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linux/drivers/usb/serial/mos7840.c
Geyslan G. Bem 365a0442f6 USB: mos7840: remove redundant condition 
This patch removes redundant condition.

 (length && length > 5) can be reduced to a single evaluation.

Tested by compilation only.
Caught by cppcheck.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
2015-12-11 11:05:49 +01:00

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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/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 <linux/uaccess.h>
#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 MOS_WDR_TIMEOUT 5000 /* 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 */
/* The native mos7840/7820 component */
#define USB_VENDOR_ID_MOSCHIP 0x9710
#define MOSCHIP_DEVICE_ID_7840 0x7840
#define MOSCHIP_DEVICE_ID_7820 0x7820
#define MOSCHIP_DEVICE_ID_7810 0x7810
/* The native component can have its vendor/device id's overridden
* in vendor-specific implementations. Such devices can be handled
* by making a change here, in id_table.
*/
#define USB_VENDOR_ID_BANDB 0x0856
#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
/* This driver also supports
* ATEN UC2324 device using Moschip MCS7840
* ATEN UC2322 device using Moschip MCS7820
*/
#define USB_VENDOR_ID_ATENINTL 0x0557
#define ATENINTL_DEVICE_ID_UC2324 0x2011
#define ATENINTL_DEVICE_ID_UC2322 0x7820
/* Interrupt Routine 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 GPIO_REGISTER ((__u16)(0x07))
#define SERIAL_LCR_DLAB ((__u16)(0x0080))
/*
* URB POOL related defines
*/
#define NUM_URBS 16 /* URB Count */
#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
/* LED on/off milliseconds*/
#define LED_ON_MS 500
#define LED_OFF_MS 500
enum mos7840_flag {
MOS7840_FLAG_CTRL_BUSY,
MOS7840_FLAG_LED_BUSY,
};
static const struct usb_device_id id_table[] = {
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
{USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
{USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
{USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
{} /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, id_table);
/* 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;
char open_ports;
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;
struct usb_ctrlrequest *dr;
char *ctrl_buf;
int MsrLsr;
spinlock_t pool_lock;
struct urb *write_urb_pool[NUM_URBS];
char busy[NUM_URBS];
bool read_urb_busy;
/* For device(s) with LED indicator */
bool has_led;
struct timer_list led_timer1; /* Timer for LED on */
struct timer_list led_timer2; /* Timer for LED off */
struct urb *led_urb;
struct usb_ctrlrequest *led_dr;
unsigned long flags;
};
/*
* 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;
dev_dbg(&port->dev, "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;
u8 *buf;
buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
if (!buf)
return -ENOMEM;
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
MOS_WDR_TIMEOUT);
*val = buf[0];
dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
kfree(buf);
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 (port->serial->num_ports == 4) {
val |= ((__u16)port->port_number + 1) << 8;
} else {
if (port->port_number == 0) {
val |= ((__u16)port->port_number + 1) << 8;
} else {
val |= ((__u16)port->port_number + 2) << 8;
}
}
dev_dbg(&port->dev, "%s application number is %x\n", __func__, 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;
u8 *buf;
buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* Wval is same as application number */
if (port->serial->num_ports == 4) {
Wval = ((__u16)port->port_number + 1) << 8;
} else {
if (port->port_number == 0) {
Wval = ((__u16)port->port_number + 1) << 8;
} else {
Wval = ((__u16)port->port_number + 2) << 8;
}
}
dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
MOS_WDR_TIMEOUT);
*val = buf[0];
kfree(buf);
return ret;
}
static void mos7840_dump_serial_port(struct usb_serial_port *port,
struct moschip_port *mos7840_port)
{
dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
}
/************************************************************************/
/************************************************************************/
/* 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 void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
{
struct moschip_port *mos7840_port;
struct async_icount *icount;
mos7840_port = port;
if (new_msr &
(MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
MOS_MSR_DELTA_CD)) {
icount = &mos7840_port->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++;
wake_up_interruptible(&port->port->port.delta_msr_wait);
}
}
static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
{
struct async_icount *icount;
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->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++;
}
/************************************************************************/
/************************************************************************/
/* 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;
struct device *dev = &urb->dev->dev;
__u8 regval = 0x0;
int status = urb->status;
mos7840_port = urb->context;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
goto out;
default:
dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
goto out;
}
dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
mos7840_port->MsrLsr, mos7840_port->port_num);
data = urb->transfer_buffer;
regval = (__u8) data[0];
dev_dbg(dev, "%s data is %x\n", __func__, 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);
out:
clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
}
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 = mcs->dr;
unsigned char *buffer = mcs->ctrl_buf;
int ret;
if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
return -EBUSY;
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);
if (ret)
clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
return ret;
}
static void mos7840_set_led_callback(struct urb *urb)
{
switch (urb->status) {
case 0:
/* Success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* This urb is terminated, clean up */
dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
__func__, urb->status);
break;
default:
dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
__func__, urb->status);
}
}
static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
__u16 reg)
{
struct usb_device *dev = mcs->port->serial->dev;
struct usb_ctrlrequest *dr = mcs->led_dr;
dr->bRequestType = MCS_WR_RTYPE;
dr->bRequest = MCS_WRREQ;
dr->wValue = cpu_to_le16(wval);
dr->wIndex = cpu_to_le16(reg);
dr->wLength = cpu_to_le16(0);
usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
(unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
}
static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
__u16 val)
{
struct usb_device *dev = port->serial->dev;
usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
val, reg, NULL, 0, MOS_WDR_TIMEOUT);
}
static void mos7840_led_off(unsigned long arg)
{
struct moschip_port *mcs = (struct moschip_port *) arg;
/* Turn off LED */
mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
mod_timer(&mcs->led_timer2,
jiffies + msecs_to_jiffies(LED_OFF_MS));
}
static void mos7840_led_flag_off(unsigned long arg)
{
struct moschip_port *mcs = (struct moschip_port *) arg;
clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
}
static void mos7840_led_activity(struct usb_serial_port *port)
{
struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
return;
mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
mod_timer(&mos7840_port->led_timer1,
jiffies + msecs_to_jiffies(LED_ON_MS));
}
/*****************************************************************************
* 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, rv = 0;
__u16 wval, wreg = 0;
int status = urb->status;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
__func__, status);
return;
default:
dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
__func__, status);
goto exit;
}
length = urb->actual_length;
data = urb->transfer_buffer;
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 > 5) {
dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
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]->port_number + 1) << 8;
if (mos7840_port->open) {
if (sp[i] & 0x01) {
dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
} else {
switch (sp[i] & 0x0f) {
case SERIAL_IIR_RLS:
dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
mos7840_port->MsrLsr = 1;
wreg = LINE_STATUS_REGISTER;
break;
case SERIAL_IIR_MS:
dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
mos7840_port->MsrLsr = 0;
wreg = MODEM_STATUS_REGISTER;
break;
}
rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
}
}
}
if (!(rv < 0))
/* the completion handler for the control urb will resubmit */
return;
exit:
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dev_err(&urb->dev->dev,
"%s - Error %d submitting interrupt urb\n",
__func__, result);
}
}
static int mos7840_port_paranoia_check(struct usb_serial_port *port,
const char *function)
{
if (!port) {
pr_debug("%s - port == NULL\n", function);
return -1;
}
if (!port->serial) {
pr_debug("%s - port->serial == NULL\n", 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) {
pr_debug("%s - serial == NULL\n", function);
return -1;
}
if (!serial->type) {
pr_debug("%s - serial->type == NULL!\n", 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 retval;
unsigned char *data;
struct usb_serial *serial;
struct usb_serial_port *port;
struct moschip_port *mos7840_port;
int status = urb->status;
mos7840_port = urb->context;
if (!mos7840_port)
return;
if (status) {
dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
mos7840_port->read_urb_busy = false;
return;
}
port = mos7840_port->port;
if (mos7840_port_paranoia_check(port, __func__)) {
mos7840_port->read_urb_busy = false;
return;
}
serial = mos7840_get_usb_serial(port, __func__);
if (!serial) {
mos7840_port->read_urb_busy = false;
return;
}
data = urb->transfer_buffer;
usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
if (urb->actual_length) {
struct tty_port *tport = &mos7840_port->port->port;
tty_insert_flip_string(tport, data, urb->actual_length);
tty_flip_buffer_push(tport);
port->icount.rx += urb->actual_length;
dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
}
if (!mos7840_port->read_urb) {
dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
mos7840_port->read_urb_busy = false;
return;
}
if (mos7840_port->has_led)
mos7840_led_activity(port);
mos7840_port->read_urb_busy = true;
retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
if (retval) {
dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
mos7840_port->read_urb_busy = false;
}
}
/*****************************************************************************
* 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 usb_serial_port *port;
int status = urb->status;
int i;
mos7840_port = urb->context;
port = mos7840_port->port;
spin_lock(&mos7840_port->pool_lock);
for (i = 0; i < NUM_URBS; i++) {
if (urb == mos7840_port->write_urb_pool[i]) {
mos7840_port->busy[i] = 0;
break;
}
}
spin_unlock(&mos7840_port->pool_lock);
if (status) {
dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
return;
}
if (mos7840_port_paranoia_check(port, __func__))
return;
if (mos7840_port->open)
tty_port_tty_wakeup(&port->port);
}
/************************************************************************/
/* 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 */
/************************************************************************/
/*****************************************************************************
* 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 tty_struct *tty, struct usb_serial_port *port)
{
int response;
int j;
struct usb_serial *serial;
struct urb *urb;
__u16 Data;
int status;
struct moschip_port *mos7840_port;
struct moschip_port *port0;
if (mos7840_port_paranoia_check(port, __func__))
return -ENODEV;
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __func__))
return -ENODEV;
mos7840_port = mos7840_get_port_private(port);
port0 = mos7840_get_port_private(serial->port[0]);
if (mos7840_port == NULL || port0 == NULL)
return -ENODEV;
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
port0->open_ports++;
/* Initialising the write urb pool */
for (j = 0; j < NUM_URBS; ++j) {
urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->write_urb_pool[j] = urb;
if (!urb)
continue;
urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
GFP_KERNEL);
if (!urb->transfer_buffer) {
usb_free_urb(urb);
mos7840_port->write_urb_pool[j] = NULL;
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 */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
if (status < 0) {
dev_dbg(&port->dev, "Reading Spreg failed\n");
goto err;
}
Data |= 0x80;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
if (status < 0) {
dev_dbg(&port->dev, "writing Spreg failed\n");
goto err;
}
Data &= ~0x80;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
if (status < 0) {
dev_dbg(&port->dev, "writing Spreg failed\n");
goto err;
}
/* End of block to be checked */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
&Data);
if (status < 0) {
dev_dbg(&port->dev, "Reading Controlreg failed\n");
goto err;
}
Data |= 0x08; /* Driver done bit */
Data |= 0x20; /* rx_disable */
status = mos7840_set_reg_sync(port,
mos7840_port->ControlRegOffset, Data);
if (status < 0) {
dev_dbg(&port->dev, "writing Controlreg failed\n");
goto err;
}
/* do register settings here */
/* Set all regs to the device default values. */
/***********************************
* First Disable all interrupts.
***********************************/
Data = 0x00;
status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
if (status < 0) {
dev_dbg(&port->dev, "disabling interrupts failed\n");
goto err;
}
/* Set FIFO_CONTROL_REGISTER to the default value */
Data = 0x00;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
goto err;
}
Data = 0xcf;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
goto err;
}
Data = 0x03;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
mos7840_port->shadowLCR = Data;
Data = 0x0b;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
mos7840_port->shadowMCR = Data;
Data = 0x00;
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 = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
Data = 0x0c;
status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
Data = 0x0;
status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
Data = 0x00;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
Data = Data & ~SERIAL_LCR_DLAB;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
mos7840_port->shadowLCR = Data;
/* clearing Bulkin and Bulkout Fifo */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
Data = Data | 0x0c;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
Data = Data & ~0x0c;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
/* Finally enable all interrupts */
Data = 0x0c;
status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
/* clearing rx_disable */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
&Data);
Data = Data & ~0x20;
status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
Data);
/* rx_negate */
Data = 0x0;
status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
&Data);
Data = Data | 0x10;
status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
Data);
/* 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 (port0->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) {
dev_err(&port->dev, "%s - Error %d submitting "
"interrupt urb\n", __func__, 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.) */
dev_dbg(&port->dev, "port number is %d\n", port->port_number);
dev_dbg(&port->dev, "minor number is %d\n", port->minor);
dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
dev_dbg(&port->dev, "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 */
if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
usb_fill_bulk_urb(mos7840_port->read_urb,
serial->dev,
usb_rcvbulkpipe(serial->dev,
(port->bulk_in_endpointAddress) + 2),
port->bulk_in_buffer,
mos7840_port->read_urb->transfer_buffer_length,
mos7840_bulk_in_callback, mos7840_port);
} else {
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);
}
dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
mos7840_port->read_urb_busy = true;
response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
if (response) {
dev_err(&port->dev, "%s - Error %d submitting control urb\n",
__func__, response);
mos7840_port->read_urb_busy = false;
}
/* initialize our port settings */
/* Must set to enable ints! */
mos7840_port->shadowMCR = MCR_MASTER_IE;
/* send a open port command */
mos7840_port->open = 1;
/* mos7840_change_port_settings(mos7840_port,old_termios); */
return 0;
err:
for (j = 0; j < NUM_URBS; ++j) {
urb = mos7840_port->write_urb_pool[j];
if (!urb)
continue;
kfree(urb->transfer_buffer);
usb_free_urb(urb);
}
return status;
}
/*****************************************************************************
* 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 zero.
*****************************************************************************/
static int mos7840_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int i;
int chars = 0;
unsigned long flags;
struct moschip_port *mos7840_port;
if (mos7840_port_paranoia_check(port, __func__))
return 0;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return 0;
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (mos7840_port->busy[i]) {
struct urb *urb = mos7840_port->write_urb_pool[i];
chars += urb->transfer_buffer_length;
}
}
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
return chars;
}
/*****************************************************************************
* 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 usb_serial *serial;
struct moschip_port *mos7840_port;
struct moschip_port *port0;
int j;
__u16 Data;
if (mos7840_port_paranoia_check(port, __func__))
return;
serial = mos7840_get_usb_serial(port, __func__);
if (!serial)
return;
mos7840_port = mos7840_get_port_private(port);
port0 = mos7840_get_port_private(serial->port[0]);
if (mos7840_port == NULL || port0 == 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]) {
kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
usb_free_urb(mos7840_port->write_urb_pool[j]);
}
}
usb_kill_urb(mos7840_port->write_urb);
usb_kill_urb(mos7840_port->read_urb);
mos7840_port->read_urb_busy = false;
port0->open_ports--;
dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
if (port0->open_ports == 0) {
if (serial->port[0]->interrupt_in_urb) {
dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
usb_kill_urb(serial->port[0]->interrupt_in_urb);
}
}
if (mos7840_port->write_urb) {
/* if this urb had a transfer buffer already (old tx) free it */
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;
}
/*****************************************************************************
* mos7840_break
* this function sends a break to the port
*****************************************************************************/
static void mos7840_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned char data;
struct usb_serial *serial;
struct moschip_port *mos7840_port;
if (mos7840_port_paranoia_check(port, __func__))
return;
serial = mos7840_get_usb_serial(port, __func__);
if (!serial)
return;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
if (break_state == -1)
data = mos7840_port->shadowLCR | LCR_SET_BREAK;
else
data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
/* FIXME: no locking on shadowLCR anywhere in driver */
mos7840_port->shadowLCR = data;
dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
mos7840_port->shadowLCR);
}
/*****************************************************************************
* 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 tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int i;
int room = 0;
unsigned long flags;
struct moschip_port *mos7840_port;
if (mos7840_port_paranoia_check(port, __func__))
return -1;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -1;
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (!mos7840_port->busy[i])
room += URB_TRANSFER_BUFFER_SIZE;
}
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, 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 tty_struct *tty, struct usb_serial_port *port,
const unsigned char *data, int count)
{
int status;
int i;
int bytes_sent = 0;
int transfer_size;
unsigned long flags;
struct moschip_port *mos7840_port;
struct usb_serial *serial;
struct urb *urb;
/* __u16 Data; */
const unsigned char *current_position = data;
unsigned char *data1;
if (mos7840_port_paranoia_check(port, __func__))
return -1;
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __func__))
return -1;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -1;
/* try to find a free urb in the list */
urb = NULL;
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (!mos7840_port->busy[i]) {
mos7840_port->busy[i] = 1;
urb = mos7840_port->write_urb_pool[i];
dev_dbg(&port->dev, "URB:%d\n", i);
break;
}
}
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
if (urb == NULL) {
dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
goto exit;
}
if (urb->transfer_buffer == NULL) {
urb->transfer_buffer =
kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
if (!urb->transfer_buffer)
goto exit;
}
transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
memcpy(urb->transfer_buffer, current_position, transfer_size);
/* fill urb with data and submit */
if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
usb_fill_bulk_urb(urb,
serial->dev,
usb_sndbulkpipe(serial->dev,
(port->bulk_out_endpointAddress) + 2),
urb->transfer_buffer,
transfer_size,
mos7840_bulk_out_data_callback, mos7840_port);
} else {
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;
dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
if (mos7840_port->has_led)
mos7840_led_activity(port);
/* send it down the pipe */
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
mos7840_port->busy[i] = 0;
dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
"with status = %d\n", __func__, status);
bytes_sent = status;
goto exit;
}
bytes_sent = transfer_size;
port->icount.tx += transfer_size;
dev_dbg(&port->dev, "icount.tx is %d:\n", 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 tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port;
int status;
if (mos7840_port_paranoia_check(port, __func__))
return;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dev_dbg(&port->dev, "%s", "port not opened\n");
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(tty, 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 = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
mos7840_port->shadowMCR);
if (status < 0)
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 mos7840_throttle is
* called)
*****************************************************************************/
static void mos7840_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int status;
struct moschip_port *mos7840_port = mos7840_get_port_private(port);
if (mos7840_port_paranoia_check(port, __func__))
return;
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dev_dbg(&port->dev, "%s - port not opened\n", __func__);
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(tty, 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 = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
mos7840_port->shadowMCR);
if (status < 0)
return;
}
}
static int mos7840_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port;
unsigned int result;
__u16 msr;
__u16 mcr;
int status;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -ENODEV;
status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
if (status != 1)
return -EIO;
status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
if (status != 1)
return -EIO;
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);
dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
return result;
}
static int mos7840_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port;
unsigned int mcr;
int status;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -ENODEV;
/* FIXME: What locks the port registers ? */
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 = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
if (status < 0) {
dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
return status;
}
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(struct usb_serial_port *port,
int baudRate, int *divisor,
__u16 *clk_sel_val)
{
dev_dbg(&port->dev, "%s - %d\n", __func__, 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;
}
/*****************************************************************************
* 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 = mos7840_port->port;
if (mos7840_port_paranoia_check(port, __func__))
return -1;
if (mos7840_serial_paranoia_check(port->serial, __func__))
return -1;
number = mos7840_port->port->port_number;
dev_dbg(&port->dev, "%s - baud = %d\n", __func__, 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 */
Data = 0x2b;
mos7840_port->shadowMCR = Data;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
return -1;
}
#endif
} else {
#ifdef HW_flow_control
/* setting h/w flow control bit to 0 */
Data = 0xb;
mos7840_port->shadowMCR = Data;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
return -1;
}
#endif
}
if (1) { /* baudRate <= 115200) */
clk_sel_val = 0x0;
Data = 0x0;
status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
&clk_sel_val);
status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
&Data);
if (status < 0) {
dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
return -1;
}
Data = (Data & 0x8f) | clk_sel_val;
status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
return -1;
}
/* Calculate the Divisor */
if (status) {
dev_err(&port->dev, "%s - bad baud rate\n", __func__);
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);
dev_dbg(&port->dev, "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);
dev_dbg(&port->dev, "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 tty_struct *tty,
struct moschip_port *mos7840_port, struct ktermios *old_termios)
{
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 = mos7840_port->port;
if (mos7840_port_paranoia_check(port, __func__))
return;
if (mos7840_serial_paranoia_check(port->serial, __func__))
return;
serial = port->serial;
if (!mos7840_port->open) {
dev_dbg(&port->dev, "%s - port not opened\n", __func__);
return;
}
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 */
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;
dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
} else {
lParity = LCR_PAR_EVEN;
dev_dbg(&port->dev, "%s - parity = even\n", __func__);
}
} else {
dev_dbg(&port->dev, "%s - parity = none\n", __func__);
}
if (cflag & CMSPAR)
lParity = lParity | 0x20;
/* Change the Stop bit */
if (cflag & CSTOPB) {
lStop = LCR_STOP_2;
dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
} else {
lStop = LCR_STOP_1;
dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
}
/* 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);
dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
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... */
dev_dbg(&port->dev, "%s", "Picked default baud...\n");
baud = 9600;
}
dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, 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_busy == false) {
mos7840_port->read_urb_busy = true;
status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
if (status) {
dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
status);
mos7840_port->read_urb_busy = false;
}
}
dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
mos7840_port->shadowLCR);
}
/*****************************************************************************
* 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 tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
int status;
unsigned int cflag;
struct usb_serial *serial;
struct moschip_port *mos7840_port;
if (mos7840_port_paranoia_check(port, __func__))
return;
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __func__))
return;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return;
if (!mos7840_port->open) {
dev_dbg(&port->dev, "%s - port not opened\n", __func__);
return;
}
dev_dbg(&port->dev, "%s", "setting termios - \n");
cflag = tty->termios.c_cflag;
dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
/* change the port settings to the new ones specified */
mos7840_change_port_settings(tty, mos7840_port, old_termios);
if (!mos7840_port->read_urb) {
dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
return;
}
if (mos7840_port->read_urb_busy == false) {
mos7840_port->read_urb_busy = true;
status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
if (status) {
dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
status);
mos7840_port->read_urb_busy = false;
}
}
}
/*****************************************************************************
* 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 tty_struct *tty,
unsigned int __user *value)
{
int count;
unsigned int result = 0;
count = mos7840_chars_in_buffer(tty);
if (count == 0)
result = TIOCSER_TEMT;
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->minor;
tmp.port = mos7840_port->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 tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
void __user *argp = (void __user *)arg;
struct moschip_port *mos7840_port;
if (mos7840_port_paranoia_check(port, __func__))
return -1;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port == NULL)
return -1;
switch (cmd) {
/* return number of bytes available */
case TIOCSERGETLSR:
dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
return mos7840_get_lsr_info(tty, argp);
case TIOCGSERIAL:
dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
return mos7840_get_serial_info(mos7840_port, argp);
case TIOCSSERIAL:
dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
break;
default:
break;
}
return -ENOIOCTLCMD;
}
static int mos7810_check(struct usb_serial *serial)
{
int i, pass_count = 0;
u8 *buf;
__u16 data = 0, mcr_data = 0;
__u16 test_pattern = 0x55AA;
int res;
buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
if (!buf)
return 0; /* failed to identify 7810 */
/* Store MCR setting */
res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
if (res == VENDOR_READ_LENGTH)
mcr_data = *buf;
for (i = 0; i < 16; i++) {
/* Send the 1-bit test pattern out to MCS7810 test pin */
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
MCS_WRREQ, MCS_WR_RTYPE,
(0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
/* Read the test pattern back */
res = usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
if (res == VENDOR_READ_LENGTH)
data = *buf;
/* If this is a MCS7810 device, both test patterns must match */
if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
break;
pass_count++;
}
/* Restore MCR setting */
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
0, MOS_WDR_TIMEOUT);
kfree(buf);
if (pass_count == 16)
return 1;
return 0;
}
static int mos7840_probe(struct usb_serial *serial,
const struct usb_device_id *id)
{
u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
u8 *buf;
int device_type;
if (product == MOSCHIP_DEVICE_ID_7810 ||
product == MOSCHIP_DEVICE_ID_7820) {
device_type = product;
goto out;
}
buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
if (!buf)
return -ENOMEM;
usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
/* For a MCS7840 device GPIO0 must be set to 1 */
if (buf[0] & 0x01)
device_type = MOSCHIP_DEVICE_ID_7840;
else if (mos7810_check(serial))
device_type = MOSCHIP_DEVICE_ID_7810;
else
device_type = MOSCHIP_DEVICE_ID_7820;
kfree(buf);
out:
usb_set_serial_data(serial, (void *)(unsigned long)device_type);
return 0;
}
static int mos7840_calc_num_ports(struct usb_serial *serial)
{
int device_type = (unsigned long)usb_get_serial_data(serial);
int mos7840_num_ports;
mos7840_num_ports = (device_type >> 4) & 0x000F;
return mos7840_num_ports;
}
static int mos7840_port_probe(struct usb_serial_port *port)
{
struct usb_serial *serial = port->serial;
int device_type = (unsigned long)usb_get_serial_data(serial);
struct moschip_port *mos7840_port;
int status;
int pnum;
__u16 Data;
/* we set up the pointers to the endpoints in the mos7840_open *
* function, as the structures aren't created yet. */
pnum = port->port_number;
dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
if (!mos7840_port)
return -ENOMEM;
/* Initialize all port interrupt end point to port 0 int
* endpoint. Our device has only one interrupt end point
* common to all port */
mos7840_port->port = port;
mos7840_set_port_private(port, mos7840_port);
spin_lock_init(&mos7840_port->pool_lock);
/* minor is not initialised until later by
* usb-serial.c:get_free_serial() and cannot therefore be used
* to index device instances */
mos7840_port->port_num = pnum + 1;
dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
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) && (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0x8;
mos7840_port->ControlRegOffset = 0x9;
mos7840_port->DcrRegOffset = 0x16;
} else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0xc;
mos7840_port->ControlRegOffset = 0xd;
mos7840_port->DcrRegOffset = 0x1c;
}
mos7840_dump_serial_port(port, mos7840_port);
mos7840_set_port_private(port, mos7840_port);
/* enable rx_disable bit in control register */
status = mos7840_get_reg_sync(port,
mos7840_port->ControlRegOffset, &Data);
if (status < 0) {
dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
goto out;
} else
dev_dbg(&port->dev, "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 = mos7840_set_reg_sync(port,
mos7840_port->ControlRegOffset, Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
goto out;
} else
dev_dbg(&port->dev, "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 = mos7840_set_reg_sync(port,
(__u16) (mos7840_port->DcrRegOffset + 0), Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
goto out;
} else
dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
Data = 0x05;
status = mos7840_set_reg_sync(port,
(__u16) (mos7840_port->DcrRegOffset + 1), Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
goto out;
} else
dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
Data = 0x24;
status = mos7840_set_reg_sync(port,
(__u16) (mos7840_port->DcrRegOffset + 2), Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
goto out;
} else
dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
/* write values in clkstart0x0 and clkmulti 0x20 */
Data = 0x0;
status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
goto out;
} else
dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
Data = 0x20;
status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
goto error;
} else
dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
/* write value 0x0 to scratchpad register */
Data = 0x00;
status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
goto out;
} else
dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
/* Zero Length flag register */
if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
Data = 0xff;
status = mos7840_set_reg_sync(port,
(__u16) (ZLP_REG1 +
((__u16)mos7840_port->port_num)), Data);
dev_dbg(&port->dev, "ZLIP offset %x\n",
(__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
if (status < 0) {
dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
goto out;
} else
dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
} else {
Data = 0xff;
status = mos7840_set_reg_sync(port,
(__u16) (ZLP_REG1 +
((__u16)mos7840_port->port_num) - 0x1), Data);
dev_dbg(&port->dev, "ZLIP offset %x\n",
(__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
if (status < 0) {
dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
goto out;
} else
dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
}
mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
GFP_KERNEL);
if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
!mos7840_port->dr) {
status = -ENOMEM;
goto error;
}
mos7840_port->has_led = false;
/* Initialize LED timers */
if (device_type == MOSCHIP_DEVICE_ID_7810) {
mos7840_port->has_led = true;
mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
GFP_KERNEL);
if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
status = -ENOMEM;
goto error;
}
setup_timer(&mos7840_port->led_timer1, mos7840_led_off,
(unsigned long)mos7840_port);
mos7840_port->led_timer1.expires =
jiffies + msecs_to_jiffies(LED_ON_MS);
setup_timer(&mos7840_port->led_timer2, mos7840_led_flag_off,
(unsigned long)mos7840_port);
mos7840_port->led_timer2.expires =
jiffies + msecs_to_jiffies(LED_OFF_MS);
/* Turn off LED */
mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
}
out:
if (pnum == serial->num_ports - 1) {
/* Zero Length flag enable */
Data = 0x0f;
status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
if (status < 0) {
dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
goto error;
} else
dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
/* setting configuration feature to one */
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
0x03, 0x00, 0x01, 0x00, NULL, 0x00,
MOS_WDR_TIMEOUT);
}
return 0;
error:
kfree(mos7840_port->led_dr);
usb_free_urb(mos7840_port->led_urb);
kfree(mos7840_port->dr);
kfree(mos7840_port->ctrl_buf);
usb_free_urb(mos7840_port->control_urb);
kfree(mos7840_port);
return status;
}
static int mos7840_port_remove(struct usb_serial_port *port)
{
struct moschip_port *mos7840_port;
mos7840_port = mos7840_get_port_private(port);
if (mos7840_port->has_led) {
/* Turn off LED */
mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
del_timer_sync(&mos7840_port->led_timer1);
del_timer_sync(&mos7840_port->led_timer2);
usb_kill_urb(mos7840_port->led_urb);
usb_free_urb(mos7840_port->led_urb);
kfree(mos7840_port->led_dr);
}
usb_kill_urb(mos7840_port->control_urb);
usb_free_urb(mos7840_port->control_urb);
kfree(mos7840_port->ctrl_buf);
kfree(mos7840_port->dr);
kfree(mos7840_port);
return 0;
}
static struct usb_serial_driver moschip7840_4port_device = {
.driver = {
.owner = THIS_MODULE,
.name = "mos7840",
},
.description = DRIVER_DESC,
.id_table = id_table,
.num_ports = 4,
.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,
.probe = mos7840_probe,
.ioctl = mos7840_ioctl,
.set_termios = mos7840_set_termios,
.break_ctl = mos7840_break,
.tiocmget = mos7840_tiocmget,
.tiocmset = mos7840_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = usb_serial_generic_get_icount,
.port_probe = mos7840_port_probe,
.port_remove = mos7840_port_remove,
.read_bulk_callback = mos7840_bulk_in_callback,
.read_int_callback = mos7840_interrupt_callback,
};
static struct usb_serial_driver * const serial_drivers[] = {
&moschip7840_4port_device, NULL
};
module_usb_serial_driver(serial_drivers, id_table);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
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