| /* |
| * 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 <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/tty.h> |
| #include <linux/tty_driver.h> |
| #include <linux/tty_flip.h> |
| #include <linux/serial.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/spinlock.h> |
| #include <linux/uaccess.h> |
| #include <linux/usb.h> |
| #include <linux/usb/serial.h> |
| |
| 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; |
| u8 line_control; |
| u8 modem_status; |
| }; |
| |
| static void f81232_update_line_status(struct usb_serial_port *port, |
| unsigned char *data, |
| unsigned int actual_length) |
| { |
| /* |
| * FIXME: Update port->icount, and call |
| * |
| * wake_up_interruptible(&port->port.delta_msr_wait); |
| * |
| * on MSR changes. |
| */ |
| } |
| |
| 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); |
| 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->modem_status; |
| priv->modem_status &= ~UART_STATE_TRANSIENT_MASK; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| if (!urb->actual_length) |
| 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(&port->port, 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(&port->port, data[i], |
| tty_flag); |
| } else { |
| tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, |
| urb->actual_length); |
| } |
| |
| tty_flip_buffer_push(&port->port); |
| } |
| |
| 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 (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) |
| return; |
| |
| /* Do the real work here... */ |
| if (old_termios) |
| 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) |
| { |
| int result; |
| |
| /* Setup termios */ |
| if (tty) |
| f81232_set_termios(tty, port, NULL); |
| |
| 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; |
| } |
| |
| 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->modem_status & UART_DCD) |
| return 1; |
| 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; |
| |
| switch (cmd) { |
| case TIOCGSERIAL: |
| memset(&ser, 0, sizeof ser); |
| ser.type = PORT_16654; |
| ser.line = port->minor; |
| ser.port = port->port_number; |
| ser.baud_base = 460800; |
| |
| if (copy_to_user((void __user *)arg, &ser, sizeof ser)) |
| return -EFAULT; |
| |
| return 0; |
| default: |
| 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); |
| |
| usb_set_serial_port_data(port, priv); |
| |
| port->port.drain_delay = 256; |
| |
| 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, |
| .tiocmiwait = usb_serial_generic_tiocmiwait, |
| .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 <gregkh@linuxfoundation.org"); |
| MODULE_LICENSE("GPL v2"); |