Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Symbol USB barcode to serial driver |
| 3 | * |
Johan Hovold | a85796e | 2013-04-16 18:01:30 +0200 | [diff] [blame] | 4 | * Copyright (C) 2013 Johan Hovold <jhovold@gmail.com> |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 5 | * Copyright (C) 2009 Greg Kroah-Hartman <gregkh@suse.de> |
| 6 | * Copyright (C) 2009 Novell Inc. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License version |
| 10 | * 2 as published by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 14 | #include <linux/tty.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 16 | #include <linux/tty_driver.h> |
| 17 | #include <linux/tty_flip.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/usb.h> |
| 20 | #include <linux/usb/serial.h> |
| 21 | #include <linux/uaccess.h> |
| 22 | |
Németh Márton | 7d40d7e | 2010-01-10 15:34:24 +0100 | [diff] [blame] | 23 | static const struct usb_device_id id_table[] = { |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 24 | { USB_DEVICE(0x05e0, 0x0600) }, |
| 25 | { }, |
| 26 | }; |
| 27 | MODULE_DEVICE_TABLE(usb, id_table); |
| 28 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 29 | struct symbol_private { |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 30 | spinlock_t lock; /* protects the following flags */ |
| 31 | bool throttled; |
| 32 | bool actually_throttled; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 33 | }; |
| 34 | |
| 35 | static void symbol_int_callback(struct urb *urb) |
| 36 | { |
Johan Hovold | cced926 | 2013-04-16 18:01:28 +0200 | [diff] [blame] | 37 | struct usb_serial_port *port = urb->context; |
Johan Hovold | a85796e | 2013-04-16 18:01:30 +0200 | [diff] [blame] | 38 | struct symbol_private *priv = usb_get_serial_port_data(port); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 39 | unsigned char *data = urb->transfer_buffer; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 40 | int status = urb->status; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 41 | int result; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 42 | int data_length; |
| 43 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 44 | switch (status) { |
| 45 | case 0: |
| 46 | /* success */ |
| 47 | break; |
| 48 | case -ECONNRESET: |
| 49 | case -ENOENT: |
| 50 | case -ESHUTDOWN: |
| 51 | /* this urb is terminated, clean up */ |
Greg Kroah-Hartman | e4083ea | 2012-05-15 16:27:32 -0700 | [diff] [blame] | 52 | dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", |
| 53 | __func__, status); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 54 | return; |
| 55 | default: |
Greg Kroah-Hartman | e4083ea | 2012-05-15 16:27:32 -0700 | [diff] [blame] | 56 | dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", |
| 57 | __func__, status); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 58 | goto exit; |
| 59 | } |
| 60 | |
Greg Kroah-Hartman | 59d33f2 | 2012-09-18 09:58:57 +0100 | [diff] [blame] | 61 | usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 62 | |
Philipp Hachtmann | 8ae25a3 | 2015-08-17 17:31:47 +0200 | [diff] [blame] | 63 | /* |
| 64 | * Data from the device comes with a 1 byte header: |
| 65 | * |
| 66 | * <size of data> <data>... |
| 67 | */ |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 68 | if (urb->actual_length > 1) { |
Philipp Hachtmann | 8ae25a3 | 2015-08-17 17:31:47 +0200 | [diff] [blame] | 69 | data_length = data[0]; |
| 70 | if (data_length > (urb->actual_length - 1)) |
| 71 | data_length = urb->actual_length - 1; |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 72 | tty_insert_flip_string(&port->port, &data[1], data_length); |
| 73 | tty_flip_buffer_push(&port->port); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 74 | } else { |
Johan Hovold | d9a38a8 | 2014-03-12 19:09:42 +0100 | [diff] [blame] | 75 | dev_dbg(&port->dev, "%s - short packet\n", __func__); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | exit: |
| 79 | spin_lock(&priv->lock); |
| 80 | |
| 81 | /* Continue trying to always read if we should */ |
| 82 | if (!priv->throttled) { |
Johan Hovold | cced926 | 2013-04-16 18:01:28 +0200 | [diff] [blame] | 83 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 84 | if (result) |
| 85 | dev_err(&port->dev, |
| 86 | "%s - failed resubmitting read urb, error %d\n", |
| 87 | __func__, result); |
| 88 | } else |
| 89 | priv->actually_throttled = true; |
| 90 | spin_unlock(&priv->lock); |
| 91 | } |
| 92 | |
Alan Cox | a509a7e | 2009-09-19 13:13:26 -0700 | [diff] [blame] | 93 | static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port) |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 94 | { |
Philipp Hachtmann | 951d3793 | 2015-08-17 17:31:46 +0200 | [diff] [blame] | 95 | struct symbol_private *priv = usb_get_serial_port_data(port); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 96 | unsigned long flags; |
| 97 | int result = 0; |
| 98 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 99 | spin_lock_irqsave(&priv->lock, flags); |
| 100 | priv->throttled = false; |
| 101 | priv->actually_throttled = false; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 102 | spin_unlock_irqrestore(&priv->lock, flags); |
| 103 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 104 | /* Start reading from the device */ |
Johan Hovold | cced926 | 2013-04-16 18:01:28 +0200 | [diff] [blame] | 105 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 106 | if (result) |
| 107 | dev_err(&port->dev, |
| 108 | "%s - failed resubmitting read urb, error %d\n", |
| 109 | __func__, result); |
| 110 | return result; |
| 111 | } |
| 112 | |
Alan Cox | 335f851 | 2009-06-11 12:26:29 +0100 | [diff] [blame] | 113 | static void symbol_close(struct usb_serial_port *port) |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 114 | { |
Johan Hovold | cced926 | 2013-04-16 18:01:28 +0200 | [diff] [blame] | 115 | usb_kill_urb(port->interrupt_in_urb); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | static void symbol_throttle(struct tty_struct *tty) |
| 119 | { |
| 120 | struct usb_serial_port *port = tty->driver_data; |
Philipp Hachtmann | 951d3793 | 2015-08-17 17:31:46 +0200 | [diff] [blame] | 121 | struct symbol_private *priv = usb_get_serial_port_data(port); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 122 | |
Oliver Neukum | 6383251 | 2009-10-07 10:50:23 +0200 | [diff] [blame] | 123 | spin_lock_irq(&priv->lock); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 124 | priv->throttled = true; |
Oliver Neukum | 6383251 | 2009-10-07 10:50:23 +0200 | [diff] [blame] | 125 | spin_unlock_irq(&priv->lock); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | static void symbol_unthrottle(struct tty_struct *tty) |
| 129 | { |
| 130 | struct usb_serial_port *port = tty->driver_data; |
Philipp Hachtmann | 951d3793 | 2015-08-17 17:31:46 +0200 | [diff] [blame] | 131 | struct symbol_private *priv = usb_get_serial_port_data(port); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 132 | int result; |
Oliver Neukum | b2a5cf1 | 2009-10-07 09:30:49 +0200 | [diff] [blame] | 133 | bool was_throttled; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 134 | |
Oliver Neukum | 6383251 | 2009-10-07 10:50:23 +0200 | [diff] [blame] | 135 | spin_lock_irq(&priv->lock); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 136 | priv->throttled = false; |
Oliver Neukum | b2a5cf1 | 2009-10-07 09:30:49 +0200 | [diff] [blame] | 137 | was_throttled = priv->actually_throttled; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 138 | priv->actually_throttled = false; |
Oliver Neukum | 6383251 | 2009-10-07 10:50:23 +0200 | [diff] [blame] | 139 | spin_unlock_irq(&priv->lock); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 140 | |
Oliver Neukum | b2a5cf1 | 2009-10-07 09:30:49 +0200 | [diff] [blame] | 141 | if (was_throttled) { |
Johan Hovold | cced926 | 2013-04-16 18:01:28 +0200 | [diff] [blame] | 142 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
Oliver Neukum | b2a5cf1 | 2009-10-07 09:30:49 +0200 | [diff] [blame] | 143 | if (result) |
| 144 | dev_err(&port->dev, |
| 145 | "%s - failed submitting read urb, error %d\n", |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 146 | __func__, result); |
Oliver Neukum | b2a5cf1 | 2009-10-07 09:30:49 +0200 | [diff] [blame] | 147 | } |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | static int symbol_startup(struct usb_serial *serial) |
| 151 | { |
Johan Hovold | cced926 | 2013-04-16 18:01:28 +0200 | [diff] [blame] | 152 | if (!serial->num_interrupt_in) { |
| 153 | dev_err(&serial->dev->dev, "no interrupt-in endpoint\n"); |
| 154 | return -ENODEV; |
| 155 | } |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 156 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 157 | return 0; |
Alan Stern | f9c99bb | 2009-06-02 11:53:55 -0400 | [diff] [blame] | 158 | } |
| 159 | |
Johan Hovold | a85796e | 2013-04-16 18:01:30 +0200 | [diff] [blame] | 160 | static int symbol_port_probe(struct usb_serial_port *port) |
Alan Stern | f9c99bb | 2009-06-02 11:53:55 -0400 | [diff] [blame] | 161 | { |
Johan Hovold | a85796e | 2013-04-16 18:01:30 +0200 | [diff] [blame] | 162 | struct symbol_private *priv; |
| 163 | |
| 164 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| 165 | if (!priv) |
| 166 | return -ENOMEM; |
| 167 | |
| 168 | spin_lock_init(&priv->lock); |
| 169 | |
| 170 | usb_set_serial_port_data(port, priv); |
| 171 | |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | static int symbol_port_remove(struct usb_serial_port *port) |
| 176 | { |
| 177 | struct symbol_private *priv = usb_get_serial_port_data(port); |
Alan Stern | f9c99bb | 2009-06-02 11:53:55 -0400 | [diff] [blame] | 178 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 179 | kfree(priv); |
Johan Hovold | a85796e | 2013-04-16 18:01:30 +0200 | [diff] [blame] | 180 | |
| 181 | return 0; |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 182 | } |
| 183 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 184 | static struct usb_serial_driver symbol_device = { |
| 185 | .driver = { |
| 186 | .owner = THIS_MODULE, |
| 187 | .name = "symbol", |
| 188 | }, |
| 189 | .id_table = id_table, |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 190 | .num_ports = 1, |
| 191 | .attach = symbol_startup, |
Johan Hovold | a85796e | 2013-04-16 18:01:30 +0200 | [diff] [blame] | 192 | .port_probe = symbol_port_probe, |
| 193 | .port_remove = symbol_port_remove, |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 194 | .open = symbol_open, |
| 195 | .close = symbol_close, |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 196 | .throttle = symbol_throttle, |
| 197 | .unthrottle = symbol_unthrottle, |
Johan Hovold | cced926 | 2013-04-16 18:01:28 +0200 | [diff] [blame] | 198 | .read_int_callback = symbol_int_callback, |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 199 | }; |
| 200 | |
Alan Stern | d860322 | 2012-02-23 14:57:25 -0500 | [diff] [blame] | 201 | static struct usb_serial_driver * const serial_drivers[] = { |
| 202 | &symbol_device, NULL |
| 203 | }; |
| 204 | |
Greg Kroah-Hartman | 68e2411 | 2012-05-08 15:46:14 -0700 | [diff] [blame] | 205 | module_usb_serial_driver(serial_drivers, id_table); |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 206 | |
Greg Kroah-Hartman | 68b44ea | 2009-02-13 17:25:46 -0800 | [diff] [blame] | 207 | MODULE_LICENSE("GPL"); |