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