hwmon: (lm78) Make ISA interface depend on CONFIG_ISA

We should only include support for the ISA interface of the LM78/LM79
if CONFIG_ISA is set. Not only this makes the driver somewhat smaller
on most architectures, but this also avoids poking at random I/O
ports on these architectures.

This is very similiar to what was done for the w83781d driver in
October 2008.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Dean Nelson <dnelson@redhat.com>

1 files changed, 79 insertions, 19 deletions

diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
index 5b7c69570619..05290e34a1be 100644
--- a/drivers/hwmon/lm78.c
+++ b/drivers/hwmon/lm78.c
@@ -2,7 +2,7 @@
     lm78.c - Part of lm_sensors, Linux kernel modules for hardware
              monitoring
     Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> 
-    Copyright (c) 2007        Jean Delvare <khali@linux-fr.org>
+    Copyright (c) 2007, 2011  Jean Delvare <khali@linux-fr.org>
 
     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
@@ -26,23 +26,21 @@
 #include <linux/slab.h>
 #include <linux/jiffies.h>
 #include <linux/i2c.h>
-#include <linux/platform_device.h>
-#include <linux/ioport.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-vid.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
-#include <linux/io.h>
 
-/* ISA device, if found */
-static struct platform_device *pdev;
+#ifdef CONFIG_ISA
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#endif
 
 /* Addresses to scan */
 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
                                                 0x2e, 0x2f, I2C_CLIENT_END };
-static unsigned short isa_address = 0x290;
-
 enum chips { lm78, lm79 };
 
 /* Many LM78 constants specified below */
@@ -476,6 +474,16 @@ static const struct attribute_group lm78_group = {
         .attrs = lm78_attributes,
 };
 
+/*
+ * ISA related code
+ */
+#ifdef CONFIG_ISA
+
+/* ISA device, if found */
+static struct platform_device *pdev;
+
+static unsigned short isa_address = 0x290;
+
 /* I2C devices get this name attribute automatically, but for ISA devices
    we must create it by ourselves. */
 static ssize_t show_name(struct device *dev, struct device_attribute
@@ -487,6 +495,11 @@ static ssize_t show_name(struct device *dev, struct device_attribute
 }
 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
 
+static struct lm78_data *lm78_data_if_isa(void)
+{
+        return pdev ? platform_get_drvdata(pdev) : NULL;
+}
+
 /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
 static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
 {
@@ -520,12 +533,24 @@ static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
 
         return 1;
 }
+#else /* !CONFIG_ISA */
+
+static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
+{
+        return 0;
+}
+
+static struct lm78_data *lm78_data_if_isa(void)
+{
+        return NULL;
+}
+#endif /* CONFIG_ISA */
 
 static int lm78_i2c_detect(struct i2c_client *client,
                            struct i2c_board_info *info)
 {
         int i;
-        struct lm78_data *isa = pdev ? platform_get_drvdata(pdev) : NULL;
+        struct lm78_data *isa = lm78_data_if_isa();
         const char *client_name;
         struct i2c_adapter *adapter = client->adapter;
         int address = client->addr;
@@ -653,6 +678,7 @@ static int lm78_read_value(struct lm78_data *data, u8 reg)
 {
         struct i2c_client *client = data->client;
 
+#ifdef CONFIG_ISA
         if (!client) { /* ISA device */
                 int res;
                 mutex_lock(&data->lock);
@@ -661,6 +687,7 @@ static int lm78_read_value(struct lm78_data *data, u8 reg)
                 mutex_unlock(&data->lock);
                 return res;
         } else
+#endif
                 return i2c_smbus_read_byte_data(client, reg);
 }
 
@@ -675,6 +702,7 @@ static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
 {
         struct i2c_client *client = data->client;
 
+#ifdef CONFIG_ISA
         if (!client) { /* ISA device */
                 mutex_lock(&data->lock);
                 outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
@@ -682,6 +710,7 @@ static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value)
                 mutex_unlock(&data->lock);
                 return 0;
         } else
+#endif
                 return i2c_smbus_write_byte_data(client, reg, value);
 }
 
@@ -759,6 +788,7 @@ static struct lm78_data *lm78_update_device(struct device *dev)
         return data;
 }
 
+#ifdef CONFIG_ISA
 static int __devinit lm78_isa_probe(struct platform_device *pdev)
 {
         int err;
@@ -960,12 +990,10 @@ static int __init lm78_isa_device_add(unsigned short address)
         return err;
 }
 
-static int __init sm_lm78_init(void)
+static int __init lm78_isa_register(void)
 {
         int res;
 
-        /* We register the ISA device first, so that we can skip the
-         * registration of an I2C interface to the same device. */
         if (lm78_isa_found(isa_address)) {
                 res = platform_driver_register(&lm78_isa_driver);
                 if (res)
@@ -977,26 +1005,58 @@ static int __init sm_lm78_init(void)
                         goto exit_unreg_isa_driver;
         }
 
-        res = i2c_add_driver(&lm78_driver);
-        if (res)
-                goto exit_unreg_isa_device;
-
         return 0;
 
- exit_unreg_isa_device:
-        platform_device_unregister(pdev);
  exit_unreg_isa_driver:
         platform_driver_unregister(&lm78_isa_driver);
  exit:
         return res;
 }
 
-static void __exit sm_lm78_exit(void)
+static void lm78_isa_unregister(void)
 {
         if (pdev) {
                 platform_device_unregister(pdev);
                 platform_driver_unregister(&lm78_isa_driver);
         }
+}
+#else /* !CONFIG_ISA */
+
+static int __init lm78_isa_register(void)
+{
+        return 0;
+}
+
+static void lm78_isa_unregister(void)
+{
+}
+#endif /* CONFIG_ISA */
+
+static int __init sm_lm78_init(void)
+{
+        int res;
+
+        /* We register the ISA device first, so that we can skip the
+         * registration of an I2C interface to the same device. */
+        res = lm78_isa_register();
+        if (res)
+                goto exit;
+
+        res = i2c_add_driver(&lm78_driver);
+        if (res)
+                goto exit_unreg_isa_device;
+
+        return 0;
+
+ exit_unreg_isa_device:
+        lm78_isa_unregister();
+ exit:
+        return res;
+}
+
+static void __exit sm_lm78_exit(void)
+{
+        lm78_isa_unregister();
         i2c_del_driver(&lm78_driver);
 }