ti_usb_3410_5052.c 46.9 KB
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/* vi: ts=8 sw=8
 *
 * TI 3410/5052 USB Serial Driver
 *
 * Copyright (C) 2004 Texas Instruments
 *
 * This driver is based on the Linux io_ti driver, which is
 *   Copyright (C) 2000-2002 Inside Out Networks
 *   Copyright (C) 2001-2002 Greg Kroah-Hartman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * For questions or problems with this driver, contact Texas Instruments
 * technical support, or Al Borchers <alborchers@steinerpoint.com>, or
 * Peter Berger <pberger@brimson.com>.
 * 
 * This driver needs this hotplug script in /etc/hotplug/usb/ti_usb_3410_5052
 * or in /etc/hotplug.d/usb/ti_usb_3410_5052.hotplug to set the device
 * configuration.
 *
 * #!/bin/bash
 *
 * BOOT_CONFIG=1
 * ACTIVE_CONFIG=2
 *
 * if [[ "$ACTION" != "add" ]]
 * then
 * 	exit
 * fi
 *
 * CONFIG_PATH=/sys${DEVPATH%/?*}/bConfigurationValue
 *
 * if [[ 0`cat $CONFIG_PATH` -ne $BOOT_CONFIG ]]
 * then
 * 	exit
 * fi
 *
 * PRODUCT=${PRODUCT%/?*}		# delete version
 * VENDOR_ID=`printf "%d" 0x${PRODUCT%/?*}`
 * PRODUCT_ID=`printf "%d" 0x${PRODUCT#*?/}`
 *
 * PARAM_PATH=/sys/module/ti_usb_3410_5052/parameters
 *
 * function scan() {
 * 	s=$1
 * 	shift
 * 	for i
 * 	do
 * 		if [[ $s -eq $i ]]
 * 		then
 * 			return 0
 * 		fi
 * 	done
 * 	return 1
 * }
 *
 * IFS=$IFS,
 *
 * if (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_3410` &&
 * scan $PRODUCT_ID 13328 `cat $PARAM_PATH/product_3410`) ||
 * (scan $VENDOR_ID 1105 `cat $PARAM_PATH/vendor_5052` &&
 * scan $PRODUCT_ID 20562 20818 20570 20575 `cat $PARAM_PATH/product_5052`)
 * then
 * 	echo $ACTIVE_CONFIG > $CONFIG_PATH
 * fi
 */

#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/module.h>
#include <linux/spinlock.h>
#include <linux/ioctl.h>
#include <linux/serial.h>
#include <linux/circ_buf.h>
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#include <linux/mutex.h>
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#include <asm/uaccess.h>
#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include "ti_usb_3410_5052.h"
#include "ti_fw_3410.h"		/* firmware image for 3410 */
#include "ti_fw_5052.h"		/* firmware image for 5052 */


/* Defines */

#define TI_DRIVER_VERSION	"v0.9"
#define TI_DRIVER_AUTHOR	"Al Borchers <alborchers@steinerpoint.com>"
#define TI_DRIVER_DESC		"TI USB 3410/5052 Serial Driver"

#define TI_FIRMWARE_BUF_SIZE	16284

#define TI_WRITE_BUF_SIZE	1024

#define TI_TRANSFER_TIMEOUT	2

#define TI_DEFAULT_LOW_LATENCY	0
#define TI_DEFAULT_CLOSING_WAIT	4000		/* in .01 secs */

/* supported setserial flags */
#define TI_SET_SERIAL_FLAGS	(ASYNC_LOW_LATENCY)

/* read urb states */
#define TI_READ_URB_RUNNING	0
#define TI_READ_URB_STOPPING	1
#define TI_READ_URB_STOPPED	2

#define TI_EXTRA_VID_PID_COUNT	5


/* Structures */

struct ti_port {
	int			tp_is_open;
	__u8			tp_msr;
	__u8			tp_lsr;
	__u8			tp_shadow_mcr;
	__u8			tp_uart_mode;	/* 232 or 485 modes */
	unsigned int		tp_uart_base_addr;
	int			tp_flags;
	int			tp_closing_wait;/* in .01 secs */
	struct async_icount	tp_icount;
	wait_queue_head_t	tp_msr_wait;	/* wait for msr change */
	wait_queue_head_t	tp_write_wait;
	struct ti_device	*tp_tdev;
	struct usb_serial_port	*tp_port;
	spinlock_t		tp_lock;
	int			tp_read_urb_state;
	int			tp_write_urb_in_use;
	struct circ_buf		*tp_write_buf;
};

struct ti_device {
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	struct mutex		td_open_close_lock;
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	int			td_open_port_count;
	struct usb_serial	*td_serial;
	int			td_is_3410;
	int			td_urb_error;
};


/* Function Declarations */

static int ti_startup(struct usb_serial *serial);
static void ti_shutdown(struct usb_serial *serial);
static int ti_open(struct usb_serial_port *port, struct file *file);
static void ti_close(struct usb_serial_port *port, struct file *file);
static int ti_write(struct usb_serial_port *port, const unsigned char *data,
	int count);
static int ti_write_room(struct usb_serial_port *port);
static int ti_chars_in_buffer(struct usb_serial_port *port);
static void ti_throttle(struct usb_serial_port *port);
static void ti_unthrottle(struct usb_serial_port *port);
static int ti_ioctl(struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
static void ti_set_termios(struct usb_serial_port *port,
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	struct ktermios *old_termios);
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static int ti_tiocmget(struct usb_serial_port *port, struct file *file);
static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
	unsigned int set, unsigned int clear);
static void ti_break(struct usb_serial_port *port, int break_state);
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static void ti_interrupt_callback(struct urb *urb);
static void ti_bulk_in_callback(struct urb *urb);
static void ti_bulk_out_callback(struct urb *urb);
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static void ti_recv(struct device *dev, struct tty_struct *tty,
	unsigned char *data, int length);
static void ti_send(struct ti_port *tport);
static int ti_set_mcr(struct ti_port *tport, unsigned int mcr);
static int ti_get_lsr(struct ti_port *tport);
static int ti_get_serial_info(struct ti_port *tport,
	struct serial_struct __user *ret_arg);
static int ti_set_serial_info(struct ti_port *tport,
	struct serial_struct __user *new_arg);
static void ti_handle_new_msr(struct ti_port *tport, __u8 msr);

static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush);

static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty);
static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty);

static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
	__u16 moduleid, __u16 value, __u8 *data, int size);
static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
	__u16 moduleid, __u16 value, __u8 *data, int size);

static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
	__u8 mask, __u8 byte);

static int ti_download_firmware(struct ti_device *tdev,
	unsigned char *firmware, unsigned int firmware_size);

/* circular buffer */
static struct circ_buf *ti_buf_alloc(void);
static void ti_buf_free(struct circ_buf *cb);
static void ti_buf_clear(struct circ_buf *cb);
static int ti_buf_data_avail(struct circ_buf *cb);
static int ti_buf_space_avail(struct circ_buf *cb);
static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
static int ti_buf_get(struct circ_buf *cb, char *buf, int count);


/* Data */

/* module parameters */
static int debug;
static int low_latency = TI_DEFAULT_LOW_LATENCY;
static int closing_wait = TI_DEFAULT_CLOSING_WAIT;
static ushort vendor_3410[TI_EXTRA_VID_PID_COUNT];
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static unsigned int vendor_3410_count;
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static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
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static unsigned int product_3410_count;
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static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
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static unsigned int vendor_5052_count;
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static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
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static unsigned int product_5052_count;
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/* supported devices */
/* the array dimension is the number of default entries plus */
/* TI_EXTRA_VID_PID_COUNT user defined entries plus 1 terminating */
/* null entry */
static struct usb_device_id ti_id_table_3410[1+TI_EXTRA_VID_PID_COUNT+1] = {
	{ USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
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	{ USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
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};

static struct usb_device_id ti_id_table_5052[4+TI_EXTRA_VID_PID_COUNT+1] = {
	{ USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
	{ USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
	{ USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
	{ USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
};

static struct usb_device_id ti_id_table_combined[] = {
	{ USB_DEVICE(TI_VENDOR_ID, TI_3410_PRODUCT_ID) },
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	{ USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
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	{ USB_DEVICE(TI_VENDOR_ID, TI_5052_BOOT_PRODUCT_ID) },
	{ USB_DEVICE(TI_VENDOR_ID, TI_5152_BOOT_PRODUCT_ID) },
	{ USB_DEVICE(TI_VENDOR_ID, TI_5052_EEPROM_PRODUCT_ID) },
	{ USB_DEVICE(TI_VENDOR_ID, TI_5052_FIRMWARE_PRODUCT_ID) },
	{ }
};

static struct usb_driver ti_usb_driver = {
	.name			= "ti_usb_3410_5052",
	.probe			= usb_serial_probe,
	.disconnect		= usb_serial_disconnect,
	.id_table		= ti_id_table_combined,
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	.no_dynamic_id = 	1,
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};

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static struct usb_serial_driver ti_1port_device = {
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	.driver = {
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		.owner		= THIS_MODULE,
		.name		= "ti_usb_3410_5052_1",
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	},
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	.description		= "TI USB 3410 1 port adapter",
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	.usb_driver		= &ti_usb_driver,
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	.id_table		= ti_id_table_3410,
	.num_ports		= 1,
	.attach			= ti_startup,
	.shutdown		= ti_shutdown,
	.open			= ti_open,
	.close			= ti_close,
	.write			= ti_write,
	.write_room		= ti_write_room,
	.chars_in_buffer	= ti_chars_in_buffer,
	.throttle		= ti_throttle,
	.unthrottle		= ti_unthrottle,
	.ioctl			= ti_ioctl,
	.set_termios		= ti_set_termios,
	.tiocmget		= ti_tiocmget,
	.tiocmset		= ti_tiocmset,
	.break_ctl		= ti_break,
	.read_int_callback	= ti_interrupt_callback,
	.read_bulk_callback	= ti_bulk_in_callback,
	.write_bulk_callback	= ti_bulk_out_callback,
};

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static struct usb_serial_driver ti_2port_device = {
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	.driver = {
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		.owner		= THIS_MODULE,
		.name		= "ti_usb_3410_5052_2",
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	},
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	.description		= "TI USB 5052 2 port adapter",
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	.usb_driver		= &ti_usb_driver,
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	.id_table		= ti_id_table_5052,
	.num_ports		= 2,
	.attach			= ti_startup,
	.shutdown		= ti_shutdown,
	.open			= ti_open,
	.close			= ti_close,
	.write			= ti_write,
	.write_room		= ti_write_room,
	.chars_in_buffer	= ti_chars_in_buffer,
	.throttle		= ti_throttle,
	.unthrottle		= ti_unthrottle,
	.ioctl			= ti_ioctl,
	.set_termios		= ti_set_termios,
	.tiocmget		= ti_tiocmget,
	.tiocmset		= ti_tiocmset,
	.break_ctl		= ti_break,
	.read_int_callback	= ti_interrupt_callback,
	.read_bulk_callback	= ti_bulk_in_callback,
	.write_bulk_callback	= ti_bulk_out_callback,
};


/* Module */

MODULE_AUTHOR(TI_DRIVER_AUTHOR);
MODULE_DESCRIPTION(TI_DRIVER_DESC);
MODULE_VERSION(TI_DRIVER_VERSION);
MODULE_LICENSE("GPL");

module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Enable debugging, 0=no, 1=yes");

module_param(low_latency, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(low_latency, "TTY low_latency flag, 0=off, 1=on, default is off");

module_param(closing_wait, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(closing_wait, "Maximum wait for data to drain in close, in .01 secs, default is 4000");

module_param_array(vendor_3410, ushort, &vendor_3410_count, S_IRUGO);
MODULE_PARM_DESC(vendor_3410, "Vendor ids for 3410 based devices, 1-5 short integers");
module_param_array(product_3410, ushort, &product_3410_count, S_IRUGO);
MODULE_PARM_DESC(product_3410, "Product ids for 3410 based devices, 1-5 short integers");
module_param_array(vendor_5052, ushort, &vendor_5052_count, S_IRUGO);
MODULE_PARM_DESC(vendor_5052, "Vendor ids for 5052 based devices, 1-5 short integers");
module_param_array(product_5052, ushort, &product_5052_count, S_IRUGO);
MODULE_PARM_DESC(product_5052, "Product ids for 5052 based devices, 1-5 short integers");

MODULE_DEVICE_TABLE(usb, ti_id_table_combined);


/* Functions */

static int __init ti_init(void)
{
	int i,j;
	int ret;

	/* insert extra vendor and product ids */
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	j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
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	for (i=0; i<min(vendor_3410_count,product_3410_count); i++,j++) {
		ti_id_table_3410[j].idVendor = vendor_3410[i];
		ti_id_table_3410[j].idProduct = product_3410[i];
		ti_id_table_3410[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
	}
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	j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
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	for (i=0; i<min(vendor_5052_count,product_5052_count); i++,j++) {
		ti_id_table_5052[j].idVendor = vendor_5052[i];
		ti_id_table_5052[j].idProduct = product_5052[i];
		ti_id_table_5052[j].match_flags = USB_DEVICE_ID_MATCH_DEVICE;
	}

	ret = usb_serial_register(&ti_1port_device);
	if (ret)
		goto failed_1port;
	ret = usb_serial_register(&ti_2port_device);
	if (ret)
		goto failed_2port;

	ret = usb_register(&ti_usb_driver);
	if (ret)
		goto failed_usb;

	info(TI_DRIVER_DESC " " TI_DRIVER_VERSION);

	return 0;

failed_usb:
	usb_serial_deregister(&ti_2port_device);
failed_2port:
	usb_serial_deregister(&ti_1port_device);
failed_1port:
	return ret;
}


static void __exit ti_exit(void)
{
	usb_serial_deregister(&ti_1port_device);
	usb_serial_deregister(&ti_2port_device);
	usb_deregister(&ti_usb_driver);
}


module_init(ti_init);
module_exit(ti_exit);


static int ti_startup(struct usb_serial *serial)
{
	struct ti_device *tdev;
	struct ti_port *tport;
	struct usb_device *dev = serial->dev;
	int status;
	int i;


	dbg("%s - product 0x%4X, num configurations %d, configuration value %d",
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	    __func__, le16_to_cpu(dev->descriptor.idProduct),
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	    dev->descriptor.bNumConfigurations,
	    dev->actconfig->desc.bConfigurationValue);

	/* create device structure */
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	tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
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	if (tdev == NULL) {
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		dev_err(&dev->dev, "%s - out of memory\n", __func__);
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		return -ENOMEM;
	}
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	mutex_init(&tdev->td_open_close_lock);
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	tdev->td_serial = serial;
	usb_set_serial_data(serial, tdev);

	/* determine device type */
	if (usb_match_id(serial->interface, ti_id_table_3410))
		tdev->td_is_3410 = 1;
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	dbg("%s - device type is %s", __func__, tdev->td_is_3410 ? "3410" : "5052");
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	/* if we have only 1 configuration, download firmware */
	if (dev->descriptor.bNumConfigurations == 1) {

		if (tdev->td_is_3410)
			status = ti_download_firmware(tdev, ti_fw_3410,
				sizeof(ti_fw_3410));
		else
			status = ti_download_firmware(tdev, ti_fw_5052,
				sizeof(ti_fw_5052));
		if (status)
			goto free_tdev;

		/* 3410 must be reset, 5052 resets itself */
		if (tdev->td_is_3410) {
			msleep_interruptible(100);
			usb_reset_device(dev);
		}

		status = -ENODEV;
		goto free_tdev;
	} 

	/* the second configuration must be set (in sysfs by hotplug script) */
	if (dev->actconfig->desc.bConfigurationValue == TI_BOOT_CONFIG) {
		status = -ENODEV;
		goto free_tdev;
	}

	/* set up port structures */
	for (i = 0; i < serial->num_ports; ++i) {
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		tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
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		if (tport == NULL) {
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			dev_err(&dev->dev, "%s - out of memory\n", __func__);
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			status = -ENOMEM;
			goto free_tports;
		}
		spin_lock_init(&tport->tp_lock);
		tport->tp_uart_base_addr = (i == 0 ? TI_UART1_BASE_ADDR : TI_UART2_BASE_ADDR);
		tport->tp_flags = low_latency ? ASYNC_LOW_LATENCY : 0;
		tport->tp_closing_wait = closing_wait;
		init_waitqueue_head(&tport->tp_msr_wait);
		init_waitqueue_head(&tport->tp_write_wait);
		tport->tp_write_buf = ti_buf_alloc();
		if (tport->tp_write_buf == NULL) {
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			dev_err(&dev->dev, "%s - out of memory\n", __func__);
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			kfree(tport);
			status = -ENOMEM;
			goto free_tports;
		}
		tport->tp_port = serial->port[i];
		tport->tp_tdev = tdev;
		usb_set_serial_port_data(serial->port[i], tport);
		tport->tp_uart_mode = 0;	/* default is RS232 */
	}
	
	return 0;

free_tports:
	for (--i; i>=0; --i) {
		tport = usb_get_serial_port_data(serial->port[i]);
		ti_buf_free(tport->tp_write_buf);
		kfree(tport);
		usb_set_serial_port_data(serial->port[i], NULL);
	}
free_tdev:
	kfree(tdev);
	usb_set_serial_data(serial, NULL);
	return status;
}


static void ti_shutdown(struct usb_serial *serial)
{
	int i;
	struct ti_device *tdev = usb_get_serial_data(serial);
	struct ti_port *tport;

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	dbg("%s", __func__);
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	for (i=0; i < serial->num_ports; ++i) {
		tport = usb_get_serial_port_data(serial->port[i]);
		if (tport) {
			ti_buf_free(tport->tp_write_buf);
			kfree(tport);
			usb_set_serial_port_data(serial->port[i], NULL);
		}
	}

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	kfree(tdev);
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	usb_set_serial_data(serial, NULL);
}


static int ti_open(struct usb_serial_port *port, struct file *file)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct ti_device *tdev;
	struct usb_device *dev;
	struct urb *urb;
	int port_number;
	int status;
	__u16 open_settings = (__u8)(TI_PIPE_MODE_CONTINOUS | 
			     TI_PIPE_TIMEOUT_ENABLE | 
			     (TI_TRANSFER_TIMEOUT << 2));

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	dbg("%s - port %d", __func__, port->number);
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	if (tport == NULL)
		return -ENODEV;

	dev = port->serial->dev;
	tdev = tport->tp_tdev;

	/* only one open on any port on a device at a time */
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	if (mutex_lock_interruptible(&tdev->td_open_close_lock))
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		return -ERESTARTSYS;

	if (port->tty)
		port->tty->low_latency = 
			(tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;

	port_number = port->number - port->serial->minor;

	memset(&(tport->tp_icount), 0x00, sizeof(tport->tp_icount));

	tport->tp_msr = 0;
	tport->tp_shadow_mcr |= (TI_MCR_RTS | TI_MCR_DTR);

	/* start interrupt urb the first time a port is opened on this device */
	if (tdev->td_open_port_count == 0) {
560
		dbg("%s - start interrupt in urb", __func__);
L
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561 562
		urb = tdev->td_serial->port[0]->interrupt_in_urb;
		if (!urb) {
563
			dev_err(&port->dev, "%s - no interrupt urb\n", __func__);
L
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564
			status = -EINVAL;
565
			goto release_lock;
L
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566 567 568 569 570 571
		}
		urb->complete = ti_interrupt_callback;
		urb->context = tdev;
		urb->dev = dev;
		status = usb_submit_urb(urb, GFP_KERNEL);
		if (status) {
572
			dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __func__, status);
573
			goto release_lock;
L
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		}
	}

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577
	ti_set_termios(port, port->tty->termios);
L
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578

579
	dbg("%s - sending TI_OPEN_PORT", __func__);
L
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580 581 582
	status = ti_command_out_sync(tdev, TI_OPEN_PORT,
		(__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
	if (status) {
583
		dev_err(&port->dev, "%s - cannot send open command, %d\n", __func__, status);
L
Linus Torvalds 已提交
584 585 586
		goto unlink_int_urb;
	}

587
	dbg("%s - sending TI_START_PORT", __func__);
L
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588 589 590
	status = ti_command_out_sync(tdev, TI_START_PORT,
		(__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
	if (status) {
591
		dev_err(&port->dev, "%s - cannot send start command, %d\n", __func__, status);
L
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		goto unlink_int_urb;
	}

595
	dbg("%s - sending TI_PURGE_PORT", __func__);
L
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	status = ti_command_out_sync(tdev, TI_PURGE_PORT,
		(__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
	if (status) {
599
		dev_err(&port->dev, "%s - cannot clear input buffers, %d\n", __func__, status);
L
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		goto unlink_int_urb;
	}
	status = ti_command_out_sync(tdev, TI_PURGE_PORT,
		(__u8)(TI_UART1_PORT + port_number), TI_PURGE_OUTPUT, NULL, 0);
	if (status) {
605
		dev_err(&port->dev, "%s - cannot clear output buffers, %d\n", __func__, status);
L
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		goto unlink_int_urb;
	}

	/* reset the data toggle on the bulk endpoints to work around bug in
	 * host controllers where things get out of sync some times */
	usb_clear_halt(dev, port->write_urb->pipe);
	usb_clear_halt(dev, port->read_urb->pipe);

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	ti_set_termios(port, port->tty->termios);
L
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615

616
	dbg("%s - sending TI_OPEN_PORT (2)", __func__);
L
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617 618 619
	status = ti_command_out_sync(tdev, TI_OPEN_PORT,
		(__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
	if (status) {
620
		dev_err(&port->dev, "%s - cannot send open command (2), %d\n", __func__, status);
L
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621 622 623
		goto unlink_int_urb;
	}

624
	dbg("%s - sending TI_START_PORT (2)", __func__);
L
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625 626 627
	status = ti_command_out_sync(tdev, TI_START_PORT,
		(__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
	if (status) {
628
		dev_err(&port->dev, "%s - cannot send start command (2), %d\n", __func__, status);
L
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629 630 631 632
		goto unlink_int_urb;
	}

	/* start read urb */
633
	dbg("%s - start read urb", __func__);
L
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	urb = port->read_urb;
	if (!urb) {
636
		dev_err(&port->dev, "%s - no read urb\n", __func__);
L
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		status = -EINVAL;
		goto unlink_int_urb;
	}
	tport->tp_read_urb_state = TI_READ_URB_RUNNING;
	urb->complete = ti_bulk_in_callback;
	urb->context = tport;
	urb->dev = dev;
	status = usb_submit_urb(urb, GFP_KERNEL);
	if (status) {
646
		dev_err(&port->dev, "%s - submit read urb failed, %d\n", __func__, status);
L
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647 648 649 650 651 652
		goto unlink_int_urb;
	}

	tport->tp_is_open = 1;
	++tdev->td_open_port_count;

653
	goto release_lock;
L
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unlink_int_urb:
	if (tdev->td_open_port_count == 0)
		usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
658 659
release_lock:
	mutex_unlock(&tdev->td_open_close_lock);
660
	dbg("%s - exit %d", __func__, status);
L
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	return status;
}


static void ti_close(struct usb_serial_port *port, struct file *file)
{
	struct ti_device *tdev;
	struct ti_port *tport;
	int port_number;
	int status;
671
	int do_unlock;
L
Linus Torvalds 已提交
672

673
	dbg("%s - port %d", __func__, port->number);
L
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674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
			 
	tdev = usb_get_serial_data(port->serial);
	tport = usb_get_serial_port_data(port);
	if (tdev == NULL || tport == NULL)
		return;

	tport->tp_is_open = 0;

	ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 1);

	usb_kill_urb(port->read_urb);
	usb_kill_urb(port->write_urb);
	tport->tp_write_urb_in_use = 0;

	port_number = port->number - port->serial->minor;

690
	dbg("%s - sending TI_CLOSE_PORT", __func__);
L
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691 692 693
	status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
		     (__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
	if (status)
694
		dev_err(&port->dev, "%s - cannot send close port command, %d\n" , __func__, status);
L
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695

696 697
	/* if mutex_lock is interrupted, continue anyway */
	do_unlock = !mutex_lock_interruptible(&tdev->td_open_close_lock);
L
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698 699 700 701 702 703
	--tport->tp_tdev->td_open_port_count;
	if (tport->tp_tdev->td_open_port_count <= 0) {
		/* last port is closed, shut down interrupt urb */
		usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
		tport->tp_tdev->td_open_port_count = 0;
	}
704 705
	if (do_unlock)
		mutex_unlock(&tdev->td_open_close_lock);
L
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706

707
	dbg("%s - exit", __func__);
L
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708 709 710 711 712 713 714 715 716
}


static int ti_write(struct usb_serial_port *port, const unsigned char *data,
	int count)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	unsigned long flags;

717
	dbg("%s - port %d", __func__, port->number);
L
Linus Torvalds 已提交
718 719

	if (count == 0) {
720
		dbg("%s - write request of 0 bytes", __func__);
L
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721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
		return 0;
	}

	if (tport == NULL || !tport->tp_is_open)
		return -ENODEV;

	spin_lock_irqsave(&tport->tp_lock, flags);
	count = ti_buf_put(tport->tp_write_buf, data, count);
	spin_unlock_irqrestore(&tport->tp_lock, flags);

	ti_send(tport);

	return count;
}


static int ti_write_room(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	int room = 0;
	unsigned long flags;

743
	dbg("%s - port %d", __func__, port->number);
L
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	if (tport == NULL)
		return -ENODEV;
	
	spin_lock_irqsave(&tport->tp_lock, flags);
	room = ti_buf_space_avail(tport->tp_write_buf);
	spin_unlock_irqrestore(&tport->tp_lock, flags);

752
	dbg("%s - returns %d", __func__, room);
L
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	return room;
}


static int ti_chars_in_buffer(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	int chars = 0;
	unsigned long flags;

763
	dbg("%s - port %d", __func__, port->number);
L
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764 765 766 767 768 769 770 771

	if (tport == NULL)
		return -ENODEV;

	spin_lock_irqsave(&tport->tp_lock, flags);
	chars = ti_buf_data_avail(tport->tp_write_buf);
	spin_unlock_irqrestore(&tport->tp_lock, flags);

772
	dbg("%s - returns %d", __func__, chars);
L
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	return chars;
}


static void ti_throttle(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct tty_struct *tty;

782
	dbg("%s - port %d", __func__, port->number);
L
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	if (tport == NULL)
		return;

	tty = port->tty;
	if (!tty) {
789
		dbg("%s - no tty", __func__);
L
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		return;
	}

	if (I_IXOFF(tty) || C_CRTSCTS(tty))
		ti_stop_read(tport, tty);

}


static void ti_unthrottle(struct usb_serial_port *port)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct tty_struct *tty;
	int status;

805
	dbg("%s - port %d", __func__, port->number);
L
Linus Torvalds 已提交
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	if (tport == NULL)
		return;

	tty = port->tty;
	if (!tty) {
812
		dbg("%s - no tty", __func__);
L
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		return;
	}

	if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
		status = ti_restart_read(tport, tty);
		if (status)
819
			dev_err(&port->dev, "%s - cannot restart read, %d\n", __func__, status);
L
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	}
}


static int ti_ioctl(struct usb_serial_port *port, struct file *file,
	unsigned int cmd, unsigned long arg)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct async_icount cnow;
	struct async_icount cprev;

831
	dbg("%s - port %d, cmd = 0x%04X", __func__, port->number, cmd);
L
Linus Torvalds 已提交
832 833 834 835 836 837

	if (tport == NULL)
		return -ENODEV;

	switch (cmd) {
		case TIOCGSERIAL:
838
			dbg("%s - (%d) TIOCGSERIAL", __func__, port->number);
L
Linus Torvalds 已提交
839 840 841 842
			return ti_get_serial_info(tport, (struct serial_struct __user *)arg);
			break;

		case TIOCSSERIAL:
843
			dbg("%s - (%d) TIOCSSERIAL", __func__, port->number);
L
Linus Torvalds 已提交
844 845 846 847
			return ti_set_serial_info(tport, (struct serial_struct __user *)arg);
			break;

		case TIOCMIWAIT:
848
			dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
L
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849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
			cprev = tport->tp_icount;
			while (1) {
				interruptible_sleep_on(&tport->tp_msr_wait);
				if (signal_pending(current))
					return -ERESTARTSYS;
				cnow = tport->tp_icount;
				if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
				    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
					return -EIO; /* no change => error */
				if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
				    ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
				    ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
				    ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
					return 0;
				}
				cprev = cnow;
			}
			break;

		case TIOCGICOUNT:
869
			dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __func__, port->number, tport->tp_icount.rx, tport->tp_icount.tx);
L
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870 871 872 873 874 875 876 877 878 879
			if (copy_to_user((void __user *)arg, &tport->tp_icount, sizeof(tport->tp_icount)))
				return -EFAULT;
			return 0;
	}

	return -ENOIOCTLCMD;
}


static void ti_set_termios(struct usb_serial_port *port,
A
Alan Cox 已提交
880
	struct ktermios *old_termios)
L
Linus Torvalds 已提交
881 882 883 884 885 886 887 888 889 890
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	struct tty_struct *tty = port->tty;
	struct ti_uart_config *config;
	tcflag_t cflag,iflag;
	int baud;
	int status;
	int port_number = port->number - port->serial->minor;
	unsigned int mcr;

891
	dbg("%s - port %d", __func__, port->number);
L
Linus Torvalds 已提交
892 893 894 895

	cflag = tty->termios->c_cflag;
	iflag = tty->termios->c_iflag;

896 897
	dbg("%s - cflag %08x, iflag %08x", __func__, cflag, iflag);
	dbg("%s - old clfag %08x, old iflag %08x", __func__, old_termios->c_cflag, old_termios->c_iflag);
L
Linus Torvalds 已提交
898 899 900 901 902 903

	if (tport == NULL)
		return;

	config = kmalloc(sizeof(*config), GFP_KERNEL);
	if (!config) {
904
		dev_err(&port->dev, "%s - out of memory\n", __func__);
L
Linus Torvalds 已提交
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930
		return;
	}

	config->wFlags = 0;

	/* these flags must be set */
	config->wFlags |= TI_UART_ENABLE_MS_INTS;
	config->wFlags |= TI_UART_ENABLE_AUTO_START_DMA;
	config->bUartMode = (__u8)(tport->tp_uart_mode);

	switch (cflag & CSIZE) {
		case CS5:
			    config->bDataBits = TI_UART_5_DATA_BITS;
			    break;
		case CS6:
			    config->bDataBits = TI_UART_6_DATA_BITS;
			    break;
		case CS7:
			    config->bDataBits = TI_UART_7_DATA_BITS;
			    break;
		default:
		case CS8:
			    config->bDataBits = TI_UART_8_DATA_BITS;
			    break;
	}

A
Alan Cox 已提交
931 932 933
	/* CMSPAR isn't supported by this driver */
	tty->termios->c_cflag &= ~CMSPAR;

L
Linus Torvalds 已提交
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975
	if (cflag & PARENB) {
		if (cflag & PARODD) {
			config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
			config->bParity = TI_UART_ODD_PARITY;
		} else {
			config->wFlags |= TI_UART_ENABLE_PARITY_CHECKING;
			config->bParity = TI_UART_EVEN_PARITY;
		}
	} else {
		config->wFlags &= ~TI_UART_ENABLE_PARITY_CHECKING;
		config->bParity = TI_UART_NO_PARITY; 	
	}

	if (cflag & CSTOPB)
		config->bStopBits = TI_UART_2_STOP_BITS;
	else
		config->bStopBits = TI_UART_1_STOP_BITS;

	if (cflag & CRTSCTS) {
		/* RTS flow control must be off to drop RTS for baud rate B0 */
		if ((cflag & CBAUD) != B0)
			config->wFlags |= TI_UART_ENABLE_RTS_IN;
		config->wFlags |= TI_UART_ENABLE_CTS_OUT;
	} else {
		tty->hw_stopped = 0;
		ti_restart_read(tport, tty);
	}

	if (I_IXOFF(tty) || I_IXON(tty)) {
		config->cXon  = START_CHAR(tty);
		config->cXoff = STOP_CHAR(tty);

		if (I_IXOFF(tty))
			config->wFlags |= TI_UART_ENABLE_X_IN;
		else
			ti_restart_read(tport, tty);

		if (I_IXON(tty))
			config->wFlags |= TI_UART_ENABLE_X_OUT;
	}

	baud = tty_get_baud_rate(tty);
A
Alan Cox 已提交
976 977
	if (!baud)
		baud = 9600;
L
Linus Torvalds 已提交
978 979 980 981 982
	if (tport->tp_tdev->td_is_3410)
		config->wBaudRate = (__u16)((923077 + baud/2) / baud);
	else
		config->wBaudRate = (__u16)((461538 + baud/2) / baud);

A
Alan Cox 已提交
983 984 985 986
	/* FIXME: Should calculate resulting baud here and report it back */
	if ((cflag & CBAUD) != B0)
		tty_encode_baud_rate(tty, baud, baud);

L
Linus Torvalds 已提交
987
	dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
988
	__func__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
L
Linus Torvalds 已提交
989 990 991 992 993 994 995 996

	cpu_to_be16s(&config->wBaudRate);
	cpu_to_be16s(&config->wFlags);

	status = ti_command_out_sync(tport->tp_tdev, TI_SET_CONFIG,
		(__u8)(TI_UART1_PORT + port_number), 0, (__u8 *)config,
		sizeof(*config));
	if (status)
997
		dev_err(&port->dev, "%s - cannot set config on port %d, %d\n", __func__, port_number, status);
L
Linus Torvalds 已提交
998 999 1000 1001 1002 1003 1004 1005

	/* SET_CONFIG asserts RTS and DTR, reset them correctly */
	mcr = tport->tp_shadow_mcr;
	/* if baud rate is B0, clear RTS and DTR */
	if ((cflag & CBAUD) == B0)
		mcr &= ~(TI_MCR_DTR | TI_MCR_RTS);
	status = ti_set_mcr(tport, mcr);
	if (status)
1006
		dev_err(&port->dev, "%s - cannot set modem control on port %d, %d\n", __func__, port_number, status);
L
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1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017

	kfree(config);
}


static int ti_tiocmget(struct usb_serial_port *port, struct file *file)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	unsigned int result;
	unsigned int msr;
	unsigned int mcr;
1018
	unsigned long flags;
L
Linus Torvalds 已提交
1019

1020
	dbg("%s - port %d", __func__, port->number);
L
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1021 1022 1023 1024

	if (tport == NULL)
		return -ENODEV;

1025
	spin_lock_irqsave(&tport->tp_lock, flags);
L
Linus Torvalds 已提交
1026 1027
	msr = tport->tp_msr;
	mcr = tport->tp_shadow_mcr;
1028
	spin_unlock_irqrestore(&tport->tp_lock, flags);
L
Linus Torvalds 已提交
1029 1030 1031 1032 1033 1034 1035 1036 1037

	result = ((mcr & TI_MCR_DTR) ? TIOCM_DTR : 0)
		| ((mcr & TI_MCR_RTS) ? TIOCM_RTS : 0)
		| ((mcr & TI_MCR_LOOP) ? TIOCM_LOOP : 0)
		| ((msr & TI_MSR_CTS) ? TIOCM_CTS : 0)
		| ((msr & TI_MSR_CD) ? TIOCM_CAR : 0)
		| ((msr & TI_MSR_RI) ? TIOCM_RI : 0)
		| ((msr & TI_MSR_DSR) ? TIOCM_DSR : 0);

1038
	dbg("%s - 0x%04X", __func__, result);
L
Linus Torvalds 已提交
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048

	return result;
}


static int ti_tiocmset(struct usb_serial_port *port, struct file *file,
	unsigned int set, unsigned int clear)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	unsigned int mcr;
1049
	unsigned long flags;
L
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1050

1051
	dbg("%s - port %d", __func__, port->number);
L
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1052 1053 1054 1055

	if (tport == NULL)
		return -ENODEV;

1056
	spin_lock_irqsave(&tport->tp_lock, flags);
L
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1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
	mcr = tport->tp_shadow_mcr;

	if (set & TIOCM_RTS)
		mcr |= TI_MCR_RTS;
	if (set & TIOCM_DTR)
		mcr |= TI_MCR_DTR;
	if (set & TIOCM_LOOP)
		mcr |= TI_MCR_LOOP;

	if (clear & TIOCM_RTS)
		mcr &= ~TI_MCR_RTS;
	if (clear & TIOCM_DTR)
		mcr &= ~TI_MCR_DTR;
	if (clear & TIOCM_LOOP)
		mcr &= ~TI_MCR_LOOP;
1072
	spin_unlock_irqrestore(&tport->tp_lock, flags);
L
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	return ti_set_mcr(tport, mcr);
}


static void ti_break(struct usb_serial_port *port, int break_state)
{
	struct ti_port *tport = usb_get_serial_port_data(port);
	int status;

1083
	dbg("%s - state = %d", __func__, break_state);
L
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	if (tport == NULL)
		return;

	ti_drain(tport, (tport->tp_closing_wait*HZ)/100, 0);

	status = ti_write_byte(tport->tp_tdev,
		tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
		TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);

	if (status)
1095
		dbg("%s - error setting break, %d", __func__, status);
L
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}


1099
static void ti_interrupt_callback(struct urb *urb)
L
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1100
{
1101
	struct ti_device *tdev = urb->context;
L
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	struct usb_serial_port *port;
	struct usb_serial *serial = tdev->td_serial;
	struct ti_port *tport;
	struct device *dev = &urb->dev->dev;
	unsigned char *data = urb->transfer_buffer;
	int length = urb->actual_length;
	int port_number;
	int function;
1110 1111
	int status = urb->status;
	int retval;
L
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	__u8 msr;

1114
	dbg("%s", __func__);
L
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1115

1116
	switch (status) {
L
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	case 0:
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
1122
		dbg("%s - urb shutting down, %d", __func__, status);
L
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		tdev->td_urb_error = 1;
		return;
	default:
1126
		dev_err(dev, "%s - nonzero urb status, %d\n",
1127
			__func__, status);
L
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		tdev->td_urb_error = 1;
		goto exit;
	}

	if (length != 2) {
1133
		dbg("%s - bad packet size, %d", __func__, length);
L
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		goto exit;
	}

	if (data[0] == TI_CODE_HARDWARE_ERROR) {
1138
		dev_err(dev, "%s - hardware error, %d\n", __func__, data[1]);
L
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		goto exit;
	}

	port_number = TI_GET_PORT_FROM_CODE(data[0]);
	function = TI_GET_FUNC_FROM_CODE(data[0]);

1145
	dbg("%s - port_number %d, function %d, data 0x%02X", __func__, port_number, function, data[1]);
L
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	if (port_number >= serial->num_ports) {
1148
		dev_err(dev, "%s - bad port number, %d\n", __func__, port_number);
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		goto exit;
	}

	port = serial->port[port_number];

	tport = usb_get_serial_port_data(port);
	if (!tport)
		goto exit;

	switch (function) {
	case TI_CODE_DATA_ERROR:
1160
		dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n", __func__, port_number, data[1]);
L
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		break;

	case TI_CODE_MODEM_STATUS:
		msr = data[1];
1165
		dbg("%s - port %d, msr 0x%02X", __func__, port_number, msr);
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		ti_handle_new_msr(tport, msr);
		break;

	default:
1170
		dev_err(dev, "%s - unknown interrupt code, 0x%02X\n", __func__, data[1]);
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		break;
	}

exit:
1175 1176 1177
	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if (retval)
		dev_err(dev, "%s - resubmit interrupt urb failed, %d\n",
1178
			__func__, retval);
L
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}


1182
static void ti_bulk_in_callback(struct urb *urb)
L
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{
1184
	struct ti_port *tport = urb->context;
L
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	struct usb_serial_port *port = tport->tp_port;
	struct device *dev = &urb->dev->dev;
1187 1188
	int status = urb->status;
	int retval = 0;
L
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1190
	dbg("%s", __func__);
L
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1191

1192
	switch (status) {
L
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	case 0:
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
1198
		dbg("%s - urb shutting down, %d", __func__, status);
L
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		tport->tp_tdev->td_urb_error = 1;
		wake_up_interruptible(&tport->tp_write_wait);
		return;
	default:
1203
		dev_err(dev, "%s - nonzero urb status, %d\n",
1204
			__func__, status );
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		tport->tp_tdev->td_urb_error = 1;
		wake_up_interruptible(&tport->tp_write_wait);
	}

1209
	if (status == -EPIPE)
L
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		goto exit;

1212
	if (status) {
1213
		dev_err(dev, "%s - stopping read!\n", __func__);
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		return;
	}

	if (port->tty && urb->actual_length) {
1218
		usb_serial_debug_data(debug, dev, __func__,
L
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			urb->actual_length, urb->transfer_buffer);

		if (!tport->tp_is_open)
1222
			dbg("%s - port closed, dropping data", __func__);
L
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		else
			ti_recv(&urb->dev->dev, port->tty, urb->transfer_buffer,
				urb->actual_length);

		spin_lock(&tport->tp_lock);
		tport->tp_icount.rx += urb->actual_length;
		spin_unlock(&tport->tp_lock);
	}

exit:
	/* continue to read unless stopping */
	spin_lock(&tport->tp_lock);
	if (tport->tp_read_urb_state == TI_READ_URB_RUNNING) {
		urb->dev = port->serial->dev;
1237
		retval = usb_submit_urb(urb, GFP_ATOMIC);
L
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	} else if (tport->tp_read_urb_state == TI_READ_URB_STOPPING) {
		tport->tp_read_urb_state = TI_READ_URB_STOPPED;
	}
	spin_unlock(&tport->tp_lock);
1242 1243
	if (retval)
		dev_err(dev, "%s - resubmit read urb failed, %d\n",
1244
			__func__, retval);
L
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}


1248
static void ti_bulk_out_callback(struct urb *urb)
L
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1249
{
1250
	struct ti_port *tport = urb->context;
L
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	struct usb_serial_port *port = tport->tp_port;
	struct device *dev = &urb->dev->dev;
1253
	int status = urb->status;
L
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1254

1255
	dbg("%s - port %d", __func__, port->number);
L
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1256 1257 1258

	tport->tp_write_urb_in_use = 0;

1259
	switch (status) {
L
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	case 0:
		break;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
1265
		dbg("%s - urb shutting down, %d", __func__, status);
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		tport->tp_tdev->td_urb_error = 1;
		wake_up_interruptible(&tport->tp_write_wait);
		return;
	default:
1270
		dev_err(dev, "%s - nonzero urb status, %d\n",
1271
			__func__, status);
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		tport->tp_tdev->td_urb_error = 1;
		wake_up_interruptible(&tport->tp_write_wait);
	}

	/* send any buffered data */
	ti_send(tport);
}


static void ti_recv(struct device *dev, struct tty_struct *tty,
	unsigned char *data, int length)
{
	int cnt;

	do {
A
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		cnt = tty_buffer_request_room(tty, length);
		if (cnt < length) {
1289
			dev_err(dev, "%s - dropping data, %d bytes lost\n", __func__, length - cnt);
A
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1290 1291
			if(cnt == 0)
				break;
L
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		}
A
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1293 1294
		tty_insert_flip_string(tty, data, cnt);
		tty_flip_buffer_push(tty);
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		data += cnt;
		length -= cnt;
	} while (length > 0);

}


static void ti_send(struct ti_port *tport)
{
	int count, result;
	struct usb_serial_port *port = tport->tp_port;
	struct tty_struct *tty = port->tty;
	unsigned long flags;


1310
	dbg("%s - port %d", __func__, port->number);
L
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	spin_lock_irqsave(&tport->tp_lock, flags);

	if (tport->tp_write_urb_in_use) {
		spin_unlock_irqrestore(&tport->tp_lock, flags);
		return;
	}

	count = ti_buf_get(tport->tp_write_buf,
				port->write_urb->transfer_buffer,
				port->bulk_out_size);

	if (count == 0) {
		spin_unlock_irqrestore(&tport->tp_lock, flags);
		return;
	}

	tport->tp_write_urb_in_use = 1;

	spin_unlock_irqrestore(&tport->tp_lock, flags);

1332
	usb_serial_debug_data(debug, &port->dev, __func__, count, port->write_urb->transfer_buffer);
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	usb_fill_bulk_urb(port->write_urb, port->serial->dev,
			   usb_sndbulkpipe(port->serial->dev,
					    port->bulk_out_endpointAddress),
			   port->write_urb->transfer_buffer, count,
			   ti_bulk_out_callback, tport);

	result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
	if (result) {
1342
		dev_err(&port->dev, "%s - submit write urb failed, %d\n", __func__, result);
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		tport->tp_write_urb_in_use = 0; 
		/* TODO: reschedule ti_send */
	} else {
		spin_lock_irqsave(&tport->tp_lock, flags);
		tport->tp_icount.tx += count;
		spin_unlock_irqrestore(&tport->tp_lock, flags);
	}

	/* more room in the buffer for new writes, wakeup */
	if (tty)
		tty_wakeup(tty);
	wake_up_interruptible(&tport->tp_write_wait);
}


static int ti_set_mcr(struct ti_port *tport, unsigned int mcr)
{
1360
	unsigned long flags;
L
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	int status;

	status = ti_write_byte(tport->tp_tdev,
		tport->tp_uart_base_addr + TI_UART_OFFSET_MCR,
		TI_MCR_RTS | TI_MCR_DTR | TI_MCR_LOOP, mcr);

1367
	spin_lock_irqsave(&tport->tp_lock, flags);
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	if (!status)
		tport->tp_shadow_mcr = mcr;
1370
	spin_unlock_irqrestore(&tport->tp_lock, flags);
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	return status;
}


static int ti_get_lsr(struct ti_port *tport)
{
	int size,status;
	struct ti_device *tdev = tport->tp_tdev;
	struct usb_serial_port *port = tport->tp_port;
	int port_number = port->number - port->serial->minor;
	struct ti_port_status *data;

1384
	dbg("%s - port %d", __func__, port->number);
L
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	size = sizeof(struct ti_port_status);
	data = kmalloc(size, GFP_KERNEL);
	if (!data) {
1389
		dev_err(&port->dev, "%s - out of memory\n", __func__);
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		return -ENOMEM;
	}

	status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
		(__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
	if (status) {
1396
		dev_err(&port->dev, "%s - get port status command failed, %d\n", __func__, status);
L
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		goto free_data;
	}

1400
	dbg("%s - lsr 0x%02X", __func__, data->bLSR);
L
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	tport->tp_lsr = data->bLSR;

free_data:
	kfree(data);
	return status;
}


static int ti_get_serial_info(struct ti_port *tport,
	struct serial_struct __user *ret_arg)
{
	struct usb_serial_port *port = tport->tp_port;
	struct serial_struct ret_serial;

	if (!ret_arg)
		return -EFAULT;

	memset(&ret_serial, 0, sizeof(ret_serial));

	ret_serial.type = PORT_16550A;
	ret_serial.line = port->serial->minor;
	ret_serial.port = port->number - port->serial->minor;
	ret_serial.flags = tport->tp_flags;
	ret_serial.xmit_fifo_size = TI_WRITE_BUF_SIZE;
	ret_serial.baud_base = tport->tp_tdev->td_is_3410 ? 921600 : 460800;
	ret_serial.closing_wait = tport->tp_closing_wait;

	if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
		return -EFAULT;

	return 0;
}


static int ti_set_serial_info(struct ti_port *tport,
	struct serial_struct __user *new_arg)
{
	struct usb_serial_port *port = tport->tp_port;
	struct serial_struct new_serial;

	if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
		return -EFAULT;

	tport->tp_flags = new_serial.flags & TI_SET_SERIAL_FLAGS;
	if (port->tty)
		port->tty->low_latency =
			(tport->tp_flags & ASYNC_LOW_LATENCY) ? 1 : 0;
	tport->tp_closing_wait = new_serial.closing_wait;

	return 0;
}


static void ti_handle_new_msr(struct ti_port *tport, __u8 msr)
{
	struct async_icount *icount;
	struct tty_struct *tty;
	unsigned long flags;

1461
	dbg("%s - msr 0x%02X", __func__, msr);
L
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1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498

	if (msr & TI_MSR_DELTA_MASK) {
		spin_lock_irqsave(&tport->tp_lock, flags);
		icount = &tport->tp_icount;
		if (msr & TI_MSR_DELTA_CTS)
			icount->cts++;
		if (msr & TI_MSR_DELTA_DSR)
			icount->dsr++;
		if (msr & TI_MSR_DELTA_CD)
			icount->dcd++;
		if (msr & TI_MSR_DELTA_RI)
			icount->rng++;
		wake_up_interruptible(&tport->tp_msr_wait);
		spin_unlock_irqrestore(&tport->tp_lock, flags);
	}

	tport->tp_msr = msr & TI_MSR_MASK;

	/* handle CTS flow control */
	tty = tport->tp_port->tty;
	if (tty && C_CRTSCTS(tty)) {
		if (msr & TI_MSR_CTS) {
			tty->hw_stopped = 0;
			tty_wakeup(tty);
		} else {
			tty->hw_stopped = 1;
		}
	}
}


static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
{
	struct ti_device *tdev = tport->tp_tdev;
	struct usb_serial_port *port = tport->tp_port;
	wait_queue_t wait;

1499
	dbg("%s - port %d", __func__, port->number);
L
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1500

1501
	spin_lock_irq(&tport->tp_lock);
L
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1502 1503 1504 1505 1506 1507 1508 1509 1510 1511

	/* wait for data to drain from the buffer */
	tdev->td_urb_error = 0;
	init_waitqueue_entry(&wait, current);
	add_wait_queue(&tport->tp_write_wait, &wait);
	for (;;) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (ti_buf_data_avail(tport->tp_write_buf) == 0
		|| timeout == 0 || signal_pending(current)
		|| tdev->td_urb_error
1512
		|| port->serial->disconnected)  /* disconnect */
L
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1513
			break;
1514
		spin_unlock_irq(&tport->tp_lock);
L
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1515
		timeout = schedule_timeout(timeout);
1516
		spin_lock_irq(&tport->tp_lock);
L
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1517 1518 1519 1520 1521 1522 1523 1524
	}
	set_current_state(TASK_RUNNING);
	remove_wait_queue(&tport->tp_write_wait, &wait);

	/* flush any remaining data in the buffer */
	if (flush)
		ti_buf_clear(tport->tp_write_buf);

1525
	spin_unlock_irq(&tport->tp_lock);
L
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1526

1527
	mutex_lock(&port->serial->disc_mutex);
L
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1528 1529 1530 1531 1532 1533
	/* wait for data to drain from the device */
	/* wait for empty tx register, plus 20 ms */
	timeout += jiffies;
	tport->tp_lsr &= ~TI_LSR_TX_EMPTY;
	while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
	&& !(tport->tp_lsr&TI_LSR_TX_EMPTY) && !tdev->td_urb_error
1534
	&& !port->serial->disconnected) {
L
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1535 1536
		if (ti_get_lsr(tport))
			break;
1537
		mutex_unlock(&port->serial->disc_mutex);
L
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1538
		msleep_interruptible(20);
1539
		mutex_lock(&port->serial->disc_mutex);
L
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1540
	}
1541
	mutex_unlock(&port->serial->disc_mutex);
L
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1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566
}


static void ti_stop_read(struct ti_port *tport, struct tty_struct *tty)
{
	unsigned long flags;

	spin_lock_irqsave(&tport->tp_lock, flags);

	if (tport->tp_read_urb_state == TI_READ_URB_RUNNING)
		tport->tp_read_urb_state = TI_READ_URB_STOPPING;

	spin_unlock_irqrestore(&tport->tp_lock, flags);
}


static int ti_restart_read(struct ti_port *tport, struct tty_struct *tty)
{
	struct urb *urb;
	int status = 0;
	unsigned long flags;

	spin_lock_irqsave(&tport->tp_lock, flags);

	if (tport->tp_read_urb_state == TI_READ_URB_STOPPED) {
1567
		tport->tp_read_urb_state = TI_READ_URB_RUNNING;
L
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		urb = tport->tp_port->read_urb;
1569
		spin_unlock_irqrestore(&tport->tp_lock, flags);
L
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1570 1571 1572 1573
		urb->complete = ti_bulk_in_callback;
		urb->context = tport;
		urb->dev = tport->tp_port->serial->dev;
		status = usb_submit_urb(urb, GFP_KERNEL);
1574 1575 1576
	} else  {
		tport->tp_read_urb_state = TI_READ_URB_RUNNING;
		spin_unlock_irqrestore(&tport->tp_lock, flags);
L
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1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630
	}

	return status;
}


static int ti_command_out_sync(struct ti_device *tdev, __u8 command,
	__u16 moduleid, __u16 value, __u8 *data, int size)
{
	int status;

	status = usb_control_msg(tdev->td_serial->dev,
		usb_sndctrlpipe(tdev->td_serial->dev, 0), command,
		(USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT),
		value, moduleid, data, size, 1000);

	if (status == size)
		status = 0;

	if (status > 0)
		status = -ECOMM;

	return status;
}


static int ti_command_in_sync(struct ti_device *tdev, __u8 command,
	__u16 moduleid, __u16 value, __u8 *data, int size)
{
	int status;

	status = usb_control_msg(tdev->td_serial->dev,
		usb_rcvctrlpipe(tdev->td_serial->dev, 0), command,
		(USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN),
		value, moduleid, data, size, 1000);

	if (status == size)
		status = 0;

	if (status > 0)
		status = -ECOMM;

	return status;
}


static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
	__u8 mask, __u8 byte)
{
	int status;
	unsigned int size;
	struct ti_write_data_bytes *data;
	struct device *dev = &tdev->td_serial->dev->dev;

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	dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X", __func__, addr, mask, byte);
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	size = sizeof(struct ti_write_data_bytes) + 2;
	data = kmalloc(size, GFP_KERNEL);
	if (!data) {
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		dev_err(dev, "%s - out of memory\n", __func__);
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		return -ENOMEM;
	}

	data->bAddrType = TI_RW_DATA_ADDR_XDATA;
	data->bDataType = TI_RW_DATA_BYTE;
	data->bDataCounter = 1;
	data->wBaseAddrHi = cpu_to_be16(addr>>16);
	data->wBaseAddrLo = cpu_to_be16(addr);
	data->bData[0] = mask;
	data->bData[1] = byte;

	status = ti_command_out_sync(tdev, TI_WRITE_DATA, TI_RAM_PORT, 0,
		(__u8 *)data, size);

	if (status < 0)
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		dev_err(dev, "%s - failed, %d\n", __func__, status);
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	kfree(data);

	return status;
}


static int ti_download_firmware(struct ti_device *tdev,
	unsigned char *firmware, unsigned int firmware_size)
{
	int status = 0;
	int buffer_size;
	int pos;
	int len;
	int done;
	__u8 cs = 0;
	__u8 *buffer;
	struct usb_device *dev = tdev->td_serial->dev;
	struct ti_firmware_header *header;
	unsigned int pipe = usb_sndbulkpipe(dev,
		tdev->td_serial->port[0]->bulk_out_endpointAddress);


	buffer_size = TI_FIRMWARE_BUF_SIZE + sizeof(struct ti_firmware_header);
	buffer = kmalloc(buffer_size, GFP_KERNEL);
	if (!buffer) {
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		dev_err(&dev->dev, "%s - out of memory\n", __func__);
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		return -ENOMEM;
	}

	memcpy(buffer, firmware, firmware_size);
	memset(buffer+firmware_size, 0xff, buffer_size-firmware_size);

	for(pos = sizeof(struct ti_firmware_header); pos < buffer_size; pos++)
		cs = (__u8)(cs + buffer[pos]);

	header = (struct ti_firmware_header *)buffer;
	header->wLength = cpu_to_le16((__u16)(buffer_size - sizeof(struct ti_firmware_header)));
	header->bCheckSum = cs;

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	dbg("%s - downloading firmware", __func__);
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	for (pos = 0; pos < buffer_size; pos += done) {
		len = min(buffer_size - pos, TI_DOWNLOAD_MAX_PACKET_SIZE);
		status = usb_bulk_msg(dev, pipe, buffer+pos, len, &done, 1000);
		if (status)
			break;
	}

	kfree(buffer);

	if (status) {
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		dev_err(&dev->dev, "%s - error downloading firmware, %d\n", __func__, status);
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		return status;
	}

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	dbg("%s - download successful", __func__);
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	return 0;
}


/* Circular Buffer Functions */

/*
 * ti_buf_alloc
 *
 * Allocate a circular buffer and all associated memory.
 */

static struct circ_buf *ti_buf_alloc(void)
{
	struct circ_buf *cb;

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	cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
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	if (cb == NULL)
		return NULL;

	cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
	if (cb->buf == NULL) {
		kfree(cb);
		return NULL;
	}

	ti_buf_clear(cb);

	return cb;
}


/*
 * ti_buf_free
 *
 * Free the buffer and all associated memory.
 */

static void ti_buf_free(struct circ_buf *cb)
{
	kfree(cb->buf);
	kfree(cb);
}


/*
 * ti_buf_clear
 *
 * Clear out all data in the circular buffer.
 */

static void ti_buf_clear(struct circ_buf *cb)
{
	cb->head = cb->tail = 0;
}


/*
 * ti_buf_data_avail
 *
 * Return the number of bytes of data available in the circular
 * buffer.
 */

static int ti_buf_data_avail(struct circ_buf *cb)
{
	return CIRC_CNT(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
}


/*
 * ti_buf_space_avail
 *
 * Return the number of bytes of space available in the circular
 * buffer.
 */

static int ti_buf_space_avail(struct circ_buf *cb)
{
	return CIRC_SPACE(cb->head,cb->tail,TI_WRITE_BUF_SIZE);
}


/*
 * ti_buf_put
 *
 * Copy data data from a user buffer and put it into the circular buffer.
 * Restrict to the amount of space available.
 *
 * Return the number of bytes copied.
 */

static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
{
	int c, ret = 0;

	while (1) {
		c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
		if (count < c)
			c = count;
		if (c <= 0)
			break;
		memcpy(cb->buf + cb->head, buf, c);
		cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
		buf += c;
		count -= c;
		ret += c;
	}

	return ret;
}


/*
 * ti_buf_get
 *
 * Get data from the circular buffer and copy to the given buffer.
 * Restrict to the amount of data available.
 *
 * Return the number of bytes copied.
 */

static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
{
	int c, ret = 0;

	while (1) {
		c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
		if (count < c)
			c = count;
		if (c <= 0)
			break;
		memcpy(buf, cb->buf + cb->tail, c);
		cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
		buf += c;
		count -= c;
		ret += c;
	}

	return ret;
}