2 * Fintek F81232 USB to serial adaptor driver
4 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
5 * Copyright (C) 2012 Linux Foundation
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.
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>
28 static const struct usb_device_id id_table[] = {
29 { USB_DEVICE(0x1934, 0x0706) },
30 { } /* Terminating entry */
32 MODULE_DEVICE_TABLE(usb, id_table);
34 #define CONTROL_DTR 0x01
35 #define CONTROL_RTS 0x02
37 #define UART_STATE 0x08
38 #define UART_STATE_TRANSIENT_MASK 0x74
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
48 struct f81232_private {
54 static void f81232_update_line_status(struct usb_serial_port *port,
56 unsigned int actual_length)
59 * FIXME: Update port->icount, and call
61 * wake_up_interruptible(&port->port.delta_msr_wait);
67 static void f81232_read_int_callback(struct urb *urb)
69 struct usb_serial_port *port = urb->context;
70 unsigned char *data = urb->transfer_buffer;
71 unsigned int actual_length = urb->actual_length;
72 int status = urb->status;
82 /* this urb is terminated, clean up */
83 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
87 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
92 usb_serial_debug_data(&port->dev, __func__,
93 urb->actual_length, urb->transfer_buffer);
95 f81232_update_line_status(port, data, actual_length);
98 retval = usb_submit_urb(urb, GFP_ATOMIC);
100 dev_err(&urb->dev->dev,
101 "%s - usb_submit_urb failed with result %d\n",
105 static void f81232_process_read_urb(struct urb *urb)
107 struct usb_serial_port *port = urb->context;
108 struct f81232_private *priv = usb_get_serial_port_data(port);
109 unsigned char *data = urb->transfer_buffer;
110 char tty_flag = TTY_NORMAL;
115 /* update line status */
116 spin_lock_irqsave(&priv->lock, flags);
117 line_status = priv->line_status;
118 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
119 spin_unlock_irqrestore(&priv->lock, flags);
121 if (!urb->actual_length)
124 /* break takes precedence over parity, */
125 /* which takes precedence over framing errors */
126 if (line_status & UART_BREAK_ERROR)
127 tty_flag = TTY_BREAK;
128 else if (line_status & UART_PARITY_ERROR)
129 tty_flag = TTY_PARITY;
130 else if (line_status & UART_FRAME_ERROR)
131 tty_flag = TTY_FRAME;
132 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, tty_flag);
134 /* overrun is special, not associated with a char */
135 if (line_status & UART_OVERRUN_ERROR)
136 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
138 if (port->port.console && port->sysrq) {
139 for (i = 0; i < urb->actual_length; ++i)
140 if (!usb_serial_handle_sysrq_char(port, data[i]))
141 tty_insert_flip_char(&port->port, data[i],
144 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
148 tty_flip_buffer_push(&port->port);
151 static int set_control_lines(struct usb_device *dev, u8 value)
153 /* FIXME - Stubbed out for now */
157 static void f81232_break_ctl(struct tty_struct *tty, int break_state)
159 /* FIXME - Stubbed out for now */
162 * break_state = -1 to turn on break, and 0 to turn off break
163 * see drivers/char/tty_io.c to see it used.
164 * last_set_data_urb_value NEVER has the break bit set in it.
168 static void f81232_set_termios(struct tty_struct *tty,
169 struct usb_serial_port *port, struct ktermios *old_termios)
171 /* FIXME - Stubbed out for now */
173 /* Don't change anything if nothing has changed */
174 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
177 /* Do the real work here... */
179 tty_termios_copy_hw(&tty->termios, old_termios);
182 static int f81232_tiocmget(struct tty_struct *tty)
184 /* FIXME - Stubbed out for now */
188 static int f81232_tiocmset(struct tty_struct *tty,
189 unsigned int set, unsigned int clear)
191 /* FIXME - Stubbed out for now */
195 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
201 f81232_set_termios(tty, port, NULL);
203 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
205 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
206 " error %d\n", __func__, result);
210 result = usb_serial_generic_open(tty, port);
212 usb_kill_urb(port->interrupt_in_urb);
219 static void f81232_close(struct usb_serial_port *port)
221 usb_serial_generic_close(port);
222 usb_kill_urb(port->interrupt_in_urb);
225 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
227 struct f81232_private *priv = usb_get_serial_port_data(port);
231 spin_lock_irqsave(&priv->lock, flags);
232 /* Change DTR and RTS */
234 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
236 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
237 control = priv->line_control;
238 spin_unlock_irqrestore(&priv->lock, flags);
239 set_control_lines(port->serial->dev, control);
242 static int f81232_carrier_raised(struct usb_serial_port *port)
244 struct f81232_private *priv = usb_get_serial_port_data(port);
245 if (priv->line_status & UART_DCD)
250 static int f81232_ioctl(struct tty_struct *tty,
251 unsigned int cmd, unsigned long arg)
253 struct serial_struct ser;
254 struct usb_serial_port *port = tty->driver_data;
258 memset(&ser, 0, sizeof ser);
259 ser.type = PORT_16654;
260 ser.line = port->minor;
261 ser.port = port->port_number;
262 ser.baud_base = 460800;
264 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
274 static int f81232_port_probe(struct usb_serial_port *port)
276 struct f81232_private *priv;
278 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
282 spin_lock_init(&priv->lock);
284 usb_set_serial_port_data(port, priv);
286 port->port.drain_delay = 256;
291 static int f81232_port_remove(struct usb_serial_port *port)
293 struct f81232_private *priv;
295 priv = usb_get_serial_port_data(port);
301 static struct usb_serial_driver f81232_device = {
303 .owner = THIS_MODULE,
306 .id_table = id_table,
309 .bulk_out_size = 256,
311 .close = f81232_close,
312 .dtr_rts = f81232_dtr_rts,
313 .carrier_raised = f81232_carrier_raised,
314 .ioctl = f81232_ioctl,
315 .break_ctl = f81232_break_ctl,
316 .set_termios = f81232_set_termios,
317 .tiocmget = f81232_tiocmget,
318 .tiocmset = f81232_tiocmset,
319 .tiocmiwait = usb_serial_generic_tiocmiwait,
320 .process_read_urb = f81232_process_read_urb,
321 .read_int_callback = f81232_read_int_callback,
322 .port_probe = f81232_port_probe,
323 .port_remove = f81232_port_remove,
326 static struct usb_serial_driver * const serial_drivers[] = {
331 module_usb_serial_driver(serial_drivers, id_table);
333 MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
334 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org");
335 MODULE_LICENSE("GPL v2");