hwmon/w83781d: No longer use i2c-isa

Reimplement the ISA device support as a platform driver, so that we no
longer rely on i2c-isa.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 377 insertions, 194 deletions

diff --git a/drivers/hwmon/w83781d.c b/drivers/hwmon/w83781d.c
index a47da3ec5472..96338ddd74a7 100644
--- a/drivers/hwmon/w83781d.c
+++ b/drivers/hwmon/w83781d.c
@@ -2,8 +2,9 @@
     w83781d.c - Part of lm_sensors, Linux kernel modules for hardware
                 monitoring
     Copyright (c) 1998 - 2001  Frodo Looijaard <frodol@dds.nl>,
-    Philip Edelbrock <phil@netroedge.com>,
-    and Mark Studebaker <mdsxyz123@yahoo.com>
+                               Philip Edelbrock <phil@netroedge.com>,
+                               and Mark Studebaker <mdsxyz123@yahoo.com>
+    Copyright (c) 2007         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
@@ -38,7 +39,8 @@
 #include <linux/slab.h>
 #include <linux/jiffies.h>
 #include <linux/i2c.h>
-#include <linux/i2c-isa.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-vid.h>
 #include <linux/sysfs.h>
@@ -47,6 +49,9 @@
 #include <asm/io.h>
 #include "lm75.h"
 
+/* ISA device, if found */
+static struct platform_device *pdev;
+
 /* Addresses to scan */
 static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
                                         0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
@@ -221,8 +226,8 @@ DIV_TO_REG(long val, enum chips type)
    a bit - except if there could be more than one SMBus. Groan. No solution
    for this yet. */
 
-/* For each registered chip, we need to keep some data in memory.
-   The structure is dynamically allocated. */
+/* For ISA chips, we abuse the i2c_client addr and name fields. We also use
+   the driver field to differentiate between I2C and ISA chips. */
 struct w83781d_data {
         struct i2c_client client;
         struct class_device *class_dev;
@@ -263,14 +268,16 @@ struct w83781d_data {
 };
 
 static int w83781d_attach_adapter(struct i2c_adapter *adapter);
-static int w83781d_isa_attach_adapter(struct i2c_adapter *adapter);
 static int w83781d_detect(struct i2c_adapter *adapter, int address, int kind);
 static int w83781d_detach_client(struct i2c_client *client);
 
+static int __devinit w83781d_isa_probe(struct platform_device *pdev);
+static int __devexit w83781d_isa_remove(struct platform_device *pdev);
+
 static int w83781d_read_value(struct i2c_client *client, u16 reg);
 static int w83781d_write_value(struct i2c_client *client, u16 reg, u16 value);
 static struct w83781d_data *w83781d_update_device(struct device *dev);
-static void w83781d_init_client(struct i2c_client *client);
+static void w83781d_init_device(struct device *dev);
 
 static struct i2c_driver w83781d_driver = {
         .driver = {
@@ -281,13 +288,13 @@ static struct i2c_driver w83781d_driver = {
         .detach_client = w83781d_detach_client,
 };
 
-static struct i2c_driver w83781d_isa_driver = {
+static struct platform_driver w83781d_isa_driver = {
         .driver = {
                 .owner = THIS_MODULE,
-                .name = "w83781d-isa",
+                .name = "w83781d",
         },
-        .attach_adapter = w83781d_isa_attach_adapter,
-        .detach_client = w83781d_detach_client,
+        .probe = w83781d_isa_probe,
+        .remove = w83781d_isa_remove,
 };
 
 
@@ -305,8 +312,8 @@ show_in_reg(in_max);
 #define store_in_reg(REG, reg) \
 static ssize_t store_in_##reg (struct device *dev, const char *buf, size_t count, int nr) \
 { \
-        struct i2c_client *client = to_i2c_client(dev); \
-        struct w83781d_data *data = i2c_get_clientdata(client); \
+        struct w83781d_data *data = dev_get_drvdata(dev); \
+        struct i2c_client *client = &data->client; \
         u32 val; \
          \
         val = simple_strtoul(buf, NULL, 10) / 10; \
@@ -368,8 +375,8 @@ show_fan_reg(fan_min);
 static ssize_t
 store_fan_min(struct device *dev, const char *buf, size_t count, int nr)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         u32 val;
 
         val = simple_strtoul(buf, NULL, 10);
@@ -427,8 +434,8 @@ show_temp_reg(temp_max_hyst);
 #define store_temp_reg(REG, reg) \
 static ssize_t store_temp_##reg (struct device *dev, const char *buf, size_t count, int nr) \
 { \
-        struct i2c_client *client = to_i2c_client(dev); \
-        struct w83781d_data *data = i2c_get_clientdata(client); \
+        struct w83781d_data *data = dev_get_drvdata(dev); \
+        struct i2c_client *client = &data->client; \
         s32 val; \
          \
         val = simple_strtol(buf, NULL, 10); \
@@ -498,8 +505,7 @@ show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
 static ssize_t
 store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
         u32 val;
 
         val = simple_strtoul(buf, NULL, 10);
@@ -539,8 +545,8 @@ static ssize_t
 store_beep_reg(struct device *dev, const char *buf, size_t count,
                int update_mask)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         u32 val, val2;
 
         val = simple_strtoul(buf, NULL, 10);
@@ -599,8 +605,8 @@ show_fan_div_reg(struct device *dev, char *buf, int nr)
 static ssize_t
 store_fan_div_reg(struct device *dev, const char *buf, size_t count, int nr)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         unsigned long min;
         u8 reg;
         unsigned long val = simple_strtoul(buf, NULL, 10);
@@ -666,8 +672,8 @@ show_pwmenable_reg(struct device *dev, char *buf, int nr)
 static ssize_t
 store_pwm_reg(struct device *dev, const char *buf, size_t count, int nr)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         u32 val;
 
         val = simple_strtoul(buf, NULL, 10);
@@ -682,8 +688,8 @@ store_pwm_reg(struct device *dev, const char *buf, size_t count, int nr)
 static ssize_t
 store_pwmenable_reg(struct device *dev, const char *buf, size_t count, int nr)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         u32 val, reg;
 
         val = simple_strtoul(buf, NULL, 10);
@@ -755,8 +761,8 @@ show_sensor_reg(struct device *dev, char *buf, int nr)
 static ssize_t
 store_sensor_reg(struct device *dev, const char *buf, size_t count, int nr)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         u32 val, tmp;
 
         val = simple_strtoul(buf, NULL, 10);
@@ -813,6 +819,16 @@ sysfs_sensor(1);
 sysfs_sensor(2);
 sysfs_sensor(3);
 
+/* 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 *devattr, char *buf)
+{
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        return sprintf(buf, "%s\n", data->client.name);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
 /* This function is called when:
      * w83781d_driver is inserted (when this module is loaded), for each
        available adapter
@@ -825,12 +841,6 @@ w83781d_attach_adapter(struct i2c_adapter *adapter)
         return i2c_probe(adapter, &addr_data, w83781d_detect);
 }
 
-static int
-w83781d_isa_attach_adapter(struct i2c_adapter *adapter)
-{
-        return w83781d_detect(adapter, isa_address, -1);
-}
-
 /* Assumes that adapter is of I2C, not ISA variety.
  * OTHERWISE DON'T CALL THIS
  */
@@ -994,77 +1004,85 @@ static const struct attribute_group w83781d_group_opt = {
         .attrs = w83781d_attributes_opt,
 };
 
+/* No clean up is done on error, it's up to the caller */
 static int
-w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
+w83781d_create_files(struct device *dev, int kind, int is_isa)
 {
-        int i = 0, val1 = 0, val2;
-        struct i2c_client *client;
-        struct device *dev;
-        struct w83781d_data *data;
         int err;
-        const char *client_name = "";
-        int is_isa = i2c_is_isa_adapter(adapter);
-        enum vendor { winbond, asus } vendid;
 
-        if (!is_isa
-            && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
-                err = -EINVAL;
-                goto ERROR0;
+        if ((err = sysfs_create_group(&dev->kobj, &w83781d_group)))
+                return err;
+
+        if (kind != w83783s) {
+                if ((err = device_create_file(dev, &dev_attr_in1_input))
+                    || (err = device_create_file(dev, &dev_attr_in1_min))
+                    || (err = device_create_file(dev, &dev_attr_in1_max)))
+                        return err;
+        }
+        if (kind != as99127f && kind != w83781d && kind != w83783s) {
+                if ((err = device_create_file(dev, &dev_attr_in7_input))
+                    || (err = device_create_file(dev, &dev_attr_in7_min))
+                    || (err = device_create_file(dev, &dev_attr_in7_max))
+                    || (err = device_create_file(dev, &dev_attr_in8_input))
+                    || (err = device_create_file(dev, &dev_attr_in8_min))
+                    || (err = device_create_file(dev, &dev_attr_in8_max)))
+                        return err;
+        }
+        if (kind != w83783s) {
+                if ((err = device_create_file(dev, &dev_attr_temp3_input))
+                    || (err = device_create_file(dev, &dev_attr_temp3_max))
+                    || (err = device_create_file(dev,
+                                                 &dev_attr_temp3_max_hyst)))
+                        return err;
         }
 
-        /* Prevent users from forcing a kind for a bus it isn't supposed
-           to possibly be on */
-        if (is_isa && (kind == as99127f || kind == w83783s)) {
-                dev_err(&adapter->dev,
-                        "Cannot force I2C-only chip for ISA address 0x%02x.\n",
-                        address);
-                err = -EINVAL;
-                goto ERROR0;
+        if (kind != w83781d && kind != as99127f) {
+                if ((err = device_create_file(dev, &dev_attr_pwm1))
+                    || (err = device_create_file(dev, &dev_attr_pwm2))
+                    || (err = device_create_file(dev, &dev_attr_pwm2_enable)))
+                        return err;
         }
-        
-        if (is_isa)
-                if (!request_region(address, W83781D_EXTENT,
-                                    w83781d_isa_driver.driver.name)) {
-                        dev_dbg(&adapter->dev, "Request of region "
-                                "0x%x-0x%x for w83781d failed\n", address,
-                                address + W83781D_EXTENT - 1);
-                        err = -EBUSY;
-                        goto ERROR0;
+        if (kind == w83782d && !is_isa) {
+                if ((err = device_create_file(dev, &dev_attr_pwm3))
+                    || (err = device_create_file(dev, &dev_attr_pwm4)))
+                        return err;
+        }
+
+        if (kind != as99127f && kind != w83781d) {
+                if ((err = device_create_file(dev, &dev_attr_temp1_type))
+                    || (err = device_create_file(dev,
+                                                 &dev_attr_temp2_type)))
+                        return err;
+                if (kind != w83783s) {
+                        if ((err = device_create_file(dev,
+                                                      &dev_attr_temp3_type)))
+                                return err;
                 }
+        }
 
-        /* Probe whether there is anything available on this address. Already
-           done for SMBus clients */
-        if (kind < 0) {
-                if (is_isa) {
+        if (is_isa) {
+                err = device_create_file(&pdev->dev, &dev_attr_name);
+                if (err)
+                        return err;
+        }
 
-#define REALLY_SLOW_IO
-                        /* We need the timeouts for at least some LM78-like
-                           chips. But only if we read 'undefined' registers. */
-                        i = inb_p(address + 1);
-                        if (inb_p(address + 2) != i
-                         || inb_p(address + 3) != i
-                         || inb_p(address + 7) != i) {
-                                dev_dbg(&adapter->dev, "Detection of w83781d "
-                                        "chip failed at step 1\n");
-                                err = -ENODEV;
-                                goto ERROR1;
-                        }
-#undef REALLY_SLOW_IO
+        return 0;
+}
 
-                        /* Let's just hope nothing breaks here */
-                        i = inb_p(address + 5) & 0x7f;
-                        outb_p(~i & 0x7f, address + 5);
-                        val2 = inb_p(address + 5) & 0x7f;
-                        if (val2 != (~i & 0x7f)) {
-                                outb_p(i, address + 5);
-                                dev_dbg(&adapter->dev, "Detection of w83781d "
-                                        "chip failed at step 2 (0x%x != "
-                                        "0x%x at 0x%x)\n", val2, ~i & 0x7f,
-                                        address + 5);
-                                err = -ENODEV;
-                                goto ERROR1;
-                        }
-                }
+static int
+w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+        int val1 = 0, val2;
+        struct i2c_client *client;
+        struct device *dev;
+        struct w83781d_data *data;
+        int err;
+        const char *client_name = "";
+        enum vendor { winbond, asus } vendid;
+
+        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+                err = -EINVAL;
+                goto ERROR1;
         }
 
         /* OK. For now, we presume we have a valid client. We now create the
@@ -1081,8 +1099,7 @@ w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
         client->addr = address;
         mutex_init(&data->lock);
         client->adapter = adapter;
-        client->driver = is_isa ? &w83781d_isa_driver : &w83781d_driver;
-        client->flags = 0;
+        client->driver = &w83781d_driver;
         dev = &client->dev;
 
         /* Now, we do the remaining detection. */
@@ -1111,8 +1128,8 @@ w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
                 }
                 /* If Winbond SMBus, check address at 0x48.
                    Asus doesn't support, except for as99127f rev.2 */
-                if ((!is_isa) && (((!(val1 & 0x80)) && (val2 == 0xa3)) ||
-                                  ((val1 & 0x80) && (val2 == 0x5c)))) {
+                if ((!(val1 & 0x80) && (val2 == 0xa3)) ||
+                    ((val1 & 0x80) && (val2 == 0x5c))) {
                         if (w83781d_read_value
                             (client, W83781D_REG_I2C_ADDR) != address) {
                                 dev_dbg(&adapter->dev, "Detection of w83781d "
@@ -1149,12 +1166,11 @@ w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
                         kind = w83781d;
                 else if (val1 == 0x30 && vendid == winbond)
                         kind = w83782d;
-                else if (val1 == 0x40 && vendid == winbond && !is_isa
-                                && address == 0x2d)
+                else if (val1 == 0x40 && vendid == winbond && address == 0x2d)
                         kind = w83783s;
                 else if (val1 == 0x21 && vendid == winbond)
                         kind = w83627hf;
-                else if (val1 == 0x31 && !is_isa && address >= 0x28)
+                else if (val1 == 0x31 && address >= 0x28)
                         kind = as99127f;
                 else {
                         if (kind == 0)
@@ -1182,86 +1198,23 @@ w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
         strlcpy(client->name, client_name, I2C_NAME_SIZE);
         data->type = kind;
 
-        data->valid = 0;
-        mutex_init(&data->update_lock);
-
         /* Tell the I2C layer a new client has arrived */
         if ((err = i2c_attach_client(client)))
                 goto ERROR2;
 
         /* attach secondary i2c lm75-like clients */
-        if (!is_isa) {
-                if ((err = w83781d_detect_subclients(adapter, address,
-                                kind, client)))
-                        goto ERROR3;
-        } else {
-                data->lm75[0] = NULL;
-                data->lm75[1] = NULL;
-        }
+        if ((err = w83781d_detect_subclients(adapter, address,
+                        kind, client)))
+                goto ERROR3;
 
         /* Initialize the chip */
-        w83781d_init_client(client);
-
-        /* A few vars need to be filled upon startup */
-        for (i = 1; i <= 3; i++) {
-                data->fan_min[i - 1] = w83781d_read_value(client,
-                                        W83781D_REG_FAN_MIN(i));
-        }
-        if (kind != w83781d && kind != as99127f)
-                for (i = 0; i < 4; i++)
-                        data->pwmenable[i] = 1;
+        w83781d_init_device(dev);
 
         /* Register sysfs hooks */
-        if ((err = sysfs_create_group(&dev->kobj, &w83781d_group)))
+        err = w83781d_create_files(dev, kind, 0);
+        if (err)
                 goto ERROR4;
 
-        if (kind != w83783s) {
-                if ((err = device_create_file(dev, &dev_attr_in1_input))
-                    || (err = device_create_file(dev, &dev_attr_in1_min))
-                    || (err = device_create_file(dev, &dev_attr_in1_max)))
-                        goto ERROR4;
-        }
-        if (kind != as99127f && kind != w83781d && kind != w83783s) {
-                if ((err = device_create_file(dev, &dev_attr_in7_input))
-                    || (err = device_create_file(dev, &dev_attr_in7_min))
-                    || (err = device_create_file(dev, &dev_attr_in7_max))
-                    || (err = device_create_file(dev, &dev_attr_in8_input))
-                    || (err = device_create_file(dev, &dev_attr_in8_min))
-                    || (err = device_create_file(dev, &dev_attr_in8_max)))
-                        goto ERROR4;
-        }
-        if (kind != w83783s) {
-                if ((err = device_create_file(dev, &dev_attr_temp3_input))
-                    || (err = device_create_file(dev, &dev_attr_temp3_max))
-                    || (err = device_create_file(dev,
-                                                 &dev_attr_temp3_max_hyst)))
-                        goto ERROR4;
-        }
-
-        if (kind != w83781d && kind != as99127f) {
-                if ((err = device_create_file(dev, &dev_attr_pwm1))
-                    || (err = device_create_file(dev, &dev_attr_pwm2))
-                    || (err = device_create_file(dev, &dev_attr_pwm2_enable)))
-                        goto ERROR4;
-        }
-        if (kind == w83782d && !is_isa) {
-                if ((err = device_create_file(dev, &dev_attr_pwm3))
-                    || (err = device_create_file(dev, &dev_attr_pwm4)))
-                        goto ERROR4;
-        }
-
-        if (kind != as99127f && kind != w83781d) {
-                if ((err = device_create_file(dev, &dev_attr_temp1_type))
-                    || (err = device_create_file(dev,
-                                                 &dev_attr_temp2_type)))
-                        goto ERROR4;
-                if (kind != w83783s) {
-                        if ((err = device_create_file(dev,
-                                                      &dev_attr_temp3_type)))
-                                goto ERROR4;
-                }
-        }
-
         data->class_dev = hwmon_device_register(dev);
         if (IS_ERR(data->class_dev)) {
                 err = PTR_ERR(data->class_dev);
@@ -1287,9 +1240,6 @@ ERROR3:
 ERROR2:
         kfree(data);
 ERROR1:
-        if (is_isa)
-                release_region(address, W83781D_EXTENT);
-ERROR0:
         return err;
 }
 
@@ -1305,8 +1255,6 @@ w83781d_detach_client(struct i2c_client *client)
                 sysfs_remove_group(&client->dev.kobj, &w83781d_group);
                 sysfs_remove_group(&client->dev.kobj, &w83781d_group_opt);
         }
-        if (i2c_is_isa_client(client))
-                release_region(client->addr, W83781D_EXTENT);
 
         if ((err = i2c_detach_client(client)))
                 return err;
@@ -1322,6 +1270,88 @@ w83781d_detach_client(struct i2c_client *client)
         return 0;
 }
 
+static int __devinit
+w83781d_isa_probe(struct platform_device *pdev)
+{
+        int err, reg;
+        struct w83781d_data *data;
+        struct resource *res;
+        const char *name;
+
+        /* Reserve the ISA region */
+        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+        if (!request_region(res->start, W83781D_EXTENT, "w83781d")) {
+                err = -EBUSY;
+                goto exit;
+        }
+
+        if (!(data = kzalloc(sizeof(struct w83781d_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto exit_release_region;
+        }
+        mutex_init(&data->lock);
+        data->client.addr = res->start;
+        i2c_set_clientdata(&data->client, data);
+        platform_set_drvdata(pdev, data);
+
+        reg = w83781d_read_value(&data->client, W83781D_REG_WCHIPID);
+        switch (reg) {
+        case 0x21:
+                data->type = w83627hf;
+                name = "w83627hf";
+                break;
+        case 0x30:
+                data->type = w83782d;
+                name = "w83782d";
+                break;
+        default:
+                data->type = w83781d;
+                name = "w83781d";
+        }
+        strlcpy(data->client.name, name, I2C_NAME_SIZE);
+
+        /* Initialize the W83781D chip */
+        w83781d_init_device(&pdev->dev);
+
+        /* Register sysfs hooks */
+        err = w83781d_create_files(&pdev->dev, data->type, 1);
+        if (err)
+                goto exit_remove_files;
+
+        data->class_dev = hwmon_device_register(&pdev->dev);
+        if (IS_ERR(data->class_dev)) {
+                err = PTR_ERR(data->class_dev);
+                goto exit_remove_files;
+        }
+
+        return 0;
+
+ exit_remove_files:
+        sysfs_remove_group(&pdev->dev.kobj, &w83781d_group);
+        sysfs_remove_group(&pdev->dev.kobj, &w83781d_group_opt);
+        device_remove_file(&pdev->dev, &dev_attr_name);
+        kfree(data);
+ exit_release_region:
+        release_region(res->start, W83781D_EXTENT);
+ exit:
+        return err;
+}
+
+static int __devexit
+w83781d_isa_remove(struct platform_device *pdev)
+{
+        struct w83781d_data *data = platform_get_drvdata(pdev);
+
+        hwmon_device_unregister(data->class_dev);
+        sysfs_remove_group(&pdev->dev.kobj, &w83781d_group);
+        sysfs_remove_group(&pdev->dev.kobj, &w83781d_group_opt);
+        device_remove_file(&pdev->dev, &dev_attr_name);
+        release_region(data->client.addr, W83781D_EXTENT);
+        kfree(data);
+
+        return 0;
+}
+
 /* The SMBus locks itself, usually, but nothing may access the Winbond between
    bank switches. ISA access must always be locked explicitly! 
    We ignore the W83781D BUSY flag at this moment - it could lead to deadlocks,
@@ -1336,7 +1366,7 @@ w83781d_read_value(struct i2c_client *client, u16 reg)
         struct i2c_client *cl;
 
         mutex_lock(&data->lock);
-        if (i2c_is_isa_client(client)) {
+        if (!client->driver) { /* ISA device */
                 word_sized = (((reg & 0xff00) == 0x100)
                               || ((reg & 0xff00) == 0x200))
                     && (((reg & 0x00ff) == 0x50)
@@ -1405,7 +1435,7 @@ w83781d_write_value(struct i2c_client *client, u16 reg, u16 value)
         struct i2c_client *cl;
 
         mutex_lock(&data->lock);
-        if (i2c_is_isa_client(client)) {
+        if (!client->driver) { /* ISA device */
                 word_sized = (((reg & 0xff00) == 0x100)
                               || ((reg & 0xff00) == 0x200))
                     && (((reg & 0x00ff) == 0x53)
@@ -1462,9 +1492,10 @@ w83781d_write_value(struct i2c_client *client, u16 reg, u16 value)
 }
 
 static void
-w83781d_init_client(struct i2c_client *client)
+w83781d_init_device(struct device *dev)
 {
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         int i, p;
         int type = data->type;
         u8 tmp;
@@ -1477,7 +1508,7 @@ w83781d_init_client(struct i2c_client *client)
                    It might even go away if nobody reports it as being useful,
                    as I see very little reason why this would be needed at
                    all. */
-                dev_info(&client->dev, "If reset=1 solved a problem you were "
+                dev_info(dev, "If reset=1 solved a problem you were "
                          "having, please report!\n");
 
                 /* save these registers */
@@ -1527,7 +1558,7 @@ w83781d_init_client(struct i2c_client *client)
                 /* Enable temp2 */
                 tmp = w83781d_read_value(client, W83781D_REG_TEMP2_CONFIG);
                 if (tmp & 0x01) {
-                        dev_warn(&client->dev, "Enabling temp2, readings "
+                        dev_warn(dev, "Enabling temp2, readings "
                                  "might not make sense\n");
                         w83781d_write_value(client, W83781D_REG_TEMP2_CONFIG,
                                 tmp & 0xfe);
@@ -1538,7 +1569,7 @@ w83781d_init_client(struct i2c_client *client)
                         tmp = w83781d_read_value(client,
                                 W83781D_REG_TEMP3_CONFIG);
                         if (tmp & 0x01) {
-                                dev_warn(&client->dev, "Enabling temp3, "
+                                dev_warn(dev, "Enabling temp3, "
                                          "readings might not make sense\n");
                                 w83781d_write_value(client,
                                         W83781D_REG_TEMP3_CONFIG, tmp & 0xfe);
@@ -1551,12 +1582,23 @@ w83781d_init_client(struct i2c_client *client)
                             (w83781d_read_value(client,
                                                 W83781D_REG_CONFIG) & 0xf7)
                             | 0x01);
+
+        /* A few vars need to be filled upon startup */
+        for (i = 1; i <= 3; i++) {
+                data->fan_min[i - 1] = w83781d_read_value(client,
+                                        W83781D_REG_FAN_MIN(i));
+        }
+        if (type != w83781d && type != as99127f)
+                for (i = 0; i < 4; i++)
+                        data->pwmenable[i] = 1;
+
+        mutex_init(&data->update_lock);
 }
 
 static struct w83781d_data *w83781d_update_device(struct device *dev)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct w83781d_data *data = i2c_get_clientdata(client);
+        struct w83781d_data *data = dev_get_drvdata(dev);
+        struct i2c_client *client = &data->client;
         int i;
 
         mutex_lock(&data->update_lock);
@@ -1589,8 +1631,7 @@ static struct w83781d_data *w83781d_update_device(struct device *dev)
                                 data->pwm[i - 1] =
                                     w83781d_read_value(client,
                                                        W83781D_REG_PWM(i));
-                                if ((data->type != w83782d
-                                     || i2c_is_isa_client(client))
+                                if ((data->type != w83782d || !client->driver)
                                     && i == 2)
                                         break;
                         }
@@ -1672,6 +1713,133 @@ static struct w83781d_data *w83781d_update_device(struct device *dev)
         return data;
 }
 
+/* return 1 if a supported chip is found, 0 otherwise */
+static int __init
+w83781d_isa_found(unsigned short address)
+{
+        int val, save, found = 0;
+
+        if (!request_region(address, W83781D_EXTENT, "w83781d"))
+                return 0;
+
+#define REALLY_SLOW_IO
+        /* We need the timeouts for at least some W83781D-like
+           chips. But only if we read 'undefined' registers. */
+        val = inb_p(address + 1);
+        if (inb_p(address + 2) != val
+         || inb_p(address + 3) != val
+         || inb_p(address + 7) != val) {
+                pr_debug("w83781d: Detection failed at step 1\n");
+                goto release;
+        }
+#undef REALLY_SLOW_IO
+
+        /* We should be able to change the 7 LSB of the address port. The
+           MSB (busy flag) should be clear initially, set after the write. */
+        save = inb_p(address + W83781D_ADDR_REG_OFFSET);
+        if (save & 0x80) {
+                pr_debug("w83781d: Detection failed at step 2\n");
+                goto release;
+        }
+        val = ~save & 0x7f;
+        outb_p(val, address + W83781D_ADDR_REG_OFFSET);
+        if (inb_p(address + W83781D_ADDR_REG_OFFSET) != (val | 0x80)) {
+                outb_p(save, address + W83781D_ADDR_REG_OFFSET);
+                pr_debug("w83781d: Detection failed at step 3\n");
+                goto release;
+        }
+
+        /* We found a device, now see if it could be a W83781D */
+        outb_p(W83781D_REG_CONFIG, address + W83781D_ADDR_REG_OFFSET);
+        val = inb_p(address + W83781D_DATA_REG_OFFSET);
+        if (val & 0x80) {
+                pr_debug("w83781d: Detection failed at step 4\n");
+                goto release;
+        }
+        outb_p(W83781D_REG_BANK, address + W83781D_ADDR_REG_OFFSET);
+        save = inb_p(address + W83781D_DATA_REG_OFFSET);
+        outb_p(W83781D_REG_CHIPMAN, address + W83781D_ADDR_REG_OFFSET);
+        val = inb_p(address + W83781D_DATA_REG_OFFSET);
+        if ((!(save & 0x80) && (val != 0xa3))
+         || ((save & 0x80) && (val != 0x5c))) {
+                pr_debug("w83781d: Detection failed at step 5\n");
+                goto release;
+        }
+        outb_p(W83781D_REG_I2C_ADDR, address + W83781D_ADDR_REG_OFFSET);
+        val = inb_p(address + W83781D_DATA_REG_OFFSET);
+        if (val < 0x03 || val > 0x77) { /* Not a valid I2C address */
+                pr_debug("w83781d: Detection failed at step 6\n");
+                goto release;
+        }
+
+        /* The busy flag should be clear again */
+        if (inb_p(address + W83781D_ADDR_REG_OFFSET) & 0x80) {
+                pr_debug("w83781d: Detection failed at step 7\n");
+                goto release;
+        }
+
+        /* Determine the chip type */
+        outb_p(W83781D_REG_BANK, address + W83781D_ADDR_REG_OFFSET);
+        save = inb_p(address + W83781D_DATA_REG_OFFSET);
+        outb_p(save & 0xf8, address + W83781D_DATA_REG_OFFSET);
+        outb_p(W83781D_REG_WCHIPID, address + W83781D_ADDR_REG_OFFSET);
+        val = inb_p(address + W83781D_DATA_REG_OFFSET);
+        if ((val & 0xfe) == 0x10        /* W83781D */
+         || val == 0x30                 /* W83782D */
+         || val == 0x21)                /* W83627HF */
+                found = 1;
+
+        if (found)
+                pr_info("w83781d: Found a %s chip at %#x\n",
+                        val == 0x21 ? "W83627HF" :
+                        val == 0x30 ? "W83782D" : "W83781D", (int)address);
+
+ release:
+        release_region(address, W83781D_EXTENT);
+        return found;
+}
+
+static int __init
+w83781d_isa_device_add(unsigned short address)
+{
+        struct resource res = {
+                .start  = address,
+                .end    = address + W83781D_EXTENT,
+                .name   = "w83781d",
+                .flags  = IORESOURCE_IO,
+        };
+        int err;
+
+        pdev = platform_device_alloc("w83781d", address);
+        if (!pdev) {
+                err = -ENOMEM;
+                printk(KERN_ERR "w83781d: Device allocation failed\n");
+                goto exit;
+        }
+
+        err = platform_device_add_resources(pdev, &res, 1);
+        if (err) {
+                printk(KERN_ERR "w83781d: Device resource addition failed "
+                       "(%d)\n", err);
+                goto exit_device_put;
+        }
+
+        err = platform_device_add(pdev);
+        if (err) {
+                printk(KERN_ERR "w83781d: Device addition failed (%d)\n",
+                       err);
+                goto exit_device_put;
+        }
+
+        return 0;
+
+ exit_device_put:
+        platform_device_put(pdev);
+ exit:
+        pdev = NULL;
+        return err;
+}
+
 static int __init
 sensors_w83781d_init(void)
 {
@@ -1679,21 +1847,36 @@ sensors_w83781d_init(void)
 
         res = i2c_add_driver(&w83781d_driver);
         if (res)
-                return res;
+                goto exit;
+
+        if (w83781d_isa_found(isa_address)) {
+                res = platform_driver_register(&w83781d_isa_driver);
+                if (res)
+                        goto exit_unreg_i2c_driver;
 
-        /* Don't exit if this one fails, we still want the I2C variants
-           to work! */
-        if (i2c_isa_add_driver(&w83781d_isa_driver))
-                isa_address = 0;
+                /* Sets global pdev as a side effect */
+                res = w83781d_isa_device_add(isa_address);
+                if (res)
+                        goto exit_unreg_isa_driver;
+        }
 
         return 0;
+
+ exit_unreg_isa_driver:
+        platform_driver_unregister(&w83781d_isa_driver);
+ exit_unreg_i2c_driver:
+        i2c_del_driver(&w83781d_driver);
+ exit:
+        return res;
 }
 
 static void __exit
 sensors_w83781d_exit(void)
 {
-        if (isa_address)
-                i2c_isa_del_driver(&w83781d_isa_driver);
+        if (pdev) {
+                platform_device_unregister(pdev);
+                platform_driver_unregister(&w83781d_isa_driver);
+        }
         i2c_del_driver(&w83781d_driver);
 }