include/linux/usb/serial.h

   1 /*
   2  * USB Serial Converter stuff
   3  *
   4  *      Copyright (C) 1999 - 2005
   5  *          Greg Kroah-Hartman (greg@kroah.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; version 2 of the License.
  10  *
  11  */
  12
  13 #ifndef __LINUX_USB_SERIAL_H
  14 #define __LINUX_USB_SERIAL_H
  15
  16 #include <linux/kref.h>
  17 #include <linux/mutex.h>
  18
  19 #define SERIAL_TTY_MAJOR        188     /* Nice legal number now */
  20 #define SERIAL_TTY_MINORS       254     /* loads of devices :) */
  21 #define SERIAL_TTY_NO_MINOR     255     /* No minor was assigned */
  22
  23 /* The maximum number of ports one device can grab at once */
  24 #define MAX_NUM_PORTS           8
  25
  26 /* parity check flag */
  27 #define RELEVANT_IFLAG(iflag)   (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
  28
  29 /**
  30  * usb_serial_port: structure for the specific ports of a device.
  31  * @serial: pointer back to the struct usb_serial owner of this port.
  32  * @port: pointer to the corresponding tty_port for this port.
  33  * @lock: spinlock to grab when updating portions of this structure.
  34  * @mutex: mutex used to synchronize serial_open() and serial_close()
  35  *      access for this port.
  36  * @number: the number of the port (the minor number).
  37  * @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
  38  * @interrupt_in_urb: pointer to the interrupt in struct urb for this port.
  39  * @interrupt_in_endpointAddress: endpoint address for the interrupt in pipe
  40  *      for this port.
  41  * @interrupt_out_buffer: pointer to the interrupt out buffer for this port.
  42  * @interrupt_out_size: the size of the interrupt_out_buffer, in bytes.
  43  * @interrupt_out_urb: pointer to the interrupt out struct urb for this port.
  44  * @interrupt_out_endpointAddress: endpoint address for the interrupt out pipe
  45  *      for this port.
  46  * @bulk_in_buffer: pointer to the bulk in buffer for this port.
  47  * @bulk_in_size: the size of the bulk_in_buffer, in bytes.
  48  * @read_urb: pointer to the bulk in struct urb for this port.
  49  * @bulk_in_endpointAddress: endpoint address for the bulk in pipe for this
  50  *      port.
  51  * @bulk_out_buffer: pointer to the bulk out buffer for this port.
  52  * @bulk_out_size: the size of the bulk_out_buffer, in bytes.
  53  * @write_urb: pointer to the bulk out struct urb for this port.
  54  * @write_urb_busy: port`s writing status
  55  * @bulk_out_endpointAddress: endpoint address for the bulk out pipe for this
  56  *      port.
  57  * @write_wait: a wait_queue_head_t used by the port.
  58  * @work: work queue entry for the line discipline waking up.
  59  * @throttled: nonzero if the read urb is inactive to throttle the device
  60  * @throttle_req: nonzero if the tty wants to throttle us
  61  * @console: attached usb serial console
  62  * @dev: pointer to the serial device
  63  *
  64  * This structure is used by the usb-serial core and drivers for the specific
  65  * ports of a device.
  66  */
  67 struct usb_serial_port {
  68         struct usb_serial       *serial;
  69         struct tty_port         port;
  70         spinlock_t              lock;
  71         struct mutex            mutex;
  72         unsigned char           number;
  73
  74         unsigned char           *interrupt_in_buffer;
  75         struct urb              *interrupt_in_urb;
  76         __u8                    interrupt_in_endpointAddress;
  77
  78         unsigned char           *interrupt_out_buffer;
  79         int                     interrupt_out_size;
  80         struct urb              *interrupt_out_urb;
  81         __u8                    interrupt_out_endpointAddress;
  82
  83         unsigned char           *bulk_in_buffer;
  84         int                     bulk_in_size;
  85         struct urb              *read_urb;
  86         __u8                    bulk_in_endpointAddress;
  87
  88         unsigned char           *bulk_out_buffer;
  89         int                     bulk_out_size;
  90         struct urb              *write_urb;
  91         int                     write_urb_busy;
  92         __u8                    bulk_out_endpointAddress;
  93
  94         wait_queue_head_t       write_wait;
  95         struct work_struct      work;
  96         char                    throttled;
  97         char                    throttle_req;
  98         char                    console;
  99         struct device           dev;
 100 };
 101 #define to_usb_serial_port(d) container_of(d, struct usb_serial_port, dev)
 102
 103 /* get and set the port private data pointer helper functions */
 104 static inline void *usb_get_serial_port_data(struct usb_serial_port *port)
 105 {
 106         return dev_get_drvdata(&port->dev);
 107 }
 108
 109 static inline void usb_set_serial_port_data(struct usb_serial_port *port,
 110                                             void *data)
 111 {
 112         dev_set_drvdata(&port->dev, data);
 113 }
 114
 115 /**
 116  * usb_serial - structure used by the usb-serial core for a device
 117  * @dev: pointer to the struct usb_device for this device
 118  * @type: pointer to the struct usb_serial_driver for this device
 119  * @interface: pointer to the struct usb_interface for this device
 120  * @minor: the starting minor number for this device
 121  * @num_ports: the number of ports this device has
 122  * @num_interrupt_in: number of interrupt in endpoints we have
 123  * @num_interrupt_out: number of interrupt out endpoints we have
 124  * @num_bulk_in: number of bulk in endpoints we have
 125  * @num_bulk_out: number of bulk out endpoints we have
 126  * @port: array of struct usb_serial_port structures for the different ports.
 127  * @private: place to put any driver specific information that is needed.  The
 128  *      usb-serial driver is required to manage this data, the usb-serial core
 129  *      will not touch this.  Use usb_get_serial_data() and
 130  *      usb_set_serial_data() to access this.
 131  */
 132 struct usb_serial {
 133         struct usb_device               *dev;
 134         struct usb_serial_driver        *type;
 135         struct usb_interface            *interface;
 136         unsigned char                   disconnected:1;
 137         unsigned char                   suspending:1;
 138         unsigned char                   minor;
 139         unsigned char                   num_ports;
 140         unsigned char                   num_port_pointers;
 141         char                            num_interrupt_in;
 142         char                            num_interrupt_out;
 143         char                            num_bulk_in;
 144         char                            num_bulk_out;
 145         struct usb_serial_port          *port[MAX_NUM_PORTS];
 146         struct kref                     kref;
 147         struct mutex                    disc_mutex;
 148         void                            *private;
 149 };
 150 #define to_usb_serial(d) container_of(d, struct usb_serial, kref)
 151
 152 /* get and set the serial private data pointer helper functions */
 153 static inline void *usb_get_serial_data(struct usb_serial *serial)
 154 {
 155         return serial->private;
 156 }
 157
 158 static inline void usb_set_serial_data(struct usb_serial *serial, void *data)
 159 {
 160         serial->private = data;
 161 }
 162
 163 /**
 164  * usb_serial_driver - describes a usb serial driver
 165  * @description: pointer to a string that describes this driver.  This string
 166  *      used in the syslog messages when a device is inserted or removed.
 167  * @id_table: pointer to a list of usb_device_id structures that define all
 168  *      of the devices this structure can support.
 169  * @num_ports: the number of different ports this device will have.
 170  * @calc_num_ports: pointer to a function to determine how many ports this
 171  *      device has dynamically.  It will be called after the probe()
 172  *      callback is called, but before attach()
 173  * @probe: pointer to the driver's probe function.
 174  *      This will be called when the device is inserted into the system,
 175  *      but before the device has been fully initialized by the usb_serial
 176  *      subsystem.  Use this function to download any firmware to the device,
 177  *      or any other early initialization that might be needed.
 178  *      Return 0 to continue on with the initialization sequence.  Anything
 179  *      else will abort it.
 180  * @attach: pointer to the driver's attach function.
 181  *      This will be called when the struct usb_serial structure is fully set
 182  *      set up.  Do any local initialization of the device, or any private
 183  *      memory structure allocation at this point in time.
 184  * @shutdown: pointer to the driver's shutdown function.  This will be
 185  *      called when the device is removed from the system.
 186  * @usb_driver: pointer to the struct usb_driver that controls this
 187  *      device.  This is necessary to allow dynamic ids to be added to
 188  *      the driver from sysfs.
 189  *
 190  * This structure is defines a USB Serial driver.  It provides all of
 191  * the information that the USB serial core code needs.  If the function
 192  * pointers are defined, then the USB serial core code will call them when
 193  * the corresponding tty port functions are called.  If they are not
 194  * called, the generic serial function will be used instead.
 195  *
 196  * The driver.owner field should be set to the module owner of this driver.
 197  * The driver.name field should be set to the name of this driver (remember
 198  * it will show up in sysfs, so it needs to be short and to the point.
 199  * Using the module name is a good idea.)
 200  */
 201 struct usb_serial_driver {
 202         const char *description;
 203         const struct usb_device_id *id_table;
 204         char    num_ports;
 205
 206         struct list_head        driver_list;
 207         struct device_driver    driver;
 208         struct usb_driver       *usb_driver;
 209         struct usb_dynids       dynids;
 210
 211         int (*probe)(struct usb_serial *serial, const struct usb_device_id *id);
 212         int (*attach)(struct usb_serial *serial);
 213         int (*calc_num_ports) (struct usb_serial *serial);
 214
 215         void (*shutdown)(struct usb_serial *serial);
 216
 217         int (*port_probe)(struct usb_serial_port *port);
 218         int (*port_remove)(struct usb_serial_port *port);
 219
 220         int (*suspend)(struct usb_serial *serial, pm_message_t message);
 221         int (*resume)(struct usb_serial *serial);
 222
 223         /* serial function calls */
 224         /* Called by console with tty = NULL and by tty */
 225         int  (*open)(struct tty_struct *tty,
 226                         struct usb_serial_port *port, struct file *filp);
 227         void (*close)(struct usb_serial_port *port);
 228         int  (*write)(struct tty_struct *tty, struct usb_serial_port *port,
 229                         const unsigned char *buf, int count);
 230         /* Called only by the tty layer */
 231         int  (*write_room)(struct tty_struct *tty);
 232         int  (*ioctl)(struct tty_struct *tty, struct file *file,
 233                       unsigned int cmd, unsigned long arg);
 234         void (*set_termios)(struct tty_struct *tty,
 235                         struct usb_serial_port *port, struct ktermios *old);
 236         void (*break_ctl)(struct tty_struct *tty, int break_state);
 237         int  (*chars_in_buffer)(struct tty_struct *tty);
 238         void (*throttle)(struct tty_struct *tty);
 239         void (*unthrottle)(struct tty_struct *tty);
 240         int  (*tiocmget)(struct tty_struct *tty, struct file *file);
 241         int  (*tiocmset)(struct tty_struct *tty, struct file *file,
 242                          unsigned int set, unsigned int clear);
 243         /* Called by the tty layer for port level work. There may or may not
 244            be an attached tty at this point */
 245         void (*dtr_rts)(struct usb_serial_port *port, int on);
 246         int  (*carrier_raised)(struct usb_serial_port *port);
 247         /* USB events */
 248         void (*read_int_callback)(struct urb *urb);
 249         void (*write_int_callback)(struct urb *urb);
 250         void (*read_bulk_callback)(struct urb *urb);
 251         void (*write_bulk_callback)(struct urb *urb);
 252 };
 253 #define to_usb_serial_driver(d) \
 254         container_of(d, struct usb_serial_driver, driver)
 255
 256 extern int  usb_serial_register(struct usb_serial_driver *driver);
 257 extern void usb_serial_deregister(struct usb_serial_driver *driver);
 258 extern void usb_serial_port_softint(struct usb_serial_port *port);
 259
 260 extern int usb_serial_probe(struct usb_interface *iface,
 261                             const struct usb_device_id *id);
 262 extern void usb_serial_disconnect(struct usb_interface *iface);
 263
 264 extern int usb_serial_suspend(struct usb_interface *intf, pm_message_t message);
 265 extern int usb_serial_resume(struct usb_interface *intf);
 266
 267 extern int ezusb_writememory(struct usb_serial *serial, int address,
 268                              unsigned char *data, int length, __u8 bRequest);
 269 extern int ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit);
 270
 271 /* USB Serial console functions */
 272 #ifdef CONFIG_USB_SERIAL_CONSOLE
 273 extern void usb_serial_console_init(int debug, int minor);
 274 extern void usb_serial_console_exit(void);
 275 extern void usb_serial_console_disconnect(struct usb_serial *serial);
 276 #else
 277 static inline void usb_serial_console_init(int debug, int minor) { }
 278 static inline void usb_serial_console_exit(void) { }
 279 static inline void usb_serial_console_disconnect(struct usb_serial *serial) {}
 280 #endif
 281
 282 /* Functions needed by other parts of the usbserial core */
 283 extern struct usb_serial *usb_serial_get_by_index(unsigned int minor);
 284 extern void usb_serial_put(struct usb_serial *serial);
 285 extern int usb_serial_generic_open(struct tty_struct *tty,
 286                 struct usb_serial_port *port, struct file *filp);
 287 extern int usb_serial_generic_write(struct tty_struct *tty,
 288         struct usb_serial_port *port, const unsigned char *buf, int count);
 289 extern void usb_serial_generic_close(struct usb_serial_port *port);
 290 extern int usb_serial_generic_resume(struct usb_serial *serial);
 291 extern int usb_serial_generic_write_room(struct tty_struct *tty);
 292 extern int usb_serial_generic_chars_in_buffer(struct tty_struct *tty);
 293 extern void usb_serial_generic_read_bulk_callback(struct urb *urb);
 294 extern void usb_serial_generic_write_bulk_callback(struct urb *urb);
 295 extern void usb_serial_generic_throttle(struct tty_struct *tty);
 296 extern void usb_serial_generic_unthrottle(struct tty_struct *tty);
 297 extern void usb_serial_generic_shutdown(struct usb_serial *serial);
 298 extern int usb_serial_generic_register(int debug);
 299 extern void usb_serial_generic_deregister(void);
 300
 301 extern int usb_serial_bus_register(struct usb_serial_driver *device);
 302 extern void usb_serial_bus_deregister(struct usb_serial_driver *device);
 303
 304 extern struct usb_serial_driver usb_serial_generic_device;
 305 extern struct bus_type usb_serial_bus_type;
 306 extern struct tty_driver *usb_serial_tty_driver;
 307
 308 static inline void usb_serial_debug_data(int debug,
 309                                          struct device *dev,
 310                                          const char *function, int size,
 311                                          const unsigned char *data)
 312 {
 313         int i;
 314
 315         if (debug) {
 316                 dev_printk(KERN_DEBUG, dev, "%s - length = %d, data = ",
 317                            function, size);
 318                 for (i = 0; i < size; ++i)
 319                         printk("%.2x ", data[i]);
 320                 printk("\n");
 321         }
 322 }
 323
 324 /* Use our own dbg macro */
 325 #undef dbg
 326 #define dbg(format, arg...) \
 327         do { \
 328                 if (debug) \
 329                         printk(KERN_DEBUG "%s: " format "\n" , __FILE__ , \
 330                                 ## arg); \
 331         } while (0)
 332
 333
 334
 335 #endif /* __LINUX_USB_SERIAL_H */
 336