Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * USB Serial Converter Generic functions |
| 3 | * |
Johan Hovold | 659597b | 2013-03-21 12:37:51 +0100 | [diff] [blame] | 4 | * Copyright (C) 2010 - 2013 Johan Hovold (jhovold@gmail.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License version |
| 9 | * 2 as published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/slab.h> |
Randy Dunlap | 7f0ae3a | 2010-03-25 11:29:16 -0700 | [diff] [blame] | 15 | #include <linux/sysrq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Greg Kroah-Hartman | a969888 | 2006-07-11 21:22:58 -0700 | [diff] [blame] | 21 | #include <linux/usb/serial.h> |
Alan Cox | ae64387 | 2008-07-22 11:11:55 +0100 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 23 | #include <linux/kfifo.h> |
Alan Stern | 1f87158 | 2010-02-17 10:05:47 -0500 | [diff] [blame] | 24 | #include <linux/serial.h> |
Johannes Hölzl | d9b1b78 | 2006-12-17 21:50:24 +0100 | [diff] [blame] | 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #ifdef CONFIG_USB_SERIAL_GENERIC |
David Brownell | b46d60f | 2007-03-23 12:51:55 -0700 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | static __u16 vendor = 0x05f9; |
| 29 | static __u16 product = 0xffff; |
| 30 | |
| 31 | module_param(vendor, ushort, 0); |
| 32 | MODULE_PARM_DESC(vendor, "User specified USB idVendor"); |
| 33 | |
| 34 | module_param(product, ushort, 0); |
| 35 | MODULE_PARM_DESC(product, "User specified USB idProduct"); |
| 36 | |
| 37 | static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ |
| 38 | |
Greg Kroah-Hartman | ea65370 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 39 | struct usb_serial_driver usb_serial_generic_device = { |
Greg Kroah-Hartman | 18fcac3 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 40 | .driver = { |
| 41 | .owner = THIS_MODULE, |
Greg Kroah-Hartman | 269bda1 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 42 | .name = "generic", |
Greg Kroah-Hartman | 18fcac3 | 2005-06-20 21:15:16 -0700 | [diff] [blame] | 43 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | .id_table = generic_device_ids, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | .num_ports = 1, |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 46 | .throttle = usb_serial_generic_throttle, |
| 47 | .unthrottle = usb_serial_generic_unthrottle, |
Oliver Neukum | ec22559 | 2007-04-27 20:54:57 +0200 | [diff] [blame] | 48 | .resume = usb_serial_generic_resume, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | }; |
| 50 | |
Alan Stern | 765e0ba | 2012-02-23 14:55:59 -0500 | [diff] [blame] | 51 | static struct usb_serial_driver * const serial_drivers[] = { |
| 52 | &usb_serial_generic_device, NULL |
| 53 | }; |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #endif |
| 56 | |
Greg Kroah-Hartman | 3033bc8 | 2012-09-18 16:05:17 +0100 | [diff] [blame] | 57 | int usb_serial_generic_register(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | { |
| 59 | int retval = 0; |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #ifdef CONFIG_USB_SERIAL_GENERIC |
| 62 | generic_device_ids[0].idVendor = vendor; |
| 63 | generic_device_ids[0].idProduct = product; |
Alan Cox | ae64387 | 2008-07-22 11:11:55 +0100 | [diff] [blame] | 64 | generic_device_ids[0].match_flags = |
| 65 | USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Alan Stern | 0b84704 | 2012-05-31 17:03:52 -0400 | [diff] [blame] | 67 | retval = usb_serial_register_drivers(serial_drivers, |
| 68 | "usbserial_generic", generic_device_ids); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | #endif |
| 70 | return retval; |
| 71 | } |
| 72 | |
Alan Cox | ae64387 | 2008-07-22 11:11:55 +0100 | [diff] [blame] | 73 | void usb_serial_generic_deregister(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
| 75 | #ifdef CONFIG_USB_SERIAL_GENERIC |
Greg Kroah-Hartman | 68e2411 | 2012-05-08 15:46:14 -0700 | [diff] [blame] | 76 | usb_serial_deregister_drivers(serial_drivers); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | #endif |
| 78 | } |
| 79 | |
Alan Cox | a509a7e | 2009-09-19 13:13:26 -0700 | [diff] [blame] | 80 | int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | int result = 0; |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 83 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 85 | spin_lock_irqsave(&port->lock, flags); |
| 86 | port->throttled = 0; |
| 87 | port->throttle_req = 0; |
| 88 | spin_unlock_irqrestore(&port->lock, flags); |
| 89 | |
Johan Hovold | 41bd72f | 2010-03-17 23:05:53 +0100 | [diff] [blame] | 90 | if (port->bulk_in_size) |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 91 | result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
| 93 | return result; |
| 94 | } |
Greg Kroah-Hartman | 815ddc9 | 2006-05-12 11:05:29 -0700 | [diff] [blame] | 95 | EXPORT_SYMBOL_GPL(usb_serial_generic_open); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Johan Hovold | f8f0ad8 | 2013-03-21 12:36:41 +0100 | [diff] [blame] | 97 | void usb_serial_generic_close(struct usb_serial_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Johan Hovold | ec3ee50 | 2010-03-17 23:00:44 +0100 | [diff] [blame] | 99 | unsigned long flags; |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 100 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
Johan Hovold | 19c6185 | 2013-03-21 12:36:38 +0100 | [diff] [blame] | 102 | if (port->bulk_out_size) { |
| 103 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) |
| 104 | usb_kill_urb(port->write_urbs[i]); |
Johan Hovold | ec3ee50 | 2010-03-17 23:00:44 +0100 | [diff] [blame] | 105 | |
Johan Hovold | 19c6185 | 2013-03-21 12:36:38 +0100 | [diff] [blame] | 106 | spin_lock_irqsave(&port->lock, flags); |
| 107 | kfifo_reset_out(&port->write_fifo); |
| 108 | spin_unlock_irqrestore(&port->lock, flags); |
| 109 | } |
| 110 | if (port->bulk_in_size) { |
| 111 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) |
| 112 | usb_kill_urb(port->read_urbs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | } |
Johan Hovold | f26788d | 2010-03-17 23:00:45 +0100 | [diff] [blame] | 115 | EXPORT_SYMBOL_GPL(usb_serial_generic_close); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Johan Hovold | eaa3bcb | 2010-03-17 23:06:08 +0100 | [diff] [blame] | 117 | int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 118 | void *dest, size_t size) |
Johan Hovold | eaa3bcb | 2010-03-17 23:06:08 +0100 | [diff] [blame] | 119 | { |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 120 | return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock); |
Jason Wessel | 715b1dc | 2009-05-11 15:24:07 -0500 | [diff] [blame] | 121 | } |
| 122 | |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 123 | /** |
Johan Hovold | 92ad247 | 2013-10-09 17:01:10 +0200 | [diff] [blame] | 124 | * usb_serial_generic_write_start - start writing buffered data |
| 125 | * @port: usb-serial port |
Johan Hovold | 818f603 | 2013-10-09 17:01:11 +0200 | [diff] [blame] | 126 | * @mem_flags: flags to use for memory allocations |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 127 | * |
Johan Hovold | 92ad247 | 2013-10-09 17:01:10 +0200 | [diff] [blame] | 128 | * Serialised using USB_SERIAL_WRITE_BUSY flag. |
| 129 | * |
| 130 | * Return: Zero on success or if busy, otherwise a negative errno value. |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 131 | */ |
Johan Hovold | 706cd17 | 2013-10-09 17:01:12 +0200 | [diff] [blame] | 132 | int usb_serial_generic_write_start(struct usb_serial_port *port, |
Johan Hovold | 818f603 | 2013-10-09 17:01:11 +0200 | [diff] [blame] | 133 | gfp_t mem_flags) |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 134 | { |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 135 | struct urb *urb; |
| 136 | int count, result; |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 137 | unsigned long flags; |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 138 | int i; |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 139 | |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 140 | if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags)) |
| 141 | return 0; |
| 142 | retry: |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 143 | spin_lock_irqsave(&port->lock, flags); |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 144 | if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) { |
| 145 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); |
Johan Hovold | 50a5f70 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 146 | spin_unlock_irqrestore(&port->lock, flags); |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 147 | return 0; |
Johan Hovold | 50a5f70 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 148 | } |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 149 | i = (int)find_first_bit(&port->write_urbs_free, |
| 150 | ARRAY_SIZE(port->write_urbs)); |
Johan Hovold | 50a5f70 | 2010-03-17 23:06:02 +0100 | [diff] [blame] | 151 | spin_unlock_irqrestore(&port->lock, flags); |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 152 | |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 153 | urb = port->write_urbs[i]; |
Johan Hovold | eaa3bcb | 2010-03-17 23:06:08 +0100 | [diff] [blame] | 154 | count = port->serial->type->prepare_write_buffer(port, |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 155 | urb->transfer_buffer, |
| 156 | port->bulk_out_size); |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 157 | urb->transfer_buffer_length = count; |
Greg Kroah-Hartman | 59d33f2 | 2012-09-18 09:58:57 +0100 | [diff] [blame] | 158 | usb_serial_debug_data(&port->dev, __func__, count, urb->transfer_buffer); |
Johan Hovold | b58af40 | 2010-08-04 15:45:57 +0200 | [diff] [blame] | 159 | spin_lock_irqsave(&port->lock, flags); |
| 160 | port->tx_bytes += count; |
| 161 | spin_unlock_irqrestore(&port->lock, flags); |
| 162 | |
| 163 | clear_bit(i, &port->write_urbs_free); |
Johan Hovold | 818f603 | 2013-10-09 17:01:11 +0200 | [diff] [blame] | 164 | result = usb_submit_urb(urb, mem_flags); |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 165 | if (result) { |
Johan Hovold | f1475a0 | 2012-02-10 13:20:50 +0100 | [diff] [blame] | 166 | dev_err_console(port, "%s - error submitting urb: %d\n", |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 167 | __func__, result); |
Johan Hovold | b58af40 | 2010-08-04 15:45:57 +0200 | [diff] [blame] | 168 | set_bit(i, &port->write_urbs_free); |
| 169 | spin_lock_irqsave(&port->lock, flags); |
| 170 | port->tx_bytes -= count; |
| 171 | spin_unlock_irqrestore(&port->lock, flags); |
| 172 | |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 173 | clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); |
Johan Hovold | 30af7fb | 2010-03-17 23:00:42 +0100 | [diff] [blame] | 174 | return result; |
| 175 | } |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 176 | |
Johan Hovold | 6f64854 | 2013-11-09 12:38:09 +0100 | [diff] [blame] | 177 | goto retry; /* try sending off another urb */ |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 178 | } |
Johan Hovold | 706cd17 | 2013-10-09 17:01:12 +0200 | [diff] [blame] | 179 | EXPORT_SYMBOL_GPL(usb_serial_generic_write_start); |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 180 | |
| 181 | /** |
Johan Hovold | 92ad247 | 2013-10-09 17:01:10 +0200 | [diff] [blame] | 182 | * usb_serial_generic_write - generic write function |
| 183 | * @tty: tty for the port |
| 184 | * @port: usb-serial port |
| 185 | * @buf: data to write |
| 186 | * @count: number of bytes to write |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 187 | * |
Johan Hovold | 92ad247 | 2013-10-09 17:01:10 +0200 | [diff] [blame] | 188 | * Return: The number of characters buffered, which may be anything from |
| 189 | * zero to @count, or a negative errno value. |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 190 | */ |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 191 | int usb_serial_generic_write(struct tty_struct *tty, |
| 192 | struct usb_serial_port *port, const unsigned char *buf, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
Johan Hovold | eb8878a | 2010-02-27 16:24:49 +0100 | [diff] [blame] | 196 | if (!port->bulk_out_size) |
| 197 | return -ENODEV; |
| 198 | |
Johan Hovold | 1a1405e | 2010-03-17 23:06:01 +0100 | [diff] [blame] | 199 | if (!count) |
Alan Cox | ae64387 | 2008-07-22 11:11:55 +0100 | [diff] [blame] | 200 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
Stefani Seibold | 119eecc | 2009-12-23 09:10:48 +0100 | [diff] [blame] | 202 | count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); |
Johan Hovold | 043e3f8 | 2013-11-09 12:38:10 +0100 | [diff] [blame] | 203 | result = usb_serial_generic_write_start(port, GFP_ATOMIC); |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 204 | if (result) |
| 205 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 207 | return count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } |
Jason Wessel | 98fcb5f | 2009-05-11 15:24:09 -0500 | [diff] [blame] | 209 | EXPORT_SYMBOL_GPL(usb_serial_generic_write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Alan Cox | ae64387 | 2008-07-22 11:11:55 +0100 | [diff] [blame] | 211 | int usb_serial_generic_write_room(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | { |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 213 | struct usb_serial_port *port = tty->driver_data; |
Jason Wessel | 715b1dc | 2009-05-11 15:24:07 -0500 | [diff] [blame] | 214 | unsigned long flags; |
Johan Hovold | 25d514c | 2010-03-17 23:06:07 +0100 | [diff] [blame] | 215 | int room; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | |
Johan Hovold | eb8878a | 2010-02-27 16:24:49 +0100 | [diff] [blame] | 217 | if (!port->bulk_out_size) |
| 218 | return 0; |
| 219 | |
Jason Wessel | 715b1dc | 2009-05-11 15:24:07 -0500 | [diff] [blame] | 220 | spin_lock_irqsave(&port->lock, flags); |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 221 | room = kfifo_avail(&port->write_fifo); |
Jason Wessel | 715b1dc | 2009-05-11 15:24:07 -0500 | [diff] [blame] | 222 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | |
Greg Kroah-Hartman | 689c278 | 2012-05-15 16:27:18 -0700 | [diff] [blame] | 224 | dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); |
Alan Cox | a5b6f60 | 2008-04-08 17:16:06 +0100 | [diff] [blame] | 225 | return room; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } |
| 227 | |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 228 | int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | { |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 230 | struct usb_serial_port *port = tty->driver_data; |
Jason Wessel | 715b1dc | 2009-05-11 15:24:07 -0500 | [diff] [blame] | 231 | unsigned long flags; |
Johan Hovold | eb8878a | 2010-02-27 16:24:49 +0100 | [diff] [blame] | 232 | int chars; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Johan Hovold | eb8878a | 2010-02-27 16:24:49 +0100 | [diff] [blame] | 234 | if (!port->bulk_out_size) |
| 235 | return 0; |
| 236 | |
Stefani Seibold | 25719e6b | 2010-01-05 14:30:31 +0100 | [diff] [blame] | 237 | spin_lock_irqsave(&port->lock, flags); |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 238 | chars = kfifo_len(&port->write_fifo) + port->tx_bytes; |
Stefani Seibold | 25719e6b | 2010-01-05 14:30:31 +0100 | [diff] [blame] | 239 | spin_unlock_irqrestore(&port->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
Greg Kroah-Hartman | 689c278 | 2012-05-15 16:27:18 -0700 | [diff] [blame] | 241 | dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 242 | return chars; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
Johan Hovold | 428d998 | 2012-10-29 10:56:25 +0100 | [diff] [blame] | 244 | EXPORT_SYMBOL_GPL(usb_serial_generic_chars_in_buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Johan Hovold | dcf0105 | 2013-05-08 17:51:43 +0200 | [diff] [blame] | 246 | void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout) |
| 247 | { |
| 248 | struct usb_serial_port *port = tty->driver_data; |
| 249 | unsigned int bps; |
| 250 | unsigned long period; |
| 251 | unsigned long expire; |
| 252 | |
| 253 | bps = tty_get_baud_rate(tty); |
| 254 | if (!bps) |
| 255 | bps = 9600; /* B0 */ |
| 256 | /* |
| 257 | * Use a poll-period of roughly the time it takes to send one |
| 258 | * character or at least one jiffy. |
| 259 | */ |
| 260 | period = max_t(unsigned long, (10 * HZ / bps), 1); |
Johan Hovold | f528bf4 | 2015-03-04 10:39:05 +0100 | [diff] [blame] | 261 | if (timeout) |
| 262 | period = min_t(unsigned long, period, timeout); |
Johan Hovold | dcf0105 | 2013-05-08 17:51:43 +0200 | [diff] [blame] | 263 | |
| 264 | dev_dbg(&port->dev, "%s - timeout = %u ms, period = %u ms\n", |
| 265 | __func__, jiffies_to_msecs(timeout), |
| 266 | jiffies_to_msecs(period)); |
| 267 | expire = jiffies + timeout; |
| 268 | while (!port->serial->type->tx_empty(port)) { |
| 269 | schedule_timeout_interruptible(period); |
| 270 | if (signal_pending(current)) |
| 271 | break; |
Johan Hovold | f528bf4 | 2015-03-04 10:39:05 +0100 | [diff] [blame] | 272 | if (timeout && time_after(jiffies, expire)) |
Johan Hovold | dcf0105 | 2013-05-08 17:51:43 +0200 | [diff] [blame] | 273 | break; |
| 274 | } |
| 275 | } |
| 276 | EXPORT_SYMBOL_GPL(usb_serial_generic_wait_until_sent); |
| 277 | |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 278 | static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port, |
| 279 | int index, gfp_t mem_flags) |
| 280 | { |
| 281 | int res; |
| 282 | |
| 283 | if (!test_and_clear_bit(index, &port->read_urbs_free)) |
| 284 | return 0; |
| 285 | |
Johan Hovold | 49bd196 | 2013-03-21 12:36:27 +0100 | [diff] [blame] | 286 | dev_dbg(&port->dev, "%s - urb %d\n", __func__, index); |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 287 | |
| 288 | res = usb_submit_urb(port->read_urbs[index], mem_flags); |
| 289 | if (res) { |
Jeremiah Mahler | 04f9c6e | 2015-01-11 05:42:07 -0800 | [diff] [blame] | 290 | if (res != -EPERM && res != -ENODEV) { |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 291 | dev_err(&port->dev, |
| 292 | "%s - usb_submit_urb failed: %d\n", |
| 293 | __func__, res); |
| 294 | } |
| 295 | set_bit(index, &port->read_urbs_free); |
| 296 | return res; |
| 297 | } |
| 298 | |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port, |
Johan Hovold | 41bd72f | 2010-03-17 23:05:53 +0100 | [diff] [blame] | 303 | gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 305 | int res; |
| 306 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 308 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { |
| 309 | res = usb_serial_generic_submit_read_urb(port, i, mem_flags); |
| 310 | if (res) |
| 311 | goto err; |
Johan Hovold | 0ae1474 | 2010-02-27 14:05:46 +0100 | [diff] [blame] | 312 | } |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 313 | |
| 314 | return 0; |
| 315 | err: |
| 316 | for (; i >= 0; --i) |
| 317 | usb_kill_urb(port->read_urbs[i]); |
| 318 | |
| 319 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 321 | EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 322 | |
Johan Hovold | 2315432 | 2010-03-17 23:05:57 +0100 | [diff] [blame] | 323 | void usb_serial_generic_process_read_urb(struct urb *urb) |
Oliver Neukum | 1abdeeb | 2007-05-07 12:09:33 +0200 | [diff] [blame] | 324 | { |
Johan Hovold | 0f3d5ba | 2010-03-17 23:05:56 +0100 | [diff] [blame] | 325 | struct usb_serial_port *port = urb->context; |
Jason Wessel | 98fcb5f | 2009-05-11 15:24:09 -0500 | [diff] [blame] | 326 | char *ch = (char *)urb->transfer_buffer; |
| 327 | int i; |
| 328 | |
Johan Hovold | 56a1df4 | 2010-05-15 17:53:44 +0200 | [diff] [blame] | 329 | if (!urb->actual_length) |
| 330 | return; |
Johan Hovold | 92ad247 | 2013-10-09 17:01:10 +0200 | [diff] [blame] | 331 | /* |
| 332 | * The per character mucking around with sysrq path it too slow for |
| 333 | * stuff like 3G modems, so shortcircuit it in the 99.9999999% of |
| 334 | * cases where the USB serial is not a console anyway. |
| 335 | */ |
Johan Hovold | ca0400d | 2014-03-12 19:09:41 +0100 | [diff] [blame] | 336 | if (!port->port.console || !port->sysrq) { |
Jiri Slaby | 05c7cd3 | 2013-01-03 15:53:04 +0100 | [diff] [blame] | 337 | tty_insert_flip_string(&port->port, ch, urb->actual_length); |
Johan Hovold | ca0400d | 2014-03-12 19:09:41 +0100 | [diff] [blame] | 338 | } else { |
Alan Cox | 4cd1de0a | 2009-07-09 13:35:52 +0100 | [diff] [blame] | 339 | for (i = 0; i < urb->actual_length; i++, ch++) { |
Dmitry Torokhov | 6ee9f4b | 2010-08-17 21:15:47 -0700 | [diff] [blame] | 340 | if (!usb_serial_handle_sysrq_char(port, *ch)) |
Jiri Slaby | 92a19f9 | 2013-01-03 15:53:03 +0100 | [diff] [blame] | 341 | tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); |
Alan Cox | 4cd1de0a | 2009-07-09 13:35:52 +0100 | [diff] [blame] | 342 | } |
Oliver Neukum | 1abdeeb | 2007-05-07 12:09:33 +0200 | [diff] [blame] | 343 | } |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 344 | tty_flip_buffer_push(&port->port); |
Oliver Neukum | 1abdeeb | 2007-05-07 12:09:33 +0200 | [diff] [blame] | 345 | } |
Johan Hovold | 2315432 | 2010-03-17 23:05:57 +0100 | [diff] [blame] | 346 | EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb); |
Oliver Neukum | 1abdeeb | 2007-05-07 12:09:33 +0200 | [diff] [blame] | 347 | |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 348 | void usb_serial_generic_read_bulk_callback(struct urb *urb) |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 349 | { |
Ming Lei | cdc9779 | 2008-02-24 18:41:47 +0800 | [diff] [blame] | 350 | struct usb_serial_port *port = urb->context; |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 351 | unsigned char *data = urb->transfer_buffer; |
Borislav Petkov | bfaeafc | 2007-10-28 13:24:16 +0100 | [diff] [blame] | 352 | unsigned long flags; |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 353 | int i; |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 354 | |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 355 | for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { |
| 356 | if (urb == port->read_urbs[i]) |
| 357 | break; |
| 358 | } |
| 359 | set_bit(i, &port->read_urbs_free); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 360 | |
Johan Hovold | 49bd196 | 2013-03-21 12:36:27 +0100 | [diff] [blame] | 361 | dev_dbg(&port->dev, "%s - urb %d, len %d\n", __func__, i, |
| 362 | urb->actual_length); |
Johan Hovold | fc11efe | 2014-03-12 19:09:39 +0100 | [diff] [blame] | 363 | switch (urb->status) { |
| 364 | case 0: |
| 365 | break; |
| 366 | case -ENOENT: |
| 367 | case -ECONNRESET: |
| 368 | case -ESHUTDOWN: |
| 369 | dev_dbg(&port->dev, "%s - urb stopped: %d\n", |
| 370 | __func__, urb->status); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 371 | return; |
Johan Hovold | fc11efe | 2014-03-12 19:09:39 +0100 | [diff] [blame] | 372 | case -EPIPE: |
| 373 | dev_err(&port->dev, "%s - urb stopped: %d\n", |
| 374 | __func__, urb->status); |
| 375 | return; |
| 376 | default: |
Jeremiah Mahler | aa8e221 | 2015-01-11 05:42:06 -0800 | [diff] [blame] | 377 | dev_dbg(&port->dev, "%s - nonzero urb status: %d\n", |
Johan Hovold | fc11efe | 2014-03-12 19:09:39 +0100 | [diff] [blame] | 378 | __func__, urb->status); |
| 379 | goto resubmit; |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 380 | } |
| 381 | |
Greg Kroah-Hartman | 59d33f2 | 2012-09-18 09:58:57 +0100 | [diff] [blame] | 382 | usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
Johan Hovold | 2315432 | 2010-03-17 23:05:57 +0100 | [diff] [blame] | 383 | port->serial->type->process_read_urb(urb); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 384 | |
Johan Hovold | fc11efe | 2014-03-12 19:09:39 +0100 | [diff] [blame] | 385 | resubmit: |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 386 | /* Throttle the device if requested by tty */ |
Borislav Petkov | bfaeafc | 2007-10-28 13:24:16 +0100 | [diff] [blame] | 387 | spin_lock_irqsave(&port->lock, flags); |
Alan Cox | ae64387 | 2008-07-22 11:11:55 +0100 | [diff] [blame] | 388 | port->throttled = port->throttle_req; |
| 389 | if (!port->throttled) { |
Pete Zaitcev | b507cc9 | 2008-03-04 23:28:42 -0800 | [diff] [blame] | 390 | spin_unlock_irqrestore(&port->lock, flags); |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 391 | usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC); |
Johan Hovold | ca0400d | 2014-03-12 19:09:41 +0100 | [diff] [blame] | 392 | } else { |
Pete Zaitcev | b507cc9 | 2008-03-04 23:28:42 -0800 | [diff] [blame] | 393 | spin_unlock_irqrestore(&port->lock, flags); |
Johan Hovold | ca0400d | 2014-03-12 19:09:41 +0100 | [diff] [blame] | 394 | } |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 395 | } |
Luiz Fernando N. Capitulino | 166ffcc | 2006-07-11 14:19:25 -0300 | [diff] [blame] | 396 | EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 398 | void usb_serial_generic_write_bulk_callback(struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | { |
Jason Wessel | 715b1dc | 2009-05-11 15:24:07 -0500 | [diff] [blame] | 400 | unsigned long flags; |
Ming Lei | cdc9779 | 2008-02-24 18:41:47 +0800 | [diff] [blame] | 401 | struct usb_serial_port *port = urb->context; |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 402 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
Johan Hovold | ca0400d | 2014-03-12 19:09:41 +0100 | [diff] [blame] | 404 | for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) { |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 405 | if (port->write_urbs[i] == urb) |
| 406 | break; |
Johan Hovold | ca0400d | 2014-03-12 19:09:41 +0100 | [diff] [blame] | 407 | } |
Johan Hovold | c23e5fc | 2010-05-05 23:58:13 +0200 | [diff] [blame] | 408 | spin_lock_irqsave(&port->lock, flags); |
| 409 | port->tx_bytes -= urb->transfer_buffer_length; |
| 410 | set_bit(i, &port->write_urbs_free); |
| 411 | spin_unlock_irqrestore(&port->lock, flags); |
| 412 | |
Johan Hovold | bd58c7b | 2014-03-12 19:09:40 +0100 | [diff] [blame] | 413 | switch (urb->status) { |
| 414 | case 0: |
| 415 | break; |
| 416 | case -ENOENT: |
| 417 | case -ECONNRESET: |
| 418 | case -ESHUTDOWN: |
| 419 | dev_dbg(&port->dev, "%s - urb stopped: %d\n", |
| 420 | __func__, urb->status); |
| 421 | return; |
| 422 | case -EPIPE: |
| 423 | dev_err_console(port, "%s - urb stopped: %d\n", |
| 424 | __func__, urb->status); |
| 425 | return; |
| 426 | default: |
| 427 | dev_err_console(port, "%s - nonzero urb status: %d\n", |
| 428 | __func__, urb->status); |
| 429 | goto resubmit; |
Jason Wessel | 715b1dc | 2009-05-11 15:24:07 -0500 | [diff] [blame] | 430 | } |
| 431 | |
Johan Hovold | bd58c7b | 2014-03-12 19:09:40 +0100 | [diff] [blame] | 432 | resubmit: |
| 433 | usb_serial_generic_write_start(port, GFP_ATOMIC); |
Pete Zaitcev | cf2c748 | 2006-05-22 21:58:49 -0700 | [diff] [blame] | 434 | usb_serial_port_softint(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
Greg Kroah-Hartman | bb83398 | 2005-11-17 09:48:18 -0800 | [diff] [blame] | 436 | EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 438 | void usb_serial_generic_throttle(struct tty_struct *tty) |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 439 | { |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 440 | struct usb_serial_port *port = tty->driver_data; |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 441 | unsigned long flags; |
| 442 | |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 443 | spin_lock_irqsave(&port->lock, flags); |
| 444 | port->throttle_req = 1; |
| 445 | spin_unlock_irqrestore(&port->lock, flags); |
| 446 | } |
Johan Hovold | f1e949a | 2010-03-17 23:05:59 +0100 | [diff] [blame] | 447 | EXPORT_SYMBOL_GPL(usb_serial_generic_throttle); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 448 | |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 449 | void usb_serial_generic_unthrottle(struct tty_struct *tty) |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 450 | { |
Alan Cox | 95da310 | 2008-07-22 11:09:07 +0100 | [diff] [blame] | 451 | struct usb_serial_port *port = tty->driver_data; |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 452 | int was_throttled; |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 453 | |
Johan Hovold | 0f3d5ba | 2010-03-17 23:05:56 +0100 | [diff] [blame] | 454 | spin_lock_irq(&port->lock); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 455 | was_throttled = port->throttled; |
| 456 | port->throttled = port->throttle_req = 0; |
Johan Hovold | 0f3d5ba | 2010-03-17 23:05:56 +0100 | [diff] [blame] | 457 | spin_unlock_irq(&port->lock); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 458 | |
Johan Hovold | 0f3d5ba | 2010-03-17 23:05:56 +0100 | [diff] [blame] | 459 | if (was_throttled) |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 460 | usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 461 | } |
Johan Hovold | f1e949a | 2010-03-17 23:05:59 +0100 | [diff] [blame] | 462 | EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle); |
Joris van Rantwijk | 253ca92 | 2007-02-01 20:08:18 +0100 | [diff] [blame] | 463 | |
Johan Hovold | 980373b | 2013-03-21 12:36:52 +0100 | [diff] [blame] | 464 | static bool usb_serial_generic_msr_changed(struct tty_struct *tty, |
| 465 | unsigned long arg, struct async_icount *cprev) |
| 466 | { |
| 467 | struct usb_serial_port *port = tty->driver_data; |
| 468 | struct async_icount cnow; |
| 469 | unsigned long flags; |
| 470 | bool ret; |
| 471 | |
| 472 | /* |
| 473 | * Use tty-port initialised flag to detect all hangups including the |
| 474 | * one generated at USB-device disconnect. |
Johan Hovold | 980373b | 2013-03-21 12:36:52 +0100 | [diff] [blame] | 475 | */ |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 476 | if (!tty_port_initialized(&port->port)) |
Johan Hovold | 980373b | 2013-03-21 12:36:52 +0100 | [diff] [blame] | 477 | return true; |
| 478 | |
| 479 | spin_lock_irqsave(&port->lock, flags); |
| 480 | cnow = port->icount; /* atomic copy*/ |
| 481 | spin_unlock_irqrestore(&port->lock, flags); |
| 482 | |
| 483 | ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) || |
| 484 | ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) || |
| 485 | ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) || |
| 486 | ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts)); |
| 487 | |
| 488 | *cprev = cnow; |
| 489 | |
| 490 | return ret; |
| 491 | } |
| 492 | |
| 493 | int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg) |
| 494 | { |
| 495 | struct usb_serial_port *port = tty->driver_data; |
| 496 | struct async_icount cnow; |
| 497 | unsigned long flags; |
| 498 | int ret; |
| 499 | |
| 500 | spin_lock_irqsave(&port->lock, flags); |
| 501 | cnow = port->icount; /* atomic copy */ |
| 502 | spin_unlock_irqrestore(&port->lock, flags); |
| 503 | |
| 504 | ret = wait_event_interruptible(port->port.delta_msr_wait, |
| 505 | usb_serial_generic_msr_changed(tty, arg, &cnow)); |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 506 | if (!ret && !tty_port_initialized(&port->port)) |
Johan Hovold | 91c4211 | 2013-06-26 16:47:21 +0200 | [diff] [blame] | 507 | ret = -EIO; |
Johan Hovold | 980373b | 2013-03-21 12:36:52 +0100 | [diff] [blame] | 508 | |
| 509 | return ret; |
| 510 | } |
| 511 | EXPORT_SYMBOL_GPL(usb_serial_generic_tiocmiwait); |
| 512 | |
Johan Hovold | befefcd | 2013-03-21 12:36:54 +0100 | [diff] [blame] | 513 | int usb_serial_generic_get_icount(struct tty_struct *tty, |
| 514 | struct serial_icounter_struct *icount) |
| 515 | { |
| 516 | struct usb_serial_port *port = tty->driver_data; |
| 517 | struct async_icount cnow; |
| 518 | unsigned long flags; |
| 519 | |
| 520 | spin_lock_irqsave(&port->lock, flags); |
| 521 | cnow = port->icount; /* atomic copy */ |
| 522 | spin_unlock_irqrestore(&port->lock, flags); |
| 523 | |
| 524 | icount->cts = cnow.cts; |
| 525 | icount->dsr = cnow.dsr; |
| 526 | icount->rng = cnow.rng; |
| 527 | icount->dcd = cnow.dcd; |
| 528 | icount->tx = cnow.tx; |
| 529 | icount->rx = cnow.rx; |
| 530 | icount->frame = cnow.frame; |
| 531 | icount->parity = cnow.parity; |
| 532 | icount->overrun = cnow.overrun; |
| 533 | icount->brk = cnow.brk; |
| 534 | icount->buf_overrun = cnow.buf_overrun; |
| 535 | |
| 536 | return 0; |
| 537 | } |
| 538 | EXPORT_SYMBOL_GPL(usb_serial_generic_get_icount); |
| 539 | |
Randy Dunlap | 7f0ae3a | 2010-03-25 11:29:16 -0700 | [diff] [blame] | 540 | #ifdef CONFIG_MAGIC_SYSRQ |
Dmitry Torokhov | 6ee9f4b | 2010-08-17 21:15:47 -0700 | [diff] [blame] | 541 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
Jason Wessel | 98fcb5f | 2009-05-11 15:24:09 -0500 | [diff] [blame] | 542 | { |
Jason Wessel | bd5afa9 | 2010-03-08 21:50:12 -0600 | [diff] [blame] | 543 | if (port->sysrq && port->port.console) { |
Jason Wessel | 98fcb5f | 2009-05-11 15:24:09 -0500 | [diff] [blame] | 544 | if (ch && time_before(jiffies, port->sysrq)) { |
Dmitry Torokhov | f335397 | 2010-08-17 21:15:47 -0700 | [diff] [blame] | 545 | handle_sysrq(ch); |
Jason Wessel | 98fcb5f | 2009-05-11 15:24:09 -0500 | [diff] [blame] | 546 | port->sysrq = 0; |
| 547 | return 1; |
| 548 | } |
| 549 | port->sysrq = 0; |
| 550 | } |
| 551 | return 0; |
| 552 | } |
Randy Dunlap | 7f0ae3a | 2010-03-25 11:29:16 -0700 | [diff] [blame] | 553 | #else |
Dmitry Torokhov | 6ee9f4b | 2010-08-17 21:15:47 -0700 | [diff] [blame] | 554 | int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) |
Randy Dunlap | 7f0ae3a | 2010-03-25 11:29:16 -0700 | [diff] [blame] | 555 | { |
| 556 | return 0; |
| 557 | } |
| 558 | #endif |
Jason Wessel | 98fcb5f | 2009-05-11 15:24:09 -0500 | [diff] [blame] | 559 | EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); |
| 560 | |
| 561 | int usb_serial_handle_break(struct usb_serial_port *port) |
| 562 | { |
| 563 | if (!port->sysrq) { |
| 564 | port->sysrq = jiffies + HZ*5; |
| 565 | return 1; |
| 566 | } |
| 567 | port->sysrq = 0; |
| 568 | return 0; |
| 569 | } |
| 570 | EXPORT_SYMBOL_GPL(usb_serial_handle_break); |
| 571 | |
Libor Pechacek | d14fc1a | 2011-01-14 14:30:21 +0100 | [diff] [blame] | 572 | /** |
Johan Hovold | 92ad247 | 2013-10-09 17:01:10 +0200 | [diff] [blame] | 573 | * usb_serial_handle_dcd_change - handle a change of carrier detect state |
| 574 | * @port: usb-serial port |
| 575 | * @tty: tty for the port |
| 576 | * @status: new carrier detect status, nonzero if active |
Libor Pechacek | d14fc1a | 2011-01-14 14:30:21 +0100 | [diff] [blame] | 577 | */ |
| 578 | void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port, |
| 579 | struct tty_struct *tty, unsigned int status) |
| 580 | { |
| 581 | struct tty_port *port = &usb_port->port; |
| 582 | |
Johan Hovold | 49bd196 | 2013-03-21 12:36:27 +0100 | [diff] [blame] | 583 | dev_dbg(&usb_port->dev, "%s - status %d\n", __func__, status); |
Libor Pechacek | d14fc1a | 2011-01-14 14:30:21 +0100 | [diff] [blame] | 584 | |
Paul Chavent | 833efc0 | 2013-09-16 08:41:00 +0200 | [diff] [blame] | 585 | if (tty) { |
| 586 | struct tty_ldisc *ld = tty_ldisc_ref(tty); |
| 587 | |
| 588 | if (ld) { |
| 589 | if (ld->ops->dcd_change) |
| 590 | ld->ops->dcd_change(tty, status); |
| 591 | tty_ldisc_deref(ld); |
| 592 | } |
| 593 | } |
| 594 | |
Libor Pechacek | d14fc1a | 2011-01-14 14:30:21 +0100 | [diff] [blame] | 595 | if (status) |
| 596 | wake_up_interruptible(&port->open_wait); |
| 597 | else if (tty && !C_CLOCAL(tty)) |
| 598 | tty_hangup(tty); |
| 599 | } |
| 600 | EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change); |
| 601 | |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 602 | int usb_serial_generic_resume(struct usb_serial *serial) |
| 603 | { |
| 604 | struct usb_serial_port *port; |
| 605 | int i, c = 0, r; |
| 606 | |
| 607 | for (i = 0; i < serial->num_ports; i++) { |
| 608 | port = serial->port[i]; |
Peter Hurley | d41861c | 2016-04-09 17:53:25 -0700 | [diff] [blame] | 609 | if (!tty_port_initialized(&port->port)) |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 610 | continue; |
| 611 | |
Johan Hovold | d83b405 | 2011-11-06 19:06:37 +0100 | [diff] [blame] | 612 | if (port->bulk_in_size) { |
| 613 | r = usb_serial_generic_submit_read_urbs(port, |
| 614 | GFP_NOIO); |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 615 | if (r < 0) |
| 616 | c++; |
| 617 | } |
| 618 | |
Johan Hovold | 27c7acf | 2010-05-05 23:57:37 +0200 | [diff] [blame] | 619 | if (port->bulk_out_size) { |
Johan Hovold | 818f603 | 2013-10-09 17:01:11 +0200 | [diff] [blame] | 620 | r = usb_serial_generic_write_start(port, GFP_NOIO); |
David VomLehn | 8e8dce0 | 2009-08-28 12:54:27 -0700 | [diff] [blame] | 621 | if (r < 0) |
| 622 | c++; |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | return c ? -EIO : 0; |
| 627 | } |
| 628 | EXPORT_SYMBOL_GPL(usb_serial_generic_resume); |