include/linux/usb/serial.h

   1 /*
   2  * USB Serial Converter stuff
   3  *
   4  *      Copyright (C) 1999 - 2012
   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 #include <linux/sysrq.h>
  19 #include <linux/kfifo.h>
  20
  21 #define SERIAL_TTY_MAJOR        188     /* Nice legal number now */
  22 #define SERIAL_TTY_MINORS       254     /* loads of devices :) */
  23 #define SERIAL_TTY_NO_MINOR     255     /* No minor was assigned */
  24
  25 /* The maximum number of ports one device can grab at once */
  26 #define MAX_NUM_PORTS           8
  27
  28 /* parity check flag */
  29 #define RELEVANT_IFLAG(iflag)   (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
  30
  31 /* USB serial flags */
  32 #define USB_SERIAL_WRITE_BUSY   0
  33
  34 /**
  35  * usb_serial_port: structure for the specific ports of a device.
  36  * @serial: pointer back to the struct usb_serial owner of this port.
  37  * @port: pointer to the corresponding tty_port for this port.
  38  * @lock: spinlock to grab when updating portions of this structure.
  39  * @number: the number of the port (the minor number).
  40  * @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
  41  * @interrupt_in_urb: pointer to the interrupt in struct urb for this port.
  42  * @interrupt_in_endpointAddress: endpoint address for the interrupt in pipe
  43  *      for this port.
  44  * @interrupt_out_buffer: pointer to the interrupt out buffer for this port.
  45  * @interrupt_out_size: the size of the interrupt_out_buffer, in bytes.
  46  * @interrupt_out_urb: pointer to the interrupt out struct urb for this port.
  47  * @interrupt_out_endpointAddress: endpoint address for the interrupt out pipe
  48  *      for this port.
  49  * @bulk_in_buffer: pointer to the bulk in buffer for this port.
  50  * @bulk_in_size: the size of the bulk_in_buffer, in bytes.
  51  * @read_urb: pointer to the bulk in struct urb for this port.
  52  * @bulk_in_endpointAddress: endpoint address for the bulk in pipe for this
  53  *      port.
  54  * @bulk_in_buffers: pointers to the bulk in buffers for this port
  55  * @read_urbs: pointers to the bulk in urbs for this port
  56  * @read_urbs_free: status bitmap the for bulk in urbs
  57  * @bulk_out_buffer: pointer to the bulk out buffer for this port.
  58  * @bulk_out_size: the size of the bulk_out_buffer, in bytes.
  59  * @write_urb: pointer to the bulk out struct urb for this port.
  60  * @write_fifo: kfifo used to buffer outgoing data
  61  * @bulk_out_buffers: pointers to the bulk out buffers for this port
  62  * @write_urbs: pointers to the bulk out urbs for this port
  63  * @write_urbs_free: status bitmap the for bulk out urbs
  64  * @tx_bytes: number of bytes currently in host stack queues
  65  * @bulk_out_endpointAddress: endpoint address for the bulk out pipe for this
  66  *      port.
  67  * @flags: usb serial port flags
  68  * @write_wait: a wait_queue_head_t used by the port.
  69  * @delta_msr_wait: modem-status-change wait queue
  70  * @work: work queue entry for the line discipline waking up.
  71  * @throttled: nonzero if the read urb is inactive to throttle the device
  72  * @throttle_req: nonzero if the tty wants to throttle us
  73  * @dev: pointer to the serial device
  74  *
  75  * This structure is used by the usb-serial core and drivers for the specific
  76  * ports of a device.
  77  */
  78 struct usb_serial_port {
  79         struct usb_serial       *serial;
  80         struct tty_port         port;
  81         spinlock_t              lock;
  82         unsigned char           number;
  83
  84         unsigned char           *interrupt_in_buffer;
  85         struct urb              *interrupt_in_urb;
  86         __u8                    interrupt_in_endpointAddress;
  87
  88         unsigned char           *interrupt_out_buffer;
  89         int                     interrupt_out_size;
  90         struct urb              *interrupt_out_urb;
  91         __u8                    interrupt_out_endpointAddress;
  92
  93         unsigned char           *bulk_in_buffer;
  94         int                     bulk_in_size;
  95         struct urb              *read_urb;
  96         __u8                    bulk_in_endpointAddress;
  97
  98         unsigned char           *bulk_in_buffers[2];
  99         struct urb              *read_urbs[2];
 100         unsigned long           read_urbs_free;
 101
 102         unsigned char           *bulk_out_buffer;
 103         int                     bulk_out_size;
 104         struct urb              *write_urb;
 105         struct kfifo            write_fifo;
 106
 107         unsigned char           *bulk_out_buffers[2];
 108         struct urb              *write_urbs[2];
 109         unsigned long           write_urbs_free;
 110         __u8                    bulk_out_endpointAddress;
 111
 112         int                     tx_bytes;
 113
 114         unsigned long           flags;
 115         wait_queue_head_t       write_wait;
 116         wait_queue_head_t       delta_msr_wait;
 117         struct work_struct      work;
 118         char                    throttled;
 119         char                    throttle_req;
 120         unsigned long           sysrq; /* sysrq timeout */
 121         struct device           dev;
 122 };
 123 #define to_usb_serial_port(d) container_of(d, struct usb_serial_port, dev)
 124
 125 /* get and set the port private data pointer helper functions */
 126 static inline void *usb_get_serial_port_data(struct usb_serial_port *port)
 127 {
 128         return dev_get_drvdata(&port->dev);
 129 }
 130
 131 static inline void usb_set_serial_port_data(struct usb_serial_port *port,
 132                                             void *data)
 133 {
 134         dev_set_drvdata(&port->dev, data);
 135 }
 136
 137 /**
 138  * usb_serial - structure used by the usb-serial core for a device
 139  * @dev: pointer to the struct usb_device for this device
 140  * @type: pointer to the struct usb_serial_driver for this device
 141  * @interface: pointer to the struct usb_interface for this device
 142  * @minor: the starting minor number for this device
 143  * @num_ports: the number of ports this device has
 144  * @num_interrupt_in: number of interrupt in endpoints we have
 145  * @num_interrupt_out: number of interrupt out endpoints we have
 146  * @num_bulk_in: number of bulk in endpoints we have
 147  * @num_bulk_out: number of bulk out endpoints we have
 148  * @port: array of struct usb_serial_port structures for the different ports.
 149  * @private: place to put any driver specific information that is needed.  The
 150  *      usb-serial driver is required to manage this data, the usb-serial core
 151  *      will not touch this.  Use usb_get_serial_data() and
 152  *      usb_set_serial_data() to access this.
 153  */
 154 struct usb_serial {
 155         struct usb_device               *dev;
 156         struct usb_serial_driver        *type;
 157         struct usb_interface            *interface;
 158         unsigned char                   disconnected:1;
 159         unsigned char                   suspending:1;
 160         unsigned char                   attached:1;
 161         unsigned char                   minor;
 162         unsigned char                   num_ports;
 163         unsigned char                   num_port_pointers;
 164         char                            num_interrupt_in;
 165         char                            num_interrupt_out;
 166         char                            num_bulk_in;
 167         char                            num_bulk_out;
 168         struct usb_serial_port          *port[MAX_NUM_PORTS];
 169         struct kref                     kref;
 170         struct mutex                    disc_mutex;
 171         void                            *private;
 172 };
 173 #define to_usb_serial(d) container_of(d, struct usb_serial, kref)
 174
 175 /* get and set the serial private data pointer helper functions */
 176 static inline void *usb_get_serial_data(struct usb_serial *serial)
 177 {
 178         return serial->private;
 179 }
 180
 181 static inline void usb_set_serial_data(struct usb_serial *serial, void *data)
 182 {
 183         serial->private = data;
 184 }
 185
 186 /**
 187  * usb_serial_driver - describes a usb serial driver
 188  * @description: pointer to a string that describes this driver.  This string
 189  *      used in the syslog messages when a device is inserted or removed.
 190  * @id_table: pointer to a list of usb_device_id structures that define all
 191  *      of the devices this structure can support.
 192  * @num_ports: the number of different ports this device will have.
 193  * @bulk_in_size: minimum number of bytes to allocate for bulk-in buffer
 194  *      (0 = end-point size)
 195  * @bulk_out_size: bytes to allocate for bulk-out buffer (0 = end-point size)
 196  * @calc_num_ports: pointer to a function to determine how many ports this
 197  *      device has dynamically.  It will be called after the probe()
 198  *      callback is called, but before attach()
 199  * @probe: pointer to the driver's probe function.
 200  *      This will be called when the device is inserted into the system,
 201  *      but before the device has been fully initialized by the usb_serial
 202  *      subsystem.  Use this function to download any firmware to the device,
 203  *      or any other early initialization that might be needed.
 204  *      Return 0 to continue on with the initialization sequence.  Anything
 205  *      else will abort it.
 206  * @attach: pointer to the driver's attach function.
 207  *      This will be called when the struct usb_serial structure is fully set
 208  *      set up.  Do any local initialization of the device, or any private
 209  *      memory structure allocation at this point in time.
 210  * @disconnect: pointer to the driver's disconnect function.  This will be
 211  *      called when the device is unplugged or unbound from the driver.
 212  * @release: pointer to the driver's release function.  This will be called
 213  *      when the usb_serial data structure is about to be destroyed.
 214  * @usb_driver: pointer to the struct usb_driver that controls this
 215  *      device.  This is necessary to allow dynamic ids to be added to
 216  *      the driver from sysfs.
 217  *
 218  * This structure is defines a USB Serial driver.  It provides all of
 219  * the information that the USB serial core code needs.  If the function
 220  * pointers are defined, then the USB serial core code will call them when
 221  * the corresponding tty port functions are called.  If they are not
 222  * called, the generic serial function will be used instead.
 223  *
 224  * The driver.owner field should be set to the module owner of this driver.
 225  * The driver.name field should be set to the name of this driver (remember
 226  * it will show up in sysfs, so it needs to be short and to the point.
 227  * Using the module name is a good idea.)
 228  */
 229 struct usb_serial_driver {
 230         const char *description;
 231         const struct usb_device_id *id_table;
 232         char    num_ports;
 233
 234         struct list_head        driver_list;
 235         struct device_driver    driver;
 236         struct usb_driver       *usb_driver;
 237         struct usb_dynids       dynids;
 238
 239         size_t                  bulk_in_size;
 240         size_t                  bulk_out_size;
 241
 242         int (*probe)(struct usb_serial *serial, const struct usb_device_id *id);
 243         int (*attach)(struct usb_serial *serial);
 244         int (*calc_num_ports) (struct usb_serial *serial);
 245
 246         void (*disconnect)(struct usb_serial *serial);
 247         void (*release)(struct usb_serial *serial);
 248
 249         int (*port_probe)(struct usb_serial_port *port);
 250         int (*port_remove)(struct usb_serial_port *port);
 251
 252         int (*suspend)(struct usb_serial *serial, pm_message_t message);
 253         int (*resume)(struct usb_serial *serial);
 254         int (*reset_resume)(struct usb_serial *serial);
 255
 256         /* serial function calls */
 257         /* Called by console and by the tty layer */
 258         int  (*open)(struct tty_struct *tty, struct usb_serial_port *port);
 259         void (*close)(struct usb_serial_port *port);
 260         int  (*write)(struct tty_struct *tty, struct usb_serial_port *port,
 261                         const unsigned char *buf, int count);
 262         /* Called only by the tty layer */
 263         int  (*write_room)(struct tty_struct *tty);
 264         int  (*ioctl)(struct tty_struct *tty,
 265                       unsigned int cmd, unsigned long arg);
 266         void (*set_termios)(struct tty_struct *tty,
 267                         struct usb_serial_port *port, struct ktermios *old);
 268         void (*break_ctl)(struct tty_struct *tty, int break_state);
 269         int  (*chars_in_buffer)(struct tty_struct *tty);
 270         void (*throttle)(struct tty_struct *tty);
 271         void (*unthrottle)(struct tty_struct *tty);
 272         int  (*tiocmget)(struct tty_struct *tty);
 273         int  (*tiocmset)(struct tty_struct *tty,
 274                          unsigned int set, unsigned int clear);
 275         int  (*get_icount)(struct tty_struct *tty,
 276                         struct serial_icounter_struct *icount);
 277         /* Called by the tty layer for port level work. There may or may not
 278            be an attached tty at this point */
 279         void (*dtr_rts)(struct usb_serial_port *port, int on);
 280         int  (*carrier_raised)(struct usb_serial_port *port);
 281         /* Called by the usb serial hooks to allow the user to rework the
 282            termios state */
 283         void (*init_termios)(struct tty_struct *tty);
 284         /* USB events */
 285         void (*read_int_callback)(struct urb *urb);
 286         void (*write_int_callback)(struct urb *urb);
 287         void (*read_bulk_callback)(struct urb *urb);
 288         void (*write_bulk_callback)(struct urb *urb);
 289         /* Called by the generic read bulk callback */
 290         void (*process_read_urb)(struct urb *urb);
 291         /* Called by the generic write implementation */
 292         int (*prepare_write_buffer)(struct usb_serial_port *port,
 293                                                 void *dest, size_t size);
 294 };
 295 #define to_usb_serial_driver(d) \
 296         container_of(d, struct usb_serial_driver, driver)
 297
 298 extern int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[],
 299                 const char *name, const struct usb_device_id *id_table);
 300 extern void usb_serial_deregister_drivers(struct usb_serial_driver *const serial_drivers[]);
 301 extern void usb_serial_port_softint(struct usb_serial_port *port);
 302
 303 extern int usb_serial_suspend(struct usb_interface *intf, pm_message_t message);
 304 extern int usb_serial_resume(struct usb_interface *intf);
 305
 306 /* USB Serial console functions */
 307 #ifdef CONFIG_USB_SERIAL_CONSOLE
 308 extern void usb_serial_console_init(int minor);
 309 extern void usb_serial_console_exit(void);
 310 extern void usb_serial_console_disconnect(struct usb_serial *serial);
 311 #else
 312 static inline void usb_serial_console_init(int minor) { }
 313 static inline void usb_serial_console_exit(void) { }
 314 static inline void usb_serial_console_disconnect(struct usb_serial *serial) {}
 315 #endif
 316
 317 /* Functions needed by other parts of the usbserial core */
 318 extern struct usb_serial *usb_serial_get_by_index(unsigned int minor);
 319 extern void usb_serial_put(struct usb_serial *serial);
 320 extern int usb_serial_generic_open(struct tty_struct *tty,
 321         struct usb_serial_port *port);
 322 extern int usb_serial_generic_write(struct tty_struct *tty,
 323         struct usb_serial_port *port, const unsigned char *buf, int count);
 324 extern void usb_serial_generic_close(struct usb_serial_port *port);
 325 extern int usb_serial_generic_resume(struct usb_serial *serial);
 326 extern int usb_serial_generic_write_room(struct tty_struct *tty);
 327 extern int usb_serial_generic_chars_in_buffer(struct tty_struct *tty);
 328 extern void usb_serial_generic_read_bulk_callback(struct urb *urb);
 329 extern void usb_serial_generic_write_bulk_callback(struct urb *urb);
 330 extern void usb_serial_generic_throttle(struct tty_struct *tty);
 331 extern void usb_serial_generic_unthrottle(struct tty_struct *tty);
 332 extern void usb_serial_generic_disconnect(struct usb_serial *serial);
 333 extern void usb_serial_generic_release(struct usb_serial *serial);
 334 extern int usb_serial_generic_register(void);
 335 extern void usb_serial_generic_deregister(void);
 336 extern int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port,
 337                                                  gfp_t mem_flags);
 338 extern void usb_serial_generic_process_read_urb(struct urb *urb);
 339 extern int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port,
 340                                                 void *dest, size_t size);
 341 extern int usb_serial_handle_sysrq_char(struct usb_serial_port *port,
 342                                         unsigned int ch);
 343 extern int usb_serial_handle_break(struct usb_serial_port *port);
 344 extern void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
 345                                          struct tty_struct *tty,
 346                                          unsigned int status);
 347
 348
 349 extern int usb_serial_bus_register(struct usb_serial_driver *device);
 350 extern void usb_serial_bus_deregister(struct usb_serial_driver *device);
 351
 352 extern struct usb_serial_driver usb_serial_generic_device;
 353 extern struct bus_type usb_serial_bus_type;
 354 extern struct tty_driver *usb_serial_tty_driver;
 355
 356 static inline void usb_serial_debug_data(struct device *dev,
 357                                          const char *function, int size,
 358                                          const unsigned char *data)
 359 {
 360         dev_dbg(dev, "%s - length = %d, data = %*ph\n",
 361                 function, size, size, data);
 362 }
 363
 364 /*
 365  * Macro for reporting errors in write path to avoid inifinite loop
 366  * when port is used as a console.
 367  */
 368 #define dev_err_console(usport, fmt, ...)                               \
 369 do {                                                                    \
 370         static bool __print_once;                                       \
 371         struct usb_serial_port *__port = (usport);                      \
 372                                                                         \
 373         if (!__port->port.console || !__print_once) {                   \
 374                 __print_once = true;                                    \
 375                 dev_err(&__port->dev, fmt, ##__VA_ARGS__);              \
 376         }                                                               \
 377 } while (0)
 378
 379 /*
 380  * module_usb_serial_driver() - Helper macro for registering a USB Serial driver
 381  * @__serial_drivers: list of usb_serial drivers to register
 382  * @__ids: all device ids that @__serial_drivers bind to
 383  *
 384  * Helper macro for USB serial drivers which do not do anything special
 385  * in module init/exit. This eliminates a lot of boilerplate. Each
 386  * module may only use this macro once, and calling it replaces
 387  * module_init() and module_exit()
 388  *
 389  */
 390 #define usb_serial_module_driver(__name, __serial_drivers, __ids)       \
 391 static int __init usb_serial_module_init(void)                          \
 392 {                                                                       \
 393         return usb_serial_register_drivers(__serial_drivers,            \
 394                                            __name, __ids);              \
 395 }                                                                       \
 396 module_init(usb_serial_module_init);                                    \
 397 static void __exit usb_serial_module_exit(void)                         \
 398 {                                                                       \
 399         usb_serial_deregister_drivers(__serial_drivers);                \
 400 }                                                                       \
 401 module_exit(usb_serial_module_exit);
 402
 403 #define module_usb_serial_driver(__serial_drivers, __ids)               \
 404         usb_serial_module_driver(KBUILD_MODNAME, __serial_drivers, __ids)
 405
 406 #endif /* __LINUX_USB_SERIAL_H */
 407