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Commit | Line | Data |
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57262b82 GKH |
1 | /* |
2 | * Opticon USB barcode to serial driver | |
3 | * | |
7a6ee2b0 | 4 | * Copyright (C) 2011 - 2012 Johan Hovold <jhovold@gmail.com> |
309a0579 | 5 | * Copyright (C) 2011 Martin Jansen <martin.jansen@opticon.com> |
648d4e16 GKH |
6 | * Copyright (C) 2008 - 2009 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (C) 2008 - 2009 Novell Inc. | |
57262b82 GKH |
8 | * |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License version | |
11 | * 2 as published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
57262b82 GKH |
15 | #include <linux/tty.h> |
16 | #include <linux/tty_driver.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
57262b82 | 18 | #include <linux/tty_flip.h> |
faac64ad | 19 | #include <linux/serial.h> |
57262b82 GKH |
20 | #include <linux/module.h> |
21 | #include <linux/usb.h> | |
22 | #include <linux/usb/serial.h> | |
23 | #include <linux/uaccess.h> | |
24 | ||
309a0579 MJ |
25 | #define CONTROL_RTS 0x02 |
26 | #define RESEND_CTS_STATE 0x03 | |
27 | ||
28 | /* max number of write urbs in flight */ | |
29 | #define URB_UPPER_LIMIT 8 | |
30 | ||
31 | /* This driver works for the Opticon 1D barcode reader | |
32 | * an examples of 1D barcode types are EAN, UPC, Code39, IATA etc.. */ | |
33 | #define DRIVER_DESC "Opticon USB barcode to serial driver (1D)" | |
34 | ||
7d40d7e8 | 35 | static const struct usb_device_id id_table[] = { |
57262b82 GKH |
36 | { USB_DEVICE(0x065a, 0x0009) }, |
37 | { }, | |
38 | }; | |
39 | MODULE_DEVICE_TABLE(usb, id_table); | |
40 | ||
41 | /* This structure holds all of the individual device information */ | |
42 | struct opticon_private { | |
57262b82 | 43 | spinlock_t lock; /* protects the following flags */ |
57262b82 | 44 | bool rts; |
309a0579 | 45 | bool cts; |
648d4e16 | 46 | int outstanding_urbs; |
57262b82 GKH |
47 | }; |
48 | ||
648d4e16 | 49 | |
32802077 JH |
50 | static void opticon_process_data_packet(struct usb_serial_port *port, |
51 | const unsigned char *buf, size_t len) | |
52 | { | |
05c7cd39 | 53 | tty_insert_flip_string(&port->port, buf, len); |
2e124b4a | 54 | tty_flip_buffer_push(&port->port); |
32802077 JH |
55 | } |
56 | ||
57 | static void opticon_process_status_packet(struct usb_serial_port *port, | |
58 | const unsigned char *buf, size_t len) | |
59 | { | |
60 | struct opticon_private *priv = usb_get_serial_port_data(port); | |
61 | unsigned long flags; | |
62 | ||
63 | spin_lock_irqsave(&priv->lock, flags); | |
64 | if (buf[0] == 0x00) | |
65 | priv->cts = false; | |
66 | else | |
67 | priv->cts = true; | |
68 | spin_unlock_irqrestore(&priv->lock, flags); | |
69 | } | |
70 | ||
71 | static void opticon_process_read_urb(struct urb *urb) | |
72 | { | |
73 | struct usb_serial_port *port = urb->context; | |
74 | const unsigned char *hdr = urb->transfer_buffer; | |
75 | const unsigned char *data = hdr + 2; | |
76 | size_t data_len = urb->actual_length - 2; | |
77 | ||
78 | if (urb->actual_length <= 2) { | |
79 | dev_dbg(&port->dev, "malformed packet received: %d bytes\n", | |
80 | urb->actual_length); | |
81 | return; | |
82 | } | |
83 | /* | |
84 | * Data from the device comes with a 2 byte header: | |
85 | * | |
86 | * <0x00><0x00>data... | |
87 | * This is real data to be sent to the tty layer | |
88 | * <0x00><0x01>level | |
89 | * This is a CTS level change, the third byte is the CTS | |
90 | * value (0 for low, 1 for high). | |
91 | */ | |
92 | if ((hdr[0] == 0x00) && (hdr[1] == 0x00)) { | |
93 | opticon_process_data_packet(port, data, data_len); | |
94 | } else if ((hdr[0] == 0x00) && (hdr[1] == 0x01)) { | |
95 | opticon_process_status_packet(port, data, data_len); | |
96 | } else { | |
97 | dev_dbg(&port->dev, "unknown packet received: %02x %02x\n", | |
98 | hdr[0], hdr[1]); | |
99 | } | |
100 | } | |
309a0579 | 101 | |
309a0579 MJ |
102 | static int send_control_msg(struct usb_serial_port *port, u8 requesttype, |
103 | u8 val) | |
104 | { | |
105 | struct usb_serial *serial = port->serial; | |
106 | int retval; | |
ea0dbebf JH |
107 | u8 *buffer; |
108 | ||
109 | buffer = kzalloc(1, GFP_KERNEL); | |
110 | if (!buffer) | |
111 | return -ENOMEM; | |
309a0579 MJ |
112 | |
113 | buffer[0] = val; | |
114 | /* Send the message to the vendor control endpoint | |
115 | * of the connected device */ | |
116 | retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), | |
117 | requesttype, | |
118 | USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, | |
119 | 0, 0, buffer, 1, 0); | |
ea0dbebf | 120 | kfree(buffer); |
309a0579 | 121 | |
94c51dca JH |
122 | if (retval < 0) |
123 | return retval; | |
124 | ||
125 | return 0; | |
309a0579 MJ |
126 | } |
127 | ||
a509a7e4 | 128 | static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port) |
57262b82 | 129 | { |
70d25eee | 130 | struct opticon_private *priv = usb_get_serial_port_data(port); |
57262b82 | 131 | unsigned long flags; |
7a6ee2b0 | 132 | int res; |
57262b82 | 133 | |
57262b82 | 134 | spin_lock_irqsave(&priv->lock, flags); |
309a0579 | 135 | priv->rts = false; |
57262b82 GKH |
136 | spin_unlock_irqrestore(&priv->lock, flags); |
137 | ||
309a0579 MJ |
138 | /* Clear RTS line */ |
139 | send_control_msg(port, CONTROL_RTS, 0); | |
140 | ||
cd8c5053 | 141 | /* clear the halt status of the endpoint */ |
7a6ee2b0 JH |
142 | usb_clear_halt(port->serial->dev, port->read_urb->pipe); |
143 | ||
144 | res = usb_serial_generic_open(tty, port); | |
2eee0502 | 145 | if (res) |
7a6ee2b0 | 146 | return res; |
309a0579 | 147 | |
309a0579 MJ |
148 | /* Request CTS line state, sometimes during opening the current |
149 | * CTS state can be missed. */ | |
150 | send_control_msg(port, RESEND_CTS_STATE, 1); | |
57262b82 | 151 | |
7a6ee2b0 | 152 | return res; |
57262b82 GKH |
153 | } |
154 | ||
309a0579 | 155 | static void opticon_write_control_callback(struct urb *urb) |
648d4e16 | 156 | { |
e32d82bc JH |
157 | struct usb_serial_port *port = urb->context; |
158 | struct opticon_private *priv = usb_get_serial_port_data(port); | |
648d4e16 GKH |
159 | int status = urb->status; |
160 | unsigned long flags; | |
161 | ||
162 | /* free up the transfer buffer, as usb_free_urb() does not do this */ | |
163 | kfree(urb->transfer_buffer); | |
164 | ||
0d930e51 AZ |
165 | /* setup packet may be set if we're using it for writing */ |
166 | kfree(urb->setup_packet); | |
167 | ||
648d4e16 | 168 | if (status) |
e32d82bc | 169 | dev_dbg(&port->dev, |
e29a7738 | 170 | "%s - non-zero urb status received: %d\n", |
d44d9ab7 | 171 | __func__, status); |
648d4e16 GKH |
172 | |
173 | spin_lock_irqsave(&priv->lock, flags); | |
174 | --priv->outstanding_urbs; | |
175 | spin_unlock_irqrestore(&priv->lock, flags); | |
176 | ||
e32d82bc | 177 | usb_serial_port_softint(port); |
648d4e16 GKH |
178 | } |
179 | ||
180 | static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port, | |
181 | const unsigned char *buf, int count) | |
182 | { | |
70d25eee | 183 | struct opticon_private *priv = usb_get_serial_port_data(port); |
648d4e16 GKH |
184 | struct usb_serial *serial = port->serial; |
185 | struct urb *urb; | |
186 | unsigned char *buffer; | |
187 | unsigned long flags; | |
188 | int status; | |
309a0579 | 189 | struct usb_ctrlrequest *dr; |
648d4e16 | 190 | |
648d4e16 GKH |
191 | spin_lock_irqsave(&priv->lock, flags); |
192 | if (priv->outstanding_urbs > URB_UPPER_LIMIT) { | |
193 | spin_unlock_irqrestore(&priv->lock, flags); | |
d44d9ab7 | 194 | dev_dbg(&port->dev, "%s - write limit hit\n", __func__); |
648d4e16 GKH |
195 | return 0; |
196 | } | |
197 | priv->outstanding_urbs++; | |
198 | spin_unlock_irqrestore(&priv->lock, flags); | |
199 | ||
200 | buffer = kmalloc(count, GFP_ATOMIC); | |
201 | if (!buffer) { | |
648d4e16 GKH |
202 | count = -ENOMEM; |
203 | goto error_no_buffer; | |
204 | } | |
205 | ||
206 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
207 | if (!urb) { | |
648d4e16 GKH |
208 | count = -ENOMEM; |
209 | goto error_no_urb; | |
210 | } | |
211 | ||
212 | memcpy(buffer, buf, count); | |
213 | ||
59d33f2f | 214 | usb_serial_debug_data(&port->dev, __func__, count, buffer); |
648d4e16 | 215 | |
cd8c5053 | 216 | /* The connected devices do not have a bulk write endpoint, |
309a0579 | 217 | * to transmit data to de barcode device the control endpoint is used */ |
e681286d | 218 | dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); |
b0795bbf | 219 | if (!dr) { |
b0795bbf | 220 | count = -ENOMEM; |
acbf0e52 | 221 | goto error_no_dr; |
b0795bbf | 222 | } |
309a0579 MJ |
223 | |
224 | dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT; | |
225 | dr->bRequest = 0x01; | |
226 | dr->wValue = 0; | |
227 | dr->wIndex = 0; | |
228 | dr->wLength = cpu_to_le16(count); | |
229 | ||
230 | usb_fill_control_urb(urb, serial->dev, | |
231 | usb_sndctrlpipe(serial->dev, 0), | |
232 | (unsigned char *)dr, buffer, count, | |
e32d82bc | 233 | opticon_write_control_callback, port); |
648d4e16 GKH |
234 | |
235 | /* send it down the pipe */ | |
236 | status = usb_submit_urb(urb, GFP_ATOMIC); | |
237 | if (status) { | |
238 | dev_err(&port->dev, | |
309a0579 | 239 | "%s - usb_submit_urb(write endpoint) failed status = %d\n", |
648d4e16 GKH |
240 | __func__, status); |
241 | count = status; | |
242 | goto error; | |
243 | } | |
244 | ||
245 | /* we are done with this urb, so let the host driver | |
246 | * really free it when it is finished with it */ | |
247 | usb_free_urb(urb); | |
248 | ||
249 | return count; | |
250 | error: | |
acbf0e52 JH |
251 | kfree(dr); |
252 | error_no_dr: | |
648d4e16 GKH |
253 | usb_free_urb(urb); |
254 | error_no_urb: | |
255 | kfree(buffer); | |
256 | error_no_buffer: | |
257 | spin_lock_irqsave(&priv->lock, flags); | |
258 | --priv->outstanding_urbs; | |
259 | spin_unlock_irqrestore(&priv->lock, flags); | |
260 | return count; | |
261 | } | |
262 | ||
263 | static int opticon_write_room(struct tty_struct *tty) | |
264 | { | |
265 | struct usb_serial_port *port = tty->driver_data; | |
70d25eee | 266 | struct opticon_private *priv = usb_get_serial_port_data(port); |
648d4e16 GKH |
267 | unsigned long flags; |
268 | ||
648d4e16 GKH |
269 | /* |
270 | * We really can take almost anything the user throws at us | |
271 | * but let's pick a nice big number to tell the tty | |
272 | * layer that we have lots of free space, unless we don't. | |
273 | */ | |
274 | spin_lock_irqsave(&priv->lock, flags); | |
275 | if (priv->outstanding_urbs > URB_UPPER_LIMIT * 2 / 3) { | |
276 | spin_unlock_irqrestore(&priv->lock, flags); | |
d44d9ab7 | 277 | dev_dbg(&port->dev, "%s - write limit hit\n", __func__); |
648d4e16 GKH |
278 | return 0; |
279 | } | |
280 | spin_unlock_irqrestore(&priv->lock, flags); | |
281 | ||
282 | return 2048; | |
283 | } | |
284 | ||
60b33c13 | 285 | static int opticon_tiocmget(struct tty_struct *tty) |
faac64ad GKH |
286 | { |
287 | struct usb_serial_port *port = tty->driver_data; | |
70d25eee | 288 | struct opticon_private *priv = usb_get_serial_port_data(port); |
faac64ad GKH |
289 | unsigned long flags; |
290 | int result = 0; | |
291 | ||
faac64ad GKH |
292 | spin_lock_irqsave(&priv->lock, flags); |
293 | if (priv->rts) | |
309a0579 MJ |
294 | result |= TIOCM_RTS; |
295 | if (priv->cts) | |
296 | result |= TIOCM_CTS; | |
faac64ad GKH |
297 | spin_unlock_irqrestore(&priv->lock, flags); |
298 | ||
d44d9ab7 | 299 | dev_dbg(&port->dev, "%s - %x\n", __func__, result); |
faac64ad GKH |
300 | return result; |
301 | } | |
302 | ||
4acfaf82 | 303 | static int opticon_tiocmset(struct tty_struct *tty, |
309a0579 MJ |
304 | unsigned int set, unsigned int clear) |
305 | { | |
306 | struct usb_serial_port *port = tty->driver_data; | |
70d25eee | 307 | struct opticon_private *priv = usb_get_serial_port_data(port); |
309a0579 MJ |
308 | unsigned long flags; |
309 | bool rts; | |
310 | bool changed = false; | |
81d5a672 | 311 | int ret; |
309a0579 | 312 | |
309a0579 MJ |
313 | /* We only support RTS so we only handle that */ |
314 | spin_lock_irqsave(&priv->lock, flags); | |
315 | ||
316 | rts = priv->rts; | |
317 | if (set & TIOCM_RTS) | |
318 | priv->rts = true; | |
319 | if (clear & TIOCM_RTS) | |
320 | priv->rts = false; | |
321 | changed = rts ^ priv->rts; | |
322 | spin_unlock_irqrestore(&priv->lock, flags); | |
323 | ||
324 | if (!changed) | |
325 | return 0; | |
326 | ||
94bcef62 JH |
327 | ret = send_control_msg(port, CONTROL_RTS, !rts); |
328 | if (ret) | |
329 | return usb_translate_errors(ret); | |
81d5a672 | 330 | |
94bcef62 | 331 | return 0; |
309a0579 MJ |
332 | } |
333 | ||
56be1a17 | 334 | static int get_serial_info(struct usb_serial_port *port, |
faac64ad GKH |
335 | struct serial_struct __user *serial) |
336 | { | |
337 | struct serial_struct tmp; | |
338 | ||
faac64ad GKH |
339 | memset(&tmp, 0x00, sizeof(tmp)); |
340 | ||
341 | /* fake emulate a 16550 uart to make userspace code happy */ | |
342 | tmp.type = PORT_16550A; | |
e5b1e206 | 343 | tmp.line = port->minor; |
faac64ad GKH |
344 | tmp.port = 0; |
345 | tmp.irq = 0; | |
faac64ad GKH |
346 | tmp.xmit_fifo_size = 1024; |
347 | tmp.baud_base = 9600; | |
348 | tmp.close_delay = 5*HZ; | |
349 | tmp.closing_wait = 30*HZ; | |
350 | ||
351 | if (copy_to_user(serial, &tmp, sizeof(*serial))) | |
352 | return -EFAULT; | |
353 | return 0; | |
354 | } | |
355 | ||
00a0d0d6 | 356 | static int opticon_ioctl(struct tty_struct *tty, |
faac64ad GKH |
357 | unsigned int cmd, unsigned long arg) |
358 | { | |
359 | struct usb_serial_port *port = tty->driver_data; | |
faac64ad | 360 | |
faac64ad GKH |
361 | switch (cmd) { |
362 | case TIOCGSERIAL: | |
56be1a17 | 363 | return get_serial_info(port, |
faac64ad GKH |
364 | (struct serial_struct __user *)arg); |
365 | } | |
366 | ||
367 | return -ENOIOCTLCMD; | |
368 | } | |
369 | ||
70d25eee JH |
370 | static int opticon_port_probe(struct usb_serial_port *port) |
371 | { | |
70d25eee | 372 | struct opticon_private *priv; |
70d25eee | 373 | |
57262b82 | 374 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
70d25eee | 375 | if (!priv) |
57262b82 | 376 | return -ENOMEM; |
70d25eee | 377 | |
57262b82 | 378 | spin_lock_init(&priv->lock); |
0b8718a2 | 379 | |
70d25eee | 380 | usb_set_serial_port_data(port, priv); |
57262b82 | 381 | |
70d25eee | 382 | return 0; |
57262b82 GKH |
383 | } |
384 | ||
70d25eee | 385 | static int opticon_port_remove(struct usb_serial_port *port) |
f9c99bb8 | 386 | { |
70d25eee | 387 | struct opticon_private *priv = usb_get_serial_port_data(port); |
f9c99bb8 | 388 | |
57262b82 | 389 | kfree(priv); |
70d25eee JH |
390 | |
391 | return 0; | |
57262b82 GKH |
392 | } |
393 | ||
57262b82 GKH |
394 | static struct usb_serial_driver opticon_device = { |
395 | .driver = { | |
396 | .owner = THIS_MODULE, | |
397 | .name = "opticon", | |
398 | }, | |
399 | .id_table = id_table, | |
57262b82 | 400 | .num_ports = 1, |
5e5b6444 | 401 | .num_bulk_in = 1, |
333396fc | 402 | .bulk_in_size = 256, |
70d25eee JH |
403 | .port_probe = opticon_port_probe, |
404 | .port_remove = opticon_port_remove, | |
57262b82 | 405 | .open = opticon_open, |
648d4e16 GKH |
406 | .write = opticon_write, |
407 | .write_room = opticon_write_room, | |
7a6ee2b0 JH |
408 | .throttle = usb_serial_generic_throttle, |
409 | .unthrottle = usb_serial_generic_unthrottle, | |
faac64ad GKH |
410 | .ioctl = opticon_ioctl, |
411 | .tiocmget = opticon_tiocmget, | |
309a0579 | 412 | .tiocmset = opticon_tiocmset, |
7a6ee2b0 | 413 | .process_read_urb = opticon_process_read_urb, |
57262b82 GKH |
414 | }; |
415 | ||
f667ddad AS |
416 | static struct usb_serial_driver * const serial_drivers[] = { |
417 | &opticon_device, NULL | |
418 | }; | |
419 | ||
68e24113 | 420 | module_usb_serial_driver(serial_drivers, id_table); |
57262b82 | 421 | |
309a0579 | 422 | MODULE_DESCRIPTION(DRIVER_DESC); |
57262b82 | 423 | MODULE_LICENSE("GPL"); |