- int chars = 0;
- unsigned long flags;
- struct gs_port *port = tty->driver_data;
-
- if (port == NULL)
- return 0;
-
- spin_lock_irqsave(&port->port_lock, flags);
-
- if (port->port_dev != NULL && port->port_open_count > 0
- && port->port_write_buf != NULL)
- chars = gs_buf_data_avail(port->port_write_buf);
-
- spin_unlock_irqrestore(&port->port_lock, flags);
-
- gs_debug("gs_chars_in_buffer: (%d,%p) chars=%d\n",
- port->port_num, tty, chars);
-
- return chars;
-}
-
-/*
- * gs_throttle
- */
-static void gs_throttle(struct tty_struct *tty)
-{
-}
-
-/*
- * gs_unthrottle
- */
-static void gs_unthrottle(struct tty_struct *tty)
-{
-}
-
-/*
- * gs_break
- */
-static void gs_break(struct tty_struct *tty, int break_state)
-{
-}
-
-/*
- * gs_ioctl
- */
-static int gs_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
-{
- struct gs_port *port = tty->driver_data;
-
- if (port == NULL) {
- pr_err("gs_ioctl: NULL port pointer\n");
- return -EIO;
- }
-
- gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
- port->port_num, tty, file, cmd, arg);
-
- /* handle ioctls */
-
- /* could not handle ioctl */
- return -ENOIOCTLCMD;
-}
-
-/*
- * gs_set_termios
- */
-static void gs_set_termios(struct tty_struct *tty, struct ktermios *old)
-{
-}
-
-/*
-* gs_send
-*
-* This function finds available write requests, calls
-* gs_send_packet to fill these packets with data, and
-* continues until either there are no more write requests
-* available or no more data to send. This function is
-* run whenever data arrives or write requests are available.
-*/
-static int gs_send(struct gs_dev *dev)
-{
- int ret,len;
- unsigned long flags;
- struct usb_ep *ep;
- struct usb_request *req;
- struct gs_req_entry *req_entry;
-
- if (dev == NULL) {
- pr_err("gs_send: NULL device pointer\n");
- return -ENODEV;
- }
-
- spin_lock_irqsave(&dev->dev_lock, flags);
-
- ep = dev->dev_in_ep;
-
- while(!list_empty(&dev->dev_req_list)) {
-
- req_entry = list_entry(dev->dev_req_list.next,
- struct gs_req_entry, re_entry);
-
- req = req_entry->re_req;
-
- len = gs_send_packet(dev, req->buf, ep->maxpacket);
-
- if (len > 0) {
- gs_debug_level(3, "gs_send: len=%d, 0x%2.2x "
- "0x%2.2x 0x%2.2x ...\n", len,
- *((unsigned char *)req->buf),
- *((unsigned char *)req->buf+1),
- *((unsigned char *)req->buf+2));
- list_del(&req_entry->re_entry);
- req->length = len;
- spin_unlock_irqrestore(&dev->dev_lock, flags);
- if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
- pr_err(
- "gs_send: cannot queue read request, ret=%d\n",
- ret);
- spin_lock_irqsave(&dev->dev_lock, flags);
- break;
- }
- spin_lock_irqsave(&dev->dev_lock, flags);
- } else {
- break;
- }
-
- }
-
- spin_unlock_irqrestore(&dev->dev_lock, flags);
-
- return 0;
-}
-
-/*
- * gs_send_packet
- *
- * If there is data to send, a packet is built in the given
- * buffer and the size is returned. If there is no data to
- * send, 0 is returned. If there is any error a negative
- * error number is returned.
- *
- * Called during USB completion routine, on interrupt time.
- *
- * We assume that disconnect will not happen until all completion
- * routines have completed, so we can assume that the dev_port
- * array does not change during the lifetime of this function.
- */
-static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
-{
- unsigned int len;
- struct gs_port *port;
-
- /* TEMPORARY -- only port 0 is supported right now */
- port = dev->dev_port[0];
-
- if (port == NULL) {
- pr_err("gs_send_packet: port=%d, NULL port pointer\n", 0);
- return -EIO;
- }
-
- spin_lock(&port->port_lock);
-
- len = gs_buf_data_avail(port->port_write_buf);
- if (len < size)
- size = len;
-
- if (size == 0)
- goto exit;
-
- size = gs_buf_get(port->port_write_buf, packet, size);
-
- if (port->port_tty)
- wake_up_interruptible(&port->port_tty->write_wait);
-
-exit:
- spin_unlock(&port->port_lock);
- return size;
-}
-
-/*
- * gs_recv_packet
- *
- * Called for each USB packet received. Reads the packet
- * header and stuffs the data in the appropriate tty buffer.
- * Returns 0 if successful, or a negative error number.
- *
- * Called during USB completion routine, on interrupt time.
- *
- * We assume that disconnect will not happen until all completion
- * routines have completed, so we can assume that the dev_port
- * array does not change during the lifetime of this function.
- */
-static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
-{
- unsigned int len;
- struct gs_port *port;
- int ret;
- struct tty_struct *tty;
-
- /* TEMPORARY -- only port 0 is supported right now */
- port = dev->dev_port[0];
-
- if (port == NULL) {
- pr_err("gs_recv_packet: port=%d, NULL port pointer\n",
- port->port_num);
- return -EIO;
- }
-
- spin_lock(&port->port_lock);
-
- if (port->port_open_count == 0) {
- pr_err("gs_recv_packet: port=%d, port is closed\n",
- port->port_num);
- ret = -EIO;
- goto exit;
- }
-
-
- tty = port->port_tty;
-
- if (tty == NULL) {
- pr_err("gs_recv_packet: port=%d, NULL tty pointer\n",
- port->port_num);
- ret = -EIO;
- goto exit;
- }
-
- if (port->port_tty->magic != TTY_MAGIC) {
- pr_err("gs_recv_packet: port=%d, bad tty magic\n",
- port->port_num);
- ret = -EIO;
- goto exit;
- }
-
- len = tty_buffer_request_room(tty, size);
- if (len > 0) {
- tty_insert_flip_string(tty, packet, len);
- tty_flip_buffer_push(port->port_tty);
- wake_up_interruptible(&port->port_tty->read_wait);
- }
- ret = 0;
-exit:
- spin_unlock(&port->port_lock);
- return ret;
-}
-
-/*
-* gs_read_complete
-*/
-static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
-{
- int ret;
- struct gs_dev *dev = ep->driver_data;
-
- if (dev == NULL) {
- pr_err("gs_read_complete: NULL device pointer\n");
- return;
- }
-
- switch(req->status) {
- case 0:
- /* normal completion */
- gs_recv_packet(dev, req->buf, req->actual);
-requeue:
- req->length = ep->maxpacket;
- if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
- pr_err(
- "gs_read_complete: cannot queue read request, ret=%d\n",
- ret);
- }
- break;
-
- case -ESHUTDOWN:
- /* disconnect */
- gs_debug("gs_read_complete: shutdown\n");
- gs_free_req(ep, req);
- break;
-
- default:
- /* unexpected */
- pr_err(
- "gs_read_complete: unexpected status error, status=%d\n",
- req->status);
- goto requeue;
- break;
- }
-}
-
-/*
-* gs_write_complete
-*/
-static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
-{
- struct gs_dev *dev = ep->driver_data;
- struct gs_req_entry *gs_req = req->context;
-
- if (dev == NULL) {
- pr_err("gs_write_complete: NULL device pointer\n");
- return;
- }
-
- switch(req->status) {
- case 0:
- /* normal completion */
-requeue:
- if (gs_req == NULL) {
- pr_err("gs_write_complete: NULL request pointer\n");
- return;
- }
-
- spin_lock(&dev->dev_lock);
- list_add(&gs_req->re_entry, &dev->dev_req_list);
- spin_unlock(&dev->dev_lock);
-
- gs_send(dev);
-
- break;
-
- case -ESHUTDOWN:
- /* disconnect */
- gs_debug("gs_write_complete: shutdown\n");
- gs_free_req(ep, req);
- break;
-
- default:
- pr_err(
- "gs_write_complete: unexpected status error, status=%d\n",
- req->status);
- goto requeue;
- break;
- }
-}
-
-/* Gadget Driver */
-
-/*
- * gs_bind
- *
- * Called on module load. Allocates and initializes the device
- * structure and a control request.
- */
-static int __init gs_bind(struct usb_gadget *gadget)
-{
- int ret;
- struct usb_ep *ep;
- struct gs_dev *dev;
- int gcnum;
-
- /* Some controllers can't support CDC ACM:
- * - sh doesn't support multiple interfaces or configs;
- * - sa1100 doesn't have a third interrupt endpoint
- */
- if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
- use_acm = 0;
-
- gcnum = usb_gadget_controller_number(gadget);
- if (gcnum >= 0)
- gs_device_desc.bcdDevice =
- cpu_to_le16(GS_VERSION_NUM | gcnum);
- else {
- pr_warning("gs_bind: controller '%s' not recognized\n",
- gadget->name);
- /* unrecognized, but safe unless bulk is REALLY quirky */
- gs_device_desc.bcdDevice =
- __constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
- }
-
- usb_ep_autoconfig_reset(gadget);
-
- ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
- if (!ep)
- goto autoconf_fail;
- EP_IN_NAME = ep->name;
- ep->driver_data = ep; /* claim the endpoint */
-
- ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
- if (!ep)
- goto autoconf_fail;
- EP_OUT_NAME = ep->name;
- ep->driver_data = ep; /* claim the endpoint */
-
- if (use_acm) {
- ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
- if (!ep) {
- pr_err("gs_bind: cannot run ACM on %s\n", gadget->name);
- goto autoconf_fail;
- }
- gs_device_desc.idProduct = __constant_cpu_to_le16(
- GS_CDC_PRODUCT_ID),
- EP_NOTIFY_NAME = ep->name;
- ep->driver_data = ep; /* claim the endpoint */
- }
-
- gs_device_desc.bDeviceClass = use_acm
- ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
- gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
-
- if (gadget_is_dualspeed(gadget)) {
- gs_qualifier_desc.bDeviceClass = use_acm
- ? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
- /* assume ep0 uses the same packet size for both speeds */
- gs_qualifier_desc.bMaxPacketSize0 =
- gs_device_desc.bMaxPacketSize0;
- /* assume endpoints are dual-speed */
- gs_highspeed_notify_desc.bEndpointAddress =
- gs_fullspeed_notify_desc.bEndpointAddress;
- gs_highspeed_in_desc.bEndpointAddress =
- gs_fullspeed_in_desc.bEndpointAddress;
- gs_highspeed_out_desc.bEndpointAddress =
- gs_fullspeed_out_desc.bEndpointAddress;
- }
-
- usb_gadget_set_selfpowered(gadget);
-
- if (gadget_is_otg(gadget)) {
- gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
- gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
- gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
- }
-
- gs_device = dev = kzalloc(sizeof(struct gs_dev), GFP_KERNEL);
- if (dev == NULL)
- return -ENOMEM;
-
- snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
- init_utsname()->sysname, init_utsname()->release,
- gadget->name);
-
- dev->dev_gadget = gadget;
- spin_lock_init(&dev->dev_lock);
- INIT_LIST_HEAD(&dev->dev_req_list);
- set_gadget_data(gadget, dev);
-
- if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
- pr_err("gs_bind: cannot allocate ports\n");
- gs_unbind(gadget);
- return ret;
- }
-
- /* preallocate control response and buffer */
- dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
- GFP_KERNEL);
- if (dev->dev_ctrl_req == NULL) {
- gs_unbind(gadget);
- return -ENOMEM;
- }
- dev->dev_ctrl_req->complete = gs_setup_complete;
-
- gadget->ep0->driver_data = dev;
-
- pr_info("gs_bind: %s %s bound\n",
- GS_LONG_NAME, GS_VERSION_STR);
-
- return 0;
-
-autoconf_fail:
- pr_err("gs_bind: cannot autoconfigure on %s\n", gadget->name);
- return -ENODEV;
-}
-
-/*
- * gs_unbind
- *
- * Called on module unload. Frees the control request and device
- * structure.
- */
-static void /* __init_or_exit */ gs_unbind(struct usb_gadget *gadget)
-{
- struct gs_dev *dev = get_gadget_data(gadget);
-
- gs_device = NULL;
-
- /* read/write requests already freed, only control request remains */
- if (dev != NULL) {
- if (dev->dev_ctrl_req != NULL) {
- gs_free_req(gadget->ep0, dev->dev_ctrl_req);
- dev->dev_ctrl_req = NULL;
- }
- gs_free_ports(dev);
- if (dev->dev_notify_ep)
- usb_ep_disable(dev->dev_notify_ep);
- if (dev->dev_in_ep)
- usb_ep_disable(dev->dev_in_ep);
- if (dev->dev_out_ep)
- usb_ep_disable(dev->dev_out_ep);
- kfree(dev);
- set_gadget_data(gadget, NULL);
- }
-
- pr_info("gs_unbind: %s %s unbound\n", GS_LONG_NAME,
- GS_VERSION_STR);
-}
-
-/*
- * gs_setup
- *
- * Implements all the control endpoint functionality that's not
- * handled in hardware or the hardware driver.
- *
- * Returns the size of the data sent to the host, or a negative
- * error number.
- */
-static int gs_setup(struct usb_gadget *gadget,
- const struct usb_ctrlrequest *ctrl)
-{
- int ret = -EOPNOTSUPP;
- struct gs_dev *dev = get_gadget_data(gadget);
- struct usb_request *req = dev->dev_ctrl_req;
- u16 wIndex = le16_to_cpu(ctrl->wIndex);
- u16 wValue = le16_to_cpu(ctrl->wValue);
- u16 wLength = le16_to_cpu(ctrl->wLength);
-
- switch (ctrl->bRequestType & USB_TYPE_MASK) {
- case USB_TYPE_STANDARD:
- ret = gs_setup_standard(gadget,ctrl);
- break;
-
- case USB_TYPE_CLASS:
- ret = gs_setup_class(gadget,ctrl);
- break;
-
- default:
- pr_err("gs_setup: unknown request, type=%02x, request=%02x, "
- "value=%04x, index=%04x, length=%d\n",
- ctrl->bRequestType, ctrl->bRequest,
- wValue, wIndex, wLength);
- break;
- }
-
- /* respond with data transfer before status phase? */
- if (ret >= 0) {
- req->length = ret;
- req->zero = ret < wLength
- && (ret % gadget->ep0->maxpacket) == 0;
- ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
- if (ret < 0) {
- pr_err("gs_setup: cannot queue response, ret=%d\n",
- ret);
- req->status = 0;
- gs_setup_complete(gadget->ep0, req);
- }
- }
-
- /* device either stalls (ret < 0) or reports success */
- return ret;
-}
-
-static int gs_setup_standard(struct usb_gadget *gadget,
- const struct usb_ctrlrequest *ctrl)
-{
- int ret = -EOPNOTSUPP;
- struct gs_dev *dev = get_gadget_data(gadget);
- struct usb_request *req = dev->dev_ctrl_req;
- u16 wIndex = le16_to_cpu(ctrl->wIndex);
- u16 wValue = le16_to_cpu(ctrl->wValue);
- u16 wLength = le16_to_cpu(ctrl->wLength);
-
- switch (ctrl->bRequest) {
- case USB_REQ_GET_DESCRIPTOR:
- if (ctrl->bRequestType != USB_DIR_IN)
- break;
-
- switch (wValue >> 8) {
- case USB_DT_DEVICE:
- ret = min(wLength,
- (u16)sizeof(struct usb_device_descriptor));
- memcpy(req->buf, &gs_device_desc, ret);
- break;
-
- case USB_DT_DEVICE_QUALIFIER:
- if (!gadget_is_dualspeed(gadget))
- break;
- ret = min(wLength,
- (u16)sizeof(struct usb_qualifier_descriptor));
- memcpy(req->buf, &gs_qualifier_desc, ret);
- break;
-
- case USB_DT_OTHER_SPEED_CONFIG:
- if (!gadget_is_dualspeed(gadget))
- break;
- /* fall through */
- case USB_DT_CONFIG:
- ret = gs_build_config_buf(req->buf, gadget,
- wValue >> 8, wValue & 0xff,
- gadget_is_otg(gadget));
- if (ret >= 0)
- ret = min(wLength, (u16)ret);
- break;
-
- case USB_DT_STRING:
- /* wIndex == language code. */
- ret = usb_gadget_get_string(&gs_string_table,
- wValue & 0xff, req->buf);
- if (ret >= 0)
- ret = min(wLength, (u16)ret);
- break;
- }
- break;
-
- case USB_REQ_SET_CONFIGURATION:
- if (ctrl->bRequestType != 0)
- break;
- spin_lock(&dev->dev_lock);
- ret = gs_set_config(dev, wValue);
- spin_unlock(&dev->dev_lock);
- break;
-
- case USB_REQ_GET_CONFIGURATION:
- if (ctrl->bRequestType != USB_DIR_IN)
- break;
- *(u8 *)req->buf = dev->dev_config;
- ret = min(wLength, (u16)1);
- break;
-
- case USB_REQ_SET_INTERFACE:
- if (ctrl->bRequestType != USB_RECIP_INTERFACE
- || !dev->dev_config
- || wIndex >= GS_MAX_NUM_INTERFACES)
- break;
- if (dev->dev_config == GS_BULK_CONFIG_ID
- && wIndex != GS_BULK_INTERFACE_ID)
- break;
- /* no alternate interface settings */
- if (wValue != 0)
- break;
- spin_lock(&dev->dev_lock);
- /* PXA hardware partially handles SET_INTERFACE;
- * we need to kluge around that interference. */
- if (gadget_is_pxa(gadget)) {
- ret = gs_set_config(dev, use_acm ?
- GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
- goto set_interface_done;
- }
- if (dev->dev_config != GS_BULK_CONFIG_ID
- && wIndex == GS_CONTROL_INTERFACE_ID) {
- if (dev->dev_notify_ep) {
- usb_ep_disable(dev->dev_notify_ep);
- usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
- }
- } else {
- usb_ep_disable(dev->dev_in_ep);
- usb_ep_disable(dev->dev_out_ep);
- usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
- usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
- }
- ret = 0;
-set_interface_done:
- spin_unlock(&dev->dev_lock);
- break;
-
- case USB_REQ_GET_INTERFACE:
- if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
- || dev->dev_config == GS_NO_CONFIG_ID)
- break;
- if (wIndex >= GS_MAX_NUM_INTERFACES
- || (dev->dev_config == GS_BULK_CONFIG_ID
- && wIndex != GS_BULK_INTERFACE_ID)) {
- ret = -EDOM;
- break;
- }
- /* no alternate interface settings */
- *(u8 *)req->buf = 0;
- ret = min(wLength, (u16)1);
- break;
-
- default:
- pr_err("gs_setup: unknown standard request, type=%02x, "
- "request=%02x, value=%04x, index=%04x, length=%d\n",
- ctrl->bRequestType, ctrl->bRequest,
- wValue, wIndex, wLength);
- break;
- }
-
- return ret;
-}
-
-static int gs_setup_class(struct usb_gadget *gadget,
- const struct usb_ctrlrequest *ctrl)
-{
- int ret = -EOPNOTSUPP;
- struct gs_dev *dev = get_gadget_data(gadget);
- struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
- struct usb_request *req = dev->dev_ctrl_req;
- u16 wIndex = le16_to_cpu(ctrl->wIndex);
- u16 wValue = le16_to_cpu(ctrl->wValue);
- u16 wLength = le16_to_cpu(ctrl->wLength);
-
- switch (ctrl->bRequest) {
- case USB_CDC_REQ_SET_LINE_CODING:
- /* FIXME Submit req to read the data; have its completion
- * handler copy that data to port->port_line_coding (iff
- * it's valid) and maybe pass it on. Until then, fail.
- */
- pr_warning("gs_setup: set_line_coding "
- "unuspported\n");
- break;
-
- case USB_CDC_REQ_GET_LINE_CODING:
- port = dev->dev_port[0]; /* ACM only has one port */
- ret = min(wLength,
- (u16)sizeof(struct usb_cdc_line_coding));
- if (port) {
- spin_lock(&port->port_lock);
- memcpy(req->buf, &port->port_line_coding, ret);
- spin_unlock(&port->port_lock);
- }
- break;
-
- case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
- /* FIXME Submit req to read the data; have its completion
- * handler use that to set the state (iff it's valid) and
- * maybe pass it on. Until then, fail.
- */
- pr_warning("gs_setup: set_control_line_state "
- "unuspported\n");
- break;
-
- default:
- pr_err("gs_setup: unknown class request, "
- "type=%02x, request=%02x, value=%04x, "
- "index=%04x, length=%d\n",
- ctrl->bRequestType, ctrl->bRequest,
- wValue, wIndex, wLength);
- break;
- }
-
- return ret;
-}
-
-/*
- * gs_setup_complete
- */
-static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
-{
- if (req->status || req->actual != req->length) {
- pr_err("gs_setup_complete: status error, status=%d, "
- "actual=%d, length=%d\n",
- req->status, req->actual, req->length);
- }
-}
-
-/*
- * gs_disconnect
- *
- * Called when the device is disconnected. Frees the closed
- * ports and disconnects open ports. Open ports will be freed
- * on close. Then reallocates the ports for the next connection.
- */
-static void gs_disconnect(struct usb_gadget *gadget)
-{
- unsigned long flags;
- struct gs_dev *dev = get_gadget_data(gadget);
-
- spin_lock_irqsave(&dev->dev_lock, flags);
-
- gs_reset_config(dev);
-
- /* free closed ports and disconnect open ports */
- /* (open ports will be freed when closed) */
- gs_free_ports(dev);
-
- /* re-allocate ports for the next connection */
- if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
- pr_err("gs_disconnect: cannot re-allocate ports\n");
-
- spin_unlock_irqrestore(&dev->dev_lock, flags);
-
- pr_info("gs_disconnect: %s disconnected\n", GS_LONG_NAME);
-}
-
-/*
- * gs_set_config
- *
- * Configures the device by enabling device specific
- * optimizations, setting up the endpoints, allocating
- * read and write requests and queuing read requests.
- *
- * The device lock must be held when calling this function.
- */
-static int gs_set_config(struct gs_dev *dev, unsigned config)
-{
- int i;
- int ret = 0;
- struct usb_gadget *gadget = dev->dev_gadget;
- struct usb_ep *ep;
- struct usb_endpoint_descriptor *ep_desc;
- struct usb_request *req;
- struct gs_req_entry *req_entry;
-
- if (dev == NULL) {
- pr_err("gs_set_config: NULL device pointer\n");
- return 0;
- }
-
- if (config == dev->dev_config)
- return 0;
-
- gs_reset_config(dev);
-
- switch (config) {
- case GS_NO_CONFIG_ID:
- return 0;
- case GS_BULK_CONFIG_ID:
- if (use_acm)
- return -EINVAL;
- /* device specific optimizations */
- if (gadget_is_net2280(gadget))
- net2280_set_fifo_mode(gadget, 1);
- break;
- case GS_ACM_CONFIG_ID:
- if (!use_acm)
- return -EINVAL;
- /* device specific optimizations */
- if (gadget_is_net2280(gadget))
- net2280_set_fifo_mode(gadget, 1);
- break;
- default:
- return -EINVAL;
- }
-
- dev->dev_config = config;
-
- gadget_for_each_ep(ep, gadget) {
-
- if (EP_NOTIFY_NAME
- && strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
- ep_desc = choose_ep_desc(gadget,
- &gs_highspeed_notify_desc,
- &gs_fullspeed_notify_desc);
- ret = usb_ep_enable(ep,ep_desc);
- if (ret == 0) {
- ep->driver_data = dev;
- dev->dev_notify_ep = ep;
- dev->dev_notify_ep_desc = ep_desc;
- } else {
- pr_err("gs_set_config: cannot enable NOTIFY "
- "endpoint %s, ret=%d\n",
- ep->name, ret);
- goto exit_reset_config;
- }
- }
-
- else if (strcmp(ep->name, EP_IN_NAME) == 0) {
- ep_desc = choose_ep_desc(gadget,
- &gs_highspeed_in_desc,
- &gs_fullspeed_in_desc);
- ret = usb_ep_enable(ep,ep_desc);
- if (ret == 0) {
- ep->driver_data = dev;
- dev->dev_in_ep = ep;
- dev->dev_in_ep_desc = ep_desc;
- } else {
- pr_err("gs_set_config: cannot enable IN "
- "endpoint %s, ret=%d\n",
- ep->name, ret);
- goto exit_reset_config;
- }
- }
-
- else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
- ep_desc = choose_ep_desc(gadget,
- &gs_highspeed_out_desc,
- &gs_fullspeed_out_desc);
- ret = usb_ep_enable(ep,ep_desc);
- if (ret == 0) {
- ep->driver_data = dev;
- dev->dev_out_ep = ep;
- dev->dev_out_ep_desc = ep_desc;
- } else {
- pr_err("gs_set_config: cannot enable OUT "
- "endpoint %s, ret=%d\n",
- ep->name, ret);
- goto exit_reset_config;
- }
- }
-
- }
-
- if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
- || (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
- pr_err("gs_set_config: cannot find endpoints\n");
- ret = -ENODEV;
- goto exit_reset_config;
- }
-
- /* allocate and queue read requests */
- ep = dev->dev_out_ep;
- for (i=0; i<read_q_size && ret == 0; i++) {
- if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
- req->complete = gs_read_complete;
- if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
- pr_err("gs_set_config: cannot queue read "
- "request, ret=%d\n", ret);
- }
- } else {
- pr_err("gs_set_config: cannot allocate "
- "read requests\n");
- ret = -ENOMEM;
- goto exit_reset_config;
- }
- }
-
- /* allocate write requests, and put on free list */
- ep = dev->dev_in_ep;
- for (i=0; i<write_q_size; i++) {
- if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
- req_entry->re_req->complete = gs_write_complete;
- list_add(&req_entry->re_entry, &dev->dev_req_list);
- } else {
- pr_err("gs_set_config: cannot allocate "
- "write requests\n");
- ret = -ENOMEM;
- goto exit_reset_config;
- }
- }
-
- pr_info("gs_set_config: %s configured, %s speed %s config\n",
- GS_LONG_NAME,
- gadget->speed == USB_SPEED_HIGH ? "high" : "full",
- config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
-
- return 0;
-
-exit_reset_config:
- gs_reset_config(dev);
- return ret;
-}
-
-/*
- * gs_reset_config
- *
- * Mark the device as not configured, disable all endpoints,
- * which forces completion of pending I/O and frees queued
- * requests, and free the remaining write requests on the
- * free list.
- *
- * The device lock must be held when calling this function.
- */
-static void gs_reset_config(struct gs_dev *dev)
-{
- struct gs_req_entry *req_entry;
-
- if (dev == NULL) {
- pr_err("gs_reset_config: NULL device pointer\n");
- return;
- }
-
- if (dev->dev_config == GS_NO_CONFIG_ID)
- return;
-
- dev->dev_config = GS_NO_CONFIG_ID;
-
- /* free write requests on the free list */
- while(!list_empty(&dev->dev_req_list)) {
- req_entry = list_entry(dev->dev_req_list.next,
- struct gs_req_entry, re_entry);
- list_del(&req_entry->re_entry);
- gs_free_req_entry(dev->dev_in_ep, req_entry);
- }
-
- /* disable endpoints, forcing completion of pending i/o; */
- /* completion handlers free their requests in this case */
- if (dev->dev_notify_ep) {
- usb_ep_disable(dev->dev_notify_ep);
- dev->dev_notify_ep = NULL;
- }
- if (dev->dev_in_ep) {
- usb_ep_disable(dev->dev_in_ep);
- dev->dev_in_ep = NULL;
- }
- if (dev->dev_out_ep) {
- usb_ep_disable(dev->dev_out_ep);
- dev->dev_out_ep = NULL;
- }
-}
-
-/*
- * gs_build_config_buf
- *
- * Builds the config descriptors in the given buffer and returns the
- * length, or a negative error number.
- */
-static int gs_build_config_buf(u8 *buf, struct usb_gadget *g,
- u8 type, unsigned int index, int is_otg)
-{
- int len;
- int high_speed = 0;
- const struct usb_config_descriptor *config_desc;
- const struct usb_descriptor_header **function;
-
- if (index >= gs_device_desc.bNumConfigurations)
- return -EINVAL;
-
- /* other speed switches high and full speed */
- if (gadget_is_dualspeed(g)) {
- high_speed = (g->speed == USB_SPEED_HIGH);
- if (type == USB_DT_OTHER_SPEED_CONFIG)
- high_speed = !high_speed;
- }
-
- if (use_acm) {
- config_desc = &gs_acm_config_desc;
- function = high_speed
- ? gs_acm_highspeed_function
- : gs_acm_fullspeed_function;
- } else {
- config_desc = &gs_bulk_config_desc;
- function = high_speed
- ? gs_bulk_highspeed_function
- : gs_bulk_fullspeed_function;
- }
-
- /* for now, don't advertise srp-only devices */
- if (!is_otg)
- function++;
-
- len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
- if (len < 0)
- return len;
-
- ((struct usb_config_descriptor *)buf)->bDescriptorType = type;
-
- return len;
-}
-
-/*
- * gs_alloc_req
- *
- * Allocate a usb_request and its buffer. Returns a pointer to the
- * usb_request or NULL if there is an error.
- */
-static struct usb_request *
-gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags)
-{
- struct usb_request *req;
-
- if (ep == NULL)
- return NULL;
-
- req = usb_ep_alloc_request(ep, kmalloc_flags);
-
- if (req != NULL) {
- req->length = len;
- req->buf = kmalloc(len, kmalloc_flags);
- if (req->buf == NULL) {
- usb_ep_free_request(ep, req);
- return NULL;
- }
- }
-
- return req;
-}
-
-/*
- * gs_free_req
- *
- * Free a usb_request and its buffer.
- */
-static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
-{
- if (ep != NULL && req != NULL) {
- kfree(req->buf);
- usb_ep_free_request(ep, req);
- }
-}
-
-/*
- * gs_alloc_req_entry
- *
- * Allocates a request and its buffer, using the given
- * endpoint, buffer len, and kmalloc flags.
- */
-static struct gs_req_entry *
-gs_alloc_req_entry(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
-{
- struct gs_req_entry *req;
-
- req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
- if (req == NULL)
- return NULL;
-
- req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
- if (req->re_req == NULL) {
- kfree(req);
- return NULL;
- }
-
- req->re_req->context = req;
-
- return req;
-}
-
-/*
- * gs_free_req_entry
- *
- * Frees a request and its buffer.
- */
-static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
-{
- if (ep != NULL && req != NULL) {
- if (req->re_req != NULL)
- gs_free_req(ep, req->re_req);
- kfree(req);
- }
-}
-
-/*
- * gs_alloc_ports
- *
- * Allocate all ports and set the gs_dev struct to point to them.
- * Return 0 if successful, or a negative error number.
- *
- * The device lock is normally held when calling this function.
- */
-static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
-{
- int i;
- struct gs_port *port;
-
- if (dev == NULL)
- return -EIO;
-
- for (i=0; i<GS_NUM_PORTS; i++) {
- if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
- return -ENOMEM;
-
- port->port_dev = dev;
- port->port_num = i;
- port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
- port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
- port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
- port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
- spin_lock_init(&port->port_lock);
- init_waitqueue_head(&port->port_write_wait);
-
- dev->dev_port[i] = port;
- }
-
- return 0;
-}
-
-/*
- * gs_free_ports
- *
- * Free all closed ports. Open ports are disconnected by
- * freeing their write buffers, setting their device pointers
- * and the pointers to them in the device to NULL. These
- * ports will be freed when closed.
- *
- * The device lock is normally held when calling this function.
- */
-static void gs_free_ports(struct gs_dev *dev)
-{
- int i;
- unsigned long flags;
- struct gs_port *port;
-
- if (dev == NULL)
- return;
-
- for (i=0; i<GS_NUM_PORTS; i++) {
- if ((port=dev->dev_port[i]) != NULL) {
- dev->dev_port[i] = NULL;
-
- spin_lock_irqsave(&port->port_lock, flags);
-
- if (port->port_write_buf != NULL) {
- gs_buf_free(port->port_write_buf);
- port->port_write_buf = NULL;
- }
-
- if (port->port_open_count > 0 || port->port_in_use) {
- port->port_dev = NULL;
- wake_up_interruptible(&port->port_write_wait);
- if (port->port_tty) {
- tty_hangup(port->port_tty);
- }
- spin_unlock_irqrestore(&port->port_lock, flags);
- } else {
- spin_unlock_irqrestore(&port->port_lock, flags);
- kfree(port);
- }
-
- }
- }
-}
-
-/* Circular Buffer */
-
-/*
- * gs_buf_alloc
- *
- * Allocate a circular buffer and all associated memory.
- */
-static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
-{
- struct gs_buf *gb;
-
- if (size == 0)
- return NULL;
-
- gb = kmalloc(sizeof(struct gs_buf), kmalloc_flags);
- if (gb == NULL)
- return NULL;
-
- gb->buf_buf = kmalloc(size, kmalloc_flags);
- if (gb->buf_buf == NULL) {
- kfree(gb);
- return NULL;
- }
-
- gb->buf_size = size;
- gb->buf_get = gb->buf_put = gb->buf_buf;
-
- return gb;
-}
-
-/*
- * gs_buf_free
- *
- * Free the buffer and all associated memory.
- */
-static void gs_buf_free(struct gs_buf *gb)
-{
- if (gb) {
- kfree(gb->buf_buf);
- kfree(gb);
- }
-}
-
-/*
- * gs_buf_clear
- *
- * Clear out all data in the circular buffer.
- */
-static void gs_buf_clear(struct gs_buf *gb)
-{
- if (gb != NULL)
- gb->buf_get = gb->buf_put;
- /* equivalent to a get of all data available */
-}
-
-/*
- * gs_buf_data_avail
- *
- * Return the number of bytes of data available in the circular
- * buffer.
- */
-static unsigned int gs_buf_data_avail(struct gs_buf *gb)
-{
- if (gb != NULL)
- return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
- else
- return 0;
-}
-
-/*
- * gs_buf_space_avail
- *
- * Return the number of bytes of space available in the circular
- * buffer.
- */
-static unsigned int gs_buf_space_avail(struct gs_buf *gb)
-{
- if (gb != NULL)
- return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
- else
- return 0;
-}
-
-/*
- * gs_buf_put
- *
- * Copy data data from a user buffer and put it into the circular buffer.
- * Restrict to the amount of space available.
- *
- * Return the number of bytes copied.
- */
-static unsigned int
-gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
-{
- unsigned int len;
-
- if (gb == NULL)
- return 0;
-
- len = gs_buf_space_avail(gb);
- if (count > len)
- count = len;
-
- if (count == 0)
- return 0;
-
- len = gb->buf_buf + gb->buf_size - gb->buf_put;
- if (count > len) {
- memcpy(gb->buf_put, buf, len);
- memcpy(gb->buf_buf, buf+len, count - len);
- gb->buf_put = gb->buf_buf + count - len;
- } else {
- memcpy(gb->buf_put, buf, count);
- if (count < len)
- gb->buf_put += count;
- else /* count == len */
- gb->buf_put = gb->buf_buf;
- }
-
- return count;
-}
-
-/*
- * gs_buf_get
- *
- * Get data from the circular buffer and copy to the given buffer.
- * Restrict to the amount of data available.
- *
- * Return the number of bytes copied.
- */
-static unsigned int
-gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
-{
- unsigned int len;
-
- if (gb == NULL)
- return 0;
-
- len = gs_buf_data_avail(gb);
- if (count > len)
- count = len;
-
- if (count == 0)
- return 0;
-
- len = gb->buf_buf + gb->buf_size - gb->buf_get;
- if (count > len) {
- memcpy(buf, gb->buf_get, len);
- memcpy(buf+len, gb->buf_buf, count - len);
- gb->buf_get = gb->buf_buf + count - len;
- } else {
- memcpy(buf, gb->buf_get, count);
- if (count < len)
- gb->buf_get += count;
- else /* count == len */
- gb->buf_get = gb->buf_buf;
- }
-
- return count;