *,
97 struct usb_composite_dev *,
98 const struct usb_ctrlrequest *);
106 struct ffs_data *ffs_data;
110 struct ccg_usb_function **functions;
111 struct list_head enabled_functions;
112 struct usb_composite_dev *cdev;
119 struct work_struct work;
121 unsigned int max_func_num;
122 unsigned int func_num;
123 struct ffs_obj ffs_tab[GFS_MAX_DEVS];
126 static struct class *ccg_class;
127 static struct ccg_dev *_ccg_dev;
128 static int ccg_bind_config(struct usb_configuration *c);
129 static void ccg_unbind_config(struct usb_configuration *c);
131 static char func_names_buf[256];
133 static struct usb_device_descriptor device_desc = {
134 .bLength = sizeof(device_desc),
135 .bDescriptorType = USB_DT_DEVICE,
136 .bcdUSB = __constant_cpu_to_le16(0x0200),
137 .bDeviceClass = USB_CLASS_PER_INTERFACE,
138 .idVendor = __constant_cpu_to_le16(VENDOR_ID),
139 .idProduct = __constant_cpu_to_le16(PRODUCT_ID),
140 .bcdDevice = __constant_cpu_to_le16(0xffff),
141 .bNumConfigurations = 1,
144 static struct usb_configuration ccg_config_driver = {
146 .unbind = ccg_unbind_config,
147 .bConfigurationValue = 1,
148 .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
149 .bMaxPower = 0xFA, /* 500ma */
152 static void ccg_work(struct work_struct *data)
154 struct ccg_dev *dev = container_of(data, struct ccg_dev, work);
155 struct usb_composite_dev *cdev = dev->cdev;
156 static char *disconnected[2] = { "USB_STATE=DISCONNECTED", NULL };
157 static char *connected[2] = { "USB_STATE=CONNECTED", NULL };
158 static char *configured[2] = { "USB_STATE=CONFIGURED", NULL };
159 char **uevent_envp = NULL;
162 spin_lock_irqsave(&cdev->lock, flags);
164 uevent_envp = configured;
165 else if (dev->connected != dev->sw_connected)
166 uevent_envp = dev->connected ? connected : disconnected;
167 dev->sw_connected = dev->connected;
168 spin_unlock_irqrestore(&cdev->lock, flags);
171 kobject_uevent_env(&dev->dev->kobj, KOBJ_CHANGE, uevent_envp);
172 pr_info("%s: sent uevent %s\n", __func__, uevent_envp[0]);
174 pr_info("%s: did not send uevent (%d %d %p)\n", __func__,
175 dev->connected, dev->sw_connected, cdev->config);
180 /*-------------------------------------------------------------------------*/
181 /* Supported functions initialization */
183 static struct ffs_obj *functionfs_find_dev(struct ccg_dev *dev,
184 const char *dev_name)
188 for (i = 0; i < dev->max_func_num; i++)
189 if (strcmp(dev->ffs_tab[i].name, dev_name) == 0)
190 return &dev->ffs_tab[i];
195 static bool functionfs_all_ready(struct ccg_dev *dev)
199 for (i = 0; i < dev->max_func_num; i++)
200 if (dev->ffs_tab[i].used && !dev->ffs_tab[i].desc_ready)
206 static int functionfs_ready_callback(struct ffs_data *ffs)
208 struct ffs_obj *ffs_obj;
211 mutex_lock(&_ccg_dev->mutex);
213 ffs_obj = ffs->private_data;
218 if (WARN_ON(ffs_obj->desc_ready)) {
222 ffs_obj->ffs_data = ffs;
224 if (functionfs_all_ready(_ccg_dev)) {
228 ffs_obj->desc_ready = true;
231 mutex_unlock(&_ccg_dev->mutex);
235 static void reset_usb(struct ccg_dev *dev)
237 /* Cancel pending control requests */
238 usb_ep_dequeue(dev->cdev->gadget->ep0, dev->cdev->req);
239 usb_remove_config(dev->cdev, &ccg_config_driver);
240 dev->enabled = false;
241 usb_gadget_disconnect(dev->cdev->gadget);
244 static void functionfs_closed_callback(struct ffs_data *ffs)
246 struct ffs_obj *ffs_obj;
248 mutex_lock(&_ccg_dev->mutex);
250 ffs_obj = ffs->private_data;
254 ffs_obj->desc_ready = false;
256 if (_ccg_dev->enabled)
260 mutex_unlock(&_ccg_dev->mutex);
263 static void *functionfs_acquire_dev_callback(const char *dev_name)
265 struct ffs_obj *ffs_dev;
267 mutex_lock(&_ccg_dev->mutex);
269 ffs_dev = functionfs_find_dev(_ccg_dev, dev_name);
271 ffs_dev = ERR_PTR(-ENODEV);
275 if (ffs_dev->mounted) {
276 ffs_dev = ERR_PTR(-EBUSY);
279 ffs_dev->mounted = true;
282 mutex_unlock(&_ccg_dev->mutex);
286 static void functionfs_release_dev_callback(struct ffs_data *ffs_data)
288 struct ffs_obj *ffs_dev;
290 mutex_lock(&_ccg_dev->mutex);
292 ffs_dev = ffs_data->private_data;
294 ffs_dev->mounted = false;
296 mutex_unlock(&_ccg_dev->mutex);
299 static int functionfs_function_init(struct ccg_usb_function *f,
300 struct usb_composite_dev *cdev)
302 return functionfs_init();
305 static void functionfs_function_cleanup(struct ccg_usb_function *f)
307 functionfs_cleanup();
310 static int functionfs_function_bind_config(struct ccg_usb_function *f,
311 struct usb_configuration *c)
313 struct ccg_dev *dev = _ccg_dev;
316 for (i = dev->max_func_num; i--; ) {
317 if (!dev->ffs_tab[i].used)
319 ret = functionfs_bind(dev->ffs_tab[i].ffs_data, c->cdev);
320 if (unlikely(ret < 0)) {
321 while (++i < dev->max_func_num)
322 functionfs_unbind(dev->ffs_tab[i].ffs_data);
327 for (i = dev->max_func_num; i--; ) {
328 if (!dev->ffs_tab[i].used)
330 ret = functionfs_bind_config(c->cdev, c,
331 dev->ffs_tab[i].ffs_data);
332 if (unlikely(ret < 0))
339 static void functionfs_function_unbind_config(struct ccg_usb_function *f,
340 struct usb_configuration *c)
342 struct ccg_dev *dev = _ccg_dev;
345 for (i = dev->max_func_num; i--; )
346 if (dev->ffs_tab[i].ffs_data)
347 functionfs_unbind(dev->ffs_tab[i].ffs_data);
350 static ssize_t functionfs_user_functions_show(struct device *_dev,
351 struct device_attribute *attr,
354 struct ccg_dev *dev = _ccg_dev;
358 mutex_lock(&dev->mutex);
360 for (i = 0; i < dev->max_func_num; i++)
361 buff += snprintf(buff, PAGE_SIZE + buf - buff, "%s,",
362 dev->ffs_tab[i].name);
364 mutex_unlock(&dev->mutex);
371 static ssize_t functionfs_user_functions_store(struct device *_dev,
372 struct device_attribute *attr,
373 const char *buff, size_t size)
375 struct ccg_dev *dev = _ccg_dev;
380 buff = skip_spaces(buff);
384 mutex_lock(&dev->mutex);
391 for (i = 0; i < dev->max_func_num; i++)
392 if (dev->ffs_tab[i].mounted) {
397 strlcpy(func_names_buf, buff, sizeof(func_names_buf));
398 b = strim(func_names_buf);
400 /* replace the list of functions */
401 dev->max_func_num = 0;
403 name = strsep(&b, ",");
404 if (dev->max_func_num == GFS_MAX_DEVS) {
408 if (functionfs_find_dev(dev, name)) {
412 dev->ffs_tab[dev->max_func_num++].name = name;
416 mutex_unlock(&dev->mutex);
420 static DEVICE_ATTR(user_functions, S_IRUGO | S_IWUSR,
421 functionfs_user_functions_show,
422 functionfs_user_functions_store);
424 static ssize_t functionfs_max_user_functions_show(struct device *_dev,
425 struct device_attribute *attr,
428 return sprintf(buf, "%d", GFS_MAX_DEVS);
431 static DEVICE_ATTR(max_user_functions, S_IRUGO,
432 functionfs_max_user_functions_show, NULL);
434 static struct device_attribute *functionfs_function_attributes[] = {
435 &dev_attr_user_functions,
436 &dev_attr_max_user_functions,
440 static struct ccg_usb_function functionfs_function = {
442 .init = functionfs_function_init,
443 .cleanup = functionfs_function_cleanup,
444 .bind_config = functionfs_function_bind_config,
445 .unbind_config = functionfs_function_unbind_config,
446 .attributes = functionfs_function_attributes,
449 #define MAX_ACM_INSTANCES 4
450 struct acm_function_config {
455 acm_function_init(struct ccg_usb_function *f, struct usb_composite_dev *cdev)
457 f->config = kzalloc(sizeof(struct acm_function_config), GFP_KERNEL);
461 return gserial_setup(cdev->gadget, MAX_ACM_INSTANCES);
464 static void acm_function_cleanup(struct ccg_usb_function *f)
472 acm_function_bind_config(struct ccg_usb_function *f,
473 struct usb_configuration *c)
477 struct acm_function_config *config = f->config;
479 for (i = 0; i < config->instances; i++) {
480 ret = acm_bind_config(c, i);
482 pr_err("Could not bind acm%u config\n", i);
490 static ssize_t acm_instances_show(struct device *dev,
491 struct device_attribute *attr, char *buf)
493 struct ccg_usb_function *f = dev_get_drvdata(dev);
494 struct acm_function_config *config = f->config;
495 return sprintf(buf, "%d\n", config->instances);
498 static ssize_t acm_instances_store(struct device *dev,
499 struct device_attribute *attr, const char *buf, size_t size)
501 struct ccg_usb_function *f = dev_get_drvdata(dev);
502 struct acm_function_config *config = f->config;
506 ret = kstrtoint(buf, 10, &value);
510 if (value > MAX_ACM_INSTANCES)
513 config->instances = value;
518 static DEVICE_ATTR(instances, S_IRUGO | S_IWUSR, acm_instances_show,
519 acm_instances_store);
520 static struct device_attribute *acm_function_attributes[] = {
525 static struct ccg_usb_function acm_function = {
527 .init = acm_function_init,
528 .cleanup = acm_function_cleanup,
529 .bind_config = acm_function_bind_config,
530 .attributes = acm_function_attributes,
533 struct rndis_function_config {
534 u8 ethaddr[ETH_ALEN];
536 char manufacturer[256];
537 /* "Wireless" RNDIS; auto-detected by Windows */
541 static int rndis_function_init(struct ccg_usb_function *f,
542 struct usb_composite_dev *cdev)
544 f->config = kzalloc(sizeof(struct rndis_function_config), GFP_KERNEL);
550 static void rndis_function_cleanup(struct ccg_usb_function *f)
556 static int rndis_function_bind_config(struct ccg_usb_function *f,
557 struct usb_configuration *c)
560 struct rndis_function_config *rndis = f->config;
563 pr_err("%s: rndis_pdata\n", __func__);
567 pr_info("%s MAC: %02X:%02X:%02X:%02X:%02X:%02X\n", __func__,
568 rndis->ethaddr[0], rndis->ethaddr[1], rndis->ethaddr[2],
569 rndis->ethaddr[3], rndis->ethaddr[4], rndis->ethaddr[5]);
571 ret = gether_setup_name(c->cdev->gadget, rndis->ethaddr, "rndis");
573 pr_err("%s: gether_setup failed\n", __func__);
578 /* "Wireless" RNDIS; auto-detected by Windows */
579 rndis_iad_descriptor.bFunctionClass =
580 USB_CLASS_WIRELESS_CONTROLLER;
581 rndis_iad_descriptor.bFunctionSubClass = 0x01;
582 rndis_iad_descriptor.bFunctionProtocol = 0x03;
583 rndis_control_intf.bInterfaceClass =
584 USB_CLASS_WIRELESS_CONTROLLER;
585 rndis_control_intf.bInterfaceSubClass = 0x01;
586 rndis_control_intf.bInterfaceProtocol = 0x03;
589 return rndis_bind_config_vendor(c, rndis->ethaddr, rndis->vendorID,
590 rndis->manufacturer);
593 static void rndis_function_unbind_config(struct ccg_usb_function *f,
594 struct usb_configuration *c)
599 static ssize_t rndis_manufacturer_show(struct device *dev,
600 struct device_attribute *attr, char *buf)
602 struct ccg_usb_function *f = dev_get_drvdata(dev);
603 struct rndis_function_config *config = f->config;
604 return sprintf(buf, "%s\n", config->manufacturer);
607 static ssize_t rndis_manufacturer_store(struct device *dev,
608 struct device_attribute *attr, const char *buf, size_t size)
610 struct ccg_usb_function *f = dev_get_drvdata(dev);
611 struct rndis_function_config *config = f->config;
613 if (size >= sizeof(config->manufacturer))
615 memcpy(config->manufacturer, buf, size);
616 config->manufacturer[size] = 0;
621 static DEVICE_ATTR(manufacturer, S_IRUGO | S_IWUSR, rndis_manufacturer_show,
622 rndis_manufacturer_store);
624 static ssize_t rndis_wceis_show(struct device *dev,
625 struct device_attribute *attr, char *buf)
627 struct ccg_usb_function *f = dev_get_drvdata(dev);
628 struct rndis_function_config *config = f->config;
629 return sprintf(buf, "%d\n", config->wceis);
632 static ssize_t rndis_wceis_store(struct device *dev,
633 struct device_attribute *attr, const char *buf, size_t size)
635 struct ccg_usb_function *f = dev_get_drvdata(dev);
636 struct rndis_function_config *config = f->config;
640 ret = kstrtoint(buf, 10, &value);
644 config->wceis = value;
649 static DEVICE_ATTR(wceis, S_IRUGO | S_IWUSR, rndis_wceis_show,
652 static ssize_t rndis_ethaddr_show(struct device *dev,
653 struct device_attribute *attr, char *buf)
655 struct ccg_usb_function *f = dev_get_drvdata(dev);
656 struct rndis_function_config *rndis = f->config;
657 return sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x\n",
658 rndis->ethaddr[0], rndis->ethaddr[1], rndis->ethaddr[2],
659 rndis->ethaddr[3], rndis->ethaddr[4], rndis->ethaddr[5]);
662 static ssize_t rndis_ethaddr_store(struct device *dev,
663 struct device_attribute *attr, const char *buf, size_t size)
665 struct ccg_usb_function *f = dev_get_drvdata(dev);
666 struct rndis_function_config *rndis = f->config;
667 unsigned char tmp[6];
669 if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
670 tmp + 0, tmp + 1, tmp + 2, tmp + 3, tmp + 4, tmp + 5) !=
674 memcpy(rndis->ethaddr, tmp, ETH_ALEN);
680 static DEVICE_ATTR(ethaddr, S_IRUGO | S_IWUSR, rndis_ethaddr_show,
681 rndis_ethaddr_store);
683 static ssize_t rndis_vendorID_show(struct device *dev,
684 struct device_attribute *attr, char *buf)
686 struct ccg_usb_function *f = dev_get_drvdata(dev);
687 struct rndis_function_config *config = f->config;
688 return sprintf(buf, "%04x\n", config->vendorID);
691 static ssize_t rndis_vendorID_store(struct device *dev,
692 struct device_attribute *attr, const char *buf, size_t size)
694 struct ccg_usb_function *f = dev_get_drvdata(dev);
695 struct rndis_function_config *config = f->config;
699 ret = kstrtou32(buf, 16, &value);
703 config->vendorID = value;
708 static DEVICE_ATTR(vendorID, S_IRUGO | S_IWUSR, rndis_vendorID_show,
709 rndis_vendorID_store);
711 static struct device_attribute *rndis_function_attributes[] = {
712 &dev_attr_manufacturer,
719 static struct ccg_usb_function rndis_function = {
721 .init = rndis_function_init,
722 .cleanup = rndis_function_cleanup,
723 .bind_config = rndis_function_bind_config,
724 .unbind_config = rndis_function_unbind_config,
725 .attributes = rndis_function_attributes,
728 static int mass_storage_function_init(struct ccg_usb_function *f,
729 struct usb_composite_dev *cdev)
731 struct fsg_config fsg;
732 struct fsg_common *common;
735 memset(&fsg, 0, sizeof fsg);
737 fsg.luns[0].removable = 1;
738 fsg.vendor_name = iManufacturer;
739 fsg.product_name = iProduct;
741 common = fsg_common_init(NULL, cdev, &fsg);
743 return PTR_ERR(common);
745 err = sysfs_create_link(&f->dev->kobj,
746 &common->luns[0].dev.kobj,
749 fsg_common_put(common);
757 static void mass_storage_function_cleanup(struct ccg_usb_function *f)
759 fsg_common_put(f->config);
763 static int mass_storage_function_bind_config(struct ccg_usb_function *f,
764 struct usb_configuration *c)
766 struct fsg_common *common = f->config;
767 return fsg_bind_config(c->cdev, c, common);
770 static struct ccg_usb_function mass_storage_function = {
771 .name = "mass_storage",
772 .init = mass_storage_function_init,
773 .cleanup = mass_storage_function_cleanup,
774 .bind_config = mass_storage_function_bind_config,
777 static struct ccg_usb_function *supported_functions[] = {
778 &functionfs_function,
781 &mass_storage_function,
786 static int ccg_init_functions(struct ccg_usb_function **functions,
787 struct usb_composite_dev *cdev)
789 struct ccg_dev *dev = _ccg_dev;
790 struct ccg_usb_function *f;
791 struct device_attribute **attrs;
792 struct device_attribute *attr;
796 for (; (f = *functions++); index++) {
797 f->dev_name = kasprintf(GFP_KERNEL, "f_%s", f->name);
799 pr_err("%s: Failed to alloc name %s", __func__,
804 f->dev = device_create(ccg_class, dev->dev,
805 MKDEV(0, index), f, f->dev_name);
806 if (IS_ERR(f->dev)) {
807 pr_err("%s: Failed to create dev %s", __func__,
809 err = PTR_ERR(f->dev);
815 err = f->init(f, cdev);
817 pr_err("%s: Failed to init %s", __func__,
823 attrs = f->attributes;
825 while ((attr = *attrs++) && !err)
826 err = device_create_file(f->dev, attr);
829 pr_err("%s: Failed to create function %s attributes",
840 device_destroy(ccg_class, f->dev->devt);
848 static void ccg_cleanup_functions(struct ccg_usb_function **functions)
850 struct ccg_usb_function *f;
858 device_destroy(ccg_class, f->dev->devt);
864 static int ccg_bind_enabled_functions(struct ccg_dev *dev,
865 struct usb_configuration *c)
867 struct ccg_usb_function *f;
870 list_for_each_entry(f, &dev->enabled_functions, enabled_list) {
871 ret = f->bind_config(f, c);
873 pr_err("%s: %s failed", __func__, f->name);
880 static void ccg_unbind_enabled_functions(struct ccg_dev *dev,
881 struct usb_configuration *c)
883 struct ccg_usb_function *f;
885 list_for_each_entry(f, &dev->enabled_functions, enabled_list)
886 if (f->unbind_config)
887 f->unbind_config(f, c);
890 static int ccg_enable_function(struct ccg_dev *dev, char *name)
892 struct ccg_usb_function **functions = dev->functions;
893 struct ccg_usb_function *f;
894 while ((f = *functions++)) {
895 if (!strcmp(name, f->name)) {
896 list_add_tail(&f->enabled_list,
897 &dev->enabled_functions);
904 /*-------------------------------------------------------------------------*/
905 /* /sys/class/ccg_usb/ccg%d/ interface */
908 functions_show(struct device *pdev, struct device_attribute *attr, char *buf)
910 struct ccg_dev *dev = dev_get_drvdata(pdev);
911 struct ccg_usb_function *f;
915 mutex_lock(&dev->mutex);
917 list_for_each_entry(f, &dev->enabled_functions, enabled_list)
918 buff += sprintf(buff, "%s,", f->name);
919 for (i = 0; i < dev->max_func_num; i++)
920 if (dev->ffs_tab[i].used)
921 buff += sprintf(buff, "%s", dev->ffs_tab[i].name);
923 mutex_unlock(&dev->mutex);
931 functions_store(struct device *pdev, struct device_attribute *attr,
932 const char *buff, size_t size)
934 struct ccg_dev *dev = dev_get_drvdata(pdev);
938 bool functionfs_enabled;
940 buff = skip_spaces(buff);
944 mutex_lock(&dev->mutex);
947 mutex_unlock(&dev->mutex);
951 INIT_LIST_HEAD(&dev->enabled_functions);
952 functionfs_enabled = false;
953 for (i = 0; i < dev->max_func_num; i++)
954 dev->ffs_tab[i].used = false;
956 strlcpy(buf, buff, sizeof(buf));
960 struct ffs_obj *user_func;
962 name = strsep(&b, ",");
963 /* handle FunctionFS implicitly */
964 if (!strcmp(name, functionfs_function.name)) {
965 pr_err("ccg_usb: Cannot explicitly enable '%s'", name);
968 user_func = functionfs_find_dev(dev, name);
970 name = functionfs_function.name;
972 if (!user_func || !functionfs_enabled)
973 err = ccg_enable_function(dev, name);
975 pr_err("ccg_usb: Cannot enable '%s'", name);
976 else if (user_func) {
977 user_func->used = true;
979 functionfs_enabled = true;
983 mutex_unlock(&dev->mutex);
988 static ssize_t enable_show(struct device *pdev, struct device_attribute *attr,
991 struct ccg_dev *dev = dev_get_drvdata(pdev);
992 return sprintf(buf, "%d\n", dev->enabled);
995 static ssize_t enable_store(struct device *pdev, struct device_attribute *attr,
996 const char *buff, size_t size)
998 struct ccg_dev *dev = dev_get_drvdata(pdev);
999 struct usb_composite_dev *cdev = dev->cdev;
1002 mutex_lock(&dev->mutex);
1003 sscanf(buff, "%d", &enabled);
1004 if (enabled && dev->func_num && !functionfs_all_ready(dev)) {
1005 mutex_unlock(&dev->mutex);
1009 if (enabled && !dev->enabled) {
1012 cdev->next_string_id = 0;
1014 * Update values in composite driver's copy of
1015 * device descriptor.
1017 cdev->desc.bDeviceClass = device_desc.bDeviceClass;
1018 cdev->desc.bDeviceSubClass = device_desc.bDeviceSubClass;
1019 cdev->desc.bDeviceProtocol = device_desc.bDeviceProtocol;
1020 cdev->desc.idVendor = idVendor;
1021 cdev->desc.idProduct = idProduct;
1022 cdev->desc.bcdDevice = bcdDevice;
1024 usb_add_config(cdev, &ccg_config_driver, ccg_bind_config);
1025 dev->enabled = true;
1026 ret = usb_gadget_connect(cdev->gadget);
1028 dev->enabled = false;
1029 usb_remove_config(cdev, &ccg_config_driver);
1031 } else if (!enabled && dev->enabled) {
1034 pr_err("ccg_usb: already %s\n",
1035 dev->enabled ? "enabled" : "disabled");
1038 mutex_unlock(&dev->mutex);
1042 static ssize_t state_show(struct device *pdev, struct device_attribute *attr,
1045 struct ccg_dev *dev = dev_get_drvdata(pdev);
1046 struct usb_composite_dev *cdev = dev->cdev;
1047 char *state = "DISCONNECTED";
1048 unsigned long flags;
1053 spin_lock_irqsave(&cdev->lock, flags);
1055 state = "CONFIGURED";
1056 else if (dev->connected)
1057 state = "CONNECTED";
1058 spin_unlock_irqrestore(&cdev->lock, flags);
1060 return sprintf(buf, "%s\n", state);
1063 #define DESCRIPTOR_ATTR(field, format_string) \
1065 field ## _show(struct device *dev, struct device_attribute *attr, \
1068 return sprintf(buf, format_string, device_desc.field); \
1071 field ## _store(struct device *dev, struct device_attribute *attr, \
1072 const char *buf, size_t size) \
1075 if (sscanf(buf, format_string, &value) == 1) { \
1076 device_desc.field = value; \
1081 static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, field ## _show, field ## _store);
1083 DESCRIPTOR_ATTR(bDeviceClass, "%d\n")
1084 DESCRIPTOR_ATTR(bDeviceSubClass, "%d\n")
1085 DESCRIPTOR_ATTR(bDeviceProtocol, "%d\n")
1087 static DEVICE_ATTR(functions, S_IRUGO | S_IWUSR, functions_show,
1089 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store);
1090 static DEVICE_ATTR(state, S_IRUGO, state_show, NULL);
1092 static struct device_attribute *ccg_usb_attributes[] = {
1093 &dev_attr_bDeviceClass,
1094 &dev_attr_bDeviceSubClass,
1095 &dev_attr_bDeviceProtocol,
1096 &dev_attr_functions,
1102 /*-------------------------------------------------------------------------*/
1103 /* Composite driver */
1105 static int ccg_bind_config(struct usb_configuration *c)
1107 struct ccg_dev *dev = _ccg_dev;
1110 ret = ccg_bind_enabled_functions(dev, c);
1117 static void ccg_unbind_config(struct usb_configuration *c)
1119 struct ccg_dev *dev = _ccg_dev;
1121 ccg_unbind_enabled_functions(dev, c);
1123 usb_ep_autoconfig_reset(dev->cdev->gadget);
1126 static int ccg_bind(struct usb_composite_dev *cdev)
1128 struct ccg_dev *dev = _ccg_dev;
1129 struct usb_gadget *gadget = cdev->gadget;
1133 * Start disconnected. Userspace will connect the gadget once
1134 * it is done configuring the functions.
1136 usb_gadget_disconnect(gadget);
1138 ret = ccg_init_functions(dev->functions, cdev);
1142 gcnum = usb_gadget_controller_number(gadget);
1144 device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum);
1146 pr_warning("%s: controller '%s' not recognized\n",
1147 longname, gadget->name);
1148 device_desc.bcdDevice = __constant_cpu_to_le16(0x9999);
1151 usb_gadget_set_selfpowered(gadget);
1157 static int ccg_usb_unbind(struct usb_composite_dev *cdev)
1159 struct ccg_dev *dev = _ccg_dev;
1161 cancel_work_sync(&dev->work);
1162 ccg_cleanup_functions(dev->functions);
1166 static struct usb_composite_driver ccg_usb_driver = {
1167 .name = "configurable_usb",
1168 .dev = &device_desc,
1169 .unbind = ccg_usb_unbind,
1170 .needs_serial = true,
1171 .iManufacturer = "Linux Foundation",
1172 .iProduct = longname,
1173 .iSerialNumber = "1234567890123456",
1176 static int ccg_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *c)
1178 struct ccg_dev *dev = _ccg_dev;
1179 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1180 struct usb_request *req = cdev->req;
1181 struct ccg_usb_function *f;
1182 int value = -EOPNOTSUPP;
1183 unsigned long flags;
1186 req->complete = composite_setup_complete;
1188 gadget->ep0->driver_data = cdev;
1190 list_for_each_entry(f, &dev->enabled_functions, enabled_list) {
1191 if (f->ctrlrequest) {
1192 value = f->ctrlrequest(f, cdev, c);
1199 value = composite_setup(gadget, c);
1201 spin_lock_irqsave(&cdev->lock, flags);
1202 if (!dev->connected) {
1204 schedule_work(&dev->work);
1205 } else if (c->bRequest == USB_REQ_SET_CONFIGURATION &&
1207 schedule_work(&dev->work);
1209 spin_unlock_irqrestore(&cdev->lock, flags);
1214 static void ccg_disconnect(struct usb_gadget *gadget)
1216 struct ccg_dev *dev = _ccg_dev;
1217 struct usb_composite_dev *cdev = get_gadget_data(gadget);
1218 unsigned long flags;
1220 composite_disconnect(gadget);
1222 spin_lock_irqsave(&cdev->lock, flags);
1224 schedule_work(&dev->work);
1225 spin_unlock_irqrestore(&cdev->lock, flags);
1228 static int ccg_create_device(struct ccg_dev *dev)
1230 struct device_attribute **attrs = ccg_usb_attributes;
1231 struct device_attribute *attr;
1234 dev->dev = device_create(ccg_class, NULL, MKDEV(0, 0), NULL, "ccg0");
1235 if (IS_ERR(dev->dev))
1236 return PTR_ERR(dev->dev);
1238 dev_set_drvdata(dev->dev, dev);
1240 while ((attr = *attrs++)) {
1241 err = device_create_file(dev->dev, attr);
1243 device_destroy(ccg_class, dev->dev->devt);
1251 static int __init init(void)
1253 struct ccg_dev *dev;
1256 ccg_class = class_create(THIS_MODULE, "ccg_usb");
1257 if (IS_ERR(ccg_class))
1258 return PTR_ERR(ccg_class);
1260 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1264 dev->functions = supported_functions;
1265 INIT_LIST_HEAD(&dev->enabled_functions);
1266 INIT_WORK(&dev->work, ccg_work);
1267 mutex_init(&dev->mutex);
1269 err = ccg_create_device(dev);
1271 class_destroy(ccg_class);
1278 /* Override composite driver functions */
1279 composite_driver.setup = ccg_setup;
1280 composite_driver.disconnect = ccg_disconnect;
1282 err = usb_composite_probe(&ccg_usb_driver, ccg_bind);
1284 class_destroy(ccg_class);
1292 static void __exit cleanup(void)
1294 usb_composite_unregister(&ccg_usb_driver);
1295 class_destroy(ccg_class);
1299 module_exit(cleanup);