--- /dev/null
+/*
+ * 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/init.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 bool debug;
+
+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;
+
+ dbg("%s (%d)", __func__, port->number);
+
+ switch (status) {
+ case 0:
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+ dbg("%s - urb shutting down with status: %d", __func__,
+ status);
+ return;
+ default:
+ dbg("%s - nonzero urb status received: %d", __func__,
+ status);
+ goto exit;
+ }
+
+ usb_serial_debug_data(debug, &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;
+ dbg("%s - tty_flag = %d", __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(tty, 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... */
+}
+
+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);
+
+ dbg("%s - submitting interrupt urb", __func__);
+ 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;
+ dbg("%s (%d) cmd = 0x%04x", __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:
+ dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
+ return wait_modem_info(port, arg);
+ default:
+ dbg("%s not supported = 0x%04x", __func__, cmd);
+ break;
+ }
+ return -ENOIOCTLCMD;
+}
+
+static int f81232_startup(struct usb_serial *serial)
+{
+ struct f81232_private *priv;
+ int i;
+
+ for (i = 0; i < serial->num_ports; ++i) {
+ priv = kzalloc(sizeof(struct f81232_private), GFP_KERNEL);
+ if (!priv)
+ goto cleanup;
+ spin_lock_init(&priv->lock);
+ init_waitqueue_head(&priv->delta_msr_wait);
+ usb_set_serial_port_data(serial->port[i], priv);
+ }
+ return 0;
+
+cleanup:
+ for (--i; i >= 0; --i) {
+ priv = usb_get_serial_port_data(serial->port[i]);
+ kfree(priv);
+ usb_set_serial_port_data(serial->port[i], NULL);
+ }
+ return -ENOMEM;
+}
+
+static void f81232_release(struct usb_serial *serial)
+{
+ int i;
+ struct f81232_private *priv;
+
+ for (i = 0; i < serial->num_ports; ++i) {
+ priv = usb_get_serial_port_data(serial->port[i]);
+ kfree(priv);
+ }
+}
+
+static struct usb_driver f81232_driver = {
+ .name = "f81232",
+ .probe = usb_serial_probe,
+ .disconnect = usb_serial_disconnect,
+ .id_table = id_table,
+ .suspend = usb_serial_suspend,
+ .resume = usb_serial_resume,
+ .no_dynamic_id = 1,
+ .supports_autosuspend = 1,
+};
+
+static struct usb_serial_driver f81232_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "f81232",
+ },
+ .id_table = id_table,
+ .usb_driver = &f81232_driver,
+ .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,
+ .attach = f81232_startup,
+ .release = f81232_release,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &f81232_device,
+ NULL,
+};
+
+module_usb_serial_driver(f81232_driver, serial_drivers);
+
+MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
+MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org");
+MODULE_LICENSE("GPL v2");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
projects / platform / kernel / linux-arm64.git / commitdiff