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linux/drivers/parport/ieee1284_ops.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

916 lines
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// SPDX-License-Identifier: GPL-2.0
/* IEEE-1284 operations for parport.
*
* This file is for generic IEEE 1284 operations. The idea is that
* they are used by the low-level drivers. If they have a special way
* of doing something, they can provide their own routines (and put
* the function pointers in port->ops); if not, they can just use these
* as a fallback.
*
* Note: Make no assumptions about hardware or architecture in this file!
*
* Author: Tim Waugh <tim@cyberelk.demon.co.uk>
* Fixed AUTOFD polarity in ecp_forward_to_reverse(). Fred Barnes, 1999
* Software emulated EPP fixes, Fred Barnes, 04/2001.
*/
#include <linux/module.h>
#include <linux/parport.h>
#include <linux/delay.h>
#include <linux/sched/signal.h>
#include <linux/uaccess.h>
#undef DEBUG /* undef me for production */
#ifdef CONFIG_LP_CONSOLE
#undef DEBUG /* Don't want a garbled console */
#endif
#ifdef DEBUG
#define DPRINTK(stuff...) printk (stuff)
#else
#define DPRINTK(stuff...)
#endif
/*** *
* One-way data transfer functions. *
* ***/
/* Compatibility mode. */
size_t parport_ieee1284_write_compat (struct parport *port,
const void *buffer, size_t len,
int flags)
{
int no_irq = 1;
ssize_t count = 0;
const unsigned char *addr = buffer;
unsigned char byte;
struct pardevice *dev = port->physport->cad;
unsigned char ctl = (PARPORT_CONTROL_SELECT
| PARPORT_CONTROL_INIT);
if (port->irq != PARPORT_IRQ_NONE) {
parport_enable_irq (port);
no_irq = 0;
}
port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA;
parport_write_control (port, ctl);
parport_data_forward (port);
while (count < len) {
unsigned long expire = jiffies + dev->timeout;
long wait = msecs_to_jiffies(10);
unsigned char mask = (PARPORT_STATUS_ERROR
| PARPORT_STATUS_BUSY);
unsigned char val = (PARPORT_STATUS_ERROR
| PARPORT_STATUS_BUSY);
/* Wait until the peripheral's ready */
do {
/* Is the peripheral ready yet? */
if (!parport_wait_peripheral (port, mask, val))
/* Skip the loop */
goto ready;
/* Is the peripheral upset? */
if ((parport_read_status (port) &
(PARPORT_STATUS_PAPEROUT |
PARPORT_STATUS_SELECT |
PARPORT_STATUS_ERROR))
!= (PARPORT_STATUS_SELECT |
PARPORT_STATUS_ERROR))
/* If nFault is asserted (i.e. no
* error) and PAPEROUT and SELECT are
* just red herrings, give the driver
* a chance to check it's happy with
* that before continuing. */
goto stop;
/* Have we run out of time? */
if (!time_before (jiffies, expire))
break;
/* Yield the port for a while. If this is the
first time around the loop, don't let go of
the port. This way, we find out if we have
our interrupt handler called. */
if (count && no_irq) {
parport_release (dev);
schedule_timeout_interruptible(wait);
parport_claim_or_block (dev);
}
else
/* We must have the device claimed here */
parport_wait_event (port, wait);
/* Is there a signal pending? */
if (signal_pending (current))
break;
/* Wait longer next time. */
wait *= 2;
} while (time_before (jiffies, expire));
if (signal_pending (current))
break;
DPRINTK (KERN_DEBUG "%s: Timed out\n", port->name);
break;
ready:
/* Write the character to the data lines. */
byte = *addr++;
parport_write_data (port, byte);
udelay (1);
/* Pulse strobe. */
parport_write_control (port, ctl | PARPORT_CONTROL_STROBE);
udelay (1); /* strobe */
parport_write_control (port, ctl);
udelay (1); /* hold */
/* Assume the peripheral received it. */
count++;
/* Let another process run if it needs to. */
if (time_before (jiffies, expire))
if (!parport_yield_blocking (dev)
&& need_resched())
schedule ();
}
stop:
port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return count;
}
/* Nibble mode. */
size_t parport_ieee1284_read_nibble (struct parport *port,
void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
unsigned char *buf = buffer;
int i;
unsigned char byte = 0;
len *= 2; /* in nibbles */
for (i=0; i < len; i++) {
unsigned char nibble;
/* Does the error line indicate end of data? */
if (((i & 1) == 0) &&
(parport_read_status(port) & PARPORT_STATUS_ERROR)) {
goto end_of_data;
}
/* Event 7: Set nAutoFd low. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 9: nAck goes low. */
port->ieee1284.phase = IEEE1284_PH_REV_DATA;
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK, 0)) {
/* Timeout -- no more data? */
DPRINTK (KERN_DEBUG
"%s: Nibble timeout at event 9 (%d bytes)\n",
port->name, i/2);
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
break;
}
/* Read a nibble. */
nibble = parport_read_status (port) >> 3;
nibble &= ~8;
if ((nibble & 0x10) == 0)
nibble |= 8;
nibble &= 0xf;
/* Event 10: Set nAutoFd high. */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 11: nAck goes high. */
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* Timeout -- no more data? */
DPRINTK (KERN_DEBUG
"%s: Nibble timeout at event 11\n",
port->name);
break;
}
if (i & 1) {
/* Second nibble */
byte |= nibble << 4;
*buf++ = byte;
} else
byte = nibble;
}
if (i == len) {
/* Read the last nibble without checking data avail. */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
end_of_data:
DPRINTK (KERN_DEBUG
"%s: No more nibble data (%d bytes)\n",
port->name, i/2);
/* Go to reverse idle phase. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
}
else
port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
}
return i/2;
#endif /* IEEE1284 support */
}
/* Byte mode. */
size_t parport_ieee1284_read_byte (struct parport *port,
void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
unsigned char *buf = buffer;
ssize_t count = 0;
for (count = 0; count < len; count++) {
unsigned char byte;
/* Data available? */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
goto end_of_data;
}
/* Event 14: Place data bus in high impedance state. */
parport_data_reverse (port);
/* Event 7: Set nAutoFd low. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 9: nAck goes low. */
port->physport->ieee1284.phase = IEEE1284_PH_REV_DATA;
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK,
0)) {
/* Timeout -- no more data? */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
0);
DPRINTK (KERN_DEBUG "%s: Byte timeout at event 9\n",
port->name);
break;
}
byte = parport_read_data (port);
*buf++ = byte;
/* Event 10: Set nAutoFd high */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 11: nAck goes high. */
if (parport_wait_peripheral (port,
PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* Timeout -- no more data? */
DPRINTK (KERN_DEBUG "%s: Byte timeout at event 11\n",
port->name);
break;
}
/* Event 16: Set nStrobe low. */
parport_frob_control (port,
PARPORT_CONTROL_STROBE,
PARPORT_CONTROL_STROBE);
udelay (5);
/* Event 17: Set nStrobe high. */
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
}
if (count == len) {
/* Read the last byte without checking data avail. */
if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
end_of_data:
DPRINTK (KERN_DEBUG
"%s: No more byte data (%zd bytes)\n",
port->name, count);
/* Go to reverse idle phase. */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
}
else
port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
}
return count;
#endif /* IEEE1284 support */
}
/*** *
* ECP Functions. *
* ***/
#ifdef CONFIG_PARPORT_1284
static inline
int ecp_forward_to_reverse (struct parport *port)
{
int retval;
/* Event 38: Set nAutoFd low */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
parport_data_reverse (port);
udelay (5);
/* Event 39: Set nInit low to initiate bus reversal */
parport_frob_control (port,
PARPORT_CONTROL_INIT,
0);
/* Event 40: PError goes low */
retval = parport_wait_peripheral (port,
PARPORT_STATUS_PAPEROUT, 0);
if (!retval) {
DPRINTK (KERN_DEBUG "%s: ECP direction: reverse\n",
port->name);
port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
} else {
DPRINTK (KERN_DEBUG "%s: ECP direction: failed to reverse\n",
port->name);
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
}
return retval;
}
static inline
int ecp_reverse_to_forward (struct parport *port)
{
int retval;
/* Event 47: Set nInit high */
parport_frob_control (port,
PARPORT_CONTROL_INIT
| PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_INIT
| PARPORT_CONTROL_AUTOFD);
/* Event 49: PError goes high */
retval = parport_wait_peripheral (port,
PARPORT_STATUS_PAPEROUT,
PARPORT_STATUS_PAPEROUT);
if (!retval) {
parport_data_forward (port);
DPRINTK (KERN_DEBUG "%s: ECP direction: forward\n",
port->name);
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
} else {
DPRINTK (KERN_DEBUG
"%s: ECP direction: failed to switch forward\n",
port->name);
port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN;
}
return retval;
}
#endif /* IEEE1284 support */
/* ECP mode, forward channel, data. */
size_t parport_ieee1284_ecp_write_data (struct parport *port,
const void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
const unsigned char *buf = buffer;
size_t written;
int retry;
port = port->physport;
if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
if (ecp_reverse_to_forward (port))
return 0;
port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
/* HostAck high (data, not command) */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD
| PARPORT_CONTROL_STROBE
| PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
for (written = 0; written < len; written++, buf++) {
unsigned long expire = jiffies + port->cad->timeout;
unsigned char byte;
byte = *buf;
try_again:
parport_write_data (port, byte);
parport_frob_control (port, PARPORT_CONTROL_STROBE,
PARPORT_CONTROL_STROBE);
udelay (5);
for (retry = 0; retry < 100; retry++) {
if (!parport_wait_peripheral (port,
PARPORT_STATUS_BUSY, 0))
goto success;
if (signal_pending (current)) {
parport_frob_control (port,
PARPORT_CONTROL_STROBE,
0);
break;
}
}
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
parport_frob_control (port, PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
udelay (50);
if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
/* It's buggered. */
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
break;
}
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
udelay (50);
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
break;
DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
port->name);
if (time_after_eq (jiffies, expire)) break;
goto try_again;
success:
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
udelay (5);
if (parport_wait_peripheral (port,
PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY))
/* Peripheral hasn't accepted the data. */
break;
}
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return written;
#endif /* IEEE1284 support */
}
/* ECP mode, reverse channel, data. */
size_t parport_ieee1284_ecp_read_data (struct parport *port,
void *buffer, size_t len, int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
struct pardevice *dev = port->cad;
unsigned char *buf = buffer;
int rle_count = 0; /* shut gcc up */
unsigned char ctl;
int rle = 0;
ssize_t count = 0;
port = port->physport;
if (port->ieee1284.phase != IEEE1284_PH_REV_IDLE)
if (ecp_forward_to_reverse (port))
return 0;
port->ieee1284.phase = IEEE1284_PH_REV_DATA;
/* Set HostAck low to start accepting data. */
ctl = parport_read_control (port);
ctl &= ~(PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT |
PARPORT_CONTROL_AUTOFD);
parport_write_control (port,
ctl | PARPORT_CONTROL_AUTOFD);
while (count < len) {
unsigned long expire = jiffies + dev->timeout;
unsigned char byte;
int command;
/* Event 43: Peripheral sets nAck low. It can take as
long as it wants. */
while (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) {
/* The peripheral hasn't given us data in
35ms. If we have data to give back to the
caller, do it now. */
if (count)
goto out;
/* If we've used up all the time we were allowed,
give up altogether. */
if (!time_before (jiffies, expire))
goto out;
/* Yield the port for a while. */
if (count && dev->port->irq != PARPORT_IRQ_NONE) {
parport_release (dev);
schedule_timeout_interruptible(msecs_to_jiffies(40));
parport_claim_or_block (dev);
}
else
/* We must have the device claimed here. */
parport_wait_event (port, msecs_to_jiffies(40));
/* Is there a signal pending? */
if (signal_pending (current))
goto out;
}
/* Is this a command? */
if (rle)
/* The last byte was a run-length count, so
this can't be as well. */
command = 0;
else
command = (parport_read_status (port) &
PARPORT_STATUS_BUSY) ? 1 : 0;
/* Read the data. */
byte = parport_read_data (port);
/* If this is a channel command, rather than an RLE
command or a normal data byte, don't accept it. */
if (command) {
if (byte & 0x80) {
DPRINTK (KERN_DEBUG "%s: stopping short at "
"channel command (%02x)\n",
port->name, byte);
goto out;
}
else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE)
DPRINTK (KERN_DEBUG "%s: device illegally "
"using RLE; accepting anyway\n",
port->name);
rle_count = byte + 1;
/* Are we allowed to read that many bytes? */
if (rle_count > (len - count)) {
DPRINTK (KERN_DEBUG "%s: leaving %d RLE bytes "
"for next time\n", port->name,
rle_count);
break;
}
rle = 1;
}
/* Event 44: Set HostAck high, acknowledging handshake. */
parport_write_control (port, ctl);
/* Event 45: The peripheral has 35ms to set nAck high. */
if (parport_wait_peripheral (port, PARPORT_STATUS_ACK,
PARPORT_STATUS_ACK)) {
/* It's gone wrong. Return what data we have
to the caller. */
DPRINTK (KERN_DEBUG "ECP read timed out at 45\n");
if (command)
printk (KERN_WARNING
"%s: command ignored (%02x)\n",
port->name, byte);
break;
}
/* Event 46: Set HostAck low and accept the data. */
parport_write_control (port,
ctl | PARPORT_CONTROL_AUTOFD);
/* If we just read a run-length count, fetch the data. */
if (command)
continue;
/* If this is the byte after a run-length count, decompress. */
if (rle) {
rle = 0;
memset (buf, byte, rle_count);
buf += rle_count;
count += rle_count;
DPRINTK (KERN_DEBUG "%s: decompressed to %d bytes\n",
port->name, rle_count);
} else {
/* Normal data byte. */
*buf = byte;
buf++, count++;
}
}
out:
port->ieee1284.phase = IEEE1284_PH_REV_IDLE;
return count;
#endif /* IEEE1284 support */
}
/* ECP mode, forward channel, commands. */
size_t parport_ieee1284_ecp_write_addr (struct parport *port,
const void *buffer, size_t len,
int flags)
{
#ifndef CONFIG_PARPORT_1284
return 0;
#else
const unsigned char *buf = buffer;
size_t written;
int retry;
port = port->physport;
if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE)
if (ecp_reverse_to_forward (port))
return 0;
port->ieee1284.phase = IEEE1284_PH_FWD_DATA;
/* HostAck low (command, not data) */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD
| PARPORT_CONTROL_STROBE
| PARPORT_CONTROL_INIT,
PARPORT_CONTROL_AUTOFD
| PARPORT_CONTROL_INIT);
for (written = 0; written < len; written++, buf++) {
unsigned long expire = jiffies + port->cad->timeout;
unsigned char byte;
byte = *buf;
try_again:
parport_write_data (port, byte);
parport_frob_control (port, PARPORT_CONTROL_STROBE,
PARPORT_CONTROL_STROBE);
udelay (5);
for (retry = 0; retry < 100; retry++) {
if (!parport_wait_peripheral (port,
PARPORT_STATUS_BUSY, 0))
goto success;
if (signal_pending (current)) {
parport_frob_control (port,
PARPORT_CONTROL_STROBE,
0);
break;
}
}
/* Time for Host Transfer Recovery (page 41 of IEEE1284) */
DPRINTK (KERN_DEBUG "%s: ECP transfer stalled!\n", port->name);
parport_frob_control (port, PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
udelay (50);
if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) {
/* It's buggered. */
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
break;
}
parport_frob_control (port, PARPORT_CONTROL_INIT, 0);
udelay (50);
if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT))
break;
DPRINTK (KERN_DEBUG "%s: Host transfer recovered\n",
port->name);
if (time_after_eq (jiffies, expire)) break;
goto try_again;
success:
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
udelay (5);
if (parport_wait_peripheral (port,
PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY))
/* Peripheral hasn't accepted the data. */
break;
}
port->ieee1284.phase = IEEE1284_PH_FWD_IDLE;
return written;
#endif /* IEEE1284 support */
}
/*** *
* EPP functions. *
* ***/
/* EPP mode, forward channel, data. */
size_t parport_ieee1284_epp_write_data (struct parport *port,
const void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
size_t ret = 0;
/* set EPP idle state (just to make sure) with strobe low */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_INIT);
port->ops->data_forward (port);
for (; len > 0; len--, bp++) {
/* Event 62: Write data and set autofd low */
parport_write_data (port, *bp);
parport_frob_control (port, PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 58: wait for busy (nWait) to go high */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10))
break;
/* Event 63: set nAutoFd (nDStrb) high */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 60: wait for busy (nWait) to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5))
break;
ret++;
}
/* Event 61: set strobe (nWrite) high */
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
return ret;
}
/* EPP mode, reverse channel, data. */
size_t parport_ieee1284_epp_read_data (struct parport *port,
void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
unsigned ret = 0;
/* set EPP idle state (just to make sure) with strobe high */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
port->ops->data_reverse (port);
for (; len > 0; len--, bp++) {
/* Event 67: set nAutoFd (nDStrb) low */
parport_frob_control (port,
PARPORT_CONTROL_AUTOFD,
PARPORT_CONTROL_AUTOFD);
/* Event 58: wait for Busy to go high */
if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) {
break;
}
*bp = parport_read_data (port);
/* Event 63: set nAutoFd (nDStrb) high */
parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
/* Event 60: wait for Busy to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5)) {
break;
}
ret++;
}
port->ops->data_forward (port);
return ret;
}
/* EPP mode, forward channel, addresses. */
size_t parport_ieee1284_epp_write_addr (struct parport *port,
const void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
size_t ret = 0;
/* set EPP idle state (just to make sure) with strobe low */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_INIT);
port->ops->data_forward (port);
for (; len > 0; len--, bp++) {
/* Event 56: Write data and set nAStrb low. */
parport_write_data (port, *bp);
parport_frob_control (port, PARPORT_CONTROL_SELECT,
PARPORT_CONTROL_SELECT);
/* Event 58: wait for busy (nWait) to go high */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10))
break;
/* Event 59: set nAStrb high */
parport_frob_control (port, PARPORT_CONTROL_SELECT, 0);
/* Event 60: wait for busy (nWait) to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5))
break;
ret++;
}
/* Event 61: set strobe (nWrite) high */
parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
return ret;
}
/* EPP mode, reverse channel, addresses. */
size_t parport_ieee1284_epp_read_addr (struct parport *port,
void *buffer, size_t len,
int flags)
{
unsigned char *bp = (unsigned char *) buffer;
unsigned ret = 0;
/* Set EPP idle state (just to make sure) with strobe high */
parport_frob_control (port,
PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_SELECT |
PARPORT_CONTROL_INIT,
PARPORT_CONTROL_INIT);
port->ops->data_reverse (port);
for (; len > 0; len--, bp++) {
/* Event 64: set nSelectIn (nAStrb) low */
parport_frob_control (port, PARPORT_CONTROL_SELECT,
PARPORT_CONTROL_SELECT);
/* Event 58: wait for Busy to go high */
if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) {
break;
}
*bp = parport_read_data (port);
/* Event 59: set nSelectIn (nAStrb) high */
parport_frob_control (port, PARPORT_CONTROL_SELECT,
0);
/* Event 60: wait for Busy to go low */
if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY,
PARPORT_STATUS_BUSY, 5))
break;
ret++;
}
port->ops->data_forward (port);
return ret;
}
EXPORT_SYMBOL(parport_ieee1284_ecp_write_data);
EXPORT_SYMBOL(parport_ieee1284_ecp_read_data);
EXPORT_SYMBOL(parport_ieee1284_ecp_write_addr);
EXPORT_SYMBOL(parport_ieee1284_write_compat);
EXPORT_SYMBOL(parport_ieee1284_read_nibble);
EXPORT_SYMBOL(parport_ieee1284_read_byte);
EXPORT_SYMBOL(parport_ieee1284_epp_write_data);
EXPORT_SYMBOL(parport_ieee1284_epp_read_data);
EXPORT_SYMBOL(parport_ieee1284_epp_write_addr);
EXPORT_SYMBOL(parport_ieee1284_epp_read_addr);
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