diff options
Diffstat (limited to 'drivers/staging/ccg/ccg.c')
| -rw-r--r-- | drivers/staging/ccg/ccg.c | 1299 |
1 files changed, 1299 insertions, 0 deletions
diff --git a/drivers/staging/ccg/ccg.c b/drivers/staging/ccg/ccg.c new file mode 100644 index 000000000000..a5b36a97598d --- /dev/null +++ b/drivers/staging/ccg/ccg.c @@ -0,0 +1,1299 @@ +/* + * 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 <linux/usb/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 "../../usb/gadget/usbstring.c" +#include "../../usb/gadget/config.c" +#include "../../usb/gadget/epautoconf.c" +#include "../../usb/gadget/composite.c" + +#include "../../usb/gadget/f_mass_storage.c" +#include "../../usb/gadget/u_serial.c" +#include "../../usb/gadget/f_acm.c" +#define USB_ETH_RNDIS y +#include "../../usb/gadget/f_rndis.c" +#include "../../usb/gadget/rndis.c" +#include "../../usb/gadget/u_ether.c" +#include "../../usb/gadget/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: %02X:%02X:%02X:%02X:%02X:%02X\n", __func__, + rndis->ethaddr[0], rndis->ethaddr[1], rndis->ethaddr[2], + rndis->ethaddr[3], rndis->ethaddr[4], rndis->ethaddr[5]); + + 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, "%02x:%02x:%02x:%02x:%02x:%02x\n", + rndis->ethaddr[0], rndis->ethaddr[1], rndis->ethaddr[2], + rndis->ethaddr[3], rndis->ethaddr[4], rndis->ethaddr[5]); +} + +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; + int ret = 0; + + ret = ccg_bind_enabled_functions(dev, c); + if (ret) + return ret; + + return 0; +} + +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_warning("%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, + .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 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) + 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, ccg_bind); + if (err) { + class_destroy(ccg_class); + kfree(dev); + } + + return err; +} +module_init(init); + +static void __exit cleanup(void) +{ + usb_composite_unregister(&ccg_usb_driver); + class_destroy(ccg_class); + kfree(_ccg_dev); + _ccg_dev = NULL; +} +module_exit(cleanup); |