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linux/drivers/usb/serial/mos7720.c
Johan Hovold 5833041f1b USB: serial: remove unnecessary reinitialisations of urb->dev 
Remove unnecessary reinitialisations of urb->dev before each submission,
which were based on the (no longer valid) assumption that serial->dev
will be set to NULL on close.

Compile-only tested.

Cc: Matthias Bruestle and Harald Welte <support@reiner-sct.com>
Cc: Lonnie Mendez <dignome@gmail.com>
Cc: Peter Berger <pberger@brimson.com>
Cc: Al Borchers <alborchers@steinerpoint.com>
Cc: Support Department <support@connecttech.com>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-11-15 10:33:16 -08:00

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/*
* mos7720.c
* Controls the Moschip 7720 usb to dual port serial convertor
*
* Copyright 2006 Moschip Semiconductor Tech. Ltd.
*
* 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, version 2 of the License.
*
* Developed by:
* Vijaya Kumar <vijaykumar.gn@gmail.com>
* Ajay Kumar <naanuajay@yahoo.com>
* Gurudeva <ngurudeva@yahoo.com>
*
* Cleaned up from the original by:
* Greg Kroah-Hartman <gregkh@suse.de>
*
* 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/spinlock.h>
#include <linux/serial.h>
#include <linux/serial_reg.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>
#include <linux/parport.h>
/*
* Version Information
*/
#define DRIVER_VERSION "2.1"
#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
#define DRIVER_DESC "Moschip USB Serial Driver"
/* default urb timeout */
#define MOS_WDR_TIMEOUT (HZ * 5)
#define MOS_MAX_PORT 0x02
#define MOS_WRITE 0x0E
#define MOS_READ 0x0D
/* Interrupt Rotinue Defines */
#define SERIAL_IIR_RLS 0x06
#define SERIAL_IIR_RDA 0x04
#define SERIAL_IIR_CTI 0x0c
#define SERIAL_IIR_THR 0x02
#define SERIAL_IIR_MS 0x00
#define NUM_URBS 16 /* URB Count */
#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
/* This structure holds all of the local serial port information */
struct moschip_port {
__u8 shadowLCR; /* last LCR value received */
__u8 shadowMCR; /* last MCR value received */
__u8 shadowMSR; /* last MSR value received */
char open;
struct async_icount icount;
struct usb_serial_port *port; /* loop back to the owner */
struct urb *write_urb_pool[NUM_URBS];
};
static int debug;
static struct usb_serial_driver moschip7720_2port_driver;
#define USB_VENDOR_ID_MOSCHIP 0x9710
#define MOSCHIP_DEVICE_ID_7720 0x7720
#define MOSCHIP_DEVICE_ID_7715 0x7715
static const struct usb_device_id moschip_port_id_table[] = {
{ USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) },
{ USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) },
{ } /* terminating entry */
};
MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
/* initial values for parport regs */
#define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */
#define ECR_INIT_VAL 0x00 /* SPP mode */
struct urbtracker {
struct mos7715_parport *mos_parport;
struct list_head urblist_entry;
struct kref ref_count;
struct urb *urb;
};
enum mos7715_pp_modes {
SPP = 0<<5,
PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */
PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */
};
struct mos7715_parport {
struct parport *pp; /* back to containing struct */
struct kref ref_count; /* to instance of this struct */
struct list_head deferred_urbs; /* list deferred async urbs */
struct list_head active_urbs; /* list async urbs in flight */
spinlock_t listlock; /* protects list access */
bool msg_pending; /* usb sync call pending */
struct completion syncmsg_compl; /* usb sync call completed */
struct tasklet_struct urb_tasklet; /* for sending deferred urbs */
struct usb_serial *serial; /* back to containing struct */
__u8 shadowECR; /* parallel port regs... */
__u8 shadowDCR;
atomic_t shadowDSR; /* updated in int-in callback */
};
/* lock guards against dereferencing NULL ptr in parport ops callbacks */
static DEFINE_SPINLOCK(release_lock);
#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
static const unsigned int dummy; /* for clarity in register access fns */
enum mos_regs {
THR, /* serial port regs */
RHR,
IER,
FCR,
ISR,
LCR,
MCR,
LSR,
MSR,
SPR,
DLL,
DLM,
DPR, /* parallel port regs */
DSR,
DCR,
ECR,
SP1_REG, /* device control regs */
SP2_REG, /* serial port 2 (7720 only) */
PP_REG,
SP_CONTROL_REG,
};
/*
* Return the correct value for the Windex field of the setup packet
* for a control endpoint message. See the 7715 datasheet.
*/
static inline __u16 get_reg_index(enum mos_regs reg)
{
static const __u16 mos7715_index_lookup_table[] = {
0x00, /* THR */
0x00, /* RHR */
0x01, /* IER */
0x02, /* FCR */
0x02, /* ISR */
0x03, /* LCR */
0x04, /* MCR */
0x05, /* LSR */
0x06, /* MSR */
0x07, /* SPR */
0x00, /* DLL */
0x01, /* DLM */
0x00, /* DPR */
0x01, /* DSR */
0x02, /* DCR */
0x0a, /* ECR */
0x01, /* SP1_REG */
0x02, /* SP2_REG (7720 only) */
0x04, /* PP_REG (7715 only) */
0x08, /* SP_CONTROL_REG */
};
return mos7715_index_lookup_table[reg];
}
/*
* Return the correct value for the upper byte of the Wvalue field of
* the setup packet for a control endpoint message.
*/
static inline __u16 get_reg_value(enum mos_regs reg,
unsigned int serial_portnum)
{
if (reg >= SP1_REG) /* control reg */
return 0x0000;
else if (reg >= DPR) /* parallel port reg (7715 only) */
return 0x0100;
else /* serial port reg */
return (serial_portnum + 2) << 8;
}
/*
* Write data byte to the specified device register. The data is embedded in
* the value field of the setup packet. serial_portnum is ignored for registers
* not specific to a particular serial port.
*/
static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
enum mos_regs reg, __u8 data)
{
struct usb_device *usbdev = serial->dev;
unsigned int pipe = usb_sndctrlpipe(usbdev, 0);
__u8 request = (__u8)0x0e;
__u8 requesttype = (__u8)0x40;
__u16 index = get_reg_index(reg);
__u16 value = get_reg_value(reg, serial_portnum) + data;
int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
index, NULL, 0, MOS_WDR_TIMEOUT);
if (status < 0)
dev_err(&usbdev->dev,
"mos7720: usb_control_msg() failed: %d", status);
return status;
}
/*
* Read data byte from the specified device register. The data returned by the
* device is embedded in the value field of the setup packet. serial_portnum is
* ignored for registers that are not specific to a particular serial port.
*/
static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum,
enum mos_regs reg, __u8 *data)
{
struct usb_device *usbdev = serial->dev;
unsigned int pipe = usb_rcvctrlpipe(usbdev, 0);
__u8 request = (__u8)0x0d;
__u8 requesttype = (__u8)0xc0;
__u16 index = get_reg_index(reg);
__u16 value = get_reg_value(reg, serial_portnum);
int status = usb_control_msg(usbdev, pipe, request, requesttype, value,
index, data, 1, MOS_WDR_TIMEOUT);
if (status < 0)
dev_err(&usbdev->dev,
"mos7720: usb_control_msg() failed: %d", status);
return status;
}
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
static inline int mos7715_change_mode(struct mos7715_parport *mos_parport,
enum mos7715_pp_modes mode)
{
mos_parport->shadowECR = mode;
write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
return 0;
}
static void destroy_mos_parport(struct kref *kref)
{
struct mos7715_parport *mos_parport =
container_of(kref, struct mos7715_parport, ref_count);
dbg("%s called", __func__);
kfree(mos_parport);
}
static void destroy_urbtracker(struct kref *kref)
{
struct urbtracker *urbtrack =
container_of(kref, struct urbtracker, ref_count);
struct mos7715_parport *mos_parport = urbtrack->mos_parport;
dbg("%s called", __func__);
usb_free_urb(urbtrack->urb);
kfree(urbtrack);
kref_put(&mos_parport->ref_count, destroy_mos_parport);
}
/*
* This runs as a tasklet when sending an urb in a non-blocking parallel
* port callback had to be deferred because the disconnect mutex could not be
* obtained at the time.
*/
static void send_deferred_urbs(unsigned long _mos_parport)
{
int ret_val;
unsigned long flags;
struct mos7715_parport *mos_parport = (void *)_mos_parport;
struct urbtracker *urbtrack;
struct list_head *cursor, *next;
dbg("%s called", __func__);
/* if release function ran, game over */
if (unlikely(mos_parport->serial == NULL))
return;
/* try again to get the mutex */
if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
dbg("%s: rescheduling tasklet", __func__);
tasklet_schedule(&mos_parport->urb_tasklet);
return;
}
/* if device disconnected, game over */
if (unlikely(mos_parport->serial->disconnected)) {
mutex_unlock(&mos_parport->serial->disc_mutex);
return;
}
spin_lock_irqsave(&mos_parport->listlock, flags);
if (list_empty(&mos_parport->deferred_urbs)) {
spin_unlock_irqrestore(&mos_parport->listlock, flags);
mutex_unlock(&mos_parport->serial->disc_mutex);
dbg("%s: deferred_urbs list empty", __func__);
return;
}
/* move contents of deferred_urbs list to active_urbs list and submit */
list_for_each_safe(cursor, next, &mos_parport->deferred_urbs)
list_move_tail(cursor, &mos_parport->active_urbs);
list_for_each_entry(urbtrack, &mos_parport->active_urbs,
urblist_entry) {
ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
dbg("%s: urb submitted", __func__);
if (ret_val) {
dev_err(&mos_parport->serial->dev->dev,
"usb_submit_urb() failed: %d", ret_val);
list_del(&urbtrack->urblist_entry);
kref_put(&urbtrack->ref_count, destroy_urbtracker);
}
}
spin_unlock_irqrestore(&mos_parport->listlock, flags);
mutex_unlock(&mos_parport->serial->disc_mutex);
}
/* callback for parallel port control urbs submitted asynchronously */
static void async_complete(struct urb *urb)
{
struct urbtracker *urbtrack = urb->context;
int status = urb->status;
dbg("%s called", __func__);
if (unlikely(status))
dbg("%s - nonzero urb status received: %d", __func__, status);
/* remove the urbtracker from the active_urbs list */
spin_lock(&urbtrack->mos_parport->listlock);
list_del(&urbtrack->urblist_entry);
spin_unlock(&urbtrack->mos_parport->listlock);
kref_put(&urbtrack->ref_count, destroy_urbtracker);
}
static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
enum mos_regs reg, __u8 data)
{
struct urbtracker *urbtrack;
int ret_val;
unsigned long flags;
struct usb_ctrlrequest setup;
struct usb_serial *serial = mos_parport->serial;
struct usb_device *usbdev = serial->dev;
dbg("%s called", __func__);
/* create and initialize the control urb and containing urbtracker */
urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
if (urbtrack == NULL) {
dev_err(&usbdev->dev, "out of memory");
return -ENOMEM;
}
kref_get(&mos_parport->ref_count);
urbtrack->mos_parport = mos_parport;
urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
if (urbtrack->urb == NULL) {
dev_err(&usbdev->dev, "out of urbs");
kfree(urbtrack);
return -ENOMEM;
}
setup.bRequestType = (__u8)0x40;
setup.bRequest = (__u8)0x0e;
setup.wValue = get_reg_value(reg, dummy);
setup.wIndex = get_reg_index(reg);
setup.wLength = 0;
usb_fill_control_urb(urbtrack->urb, usbdev,
usb_sndctrlpipe(usbdev, 0),
(unsigned char *)&setup,
NULL, 0, async_complete, urbtrack);
kref_init(&urbtrack->ref_count);
INIT_LIST_HEAD(&urbtrack->urblist_entry);
/*
* get the disconnect mutex, or add tracker to the deferred_urbs list
* and schedule a tasklet to try again later
*/
if (!mutex_trylock(&serial->disc_mutex)) {
spin_lock_irqsave(&mos_parport->listlock, flags);
list_add_tail(&urbtrack->urblist_entry,
&mos_parport->deferred_urbs);
spin_unlock_irqrestore(&mos_parport->listlock, flags);
tasklet_schedule(&mos_parport->urb_tasklet);
dbg("tasklet scheduled");
return 0;
}
/* bail if device disconnected */
if (serial->disconnected) {
kref_put(&urbtrack->ref_count, destroy_urbtracker);
mutex_unlock(&serial->disc_mutex);
return -ENODEV;
}
/* add the tracker to the active_urbs list and submit */
spin_lock_irqsave(&mos_parport->listlock, flags);
list_add_tail(&urbtrack->urblist_entry, &mos_parport->active_urbs);
spin_unlock_irqrestore(&mos_parport->listlock, flags);
ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
mutex_unlock(&serial->disc_mutex);
if (ret_val) {
dev_err(&usbdev->dev,
"%s: submit_urb() failed: %d", __func__, ret_val);
spin_lock_irqsave(&mos_parport->listlock, flags);
list_del(&urbtrack->urblist_entry);
spin_unlock_irqrestore(&mos_parport->listlock, flags);
kref_put(&urbtrack->ref_count, destroy_urbtracker);
return ret_val;
}
return 0;
}
/*
* This is the the common top part of all parallel port callback operations that
* send synchronous messages to the device. This implements convoluted locking
* that avoids two scenarios: (1) a port operation is called after usbserial
* has called our release function, at which point struct mos7715_parport has
* been destroyed, and (2) the device has been disconnected, but usbserial has
* not called the release function yet because someone has a serial port open.
* The shared release_lock prevents the first, and the mutex and disconnected
* flag maintained by usbserial covers the second. We also use the msg_pending
* flag to ensure that all synchronous usb messgage calls have completed before
* our release function can return.
*/
static int parport_prologue(struct parport *pp)
{
struct mos7715_parport *mos_parport;
spin_lock(&release_lock);
mos_parport = pp->private_data;
if (unlikely(mos_parport == NULL)) {
/* release fn called, port struct destroyed */
spin_unlock(&release_lock);
return -1;
}
mos_parport->msg_pending = true; /* synch usb call pending */
INIT_COMPLETION(mos_parport->syncmsg_compl);
spin_unlock(&release_lock);
mutex_lock(&mos_parport->serial->disc_mutex);
if (mos_parport->serial->disconnected) {
/* device disconnected */
mutex_unlock(&mos_parport->serial->disc_mutex);
mos_parport->msg_pending = false;
complete(&mos_parport->syncmsg_compl);
return -1;
}
return 0;
}
/*
* This is the the common bottom part of all parallel port functions that send
* synchronous messages to the device.
*/
static inline void parport_epilogue(struct parport *pp)
{
struct mos7715_parport *mos_parport = pp->private_data;
mutex_unlock(&mos_parport->serial->disc_mutex);
mos_parport->msg_pending = false;
complete(&mos_parport->syncmsg_compl);
}
static void parport_mos7715_write_data(struct parport *pp, unsigned char d)
{
struct mos7715_parport *mos_parport = pp->private_data;
dbg("%s called: %2.2x", __func__, d);
if (parport_prologue(pp) < 0)
return;
mos7715_change_mode(mos_parport, SPP);
write_mos_reg(mos_parport->serial, dummy, DPR, (__u8)d);
parport_epilogue(pp);
}
static unsigned char parport_mos7715_read_data(struct parport *pp)
{
struct mos7715_parport *mos_parport = pp->private_data;
unsigned char d;
dbg("%s called", __func__);
if (parport_prologue(pp) < 0)
return 0;
read_mos_reg(mos_parport->serial, dummy, DPR, &d);
parport_epilogue(pp);
return d;
}
static void parport_mos7715_write_control(struct parport *pp, unsigned char d)
{
struct mos7715_parport *mos_parport = pp->private_data;
__u8 data;
dbg("%s called: %2.2x", __func__, d);
if (parport_prologue(pp) < 0)
return;
data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
write_mos_reg(mos_parport->serial, dummy, DCR, data);
mos_parport->shadowDCR = data;
parport_epilogue(pp);
}
static unsigned char parport_mos7715_read_control(struct parport *pp)
{
struct mos7715_parport *mos_parport = pp->private_data;
__u8 dcr;
dbg("%s called", __func__);
spin_lock(&release_lock);
mos_parport = pp->private_data;
if (unlikely(mos_parport == NULL)) {
spin_unlock(&release_lock);
return 0;
}
dcr = mos_parport->shadowDCR & 0x0f;
spin_unlock(&release_lock);
return dcr;
}
static unsigned char parport_mos7715_frob_control(struct parport *pp,
unsigned char mask,
unsigned char val)
{
struct mos7715_parport *mos_parport = pp->private_data;
__u8 dcr;
dbg("%s called", __func__);
mask &= 0x0f;
val &= 0x0f;
if (parport_prologue(pp) < 0)
return 0;
mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val;
write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
dcr = mos_parport->shadowDCR & 0x0f;
parport_epilogue(pp);
return dcr;
}
static unsigned char parport_mos7715_read_status(struct parport *pp)
{
unsigned char status;
struct mos7715_parport *mos_parport = pp->private_data;
dbg("%s called", __func__);
spin_lock(&release_lock);
mos_parport = pp->private_data;
if (unlikely(mos_parport == NULL)) { /* release called */
spin_unlock(&release_lock);
return 0;
}
status = atomic_read(&mos_parport->shadowDSR) & 0xf8;
spin_unlock(&release_lock);
return status;
}
static void parport_mos7715_enable_irq(struct parport *pp)
{
dbg("%s called", __func__);
}
static void parport_mos7715_disable_irq(struct parport *pp)
{
dbg("%s called", __func__);
}
static void parport_mos7715_data_forward(struct parport *pp)
{
struct mos7715_parport *mos_parport = pp->private_data;
dbg("%s called", __func__);
if (parport_prologue(pp) < 0)
return;
mos7715_change_mode(mos_parport, PS2);
mos_parport->shadowDCR &= ~0x20;
write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
parport_epilogue(pp);
}
static void parport_mos7715_data_reverse(struct parport *pp)
{
struct mos7715_parport *mos_parport = pp->private_data;
dbg("%s called", __func__);
if (parport_prologue(pp) < 0)
return;
mos7715_change_mode(mos_parport, PS2);
mos_parport->shadowDCR |= 0x20;
write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
parport_epilogue(pp);
}
static void parport_mos7715_init_state(struct pardevice *dev,
struct parport_state *s)
{
dbg("%s called", __func__);
s->u.pc.ctr = DCR_INIT_VAL;
s->u.pc.ecr = ECR_INIT_VAL;
}
/* N.B. Parport core code requires that this function not block */
static void parport_mos7715_save_state(struct parport *pp,
struct parport_state *s)
{
struct mos7715_parport *mos_parport;
dbg("%s called", __func__);
spin_lock(&release_lock);
mos_parport = pp->private_data;
if (unlikely(mos_parport == NULL)) { /* release called */
spin_unlock(&release_lock);
return;
}
s->u.pc.ctr = mos_parport->shadowDCR;
s->u.pc.ecr = mos_parport->shadowECR;
spin_unlock(&release_lock);
}
/* N.B. Parport core code requires that this function not block */
static void parport_mos7715_restore_state(struct parport *pp,
struct parport_state *s)
{
struct mos7715_parport *mos_parport;
dbg("%s called", __func__);
spin_lock(&release_lock);
mos_parport = pp->private_data;
if (unlikely(mos_parport == NULL)) { /* release called */
spin_unlock(&release_lock);
return;
}
write_parport_reg_nonblock(mos_parport, DCR, mos_parport->shadowDCR);
write_parport_reg_nonblock(mos_parport, ECR, mos_parport->shadowECR);
spin_unlock(&release_lock);
}
static size_t parport_mos7715_write_compat(struct parport *pp,
const void *buffer,
size_t len, int flags)
{
int retval;
struct mos7715_parport *mos_parport = pp->private_data;
int actual_len;
dbg("%s called: %u chars", __func__, (unsigned int)len);
if (parport_prologue(pp) < 0)
return 0;
mos7715_change_mode(mos_parport, PPF);
retval = usb_bulk_msg(mos_parport->serial->dev,
usb_sndbulkpipe(mos_parport->serial->dev, 2),
(void *)buffer, len, &actual_len,
MOS_WDR_TIMEOUT);
parport_epilogue(pp);
if (retval) {
dev_err(&mos_parport->serial->dev->dev,
"mos7720: usb_bulk_msg() failed: %d", retval);
return 0;
}
return actual_len;
}
static struct parport_operations parport_mos7715_ops = {
.owner = THIS_MODULE,
.write_data = parport_mos7715_write_data,
.read_data = parport_mos7715_read_data,
.write_control = parport_mos7715_write_control,
.read_control = parport_mos7715_read_control,
.frob_control = parport_mos7715_frob_control,
.read_status = parport_mos7715_read_status,
.enable_irq = parport_mos7715_enable_irq,
.disable_irq = parport_mos7715_disable_irq,
.data_forward = parport_mos7715_data_forward,
.data_reverse = parport_mos7715_data_reverse,
.init_state = parport_mos7715_init_state,
.save_state = parport_mos7715_save_state,
.restore_state = parport_mos7715_restore_state,
.compat_write_data = parport_mos7715_write_compat,
.nibble_read_data = parport_ieee1284_read_nibble,
.byte_read_data = parport_ieee1284_read_byte,
};
/*
* Allocate and initialize parallel port control struct, initialize
* the parallel port hardware device, and register with the parport subsystem.
*/
static int mos7715_parport_init(struct usb_serial *serial)
{
struct mos7715_parport *mos_parport;
/* allocate and initialize parallel port control struct */
mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL);
if (mos_parport == NULL) {
dbg("mos7715_parport_init: kzalloc failed");
return -ENOMEM;
}
mos_parport->msg_pending = false;
kref_init(&mos_parport->ref_count);
spin_lock_init(&mos_parport->listlock);
INIT_LIST_HEAD(&mos_parport->active_urbs);
INIT_LIST_HEAD(&mos_parport->deferred_urbs);
usb_set_serial_data(serial, mos_parport); /* hijack private pointer */
mos_parport->serial = serial;
tasklet_init(&mos_parport->urb_tasklet, send_deferred_urbs,
(unsigned long) mos_parport);
init_completion(&mos_parport->syncmsg_compl);
/* cycle parallel port reset bit */
write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x80);
write_mos_reg(mos_parport->serial, dummy, PP_REG, (__u8)0x00);
/* initialize device registers */
mos_parport->shadowDCR = DCR_INIT_VAL;
write_mos_reg(mos_parport->serial, dummy, DCR, mos_parport->shadowDCR);
mos_parport->shadowECR = ECR_INIT_VAL;
write_mos_reg(mos_parport->serial, dummy, ECR, mos_parport->shadowECR);
/* register with parport core */
mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE,
PARPORT_DMA_NONE,
&parport_mos7715_ops);
if (mos_parport->pp == NULL) {
dev_err(&serial->interface->dev,
"Could not register parport\n");
kref_put(&mos_parport->ref_count, destroy_mos_parport);
return -EIO;
}
mos_parport->pp->private_data = mos_parport;
mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP;
mos_parport->pp->dev = &serial->interface->dev;
parport_announce_port(mos_parport->pp);
return 0;
}
#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */
/*
* mos7720_interrupt_callback
* this is the callback function for when we have received data on the
* interrupt endpoint.
*/
static void mos7720_interrupt_callback(struct urb *urb)
{
int result;
int length;
int status = urb->status;
__u8 *data;
__u8 sp1;
__u8 sp2;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __func__,
status);
return;
default:
dbg("%s - nonzero urb status received: %d", __func__,
status);
goto exit;
}
length = urb->actual_length;
data = urb->transfer_buffer;
/* Moschip get 4 bytes
* Byte 1 IIR Port 1 (port.number is 0)
* Byte 2 IIR Port 2 (port.number is 1)
* Byte 3 --------------
* Byte 4 FIFO status for both */
/* the above description is inverted
* oneukum 2007-03-14 */
if (unlikely(length != 4)) {
dbg("Wrong data !!!");
return;
}
sp1 = data[3];
sp2 = data[2];
if ((sp1 | sp2) & 0x01) {
/* No Interrupt Pending in both the ports */
dbg("No Interrupt !!!");
} else {
switch (sp1 & 0x0f) {
case SERIAL_IIR_RLS:
dbg("Serial Port 1: Receiver status error or address "
"bit detected in 9-bit mode\n");
break;
case SERIAL_IIR_CTI:
dbg("Serial Port 1: Receiver time out");
break;
case SERIAL_IIR_MS:
/* dbg("Serial Port 1: Modem status change"); */
break;
}
switch (sp2 & 0x0f) {
case SERIAL_IIR_RLS:
dbg("Serial Port 2: Receiver status error or address "
"bit detected in 9-bit mode");
break;
case SERIAL_IIR_CTI:
dbg("Serial Port 2: Receiver time out");
break;
case SERIAL_IIR_MS:
/* dbg("Serial Port 2: Modem status change"); */
break;
}
}
exit:
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(&urb->dev->dev,
"%s - Error %d submitting control urb\n",
__func__, result);
}
/*
* mos7715_interrupt_callback
* this is the 7715's callback function for when we have received data on
* the interrupt endpoint.
*/
static void mos7715_interrupt_callback(struct urb *urb)
{
int result;
int length;
int status = urb->status;
__u8 *data;
__u8 iir;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
case -ENODEV:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __func__,
status);
return;
default:
dbg("%s - nonzero urb status received: %d", __func__,
status);
goto exit;
}
length = urb->actual_length;
data = urb->transfer_buffer;
/* Structure of data from 7715 device:
* Byte 1: IIR serial Port
* Byte 2: unused
* Byte 2: DSR parallel port
* Byte 4: FIFO status for both */
if (unlikely(length != 4)) {
dbg("Wrong data !!!");
return;
}
iir = data[0];
if (!(iir & 0x01)) { /* serial port interrupt pending */
switch (iir & 0x0f) {
case SERIAL_IIR_RLS:
dbg("Serial Port: Receiver status error or address "
"bit detected in 9-bit mode\n");
break;
case SERIAL_IIR_CTI:
dbg("Serial Port: Receiver time out");
break;
case SERIAL_IIR_MS:
/* dbg("Serial Port: Modem status change"); */
break;
}
}
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
{ /* update local copy of DSR reg */
struct usb_serial_port *port = urb->context;
struct mos7715_parport *mos_parport = port->serial->private;
if (unlikely(mos_parport == NULL))
return;
atomic_set(&mos_parport->shadowDSR, data[2]);
}
#endif
exit:
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(&urb->dev->dev,
"%s - Error %d submitting control urb\n",
__func__, result);
}
/*
* mos7720_bulk_in_callback
* this is the callback function for when we have received data on the
* bulk in endpoint.
*/
static void mos7720_bulk_in_callback(struct urb *urb)
{
int retval;
unsigned char *data ;
struct usb_serial_port *port;
struct tty_struct *tty;
int status = urb->status;
if (status) {
dbg("nonzero read bulk status received: %d", status);
return;
}
port = urb->context;
dbg("Entering...%s", __func__);
data = urb->transfer_buffer;
tty = tty_port_tty_get(&port->port);
if (tty && urb->actual_length) {
tty_insert_flip_string(tty, data, urb->actual_length);
tty_flip_buffer_push(tty);
}
tty_kref_put(tty);
if (port->read_urb->status != -EINPROGRESS) {
retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (retval)
dbg("usb_submit_urb(read bulk) failed, retval = %d",
retval);
}
}
/*
* mos7720_bulk_out_data_callback
* this is the callback function for when we have finished sending serial
* data on the bulk out endpoint.
*/
static void mos7720_bulk_out_data_callback(struct urb *urb)
{
struct moschip_port *mos7720_port;
struct tty_struct *tty;
int status = urb->status;
if (status) {
dbg("nonzero write bulk status received:%d", status);
return;
}
mos7720_port = urb->context;
if (!mos7720_port) {
dbg("NULL mos7720_port pointer");
return ;
}
tty = tty_port_tty_get(&mos7720_port->port->port);
if (tty && mos7720_port->open)
tty_wakeup(tty);
tty_kref_put(tty);
}
/*
* mos77xx_probe
* this function installs the appropriate read interrupt endpoint callback
* depending on whether the device is a 7720 or 7715, thus avoiding costly
* run-time checks in the high-frequency callback routine itself.
*/
static int mos77xx_probe(struct usb_serial *serial,
const struct usb_device_id *id)
{
if (id->idProduct == MOSCHIP_DEVICE_ID_7715)
moschip7720_2port_driver.read_int_callback =
mos7715_interrupt_callback;
else
moschip7720_2port_driver.read_int_callback =
mos7720_interrupt_callback;
return 0;
}
static int mos77xx_calc_num_ports(struct usb_serial *serial)
{
u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
if (product == MOSCHIP_DEVICE_ID_7715)
return 1;
return 2;
}
static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct usb_serial *serial;
struct urb *urb;
struct moschip_port *mos7720_port;
int response;
int port_number;
__u8 data;
int allocated_urbs = 0;
int j;
serial = port->serial;
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_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, GFP_KERNEL);
mos7720_port->write_urb_pool[j] = urb;
if (urb == NULL) {
dev_err(&port->dev, "No more urbs???\n");
continue;
}
urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
GFP_KERNEL);
if (!urb->transfer_buffer) {
dev_err(&port->dev,
"%s-out of memory for urb buffers.\n",
__func__);
usb_free_urb(mos7720_port->write_urb_pool[j]);
mos7720_port->write_urb_pool[j] = NULL;
continue;
}
allocated_urbs++;
}
if (!allocated_urbs)
return -ENOMEM;
/* Initialize MCS7720 -- Write Init values to corresponding Registers
*
* Register Index
* 0 : THR/RHR
* 1 : IER
* 2 : FCR
* 3 : LCR
* 4 : MCR
* 5 : LSR
* 6 : MSR
* 7 : SPR
*
* 0x08 : SP1/2 Control Reg
*/
port_number = port->number - port->serial->minor;
read_mos_reg(serial, port_number, LSR, &data);
dbg("SS::%p LSR:%x", mos7720_port, data);
dbg("Check:Sending Command ..........");
write_mos_reg(serial, dummy, SP1_REG, 0x02);
write_mos_reg(serial, dummy, SP2_REG, 0x02);
write_mos_reg(serial, port_number, IER, 0x00);
write_mos_reg(serial, port_number, FCR, 0x00);
write_mos_reg(serial, port_number, FCR, 0xcf);
mos7720_port->shadowLCR = 0x03;
write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
mos7720_port->shadowMCR = 0x0b;
write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
write_mos_reg(serial, port_number, SP_CONTROL_REG, 0x00);
read_mos_reg(serial, dummy, SP_CONTROL_REG, &data);
data = data | (port->number - port->serial->minor + 1);
write_mos_reg(serial, dummy, SP_CONTROL_REG, data);
mos7720_port->shadowLCR = 0x83;
write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
write_mos_reg(serial, port_number, THR, 0x0c);
write_mos_reg(serial, port_number, IER, 0x00);
mos7720_port->shadowLCR = 0x03;
write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
write_mos_reg(serial, port_number, IER, 0x0c);
response = usb_submit_urb(port->read_urb, GFP_KERNEL);
if (response)
dev_err(&port->dev, "%s - Error %d submitting read urb\n",
__func__, response);
/* initialize our icount structure */
memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
/* initialize our port settings */
mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
/* send a open port command */
mos7720_port->open = 1;
return 0;
}
/*
* mos7720_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 mos7720_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int i;
int chars = 0;
struct moschip_port *mos7720_port;
dbg("%s:entering ...........", __func__);
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL) {
dbg("%s:leaving ...........", __func__);
return 0;
}
for (i = 0; i < NUM_URBS; ++i) {
if (mos7720_port->write_urb_pool[i] &&
mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
chars += URB_TRANSFER_BUFFER_SIZE;
}
dbg("%s - returns %d", __func__, chars);
return chars;
}
static void mos7720_close(struct usb_serial_port *port)
{
struct usb_serial *serial;
struct moschip_port *mos7720_port;
int j;
dbg("mos7720_close:entering...");
serial = port->serial;
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL)
return;
for (j = 0; j < NUM_URBS; ++j)
usb_kill_urb(mos7720_port->write_urb_pool[j]);
/* Freeing Write URBs */
for (j = 0; j < NUM_URBS; ++j) {
if (mos7720_port->write_urb_pool[j]) {
kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
usb_free_urb(mos7720_port->write_urb_pool[j]);
}
}
/* While closing port, shutdown all bulk read, write *
* and interrupt read if they exists, otherwise nop */
dbg("Shutdown bulk write");
usb_kill_urb(port->write_urb);
dbg("Shutdown bulk read");
usb_kill_urb(port->read_urb);
mutex_lock(&serial->disc_mutex);
/* these commands must not be issued if the device has
* been disconnected */
if (!serial->disconnected) {
write_mos_reg(serial, port->number - port->serial->minor,
MCR, 0x00);
write_mos_reg(serial, port->number - port->serial->minor,
IER, 0x00);
}
mutex_unlock(&serial->disc_mutex);
mos7720_port->open = 0;
dbg("Leaving %s", __func__);
}
static void mos7720_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 *mos7720_port;
dbg("Entering %s", __func__);
serial = port->serial;
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL)
return;
if (break_state == -1)
data = mos7720_port->shadowLCR | UART_LCR_SBC;
else
data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
mos7720_port->shadowLCR = data;
write_mos_reg(serial, port->number - port->serial->minor,
LCR, mos7720_port->shadowLCR);
}
/*
* mos7720_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 mos7720_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port;
int room = 0;
int i;
dbg("%s:entering ...........", __func__);
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL) {
dbg("%s:leaving ...........", __func__);
return -ENODEV;
}
/* FIXME: Locking */
for (i = 0; i < NUM_URBS; ++i) {
if (mos7720_port->write_urb_pool[i] &&
mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
room += URB_TRANSFER_BUFFER_SIZE;
}
dbg("%s - returns %d", __func__, room);
return room;
}
static int mos7720_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;
struct moschip_port *mos7720_port;
struct usb_serial *serial;
struct urb *urb;
const unsigned char *current_position = data;
dbg("%s:entering ...........", __func__);
serial = port->serial;
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL) {
dbg("mos7720_port is NULL");
return -ENODEV;
}
/* try to find a free urb in the list */
urb = NULL;
for (i = 0; i < NUM_URBS; ++i) {
if (mos7720_port->write_urb_pool[i] &&
mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
urb = mos7720_port->write_urb_pool[i];
dbg("URB:%d", i);
break;
}
}
if (urb == NULL) {
dbg("%s - no more free urbs", __func__);
goto exit;
}
if (urb->transfer_buffer == NULL) {
urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
GFP_KERNEL);
if (urb->transfer_buffer == NULL) {
dev_err(&port->dev, "%s no more kernel memory...\n",
__func__);
goto exit;
}
}
transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
memcpy(urb->transfer_buffer, current_position, transfer_size);
usb_serial_debug_data(debug, &port->dev, __func__, transfer_size,
urb->transfer_buffer);
/* 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,
mos7720_bulk_out_data_callback, mos7720_port);
/* send it down the pipe */
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
"with status = %d\n", __func__, status);
bytes_sent = status;
goto exit;
}
bytes_sent = transfer_size;
exit:
return bytes_sent;
}
static void mos7720_throttle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port;
int status;
dbg("%s- port %d", __func__, port->number);
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL)
return;
if (!mos7720_port->open) {
dbg("port not opened");
return;
}
dbg("%s: Entering ..........", __func__);
/* if we are implementing XON/XOFF, send the stop character */
if (I_IXOFF(tty)) {
unsigned char stop_char = STOP_CHAR(tty);
status = mos7720_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) {
mos7720_port->shadowMCR &= ~UART_MCR_RTS;
write_mos_reg(port->serial, port->number - port->serial->minor,
MCR, mos7720_port->shadowMCR);
if (status != 0)
return;
}
}
static void mos7720_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
int status;
if (mos7720_port == NULL)
return;
if (!mos7720_port->open) {
dbg("%s - port not opened", __func__);
return;
}
dbg("%s: Entering ..........", __func__);
/* if we are implementing XON/XOFF, send the start character */
if (I_IXOFF(tty)) {
unsigned char start_char = START_CHAR(tty);
status = mos7720_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) {
mos7720_port->shadowMCR |= UART_MCR_RTS;
write_mos_reg(port->serial, port->number - port->serial->minor,
MCR, mos7720_port->shadowMCR);
if (status != 0)
return;
}
}
/* FIXME: this function does not work */
static int set_higher_rates(struct moschip_port *mos7720_port,
unsigned int baud)
{
struct usb_serial_port *port;
struct usb_serial *serial;
int port_number;
enum mos_regs sp_reg;
if (mos7720_port == NULL)
return -EINVAL;
port = mos7720_port->port;
serial = port->serial;
/***********************************************
* Init Sequence for higher rates
***********************************************/
dbg("Sending Setting Commands ..........");
port_number = port->number - port->serial->minor;
write_mos_reg(serial, port_number, IER, 0x00);
write_mos_reg(serial, port_number, FCR, 0x00);
write_mos_reg(serial, port_number, FCR, 0xcf);
mos7720_port->shadowMCR = 0x0b;
write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x00);
/***********************************************
* Set for higher rates *
***********************************************/
/* writing baud rate verbatum into uart clock field clearly not right */
if (port_number == 0)
sp_reg = SP1_REG;
else
sp_reg = SP2_REG;
write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x03);
mos7720_port->shadowMCR = 0x2b;
write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
/***********************************************
* Set DLL/DLM
***********************************************/
mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
write_mos_reg(serial, port_number, DLL, 0x01);
write_mos_reg(serial, port_number, DLM, 0x00);
mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
return 0;
}
/* baud rate information */
struct divisor_table_entry {
__u32 baudrate;
__u16 divisor;
};
/* Define table of divisors for moschip 7720 hardware *
* These assume a 3.6864MHz crystal, the standard /16, and *
* MCR.7 = 0. */
static struct divisor_table_entry divisor_table[] = {
{ 50, 2304},
{ 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */
{ 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */
{ 150, 768},
{ 300, 384},
{ 600, 192},
{ 1200, 96},
{ 1800, 64},
{ 2400, 48},
{ 4800, 24},
{ 7200, 16},
{ 9600, 12},
{ 19200, 6},
{ 38400, 3},
{ 57600, 2},
{ 115200, 1},
};
/*****************************************************************************
* calc_baud_rate_divisor
* this function calculates the proper baud rate divisor for the specified
* baud rate.
*****************************************************************************/
static int calc_baud_rate_divisor(int baudrate, int *divisor)
{
int i;
__u16 custom;
__u16 round1;
__u16 round;
dbg("%s - %d", __func__, baudrate);
for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
if (divisor_table[i].baudrate == baudrate) {
*divisor = 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", baudrate, custom);
return 0;
}
dbg("Baud calculation Failed...");
return -EINVAL;
}
/*
* send_cmd_write_baud_rate
* this function sends the proper command to change the baud rate of the
* specified port.
*/
static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
int baudrate)
{
struct usb_serial_port *port;
struct usb_serial *serial;
int divisor;
int status;
unsigned char number;
if (mos7720_port == NULL)
return -1;
port = mos7720_port->port;
serial = port->serial;
dbg("%s: Entering ..........", __func__);
number = port->number - port->serial->minor;
dbg("%s - port = %d, baud = %d", __func__, port->number, baudrate);
/* Calculate the Divisor */
status = calc_baud_rate_divisor(baudrate, &divisor);
if (status) {
dev_err(&port->dev, "%s - bad baud rate\n", __func__);
return status;
}
/* Enable access to divisor latch */
mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
/* Write the divisor */
write_mos_reg(serial, number, DLL, (__u8)(divisor & 0xff));
write_mos_reg(serial, number, DLM, (__u8)((divisor & 0xff00) >> 8));
/* Disable access to divisor latch */
mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
write_mos_reg(serial, number, LCR, mos7720_port->shadowLCR);
return status;
}
/*
* change_port_settings
* This routine is called to set the UART on the device to match
* the specified new settings.
*/
static void change_port_settings(struct tty_struct *tty,
struct moschip_port *mos7720_port,
struct ktermios *old_termios)
{
struct usb_serial_port *port;
struct usb_serial *serial;
int baud;
unsigned cflag;
unsigned iflag;
__u8 mask = 0xff;
__u8 lData;
__u8 lParity;
__u8 lStop;
int status;
int port_number;
if (mos7720_port == NULL)
return ;
port = mos7720_port->port;
serial = port->serial;
port_number = port->number - port->serial->minor;
dbg("%s - port %d", __func__, port->number);
if (!mos7720_port->open) {
dbg("%s - port not opened", __func__);
return;
}
dbg("%s: Entering ..........", __func__);
lData = UART_LCR_WLEN8;
lStop = 0x00; /* 1 stop bit */
lParity = 0x00; /* No parity */
cflag = tty->termios->c_cflag;
iflag = tty->termios->c_iflag;
/* Change the number of bits */
switch (cflag & CSIZE) {
case CS5:
lData = UART_LCR_WLEN5;
mask = 0x1f;
break;
case CS6:
lData = UART_LCR_WLEN6;
mask = 0x3f;
break;
case CS7:
lData = UART_LCR_WLEN7;
mask = 0x7f;
break;
default:
case CS8:
lData = UART_LCR_WLEN8;
break;
}
/* Change the Parity bit */
if (cflag & PARENB) {
if (cflag & PARODD) {
lParity = UART_LCR_PARITY;
dbg("%s - parity = odd", __func__);
} else {
lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
dbg("%s - parity = even", __func__);
}
} else {
dbg("%s - parity = none", __func__);
}
if (cflag & CMSPAR)
lParity = lParity | 0x20;
/* Change the Stop bit */
if (cflag & CSTOPB) {
lStop = UART_LCR_STOP;
dbg("%s - stop bits = 2", __func__);
} else {
lStop = 0x00;
dbg("%s - stop bits = 1", __func__);
}
#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
#define LCR_PAR_MASK 0x38 /* Mask for parity field */
/* Update the LCR with the correct value */
mos7720_port->shadowLCR &=
~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
mos7720_port->shadowLCR |= (lData | lParity | lStop);
/* Disable Interrupts */
write_mos_reg(serial, port_number, IER, 0x00);
write_mos_reg(serial, port_number, FCR, 0x00);
write_mos_reg(serial, port_number, FCR, 0xcf);
/* Send the updated LCR value to the mos7720 */
write_mos_reg(serial, port_number, LCR, mos7720_port->shadowLCR);
mos7720_port->shadowMCR = 0x0b;
write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
/* set up the MCR register and send it to the mos7720 */
mos7720_port->shadowMCR = UART_MCR_OUT2;
if (cflag & CBAUD)
mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
if (cflag & CRTSCTS) {
mos7720_port->shadowMCR |= (UART_MCR_XONANY);
/* To set hardware flow control to the specified *
* serial port, in SP1/2_CONTROL_REG */
if (port->number)
write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x01);
else
write_mos_reg(serial, dummy, SP_CONTROL_REG, 0x02);
} else
mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
write_mos_reg(serial, port_number, MCR, mos7720_port->shadowMCR);
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(tty);
if (!baud) {
/* pick a default, any default... */
dbg("Picked default baud...");
baud = 9600;
}
if (baud >= 230400) {
set_higher_rates(mos7720_port, baud);
/* Enable Interrupts */
write_mos_reg(serial, port_number, IER, 0x0c);
return;
}
dbg("%s - baud rate = %d", __func__, baud);
status = send_cmd_write_baud_rate(mos7720_port, baud);
/* FIXME: needs to write actual resulting baud back not just
blindly do so */
if (cflag & CBAUD)
tty_encode_baud_rate(tty, baud, baud);
/* Enable Interrupts */
write_mos_reg(serial, port_number, IER, 0x0c);
if (port->read_urb->status != -EINPROGRESS) {
status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (status)
dbg("usb_submit_urb(read bulk) failed, status = %d",
status);
}
}
/*
* mos7720_set_termios
* this function is called by the tty driver when it wants to change the
* termios structure.
*/
static void mos7720_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 *mos7720_port;
serial = port->serial;
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL)
return;
if (!mos7720_port->open) {
dbg("%s - port not opened", __func__);
return;
}
dbg("%s\n", "setting termios - ASPIRE");
cflag = tty->termios->c_cflag;
dbg("%s - cflag %08x iflag %08x", __func__,
tty->termios->c_cflag,
RELEVANT_IFLAG(tty->termios->c_iflag));
dbg("%s - old cflag %08x old iflag %08x", __func__,
old_termios->c_cflag,
RELEVANT_IFLAG(old_termios->c_iflag));
dbg("%s - port %d", __func__, port->number);
/* change the port settings to the new ones specified */
change_port_settings(tty, mos7720_port, old_termios);
if (port->read_urb->status != -EINPROGRESS) {
status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (status)
dbg("usb_submit_urb(read bulk) failed, status = %d",
status);
}
}
/*
* 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 get_lsr_info(struct tty_struct *tty,
struct moschip_port *mos7720_port, unsigned int __user *value)
{
struct usb_serial_port *port = tty->driver_data;
unsigned int result = 0;
unsigned char data = 0;
int port_number = port->number - port->serial->minor;
int count;
count = mos7720_chars_in_buffer(tty);
if (count == 0) {
read_mos_reg(port->serial, port_number, LSR, &data);
if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
== (UART_LSR_TEMT | UART_LSR_THRE)) {
dbg("%s -- Empty", __func__);
result = TIOCSER_TEMT;
}
}
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
static int mos7720_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
unsigned int result = 0;
unsigned int mcr ;
unsigned int msr ;
dbg("%s - port %d", __func__, port->number);
mcr = mos7720_port->shadowMCR;
msr = mos7720_port->shadowMSR;
result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */
| ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */
| ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */
| ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */
| ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */
| ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
dbg("%s -- %x", __func__, result);
return result;
}
static int mos7720_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
unsigned int mcr ;
dbg("%s - port %d", __func__, port->number);
dbg("he was at tiocmset");
mcr = mos7720_port->shadowMCR;
if (set & TIOCM_RTS)
mcr |= UART_MCR_RTS;
if (set & TIOCM_DTR)
mcr |= UART_MCR_DTR;
if (set & TIOCM_LOOP)
mcr |= UART_MCR_LOOP;
if (clear & TIOCM_RTS)
mcr &= ~UART_MCR_RTS;
if (clear & TIOCM_DTR)
mcr &= ~UART_MCR_DTR;
if (clear & TIOCM_LOOP)
mcr &= ~UART_MCR_LOOP;
mos7720_port->shadowMCR = mcr;
write_mos_reg(port->serial, port->number - port->serial->minor,
MCR, mos7720_port->shadowMCR);
return 0;
}
static int mos7720_get_icount(struct tty_struct *tty,
struct serial_icounter_struct *icount)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port;
struct async_icount cnow;
mos7720_port = usb_get_serial_port_data(port);
cnow = mos7720_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", __func__,
port->number, icount->rx, icount->tx);
return 0;
}
static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
unsigned int __user *value)
{
unsigned int mcr;
unsigned int arg;
struct usb_serial_port *port;
if (mos7720_port == NULL)
return -1;
port = (struct usb_serial_port *)mos7720_port->port;
mcr = mos7720_port->shadowMCR;
if (copy_from_user(&arg, value, sizeof(int)))
return -EFAULT;
switch (cmd) {
case TIOCMBIS:
if (arg & TIOCM_RTS)
mcr |= UART_MCR_RTS;
if (arg & TIOCM_DTR)
mcr |= UART_MCR_RTS;
if (arg & TIOCM_LOOP)
mcr |= UART_MCR_LOOP;
break;
case TIOCMBIC:
if (arg & TIOCM_RTS)
mcr &= ~UART_MCR_RTS;
if (arg & TIOCM_DTR)
mcr &= ~UART_MCR_RTS;
if (arg & TIOCM_LOOP)
mcr &= ~UART_MCR_LOOP;
break;
}
mos7720_port->shadowMCR = mcr;
write_mos_reg(port->serial, port->number - port->serial->minor,
MCR, mos7720_port->shadowMCR);
return 0;
}
static int get_serial_info(struct moschip_port *mos7720_port,
struct serial_struct __user *retinfo)
{
struct serial_struct tmp;
if (!retinfo)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = PORT_16550A;
tmp.line = mos7720_port->port->serial->minor;
tmp.port = mos7720_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;
}
static int mos7720_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port;
struct async_icount cnow;
struct async_icount cprev;
mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL)
return -ENODEV;
dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
switch (cmd) {
case TIOCSERGETLSR:
dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
return get_lsr_info(tty, mos7720_port,
(unsigned int __user *)arg);
/* FIXME: These should be using the mode methods */
case TIOCMBIS:
case TIOCMBIC:
dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET",
__func__, port->number);
return set_modem_info(mos7720_port, cmd,
(unsigned int __user *)arg);
case TIOCGSERIAL:
dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
return get_serial_info(mos7720_port,
(struct serial_struct __user *)arg);
case TIOCMIWAIT:
dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
cprev = mos7720_port->icount;
while (1) {
if (signal_pending(current))
return -ERESTARTSYS;
cnow = mos7720_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;
}
return -ENOIOCTLCMD;
}
static int mos7720_startup(struct usb_serial *serial)
{
struct moschip_port *mos7720_port;
struct usb_device *dev;
int i;
char data;
u16 product;
int ret_val;
dbg("%s: Entering ..........", __func__);
if (!serial) {
dbg("Invalid Handler");
return -ENODEV;
}
product = le16_to_cpu(serial->dev->descriptor.idProduct);
dev = serial->dev;
/*
* The 7715 uses the first bulk in/out endpoint pair for the parallel
* port, and the second for the serial port. Because the usbserial core
* assumes both pairs are serial ports, we must engage in a bit of
* subterfuge and swap the pointers for ports 0 and 1 in order to make
* port 0 point to the serial port. However, both moschip devices use a
* single interrupt-in endpoint for both ports (as mentioned a little
* further down), and this endpoint was assigned to port 0. So after
* the swap, we must copy the interrupt endpoint elements from port 1
* (as newly assigned) to port 0, and null out port 1 pointers.
*/
if (product == MOSCHIP_DEVICE_ID_7715) {
struct usb_serial_port *tmp = serial->port[0];
serial->port[0] = serial->port[1];
serial->port[1] = tmp;
serial->port[0]->interrupt_in_urb = tmp->interrupt_in_urb;
serial->port[0]->interrupt_in_buffer = tmp->interrupt_in_buffer;
serial->port[0]->interrupt_in_endpointAddress =
tmp->interrupt_in_endpointAddress;
serial->port[1]->interrupt_in_urb = NULL;
serial->port[1]->interrupt_in_buffer = NULL;
}
/* set up serial port private structures */
for (i = 0; i < serial->num_ports; ++i) {
mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
if (mos7720_port == NULL) {
dev_err(&dev->dev, "%s - Out of memory\n", __func__);
return -ENOMEM;
}
/* Initialize all port interrupt end point to port 0 int
* endpoint. Our device has only one interrupt endpoint
* common to all ports */
serial->port[i]->interrupt_in_endpointAddress =
serial->port[0]->interrupt_in_endpointAddress;
mos7720_port->port = serial->port[i];
usb_set_serial_port_data(serial->port[i], mos7720_port);
dbg("port number is %d", serial->port[i]->number);
dbg("serial number is %d", serial->minor);
}
/* setting configuration feature to one */
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
(__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5*HZ);
/* start the interrupt urb */
ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL);
if (ret_val)
dev_err(&dev->dev,
"%s - Error %d submitting control urb\n",
__func__, ret_val);
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
if (product == MOSCHIP_DEVICE_ID_7715) {
ret_val = mos7715_parport_init(serial);
if (ret_val < 0)
return ret_val;
}
#endif
/* LSR For Port 1 */
read_mos_reg(serial, 0, LSR, &data);
dbg("LSR:%x", data);
return 0;
}
static void mos7720_release(struct usb_serial *serial)
{
int i;
#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT
/* close the parallel port */
if (le16_to_cpu(serial->dev->descriptor.idProduct)
== MOSCHIP_DEVICE_ID_7715) {
struct urbtracker *urbtrack;
unsigned long flags;
struct mos7715_parport *mos_parport =
usb_get_serial_data(serial);
/* prevent NULL ptr dereference in port callbacks */
spin_lock(&release_lock);
mos_parport->pp->private_data = NULL;
spin_unlock(&release_lock);
/* wait for synchronous usb calls to return */
if (mos_parport->msg_pending)
wait_for_completion_timeout(&mos_parport->syncmsg_compl,
MOS_WDR_TIMEOUT);
parport_remove_port(mos_parport->pp);
usb_set_serial_data(serial, NULL);
mos_parport->serial = NULL;
/* if tasklet currently scheduled, wait for it to complete */
tasklet_kill(&mos_parport->urb_tasklet);
/* unlink any urbs sent by the tasklet */
spin_lock_irqsave(&mos_parport->listlock, flags);
list_for_each_entry(urbtrack,
&mos_parport->active_urbs,
urblist_entry)
usb_unlink_urb(urbtrack->urb);
spin_unlock_irqrestore(&mos_parport->listlock, flags);
kref_put(&mos_parport->ref_count, destroy_mos_parport);
}
#endif
/* free private structure allocated for serial port */
for (i = 0; i < serial->num_ports; ++i)
kfree(usb_get_serial_port_data(serial->port[i]));
}
static struct usb_driver usb_driver = {
.name = "moschip7720",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = moschip_port_id_table,
.no_dynamic_id = 1,
};
static struct usb_serial_driver moschip7720_2port_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "moschip7720",
},
.description = "Moschip 2 port adapter",
.usb_driver = &usb_driver,
.id_table = moschip_port_id_table,
.calc_num_ports = mos77xx_calc_num_ports,
.open = mos7720_open,
.close = mos7720_close,
.throttle = mos7720_throttle,
.unthrottle = mos7720_unthrottle,
.probe = mos77xx_probe,
.attach = mos7720_startup,
.release = mos7720_release,
.ioctl = mos7720_ioctl,
.tiocmget = mos7720_tiocmget,
.tiocmset = mos7720_tiocmset,
.get_icount = mos7720_get_icount,
.set_termios = mos7720_set_termios,
.write = mos7720_write,
.write_room = mos7720_write_room,
.chars_in_buffer = mos7720_chars_in_buffer,
.break_ctl = mos7720_break,
.read_bulk_callback = mos7720_bulk_in_callback,
.read_int_callback = NULL /* dynamically assigned in probe() */
};
static int __init moschip7720_init(void)
{
int retval;
dbg("%s: Entering ..........", __func__);
/* Register with the usb serial */
retval = usb_serial_register(&moschip7720_2port_driver);
if (retval)
goto failed_port_device_register;
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
DRIVER_DESC "\n");
/* Register with the usb */
retval = usb_register(&usb_driver);
if (retval)
goto failed_usb_register;
return 0;
failed_usb_register:
usb_serial_deregister(&moschip7720_2port_driver);
failed_port_device_register:
return retval;
}
static void __exit moschip7720_exit(void)
{
usb_deregister(&usb_driver);
usb_serial_deregister(&moschip7720_2port_driver);
}
module_init(moschip7720_init);
module_exit(moschip7720_exit);
/* Module information */
MODULE_AUTHOR(DRIVER_AUTHOR);
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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