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1/*
2 Some of this code is credited to Linux USB open source files that are
3 distributed with Linux.
4
5 Copyright: 2007 Metrologic Instruments. All rights reserved.
6 Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
7*/
8
9#include <linux/kernel.h>
10#include <linux/tty.h>
11#include <linux/module.h>
12#include <linux/usb.h>
13#include <linux/errno.h>
14#include <linux/slab.h>
15#include <linux/tty_driver.h>
16#include <linux/tty_flip.h>
17#include <linux/moduleparam.h>
18#include <linux/spinlock.h>
19#include <linux/uaccess.h>
20#include <linux/usb/serial.h>
21
22#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
23
24/* Product information. */
25#define FOCUS_VENDOR_ID 0x0C2E
26#define FOCUS_PRODUCT_ID_BI 0x0720
27#define FOCUS_PRODUCT_ID_UNI 0x0700
28
29#define METROUSB_SET_REQUEST_TYPE 0x40
30#define METROUSB_SET_MODEM_CTRL_REQUEST 10
31#define METROUSB_SET_BREAK_REQUEST 0x40
32#define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
33#define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
34#define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
35#define WDR_TIMEOUT 5000 /* default urb timeout. */
36
37/* Private data structure. */
38struct metrousb_private {
39 spinlock_t lock;
40 int throttled;
41 unsigned long control_state;
42};
43
44/* Device table list. */
45static const struct usb_device_id id_table[] = {
46 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
47 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
48 { }, /* Terminating entry. */
49};
50MODULE_DEVICE_TABLE(usb, id_table);
51
52/* UNI-Directional mode commands for device configure */
53#define UNI_CMD_OPEN 0x80
54#define UNI_CMD_CLOSE 0xFF
55
56static inline int metrousb_is_unidirectional_mode(struct usb_serial_port *port)
57{
58 __u16 product_id = le16_to_cpu(
59 port->serial->dev->descriptor.idProduct);
60
61 return product_id == FOCUS_PRODUCT_ID_UNI;
62}
63
64static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
65{
66 int ret;
67 int actual_len;
68 u8 *buffer_cmd = NULL;
69
70 if (!metrousb_is_unidirectional_mode(port))
71 return 0;
72
73 buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
74 if (!buffer_cmd)
75 return -ENOMEM;
76
77 *buffer_cmd = cmd;
78
79 ret = usb_interrupt_msg(port->serial->dev,
80 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
81 buffer_cmd, sizeof(cmd),
82 &actual_len, USB_CTRL_SET_TIMEOUT);
83
84 kfree(buffer_cmd);
85
86 if (ret < 0)
87 return ret;
88 else if (actual_len != sizeof(cmd))
89 return -EIO;
90 return 0;
91}
92
93static void metrousb_read_int_callback(struct urb *urb)
94{
95 struct usb_serial_port *port = urb->context;
96 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
97 unsigned char *data = urb->transfer_buffer;
98 int throttled = 0;
99 int result = 0;
100 unsigned long flags = 0;
101
102 dev_dbg(&port->dev, "%s\n", __func__);
103
104 switch (urb->status) {
105 case 0:
106 /* Success status, read from the port. */
107 break;
108 case -ECONNRESET:
109 case -ENOENT:
110 case -ESHUTDOWN:
111 /* urb has been terminated. */
112 dev_dbg(&port->dev,
113 "%s - urb shutting down, error code=%d\n",
114 __func__, urb->status);
115 return;
116 default:
117 dev_dbg(&port->dev,
118 "%s - non-zero urb received, error code=%d\n",
119 __func__, urb->status);
120 goto exit;
121 }
122
123
124 /* Set the data read from the usb port into the serial port buffer. */
125 if (urb->actual_length) {
126 /* Loop through the data copying each byte to the tty layer. */
127 tty_insert_flip_string(&port->port, data, urb->actual_length);
128
129 /* Force the data to the tty layer. */
130 tty_flip_buffer_push(&port->port);
131 }
132
133 /* Set any port variables. */
134 spin_lock_irqsave(&metro_priv->lock, flags);
135 throttled = metro_priv->throttled;
136 spin_unlock_irqrestore(&metro_priv->lock, flags);
137
138 /* Continue trying to read if set. */
139 if (!throttled) {
140 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
141 usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
142 port->interrupt_in_urb->transfer_buffer,
143 port->interrupt_in_urb->transfer_buffer_length,
144 metrousb_read_int_callback, port, 1);
145
146 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
147
148 if (result)
149 dev_err(&port->dev,
150 "%s - failed submitting interrupt in urb, error code=%d\n",
151 __func__, result);
152 }
153 return;
154
155exit:
156 /* Try to resubmit the urb. */
157 result = usb_submit_urb(urb, GFP_ATOMIC);
158 if (result)
159 dev_err(&port->dev,
160 "%s - failed submitting interrupt in urb, error code=%d\n",
161 __func__, result);
162}
163
164static void metrousb_write_int_callback(struct urb *urb)
165{
166 struct usb_serial_port *port = urb->context;
167
168 dev_warn(&port->dev, "%s not implemented yet.\n",
169 __func__);
170}
171
172static void metrousb_cleanup(struct usb_serial_port *port)
173{
174 dev_dbg(&port->dev, "%s\n", __func__);
175
176 usb_unlink_urb(port->interrupt_in_urb);
177 usb_kill_urb(port->interrupt_in_urb);
178
179 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
180}
181
182static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
183{
184 struct usb_serial *serial = port->serial;
185 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
186 unsigned long flags = 0;
187 int result = 0;
188
189 dev_dbg(&port->dev, "%s\n", __func__);
190
191 /* Make sure the urb is initialized. */
192 if (!port->interrupt_in_urb) {
193 dev_err(&port->dev, "%s - interrupt urb not initialized\n",
194 __func__);
195 return -ENODEV;
196 }
197
198 /* Set the private data information for the port. */
199 spin_lock_irqsave(&metro_priv->lock, flags);
200 metro_priv->control_state = 0;
201 metro_priv->throttled = 0;
202 spin_unlock_irqrestore(&metro_priv->lock, flags);
203
204 /* Clear the urb pipe. */
205 usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
206
207 /* Start reading from the device */
208 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
209 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
210 port->interrupt_in_urb->transfer_buffer,
211 port->interrupt_in_urb->transfer_buffer_length,
212 metrousb_read_int_callback, port, 1);
213 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
214
215 if (result) {
216 dev_err(&port->dev,
217 "%s - failed submitting interrupt in urb, error code=%d\n",
218 __func__, result);
219 goto exit;
220 }
221
222 /* Send activate cmd to device */
223 result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
224 if (result) {
225 dev_err(&port->dev,
226 "%s - failed to configure device, error code=%d\n",
227 __func__, result);
228 goto exit;
229 }
230
231 dev_dbg(&port->dev, "%s - port open\n", __func__);
232exit:
233 return result;
234}
235
236static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
237{
238 int retval = 0;
239 unsigned char mcr = METROUSB_MCR_NONE;
240
241 dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
242 __func__, control_state);
243
244 /* Set the modem control value. */
245 if (control_state & TIOCM_DTR)
246 mcr |= METROUSB_MCR_DTR;
247 if (control_state & TIOCM_RTS)
248 mcr |= METROUSB_MCR_RTS;
249
250 /* Send the command to the usb port. */
251 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
252 METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
253 control_state, 0, NULL, 0, WDR_TIMEOUT);
254 if (retval < 0)
255 dev_err(&serial->dev->dev,
256 "%s - set modem ctrl=0x%x failed, error code=%d\n",
257 __func__, mcr, retval);
258
259 return retval;
260}
261
262static int metrousb_port_probe(struct usb_serial_port *port)
263{
264 struct metrousb_private *metro_priv;
265
266 metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL);
267 if (!metro_priv)
268 return -ENOMEM;
269
270 spin_lock_init(&metro_priv->lock);
271
272 usb_set_serial_port_data(port, metro_priv);
273
274 return 0;
275}
276
277static int metrousb_port_remove(struct usb_serial_port *port)
278{
279 struct metrousb_private *metro_priv;
280
281 metro_priv = usb_get_serial_port_data(port);
282 kfree(metro_priv);
283
284 return 0;
285}
286
287static void metrousb_throttle(struct tty_struct *tty)
288{
289 struct usb_serial_port *port = tty->driver_data;
290 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
291 unsigned long flags = 0;
292
293 dev_dbg(tty->dev, "%s\n", __func__);
294
295 /* Set the private information for the port to stop reading data. */
296 spin_lock_irqsave(&metro_priv->lock, flags);
297 metro_priv->throttled = 1;
298 spin_unlock_irqrestore(&metro_priv->lock, flags);
299}
300
301static int metrousb_tiocmget(struct tty_struct *tty)
302{
303 unsigned long control_state = 0;
304 struct usb_serial_port *port = tty->driver_data;
305 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
306 unsigned long flags = 0;
307
308 dev_dbg(tty->dev, "%s\n", __func__);
309
310 spin_lock_irqsave(&metro_priv->lock, flags);
311 control_state = metro_priv->control_state;
312 spin_unlock_irqrestore(&metro_priv->lock, flags);
313
314 return control_state;
315}
316
317static int metrousb_tiocmset(struct tty_struct *tty,
318 unsigned int set, unsigned int clear)
319{
320 struct usb_serial_port *port = tty->driver_data;
321 struct usb_serial *serial = port->serial;
322 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
323 unsigned long flags = 0;
324 unsigned long control_state = 0;
325
326 dev_dbg(tty->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);
327
328 spin_lock_irqsave(&metro_priv->lock, flags);
329 control_state = metro_priv->control_state;
330
331 /* Set the RTS and DTR values. */
332 if (set & TIOCM_RTS)
333 control_state |= TIOCM_RTS;
334 if (set & TIOCM_DTR)
335 control_state |= TIOCM_DTR;
336 if (clear & TIOCM_RTS)
337 control_state &= ~TIOCM_RTS;
338 if (clear & TIOCM_DTR)
339 control_state &= ~TIOCM_DTR;
340
341 metro_priv->control_state = control_state;
342 spin_unlock_irqrestore(&metro_priv->lock, flags);
343 return metrousb_set_modem_ctrl(serial, control_state);
344}
345
346static void metrousb_unthrottle(struct tty_struct *tty)
347{
348 struct usb_serial_port *port = tty->driver_data;
349 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
350 unsigned long flags = 0;
351 int result = 0;
352
353 dev_dbg(tty->dev, "%s\n", __func__);
354
355 /* Set the private information for the port to resume reading data. */
356 spin_lock_irqsave(&metro_priv->lock, flags);
357 metro_priv->throttled = 0;
358 spin_unlock_irqrestore(&metro_priv->lock, flags);
359
360 /* Submit the urb to read from the port. */
361 port->interrupt_in_urb->dev = port->serial->dev;
362 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
363 if (result)
364 dev_err(tty->dev,
365 "failed submitting interrupt in urb error code=%d\n",
366 result);
367}
368
369static struct usb_serial_driver metrousb_device = {
370 .driver = {
371 .owner = THIS_MODULE,
372 .name = "metro-usb",
373 },
374 .description = "Metrologic USB to Serial",
375 .id_table = id_table,
376 .num_ports = 1,
377 .open = metrousb_open,
378 .close = metrousb_cleanup,
379 .read_int_callback = metrousb_read_int_callback,
380 .write_int_callback = metrousb_write_int_callback,
381 .port_probe = metrousb_port_probe,
382 .port_remove = metrousb_port_remove,
383 .throttle = metrousb_throttle,
384 .unthrottle = metrousb_unthrottle,
385 .tiocmget = metrousb_tiocmget,
386 .tiocmset = metrousb_tiocmset,
387};
388
389static struct usb_serial_driver * const serial_drivers[] = {
390 &metrousb_device,
391 NULL,
392};
393
394module_usb_serial_driver(serial_drivers, id_table);
395
396MODULE_LICENSE("GPL");
397MODULE_AUTHOR("Philip Nicastro");
398MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
399MODULE_DESCRIPTION(DRIVER_DESC);
1/*
2 Some of this code is credited to Linux USB open source files that are
3 distributed with Linux.
4
5 Copyright: 2007 Metrologic Instruments. All rights reserved.
6 Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
7*/
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/tty.h>
12#include <linux/module.h>
13#include <linux/usb.h>
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/tty_driver.h>
17#include <linux/tty_flip.h>
18#include <linux/moduleparam.h>
19#include <linux/spinlock.h>
20#include <linux/uaccess.h>
21#include <linux/usb/serial.h>
22
23/* Version Information */
24#define DRIVER_VERSION "v1.2.0.0"
25#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
26
27/* Product information. */
28#define FOCUS_VENDOR_ID 0x0C2E
29#define FOCUS_PRODUCT_ID_BI 0x0720
30#define FOCUS_PRODUCT_ID_UNI 0x0700
31
32#define METROUSB_SET_REQUEST_TYPE 0x40
33#define METROUSB_SET_MODEM_CTRL_REQUEST 10
34#define METROUSB_SET_BREAK_REQUEST 0x40
35#define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
36#define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
37#define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
38#define WDR_TIMEOUT 5000 /* default urb timeout. */
39
40/* Private data structure. */
41struct metrousb_private {
42 spinlock_t lock;
43 int throttled;
44 unsigned long control_state;
45};
46
47/* Device table list. */
48static struct usb_device_id id_table[] = {
49 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
50 { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
51 { }, /* Terminating entry. */
52};
53MODULE_DEVICE_TABLE(usb, id_table);
54
55/* Input parameter constants. */
56static bool debug;
57
58/* UNI-Directional mode commands for device configure */
59#define UNI_CMD_OPEN 0x80
60#define UNI_CMD_CLOSE 0xFF
61
62inline int metrousb_is_unidirectional_mode(struct usb_serial_port *port)
63{
64 __u16 product_id = le16_to_cpu(
65 port->serial->dev->descriptor.idProduct);
66
67 return product_id == FOCUS_PRODUCT_ID_UNI;
68}
69
70static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
71{
72 int ret;
73 int actual_len;
74 u8 *buffer_cmd = NULL;
75
76 if (!metrousb_is_unidirectional_mode(port))
77 return 0;
78
79 buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
80 if (!buffer_cmd)
81 return -ENOMEM;
82
83 *buffer_cmd = cmd;
84
85 ret = usb_interrupt_msg(port->serial->dev,
86 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
87 buffer_cmd, sizeof(cmd),
88 &actual_len, USB_CTRL_SET_TIMEOUT);
89
90 kfree(buffer_cmd);
91
92 if (ret < 0)
93 return ret;
94 else if (actual_len != sizeof(cmd))
95 return -EIO;
96 return 0;
97}
98
99static void metrousb_read_int_callback(struct urb *urb)
100{
101 struct usb_serial_port *port = urb->context;
102 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
103 struct tty_struct *tty;
104 unsigned char *data = urb->transfer_buffer;
105 int throttled = 0;
106 int result = 0;
107 unsigned long flags = 0;
108
109 dev_dbg(&port->dev, "%s\n", __func__);
110
111 switch (urb->status) {
112 case 0:
113 /* Success status, read from the port. */
114 break;
115 case -ECONNRESET:
116 case -ENOENT:
117 case -ESHUTDOWN:
118 /* urb has been terminated. */
119 dev_dbg(&port->dev,
120 "%s - urb shutting down, error code=%d\n",
121 __func__, urb->status);
122 return;
123 default:
124 dev_dbg(&port->dev,
125 "%s - non-zero urb received, error code=%d\n",
126 __func__, urb->status);
127 goto exit;
128 }
129
130
131 /* Set the data read from the usb port into the serial port buffer. */
132 tty = tty_port_tty_get(&port->port);
133 if (!tty) {
134 dev_err(&port->dev, "%s - bad tty pointer - exiting\n",
135 __func__);
136 return;
137 }
138
139 if (tty && urb->actual_length) {
140 /* Loop through the data copying each byte to the tty layer. */
141 tty_insert_flip_string(tty, data, urb->actual_length);
142
143 /* Force the data to the tty layer. */
144 tty_flip_buffer_push(tty);
145 }
146 tty_kref_put(tty);
147
148 /* Set any port variables. */
149 spin_lock_irqsave(&metro_priv->lock, flags);
150 throttled = metro_priv->throttled;
151 spin_unlock_irqrestore(&metro_priv->lock, flags);
152
153 /* Continue trying to read if set. */
154 if (!throttled) {
155 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
156 usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
157 port->interrupt_in_urb->transfer_buffer,
158 port->interrupt_in_urb->transfer_buffer_length,
159 metrousb_read_int_callback, port, 1);
160
161 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
162
163 if (result)
164 dev_err(&port->dev,
165 "%s - failed submitting interrupt in urb, error code=%d\n",
166 __func__, result);
167 }
168 return;
169
170exit:
171 /* Try to resubmit the urb. */
172 result = usb_submit_urb(urb, GFP_ATOMIC);
173 if (result)
174 dev_err(&port->dev,
175 "%s - failed submitting interrupt in urb, error code=%d\n",
176 __func__, result);
177}
178
179static void metrousb_write_int_callback(struct urb *urb)
180{
181 struct usb_serial_port *port = urb->context;
182
183 dev_warn(&port->dev, "%s not implemented yet.\n",
184 __func__);
185}
186
187static void metrousb_cleanup(struct usb_serial_port *port)
188{
189 dev_dbg(&port->dev, "%s\n", __func__);
190
191 if (port->serial->dev) {
192 /* Shutdown any interrupt in urbs. */
193 if (port->interrupt_in_urb) {
194 usb_unlink_urb(port->interrupt_in_urb);
195 usb_kill_urb(port->interrupt_in_urb);
196 }
197
198 /* Send deactivate cmd to device */
199 metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
200 }
201}
202
203static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
204{
205 struct usb_serial *serial = port->serial;
206 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
207 unsigned long flags = 0;
208 int result = 0;
209
210 dev_dbg(&port->dev, "%s\n", __func__);
211
212 /* Make sure the urb is initialized. */
213 if (!port->interrupt_in_urb) {
214 dev_err(&port->dev, "%s - interrupt urb not initialized\n",
215 __func__);
216 return -ENODEV;
217 }
218
219 /* Set the private data information for the port. */
220 spin_lock_irqsave(&metro_priv->lock, flags);
221 metro_priv->control_state = 0;
222 metro_priv->throttled = 0;
223 spin_unlock_irqrestore(&metro_priv->lock, flags);
224
225 /* Clear the urb pipe. */
226 usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
227
228 /* Start reading from the device */
229 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
230 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
231 port->interrupt_in_urb->transfer_buffer,
232 port->interrupt_in_urb->transfer_buffer_length,
233 metrousb_read_int_callback, port, 1);
234 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
235
236 if (result) {
237 dev_err(&port->dev,
238 "%s - failed submitting interrupt in urb, error code=%d\n",
239 __func__, result);
240 goto exit;
241 }
242
243 /* Send activate cmd to device */
244 result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
245 if (result) {
246 dev_err(&port->dev,
247 "%s - failed to configure device for port number=%d, error code=%d\n",
248 __func__, port->number, result);
249 goto exit;
250 }
251
252 dev_dbg(&port->dev, "%s - port open\n", __func__);
253exit:
254 return result;
255}
256
257static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
258{
259 int retval = 0;
260 unsigned char mcr = METROUSB_MCR_NONE;
261
262 dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
263 __func__, control_state);
264
265 /* Set the modem control value. */
266 if (control_state & TIOCM_DTR)
267 mcr |= METROUSB_MCR_DTR;
268 if (control_state & TIOCM_RTS)
269 mcr |= METROUSB_MCR_RTS;
270
271 /* Send the command to the usb port. */
272 retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
273 METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
274 control_state, 0, NULL, 0, WDR_TIMEOUT);
275 if (retval < 0)
276 dev_err(&serial->dev->dev,
277 "%s - set modem ctrl=0x%x failed, error code=%d\n",
278 __func__, mcr, retval);
279
280 return retval;
281}
282
283static void metrousb_shutdown(struct usb_serial *serial)
284{
285 int i = 0;
286
287 dev_dbg(&serial->dev->dev, "%s\n", __func__);
288
289 /* Stop reading and writing on all ports. */
290 for (i = 0; i < serial->num_ports; ++i) {
291 /* Close any open urbs. */
292 metrousb_cleanup(serial->port[i]);
293
294 /* Free memory. */
295 kfree(usb_get_serial_port_data(serial->port[i]));
296 usb_set_serial_port_data(serial->port[i], NULL);
297
298 dev_dbg(&serial->dev->dev, "%s - freed port number=%d\n",
299 __func__, serial->port[i]->number);
300 }
301}
302
303static int metrousb_startup(struct usb_serial *serial)
304{
305 struct metrousb_private *metro_priv;
306 struct usb_serial_port *port;
307 int i = 0;
308
309 dev_dbg(&serial->dev->dev, "%s\n", __func__);
310
311 /* Loop through the serial ports setting up the private structures.
312 * Currently we only use one port. */
313 for (i = 0; i < serial->num_ports; ++i) {
314 port = serial->port[i];
315
316 /* Declare memory. */
317 metro_priv = kzalloc(sizeof(struct metrousb_private), GFP_KERNEL);
318 if (!metro_priv)
319 return -ENOMEM;
320
321 /* Initialize memory. */
322 spin_lock_init(&metro_priv->lock);
323 usb_set_serial_port_data(port, metro_priv);
324
325 dev_dbg(&serial->dev->dev, "%s - port number=%d\n ",
326 __func__, port->number);
327 }
328
329 return 0;
330}
331
332static void metrousb_throttle(struct tty_struct *tty)
333{
334 struct usb_serial_port *port = tty->driver_data;
335 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
336 unsigned long flags = 0;
337
338 dev_dbg(tty->dev, "%s\n", __func__);
339
340 /* Set the private information for the port to stop reading data. */
341 spin_lock_irqsave(&metro_priv->lock, flags);
342 metro_priv->throttled = 1;
343 spin_unlock_irqrestore(&metro_priv->lock, flags);
344}
345
346static int metrousb_tiocmget(struct tty_struct *tty)
347{
348 unsigned long control_state = 0;
349 struct usb_serial_port *port = tty->driver_data;
350 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
351 unsigned long flags = 0;
352
353 dev_dbg(tty->dev, "%s\n", __func__);
354
355 spin_lock_irqsave(&metro_priv->lock, flags);
356 control_state = metro_priv->control_state;
357 spin_unlock_irqrestore(&metro_priv->lock, flags);
358
359 return control_state;
360}
361
362static int metrousb_tiocmset(struct tty_struct *tty,
363 unsigned int set, unsigned int clear)
364{
365 struct usb_serial_port *port = tty->driver_data;
366 struct usb_serial *serial = port->serial;
367 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
368 unsigned long flags = 0;
369 unsigned long control_state = 0;
370
371 dev_dbg(tty->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);
372
373 spin_lock_irqsave(&metro_priv->lock, flags);
374 control_state = metro_priv->control_state;
375
376 /* Set the RTS and DTR values. */
377 if (set & TIOCM_RTS)
378 control_state |= TIOCM_RTS;
379 if (set & TIOCM_DTR)
380 control_state |= TIOCM_DTR;
381 if (clear & TIOCM_RTS)
382 control_state &= ~TIOCM_RTS;
383 if (clear & TIOCM_DTR)
384 control_state &= ~TIOCM_DTR;
385
386 metro_priv->control_state = control_state;
387 spin_unlock_irqrestore(&metro_priv->lock, flags);
388 return metrousb_set_modem_ctrl(serial, control_state);
389}
390
391static void metrousb_unthrottle(struct tty_struct *tty)
392{
393 struct usb_serial_port *port = tty->driver_data;
394 struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
395 unsigned long flags = 0;
396 int result = 0;
397
398 dev_dbg(tty->dev, "%s\n", __func__);
399
400 /* Set the private information for the port to resume reading data. */
401 spin_lock_irqsave(&metro_priv->lock, flags);
402 metro_priv->throttled = 0;
403 spin_unlock_irqrestore(&metro_priv->lock, flags);
404
405 /* Submit the urb to read from the port. */
406 port->interrupt_in_urb->dev = port->serial->dev;
407 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
408 if (result)
409 dev_err(tty->dev,
410 "failed submitting interrupt in urb error code=%d\n",
411 result);
412}
413
414static struct usb_serial_driver metrousb_device = {
415 .driver = {
416 .owner = THIS_MODULE,
417 .name = "metro-usb",
418 },
419 .description = "Metrologic USB to Serial",
420 .id_table = id_table,
421 .num_ports = 1,
422 .open = metrousb_open,
423 .close = metrousb_cleanup,
424 .read_int_callback = metrousb_read_int_callback,
425 .write_int_callback = metrousb_write_int_callback,
426 .attach = metrousb_startup,
427 .release = metrousb_shutdown,
428 .throttle = metrousb_throttle,
429 .unthrottle = metrousb_unthrottle,
430 .tiocmget = metrousb_tiocmget,
431 .tiocmset = metrousb_tiocmset,
432};
433
434static struct usb_serial_driver * const serial_drivers[] = {
435 &metrousb_device,
436 NULL,
437};
438
439module_usb_serial_driver(serial_drivers, id_table);
440
441MODULE_LICENSE("GPL");
442MODULE_AUTHOR("Philip Nicastro");
443MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
444MODULE_DESCRIPTION(DRIVER_DESC);
445
446/* Module input parameters */
447module_param(debug, bool, S_IRUGO | S_IWUSR);
448MODULE_PARM_DESC(debug, "Print debug info (bool 1=on, 0=off)");