/*-------------------------------------------------------------------------*/
/* 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;
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;
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)
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
.bAlternateSetting = 0,
- .bNumEndpoints = 1,
+ .bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_HID,
/* .bInterfaceSubClass = DYNAMIC */
/* .bInterfaceProtocol = DYNAMIC */
*/
};
+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,
};
*/
};
+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,
};
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;
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)
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;
}
/*-------------------------------------------------------------------------*/
/* usb_function */
-static void hidg_set_report_complete(struct usb_ep *ep, struct usb_request *req)
+static struct usb_request *hidg_alloc_ep_req(struct usb_ep *ep, unsigned length)
{
- struct f_hidg *hidg = (struct f_hidg *)req->context;
-
- if (req->status != 0 || req->buf == NULL || req->actual == 0) {
- ERROR(hidg->func.config->cdev, "%s FAILED\n", __func__);
- return;
+ 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;
+}
- spin_lock(&hidg->spinlock);
-
- hidg->set_report_buff = krealloc(hidg->set_report_buff,
- req->actual, GFP_ATOMIC);
+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_req_list *req_list;
+ unsigned long flags;
- if (hidg->set_report_buff == NULL) {
- spin_unlock(&hidg->spinlock);
+ req_list = kzalloc(sizeof(*req_list), GFP_ATOMIC);
+ if (!req_list)
return;
- }
- hidg->set_report_length = req->actual;
- memcpy(hidg->set_report_buff, req->buf, req->actual);
- spin_unlock(&hidg->spinlock);
+ req_list->req = req;
+
+ 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);
}
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
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);
}
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;
}
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;
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)
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;
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);
usb_free_descriptors(f->descriptors);
kfree(hidg->report_desc);
- kfree(hidg->set_report_buff);
kfree(hidg);
}
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);
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff