]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/usb/serial/f81232.c
Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
[mirror_ubuntu-artful-kernel.git] / drivers / usb / serial / f81232.c
1 /*
2 * Fintek F81232 USB to serial adaptor driver
3 *
4 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
5 * Copyright (C) 2012 Linux Foundation
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 */
12
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/init.h>
16 #include <linux/slab.h>
17 #include <linux/tty.h>
18 #include <linux/tty_driver.h>
19 #include <linux/tty_flip.h>
20 #include <linux/serial.h>
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/spinlock.h>
24 #include <linux/uaccess.h>
25 #include <linux/usb.h>
26 #include <linux/usb/serial.h>
27
28 static const struct usb_device_id id_table[] = {
29 { USB_DEVICE(0x1934, 0x0706) },
30 { } /* Terminating entry */
31 };
32 MODULE_DEVICE_TABLE(usb, id_table);
33
34 #define CONTROL_DTR 0x01
35 #define CONTROL_RTS 0x02
36
37 #define UART_STATE 0x08
38 #define UART_STATE_TRANSIENT_MASK 0x74
39 #define UART_DCD 0x01
40 #define UART_DSR 0x02
41 #define UART_BREAK_ERROR 0x04
42 #define UART_RING 0x08
43 #define UART_FRAME_ERROR 0x10
44 #define UART_PARITY_ERROR 0x20
45 #define UART_OVERRUN_ERROR 0x40
46 #define UART_CTS 0x80
47
48 struct f81232_private {
49 spinlock_t lock;
50 u8 line_control;
51 u8 line_status;
52 };
53
54 static void f81232_update_line_status(struct usb_serial_port *port,
55 unsigned char *data,
56 unsigned int actual_length)
57 {
58 }
59
60 static void f81232_read_int_callback(struct urb *urb)
61 {
62 struct usb_serial_port *port = urb->context;
63 unsigned char *data = urb->transfer_buffer;
64 unsigned int actual_length = urb->actual_length;
65 int status = urb->status;
66 int retval;
67
68 switch (status) {
69 case 0:
70 /* success */
71 break;
72 case -ECONNRESET:
73 case -ENOENT:
74 case -ESHUTDOWN:
75 /* this urb is terminated, clean up */
76 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
77 __func__, status);
78 return;
79 default:
80 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
81 __func__, status);
82 goto exit;
83 }
84
85 usb_serial_debug_data(&port->dev, __func__,
86 urb->actual_length, urb->transfer_buffer);
87
88 f81232_update_line_status(port, data, actual_length);
89
90 exit:
91 retval = usb_submit_urb(urb, GFP_ATOMIC);
92 if (retval)
93 dev_err(&urb->dev->dev,
94 "%s - usb_submit_urb failed with result %d\n",
95 __func__, retval);
96 }
97
98 static void f81232_process_read_urb(struct urb *urb)
99 {
100 struct usb_serial_port *port = urb->context;
101 struct f81232_private *priv = usb_get_serial_port_data(port);
102 unsigned char *data = urb->transfer_buffer;
103 char tty_flag = TTY_NORMAL;
104 unsigned long flags;
105 u8 line_status;
106 int i;
107
108 /* update line status */
109 spin_lock_irqsave(&priv->lock, flags);
110 line_status = priv->line_status;
111 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
112 spin_unlock_irqrestore(&priv->lock, flags);
113 wake_up_interruptible(&port->port.delta_msr_wait);
114
115 if (!urb->actual_length)
116 return;
117
118 /* break takes precedence over parity, */
119 /* which takes precedence over framing errors */
120 if (line_status & UART_BREAK_ERROR)
121 tty_flag = TTY_BREAK;
122 else if (line_status & UART_PARITY_ERROR)
123 tty_flag = TTY_PARITY;
124 else if (line_status & UART_FRAME_ERROR)
125 tty_flag = TTY_FRAME;
126 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, tty_flag);
127
128 /* overrun is special, not associated with a char */
129 if (line_status & UART_OVERRUN_ERROR)
130 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
131
132 if (port->port.console && port->sysrq) {
133 for (i = 0; i < urb->actual_length; ++i)
134 if (!usb_serial_handle_sysrq_char(port, data[i]))
135 tty_insert_flip_char(&port->port, data[i],
136 tty_flag);
137 } else {
138 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
139 urb->actual_length);
140 }
141
142 tty_flip_buffer_push(&port->port);
143 }
144
145 static int set_control_lines(struct usb_device *dev, u8 value)
146 {
147 /* FIXME - Stubbed out for now */
148 return 0;
149 }
150
151 static void f81232_break_ctl(struct tty_struct *tty, int break_state)
152 {
153 /* FIXME - Stubbed out for now */
154
155 /*
156 * break_state = -1 to turn on break, and 0 to turn off break
157 * see drivers/char/tty_io.c to see it used.
158 * last_set_data_urb_value NEVER has the break bit set in it.
159 */
160 }
161
162 static void f81232_set_termios(struct tty_struct *tty,
163 struct usb_serial_port *port, struct ktermios *old_termios)
164 {
165 /* FIXME - Stubbed out for now */
166
167 /* Don't change anything if nothing has changed */
168 if (!tty_termios_hw_change(&tty->termios, old_termios))
169 return;
170
171 /* Do the real work here... */
172 tty_termios_copy_hw(&tty->termios, old_termios);
173 }
174
175 static int f81232_tiocmget(struct tty_struct *tty)
176 {
177 /* FIXME - Stubbed out for now */
178 return 0;
179 }
180
181 static int f81232_tiocmset(struct tty_struct *tty,
182 unsigned int set, unsigned int clear)
183 {
184 /* FIXME - Stubbed out for now */
185 return 0;
186 }
187
188 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
189 {
190 struct ktermios tmp_termios;
191 int result;
192
193 /* Setup termios */
194 if (tty)
195 f81232_set_termios(tty, port, &tmp_termios);
196
197 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
198 if (result) {
199 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
200 " error %d\n", __func__, result);
201 return result;
202 }
203
204 result = usb_serial_generic_open(tty, port);
205 if (result) {
206 usb_kill_urb(port->interrupt_in_urb);
207 return result;
208 }
209
210 port->port.drain_delay = 256;
211 return 0;
212 }
213
214 static void f81232_close(struct usb_serial_port *port)
215 {
216 usb_serial_generic_close(port);
217 usb_kill_urb(port->interrupt_in_urb);
218 }
219
220 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
221 {
222 struct f81232_private *priv = usb_get_serial_port_data(port);
223 unsigned long flags;
224 u8 control;
225
226 spin_lock_irqsave(&priv->lock, flags);
227 /* Change DTR and RTS */
228 if (on)
229 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
230 else
231 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
232 control = priv->line_control;
233 spin_unlock_irqrestore(&priv->lock, flags);
234 set_control_lines(port->serial->dev, control);
235 }
236
237 static int f81232_carrier_raised(struct usb_serial_port *port)
238 {
239 struct f81232_private *priv = usb_get_serial_port_data(port);
240 if (priv->line_status & UART_DCD)
241 return 1;
242 return 0;
243 }
244
245 static int f81232_tiocmiwait(struct tty_struct *tty, unsigned long arg)
246 {
247 struct usb_serial_port *port = tty->driver_data;
248 struct f81232_private *priv = usb_get_serial_port_data(port);
249 unsigned long flags;
250 unsigned int prevstatus;
251 unsigned int status;
252 unsigned int changed;
253
254 spin_lock_irqsave(&priv->lock, flags);
255 prevstatus = priv->line_status;
256 spin_unlock_irqrestore(&priv->lock, flags);
257
258 while (1) {
259 interruptible_sleep_on(&port->port.delta_msr_wait);
260 /* see if a signal did it */
261 if (signal_pending(current))
262 return -ERESTARTSYS;
263
264 if (port->serial->disconnected)
265 return -EIO;
266
267 spin_lock_irqsave(&priv->lock, flags);
268 status = priv->line_status;
269 spin_unlock_irqrestore(&priv->lock, flags);
270
271 changed = prevstatus ^ status;
272
273 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
274 ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
275 ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
276 ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
277 return 0;
278 }
279 prevstatus = status;
280 }
281 /* NOTREACHED */
282 return 0;
283 }
284
285 static int f81232_ioctl(struct tty_struct *tty,
286 unsigned int cmd, unsigned long arg)
287 {
288 struct serial_struct ser;
289 struct usb_serial_port *port = tty->driver_data;
290
291 dev_dbg(&port->dev, "%s (%d) cmd = 0x%04x\n", __func__,
292 port->number, cmd);
293
294 switch (cmd) {
295 case TIOCGSERIAL:
296 memset(&ser, 0, sizeof ser);
297 ser.type = PORT_16654;
298 ser.line = port->serial->minor;
299 ser.port = port->number;
300 ser.baud_base = 460800;
301
302 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
303 return -EFAULT;
304
305 return 0;
306 default:
307 dev_dbg(&port->dev, "%s not supported = 0x%04x\n",
308 __func__, cmd);
309 break;
310 }
311 return -ENOIOCTLCMD;
312 }
313
314 static int f81232_port_probe(struct usb_serial_port *port)
315 {
316 struct f81232_private *priv;
317
318 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
319 if (!priv)
320 return -ENOMEM;
321
322 spin_lock_init(&priv->lock);
323
324 usb_set_serial_port_data(port, priv);
325
326 return 0;
327 }
328
329 static int f81232_port_remove(struct usb_serial_port *port)
330 {
331 struct f81232_private *priv;
332
333 priv = usb_get_serial_port_data(port);
334 kfree(priv);
335
336 return 0;
337 }
338
339 static struct usb_serial_driver f81232_device = {
340 .driver = {
341 .owner = THIS_MODULE,
342 .name = "f81232",
343 },
344 .id_table = id_table,
345 .num_ports = 1,
346 .bulk_in_size = 256,
347 .bulk_out_size = 256,
348 .open = f81232_open,
349 .close = f81232_close,
350 .dtr_rts = f81232_dtr_rts,
351 .carrier_raised = f81232_carrier_raised,
352 .ioctl = f81232_ioctl,
353 .break_ctl = f81232_break_ctl,
354 .set_termios = f81232_set_termios,
355 .tiocmget = f81232_tiocmget,
356 .tiocmset = f81232_tiocmset,
357 .tiocmiwait = f81232_tiocmiwait,
358 .process_read_urb = f81232_process_read_urb,
359 .read_int_callback = f81232_read_int_callback,
360 .port_probe = f81232_port_probe,
361 .port_remove = f81232_port_remove,
362 };
363
364 static struct usb_serial_driver * const serial_drivers[] = {
365 &f81232_device,
366 NULL,
367 };
368
369 module_usb_serial_driver(serial_drivers, id_table);
370
371 MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
372 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org");
373 MODULE_LICENSE("GPL v2");