11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * USB Serial Converter Generic functions 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 71da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License version 81da177e4SLinus Torvalds * 2 as published by the Free Software Foundation. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds */ 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds #include <linux/kernel.h> 131da177e4SLinus Torvalds #include <linux/errno.h> 141da177e4SLinus Torvalds #include <linux/slab.h> 151da177e4SLinus Torvalds #include <linux/tty.h> 161da177e4SLinus Torvalds #include <linux/tty_flip.h> 171da177e4SLinus Torvalds #include <linux/module.h> 181da177e4SLinus Torvalds #include <linux/moduleparam.h> 191da177e4SLinus Torvalds #include <linux/usb.h> 20a969888cSGreg Kroah-Hartman #include <linux/usb/serial.h> 211da177e4SLinus Torvalds #include <asm/uaccess.h> 221da177e4SLinus Torvalds 23d9b1b787SJohannes Hölzl 241da177e4SLinus Torvalds static int debug; 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #ifdef CONFIG_USB_SERIAL_GENERIC 27b46d60fcSDavid Brownell 28b46d60fcSDavid Brownell static int generic_probe(struct usb_interface *interface, 29b46d60fcSDavid Brownell const struct usb_device_id *id); 30b46d60fcSDavid Brownell 311da177e4SLinus Torvalds static __u16 vendor = 0x05f9; 321da177e4SLinus Torvalds static __u16 product = 0xffff; 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds module_param(vendor, ushort, 0); 351da177e4SLinus Torvalds MODULE_PARM_DESC(vendor, "User specified USB idVendor"); 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds module_param(product, ushort, 0); 381da177e4SLinus Torvalds MODULE_PARM_DESC(product, "User specified USB idProduct"); 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ 411da177e4SLinus Torvalds 42d9b1b787SJohannes Hölzl /* we want to look at all devices, as the vendor/product id can change 43d9b1b787SJohannes Hölzl * depending on the command line argument */ 44d9b1b787SJohannes Hölzl static struct usb_device_id generic_serial_ids[] = { 45d9b1b787SJohannes Hölzl {.driver_info = 42}, 46d9b1b787SJohannes Hölzl {} 47d9b1b787SJohannes Hölzl }; 48d9b1b787SJohannes Hölzl 49d9b1b787SJohannes Hölzl static struct usb_driver generic_driver = { 50d9b1b787SJohannes Hölzl .name = "usbserial_generic", 51d9b1b787SJohannes Hölzl .probe = generic_probe, 52d9b1b787SJohannes Hölzl .disconnect = usb_serial_disconnect, 53d9b1b787SJohannes Hölzl .id_table = generic_serial_ids, 54d9b1b787SJohannes Hölzl .no_dynamic_id = 1, 55d9b1b787SJohannes Hölzl }; 56d9b1b787SJohannes Hölzl 571da177e4SLinus Torvalds /* All of the device info needed for the Generic Serial Converter */ 58ea65370dSGreg Kroah-Hartman struct usb_serial_driver usb_serial_generic_device = { 5918fcac35SGreg Kroah-Hartman .driver = { 601da177e4SLinus Torvalds .owner = THIS_MODULE, 61269bda1cSGreg Kroah-Hartman .name = "generic", 6218fcac35SGreg Kroah-Hartman }, 631da177e4SLinus Torvalds .id_table = generic_device_ids, 64d9b1b787SJohannes Hölzl .usb_driver = &generic_driver, 651da177e4SLinus Torvalds .num_interrupt_in = NUM_DONT_CARE, 661da177e4SLinus Torvalds .num_bulk_in = NUM_DONT_CARE, 671da177e4SLinus Torvalds .num_bulk_out = NUM_DONT_CARE, 681da177e4SLinus Torvalds .num_ports = 1, 691da177e4SLinus Torvalds .shutdown = usb_serial_generic_shutdown, 70253ca923SJoris van Rantwijk .throttle = usb_serial_generic_throttle, 71253ca923SJoris van Rantwijk .unthrottle = usb_serial_generic_unthrottle, 72ec22559eSOliver Neukum .resume = usb_serial_generic_resume, 731da177e4SLinus Torvalds }; 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static int generic_probe(struct usb_interface *interface, 761da177e4SLinus Torvalds const struct usb_device_id *id) 771da177e4SLinus Torvalds { 781da177e4SLinus Torvalds const struct usb_device_id *id_pattern; 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds id_pattern = usb_match_id(interface, generic_device_ids); 811da177e4SLinus Torvalds if (id_pattern != NULL) 821da177e4SLinus Torvalds return usb_serial_probe(interface, id); 831da177e4SLinus Torvalds return -ENODEV; 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds #endif 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds int usb_serial_generic_register (int _debug) 881da177e4SLinus Torvalds { 891da177e4SLinus Torvalds int retval = 0; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds debug = _debug; 921da177e4SLinus Torvalds #ifdef CONFIG_USB_SERIAL_GENERIC 931da177e4SLinus Torvalds generic_device_ids[0].idVendor = vendor; 941da177e4SLinus Torvalds generic_device_ids[0].idProduct = product; 951da177e4SLinus Torvalds generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds /* register our generic driver with ourselves */ 981da177e4SLinus Torvalds retval = usb_serial_register (&usb_serial_generic_device); 991da177e4SLinus Torvalds if (retval) 1001da177e4SLinus Torvalds goto exit; 1011da177e4SLinus Torvalds retval = usb_register(&generic_driver); 1021da177e4SLinus Torvalds if (retval) 1031da177e4SLinus Torvalds usb_serial_deregister(&usb_serial_generic_device); 1041da177e4SLinus Torvalds exit: 1051da177e4SLinus Torvalds #endif 1061da177e4SLinus Torvalds return retval; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds void usb_serial_generic_deregister (void) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds #ifdef CONFIG_USB_SERIAL_GENERIC 1121da177e4SLinus Torvalds /* remove our generic driver */ 1131da177e4SLinus Torvalds usb_deregister(&generic_driver); 1141da177e4SLinus Torvalds usb_serial_deregister (&usb_serial_generic_device); 1151da177e4SLinus Torvalds #endif 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds struct usb_serial *serial = port->serial; 1211da177e4SLinus Torvalds int result = 0; 122253ca923SJoris van Rantwijk unsigned long flags; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds dbg("%s - port %d", __FUNCTION__, port->number); 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds /* force low_latency on so that our tty_push actually forces the data through, 1271da177e4SLinus Torvalds otherwise it is scheduled, and with high data rates (like with OHCI) data 1281da177e4SLinus Torvalds can get lost. */ 1291da177e4SLinus Torvalds if (port->tty) 1301da177e4SLinus Torvalds port->tty->low_latency = 1; 1311da177e4SLinus Torvalds 132253ca923SJoris van Rantwijk /* clear the throttle flags */ 133253ca923SJoris van Rantwijk spin_lock_irqsave(&port->lock, flags); 134253ca923SJoris van Rantwijk port->throttled = 0; 135253ca923SJoris van Rantwijk port->throttle_req = 0; 136253ca923SJoris van Rantwijk spin_unlock_irqrestore(&port->lock, flags); 137253ca923SJoris van Rantwijk 138253ca923SJoris van Rantwijk /* if we have a bulk endpoint, start reading from it */ 1391da177e4SLinus Torvalds if (serial->num_bulk_in) { 1401da177e4SLinus Torvalds /* Start reading from the device */ 1411da177e4SLinus Torvalds usb_fill_bulk_urb (port->read_urb, serial->dev, 1421da177e4SLinus Torvalds usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), 1431da177e4SLinus Torvalds port->read_urb->transfer_buffer, 1441da177e4SLinus Torvalds port->read_urb->transfer_buffer_length, 1451da177e4SLinus Torvalds ((serial->type->read_bulk_callback) ? 1461da177e4SLinus Torvalds serial->type->read_bulk_callback : 1471da177e4SLinus Torvalds usb_serial_generic_read_bulk_callback), 1481da177e4SLinus Torvalds port); 1491da177e4SLinus Torvalds result = usb_submit_urb(port->read_urb, GFP_KERNEL); 1501da177e4SLinus Torvalds if (result) 1511da177e4SLinus Torvalds dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds return result; 1551da177e4SLinus Torvalds } 156815ddc99SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_serial_generic_open); 1571da177e4SLinus Torvalds 1581da177e4SLinus Torvalds static void generic_cleanup (struct usb_serial_port *port) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds struct usb_serial *serial = port->serial; 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds dbg("%s - port %d", __FUNCTION__, port->number); 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds if (serial->dev) { 1651da177e4SLinus Torvalds /* shutdown any bulk reads that might be going on */ 1661da177e4SLinus Torvalds if (serial->num_bulk_out) 1671da177e4SLinus Torvalds usb_kill_urb(port->write_urb); 1681da177e4SLinus Torvalds if (serial->num_bulk_in) 1691da177e4SLinus Torvalds usb_kill_urb(port->read_urb); 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds } 1721da177e4SLinus Torvalds 173ec22559eSOliver Neukum int usb_serial_generic_resume(struct usb_serial *serial) 174ec22559eSOliver Neukum { 175ec22559eSOliver Neukum struct usb_serial_port *port; 176ec22559eSOliver Neukum int i, c = 0, r; 177ec22559eSOliver Neukum 178f0fbd5b9SSarah Sharp #ifdef CONFIG_PM 179f0fbd5b9SSarah Sharp /* 180f0fbd5b9SSarah Sharp * If this is an autoresume, don't submit URBs. 181f0fbd5b9SSarah Sharp * They will be submitted in the open function instead. 182f0fbd5b9SSarah Sharp */ 183f0fbd5b9SSarah Sharp if (serial->dev->auto_pm) 184f0fbd5b9SSarah Sharp return 0; 185f0fbd5b9SSarah Sharp #endif 186ec22559eSOliver Neukum for (i = 0; i < serial->num_ports; i++) { 187ec22559eSOliver Neukum port = serial->port[i]; 188ec22559eSOliver Neukum if (port->open_count && port->read_urb) { 189ec22559eSOliver Neukum r = usb_submit_urb(port->read_urb, GFP_NOIO); 190ec22559eSOliver Neukum if (r < 0) 191ec22559eSOliver Neukum c++; 192ec22559eSOliver Neukum } 193ec22559eSOliver Neukum } 194ec22559eSOliver Neukum 195ec22559eSOliver Neukum return c ? -EIO : 0; 196ec22559eSOliver Neukum } 197ec22559eSOliver Neukum 1981da177e4SLinus Torvalds void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp) 1991da177e4SLinus Torvalds { 2001da177e4SLinus Torvalds dbg("%s - port %d", __FUNCTION__, port->number); 2011da177e4SLinus Torvalds generic_cleanup (port); 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds 2041da177e4SLinus Torvalds int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *buf, int count) 2051da177e4SLinus Torvalds { 2061da177e4SLinus Torvalds struct usb_serial *serial = port->serial; 2071da177e4SLinus Torvalds int result; 2081da177e4SLinus Torvalds unsigned char *data; 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvalds dbg("%s - port %d", __FUNCTION__, port->number); 2111da177e4SLinus Torvalds 2121da177e4SLinus Torvalds if (count == 0) { 2131da177e4SLinus Torvalds dbg("%s - write request of 0 bytes", __FUNCTION__); 2141da177e4SLinus Torvalds return (0); 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds /* only do something if we have a bulk out endpoint */ 2181da177e4SLinus Torvalds if (serial->num_bulk_out) { 219acd2a847SJiri Kosina unsigned long flags; 220acd2a847SJiri Kosina spin_lock_irqsave(&port->lock, flags); 221507ca9bcSGreg Kroah-Hartman if (port->write_urb_busy) { 222acd2a847SJiri Kosina spin_unlock_irqrestore(&port->lock, flags); 2231da177e4SLinus Torvalds dbg("%s - already writing", __FUNCTION__); 224507ca9bcSGreg Kroah-Hartman return 0; 2251da177e4SLinus Torvalds } 226507ca9bcSGreg Kroah-Hartman port->write_urb_busy = 1; 227acd2a847SJiri Kosina spin_unlock_irqrestore(&port->lock, flags); 2281da177e4SLinus Torvalds 2291da177e4SLinus Torvalds count = (count > port->bulk_out_size) ? port->bulk_out_size : count; 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds memcpy (port->write_urb->transfer_buffer, buf, count); 2321da177e4SLinus Torvalds data = port->write_urb->transfer_buffer; 2331da177e4SLinus Torvalds usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data); 2341da177e4SLinus Torvalds 2351da177e4SLinus Torvalds /* set up our urb */ 2361da177e4SLinus Torvalds usb_fill_bulk_urb (port->write_urb, serial->dev, 2371da177e4SLinus Torvalds usb_sndbulkpipe (serial->dev, 2381da177e4SLinus Torvalds port->bulk_out_endpointAddress), 2391da177e4SLinus Torvalds port->write_urb->transfer_buffer, count, 2401da177e4SLinus Torvalds ((serial->type->write_bulk_callback) ? 2411da177e4SLinus Torvalds serial->type->write_bulk_callback : 2421da177e4SLinus Torvalds usb_serial_generic_write_bulk_callback), port); 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds /* send the data out the bulk port */ 245507ca9bcSGreg Kroah-Hartman port->write_urb_busy = 1; 2461da177e4SLinus Torvalds result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 247507ca9bcSGreg Kroah-Hartman if (result) { 2481da177e4SLinus Torvalds dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result); 249507ca9bcSGreg Kroah-Hartman /* don't have to grab the lock here, as we will retry if != 0 */ 250507ca9bcSGreg Kroah-Hartman port->write_urb_busy = 0; 251507ca9bcSGreg Kroah-Hartman } else 2521da177e4SLinus Torvalds result = count; 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds return result; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds /* no bulk out, so return 0 bytes written */ 258507ca9bcSGreg Kroah-Hartman return 0; 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds int usb_serial_generic_write_room (struct usb_serial_port *port) 2621da177e4SLinus Torvalds { 2631da177e4SLinus Torvalds struct usb_serial *serial = port->serial; 2641da177e4SLinus Torvalds int room = 0; 2651da177e4SLinus Torvalds 2661da177e4SLinus Torvalds dbg("%s - port %d", __FUNCTION__, port->number); 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds if (serial->num_bulk_out) { 2697a3ca7d2SRandall Nortman if (!(port->write_urb_busy)) 2701da177e4SLinus Torvalds room = port->bulk_out_size; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds dbg("%s - returns %d", __FUNCTION__, room); 2741da177e4SLinus Torvalds return (room); 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds struct usb_serial *serial = port->serial; 2801da177e4SLinus Torvalds int chars = 0; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds dbg("%s - port %d", __FUNCTION__, port->number); 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds if (serial->num_bulk_out) { 285507ca9bcSGreg Kroah-Hartman if (port->write_urb_busy) 2861da177e4SLinus Torvalds chars = port->write_urb->transfer_buffer_length; 2871da177e4SLinus Torvalds } 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvalds dbg("%s - returns %d", __FUNCTION__, chars); 2901da177e4SLinus Torvalds return (chars); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds 2931abdeeb1SOliver Neukum 2941abdeeb1SOliver Neukum static void resubmit_read_urb(struct usb_serial_port *port, gfp_t mem_flags) 2951da177e4SLinus Torvalds { 296253ca923SJoris van Rantwijk struct urb *urb = port->read_urb; 2971abdeeb1SOliver Neukum struct usb_serial *serial = port->serial; 2981da177e4SLinus Torvalds int result; 2991da177e4SLinus Torvalds 300253ca923SJoris van Rantwijk /* Continue reading from device */ 3011abdeeb1SOliver Neukum usb_fill_bulk_urb (urb, serial->dev, 3021da177e4SLinus Torvalds usb_rcvbulkpipe (serial->dev, 3031da177e4SLinus Torvalds port->bulk_in_endpointAddress), 3041abdeeb1SOliver Neukum urb->transfer_buffer, 3051abdeeb1SOliver Neukum urb->transfer_buffer_length, 3061da177e4SLinus Torvalds ((serial->type->read_bulk_callback) ? 3071da177e4SLinus Torvalds serial->type->read_bulk_callback : 3081da177e4SLinus Torvalds usb_serial_generic_read_bulk_callback), port); 3091abdeeb1SOliver Neukum result = usb_submit_urb(urb, mem_flags); 3101da177e4SLinus Torvalds if (result) 3111da177e4SLinus Torvalds dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); 3121da177e4SLinus Torvalds } 313253ca923SJoris van Rantwijk 3141abdeeb1SOliver Neukum /* Push data to tty layer and resubmit the bulk read URB */ 3151abdeeb1SOliver Neukum static void flush_and_resubmit_read_urb (struct usb_serial_port *port) 3161abdeeb1SOliver Neukum { 3171abdeeb1SOliver Neukum struct urb *urb = port->read_urb; 3181abdeeb1SOliver Neukum struct tty_struct *tty = port->tty; 3191abdeeb1SOliver Neukum int room; 3201abdeeb1SOliver Neukum 3211abdeeb1SOliver Neukum /* Push data to tty */ 3221abdeeb1SOliver Neukum if (tty && urb->actual_length) { 3231abdeeb1SOliver Neukum room = tty_buffer_request_room(tty, urb->actual_length); 3241abdeeb1SOliver Neukum if (room) { 3251abdeeb1SOliver Neukum tty_insert_flip_string(tty, urb->transfer_buffer, room); 326b507cc97SPete Zaitcev tty_flip_buffer_push(tty); 3271abdeeb1SOliver Neukum } 3281abdeeb1SOliver Neukum } 3291abdeeb1SOliver Neukum 3301abdeeb1SOliver Neukum resubmit_read_urb(port, GFP_ATOMIC); 3311abdeeb1SOliver Neukum } 3321abdeeb1SOliver Neukum 333253ca923SJoris van Rantwijk void usb_serial_generic_read_bulk_callback (struct urb *urb) 334253ca923SJoris van Rantwijk { 335253ca923SJoris van Rantwijk struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 336253ca923SJoris van Rantwijk unsigned char *data = urb->transfer_buffer; 337fbd27225SGreg Kroah-Hartman int status = urb->status; 338bfaeafcfSBorislav Petkov unsigned long flags; 339253ca923SJoris van Rantwijk 340253ca923SJoris van Rantwijk dbg("%s - port %d", __FUNCTION__, port->number); 341253ca923SJoris van Rantwijk 342fbd27225SGreg Kroah-Hartman if (unlikely(status != 0)) { 343fbd27225SGreg Kroah-Hartman dbg("%s - nonzero read bulk status received: %d", 344fbd27225SGreg Kroah-Hartman __FUNCTION__, status); 345253ca923SJoris van Rantwijk return; 346253ca923SJoris van Rantwijk } 347253ca923SJoris van Rantwijk 348253ca923SJoris van Rantwijk usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); 349253ca923SJoris van Rantwijk 350253ca923SJoris van Rantwijk /* Throttle the device if requested by tty */ 351bfaeafcfSBorislav Petkov spin_lock_irqsave(&port->lock, flags); 352b507cc97SPete Zaitcev if (!(port->throttled = port->throttle_req)) { 353bfaeafcfSBorislav Petkov spin_unlock_irqrestore(&port->lock, flags); 354b507cc97SPete Zaitcev flush_and_resubmit_read_urb(port); 355b507cc97SPete Zaitcev } else { 356b507cc97SPete Zaitcev spin_unlock_irqrestore(&port->lock, flags); 357b507cc97SPete Zaitcev } 358253ca923SJoris van Rantwijk } 359166ffccfSLuiz Fernando N. Capitulino EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); 3601da177e4SLinus Torvalds 3617d12e780SDavid Howells void usb_serial_generic_write_bulk_callback (struct urb *urb) 3621da177e4SLinus Torvalds { 3631da177e4SLinus Torvalds struct usb_serial_port *port = (struct usb_serial_port *)urb->context; 364fbd27225SGreg Kroah-Hartman int status = urb->status; 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvalds dbg("%s - port %d", __FUNCTION__, port->number); 3671da177e4SLinus Torvalds 368507ca9bcSGreg Kroah-Hartman port->write_urb_busy = 0; 369fbd27225SGreg Kroah-Hartman if (status) { 370fbd27225SGreg Kroah-Hartman dbg("%s - nonzero write bulk status received: %d", 371fbd27225SGreg Kroah-Hartman __FUNCTION__, status); 3721da177e4SLinus Torvalds return; 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 375cf2c7481SPete Zaitcev usb_serial_port_softint(port); 3761da177e4SLinus Torvalds } 377bb833986SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); 3781da177e4SLinus Torvalds 379253ca923SJoris van Rantwijk void usb_serial_generic_throttle (struct usb_serial_port *port) 380253ca923SJoris van Rantwijk { 381253ca923SJoris van Rantwijk unsigned long flags; 382253ca923SJoris van Rantwijk 383253ca923SJoris van Rantwijk dbg("%s - port %d", __FUNCTION__, port->number); 384253ca923SJoris van Rantwijk 385253ca923SJoris van Rantwijk /* Set the throttle request flag. It will be picked up 386253ca923SJoris van Rantwijk * by usb_serial_generic_read_bulk_callback(). */ 387253ca923SJoris van Rantwijk spin_lock_irqsave(&port->lock, flags); 388253ca923SJoris van Rantwijk port->throttle_req = 1; 389253ca923SJoris van Rantwijk spin_unlock_irqrestore(&port->lock, flags); 390253ca923SJoris van Rantwijk } 391253ca923SJoris van Rantwijk 392253ca923SJoris van Rantwijk void usb_serial_generic_unthrottle (struct usb_serial_port *port) 393253ca923SJoris van Rantwijk { 394253ca923SJoris van Rantwijk int was_throttled; 395253ca923SJoris van Rantwijk unsigned long flags; 396253ca923SJoris van Rantwijk 397253ca923SJoris van Rantwijk dbg("%s - port %d", __FUNCTION__, port->number); 398253ca923SJoris van Rantwijk 399253ca923SJoris van Rantwijk /* Clear the throttle flags */ 400253ca923SJoris van Rantwijk spin_lock_irqsave(&port->lock, flags); 401253ca923SJoris van Rantwijk was_throttled = port->throttled; 402253ca923SJoris van Rantwijk port->throttled = port->throttle_req = 0; 403253ca923SJoris van Rantwijk spin_unlock_irqrestore(&port->lock, flags); 404253ca923SJoris van Rantwijk 405253ca923SJoris van Rantwijk if (was_throttled) { 4061abdeeb1SOliver Neukum /* Resume reading from device */ 4071abdeeb1SOliver Neukum resubmit_read_urb(port, GFP_KERNEL); 408253ca923SJoris van Rantwijk } 409253ca923SJoris van Rantwijk } 410253ca923SJoris van Rantwijk 4111da177e4SLinus Torvalds void usb_serial_generic_shutdown (struct usb_serial *serial) 4121da177e4SLinus Torvalds { 4131da177e4SLinus Torvalds int i; 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds dbg("%s", __FUNCTION__); 4161da177e4SLinus Torvalds 4171da177e4SLinus Torvalds /* stop reads and writes on all ports */ 4181da177e4SLinus Torvalds for (i=0; i < serial->num_ports; ++i) { 4191da177e4SLinus Torvalds generic_cleanup(serial->port[i]); 4201da177e4SLinus Torvalds } 4211da177e4SLinus Torvalds } 4221da177e4SLinus Torvalds 423