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68b44eae GKH |
1 | /* |
2 | * Symbol USB barcode to serial driver | |
3 | * | |
a85796ee | 4 | * Copyright (C) 2013 Johan Hovold <jhovold@gmail.com> |
68b44eae GKH |
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> | |
14 | #include <linux/init.h> | |
15 | #include <linux/tty.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
68b44eae GKH |
17 | #include <linux/tty_driver.h> |
18 | #include <linux/tty_flip.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/usb.h> | |
21 | #include <linux/usb/serial.h> | |
22 | #include <linux/uaccess.h> | |
23 | ||
7d40d7e8 | 24 | static const struct usb_device_id id_table[] = { |
68b44eae GKH |
25 | { USB_DEVICE(0x05e0, 0x0600) }, |
26 | { }, | |
27 | }; | |
28 | MODULE_DEVICE_TABLE(usb, id_table); | |
29 | ||
68b44eae | 30 | struct symbol_private { |
68b44eae GKH |
31 | spinlock_t lock; /* protects the following flags */ |
32 | bool throttled; | |
33 | bool actually_throttled; | |
68b44eae GKH |
34 | }; |
35 | ||
36 | static void symbol_int_callback(struct urb *urb) | |
37 | { | |
cced926f | 38 | struct usb_serial_port *port = urb->context; |
a85796ee | 39 | struct symbol_private *priv = usb_get_serial_port_data(port); |
68b44eae | 40 | unsigned char *data = urb->transfer_buffer; |
68b44eae | 41 | int status = urb->status; |
68b44eae | 42 | int result; |
68b44eae GKH |
43 | int data_length; |
44 | ||
68b44eae GKH |
45 | switch (status) { |
46 | case 0: | |
47 | /* success */ | |
48 | break; | |
49 | case -ECONNRESET: | |
50 | case -ENOENT: | |
51 | case -ESHUTDOWN: | |
52 | /* this urb is terminated, clean up */ | |
e4083ea5 GKH |
53 | dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", |
54 | __func__, status); | |
68b44eae GKH |
55 | return; |
56 | default: | |
e4083ea5 GKH |
57 | dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", |
58 | __func__, status); | |
68b44eae GKH |
59 | goto exit; |
60 | } | |
61 | ||
59d33f2f | 62 | usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
68b44eae GKH |
63 | |
64 | if (urb->actual_length > 1) { | |
65 | data_length = urb->actual_length - 1; | |
66 | ||
67 | /* | |
68 | * Data from the device comes with a 1 byte header: | |
69 | * | |
70 | * <size of data>data... | |
71 | * This is real data to be sent to the tty layer | |
72 | * we pretty much just ignore the size and send everything | |
73 | * else to the tty layer. | |
74 | */ | |
2e124b4a JS |
75 | tty_insert_flip_string(&port->port, &data[1], data_length); |
76 | tty_flip_buffer_push(&port->port); | |
68b44eae | 77 | } else { |
ef31025d | 78 | dev_dbg(&port->dev, |
9ddc5b6f | 79 | "Improper amount of data received from the device, " |
68b44eae GKH |
80 | "%d bytes", urb->actual_length); |
81 | } | |
82 | ||
83 | exit: | |
84 | spin_lock(&priv->lock); | |
85 | ||
86 | /* Continue trying to always read if we should */ | |
87 | if (!priv->throttled) { | |
cced926f | 88 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
68b44eae GKH |
89 | if (result) |
90 | dev_err(&port->dev, | |
91 | "%s - failed resubmitting read urb, error %d\n", | |
92 | __func__, result); | |
93 | } else | |
94 | priv->actually_throttled = true; | |
95 | spin_unlock(&priv->lock); | |
96 | } | |
97 | ||
a509a7e4 | 98 | static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port) |
68b44eae GKH |
99 | { |
100 | struct symbol_private *priv = usb_get_serial_data(port->serial); | |
101 | unsigned long flags; | |
102 | int result = 0; | |
103 | ||
68b44eae GKH |
104 | spin_lock_irqsave(&priv->lock, flags); |
105 | priv->throttled = false; | |
106 | priv->actually_throttled = false; | |
68b44eae GKH |
107 | spin_unlock_irqrestore(&priv->lock, flags); |
108 | ||
68b44eae | 109 | /* Start reading from the device */ |
cced926f | 110 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
68b44eae GKH |
111 | if (result) |
112 | dev_err(&port->dev, | |
113 | "%s - failed resubmitting read urb, error %d\n", | |
114 | __func__, result); | |
115 | return result; | |
116 | } | |
117 | ||
335f8514 | 118 | static void symbol_close(struct usb_serial_port *port) |
68b44eae | 119 | { |
cced926f | 120 | usb_kill_urb(port->interrupt_in_urb); |
68b44eae GKH |
121 | } |
122 | ||
123 | static void symbol_throttle(struct tty_struct *tty) | |
124 | { | |
125 | struct usb_serial_port *port = tty->driver_data; | |
126 | struct symbol_private *priv = usb_get_serial_data(port->serial); | |
68b44eae | 127 | |
63832515 | 128 | spin_lock_irq(&priv->lock); |
68b44eae | 129 | priv->throttled = true; |
63832515 | 130 | spin_unlock_irq(&priv->lock); |
68b44eae GKH |
131 | } |
132 | ||
133 | static void symbol_unthrottle(struct tty_struct *tty) | |
134 | { | |
135 | struct usb_serial_port *port = tty->driver_data; | |
136 | struct symbol_private *priv = usb_get_serial_data(port->serial); | |
68b44eae | 137 | int result; |
b2a5cf1b | 138 | bool was_throttled; |
68b44eae | 139 | |
63832515 | 140 | spin_lock_irq(&priv->lock); |
68b44eae | 141 | priv->throttled = false; |
b2a5cf1b | 142 | was_throttled = priv->actually_throttled; |
68b44eae | 143 | priv->actually_throttled = false; |
63832515 | 144 | spin_unlock_irq(&priv->lock); |
68b44eae | 145 | |
b2a5cf1b | 146 | if (was_throttled) { |
cced926f | 147 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
b2a5cf1b ON |
148 | if (result) |
149 | dev_err(&port->dev, | |
150 | "%s - failed submitting read urb, error %d\n", | |
68b44eae | 151 | __func__, result); |
b2a5cf1b | 152 | } |
68b44eae GKH |
153 | } |
154 | ||
155 | static int symbol_startup(struct usb_serial *serial) | |
156 | { | |
cced926f JH |
157 | if (!serial->num_interrupt_in) { |
158 | dev_err(&serial->dev->dev, "no interrupt-in endpoint\n"); | |
159 | return -ENODEV; | |
160 | } | |
68b44eae | 161 | |
a85796ee JH |
162 | return 0; |
163 | } | |
164 | ||
165 | static int symbol_port_probe(struct usb_serial_port *port) | |
166 | { | |
167 | struct symbol_private *priv; | |
168 | ||
68b44eae | 169 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
a85796ee | 170 | if (!priv) |
68b44eae | 171 | return -ENOMEM; |
a85796ee | 172 | |
68b44eae | 173 | spin_lock_init(&priv->lock); |
68b44eae | 174 | |
a85796ee JH |
175 | usb_set_serial_port_data(port, priv); |
176 | ||
68b44eae | 177 | return 0; |
f9c99bb8 AS |
178 | } |
179 | ||
a85796ee | 180 | static int symbol_port_remove(struct usb_serial_port *port) |
f9c99bb8 | 181 | { |
a85796ee | 182 | struct symbol_private *priv = usb_get_serial_port_data(port); |
f9c99bb8 | 183 | |
68b44eae | 184 | kfree(priv); |
a85796ee JH |
185 | |
186 | return 0; | |
68b44eae GKH |
187 | } |
188 | ||
68b44eae GKH |
189 | static struct usb_serial_driver symbol_device = { |
190 | .driver = { | |
191 | .owner = THIS_MODULE, | |
192 | .name = "symbol", | |
193 | }, | |
194 | .id_table = id_table, | |
68b44eae GKH |
195 | .num_ports = 1, |
196 | .attach = symbol_startup, | |
a85796ee JH |
197 | .port_probe = symbol_port_probe, |
198 | .port_remove = symbol_port_remove, | |
68b44eae GKH |
199 | .open = symbol_open, |
200 | .close = symbol_close, | |
68b44eae GKH |
201 | .throttle = symbol_throttle, |
202 | .unthrottle = symbol_unthrottle, | |
cced926f | 203 | .read_int_callback = symbol_int_callback, |
68b44eae GKH |
204 | }; |
205 | ||
d860322f AS |
206 | static struct usb_serial_driver * const serial_drivers[] = { |
207 | &symbol_device, NULL | |
208 | }; | |
209 | ||
68e24113 | 210 | module_usb_serial_driver(serial_drivers, id_table); |
68b44eae | 211 | |
68b44eae | 212 | MODULE_LICENSE("GPL"); |