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android_kernel_xiaomi_sm8350/drivers/usb/serial/io_edgeport.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

2893 lines
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/*
* Edgeport USB Serial Converter driver
*
* Copyright (C) 2000 Inside Out Networks, All rights reserved.
* Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Supports the following devices:
* Edgeport/4
* Edgeport/4t
* Edgeport/2
* Edgeport/4i
* Edgeport/2i
* Edgeport/421
* Edgeport/21
* Rapidport/4
* Edgeport/8
* Edgeport/2D8
* Edgeport/4D8
* Edgeport/8i
*
* For questions or problems with this driver, contact Inside Out
* Networks technical support, or Peter Berger <pberger@brimson.com>,
* or Al Borchers <alborchers@steinerpoint.com>.
*
*/
#include <linux/kernel.h>
#include <linux/jiffies.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/ioctl.h>
#include <linux/wait.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include "io_edgeport.h"
#include "io_ionsp.h" /* info for the iosp messages */
#include "io_16654.h" /* 16654 UART defines */
/*
* Version Information
*/
#define DRIVER_VERSION "v2.7"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com> and David Iacovelli"
#define DRIVER_DESC "Edgeport USB Serial Driver"
/* First, the latest boot code - for first generation edgeports */
#define IMAGE_ARRAY_NAME BootCodeImage_GEN1
#define IMAGE_VERSION_NAME BootCodeImageVersion_GEN1
#include "io_fw_boot.h" /* the bootloader firmware to download to a device, if it needs it */
/* for second generation edgeports */
#define IMAGE_ARRAY_NAME BootCodeImage_GEN2
#define IMAGE_VERSION_NAME BootCodeImageVersion_GEN2
#include "io_fw_boot2.h" /* the bootloader firmware to download to a device, if it needs it */
/* Then finally the main run-time operational code - for first generation edgeports */
#define IMAGE_ARRAY_NAME OperationalCodeImage_GEN1
#define IMAGE_VERSION_NAME OperationalCodeImageVersion_GEN1
#include "io_fw_down.h" /* Define array OperationalCodeImage[] */
/* for second generation edgeports */
#define IMAGE_ARRAY_NAME OperationalCodeImage_GEN2
#define IMAGE_VERSION_NAME OperationalCodeImageVersion_GEN2
#include "io_fw_down2.h" /* Define array OperationalCodeImage[] */
#define MAX_NAME_LEN 64
#define CHASE_TIMEOUT (5*HZ) /* 5 seconds */
#define OPEN_TIMEOUT (5*HZ) /* 5 seconds */
#define COMMAND_TIMEOUT (5*HZ) /* 5 seconds */
/* receive port state */
enum RXSTATE {
EXPECT_HDR1 = 0, /* Expect header byte 1 */
EXPECT_HDR2 = 1, /* Expect header byte 2 */
EXPECT_DATA = 2, /* Expect 'RxBytesRemaining' data */
EXPECT_HDR3 = 3, /* Expect header byte 3 (for status hdrs only) */
};
/* Transmit Fifo
* This Transmit queue is an extension of the edgeport Rx buffer.
* The maximum amount of data buffered in both the edgeport
* Rx buffer (maxTxCredits) and this buffer will never exceed maxTxCredits.
*/
struct TxFifo {
unsigned int head; /* index to head pointer (write) */
unsigned int tail; /* index to tail pointer (read) */
unsigned int count; /* Bytes in queue */
unsigned int size; /* Max size of queue (equal to Max number of TxCredits) */
unsigned char *fifo; /* allocated Buffer */
};
/* This structure holds all of the local port information */
struct edgeport_port {
__u16 txCredits; /* our current credits for this port */
__u16 maxTxCredits; /* the max size of the port */
struct TxFifo txfifo; /* transmit fifo -- size will be maxTxCredits */
struct urb *write_urb; /* write URB for this port */
char write_in_progress; /* TRUE while a write URB is outstanding */
spinlock_t ep_lock;
__u8 shadowLCR; /* last LCR value received */
__u8 shadowMCR; /* last MCR value received */
__u8 shadowMSR; /* last MSR value received */
__u8 shadowLSR; /* last LSR value received */
__u8 shadowXonChar; /* last value set as XON char in Edgeport */
__u8 shadowXoffChar; /* last value set as XOFF char in Edgeport */
__u8 validDataMask;
__u32 baudRate;
char open;
char openPending;
char commandPending;
char closePending;
char chaseResponsePending;
wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
wait_queue_head_t wait_open; /* for handling sleeping while waiting for open to finish */
wait_queue_head_t wait_command; /* for handling sleeping while waiting for command to finish */
wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
struct async_icount icount;
struct usb_serial_port *port; /* loop back to the owner of this object */
};
/* This structure holds all of the individual device information */
struct edgeport_serial {
char name[MAX_NAME_LEN+2]; /* string name of this device */
struct edge_manuf_descriptor manuf_descriptor; /* the manufacturer descriptor */
struct edge_boot_descriptor boot_descriptor; /* the boot firmware descriptor */
struct edgeport_product_info product_info; /* Product Info */
__u8 interrupt_in_endpoint; /* the interrupt endpoint handle */
unsigned char * interrupt_in_buffer; /* the buffer we use for the interrupt endpoint */
struct urb * interrupt_read_urb; /* our interrupt urb */
__u8 bulk_in_endpoint; /* the bulk in endpoint handle */
unsigned char * bulk_in_buffer; /* the buffer we use for the bulk in endpoint */
struct urb * read_urb; /* our bulk read urb */
int read_in_progress;
spinlock_t es_lock;
__u8 bulk_out_endpoint; /* the bulk out endpoint handle */
__s16 rxBytesAvail; /* the number of bytes that we need to read from this device */
enum RXSTATE rxState; /* the current state of the bulk receive processor */
__u8 rxHeader1; /* receive header byte 1 */
__u8 rxHeader2; /* receive header byte 2 */
__u8 rxHeader3; /* receive header byte 3 */
__u8 rxPort; /* the port that we are currently receiving data for */
__u8 rxStatusCode; /* the receive status code */
__u8 rxStatusParam; /* the receive status paramater */
__s16 rxBytesRemaining; /* the number of port bytes left to read */
struct usb_serial *serial; /* loop back to the owner of this object */
};
/* baud rate information */
struct divisor_table_entry {
__u32 BaudRate;
__u16 Divisor;
};
//
// Define table of divisors for Rev A EdgePort/4 hardware
// These assume a 3.6864MHz crystal, the standard /16, and
// MCR.7 = 0.
//
static const struct divisor_table_entry divisor_table[] = {
{ 50, 4608},
{ 75, 3072},
{ 110, 2095}, /* 2094.545455 => 230450 => .0217 % over */
{ 134, 1713}, /* 1713.011152 => 230398.5 => .00065% under */
{ 150, 1536},
{ 300, 768},
{ 600, 384},
{ 1200, 192},
{ 1800, 128},
{ 2400, 96},
{ 4800, 48},
{ 7200, 32},
{ 9600, 24},
{ 14400, 16},
{ 19200, 12},
{ 38400, 6},
{ 57600, 4},
{ 115200, 2},
{ 230400, 1},
};
/* local variables */
static int debug;
static int low_latency = 1; /* tty low latency flag, on by default */
static int CmdUrbs = 0; /* Number of outstanding Command Write Urbs */
/* local function prototypes */
/* function prototypes for all URB callbacks */
static void edge_interrupt_callback (struct urb *urb);
static void edge_bulk_in_callback (struct urb *urb);
static void edge_bulk_out_data_callback (struct urb *urb);
static void edge_bulk_out_cmd_callback (struct urb *urb);
/* function prototypes for the usbserial callbacks */
static int edge_open (struct usb_serial_port *port, struct file *filp);
static void edge_close (struct usb_serial_port *port, struct file *filp);
static int edge_write (struct usb_serial_port *port, const unsigned char *buf, int count);
static int edge_write_room (struct usb_serial_port *port);
static int edge_chars_in_buffer (struct usb_serial_port *port);
static void edge_throttle (struct usb_serial_port *port);
static void edge_unthrottle (struct usb_serial_port *port);
static void edge_set_termios (struct usb_serial_port *port, struct termios *old_termios);
static int edge_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
static void edge_break (struct usb_serial_port *port, int break_state);
static int edge_tiocmget (struct usb_serial_port *port, struct file *file);
static int edge_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
static int edge_startup (struct usb_serial *serial);
static void edge_shutdown (struct usb_serial *serial);
#include "io_tables.h" /* all of the devices that this driver supports */
static struct usb_driver io_driver = {
.name = "io_edgeport",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table_combined,
.no_dynamic_id = 1,
};
/* function prototypes for all of our local functions */
static void process_rcvd_data (struct edgeport_serial *edge_serial, unsigned char *buffer, __u16 bufferLength);
static void process_rcvd_status (struct edgeport_serial *edge_serial, __u8 byte2, __u8 byte3);
static void edge_tty_recv (struct device *dev, struct tty_struct *tty, unsigned char *data, int length);
static void handle_new_msr (struct edgeport_port *edge_port, __u8 newMsr);
static void handle_new_lsr (struct edgeport_port *edge_port, __u8 lsrData, __u8 lsr, __u8 data);
static int send_iosp_ext_cmd (struct edgeport_port *edge_port, __u8 command, __u8 param);
static int calc_baud_rate_divisor (int baud_rate, int *divisor);
static int send_cmd_write_baud_rate (struct edgeport_port *edge_port, int baudRate);
static void change_port_settings (struct edgeport_port *edge_port, struct termios *old_termios);
static int send_cmd_write_uart_register (struct edgeport_port *edge_port, __u8 regNum, __u8 regValue);
static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer, int writeLength);
static void send_more_port_data (struct edgeport_serial *edge_serial, struct edgeport_port *edge_port);
static int sram_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
static int rom_read (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
static int rom_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
static void get_manufacturing_desc (struct edgeport_serial *edge_serial);
static void get_boot_desc (struct edgeport_serial *edge_serial);
static void load_application_firmware (struct edgeport_serial *edge_serial);
static void unicode_to_ascii(char *string, int buflen, __le16 *unicode, int unicode_size);
// ************************************************************************
// ************************************************************************
// ************************************************************************
// ************************************************************************
/************************************************************************
* *
* update_edgeport_E2PROM() Compare current versions of *
* Boot ROM and Manufacture *
* Descriptors with versions *
* embedded in this driver *
* *
************************************************************************/
static void update_edgeport_E2PROM (struct edgeport_serial *edge_serial)
{
__u32 BootCurVer;
__u32 BootNewVer;
__u8 BootMajorVersion;
__u8 BootMinorVersion;
__le16 BootBuildNumber;
__u8 *BootImage;
__u32 BootSize;
struct edge_firmware_image_record *record;
unsigned char *firmware;
int response;
switch (edge_serial->product_info.iDownloadFile) {
case EDGE_DOWNLOAD_FILE_I930:
BootMajorVersion = BootCodeImageVersion_GEN1.MajorVersion;
BootMinorVersion = BootCodeImageVersion_GEN1.MinorVersion;
BootBuildNumber = cpu_to_le16(BootCodeImageVersion_GEN1.BuildNumber);
BootImage = &BootCodeImage_GEN1[0];
BootSize = sizeof( BootCodeImage_GEN1 );
break;
case EDGE_DOWNLOAD_FILE_80251:
BootMajorVersion = BootCodeImageVersion_GEN2.MajorVersion;
BootMinorVersion = BootCodeImageVersion_GEN2.MinorVersion;
BootBuildNumber = cpu_to_le16(BootCodeImageVersion_GEN2.BuildNumber);
BootImage = &BootCodeImage_GEN2[0];
BootSize = sizeof( BootCodeImage_GEN2 );
break;
default:
return;
}
// Check Boot Image Version
BootCurVer = (edge_serial->boot_descriptor.MajorVersion << 24) +
(edge_serial->boot_descriptor.MinorVersion << 16) +
le16_to_cpu(edge_serial->boot_descriptor.BuildNumber);
BootNewVer = (BootMajorVersion << 24) +
(BootMinorVersion << 16) +
le16_to_cpu(BootBuildNumber);
dbg("Current Boot Image version %d.%d.%d",
edge_serial->boot_descriptor.MajorVersion,
edge_serial->boot_descriptor.MinorVersion,
le16_to_cpu(edge_serial->boot_descriptor.BuildNumber));
if (BootNewVer > BootCurVer) {
dbg("**Update Boot Image from %d.%d.%d to %d.%d.%d",
edge_serial->boot_descriptor.MajorVersion,
edge_serial->boot_descriptor.MinorVersion,
le16_to_cpu(edge_serial->boot_descriptor.BuildNumber),
BootMajorVersion,
BootMinorVersion,
le16_to_cpu(BootBuildNumber));
dbg("Downloading new Boot Image");
firmware = BootImage;
for (;;) {
record = (struct edge_firmware_image_record *)firmware;
response = rom_write (edge_serial->serial, le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len), &record->Data[0]);
if (response < 0) {
dev_err(&edge_serial->serial->dev->dev, "rom_write failed (%x, %x, %d)\n", le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len));
break;
}
firmware += sizeof (struct edge_firmware_image_record) + le16_to_cpu(record->Len);
if (firmware >= &BootImage[BootSize]) {
break;
}
}
} else {
dbg("Boot Image -- already up to date");
}
}
/************************************************************************
* *
* Get string descriptor from device *
* *
************************************************************************/
static int get_string (struct usb_device *dev, int Id, char *string, int buflen)
{
struct usb_string_descriptor StringDesc;
struct usb_string_descriptor *pStringDesc;
dbg("%s - USB String ID = %d", __FUNCTION__, Id );
if (!usb_get_descriptor(dev, USB_DT_STRING, Id, &StringDesc, sizeof(StringDesc))) {
return 0;
}
pStringDesc = kmalloc (StringDesc.bLength, GFP_KERNEL);
if (!pStringDesc) {
return 0;
}
if (!usb_get_descriptor(dev, USB_DT_STRING, Id, pStringDesc, StringDesc.bLength )) {
kfree(pStringDesc);
return 0;
}
unicode_to_ascii(string, buflen, pStringDesc->wData, pStringDesc->bLength/2);
kfree(pStringDesc);
return strlen(string);
}
#if 0
/************************************************************************
*
* Get string descriptor from device
*
************************************************************************/
static int get_string_desc (struct usb_device *dev, int Id, struct usb_string_descriptor **pRetDesc)
{
struct usb_string_descriptor StringDesc;
struct usb_string_descriptor *pStringDesc;
dbg("%s - USB String ID = %d", __FUNCTION__, Id );
if (!usb_get_descriptor(dev, USB_DT_STRING, Id, &StringDesc, sizeof(StringDesc))) {
return 0;
}
pStringDesc = kmalloc (StringDesc.bLength, GFP_KERNEL);
if (!pStringDesc) {
return -1;
}
if (!usb_get_descriptor(dev, USB_DT_STRING, Id, pStringDesc, StringDesc.bLength )) {
kfree(pStringDesc);
return -1;
}
*pRetDesc = pStringDesc;
return 0;
}
#endif
static void get_product_info(struct edgeport_serial *edge_serial)
{
struct edgeport_product_info *product_info = &edge_serial->product_info;
memset (product_info, 0, sizeof(struct edgeport_product_info));
product_info->ProductId = (__u16)(le16_to_cpu(edge_serial->serial->dev->descriptor.idProduct) & ~ION_DEVICE_ID_80251_NETCHIP);
product_info->NumPorts = edge_serial->manuf_descriptor.NumPorts;
product_info->ProdInfoVer = 0;
product_info->RomSize = edge_serial->manuf_descriptor.RomSize;
product_info->RamSize = edge_serial->manuf_descriptor.RamSize;
product_info->CpuRev = edge_serial->manuf_descriptor.CpuRev;
product_info->BoardRev = edge_serial->manuf_descriptor.BoardRev;
product_info->BootMajorVersion = edge_serial->boot_descriptor.MajorVersion;
product_info->BootMinorVersion = edge_serial->boot_descriptor.MinorVersion;
product_info->BootBuildNumber = edge_serial->boot_descriptor.BuildNumber;
memcpy(product_info->ManufactureDescDate, edge_serial->manuf_descriptor.DescDate, sizeof(edge_serial->manuf_descriptor.DescDate));
// check if this is 2nd generation hardware
if (le16_to_cpu(edge_serial->serial->dev->descriptor.idProduct) & ION_DEVICE_ID_80251_NETCHIP) {
product_info->FirmwareMajorVersion = OperationalCodeImageVersion_GEN2.MajorVersion;
product_info->FirmwareMinorVersion = OperationalCodeImageVersion_GEN2.MinorVersion;
product_info->FirmwareBuildNumber = cpu_to_le16(OperationalCodeImageVersion_GEN2.BuildNumber);
product_info->iDownloadFile = EDGE_DOWNLOAD_FILE_80251;
} else {
product_info->FirmwareMajorVersion = OperationalCodeImageVersion_GEN1.MajorVersion;
product_info->FirmwareMinorVersion = OperationalCodeImageVersion_GEN1.MinorVersion;
product_info->FirmwareBuildNumber = cpu_to_le16(OperationalCodeImageVersion_GEN1.BuildNumber);
product_info->iDownloadFile = EDGE_DOWNLOAD_FILE_I930;
}
// Determine Product type and set appropriate flags
switch (DEVICE_ID_FROM_USB_PRODUCT_ID(product_info->ProductId)) {
case ION_DEVICE_ID_EDGEPORT_COMPATIBLE:
case ION_DEVICE_ID_EDGEPORT_4T:
case ION_DEVICE_ID_EDGEPORT_4:
case ION_DEVICE_ID_EDGEPORT_2:
case ION_DEVICE_ID_EDGEPORT_8_DUAL_CPU:
case ION_DEVICE_ID_EDGEPORT_8:
case ION_DEVICE_ID_EDGEPORT_421:
case ION_DEVICE_ID_EDGEPORT_21:
case ION_DEVICE_ID_EDGEPORT_2_DIN:
case ION_DEVICE_ID_EDGEPORT_4_DIN:
case ION_DEVICE_ID_EDGEPORT_16_DUAL_CPU:
product_info->IsRS232 = 1;
break;
case ION_DEVICE_ID_EDGEPORT_2I: // Edgeport/2 RS422/RS485
product_info->IsRS422 = 1;
product_info->IsRS485 = 1;
break;
case ION_DEVICE_ID_EDGEPORT_8I: // Edgeport/4 RS422
case ION_DEVICE_ID_EDGEPORT_4I: // Edgeport/4 RS422
product_info->IsRS422 = 1;
break;
}
// Dump Product Info structure
dbg("**Product Information:");
dbg(" ProductId %x", product_info->ProductId );
dbg(" NumPorts %d", product_info->NumPorts );
dbg(" ProdInfoVer %d", product_info->ProdInfoVer );
dbg(" IsServer %d", product_info->IsServer);
dbg(" IsRS232 %d", product_info->IsRS232 );
dbg(" IsRS422 %d", product_info->IsRS422 );
dbg(" IsRS485 %d", product_info->IsRS485 );
dbg(" RomSize %d", product_info->RomSize );
dbg(" RamSize %d", product_info->RamSize );
dbg(" CpuRev %x", product_info->CpuRev );
dbg(" BoardRev %x", product_info->BoardRev);
dbg(" BootMajorVersion %d.%d.%d", product_info->BootMajorVersion,
product_info->BootMinorVersion,
le16_to_cpu(product_info->BootBuildNumber));
dbg(" FirmwareMajorVersion %d.%d.%d", product_info->FirmwareMajorVersion,
product_info->FirmwareMinorVersion,
le16_to_cpu(product_info->FirmwareBuildNumber));
dbg(" ManufactureDescDate %d/%d/%d", product_info->ManufactureDescDate[0],
product_info->ManufactureDescDate[1],
product_info->ManufactureDescDate[2]+1900);
dbg(" iDownloadFile 0x%x", product_info->iDownloadFile);
}
/************************************************************************/
/************************************************************************/
/* U S B C A L L B A C K F U N C T I O N S */
/* U S B C A L L B A C K F U N C T I O N S */
/************************************************************************/
/************************************************************************/
/*****************************************************************************
* edge_interrupt_callback
* this is the callback function for when we have received data on the
* interrupt endpoint.
*****************************************************************************/
static void edge_interrupt_callback (struct urb *urb)
{
struct edgeport_serial *edge_serial = (struct edgeport_serial *)urb->context;
struct edgeport_port *edge_port;
struct usb_serial_port *port;
unsigned char *data = urb->transfer_buffer;
int length = urb->actual_length;
int bytes_avail;
int position;
int txCredits;
int portNumber;
int result;
dbg("%s", __FUNCTION__);
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
goto exit;
}
// process this interrupt-read even if there are no ports open
if (length) {
usb_serial_debug_data(debug, &edge_serial->serial->dev->dev, __FUNCTION__, length, data);
if (length > 1) {
bytes_avail = data[0] | (data[1] << 8);
if (bytes_avail) {
spin_lock(&edge_serial->es_lock);
edge_serial->rxBytesAvail += bytes_avail;
dbg("%s - bytes_avail=%d, rxBytesAvail=%d, read_in_progress=%d", __FUNCTION__, bytes_avail, edge_serial->rxBytesAvail, edge_serial->read_in_progress);
if (edge_serial->rxBytesAvail > 0 &&
!edge_serial->read_in_progress) {
dbg("%s - posting a read", __FUNCTION__);
edge_serial->read_in_progress = TRUE;
/* we have pending bytes on the bulk in pipe, send a request */
edge_serial->read_urb->dev = edge_serial->serial->dev;
result = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
if (result) {
dev_err(&edge_serial->serial->dev->dev, "%s - usb_submit_urb(read bulk) failed with result = %d\n", __FUNCTION__, result);
edge_serial->read_in_progress = FALSE;
}
}
spin_unlock(&edge_serial->es_lock);
}
}
/* grab the txcredits for the ports if available */
position = 2;
portNumber = 0;
while ((position < length) && (portNumber < edge_serial->serial->num_ports)) {
txCredits = data[position] | (data[position+1] << 8);
if (txCredits) {
port = edge_serial->serial->port[portNumber];
edge_port = usb_get_serial_port_data(port);
if (edge_port->open) {
spin_lock(&edge_port->ep_lock);
edge_port->txCredits += txCredits;
spin_unlock(&edge_port->ep_lock);
dbg("%s - txcredits for port%d = %d", __FUNCTION__, portNumber, edge_port->txCredits);
/* tell the tty driver that something has changed */
if (edge_port->port->tty)
tty_wakeup(edge_port->port->tty);
// Since we have more credit, check if more data can be sent
send_more_port_data(edge_serial, edge_port);
}
}
position += 2;
++portNumber;
}
}
exit:
result = usb_submit_urb (urb, GFP_ATOMIC);
if (result) {
dev_err(&urb->dev->dev, "%s - Error %d submitting control urb\n", __FUNCTION__, result);
}
}
/*****************************************************************************
* edge_bulk_in_callback
* this is the callback function for when we have received data on the
* bulk in endpoint.
*****************************************************************************/
static void edge_bulk_in_callback (struct urb *urb)
{
struct edgeport_serial *edge_serial = (struct edgeport_serial *)urb->context;
unsigned char *data = urb->transfer_buffer;
int status;
__u16 raw_data_length;
dbg("%s", __FUNCTION__);
if (urb->status) {
dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
edge_serial->read_in_progress = FALSE;
return;
}
if (urb->actual_length == 0) {
dbg("%s - read bulk callback with no data", __FUNCTION__);
edge_serial->read_in_progress = FALSE;
return;
}
raw_data_length = urb->actual_length;
usb_serial_debug_data(debug, &edge_serial->serial->dev->dev, __FUNCTION__, raw_data_length, data);
spin_lock(&edge_serial->es_lock);
/* decrement our rxBytes available by the number that we just got */
edge_serial->rxBytesAvail -= raw_data_length;
dbg("%s - Received = %d, rxBytesAvail %d", __FUNCTION__, raw_data_length, edge_serial->rxBytesAvail);
process_rcvd_data (edge_serial, data, urb->actual_length);
/* check to see if there's any more data for us to read */
if (edge_serial->rxBytesAvail > 0) {
dbg("%s - posting a read", __FUNCTION__);
edge_serial->read_urb->dev = edge_serial->serial->dev;
status = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
if (status) {
dev_err(&urb->dev->dev, "%s - usb_submit_urb(read bulk) failed, status = %d\n", __FUNCTION__, status);
edge_serial->read_in_progress = FALSE;
}
} else {
edge_serial->read_in_progress = FALSE;
}
spin_unlock(&edge_serial->es_lock);
}
/*****************************************************************************
* edge_bulk_out_data_callback
* this is the callback function for when we have finished sending serial data
* on the bulk out endpoint.
*****************************************************************************/
static void edge_bulk_out_data_callback (struct urb *urb)
{
struct edgeport_port *edge_port = (struct edgeport_port *)urb->context;
struct tty_struct *tty;
dbg("%s", __FUNCTION__);
if (urb->status) {
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
}
tty = edge_port->port->tty;
if (tty && edge_port->open) {
/* let the tty driver wakeup if it has a special write_wakeup function */
tty_wakeup(tty);
}
// Release the Write URB
edge_port->write_in_progress = FALSE;
// Check if more data needs to be sent
send_more_port_data((struct edgeport_serial *)(usb_get_serial_data(edge_port->port->serial)), edge_port);
}
/*****************************************************************************
* BulkOutCmdCallback
* this is the callback function for when we have finished sending a command
* on the bulk out endpoint.
*****************************************************************************/
static void edge_bulk_out_cmd_callback (struct urb *urb)
{
struct edgeport_port *edge_port = (struct edgeport_port *)urb->context;
struct tty_struct *tty;
int status = urb->status;
dbg("%s", __FUNCTION__);
CmdUrbs--;
dbg("%s - FREE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);
/* clean up the transfer buffer */
kfree(urb->transfer_buffer);
/* Free the command urb */
usb_free_urb (urb);
if (status) {
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, status);
return;
}
/* Get pointer to tty */
tty = edge_port->port->tty;
/* tell the tty driver that something has changed */
if (tty && edge_port->open)
tty_wakeup(tty);
/* we have completed the command */
edge_port->commandPending = FALSE;
wake_up(&edge_port->wait_command);
}
/*****************************************************************************
* Driver tty interface functions
*****************************************************************************/
/*****************************************************************************
* SerialOpen
* this function is called by the tty driver when a port is opened
* If successful, we return 0
* Otherwise we return a negative error number.
*****************************************************************************/
static int edge_open (struct usb_serial_port *port, struct file * filp)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct usb_serial *serial;
struct edgeport_serial *edge_serial;
int response;
dbg("%s - port %d", __FUNCTION__, port->number);
if (edge_port == NULL)
return -ENODEV;
if (port->tty)
port->tty->low_latency = low_latency;
/* see if we've set up our endpoint info yet (can't set it up in edge_startup
as the structures were not set up at that time.) */
serial = port->serial;
edge_serial = usb_get_serial_data(serial);
if (edge_serial == NULL) {
return -ENODEV;
}
if (edge_serial->interrupt_in_buffer == NULL) {
struct usb_serial_port *port0 = serial->port[0];
/* not set up yet, so do it now */
edge_serial->interrupt_in_buffer = port0->interrupt_in_buffer;
edge_serial->interrupt_in_endpoint = port0->interrupt_in_endpointAddress;
edge_serial->interrupt_read_urb = port0->interrupt_in_urb;
edge_serial->bulk_in_buffer = port0->bulk_in_buffer;
edge_serial->bulk_in_endpoint = port0->bulk_in_endpointAddress;
edge_serial->read_urb = port0->read_urb;
edge_serial->bulk_out_endpoint = port0->bulk_out_endpointAddress;
/* set up our interrupt urb */
usb_fill_int_urb(edge_serial->interrupt_read_urb,
serial->dev,
usb_rcvintpipe(serial->dev,
port0->interrupt_in_endpointAddress),
port0->interrupt_in_buffer,
edge_serial->interrupt_read_urb->transfer_buffer_length,
edge_interrupt_callback, edge_serial,
edge_serial->interrupt_read_urb->interval);
/* set up our bulk in urb */
usb_fill_bulk_urb(edge_serial->read_urb, serial->dev,
usb_rcvbulkpipe(serial->dev,
port0->bulk_in_endpointAddress),
port0->bulk_in_buffer,
edge_serial->read_urb->transfer_buffer_length,
edge_bulk_in_callback, edge_serial);
edge_serial->read_in_progress = FALSE;
/* start interrupt read for this edgeport
* this interrupt will continue as long as the edgeport is connected */
response = usb_submit_urb (edge_serial->interrupt_read_urb, GFP_KERNEL);
if (response) {
dev_err(&port->dev, "%s - Error %d submitting control urb\n", __FUNCTION__, response);
}
}
/* initialize our wait queues */
init_waitqueue_head(&edge_port->wait_open);
init_waitqueue_head(&edge_port->wait_chase);
init_waitqueue_head(&edge_port->delta_msr_wait);
init_waitqueue_head(&edge_port->wait_command);
/* initialize our icount structure */
memset (&(edge_port->icount), 0x00, sizeof(edge_port->icount));
/* initialize our port settings */
edge_port->txCredits = 0; /* Can't send any data yet */
edge_port->shadowMCR = MCR_MASTER_IE; /* Must always set this bit to enable ints! */
edge_port->chaseResponsePending = FALSE;
/* send a open port command */
edge_port->openPending = TRUE;
edge_port->open = FALSE;
response = send_iosp_ext_cmd (edge_port, IOSP_CMD_OPEN_PORT, 0);
if (response < 0) {
dev_err(&port->dev, "%s - error sending open port command\n", __FUNCTION__);
edge_port->openPending = FALSE;
return -ENODEV;
}
/* now wait for the port to be completely opened */
wait_event_timeout(edge_port->wait_open, (edge_port->openPending != TRUE), OPEN_TIMEOUT);
if (edge_port->open == FALSE) {
/* open timed out */
dbg("%s - open timedout", __FUNCTION__);
edge_port->openPending = FALSE;
return -ENODEV;
}
/* create the txfifo */
edge_port->txfifo.head = 0;
edge_port->txfifo.tail = 0;
edge_port->txfifo.count = 0;
edge_port->txfifo.size = edge_port->maxTxCredits;
edge_port->txfifo.fifo = kmalloc (edge_port->maxTxCredits, GFP_KERNEL);
if (!edge_port->txfifo.fifo) {
dbg("%s - no memory", __FUNCTION__);
edge_close (port, filp);
return -ENOMEM;
}
/* Allocate a URB for the write */
edge_port->write_urb = usb_alloc_urb (0, GFP_KERNEL);
edge_port->write_in_progress = FALSE;
if (!edge_port->write_urb) {
dbg("%s - no memory", __FUNCTION__);
edge_close (port, filp);
return -ENOMEM;
}
dbg("%s(%d) - Initialize TX fifo to %d bytes", __FUNCTION__, port->number, edge_port->maxTxCredits);
dbg("%s exited", __FUNCTION__);
return 0;
}
/************************************************************************
*
* block_until_chase_response
*
* This function will block the close until one of the following:
* 1. Response to our Chase comes from Edgeport
* 2. A timout of 10 seconds without activity has expired
* (1K of Edgeport data @ 2400 baud ==> 4 sec to empty)
*
************************************************************************/
static void block_until_chase_response(struct edgeport_port *edge_port)
{
DEFINE_WAIT(wait);
__u16 lastCredits;
int timeout = 1*HZ;
int loop = 10;
while (1) {
// Save Last credits
lastCredits = edge_port->txCredits;
// Did we get our Chase response
if (edge_port->chaseResponsePending == FALSE) {
dbg("%s - Got Chase Response", __FUNCTION__);
// did we get all of our credit back?
if (edge_port->txCredits == edge_port->maxTxCredits ) {
dbg("%s - Got all credits", __FUNCTION__);
return;
}
}
// Block the thread for a while
prepare_to_wait(&edge_port->wait_chase, &wait, TASK_UNINTERRUPTIBLE);
schedule_timeout(timeout);
finish_wait(&edge_port->wait_chase, &wait);
if (lastCredits == edge_port->txCredits) {
// No activity.. count down.
loop--;
if (loop == 0) {
edge_port->chaseResponsePending = FALSE;
dbg("%s - Chase TIMEOUT", __FUNCTION__);
return;
}
} else {
// Reset timout value back to 10 seconds
dbg("%s - Last %d, Current %d", __FUNCTION__, lastCredits, edge_port->txCredits);
loop = 10;
}
}
}
/************************************************************************
*
* block_until_tx_empty
*
* This function will block the close until one of the following:
* 1. TX count are 0
* 2. The edgeport has stopped
* 3. A timout of 3 seconds without activity has expired
*
************************************************************************/
static void block_until_tx_empty (struct edgeport_port *edge_port)
{
DEFINE_WAIT(wait);
struct TxFifo *fifo = &edge_port->txfifo;
__u32 lastCount;
int timeout = HZ/10;
int loop = 30;
while (1) {
// Save Last count
lastCount = fifo->count;
// Is the Edgeport Buffer empty?
if (lastCount == 0) {
dbg("%s - TX Buffer Empty", __FUNCTION__);
return;
}
// Block the thread for a while
prepare_to_wait (&edge_port->wait_chase, &wait, TASK_UNINTERRUPTIBLE);
schedule_timeout(timeout);
finish_wait(&edge_port->wait_chase, &wait);
dbg("%s wait", __FUNCTION__);
if (lastCount == fifo->count) {
// No activity.. count down.
loop--;
if (loop == 0) {
dbg("%s - TIMEOUT", __FUNCTION__);
return;
}
} else {
// Reset timout value back to seconds
loop = 30;
}
}
}
/*****************************************************************************
* edge_close
* this function is called by the tty driver when a port is closed
*****************************************************************************/
static void edge_close (struct usb_serial_port *port, struct file * filp)
{
struct edgeport_serial *edge_serial;
struct edgeport_port *edge_port;
int status;
dbg("%s - port %d", __FUNCTION__, port->number);
edge_serial = usb_get_serial_data(port->serial);
edge_port = usb_get_serial_port_data(port);
if ((edge_serial == NULL) || (edge_port == NULL))
return;
// block until tx is empty
block_until_tx_empty(edge_port);
edge_port->closePending = TRUE;
/* flush and chase */
edge_port->chaseResponsePending = TRUE;
dbg("%s - Sending IOSP_CMD_CHASE_PORT", __FUNCTION__);
status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CHASE_PORT, 0);
if (status == 0) {
// block until chase finished
block_until_chase_response(edge_port);
} else {
edge_port->chaseResponsePending = FALSE;
}
/* close the port */
dbg("%s - Sending IOSP_CMD_CLOSE_PORT", __FUNCTION__);
send_iosp_ext_cmd (edge_port, IOSP_CMD_CLOSE_PORT, 0);
//port->close = TRUE;
edge_port->closePending = FALSE;
edge_port->open = FALSE;
edge_port->openPending = FALSE;
if (edge_port->write_urb) {
usb_kill_urb(edge_port->write_urb);
}
if (edge_port->write_urb) {
/* if this urb had a transfer buffer already (old transfer) free it */
kfree(edge_port->write_urb->transfer_buffer);
usb_free_urb(edge_port->write_urb);
edge_port->write_urb = NULL;
}
kfree(edge_port->txfifo.fifo);
edge_port->txfifo.fifo = NULL;
dbg("%s exited", __FUNCTION__);
}
/*****************************************************************************
* SerialWrite
* this function is called by the tty driver when data should be written to
* the port.
* If successful, we return the number of bytes written, otherwise we return
* a negative error number.
*****************************************************************************/
static int edge_write (struct usb_serial_port *port, const unsigned char *data, int count)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct TxFifo *fifo;
int copySize;
int bytesleft;
int firsthalf;
int secondhalf;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
if (edge_port == NULL)
return -ENODEV;
// get a pointer to the Tx fifo
fifo = &edge_port->txfifo;
spin_lock_irqsave(&edge_port->ep_lock, flags);
// calculate number of bytes to put in fifo
copySize = min ((unsigned int)count, (edge_port->txCredits - fifo->count));
dbg("%s(%d) of %d byte(s) Fifo room %d -- will copy %d bytes", __FUNCTION__,
port->number, count, edge_port->txCredits - fifo->count, copySize);
/* catch writes of 0 bytes which the tty driver likes to give us, and when txCredits is empty */
if (copySize == 0) {
dbg("%s - copySize = Zero", __FUNCTION__);
goto finish_write;
}
// queue the data
// since we can never overflow the buffer we do not have to check for full condition
// the copy is done is two parts -- first fill to the end of the buffer
// then copy the reset from the start of the buffer
bytesleft = fifo->size - fifo->head;
firsthalf = min (bytesleft, copySize);
dbg("%s - copy %d bytes of %d into fifo ", __FUNCTION__, firsthalf, bytesleft);
/* now copy our data */
memcpy(&fifo->fifo[fifo->head], data, firsthalf);
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, firsthalf, &fifo->fifo[fifo->head]);
// update the index and size
fifo->head += firsthalf;
fifo->count += firsthalf;
// wrap the index
if (fifo->head == fifo->size) {
fifo->head = 0;
}
secondhalf = copySize-firsthalf;
if (secondhalf) {
dbg("%s - copy rest of data %d", __FUNCTION__, secondhalf);
memcpy(&fifo->fifo[fifo->head], &data[firsthalf], secondhalf);
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, secondhalf, &fifo->fifo[fifo->head]);
// update the index and size
fifo->count += secondhalf;
fifo->head += secondhalf;
// No need to check for wrap since we can not get to end of fifo in this part
}
finish_write:
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
send_more_port_data((struct edgeport_serial *)usb_get_serial_data(port->serial), edge_port);
dbg("%s wrote %d byte(s) TxCredits %d, Fifo %d", __FUNCTION__, copySize, edge_port->txCredits, fifo->count);
return copySize;
}
/************************************************************************
*
* send_more_port_data()
*
* This routine attempts to write additional UART transmit data
* to a port over the USB bulk pipe. It is called (1) when new
* data has been written to a port's TxBuffer from higher layers
* (2) when the peripheral sends us additional TxCredits indicating
* that it can accept more Tx data for a given port; and (3) when
* a bulk write completes successfully and we want to see if we
* can transmit more.
*
************************************************************************/
static void send_more_port_data(struct edgeport_serial *edge_serial, struct edgeport_port *edge_port)
{
struct TxFifo *fifo = &edge_port->txfifo;
struct urb *urb;
unsigned char *buffer;
int status;
int count;
int bytesleft;
int firsthalf;
int secondhalf;
unsigned long flags;
dbg("%s(%d)", __FUNCTION__, edge_port->port->number);
spin_lock_irqsave(&edge_port->ep_lock, flags);
if (edge_port->write_in_progress ||
!edge_port->open ||
(fifo->count == 0)) {
dbg("%s(%d) EXIT - fifo %d, PendingWrite = %d", __FUNCTION__, edge_port->port->number, fifo->count, edge_port->write_in_progress);
goto exit_send;
}
// since the amount of data in the fifo will always fit into the
// edgeport buffer we do not need to check the write length
// Do we have enough credits for this port to make it worthwhile
// to bother queueing a write. If it's too small, say a few bytes,
// it's better to wait for more credits so we can do a larger
// write.
if (edge_port->txCredits < EDGE_FW_GET_TX_CREDITS_SEND_THRESHOLD(edge_port->maxTxCredits,EDGE_FW_BULK_MAX_PACKET_SIZE)) {
dbg("%s(%d) Not enough credit - fifo %d TxCredit %d", __FUNCTION__, edge_port->port->number, fifo->count, edge_port->txCredits );
goto exit_send;
}
// lock this write
edge_port->write_in_progress = TRUE;
// get a pointer to the write_urb
urb = edge_port->write_urb;
/* make sure transfer buffer is freed */
kfree(urb->transfer_buffer);
urb->transfer_buffer = NULL;
/* build the data header for the buffer and port that we are about to send out */
count = fifo->count;
buffer = kmalloc (count+2, GFP_ATOMIC);
if (buffer == NULL) {
dev_err(&edge_port->port->dev, "%s - no more kernel memory...\n", __FUNCTION__);
edge_port->write_in_progress = FALSE;
goto exit_send;
}
buffer[0] = IOSP_BUILD_DATA_HDR1 (edge_port->port->number - edge_port->port->serial->minor, count);
buffer[1] = IOSP_BUILD_DATA_HDR2 (edge_port->port->number - edge_port->port->serial->minor, count);
/* now copy our data */
bytesleft = fifo->size - fifo->tail;
firsthalf = min (bytesleft, count);
memcpy(&buffer[2], &fifo->fifo[fifo->tail], firsthalf);
fifo->tail += firsthalf;
fifo->count -= firsthalf;
if (fifo->tail == fifo->size) {
fifo->tail = 0;
}
secondhalf = count-firsthalf;
if (secondhalf) {
memcpy(&buffer[2+firsthalf], &fifo->fifo[fifo->tail], secondhalf);
fifo->tail += secondhalf;
fifo->count -= secondhalf;
}
if (count)
usb_serial_debug_data(debug, &edge_port->port->dev, __FUNCTION__, count, &buffer[2]);
/* fill up the urb with all of our data and submit it */
usb_fill_bulk_urb (urb, edge_serial->serial->dev,
usb_sndbulkpipe(edge_serial->serial->dev, edge_serial->bulk_out_endpoint),
buffer, count+2, edge_bulk_out_data_callback, edge_port);
/* decrement the number of credits we have by the number we just sent */
edge_port->txCredits -= count;
edge_port->icount.tx += count;
urb->dev = edge_serial->serial->dev;
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
/* something went wrong */
dev_err(&edge_port->port->dev, "%s - usb_submit_urb(write bulk) failed, status = %d, data lost\n", __FUNCTION__, status);
edge_port->write_in_progress = FALSE;
/* revert the credits as something bad happened. */
edge_port->txCredits += count;
edge_port->icount.tx -= count;
}
dbg("%s wrote %d byte(s) TxCredit %d, Fifo %d", __FUNCTION__, count, edge_port->txCredits, fifo->count);
exit_send:
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
}
/*****************************************************************************
* edge_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
* (the txCredits),
* Otherwise we return a negative error number.
*****************************************************************************/
static int edge_write_room (struct usb_serial_port *port)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
int room;
unsigned long flags;
dbg("%s", __FUNCTION__);
if (edge_port == NULL)
return -ENODEV;
if (edge_port->closePending == TRUE)
return -ENODEV;
dbg("%s - port %d", __FUNCTION__, port->number);
if (!edge_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return -EINVAL;
}
// total of both buffers is still txCredit
spin_lock_irqsave(&edge_port->ep_lock, flags);
room = edge_port->txCredits - edge_port->txfifo.count;
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
dbg("%s - returns %d", __FUNCTION__, room);
return room;
}
/*****************************************************************************
* edge_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 edge_chars_in_buffer (struct usb_serial_port *port)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
int num_chars;
unsigned long flags;
dbg("%s", __FUNCTION__);
if (edge_port == NULL)
return -ENODEV;
if (edge_port->closePending == TRUE)
return -ENODEV;
if (!edge_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return -EINVAL;
}
spin_lock_irqsave(&edge_port->ep_lock, flags);
num_chars = edge_port->maxTxCredits - edge_port->txCredits + edge_port->txfifo.count;
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
if (num_chars) {
dbg("%s(port %d) - returns %d", __FUNCTION__, port->number, num_chars);
}
return num_chars;
}
/*****************************************************************************
* SerialThrottle
* this function is called by the tty driver when it wants to stop the data
* being read from the port.
*****************************************************************************/
static void edge_throttle (struct usb_serial_port *port)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct tty_struct *tty;
int status;
dbg("%s - port %d", __FUNCTION__, port->number);
if (edge_port == NULL)
return;
if (!edge_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return;
}
tty = port->tty;
if (!tty) {
dbg ("%s - no tty available", __FUNCTION__);
return;
}
/* if we are implementing XON/XOFF, send the stop character */
if (I_IXOFF(tty)) {
unsigned char stop_char = STOP_CHAR(tty);
status = edge_write (port, &stop_char, 1);
if (status <= 0) {
return;
}
}
/* if we are implementing RTS/CTS, toggle that line */
if (tty->termios->c_cflag & CRTSCTS) {
edge_port->shadowMCR &= ~MCR_RTS;
status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
if (status != 0) {
return;
}
}
return;
}
/*****************************************************************************
* edge_unthrottle
* this function is called by the tty driver when it wants to resume the data
* being read from the port (called after SerialThrottle is called)
*****************************************************************************/
static void edge_unthrottle (struct usb_serial_port *port)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct tty_struct *tty;
int status;
dbg("%s - port %d", __FUNCTION__, port->number);
if (edge_port == NULL)
return;
if (!edge_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return;
}
tty = port->tty;
if (!tty) {
dbg ("%s - no tty available", __FUNCTION__);
return;
}
/* if we are implementing XON/XOFF, send the start character */
if (I_IXOFF(tty)) {
unsigned char start_char = START_CHAR(tty);
status = edge_write (port, &start_char, 1);
if (status <= 0) {
return;
}
}
/* if we are implementing RTS/CTS, toggle that line */
if (tty->termios->c_cflag & CRTSCTS) {
edge_port->shadowMCR |= MCR_RTS;
status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
if (status != 0) {
return;
}
}
return;
}
/*****************************************************************************
* SerialSetTermios
* this function is called by the tty driver when it wants to change the termios structure
*****************************************************************************/
static void edge_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct tty_struct *tty = port->tty;
unsigned int cflag;
if (!port->tty || !port->tty->termios) {
dbg ("%s - no tty or termios", __FUNCTION__);
return;
}
cflag = tty->termios->c_cflag;
/* check that they really want us to change something */
if (old_termios) {
if (cflag == old_termios->c_cflag &&
tty->termios->c_iflag == old_termios->c_iflag) {
dbg("%s - nothing to change", __FUNCTION__);
return;
}
}
dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
tty->termios->c_cflag, tty->termios->c_iflag);
if (old_termios) {
dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
old_termios->c_cflag, old_termios->c_iflag);
}
dbg("%s - port %d", __FUNCTION__, port->number);
if (edge_port == NULL)
return;
if (!edge_port->open) {
dbg("%s - port not opened", __FUNCTION__);
return;
}
/* change the port settings to the new ones specified */
change_port_settings (edge_port, old_termios);
return;
}
/*****************************************************************************
* 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 edgeport_port *edge_port, unsigned int __user *value)
{
unsigned int result = 0;
unsigned long flags;
spin_lock_irqsave(&edge_port->ep_lock, flags);
if (edge_port->maxTxCredits == edge_port->txCredits &&
edge_port->txfifo.count == 0) {
dbg("%s -- Empty", __FUNCTION__);
result = TIOCSER_TEMT;
}
spin_unlock_irqrestore(&edge_port->ep_lock, flags);
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
return 0;
}
static int get_number_bytes_avail(struct edgeport_port *edge_port, unsigned int __user *value)
{
unsigned int result = 0;
struct tty_struct *tty = edge_port->port->tty;
if (!tty)
return -ENOIOCTLCMD;
result = tty->read_cnt;
dbg("%s(%d) = %d", __FUNCTION__, edge_port->port->number, result);
if (copy_to_user(value, &result, sizeof(int)))
return -EFAULT;
//return 0;
return -ENOIOCTLCMD;
}
static int edge_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
unsigned int mcr;
dbg("%s - port %d", __FUNCTION__, port->number);
mcr = edge_port->shadowMCR;
if (set & TIOCM_RTS)
mcr |= MCR_RTS;
if (set & TIOCM_DTR)
mcr |= MCR_DTR;
if (set & TIOCM_LOOP)
mcr |= MCR_LOOPBACK;
if (clear & TIOCM_RTS)
mcr &= ~MCR_RTS;
if (clear & TIOCM_DTR)
mcr &= ~MCR_DTR;
if (clear & TIOCM_LOOP)
mcr &= ~MCR_LOOPBACK;
edge_port->shadowMCR = mcr;
send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
return 0;
}
static int edge_tiocmget(struct usb_serial_port *port, struct file *file)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
unsigned int result = 0;
unsigned int msr;
unsigned int mcr;
dbg("%s - port %d", __FUNCTION__, port->number);
msr = edge_port->shadowMSR;
mcr = edge_port->shadowMCR;
result = ((mcr & MCR_DTR) ? TIOCM_DTR: 0) /* 0x002 */
| ((mcr & MCR_RTS) ? TIOCM_RTS: 0) /* 0x004 */
| ((msr & EDGEPORT_MSR_CTS) ? TIOCM_CTS: 0) /* 0x020 */
| ((msr & EDGEPORT_MSR_CD) ? TIOCM_CAR: 0) /* 0x040 */
| ((msr & EDGEPORT_MSR_RI) ? TIOCM_RI: 0) /* 0x080 */
| ((msr & EDGEPORT_MSR_DSR) ? TIOCM_DSR: 0); /* 0x100 */
dbg("%s -- %x", __FUNCTION__, result);
return result;
}
static int get_serial_info(struct edgeport_port *edge_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 = edge_port->port->serial->minor;
tmp.port = edge_port->port->number;
tmp.irq = 0;
tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
tmp.xmit_fifo_size = edge_port->maxTxCredits;
tmp.baud_base = 9600;
tmp.close_delay = 5*HZ;
tmp.closing_wait = 30*HZ;
// tmp.custom_divisor = state->custom_divisor;
// tmp.hub6 = state->hub6;
// tmp.io_type = state->io_type;
if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return 0;
}
/*****************************************************************************
* SerialIoctl
* this function handles any ioctl calls to the driver
*****************************************************************************/
static int edge_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
{
DEFINE_WAIT(wait);
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct async_icount cnow;
struct async_icount cprev;
struct serial_icounter_struct icount;
dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
switch (cmd) {
// return number of bytes available
case TIOCINQ:
dbg("%s (%d) TIOCINQ", __FUNCTION__, port->number);
return get_number_bytes_avail(edge_port, (unsigned int __user *) arg);
break;
case TIOCSERGETLSR:
dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
return get_lsr_info(edge_port, (unsigned int __user *) arg);
return 0;
case TIOCGSERIAL:
dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
return get_serial_info(edge_port, (struct serial_struct __user *) arg);
case TIOCSSERIAL:
dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
break;
case TIOCMIWAIT:
dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
cprev = edge_port->icount;
while (1) {
prepare_to_wait(&edge_port->delta_msr_wait, &wait, TASK_INTERRUPTIBLE);
schedule();
finish_wait(&edge_port->delta_msr_wait, &wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
cnow = edge_port->icount;
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
return -EIO; /* no change => error */
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
return 0;
}
cprev = cnow;
}
/* NOTREACHED */
break;
case TIOCGICOUNT:
cnow = edge_port->icount;
memset(&icount, 0, sizeof(icount));
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__, port->number, icount.rx, icount.tx );
if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
return -EFAULT;
return 0;
}
return -ENOIOCTLCMD;
}
/*****************************************************************************
* SerialBreak
* this function sends a break to the port
*****************************************************************************/
static void edge_break (struct usb_serial_port *port, int break_state)
{
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
int status;
/* flush and chase */
edge_port->chaseResponsePending = TRUE;
dbg("%s - Sending IOSP_CMD_CHASE_PORT", __FUNCTION__);
status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CHASE_PORT, 0);
if (status == 0) {
// block until chase finished
block_until_chase_response(edge_port);
} else {
edge_port->chaseResponsePending = FALSE;
}
if (break_state == -1) {
dbg("%s - Sending IOSP_CMD_SET_BREAK", __FUNCTION__);
status = send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_BREAK, 0);
} else {
dbg("%s - Sending IOSP_CMD_CLEAR_BREAK", __FUNCTION__);
status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CLEAR_BREAK, 0);
}
if (status) {
dbg("%s - error sending break set/clear command.", __FUNCTION__);
}
return;
}
/*****************************************************************************
* process_rcvd_data
* this function handles the data received on the bulk in pipe.
*****************************************************************************/
static void process_rcvd_data (struct edgeport_serial *edge_serial, unsigned char * buffer, __u16 bufferLength)
{
struct usb_serial_port *port;
struct edgeport_port *edge_port;
struct tty_struct *tty;
__u16 lastBufferLength;
__u16 rxLen;
dbg("%s", __FUNCTION__);
lastBufferLength = bufferLength + 1;
while (bufferLength > 0) {
/* failsafe incase we get a message that we don't understand */
if (lastBufferLength == bufferLength) {
dbg("%s - stuck in loop, exiting it.", __FUNCTION__);
break;
}
lastBufferLength = bufferLength;
switch (edge_serial->rxState) {
case EXPECT_HDR1:
edge_serial->rxHeader1 = *buffer;
++buffer;
--bufferLength;
if (bufferLength == 0) {
edge_serial->rxState = EXPECT_HDR2;
break;
}
/* otherwise, drop on through */
case EXPECT_HDR2:
edge_serial->rxHeader2 = *buffer;
++buffer;
--bufferLength;
dbg("%s - Hdr1=%02X Hdr2=%02X", __FUNCTION__, edge_serial->rxHeader1, edge_serial->rxHeader2);
// Process depending on whether this header is
// data or status
if (IS_CMD_STAT_HDR(edge_serial->rxHeader1)) {
// Decode this status header and goto EXPECT_HDR1 (if we
// can process the status with only 2 bytes), or goto
// EXPECT_HDR3 to get the third byte.
edge_serial->rxPort = IOSP_GET_HDR_PORT(edge_serial->rxHeader1);
edge_serial->rxStatusCode = IOSP_GET_STATUS_CODE(edge_serial->rxHeader1);
if (!IOSP_STATUS_IS_2BYTE(edge_serial->rxStatusCode)) {
// This status needs additional bytes. Save what we have
// and then wait for more data.
edge_serial->rxStatusParam = edge_serial->rxHeader2;
edge_serial->rxState = EXPECT_HDR3;
break;
}
// We have all the header bytes, process the status now
process_rcvd_status (edge_serial, edge_serial->rxHeader2, 0);
edge_serial->rxState = EXPECT_HDR1;
break;
} else {
edge_serial->rxPort = IOSP_GET_HDR_PORT(edge_serial->rxHeader1);
edge_serial->rxBytesRemaining = IOSP_GET_HDR_DATA_LEN(edge_serial->rxHeader1, edge_serial->rxHeader2);
dbg("%s - Data for Port %u Len %u", __FUNCTION__, edge_serial->rxPort, edge_serial->rxBytesRemaining);
//ASSERT( DevExt->RxPort < DevExt->NumPorts );
//ASSERT( DevExt->RxBytesRemaining < IOSP_MAX_DATA_LENGTH );
if (bufferLength == 0 ) {
edge_serial->rxState = EXPECT_DATA;
break;
}
// Else, drop through
}
case EXPECT_DATA: // Expect data
if (bufferLength < edge_serial->rxBytesRemaining) {
rxLen = bufferLength;
edge_serial->rxState = EXPECT_DATA; // Expect data to start next buffer
} else {
// BufLen >= RxBytesRemaining
rxLen = edge_serial->rxBytesRemaining;
edge_serial->rxState = EXPECT_HDR1; // Start another header next time
}
bufferLength -= rxLen;
edge_serial->rxBytesRemaining -= rxLen;
/* spit this data back into the tty driver if this port is open */
if (rxLen) {
port = edge_serial->serial->port[edge_serial->rxPort];
edge_port = usb_get_serial_port_data(port);
if (edge_port->open) {
tty = edge_port->port->tty;
if (tty) {
dbg("%s - Sending %d bytes to TTY for port %d", __FUNCTION__, rxLen, edge_serial->rxPort);
edge_tty_recv(&edge_serial->serial->dev->dev, tty, buffer, rxLen);
}
edge_port->icount.rx += rxLen;
}
buffer += rxLen;
}
break;
case EXPECT_HDR3: // Expect 3rd byte of status header
edge_serial->rxHeader3 = *buffer;
++buffer;
--bufferLength;
// We have all the header bytes, process the status now
process_rcvd_status (edge_serial, edge_serial->rxStatusParam, edge_serial->rxHeader3);
edge_serial->rxState = EXPECT_HDR1;
break;
}
}
}
/*****************************************************************************
* process_rcvd_status
* this function handles the any status messages received on the bulk in pipe.
*****************************************************************************/
static void process_rcvd_status (struct edgeport_serial *edge_serial, __u8 byte2, __u8 byte3)
{
struct usb_serial_port *port;
struct edgeport_port *edge_port;
__u8 code = edge_serial->rxStatusCode;
/* switch the port pointer to the one being currently talked about */
port = edge_serial->serial->port[edge_serial->rxPort];
edge_port = usb_get_serial_port_data(port);
if (edge_port == NULL) {
dev_err(&edge_serial->serial->dev->dev, "%s - edge_port == NULL for port %d\n", __FUNCTION__, edge_serial->rxPort);
return;
}
dbg("%s - port %d", __FUNCTION__, edge_serial->rxPort);
if (code == IOSP_EXT_STATUS) {
switch (byte2) {
case IOSP_EXT_STATUS_CHASE_RSP:
// we want to do EXT status regardless of port open/closed
dbg("%s - Port %u EXT CHASE_RSP Data = %02x", __FUNCTION__, edge_serial->rxPort, byte3 );
// Currently, the only EXT_STATUS is Chase, so process here instead of one more call
// to one more subroutine. If/when more EXT_STATUS, there'll be more work to do.
// Also, we currently clear flag and close the port regardless of content of above's Byte3.
// We could choose to do something else when Byte3 says Timeout on Chase from Edgeport,
// like wait longer in block_until_chase_response, but for now we don't.
edge_port->chaseResponsePending = FALSE;
wake_up (&edge_port->wait_chase);
return;
case IOSP_EXT_STATUS_RX_CHECK_RSP:
dbg("%s ========== Port %u CHECK_RSP Sequence = %02x =============\n", __FUNCTION__, edge_serial->rxPort, byte3 );
//Port->RxCheckRsp = TRUE;
return;
}
}
if (code == IOSP_STATUS_OPEN_RSP) {
edge_port->txCredits = GET_TX_BUFFER_SIZE(byte3);
edge_port->maxTxCredits = edge_port->txCredits;
dbg("%s - Port %u Open Response Inital MSR = %02x TxBufferSize = %d", __FUNCTION__, edge_serial->rxPort, byte2, edge_port->txCredits);
handle_new_msr (edge_port, byte2);
/* send the current line settings to the port so we are in sync with any further termios calls */
if (edge_port->port->tty)
change_port_settings (edge_port, edge_port->port->tty->termios);
/* we have completed the open */
edge_port->openPending = FALSE;
edge_port->open = TRUE;
wake_up(&edge_port->wait_open);
return;
}
// If port is closed, silently discard all rcvd status. We can
// have cases where buffered status is received AFTER the close
// port command is sent to the Edgeport.
if ((!edge_port->open ) || (edge_port->closePending)) {
return;
}
switch (code) {
// Not currently sent by Edgeport
case IOSP_STATUS_LSR:
dbg("%s - Port %u LSR Status = %02x", __FUNCTION__, edge_serial->rxPort, byte2);
handle_new_lsr (edge_port, FALSE, byte2, 0);
break;
case IOSP_STATUS_LSR_DATA:
dbg("%s - Port %u LSR Status = %02x, Data = %02x", __FUNCTION__, edge_serial->rxPort, byte2, byte3);
// byte2 is LSR Register
// byte3 is broken data byte
handle_new_lsr (edge_port, TRUE, byte2, byte3);
break;
//
// case IOSP_EXT_4_STATUS:
// dbg("%s - Port %u LSR Status = %02x Data = %02x", __FUNCTION__, edge_serial->rxPort, byte2, byte3);
// break;
//
case IOSP_STATUS_MSR:
dbg("%s - Port %u MSR Status = %02x", __FUNCTION__, edge_serial->rxPort, byte2);
// Process this new modem status and generate appropriate
// events, etc, based on the new status. This routine
// also saves the MSR in Port->ShadowMsr.
handle_new_msr(edge_port, byte2);
break;
default:
dbg("%s - Unrecognized IOSP status code %u\n", __FUNCTION__, code);
break;
}
return;
}
/*****************************************************************************
* edge_tty_recv
* this function passes data on to the tty flip buffer
*****************************************************************************/
static void edge_tty_recv(struct device *dev, struct tty_struct *tty, unsigned char *data, int length)
{
int cnt;
do {
cnt = tty_buffer_request_room(tty, length);
if (cnt < length) {
dev_err(dev, "%s - dropping data, %d bytes lost\n",
__FUNCTION__, length - cnt);
if(cnt == 0)
break;
}
tty_insert_flip_string(tty, data, cnt);
data += cnt;
length -= cnt;
} while (length > 0);
tty_flip_buffer_push(tty);
}
/*****************************************************************************
* handle_new_msr
* this function handles any change to the msr register for a port.
*****************************************************************************/
static void handle_new_msr(struct edgeport_port *edge_port, __u8 newMsr)
{
struct async_icount *icount;
dbg("%s %02x", __FUNCTION__, newMsr);
if (newMsr & (EDGEPORT_MSR_DELTA_CTS | EDGEPORT_MSR_DELTA_DSR | EDGEPORT_MSR_DELTA_RI | EDGEPORT_MSR_DELTA_CD)) {
icount = &edge_port->icount;
/* update input line counters */
if (newMsr & EDGEPORT_MSR_DELTA_CTS) {
icount->cts++;
}
if (newMsr & EDGEPORT_MSR_DELTA_DSR) {
icount->dsr++;
}
if (newMsr & EDGEPORT_MSR_DELTA_CD) {
icount->dcd++;
}
if (newMsr & EDGEPORT_MSR_DELTA_RI) {
icount->rng++;
}
wake_up_interruptible(&edge_port->delta_msr_wait);
}
/* Save the new modem status */
edge_port->shadowMSR = newMsr & 0xf0;
return;
}
/*****************************************************************************
* handle_new_lsr
* this function handles any change to the lsr register for a port.
*****************************************************************************/
static void handle_new_lsr(struct edgeport_port *edge_port, __u8 lsrData, __u8 lsr, __u8 data)
{
__u8 newLsr = (__u8)(lsr & (__u8)(LSR_OVER_ERR | LSR_PAR_ERR | LSR_FRM_ERR | LSR_BREAK));
struct async_icount *icount;
dbg("%s - %02x", __FUNCTION__, newLsr);
edge_port->shadowLSR = lsr;
if (newLsr & LSR_BREAK) {
//
// Parity and Framing errors only count if they
// occur exclusive of a break being
// received.
//
newLsr &= (__u8)(LSR_OVER_ERR | LSR_BREAK);
}
/* Place LSR data byte into Rx buffer */
if (lsrData && edge_port->port->tty)
edge_tty_recv(&edge_port->port->dev, edge_port->port->tty, &data, 1);
/* update input line counters */
icount = &edge_port->icount;
if (newLsr & LSR_BREAK) {
icount->brk++;
}
if (newLsr & LSR_OVER_ERR) {
icount->overrun++;
}
if (newLsr & LSR_PAR_ERR) {
icount->parity++;
}
if (newLsr & LSR_FRM_ERR) {
icount->frame++;
}
return;
}
/****************************************************************************
* sram_write
* writes a number of bytes to the Edgeport device's sram starting at the
* given address.
* If successful returns the number of bytes written, otherwise it returns
* a negative error number of the problem.
****************************************************************************/
static int sram_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
{
int result;
__u16 current_length;
unsigned char *transfer_buffer;
dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);
transfer_buffer = kmalloc (64, GFP_KERNEL);
if (!transfer_buffer) {
dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
return -ENOMEM;
}
/* need to split these writes up into 64 byte chunks */
result = 0;
while (length > 0) {
if (length > 64) {
current_length = 64;
} else {
current_length = length;
}
// dbg("%s - writing %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
memcpy (transfer_buffer, data, current_length);
result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), USB_REQUEST_ION_WRITE_RAM,
0x40, addr, extAddr, transfer_buffer, current_length, 300);
if (result < 0)
break;
length -= current_length;
addr += current_length;
data += current_length;
}
kfree (transfer_buffer);
return result;
}
/****************************************************************************
* rom_write
* writes a number of bytes to the Edgeport device's ROM starting at the
* given address.
* If successful returns the number of bytes written, otherwise it returns
* a negative error number of the problem.
****************************************************************************/
static int rom_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
{
int result;
__u16 current_length;
unsigned char *transfer_buffer;
// dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);
transfer_buffer = kmalloc (64, GFP_KERNEL);
if (!transfer_buffer) {
dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
return -ENOMEM;
}
/* need to split these writes up into 64 byte chunks */
result = 0;
while (length > 0) {
if (length > 64) {
current_length = 64;
} else {
current_length = length;
}
// dbg("%s - writing %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
memcpy (transfer_buffer, data, current_length);
result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), USB_REQUEST_ION_WRITE_ROM,
0x40, addr, extAddr, transfer_buffer, current_length, 300);
if (result < 0)
break;
length -= current_length;
addr += current_length;
data += current_length;
}
kfree (transfer_buffer);
return result;
}
/****************************************************************************
* rom_read
* reads a number of bytes from the Edgeport device starting at the given
* address.
* If successful returns the number of bytes read, otherwise it returns
* a negative error number of the problem.
****************************************************************************/
static int rom_read (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
{
int result;
__u16 current_length;
unsigned char *transfer_buffer;
dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);
transfer_buffer = kmalloc (64, GFP_KERNEL);
if (!transfer_buffer) {
dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
return -ENOMEM;
}
/* need to split these reads up into 64 byte chunks */
result = 0;
while (length > 0) {
if (length > 64) {
current_length = 64;
} else {
current_length = length;
}
// dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
result = usb_control_msg (serial->dev, usb_rcvctrlpipe(serial->dev, 0), USB_REQUEST_ION_READ_ROM,
0xC0, addr, extAddr, transfer_buffer, current_length, 300);
if (result < 0)
break;
memcpy (data, transfer_buffer, current_length);
length -= current_length;
addr += current_length;
data += current_length;
}
kfree (transfer_buffer);
return result;
}
/****************************************************************************
* send_iosp_ext_cmd
* Is used to send a IOSP message to the Edgeport device
****************************************************************************/
static int send_iosp_ext_cmd (struct edgeport_port *edge_port, __u8 command, __u8 param)
{
unsigned char *buffer;
unsigned char *currentCommand;
int length = 0;
int status = 0;
dbg("%s - %d, %d", __FUNCTION__, command, param);
buffer = kmalloc (10, GFP_ATOMIC);
if (!buffer) {
dev_err(&edge_port->port->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 10);
return -ENOMEM;
}
currentCommand = buffer;
MAKE_CMD_EXT_CMD (&currentCommand, &length,
edge_port->port->number - edge_port->port->serial->minor,
command, param);
status = write_cmd_usb (edge_port, buffer, length);
if (status) {
/* something bad happened, let's free up the memory */
kfree(buffer);
}
return status;
}
/*****************************************************************************
* write_cmd_usb
* this function writes the given buffer out to the bulk write endpoint.
*****************************************************************************/
static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer, int length)
{
struct edgeport_serial *edge_serial = usb_get_serial_data(edge_port->port->serial);
int status = 0;
struct urb *urb;
int timeout;
usb_serial_debug_data(debug, &edge_port->port->dev, __FUNCTION__, length, buffer);
/* Allocate our next urb */
urb = usb_alloc_urb (0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
CmdUrbs++;
dbg("%s - ALLOCATE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);
usb_fill_bulk_urb (urb, edge_serial->serial->dev,
usb_sndbulkpipe(edge_serial->serial->dev, edge_serial->bulk_out_endpoint),
buffer, length, edge_bulk_out_cmd_callback, edge_port);
edge_port->commandPending = TRUE;
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
/* something went wrong */
dev_err(&edge_port->port->dev, "%s - usb_submit_urb(write command) failed, status = %d\n", __FUNCTION__, status);
usb_kill_urb(urb);
usb_free_urb(urb);
CmdUrbs--;
return status;
}
// wait for command to finish
timeout = COMMAND_TIMEOUT;
#if 0
wait_event (&edge_port->wait_command, (edge_port->commandPending == FALSE));
if (edge_port->commandPending == TRUE) {
/* command timed out */
dbg("%s - command timed out", __FUNCTION__);
status = -EINVAL;
}
#endif
return status;
}
/*****************************************************************************
* 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 edgeport_port *edge_port, int baudRate)
{
unsigned char *cmdBuffer;
unsigned char *currCmd;
int cmdLen = 0;
int divisor;
int status;
unsigned char number = edge_port->port->number - edge_port->port->serial->minor;
dbg("%s - port = %d, baud = %d", __FUNCTION__, edge_port->port->number, baudRate);
status = calc_baud_rate_divisor (baudRate, &divisor);
if (status) {
dev_err(&edge_port->port->dev, "%s - bad baud rate\n", __FUNCTION__);
return status;
}
// Alloc memory for the string of commands.
cmdBuffer = kmalloc (0x100, GFP_ATOMIC);
if (!cmdBuffer) {
dev_err(&edge_port->port->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 0x100);
return -ENOMEM;
}
currCmd = cmdBuffer;
// Enable access to divisor latch
MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, LCR, LCR_DL_ENABLE );
// Write the divisor itself
MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, DLL, LOW8 (divisor) );
MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, DLM, HIGH8(divisor) );
// Restore original value to disable access to divisor latch
MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, LCR, edge_port->shadowLCR);
status = write_cmd_usb(edge_port, cmdBuffer, cmdLen );
if (status) {
/* something bad happened, let's free up the memory */
kfree (cmdBuffer);
}
return status;
}
/*****************************************************************************
* 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;
dbg("%s - %d", __FUNCTION__, baudrate);
for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
if ( divisor_table[i].BaudRate == baudrate ) {
*divisor = divisor_table[i].Divisor;
return 0;
}
}
// We have tried all of the standard baud rates
// lets try to calculate the divisor for this baud rate
// Make sure the baud rate is reasonable
if (baudrate > 50 && baudrate < 230400) {
// get divisor
custom = (__u16)((230400L + baudrate/2) / baudrate);
*divisor = custom;
dbg("%s - Baud %d = %d\n", __FUNCTION__, baudrate, custom);
return 0;
}
return -1;
}
/*****************************************************************************
* send_cmd_write_uart_register
* this function builds up a uart register message and sends to to the device.
*****************************************************************************/
static int send_cmd_write_uart_register (struct edgeport_port *edge_port, __u8 regNum, __u8 regValue)
{
unsigned char *cmdBuffer;
unsigned char *currCmd;
unsigned long cmdLen = 0;
int status;
dbg("%s - write to %s register 0x%02x", (regNum == MCR) ? "MCR" : "LCR", __FUNCTION__, regValue);
// Alloc memory for the string of commands.
cmdBuffer = kmalloc (0x10, GFP_ATOMIC);
if (cmdBuffer == NULL ) {
return -ENOMEM;
}
currCmd = cmdBuffer;
// Build a cmd in the buffer to write the given register
MAKE_CMD_WRITE_REG (&currCmd, &cmdLen,
edge_port->port->number - edge_port->port->serial->minor,
regNum, regValue);
status = write_cmd_usb(edge_port, cmdBuffer, cmdLen);
if (status) {
/* something bad happened, let's free up the memory */
kfree (cmdBuffer);
}
return status;
}
/*****************************************************************************
* change_port_settings
* This routine is called to set the UART on the device to match the specified
* new settings.
*****************************************************************************/
#ifndef CMSPAR
#define CMSPAR 0
#endif
static void change_port_settings (struct edgeport_port *edge_port, struct termios *old_termios)
{
struct tty_struct *tty;
int baud;
unsigned cflag;
__u8 mask = 0xff;
__u8 lData;
__u8 lParity;
__u8 lStop;
__u8 rxFlow;
__u8 txFlow;
int status;
dbg("%s - port %d", __FUNCTION__, edge_port->port->number);
if ((!edge_port->open) &&
(!edge_port->openPending)) {
dbg("%s - port not opened", __FUNCTION__);
return;
}
tty = edge_port->port->tty;
if ((!tty) ||
(!tty->termios)) {
dbg("%s - no tty structures", __FUNCTION__);
return;
}
cflag = tty->termios->c_cflag;
switch (cflag & CSIZE) {
case CS5: lData = LCR_BITS_5; mask = 0x1f; dbg("%s - data bits = 5", __FUNCTION__); break;
case CS6: lData = LCR_BITS_6; mask = 0x3f; dbg("%s - data bits = 6", __FUNCTION__); break;
case CS7: lData = LCR_BITS_7; mask = 0x7f; dbg("%s - data bits = 7", __FUNCTION__); break;
default:
case CS8: lData = LCR_BITS_8; dbg("%s - data bits = 8", __FUNCTION__); break;
}
lParity = LCR_PAR_NONE;
if (cflag & PARENB) {
if (cflag & CMSPAR) {
if (cflag & PARODD) {
lParity = LCR_PAR_MARK;
dbg("%s - parity = mark", __FUNCTION__);
} else {
lParity = LCR_PAR_SPACE;
dbg("%s - parity = space", __FUNCTION__);
}
} else if (cflag & PARODD) {
lParity = LCR_PAR_ODD;
dbg("%s - parity = odd", __FUNCTION__);
} else {
lParity = LCR_PAR_EVEN;
dbg("%s - parity = even", __FUNCTION__);
}
} else {
dbg("%s - parity = none", __FUNCTION__);
}
if (cflag & CSTOPB) {
lStop = LCR_STOP_2;
dbg("%s - stop bits = 2", __FUNCTION__);
} else {
lStop = LCR_STOP_1;
dbg("%s - stop bits = 1", __FUNCTION__);
}
/* figure out the flow control settings */
rxFlow = txFlow = 0x00;
if (cflag & CRTSCTS) {
rxFlow |= IOSP_RX_FLOW_RTS;
txFlow |= IOSP_TX_FLOW_CTS;
dbg("%s - RTS/CTS is enabled", __FUNCTION__);
} else {
dbg("%s - RTS/CTS is disabled", __FUNCTION__);
}
/* if we are implementing XON/XOFF, set the start and stop character in the device */
if (I_IXOFF(tty) || I_IXON(tty)) {
unsigned char stop_char = STOP_CHAR(tty);
unsigned char start_char = START_CHAR(tty);
send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_XON_CHAR, start_char);
send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_XOFF_CHAR, stop_char);
/* if we are implementing INBOUND XON/XOFF */
if (I_IXOFF(tty)) {
rxFlow |= IOSP_RX_FLOW_XON_XOFF;
dbg("%s - INBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x", __FUNCTION__, start_char, stop_char);
} else {
dbg("%s - INBOUND XON/XOFF is disabled", __FUNCTION__);
}
/* if we are implementing OUTBOUND XON/XOFF */
if (I_IXON(tty)) {
txFlow |= IOSP_TX_FLOW_XON_XOFF;
dbg("%s - OUTBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x", __FUNCTION__, start_char, stop_char);
} else {
dbg("%s - OUTBOUND XON/XOFF is disabled", __FUNCTION__);
}
}
/* Set flow control to the configured value */
send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_RX_FLOW, rxFlow);
send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_TX_FLOW, txFlow);
edge_port->shadowLCR &= ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
edge_port->shadowLCR |= (lData | lParity | lStop);
edge_port->validDataMask = mask;
/* Send the updated LCR value to the EdgePort */
status = send_cmd_write_uart_register(edge_port, LCR, edge_port->shadowLCR);
if (status != 0) {
return;
}
/* set up the MCR register and send it to the EdgePort */
edge_port->shadowMCR = MCR_MASTER_IE;
if (cflag & CBAUD) {
edge_port->shadowMCR |= (MCR_DTR | MCR_RTS);
}
status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
if (status != 0) {
return;
}
/* Determine divisor based on baud rate */
baud = tty_get_baud_rate(tty);
if (!baud) {
/* pick a default, any default... */
baud = 9600;
}
dbg("%s - baud rate = %d", __FUNCTION__, baud);
status = send_cmd_write_baud_rate (edge_port, baud);
return;
}
/****************************************************************************
* unicode_to_ascii
* Turns a string from Unicode into ASCII.
* Doesn't do a good job with any characters that are outside the normal
* ASCII range, but it's only for debugging...
* NOTE: expects the unicode in LE format
****************************************************************************/
static void unicode_to_ascii(char *string, int buflen, __le16 *unicode, int unicode_size)
{
int i;
if (buflen <= 0) /* never happens, but... */
return;
--buflen; /* space for nul */
for (i = 0; i < unicode_size; i++) {
if (i >= buflen)
break;
string[i] = (char)(le16_to_cpu(unicode[i]));
}
string[i] = 0x00;
}
/****************************************************************************
* get_manufacturing_desc
* reads in the manufacturing descriptor and stores it into the serial
* structure.
****************************************************************************/
static void get_manufacturing_desc (struct edgeport_serial *edge_serial)
{
int response;
dbg("getting manufacturer descriptor");
response = rom_read (edge_serial->serial, (EDGE_MANUF_DESC_ADDR & 0xffff0000) >> 16,
(__u16)(EDGE_MANUF_DESC_ADDR & 0x0000ffff), EDGE_MANUF_DESC_LEN,
(__u8 *)(&edge_serial->manuf_descriptor));
if (response < 1) {
dev_err(&edge_serial->serial->dev->dev, "error in getting manufacturer descriptor\n");
} else {
char string[30];
dbg("**Manufacturer Descriptor");
dbg(" RomSize: %dK", edge_serial->manuf_descriptor.RomSize);
dbg(" RamSize: %dK", edge_serial->manuf_descriptor.RamSize);
dbg(" CpuRev: %d", edge_serial->manuf_descriptor.CpuRev);
dbg(" BoardRev: %d", edge_serial->manuf_descriptor.BoardRev);
dbg(" NumPorts: %d", edge_serial->manuf_descriptor.NumPorts);
dbg(" DescDate: %d/%d/%d", edge_serial->manuf_descriptor.DescDate[0], edge_serial->manuf_descriptor.DescDate[1], edge_serial->manuf_descriptor.DescDate[2]+1900);
unicode_to_ascii(string, sizeof(string),
edge_serial->manuf_descriptor.SerialNumber,
edge_serial->manuf_descriptor.SerNumLength/2);
dbg(" SerialNumber: %s", string);
unicode_to_ascii(string, sizeof(string),
edge_serial->manuf_descriptor.AssemblyNumber,
edge_serial->manuf_descriptor.AssemblyNumLength/2);
dbg(" AssemblyNumber: %s", string);
unicode_to_ascii(string, sizeof(string),
edge_serial->manuf_descriptor.OemAssyNumber,
edge_serial->manuf_descriptor.OemAssyNumLength/2);
dbg(" OemAssyNumber: %s", string);
dbg(" UartType: %d", edge_serial->manuf_descriptor.UartType);
dbg(" IonPid: %d", edge_serial->manuf_descriptor.IonPid);
dbg(" IonConfig: %d", edge_serial->manuf_descriptor.IonConfig);
}
}
/****************************************************************************
* get_boot_desc
* reads in the bootloader descriptor and stores it into the serial
* structure.
****************************************************************************/
static void get_boot_desc (struct edgeport_serial *edge_serial)
{
int response;
dbg("getting boot descriptor");
response = rom_read (edge_serial->serial, (EDGE_BOOT_DESC_ADDR & 0xffff0000) >> 16,
(__u16)(EDGE_BOOT_DESC_ADDR & 0x0000ffff), EDGE_BOOT_DESC_LEN,
(__u8 *)(&edge_serial->boot_descriptor));
if (response < 1) {
dev_err(&edge_serial->serial->dev->dev, "error in getting boot descriptor\n");
} else {
dbg("**Boot Descriptor:");
dbg(" BootCodeLength: %d", le16_to_cpu(edge_serial->boot_descriptor.BootCodeLength));
dbg(" MajorVersion: %d", edge_serial->boot_descriptor.MajorVersion);
dbg(" MinorVersion: %d", edge_serial->boot_descriptor.MinorVersion);
dbg(" BuildNumber: %d", le16_to_cpu(edge_serial->boot_descriptor.BuildNumber));
dbg(" Capabilities: 0x%x", le16_to_cpu(edge_serial->boot_descriptor.Capabilities));
dbg(" UConfig0: %d", edge_serial->boot_descriptor.UConfig0);
dbg(" UConfig1: %d", edge_serial->boot_descriptor.UConfig1);
}
}
/****************************************************************************
* load_application_firmware
* This is called to load the application firmware to the device
****************************************************************************/
static void load_application_firmware (struct edgeport_serial *edge_serial)
{
struct edge_firmware_image_record *record;
unsigned char *firmware;
unsigned char *FirmwareImage;
int ImageSize;
int response;
switch (edge_serial->product_info.iDownloadFile) {
case EDGE_DOWNLOAD_FILE_I930:
dbg("downloading firmware version (930) %d.%d.%d",
OperationalCodeImageVersion_GEN1.MajorVersion,
OperationalCodeImageVersion_GEN1.MinorVersion,
OperationalCodeImageVersion_GEN1.BuildNumber);
firmware = &OperationalCodeImage_GEN1[0];
FirmwareImage = &OperationalCodeImage_GEN1[0];
ImageSize = sizeof(OperationalCodeImage_GEN1);
break;
case EDGE_DOWNLOAD_FILE_80251:
dbg("downloading firmware version (80251) %d.%d.%d",
OperationalCodeImageVersion_GEN2.MajorVersion,
OperationalCodeImageVersion_GEN2.MinorVersion,
OperationalCodeImageVersion_GEN2.BuildNumber);
firmware = &OperationalCodeImage_GEN2[0];
FirmwareImage = &OperationalCodeImage_GEN2[0];
ImageSize = sizeof(OperationalCodeImage_GEN2);
break;
case EDGE_DOWNLOAD_FILE_NONE:
dbg ("No download file specified, skipping download\n");
return;
default:
return;
}
for (;;) {
record = (struct edge_firmware_image_record *)firmware;
response = sram_write (edge_serial->serial, le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len), &record->Data[0]);
if (response < 0) {
dev_err(&edge_serial->serial->dev->dev, "sram_write failed (%x, %x, %d)\n", le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len));
break;
}
firmware += sizeof (struct edge_firmware_image_record) + le16_to_cpu(record->Len);
if (firmware >= &FirmwareImage[ImageSize]) {
break;
}
}
dbg("sending exec_dl_code");
response = usb_control_msg (edge_serial->serial->dev,
usb_sndctrlpipe(edge_serial->serial->dev, 0),
USB_REQUEST_ION_EXEC_DL_CODE,
0x40, 0x4000, 0x0001, NULL, 0, 3000);
return;
}
/****************************************************************************
* edge_startup
****************************************************************************/
static int edge_startup (struct usb_serial *serial)
{
struct edgeport_serial *edge_serial;
struct edgeport_port *edge_port;
struct usb_device *dev;
int i, j;
dev = serial->dev;
/* create our private serial structure */
edge_serial = kzalloc(sizeof(struct edgeport_serial), GFP_KERNEL);
if (edge_serial == NULL) {
dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
return -ENOMEM;
}
spin_lock_init(&edge_serial->es_lock);
edge_serial->serial = serial;
usb_set_serial_data(serial, edge_serial);
/* get the name for the device from the device */
i = get_string(dev, dev->descriptor.iManufacturer,
&edge_serial->name[0], MAX_NAME_LEN+1);
edge_serial->name[i++] = ' ';
get_string(dev, dev->descriptor.iProduct,
&edge_serial->name[i], MAX_NAME_LEN+2 - i);
dev_info(&serial->dev->dev, "%s detected\n", edge_serial->name);
/* get the manufacturing descriptor for this device */
get_manufacturing_desc (edge_serial);
/* get the boot descriptor */
get_boot_desc (edge_serial);
get_product_info(edge_serial);
/* set the number of ports from the manufacturing description */
/* serial->num_ports = serial->product_info.NumPorts; */
if (edge_serial->product_info.NumPorts != serial->num_ports) {
warn("%s - Device Reported %d serial ports vs core "
"thinking we have %d ports, email greg@kroah.com this info.",
__FUNCTION__, edge_serial->product_info.NumPorts,
serial->num_ports);
}
dbg("%s - time 1 %ld", __FUNCTION__, jiffies);
/* now load the application firmware into this device */
load_application_firmware (edge_serial);
dbg("%s - time 2 %ld", __FUNCTION__, jiffies);
/* Check current Edgeport EEPROM and update if necessary */
update_edgeport_E2PROM (edge_serial);
dbg("%s - time 3 %ld", __FUNCTION__, jiffies);
/* set the configuration to use #1 */
// dbg("set_configuration 1");
// usb_set_configuration (dev, 1);
/* we set up the pointers to the endpoints in the edge_open function,
* as the structures aren't created yet. */
/* set up our port private structures */
for (i = 0; i < serial->num_ports; ++i) {
edge_port = kmalloc (sizeof(struct edgeport_port), GFP_KERNEL);
if (edge_port == NULL) {
dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
for (j = 0; j < i; ++j) {
kfree (usb_get_serial_port_data(serial->port[j]));
usb_set_serial_port_data(serial->port[j], NULL);
}
usb_set_serial_data(serial, NULL);
kfree(edge_serial);
return -ENOMEM;
}
memset (edge_port, 0, sizeof(struct edgeport_port));
spin_lock_init(&edge_port->ep_lock);
edge_port->port = serial->port[i];
usb_set_serial_port_data(serial->port[i], edge_port);
}
return 0;
}
/****************************************************************************
* edge_shutdown
* This function is called whenever the device is removed from the usb bus.
****************************************************************************/
static void edge_shutdown (struct usb_serial *serial)
{
int i;
dbg("%s", __FUNCTION__);
/* stop reads and writes on all ports */
for (i=0; i < serial->num_ports; ++i) {
kfree (usb_get_serial_port_data(serial->port[i]));
usb_set_serial_port_data(serial->port[i], NULL);
}
kfree (usb_get_serial_data(serial));
usb_set_serial_data(serial, NULL);
}
/****************************************************************************
* edgeport_init
* This is called by the module subsystem, or on startup to initialize us
****************************************************************************/
static int __init edgeport_init(void)
{
int retval;
retval = usb_serial_register(&edgeport_2port_device);
if (retval)
goto failed_2port_device_register;
retval = usb_serial_register(&edgeport_4port_device);
if (retval)
goto failed_4port_device_register;
retval = usb_serial_register(&edgeport_8port_device);
if (retval)
goto failed_8port_device_register;
retval = usb_register(&io_driver);
if (retval)
goto failed_usb_register;
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
failed_usb_register:
usb_serial_deregister(&edgeport_8port_device);
failed_8port_device_register:
usb_serial_deregister(&edgeport_4port_device);
failed_4port_device_register:
usb_serial_deregister(&edgeport_2port_device);
failed_2port_device_register:
return retval;
}
/****************************************************************************
* edgeport_exit
* Called when the driver is about to be unloaded.
****************************************************************************/
static void __exit edgeport_exit (void)
{
usb_deregister (&io_driver);
usb_serial_deregister (&edgeport_2port_device);
usb_serial_deregister (&edgeport_4port_device);
usb_serial_deregister (&edgeport_8port_device);
}
module_init(edgeport_init);
module_exit(edgeport_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");
module_param(low_latency, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(low_latency, "Low latency enabled or not");
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