drivers/usb/serial/metro-usb.c

   1 /*
   2   Some of this code is credited to Linux USB open source files that are
   3   distributed with Linux.
   4
   5   Copyright:    2007 Metrologic Instruments. All rights reserved.
   6   Copyright:    2011 Azimut Ltd. <http://azimutrzn.ru/>
   7 */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/tty.h>
  12 #include <linux/module.h>
  13 #include <linux/usb.h>
  14 #include <linux/errno.h>
  15 #include <linux/slab.h>
  16 #include <linux/tty_driver.h>
  17 #include <linux/tty_flip.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/usb/serial.h>
  22
  23 /* Version Information */
  24 #define DRIVER_VERSION "v1.2.0.0"
  25 #define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
  26
  27 /* Product information. */
  28 #define FOCUS_VENDOR_ID                 0x0C2E
  29 #define FOCUS_PRODUCT_ID_BI             0x0720
  30 #define FOCUS_PRODUCT_ID_UNI            0x0700
  31
  32 #define METROUSB_SET_REQUEST_TYPE       0x40
  33 #define METROUSB_SET_MODEM_CTRL_REQUEST 10
  34 #define METROUSB_SET_BREAK_REQUEST      0x40
  35 #define METROUSB_MCR_NONE               0x08    /* Deactivate DTR and RTS. */
  36 #define METROUSB_MCR_RTS                0x0a    /* Activate RTS. */
  37 #define METROUSB_MCR_DTR                0x09    /* Activate DTR. */
  38 #define WDR_TIMEOUT                     5000    /* default urb timeout. */
  39
  40 /* Private data structure. */
  41 struct metrousb_private {
  42         spinlock_t lock;
  43         int throttled;
  44         unsigned long control_state;
  45 };
  46
  47 /* Device table list. */
  48 static struct usb_device_id id_table[] = {
  49         { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
  50         { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
  51         { }, /* Terminating entry. */
  52 };
  53 MODULE_DEVICE_TABLE(usb, id_table);
  54
  55 /* UNI-Directional mode commands for device configure */
  56 #define UNI_CMD_OPEN    0x80
  57 #define UNI_CMD_CLOSE   0xFF
  58
  59 inline int metrousb_is_unidirectional_mode(struct usb_serial_port *port)
  60 {
  61         __u16 product_id = le16_to_cpu(
  62                 port->serial->dev->descriptor.idProduct);
  63
  64         return product_id == FOCUS_PRODUCT_ID_UNI;
  65 }
  66
  67 static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
  68 {
  69         int ret;
  70         int actual_len;
  71         u8 *buffer_cmd = NULL;
  72
  73         if (!metrousb_is_unidirectional_mode(port))
  74                 return 0;
  75
  76         buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
  77         if (!buffer_cmd)
  78                 return -ENOMEM;
  79
  80         *buffer_cmd = cmd;
  81
  82         ret = usb_interrupt_msg(port->serial->dev,
  83                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
  84                 buffer_cmd, sizeof(cmd),
  85                 &actual_len, USB_CTRL_SET_TIMEOUT);
  86
  87         kfree(buffer_cmd);
  88
  89         if (ret < 0)
  90                 return ret;
  91         else if (actual_len != sizeof(cmd))
  92                 return -EIO;
  93         return 0;
  94 }
  95
  96 static void metrousb_read_int_callback(struct urb *urb)
  97 {
  98         struct usb_serial_port *port = urb->context;
  99         struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
 100         struct tty_struct *tty;
 101         unsigned char *data = urb->transfer_buffer;
 102         int throttled = 0;
 103         int result = 0;
 104         unsigned long flags = 0;
 105
 106         dev_dbg(&port->dev, "%s\n", __func__);
 107
 108         switch (urb->status) {
 109         case 0:
 110                 /* Success status, read from the port. */
 111                 break;
 112         case -ECONNRESET:
 113         case -ENOENT:
 114         case -ESHUTDOWN:
 115                 /* urb has been terminated. */
 116                 dev_dbg(&port->dev,
 117                         "%s - urb shutting down, error code=%d\n",
 118                         __func__, urb->status);
 119                 return;
 120         default:
 121                 dev_dbg(&port->dev,
 122                         "%s - non-zero urb received, error code=%d\n",
 123                         __func__, urb->status);
 124                 goto exit;
 125         }
 126
 127
 128         /* Set the data read from the usb port into the serial port buffer. */
 129         tty = tty_port_tty_get(&port->port);
 130         if (tty && urb->actual_length) {
 131                 /* Loop through the data copying each byte to the tty layer. */
 132                 tty_insert_flip_string(tty, data, urb->actual_length);
 133
 134                 /* Force the data to the tty layer. */
 135                 tty_flip_buffer_push(tty);
 136         }
 137         tty_kref_put(tty);
 138
 139         /* Set any port variables. */
 140         spin_lock_irqsave(&metro_priv->lock, flags);
 141         throttled = metro_priv->throttled;
 142         spin_unlock_irqrestore(&metro_priv->lock, flags);
 143
 144         /* Continue trying to read if set. */
 145         if (!throttled) {
 146                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
 147                                  usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
 148                                  port->interrupt_in_urb->transfer_buffer,
 149                                  port->interrupt_in_urb->transfer_buffer_length,
 150                                  metrousb_read_int_callback, port, 1);
 151
 152                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
 153
 154                 if (result)
 155                         dev_err(&port->dev,
 156                                 "%s - failed submitting interrupt in urb, error code=%d\n",
 157                                 __func__, result);
 158         }
 159         return;
 160
 161 exit:
 162         /* Try to resubmit the urb. */
 163         result = usb_submit_urb(urb, GFP_ATOMIC);
 164         if (result)
 165                 dev_err(&port->dev,
 166                         "%s - failed submitting interrupt in urb, error code=%d\n",
 167                         __func__, result);
 168 }
 169
 170 static void metrousb_write_int_callback(struct urb *urb)
 171 {
 172         struct usb_serial_port *port = urb->context;
 173
 174         dev_warn(&port->dev, "%s not implemented yet.\n",
 175                 __func__);
 176 }
 177
 178 static void metrousb_cleanup(struct usb_serial_port *port)
 179 {
 180         dev_dbg(&port->dev, "%s\n", __func__);
 181
 182         if (port->serial->dev) {
 183                 /* Shutdown any interrupt in urbs. */
 184                 if (port->interrupt_in_urb) {
 185                         usb_unlink_urb(port->interrupt_in_urb);
 186                         usb_kill_urb(port->interrupt_in_urb);
 187                 }
 188
 189                 /* Send deactivate cmd to device */
 190                 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
 191         }
 192 }
 193
 194 static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
 195 {
 196         struct usb_serial *serial = port->serial;
 197         struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
 198         unsigned long flags = 0;
 199         int result = 0;
 200
 201         dev_dbg(&port->dev, "%s\n", __func__);
 202
 203         /* Make sure the urb is initialized. */
 204         if (!port->interrupt_in_urb) {
 205                 dev_err(&port->dev, "%s - interrupt urb not initialized\n",
 206                         __func__);
 207                 return -ENODEV;
 208         }
 209
 210         /* Set the private data information for the port. */
 211         spin_lock_irqsave(&metro_priv->lock, flags);
 212         metro_priv->control_state = 0;
 213         metro_priv->throttled = 0;
 214         spin_unlock_irqrestore(&metro_priv->lock, flags);
 215
 216         /* Clear the urb pipe. */
 217         usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
 218
 219         /* Start reading from the device */
 220         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 221                           usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 222                            port->interrupt_in_urb->transfer_buffer,
 223                            port->interrupt_in_urb->transfer_buffer_length,
 224                            metrousb_read_int_callback, port, 1);
 225         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 226
 227         if (result) {
 228                 dev_err(&port->dev,
 229                         "%s - failed submitting interrupt in urb, error code=%d\n",
 230                         __func__, result);
 231                 goto exit;
 232         }
 233
 234         /* Send activate cmd to device */
 235         result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
 236         if (result) {
 237                 dev_err(&port->dev,
 238                         "%s - failed to configure device for port number=%d, error code=%d\n",
 239                         __func__, port->number, result);
 240                 goto exit;
 241         }
 242
 243         dev_dbg(&port->dev, "%s - port open\n", __func__);
 244 exit:
 245         return result;
 246 }
 247
 248 static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
 249 {
 250         int retval = 0;
 251         unsigned char mcr = METROUSB_MCR_NONE;
 252
 253         dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
 254                 __func__, control_state);
 255
 256         /* Set the modem control value. */
 257         if (control_state & TIOCM_DTR)
 258                 mcr |= METROUSB_MCR_DTR;
 259         if (control_state & TIOCM_RTS)
 260                 mcr |= METROUSB_MCR_RTS;
 261
 262         /* Send the command to the usb port. */
 263         retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 264                                 METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
 265                                 control_state, 0, NULL, 0, WDR_TIMEOUT);
 266         if (retval < 0)
 267                 dev_err(&serial->dev->dev,
 268                         "%s - set modem ctrl=0x%x failed, error code=%d\n",
 269                         __func__, mcr, retval);
 270
 271         return retval;
 272 }
 273
 274 static void metrousb_shutdown(struct usb_serial *serial)
 275 {
 276         int i = 0;
 277
 278         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 279
 280         /* Stop reading and writing on all ports. */
 281         for (i = 0; i < serial->num_ports; ++i) {
 282                 /* Close any open urbs. */
 283                 metrousb_cleanup(serial->port[i]);
 284
 285                 /* Free memory. */
 286                 kfree(usb_get_serial_port_data(serial->port[i]));
 287                 usb_set_serial_port_data(serial->port[i], NULL);
 288
 289                 dev_dbg(&serial->dev->dev, "%s - freed port number=%d\n",
 290                         __func__, serial->port[i]->number);
 291         }
 292 }
 293
 294 static int metrousb_startup(struct usb_serial *serial)
 295 {
 296         struct metrousb_private *metro_priv;
 297         struct usb_serial_port *port;
 298         int i = 0;
 299
 300         dev_dbg(&serial->dev->dev, "%s\n", __func__);
 301
 302         /* Loop through the serial ports setting up the private structures.
 303          * Currently we only use one port. */
 304         for (i = 0; i < serial->num_ports; ++i) {
 305                 port = serial->port[i];
 306
 307                 /* Declare memory. */
 308                 metro_priv = kzalloc(sizeof(struct metrousb_private), GFP_KERNEL);
 309                 if (!metro_priv)
 310                         return -ENOMEM;
 311
 312                 /* Initialize memory. */
 313                 spin_lock_init(&metro_priv->lock);
 314                 usb_set_serial_port_data(port, metro_priv);
 315
 316                 dev_dbg(&serial->dev->dev, "%s - port number=%d\n ",
 317                         __func__, port->number);
 318         }
 319
 320         return 0;
 321 }
 322
 323 static void metrousb_throttle(struct tty_struct *tty)
 324 {
 325         struct usb_serial_port *port = tty->driver_data;
 326         struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
 327         unsigned long flags = 0;
 328
 329         dev_dbg(tty->dev, "%s\n", __func__);
 330
 331         /* Set the private information for the port to stop reading data. */
 332         spin_lock_irqsave(&metro_priv->lock, flags);
 333         metro_priv->throttled = 1;
 334         spin_unlock_irqrestore(&metro_priv->lock, flags);
 335 }
 336
 337 static int metrousb_tiocmget(struct tty_struct *tty)
 338 {
 339         unsigned long control_state = 0;
 340         struct usb_serial_port *port = tty->driver_data;
 341         struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
 342         unsigned long flags = 0;
 343
 344         dev_dbg(tty->dev, "%s\n", __func__);
 345
 346         spin_lock_irqsave(&metro_priv->lock, flags);
 347         control_state = metro_priv->control_state;
 348         spin_unlock_irqrestore(&metro_priv->lock, flags);
 349
 350         return control_state;
 351 }
 352
 353 static int metrousb_tiocmset(struct tty_struct *tty,
 354                              unsigned int set, unsigned int clear)
 355 {
 356         struct usb_serial_port *port = tty->driver_data;
 357         struct usb_serial *serial = port->serial;
 358         struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
 359         unsigned long flags = 0;
 360         unsigned long control_state = 0;
 361
 362         dev_dbg(tty->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);
 363
 364         spin_lock_irqsave(&metro_priv->lock, flags);
 365         control_state = metro_priv->control_state;
 366
 367         /* Set the RTS and DTR values. */
 368         if (set & TIOCM_RTS)
 369                 control_state |= TIOCM_RTS;
 370         if (set & TIOCM_DTR)
 371                 control_state |= TIOCM_DTR;
 372         if (clear & TIOCM_RTS)
 373                 control_state &= ~TIOCM_RTS;
 374         if (clear & TIOCM_DTR)
 375                 control_state &= ~TIOCM_DTR;
 376
 377         metro_priv->control_state = control_state;
 378         spin_unlock_irqrestore(&metro_priv->lock, flags);
 379         return metrousb_set_modem_ctrl(serial, control_state);
 380 }
 381
 382 static void metrousb_unthrottle(struct tty_struct *tty)
 383 {
 384         struct usb_serial_port *port = tty->driver_data;
 385         struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
 386         unsigned long flags = 0;
 387         int result = 0;
 388
 389         dev_dbg(tty->dev, "%s\n", __func__);
 390
 391         /* Set the private information for the port to resume reading data. */
 392         spin_lock_irqsave(&metro_priv->lock, flags);
 393         metro_priv->throttled = 0;
 394         spin_unlock_irqrestore(&metro_priv->lock, flags);
 395
 396         /* Submit the urb to read from the port. */
 397         port->interrupt_in_urb->dev = port->serial->dev;
 398         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
 399         if (result)
 400                 dev_err(tty->dev,
 401                         "failed submitting interrupt in urb error code=%d\n",
 402                         result);
 403 }
 404
 405 static struct usb_serial_driver metrousb_device = {
 406         .driver = {
 407                 .owner =        THIS_MODULE,
 408                 .name =         "metro-usb",
 409         },
 410         .description            = "Metrologic USB to Serial",
 411         .id_table               = id_table,
 412         .num_ports              = 1,
 413         .open                   = metrousb_open,
 414         .close                  = metrousb_cleanup,
 415         .read_int_callback      = metrousb_read_int_callback,
 416         .write_int_callback     = metrousb_write_int_callback,
 417         .attach                 = metrousb_startup,
 418         .release                = metrousb_shutdown,
 419         .throttle               = metrousb_throttle,
 420         .unthrottle             = metrousb_unthrottle,
 421         .tiocmget               = metrousb_tiocmget,
 422         .tiocmset               = metrousb_tiocmset,
 423 };
 424
 425 static struct usb_serial_driver * const serial_drivers[] = {
 426         &metrousb_device,
 427         NULL,
 428 };
 429
 430 module_usb_serial_driver(serial_drivers, id_table);
 431
 432 MODULE_LICENSE("GPL");
 433 MODULE_AUTHOR("Philip Nicastro");
 434 MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
 435 MODULE_DESCRIPTION(DRIVER_DESC);