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