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 #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 enum port_dev_state {
  32         PORT_UNREGISTERED,
  33         PORT_REGISTERING,
  34         PORT_REGISTERED,
  35         PORT_UNREGISTERING,
  36 };
  37
  38 /**
  39  * usb_serial_port: structure for the specific ports of a device.
  40  * @serial: pointer back to the struct usb_serial owner of this port.
  41  * @port: pointer to the corresponding tty_port for this port.
  42  * @lock: spinlock to grab when updating portions of this structure.
  43  * @number: the number of the port (the minor number).
  44  * @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
  45  * @interrupt_in_urb: pointer to the interrupt in struct urb for this port.
  46  * @interrupt_in_endpointAddress: endpoint address for the interrupt in pipe
  47  *      for this port.
  48  * @interrupt_out_buffer: pointer to the interrupt out buffer for this port.
  49  * @interrupt_out_size: the size of the interrupt_out_buffer, in bytes.
  50  * @interrupt_out_urb: pointer to the interrupt out struct urb for this port.
  51  * @interrupt_out_endpointAddress: endpoint address for the interrupt out pipe
  52  *      for this port.
  53  * @bulk_in_buffer: pointer to the bulk in buffer for this port.
  54  * @bulk_in_size: the size of the bulk_in_buffer, in bytes.
  55  * @read_urb: pointer to the bulk in struct urb for this port.
  56  * @bulk_in_endpointAddress: endpoint address for the bulk in pipe for this
  57  *      port.
  58  * @bulk_out_buffer: pointer to the bulk out buffer for this port.
  59  * @bulk_out_size: the size of the bulk_out_buffer, in bytes.
  60  * @write_urb: pointer to the bulk out struct urb for this port.
  61  * @write_fifo: kfifo used to buffer outgoing data
  62  * @write_urb_busy: port`s writing status
  63  * @bulk_out_endpointAddress: endpoint address for the bulk out pipe for this
  64  *      port.
  65  * @write_wait: a wait_queue_head_t used by the port.
  66  * @work: work queue entry for the line discipline waking up.
  67  * @throttled: nonzero if the read urb is inactive to throttle the device
  68  * @throttle_req: nonzero if the tty wants to throttle us
  69  * @console: attached usb serial console
  70  * @dev: pointer to the serial device
  71  *
  72  * This structure is used by the usb-serial core and drivers for the specific
  73  * ports of a device.
  74  */
  75 struct usb_serial_port {
  76         struct usb_serial       *serial;
  77         struct tty_port         port;
  78         spinlock_t              lock;
  79         unsigned char           number;
  80
  81         unsigned char           *interrupt_in_buffer;
  82         struct urb              *interrupt_in_urb;
  83         __u8                    interrupt_in_endpointAddress;
  84
  85         unsigned char           *interrupt_out_buffer;
  86         int                     interrupt_out_size;
  87         struct urb              *interrupt_out_urb;
  88         __u8                    interrupt_out_endpointAddress;
  89
  90         unsigned char           *bulk_in_buffer;
  91         int                     bulk_in_size;
  92         struct urb              *read_urb;
  93         __u8                    bulk_in_endpointAddress;
  94
  95         unsigned char           *bulk_out_buffer;
  96         int                     bulk_out_size;
  97         struct urb              *write_urb;
  98         struct kfifo            write_fifo;
  99         int                     write_urb_busy;
 100         __u8                    bulk_out_endpointAddress;
 101
 102         int                     tx_bytes_flight;
 103         int                     urbs_in_flight;
 104
 105         wait_queue_head_t       write_wait;
 106         struct work_struct      work;
 107         char                    throttled;
 108         char                    throttle_req;
 109         char                    console;
 110         unsigned long           sysrq; /* sysrq timeout */
 111         struct device           dev;
 112         enum port_dev_state     dev_state;
 113 };
 114 #define to_usb_serial_port(d) container_of(d, struct usb_serial_port, dev)
 115
 116 /* get and set the port private data pointer helper functions */
 117 static inline void *usb_get_serial_port_data(struct usb_serial_port *port)
 118 {
 119         return dev_get_drvdata(&port->dev);
 120 }
 121
 122 static inline void usb_set_serial_port_data(struct usb_serial_port *port,
 123                                             void *data)
 124 {
 125         dev_set_drvdata(&port->dev, data);
 126 }
 127
 128 /**
 129  * usb_serial - structure used by the usb-serial core for a device
 130  * @dev: pointer to the struct usb_device for this device
 131  * @type: pointer to the struct usb_serial_driver for this device
 132  * @interface: pointer to the struct usb_interface for this device
 133  * @minor: the starting minor number for this device
 134  * @num_ports: the number of ports this device has
 135  * @num_interrupt_in: number of interrupt in endpoints we have
 136  * @num_interrupt_out: number of interrupt out endpoints we have
 137  * @num_bulk_in: number of bulk in endpoints we have
 138  * @num_bulk_out: number of bulk out endpoints we have
 139  * @port: array of struct usb_serial_port structures for the different ports.
 140  * @private: place to put any driver specific information that is needed.  The
 141  *      usb-serial driver is required to manage this data, the usb-serial core
 142  *      will not touch this.  Use usb_get_serial_data() and
 143  *      usb_set_serial_data() to access this.
 144  */
 145 struct usb_serial {
 146         struct usb_device               *dev;
 147         struct usb_serial_driver        *type;
 148         struct usb_interface            *interface;
 149         unsigned char                   disconnected:1;
 150         unsigned char                   suspending:1;
 151         unsigned char                   attached:1;
 152         unsigned char                   minor;
 153         unsigned char                   num_ports;
 154         unsigned char                   num_port_pointers;
 155         char                            num_interrupt_in;
 156         char                            num_interrupt_out;
 157         char                            num_bulk_in;
 158         char                            num_bulk_out;
 159         struct usb_serial_port          *port[MAX_NUM_PORTS];
 160         struct kref                     kref;
 161         struct mutex                    disc_mutex;
 162         void                            *private;
 163 };
 164 #define to_usb_serial(d) container_of(d, struct usb_serial, kref)
 165
 166 /* get and set the serial private data pointer helper functions */
 167 static inline void *usb_get_serial_data(struct usb_serial *serial)
 168 {
 169         return serial->private;
 170 }
 171
 172 static inline void usb_set_serial_data(struct usb_serial *serial, void *data)
 173 {
 174         serial->private = data;
 175 }
 176
 177 /**
 178  * usb_serial_driver - describes a usb serial driver
 179  * @description: pointer to a string that describes this driver.  This string
 180  *      used in the syslog messages when a device is inserted or removed.
 181  * @id_table: pointer to a list of usb_device_id structures that define all
 182  *      of the devices this structure can support.
 183  * @num_ports: the number of different ports this device will have.
 184  * @calc_num_ports: pointer to a function to determine how many ports this
 185  *      device has dynamically.  It will be called after the probe()
 186  *      callback is called, but before attach()
 187  * @probe: pointer to the driver's probe function.
 188  *      This will be called when the device is inserted into the system,
 189  *      but before the device has been fully initialized by the usb_serial
 190  *      subsystem.  Use this function to download any firmware to the device,
 191  *      or any other early initialization that might be needed.
 192  *      Return 0 to continue on with the initialization sequence.  Anything
 193  *      else will abort it.
 194  * @attach: pointer to the driver's attach function.
 195  *      This will be called when the struct usb_serial structure is fully set
 196  *      set up.  Do any local initialization of the device, or any private
 197  *      memory structure allocation at this point in time.
 198  * @disconnect: pointer to the driver's disconnect function.  This will be
 199  *      called when the device is unplugged or unbound from the driver.
 200  * @release: pointer to the driver's release function.  This will be called
 201  *      when the usb_serial data structure is about to be destroyed.
 202  * @usb_driver: pointer to the struct usb_driver that controls this
 203  *      device.  This is necessary to allow dynamic ids to be added to
 204  *      the driver from sysfs.
 205  *
 206  * This structure is defines a USB Serial driver.  It provides all of
 207  * the information that the USB serial core code needs.  If the function
 208  * pointers are defined, then the USB serial core code will call them when
 209  * the corresponding tty port functions are called.  If they are not
 210  * called, the generic serial function will be used instead.
 211  *
 212  * The driver.owner field should be set to the module owner of this driver.
 213  * The driver.name field should be set to the name of this driver (remember
 214  * it will show up in sysfs, so it needs to be short and to the point.
 215  * Using the module name is a good idea.)
 216  */
 217 struct usb_serial_driver {
 218         const char *description;
 219         const struct usb_device_id *id_table;
 220         char    num_ports;
 221
 222         struct list_head        driver_list;
 223         struct device_driver    driver;
 224         struct usb_driver       *usb_driver;
 225         struct usb_dynids       dynids;
 226         int                     max_in_flight_urbs;
 227
 228         int (*probe)(struct usb_serial *serial, const struct usb_device_id *id);
 229         int (*attach)(struct usb_serial *serial);
 230         int (*calc_num_ports) (struct usb_serial *serial);
 231
 232         void (*disconnect)(struct usb_serial *serial);
 233         void (*release)(struct usb_serial *serial);
 234
 235         int (*port_probe)(struct usb_serial_port *port);
 236         int (*port_remove)(struct usb_serial_port *port);
 237
 238         int (*suspend)(struct usb_serial *serial, pm_message_t message);
 239         int (*resume)(struct usb_serial *serial);
 240
 241         /* serial function calls */
 242         /* Called by console and by the tty layer */
 243         int  (*open)(struct tty_struct *tty, struct usb_serial_port *port);
 244         void (*close)(struct usb_serial_port *port);
 245         int  (*write)(struct tty_struct *tty, struct usb_serial_port *port,
 246                         const unsigned char *buf, int count);
 247         /* Called only by the tty layer */
 248         int  (*write_room)(struct tty_struct *tty);
 249         int  (*ioctl)(struct tty_struct *tty, struct file *file,
 250                       unsigned int cmd, unsigned long arg);
 251         void (*set_termios)(struct tty_struct *tty,
 252                         struct usb_serial_port *port, struct ktermios *old);
 253         void (*break_ctl)(struct tty_struct *tty, int break_state);
 254         int  (*chars_in_buffer)(struct tty_struct *tty);
 255         void (*throttle)(struct tty_struct *tty);
 256         void (*unthrottle)(struct tty_struct *tty);
 257         int  (*tiocmget)(struct tty_struct *tty, struct file *file);
 258         int  (*tiocmset)(struct tty_struct *tty, struct file *file,
 259                          unsigned int set, unsigned int clear);
 260         /* Called by the tty layer for port level work. There may or may not
 261            be an attached tty at this point */
 262         void (*dtr_rts)(struct usb_serial_port *port, int on);
 263         int  (*carrier_raised)(struct usb_serial_port *port);
 264         /* Called by the usb serial hooks to allow the user to rework the
 265            termios state */
 266         void (*init_termios)(struct tty_struct *tty);
 267         /* USB events */
 268         void (*read_int_callback)(struct urb *urb);
 269         void (*write_int_callback)(struct urb *urb);
 270         void (*read_bulk_callback)(struct urb *urb);
 271         void (*write_bulk_callback)(struct urb *urb);
 272 };
 273 #define to_usb_serial_driver(d) \
 274         container_of(d, struct usb_serial_driver, driver)
 275
 276 extern int  usb_serial_register(struct usb_serial_driver *driver);
 277 extern void usb_serial_deregister(struct usb_serial_driver *driver);
 278 extern void usb_serial_port_softint(struct usb_serial_port *port);
 279
 280 extern int usb_serial_probe(struct usb_interface *iface,
 281                             const struct usb_device_id *id);
 282 extern void usb_serial_disconnect(struct usb_interface *iface);
 283
 284 extern int usb_serial_suspend(struct usb_interface *intf, pm_message_t message);
 285 extern int usb_serial_resume(struct usb_interface *intf);
 286
 287 extern int ezusb_writememory(struct usb_serial *serial, int address,
 288                              unsigned char *data, int length, __u8 bRequest);
 289 extern int ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit);
 290
 291 /* USB Serial console functions */
 292 #ifdef CONFIG_USB_SERIAL_CONSOLE
 293 extern void usb_serial_console_init(int debug, int minor);
 294 extern void usb_serial_console_exit(void);
 295 extern void usb_serial_console_disconnect(struct usb_serial *serial);
 296 #else
 297 static inline void usb_serial_console_init(int debug, int minor) { }
 298 static inline void usb_serial_console_exit(void) { }
 299 static inline void usb_serial_console_disconnect(struct usb_serial *serial) {}
 300 #endif
 301
 302 /* Functions needed by other parts of the usbserial core */
 303 extern struct usb_serial *usb_serial_get_by_index(unsigned int minor);
 304 extern void usb_serial_put(struct usb_serial *serial);
 305 extern int usb_serial_generic_open(struct tty_struct *tty,
 306         struct usb_serial_port *port);
 307 extern int usb_serial_generic_write(struct tty_struct *tty,
 308         struct usb_serial_port *port, const unsigned char *buf, int count);
 309 extern void usb_serial_generic_close(struct usb_serial_port *port);
 310 extern int usb_serial_generic_resume(struct usb_serial *serial);
 311 extern int usb_serial_generic_write_room(struct tty_struct *tty);
 312 extern int usb_serial_generic_chars_in_buffer(struct tty_struct *tty);
 313 extern void usb_serial_generic_read_bulk_callback(struct urb *urb);
 314 extern void usb_serial_generic_write_bulk_callback(struct urb *urb);
 315 extern void usb_serial_generic_throttle(struct tty_struct *tty);
 316 extern void usb_serial_generic_unthrottle(struct tty_struct *tty);
 317 extern void usb_serial_generic_disconnect(struct usb_serial *serial);
 318 extern void usb_serial_generic_release(struct usb_serial *serial);
 319 extern int usb_serial_generic_register(int debug);
 320 extern void usb_serial_generic_deregister(void);
 321 extern void usb_serial_generic_resubmit_read_urb(struct usb_serial_port *port,
 322                                                  gfp_t mem_flags);
 323 extern int usb_serial_handle_sysrq_char(struct tty_struct *tty,
 324                                         struct usb_serial_port *port,
 325                                         unsigned int ch);
 326 extern int usb_serial_handle_break(struct usb_serial_port *port);
 327
 328
 329 extern int usb_serial_bus_register(struct usb_serial_driver *device);
 330 extern void usb_serial_bus_deregister(struct usb_serial_driver *device);
 331
 332 extern struct usb_serial_driver usb_serial_generic_device;
 333 extern struct bus_type usb_serial_bus_type;
 334 extern struct tty_driver *usb_serial_tty_driver;
 335
 336 static inline void usb_serial_debug_data(int debug,
 337                                          struct device *dev,
 338                                          const char *function, int size,
 339                                          const unsigned char *data)
 340 {
 341         int i;
 342
 343         if (debug) {
 344                 dev_printk(KERN_DEBUG, dev, "%s - length = %d, data = ",
 345                            function, size);
 346                 for (i = 0; i < size; ++i)
 347                         printk("%.2x ", data[i]);
 348                 printk("\n");
 349         }
 350 }
 351
 352 /* Use our own dbg macro */
 353 #undef dbg
 354 #define dbg(format, arg...) \
 355         do { \
 356                 if (debug) \
 357                         printk(KERN_DEBUG "%s: " format "\n" , __FILE__ , \
 358                                 ## arg); \
 359         } while (0)
 360
 361
 362
 363 #endif /* __LINUX_USB_SERIAL_H */
 364