mirror of https://gitee.com/openkylin/linux.git
280 lines
7.7 KiB
C
280 lines
7.7 KiB
C
/*
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* f_serial.c - generic USB serial function driver
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*
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* Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
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* Copyright (C) 2008 by David Brownell
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* Copyright (C) 2008 by Nokia Corporation
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*
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* This software is distributed under the terms of the GNU General
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* Public License ("GPL") as published by the Free Software Foundation,
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* either version 2 of that License or (at your option) any later version.
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*/
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include "u_serial.h"
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#include "gadget_chips.h"
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/*
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* This function packages a simple "generic serial" port with no real
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* control mechanisms, just raw data transfer over two bulk endpoints.
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*
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* Because it's not standardized, this isn't as interoperable as the
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* CDC ACM driver. However, for many purposes it's just as functional
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* if you can arrange appropriate host side drivers.
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*/
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struct f_gser {
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struct gserial port;
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u8 data_id;
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u8 port_num;
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};
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static inline struct f_gser *func_to_gser(struct usb_function *f)
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{
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return container_of(f, struct f_gser, port.func);
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}
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/*-------------------------------------------------------------------------*/
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/* interface descriptor: */
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static struct usb_interface_descriptor gser_interface_desc __initdata = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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/* .bInterfaceNumber = DYNAMIC */
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.bInterfaceSubClass = 0,
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.bInterfaceProtocol = 0,
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/* .iInterface = DYNAMIC */
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};
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/* full speed support: */
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static struct usb_endpoint_descriptor gser_fs_in_desc __initdata = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_endpoint_descriptor gser_fs_out_desc __initdata = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_descriptor_header *gser_fs_function[] __initdata = {
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(struct usb_descriptor_header *) &gser_interface_desc,
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(struct usb_descriptor_header *) &gser_fs_in_desc,
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(struct usb_descriptor_header *) &gser_fs_out_desc,
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NULL,
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};
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/* high speed support: */
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static struct usb_endpoint_descriptor gser_hs_in_desc __initdata = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = cpu_to_le16(512),
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};
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static struct usb_endpoint_descriptor gser_hs_out_desc __initdata = {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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.wMaxPacketSize = cpu_to_le16(512),
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};
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static struct usb_descriptor_header *gser_hs_function[] __initdata = {
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(struct usb_descriptor_header *) &gser_interface_desc,
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(struct usb_descriptor_header *) &gser_hs_in_desc,
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(struct usb_descriptor_header *) &gser_hs_out_desc,
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NULL,
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};
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/* string descriptors: */
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static struct usb_string gser_string_defs[] = {
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[0].s = "Generic Serial",
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{ } /* end of list */
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};
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static struct usb_gadget_strings gser_string_table = {
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.language = 0x0409, /* en-us */
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.strings = gser_string_defs,
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};
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static struct usb_gadget_strings *gser_strings[] = {
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&gser_string_table,
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NULL,
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};
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/*-------------------------------------------------------------------------*/
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static int gser_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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{
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struct f_gser *gser = func_to_gser(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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/* we know alt == 0, so this is an activation or a reset */
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if (gser->port.in->driver_data) {
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DBG(cdev, "reset generic ttyGS%d\n", gser->port_num);
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gserial_disconnect(&gser->port);
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}
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if (!gser->port.in->desc || !gser->port.out->desc) {
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DBG(cdev, "activate generic ttyGS%d\n", gser->port_num);
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if (!config_ep_by_speed(cdev->gadget, f, gser->port.in) ||
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!config_ep_by_speed(cdev->gadget, f, gser->port.out)) {
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gser->port.in->desc = NULL;
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gser->port.out->desc = NULL;
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return -EINVAL;
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}
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}
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gserial_connect(&gser->port, gser->port_num);
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return 0;
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}
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static void gser_disable(struct usb_function *f)
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{
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struct f_gser *gser = func_to_gser(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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DBG(cdev, "generic ttyGS%d deactivated\n", gser->port_num);
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gserial_disconnect(&gser->port);
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}
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/*-------------------------------------------------------------------------*/
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/* serial function driver setup/binding */
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static int __init
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gser_bind(struct usb_configuration *c, struct usb_function *f)
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{
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struct usb_composite_dev *cdev = c->cdev;
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struct f_gser *gser = func_to_gser(f);
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int status;
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struct usb_ep *ep;
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/* allocate instance-specific interface IDs */
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status = usb_interface_id(c, f);
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if (status < 0)
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goto fail;
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gser->data_id = status;
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gser_interface_desc.bInterfaceNumber = status;
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status = -ENODEV;
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/* allocate instance-specific endpoints */
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ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_in_desc);
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if (!ep)
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goto fail;
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gser->port.in = ep;
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ep->driver_data = cdev; /* claim */
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ep = usb_ep_autoconfig(cdev->gadget, &gser_fs_out_desc);
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if (!ep)
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goto fail;
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gser->port.out = ep;
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ep->driver_data = cdev; /* claim */
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/* copy descriptors, and track endpoint copies */
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f->descriptors = usb_copy_descriptors(gser_fs_function);
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/* support all relevant hardware speeds... we expect that when
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* hardware is dual speed, all bulk-capable endpoints work at
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* both speeds
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*/
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if (gadget_is_dualspeed(c->cdev->gadget)) {
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gser_hs_in_desc.bEndpointAddress =
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gser_fs_in_desc.bEndpointAddress;
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gser_hs_out_desc.bEndpointAddress =
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gser_fs_out_desc.bEndpointAddress;
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/* copy descriptors, and track endpoint copies */
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f->hs_descriptors = usb_copy_descriptors(gser_hs_function);
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}
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DBG(cdev, "generic ttyGS%d: %s speed IN/%s OUT/%s\n",
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gser->port_num,
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gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
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gser->port.in->name, gser->port.out->name);
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return 0;
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fail:
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/* we might as well release our claims on endpoints */
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if (gser->port.out)
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gser->port.out->driver_data = NULL;
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if (gser->port.in)
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gser->port.in->driver_data = NULL;
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ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
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return status;
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}
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static void
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gser_unbind(struct usb_configuration *c, struct usb_function *f)
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{
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if (gadget_is_dualspeed(c->cdev->gadget))
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usb_free_descriptors(f->hs_descriptors);
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usb_free_descriptors(f->descriptors);
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kfree(func_to_gser(f));
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}
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/**
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* gser_bind_config - add a generic serial function to a configuration
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* @c: the configuration to support the serial instance
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* @port_num: /dev/ttyGS* port this interface will use
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* Context: single threaded during gadget setup
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*
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* Returns zero on success, else negative errno.
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*
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* Caller must have called @gserial_setup() with enough ports to
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* handle all the ones it binds. Caller is also responsible
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* for calling @gserial_cleanup() before module unload.
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*/
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int __init gser_bind_config(struct usb_configuration *c, u8 port_num)
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{
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struct f_gser *gser;
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int status;
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/* REVISIT might want instance-specific strings to help
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* distinguish instances ...
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*/
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/* maybe allocate device-global string ID */
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if (gser_string_defs[0].id == 0) {
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status = usb_string_id(c->cdev);
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if (status < 0)
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return status;
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gser_string_defs[0].id = status;
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}
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/* allocate and initialize one new instance */
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gser = kzalloc(sizeof *gser, GFP_KERNEL);
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if (!gser)
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return -ENOMEM;
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gser->port_num = port_num;
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gser->port.func.name = "gser";
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gser->port.func.strings = gser_strings;
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gser->port.func.bind = gser_bind;
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gser->port.func.unbind = gser_unbind;
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gser->port.func.set_alt = gser_set_alt;
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gser->port.func.disable = gser_disable;
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status = usb_add_function(c, &gser->port.func);
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if (status)
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kfree(gser);
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return status;
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}
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