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linux/drivers/usb/gadget/serial.c
Savin Zlobec 4208978ec4 USB: gadget: Hangup tty on g_serial disconnect 
On USB cable disconnect g_serial doesn't hangup the port tty,
which results in an endless read on the tty device. With the
following patch the read and select behave correctly when
the cable is unplugged.

Tested on at91rm9200

Signed-off-by: Savin Zlobec <savin@epiko.si>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-04-24 21:16:35 -07:00

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57 KiB
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/*
* g_serial.c -- USB gadget serial driver
*
* Copyright 2003 (C) Al Borchers (alborchers@steinerpoint.com)
*
* This code is based in part on the Gadget Zero driver, which
* is Copyright (C) 2003 by David Brownell, all rights reserved.
*
* This code also borrows from usbserial.c, which is
* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2000 Peter Berger (pberger@brimson.com)
* Copyright (C) 2000 Al Borchers (alborchers@steinerpoint.com)
*
* This software is distributed under the terms of the GNU General
* Public License ("GPL") as published by the Free Software Foundation,
* either version 2 of that License or (at your option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/usb/ch9.h>
#include <linux/usb/cdc.h>
#include <linux/usb/gadget.h>
#include "gadget_chips.h"
/* Defines */
#define GS_VERSION_STR "v2.2"
#define GS_VERSION_NUM 0x0202
#define GS_LONG_NAME "Gadget Serial"
#define GS_SHORT_NAME "g_serial"
#define GS_MAJOR 127
#define GS_MINOR_START 0
#define GS_NUM_PORTS 16
#define GS_NUM_CONFIGS 1
#define GS_NO_CONFIG_ID 0
#define GS_BULK_CONFIG_ID 1
#define GS_ACM_CONFIG_ID 2
#define GS_MAX_NUM_INTERFACES 2
#define GS_BULK_INTERFACE_ID 0
#define GS_CONTROL_INTERFACE_ID 0
#define GS_DATA_INTERFACE_ID 1
#define GS_MAX_DESC_LEN 256
#define GS_DEFAULT_READ_Q_SIZE 32
#define GS_DEFAULT_WRITE_Q_SIZE 32
#define GS_DEFAULT_WRITE_BUF_SIZE 8192
#define GS_TMP_BUF_SIZE 8192
#define GS_CLOSE_TIMEOUT 15
#define GS_DEFAULT_USE_ACM 0
#define GS_DEFAULT_DTE_RATE 9600
#define GS_DEFAULT_DATA_BITS 8
#define GS_DEFAULT_PARITY USB_CDC_NO_PARITY
#define GS_DEFAULT_CHAR_FORMAT USB_CDC_1_STOP_BITS
/* maxpacket and other transfer characteristics vary by speed. */
static inline struct usb_endpoint_descriptor *
choose_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
struct usb_endpoint_descriptor *fs)
{
if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
return hs;
return fs;
}
/* debug settings */
#ifdef DEBUG
static int debug = 1;
#else
#define debug 0
#endif
#define gs_debug(format, arg...) \
do { if (debug) pr_debug(format, ## arg); } while (0)
#define gs_debug_level(level, format, arg...) \
do { if (debug >= level) pr_debug(format, ## arg); } while (0)
/* Thanks to NetChip Technologies for donating this product ID.
*
* DO NOT REUSE THESE IDs with a protocol-incompatible driver!! Ever!!
* Instead: allocate your own, using normal USB-IF procedures.
*/
#define GS_VENDOR_ID 0x0525 /* NetChip */
#define GS_PRODUCT_ID 0xa4a6 /* Linux-USB Serial Gadget */
#define GS_CDC_PRODUCT_ID 0xa4a7 /* ... as CDC-ACM */
#define GS_LOG2_NOTIFY_INTERVAL 5 /* 1 << 5 == 32 msec */
#define GS_NOTIFY_MAXPACKET 8
/* Structures */
struct gs_dev;
/* circular buffer */
struct gs_buf {
unsigned int buf_size;
char *buf_buf;
char *buf_get;
char *buf_put;
};
/* list of requests */
struct gs_req_entry {
struct list_head re_entry;
struct usb_request *re_req;
};
/* the port structure holds info for each port, one for each minor number */
struct gs_port {
struct gs_dev *port_dev; /* pointer to device struct */
struct tty_struct *port_tty; /* pointer to tty struct */
spinlock_t port_lock;
int port_num;
int port_open_count;
int port_in_use; /* open/close in progress */
wait_queue_head_t port_write_wait;/* waiting to write */
struct gs_buf *port_write_buf;
struct usb_cdc_line_coding port_line_coding;
};
/* the device structure holds info for the USB device */
struct gs_dev {
struct usb_gadget *dev_gadget; /* gadget device pointer */
spinlock_t dev_lock; /* lock for set/reset config */
int dev_config; /* configuration number */
struct usb_ep *dev_notify_ep; /* address of notify endpoint */
struct usb_ep *dev_in_ep; /* address of in endpoint */
struct usb_ep *dev_out_ep; /* address of out endpoint */
struct usb_endpoint_descriptor /* descriptor of notify ep */
*dev_notify_ep_desc;
struct usb_endpoint_descriptor /* descriptor of in endpoint */
*dev_in_ep_desc;
struct usb_endpoint_descriptor /* descriptor of out endpoint */
*dev_out_ep_desc;
struct usb_request *dev_ctrl_req; /* control request */
struct list_head dev_req_list; /* list of write requests */
int dev_sched_port; /* round robin port scheduled */
struct gs_port *dev_port[GS_NUM_PORTS]; /* the ports */
};
/* Functions */
/* module */
static int __init gs_module_init(void);
static void __exit gs_module_exit(void);
/* tty driver */
static int gs_open(struct tty_struct *tty, struct file *file);
static void gs_close(struct tty_struct *tty, struct file *file);
static int gs_write(struct tty_struct *tty,
const unsigned char *buf, int count);
static void gs_put_char(struct tty_struct *tty, unsigned char ch);
static void gs_flush_chars(struct tty_struct *tty);
static int gs_write_room(struct tty_struct *tty);
static int gs_chars_in_buffer(struct tty_struct *tty);
static void gs_throttle(struct tty_struct * tty);
static void gs_unthrottle(struct tty_struct * tty);
static void gs_break(struct tty_struct *tty, int break_state);
static int gs_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
static void gs_set_termios(struct tty_struct *tty, struct ktermios *old);
static int gs_send(struct gs_dev *dev);
static int gs_send_packet(struct gs_dev *dev, char *packet,
unsigned int size);
static int gs_recv_packet(struct gs_dev *dev, char *packet,
unsigned int size);
static void gs_read_complete(struct usb_ep *ep, struct usb_request *req);
static void gs_write_complete(struct usb_ep *ep, struct usb_request *req);
/* gadget driver */
static int gs_bind(struct usb_gadget *gadget);
static void gs_unbind(struct usb_gadget *gadget);
static int gs_setup(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl);
static int gs_setup_standard(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl);
static int gs_setup_class(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl);
static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req);
static void gs_disconnect(struct usb_gadget *gadget);
static int gs_set_config(struct gs_dev *dev, unsigned config);
static void gs_reset_config(struct gs_dev *dev);
static int gs_build_config_buf(u8 *buf, struct usb_gadget *g,
u8 type, unsigned int index, int is_otg);
static struct usb_request *gs_alloc_req(struct usb_ep *ep, unsigned int len,
gfp_t kmalloc_flags);
static void gs_free_req(struct usb_ep *ep, struct usb_request *req);
static struct gs_req_entry *gs_alloc_req_entry(struct usb_ep *ep, unsigned len,
gfp_t kmalloc_flags);
static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req);
static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags);
static void gs_free_ports(struct gs_dev *dev);
/* circular buffer */
static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags);
static void gs_buf_free(struct gs_buf *gb);
static void gs_buf_clear(struct gs_buf *gb);
static unsigned int gs_buf_data_avail(struct gs_buf *gb);
static unsigned int gs_buf_space_avail(struct gs_buf *gb);
static unsigned int gs_buf_put(struct gs_buf *gb, const char *buf,
unsigned int count);
static unsigned int gs_buf_get(struct gs_buf *gb, char *buf,
unsigned int count);
/* external functions */
extern int net2280_set_fifo_mode(struct usb_gadget *gadget, int mode);
/* Globals */
static struct gs_dev *gs_device;
static const char *EP_IN_NAME;
static const char *EP_OUT_NAME;
static const char *EP_NOTIFY_NAME;
static struct mutex gs_open_close_lock[GS_NUM_PORTS];
static unsigned int read_q_size = GS_DEFAULT_READ_Q_SIZE;
static unsigned int write_q_size = GS_DEFAULT_WRITE_Q_SIZE;
static unsigned int write_buf_size = GS_DEFAULT_WRITE_BUF_SIZE;
static unsigned int use_acm = GS_DEFAULT_USE_ACM;
/* tty driver struct */
static const struct tty_operations gs_tty_ops = {
.open = gs_open,
.close = gs_close,
.write = gs_write,
.put_char = gs_put_char,
.flush_chars = gs_flush_chars,
.write_room = gs_write_room,
.ioctl = gs_ioctl,
.set_termios = gs_set_termios,
.throttle = gs_throttle,
.unthrottle = gs_unthrottle,
.break_ctl = gs_break,
.chars_in_buffer = gs_chars_in_buffer,
};
static struct tty_driver *gs_tty_driver;
/* gadget driver struct */
static struct usb_gadget_driver gs_gadget_driver = {
#ifdef CONFIG_USB_GADGET_DUALSPEED
.speed = USB_SPEED_HIGH,
#else
.speed = USB_SPEED_FULL,
#endif /* CONFIG_USB_GADGET_DUALSPEED */
.function = GS_LONG_NAME,
.bind = gs_bind,
.unbind = gs_unbind,
.setup = gs_setup,
.disconnect = gs_disconnect,
.driver = {
.name = GS_SHORT_NAME,
},
};
/* USB descriptors */
#define GS_MANUFACTURER_STR_ID 1
#define GS_PRODUCT_STR_ID 2
#define GS_SERIAL_STR_ID 3
#define GS_BULK_CONFIG_STR_ID 4
#define GS_ACM_CONFIG_STR_ID 5
#define GS_CONTROL_STR_ID 6
#define GS_DATA_STR_ID 7
/* static strings, in UTF-8 */
static char manufacturer[50];
static struct usb_string gs_strings[] = {
{ GS_MANUFACTURER_STR_ID, manufacturer },
{ GS_PRODUCT_STR_ID, GS_LONG_NAME },
{ GS_SERIAL_STR_ID, "0" },
{ GS_BULK_CONFIG_STR_ID, "Gadget Serial Bulk" },
{ GS_ACM_CONFIG_STR_ID, "Gadget Serial CDC ACM" },
{ GS_CONTROL_STR_ID, "Gadget Serial Control" },
{ GS_DATA_STR_ID, "Gadget Serial Data" },
{ } /* end of list */
};
static struct usb_gadget_strings gs_string_table = {
.language = 0x0409, /* en-us */
.strings = gs_strings,
};
static struct usb_device_descriptor gs_device_desc = {
.bLength = USB_DT_DEVICE_SIZE,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = __constant_cpu_to_le16(0x0200),
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.idVendor = __constant_cpu_to_le16(GS_VENDOR_ID),
.idProduct = __constant_cpu_to_le16(GS_PRODUCT_ID),
.iManufacturer = GS_MANUFACTURER_STR_ID,
.iProduct = GS_PRODUCT_STR_ID,
.iSerialNumber = GS_SERIAL_STR_ID,
.bNumConfigurations = GS_NUM_CONFIGS,
};
static struct usb_otg_descriptor gs_otg_descriptor = {
.bLength = sizeof(gs_otg_descriptor),
.bDescriptorType = USB_DT_OTG,
.bmAttributes = USB_OTG_SRP,
};
static struct usb_config_descriptor gs_bulk_config_desc = {
.bLength = USB_DT_CONFIG_SIZE,
.bDescriptorType = USB_DT_CONFIG,
/* .wTotalLength computed dynamically */
.bNumInterfaces = 1,
.bConfigurationValue = GS_BULK_CONFIG_ID,
.iConfiguration = GS_BULK_CONFIG_STR_ID,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
.bMaxPower = 1,
};
static struct usb_config_descriptor gs_acm_config_desc = {
.bLength = USB_DT_CONFIG_SIZE,
.bDescriptorType = USB_DT_CONFIG,
/* .wTotalLength computed dynamically */
.bNumInterfaces = 2,
.bConfigurationValue = GS_ACM_CONFIG_ID,
.iConfiguration = GS_ACM_CONFIG_STR_ID,
.bmAttributes = USB_CONFIG_ATT_ONE | USB_CONFIG_ATT_SELFPOWER,
.bMaxPower = 1,
};
static const struct usb_interface_descriptor gs_bulk_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = GS_BULK_INTERFACE_ID,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = GS_DATA_STR_ID,
};
static const struct usb_interface_descriptor gs_control_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = GS_CONTROL_INTERFACE_ID,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
.bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
.iInterface = GS_CONTROL_STR_ID,
};
static const struct usb_interface_descriptor gs_data_interface_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = GS_DATA_INTERFACE_ID,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_CDC_DATA,
.bInterfaceSubClass = 0,
.bInterfaceProtocol = 0,
.iInterface = GS_DATA_STR_ID,
};
static const struct usb_cdc_header_desc gs_header_desc = {
.bLength = sizeof(gs_header_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_HEADER_TYPE,
.bcdCDC = __constant_cpu_to_le16(0x0110),
};
static const struct usb_cdc_call_mgmt_descriptor gs_call_mgmt_descriptor = {
.bLength = sizeof(gs_call_mgmt_descriptor),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
.bmCapabilities = 0,
.bDataInterface = 1, /* index of data interface */
};
static struct usb_cdc_acm_descriptor gs_acm_descriptor = {
.bLength = sizeof(gs_acm_descriptor),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_ACM_TYPE,
.bmCapabilities = 0,
};
static const struct usb_cdc_union_desc gs_union_desc = {
.bLength = sizeof(gs_union_desc),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubType = USB_CDC_UNION_TYPE,
.bMasterInterface0 = 0, /* index of control interface */
.bSlaveInterface0 = 1, /* index of data interface */
};
static struct usb_endpoint_descriptor gs_fullspeed_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 = 1 << GS_LOG2_NOTIFY_INTERVAL,
};
static struct usb_endpoint_descriptor gs_fullspeed_in_desc = {
.bLength = USB_DT_ENDPOINT_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
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,
};
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,
};
/* Module */
MODULE_DESCRIPTION(GS_LONG_NAME);
MODULE_AUTHOR("Al Borchers");
MODULE_LICENSE("GPL");
#ifdef 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) {
pr_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++)
mutex_init(&gs_open_close_lock[i]);
retval = tty_register_driver(gs_tty_driver);
if (retval) {
usb_gadget_unregister_driver(&gs_gadget_driver);
put_tty_driver(gs_tty_driver);
pr_err("gs_module_init: cannot register tty driver, "
"ret=%d\n", retval);
return retval;
}
pr_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);
pr_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 mutex *mtx;
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) {
pr_err("gs_open: (%d,%p,%p) invalid port number\n",
port_num, tty, file);
return -ENODEV;
}
dev = gs_device;
if (dev == NULL) {
pr_err("gs_open: (%d,%p,%p) NULL device pointer\n",
port_num, tty, file);
return -ENODEV;
}
mtx = &gs_open_close_lock[port_num];
if (mutex_lock_interruptible(mtx)) {
pr_err("gs_open: (%d,%p,%p) interrupted waiting for mutex\n",
port_num, tty, file);
return -ERESTARTSYS;
}
spin_lock_irqsave(&dev->dev_lock, flags);
if (dev->dev_config == GS_NO_CONFIG_ID) {
pr_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) {
pr_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) {
pr_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) {
pr_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) {
pr_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) {
pr_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);
mutex_unlock(mtx);
return ret;
exit_unlock_dev:
spin_unlock_irqrestore(&dev->dev_lock, flags);
mutex_unlock(mtx);
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 mutex *mtx;
if (port == NULL) {
pr_err("gs_close: NULL port pointer\n");
return;
}
gs_debug("gs_close: (%d,%p,%p)\n", port->port_num, tty, file);
mtx = &gs_open_close_lock[port->port_num];
mutex_lock(mtx);
spin_lock_irq(&port->port_lock);
if (port->port_open_count == 0) {
pr_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);
mutex_unlock(mtx);
}
/*
* 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) {
pr_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) {
pr_err("gs_write: (%d,%p) port is not connected\n",
port->port_num, tty);
ret = -EIO;
goto exit;
}
if (port->port_open_count == 0) {
pr_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) {
pr_err("gs_put_char: NULL port pointer\n");
return;
}
gs_debug("gs_put_char: (%d,%p) char=0x%x, called from %p\n",
port->port_num, tty, ch, __builtin_return_address(0));
spin_lock_irqsave(&port->port_lock, flags);
if (port->port_dev == NULL) {
pr_err("gs_put_char: (%d,%p) port is not connected\n",
port->port_num, tty);
goto exit;
}
if (port->port_open_count == 0) {
pr_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) {
pr_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) {
pr_err("gs_flush_chars: (%d,%p) port is not connected\n",
port->port_num, tty);
goto exit;
}
if (port->port_open_count == 0) {
pr_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) {
pr_err("gs_ioctl: NULL port pointer\n");
return -EIO;
}
gs_debug("gs_ioctl: (%d,%p,%p) cmd=0x%4.4x, arg=%lu\n",
port->port_num, tty, file, cmd, arg);
/* handle ioctls */
/* could not handle ioctl */
return -ENOIOCTLCMD;
}
/*
* gs_set_termios
*/
static void gs_set_termios(struct tty_struct *tty, struct ktermios *old)
{
}
/*
* gs_send
*
* This function finds available write requests, calls
* gs_send_packet to fill these packets with data, and
* continues until either there are no more write requests
* available or no more data to send. This function is
* run whenever data arrives or write requests are available.
*/
static int gs_send(struct gs_dev *dev)
{
int ret,len;
unsigned long flags;
struct usb_ep *ep;
struct usb_request *req;
struct gs_req_entry *req_entry;
if (dev == NULL) {
pr_err("gs_send: NULL device pointer\n");
return -ENODEV;
}
spin_lock_irqsave(&dev->dev_lock, flags);
ep = dev->dev_in_ep;
while(!list_empty(&dev->dev_req_list)) {
req_entry = list_entry(dev->dev_req_list.next,
struct gs_req_entry, re_entry);
req = req_entry->re_req;
len = gs_send_packet(dev, req->buf, ep->maxpacket);
if (len > 0) {
gs_debug_level(3, "gs_send: len=%d, 0x%2.2x "
"0x%2.2x 0x%2.2x ...\n", len,
*((unsigned char *)req->buf),
*((unsigned char *)req->buf+1),
*((unsigned char *)req->buf+2));
list_del(&req_entry->re_entry);
req->length = len;
spin_unlock_irqrestore(&dev->dev_lock, flags);
if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
pr_err(
"gs_send: cannot queue read request, ret=%d\n",
ret);
spin_lock_irqsave(&dev->dev_lock, flags);
break;
}
spin_lock_irqsave(&dev->dev_lock, flags);
} else {
break;
}
}
spin_unlock_irqrestore(&dev->dev_lock, flags);
return 0;
}
/*
* gs_send_packet
*
* If there is data to send, a packet is built in the given
* buffer and the size is returned. If there is no data to
* send, 0 is returned. If there is any error a negative
* error number is returned.
*
* Called during USB completion routine, on interrupt time.
*
* We assume that disconnect will not happen until all completion
* routines have completed, so we can assume that the dev_port
* array does not change during the lifetime of this function.
*/
static int gs_send_packet(struct gs_dev *dev, char *packet, unsigned int size)
{
unsigned int len;
struct gs_port *port;
/* TEMPORARY -- only port 0 is supported right now */
port = dev->dev_port[0];
if (port == NULL) {
pr_err("gs_send_packet: port=%d, NULL port pointer\n", 0);
return -EIO;
}
spin_lock(&port->port_lock);
len = gs_buf_data_avail(port->port_write_buf);
if (len < size)
size = len;
if (size == 0)
goto exit;
size = gs_buf_get(port->port_write_buf, packet, size);
if (port->port_tty)
wake_up_interruptible(&port->port_tty->write_wait);
exit:
spin_unlock(&port->port_lock);
return size;
}
/*
* gs_recv_packet
*
* Called for each USB packet received. Reads the packet
* header and stuffs the data in the appropriate tty buffer.
* Returns 0 if successful, or a negative error number.
*
* Called during USB completion routine, on interrupt time.
*
* We assume that disconnect will not happen until all completion
* routines have completed, so we can assume that the dev_port
* array does not change during the lifetime of this function.
*/
static int gs_recv_packet(struct gs_dev *dev, char *packet, unsigned int size)
{
unsigned int len;
struct gs_port *port;
int ret;
struct tty_struct *tty;
/* TEMPORARY -- only port 0 is supported right now */
port = dev->dev_port[0];
if (port == NULL) {
pr_err("gs_recv_packet: port=%d, NULL port pointer\n",
port->port_num);
return -EIO;
}
spin_lock(&port->port_lock);
if (port->port_open_count == 0) {
pr_err("gs_recv_packet: port=%d, port is closed\n",
port->port_num);
ret = -EIO;
goto exit;
}
tty = port->port_tty;
if (tty == NULL) {
pr_err("gs_recv_packet: port=%d, NULL tty pointer\n",
port->port_num);
ret = -EIO;
goto exit;
}
if (port->port_tty->magic != TTY_MAGIC) {
pr_err("gs_recv_packet: port=%d, bad tty magic\n",
port->port_num);
ret = -EIO;
goto exit;
}
len = tty_buffer_request_room(tty, size);
if (len > 0) {
tty_insert_flip_string(tty, packet, len);
tty_flip_buffer_push(port->port_tty);
wake_up_interruptible(&port->port_tty->read_wait);
}
ret = 0;
exit:
spin_unlock(&port->port_lock);
return ret;
}
/*
* gs_read_complete
*/
static void gs_read_complete(struct usb_ep *ep, struct usb_request *req)
{
int ret;
struct gs_dev *dev = ep->driver_data;
if (dev == NULL) {
pr_err("gs_read_complete: NULL device pointer\n");
return;
}
switch(req->status) {
case 0:
/* normal completion */
gs_recv_packet(dev, req->buf, req->actual);
requeue:
req->length = ep->maxpacket;
if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
pr_err(
"gs_read_complete: cannot queue read request, ret=%d\n",
ret);
}
break;
case -ESHUTDOWN:
/* disconnect */
gs_debug("gs_read_complete: shutdown\n");
gs_free_req(ep, req);
break;
default:
/* unexpected */
pr_err(
"gs_read_complete: unexpected status error, status=%d\n",
req->status);
goto requeue;
break;
}
}
/*
* gs_write_complete
*/
static void gs_write_complete(struct usb_ep *ep, struct usb_request *req)
{
struct gs_dev *dev = ep->driver_data;
struct gs_req_entry *gs_req = req->context;
if (dev == NULL) {
pr_err("gs_write_complete: NULL device pointer\n");
return;
}
switch(req->status) {
case 0:
/* normal completion */
requeue:
if (gs_req == NULL) {
pr_err("gs_write_complete: NULL request pointer\n");
return;
}
spin_lock(&dev->dev_lock);
list_add(&gs_req->re_entry, &dev->dev_req_list);
spin_unlock(&dev->dev_lock);
gs_send(dev);
break;
case -ESHUTDOWN:
/* disconnect */
gs_debug("gs_write_complete: shutdown\n");
gs_free_req(ep, req);
break;
default:
pr_err(
"gs_write_complete: unexpected status error, status=%d\n",
req->status);
goto requeue;
break;
}
}
/* Gadget Driver */
/*
* gs_bind
*
* Called on module load. Allocates and initializes the device
* structure and a control request.
*/
static int __init gs_bind(struct usb_gadget *gadget)
{
int ret;
struct usb_ep *ep;
struct gs_dev *dev;
int gcnum;
/* Some controllers can't support CDC ACM:
* - sh doesn't support multiple interfaces or configs;
* - sa1100 doesn't have a third interrupt endpoint
*/
if (gadget_is_sh(gadget) || gadget_is_sa1100(gadget))
use_acm = 0;
gcnum = usb_gadget_controller_number(gadget);
if (gcnum >= 0)
gs_device_desc.bcdDevice =
cpu_to_le16(GS_VERSION_NUM | gcnum);
else {
pr_warning("gs_bind: controller '%s' not recognized\n",
gadget->name);
/* unrecognized, but safe unless bulk is REALLY quirky */
gs_device_desc.bcdDevice =
__constant_cpu_to_le16(GS_VERSION_NUM|0x0099);
}
usb_ep_autoconfig_reset(gadget);
ep = usb_ep_autoconfig(gadget, &gs_fullspeed_in_desc);
if (!ep)
goto autoconf_fail;
EP_IN_NAME = ep->name;
ep->driver_data = ep; /* claim the endpoint */
ep = usb_ep_autoconfig(gadget, &gs_fullspeed_out_desc);
if (!ep)
goto autoconf_fail;
EP_OUT_NAME = ep->name;
ep->driver_data = ep; /* claim the endpoint */
if (use_acm) {
ep = usb_ep_autoconfig(gadget, &gs_fullspeed_notify_desc);
if (!ep) {
pr_err("gs_bind: cannot run ACM on %s\n", gadget->name);
goto autoconf_fail;
}
gs_device_desc.idProduct = __constant_cpu_to_le16(
GS_CDC_PRODUCT_ID),
EP_NOTIFY_NAME = ep->name;
ep->driver_data = ep; /* claim the endpoint */
}
gs_device_desc.bDeviceClass = use_acm
? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
gs_device_desc.bMaxPacketSize0 = gadget->ep0->maxpacket;
if (gadget_is_dualspeed(gadget)) {
gs_qualifier_desc.bDeviceClass = use_acm
? USB_CLASS_COMM : USB_CLASS_VENDOR_SPEC;
/* assume ep0 uses the same packet size for both speeds */
gs_qualifier_desc.bMaxPacketSize0 =
gs_device_desc.bMaxPacketSize0;
/* assume endpoints are dual-speed */
gs_highspeed_notify_desc.bEndpointAddress =
gs_fullspeed_notify_desc.bEndpointAddress;
gs_highspeed_in_desc.bEndpointAddress =
gs_fullspeed_in_desc.bEndpointAddress;
gs_highspeed_out_desc.bEndpointAddress =
gs_fullspeed_out_desc.bEndpointAddress;
}
usb_gadget_set_selfpowered(gadget);
if (gadget_is_otg(gadget)) {
gs_otg_descriptor.bmAttributes |= USB_OTG_HNP,
gs_bulk_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
gs_acm_config_desc.bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
gs_device = dev = kzalloc(sizeof(struct gs_dev), GFP_KERNEL);
if (dev == NULL)
return -ENOMEM;
snprintf(manufacturer, sizeof(manufacturer), "%s %s with %s",
init_utsname()->sysname, init_utsname()->release,
gadget->name);
dev->dev_gadget = gadget;
spin_lock_init(&dev->dev_lock);
INIT_LIST_HEAD(&dev->dev_req_list);
set_gadget_data(gadget, dev);
if ((ret=gs_alloc_ports(dev, GFP_KERNEL)) != 0) {
pr_err("gs_bind: cannot allocate ports\n");
gs_unbind(gadget);
return ret;
}
/* preallocate control response and buffer */
dev->dev_ctrl_req = gs_alloc_req(gadget->ep0, GS_MAX_DESC_LEN,
GFP_KERNEL);
if (dev->dev_ctrl_req == NULL) {
gs_unbind(gadget);
return -ENOMEM;
}
dev->dev_ctrl_req->complete = gs_setup_complete;
gadget->ep0->driver_data = dev;
pr_info("gs_bind: %s %s bound\n",
GS_LONG_NAME, GS_VERSION_STR);
return 0;
autoconf_fail:
pr_err("gs_bind: cannot autoconfigure on %s\n", gadget->name);
return -ENODEV;
}
/*
* gs_unbind
*
* Called on module unload. Frees the control request and device
* structure.
*/
static void /* __init_or_exit */ gs_unbind(struct usb_gadget *gadget)
{
struct gs_dev *dev = get_gadget_data(gadget);
gs_device = NULL;
/* read/write requests already freed, only control request remains */
if (dev != NULL) {
if (dev->dev_ctrl_req != NULL) {
gs_free_req(gadget->ep0, dev->dev_ctrl_req);
dev->dev_ctrl_req = NULL;
}
gs_free_ports(dev);
if (dev->dev_notify_ep)
usb_ep_disable(dev->dev_notify_ep);
if (dev->dev_in_ep)
usb_ep_disable(dev->dev_in_ep);
if (dev->dev_out_ep)
usb_ep_disable(dev->dev_out_ep);
kfree(dev);
set_gadget_data(gadget, NULL);
}
pr_info("gs_unbind: %s %s unbound\n", GS_LONG_NAME,
GS_VERSION_STR);
}
/*
* gs_setup
*
* Implements all the control endpoint functionality that's not
* handled in hardware or the hardware driver.
*
* Returns the size of the data sent to the host, or a negative
* error number.
*/
static int gs_setup(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl)
{
int ret = -EOPNOTSUPP;
struct gs_dev *dev = get_gadget_data(gadget);
struct usb_request *req = dev->dev_ctrl_req;
u16 wIndex = le16_to_cpu(ctrl->wIndex);
u16 wValue = le16_to_cpu(ctrl->wValue);
u16 wLength = le16_to_cpu(ctrl->wLength);
switch (ctrl->bRequestType & USB_TYPE_MASK) {
case USB_TYPE_STANDARD:
ret = gs_setup_standard(gadget,ctrl);
break;
case USB_TYPE_CLASS:
ret = gs_setup_class(gadget,ctrl);
break;
default:
pr_err("gs_setup: unknown request, type=%02x, request=%02x, "
"value=%04x, index=%04x, length=%d\n",
ctrl->bRequestType, ctrl->bRequest,
wValue, wIndex, wLength);
break;
}
/* respond with data transfer before status phase? */
if (ret >= 0) {
req->length = ret;
req->zero = ret < wLength
&& (ret % gadget->ep0->maxpacket) == 0;
ret = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
if (ret < 0) {
pr_err("gs_setup: cannot queue response, ret=%d\n",
ret);
req->status = 0;
gs_setup_complete(gadget->ep0, req);
}
}
/* device either stalls (ret < 0) or reports success */
return ret;
}
static int gs_setup_standard(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl)
{
int ret = -EOPNOTSUPP;
struct gs_dev *dev = get_gadget_data(gadget);
struct usb_request *req = dev->dev_ctrl_req;
u16 wIndex = le16_to_cpu(ctrl->wIndex);
u16 wValue = le16_to_cpu(ctrl->wValue);
u16 wLength = le16_to_cpu(ctrl->wLength);
switch (ctrl->bRequest) {
case USB_REQ_GET_DESCRIPTOR:
if (ctrl->bRequestType != USB_DIR_IN)
break;
switch (wValue >> 8) {
case USB_DT_DEVICE:
ret = min(wLength,
(u16)sizeof(struct usb_device_descriptor));
memcpy(req->buf, &gs_device_desc, ret);
break;
case USB_DT_DEVICE_QUALIFIER:
if (!gadget_is_dualspeed(gadget))
break;
ret = min(wLength,
(u16)sizeof(struct usb_qualifier_descriptor));
memcpy(req->buf, &gs_qualifier_desc, ret);
break;
case USB_DT_OTHER_SPEED_CONFIG:
if (!gadget_is_dualspeed(gadget))
break;
/* fall through */
case USB_DT_CONFIG:
ret = gs_build_config_buf(req->buf, gadget,
wValue >> 8, wValue & 0xff,
gadget_is_otg(gadget));
if (ret >= 0)
ret = min(wLength, (u16)ret);
break;
case USB_DT_STRING:
/* wIndex == language code. */
ret = usb_gadget_get_string(&gs_string_table,
wValue & 0xff, req->buf);
if (ret >= 0)
ret = min(wLength, (u16)ret);
break;
}
break;
case USB_REQ_SET_CONFIGURATION:
if (ctrl->bRequestType != 0)
break;
spin_lock(&dev->dev_lock);
ret = gs_set_config(dev, wValue);
spin_unlock(&dev->dev_lock);
break;
case USB_REQ_GET_CONFIGURATION:
if (ctrl->bRequestType != USB_DIR_IN)
break;
*(u8 *)req->buf = dev->dev_config;
ret = min(wLength, (u16)1);
break;
case USB_REQ_SET_INTERFACE:
if (ctrl->bRequestType != USB_RECIP_INTERFACE
|| !dev->dev_config
|| wIndex >= GS_MAX_NUM_INTERFACES)
break;
if (dev->dev_config == GS_BULK_CONFIG_ID
&& wIndex != GS_BULK_INTERFACE_ID)
break;
/* no alternate interface settings */
if (wValue != 0)
break;
spin_lock(&dev->dev_lock);
/* PXA hardware partially handles SET_INTERFACE;
* we need to kluge around that interference. */
if (gadget_is_pxa(gadget)) {
ret = gs_set_config(dev, use_acm ?
GS_ACM_CONFIG_ID : GS_BULK_CONFIG_ID);
goto set_interface_done;
}
if (dev->dev_config != GS_BULK_CONFIG_ID
&& wIndex == GS_CONTROL_INTERFACE_ID) {
if (dev->dev_notify_ep) {
usb_ep_disable(dev->dev_notify_ep);
usb_ep_enable(dev->dev_notify_ep, dev->dev_notify_ep_desc);
}
} else {
usb_ep_disable(dev->dev_in_ep);
usb_ep_disable(dev->dev_out_ep);
usb_ep_enable(dev->dev_in_ep, dev->dev_in_ep_desc);
usb_ep_enable(dev->dev_out_ep, dev->dev_out_ep_desc);
}
ret = 0;
set_interface_done:
spin_unlock(&dev->dev_lock);
break;
case USB_REQ_GET_INTERFACE:
if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)
|| dev->dev_config == GS_NO_CONFIG_ID)
break;
if (wIndex >= GS_MAX_NUM_INTERFACES
|| (dev->dev_config == GS_BULK_CONFIG_ID
&& wIndex != GS_BULK_INTERFACE_ID)) {
ret = -EDOM;
break;
}
/* no alternate interface settings */
*(u8 *)req->buf = 0;
ret = min(wLength, (u16)1);
break;
default:
pr_err("gs_setup: unknown standard request, type=%02x, "
"request=%02x, value=%04x, index=%04x, length=%d\n",
ctrl->bRequestType, ctrl->bRequest,
wValue, wIndex, wLength);
break;
}
return ret;
}
static int gs_setup_class(struct usb_gadget *gadget,
const struct usb_ctrlrequest *ctrl)
{
int ret = -EOPNOTSUPP;
struct gs_dev *dev = get_gadget_data(gadget);
struct gs_port *port = dev->dev_port[0]; /* ACM only has one port */
struct usb_request *req = dev->dev_ctrl_req;
u16 wIndex = le16_to_cpu(ctrl->wIndex);
u16 wValue = le16_to_cpu(ctrl->wValue);
u16 wLength = le16_to_cpu(ctrl->wLength);
switch (ctrl->bRequest) {
case USB_CDC_REQ_SET_LINE_CODING:
/* FIXME Submit req to read the data; have its completion
* handler copy that data to port->port_line_coding (iff
* it's valid) and maybe pass it on. Until then, fail.
*/
pr_warning("gs_setup: set_line_coding "
"unuspported\n");
break;
case USB_CDC_REQ_GET_LINE_CODING:
port = dev->dev_port[0]; /* ACM only has one port */
ret = min(wLength,
(u16)sizeof(struct usb_cdc_line_coding));
if (port) {
spin_lock(&port->port_lock);
memcpy(req->buf, &port->port_line_coding, ret);
spin_unlock(&port->port_lock);
}
break;
case USB_CDC_REQ_SET_CONTROL_LINE_STATE:
/* FIXME Submit req to read the data; have its completion
* handler use that to set the state (iff it's valid) and
* maybe pass it on. Until then, fail.
*/
pr_warning("gs_setup: set_control_line_state "
"unuspported\n");
break;
default:
pr_err("gs_setup: unknown class request, "
"type=%02x, request=%02x, value=%04x, "
"index=%04x, length=%d\n",
ctrl->bRequestType, ctrl->bRequest,
wValue, wIndex, wLength);
break;
}
return ret;
}
/*
* gs_setup_complete
*/
static void gs_setup_complete(struct usb_ep *ep, struct usb_request *req)
{
if (req->status || req->actual != req->length) {
pr_err("gs_setup_complete: status error, status=%d, "
"actual=%d, length=%d\n",
req->status, req->actual, req->length);
}
}
/*
* gs_disconnect
*
* Called when the device is disconnected. Frees the closed
* ports and disconnects open ports. Open ports will be freed
* on close. Then reallocates the ports for the next connection.
*/
static void gs_disconnect(struct usb_gadget *gadget)
{
unsigned long flags;
struct gs_dev *dev = get_gadget_data(gadget);
spin_lock_irqsave(&dev->dev_lock, flags);
gs_reset_config(dev);
/* free closed ports and disconnect open ports */
/* (open ports will be freed when closed) */
gs_free_ports(dev);
/* re-allocate ports for the next connection */
if (gs_alloc_ports(dev, GFP_ATOMIC) != 0)
pr_err("gs_disconnect: cannot re-allocate ports\n");
spin_unlock_irqrestore(&dev->dev_lock, flags);
pr_info("gs_disconnect: %s disconnected\n", GS_LONG_NAME);
}
/*
* gs_set_config
*
* Configures the device by enabling device specific
* optimizations, setting up the endpoints, allocating
* read and write requests and queuing read requests.
*
* The device lock must be held when calling this function.
*/
static int gs_set_config(struct gs_dev *dev, unsigned config)
{
int i;
int ret = 0;
struct usb_gadget *gadget = dev->dev_gadget;
struct usb_ep *ep;
struct usb_endpoint_descriptor *ep_desc;
struct usb_request *req;
struct gs_req_entry *req_entry;
if (dev == NULL) {
pr_err("gs_set_config: NULL device pointer\n");
return 0;
}
if (config == dev->dev_config)
return 0;
gs_reset_config(dev);
switch (config) {
case GS_NO_CONFIG_ID:
return 0;
case GS_BULK_CONFIG_ID:
if (use_acm)
return -EINVAL;
/* device specific optimizations */
if (gadget_is_net2280(gadget))
net2280_set_fifo_mode(gadget, 1);
break;
case GS_ACM_CONFIG_ID:
if (!use_acm)
return -EINVAL;
/* device specific optimizations */
if (gadget_is_net2280(gadget))
net2280_set_fifo_mode(gadget, 1);
break;
default:
return -EINVAL;
}
dev->dev_config = config;
gadget_for_each_ep(ep, gadget) {
if (EP_NOTIFY_NAME
&& strcmp(ep->name, EP_NOTIFY_NAME) == 0) {
ep_desc = choose_ep_desc(gadget,
&gs_highspeed_notify_desc,
&gs_fullspeed_notify_desc);
ret = usb_ep_enable(ep,ep_desc);
if (ret == 0) {
ep->driver_data = dev;
dev->dev_notify_ep = ep;
dev->dev_notify_ep_desc = ep_desc;
} else {
pr_err("gs_set_config: cannot enable NOTIFY "
"endpoint %s, ret=%d\n",
ep->name, ret);
goto exit_reset_config;
}
}
else if (strcmp(ep->name, EP_IN_NAME) == 0) {
ep_desc = choose_ep_desc(gadget,
&gs_highspeed_in_desc,
&gs_fullspeed_in_desc);
ret = usb_ep_enable(ep,ep_desc);
if (ret == 0) {
ep->driver_data = dev;
dev->dev_in_ep = ep;
dev->dev_in_ep_desc = ep_desc;
} else {
pr_err("gs_set_config: cannot enable IN "
"endpoint %s, ret=%d\n",
ep->name, ret);
goto exit_reset_config;
}
}
else if (strcmp(ep->name, EP_OUT_NAME) == 0) {
ep_desc = choose_ep_desc(gadget,
&gs_highspeed_out_desc,
&gs_fullspeed_out_desc);
ret = usb_ep_enable(ep,ep_desc);
if (ret == 0) {
ep->driver_data = dev;
dev->dev_out_ep = ep;
dev->dev_out_ep_desc = ep_desc;
} else {
pr_err("gs_set_config: cannot enable OUT "
"endpoint %s, ret=%d\n",
ep->name, ret);
goto exit_reset_config;
}
}
}
if (dev->dev_in_ep == NULL || dev->dev_out_ep == NULL
|| (config != GS_BULK_CONFIG_ID && dev->dev_notify_ep == NULL)) {
pr_err("gs_set_config: cannot find endpoints\n");
ret = -ENODEV;
goto exit_reset_config;
}
/* allocate and queue read requests */
ep = dev->dev_out_ep;
for (i=0; i<read_q_size && ret == 0; i++) {
if ((req=gs_alloc_req(ep, ep->maxpacket, GFP_ATOMIC))) {
req->complete = gs_read_complete;
if ((ret=usb_ep_queue(ep, req, GFP_ATOMIC))) {
pr_err("gs_set_config: cannot queue read "
"request, ret=%d\n", ret);
}
} else {
pr_err("gs_set_config: cannot allocate "
"read requests\n");
ret = -ENOMEM;
goto exit_reset_config;
}
}
/* allocate write requests, and put on free list */
ep = dev->dev_in_ep;
for (i=0; i<write_q_size; i++) {
if ((req_entry=gs_alloc_req_entry(ep, ep->maxpacket, GFP_ATOMIC))) {
req_entry->re_req->complete = gs_write_complete;
list_add(&req_entry->re_entry, &dev->dev_req_list);
} else {
pr_err("gs_set_config: cannot allocate "
"write requests\n");
ret = -ENOMEM;
goto exit_reset_config;
}
}
pr_info("gs_set_config: %s configured, %s speed %s config\n",
GS_LONG_NAME,
gadget->speed == USB_SPEED_HIGH ? "high" : "full",
config == GS_BULK_CONFIG_ID ? "BULK" : "CDC-ACM");
return 0;
exit_reset_config:
gs_reset_config(dev);
return ret;
}
/*
* gs_reset_config
*
* Mark the device as not configured, disable all endpoints,
* which forces completion of pending I/O and frees queued
* requests, and free the remaining write requests on the
* free list.
*
* The device lock must be held when calling this function.
*/
static void gs_reset_config(struct gs_dev *dev)
{
struct gs_req_entry *req_entry;
if (dev == NULL) {
pr_err("gs_reset_config: NULL device pointer\n");
return;
}
if (dev->dev_config == GS_NO_CONFIG_ID)
return;
dev->dev_config = GS_NO_CONFIG_ID;
/* free write requests on the free list */
while(!list_empty(&dev->dev_req_list)) {
req_entry = list_entry(dev->dev_req_list.next,
struct gs_req_entry, re_entry);
list_del(&req_entry->re_entry);
gs_free_req_entry(dev->dev_in_ep, req_entry);
}
/* disable endpoints, forcing completion of pending i/o; */
/* completion handlers free their requests in this case */
if (dev->dev_notify_ep) {
usb_ep_disable(dev->dev_notify_ep);
dev->dev_notify_ep = NULL;
}
if (dev->dev_in_ep) {
usb_ep_disable(dev->dev_in_ep);
dev->dev_in_ep = NULL;
}
if (dev->dev_out_ep) {
usb_ep_disable(dev->dev_out_ep);
dev->dev_out_ep = NULL;
}
}
/*
* gs_build_config_buf
*
* Builds the config descriptors in the given buffer and returns the
* length, or a negative error number.
*/
static int gs_build_config_buf(u8 *buf, struct usb_gadget *g,
u8 type, unsigned int index, int is_otg)
{
int len;
int high_speed = 0;
const struct usb_config_descriptor *config_desc;
const struct usb_descriptor_header **function;
if (index >= gs_device_desc.bNumConfigurations)
return -EINVAL;
/* other speed switches high and full speed */
if (gadget_is_dualspeed(g)) {
high_speed = (g->speed == USB_SPEED_HIGH);
if (type == USB_DT_OTHER_SPEED_CONFIG)
high_speed = !high_speed;
}
if (use_acm) {
config_desc = &gs_acm_config_desc;
function = high_speed
? gs_acm_highspeed_function
: gs_acm_fullspeed_function;
} else {
config_desc = &gs_bulk_config_desc;
function = high_speed
? gs_bulk_highspeed_function
: gs_bulk_fullspeed_function;
}
/* for now, don't advertise srp-only devices */
if (!is_otg)
function++;
len = usb_gadget_config_buf(config_desc, buf, GS_MAX_DESC_LEN, function);
if (len < 0)
return len;
((struct usb_config_descriptor *)buf)->bDescriptorType = type;
return len;
}
/*
* gs_alloc_req
*
* Allocate a usb_request and its buffer. Returns a pointer to the
* usb_request or NULL if there is an error.
*/
static struct usb_request *
gs_alloc_req(struct usb_ep *ep, unsigned int len, gfp_t kmalloc_flags)
{
struct usb_request *req;
if (ep == NULL)
return NULL;
req = usb_ep_alloc_request(ep, kmalloc_flags);
if (req != NULL) {
req->length = len;
req->buf = kmalloc(len, kmalloc_flags);
if (req->buf == NULL) {
usb_ep_free_request(ep, req);
return NULL;
}
}
return req;
}
/*
* gs_free_req
*
* Free a usb_request and its buffer.
*/
static void gs_free_req(struct usb_ep *ep, struct usb_request *req)
{
if (ep != NULL && req != NULL) {
kfree(req->buf);
usb_ep_free_request(ep, req);
}
}
/*
* gs_alloc_req_entry
*
* Allocates a request and its buffer, using the given
* endpoint, buffer len, and kmalloc flags.
*/
static struct gs_req_entry *
gs_alloc_req_entry(struct usb_ep *ep, unsigned len, gfp_t kmalloc_flags)
{
struct gs_req_entry *req;
req = kmalloc(sizeof(struct gs_req_entry), kmalloc_flags);
if (req == NULL)
return NULL;
req->re_req = gs_alloc_req(ep, len, kmalloc_flags);
if (req->re_req == NULL) {
kfree(req);
return NULL;
}
req->re_req->context = req;
return req;
}
/*
* gs_free_req_entry
*
* Frees a request and its buffer.
*/
static void gs_free_req_entry(struct usb_ep *ep, struct gs_req_entry *req)
{
if (ep != NULL && req != NULL) {
if (req->re_req != NULL)
gs_free_req(ep, req->re_req);
kfree(req);
}
}
/*
* gs_alloc_ports
*
* Allocate all ports and set the gs_dev struct to point to them.
* Return 0 if successful, or a negative error number.
*
* The device lock is normally held when calling this function.
*/
static int gs_alloc_ports(struct gs_dev *dev, gfp_t kmalloc_flags)
{
int i;
struct gs_port *port;
if (dev == NULL)
return -EIO;
for (i=0; i<GS_NUM_PORTS; i++) {
if ((port=kzalloc(sizeof(struct gs_port), kmalloc_flags)) == NULL)
return -ENOMEM;
port->port_dev = dev;
port->port_num = i;
port->port_line_coding.dwDTERate = cpu_to_le32(GS_DEFAULT_DTE_RATE);
port->port_line_coding.bCharFormat = GS_DEFAULT_CHAR_FORMAT;
port->port_line_coding.bParityType = GS_DEFAULT_PARITY;
port->port_line_coding.bDataBits = GS_DEFAULT_DATA_BITS;
spin_lock_init(&port->port_lock);
init_waitqueue_head(&port->port_write_wait);
dev->dev_port[i] = port;
}
return 0;
}
/*
* gs_free_ports
*
* Free all closed ports. Open ports are disconnected by
* freeing their write buffers, setting their device pointers
* and the pointers to them in the device to NULL. These
* ports will be freed when closed.
*
* The device lock is normally held when calling this function.
*/
static void gs_free_ports(struct gs_dev *dev)
{
int i;
unsigned long flags;
struct gs_port *port;
if (dev == NULL)
return;
for (i=0; i<GS_NUM_PORTS; i++) {
if ((port=dev->dev_port[i]) != NULL) {
dev->dev_port[i] = NULL;
spin_lock_irqsave(&port->port_lock, flags);
if (port->port_write_buf != NULL) {
gs_buf_free(port->port_write_buf);
port->port_write_buf = NULL;
}
if (port->port_open_count > 0 || port->port_in_use) {
port->port_dev = NULL;
wake_up_interruptible(&port->port_write_wait);
if (port->port_tty) {
tty_hangup(port->port_tty);
}
spin_unlock_irqrestore(&port->port_lock, flags);
} else {
spin_unlock_irqrestore(&port->port_lock, flags);
kfree(port);
}
}
}
}
/* Circular Buffer */
/*
* gs_buf_alloc
*
* Allocate a circular buffer and all associated memory.
*/
static struct gs_buf *gs_buf_alloc(unsigned int size, gfp_t kmalloc_flags)
{
struct gs_buf *gb;
if (size == 0)
return NULL;
gb = kmalloc(sizeof(struct gs_buf), kmalloc_flags);
if (gb == NULL)
return NULL;
gb->buf_buf = kmalloc(size, kmalloc_flags);
if (gb->buf_buf == NULL) {
kfree(gb);
return NULL;
}
gb->buf_size = size;
gb->buf_get = gb->buf_put = gb->buf_buf;
return gb;
}
/*
* gs_buf_free
*
* Free the buffer and all associated memory.
*/
static void gs_buf_free(struct gs_buf *gb)
{
if (gb) {
kfree(gb->buf_buf);
kfree(gb);
}
}
/*
* gs_buf_clear
*
* Clear out all data in the circular buffer.
*/
static void gs_buf_clear(struct gs_buf *gb)
{
if (gb != NULL)
gb->buf_get = gb->buf_put;
/* equivalent to a get of all data available */
}
/*
* gs_buf_data_avail
*
* Return the number of bytes of data available in the circular
* buffer.
*/
static unsigned int gs_buf_data_avail(struct gs_buf *gb)
{
if (gb != NULL)
return (gb->buf_size + gb->buf_put - gb->buf_get) % gb->buf_size;
else
return 0;
}
/*
* gs_buf_space_avail
*
* Return the number of bytes of space available in the circular
* buffer.
*/
static unsigned int gs_buf_space_avail(struct gs_buf *gb)
{
if (gb != NULL)
return (gb->buf_size + gb->buf_get - gb->buf_put - 1) % gb->buf_size;
else
return 0;
}
/*
* gs_buf_put
*
* Copy data data from a user buffer and put it into the circular buffer.
* Restrict to the amount of space available.
*
* Return the number of bytes copied.
*/
static unsigned int
gs_buf_put(struct gs_buf *gb, const char *buf, unsigned int count)
{
unsigned int len;
if (gb == NULL)
return 0;
len = gs_buf_space_avail(gb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = gb->buf_buf + gb->buf_size - gb->buf_put;
if (count > len) {
memcpy(gb->buf_put, buf, len);
memcpy(gb->buf_buf, buf+len, count - len);
gb->buf_put = gb->buf_buf + count - len;
} else {
memcpy(gb->buf_put, buf, count);
if (count < len)
gb->buf_put += count;
else /* count == len */
gb->buf_put = gb->buf_buf;
}
return count;
}
/*
* gs_buf_get
*
* Get data from the circular buffer and copy to the given buffer.
* Restrict to the amount of data available.
*
* Return the number of bytes copied.
*/
static unsigned int
gs_buf_get(struct gs_buf *gb, char *buf, unsigned int count)
{
unsigned int len;
if (gb == NULL)
return 0;
len = gs_buf_data_avail(gb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = gb->buf_buf + gb->buf_size - gb->buf_get;
if (count > len) {
memcpy(buf, gb->buf_get, len);
memcpy(buf+len, gb->buf_buf, count - len);
gb->buf_get = gb->buf_buf + count - len;
} else {
memcpy(buf, gb->buf_get, count);
if (count < len)
gb->buf_get += count;
else /* count == len */
gb->buf_get = gb->buf_buf;
}
return count;
}
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