diff --git a/drivers/usb/gadget/f_hid.c b/drivers/usb/gadget/f_hid.c index 3b3932c55361..16a8b1c15c62 100644 --- a/drivers/usb/gadget/f_hid.c +++ b/drivers/usb/gadget/f_hid.c @@ -26,6 +26,12 @@ static struct class *hidg_class; /*-------------------------------------------------------------------------*/ /* HID gadget struct */ +struct f_hidg_req_list { + struct usb_request *req; + unsigned int pos; + struct list_head list; +}; + struct f_hidg { /* configuration */ unsigned char bInterfaceSubClass; @@ -35,10 +41,10 @@ struct f_hidg { unsigned short report_length; /* recv report */ - char *set_report_buff; - unsigned short set_report_length; + struct list_head completed_out_req; spinlock_t spinlock; wait_queue_head_t read_queue; + unsigned int qlen; /* send report */ struct mutex lock; @@ -49,7 +55,9 @@ struct f_hidg { int minor; struct cdev cdev; struct usb_function func; + struct usb_ep *in_ep; + struct usb_ep *out_ep; }; static inline struct f_hidg *func_to_hidg(struct usb_function *f) @@ -65,7 +73,7 @@ static struct usb_interface_descriptor hidg_interface_desc = { .bDescriptorType = USB_DT_INTERFACE, /* .bInterfaceNumber = DYNAMIC */ .bAlternateSetting = 0, - .bNumEndpoints = 1, + .bNumEndpoints = 2, .bInterfaceClass = USB_CLASS_HID, /* .bInterfaceSubClass = DYNAMIC */ /* .bInterfaceProtocol = DYNAMIC */ @@ -96,10 +104,23 @@ static struct usb_endpoint_descriptor hidg_hs_in_ep_desc = { */ }; +static struct usb_endpoint_descriptor hidg_hs_out_ep_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_INT, + /*.wMaxPacketSize = DYNAMIC */ + .bInterval = 4, /* FIXME: Add this field in the + * HID gadget configuration? + * (struct hidg_func_descriptor) + */ +}; + static struct usb_descriptor_header *hidg_hs_descriptors[] = { (struct usb_descriptor_header *)&hidg_interface_desc, (struct usb_descriptor_header *)&hidg_desc, (struct usb_descriptor_header *)&hidg_hs_in_ep_desc, + (struct usb_descriptor_header *)&hidg_hs_out_ep_desc, NULL, }; @@ -117,10 +138,23 @@ static struct usb_endpoint_descriptor hidg_fs_in_ep_desc = { */ }; +static struct usb_endpoint_descriptor hidg_fs_out_ep_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_INT, + /*.wMaxPacketSize = DYNAMIC */ + .bInterval = 10, /* FIXME: Add this field in the + * HID gadget configuration? + * (struct hidg_func_descriptor) + */ +}; + static struct usb_descriptor_header *hidg_fs_descriptors[] = { (struct usb_descriptor_header *)&hidg_interface_desc, (struct usb_descriptor_header *)&hidg_desc, (struct usb_descriptor_header *)&hidg_fs_in_ep_desc, + (struct usb_descriptor_header *)&hidg_fs_out_ep_desc, NULL, }; @@ -130,9 +164,11 @@ static struct usb_descriptor_header *hidg_fs_descriptors[] = { static ssize_t f_hidg_read(struct file *file, char __user *buffer, size_t count, loff_t *ptr) { - struct f_hidg *hidg = file->private_data; - char *tmp_buff = NULL; - unsigned long flags; + struct f_hidg *hidg = file->private_data; + struct f_hidg_req_list *list; + struct usb_request *req; + unsigned long flags; + int ret; if (!count) return 0; @@ -142,8 +178,9 @@ static ssize_t f_hidg_read(struct file *file, char __user *buffer, spin_lock_irqsave(&hidg->spinlock, flags); -#define READ_COND (hidg->set_report_buff != NULL) +#define READ_COND (!list_empty(&hidg->completed_out_req)) + /* wait for at least one buffer to complete */ while (!READ_COND) { spin_unlock_irqrestore(&hidg->spinlock, flags); if (file->f_flags & O_NONBLOCK) @@ -155,19 +192,34 @@ static ssize_t f_hidg_read(struct file *file, char __user *buffer, spin_lock_irqsave(&hidg->spinlock, flags); } - - count = min_t(unsigned, count, hidg->set_report_length); - tmp_buff = hidg->set_report_buff; - hidg->set_report_buff = NULL; - + /* pick the first one */ + list = list_first_entry(&hidg->completed_out_req, + struct f_hidg_req_list, list); + req = list->req; + count = min_t(unsigned int, count, req->actual - list->pos); spin_unlock_irqrestore(&hidg->spinlock, flags); - if (tmp_buff != NULL) { - /* copy to user outside spinlock */ - count -= copy_to_user(buffer, tmp_buff, count); - kfree(tmp_buff); - } else - count = -ENOMEM; + /* copy to user outside spinlock */ + count -= copy_to_user(buffer, req->buf + list->pos, count); + list->pos += count; + + /* + * if this request is completely handled and transfered to + * userspace, remove its entry from the list and requeue it + * again. Otherwise, we will revisit it again upon the next + * call, taking into account its current read position. + */ + if (list->pos == req->actual) { + spin_lock_irqsave(&hidg->spinlock, flags); + list_del(&list->list); + kfree(list); + spin_unlock_irqrestore(&hidg->spinlock, flags); + + req->length = hidg->report_length; + ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL); + if (ret < 0) + return ret; + } return count; } @@ -282,28 +334,37 @@ static int f_hidg_open(struct inode *inode, struct file *fd) /*-------------------------------------------------------------------------*/ /* usb_function */ +static struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep, unsigned length) +{ + struct usb_request *req; + + req = usb_ep_alloc_request(ep, GFP_ATOMIC); + if (req) { + req->length = length; + req->buf = kmalloc(length, GFP_ATOMIC); + if (!req->buf) { + usb_ep_free_request(ep, req); + req = NULL; + } + } + return req; +} + static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req) { - struct f_hidg *hidg = (struct f_hidg *)req->context; + struct f_hidg *hidg = (struct f_hidg *) req->context; + struct f_hidg_req_list *req_list; + unsigned long flags; - if (req->status != 0 || req->buf == NULL || req->actual == 0) { - ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__); + req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC); + if (!req_list) return; - } - spin_lock(&hidg->spinlock); + req_list->req = req; - hidg->set_report_buff = krealloc(hidg->set_report_buff, - req->actual, GFP_ATOMIC); - - if (hidg->set_report_buff == NULL) { - spin_unlock(&hidg->spinlock); - return; - } - hidg->set_report_length = req->actual; - memcpy(hidg->set_report_buff, req->buf, req->actual); - - spin_unlock(&hidg->spinlock); + spin_lock_irqsave(&hidg->spinlock, flags); + list_add_tail(&req_list->list, &hidg->completed_out_req); + spin_unlock_irqrestore(&hidg->spinlock, flags); wake_up(&hidg->read_queue); } @@ -344,9 +405,7 @@ static int hidg_setup(struct usb_function *f, case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 | HID_REQ_SET_REPORT): VDBG(cdev, "set_report | wLenght=%d\n", ctrl->wLength); - req->context = hidg; - req->complete = hidg_set_report_complete; - goto respond; + goto stall; break; case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8 @@ -403,16 +462,25 @@ respond: static void hidg_disable(struct usb_function *f) { struct f_hidg *hidg = func_to_hidg(f); + struct f_hidg_req_list *list, *next; usb_ep_disable(hidg->in_ep); hidg->in_ep->driver_data = NULL; + + usb_ep_disable(hidg->out_ep); + hidg->out_ep->driver_data = NULL; + + list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) { + list_del(&list->list); + kfree(list); + } } static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) { struct usb_composite_dev *cdev = f->config->cdev; struct f_hidg *hidg = func_to_hidg(f); - int status = 0; + int i, status = 0; VDBG(cdev, "hidg_set_alt intf:%d alt:%d\n", intf, alt); @@ -429,11 +497,55 @@ static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt) } status = usb_ep_enable(hidg->in_ep); if (status < 0) { - ERROR(cdev, "Enable endpoint FAILED!\n"); + ERROR(cdev, "Enable IN endpoint FAILED!\n"); goto fail; } hidg->in_ep->driver_data = hidg; } + + + if (hidg->out_ep != NULL) { + /* restart endpoint */ + if (hidg->out_ep->driver_data != NULL) + usb_ep_disable(hidg->out_ep); + + status = config_ep_by_speed(f->config->cdev->gadget, f, + hidg->out_ep); + if (status) { + ERROR(cdev, "config_ep_by_speed FAILED!\n"); + goto fail; + } + status = usb_ep_enable(hidg->out_ep); + if (status < 0) { + ERROR(cdev, "Enable IN endpoint FAILED!\n"); + goto fail; + } + hidg->out_ep->driver_data = hidg; + + /* + * allocate a bunch of read buffers and queue them all at once. + */ + for (i = 0; i < hidg->qlen && status == 0; i++) { + struct usb_request *req = + hidg_alloc_ep_req(hidg->out_ep, + hidg->report_length); + if (req) { + req->complete = hidg_set_report_complete; + req->context = hidg; + status = usb_ep_queue(hidg->out_ep, req, + GFP_ATOMIC); + if (status) + ERROR(cdev, "%s queue req --> %d\n", + hidg->out_ep->name, status); + } else { + usb_ep_disable(hidg->out_ep); + hidg->out_ep->driver_data = NULL; + status = -ENOMEM; + goto fail; + } + } + } + fail: return status; } @@ -470,13 +582,18 @@ static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) ep->driver_data = c->cdev; /* claim */ hidg->in_ep = ep; + ep = usb_ep_autoconfig(c->cdev->gadget, &hidg_fs_out_ep_desc); + if (!ep) + goto fail; + ep->driver_data = c->cdev; /* claim */ + hidg->out_ep = ep; + /* preallocate request and buffer */ status = -ENOMEM; hidg->req = usb_ep_alloc_request(hidg->in_ep, GFP_KERNEL); if (!hidg->req) goto fail; - hidg->req->buf = kmalloc(hidg->report_length, GFP_KERNEL); if (!hidg->req->buf) goto fail; @@ -486,12 +603,12 @@ static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) hidg_interface_desc.bInterfaceProtocol = hidg->bInterfaceProtocol; hidg_hs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); hidg_fs_in_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); + hidg_hs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); + hidg_fs_out_ep_desc.wMaxPacketSize = cpu_to_le16(hidg->report_length); hidg_desc.desc[0].bDescriptorType = HID_DT_REPORT; hidg_desc.desc[0].wDescriptorLength = cpu_to_le16(hidg->report_desc_length); - hidg->set_report_buff = NULL; - /* copy descriptors */ f->descriptors = usb_copy_descriptors(hidg_fs_descriptors); if (!f->descriptors) @@ -500,6 +617,8 @@ static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) if (gadget_is_dualspeed(c->cdev->gadget)) { hidg_hs_in_ep_desc.bEndpointAddress = hidg_fs_in_ep_desc.bEndpointAddress; + hidg_hs_out_ep_desc.bEndpointAddress = + hidg_fs_out_ep_desc.bEndpointAddress; f->hs_descriptors = usb_copy_descriptors(hidg_hs_descriptors); if (!f->hs_descriptors) goto fail; @@ -509,6 +628,7 @@ static int __init hidg_bind(struct usb_configuration *c, struct usb_function *f) spin_lock_init(&hidg->spinlock); init_waitqueue_head(&hidg->write_queue); init_waitqueue_head(&hidg->read_queue); + INIT_LIST_HEAD(&hidg->completed_out_req); /* create char device */ cdev_init(&hidg->cdev, &f_hidg_fops); @@ -553,7 +673,6 @@ static void hidg_unbind(struct usb_configuration *c, struct usb_function *f) usb_free_descriptors(f->descriptors); kfree(hidg->report_desc); - kfree(hidg->set_report_buff); kfree(hidg); } @@ -624,6 +743,9 @@ int __init hidg_bind_config(struct usb_configuration *c, hidg->func.disable = hidg_disable; hidg->func.setup = hidg_setup; + /* this could me made configurable at some point */ + hidg->qlen = 4; + status = usb_add_function(c, &hidg->func); if (status) kfree(hidg);