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WSL2-Linux-Kernel/drivers/usb/serial/ti_usb_3410_5052.c

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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>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#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 {
struct semaphore td_open_close_sem;
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,
struct ktermios *old_termios);
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);
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);
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];
static int vendor_3410_count;
static ushort product_3410[TI_EXTRA_VID_PID_COUNT];
static int product_3410_count;
static ushort vendor_5052[TI_EXTRA_VID_PID_COUNT];
static int vendor_5052_count;
static ushort product_5052[TI_EXTRA_VID_PID_COUNT];
static int product_5052_count;
/* 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) },
{ USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
};
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) },
{ USB_DEVICE(TI_VENDOR_ID, TI_3410_EZ430_ID) },
{ 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,
.no_dynamic_id = 1,
};
static struct usb_serial_driver ti_1port_device = {
.driver = {
.owner = THIS_MODULE,
.name = "ti_usb_3410_5052_1",
},
.description = "TI USB 3410 1 port adapter",
.usb_driver = &ti_usb_driver,
.id_table = ti_id_table_3410,
.num_interrupt_in = 1,
.num_bulk_in = 1,
.num_bulk_out = 1,
.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,
};
static struct usb_serial_driver ti_2port_device = {
.driver = {
.owner = THIS_MODULE,
.name = "ti_usb_3410_5052_2",
},
.description = "TI USB 5052 2 port adapter",
.usb_driver = &ti_usb_driver,
.id_table = ti_id_table_5052,
.num_interrupt_in = 1,
.num_bulk_in = 2,
.num_bulk_out = 2,
.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 */
j = ARRAY_SIZE(ti_id_table_3410) - TI_EXTRA_VID_PID_COUNT - 1;
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;
}
j = ARRAY_SIZE(ti_id_table_5052) - TI_EXTRA_VID_PID_COUNT - 1;
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",
__FUNCTION__, le16_to_cpu(dev->descriptor.idProduct),
dev->descriptor.bNumConfigurations,
dev->actconfig->desc.bConfigurationValue);
/* create device structure */
tdev = kzalloc(sizeof(struct ti_device), GFP_KERNEL);
if (tdev == NULL) {
dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
return -ENOMEM;
}
sema_init(&tdev->td_open_close_sem, 1);
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;
dbg("%s - device type is %s", __FUNCTION__, tdev->td_is_3410 ? "3410" : "5052");
/* 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) {
tport = kzalloc(sizeof(struct ti_port), GFP_KERNEL);
if (tport == NULL) {
dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
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) {
dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
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;
dbg("%s", __FUNCTION__);
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);
}
}
kfree(tdev);
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));
dbg("%s - port %d", __FUNCTION__, port->number);
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 */
if (down_interruptible(&tdev->td_open_close_sem))
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) {
dbg("%s - start interrupt in urb", __FUNCTION__);
urb = tdev->td_serial->port[0]->interrupt_in_urb;
if (!urb) {
dev_err(&port->dev, "%s - no interrupt urb\n", __FUNCTION__);
status = -EINVAL;
goto up_sem;
}
urb->complete = ti_interrupt_callback;
urb->context = tdev;
urb->dev = dev;
status = usb_submit_urb(urb, GFP_KERNEL);
if (status) {
dev_err(&port->dev, "%s - submit interrupt urb failed, %d\n", __FUNCTION__, status);
goto up_sem;
}
}
ti_set_termios(port, NULL);
dbg("%s - sending TI_OPEN_PORT", __FUNCTION__);
status = ti_command_out_sync(tdev, TI_OPEN_PORT,
(__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
if (status) {
dev_err(&port->dev, "%s - cannot send open command, %d\n", __FUNCTION__, status);
goto unlink_int_urb;
}
dbg("%s - sending TI_START_PORT", __FUNCTION__);
status = ti_command_out_sync(tdev, TI_START_PORT,
(__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
if (status) {
dev_err(&port->dev, "%s - cannot send start command, %d\n", __FUNCTION__, status);
goto unlink_int_urb;
}
dbg("%s - sending TI_PURGE_PORT", __FUNCTION__);
status = ti_command_out_sync(tdev, TI_PURGE_PORT,
(__u8)(TI_UART1_PORT + port_number), TI_PURGE_INPUT, NULL, 0);
if (status) {
dev_err(&port->dev, "%s - cannot clear input buffers, %d\n", __FUNCTION__, status);
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) {
dev_err(&port->dev, "%s - cannot clear output buffers, %d\n", __FUNCTION__, status);
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);
ti_set_termios(port, NULL);
dbg("%s - sending TI_OPEN_PORT (2)", __FUNCTION__);
status = ti_command_out_sync(tdev, TI_OPEN_PORT,
(__u8)(TI_UART1_PORT + port_number), open_settings, NULL, 0);
if (status) {
dev_err(&port->dev, "%s - cannot send open command (2), %d\n", __FUNCTION__, status);
goto unlink_int_urb;
}
dbg("%s - sending TI_START_PORT (2)", __FUNCTION__);
status = ti_command_out_sync(tdev, TI_START_PORT,
(__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
if (status) {
dev_err(&port->dev, "%s - cannot send start command (2), %d\n", __FUNCTION__, status);
goto unlink_int_urb;
}
/* start read urb */
dbg("%s - start read urb", __FUNCTION__);
urb = port->read_urb;
if (!urb) {
dev_err(&port->dev, "%s - no read urb\n", __FUNCTION__);
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) {
dev_err(&port->dev, "%s - submit read urb failed, %d\n", __FUNCTION__, status);
goto unlink_int_urb;
}
tport->tp_is_open = 1;
++tdev->td_open_port_count;
goto up_sem;
unlink_int_urb:
if (tdev->td_open_port_count == 0)
usb_kill_urb(port->serial->port[0]->interrupt_in_urb);
up_sem:
up(&tdev->td_open_close_sem);
dbg("%s - exit %d", __FUNCTION__, status);
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;
int do_up;
dbg("%s - port %d", __FUNCTION__, port->number);
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;
dbg("%s - sending TI_CLOSE_PORT", __FUNCTION__);
status = ti_command_out_sync(tdev, TI_CLOSE_PORT,
(__u8)(TI_UART1_PORT + port_number), 0, NULL, 0);
if (status)
dev_err(&port->dev, "%s - cannot send close port command, %d\n" , __FUNCTION__, status);
/* if down is interrupted, continue anyway */
do_up = !down_interruptible(&tdev->td_open_close_sem);
--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;
}
if (do_up)
up(&tdev->td_open_close_sem);
dbg("%s - exit", __FUNCTION__);
}
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;
dbg("%s - port %d", __FUNCTION__, port->number);
if (count == 0) {
dbg("%s - write request of 0 bytes", __FUNCTION__);
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;
dbg("%s - port %d", __FUNCTION__, port->number);
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);
dbg("%s - returns %d", __FUNCTION__, room);
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;
dbg("%s - port %d", __FUNCTION__, port->number);
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);
dbg("%s - returns %d", __FUNCTION__, chars);
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;
dbg("%s - port %d", __FUNCTION__, port->number);
if (tport == NULL)
return;
tty = port->tty;
if (!tty) {
dbg("%s - no tty", __FUNCTION__);
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;
dbg("%s - port %d", __FUNCTION__, port->number);
if (tport == NULL)
return;
tty = port->tty;
if (!tty) {
dbg("%s - no tty", __FUNCTION__);
return;
}
if (I_IXOFF(tty) || C_CRTSCTS(tty)) {
status = ti_restart_read(tport, tty);
if (status)
dev_err(&port->dev, "%s - cannot restart read, %d\n", __FUNCTION__, status);
}
}
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;
dbg("%s - port %d, cmd = 0x%04X", __FUNCTION__, port->number, cmd);
if (tport == NULL)
return -ENODEV;
switch (cmd) {
case TIOCGSERIAL:
dbg("%s - (%d) TIOCGSERIAL", __FUNCTION__, port->number);
return ti_get_serial_info(tport, (struct serial_struct __user *)arg);
break;
case TIOCSSERIAL:
dbg("%s - (%d) TIOCSSERIAL", __FUNCTION__, port->number);
return ti_set_serial_info(tport, (struct serial_struct __user *)arg);
break;
case TIOCMIWAIT:
dbg("%s - (%d) TIOCMIWAIT", __FUNCTION__, port->number);
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:
dbg("%s - (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__, port->number, tport->tp_icount.rx, tport->tp_icount.tx);
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,
struct ktermios *old_termios)
{
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;
dbg("%s - port %d", __FUNCTION__, port->number);
if (!tty || !tty->termios) {
dbg("%s - no tty or termios", __FUNCTION__);
return;
}
cflag = tty->termios->c_cflag;
iflag = tty->termios->c_iflag;
if (old_termios && cflag == old_termios->c_cflag
&& iflag == old_termios->c_iflag) {
dbg("%s - nothing to change", __FUNCTION__);
return;
}
dbg("%s - clfag %08x, iflag %08x", __FUNCTION__, cflag, iflag);
if (old_termios)
dbg("%s - old clfag %08x, old iflag %08x", __FUNCTION__, old_termios->c_cflag, old_termios->c_iflag);
if (tport == NULL)
return;
config = kmalloc(sizeof(*config), GFP_KERNEL);
if (!config) {
dev_err(&port->dev, "%s - out of memory\n", __FUNCTION__);
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;
}
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);
if (!baud) baud = 9600;
if (tport->tp_tdev->td_is_3410)
config->wBaudRate = (__u16)((923077 + baud/2) / baud);
else
config->wBaudRate = (__u16)((461538 + baud/2) / baud);
dbg("%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d",
__FUNCTION__, baud, config->wBaudRate, config->wFlags, config->bDataBits, config->bParity, config->bStopBits, config->cXon, config->cXoff, config->bUartMode);
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)
dev_err(&port->dev, "%s - cannot set config on port %d, %d\n", __FUNCTION__, port_number, status);
/* 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)
dev_err(&port->dev, "%s - cannot set modem control on port %d, %d\n", __FUNCTION__, port_number, status);
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;
dbg("%s - port %d", __FUNCTION__, port->number);
if (tport == NULL)
return -ENODEV;
msr = tport->tp_msr;
mcr = tport->tp_shadow_mcr;
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);
dbg("%s - 0x%04X", __FUNCTION__, result);
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;
dbg("%s - port %d", __FUNCTION__, port->number);
if (tport == NULL)
return -ENODEV;
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;
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;
dbg("%s - state = %d", __FUNCTION__, break_state);
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)
dbg("%s - error setting break, %d", __FUNCTION__, status);
}
static void ti_interrupt_callback(struct urb *urb)
{
struct ti_device *tdev = (struct ti_device *)urb->context;
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;
int status;
__u8 msr;
dbg("%s", __FUNCTION__);
switch (urb->status) {
case 0:
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dbg("%s - urb shutting down, %d", __FUNCTION__, urb->status);
tdev->td_urb_error = 1;
return;
default:
dev_err(dev, "%s - nonzero urb status, %d\n", __FUNCTION__, urb->status);
tdev->td_urb_error = 1;
goto exit;
}
if (length != 2) {
dbg("%s - bad packet size, %d", __FUNCTION__, length);
goto exit;
}
if (data[0] == TI_CODE_HARDWARE_ERROR) {
dev_err(dev, "%s - hardware error, %d\n", __FUNCTION__, data[1]);
goto exit;
}
port_number = TI_GET_PORT_FROM_CODE(data[0]);
function = TI_GET_FUNC_FROM_CODE(data[0]);
dbg("%s - port_number %d, function %d, data 0x%02X", __FUNCTION__, port_number, function, data[1]);
if (port_number >= serial->num_ports) {
dev_err(dev, "%s - bad port number, %d\n", __FUNCTION__, port_number);
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:
dev_err(dev, "%s - DATA ERROR, port %d, data 0x%02X\n", __FUNCTION__, port_number, data[1]);
break;
case TI_CODE_MODEM_STATUS:
msr = data[1];
dbg("%s - port %d, msr 0x%02X", __FUNCTION__, port_number, msr);
ti_handle_new_msr(tport, msr);
break;
default:
dev_err(dev, "%s - unknown interrupt code, 0x%02X\n", __FUNCTION__, data[1]);
break;
}
exit:
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status)
dev_err(dev, "%s - resubmit interrupt urb failed, %d\n", __FUNCTION__, status);
}
static void ti_bulk_in_callback(struct urb *urb)
{
struct ti_port *tport = (struct ti_port *)urb->context;
struct usb_serial_port *port = tport->tp_port;
struct device *dev = &urb->dev->dev;
int status = 0;
dbg("%s", __FUNCTION__);
switch (urb->status) {
case 0:
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dbg("%s - urb shutting down, %d", __FUNCTION__, urb->status);
tport->tp_tdev->td_urb_error = 1;
wake_up_interruptible(&tport->tp_write_wait);
return;
default:
dev_err(dev, "%s - nonzero urb status, %d\n", __FUNCTION__, urb->status );
tport->tp_tdev->td_urb_error = 1;
wake_up_interruptible(&tport->tp_write_wait);
}
if (urb->status == -EPIPE)
goto exit;
if (urb->status) {
dev_err(dev, "%s - stopping read!\n", __FUNCTION__);
return;
}
if (port->tty && urb->actual_length) {
usb_serial_debug_data(debug, dev, __FUNCTION__,
urb->actual_length, urb->transfer_buffer);
if (!tport->tp_is_open)
dbg("%s - port closed, dropping data", __FUNCTION__);
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;
status = usb_submit_urb(urb, GFP_ATOMIC);
} 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);
if (status)
dev_err(dev, "%s - resubmit read urb failed, %d\n", __FUNCTION__, status);
}
static void ti_bulk_out_callback(struct urb *urb)
{
struct ti_port *tport = (struct ti_port *)urb->context;
struct usb_serial_port *port = tport->tp_port;
struct device *dev = &urb->dev->dev;
dbg("%s - port %d", __FUNCTION__, port->number);
tport->tp_write_urb_in_use = 0;
switch (urb->status) {
case 0:
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dbg("%s - urb shutting down, %d", __FUNCTION__, urb->status);
tport->tp_tdev->td_urb_error = 1;
wake_up_interruptible(&tport->tp_write_wait);
return;
default:
dev_err(dev, "%s - nonzero urb status, %d\n", __FUNCTION__, urb->status);
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 {
cnt = tty_buffer_request_room(tty, length);
if (cnt < length) {
dev_err(dev, "%s - dropping data, %d bytes lost\n", __FUNCTION__, length - cnt);
if(cnt == 0)
break;
}
tty_insert_flip_string(tty, data, cnt);
tty_flip_buffer_push(tty);
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;
dbg("%s - port %d", __FUNCTION__, port->number);
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);
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
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) {
dev_err(&port->dev, "%s - submit write urb failed, %d\n", __FUNCTION__, result);
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)
{
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);
if (!status)
tport->tp_shadow_mcr = mcr;
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;
dbg("%s - port %d", __FUNCTION__, port->number);
size = sizeof(struct ti_port_status);
data = kmalloc(size, GFP_KERNEL);
if (!data) {
dev_err(&port->dev, "%s - out of memory\n", __FUNCTION__);
return -ENOMEM;
}
status = ti_command_in_sync(tdev, TI_GET_PORT_STATUS,
(__u8)(TI_UART1_PORT+port_number), 0, (__u8 *)data, size);
if (status) {
dev_err(&port->dev, "%s - get port status command failed, %d\n", __FUNCTION__, status);
goto free_data;
}
dbg("%s - lsr 0x%02X", __FUNCTION__, data->bLSR);
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;
dbg("%s - msr 0x%02X", __FUNCTION__, msr);
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;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&tport->tp_lock, flags);
/* 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
|| !usb_get_intfdata(port->serial->interface)) /* disconnect */
break;
spin_unlock_irqrestore(&tport->tp_lock, flags);
timeout = schedule_timeout(timeout);
spin_lock_irqsave(&tport->tp_lock, flags);
}
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);
spin_unlock_irqrestore(&tport->tp_lock, flags);
/* 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
&& usb_get_intfdata(port->serial->interface)) { /* not disconnected */
if (ti_get_lsr(tport))
break;
msleep_interruptible(20);
}
}
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) {
urb = tport->tp_port->read_urb;
urb->complete = ti_bulk_in_callback;
urb->context = tport;
urb->dev = tport->tp_port->serial->dev;
status = usb_submit_urb(urb, GFP_KERNEL);
}
tport->tp_read_urb_state = TI_READ_URB_RUNNING;
spin_unlock_irqrestore(&tport->tp_lock, flags);
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;
dbg("%s - addr 0x%08lX, mask 0x%02X, byte 0x%02X", __FUNCTION__, addr, mask, byte);
size = sizeof(struct ti_write_data_bytes) + 2;
data = kmalloc(size, GFP_KERNEL);
if (!data) {
dev_err(dev, "%s - out of memory\n", __FUNCTION__);
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)
dev_err(dev, "%s - failed, %d\n", __FUNCTION__, status);
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) {
dev_err(&dev->dev, "%s - out of memory\n", __FUNCTION__);
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;
dbg("%s - downloading firmware", __FUNCTION__);
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) {
dev_err(&dev->dev, "%s - error downloading firmware, %d\n", __FUNCTION__, status);
return status;
}
dbg("%s - download successful", __FUNCTION__);
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;
cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
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;
}
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