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14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/slab.h>
19#include <linux/tty.h>
20#include <linux/console.h>
21#include <linux/serial.h>
22#include <linux/usb.h>
23#include <linux/usb/serial.h>
24
25struct usbcons_info {
26 int magic;
27 int break_flag;
28 struct usb_serial_port *port;
29};
30
31static struct usbcons_info usbcons_info;
32static struct console usbcons;
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56static int usb_console_setup(struct console *co, char *options)
57{
58 struct usbcons_info *info = &usbcons_info;
59 int baud = 9600;
60 int bits = 8;
61 int parity = 'n';
62 int doflow = 0;
63 int cflag = CREAD | HUPCL | CLOCAL;
64 char *s;
65 struct usb_serial *serial;
66 struct usb_serial_port *port;
67 int retval;
68 struct tty_struct *tty = NULL;
69 struct ktermios dummy;
70
71 if (options) {
72 baud = simple_strtoul(options, NULL, 10);
73 s = options;
74 while (*s >= '0' && *s <= '9')
75 s++;
76 if (*s)
77 parity = *s++;
78 if (*s)
79 bits = *s++ - '0';
80 if (*s)
81 doflow = (*s++ == 'r');
82 }
83
84
85 if (baud == 0)
86 baud = 9600;
87
88 switch (bits) {
89 case 7:
90 cflag |= CS7;
91 break;
92 default:
93 case 8:
94 cflag |= CS8;
95 break;
96 }
97 switch (parity) {
98 case 'o': case 'O':
99 cflag |= PARODD;
100 break;
101 case 'e': case 'E':
102 cflag |= PARENB;
103 break;
104 }
105 co->cflag = cflag;
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111 serial = usb_serial_get_by_index(co->index);
112 if (serial == NULL) {
113
114 pr_err("No USB device connected to ttyUSB%i\n", co->index);
115 return -ENODEV;
116 }
117
118 retval = usb_autopm_get_interface(serial->interface);
119 if (retval)
120 goto error_get_interface;
121
122 port = serial->port[co->index - serial->minor];
123 tty_port_tty_set(&port->port, NULL);
124
125 info->port = port;
126
127 ++port->port.count;
128 if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) {
129 if (serial->type->set_termios) {
130
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134
135 tty = kzalloc(sizeof(*tty), GFP_KERNEL);
136 if (!tty) {
137 retval = -ENOMEM;
138 dev_err(&port->dev, "no more memory\n");
139 goto reset_open_count;
140 }
141 kref_init(&tty->kref);
142 tty_port_tty_set(&port->port, tty);
143 tty->driver = usb_serial_tty_driver;
144 tty->index = co->index;
145 if (tty_init_termios(tty)) {
146 retval = -ENOMEM;
147 dev_err(&port->dev, "no more memory\n");
148 goto free_tty;
149 }
150 }
151
152
153
154 if (serial->type->open)
155 retval = serial->type->open(NULL, port);
156 else
157 retval = usb_serial_generic_open(NULL, port);
158
159 if (retval) {
160 dev_err(&port->dev, "could not open USB console port\n");
161 goto fail;
162 }
163
164 if (serial->type->set_termios) {
165 tty->termios.c_cflag = cflag;
166 tty_termios_encode_baud_rate(&tty->termios, baud, baud);
167 memset(&dummy, 0, sizeof(struct ktermios));
168 serial->type->set_termios(tty, port, &dummy);
169
170 tty_port_tty_set(&port->port, NULL);
171 kfree(tty);
172 }
173 set_bit(ASYNCB_INITIALIZED, &port->port.flags);
174 }
175
176
177 --port->port.count;
178
179
180 port->port.console = 1;
181
182 mutex_unlock(&serial->disc_mutex);
183 return retval;
184
185 fail:
186 tty_port_tty_set(&port->port, NULL);
187 free_tty:
188 kfree(tty);
189 reset_open_count:
190 port->port.count = 0;
191 usb_autopm_put_interface(serial->interface);
192 error_get_interface:
193 usb_serial_put(serial);
194 mutex_unlock(&serial->disc_mutex);
195 return retval;
196}
197
198static void usb_console_write(struct console *co,
199 const char *buf, unsigned count)
200{
201 static struct usbcons_info *info = &usbcons_info;
202 struct usb_serial_port *port = info->port;
203 struct usb_serial *serial;
204 int retval = -ENODEV;
205
206 if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED)
207 return;
208 serial = port->serial;
209
210 if (count == 0)
211 return;
212
213 pr_debug("%s - port %d, %d byte(s)\n", __func__, port->number, count);
214
215 if (!port->port.console) {
216 pr_debug("%s - port not opened\n", __func__);
217 return;
218 }
219
220 while (count) {
221 unsigned int i;
222 unsigned int lf;
223
224 for (i = 0, lf = 0 ; i < count ; i++) {
225 if (*(buf + i) == 10) {
226 lf = 1;
227 i++;
228 break;
229 }
230 }
231
232
233 if (serial->type->write)
234 retval = serial->type->write(NULL, port, buf, i);
235 else
236 retval = usb_serial_generic_write(NULL, port, buf, i);
237 pr_debug("%s - return value : %d\n", __func__, retval);
238 if (lf) {
239
240 unsigned char cr = 13;
241 if (serial->type->write)
242 retval = serial->type->write(NULL,
243 port, &cr, 1);
244 else
245 retval = usb_serial_generic_write(NULL,
246 port, &cr, 1);
247 pr_debug("%s - return value : %d\n", __func__, retval);
248 }
249 buf += i;
250 count -= i;
251 }
252}
253
254static struct tty_driver *usb_console_device(struct console *co, int *index)
255{
256 struct tty_driver **p = (struct tty_driver **)co->data;
257
258 if (!*p)
259 return NULL;
260
261 *index = co->index;
262 return *p;
263}
264
265static struct console usbcons = {
266 .name = "ttyUSB",
267 .write = usb_console_write,
268 .device = usb_console_device,
269 .setup = usb_console_setup,
270 .flags = CON_PRINTBUFFER,
271 .index = -1,
272 .data = &usb_serial_tty_driver,
273};
274
275void usb_serial_console_disconnect(struct usb_serial *serial)
276{
277 if (serial && serial->port && serial->port[0]
278 && serial->port[0] == usbcons_info.port) {
279 usb_serial_console_exit();
280 usb_serial_put(serial);
281 }
282}
283
284void usb_serial_console_init(int minor)
285{
286 if (minor == 0) {
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300 pr_debug("registering the USB serial console.\n");
301 register_console(&usbcons);
302 }
303}
304
305void usb_serial_console_exit(void)
306{
307 if (usbcons_info.port) {
308 unregister_console(&usbcons);
309 usbcons_info.port->port.console = 0;
310 usbcons_info.port = NULL;
311 }
312}
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314