mtac driver derived from mts-io 2.2.2

9 files changed, 925 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..f8e3fb5
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,2 @@
+James Maki <jmaki@multitech.com>
+John Klug <john.klug@multitech.com>
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..d60c31a
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,340 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+		    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+			    NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+		     END OF TERMS AND CONDITIONS
+
+	    How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year  name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/ChangeLog b/ChangeLog
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/ChangeLog
@@ -0,0 +1 @@
+
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1472a75
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,5 @@
+obj-m := mtac.o
+
+clean:
+	rm -f *.ko *.o
+
diff --git a/NEWS b/NEWS
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/NEWS
diff --git a/README b/README
new file mode 100644
index 0000000..867d5ff
--- /dev/null
+++ b/README
@@ -0,0 +1,9 @@
+This is the kernel module that is used to
+keep track of mtac cards installed on the
+system, and a set of functions for building
+MTAC modules.
+
+An init script can look in:
+/lib/modules/$(uname -r)/extra/mtac_*.ko
+
+to decide what to load.
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..4396685
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,13 @@
+AC_INIT([mts-io], [1.0.0])
+AM_INIT_AUTOMAKE
+AM_CONFIG_HEADER([config.h])
+
+AC_PROG_CC
+AC_PROG_CXX
+AC_PROG_INSTALL
+AC_PROG_MAKE_SET
+
+AC_HEADER_STDC
+
+AC_DEFINE([DEBUG], 0, [set to 1 to enable debug])
+
diff --git a/mtac.c b/mtac.c
new file mode 100644
index 0000000..4837ade
--- /dev/null
+++ b/mtac.c
@@ -0,0 +1,460 @@
+#define DRIVER_VERSION  "v1.0.0"
+#define DRIVER_AUTHOR   "John Klug <john.klug@multitech.com>"
+#define DRIVER_DESC "MTS driver to supervise MTAC slots"
+#define DRIVER_NAME "mtac-slots"
+/* #define DEBUG 1 */
+
+#include <linux/types.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/kmod.h>
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/mts_io.h>
+
+#include "mtac.h"
+
+/* accessory card EEPROMs, read outside of driver */
+extern uint8_t mts_ap_eeprom[NUM_AP][512];
+
+/* info for accessory port (contains function pointers for setup and teardown,
+ * gpio pin list for the device inserted into the port. */
+struct ap_info* mtac_port_info[NUM_AP];
+EXPORT_SYMBOL(mtac_port_info); /* Formerly port_info */
+
+/* Protect the mtac port info structure */
+DEFINE_MUTEX(mtac_mutex);
+EXPORT_SYMBOL(mtac_mutex);
+
+void mtac_clear_port_pins(int port_index)
+{
+    char buf[32];
+    struct gpio_pin *pin;
+    struct gpio_pin *pins;
+    
+    snprintf(buf,sizeof buf,"AP%d_",port_index+1);
+    
+    /* Find all the GPIO pins for this port and
+    * free them all.
+    */
+    log_debug("mtac_clear_port_pins: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+    mutex_lock(&mtac_mutex);
+    pins = mtac_port_info[port_index]->gpio_pins;
+    for (pin = pins; *pin->name; pin++) {
+        if (!memcmp(pin->name,buf,strlen(buf))) {
+            gpio_free(pin->pin.gpio);
+        }
+    }
+    mtac_port_info[port_index]->gpio_pins = NULL;
+    log_debug("Unlock mtac_mutex");
+    mutex_unlock(&mtac_mutex);
+}
+EXPORT_SYMBOL(mtac_clear_port_pins);
+
+void mtac_set_port_pins(int port_index, struct gpio_pin *pins, struct kobject *subdir)
+{
+        log_debug("mtac_set_port_pins: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+        mtac_port_info[port_index]->gpio_pins = pins;
+        mtac_port_info[port_index]->subdirs = subdir;
+}
+EXPORT_SYMBOL(mtac_set_port_pins);
+
+struct kobj_attribute* mtac_create_attribute(const char* _name, umode_t _mode) {
+        char* attr_name;
+        struct kobj_attribute* _attr;
+        
+        _attr = kzalloc(sizeof(struct kobj_attribute), GFP_KERNEL);
+        if (! _attr) {
+                log_error("kzalloc of attribute [%s] failed", _name);
+                return NULL;
+        }
+        sysfs_attr_init(_attr);
+        attr_name = kstrdup(_name, GFP_KERNEL);
+        if (! attr_name) {
+                log_error("GFP_KERNEL dup failed for attribute [%s]", _name);
+                return NULL;
+        }
+        _attr->attr.name = attr_name;
+        _attr->attr.mode = _mode;
+
+        return _attr;
+}
+EXPORT_SYMBOL(mtac_create_attribute);
+
+int mtac_port_from_kobject(struct kobject *kobj) {
+        int port;
+        const char *name;
+
+        name = kobj->name;
+        if (! name) {
+                log_error("kobject->name is NULL");
+                return -1;
+        }
+
+        if (sscanf(name, "ap%d", &port) < 1) {
+                log_error("failed to scan port from kobject->name [%s]", name);
+                return -1;
+        }
+
+        if (port < 1 || port > NUM_AP) {
+                log_error("port number %d is invalid", port);
+                return -1;
+        }
+
+        return port;
+}
+EXPORT_SYMBOL(mtac_port_from_kobject);
+
+
+/*
+* This function is not normally used directly by mtac modules.
+*/
+ssize_t mtac_show_product_info(struct kobject *kobj, struct kobj_attribute *attr, char *buf) {
+        ssize_t value;
+        int port;
+        int port_index;
+        struct mts_ap_eeprom_layout *app;
+
+        port = mtac_port_from_kobject(kobj);
+        if (port < 1) {
+                log_error("mtac_port_from_kobject returned %d", port);
+                return -1;
+        }
+        port_index = port - 1;
+
+        app = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index];
+        if (! strcmp(attr->attr.name, "vendor-id")) {
+                value = snprintf(buf, 32, "%s\n", app->vendor_id);
+        } else if (! strcmp(attr->attr.name, "product-id")) {
+                value = snprintf(buf, 32, "%s\n", app->product_id);
+        } else if (! strcmp(attr->attr.name, "device-id")) {
+                value = snprintf(buf, 32, "%s\n", app->device_id);
+        } else if (! strcmp(attr->attr.name, "hw-version")) {
+                value = snprintf(buf, 32, "%s\n", app->hw_version);
+        } else {
+                log_error("attribute [%s] not found", attr->attr.name);
+                value = -1;
+        }
+        return value;
+}
+EXPORT_SYMBOL(mtac_show_product_info);
+
+bool mtac_add_product_info_attributes(int port, struct attribute** attrs, int* index) {
+        char buf[32];
+        struct kobj_attribute* kobj_attr;
+
+        sprintf(buf, "vendor-id");
+        kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO);
+        if (! kobj_attr) {
+                log_error("failed to create attribute [%s] in port %d", buf, port);
+                return false;
+        }
+        kobj_attr->show = mtac_show_product_info;
+        attrs[(*index)++] = &kobj_attr->attr;
+
+        sprintf(buf, "product-id");
+        kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO);
+        if (! kobj_attr) {
+                log_error("failed to create attribute [%s] in port %d", buf, port);
+                return false;
+        }
+        kobj_attr->show = mtac_show_product_info;
+        attrs[(*index)++] = &kobj_attr->attr;
+
+        sprintf(buf, "device-id");
+        kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO);
+        if (! kobj_attr) {
+                log_error("failed to create attribute [%s] in port %d", buf, port);
+                return false;
+        }
+        kobj_attr->show = mtac_show_product_info;
+        attrs[(*index)++] = &kobj_attr->attr;
+
+        sprintf(buf, "hw-version");
+        kobj_attr = mtac_create_attribute(buf, MTS_ATTR_MODE_RO);
+        if (! kobj_attr) {
+                log_error("failed to create attribute [%s] in port %d", buf, port);
+                return false;
+        }
+        kobj_attr->show = mtac_show_product_info;
+        attrs[(*index)++] = &kobj_attr->attr;
+
+        return true;
+}
+EXPORT_SYMBOL(mtac_add_product_info_attributes);
+
+
+/*
+* This function is not normally used directly by mtac modules.
+*/
+struct gpio_pin *mtac_gpio_pin_by_attr_name(const char *name, int port) {
+        struct gpio_pin *pin;
+        char *pin_attr_name;
+        int port_index = port - 1;
+        struct gpio_pin *port_gpio_pins;
+
+        log_debug("mtac_gpio_pin_by_attr_name: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+        mutex_lock(&mtac_mutex);
+        pin_attr_name = mtac_port_info[port_index]->gpio_pin_name_by_attr_name(name, port);
+        port_gpio_pins = mtac_port_info[port_index]->gpio_pins;
+
+        for (pin = port_gpio_pins; *pin->name; pin++) {
+                if (!strcmp(pin->pin.label, pin_attr_name)) {
+                        mutex_unlock(&mtac_mutex);
+                        return pin;
+                }
+        }
+        mutex_unlock(&mtac_mutex);
+
+        log_error("pin with attr name [%s] not found", name);
+        return NULL;
+}
+EXPORT_SYMBOL(mtac_gpio_pin_by_attr_name);
+
+ssize_t mtac_attr_show_ap_gpio_pin(struct kobject *kobj,
+                        struct kobj_attribute *attr,
+                        char *buf)
+{
+    int value;
+    int port;
+    struct gpio_pin *pin;
+        
+    port = mtac_port_from_kobject(kobj);
+    if (port < 1) {
+            log_error("mtac_port_from_kobject returned %d", port);
+            return -EINVAL;
+    }
+
+    pin	= mtac_gpio_pin_by_attr_name(attr->attr.name, port);
+    if (!pin) {
+            return -ENODEV;
+    }
+
+    log_debug("mtac_attr_show_ap_gpio_pin: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+    mutex_lock(&mtac_mutex);
+
+    value = gpio_get_value(pin->pin.gpio);
+
+    mutex_unlock(&mtac_mutex);
+
+    if (value < 0) {
+            return value;
+    }
+
+    if (pin->active_low) {
+            value = !value;
+    }
+
+    return sprintf(buf, "%d\n", value);
+}
+EXPORT_SYMBOL(mtac_attr_show_ap_gpio_pin);
+
+
+ssize_t mtac_attr_store_ap_gpio_pin(struct kobject *kobj,
+                struct kobj_attribute *attr, const char *buf, size_t count)
+{
+        int value;
+        int port;
+        struct gpio_pin *pin;
+
+        port = mtac_port_from_kobject(kobj);
+        if (port < 1) {
+                log_error("mtac_port_from_kobject returned %d", port);
+                return -EINVAL;
+        }
+        
+        pin	= mtac_gpio_pin_by_attr_name(attr->attr.name, port);
+        if (!pin) {
+                return -ENODEV;
+        }
+
+        if (sscanf(buf, "%i", &value) != 1) {
+                return -EINVAL;
+        }
+
+        if (pin->active_low) {
+                value = !value;
+        }
+
+        log_debug("mtac_attr_store_ap_gpio_pin: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+        mutex_lock(&mtac_mutex);
+
+        gpio_set_value(pin->pin.gpio, value);
+
+        mutex_unlock(&mtac_mutex);
+
+        return count;
+}
+EXPORT_SYMBOL(mtac_attr_store_ap_gpio_pin);
+
+static void display_port(int port_index) {
+        int port = port_index + 1;
+        struct mts_ap_eeprom_layout *app;
+        
+
+        /* Our caller has locked the mtac_mutex */
+        if((*(int *)(&mtac_mutex.count)) != 0) {
+                log_error("Must always hold the mtac_mutex here, count is %d not 0",(*(int *)(&mtac_mutex.count)));
+        }
+
+        app = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index];
+
+        log_info("accessory card %d vendor-id: %.32s", port, app->vendor_id);
+        log_info("accessory card %d product-id: %.32s", port,  app->product_id);
+        log_info("accessory card %d device-id: %.32s", port,  app->device_id);
+        log_info("accessory card %d hw-version: %.32s", port,  app->hw_version);
+}
+
+static void acquire_gpio(struct gpio_pin *pins, int port_index)
+{
+        char buf[32];
+        struct gpio_pin *pin;
+        int ret;
+
+        snprintf(buf,sizeof buf,"AP%d_",port_index+1);
+        for (pin = pins; *pin->name; pin++) {
+                if (!memcmp(pin->name,buf,strlen(buf))) {
+                        log_debug("Request name:%s label: %s pin: %d", pin->name, pin->pin.label, pin->pin.gpio);
+                        ret = gpio_request_one(pin->pin.gpio, pin->pin.flags, pin->pin.label);
+                        if (ret)
+                                log_debug("could not request pin %s (%d) but it could have already been requested under a different pin name", pin->name, ret);
+                }
+        }
+}
+
+#include <linux/delay.h>
+
+struct gpio_pin *mtac_gpio_pin_by_name(const char *name, int port_index) {
+        struct gpio_pin *pin;
+
+        log_debug("mtac_gpio_pin_by_name: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+        mutex_lock(&mtac_mutex);
+        for (pin = mtac_port_info[port_index]->gpio_pins; *pin->name; pin++) {
+                if (!strcmp(pin->name, name)) {
+                        mutex_unlock(&mtac_mutex);
+                        return pin;
+                }
+        }
+        mutex_unlock(&mtac_mutex);
+
+        log_error("pin named %s not found", name);
+
+        return NULL;
+}
+EXPORT_SYMBOL(mtac_gpio_pin_by_name);
+
+
+/* static gpio_pins */
+// A GPIO pin number must only occur once.
+struct gpio_pin *mtac_gpio_pin_by_num(unsigned num, int port_index) {
+        int ipin = 0;
+        struct gpio_pin *port_gpio_pins;
+
+        log_debug("mtac_gpio_pin_by_num: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+        mutex_lock(&mtac_mutex);
+        port_gpio_pins = mtac_port_info[port_index]->gpio_pins;
+        while(*(port_gpio_pins[ipin].name)) {
+                if (port_gpio_pins[ipin].pin.gpio == num) {
+                        mutex_unlock(&mtac_mutex);
+                        return &(port_gpio_pins[ipin]);
+                }
+                ipin++;
+        }
+        mutex_unlock(&mtac_mutex);
+        log_error("pin numbered %u not found", num);
+
+        return NULL;
+}
+EXPORT_SYMBOL(mtac_gpio_pin_by_num);
+
+/*
+* Depends on static gpio_pins
+*/
+int mtac_find(void(*set_info)(struct ap_info* info), const char *target_product_id)
+{
+    int port_index;
+    struct mts_ap_eeprom_layout *app;
+    int slot_count = 0;
+
+    for (port_index = 0; port_index < NUM_AP; port_index++) {
+        log_debug("mtac_find: State of mtac mutex is %d",(*(int *)(&mtac_mutex.count)));
+        mutex_lock(&mtac_mutex);
+        if (mtac_port_info[port_index] != NULL) {
+            log_debug("Accessory Port %d of %d is in use",port_index+1,NUM_AP);
+            mutex_unlock(&mtac_mutex);
+            continue;
+        }
+        app = (struct mts_ap_eeprom_layout *)mts_ap_eeprom[port_index];
+        log_debug("target_product_id=%s, eeprom=%s",target_product_id,app->product_id);
+        if (mts_ap_eeprom[port_index][0] == 0xFF) {
+            log_info("uninitialized eeprom on accessory card %d", port_index);
+            mutex_unlock(&mtac_mutex);
+            continue;
+        } else if (mts_ap_eeprom[port_index][0] == 0x0) {
+            log_debug("no accessory card inserted in port %d", port_index);
+            mutex_unlock(&mtac_mutex);
+            continue;
+        } else if (strstr(app->product_id, target_product_id)) {
+            log_debug("strstr matches");
+            mtac_port_info[port_index] = kzalloc(sizeof(struct ap_info), GFP_KERNEL);
+            if (! mtac_port_info[port_index]) {
+                log_error("alloc of port info failed");
+                mutex_unlock(&mtac_mutex);
+                return -ENOSPC;
+            }
+            set_info(mtac_port_info[port_index]);
+            if (! mtac_port_info[port_index]->setup(port_index+1)) {
+                log_error("accessory port %d setup failed", port_index+1);
+                mtac_port_info[port_index]->teardown(port_index+1);
+                kfree(mtac_port_info[port_index]);
+                mtac_port_info[port_index] = NULL;
+                mutex_unlock(&mtac_mutex);
+                return -ENOSPC;
+            } else {
+                acquire_gpio(mtac_port_info[port_index]->gpio_pins,port_index);
+                slot_count++;
+                log_debug("slot_count=%d",slot_count);
+            }
+        } else
+            log_debug("len prod_id: %d eeprom pr id: %d",strlen(target_product_id),strlen(app->product_id));
+        mutex_unlock(&mtac_mutex);
+    }
+    return slot_count;
+}
+EXPORT_SYMBOL(mtac_find);
+
+/*
+* Display the EEPROM for all the slots.
+*/
+static int __init mtac_init(void)
+{
+    int port_index;
+
+    log_debug("init: " DRIVER_VERSION);
+    mutex_lock(&mtac_mutex);
+    for (port_index = 0; port_index < NUM_AP; port_index++) {
+        if (mts_ap_eeprom[port_index][0] == 0xFF)
+            log_alert("uninitialized eeprom on accessory card %d", port_index);
+        else if (mts_ap_eeprom[port_index][0] == 0x0)
+            log_info("no accessory card inserted in port %d", port_index+1);
+        else
+            display_port(port_index);
+    }
+    mutex_unlock(&mtac_mutex);
+
+    return 0;
+}
+
+/* We can only tear down our own device */
+static void __exit mtac_exit(void)
+{
+    log_info("exiting");
+}
+module_init(mtac_init);
+module_exit(mtac_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL");
diff --git a/mtac.h b/mtac.h
new file mode 100644
index 0000000..1faa104
--- /dev/null
+++ b/mtac.h
@@ -0,0 +1,95 @@
+#ifndef IO_MODULE_MTAC_H_
+#define IO_MODULE_MTAC_H_
+
+// NUM_AP should be defined from the board code
+// it should be set to the value of CONFIG_MTS_NUM_ACCESSORY_PORTS
+// arch/arm/mach-at91/board-dt-sam9.c
+// if it is 0 or undefined, there is no accessory card support on this HW
+#ifdef CONFIG_MTS_NUM_ACCESSORY_PORTS
+
+#ifndef NUM_AP
+#define NUM_AP CONFIG_MTS_NUM_ACCESSORY_PORTS
+#endif
+
+#else
+#define NUM_AP 0
+#endif
+
+
+#define PRODUCT_ID_MTAC_GPIOB			"MTAC-GPIOB"
+#define PRODUCT_ID_MTAC_MFSER			"MTAC-MFSER"
+#define PRODUCT_ID_MTAC_ETH				"MTAC-ETH"
+#define PRODUCT_ID_MTAC_LORA			"MTAC-LORA"
+#define PRODUCT_ID_MTAC_PULSE			"MTAC-PULSE"
+#define PRODUCT_ID_MTAC_XDOT			"MTAC-XDOT"
+
+
+#define DEBUG		1
+
+/* Hardware version must be fewer characters than hw_version
+   in struct mts_ap_eeprom_layout */
+/* MTAC-LORA with native SPI or FTDI FT4222 */
+#define HW_VERSION_MTAC_LORA_0_0		"MTAC-LORA-0.0"
+/* MTAC-LORA2 with FTDI FT232H */
+#define HW_VERSION_MTAC_LORA_1_0		"MTAC-LORA-1.0"
+#define HW_VERSION_MTAC_LORA_1_1		"MTAC-LORA-1.1"
+#define HW_VERSION_MTAC_LORA_1_5		"MTAC-LORA-1.5"
+/* Code assumes CRESET/CDONE (SPI programming) cases will not
+ * exactly match MTAC-LORA-0.0, 1.0, or 1.1.  Also levels before
+ * 1.5 must be the same length.
+ */
+
+enum {
+	MTAC_NONE,
+	MTAC_GPIOB_0_0,
+	MTAC_MFSER_0_0,
+	MTAC_ETH_0_0,
+	MTAC_LORA_0_0,
+	MTAC_LORA_1_0,
+	MTAC_LORA_1_1,
+	MTAC_LORA_1_5,
+    MTAC_PULSE_1_0,
+	MTAC_XDOT_0_0,
+};
+
+enum ap {
+	port_1 = 1,
+	port_2,
+};
+
+// info for accessory port
+// contains function pointers for setup and teardown and useful info
+// each type of accessory card should have one of these
+struct ap_info {
+	char  product_id[32];
+	bool (*setup)(enum ap port);
+	bool (*teardown)(enum ap port);
+	char* (*gpio_pin_name_by_attr_name)(const char* name, int port);
+	struct gpio_pin *gpio_pins;
+	struct kobject *subdirs;
+	struct attribute_group attr_group;
+};
+
+extern struct platform_device *mts_io_platform_device;
+
+extern uint8_t mts_ap_eeprom[NUM_AP][512];
+extern struct mutex mtac_mutex;
+
+extern void mtac_clear_port_pins(int port_index);
+extern void mtac_set_port_pins(int port_index, struct gpio_pin *pins, struct kobject *subdir);
+extern struct kobj_attribute* mtac_create_attribute(const char* _name, umode_t _mode);
+extern int mtac_port_from_kobject(struct kobject *kobj);
+extern ssize_t mtac_show_product_info(struct kobject *kobj, struct kobj_attribute *attr, char *buf);
+extern bool mtac_add_product_info_attributes(int port, struct attribute** attrs, int* index);
+extern struct gpio_pin *mtac_gpio_pin_by_attr_name(const char *name, int port);
+extern ssize_t mtac_attr_show_ap_gpio_pin(struct kobject *kobj,
+			struct kobj_attribute *attr,
+			char *buf);
+extern ssize_t mtac_attr_store_ap_gpio_pin(struct kobject *kobj,
+		struct kobj_attribute *attr, const char *buf, size_t count);
+extern struct gpio_pin *mtac_gpio_pin_by_num(unsigned num, int port_index);
+extern struct gpio_pin *mtac_gpio_pin_by_name(const char *name, int port_index);
+extern void mtac_clear_port_pins(int port_index);
+extern int mtac_find(void(*set_info)(struct ap_info* info), const char *target_product_id);
+extern struct ap_info *mtac_port_info[];
+#endif /* IO_MODULE_MTAC_H_ */