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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> | |
68b44eae | 14 | #include <linux/tty.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
68b44eae GKH |
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 | ||
7d40d7e8 | 23 | static const struct usb_device_id id_table[] = { |
68b44eae GKH |
24 | { USB_DEVICE(0x05e0, 0x0600) }, |
25 | { }, | |
26 | }; | |
27 | MODULE_DEVICE_TABLE(usb, id_table); | |
28 | ||
68b44eae | 29 | struct symbol_private { |
68b44eae GKH |
30 | spinlock_t lock; /* protects the following flags */ |
31 | bool throttled; | |
32 | bool actually_throttled; | |
68b44eae GKH |
33 | }; |
34 | ||
35 | static void symbol_int_callback(struct urb *urb) | |
36 | { | |
cced926f | 37 | struct usb_serial_port *port = urb->context; |
a85796ee | 38 | struct symbol_private *priv = usb_get_serial_port_data(port); |
68b44eae | 39 | unsigned char *data = urb->transfer_buffer; |
68b44eae | 40 | int status = urb->status; |
68b44eae | 41 | int result; |
68b44eae GKH |
42 | int data_length; |
43 | ||
68b44eae GKH |
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 */ | |
e4083ea5 GKH |
52 | dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", |
53 | __func__, status); | |
68b44eae GKH |
54 | return; |
55 | default: | |
e4083ea5 GKH |
56 | dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", |
57 | __func__, status); | |
68b44eae GKH |
58 | goto exit; |
59 | } | |
60 | ||
59d33f2f | 61 | usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
68b44eae GKH |
62 | |
63 | if (urb->actual_length > 1) { | |
64 | data_length = urb->actual_length - 1; | |
65 | ||
66 | /* | |
67 | * Data from the device comes with a 1 byte header: | |
68 | * | |
69 | * <size of data>data... | |
70 | * This is real data to be sent to the tty layer | |
71 | * we pretty much just ignore the size and send everything | |
72 | * else to the tty layer. | |
73 | */ | |
2e124b4a JS |
74 | tty_insert_flip_string(&port->port, &data[1], data_length); |
75 | tty_flip_buffer_push(&port->port); | |
68b44eae | 76 | } else { |
d9a38a87 | 77 | dev_dbg(&port->dev, "%s - short packet\n", __func__); |
68b44eae GKH |
78 | } |
79 | ||
80 | exit: | |
81 | spin_lock(&priv->lock); | |
82 | ||
83 | /* Continue trying to always read if we should */ | |
84 | if (!priv->throttled) { | |
cced926f | 85 | result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
68b44eae GKH |
86 | if (result) |
87 | dev_err(&port->dev, | |
88 | "%s - failed resubmitting read urb, error %d\n", | |
89 | __func__, result); | |
90 | } else | |
91 | priv->actually_throttled = true; | |
92 | spin_unlock(&priv->lock); | |
93 | } | |
94 | ||
a509a7e4 | 95 | static int symbol_open(struct tty_struct *tty, struct usb_serial_port *port) |
68b44eae | 96 | { |
951d3793 | 97 | struct symbol_private *priv = usb_get_serial_port_data(port); |
68b44eae GKH |
98 | unsigned long flags; |
99 | int result = 0; | |
100 | ||
68b44eae GKH |
101 | spin_lock_irqsave(&priv->lock, flags); |
102 | priv->throttled = false; | |
103 | priv->actually_throttled = false; | |
68b44eae GKH |
104 | spin_unlock_irqrestore(&priv->lock, flags); |
105 | ||
68b44eae | 106 | /* Start reading from the device */ |
cced926f | 107 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
68b44eae GKH |
108 | if (result) |
109 | dev_err(&port->dev, | |
110 | "%s - failed resubmitting read urb, error %d\n", | |
111 | __func__, result); | |
112 | return result; | |
113 | } | |
114 | ||
335f8514 | 115 | static void symbol_close(struct usb_serial_port *port) |
68b44eae | 116 | { |
cced926f | 117 | usb_kill_urb(port->interrupt_in_urb); |
68b44eae GKH |
118 | } |
119 | ||
120 | static void symbol_throttle(struct tty_struct *tty) | |
121 | { | |
122 | struct usb_serial_port *port = tty->driver_data; | |
951d3793 | 123 | struct symbol_private *priv = usb_get_serial_port_data(port); |
68b44eae | 124 | |
63832515 | 125 | spin_lock_irq(&priv->lock); |
68b44eae | 126 | priv->throttled = true; |
63832515 | 127 | spin_unlock_irq(&priv->lock); |
68b44eae GKH |
128 | } |
129 | ||
130 | static void symbol_unthrottle(struct tty_struct *tty) | |
131 | { | |
132 | struct usb_serial_port *port = tty->driver_data; | |
951d3793 | 133 | struct symbol_private *priv = usb_get_serial_port_data(port); |
68b44eae | 134 | int result; |
b2a5cf1b | 135 | bool was_throttled; |
68b44eae | 136 | |
63832515 | 137 | spin_lock_irq(&priv->lock); |
68b44eae | 138 | priv->throttled = false; |
b2a5cf1b | 139 | was_throttled = priv->actually_throttled; |
68b44eae | 140 | priv->actually_throttled = false; |
63832515 | 141 | spin_unlock_irq(&priv->lock); |
68b44eae | 142 | |
b2a5cf1b | 143 | if (was_throttled) { |
cced926f | 144 | result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
b2a5cf1b ON |
145 | if (result) |
146 | dev_err(&port->dev, | |
147 | "%s - failed submitting read urb, error %d\n", | |
68b44eae | 148 | __func__, result); |
b2a5cf1b | 149 | } |
68b44eae GKH |
150 | } |
151 | ||
152 | static int symbol_startup(struct usb_serial *serial) | |
153 | { | |
cced926f JH |
154 | if (!serial->num_interrupt_in) { |
155 | dev_err(&serial->dev->dev, "no interrupt-in endpoint\n"); | |
156 | return -ENODEV; | |
157 | } | |
68b44eae | 158 | |
a85796ee JH |
159 | return 0; |
160 | } | |
161 | ||
162 | static int symbol_port_probe(struct usb_serial_port *port) | |
163 | { | |
164 | struct symbol_private *priv; | |
165 | ||
68b44eae | 166 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
a85796ee | 167 | if (!priv) |
68b44eae | 168 | return -ENOMEM; |
a85796ee | 169 | |
68b44eae | 170 | spin_lock_init(&priv->lock); |
68b44eae | 171 | |
a85796ee JH |
172 | usb_set_serial_port_data(port, priv); |
173 | ||
68b44eae | 174 | return 0; |
f9c99bb8 AS |
175 | } |
176 | ||
a85796ee | 177 | static int symbol_port_remove(struct usb_serial_port *port) |
f9c99bb8 | 178 | { |
a85796ee | 179 | struct symbol_private *priv = usb_get_serial_port_data(port); |
f9c99bb8 | 180 | |
68b44eae | 181 | kfree(priv); |
a85796ee JH |
182 | |
183 | return 0; | |
68b44eae GKH |
184 | } |
185 | ||
68b44eae GKH |
186 | static struct usb_serial_driver symbol_device = { |
187 | .driver = { | |
188 | .owner = THIS_MODULE, | |
189 | .name = "symbol", | |
190 | }, | |
191 | .id_table = id_table, | |
68b44eae GKH |
192 | .num_ports = 1, |
193 | .attach = symbol_startup, | |
a85796ee JH |
194 | .port_probe = symbol_port_probe, |
195 | .port_remove = symbol_port_remove, | |
68b44eae GKH |
196 | .open = symbol_open, |
197 | .close = symbol_close, | |
68b44eae GKH |
198 | .throttle = symbol_throttle, |
199 | .unthrottle = symbol_unthrottle, | |
cced926f | 200 | .read_int_callback = symbol_int_callback, |
68b44eae GKH |
201 | }; |
202 | ||
d860322f AS |
203 | static struct usb_serial_driver * const serial_drivers[] = { |
204 | &symbol_device, NULL | |
205 | }; | |
206 | ||
68e24113 | 207 | module_usb_serial_driver(serial_drivers, id_table); |
68b44eae | 208 | |
68b44eae | 209 | MODULE_LICENSE("GPL"); |