forked from Minki/linux
3018bb5158
Use tty-port modem-status-change wait queue on which processes are woken up at hangup and disconnect. Currently a process waiting on modem-status changes will not be woken on device disconnect. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
374 lines
9.0 KiB
C
374 lines
9.0 KiB
C
/*
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* Fintek F81232 USB to serial adaptor driver
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*
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* Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
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* Copyright (C) 2012 Linux Foundation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x1934, 0x0706) },
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{ } /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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#define CONTROL_DTR 0x01
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#define CONTROL_RTS 0x02
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#define UART_STATE 0x08
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#define UART_STATE_TRANSIENT_MASK 0x74
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#define UART_DCD 0x01
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#define UART_DSR 0x02
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#define UART_BREAK_ERROR 0x04
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#define UART_RING 0x08
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#define UART_FRAME_ERROR 0x10
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#define UART_PARITY_ERROR 0x20
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#define UART_OVERRUN_ERROR 0x40
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#define UART_CTS 0x80
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struct f81232_private {
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spinlock_t lock;
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u8 line_control;
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u8 line_status;
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};
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static void f81232_update_line_status(struct usb_serial_port *port,
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unsigned char *data,
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unsigned int actual_length)
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{
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}
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static void f81232_read_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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unsigned int actual_length = urb->actual_length;
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int status = urb->status;
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int retval;
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switch (status) {
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case 0:
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/* success */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
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__func__, status);
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return;
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default:
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dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
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__func__, status);
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goto exit;
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}
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usb_serial_debug_data(&port->dev, __func__,
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urb->actual_length, urb->transfer_buffer);
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f81232_update_line_status(port, data, actual_length);
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exit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(&urb->dev->dev,
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"%s - usb_submit_urb failed with result %d\n",
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__func__, retval);
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}
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static void f81232_process_read_urb(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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struct f81232_private *priv = usb_get_serial_port_data(port);
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unsigned char *data = urb->transfer_buffer;
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char tty_flag = TTY_NORMAL;
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unsigned long flags;
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u8 line_status;
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int i;
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/* update line status */
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spin_lock_irqsave(&priv->lock, flags);
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line_status = priv->line_status;
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priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
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spin_unlock_irqrestore(&priv->lock, flags);
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wake_up_interruptible(&port->port.delta_msr_wait);
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if (!urb->actual_length)
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return;
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/* break takes precedence over parity, */
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/* which takes precedence over framing errors */
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if (line_status & UART_BREAK_ERROR)
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tty_flag = TTY_BREAK;
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else if (line_status & UART_PARITY_ERROR)
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tty_flag = TTY_PARITY;
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else if (line_status & UART_FRAME_ERROR)
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tty_flag = TTY_FRAME;
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dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, tty_flag);
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/* overrun is special, not associated with a char */
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if (line_status & UART_OVERRUN_ERROR)
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tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
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if (port->port.console && port->sysrq) {
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for (i = 0; i < urb->actual_length; ++i)
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if (!usb_serial_handle_sysrq_char(port, data[i]))
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tty_insert_flip_char(&port->port, data[i],
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tty_flag);
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} else {
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tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
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urb->actual_length);
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}
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tty_flip_buffer_push(&port->port);
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}
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static int set_control_lines(struct usb_device *dev, u8 value)
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{
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/* FIXME - Stubbed out for now */
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return 0;
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}
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static void f81232_break_ctl(struct tty_struct *tty, int break_state)
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{
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/* FIXME - Stubbed out for now */
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/*
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* break_state = -1 to turn on break, and 0 to turn off break
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* see drivers/char/tty_io.c to see it used.
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* last_set_data_urb_value NEVER has the break bit set in it.
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*/
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}
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static void f81232_set_termios(struct tty_struct *tty,
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struct usb_serial_port *port, struct ktermios *old_termios)
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{
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/* FIXME - Stubbed out for now */
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/* Don't change anything if nothing has changed */
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if (!tty_termios_hw_change(&tty->termios, old_termios))
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return;
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/* Do the real work here... */
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tty_termios_copy_hw(&tty->termios, old_termios);
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}
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static int f81232_tiocmget(struct tty_struct *tty)
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{
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/* FIXME - Stubbed out for now */
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return 0;
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}
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static int f81232_tiocmset(struct tty_struct *tty,
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unsigned int set, unsigned int clear)
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{
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/* FIXME - Stubbed out for now */
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return 0;
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}
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static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct ktermios tmp_termios;
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int result;
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/* Setup termios */
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if (tty)
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f81232_set_termios(tty, port, &tmp_termios);
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result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
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if (result) {
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dev_err(&port->dev, "%s - failed submitting interrupt urb,"
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" error %d\n", __func__, result);
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return result;
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}
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result = usb_serial_generic_open(tty, port);
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if (result) {
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usb_kill_urb(port->interrupt_in_urb);
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return result;
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}
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port->port.drain_delay = 256;
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return 0;
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}
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static void f81232_close(struct usb_serial_port *port)
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{
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usb_serial_generic_close(port);
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usb_kill_urb(port->interrupt_in_urb);
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}
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static void f81232_dtr_rts(struct usb_serial_port *port, int on)
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{
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struct f81232_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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u8 control;
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spin_lock_irqsave(&priv->lock, flags);
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/* Change DTR and RTS */
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if (on)
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priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
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else
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priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
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control = priv->line_control;
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spin_unlock_irqrestore(&priv->lock, flags);
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set_control_lines(port->serial->dev, control);
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}
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static int f81232_carrier_raised(struct usb_serial_port *port)
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{
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struct f81232_private *priv = usb_get_serial_port_data(port);
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if (priv->line_status & UART_DCD)
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return 1;
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return 0;
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}
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static int f81232_tiocmiwait(struct tty_struct *tty, unsigned long arg)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct f81232_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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unsigned int prevstatus;
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unsigned int status;
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unsigned int changed;
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spin_lock_irqsave(&priv->lock, flags);
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prevstatus = priv->line_status;
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spin_unlock_irqrestore(&priv->lock, flags);
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while (1) {
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interruptible_sleep_on(&port->port.delta_msr_wait);
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/* see if a signal did it */
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if (signal_pending(current))
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return -ERESTARTSYS;
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if (port->serial->disconnected)
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return -EIO;
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spin_lock_irqsave(&priv->lock, flags);
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status = priv->line_status;
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spin_unlock_irqrestore(&priv->lock, flags);
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changed = prevstatus ^ status;
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if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
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((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
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((arg & TIOCM_CD) && (changed & UART_DCD)) ||
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((arg & TIOCM_CTS) && (changed & UART_CTS))) {
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return 0;
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}
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prevstatus = status;
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}
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/* NOTREACHED */
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return 0;
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}
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static int f81232_ioctl(struct tty_struct *tty,
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unsigned int cmd, unsigned long arg)
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{
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struct serial_struct ser;
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struct usb_serial_port *port = tty->driver_data;
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dev_dbg(&port->dev, "%s (%d) cmd = 0x%04x\n", __func__,
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port->number, cmd);
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switch (cmd) {
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case TIOCGSERIAL:
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memset(&ser, 0, sizeof ser);
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ser.type = PORT_16654;
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ser.line = port->serial->minor;
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ser.port = port->number;
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ser.baud_base = 460800;
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if (copy_to_user((void __user *)arg, &ser, sizeof ser))
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return -EFAULT;
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return 0;
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default:
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dev_dbg(&port->dev, "%s not supported = 0x%04x\n",
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__func__, cmd);
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break;
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}
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return -ENOIOCTLCMD;
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}
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static int f81232_port_probe(struct usb_serial_port *port)
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{
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struct f81232_private *priv;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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spin_lock_init(&priv->lock);
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usb_set_serial_port_data(port, priv);
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return 0;
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}
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static int f81232_port_remove(struct usb_serial_port *port)
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{
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struct f81232_private *priv;
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priv = usb_get_serial_port_data(port);
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kfree(priv);
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return 0;
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}
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static struct usb_serial_driver f81232_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "f81232",
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},
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.id_table = id_table,
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.num_ports = 1,
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.bulk_in_size = 256,
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.bulk_out_size = 256,
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.open = f81232_open,
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.close = f81232_close,
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.dtr_rts = f81232_dtr_rts,
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.carrier_raised = f81232_carrier_raised,
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.ioctl = f81232_ioctl,
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.break_ctl = f81232_break_ctl,
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.set_termios = f81232_set_termios,
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.tiocmget = f81232_tiocmget,
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.tiocmset = f81232_tiocmset,
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.tiocmiwait = f81232_tiocmiwait,
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.process_read_urb = f81232_process_read_urb,
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.read_int_callback = f81232_read_int_callback,
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.port_probe = f81232_port_probe,
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.port_remove = f81232_port_remove,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&f81232_device,
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NULL,
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};
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module_usb_serial_driver(serial_drivers, id_table);
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MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
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MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org");
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MODULE_LICENSE("GPL v2");
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