isa module added, some bugfixes

'isa.o' is roughly what was called 'sensor.o' in doc/design.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@12 7894878c-1315-0410-8ee3-d5d059ff63e0

doc/design

@@ -7,6 +7,8 @@ Document version 1.0, 19981101.
                  1.1, 19981111.
                  1.2, 19981118.
 
+--> Never, ever change the driver struct with this technique! 
+
 
 Object oriented approach
 ========================
@@ -168,7 +170,7 @@ included in kernels around 1.2.120!).
 A driver
 --------
 
-struct sensor_driver {
+struct i2c_driver {
   char name[32];
   int id;
   unsigned int flags;

kernel/Module.mk

@@ -22,7 +22,7 @@ MODULE_DIR := src
 
 # Regrettably, even 'simply expanded variables' will not put their currently
 # defined value verbatim into the command-list of rules...
-SRCTARGETS := $(MODULE_DIR)/smbus.o $(MODULE_DIR)/piix4.o
+SRCTARGETS := $(MODULE_DIR)/smbus.o $(MODULE_DIR)/piix4.o $(MODULE_DIR)/isa.o
 
 # Include all dependency files
 INCLUDEFILES += $(SRCTARGETS:.o=.d)

kernel/busses/i2c-isa.c

@@ -0,0 +1,191 @@
+/*
+    isa.c - A Linux module for reading sensor data.
+    Copyright (c) 1998  Frodo Looijaard <frodol@dds.nl> 
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* This implements an i2c algorithm/adapter for ISA bus. Not that this is
+   on first sight very useful; almost no functionality is preserved.
+   Except that it makes writing drivers for chips which can be on both
+   the SMBus and the ISA bus very much easier. See lm78.c for an example
+   of this. */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include "i2c.h"
+#ifdef SPINLOCK
+#include <asm/spinlock.h>
+#else
+#include <asm/semaphore.h>
+#endif
+
+#include "version.h"
+#include "isa.h"
+
+static int isa_master_xfer (struct isa_adapter *adap,
+                            struct i2c_msg msgs[], int num);
+static int isa_slave_send (struct isa_adapter *adap, char *data, int len);
+static int isa_slave_recv (struct isa_adapter *adap, char *data, int len);
+static int isa_algo_control (struct isa_adapter *adap, unsigned int cmd,
+                             unsigned long arg);
+static int isa_client_register (struct isa_client *client);
+static int isa_client_unregister (struct isa_client *client);
+
+static int isa_init(void);
+static int isa_cleanup(void);
+
+#ifdef MODULE
+extern int init_module(void);
+extern int cleanup_module(void);
+#endif /* MODULE */
+
+/* This is the actual algorithm we define */
+static struct isa_algorithm isa_algorithm = {
+  /* name */            "ISA bus adapter",
+  /* id */              ALGO_ISA,
+  /* master_xfer */     &isa_master_xfer,
+  /* slave_send */      &isa_slave_send,
+  /* slave_rcv */       &isa_slave_recv,
+  /* algo_control */    &isa_algo_control,
+  /* client_register */ &isa_client_register,
+  /* client_unregister*/&isa_client_unregister
+};
+
+/* There can only be one... */
+static struct isa_adapter isa_adapter;
+
+/* Used in isa_init/cleanup */
+static int isa_initialized;
+
+/* Algorithm master_xfer call-back implementation. Can't do that... */
+int isa_master_xfer (struct isa_adapter *adap, struct i2c_msg msgs[],
+                     int num)
+{
+  printk("isa_master_xfer called for adapter `%s' "
+         "(no i2c level access possible!)\n",
+         adap->name);
+  return 0;
+}
+
+/* Algorithm slave_send call-back implementation. Can't do that... */
+int isa_slave_send (struct isa_adapter *adap, char *data, int len)
+{
+  printk("isa_slave_send called for adapter `%s' "
+         "(no i2c level access possible!)\n",
+         adap->name);
+  return 0;
+}
+
+/* Algorithm slave_recv call-back implementation. Can't do that... */
+int isa_slave_recv (struct isa_adapter *adap, char *data, int len)
+{
+  printk("isa_slave_recv called for adapter `%s' "
+         "(no i2c level access possible!)\n",
+         adap->name);
+  return 0;
+}
+
+/* Here we can put additional calls to modify the workings of the algorithm.
+   But right now, there is no need for that. */
+int isa_algo_control (struct isa_adapter *adap, unsigned int cmd,
+                       unsigned long arg)
+{
+  return 0;
+}
+
+/* Ehm... This is called when a client is registered to an adapter. We could
+   do all kinds of neat stuff here like, ehm - returning success? */
+int isa_client_register (struct isa_client *client)
+{
+  return 0;
+}
+
+int isa_client_unregister (struct isa_client *client)
+{
+  return 0;
+}
+
+int isa_init(void)
+{
+  int res;
+  printk("isa.o version %s (%s)\n",LM_VERSION,LM_DATE);
+#ifdef DEBUG
+  if (isa_initialized) {
+    printk("isa.o: Oops, isa_init called a second time!\n");
+    return -EBUSY;
+  }
+#endif
+  isa_initialized = 0;
+  if ((res = isa_add_algorithm(&isa_algorithm))) {
+    printk("isa.o: Algorithm registration failed, module isa.o not inserted\n");
+    isa_cleanup();
+    return res;
+  }
+  isa_initialized++;
+  strcpy(isa_adapter.name,"ISA main adapter");
+  isa_adapter.id = ALGO_ISA | ISA_MAIN;
+  isa_adapter.algo = &isa_algorithm;
+  if ((res = isa_add_adapter(&isa_adapter))) {
+    printk("isa.o: Adapter registration failed, "
+           "module isa.o is not inserted\n");
+    isa_cleanup();
+    return res;
+  }
+  isa_initialized++;
+  printk("isa.o: ISA bus access for i2c modules initialized\n");
+  return 0;
+}
+
+int isa_cleanup(void)
+{
+  int res;
+  if (isa_initialized >= 2)
+  {
+    if ((res = isa_del_adapter(&isa_adapter))) {
+      printk("isa.o: isa_del_adapter failed, module not removed\n");
+      return res;
+    } else
+      isa_initialized--;
+  }
+  if (isa_initialized >= 1)
+  {
+    if ((res = isa_del_algorithm(&isa_algorithm))) {
+      printk("isa.o: isa_del_algorithm failed, module not removed\n");
+      return res;
+    } else
+      isa_initialized--;
+  }
+  return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
+MODULE_DESCRIPTION("ISA bus access through i2c");
+
+int init_module(void)
+{
+  return isa_init();
+}
+
+int cleanup_module(void)
+{
+  return isa_cleanup();
+}
+
+#endif /* MODULE */
+

kernel/include/i2c-isa.h

@@ -0,0 +1,153 @@
+/*
+    isa.h - A Linux module for reading sensor data.
+    Copyright (c) 1998  Frodo Looijaard <frodol@dds.nl>
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef SENSORS_SENSOR_H
+#define SENSORS_SENSOR_H
+
+/* This file must interface with Simon Vogl's i2c driver. Version 19981006 is
+   OK, earlier versions are not; later versions will probably give problems
+   too. 
+*/
+#ifdef I2C
+#include "i2c/i2c.h"
+#else /* def I2C */
+#include <linux/i2c.h>
+#endif /* def I2C */
+
+#include <asm/types.h>
+
+/* SPINLOCK is defined in i2c.h. */
+#ifdef SPINLOCK
+#include <asm/spinlock.h>
+#else
+#include <asm/semaphore.h>
+#endif
+
+#include "isa.h"
+
+/* Note that this driver is *not* built upon smbus.c, but is parallel to it.
+   We do not need SMBus facilities if we are on the ISA bus, after all */
+
+/* Declarations, to keep the compiler happy */
+struct isa_driver;
+struct isa_client;
+struct isa_algorithm;
+struct isa_adapter;
+
+/* A driver tells us how we should handle a specific kind of chip.
+   A specific instance of such a chip is called a client.  
+   This structure is essentially the same as i2c_driver. */
+struct isa_driver {
+  char name[32];
+  int id;
+  unsigned int flags;
+  int (* attach_adapter) (struct isa_adapter *);
+  int (* detach_client) (struct isa_client *);
+  int (* command) (struct isa_client *, unsigned int cmd, void *arg);
+  void (* inc_use) (struct isa_client *);
+  void (* dec_use) (struct isa_client *);
+};
+
+/* A client is a specifc instance of a chip: for each detected chip, there will
+   be a client. Its operation is controlled by a driver.
+   This structure is an extension of i2c_client. */
+struct isa_client {
+  char name[32];
+  int id;
+  unsigned int flags;
+  unsigned char addr;
+  struct isa_adapter *adapter;
+  struct isa_driver *driver;
+  void *data;
+
+  /* Here ended i2c_client */
+  unsigned int full_address;
+};
+
+/* An algorithm describes how a certain class of busses can be accessed.
+   A specific instance of sucj a bus is called an adapter.
+   This structure is essentially the same as i2c_adapter. */
+struct isa_algorithm {
+  char name[32];
+  unsigned int id;
+  int (* master_xfer) (struct isa_adapter *adap, struct i2c_msg msgs[],
+                       int num);
+  int (* slave_send) (struct isa_adapter *,char *, int);
+  int (* slave_recv) (struct isa_adapter *,char *, int);
+  int (* algo_control) (struct isa_adapter *, unsigned int, unsigned long);
+  int (* client_register) (struct isa_client *);
+  int (* client_unregister) (struct isa_client *);
+};
+
+/* An adapter is a specifc instance of a bus: for each detected bus, there will
+   be an adapter. Its operation is controlled by an algorithm.
+   SPINLOCK must be the same as declared in i2c.h.
+   This structure is essentially the same as i2c_algorithm. */
+struct isa_adapter {
+  char name[32];
+  unsigned int id;
+  struct isa_algorithm *algo;
+  void *data;
+#ifdef SPINLOCK
+  spinlock_t lock;
+  unsigned long lockflags;
+#else
+  struct semaphore lock;
+#endif
+  unsigned int flags;
+  struct isa_client *clients[I2C_CLIENT_MAX];
+  int client_count;
+  int timeout;
+  int retries;
+};
+
+/* We need to mark ISA algorithms in the algorithm structure. */
+#define ALGO_ISA 0x50000
+
+/* ISA Adapter ids */
+#define ISA_MAIN 1
+
+/* Detect whether we are on the isa bus. If this returns true, all i2c
+  access will fail! */
+#define i2c_is_isa_client(clientptr) \
+        ((clientptr)->adapter->algo->id == ALGO_ISA)
+
+/* Next: define ISA variants of registering. */
+#define isa_add_algorithm(algoptr) \
+        i2c_add_algorithm((struct i2c_algorithm *) (algoptr))
+#define isa_del_algorithm(algoptr) \
+        i2c_del_algorithm((struct i2c_algorithm *) (algoptr))
+
+#define isa_add_adapter(adapptr) \
+        i2c_add_adapter((struct i2c_adapter *) (adapptr))
+#define isa_del_adapter(adapptr) \
+        i2c_del_adapter((struct i2c_adapter *) (adapptr))
+
+#define isa_add_driver(driverptr) \
+        i2c_add_driver((struct i2c_driver *) (driverptr))
+#define isa_del_driver(driverptr) \
+        i2c_add_driver((struct i2c_driver *) (driverptr))
+
+#define isa_attach_client(clientptr) \
+        i2c_attach_client((struct i2c_client *) (clientptr))
+#define isa_detach_client(clientptr) \
+        i2c_detach_client((struct i2c_client *) (clientptr))
+
+
+#endif /* ndef SENSORS_ISA_H */

kernel/include/isa.h

@@ -0,0 +1,153 @@
+/*
+    isa.h - A Linux module for reading sensor data.
+    Copyright (c) 1998  Frodo Looijaard <frodol@dds.nl>
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef SENSORS_SENSOR_H
+#define SENSORS_SENSOR_H
+
+/* This file must interface with Simon Vogl's i2c driver. Version 19981006 is
+   OK, earlier versions are not; later versions will probably give problems
+   too. 
+*/
+#ifdef I2C
+#include "i2c/i2c.h"
+#else /* def I2C */
+#include <linux/i2c.h>
+#endif /* def I2C */
+
+#include <asm/types.h>
+
+/* SPINLOCK is defined in i2c.h. */
+#ifdef SPINLOCK
+#include <asm/spinlock.h>
+#else
+#include <asm/semaphore.h>
+#endif
+
+#include "isa.h"
+
+/* Note that this driver is *not* built upon smbus.c, but is parallel to it.
+   We do not need SMBus facilities if we are on the ISA bus, after all */
+
+/* Declarations, to keep the compiler happy */
+struct isa_driver;
+struct isa_client;
+struct isa_algorithm;
+struct isa_adapter;
+
+/* A driver tells us how we should handle a specific kind of chip.
+   A specific instance of such a chip is called a client.  
+   This structure is essentially the same as i2c_driver. */
+struct isa_driver {
+  char name[32];
+  int id;
+  unsigned int flags;
+  int (* attach_adapter) (struct isa_adapter *);
+  int (* detach_client) (struct isa_client *);
+  int (* command) (struct isa_client *, unsigned int cmd, void *arg);
+  void (* inc_use) (struct isa_client *);
+  void (* dec_use) (struct isa_client *);
+};
+
+/* A client is a specifc instance of a chip: for each detected chip, there will
+   be a client. Its operation is controlled by a driver.
+   This structure is an extension of i2c_client. */
+struct isa_client {
+  char name[32];
+  int id;
+  unsigned int flags;
+  unsigned char addr;
+  struct isa_adapter *adapter;
+  struct isa_driver *driver;
+  void *data;
+
+  /* Here ended i2c_client */
+  unsigned int full_address;
+};
+
+/* An algorithm describes how a certain class of busses can be accessed.
+   A specific instance of sucj a bus is called an adapter.
+   This structure is essentially the same as i2c_adapter. */
+struct isa_algorithm {
+  char name[32];
+  unsigned int id;
+  int (* master_xfer) (struct isa_adapter *adap, struct i2c_msg msgs[],
+                       int num);
+  int (* slave_send) (struct isa_adapter *,char *, int);
+  int (* slave_recv) (struct isa_adapter *,char *, int);
+  int (* algo_control) (struct isa_adapter *, unsigned int, unsigned long);
+  int (* client_register) (struct isa_client *);
+  int (* client_unregister) (struct isa_client *);
+};
+
+/* An adapter is a specifc instance of a bus: for each detected bus, there will
+   be an adapter. Its operation is controlled by an algorithm.
+   SPINLOCK must be the same as declared in i2c.h.
+   This structure is essentially the same as i2c_algorithm. */
+struct isa_adapter {
+  char name[32];
+  unsigned int id;
+  struct isa_algorithm *algo;
+  void *data;
+#ifdef SPINLOCK
+  spinlock_t lock;
+  unsigned long lockflags;
+#else
+  struct semaphore lock;
+#endif
+  unsigned int flags;
+  struct isa_client *clients[I2C_CLIENT_MAX];
+  int client_count;
+  int timeout;
+  int retries;
+};
+
+/* We need to mark ISA algorithms in the algorithm structure. */
+#define ALGO_ISA 0x50000
+
+/* ISA Adapter ids */
+#define ISA_MAIN 1
+
+/* Detect whether we are on the isa bus. If this returns true, all i2c
+  access will fail! */
+#define i2c_is_isa_client(clientptr) \
+        ((clientptr)->adapter->algo->id == ALGO_ISA)
+
+/* Next: define ISA variants of registering. */
+#define isa_add_algorithm(algoptr) \
+        i2c_add_algorithm((struct i2c_algorithm *) (algoptr))
+#define isa_del_algorithm(algoptr) \
+        i2c_del_algorithm((struct i2c_algorithm *) (algoptr))
+
+#define isa_add_adapter(adapptr) \
+        i2c_add_adapter((struct i2c_adapter *) (adapptr))
+#define isa_del_adapter(adapptr) \
+        i2c_del_adapter((struct i2c_adapter *) (adapptr))
+
+#define isa_add_driver(driverptr) \
+        i2c_add_driver((struct i2c_driver *) (driverptr))
+#define isa_del_driver(driverptr) \
+        i2c_add_driver((struct i2c_driver *) (driverptr))
+
+#define isa_attach_client(clientptr) \
+        i2c_attach_client((struct i2c_client *) (clientptr))
+#define isa_detach_client(clientptr) \
+        i2c_detach_client((struct i2c_client *) (clientptr))
+
+
+#endif /* ndef SENSORS_ISA_H */

kernel/include/smbus.h

@@ -124,6 +124,13 @@ struct smbus_adapter {
 /* SMBus Adapter ids */
 #define SMBUS_PIIX4 1
 
+/* Detect whether we are on an SMBus-only bus. Note that if this returns
+   false, you can still use the smbus access routines, as these emulate
+   the SMBus on I2C. Unless they are undefined on your algorithm, of
+   course. */
+#define i2c_is_smbus_client(clientptr) \
+        ((clientptr)->adapter->algo->id == ALGO_SMBUS)
+
 /* This union is used within smbus_access routines */
 union smbus_data { 
         u8 byte;
@@ -255,18 +262,28 @@ extern inline int smbus_write_block_data(struct smbus_adapter * adapter,
   return smbus_access(adapter,addr,SMBUS_WRITE,command,SMBUS_BLOCK_DATA,&data);
 }
 
+
 /* Next: define SMBus variants of registering. */
-extern int smbus_add_algorithm(struct smbus_algorithm *algorithm);
-extern int smbus_del_algorithm(struct smbus_algorithm *algorithm);
 
-extern int smbus_add_adapter(struct smbus_adapter *adapter);
-extern int smbus_del_adapter(struct smbus_adapter *adapter);
+#define smbus_add_algorithm(algoptr) \
+	i2c_add_algorithm((struct i2c_algorithm *) (algoptr))
+#define smbus_del_algorithm(algoptr) \
+	i2c_del_algorithm((struct i2c_algorithm *) (algoptr))
 
-extern int smbus_add_driver(struct smbus_driver *driver);
-extern int smbus_del_driver(struct smbus_driver *driver);
+#define smbus_add_adapter(adapptr) \
+	i2c_add_adapter((struct i2c_adapter *) (adapptr))
+#define smbus_del_adapter(adapptr) \
+	i2c_del_adapter((struct i2c_adapter *) (adapptr))
 
-extern int smbus_attach_client(struct smbus_client *client);
-extern int smbus_detach_client(struct smbus_client *client);
+#define smbus_add_driver(driverptr) \
+	i2c_add_driver((struct i2c_driver *) (driverptr))
+#define smbus_del_driver(driverptr) \
+	i2c_add_driver((struct i2c_driver *) (driverptr))
+
+#define smbus_attach_client(clientptr) \
+	i2c_attach_client((struct i2c_client *) (clientptr))
+#define smbus_detach_client(clientptr) \
+	i2c_detach_client((struct i2c_client *) (clientptr))
 
 
 #endif /* ndef SENSORS_SMBUS_H */

kernel/smbus.c

@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 
+#include "i2c.h"
 #ifdef SPINLOCK
 #include <asm/spinlock.h>
 #else
@@ -156,49 +157,6 @@ int smbus_client_unregister (struct smbus_client *client)
   return 0;
 }
 
-/* Next: define SMBus variants of registering. Very boring. To make it possible
-   to change these definitions in the future without recompiling all modules,
-   we do not define them as inline. */
-int smbus_add_algorithm(struct smbus_algorithm *algorithm)
-{
-  return i2c_add_algorithm( (struct i2c_algorithm *) algorithm);
-}
-
-int smbus_del_algorithm(struct smbus_algorithm *algorithm)
-{
-  return i2c_del_algorithm( (struct i2c_algorithm *) algorithm);
-}
-
-int smbus_add_adapter(struct smbus_adapter *adapter)
-{
-  return i2c_add_adapter( (struct i2c_adapter *) adapter);
-}
-
-int smbus_del_adapter(struct smbus_adapter *adapter)
-{
-  return i2c_del_adapter( (struct i2c_adapter *) adapter);
-}
-
-int smbus_add_driver(struct smbus_driver *driver)
-{
-  return i2c_add_driver( (struct i2c_driver *) driver);
-}
-
-int smbus_del_driver(struct smbus_driver *driver)
-{
-  return i2c_del_driver( (struct i2c_driver *) driver);
-}
-
-int smbus_attach_client(struct smbus_client *client)
-{
-  return i2c_attach_client( (struct i2c_client *) client);
-}
-
-int smbus_detach_client(struct smbus_client *client)
-{
-  return i2c_detach_client( (struct i2c_client *) client);
-}
-
 int smbus_init(void)
 {
   int res;

src/Module.mk

@@ -22,7 +22,7 @@ MODULE_DIR := src
 
 # Regrettably, even 'simply expanded variables' will not put their currently
 # defined value verbatim into the command-list of rules...
-SRCTARGETS := $(MODULE_DIR)/smbus.o $(MODULE_DIR)/piix4.o
+SRCTARGETS := $(MODULE_DIR)/smbus.o $(MODULE_DIR)/piix4.o $(MODULE_DIR)/isa.o
 
 # Include all dependency files
 INCLUDEFILES += $(SRCTARGETS:.o=.d)

src/isa.c

@@ -0,0 +1,191 @@
+/*
+    isa.c - A Linux module for reading sensor data.
+    Copyright (c) 1998  Frodo Looijaard <frodol@dds.nl> 
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+/* This implements an i2c algorithm/adapter for ISA bus. Not that this is
+   on first sight very useful; almost no functionality is preserved.
+   Except that it makes writing drivers for chips which can be on both
+   the SMBus and the ISA bus very much easier. See lm78.c for an example
+   of this. */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include "i2c.h"
+#ifdef SPINLOCK
+#include <asm/spinlock.h>
+#else
+#include <asm/semaphore.h>
+#endif
+
+#include "version.h"
+#include "isa.h"
+
+static int isa_master_xfer (struct isa_adapter *adap,
+                            struct i2c_msg msgs[], int num);
+static int isa_slave_send (struct isa_adapter *adap, char *data, int len);
+static int isa_slave_recv (struct isa_adapter *adap, char *data, int len);
+static int isa_algo_control (struct isa_adapter *adap, unsigned int cmd,
+                             unsigned long arg);
+static int isa_client_register (struct isa_client *client);
+static int isa_client_unregister (struct isa_client *client);
+
+static int isa_init(void);
+static int isa_cleanup(void);
+
+#ifdef MODULE
+extern int init_module(void);
+extern int cleanup_module(void);
+#endif /* MODULE */
+
+/* This is the actual algorithm we define */
+static struct isa_algorithm isa_algorithm = {
+  /* name */            "ISA bus adapter",
+  /* id */              ALGO_ISA,
+  /* master_xfer */     &isa_master_xfer,
+  /* slave_send */      &isa_slave_send,
+  /* slave_rcv */       &isa_slave_recv,
+  /* algo_control */    &isa_algo_control,
+  /* client_register */ &isa_client_register,
+  /* client_unregister*/&isa_client_unregister
+};
+
+/* There can only be one... */
+static struct isa_adapter isa_adapter;
+
+/* Used in isa_init/cleanup */
+static int isa_initialized;
+
+/* Algorithm master_xfer call-back implementation. Can't do that... */
+int isa_master_xfer (struct isa_adapter *adap, struct i2c_msg msgs[],
+                     int num)
+{
+  printk("isa_master_xfer called for adapter `%s' "
+         "(no i2c level access possible!)\n",
+         adap->name);
+  return 0;
+}
+
+/* Algorithm slave_send call-back implementation. Can't do that... */
+int isa_slave_send (struct isa_adapter *adap, char *data, int len)
+{
+  printk("isa_slave_send called for adapter `%s' "
+         "(no i2c level access possible!)\n",
+         adap->name);
+  return 0;
+}
+
+/* Algorithm slave_recv call-back implementation. Can't do that... */
+int isa_slave_recv (struct isa_adapter *adap, char *data, int len)
+{
+  printk("isa_slave_recv called for adapter `%s' "
+         "(no i2c level access possible!)\n",
+         adap->name);
+  return 0;
+}
+
+/* Here we can put additional calls to modify the workings of the algorithm.
+   But right now, there is no need for that. */
+int isa_algo_control (struct isa_adapter *adap, unsigned int cmd,
+                       unsigned long arg)
+{
+  return 0;
+}
+
+/* Ehm... This is called when a client is registered to an adapter. We could
+   do all kinds of neat stuff here like, ehm - returning success? */
+int isa_client_register (struct isa_client *client)
+{
+  return 0;
+}
+
+int isa_client_unregister (struct isa_client *client)
+{
+  return 0;
+}
+
+int isa_init(void)
+{
+  int res;
+  printk("isa.o version %s (%s)\n",LM_VERSION,LM_DATE);
+#ifdef DEBUG
+  if (isa_initialized) {
+    printk("isa.o: Oops, isa_init called a second time!\n");
+    return -EBUSY;
+  }
+#endif
+  isa_initialized = 0;
+  if ((res = isa_add_algorithm(&isa_algorithm))) {
+    printk("isa.o: Algorithm registration failed, module isa.o not inserted\n");
+    isa_cleanup();
+    return res;
+  }
+  isa_initialized++;
+  strcpy(isa_adapter.name,"ISA main adapter");
+  isa_adapter.id = ALGO_ISA | ISA_MAIN;
+  isa_adapter.algo = &isa_algorithm;
+  if ((res = isa_add_adapter(&isa_adapter))) {
+    printk("isa.o: Adapter registration failed, "
+           "module isa.o is not inserted\n");
+    isa_cleanup();
+    return res;
+  }
+  isa_initialized++;
+  printk("isa.o: ISA bus access for i2c modules initialized\n");
+  return 0;
+}
+
+int isa_cleanup(void)
+{
+  int res;
+  if (isa_initialized >= 2)
+  {
+    if ((res = isa_del_adapter(&isa_adapter))) {
+      printk("isa.o: isa_del_adapter failed, module not removed\n");
+      return res;
+    } else
+      isa_initialized--;
+  }
+  if (isa_initialized >= 1)
+  {
+    if ((res = isa_del_algorithm(&isa_algorithm))) {
+      printk("isa.o: isa_del_algorithm failed, module not removed\n");
+      return res;
+    } else
+      isa_initialized--;
+  }
+  return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
+MODULE_DESCRIPTION("ISA bus access through i2c");
+
+int init_module(void)
+{
+  return isa_init();
+}
+
+int cleanup_module(void)
+{
+  return isa_cleanup();
+}
+
+#endif /* MODULE */
+

src/isa.h

@@ -0,0 +1,153 @@
+/*
+    isa.h - A Linux module for reading sensor data.
+    Copyright (c) 1998  Frodo Looijaard <frodol@dds.nl>
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef SENSORS_SENSOR_H
+#define SENSORS_SENSOR_H
+
+/* This file must interface with Simon Vogl's i2c driver. Version 19981006 is
+   OK, earlier versions are not; later versions will probably give problems
+   too. 
+*/
+#ifdef I2C
+#include "i2c/i2c.h"
+#else /* def I2C */
+#include <linux/i2c.h>
+#endif /* def I2C */
+
+#include <asm/types.h>
+
+/* SPINLOCK is defined in i2c.h. */
+#ifdef SPINLOCK
+#include <asm/spinlock.h>
+#else
+#include <asm/semaphore.h>
+#endif
+
+#include "isa.h"
+
+/* Note that this driver is *not* built upon smbus.c, but is parallel to it.
+   We do not need SMBus facilities if we are on the ISA bus, after all */
+
+/* Declarations, to keep the compiler happy */
+struct isa_driver;
+struct isa_client;
+struct isa_algorithm;
+struct isa_adapter;
+
+/* A driver tells us how we should handle a specific kind of chip.
+   A specific instance of such a chip is called a client.  
+   This structure is essentially the same as i2c_driver. */
+struct isa_driver {
+  char name[32];
+  int id;
+  unsigned int flags;
+  int (* attach_adapter) (struct isa_adapter *);
+  int (* detach_client) (struct isa_client *);
+  int (* command) (struct isa_client *, unsigned int cmd, void *arg);
+  void (* inc_use) (struct isa_client *);
+  void (* dec_use) (struct isa_client *);
+};
+
+/* A client is a specifc instance of a chip: for each detected chip, there will
+   be a client. Its operation is controlled by a driver.
+   This structure is an extension of i2c_client. */
+struct isa_client {
+  char name[32];
+  int id;
+  unsigned int flags;
+  unsigned char addr;
+  struct isa_adapter *adapter;
+  struct isa_driver *driver;
+  void *data;
+
+  /* Here ended i2c_client */
+  unsigned int full_address;
+};
+
+/* An algorithm describes how a certain class of busses can be accessed.
+   A specific instance of sucj a bus is called an adapter.
+   This structure is essentially the same as i2c_adapter. */
+struct isa_algorithm {
+  char name[32];
+  unsigned int id;
+  int (* master_xfer) (struct isa_adapter *adap, struct i2c_msg msgs[],
+                       int num);
+  int (* slave_send) (struct isa_adapter *,char *, int);
+  int (* slave_recv) (struct isa_adapter *,char *, int);
+  int (* algo_control) (struct isa_adapter *, unsigned int, unsigned long);
+  int (* client_register) (struct isa_client *);
+  int (* client_unregister) (struct isa_client *);
+};
+
+/* An adapter is a specifc instance of a bus: for each detected bus, there will
+   be an adapter. Its operation is controlled by an algorithm.
+   SPINLOCK must be the same as declared in i2c.h.
+   This structure is essentially the same as i2c_algorithm. */
+struct isa_adapter {
+  char name[32];
+  unsigned int id;
+  struct isa_algorithm *algo;
+  void *data;
+#ifdef SPINLOCK
+  spinlock_t lock;
+  unsigned long lockflags;
+#else
+  struct semaphore lock;
+#endif
+  unsigned int flags;
+  struct isa_client *clients[I2C_CLIENT_MAX];
+  int client_count;
+  int timeout;
+  int retries;
+};
+
+/* We need to mark ISA algorithms in the algorithm structure. */
+#define ALGO_ISA 0x50000
+
+/* ISA Adapter ids */
+#define ISA_MAIN 1
+
+/* Detect whether we are on the isa bus. If this returns true, all i2c
+  access will fail! */
+#define i2c_is_isa_client(clientptr) \
+        ((clientptr)->adapter->algo->id == ALGO_ISA)
+
+/* Next: define ISA variants of registering. */
+#define isa_add_algorithm(algoptr) \
+        i2c_add_algorithm((struct i2c_algorithm *) (algoptr))
+#define isa_del_algorithm(algoptr) \
+        i2c_del_algorithm((struct i2c_algorithm *) (algoptr))
+
+#define isa_add_adapter(adapptr) \
+        i2c_add_adapter((struct i2c_adapter *) (adapptr))
+#define isa_del_adapter(adapptr) \
+        i2c_del_adapter((struct i2c_adapter *) (adapptr))
+
+#define isa_add_driver(driverptr) \
+        i2c_add_driver((struct i2c_driver *) (driverptr))
+#define isa_del_driver(driverptr) \
+        i2c_add_driver((struct i2c_driver *) (driverptr))
+
+#define isa_attach_client(clientptr) \
+        i2c_attach_client((struct i2c_client *) (clientptr))
+#define isa_detach_client(clientptr) \
+        i2c_detach_client((struct i2c_client *) (clientptr))
+
+
+#endif /* ndef SENSORS_ISA_H */

src/smbus.c

@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 
+#include "i2c.h"
 #ifdef SPINLOCK
 #include <asm/spinlock.h>
 #else
@@ -156,49 +157,6 @@ int smbus_client_unregister (struct smbus_client *client)
   return 0;
 }
 
-/* Next: define SMBus variants of registering. Very boring. To make it possible
-   to change these definitions in the future without recompiling all modules,
-   we do not define them as inline. */
-int smbus_add_algorithm(struct smbus_algorithm *algorithm)
-{
-  return i2c_add_algorithm( (struct i2c_algorithm *) algorithm);
-}
-
-int smbus_del_algorithm(struct smbus_algorithm *algorithm)
-{
-  return i2c_del_algorithm( (struct i2c_algorithm *) algorithm);
-}
-
-int smbus_add_adapter(struct smbus_adapter *adapter)
-{
-  return i2c_add_adapter( (struct i2c_adapter *) adapter);
-}
-
-int smbus_del_adapter(struct smbus_adapter *adapter)
-{
-  return i2c_del_adapter( (struct i2c_adapter *) adapter);
-}
-
-int smbus_add_driver(struct smbus_driver *driver)
-{
-  return i2c_add_driver( (struct i2c_driver *) driver);
-}
-
-int smbus_del_driver(struct smbus_driver *driver)
-{
-  return i2c_del_driver( (struct i2c_driver *) driver);
-}
-
-int smbus_attach_client(struct smbus_client *client)
-{
-  return i2c_attach_client( (struct i2c_client *) client);
-}
-
-int smbus_detach_client(struct smbus_client *client)
-{
-  return i2c_detach_client( (struct i2c_client *) client);
-}
-
 int smbus_init(void)
 {
   int res;

src/smbus.h

@@ -124,6 +124,13 @@ struct smbus_adapter {
 /* SMBus Adapter ids */
 #define SMBUS_PIIX4 1
 
+/* Detect whether we are on an SMBus-only bus. Note that if this returns
+   false, you can still use the smbus access routines, as these emulate
+   the SMBus on I2C. Unless they are undefined on your algorithm, of
+   course. */
+#define i2c_is_smbus_client(clientptr) \
+        ((clientptr)->adapter->algo->id == ALGO_SMBUS)
+
 /* This union is used within smbus_access routines */
 union smbus_data { 
         u8 byte;
@@ -255,18 +262,28 @@ extern inline int smbus_write_block_data(struct smbus_adapter * adapter,
   return smbus_access(adapter,addr,SMBUS_WRITE,command,SMBUS_BLOCK_DATA,&data);
 }
 
+
 /* Next: define SMBus variants of registering. */
-extern int smbus_add_algorithm(struct smbus_algorithm *algorithm);
-extern int smbus_del_algorithm(struct smbus_algorithm *algorithm);
 
-extern int smbus_add_adapter(struct smbus_adapter *adapter);
-extern int smbus_del_adapter(struct smbus_adapter *adapter);
+#define smbus_add_algorithm(algoptr) \
+	i2c_add_algorithm((struct i2c_algorithm *) (algoptr))
+#define smbus_del_algorithm(algoptr) \
+	i2c_del_algorithm((struct i2c_algorithm *) (algoptr))
 
-extern int smbus_add_driver(struct smbus_driver *driver);
-extern int smbus_del_driver(struct smbus_driver *driver);
+#define smbus_add_adapter(adapptr) \
+	i2c_add_adapter((struct i2c_adapter *) (adapptr))
+#define smbus_del_adapter(adapptr) \
+	i2c_del_adapter((struct i2c_adapter *) (adapptr))
 
-extern int smbus_attach_client(struct smbus_client *client);
-extern int smbus_detach_client(struct smbus_client *client);
+#define smbus_add_driver(driverptr) \
+	i2c_add_driver((struct i2c_driver *) (driverptr))
+#define smbus_del_driver(driverptr) \
+	i2c_add_driver((struct i2c_driver *) (driverptr))
+
+#define smbus_attach_client(clientptr) \
+	i2c_attach_client((struct i2c_client *) (clientptr))
+#define smbus_detach_client(clientptr) \
+	i2c_detach_client((struct i2c_client *) (clientptr))
 
 
 #endif /* ndef SENSORS_SMBUS_H */

version.h

@@ -1,2 +1,2 @@
-#define LM_DATE "19981103"
-#define LM_VERSION "2.0.0pre0"
+#define LM_DATE "19981122"
+#define LM_VERSION "2.0.0pre1"