mirror of https://gitee.com/openkylin/linux.git
2343 lines
58 KiB
C
2343 lines
58 KiB
C
/*
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* g_serial.c -- USB gadget serial driver
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*
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* Copyright 2003 (C) Al Borchers (alborchers@steinerpoint.com)
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*
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* This code is based in part on the Gadget Zero driver, which
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* is Copyright (C) 2003 by David Brownell, all rights reserved.
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*
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* This code also borrows from usbserial.c, which is
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* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2000 Peter Berger (pberger@brimson.com)
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* Copyright (C) 2000 Al Borchers (alborchers@steinerpoint.com)
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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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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/timer.h>
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#include <linux/list.h>
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#include <linux/interrupt.h>
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#include <linux/utsname.h>
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#include <linux/wait.h>
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#include <linux/proc_fs.h>
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#include <linux/device.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <asm/byteorder.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/system.h>
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#include <asm/unaligned.h>
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#include <asm/uaccess.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb_gadget.h>
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#include "gadget_chips.h"
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/* Defines */
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#define GS_VERSION_STR "v2.2"
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#define GS_VERSION_NUM 0x0202
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#define GS_LONG_NAME "Gadget Serial"
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#define GS_SHORT_NAME "g_serial"
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#define GS_MAJOR 127
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#define GS_MINOR_START 0
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#define GS_NUM_PORTS 16
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#define GS_NUM_CONFIGS 1
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#define GS_NO_CONFIG_ID 0
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#define GS_BULK_CONFIG_ID 1
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#define GS_ACM_CONFIG_ID 2
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#define GS_MAX_NUM_INTERFACES 2
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#define GS_BULK_INTERFACE_ID 0
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#define GS_CONTROL_INTERFACE_ID 0
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#define GS_DATA_INTERFACE_ID 1
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#define GS_MAX_DESC_LEN 256
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#define GS_DEFAULT_READ_Q_SIZE 32
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#define GS_DEFAULT_WRITE_Q_SIZE 32
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#define GS_DEFAULT_WRITE_BUF_SIZE 8192
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#define GS_TMP_BUF_SIZE 8192
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#define GS_CLOSE_TIMEOUT 15
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#define GS_DEFAULT_USE_ACM 0
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#define GS_DEFAULT_DTE_RATE 9600
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#define GS_DEFAULT_DATA_BITS 8
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#define GS_DEFAULT_PARITY USB_CDC_NO_PARITY
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#define GS_DEFAULT_CHAR_FORMAT USB_CDC_1_STOP_BITS
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/* select highspeed/fullspeed, hiding highspeed if not configured */
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#ifdef CONFIG_USB_GADGET_DUALSPEED
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#define GS_SPEED_SELECT(is_hs,hs,fs) ((is_hs) ? (hs) : (fs))
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#else
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#define GS_SPEED_SELECT(is_hs,hs,fs) (fs)
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#endif /* CONFIG_USB_GADGET_DUALSPEED */
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/* debug settings */
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#ifdef GS_DEBUG
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static int debug = 1;
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#define gs_debug(format, arg...) \
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do { if (debug) printk(KERN_DEBUG format, ## arg); } while(0)
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#define gs_debug_level(level, format, arg...) \
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do { if (debug>=level) printk(KERN_DEBUG format, ## arg); } while(0)
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#else
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#define gs_debug(format, arg...) \
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do { } while(0)
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#define gs_debug_level(level, format, arg...) \
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do { } while(0)
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#endif /* GS_DEBUG */
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/* Thanks to NetChip Technologies for donating this product ID.
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*
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* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
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* Instead: allocate your own, using normal USB-IF procedures.
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*/
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#define GS_VENDOR_ID 0x0525 /* NetChip */
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#define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
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#define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
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#define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
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#define GS_NOTIFY_MAXPACKET 8
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/* Structures */
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struct gs_dev;
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/* circular buffer */
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struct gs_buf {
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unsigned int buf_size;
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char *buf_buf;
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char *buf_get;
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char *buf_put;
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};
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/* list of requests */
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struct gs_req_entry {
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struct list_head re_entry;
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struct usb_request *re_req;
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};
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/* the port structure holds info for each port, one for each minor number */
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struct gs_port {
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struct gs_dev *port_dev; /* pointer to device struct */
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struct tty_struct *port_tty; /* pointer to tty struct */
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spinlock_t port_lock;
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int port_num;
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int port_open_count;
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int port_in_use; /* open/close in progress */
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wait_queue_head_t port_write_wait;/* waiting to write */
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struct gs_buf *port_write_buf;
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struct usb_cdc_line_coding port_line_coding;
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};
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/* the device structure holds info for the USB device */
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struct gs_dev {
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struct usb_gadget *dev_gadget; /* gadget device pointer */
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spinlock_t dev_lock; /* lock for set/reset config */
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int dev_config; /* configuration number */
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struct usb_ep *dev_notify_ep; /* address of notify endpoint */
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struct usb_ep *dev_in_ep; /* address of in endpoint */
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struct usb_ep *dev_out_ep; /* address of out endpoint */
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struct usb_endpoint_descriptor /* descriptor of notify ep */
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*dev_notify_ep_desc;
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struct usb_endpoint_descriptor /* descriptor of in endpoint */
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*dev_in_ep_desc;
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struct usb_endpoint_descriptor /* descriptor of out endpoint */
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*dev_out_ep_desc;
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struct usb_request *dev_ctrl_req; /* control request */
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struct list_head dev_req_list; /* list of write requests */
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int dev_sched_port; /* round robin port scheduled */
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struct gs_port *dev_port[GS_NUM_PORTS]; /* the ports */
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};
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/* Functions */
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/* module */
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static int __init gs_module_init(void);
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static void __exit gs_module_exit(void);
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/* tty driver */
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static int gs_open(struct tty_struct *tty, struct file *file);
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static void gs_close(struct tty_struct *tty, struct file *file);
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static int gs_write(struct tty_struct *tty,
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const unsigned char *buf, int count);
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static void gs_put_char(struct tty_struct *tty, unsigned char ch);
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static void gs_flush_chars(struct tty_struct *tty);
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static int gs_write_room(struct tty_struct *tty);
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static int gs_chars_in_buffer(struct tty_struct *tty);
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static void gs_throttle(struct tty_struct * tty);
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static void gs_unthrottle(struct tty_struct * tty);
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static void gs_break(struct tty_struct *tty, int break_state);
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static int gs_ioctl(struct tty_struct *tty, struct file *file,
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unsigned int cmd, unsigned long arg);
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static void gs_set_termios(struct tty_struct *tty, struct ktermios *old);
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static int gs_send(struct gs_dev *dev);
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static int gs_send_packet(struct gs_dev *dev, char *packet,
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unsigned int size);
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static int gs_recv_packet(struct gs_dev *dev, char *packet,
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unsigned int size);
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static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
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static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
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/* gadget driver */
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static int gs_bind(struct usb_gadget *gadget);
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static void gs_unbind(struct usb_gadget *gadget);
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static int gs_setup(struct usb_gadget *gadget,
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const struct usb_ctrlrequest *ctrl);
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static int gs_setup_standard(struct usb_gadget *gadget,
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const struct usb_ctrlrequest *ctrl);
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static int gs_setup_class(struct usb_gadget *gadget,
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const struct usb_ctrlrequest *ctrl);
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static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
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static void gs_disconnect(struct usb_gadget *gadget);
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static int gs_set_config(struct gs_dev *dev, unsigned config);
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static void gs_reset_config(struct gs_dev *dev);
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static int gs_build_config_buf(u8 *buf, enum usb_device_speed speed,
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u8 type, unsigned int index, int is_otg);
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static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
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gfp_t kmalloc_flags);
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static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
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static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
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gfp_t kmalloc_flags);
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static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
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static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
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static void gs_free_ports(struct gs_dev *dev);
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/* circular buffer */
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static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
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static void gs_buf_free(struct gs_buf *gb);
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static void gs_buf_clear(struct gs_buf *gb);
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static unsigned int gs_buf_data_avail(struct gs_buf *gb);
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static unsigned int gs_buf_space_avail(struct gs_buf *gb);
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static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
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unsigned int count);
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static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
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unsigned int count);
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/* external functions */
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extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
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/* Globals */
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static struct gs_dev *gs_device;
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static const char *EP_IN_NAME;
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static const char *EP_OUT_NAME;
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static const char *EP_NOTIFY_NAME;
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static struct semaphore gs_open_close_sem[GS_NUM_PORTS];
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static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
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static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
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static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
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static unsigned int use_acm = GS_DEFAULT_USE_ACM;
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/* tty driver struct */
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static const struct tty_operations gs_tty_ops = {
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.open = gs_open,
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.close = gs_close,
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.write = gs_write,
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.put_char = gs_put_char,
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.flush_chars = gs_flush_chars,
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.write_room = gs_write_room,
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.ioctl = gs_ioctl,
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.set_termios = gs_set_termios,
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.throttle = gs_throttle,
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.unthrottle = gs_unthrottle,
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.break_ctl = gs_break,
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.chars_in_buffer = gs_chars_in_buffer,
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};
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static struct tty_driver *gs_tty_driver;
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/* gadget driver struct */
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static struct usb_gadget_driver gs_gadget_driver = {
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#ifdef CONFIG_USB_GADGET_DUALSPEED
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.speed = USB_SPEED_HIGH,
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#else
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.speed = USB_SPEED_FULL,
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#endif /* CONFIG_USB_GADGET_DUALSPEED */
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.function = GS_LONG_NAME,
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.bind = gs_bind,
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.unbind = gs_unbind,
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.setup = gs_setup,
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.disconnect = gs_disconnect,
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.driver = {
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.name = GS_SHORT_NAME,
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},
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};
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/* USB descriptors */
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#define GS_MANUFACTURER_STR_ID 1
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#define GS_PRODUCT_STR_ID 2
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#define GS_SERIAL_STR_ID 3
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#define GS_BULK_CONFIG_STR_ID 4
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#define GS_ACM_CONFIG_STR_ID 5
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#define GS_CONTROL_STR_ID 6
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#define GS_DATA_STR_ID 7
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/* static strings, in UTF-8 */
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static char manufacturer[50];
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static struct usb_string gs_strings[] = {
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{ GS_MANUFACTURER_STR_ID, manufacturer },
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{ GS_PRODUCT_STR_ID, GS_LONG_NAME },
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{ GS_SERIAL_STR_ID, "0" },
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{ GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
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{ GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
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{ GS_CONTROL_STR_ID, "Gadget Serial Control" },
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{ GS_DATA_STR_ID, "Gadget Serial Data" },
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{ } /* end of list */
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};
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static struct usb_gadget_strings gs_string_table = {
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.language = 0x0409, /* en-us */
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.strings = gs_strings,
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};
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static struct usb_device_descriptor gs_device_desc = {
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.bLength = USB_DT_DEVICE_SIZE,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = __constant_cpu_to_le16(0x0200),
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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.idVendor = __constant_cpu_to_le16(GS_VENDOR_ID),
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.idProduct = __constant_cpu_to_le16(GS_PRODUCT_ID),
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.iManufacturer = GS_MANUFACTURER_STR_ID,
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.iProduct = GS_PRODUCT_STR_ID,
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.iSerialNumber = GS_SERIAL_STR_ID,
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.bNumConfigurations = GS_NUM_CONFIGS,
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};
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static struct usb_otg_descriptor gs_otg_descriptor = {
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.bLength = sizeof(gs_otg_descriptor),
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.bDescriptorType = USB_DT_OTG,
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.bmAttributes = USB_OTG_SRP,
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};
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static struct usb_config_descriptor gs_bulk_config_desc = {
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.bLength = USB_DT_CONFIG_SIZE,
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.bDescriptorType = USB_DT_CONFIG,
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/* .wTotalLength computed dynamically */
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.bNumInterfaces = 1,
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.bConfigurationValue = GS_BULK_CONFIG_ID,
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.iConfiguration = GS_BULK_CONFIG_STR_ID,
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.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
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.bMaxPower = 1,
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};
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static struct usb_config_descriptor gs_acm_config_desc = {
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.bLength = USB_DT_CONFIG_SIZE,
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.bDescriptorType = USB_DT_CONFIG,
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/* .wTotalLength computed dynamically */
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.bNumInterfaces = 2,
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.bConfigurationValue = GS_ACM_CONFIG_ID,
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.iConfiguration = GS_ACM_CONFIG_STR_ID,
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.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
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.bMaxPower = 1,
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};
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static const struct usb_interface_descriptor gs_bulk_interface_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = GS_BULK_INTERFACE_ID,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_CDC_DATA,
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.bInterfaceSubClass = 0,
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.bInterfaceProtocol = 0,
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.iInterface = GS_DATA_STR_ID,
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};
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static const struct usb_interface_descriptor gs_control_interface_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = GS_CONTROL_INTERFACE_ID,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_COMM,
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.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
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.bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
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.iInterface = GS_CONTROL_STR_ID,
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};
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static const struct usb_interface_descriptor gs_data_interface_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = GS_DATA_INTERFACE_ID,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_CDC_DATA,
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.bInterfaceSubClass = 0,
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.bInterfaceProtocol = 0,
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.iInterface = GS_DATA_STR_ID,
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};
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static const struct usb_cdc_header_desc gs_header_desc = {
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.bLength = sizeof(gs_header_desc),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_HEADER_TYPE,
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.bcdCDC = __constant_cpu_to_le16(0x0110),
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};
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static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
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.bLength = sizeof(gs_call_mgmt_descriptor),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
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.bmCapabilities = 0,
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.bDataInterface = 1, /* index of data interface */
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};
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static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
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.bLength = sizeof(gs_acm_descriptor),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_ACM_TYPE,
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.bmCapabilities = 0,
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};
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static const struct usb_cdc_union_desc gs_union_desc = {
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.bLength = sizeof(gs_union_desc),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubType = USB_CDC_UNION_TYPE,
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.bMasterInterface0 = 0, /* index of control interface */
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.bSlaveInterface0 = 1, /* index of data interface */
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};
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static struct usb_endpoint_descriptor gs_fullspeed_notify_desc = {
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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_INT,
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.wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
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.bInterval = 1 << GS_LOG2_NOTIFY_INTERVAL,
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};
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static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
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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 gs_fullspeed_out_desc = {
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bEndpointAddress = USB_DIR_OUT,
|
|
.bmAttributes = USB_ENDPOINT_XFER_BULK,
|
|
};
|
|
|
|
static const struct usb_descriptor_header *gs_bulk_fullspeed_function[] = {
|
|
(struct usb_descriptor_header *) &gs_otg_descriptor,
|
|
(struct usb_descriptor_header *) &gs_bulk_interface_desc,
|
|
(struct usb_descriptor_header *) &gs_fullspeed_in_desc,
|
|
(struct usb_descriptor_header *) &gs_fullspeed_out_desc,
|
|
NULL,
|
|
};
|
|
|
|
static const struct usb_descriptor_header *gs_acm_fullspeed_function[] = {
|
|
(struct usb_descriptor_header *) &gs_otg_descriptor,
|
|
(struct usb_descriptor_header *) &gs_control_interface_desc,
|
|
(struct usb_descriptor_header *) &gs_header_desc,
|
|
(struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
|
|
(struct usb_descriptor_header *) &gs_acm_descriptor,
|
|
(struct usb_descriptor_header *) &gs_union_desc,
|
|
(struct usb_descriptor_header *) &gs_fullspeed_notify_desc,
|
|
(struct usb_descriptor_header *) &gs_data_interface_desc,
|
|
(struct usb_descriptor_header *) &gs_fullspeed_in_desc,
|
|
(struct usb_descriptor_header *) &gs_fullspeed_out_desc,
|
|
NULL,
|
|
};
|
|
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
static struct usb_endpoint_descriptor gs_highspeed_notify_desc = {
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bEndpointAddress = USB_DIR_IN,
|
|
.bmAttributes = USB_ENDPOINT_XFER_INT,
|
|
.wMaxPacketSize = __constant_cpu_to_le16(GS_NOTIFY_MAXPACKET),
|
|
.bInterval = GS_LOG2_NOTIFY_INTERVAL+4,
|
|
};
|
|
|
|
static struct usb_endpoint_descriptor gs_highspeed_in_desc = {
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bmAttributes = USB_ENDPOINT_XFER_BULK,
|
|
.wMaxPacketSize = __constant_cpu_to_le16(512),
|
|
};
|
|
|
|
static struct usb_endpoint_descriptor gs_highspeed_out_desc = {
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bmAttributes = USB_ENDPOINT_XFER_BULK,
|
|
.wMaxPacketSize = __constant_cpu_to_le16(512),
|
|
};
|
|
|
|
static struct usb_qualifier_descriptor gs_qualifier_desc = {
|
|
.bLength = sizeof(struct usb_qualifier_descriptor),
|
|
.bDescriptorType = USB_DT_DEVICE_QUALIFIER,
|
|
.bcdUSB = __constant_cpu_to_le16 (0x0200),
|
|
/* assumes ep0 uses the same value for both speeds ... */
|
|
.bNumConfigurations = GS_NUM_CONFIGS,
|
|
};
|
|
|
|
static const struct usb_descriptor_header *gs_bulk_highspeed_function[] = {
|
|
(struct usb_descriptor_header *) &gs_otg_descriptor,
|
|
(struct usb_descriptor_header *) &gs_bulk_interface_desc,
|
|
(struct usb_descriptor_header *) &gs_highspeed_in_desc,
|
|
(struct usb_descriptor_header *) &gs_highspeed_out_desc,
|
|
NULL,
|
|
};
|
|
|
|
static const struct usb_descriptor_header *gs_acm_highspeed_function[] = {
|
|
(struct usb_descriptor_header *) &gs_otg_descriptor,
|
|
(struct usb_descriptor_header *) &gs_control_interface_desc,
|
|
(struct usb_descriptor_header *) &gs_header_desc,
|
|
(struct usb_descriptor_header *) &gs_call_mgmt_descriptor,
|
|
(struct usb_descriptor_header *) &gs_acm_descriptor,
|
|
(struct usb_descriptor_header *) &gs_union_desc,
|
|
(struct usb_descriptor_header *) &gs_highspeed_notify_desc,
|
|
(struct usb_descriptor_header *) &gs_data_interface_desc,
|
|
(struct usb_descriptor_header *) &gs_highspeed_in_desc,
|
|
(struct usb_descriptor_header *) &gs_highspeed_out_desc,
|
|
NULL,
|
|
};
|
|
|
|
#endif /* CONFIG_USB_GADGET_DUALSPEED */
|
|
|
|
|
|
/* Module */
|
|
MODULE_DESCRIPTION(GS_LONG_NAME);
|
|
MODULE_AUTHOR("Al Borchers");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#ifdef GS_DEBUG
|
|
module_param(debug, int, S_IRUGO|S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Enable debugging, 0=off, 1=on");
|
|
#endif
|
|
|
|
module_param(read_q_size, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(read_q_size, "Read request queue size, default=32");
|
|
|
|
module_param(write_q_size, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(write_q_size, "Write request queue size, default=32");
|
|
|
|
module_param(write_buf_size, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(write_buf_size, "Write buffer size, default=8192");
|
|
|
|
module_param(use_acm, uint, S_IRUGO);
|
|
MODULE_PARM_DESC(use_acm, "Use CDC ACM, 0=no, 1=yes, default=no");
|
|
|
|
module_init(gs_module_init);
|
|
module_exit(gs_module_exit);
|
|
|
|
/*
|
|
* gs_module_init
|
|
*
|
|
* Register as a USB gadget driver and a tty driver.
|
|
*/
|
|
static int __init gs_module_init(void)
|
|
{
|
|
int i;
|
|
int retval;
|
|
|
|
retval = usb_gadget_register_driver(&gs_gadget_driver);
|
|
if (retval) {
|
|
printk(KERN_ERR "gs_module_init: cannot register gadget driver, ret=%d\n", retval);
|
|
return retval;
|
|
}
|
|
|
|
gs_tty_driver = alloc_tty_driver(GS_NUM_PORTS);
|
|
if (!gs_tty_driver)
|
|
return -ENOMEM;
|
|
gs_tty_driver->owner = THIS_MODULE;
|
|
gs_tty_driver->driver_name = GS_SHORT_NAME;
|
|
gs_tty_driver->name = "ttygs";
|
|
gs_tty_driver->major = GS_MAJOR;
|
|
gs_tty_driver->minor_start = GS_MINOR_START;
|
|
gs_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
|
|
gs_tty_driver->subtype = SERIAL_TYPE_NORMAL;
|
|
gs_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
|
|
gs_tty_driver->init_termios = tty_std_termios;
|
|
gs_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
|
|
tty_set_operations(gs_tty_driver, &gs_tty_ops);
|
|
|
|
for (i=0; i < GS_NUM_PORTS; i++)
|
|
sema_init(&gs_open_close_sem[i], 1);
|
|
|
|
retval = tty_register_driver(gs_tty_driver);
|
|
if (retval) {
|
|
usb_gadget_unregister_driver(&gs_gadget_driver);
|
|
put_tty_driver(gs_tty_driver);
|
|
printk(KERN_ERR "gs_module_init: cannot register tty driver, ret=%d\n", retval);
|
|
return retval;
|
|
}
|
|
|
|
printk(KERN_INFO "gs_module_init: %s %s loaded\n", GS_LONG_NAME, GS_VERSION_STR);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* gs_module_exit
|
|
*
|
|
* Unregister as a tty driver and a USB gadget driver.
|
|
*/
|
|
static void __exit gs_module_exit(void)
|
|
{
|
|
tty_unregister_driver(gs_tty_driver);
|
|
put_tty_driver(gs_tty_driver);
|
|
usb_gadget_unregister_driver(&gs_gadget_driver);
|
|
|
|
printk(KERN_INFO "gs_module_exit: %s %s unloaded\n", GS_LONG_NAME, GS_VERSION_STR);
|
|
}
|
|
|
|
/* TTY Driver */
|
|
|
|
/*
|
|
* gs_open
|
|
*/
|
|
static int gs_open(struct tty_struct *tty, struct file *file)
|
|
{
|
|
int port_num;
|
|
unsigned long flags;
|
|
struct gs_port *port;
|
|
struct gs_dev *dev;
|
|
struct gs_buf *buf;
|
|
struct semaphore *sem;
|
|
int ret;
|
|
|
|
port_num = tty->index;
|
|
|
|
gs_debug("gs_open: (%d,%p,%p)\n", port_num, tty, file);
|
|
|
|
if (port_num < 0 || port_num >= GS_NUM_PORTS) {
|
|
printk(KERN_ERR "gs_open: (%d,%p,%p) invalid port number\n",
|
|
port_num, tty, file);
|
|
return -ENODEV;
|
|
}
|
|
|
|
dev = gs_device;
|
|
|
|
if (dev == NULL) {
|
|
printk(KERN_ERR "gs_open: (%d,%p,%p) NULL device pointer\n",
|
|
port_num, tty, file);
|
|
return -ENODEV;
|
|
}
|
|
|
|
sem = &gs_open_close_sem[port_num];
|
|
if (down_interruptible(sem)) {
|
|
printk(KERN_ERR
|
|
"gs_open: (%d,%p,%p) interrupted waiting for semaphore\n",
|
|
port_num, tty, file);
|
|
return -ERESTARTSYS;
|
|
}
|
|
|
|
spin_lock_irqsave(&dev->dev_lock, flags);
|
|
|
|
if (dev->dev_config == GS_NO_CONFIG_ID) {
|
|
printk(KERN_ERR
|
|
"gs_open: (%d,%p,%p) device is not connected\n",
|
|
port_num, tty, file);
|
|
ret = -ENODEV;
|
|
goto exit_unlock_dev;
|
|
}
|
|
|
|
port = dev->dev_port[port_num];
|
|
|
|
if (port == NULL) {
|
|
printk(KERN_ERR "gs_open: (%d,%p,%p) NULL port pointer\n",
|
|
port_num, tty, file);
|
|
ret = -ENODEV;
|
|
goto exit_unlock_dev;
|
|
}
|
|
|
|
spin_lock(&port->port_lock);
|
|
spin_unlock(&dev->dev_lock);
|
|
|
|
if (port->port_dev == NULL) {
|
|
printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (1)\n",
|
|
port_num, tty, file);
|
|
ret = -EIO;
|
|
goto exit_unlock_port;
|
|
}
|
|
|
|
if (port->port_open_count > 0) {
|
|
++port->port_open_count;
|
|
gs_debug("gs_open: (%d,%p,%p) already open\n",
|
|
port_num, tty, file);
|
|
ret = 0;
|
|
goto exit_unlock_port;
|
|
}
|
|
|
|
tty->driver_data = NULL;
|
|
|
|
/* mark port as in use, we can drop port lock and sleep if necessary */
|
|
port->port_in_use = 1;
|
|
|
|
/* allocate write buffer on first open */
|
|
if (port->port_write_buf == NULL) {
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
buf = gs_buf_alloc(write_buf_size, GFP_KERNEL);
|
|
spin_lock_irqsave(&port->port_lock, flags);
|
|
|
|
/* might have been disconnected while asleep, check */
|
|
if (port->port_dev == NULL) {
|
|
printk(KERN_ERR
|
|
"gs_open: (%d,%p,%p) port disconnected (2)\n",
|
|
port_num, tty, file);
|
|
port->port_in_use = 0;
|
|
ret = -EIO;
|
|
goto exit_unlock_port;
|
|
}
|
|
|
|
if ((port->port_write_buf=buf) == NULL) {
|
|
printk(KERN_ERR "gs_open: (%d,%p,%p) cannot allocate port write buffer\n",
|
|
port_num, tty, file);
|
|
port->port_in_use = 0;
|
|
ret = -ENOMEM;
|
|
goto exit_unlock_port;
|
|
}
|
|
|
|
}
|
|
|
|
/* wait for carrier detect (not implemented) */
|
|
|
|
/* might have been disconnected while asleep, check */
|
|
if (port->port_dev == NULL) {
|
|
printk(KERN_ERR "gs_open: (%d,%p,%p) port disconnected (3)\n",
|
|
port_num, tty, file);
|
|
port->port_in_use = 0;
|
|
ret = -EIO;
|
|
goto exit_unlock_port;
|
|
}
|
|
|
|
tty->driver_data = port;
|
|
port->port_tty = tty;
|
|
port->port_open_count = 1;
|
|
port->port_in_use = 0;
|
|
|
|
gs_debug("gs_open: (%d,%p,%p) completed\n", port_num, tty, file);
|
|
|
|
ret = 0;
|
|
|
|
exit_unlock_port:
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
up(sem);
|
|
return ret;
|
|
|
|
exit_unlock_dev:
|
|
spin_unlock_irqrestore(&dev->dev_lock, flags);
|
|
up(sem);
|
|
return ret;
|
|
|
|
}
|
|
|
|
/*
|
|
* gs_close
|
|
*/
|
|
|
|
#define GS_WRITE_FINISHED_EVENT_SAFELY(p) \
|
|
({ \
|
|
int cond; \
|
|
\
|
|
spin_lock_irq(&(p)->port_lock); \
|
|
cond = !(p)->port_dev || !gs_buf_data_avail((p)->port_write_buf); \
|
|
spin_unlock_irq(&(p)->port_lock); \
|
|
cond; \
|
|
})
|
|
|
|
static void gs_close(struct tty_struct *tty, struct file *file)
|
|
{
|
|
struct gs_port *port = tty->driver_data;
|
|
struct semaphore *sem;
|
|
|
|
if (port == NULL) {
|
|
printk(KERN_ERR "gs_close: NULL port pointer\n");
|
|
return;
|
|
}
|
|
|
|
gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
|
|
|
|
sem = &gs_open_close_sem[port->port_num];
|
|
down(sem);
|
|
|
|
spin_lock_irq(&port->port_lock);
|
|
|
|
if (port->port_open_count == 0) {
|
|
printk(KERN_ERR
|
|
"gs_close: (%d,%p,%p) port is already closed\n",
|
|
port->port_num, tty, file);
|
|
goto exit;
|
|
}
|
|
|
|
if (port->port_open_count > 1) {
|
|
--port->port_open_count;
|
|
goto exit;
|
|
}
|
|
|
|
/* free disconnected port on final close */
|
|
if (port->port_dev == NULL) {
|
|
kfree(port);
|
|
goto exit;
|
|
}
|
|
|
|
/* mark port as closed but in use, we can drop port lock */
|
|
/* and sleep if necessary */
|
|
port->port_in_use = 1;
|
|
port->port_open_count = 0;
|
|
|
|
/* wait for write buffer to drain, or */
|
|
/* at most GS_CLOSE_TIMEOUT seconds */
|
|
if (gs_buf_data_avail(port->port_write_buf) > 0) {
|
|
spin_unlock_irq(&port->port_lock);
|
|
wait_event_interruptible_timeout(port->port_write_wait,
|
|
GS_WRITE_FINISHED_EVENT_SAFELY(port),
|
|
GS_CLOSE_TIMEOUT * HZ);
|
|
spin_lock_irq(&port->port_lock);
|
|
}
|
|
|
|
/* free disconnected port on final close */
|
|
/* (might have happened during the above sleep) */
|
|
if (port->port_dev == NULL) {
|
|
kfree(port);
|
|
goto exit;
|
|
}
|
|
|
|
gs_buf_clear(port->port_write_buf);
|
|
|
|
tty->driver_data = NULL;
|
|
port->port_tty = NULL;
|
|
port->port_in_use = 0;
|
|
|
|
gs_debug("gs_close: (%d,%p,%p) completed\n",
|
|
port->port_num, tty, file);
|
|
|
|
exit:
|
|
spin_unlock_irq(&port->port_lock);
|
|
up(sem);
|
|
}
|
|
|
|
/*
|
|
* gs_write
|
|
*/
|
|
static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
|
|
{
|
|
unsigned long flags;
|
|
struct gs_port *port = tty->driver_data;
|
|
int ret;
|
|
|
|
if (port == NULL) {
|
|
printk(KERN_ERR "gs_write: NULL port pointer\n");
|
|
return -EIO;
|
|
}
|
|
|
|
gs_debug("gs_write: (%d,%p) writing %d bytes\n", port->port_num, tty,
|
|
count);
|
|
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&port->port_lock, flags);
|
|
|
|
if (port->port_dev == NULL) {
|
|
printk(KERN_ERR "gs_write: (%d,%p) port is not connected\n",
|
|
port->port_num, tty);
|
|
ret = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
if (port->port_open_count == 0) {
|
|
printk(KERN_ERR "gs_write: (%d,%p) port is closed\n",
|
|
port->port_num, tty);
|
|
ret = -EBADF;
|
|
goto exit;
|
|
}
|
|
|
|
count = gs_buf_put(port->port_write_buf, buf, count);
|
|
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
|
|
gs_send(gs_device);
|
|
|
|
gs_debug("gs_write: (%d,%p) wrote %d bytes\n", port->port_num, tty,
|
|
count);
|
|
|
|
return count;
|
|
|
|
exit:
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* gs_put_char
|
|
*/
|
|
static void gs_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
unsigned long flags;
|
|
struct gs_port *port = tty->driver_data;
|
|
|
|
if (port == NULL) {
|
|
printk(KERN_ERR "gs_put_char: NULL port pointer\n");
|
|
return;
|
|
}
|
|
|
|
gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p, %p, %p\n", port->port_num, tty, ch, __builtin_return_address(0), __builtin_return_address(1), __builtin_return_address(2));
|
|
|
|
spin_lock_irqsave(&port->port_lock, flags);
|
|
|
|
if (port->port_dev == NULL) {
|
|
printk(KERN_ERR "gs_put_char: (%d,%p) port is not connected\n",
|
|
port->port_num, tty);
|
|
goto exit;
|
|
}
|
|
|
|
if (port->port_open_count == 0) {
|
|
printk(KERN_ERR "gs_put_char: (%d,%p) port is closed\n",
|
|
port->port_num, tty);
|
|
goto exit;
|
|
}
|
|
|
|
gs_buf_put(port->port_write_buf, &ch, 1);
|
|
|
|
exit:
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* gs_flush_chars
|
|
*/
|
|
static void gs_flush_chars(struct tty_struct *tty)
|
|
{
|
|
unsigned long flags;
|
|
struct gs_port *port = tty->driver_data;
|
|
|
|
if (port == NULL) {
|
|
printk(KERN_ERR "gs_flush_chars: NULL port pointer\n");
|
|
return;
|
|
}
|
|
|
|
gs_debug("gs_flush_chars: (%d,%p)\n", port->port_num, tty);
|
|
|
|
spin_lock_irqsave(&port->port_lock, flags);
|
|
|
|
if (port->port_dev == NULL) {
|
|
printk(KERN_ERR
|
|
"gs_flush_chars: (%d,%p) port is not connected\n",
|
|
port->port_num, tty);
|
|
goto exit;
|
|
}
|
|
|
|
if (port->port_open_count == 0) {
|
|
printk(KERN_ERR "gs_flush_chars: (%d,%p) port is closed\n",
|
|
port->port_num, tty);
|
|
goto exit;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
|
|
gs_send(gs_device);
|
|
|
|
return;
|
|
|
|
exit:
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* gs_write_room
|
|
*/
|
|
static int gs_write_room(struct tty_struct *tty)
|
|
{
|
|
|
|
int room = 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)
|
|
room = gs_buf_space_avail(port->port_write_buf);
|
|
|
|
spin_unlock_irqrestore(&port->port_lock, flags);
|
|
|
|
gs_debug("gs_write_room: (%d,%p) room=%d\n",
|
|
port->port_num, tty, room);
|
|
|
|
return room;
|
|
}
|
|
|
|
/*
|
|
* gs_chars_in_buffer
|
|
*/
|
|
static int gs_chars_in_buffer(struct tty_struct *tty)
|
|
{
|
|
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) {
|
|
printk(KERN_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) {
|
|
printk(KERN_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))) {
|
|
printk(KERN_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) {
|
|
printk(KERN_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) {
|
|
printk(KERN_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) {
|
|
printk(KERN_ERR "gs_recv_packet: port=%d, port is closed\n",
|
|
port->port_num);
|
|
ret = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
|
|
tty = port->port_tty;
|
|
|
|
if (tty == NULL) {
|
|
printk(KERN_ERR "gs_recv_packet: port=%d, NULL tty pointer\n",
|
|
port->port_num);
|
|
ret = -EIO;
|
|
goto exit;
|
|
}
|
|
|
|
if (port->port_tty->magic != TTY_MAGIC) {
|
|
printk(KERN_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) {
|
|
printk(KERN_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))) {
|
|
printk(KERN_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 */
|
|
printk(KERN_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) {
|
|
printk(KERN_ERR "gs_write_complete: NULL device pointer\n");
|
|
return;
|
|
}
|
|
|
|
switch(req->status) {
|
|
case 0:
|
|
/* normal completion */
|
|
requeue:
|
|
if (gs_req == NULL) {
|
|
printk(KERN_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:
|
|
printk(KERN_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 {
|
|
printk(KERN_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) {
|
|
printk(KERN_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;
|
|
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
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;
|
|
#endif /* CONFIG_USB_GADGET_DUALSPEED */
|
|
|
|
usb_gadget_set_selfpowered(gadget);
|
|
|
|
if (gadget->is_otg) {
|
|
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 = kmalloc(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);
|
|
|
|
memset(dev, 0, sizeof(struct gs_dev));
|
|
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) {
|
|
printk(KERN_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;
|
|
|
|
printk(KERN_INFO "gs_bind: %s %s bound\n",
|
|
GS_LONG_NAME, GS_VERSION_STR);
|
|
|
|
return 0;
|
|
|
|
autoconf_fail:
|
|
printk(KERN_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);
|
|
kfree(dev);
|
|
set_gadget_data(gadget, NULL);
|
|
}
|
|
|
|
printk(KERN_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:
|
|
printk(KERN_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) {
|
|
printk(KERN_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;
|
|
|
|
#ifdef CONFIG_USB_GADGET_DUALSPEED
|
|
case USB_DT_DEVICE_QUALIFIER:
|
|
if (!gadget->is_dualspeed)
|
|
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)
|
|
break;
|
|
/* fall through */
|
|
#endif /* CONFIG_USB_GADGET_DUALSPEED */
|
|
case USB_DT_CONFIG:
|
|
ret = gs_build_config_buf(req->buf, gadget->speed,
|
|
wValue >> 8, wValue & 0xff,
|
|
gadget->is_otg);
|
|
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:
|
|
printk(KERN_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:
|
|
ret = min(wLength,
|
|
(u16)sizeof(struct usb_cdc_line_coding));
|
|
if (port) {
|
|
spin_lock(&port->port_lock);
|
|
memcpy(&port->port_line_coding, req->buf, ret);
|
|
spin_unlock(&port->port_lock);
|
|
}
|
|
ret = 0;
|
|
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:
|
|
ret = 0;
|
|
break;
|
|
|
|
default:
|
|
printk(KERN_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) {
|
|
printk(KERN_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)
|
|
printk(KERN_ERR "gs_disconnect: cannot re-allocate ports\n");
|
|
|
|
spin_unlock_irqrestore(&dev->dev_lock, flags);
|
|
|
|
printk(KERN_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) {
|
|
printk(KERN_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 = GS_SPEED_SELECT(
|
|
gadget->speed == USB_SPEED_HIGH,
|
|
&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 {
|
|
printk(KERN_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 = GS_SPEED_SELECT(
|
|
gadget->speed == USB_SPEED_HIGH,
|
|
&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 {
|
|
printk(KERN_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 = GS_SPEED_SELECT(
|
|
gadget->speed == USB_SPEED_HIGH,
|
|
&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 {
|
|
printk(KERN_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)) {
|
|
printk(KERN_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))) {
|
|
printk(KERN_ERR "gs_set_config: cannot queue read request, ret=%d\n",
|
|
ret);
|
|
}
|
|
} else {
|
|
printk(KERN_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 {
|
|
printk(KERN_ERR "gs_set_config: cannot allocate write requests\n");
|
|
ret = -ENOMEM;
|
|
goto exit_reset_config;
|
|
}
|
|
}
|
|
|
|
printk(KERN_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) {
|
|
printk(KERN_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, enum usb_device_speed speed,
|
|
u8 type, unsigned int index, int is_otg)
|
|
{
|
|
int len;
|
|
int high_speed;
|
|
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 */
|
|
high_speed = (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 = GS_SPEED_SELECT(high_speed,
|
|
gs_acm_highspeed_function,
|
|
gs_acm_fullspeed_function);
|
|
} else {
|
|
config_desc = &gs_bulk_config_desc;
|
|
function = GS_SPEED_SELECT(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) {
|
|
wake_up_interruptible(&port->port_tty->read_wait);
|
|
wake_up_interruptible(&port->port_tty->write_wait);
|
|
}
|
|
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;
|
|
}
|