1 /* 2 * USB Serial Converter Generic functions 3 * 4 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 8 * 2 as published by the Free Software Foundation. 9 * 10 */ 11 12 #include <linux/config.h> 13 #include <linux/kernel.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/tty.h> 17 #include <linux/tty_flip.h> 18 #include <linux/module.h> 19 #include <linux/moduleparam.h> 20 #include <linux/usb.h> 21 #include <asm/uaccess.h> 22 #include "usb-serial.h" 23 24 static int debug; 25 26 #ifdef CONFIG_USB_SERIAL_GENERIC 27 static __u16 vendor = 0x05f9; 28 static __u16 product = 0xffff; 29 30 module_param(vendor, ushort, 0); 31 MODULE_PARM_DESC(vendor, "User specified USB idVendor"); 32 33 module_param(product, ushort, 0); 34 MODULE_PARM_DESC(product, "User specified USB idProduct"); 35 36 static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ 37 38 /* All of the device info needed for the Generic Serial Converter */ 39 struct usb_serial_driver usb_serial_generic_device = { 40 .driver = { 41 .owner = THIS_MODULE, 42 .name = "generic", 43 }, 44 .id_table = generic_device_ids, 45 .num_interrupt_in = NUM_DONT_CARE, 46 .num_bulk_in = NUM_DONT_CARE, 47 .num_bulk_out = NUM_DONT_CARE, 48 .num_ports = 1, 49 .shutdown = usb_serial_generic_shutdown, 50 }; 51 52 /* we want to look at all devices, as the vendor/product id can change 53 * depending on the command line argument */ 54 static struct usb_device_id generic_serial_ids[] = { 55 {.driver_info = 42}, 56 {} 57 }; 58 59 static int generic_probe(struct usb_interface *interface, 60 const struct usb_device_id *id) 61 { 62 const struct usb_device_id *id_pattern; 63 64 id_pattern = usb_match_id(interface, generic_device_ids); 65 if (id_pattern != NULL) 66 return usb_serial_probe(interface, id); 67 return -ENODEV; 68 } 69 70 static struct usb_driver generic_driver = { 71 .name = "usbserial_generic", 72 .probe = generic_probe, 73 .disconnect = usb_serial_disconnect, 74 .id_table = generic_serial_ids, 75 .no_dynamic_id = 1, 76 }; 77 #endif 78 79 int usb_serial_generic_register (int _debug) 80 { 81 int retval = 0; 82 83 debug = _debug; 84 #ifdef CONFIG_USB_SERIAL_GENERIC 85 generic_device_ids[0].idVendor = vendor; 86 generic_device_ids[0].idProduct = product; 87 generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; 88 89 /* register our generic driver with ourselves */ 90 retval = usb_serial_register (&usb_serial_generic_device); 91 if (retval) 92 goto exit; 93 retval = usb_register(&generic_driver); 94 if (retval) 95 usb_serial_deregister(&usb_serial_generic_device); 96 exit: 97 #endif 98 return retval; 99 } 100 101 void usb_serial_generic_deregister (void) 102 { 103 #ifdef CONFIG_USB_SERIAL_GENERIC 104 /* remove our generic driver */ 105 usb_deregister(&generic_driver); 106 usb_serial_deregister (&usb_serial_generic_device); 107 #endif 108 } 109 110 int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp) 111 { 112 struct usb_serial *serial = port->serial; 113 int result = 0; 114 115 dbg("%s - port %d", __FUNCTION__, port->number); 116 117 /* force low_latency on so that our tty_push actually forces the data through, 118 otherwise it is scheduled, and with high data rates (like with OHCI) data 119 can get lost. */ 120 if (port->tty) 121 port->tty->low_latency = 1; 122 123 /* if we have a bulk interrupt, start reading from it */ 124 if (serial->num_bulk_in) { 125 /* Start reading from the device */ 126 usb_fill_bulk_urb (port->read_urb, serial->dev, 127 usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), 128 port->read_urb->transfer_buffer, 129 port->read_urb->transfer_buffer_length, 130 ((serial->type->read_bulk_callback) ? 131 serial->type->read_bulk_callback : 132 usb_serial_generic_read_bulk_callback), 133 port); 134 result = usb_submit_urb(port->read_urb, GFP_KERNEL); 135 if (result) 136 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); 137 } 138 139 return result; 140 } 141 142 static void generic_cleanup (struct usb_serial_port *port) 143 { 144 struct usb_serial *serial = port->serial; 145 146 dbg("%s - port %d", __FUNCTION__, port->number); 147 148 if (serial->dev) { 149 /* shutdown any bulk reads that might be going on */ 150 if (serial->num_bulk_out) 151 usb_kill_urb(port->write_urb); 152 if (serial->num_bulk_in) 153 usb_kill_urb(port->read_urb); 154 } 155 } 156 157 void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp) 158 { 159 dbg("%s - port %d", __FUNCTION__, port->number); 160 generic_cleanup (port); 161 } 162 163 int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *buf, int count) 164 { 165 struct usb_serial *serial = port->serial; 166 int result; 167 unsigned char *data; 168 169 dbg("%s - port %d", __FUNCTION__, port->number); 170 171 if (count == 0) { 172 dbg("%s - write request of 0 bytes", __FUNCTION__); 173 return (0); 174 } 175 176 /* only do something if we have a bulk out endpoint */ 177 if (serial->num_bulk_out) { 178 spin_lock(&port->lock); 179 if (port->write_urb_busy) { 180 spin_unlock(&port->lock); 181 dbg("%s - already writing", __FUNCTION__); 182 return 0; 183 } 184 port->write_urb_busy = 1; 185 spin_unlock(&port->lock); 186 187 count = (count > port->bulk_out_size) ? port->bulk_out_size : count; 188 189 memcpy (port->write_urb->transfer_buffer, buf, count); 190 data = port->write_urb->transfer_buffer; 191 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data); 192 193 /* set up our urb */ 194 usb_fill_bulk_urb (port->write_urb, serial->dev, 195 usb_sndbulkpipe (serial->dev, 196 port->bulk_out_endpointAddress), 197 port->write_urb->transfer_buffer, count, 198 ((serial->type->write_bulk_callback) ? 199 serial->type->write_bulk_callback : 200 usb_serial_generic_write_bulk_callback), port); 201 202 /* send the data out the bulk port */ 203 port->write_urb_busy = 1; 204 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 205 if (result) { 206 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result); 207 /* don't have to grab the lock here, as we will retry if != 0 */ 208 port->write_urb_busy = 0; 209 } else 210 result = count; 211 212 return result; 213 } 214 215 /* no bulk out, so return 0 bytes written */ 216 return 0; 217 } 218 219 int usb_serial_generic_write_room (struct usb_serial_port *port) 220 { 221 struct usb_serial *serial = port->serial; 222 int room = 0; 223 224 dbg("%s - port %d", __FUNCTION__, port->number); 225 226 if (serial->num_bulk_out) { 227 if (!(port->write_urb_busy)) 228 room = port->bulk_out_size; 229 } 230 231 dbg("%s - returns %d", __FUNCTION__, room); 232 return (room); 233 } 234 235 int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port) 236 { 237 struct usb_serial *serial = port->serial; 238 int chars = 0; 239 240 dbg("%s - port %d", __FUNCTION__, port->number); 241 242 if (serial->num_bulk_out) { 243 if (port->write_urb_busy) 244 chars = port->write_urb->transfer_buffer_length; 245 } 246 247 dbg("%s - returns %d", __FUNCTION__, chars); 248 return (chars); 249 } 250 251 void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs) 252 { 253 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 254 struct usb_serial *serial = port->serial; 255 struct tty_struct *tty; 256 unsigned char *data = urb->transfer_buffer; 257 int i; 258 int result; 259 260 dbg("%s - port %d", __FUNCTION__, port->number); 261 262 if (urb->status) { 263 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status); 264 return; 265 } 266 267 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); 268 269 tty = port->tty; 270 if (tty && urb->actual_length) { 271 for (i = 0; i < urb->actual_length ; ++i) { 272 /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */ 273 if(tty->flip.count >= TTY_FLIPBUF_SIZE) { 274 tty_flip_buffer_push(tty); 275 } 276 /* this doesn't actually push the data through unless tty->low_latency is set */ 277 tty_insert_flip_char(tty, data[i], 0); 278 } 279 tty_flip_buffer_push(tty); 280 } 281 282 /* Continue trying to always read */ 283 usb_fill_bulk_urb (port->read_urb, serial->dev, 284 usb_rcvbulkpipe (serial->dev, 285 port->bulk_in_endpointAddress), 286 port->read_urb->transfer_buffer, 287 port->read_urb->transfer_buffer_length, 288 ((serial->type->read_bulk_callback) ? 289 serial->type->read_bulk_callback : 290 usb_serial_generic_read_bulk_callback), port); 291 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 292 if (result) 293 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); 294 } 295 296 void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs) 297 { 298 struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 299 300 dbg("%s - port %d", __FUNCTION__, port->number); 301 302 port->write_urb_busy = 0; 303 if (urb->status) { 304 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status); 305 return; 306 } 307 308 usb_serial_port_softint((void *)port); 309 310 schedule_work(&port->work); 311 } 312 EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); 313 314 void usb_serial_generic_shutdown (struct usb_serial *serial) 315 { 316 int i; 317 318 dbg("%s", __FUNCTION__); 319 320 /* stop reads and writes on all ports */ 321 for (i=0; i < serial->num_ports; ++i) { 322 generic_cleanup(serial->port[i]); 323 } 324 } 325 326