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 usb_unlink_urb(port->interrupt_in_urb); 183 usb_kill_urb(port->interrupt_in_urb); 184 185 mutex_lock(&port->serial->disc_mutex); 186 if (!port->serial->disconnected) 187 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port); 188 mutex_unlock(&port->serial->disc_mutex); 189 } 190 191 static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port) 192 { 193 struct usb_serial *serial = port->serial; 194 struct metrousb_private *metro_priv = usb_get_serial_port_data(port); 195 unsigned long flags = 0; 196 int result = 0; 197 198 dev_dbg(&port->dev, "%s\n", __func__); 199 200 /* Make sure the urb is initialized. */ 201 if (!port->interrupt_in_urb) { 202 dev_err(&port->dev, "%s - interrupt urb not initialized\n", 203 __func__); 204 return -ENODEV; 205 } 206 207 /* Set the private data information for the port. */ 208 spin_lock_irqsave(&metro_priv->lock, flags); 209 metro_priv->control_state = 0; 210 metro_priv->throttled = 0; 211 spin_unlock_irqrestore(&metro_priv->lock, flags); 212 213 /* Clear the urb pipe. */ 214 usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe); 215 216 /* Start reading from the device */ 217 usb_fill_int_urb(port->interrupt_in_urb, serial->dev, 218 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress), 219 port->interrupt_in_urb->transfer_buffer, 220 port->interrupt_in_urb->transfer_buffer_length, 221 metrousb_read_int_callback, port, 1); 222 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 223 224 if (result) { 225 dev_err(&port->dev, 226 "%s - failed submitting interrupt in urb, error code=%d\n", 227 __func__, result); 228 goto exit; 229 } 230 231 /* Send activate cmd to device */ 232 result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port); 233 if (result) { 234 dev_err(&port->dev, 235 "%s - failed to configure device for port number=%d, error code=%d\n", 236 __func__, port->number, result); 237 goto exit; 238 } 239 240 dev_dbg(&port->dev, "%s - port open\n", __func__); 241 exit: 242 return result; 243 } 244 245 static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state) 246 { 247 int retval = 0; 248 unsigned char mcr = METROUSB_MCR_NONE; 249 250 dev_dbg(&serial->dev->dev, "%s - control state = %d\n", 251 __func__, control_state); 252 253 /* Set the modem control value. */ 254 if (control_state & TIOCM_DTR) 255 mcr |= METROUSB_MCR_DTR; 256 if (control_state & TIOCM_RTS) 257 mcr |= METROUSB_MCR_RTS; 258 259 /* Send the command to the usb port. */ 260 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 261 METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST, 262 control_state, 0, NULL, 0, WDR_TIMEOUT); 263 if (retval < 0) 264 dev_err(&serial->dev->dev, 265 "%s - set modem ctrl=0x%x failed, error code=%d\n", 266 __func__, mcr, retval); 267 268 return retval; 269 } 270 271 static int metrousb_port_probe(struct usb_serial_port *port) 272 { 273 struct metrousb_private *metro_priv; 274 275 metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL); 276 if (!metro_priv) 277 return -ENOMEM; 278 279 spin_lock_init(&metro_priv->lock); 280 281 usb_set_serial_port_data(port, metro_priv); 282 283 return 0; 284 } 285 286 static int metrousb_port_remove(struct usb_serial_port *port) 287 { 288 struct metrousb_private *metro_priv; 289 290 metro_priv = usb_get_serial_port_data(port); 291 kfree(metro_priv); 292 293 return 0; 294 } 295 296 static void metrousb_throttle(struct tty_struct *tty) 297 { 298 struct usb_serial_port *port = tty->driver_data; 299 struct metrousb_private *metro_priv = usb_get_serial_port_data(port); 300 unsigned long flags = 0; 301 302 dev_dbg(tty->dev, "%s\n", __func__); 303 304 /* Set the private information for the port to stop reading data. */ 305 spin_lock_irqsave(&metro_priv->lock, flags); 306 metro_priv->throttled = 1; 307 spin_unlock_irqrestore(&metro_priv->lock, flags); 308 } 309 310 static int metrousb_tiocmget(struct tty_struct *tty) 311 { 312 unsigned long control_state = 0; 313 struct usb_serial_port *port = tty->driver_data; 314 struct metrousb_private *metro_priv = usb_get_serial_port_data(port); 315 unsigned long flags = 0; 316 317 dev_dbg(tty->dev, "%s\n", __func__); 318 319 spin_lock_irqsave(&metro_priv->lock, flags); 320 control_state = metro_priv->control_state; 321 spin_unlock_irqrestore(&metro_priv->lock, flags); 322 323 return control_state; 324 } 325 326 static int metrousb_tiocmset(struct tty_struct *tty, 327 unsigned int set, unsigned int clear) 328 { 329 struct usb_serial_port *port = tty->driver_data; 330 struct usb_serial *serial = port->serial; 331 struct metrousb_private *metro_priv = usb_get_serial_port_data(port); 332 unsigned long flags = 0; 333 unsigned long control_state = 0; 334 335 dev_dbg(tty->dev, "%s - set=%d, clear=%d\n", __func__, set, clear); 336 337 spin_lock_irqsave(&metro_priv->lock, flags); 338 control_state = metro_priv->control_state; 339 340 /* Set the RTS and DTR values. */ 341 if (set & TIOCM_RTS) 342 control_state |= TIOCM_RTS; 343 if (set & TIOCM_DTR) 344 control_state |= TIOCM_DTR; 345 if (clear & TIOCM_RTS) 346 control_state &= ~TIOCM_RTS; 347 if (clear & TIOCM_DTR) 348 control_state &= ~TIOCM_DTR; 349 350 metro_priv->control_state = control_state; 351 spin_unlock_irqrestore(&metro_priv->lock, flags); 352 return metrousb_set_modem_ctrl(serial, control_state); 353 } 354 355 static void metrousb_unthrottle(struct tty_struct *tty) 356 { 357 struct usb_serial_port *port = tty->driver_data; 358 struct metrousb_private *metro_priv = usb_get_serial_port_data(port); 359 unsigned long flags = 0; 360 int result = 0; 361 362 dev_dbg(tty->dev, "%s\n", __func__); 363 364 /* Set the private information for the port to resume reading data. */ 365 spin_lock_irqsave(&metro_priv->lock, flags); 366 metro_priv->throttled = 0; 367 spin_unlock_irqrestore(&metro_priv->lock, flags); 368 369 /* Submit the urb to read from the port. */ 370 port->interrupt_in_urb->dev = port->serial->dev; 371 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 372 if (result) 373 dev_err(tty->dev, 374 "failed submitting interrupt in urb error code=%d\n", 375 result); 376 } 377 378 static struct usb_serial_driver metrousb_device = { 379 .driver = { 380 .owner = THIS_MODULE, 381 .name = "metro-usb", 382 }, 383 .description = "Metrologic USB to Serial", 384 .id_table = id_table, 385 .num_ports = 1, 386 .open = metrousb_open, 387 .close = metrousb_cleanup, 388 .read_int_callback = metrousb_read_int_callback, 389 .write_int_callback = metrousb_write_int_callback, 390 .port_probe = metrousb_port_probe, 391 .port_remove = metrousb_port_remove, 392 .throttle = metrousb_throttle, 393 .unthrottle = metrousb_unthrottle, 394 .tiocmget = metrousb_tiocmget, 395 .tiocmset = metrousb_tiocmset, 396 }; 397 398 static struct usb_serial_driver * const serial_drivers[] = { 399 &metrousb_device, 400 NULL, 401 }; 402 403 module_usb_serial_driver(serial_drivers, id_table); 404 405 MODULE_LICENSE("GPL"); 406 MODULE_AUTHOR("Philip Nicastro"); 407 MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>"); 408 MODULE_DESCRIPTION(DRIVER_DESC); 409