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android_kernel_xiaomi_sm8350/drivers/usb/serial/mos7840.c
Adrian Bunk ad18027f49 USB: mos7840.c: fix a check-after-dereference 
This patch fixes an obvious check-after-dereference spotted by the
Coverity checker.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-10-17 14:46:33 -07:00

2949 lines
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/*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Clean ups from Moschip version and a few ioctl implementations by:
* Paul B Schroeder <pschroeder "at" uplogix "dot" com>
*
* Originally based on drivers/usb/serial/io_edgeport.c which is:
* Copyright (C) 2000 Inside Out Networks, All rights reserved.
* Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
*
*/
#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/serial.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <asm/uaccess.h>
/*
* Version Information
*/
#define DRIVER_VERSION "1.3.1"
#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
/*
* 16C50 UART register defines
*/
#define LCR_BITS_5 0x00 /* 5 bits/char */
#define LCR_BITS_6 0x01 /* 6 bits/char */
#define LCR_BITS_7 0x02 /* 7 bits/char */
#define LCR_BITS_8 0x03 /* 8 bits/char */
#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
#define LCR_STOP_1 0x00 /* 1 stop bit */
#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
#define LCR_PAR_NONE 0x00 /* No parity */
#define LCR_PAR_ODD 0x08 /* Odd parity */
#define LCR_PAR_EVEN 0x18 /* Even parity */
#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
#define LCR_PAR_MASK 0x38 /* Mask for parity field */
#define LCR_SET_BREAK 0x40 /* Set Break condition */
#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
#define MCR_DTR 0x01 /* Assert DTR */
#define MCR_RTS 0x02 /* Assert RTS */
#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
#define MOS7840_MSR_RI 0x40 /* Current state of RI */
#define MOS7840_MSR_CD 0x80 /* Current state of CD */
/*
* Defines used for sending commands to port
*/
#define WAIT_FOR_EVER (HZ * 0 ) /* timeout urb is wait for ever */
#define MOS_WDR_TIMEOUT (HZ * 5 ) /* default urb timeout */
#define MOS_PORT1 0x0200
#define MOS_PORT2 0x0300
#define MOS_VENREG 0x0000
#define MOS_MAX_PORT 0x02
#define MOS_WRITE 0x0E
#define MOS_READ 0x0D
/* Requests */
#define MCS_RD_RTYPE 0xC0
#define MCS_WR_RTYPE 0x40
#define MCS_RDREQ 0x0D
#define MCS_WRREQ 0x0E
#define MCS_CTRL_TIMEOUT 500
#define VENDOR_READ_LENGTH (0x01)
#define MAX_NAME_LEN 64
#define ZLP_REG1 0x3A //Zero_Flag_Reg1 58
#define ZLP_REG5 0x3E //Zero_Flag_Reg5 62
/* For higher baud Rates use TIOCEXBAUD */
#define TIOCEXBAUD 0x5462
/* vendor id and device id defines */
#define USB_VENDOR_ID_MOSCHIP 0x9710
#define MOSCHIP_DEVICE_ID_7840 0x7840
#define MOSCHIP_DEVICE_ID_7820 0x7820
/* Interrupt Rotinue Defines */
#define SERIAL_IIR_RLS 0x06
#define SERIAL_IIR_MS 0x00
/*
* Emulation of the bit mask on the LINE STATUS REGISTER.
*/
#define SERIAL_LSR_DR 0x0001
#define SERIAL_LSR_OE 0x0002
#define SERIAL_LSR_PE 0x0004
#define SERIAL_LSR_FE 0x0008
#define SERIAL_LSR_BI 0x0010
#define MOS_MSR_DELTA_CTS 0x10
#define MOS_MSR_DELTA_DSR 0x20
#define MOS_MSR_DELTA_RI 0x40
#define MOS_MSR_DELTA_CD 0x80
// Serial Port register Address
#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
#define LINE_CONTROL_REGISTER ((__u16)(0x03))
#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
#define LINE_STATUS_REGISTER ((__u16)(0x05))
#define MODEM_STATUS_REGISTER ((__u16)(0x06))
#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
#define DIVISOR_LATCH_LSB ((__u16)(0x00))
#define DIVISOR_LATCH_MSB ((__u16)(0x01))
#define CLK_MULTI_REGISTER ((__u16)(0x02))
#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
#define SERIAL_LCR_DLAB ((__u16)(0x0080))
/*
* URB POOL related defines
*/
#define NUM_URBS 16 /* URB Count */
#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
static struct usb_device_id moschip_port_id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
{} /* terminating entry */
};
static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
{} /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
/* This structure holds all of the local port information */
struct moschip_port {
int port_num; /*Actual port number in the device(1,2,etc) */
struct urb *write_urb; /* write URB for this port */
struct urb *read_urb; /* read URB for this port */
__u8 shadowLCR; /* last LCR value received */
__u8 shadowMCR; /* last MCR value received */
char open;
wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
int delta_msr_cond;
struct async_icount icount;
struct usb_serial_port *port; /* loop back to the owner of this object */
/*Offsets */
__u8 SpRegOffset;
__u8 ControlRegOffset;
__u8 DcrRegOffset;
//for processing control URBS in interrupt context
struct urb *control_urb;
char *ctrl_buf;
int MsrLsr;
struct urb *write_urb_pool[NUM_URBS];
};
static int debug;
static int mos7840_num_ports; //this says the number of ports in the device
static int mos7840_num_open_ports;
/*
* mos7840_set_reg_sync
* To set the Control register by calling usb_fill_control_urb function
* by passing usb_sndctrlpipe function as parameter.
*/
static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
__u16 val)
{
struct usb_device *dev = port->serial->dev;
val = val & 0x00ff;
dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
MCS_WR_RTYPE, val, reg, NULL, 0,
MOS_WDR_TIMEOUT);
}
/*
* mos7840_get_reg_sync
* To set the Uart register by calling usb_fill_control_urb function by
* passing usb_rcvctrlpipe function as parameter.
*/
static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
__u16 * val)
{
struct usb_device *dev = port->serial->dev;
int ret = 0;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
MOS_WDR_TIMEOUT);
dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
*val = (*val) & 0x00ff;
return ret;
}
/*
* mos7840_set_uart_reg
* To set the Uart register by calling usb_fill_control_urb function by
* passing usb_sndctrlpipe function as parameter.
*/
static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
__u16 val)
{
struct usb_device *dev = port->serial->dev;
val = val & 0x00ff;
// For the UART control registers, the application number need to be Or'ed
if (mos7840_num_ports == 4) {
val |=
(((__u16) port->number - (__u16) (port->serial->minor)) +
1) << 8;
dbg("mos7840_set_uart_reg application number is %x\n", val);
} else {
if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
val |=
(((__u16) port->number -
(__u16) (port->serial->minor)) + 1) << 8;
dbg("mos7840_set_uart_reg application number is %x\n",
val);
} else {
val |=
(((__u16) port->number -
(__u16) (port->serial->minor)) + 2) << 8;
dbg("mos7840_set_uart_reg application number is %x\n",
val);
}
}
return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
MCS_WR_RTYPE, val, reg, NULL, 0,
MOS_WDR_TIMEOUT);
}
/*
* mos7840_get_uart_reg
* To set the Control register by calling usb_fill_control_urb function
* by passing usb_rcvctrlpipe function as parameter.
*/
static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
__u16 * val)
{
struct usb_device *dev = port->serial->dev;
int ret = 0;
__u16 Wval;
//dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
/*Wval is same as application number */
if (mos7840_num_ports == 4) {
Wval =
(((__u16) port->number - (__u16) (port->serial->minor)) +
1) << 8;
dbg("mos7840_get_uart_reg application number is %x\n", Wval);
} else {
if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
Wval =
(((__u16) port->number -
(__u16) (port->serial->minor)) + 1) << 8;
dbg("mos7840_get_uart_reg application number is %x\n",
Wval);
} else {
Wval =
(((__u16) port->number -
(__u16) (port->serial->minor)) + 2) << 8;
dbg("mos7840_get_uart_reg application number is %x\n",
Wval);
}
}
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
MOS_WDR_TIMEOUT);
*val = (*val) & 0x00ff;
return ret;
}
static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
{
dbg("***************************************\n");
dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
dbg("***************************************\n");
}
/************************************************************************/
/************************************************************************/
/* I N T E R F A C E F U N C T I O N S */
/* I N T E R F A C E F U N C T I O N S */
/************************************************************************/
/************************************************************************/
static inline void mos7840_set_port_private(struct usb_serial_port *port,
struct moschip_port *data)
{
usb_set_serial_port_data(port, (void *)data);
}
static inline struct moschip_port *mos7840_get_port_private(struct
usb_serial_port
*port)
{
return (struct moschip_port *)usb_get_serial_port_data(port);
}
static int mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
{
struct moschip_port *mos7840_port;
struct async_icount *icount;
mos7840_port = port;
icount = &mos7840_port->icount;
if (new_msr &
(MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
MOS_MSR_DELTA_CD)) {
icount = &mos7840_port->icount;
/* update input line counters */
if (new_msr & MOS_MSR_DELTA_CTS) {
icount->cts++;
}
if (new_msr & MOS_MSR_DELTA_DSR) {
icount->dsr++;
}
if (new_msr & MOS_MSR_DELTA_CD) {
icount->dcd++;
}
if (new_msr & MOS_MSR_DELTA_RI) {
icount->rng++;
}
}
return 0;
}
static int mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
{
struct async_icount *icount;
dbg("%s - %02x", __FUNCTION__, new_lsr);
if (new_lsr & SERIAL_LSR_BI) {
//
// Parity and Framing errors only count if they
// occur exclusive of a break being
// received.
//
new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
}
/* update input line counters */
icount = &port->icount;
if (new_lsr & SERIAL_LSR_BI) {
icount->brk++;
}
if (new_lsr & SERIAL_LSR_OE) {
icount->overrun++;
}
if (new_lsr & SERIAL_LSR_PE) {
icount->parity++;
}
if (new_lsr & SERIAL_LSR_FE) {
icount->frame++;
}
return 0;
}
/************************************************************************/
/************************************************************************/
/* U S B C A L L B A C K F U N C T I O N S */
/* U S B C A L L B A C K F U N C T I O N S */
/************************************************************************/
/************************************************************************/
static void mos7840_control_callback(struct urb *urb)
{
unsigned char *data;
struct moschip_port *mos7840_port;
__u8 regval = 0x0;
if (!urb) {
dbg("%s", "Invalid Pointer !!!!:\n");
return;
}
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__,
urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__,
urb->status);
goto exit;
}
mos7840_port = (struct moschip_port *)urb->context;
dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
mos7840_port->MsrLsr, mos7840_port->port_num);
data = urb->transfer_buffer;
regval = (__u8) data[0];
dbg("%s data is %x\n", __FUNCTION__, regval);
if (mos7840_port->MsrLsr == 0)
mos7840_handle_new_msr(mos7840_port, regval);
else if (mos7840_port->MsrLsr == 1)
mos7840_handle_new_lsr(mos7840_port, regval);
exit:
return;
}
static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
__u16 * val)
{
struct usb_device *dev = mcs->port->serial->dev;
struct usb_ctrlrequest *dr = NULL;
unsigned char *buffer = NULL;
int ret = 0;
buffer = (__u8 *) mcs->ctrl_buf;
// dr=(struct usb_ctrlrequest *)(buffer);
dr = (void *)(buffer + 2);
dr->bRequestType = MCS_RD_RTYPE;
dr->bRequest = MCS_RDREQ;
dr->wValue = cpu_to_le16(Wval); //0;
dr->wIndex = cpu_to_le16(reg);
dr->wLength = cpu_to_le16(2);
usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
(unsigned char *)dr, buffer, 2,
mos7840_control_callback, mcs);
mcs->control_urb->transfer_buffer_length = 2;
ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
return ret;
}
/*****************************************************************************
* mos7840_interrupt_callback
* this is the callback function for when we have received data on the
* interrupt endpoint.
*****************************************************************************/
static void mos7840_interrupt_callback(struct urb *urb)
{
int result;
int length;
struct moschip_port *mos7840_port;
struct usb_serial *serial;
__u16 Data;
unsigned char *data;
__u8 sp[5], st;
int i;
__u16 wval;
dbg("%s", " : Entering\n");
if (!urb) {
dbg("%s", "Invalid Pointer !!!!:\n");
return;
}
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__,
urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__,
urb->status);
goto exit;
}
length = urb->actual_length;
data = urb->transfer_buffer;
serial = (struct usb_serial *)urb->context;
/* Moschip get 5 bytes
* Byte 1 IIR Port 1 (port.number is 0)
* Byte 2 IIR Port 2 (port.number is 1)
* Byte 3 IIR Port 3 (port.number is 2)
* Byte 4 IIR Port 4 (port.number is 3)
* Byte 5 FIFO status for both */
if (length && length > 5) {
dbg("%s \n", "Wrong data !!!");
return;
}
sp[0] = (__u8) data[0];
sp[1] = (__u8) data[1];
sp[2] = (__u8) data[2];
sp[3] = (__u8) data[3];
st = (__u8) data[4];
for (i = 0; i < serial->num_ports; i++) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
wval =
(((__u16) serial->port[i]->number -
(__u16) (serial->minor)) + 1) << 8;
if (mos7840_port->open) {
if (sp[i] & 0x01) {
dbg("SP%d No Interrupt !!!\n", i);
} else {
switch (sp[i] & 0x0f) {
case SERIAL_IIR_RLS:
dbg("Serial Port %d: Receiver status error or ", i);
dbg("address bit detected in 9-bit mode\n");
mos7840_port->MsrLsr = 1;
mos7840_get_reg(mos7840_port, wval,
LINE_STATUS_REGISTER,
&Data);
break;
case SERIAL_IIR_MS:
dbg("Serial Port %d: Modem status change\n", i);
mos7840_port->MsrLsr = 0;
mos7840_get_reg(mos7840_port, wval,
MODEM_STATUS_REGISTER,
&Data);
break;
}
}
}
}
exit:
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dev_err(&urb->dev->dev,
"%s - Error %d submitting interrupt urb\n",
__FUNCTION__, result);
}
return;
}
static int mos7840_port_paranoia_check(struct usb_serial_port *port,
const char *function)
{
if (!port) {
dbg("%s - port == NULL", function);
return -1;
}
if (!port->serial) {
dbg("%s - port->serial == NULL", function);
return -1;
}
return 0;
}
/* Inline functions to check the sanity of a pointer that is passed to us */
static int mos7840_serial_paranoia_check(struct usb_serial *serial,
const char *function)
{
if (!serial) {
dbg("%s - serial == NULL", function);
return -1;
}
if (!serial->type) {
dbg("%s - serial->type == NULL!", function);
return -1;
}
return 0;
}
static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
const char *function)
{
/* if no port was specified, or it fails a paranoia check */
if (!port ||
mos7840_port_paranoia_check(port, function) ||
mos7840_serial_paranoia_check(port->serial, function)) {
/* then say that we don't have a valid usb_serial thing, which will * end up genrating -ENODEV return values */
return NULL;
}
return port->serial;
}
/*****************************************************************************
* mos7840_bulk_in_callback
* this is the callback function for when we have received data on the
* bulk in endpoint.
*****************************************************************************/
static void mos7840_bulk_in_callback(struct urb *urb)
{
int status;
unsigned char *data;
struct usb_serial *serial;
struct usb_serial_port *port;
struct moschip_port *mos7840_port;
struct tty_struct *tty;
if (!urb) {
dbg("%s", "Invalid Pointer !!!!:\n");
return;
}
if (urb->status) {
dbg("nonzero read bulk status received: %d", urb->status);
return;
}
mos7840_port = (struct moschip_port *)urb->context;
if (!mos7840_port) {
dbg("%s", "NULL mos7840_port pointer \n");
return;
}
port = (struct usb_serial_port *)mos7840_port->port;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Port Paranoia failed \n");
return;
}
serial = mos7840_get_usb_serial(port, __FUNCTION__);
if (!serial) {
dbg("%s\n", "Bad serial pointer ");
return;
}
dbg("%s\n", "Entering... \n");
data = urb->transfer_buffer;
dbg("%s", "Entering ........... \n");
if (urb->actual_length) {
tty = mos7840_port->port->tty;
if (tty) {
tty_buffer_request_room(tty, urb->actual_length);
tty_insert_flip_string(tty, data, urb->actual_length);
dbg(" %s \n", data);
tty_flip_buffer_push(tty);
}
mos7840_port->icount.rx += urb->actual_length;
dbg("mos7840_port->icount.rx is %d:\n",
mos7840_port->icount.rx);
}
if (!mos7840_port->read_urb) {
dbg("%s", "URB KILLED !!!\n");
return;
}
if (mos7840_port->read_urb->status != -EINPROGRESS) {
mos7840_port->read_urb->dev = serial->dev;
status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
if (status) {
dbg(" usb_submit_urb(read bulk) failed, status = %d",
status);
}
}
}
/*****************************************************************************
* mos7840_bulk_out_data_callback
* this is the callback function for when we have finished sending serial data
* on the bulk out endpoint.
*****************************************************************************/
static void mos7840_bulk_out_data_callback(struct urb *urb)
{
struct moschip_port *mos7840_port;
struct tty_struct *tty;
if (!urb) {
dbg("%s", "Invalid Pointer !!!!:\n");
return;
}
if (urb->status) {
dbg("nonzero write bulk status received:%d\n", urb->status);
return;
}
mos7840_port = (struct moschip_port *)urb->context;
if (!mos7840_port) {
dbg("%s", "NULL mos7840_port pointer \n");
return;
}
if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
dbg("%s", "Port Paranoia failed \n");
return;
}
dbg("%s \n", "Entering .........");
tty = mos7840_port->port->tty;
if (tty && mos7840_port->open) {
/* let the tty driver wakeup if it has a special *
* write_wakeup function */
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP))
&& tty->ldisc.write_wakeup) {
(tty->ldisc.write_wakeup) (tty);
}
/* tell the tty driver that something has changed */
wake_up_interruptible(&tty->write_wait);
}
}
/************************************************************************/
/* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
/************************************************************************/
#ifdef MCSSerialProbe
static int mos7840_serial_probe(struct usb_serial *serial,
const struct usb_device_id *id)
{
/*need to implement the mode_reg reading and updating\
structures usb_serial_ device_type\
(i.e num_ports, num_bulkin,bulkout etc) */
/* Also we can update the changes attach */
return 1;
}
#endif
/*****************************************************************************
* mos7840_open
* this function is called by the tty driver when a port is opened
* If successful, we return 0
* Otherwise we return a negative error number.
*****************************************************************************/
static int mos7840_open(struct usb_serial_port *port, struct file *filp)
{
int response;
int j;
struct usb_serial *serial;
struct urb *urb;
__u16 Data;
int status;
struct moschip_port *mos7840_port;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Port Paranoia failed \n");
return -ENODEV;
}
mos7840_num_open_ports++;
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
dbg("%s", "Serial Paranoia failed \n");
return -ENODEV;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -ENODEV;
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
/* Initialising the write urb pool */
for (j = 0; j < NUM_URBS; ++j) {
urb = usb_alloc_urb(0, SLAB_ATOMIC);
mos7840_port->write_urb_pool[j] = urb;
if (urb == NULL) {
err("No more urbs???");
continue;
}
urb->transfer_buffer = NULL;
urb->transfer_buffer =
kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
if (!urb->transfer_buffer) {
err("%s-out of memory for urb buffers.", __FUNCTION__);
continue;
}
}
/*****************************************************************************
* Initialize MCS7840 -- Write Init values to corresponding Registers
*
* Register Index
* 1 : IER
* 2 : FCR
* 3 : LCR
* 4 : MCR
*
* 0x08 : SP1/2 Control Reg
*****************************************************************************/
//NEED to check the following Block
status = 0;
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
if (status < 0) {
dbg("Reading Spreg failed\n");
return -1;
}
Data |= 0x80;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
if (status < 0) {
dbg("writing Spreg failed\n");
return -1;
}
Data &= ~0x80;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
if (status < 0) {
dbg("writing Spreg failed\n");
return -1;
}
//End of block to be checked
status = 0;
Data = 0x0;
status =
mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
if (status < 0) {
dbg("Reading Controlreg failed\n");
return -1;
}
Data |= 0x08; //Driver done bit
Data |= 0x20; //rx_disable
status = 0;
status =
mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
if (status < 0) {
dbg("writing Controlreg failed\n");
return -1;
}
//do register settings here
// Set all regs to the device default values.
////////////////////////////////////
// First Disable all interrupts.
////////////////////////////////////
Data = 0x00;
status = 0;
status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
if (status < 0) {
dbg("disableing interrupts failed\n");
return -1;
}
// Set FIFO_CONTROL_REGISTER to the default value
Data = 0x00;
status = 0;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing FIFO_CONTROL_REGISTER failed\n");
return -1;
}
Data = 0xcf;
status = 0;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing FIFO_CONTROL_REGISTER failed\n");
return -1;
}
Data = 0x03;
status = 0;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
mos7840_port->shadowLCR = Data;
Data = 0x0b;
status = 0;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
mos7840_port->shadowMCR = Data;
Data = 0x00;
status = 0;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
mos7840_port->shadowLCR = Data;
Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
status = 0;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
Data = 0x0c;
status = 0;
status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
Data = 0x0;
status = 0;
status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
Data = 0x00;
status = 0;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
Data = Data & ~SERIAL_LCR_DLAB;
status = 0;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
mos7840_port->shadowLCR = Data;
//clearing Bulkin and Bulkout Fifo
Data = 0x0;
status = 0;
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
Data = Data | 0x0c;
status = 0;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
Data = Data & ~0x0c;
status = 0;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
//Finally enable all interrupts
Data = 0x0;
Data = 0x0c;
status = 0;
status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
//clearing rx_disable
Data = 0x0;
status = 0;
status =
mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
Data = Data & ~0x20;
status = 0;
status =
mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
// rx_negate
Data = 0x0;
status = 0;
status =
mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
Data = Data | 0x10;
status = 0;
status =
mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
/* force low_latency on so that our tty_push actually forces *
* the data through,otherwise it is scheduled, and with *
* high data rates (like with OHCI) data can get lost. */
if (port->tty)
port->tty->low_latency = 1;
/* Check to see if we've set up our endpoint info yet *
* (can't set it up in mos7840_startup as the structures *
* were not set up at that time.) */
if (mos7840_num_open_ports == 1) {
if (serial->port[0]->interrupt_in_buffer == NULL) {
/* set up interrupt urb */
usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
serial->dev,
usb_rcvintpipe(serial->dev,
serial->port[0]->
interrupt_in_endpointAddress),
serial->port[0]->interrupt_in_buffer,
serial->port[0]->interrupt_in_urb->
transfer_buffer_length,
mos7840_interrupt_callback,
serial,
serial->port[0]->interrupt_in_urb->
interval);
/* start interrupt read for mos7840 *
* will continue as long as mos7840 is connected */
response =
usb_submit_urb(serial->port[0]->interrupt_in_urb,
GFP_KERNEL);
if (response) {
err("%s - Error %d submitting interrupt urb",
__FUNCTION__, response);
}
}
}
/* see if we've set up our endpoint info yet *
* (can't set it up in mos7840_startup as the *
* structures were not set up at that time.) */
dbg("port number is %d \n", port->number);
dbg("serial number is %d \n", port->serial->minor);
dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
dbg("port's number in the device is %d\n", mos7840_port->port_num);
mos7840_port->read_urb = port->read_urb;
/* set up our bulk in urb */
usb_fill_bulk_urb(mos7840_port->read_urb,
serial->dev,
usb_rcvbulkpipe(serial->dev,
port->bulk_in_endpointAddress),
port->bulk_in_buffer,
mos7840_port->read_urb->transfer_buffer_length,
mos7840_bulk_in_callback, mos7840_port);
dbg("mos7840_open: bulkin endpoint is %d\n",
port->bulk_in_endpointAddress);
response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
if (response) {
err("%s - Error %d submitting control urb", __FUNCTION__,
response);
}
/* initialize our wait queues */
init_waitqueue_head(&mos7840_port->wait_chase);
init_waitqueue_head(&mos7840_port->delta_msr_wait);
/* initialize our icount structure */
memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
/* initialize our port settings */
mos7840_port->shadowMCR = MCR_MASTER_IE; /* Must set to enable ints! */
/* send a open port command */
mos7840_port->open = 1;
//mos7840_change_port_settings(mos7840_port,old_termios);
mos7840_port->icount.tx = 0;
mos7840_port->icount.rx = 0;
dbg("\n\nusb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p\n\n", serial, mos7840_port, port);
return 0;
}
/*****************************************************************************
* mos7840_chars_in_buffer
* this function is called by the tty driver when it wants to know how many
* bytes of data we currently have outstanding in the port (data that has
* been written, but hasn't made it out the port yet)
* If successful, we return the number of bytes left to be written in the
* system,
* Otherwise we return a negative error number.
*****************************************************************************/
static int mos7840_chars_in_buffer(struct usb_serial_port *port)
{
int i;
int chars = 0;
struct moschip_port *mos7840_port;
dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return -1;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
dbg("%s \n", "mos7840_break:leaving ...........");
return -1;
}
for (i = 0; i < NUM_URBS; ++i) {
if (mos7840_port->write_urb_pool[i]->status == -EINPROGRESS) {
chars += URB_TRANSFER_BUFFER_SIZE;
}
}
dbg("%s - returns %d", __FUNCTION__, chars);
return (chars);
}
/************************************************************************
*
* mos7840_block_until_tx_empty
*
* This function will block the close until one of the following:
* 1. TX count are 0
* 2. The mos7840 has stopped
* 3. A timout of 3 seconds without activity has expired
*
************************************************************************/
static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
{
int timeout = HZ / 10;
int wait = 30;
int count;
while (1) {
count = mos7840_chars_in_buffer(mos7840_port->port);
/* Check for Buffer status */
if (count <= 0) {
return;
}
/* Block the thread for a while */
interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
timeout);
/* No activity.. count down section */
wait--;
if (wait == 0) {
dbg("%s - TIMEOUT", __FUNCTION__);
return;
} else {
/* Reset timout value back to seconds */
wait = 30;
}
}
}
/*****************************************************************************
* mos7840_close
* this function is called by the tty driver when a port is closed
*****************************************************************************/
static void mos7840_close(struct usb_serial_port *port, struct file *filp)
{
struct usb_serial *serial;
struct moschip_port *mos7840_port;
int j;
__u16 Data;
dbg("%s\n", "mos7840_close:entering...");
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Port Paranoia failed \n");
return;
}
serial = mos7840_get_usb_serial(port, __FUNCTION__);
if (!serial) {
dbg("%s", "Serial Paranoia failed \n");
return;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
return;
}
for (j = 0; j < NUM_URBS; ++j)
usb_kill_urb(mos7840_port->write_urb_pool[j]);
/* Freeing Write URBs */
for (j = 0; j < NUM_URBS; ++j) {
if (mos7840_port->write_urb_pool[j]) {
if (mos7840_port->write_urb_pool[j]->transfer_buffer)
kfree(mos7840_port->write_urb_pool[j]->
transfer_buffer);
usb_free_urb(mos7840_port->write_urb_pool[j]);
}
}
if (serial->dev) {
/* flush and block until tx is empty */
mos7840_block_until_tx_empty(mos7840_port);
}
/* While closing port, shutdown all bulk read, write *
* and interrupt read if they exists */
if (serial->dev) {
if (mos7840_port->write_urb) {
dbg("%s", "Shutdown bulk write\n");
usb_kill_urb(mos7840_port->write_urb);
}
if (mos7840_port->read_urb) {
dbg("%s", "Shutdown bulk read\n");
usb_kill_urb(mos7840_port->read_urb);
}
if ((&mos7840_port->control_urb)) {
dbg("%s", "Shutdown control read\n");
// usb_kill_urb (mos7840_port->control_urb);
}
}
// if(mos7840_port->ctrl_buf != NULL)
// kfree(mos7840_port->ctrl_buf);
mos7840_num_open_ports--;
dbg("mos7840_num_open_ports in close%d:in port%d\n",
mos7840_num_open_ports, port->number);
if (mos7840_num_open_ports == 0) {
if (serial->port[0]->interrupt_in_urb) {
dbg("%s", "Shutdown interrupt_in_urb\n");
}
}
if (mos7840_port->write_urb) {
/* if this urb had a transfer buffer already (old tx) free it */
if (mos7840_port->write_urb->transfer_buffer != NULL) {
kfree(mos7840_port->write_urb->transfer_buffer);
}
usb_free_urb(mos7840_port->write_urb);
}
Data = 0x0;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
Data = 0x00;
mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
mos7840_port->open = 0;
dbg("%s \n", "Leaving ............");
}
/************************************************************************
*
* mos7840_block_until_chase_response
*
* This function will block the close until one of the following:
* 1. Response to our Chase comes from mos7840
* 2. A timout of 10 seconds without activity has expired
* (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
*
************************************************************************/
static void mos7840_block_until_chase_response(struct moschip_port
*mos7840_port)
{
int timeout = 1 * HZ;
int wait = 10;
int count;
while (1) {
count = mos7840_chars_in_buffer(mos7840_port->port);
/* Check for Buffer status */
if (count <= 0) {
return;
}
/* Block the thread for a while */
interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
timeout);
/* No activity.. count down section */
wait--;
if (wait == 0) {
dbg("%s - TIMEOUT", __FUNCTION__);
return;
} else {
/* Reset timout value back to seconds */
wait = 10;
}
}
}
/*****************************************************************************
* mos7840_break
* this function sends a break to the port
*****************************************************************************/
static void mos7840_break(struct usb_serial_port *port, int break_state)
{
unsigned char data;
struct usb_serial *serial;
struct moschip_port *mos7840_port;
dbg("%s \n", "Entering ...........");
dbg("mos7840_break: Start\n");
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Port Paranoia failed \n");
return;
}
serial = mos7840_get_usb_serial(port, __FUNCTION__);
if (!serial) {
dbg("%s", "Serial Paranoia failed \n");
return;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
return;
}
if (serial->dev) {
/* flush and block until tx is empty */
mos7840_block_until_chase_response(mos7840_port);
}
if (break_state == -1) {
data = mos7840_port->shadowLCR | LCR_SET_BREAK;
} else {
data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
}
mos7840_port->shadowLCR = data;
dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
mos7840_port->shadowLCR);
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
mos7840_port->shadowLCR);
return;
}
/*****************************************************************************
* mos7840_write_room
* this function is called by the tty driver when it wants to know how many
* bytes of data we can accept for a specific port.
* If successful, we return the amount of room that we have for this port
* Otherwise we return a negative error number.
*****************************************************************************/
static int mos7840_write_room(struct usb_serial_port *port)
{
int i;
int room = 0;
struct moschip_port *mos7840_port;
dbg("%s \n", " mos7840_write_room:entering ...........");
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
dbg("%s \n", " mos7840_write_room:leaving ...........");
return -1;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
dbg("%s \n", "mos7840_break:leaving ...........");
return -1;
}
for (i = 0; i < NUM_URBS; ++i) {
if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
room += URB_TRANSFER_BUFFER_SIZE;
}
}
dbg("%s - returns %d", __FUNCTION__, room);
return (room);
}
/*****************************************************************************
* mos7840_write
* this function is called by the tty driver when data should be written to
* the port.
* If successful, we return the number of bytes written, otherwise we
* return a negative error number.
*****************************************************************************/
static int mos7840_write(struct usb_serial_port *port,
const unsigned char *data, int count)
{
int status;
int i;
int bytes_sent = 0;
int transfer_size;
struct moschip_port *mos7840_port;
struct usb_serial *serial;
struct urb *urb;
//__u16 Data;
const unsigned char *current_position = data;
unsigned char *data1;
dbg("%s \n", "entering ...........");
//dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
#ifdef NOTMOS7840
Data = 0x00;
status = 0;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
mos7840_port->shadowLCR = Data;
dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
mos7840_port->shadowLCR);
//Data = 0x03;
//status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
//mos7840_port->shadowLCR=Data;//Need to add later
Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
status = 0;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
//Data = 0x0c;
//status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
Data = 0x00;
status = 0;
status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
dbg("mos7840_write:DLL value is %x\n", Data);
Data = 0x0;
status = 0;
status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
dbg("mos7840_write:DLM value is %x\n", Data);
Data = Data & ~SERIAL_LCR_DLAB;
dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
mos7840_port->shadowLCR);
status = 0;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
#endif
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Port Paranoia failed \n");
return -1;
}
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
dbg("%s", "Serial Paranoia failed \n");
return -1;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL) {
dbg("%s", "mos7840_port is NULL\n");
return -1;
}
/* try to find a free urb in the list */
urb = NULL;
for (i = 0; i < NUM_URBS; ++i) {
if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
urb = mos7840_port->write_urb_pool[i];
dbg("\nURB:%d", i);
break;
}
}
if (urb == NULL) {
dbg("%s - no more free urbs", __FUNCTION__);
goto exit;
}
if (urb->transfer_buffer == NULL) {
urb->transfer_buffer =
kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
if (urb->transfer_buffer == NULL) {
err("%s no more kernel memory...", __FUNCTION__);
goto exit;
}
}
transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
memcpy(urb->transfer_buffer, current_position, transfer_size);
/* fill urb with data and submit */
usb_fill_bulk_urb(urb,
serial->dev,
usb_sndbulkpipe(serial->dev,
port->bulk_out_endpointAddress),
urb->transfer_buffer,
transfer_size,
mos7840_bulk_out_data_callback, mos7840_port);
data1 = urb->transfer_buffer;
dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
/* send it down the pipe */
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
err("%s - usb_submit_urb(write bulk) failed with status = %d",
__FUNCTION__, status);
bytes_sent = status;
goto exit;
}
bytes_sent = transfer_size;
mos7840_port->icount.tx += transfer_size;
dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
exit:
return bytes_sent;
}
/*****************************************************************************
* mos7840_throttle
* this function is called by the tty driver when it wants to stop the data
* being read from the port.
*****************************************************************************/
static void mos7840_throttle(struct usb_serial_port *port)
{
struct moschip_port *mos7840_port;
struct tty_struct *tty;
int status;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return;
}
dbg("- port %d\n", port->number);
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dbg("%s\n", "port not opened");
return;
}
dbg("%s", "Entering .......... \n");
tty = port->tty;
if (!tty) {
dbg("%s - no tty available", __FUNCTION__);
return;
}
/* if we are implementing XON/XOFF, send the stop character */
if (I_IXOFF(tty)) {
unsigned char stop_char = STOP_CHAR(tty);
status = mos7840_write(port, &stop_char, 1);
if (status <= 0) {
return;
}
}
/* if we are implementing RTS/CTS, toggle that line */
if (tty->termios->c_cflag & CRTSCTS) {
mos7840_port->shadowMCR &= ~MCR_RTS;
status = 0;
status =
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
mos7840_port->shadowMCR);
if (status < 0) {
return;
}
}
return;
}
/*****************************************************************************
* mos7840_unthrottle
* this function is called by the tty driver when it wants to resume the data
* being read from the port (called after SerialThrottle is called)
*****************************************************************************/
static void mos7840_unthrottle(struct usb_serial_port *port)
{
struct tty_struct *tty;
int status;
struct moschip_port *mos7840_port = mos7840_get_port_private(port);
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return;
}
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return;
}
dbg("%s", "Entering .......... \n");
tty = port->tty;
if (!tty) {
dbg("%s - no tty available", __FUNCTION__);
return;
}
/* if we are implementing XON/XOFF, send the start character */
if (I_IXOFF(tty)) {
unsigned char start_char = START_CHAR(tty);
status = mos7840_write(port, &start_char, 1);
if (status <= 0) {
return;
}
}
/* if we are implementing RTS/CTS, toggle that line */
if (tty->termios->c_cflag & CRTSCTS) {
mos7840_port->shadowMCR |= MCR_RTS;
status = 0;
status =
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
mos7840_port->shadowMCR);
if (status < 0) {
return;
}
}
return;
}
static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
{
struct moschip_port *mos7840_port;
unsigned int result;
__u16 msr;
__u16 mcr;
int status = 0;
mos7840_port = mos7840_get_port_private(port);
dbg("%s - port %d", __FUNCTION__, port->number);
if (mos7840_port == NULL)
return -ENODEV;
status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
| ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
| ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
| ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
| ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
| ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
| ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
dbg("%s - 0x%04X", __FUNCTION__, result);
return result;
}
static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear)
{
struct moschip_port *mos7840_port;
unsigned int mcr;
unsigned int status;
dbg("%s - port %d", __FUNCTION__, port->number);
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -ENODEV;
mcr = mos7840_port->shadowMCR;
if (clear & TIOCM_RTS)
mcr &= ~MCR_RTS;
if (clear & TIOCM_DTR)
mcr &= ~MCR_DTR;
if (clear & TIOCM_LOOP)
mcr &= ~MCR_LOOPBACK;
if (set & TIOCM_RTS)
mcr |= MCR_RTS;
if (set & TIOCM_DTR)
mcr |= MCR_DTR;
if (set & TIOCM_LOOP)
mcr |= MCR_LOOPBACK;
mos7840_port->shadowMCR = mcr;
status = 0;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
if (status < 0) {
dbg("setting MODEM_CONTROL_REGISTER Failed\n");
return -1;
}
return 0;
}
/*****************************************************************************
* mos7840_calc_baud_rate_divisor
* this function calculates the proper baud rate divisor for the specified
* baud rate.
*****************************************************************************/
static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
__u16 * clk_sel_val)
{
dbg("%s - %d", __FUNCTION__, baudRate);
if (baudRate <= 115200) {
*divisor = 115200 / baudRate;
*clk_sel_val = 0x0;
}
if ((baudRate > 115200) && (baudRate <= 230400)) {
*divisor = 230400 / baudRate;
*clk_sel_val = 0x10;
} else if ((baudRate > 230400) && (baudRate <= 403200)) {
*divisor = 403200 / baudRate;
*clk_sel_val = 0x20;
} else if ((baudRate > 403200) && (baudRate <= 460800)) {
*divisor = 460800 / baudRate;
*clk_sel_val = 0x30;
} else if ((baudRate > 460800) && (baudRate <= 806400)) {
*divisor = 806400 / baudRate;
*clk_sel_val = 0x40;
} else if ((baudRate > 806400) && (baudRate <= 921600)) {
*divisor = 921600 / baudRate;
*clk_sel_val = 0x50;
} else if ((baudRate > 921600) && (baudRate <= 1572864)) {
*divisor = 1572864 / baudRate;
*clk_sel_val = 0x60;
} else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
*divisor = 3145728 / baudRate;
*clk_sel_val = 0x70;
}
return 0;
#ifdef NOTMCS7840
for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
if (mos7840_divisor_table[i].BaudRate == baudrate) {
*divisor = mos7840_divisor_table[i].Divisor;
return 0;
}
}
/* After trying for all the standard baud rates *
* Try calculating the divisor for this baud rate */
if (baudrate > 75 && baudrate < 230400) {
/* get the divisor */
custom = (__u16) (230400L / baudrate);
/* Check for round off */
round1 = (__u16) (2304000L / baudrate);
round = (__u16) (round1 - (custom * 10));
if (round > 4) {
custom++;
}
*divisor = custom;
dbg(" Baud %d = %d\n", baudrate, custom);
return 0;
}
dbg("%s\n", " Baud calculation Failed...");
return -1;
#endif
}
/*****************************************************************************
* mos7840_send_cmd_write_baud_rate
* this function sends the proper command to change the baud rate of the
* specified port.
*****************************************************************************/
static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
int baudRate)
{
int divisor = 0;
int status;
__u16 Data;
unsigned char number;
__u16 clk_sel_val;
struct usb_serial_port *port;
if (mos7840_port == NULL)
return -1;
port = (struct usb_serial_port *)mos7840_port->port;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return -1;
}
if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
dbg("%s", "Invalid Serial \n");
return -1;
}
dbg("%s", "Entering .......... \n");
number = mos7840_port->port->number - mos7840_port->port->serial->minor;
dbg("%s - port = %d, baud = %d", __FUNCTION__,
mos7840_port->port->number, baudRate);
//reset clk_uart_sel in spregOffset
if (baudRate > 115200) {
#ifdef HW_flow_control
//NOTE: need to see the pther register to modify
//setting h/w flow control bit to 1;
status = 0;
Data = 0x2b;
mos7840_port->shadowMCR = Data;
status =
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing spreg failed in set_serial_baud\n");
return -1;
}
#endif
} else {
#ifdef HW_flow_control
//setting h/w flow control bit to 0;
status = 0;
Data = 0xb;
mos7840_port->shadowMCR = Data;
status =
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing spreg failed in set_serial_baud\n");
return -1;
}
#endif
}
if (1) //baudRate <= 115200)
{
clk_sel_val = 0x0;
Data = 0x0;
status = 0;
status =
mos7840_calc_baud_rate_divisor(baudRate, &divisor,
&clk_sel_val);
status =
mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
&Data);
if (status < 0) {
dbg("reading spreg failed in set_serial_baud\n");
return -1;
}
Data = (Data & 0x8f) | clk_sel_val;
status = 0;
status =
mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
if (status < 0) {
dbg("Writing spreg failed in set_serial_baud\n");
return -1;
}
/* Calculate the Divisor */
if (status) {
err("%s - bad baud rate", __FUNCTION__);
dbg("%s\n", "bad baud rate");
return status;
}
/* Enable access to divisor latch */
Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
mos7840_port->shadowLCR = Data;
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
/* Write the divisor */
Data = (unsigned char)(divisor & 0xff);
dbg("set_serial_baud Value to write DLL is %x\n", Data);
mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
Data = (unsigned char)((divisor & 0xff00) >> 8);
dbg("set_serial_baud Value to write DLM is %x\n", Data);
mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
/* Disable access to divisor latch */
Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
mos7840_port->shadowLCR = Data;
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
}
return status;
}
/*****************************************************************************
* mos7840_change_port_settings
* This routine is called to set the UART on the device to match
* the specified new settings.
*****************************************************************************/
static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
struct termios *old_termios)
{
struct tty_struct *tty;
int baud;
unsigned cflag;
unsigned iflag;
__u8 lData;
__u8 lParity;
__u8 lStop;
int status;
__u16 Data;
struct usb_serial_port *port;
struct usb_serial *serial;
if (mos7840_port == NULL)
return;
port = (struct usb_serial_port *)mos7840_port->port;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return;
}
if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
dbg("%s", "Invalid Serial \n");
return;
}
serial = port->serial;
dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
if (!mos7840_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return;
}
tty = mos7840_port->port->tty;
if ((!tty) || (!tty->termios)) {
dbg("%s - no tty structures", __FUNCTION__);
return;
}
dbg("%s", "Entering .......... \n");
lData = LCR_BITS_8;
lStop = LCR_STOP_1;
lParity = LCR_PAR_NONE;
cflag = tty->termios->c_cflag;
iflag = tty->termios->c_iflag;
/* Change the number of bits */
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
case CS5:
lData = LCR_BITS_5;
break;
case CS6:
lData = LCR_BITS_6;
break;
case CS7:
lData = LCR_BITS_7;
break;
default:
case CS8:
lData = LCR_BITS_8;
break;
}
}
/* Change the Parity bit */
if (cflag & PARENB) {
if (cflag & PARODD) {
lParity = LCR_PAR_ODD;
dbg("%s - parity = odd", __FUNCTION__);
} else {
lParity = LCR_PAR_EVEN;
dbg("%s - parity = even", __FUNCTION__);
}
} else {
dbg("%s - parity = none", __FUNCTION__);
}
if (cflag & CMSPAR) {
lParity = lParity | 0x20;
}
/* Change the Stop bit */
if (cflag & CSTOPB) {
lStop = LCR_STOP_2;
dbg("%s - stop bits = 2", __FUNCTION__);
} else {
lStop = LCR_STOP_1;
dbg("%s - stop bits = 1", __FUNCTION__);
}
/* Update the LCR with the correct value */
mos7840_port->shadowLCR &=
~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
mos7840_port->shadowLCR |= (lData | lParity | lStop);
dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
mos7840_port->shadowLCR);
/* Disable Interrupts */
Data = 0x00;
mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
Data = 0x00;
mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
Data = 0xcf;
mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
/* Send the updated LCR value to the mos7840 */
Data = mos7840_port->shadowLCR;
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
Data = 0x00b;
mos7840_port->shadowMCR = Data;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
Data = 0x00b;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
/* set up the MCR register and send it to the mos7840 */
mos7840_port->shadowMCR = MCR_MASTER_IE;
if (cflag & CBAUD) {
mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
}
if (cflag & CRTSCTS) {
mos7840_port->shadowMCR |= (MCR_XON_ANY);
} else {
mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
}
Data = mos7840_port->shadowMCR;
mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(tty);
if (!baud) {
/* pick a default, any default... */
dbg("%s\n", "Picked default baud...");
baud = 9600;
}
dbg("%s - baud rate = %d", __FUNCTION__, baud);
status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
/* Enable Interrupts */
Data = 0x0c;
mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
if (mos7840_port->read_urb->status != -EINPROGRESS) {
mos7840_port->read_urb->dev = serial->dev;
status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
if (status) {
dbg(" usb_submit_urb(read bulk) failed, status = %d",
status);
}
}
wake_up(&mos7840_port->delta_msr_wait);
mos7840_port->delta_msr_cond = 1;
dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
mos7840_port->shadowLCR);
return;
}
/*****************************************************************************
* mos7840_set_termios
* this function is called by the tty driver when it wants to change
* the termios structure
*****************************************************************************/
static void mos7840_set_termios(struct usb_serial_port *port,
struct termios *old_termios)
{
int status;
unsigned int cflag;
struct usb_serial *serial;
struct moschip_port *mos7840_port;
struct tty_struct *tty;
dbg("mos7840_set_termios: START\n");
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return;
}
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
dbg("%s", "Invalid Serial \n");
return;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
tty = port->tty;
if (!port->tty || !port->tty->termios) {
dbg("%s - no tty or termios", __FUNCTION__);
return;
}
if (!mos7840_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return;
}
dbg("%s\n", "setting termios - ");
cflag = tty->termios->c_cflag;
if (!cflag) {
dbg("%s %s\n", __FUNCTION__, "cflag is NULL");
return;
}
/* check that they really want us to change something */
if (old_termios) {
if ((cflag == old_termios->c_cflag) &&
(RELEVANT_IFLAG(tty->termios->c_iflag) ==
RELEVANT_IFLAG(old_termios->c_iflag))) {
dbg("%s\n", "Nothing to change");
return;
}
}
dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
if (old_termios) {
dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
}
dbg("%s - port %d", __FUNCTION__, port->number);
/* change the port settings to the new ones specified */
mos7840_change_port_settings(mos7840_port, old_termios);
if (!mos7840_port->read_urb) {
dbg("%s", "URB KILLED !!!!!\n");
return;
}
if (mos7840_port->read_urb->status != -EINPROGRESS) {
mos7840_port->read_urb->dev = serial->dev;
status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
if (status) {
dbg(" usb_submit_urb(read bulk) failed, status = %d",
status);
}
}
return;
}
/*****************************************************************************
* mos7840_get_lsr_info - get line status register info
*
* Purpose: Let user call ioctl() to get info when the UART physically
* is emptied. On bus types like RS485, the transmitter must
* release the bus after transmitting. This must be done when
* the transmit shift register is empty, not be done when the
* transmit holding register is empty. This functionality
* allows an RS485 driver to be written in user space.
*****************************************************************************/
static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
unsigned int __user *value)
{
int count;
unsigned int result = 0;
count = mos7840_chars_in_buffer(mos7840_port->port);
if (count == 0) {
dbg("%s -- Empty", __FUNCTION__);
result = TIOCSER_TEMT;
}
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
/*****************************************************************************
* mos7840_get_bytes_avail - get number of bytes available
*
* Purpose: Let user call ioctl to get the count of number of bytes available.
*****************************************************************************/
static int mos7840_get_bytes_avail(struct moschip_port *mos7840_port,
unsigned int __user *value)
{
unsigned int result = 0;
struct tty_struct *tty = mos7840_port->port->tty;
if (!tty)
return -ENOIOCTLCMD;
result = tty->read_cnt;
dbg("%s(%d) = %d", __FUNCTION__, mos7840_port->port->number, result);
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return -ENOIOCTLCMD;
}
/*****************************************************************************
* mos7840_set_modem_info
* function to set modem info
*****************************************************************************/
static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
unsigned int cmd, unsigned int __user *value)
{
unsigned int mcr;
unsigned int arg;
__u16 Data;
int status;
struct usb_serial_port *port;
if (mos7840_port == NULL)
return -1;
port = (struct usb_serial_port *)mos7840_port->port;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return -1;
}
mcr = mos7840_port->shadowMCR;
if (copy_from_user(&arg, value, sizeof(int)))
return -EFAULT;
switch (cmd) {
case TIOCMBIS:
if (arg & TIOCM_RTS)
mcr |= MCR_RTS;
if (arg & TIOCM_DTR)
mcr |= MCR_RTS;
if (arg & TIOCM_LOOP)
mcr |= MCR_LOOPBACK;
break;
case TIOCMBIC:
if (arg & TIOCM_RTS)
mcr &= ~MCR_RTS;
if (arg & TIOCM_DTR)
mcr &= ~MCR_RTS;
if (arg & TIOCM_LOOP)
mcr &= ~MCR_LOOPBACK;
break;
case TIOCMSET:
/* turn off the RTS and DTR and LOOPBACK
* and then only turn on what was asked to */
mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
break;
}
mos7840_port->shadowMCR = mcr;
Data = mos7840_port->shadowMCR;
status = 0;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("setting MODEM_CONTROL_REGISTER Failed\n");
return -1;
}
return 0;
}
/*****************************************************************************
* mos7840_get_modem_info
* function to get modem info
*****************************************************************************/
static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
unsigned int __user *value)
{
unsigned int result = 0;
__u16 msr;
unsigned int mcr = mos7840_port->shadowMCR;
int status = 0;
status =
mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
&msr);
result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
|((mcr & MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
|((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
|((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0) /* 0x040 */
|((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
|((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
dbg("%s -- %x", __FUNCTION__, result);
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
/*****************************************************************************
* mos7840_get_serial_info
* function to get information about serial port
*****************************************************************************/
static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
struct serial_struct __user *retinfo)
{
struct serial_struct tmp;
if (mos7840_port == NULL)
return -1;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = PORT_16550A;
tmp.line = mos7840_port->port->serial->minor;
tmp.port = mos7840_port->port->number;
tmp.irq = 0;
tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
tmp.baud_base = 9600;
tmp.close_delay = 5 * HZ;
tmp.closing_wait = 30 * HZ;
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
/*****************************************************************************
* SerialIoctl
* this function handles any ioctl calls to the driver
*****************************************************************************/
static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct moschip_port *mos7840_port;
struct tty_struct *tty;
struct async_icount cnow;
struct async_icount cprev;
struct serial_icounter_struct icount;
int mosret = 0;
int retval;
struct tty_ldisc *ld;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Invalid port \n");
return -1;
}
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -1;
tty = mos7840_port->port->tty;
dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
switch (cmd) {
/* return number of bytes available */
case TIOCINQ:
dbg("%s (%d) TIOCINQ", __FUNCTION__, port->number);
return mos7840_get_bytes_avail(mos7840_port, argp);
case TIOCOUTQ:
dbg("%s (%d) TIOCOUTQ", __FUNCTION__, port->number);
return put_user(tty->driver->chars_in_buffer ?
tty->driver->chars_in_buffer(tty) : 0,
(int __user *)arg);
case TCFLSH:
retval = tty_check_change(tty);
if (retval)
return retval;
ld = tty_ldisc_ref(tty);
switch (arg) {
case TCIFLUSH:
if (ld && ld->flush_buffer)
ld->flush_buffer(tty);
break;
case TCIOFLUSH:
if (ld && ld->flush_buffer)
ld->flush_buffer(tty);
/* fall through */
case TCOFLUSH:
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
break;
default:
tty_ldisc_deref(ld);
return -EINVAL;
}
tty_ldisc_deref(ld);
return 0;
case TCGETS:
if (kernel_termios_to_user_termios
((struct termios __user *)argp, tty->termios))
return -EFAULT;
return 0;
case TIOCSERGETLSR:
dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
return mos7840_get_lsr_info(mos7840_port, argp);
return 0;
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
port->number);
mosret =
mos7840_set_modem_info(mos7840_port, cmd, argp);
return mosret;
case TIOCMGET:
dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
return mos7840_get_modem_info(mos7840_port, argp);
case TIOCGSERIAL:
dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
return mos7840_get_serial_info(mos7840_port, argp);
case TIOCSSERIAL:
dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
break;
case TIOCMIWAIT:
dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
cprev = mos7840_port->icount;
while (1) {
//interruptible_sleep_on(&mos7840_port->delta_msr_wait);
mos7840_port->delta_msr_cond = 0;
wait_event_interruptible(mos7840_port->delta_msr_wait,
(mos7840_port->
delta_msr_cond == 1));
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
cnow = mos7840_port->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;
}
/* NOTREACHED */
break;
case TIOCGICOUNT:
cnow = mos7840_port->icount;
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
port->number, icount.rx, icount.tx);
if (copy_to_user(argp, &icount, sizeof(icount)))
return -EFAULT;
return 0;
case TIOCEXBAUD:
return 0;
default:
break;
}
return -ENOIOCTLCMD;
}
static int mos7840_calc_num_ports(struct usb_serial *serial)
{
dbg("numberofendpoints: %d \n",
(int)serial->interface->cur_altsetting->desc.bNumEndpoints);
dbg("numberofendpoints: %d \n",
(int)serial->interface->altsetting->desc.bNumEndpoints);
if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
mos7840_num_ports = 2;
serial->type->num_ports = 2;
} else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
mos7840_num_ports = 4;
serial->type->num_bulk_in = 4;
serial->type->num_bulk_out = 4;
serial->type->num_ports = 4;
}
return mos7840_num_ports;
}
/****************************************************************************
* mos7840_startup
****************************************************************************/
static int mos7840_startup(struct usb_serial *serial)
{
struct moschip_port *mos7840_port;
struct usb_device *dev;
int i, status;
__u16 Data;
dbg("%s \n", " mos7840_startup :entering..........");
if (!serial) {
dbg("%s\n", "Invalid Handler");
return -1;
}
dev = serial->dev;
dbg("%s\n", "Entering...");
/* we set up the pointers to the endpoints in the mos7840_open *
* function, as the structures aren't created yet. */
/* set up port private structures */
for (i = 0; i < serial->num_ports; ++i) {
mos7840_port = kmalloc(sizeof(struct moschip_port), GFP_KERNEL);
if (mos7840_port == NULL) {
err("%s - Out of memory", __FUNCTION__);
return -ENOMEM;
}
memset(mos7840_port, 0, sizeof(struct moschip_port));
/* Initialize all port interrupt end point to port 0 int endpoint *
* Our device has only one interrupt end point comman to all port */
mos7840_port->port = serial->port[i];
mos7840_set_port_private(serial->port[i], mos7840_port);
mos7840_port->port_num = ((serial->port[i]->number -
(serial->port[i]->serial->minor)) +
1);
if (mos7840_port->port_num == 1) {
mos7840_port->SpRegOffset = 0x0;
mos7840_port->ControlRegOffset = 0x1;
mos7840_port->DcrRegOffset = 0x4;
} else if ((mos7840_port->port_num == 2)
&& (mos7840_num_ports == 4)) {
mos7840_port->SpRegOffset = 0x8;
mos7840_port->ControlRegOffset = 0x9;
mos7840_port->DcrRegOffset = 0x16;
} else if ((mos7840_port->port_num == 2)
&& (mos7840_num_ports == 2)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 3)
&& (mos7840_num_ports == 4)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 4)
&& (mos7840_num_ports == 4)) {
mos7840_port->SpRegOffset = 0xc;
mos7840_port->ControlRegOffset = 0xd;
mos7840_port->DcrRegOffset = 0x1c;
}
mos7840_dump_serial_port(mos7840_port);
mos7840_set_port_private(serial->port[i], mos7840_port);
//enable rx_disable bit in control register
status =
mos7840_get_reg_sync(serial->port[i],
mos7840_port->ControlRegOffset, &Data);
if (status < 0) {
dbg("Reading ControlReg failed status-0x%x\n", status);
break;
} else
dbg("ControlReg Reading success val is %x, status%d\n",
Data, status);
Data |= 0x08; //setting driver done bit
Data |= 0x04; //sp1_bit to have cts change reflect in modem status reg
//Data |= 0x20; //rx_disable bit
status = 0;
status =
mos7840_set_reg_sync(serial->port[i],
mos7840_port->ControlRegOffset, Data);
if (status < 0) {
dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
break;
} else
dbg("ControlReg Writing success(rx_disable) status%d\n",
status);
//Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
Data = 0x01;
status = 0;
status =
mos7840_set_reg_sync(serial->port[i],
(__u16) (mos7840_port->DcrRegOffset +
0), Data);
if (status < 0) {
dbg("Writing DCR0 failed status-0x%x\n", status);
break;
} else
dbg("DCR0 Writing success status%d\n", status);
Data = 0x05;
status = 0;
status =
mos7840_set_reg_sync(serial->port[i],
(__u16) (mos7840_port->DcrRegOffset +
1), Data);
if (status < 0) {
dbg("Writing DCR1 failed status-0x%x\n", status);
break;
} else
dbg("DCR1 Writing success status%d\n", status);
Data = 0x24;
status = 0;
status =
mos7840_set_reg_sync(serial->port[i],
(__u16) (mos7840_port->DcrRegOffset +
2), Data);
if (status < 0) {
dbg("Writing DCR2 failed status-0x%x\n", status);
break;
} else
dbg("DCR2 Writing success status%d\n", status);
// write values in clkstart0x0 and clkmulti 0x20
Data = 0x0;
status = 0;
status =
mos7840_set_reg_sync(serial->port[i],
CLK_START_VALUE_REGISTER, Data);
if (status < 0) {
dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
break;
} else
dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
Data = 0x20;
status = 0;
status =
mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
Data);
if (status < 0) {
dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
status);
break;
} else
dbg("CLK_MULTI_REGISTER Writing success status%d\n",
status);
//write value 0x0 to scratchpad register
Data = 0x00;
status = 0;
status =
mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
Data);
if (status < 0) {
dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
status);
break;
} else
dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
status);
//Zero Length flag register
if ((mos7840_port->port_num != 1)
&& (mos7840_num_ports == 2)) {
Data = 0xff;
status = 0;
status = mos7840_set_reg_sync(serial->port[i],
(__u16) (ZLP_REG1 +
((__u16)
mos7840_port->
port_num)),
Data);
dbg("ZLIP offset%x\n",
(__u16) (ZLP_REG1 +
((__u16) mos7840_port->port_num)));
if (status < 0) {
dbg("Writing ZLP_REG%d failed status-0x%x\n",
i + 2, status);
break;
} else
dbg("ZLP_REG%d Writing success status%d\n",
i + 2, status);
} else {
Data = 0xff;
status = 0;
status = mos7840_set_reg_sync(serial->port[i],
(__u16) (ZLP_REG1 +
((__u16)
mos7840_port->
port_num) -
0x1), Data);
dbg("ZLIP offset%x\n",
(__u16) (ZLP_REG1 +
((__u16) mos7840_port->port_num) - 0x1));
if (status < 0) {
dbg("Writing ZLP_REG%d failed status-0x%x\n",
i + 1, status);
break;
} else
dbg("ZLP_REG%d Writing success status%d\n",
i + 1, status);
}
mos7840_port->control_urb = usb_alloc_urb(0, SLAB_ATOMIC);
mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
}
//Zero Length flag enable
Data = 0x0f;
status = 0;
status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
if (status < 0) {
dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
return -1;
} else
dbg("ZLP_REG5 Writing success status%d\n", status);
/* setting configuration feature to one */
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
(__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
return 0;
}
/****************************************************************************
* mos7840_shutdown
* This function is called whenever the device is removed from the usb bus.
****************************************************************************/
static void mos7840_shutdown(struct usb_serial *serial)
{
int i;
struct moschip_port *mos7840_port;
dbg("%s \n", " shutdown :entering..........");
if (!serial) {
dbg("%s", "Invalid Handler \n");
return;
}
/* check for the ports to be closed,close the ports and disconnect */
/* free private structure allocated for serial port *
* stop reads and writes on all ports */
for (i = 0; i < serial->num_ports; ++i) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
kfree(mos7840_port->ctrl_buf);
usb_kill_urb(mos7840_port->control_urb);
kfree(mos7840_port);
mos7840_set_port_private(serial->port[i], NULL);
}
dbg("%s\n", "Thank u :: ");
}
static struct usb_serial_driver moschip7840_4port_device = {
.driver = {
.owner = THIS_MODULE,
.name = "mos7840",
},
.description = DRIVER_DESC,
.id_table = moschip_port_id_table,
.num_interrupt_in = 1, //NUM_DONT_CARE,//1,
#ifdef check
.num_bulk_in = 4,
.num_bulk_out = 4,
.num_ports = 4,
#endif
.open = mos7840_open,
.close = mos7840_close,
.write = mos7840_write,
.write_room = mos7840_write_room,
.chars_in_buffer = mos7840_chars_in_buffer,
.throttle = mos7840_throttle,
.unthrottle = mos7840_unthrottle,
.calc_num_ports = mos7840_calc_num_ports,
#ifdef MCSSerialProbe
.probe = mos7840_serial_probe,
#endif
.ioctl = mos7840_ioctl,
.set_termios = mos7840_set_termios,
.break_ctl = mos7840_break,
.tiocmget = mos7840_tiocmget,
.tiocmset = mos7840_tiocmset,
.attach = mos7840_startup,
.shutdown = mos7840_shutdown,
.read_bulk_callback = mos7840_bulk_in_callback,
.read_int_callback = mos7840_interrupt_callback,
};
static struct usb_driver io_driver = {
.name = "mos7840",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = moschip_id_table_combined,
};
/****************************************************************************
* moschip7840_init
* This is called by the module subsystem, or on startup to initialize us
****************************************************************************/
static int __init moschip7840_init(void)
{
int retval;
dbg("%s \n", " mos7840_init :entering..........");
/* Register with the usb serial */
retval = usb_serial_register(&moschip7840_4port_device);
if (retval)
goto failed_port_device_register;
dbg("%s\n", "Entring...");
info(DRIVER_DESC " " DRIVER_VERSION);
/* Register with the usb */
retval = usb_register(&io_driver);
if (retval)
goto failed_usb_register;
if (retval == 0) {
dbg("%s\n", "Leaving...");
return 0;
}
failed_usb_register:
usb_serial_deregister(&moschip7840_4port_device);
failed_port_device_register:
return retval;
}
/****************************************************************************
* moschip7840_exit
* Called when the driver is about to be unloaded.
****************************************************************************/
static void __exit moschip7840_exit(void)
{
dbg("%s \n", " mos7840_exit :entering..........");
usb_deregister(&io_driver);
usb_serial_deregister(&moschip7840_4port_device);
dbg("%s\n", "Entring...");
}
module_init(moschip7840_init);
module_exit(moschip7840_exit);
/* Module information */
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
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