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mos7720.c
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mos7720.c
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// SPDX-License-Identifier: GPL-2.0
/*
* mos7720.c
* Controls the Moschip 7720 usb to dual port serial converter
*
* Copyright 2006 Moschip Semiconductor Tech. Ltd.
*
* 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/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>
#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
#define DRIVER_DESC "Moschip USB Serial Driver"
/* default urb timeout */
#define MOS_WDR_TIMEOUT 5000
#define MOS_MAX_PORT 0x02
#define MOS_WRITE 0x0E
#define MOS_READ 0x0D
/* Interrupt Routines 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 usb_serial_port *port; /* loop back to the owner */
struct urb *write_urb_pool[NUM_URBS];
};
#define USB_VENDOR_ID_MOSCHIP 0x9710
#define MOSCHIP_DEVICE_ID_7720 0x7720
#define MOSCHIP_DEVICE_ID_7715 0x7715
static const struct usb_device_id 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, 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;
struct usb_ctrlrequest *setup;
};
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 {
MOS7720_THR, /* serial port regs */
MOS7720_RHR,
MOS7720_IER,
MOS7720_FCR,
MOS7720_ISR,
MOS7720_LCR,
MOS7720_MCR,
MOS7720_LSR,
MOS7720_MSR,
MOS7720_SPR,
MOS7720_DLL,
MOS7720_DLM,
MOS7720_DPR, /* parallel port regs */
MOS7720_DSR,
MOS7720_DCR,
MOS7720_ECR,
MOS7720_SP1_REG, /* device control regs */
MOS7720_SP2_REG, /* serial port 2 (7720 only) */
MOS7720_PP_REG,
MOS7720_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, /* MOS7720_THR */
0x00, /* MOS7720_RHR */
0x01, /* MOS7720_IER */
0x02, /* MOS7720_FCR */
0x02, /* MOS7720_ISR */
0x03, /* MOS7720_LCR */
0x04, /* MOS7720_MCR */
0x05, /* MOS7720_LSR */
0x06, /* MOS7720_MSR */
0x07, /* MOS7720_SPR */
0x00, /* MOS7720_DLL */
0x01, /* MOS7720_DLM */
0x00, /* MOS7720_DPR */
0x01, /* MOS7720_DSR */
0x02, /* MOS7720_DCR */
0x0a, /* MOS7720_ECR */
0x01, /* MOS7720_SP1_REG */
0x02, /* MOS7720_SP2_REG (7720 only) */
0x04, /* MOS7720_PP_REG (7715 only) */
0x08, /* MOS7720_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 >= MOS7720_SP1_REG) /* control reg */
return 0x0000;
else if (reg >= MOS7720_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\n", 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);
u8 *buf;
int status;
buf = kmalloc(1, GFP_KERNEL);
if (!buf) {
*data = 0;
return -ENOMEM;
}
status = usb_control_msg(usbdev, pipe, request, requesttype, value,
index, buf, 1, MOS_WDR_TIMEOUT);
if (status == 1) {
*data = *buf;
} else {
dev_err(&usbdev->dev,
"mos7720: usb_control_msg() failed: %d\n", status);
if (status >= 0)
status = -EIO;
*data = 0;
}
kfree(buf);
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, MOS7720_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);
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;
usb_free_urb(urbtrack->urb);
kfree(urbtrack->setup);
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(struct tasklet_struct *t)
{
int ret_val;
unsigned long flags;
struct mos7715_parport *mos_parport = from_tasklet(mos_parport, t,
urb_tasklet);
struct urbtracker *urbtrack, *tmp;
struct list_head *cursor, *next;
struct device *dev;
/* if release function ran, game over */
if (unlikely(mos_parport->serial == NULL))
return;
dev = &mos_parport->serial->dev->dev;
/* try again to get the mutex */
if (!mutex_trylock(&mos_parport->serial->disc_mutex)) {
dev_dbg(dev, "%s: rescheduling tasklet\n", __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);
dev_dbg(dev, "%s: deferred_urbs list empty\n", __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_safe(urbtrack, tmp, &mos_parport->active_urbs,
urblist_entry) {
ret_val = usb_submit_urb(urbtrack->urb, GFP_ATOMIC);
dev_dbg(dev, "%s: urb submitted\n", __func__);
if (ret_val) {
dev_err(dev, "usb_submit_urb() failed: %d\n", 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;
unsigned long flags;
if (unlikely(status))
dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n", __func__, status);
/* remove the urbtracker from the active_urbs list */
spin_lock_irqsave(&urbtrack->mos_parport->listlock, flags);
list_del(&urbtrack->urblist_entry);
spin_unlock_irqrestore(&urbtrack->mos_parport->listlock, flags);
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_serial *serial = mos_parport->serial;
struct usb_device *usbdev = serial->dev;
/* create and initialize the control urb and containing urbtracker */
urbtrack = kmalloc(sizeof(struct urbtracker), GFP_ATOMIC);
if (!urbtrack)
return -ENOMEM;
urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urbtrack->urb) {
kfree(urbtrack);
return -ENOMEM;
}
urbtrack->setup = kmalloc(sizeof(*urbtrack->setup), GFP_ATOMIC);
if (!urbtrack->setup) {
usb_free_urb(urbtrack->urb);
kfree(urbtrack);
return -ENOMEM;
}
urbtrack->setup->bRequestType = (__u8)0x40;
urbtrack->setup->bRequest = (__u8)0x0e;
urbtrack->setup->wValue = cpu_to_le16(get_reg_value(reg, dummy));
urbtrack->setup->wIndex = cpu_to_le16(get_reg_index(reg));
urbtrack->setup->wLength = 0;
usb_fill_control_urb(urbtrack->urb, usbdev,
usb_sndctrlpipe(usbdev, 0),
(unsigned char *)urbtrack->setup,
NULL, 0, async_complete, urbtrack);
kref_get(&mos_parport->ref_count);
urbtrack->mos_parport = mos_parport;
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);
dev_dbg(&usbdev->dev, "tasklet scheduled\n");
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\n", __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 message 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 */
reinit_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 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;
if (parport_prologue(pp) < 0)
return;
mos7715_change_mode(mos_parport, SPP);
write_mos_reg(mos_parport->serial, dummy, MOS7720_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;
if (parport_prologue(pp) < 0)
return 0;
read_mos_reg(mos_parport->serial, dummy, MOS7720_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;
if (parport_prologue(pp) < 0)
return;
data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0);
write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data);
mos_parport->shadowDCR = data;
parport_epilogue(pp);
}
static unsigned char parport_mos7715_read_control(struct parport *pp)
{
struct mos7715_parport *mos_parport;
__u8 dcr;
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;
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, MOS7720_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;
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)
{
}
static void parport_mos7715_disable_irq(struct parport *pp)
{
}
static void parport_mos7715_data_forward(struct parport *pp)
{
struct mos7715_parport *mos_parport = pp->private_data;
if (parport_prologue(pp) < 0)
return;
mos7715_change_mode(mos_parport, PS2);
mos_parport->shadowDCR &= ~0x20;
write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
mos_parport->shadowDCR);
parport_epilogue(pp);
}
static void parport_mos7715_data_reverse(struct parport *pp)
{
struct mos7715_parport *mos_parport = pp->private_data;
if (parport_prologue(pp) < 0)
return;
mos7715_change_mode(mos_parport, PS2);
mos_parport->shadowDCR |= 0x20;
write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
mos_parport->shadowDCR);
parport_epilogue(pp);
}
static void parport_mos7715_init_state(struct pardevice *dev,
struct parport_state *s)
{
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;
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;
spin_lock(&release_lock);
mos_parport = pp->private_data;
if (unlikely(mos_parport == NULL)) { /* release called */
spin_unlock(&release_lock);
return;
}
mos_parport->shadowDCR = s->u.pc.ctr;
mos_parport->shadowECR = s->u.pc.ecr;
write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
mos_parport->shadowDCR);
write_parport_reg_nonblock(mos_parport, MOS7720_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;
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\n", 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)
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_setup(&mos_parport->urb_tasklet, send_deferred_urbs);
init_completion(&mos_parport->syncmsg_compl);
/* cycle parallel port reset bit */
write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80);
write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00);
/* initialize device registers */
mos_parport->shadowDCR = DCR_INIT_VAL;
write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR,
mos_parport->shadowDCR);
mos_parport->shadowECR = ECR_INIT_VAL;
write_mos_reg(mos_parport->serial, dummy, MOS7720_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;
struct device *dev = &urb->dev->dev;
__u8 *data;
__u8 sp1;
__u8 sp2;
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);
return;
default:
dev_dbg(dev, "%s - nonzero urb status received: %d\n", __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)) {
dev_dbg(dev, "Wrong data !!!\n");
return;
}
sp1 = data[3];
sp2 = data[2];
if ((sp1 | sp2) & 0x01) {
/* No Interrupt Pending in both the ports */
dev_dbg(dev, "No Interrupt !!!\n");
} else {
switch (sp1 & 0x0f) {
case SERIAL_IIR_RLS:
dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n");
break;
case SERIAL_IIR_CTI:
dev_dbg(dev, "Serial Port 1: Receiver time out\n");
break;
case SERIAL_IIR_MS:
/* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */
break;
}
switch (sp2 & 0x0f) {
case SERIAL_IIR_RLS:
dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n");
break;
case SERIAL_IIR_CTI:
dev_dbg(dev, "Serial Port 2: Receiver time out\n");
break;
case SERIAL_IIR_MS:
/* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */
break;
}
}
exit:
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(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;
struct device *dev = &urb->dev->dev;
__u8 *data;
__u8 iir;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
case -ENODEV:
/* this urb is terminated, clean up */
dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
return;
default:
dev_dbg(dev, "%s - nonzero urb status received: %d\n", __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)) {
dev_dbg(dev, "Wrong data !!!\n");
return;
}
iir = data[0];
if (!(iir & 0x01)) { /* serial port interrupt pending */
switch (iir & 0x0f) {
case SERIAL_IIR_RLS:
dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n");
break;
case SERIAL_IIR_CTI:
dev_dbg(dev, "Serial Port: Receiver time out\n");
break;
case SERIAL_IIR_MS:
/* dev_dbg(dev, "Serial Port: Modem status change\n"); */
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(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;
int status = urb->status;
if (status) {
dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
return;
}
port = urb->context;
dev_dbg(&port->dev, "Entering...%s\n", __func__);
data = urb->transfer_buffer;
if (urb->actual_length) {
tty_insert_flip_string(&port->port, data, urb->actual_length);
tty_flip_buffer_push(&port->port);
}
if (port->read_urb->status != -EINPROGRESS) {
retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
if (retval)
dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", 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;
int status = urb->status;
if (status) {
dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status);
return;
}
mos7720_port = urb->context;
if (!mos7720_port) {
dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n");
return ;
}
if (mos7720_port->open)
tty_port_tty_wakeup(&mos7720_port->port->port);
}
static int mos77xx_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
if (product == MOSCHIP_DEVICE_ID_7715) {
/*
* The 7715 uses the first bulk in/out endpoint pair for the
* parallel port, and the second for the serial port. We swap
* the endpoint descriptors here so that the the first and
* only registered port structure uses the serial-port
* endpoints.
*/
swap(epds->bulk_in[0], epds->bulk_in[1]);
swap(epds->bulk_out[0], epds->bulk_out[1]);
return 1;
}
return 2;
}
static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port)