diff options
Diffstat (limited to 'drivers/staging/ccg/ccg.c')
| -rw-r--r-- | drivers/staging/ccg/ccg.c | 1292 |
1 files changed, 0 insertions, 1292 deletions
diff --git a/drivers/staging/ccg/ccg.c b/drivers/staging/ccg/ccg.c deleted file mode 100644 index ffc5f73a5b5b..000000000000 --- a/drivers/staging/ccg/ccg.c +++ /dev/null @@ -1,1292 +0,0 @@ -/* - * Configurable Composite Gadget - * - * Initially contributed as "Android Composite Gdaget" by: - * - * Copyright (C) 2008 Google, Inc. - * Author: Mike Lockwood <lockwood@android.com> - * Benoit Goby <benoit@android.com> - * - * Tailoring it to become a generic Configurable Composite Gadget is - * - * Copyright (C) 2012 Samsung Electronics - * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com> - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/fs.h> -#include <linux/delay.h> -#include <linux/kernel.h> -#include <linux/utsname.h> -#include <linux/platform_device.h> - -#include <linux/usb/ch9.h> -#include "composite.h" -#include <linux/usb/gadget.h> - -#include "gadget_chips.h" - -/* - * Kbuild is not very cooperative with respect to linking separately - * compiled library objects into one module. So for now we won't use - * separate compilation ... ensuring init/exit sections work to shrink - * the runtime footprint, and giving us at least some parts of what - * a "gcc --combine ... part1.c part2.c part3.c ... " build would. - */ -#include "usbstring.c" -#include "config.c" -#include "epautoconf.c" -#include "composite.c" - -#include "f_mass_storage.c" -#include "u_serial.c" -#include "f_acm.c" -#define USB_ETH_RNDIS y -#include "f_rndis.c" -#include "rndis.c" -#include "u_ether.c" -#include "f_fs.c" - -MODULE_AUTHOR("Mike Lockwood, Andrzej Pietrasiewicz"); -MODULE_DESCRIPTION("Configurable Composite USB Gadget"); -MODULE_LICENSE("GPL"); -MODULE_VERSION("1.0"); - -static const char longname[] = "Configurable Composite Gadget"; - -/* Default vendor and product IDs, overridden by userspace */ -#define VENDOR_ID 0x1d6b /* Linux Foundation */ -#define PRODUCT_ID 0x0107 -#define GFS_MAX_DEVS 10 - -struct ccg_usb_function { - char *name; - void *config; - - struct device *dev; - char *dev_name; - struct device_attribute **attributes; - - /* for ccg_dev.enabled_functions */ - struct list_head enabled_list; - - /* Optional: initialization during gadget bind */ - int (*init)(struct ccg_usb_function *, struct usb_composite_dev *); - /* Optional: cleanup during gadget unbind */ - void (*cleanup)(struct ccg_usb_function *); - - int (*bind_config)(struct ccg_usb_function *, - struct usb_configuration *); - - /* Optional: called when the configuration is removed */ - void (*unbind_config)(struct ccg_usb_function *, - struct usb_configuration *); - /* Optional: handle ctrl requests before the device is configured */ - int (*ctrlrequest)(struct ccg_usb_function *, - struct usb_composite_dev *, - const struct usb_ctrlrequest *); -}; - -struct ffs_obj { - const char *name; - bool mounted; - bool desc_ready; - bool used; - struct ffs_data *ffs_data; -}; - -struct ccg_dev { - struct ccg_usb_function **functions; - struct list_head enabled_functions; - struct usb_composite_dev *cdev; - struct device *dev; - - bool enabled; - struct mutex mutex; - bool connected; - bool sw_connected; - struct work_struct work; - - unsigned int max_func_num; - unsigned int func_num; - struct ffs_obj ffs_tab[GFS_MAX_DEVS]; -}; - -static struct class *ccg_class; -static struct ccg_dev *_ccg_dev; -static int ccg_bind_config(struct usb_configuration *c); -static void ccg_unbind_config(struct usb_configuration *c); - -static char func_names_buf[256]; - -static struct usb_device_descriptor device_desc = { - .bLength = sizeof(device_desc), - .bDescriptorType = USB_DT_DEVICE, - .bcdUSB = __constant_cpu_to_le16(0x0200), - .bDeviceClass = USB_CLASS_PER_INTERFACE, - .idVendor = __constant_cpu_to_le16(VENDOR_ID), - .idProduct = __constant_cpu_to_le16(PRODUCT_ID), - .bcdDevice = __constant_cpu_to_le16(0xffff), - .bNumConfigurations = 1, -}; - -static struct usb_configuration ccg_config_driver = { - .label = "ccg", - .unbind = ccg_unbind_config, - .bConfigurationValue = 1, - .bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER, - .bMaxPower = 0xFA, /* 500ma */ -}; - -static void ccg_work(struct work_struct *data) -{ - struct ccg_dev *dev = container_of(data, struct ccg_dev, work); - struct usb_composite_dev *cdev = dev->cdev; - static char *disconnected[2] = { "USB_STATE=DISCONNECTED", NULL }; - static char *connected[2] = { "USB_STATE=CONNECTED", NULL }; - static char *configured[2] = { "USB_STATE=CONFIGURED", NULL }; - char **uevent_envp = NULL; - unsigned long flags; - - spin_lock_irqsave(&cdev->lock, flags); - if (cdev->config) - uevent_envp = configured; - else if (dev->connected != dev->sw_connected) - uevent_envp = dev->connected ? connected : disconnected; - dev->sw_connected = dev->connected; - spin_unlock_irqrestore(&cdev->lock, flags); - - if (uevent_envp) { - kobject_uevent_env(&dev->dev->kobj, KOBJ_CHANGE, uevent_envp); - pr_info("%s: sent uevent %s\n", __func__, uevent_envp[0]); - } else { - pr_info("%s: did not send uevent (%d %d %p)\n", __func__, - dev->connected, dev->sw_connected, cdev->config); - } -} - - -/*-------------------------------------------------------------------------*/ -/* Supported functions initialization */ - -static struct ffs_obj *functionfs_find_dev(struct ccg_dev *dev, - const char *dev_name) -{ - int i; - - for (i = 0; i < dev->max_func_num; i++) - if (strcmp(dev->ffs_tab[i].name, dev_name) == 0) - return &dev->ffs_tab[i]; - - return NULL; -} - -static bool functionfs_all_ready(struct ccg_dev *dev) -{ - int i; - - for (i = 0; i < dev->max_func_num; i++) - if (dev->ffs_tab[i].used && !dev->ffs_tab[i].desc_ready) - return false; - - return true; -} - -static int functionfs_ready_callback(struct ffs_data *ffs) -{ - struct ffs_obj *ffs_obj; - int ret; - - mutex_lock(&_ccg_dev->mutex); - - ffs_obj = ffs->private_data; - if (!ffs_obj) { - ret = -EINVAL; - goto done; - } - if (WARN_ON(ffs_obj->desc_ready)) { - ret = -EBUSY; - goto done; - } - ffs_obj->ffs_data = ffs; - - if (functionfs_all_ready(_ccg_dev)) { - ret = -EBUSY; - goto done; - } - ffs_obj->desc_ready = true; - -done: - mutex_unlock(&_ccg_dev->mutex); - return ret; -} - -static void reset_usb(struct ccg_dev *dev) -{ - /* Cancel pending control requests */ - usb_ep_dequeue(dev->cdev->gadget->ep0, dev->cdev->req); - usb_remove_config(dev->cdev, &ccg_config_driver); - dev->enabled = false; - usb_gadget_disconnect(dev->cdev->gadget); -} - -static void functionfs_closed_callback(struct ffs_data *ffs) -{ - struct ffs_obj *ffs_obj; - - mutex_lock(&_ccg_dev->mutex); - - ffs_obj = ffs->private_data; - if (!ffs_obj) - goto done; - - ffs_obj->desc_ready = false; - - if (_ccg_dev->enabled) - reset_usb(_ccg_dev); - -done: - mutex_unlock(&_ccg_dev->mutex); -} - -static void *functionfs_acquire_dev_callback(const char *dev_name) -{ - struct ffs_obj *ffs_dev; - - mutex_lock(&_ccg_dev->mutex); - - ffs_dev = functionfs_find_dev(_ccg_dev, dev_name); - if (!ffs_dev) { - ffs_dev = ERR_PTR(-ENODEV); - goto done; - } - - if (ffs_dev->mounted) { - ffs_dev = ERR_PTR(-EBUSY); - goto done; - } - ffs_dev->mounted = true; - -done: - mutex_unlock(&_ccg_dev->mutex); - return ffs_dev; -} - -static void functionfs_release_dev_callback(struct ffs_data *ffs_data) -{ - struct ffs_obj *ffs_dev; - - mutex_lock(&_ccg_dev->mutex); - - ffs_dev = ffs_data->private_data; - if (ffs_dev) - ffs_dev->mounted = false; - - mutex_unlock(&_ccg_dev->mutex); -} - -static int functionfs_function_init(struct ccg_usb_function *f, - struct usb_composite_dev *cdev) -{ - return functionfs_init(); -} - -static void functionfs_function_cleanup(struct ccg_usb_function *f) -{ - functionfs_cleanup(); -} - -static int functionfs_function_bind_config(struct ccg_usb_function *f, - struct usb_configuration *c) -{ - struct ccg_dev *dev = _ccg_dev; - int i, ret; - - for (i = dev->max_func_num; i--; ) { - if (!dev->ffs_tab[i].used) - continue; - ret = functionfs_bind(dev->ffs_tab[i].ffs_data, c->cdev); - if (unlikely(ret < 0)) { - while (++i < dev->max_func_num) - functionfs_unbind(dev->ffs_tab[i].ffs_data); - return ret; - } - } - - for (i = dev->max_func_num; i--; ) { - if (!dev->ffs_tab[i].used) - continue; - ret = functionfs_bind_config(c->cdev, c, - dev->ffs_tab[i].ffs_data); - if (unlikely(ret < 0)) - return ret; - } - - return 0; -} - -static void functionfs_function_unbind_config(struct ccg_usb_function *f, - struct usb_configuration *c) -{ - struct ccg_dev *dev = _ccg_dev; - int i; - - for (i = dev->max_func_num; i--; ) - if (dev->ffs_tab[i].ffs_data) - functionfs_unbind(dev->ffs_tab[i].ffs_data); -} - -static ssize_t functionfs_user_functions_show(struct device *_dev, - struct device_attribute *attr, - char *buf) -{ - struct ccg_dev *dev = _ccg_dev; - char *buff = buf; - int i; - - mutex_lock(&dev->mutex); - - for (i = 0; i < dev->max_func_num; i++) - buff += snprintf(buff, PAGE_SIZE + buf - buff, "%s,", - dev->ffs_tab[i].name); - - mutex_unlock(&dev->mutex); - - if (buff != buf) - *(buff - 1) = '\n'; - return buff - buf; -} - -static ssize_t functionfs_user_functions_store(struct device *_dev, - struct device_attribute *attr, - const char *buff, size_t size) -{ - struct ccg_dev *dev = _ccg_dev; - char *name, *b; - ssize_t ret = size; - int i; - - buff = skip_spaces(buff); - if (!*buff) - return -EINVAL; - - mutex_lock(&dev->mutex); - - if (dev->enabled) { - ret = -EBUSY; - goto end; - } - - for (i = 0; i < dev->max_func_num; i++) - if (dev->ffs_tab[i].mounted) { - ret = -EBUSY; - goto end; - } - - strlcpy(func_names_buf, buff, sizeof(func_names_buf)); - b = strim(func_names_buf); - - /* replace the list of functions */ - dev->max_func_num = 0; - while (b) { - name = strsep(&b, ","); - if (dev->max_func_num == GFS_MAX_DEVS) { - ret = -ENOSPC; - goto end; - } - if (functionfs_find_dev(dev, name)) { - ret = -EEXIST; - continue; - } - dev->ffs_tab[dev->max_func_num++].name = name; - } - -end: - mutex_unlock(&dev->mutex); - return ret; -} - -static DEVICE_ATTR(user_functions, S_IRUGO | S_IWUSR, - functionfs_user_functions_show, - functionfs_user_functions_store); - -static ssize_t functionfs_max_user_functions_show(struct device *_dev, - struct device_attribute *attr, - char *buf) -{ - return sprintf(buf, "%d", GFS_MAX_DEVS); -} - -static DEVICE_ATTR(max_user_functions, S_IRUGO, - functionfs_max_user_functions_show, NULL); - -static struct device_attribute *functionfs_function_attributes[] = { - &dev_attr_user_functions, - &dev_attr_max_user_functions, - NULL -}; - -static struct ccg_usb_function functionfs_function = { - .name = "fs", - .init = functionfs_function_init, - .cleanup = functionfs_function_cleanup, - .bind_config = functionfs_function_bind_config, - .unbind_config = functionfs_function_unbind_config, - .attributes = functionfs_function_attributes, -}; - -#define MAX_ACM_INSTANCES 4 -struct acm_function_config { - int instances; -}; - -static int -acm_function_init(struct ccg_usb_function *f, struct usb_composite_dev *cdev) -{ - f->config = kzalloc(sizeof(struct acm_function_config), GFP_KERNEL); - if (!f->config) - return -ENOMEM; - - return gserial_setup(cdev->gadget, MAX_ACM_INSTANCES); -} - -static void acm_function_cleanup(struct ccg_usb_function *f) -{ - gserial_cleanup(); - kfree(f->config); - f->config = NULL; -} - -static int -acm_function_bind_config(struct ccg_usb_function *f, - struct usb_configuration *c) -{ - int i; - int ret = 0; - struct acm_function_config *config = f->config; - - for (i = 0; i < config->instances; i++) { - ret = acm_bind_config(c, i); - if (ret) { - pr_err("Could not bind acm%u config\n", i); - break; - } - } - - return ret; -} - -static ssize_t acm_instances_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct acm_function_config *config = f->config; - return sprintf(buf, "%d\n", config->instances); -} - -static ssize_t acm_instances_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct acm_function_config *config = f->config; - int value; - int ret = 0; - - ret = kstrtoint(buf, 10, &value); - if (ret) - return ret; - - if (value > MAX_ACM_INSTANCES) - return -EINVAL; - - config->instances = value; - - return size; -} - -static DEVICE_ATTR(instances, S_IRUGO | S_IWUSR, acm_instances_show, - acm_instances_store); -static struct device_attribute *acm_function_attributes[] = { - &dev_attr_instances, - NULL -}; - -static struct ccg_usb_function acm_function = { - .name = "acm", - .init = acm_function_init, - .cleanup = acm_function_cleanup, - .bind_config = acm_function_bind_config, - .attributes = acm_function_attributes, -}; - -struct rndis_function_config { - u8 ethaddr[ETH_ALEN]; - u32 vendorID; - char manufacturer[256]; - /* "Wireless" RNDIS; auto-detected by Windows */ - bool wceis; -}; - -static int rndis_function_init(struct ccg_usb_function *f, - struct usb_composite_dev *cdev) -{ - f->config = kzalloc(sizeof(struct rndis_function_config), GFP_KERNEL); - if (!f->config) - return -ENOMEM; - return 0; -} - -static void rndis_function_cleanup(struct ccg_usb_function *f) -{ - kfree(f->config); - f->config = NULL; -} - -static int rndis_function_bind_config(struct ccg_usb_function *f, - struct usb_configuration *c) -{ - int ret; - struct rndis_function_config *rndis = f->config; - - if (!rndis) { - pr_err("%s: rndis_pdata\n", __func__); - return -1; - } - - pr_info("%s MAC: %pM\n", __func__, rndis->ethaddr); - - ret = gether_setup_name(c->cdev->gadget, rndis->ethaddr, "rndis"); - if (ret) { - pr_err("%s: gether_setup failed\n", __func__); - return ret; - } - - if (rndis->wceis) { - /* "Wireless" RNDIS; auto-detected by Windows */ - rndis_iad_descriptor.bFunctionClass = - USB_CLASS_WIRELESS_CONTROLLER; - rndis_iad_descriptor.bFunctionSubClass = 0x01; - rndis_iad_descriptor.bFunctionProtocol = 0x03; - rndis_control_intf.bInterfaceClass = - USB_CLASS_WIRELESS_CONTROLLER; - rndis_control_intf.bInterfaceSubClass = 0x01; - rndis_control_intf.bInterfaceProtocol = 0x03; - } - - return rndis_bind_config_vendor(c, rndis->ethaddr, rndis->vendorID, - rndis->manufacturer); -} - -static void rndis_function_unbind_config(struct ccg_usb_function *f, - struct usb_configuration *c) -{ - gether_cleanup(); -} - -static ssize_t rndis_manufacturer_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *config = f->config; - return sprintf(buf, "%s\n", config->manufacturer); -} - -static ssize_t rndis_manufacturer_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *config = f->config; - - if (size >= sizeof(config->manufacturer)) - return -EINVAL; - memcpy(config->manufacturer, buf, size); - config->manufacturer[size] = 0; - - return size; -} - -static DEVICE_ATTR(manufacturer, S_IRUGO | S_IWUSR, rndis_manufacturer_show, - rndis_manufacturer_store); - -static ssize_t rndis_wceis_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *config = f->config; - return sprintf(buf, "%d\n", config->wceis); -} - -static ssize_t rndis_wceis_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *config = f->config; - int value; - int ret; - - ret = kstrtoint(buf, 10, &value); - if (ret) - return ret; - - config->wceis = value; - - return size; -} - -static DEVICE_ATTR(wceis, S_IRUGO | S_IWUSR, rndis_wceis_show, - rndis_wceis_store); - -static ssize_t rndis_ethaddr_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *rndis = f->config; - return sprintf(buf, "%pM\n", rndis->ethaddr); -} - -static ssize_t rndis_ethaddr_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *rndis = f->config; - unsigned char tmp[6]; - - if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", - tmp + 0, tmp + 1, tmp + 2, tmp + 3, tmp + 4, tmp + 5) != - ETH_ALEN) - return -EINVAL; - - memcpy(rndis->ethaddr, tmp, ETH_ALEN); - - return ETH_ALEN; - -} - -static DEVICE_ATTR(ethaddr, S_IRUGO | S_IWUSR, rndis_ethaddr_show, - rndis_ethaddr_store); - -static ssize_t rndis_vendorID_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *config = f->config; - return sprintf(buf, "%04x\n", config->vendorID); -} - -static ssize_t rndis_vendorID_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t size) -{ - struct ccg_usb_function *f = dev_get_drvdata(dev); - struct rndis_function_config *config = f->config; - int value; - int ret; - - ret = kstrtou32(buf, 16, &value); - if (ret) - return ret; - - config->vendorID = value; - - return size; -} - -static DEVICE_ATTR(vendorID, S_IRUGO | S_IWUSR, rndis_vendorID_show, - rndis_vendorID_store); - -static struct device_attribute *rndis_function_attributes[] = { - &dev_attr_manufacturer, - &dev_attr_wceis, - &dev_attr_ethaddr, - &dev_attr_vendorID, - NULL -}; - -static struct ccg_usb_function rndis_function = { - .name = "rndis", - .init = rndis_function_init, - .cleanup = rndis_function_cleanup, - .bind_config = rndis_function_bind_config, - .unbind_config = rndis_function_unbind_config, - .attributes = rndis_function_attributes, -}; - -static int mass_storage_function_init(struct ccg_usb_function *f, - struct usb_composite_dev *cdev) -{ - struct fsg_config fsg; - struct fsg_common *common; - int err; - - memset(&fsg, 0, sizeof(fsg)); - fsg.nluns = 1; - fsg.luns[0].removable = 1; - fsg.vendor_name = iManufacturer; - fsg.product_name = iProduct; - - common = fsg_common_init(NULL, cdev, &fsg); - if (IS_ERR(common)) - return PTR_ERR(common); - - err = sysfs_create_link(&f->dev->kobj, - &common->luns[0].dev.kobj, - "lun"); - if (err) { - fsg_common_put(common); - return err; - } - - f->config = common; - return 0; -} - -static void mass_storage_function_cleanup(struct ccg_usb_function *f) -{ - fsg_common_put(f->config); - f->config = NULL; -} - -static int mass_storage_function_bind_config(struct ccg_usb_function *f, - struct usb_configuration *c) -{ - struct fsg_common *common = f->config; - return fsg_bind_config(c->cdev, c, common); -} - -static struct ccg_usb_function mass_storage_function = { - .name = "mass_storage", - .init = mass_storage_function_init, - .cleanup = mass_storage_function_cleanup, - .bind_config = mass_storage_function_bind_config, -}; - -static struct ccg_usb_function *supported_functions[] = { - &functionfs_function, - &acm_function, - &rndis_function, - &mass_storage_function, - NULL -}; - - -static int ccg_init_functions(struct ccg_usb_function **functions, - struct usb_composite_dev *cdev) -{ - struct ccg_dev *dev = _ccg_dev; - struct ccg_usb_function *f; - struct device_attribute **attrs; - struct device_attribute *attr; - int err; - int index = 0; - - for (; (f = *functions++); index++) { - f->dev_name = kasprintf(GFP_KERNEL, "f_%s", f->name); - if (!f->dev_name) { - pr_err("%s: Failed to alloc name %s", __func__, - f->name); - err = -ENOMEM; - goto err_alloc; - } - f->dev = device_create(ccg_class, dev->dev, - MKDEV(0, index), f, f->dev_name); - if (IS_ERR(f->dev)) { - pr_err("%s: Failed to create dev %s", __func__, - f->dev_name); - err = PTR_ERR(f->dev); - f->dev = NULL; - goto err_create; - } - - if (f->init) { - err = f->init(f, cdev); - if (err) { - pr_err("%s: Failed to init %s", __func__, - f->name); - goto err_out; - } - } - - attrs = f->attributes; - if (attrs) { - while ((attr = *attrs++) && !err) - err = device_create_file(f->dev, attr); - } - if (err) { - pr_err("%s: Failed to create function %s attributes", - __func__, f->name); - goto err_uninit; - } - } - return 0; - -err_uninit: - if (f->cleanup) - f->cleanup(f); -err_out: - device_destroy(ccg_class, f->dev->devt); - f->dev = NULL; -err_create: - kfree(f->dev_name); -err_alloc: - return err; -} - -static void ccg_cleanup_functions(struct ccg_usb_function **functions) -{ - struct ccg_usb_function *f; - - while (*functions) { - f = *functions++; - - if (f->dev) { - if (f->cleanup) - f->cleanup(f); - device_destroy(ccg_class, f->dev->devt); - kfree(f->dev_name); - } - } -} - -static int ccg_bind_enabled_functions(struct ccg_dev *dev, - struct usb_configuration *c) -{ - struct ccg_usb_function *f; - int ret; - - list_for_each_entry(f, &dev->enabled_functions, enabled_list) { - ret = f->bind_config(f, c); - if (ret) { - pr_err("%s: %s failed", __func__, f->name); - return ret; - } - } - return 0; -} - -static void ccg_unbind_enabled_functions(struct ccg_dev *dev, - struct usb_configuration *c) -{ - struct ccg_usb_function *f; - - list_for_each_entry(f, &dev->enabled_functions, enabled_list) - if (f->unbind_config) - f->unbind_config(f, c); -} - -static int ccg_enable_function(struct ccg_dev *dev, char *name) -{ - struct ccg_usb_function **functions = dev->functions; - struct ccg_usb_function *f; - while ((f = *functions++)) { - if (!strcmp(name, f->name)) { - list_add_tail(&f->enabled_list, - &dev->enabled_functions); - return 0; - } - } - return -EINVAL; -} - -/*-------------------------------------------------------------------------*/ -/* /sys/class/ccg_usb/ccg%d/ interface */ - -static ssize_t -functions_show(struct device *pdev, struct device_attribute *attr, char *buf) -{ - struct ccg_dev *dev = dev_get_drvdata(pdev); - struct ccg_usb_function *f; - char *buff = buf; - int i; - - mutex_lock(&dev->mutex); - - list_for_each_entry(f, &dev->enabled_functions, enabled_list) - buff += sprintf(buff, "%s,", f->name); - for (i = 0; i < dev->max_func_num; i++) - if (dev->ffs_tab[i].used) - buff += sprintf(buff, "%s", dev->ffs_tab[i].name); - - mutex_unlock(&dev->mutex); - - if (buff != buf) - *(buff-1) = '\n'; - return buff - buf; -} - -static ssize_t -functions_store(struct device *pdev, struct device_attribute *attr, - const char *buff, size_t size) -{ - struct ccg_dev *dev = dev_get_drvdata(pdev); - char *name; - char buf[256], *b; - int err, i; - bool functionfs_enabled; - - buff = skip_spaces(buff); - if (!*buff) - return -EINVAL; - - mutex_lock(&dev->mutex); - - if (dev->enabled) { - mutex_unlock(&dev->mutex); - return -EBUSY; - } - - INIT_LIST_HEAD(&dev->enabled_functions); - functionfs_enabled = false; - for (i = 0; i < dev->max_func_num; i++) - dev->ffs_tab[i].used = false; - - strlcpy(buf, buff, sizeof(buf)); - b = strim(buf); - - while (b) { - struct ffs_obj *user_func; - - name = strsep(&b, ","); - /* handle FunctionFS implicitly */ - if (!strcmp(name, functionfs_function.name)) { - pr_err("ccg_usb: Cannot explicitly enable '%s'", name); - continue; - } - user_func = functionfs_find_dev(dev, name); - if (user_func) - name = functionfs_function.name; - err = 0; - if (!user_func || !functionfs_enabled) - err = ccg_enable_function(dev, name); - if (err) - pr_err("ccg_usb: Cannot enable '%s'", name); - else if (user_func) { - user_func->used = true; - dev->func_num++; - functionfs_enabled = true; - } - } - - mutex_unlock(&dev->mutex); - - return size; -} - -static ssize_t enable_show(struct device *pdev, struct device_attribute *attr, - char *buf) -{ - struct ccg_dev *dev = dev_get_drvdata(pdev); - return sprintf(buf, "%d\n", dev->enabled); -} - -static ssize_t enable_store(struct device *pdev, struct device_attribute *attr, - const char *buff, size_t size) -{ - struct ccg_dev *dev = dev_get_drvdata(pdev); - struct usb_composite_dev *cdev = dev->cdev; - int enabled = 0; - - mutex_lock(&dev->mutex); - sscanf(buff, "%d", &enabled); - if (enabled && dev->func_num && !functionfs_all_ready(dev)) { - mutex_unlock(&dev->mutex); - return -ENODEV; - } - - if (enabled && !dev->enabled) { - int ret; - - cdev->next_string_id = 0; - /* - * Update values in composite driver's copy of - * device descriptor. - */ - cdev->desc.bDeviceClass = device_desc.bDeviceClass; - cdev->desc.bDeviceSubClass = device_desc.bDeviceSubClass; - cdev->desc.bDeviceProtocol = device_desc.bDeviceProtocol; - cdev->desc.idVendor = idVendor; - cdev->desc.idProduct = idProduct; - cdev->desc.bcdDevice = bcdDevice; - - usb_add_config(cdev, &ccg_config_driver, ccg_bind_config); - dev->enabled = true; - ret = usb_gadget_connect(cdev->gadget); - if (ret) { - dev->enabled = false; - usb_remove_config(cdev, &ccg_config_driver); - } - } else if (!enabled && dev->enabled) { - reset_usb(dev); - } else { - pr_err("ccg_usb: already %s\n", - dev->enabled ? "enabled" : "disabled"); - } - - mutex_unlock(&dev->mutex); - return size; -} - -static ssize_t state_show(struct device *pdev, struct device_attribute *attr, - char *buf) -{ - struct ccg_dev *dev = dev_get_drvdata(pdev); - struct usb_composite_dev *cdev = dev->cdev; - char *state = "DISCONNECTED"; - unsigned long flags; - - if (!cdev) - goto out; - - spin_lock_irqsave(&cdev->lock, flags); - if (cdev->config) - state = "CONFIGURED"; - else if (dev->connected) - state = "CONNECTED"; - spin_unlock_irqrestore(&cdev->lock, flags); -out: - return sprintf(buf, "%s\n", state); -} - -#define DESCRIPTOR_ATTR(field, format_string) \ -static ssize_t \ -field ## _show(struct device *dev, struct device_attribute *attr, \ - char *buf) \ -{ \ - return sprintf(buf, format_string, device_desc.field); \ -} \ -static ssize_t \ -field ## _store(struct device *dev, struct device_attribute *attr, \ - const char *buf, size_t size) \ -{ \ - int value; \ - if (sscanf(buf, format_string, &value) == 1) { \ - device_desc.field = value; \ - return size; \ - } \ - return -1; \ -} \ -static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, field ## _show, field ## _store); - -DESCRIPTOR_ATTR(bDeviceClass, "%d\n") -DESCRIPTOR_ATTR(bDeviceSubClass, "%d\n") -DESCRIPTOR_ATTR(bDeviceProtocol, "%d\n") - -static DEVICE_ATTR(functions, S_IRUGO | S_IWUSR, functions_show, - functions_store); -static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store); -static DEVICE_ATTR(state, S_IRUGO, state_show, NULL); - -static struct device_attribute *ccg_usb_attributes[] = { - &dev_attr_bDeviceClass, - &dev_attr_bDeviceSubClass, - &dev_attr_bDeviceProtocol, - &dev_attr_functions, - &dev_attr_enable, - &dev_attr_state, - NULL -}; - -/*-------------------------------------------------------------------------*/ -/* Composite driver */ - -static int ccg_bind_config(struct usb_configuration *c) -{ - struct ccg_dev *dev = _ccg_dev; - return ccg_bind_enabled_functions(dev, c); -} - -static void ccg_unbind_config(struct usb_configuration *c) -{ - struct ccg_dev *dev = _ccg_dev; - - ccg_unbind_enabled_functions(dev, c); - - usb_ep_autoconfig_reset(dev->cdev->gadget); -} - -static int ccg_bind(struct usb_composite_dev *cdev) -{ - struct ccg_dev *dev = _ccg_dev; - struct usb_gadget *gadget = cdev->gadget; - int gcnum, ret; - - /* - * Start disconnected. Userspace will connect the gadget once - * it is done configuring the functions. - */ - usb_gadget_disconnect(gadget); - - ret = ccg_init_functions(dev->functions, cdev); - if (ret) - return ret; - - gcnum = usb_gadget_controller_number(gadget); - if (gcnum >= 0) - device_desc.bcdDevice = cpu_to_le16(0x0200 + gcnum); - else { - pr_warn("%s: controller '%s' not recognized\n", - longname, gadget->name); - device_desc.bcdDevice = __constant_cpu_to_le16(0x9999); - } - - usb_gadget_set_selfpowered(gadget); - dev->cdev = cdev; - - return 0; -} - -static int ccg_usb_unbind(struct usb_composite_dev *cdev) -{ - struct ccg_dev *dev = _ccg_dev; - - cancel_work_sync(&dev->work); - ccg_cleanup_functions(dev->functions); - return 0; -} - -static struct usb_composite_driver ccg_usb_driver = { - .name = "configurable_usb", - .dev = &device_desc, - .bind = ccg_bind, - .unbind = ccg_usb_unbind, - .needs_serial = true, - .iManufacturer = "Linux Foundation", - .iProduct = longname, - .iSerialNumber = "1234567890123456", -}; - -static int ccg_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *c) -{ - struct ccg_dev *dev = _ccg_dev; - struct usb_composite_dev *cdev = get_gadget_data(gadget); - struct usb_request *req = cdev->req; - struct ccg_usb_function *f; - int value = -EOPNOTSUPP; - unsigned long flags; - - req->zero = 0; - req->complete = composite_setup_complete; - req->length = 0; - gadget->ep0->driver_data = cdev; - - list_for_each_entry(f, &dev->enabled_functions, enabled_list) { - if (f->ctrlrequest) { - value = f->ctrlrequest(f, cdev, c); - if (value >= 0) - break; - } - } - - if (value < 0) - value = composite_setup(gadget, c); - - spin_lock_irqsave(&cdev->lock, flags); - if (!dev->connected) { - dev->connected = 1; - schedule_work(&dev->work); - } else if (c->bRequest == USB_REQ_SET_CONFIGURATION && - cdev->config) { - schedule_work(&dev->work); - } - spin_unlock_irqrestore(&cdev->lock, flags); - - return value; -} - -static void ccg_disconnect(struct usb_gadget *gadget) -{ - struct ccg_dev *dev = _ccg_dev; - struct usb_composite_dev *cdev = get_gadget_data(gadget); - unsigned long flags; - - composite_disconnect(gadget); - - spin_lock_irqsave(&cdev->lock, flags); - dev->connected = 0; - schedule_work(&dev->work); - spin_unlock_irqrestore(&cdev->lock, flags); -} - -static int ccg_create_device(struct ccg_dev *dev) -{ - struct device_attribute **attrs = ccg_usb_attributes; - struct device_attribute *attr; - int err; - - dev->dev = device_create(ccg_class, NULL, MKDEV(0, 0), NULL, "ccg0"); - if (IS_ERR(dev->dev)) - return PTR_ERR(dev->dev); - - dev_set_drvdata(dev->dev, dev); - - while ((attr = *attrs++)) { - err = device_create_file(dev->dev, attr); - if (err) { - device_destroy(ccg_class, dev->dev->devt); - return err; - } - } - return 0; -} - - -static int __init ccg_init(void) -{ - struct ccg_dev *dev; - int err; - - ccg_class = class_create(THIS_MODULE, "ccg_usb"); - if (IS_ERR(ccg_class)) - return PTR_ERR(ccg_class); - - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (!dev) { - class_destroy(ccg_class); - return -ENOMEM; - } - - dev->functions = supported_functions; - INIT_LIST_HEAD(&dev->enabled_functions); - INIT_WORK(&dev->work, ccg_work); - mutex_init(&dev->mutex); - - err = ccg_create_device(dev); - if (err) { - class_destroy(ccg_class); - kfree(dev); - return err; - } - - _ccg_dev = dev; - - /* Override composite driver functions */ - composite_driver.setup = ccg_setup; - composite_driver.disconnect = ccg_disconnect; - - err = usb_composite_probe(&ccg_usb_driver); - if (err) { - class_destroy(ccg_class); - kfree(dev); - } - - return err; -} -module_init(ccg_init); - -static void __exit ccg_exit(void) -{ - usb_composite_unregister(&ccg_usb_driver); - class_destroy(ccg_class); - kfree(_ccg_dev); - _ccg_dev = NULL; -} -module_exit(ccg_exit); |