diff options
Diffstat (limited to 'drivers/usb/gadget/composite.c')
-rw-r--r-- | drivers/usb/gadget/composite.c | 220 |
1 files changed, 214 insertions, 6 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index c2251c40a20..920de9baaee 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -25,7 +25,8 @@ #include <linux/slab.h> #include <linux/device.h> #include <linux/utsname.h> - +#include <linux/delay.h> +#include <linux/kdev_t.h> #include <linux/usb/composite.h> @@ -75,6 +76,56 @@ static char composite_manufacturer[50]; /*-------------------------------------------------------------------------*/ +static ssize_t enable_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct usb_function *f = dev_get_drvdata(dev); + return sprintf(buf, "%d\n", !f->disabled); +} + +static ssize_t enable_store( + struct device *dev, struct device_attribute *attr, + const char *buf, size_t size) +{ + struct usb_function *f = dev_get_drvdata(dev); + struct usb_composite_driver *driver = f->config->cdev->driver; + int value; + + sscanf(buf, "%d", &value); + if (driver->enable_function) + driver->enable_function(f, value); + else + usb_function_set_enabled(f, value); + + return size; +} + +static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store); + +void usb_function_set_enabled(struct usb_function *f, int enabled) +{ + f->disabled = !enabled; + kobject_uevent(&f->dev->kobj, KOBJ_CHANGE); +} + + +void usb_composite_force_reset(struct usb_composite_dev *cdev) +{ + unsigned long flags; + + spin_lock_irqsave(&cdev->lock, flags); + /* force reenumeration */ + if (cdev && cdev->gadget && cdev->gadget->speed != USB_SPEED_UNKNOWN) { + spin_unlock_irqrestore(&cdev->lock, flags); + + usb_gadget_disconnect(cdev->gadget); + msleep(10); + usb_gadget_connect(cdev->gadget); + } else { + spin_unlock_irqrestore(&cdev->lock, flags); + } +} + /** * usb_add_function() - add a function to a configuration * @config: the configuration @@ -92,15 +143,30 @@ static char composite_manufacturer[50]; int usb_add_function(struct usb_configuration *config, struct usb_function *function) { + struct usb_composite_dev *cdev = config->cdev; int value = -EINVAL; + int index; - DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n", + DBG(cdev, "adding '%s'/%p to config '%s'/%p\n", function->name, function, config->label, config); if (!function->set_alt || !function->disable) goto done; + index = atomic_inc_return(&cdev->driver->function_count); + function->dev = device_create(cdev->driver->class, NULL, + MKDEV(0, index), NULL, function->name); + if (IS_ERR(function->dev)) + return PTR_ERR(function->dev); + + value = device_create_file(function->dev, &dev_attr_enable); + if (value < 0) { + device_destroy(cdev->driver->class, MKDEV(0, index)); + return value; + } + dev_set_drvdata(function->dev, function); + function->config = config; list_add_tail(&function->list, &config->functions); @@ -126,7 +192,7 @@ int usb_add_function(struct usb_configuration *config, done: if (value) - DBG(config->cdev, "adding '%s'/%p --> %d\n", + DBG(cdev, "adding '%s'/%p --> %d\n", function->name, function, value); return value; } @@ -236,17 +302,20 @@ static int config_buf(struct usb_configuration *config, enum usb_device_speed speed, void *buf, u8 type) { struct usb_config_descriptor *c = buf; + struct usb_interface_descriptor *intf; + struct usb_interface_assoc_descriptor *iad = NULL; void *next = buf + USB_DT_CONFIG_SIZE; int len = USB_BUFSIZ - USB_DT_CONFIG_SIZE; struct usb_function *f; int status; + int interfaceCount = 0; + u8 *dest; /* write the config descriptor */ c = buf; c->bLength = USB_DT_CONFIG_SIZE; c->bDescriptorType = type; - /* wTotalLength is written later */ - c->bNumInterfaces = config->next_interface_id; + /* wTotalLength and bNumInterfaces are written later */ c->bConfigurationValue = config->bConfigurationValue; c->iConfiguration = config->iConfiguration; c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; @@ -265,23 +334,54 @@ static int config_buf(struct usb_configuration *config, /* add each function's descriptors */ list_for_each_entry(f, &config->functions, list) { struct usb_descriptor_header **descriptors; + struct usb_descriptor_header *descriptor; if (speed == USB_SPEED_HIGH) descriptors = f->hs_descriptors; else descriptors = f->descriptors; - if (!descriptors) + if (f->disabled || !descriptors || descriptors[0] == NULL) continue; status = usb_descriptor_fillbuf(next, len, (const struct usb_descriptor_header **) descriptors); if (status < 0) return status; + + /* set interface numbers dynamically */ + dest = next; + while ((descriptor = *descriptors++) != NULL) { + intf = (struct usb_interface_descriptor *)dest; + if (intf->bDescriptorType == USB_DT_INTERFACE) { + /* don't increment bInterfaceNumber for alternate settings */ + if (intf->bAlternateSetting == 0) + intf->bInterfaceNumber = interfaceCount++; + else + intf->bInterfaceNumber = interfaceCount - 1; + if (iad) { + iad->bFirstInterface = + intf->bInterfaceNumber; + iad = NULL; + } + } else if (intf->bDescriptorType == + USB_DT_INTERFACE_ASSOCIATION) { + /* This will be first if it exists. Save + * a pointer to it so we can properly set + * bFirstInterface when we process the first + * interface. + */ + iad = (struct usb_interface_assoc_descriptor *) + dest; + } + dest += intf->bLength; + } + len -= status; next += status; } len = next - buf; c->wTotalLength = cpu_to_le16(len); + c->bNumInterfaces = interfaceCount; return len; } @@ -428,6 +528,8 @@ static int set_config(struct usb_composite_dev *cdev, if (!f) break; + if (f->disabled) + continue; /* * Record which endpoints are used by the function. This is used @@ -467,6 +569,8 @@ static int set_config(struct usb_composite_dev *cdev, power = c->bMaxPower ? (2 * c->bMaxPower) : CONFIG_USB_GADGET_VBUS_DRAW; done: usb_gadget_vbus_draw(gadget, power); + + schedule_work(&cdev->switch_work); return result; } @@ -806,6 +910,14 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) u16 w_length = le16_to_cpu(ctrl->wLength); struct usb_function *f = NULL; u8 endp; + unsigned long flags; + + spin_lock_irqsave(&cdev->lock, flags); + if (!cdev->connected) { + cdev->connected = 1; + schedule_work(&cdev->switch_work); + } + spin_unlock_irqrestore(&cdev->lock, flags); /* partial re-init of the response message; the function or the * gadget might need to intercept e.g. a control-OUT completion @@ -849,6 +961,21 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) case USB_DT_STRING: value = get_string(cdev, req->buf, w_index, w_value & 0xff); + + /* Allow functions to handle USB_DT_STRING. + * This is required for MTP. + */ + if (value < 0) { + struct usb_configuration *cfg; + list_for_each_entry(cfg, &cdev->configs, list) { + if (cfg && cfg->setup) { + value = cfg->setup(cfg, ctrl); + if (value >= 0) + break; + } + } + } + if (value >= 0) value = min(w_length, (u16) value); break; @@ -954,6 +1081,25 @@ unknown: value = c->setup(c, ctrl); } + /* If the vendor request is not processed (value < 0), + * call all device registered configure setup callbacks + * to process it. + * This is used to handle the following cases: + * - vendor request is for the device and arrives before + * setconfiguration. + * - Some devices are required to handle vendor request before + * setconfiguration such as MTP, USBNET. + */ + + if (value < 0) { + struct usb_configuration *cfg; + + list_for_each_entry(cfg, &cdev->configs, list) { + if (cfg && cfg->setup) + value = cfg->setup(cfg, ctrl); + } + } + goto done; } @@ -985,8 +1131,12 @@ static void composite_disconnect(struct usb_gadget *gadget) spin_lock_irqsave(&cdev->lock, flags); if (cdev->config) reset_config(cdev); + if (composite->disconnect) composite->disconnect(cdev); + + cdev->connected = 0; + schedule_work(&cdev->switch_work); spin_unlock_irqrestore(&cdev->lock, flags); } @@ -1048,6 +1198,8 @@ composite_unbind(struct usb_gadget *gadget) kfree(cdev->req->buf); usb_ep_free_request(gadget->ep0, cdev->req); } + switch_dev_unregister(&cdev->sw_connected); + switch_dev_unregister(&cdev->sw_config); device_remove_file(&gadget->dev, &dev_attr_suspended); kfree(cdev); set_gadget_data(gadget, NULL); @@ -1067,6 +1219,30 @@ static u8 override_id(struct usb_composite_dev *cdev, u8 *desc) return *desc; } +static void +composite_switch_work(struct work_struct *data) +{ + struct usb_composite_dev *cdev = + container_of(data, struct usb_composite_dev, switch_work); + struct usb_configuration *config = cdev->config; + int connected; + unsigned long flags; + + spin_lock_irqsave(&cdev->lock, flags); + if (cdev->connected != cdev->sw_connected.state) { + connected = cdev->connected; + spin_unlock_irqrestore(&cdev->lock, flags); + switch_set_state(&cdev->sw_connected, connected); + } else { + spin_unlock_irqrestore(&cdev->lock, flags); + } + + if (config) + switch_set_state(&cdev->sw_config, config->bConfigurationValue); + else + switch_set_state(&cdev->sw_config, 0); +} + static int composite_bind(struct usb_gadget *gadget) { struct usb_composite_dev *cdev; @@ -1116,6 +1292,16 @@ static int composite_bind(struct usb_gadget *gadget) if (status < 0) goto fail; + cdev->sw_connected.name = "usb_connected"; + status = switch_dev_register(&cdev->sw_connected); + if (status < 0) + goto fail; + cdev->sw_config.name = "usb_configuration"; + status = switch_dev_register(&cdev->sw_config); + if (status < 0) + goto fail; + INIT_WORK(&cdev->switch_work, composite_switch_work); + cdev->desc = *composite->dev; cdev->desc.bMaxPacketSize0 = gadget->ep0->maxpacket; @@ -1221,6 +1407,23 @@ composite_resume(struct usb_gadget *gadget) cdev->suspended = 0; } +static int +composite_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct usb_function *f = dev_get_drvdata(dev); + + if (!f) { + /* this happens when the device is first created */ + return 0; + } + + if (add_uevent_var(env, "FUNCTION=%s", f->name)) + return -ENOMEM; + if (add_uevent_var(env, "ENABLED=%d", !f->disabled)) + return -ENOMEM; + return 0; +} + /*-------------------------------------------------------------------------*/ static struct usb_gadget_driver composite_driver = { @@ -1273,6 +1476,11 @@ int usb_composite_probe(struct usb_composite_driver *driver, composite = driver; composite_gadget_bind = bind; + driver->class = class_create(THIS_MODULE, "usb_composite"); + if (IS_ERR(driver->class)) + return PTR_ERR(driver->class); + driver->class->dev_uevent = composite_uevent; + return usb_gadget_probe_driver(&composite_driver, composite_bind); } |