![Alexey Khoroshilov](/assets/img/avatar_default.png)
There is an allocation with GFP_KERNEL flag in mos7720_write(),
while it may be called from interrupt context.
Follow-up for commit 1912528376
("USB: kobil_sct: fix non-atomic
allocation in write path")
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2085 lines
57 KiB
C
2085 lines
57 KiB
C
/*
|
|
* mos7720.c
|
|
* Controls the Moschip 7720 usb to dual port serial converter
|
|
*
|
|
* 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/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];
|
|
};
|
|
|
|
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 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)
|
|
return -ENOMEM;
|
|
|
|
status = usb_control_msg(usbdev, pipe, request, requesttype, value,
|
|
index, buf, 1, MOS_WDR_TIMEOUT);
|
|
if (status == 1)
|
|
*data = *buf;
|
|
else if (status < 0)
|
|
dev_err(&usbdev->dev,
|
|
"mos7720: usb_control_msg() failed: %d\n", status);
|
|
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(unsigned long _mos_parport)
|
|
{
|
|
int ret_val;
|
|
unsigned long flags;
|
|
struct mos7715_parport *mos_parport = (void *)_mos_parport;
|
|
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;
|
|
|
|
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(&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_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;
|
|
|
|
kref_get(&mos_parport->ref_count);
|
|
urbtrack->mos_parport = mos_parport;
|
|
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_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 = pp->private_data;
|
|
__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 = pp->private_data;
|
|
|
|
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;
|
|
}
|
|
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_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, 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);
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
continue;
|
|
|
|
urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
|
|
GFP_KERNEL);
|
|
if (!urb->transfer_buffer) {
|
|
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 : MOS7720_THR/MOS7720_RHR
|
|
* 1 : MOS7720_IER
|
|
* 2 : MOS7720_FCR
|
|
* 3 : MOS7720_LCR
|
|
* 4 : MOS7720_MCR
|
|
* 5 : MOS7720_LSR
|
|
* 6 : MOS7720_MSR
|
|
* 7 : MOS7720_SPR
|
|
*
|
|
* 0x08 : SP1/2 Control Reg
|
|
*/
|
|
port_number = port->port_number;
|
|
read_mos_reg(serial, port_number, MOS7720_LSR, &data);
|
|
|
|
dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data);
|
|
|
|
write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02);
|
|
write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02);
|
|
|
|
write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
|
|
write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
|
|
|
|
write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
|
|
mos7720_port->shadowLCR = 0x03;
|
|
write_mos_reg(serial, port_number, MOS7720_LCR,
|
|
mos7720_port->shadowLCR);
|
|
mos7720_port->shadowMCR = 0x0b;
|
|
write_mos_reg(serial, port_number, MOS7720_MCR,
|
|
mos7720_port->shadowMCR);
|
|
|
|
write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00);
|
|
read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data);
|
|
data = data | (port->port_number + 1);
|
|
write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data);
|
|
mos7720_port->shadowLCR = 0x83;
|
|
write_mos_reg(serial, port_number, MOS7720_LCR,
|
|
mos7720_port->shadowLCR);
|
|
write_mos_reg(serial, port_number, MOS7720_THR, 0x0c);
|
|
write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
|
|
mos7720_port->shadowLCR = 0x03;
|
|
write_mos_reg(serial, port_number, MOS7720_LCR,
|
|
mos7720_port->shadowLCR);
|
|
write_mos_reg(serial, port_number, MOS7720_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 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;
|
|
|
|
mos7720_port = usb_get_serial_port_data(port);
|
|
if (mos7720_port == NULL)
|
|
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;
|
|
}
|
|
dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
|
|
return chars;
|
|
}
|
|
|
|
static void mos7720_close(struct usb_serial_port *port)
|
|
{
|
|
struct usb_serial *serial;
|
|
struct moschip_port *mos7720_port;
|
|
int j;
|
|
|
|
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 */
|
|
usb_kill_urb(port->write_urb);
|
|
usb_kill_urb(port->read_urb);
|
|
|
|
write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00);
|
|
write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00);
|
|
|
|
mos7720_port->open = 0;
|
|
}
|
|
|
|
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;
|
|
|
|
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->port_number, MOS7720_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;
|
|
|
|
mos7720_port = usb_get_serial_port_data(port);
|
|
if (mos7720_port == NULL)
|
|
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;
|
|
}
|
|
|
|
dev_dbg(&port->dev, "%s - returns %d\n", __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;
|
|
|
|
serial = port->serial;
|
|
|
|
mos7720_port = usb_get_serial_port_data(port);
|
|
if (mos7720_port == 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];
|
|
dev_dbg(&port->dev, "URB:%d\n", i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
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_ATOMIC);
|
|
if (!urb->transfer_buffer)
|
|
goto exit;
|
|
}
|
|
transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
|
|
|
|
memcpy(urb->transfer_buffer, current_position, transfer_size);
|
|
usb_serial_debug_data(&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_console(port, "%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;
|
|
|
|
mos7720_port = usb_get_serial_port_data(port);
|
|
|
|
if (mos7720_port == NULL)
|
|
return;
|
|
|
|
if (!mos7720_port->open) {
|
|
dev_dbg(&port->dev, "%s - port not opened\n", __func__);
|
|
return;
|
|
}
|
|
|
|
/* 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 (C_CRTSCTS(tty)) {
|
|
mos7720_port->shadowMCR &= ~UART_MCR_RTS;
|
|
write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
|
|
mos7720_port->shadowMCR);
|
|
}
|
|
}
|
|
|
|
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) {
|
|
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 = mos7720_write(tty, port, &start_char, 1);
|
|
if (status <= 0)
|
|
return;
|
|
}
|
|
|
|
/* if we are implementing RTS/CTS, toggle that line */
|
|
if (C_CRTSCTS(tty)) {
|
|
mos7720_port->shadowMCR |= UART_MCR_RTS;
|
|
write_mos_reg(port->serial, port->port_number, MOS7720_MCR,
|
|
mos7720_port->shadowMCR);
|
|
}
|
|
}
|
|
|
|
/* 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
|
|
***********************************************/
|
|
dev_dbg(&port->dev, "Sending Setting Commands ..........\n");
|
|
port_number = port->port_number;
|
|
|
|
write_mos_reg(serial, port_number, MOS7720_IER, 0x00);
|
|
write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
|
|
write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
|
|
mos7720_port->shadowMCR = 0x0b;
|
|
write_mos_reg(serial, port_number, MOS7720_MCR,
|
|
mos7720_port->shadowMCR);
|
|
write_mos_reg(serial, dummy, MOS7720_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 = MOS7720_SP1_REG;
|
|
else
|
|
sp_reg = MOS7720_SP2_REG;
|
|
write_mos_reg(serial, dummy, sp_reg, baud * 0x10);
|
|
write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03);
|
|
mos7720_port->shadowMCR = 0x2b;
|
|
write_mos_reg(serial, port_number, MOS7720_MCR,
|
|
mos7720_port->shadowMCR);
|
|
|
|
/***********************************************
|
|
* Set DLL/DLM
|
|
***********************************************/
|
|
mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB;
|
|
write_mos_reg(serial, port_number, MOS7720_LCR,
|
|
mos7720_port->shadowLCR);
|
|
write_mos_reg(serial, port_number, MOS7720_DLL, 0x01);
|
|
write_mos_reg(serial, port_number, MOS7720_DLM, 0x00);
|
|
mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
|
|
write_mos_reg(serial, port_number, MOS7720_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(struct usb_serial_port *port, int baudrate, int *divisor)
|
|
{
|
|
int i;
|
|
__u16 custom;
|
|
__u16 round1;
|
|
__u16 round;
|
|
|
|
|
|
dev_dbg(&port->dev, "%s - %d\n", __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;
|
|
|
|
dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom);
|
|
return 0;
|
|
}
|
|
|
|
dev_dbg(&port->dev, "Baud calculation Failed...\n");
|
|
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;
|
|
|
|
number = port->port_number;
|
|
dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate);
|
|
|
|
/* Calculate the Divisor */
|
|
status = calc_baud_rate_divisor(port, 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, MOS7720_LCR, mos7720_port->shadowLCR);
|
|
|
|
/* Write the divisor */
|
|
write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff));
|
|
write_mos_reg(serial, number, MOS7720_DLM,
|
|
(__u8)((divisor & 0xff00) >> 8));
|
|
|
|
/* Disable access to divisor latch */
|
|
mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
|
|
write_mos_reg(serial, number, MOS7720_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->port_number;
|
|
|
|
if (!mos7720_port->open) {
|
|
dev_dbg(&port->dev, "%s - port not opened\n", __func__);
|
|
return;
|
|
}
|
|
|
|
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;
|
|
dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
|
|
} else {
|
|
lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
|
|
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 = UART_LCR_STOP;
|
|
dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
|
|
} else {
|
|
lStop = 0x00;
|
|
dev_dbg(&port->dev, "%s - stop bits = 1\n", __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, MOS7720_IER, 0x00);
|
|
write_mos_reg(serial, port_number, MOS7720_FCR, 0x00);
|
|
write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf);
|
|
|
|
/* Send the updated LCR value to the mos7720 */
|
|
write_mos_reg(serial, port_number, MOS7720_LCR,
|
|
mos7720_port->shadowLCR);
|
|
mos7720_port->shadowMCR = 0x0b;
|
|
write_mos_reg(serial, port_number, MOS7720_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, MOS7720_SP_CONTROL_REG,
|
|
0x01);
|
|
else
|
|
write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG,
|
|
0x02);
|
|
|
|
} else
|
|
mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
|
|
|
|
write_mos_reg(serial, port_number, MOS7720_MCR,
|
|
mos7720_port->shadowMCR);
|
|
|
|
/* Determine divisor based on baud rate */
|
|
baud = tty_get_baud_rate(tty);
|
|
if (!baud) {
|
|
/* pick a default, any default... */
|
|
dev_dbg(&port->dev, "Picked default baud...\n");
|
|
baud = 9600;
|
|
}
|
|
|
|
if (baud >= 230400) {
|
|
set_higher_rates(mos7720_port, baud);
|
|
/* Enable Interrupts */
|
|
write_mos_reg(serial, port_number, MOS7720_IER, 0x0c);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(&port->dev, "%s - baud rate = %d\n", __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, MOS7720_IER, 0x0c);
|
|
|
|
if (port->read_urb->status != -EINPROGRESS) {
|
|
status = usb_submit_urb(port->read_urb, GFP_KERNEL);
|
|
if (status)
|
|
dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 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) {
|
|
dev_dbg(&port->dev, "%s - port not opened\n", __func__);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(&port->dev, "setting termios - ASPIRE\n");
|
|
|
|
cflag = tty->termios.c_cflag;
|
|
|
|
dev_dbg(&port->dev, "%s - cflag %08x iflag %08x\n", __func__,
|
|
tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
|
|
|
|
dev_dbg(&port->dev, "%s - old cflag %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 */
|
|
change_port_settings(tty, mos7720_port, old_termios);
|
|
|
|
if (port->read_urb->status != -EINPROGRESS) {
|
|
status = usb_submit_urb(port->read_urb, GFP_KERNEL);
|
|
if (status)
|
|
dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", 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->port_number;
|
|
int count;
|
|
|
|
count = mos7720_chars_in_buffer(tty);
|
|
if (count == 0) {
|
|
read_mos_reg(port->serial, port_number, MOS7720_LSR, &data);
|
|
if ((data & (UART_LSR_TEMT | UART_LSR_THRE))
|
|
== (UART_LSR_TEMT | UART_LSR_THRE)) {
|
|
dev_dbg(&port->dev, "%s -- Empty\n", __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 ;
|
|
|
|
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 */
|
|
|
|
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 ;
|
|
|
|
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->port_number, MOS7720_MCR,
|
|
mos7720_port->shadowMCR);
|
|
|
|
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->port_number, MOS7720_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->minor;
|
|
tmp.port = mos7720_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;
|
|
}
|
|
|
|
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;
|
|
|
|
mos7720_port = usb_get_serial_port_data(port);
|
|
if (mos7720_port == NULL)
|
|
return -ENODEV;
|
|
|
|
switch (cmd) {
|
|
case TIOCSERGETLSR:
|
|
dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
|
|
return get_lsr_info(tty, mos7720_port,
|
|
(unsigned int __user *)arg);
|
|
|
|
/* FIXME: These should be using the mode methods */
|
|
case TIOCMBIS:
|
|
case TIOCMBIC:
|
|
dev_dbg(&port->dev, "%s TIOCMSET/TIOCMBIC/TIOCMSET\n", __func__);
|
|
return set_modem_info(mos7720_port, cmd,
|
|
(unsigned int __user *)arg);
|
|
|
|
case TIOCGSERIAL:
|
|
dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
|
|
return get_serial_info(mos7720_port,
|
|
(struct serial_struct __user *)arg);
|
|
}
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static int mos7720_startup(struct usb_serial *serial)
|
|
{
|
|
struct usb_device *dev;
|
|
char data;
|
|
u16 product;
|
|
int ret_val;
|
|
|
|
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;
|
|
}
|
|
|
|
/* setting configuration feature to one */
|
|
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
|
|
(__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
|
|
|
|
/* 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, MOS7720_LSR, &data);
|
|
dev_dbg(&dev->dev, "LSR:%x\n", data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mos7720_release(struct usb_serial *serial)
|
|
{
|
|
#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,
|
|
msecs_to_jiffies(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);
|
|
parport_del_port(mos_parport->pp);
|
|
|
|
kref_put(&mos_parport->ref_count, destroy_mos_parport);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static int mos7720_port_probe(struct usb_serial_port *port)
|
|
{
|
|
struct moschip_port *mos7720_port;
|
|
|
|
mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL);
|
|
if (!mos7720_port)
|
|
return -ENOMEM;
|
|
|
|
/* Initialize all port interrupt end point to port 0 int endpoint.
|
|
* Our device has only one interrupt endpoint common to all ports.
|
|
*/
|
|
port->interrupt_in_endpointAddress =
|
|
port->serial->port[0]->interrupt_in_endpointAddress;
|
|
mos7720_port->port = port;
|
|
|
|
usb_set_serial_port_data(port, mos7720_port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mos7720_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct moschip_port *mos7720_port;
|
|
|
|
mos7720_port = usb_get_serial_port_data(port);
|
|
kfree(mos7720_port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct usb_serial_driver moschip7720_2port_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "moschip7720",
|
|
},
|
|
.description = "Moschip 2 port adapter",
|
|
.id_table = 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,
|
|
.port_probe = mos7720_port_probe,
|
|
.port_remove = mos7720_port_remove,
|
|
.ioctl = mos7720_ioctl,
|
|
.tiocmget = mos7720_tiocmget,
|
|
.tiocmset = mos7720_tiocmset,
|
|
.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 struct usb_serial_driver * const serial_drivers[] = {
|
|
&moschip7720_2port_driver, NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|