hwmon/sis5595: Convert to a platform driver

Convert the sis5595 driver from the nonsensical i2c-isa hack to a
regular platform driver.

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

2 files changed, 177 insertions, 149 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index b432584c49a..398a52e163e 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -431,8 +431,7 @@ config SENSORS_PC87427
 
 config SENSORS_SIS5595
 	tristate "Silicon Integrated Systems Corp. SiS5595"
-	depends on I2C && PCI && EXPERIMENTAL
-	select I2C_ISA
+	depends on PCI
 	help
 	  If you say yes here you get support for the integrated sensors in
 	  SiS5595 South Bridges.
diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
index 3f400263fc0..c56bae3bd4c 100644
--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -54,8 +54,7 @@
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <linux/pci.h>
-#include <linux/i2c.h>
-#include <linux/i2c-isa.h>
+#include <linux/platform_device.h>
 #include <linux/hwmon.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -72,10 +71,7 @@ module_param(force_addr, ushort, 0);
 MODULE_PARM_DESC(force_addr,
 		 "Initialize the base address of the sensors");
 
-/* Device address
-   Note that we can't determine the ISA address until we have initialized
-   our module */
-static unsigned short address;
+static struct platform_device *pdev;
 
 /* Many SIS5595 constants specified below */
 
@@ -165,7 +161,8 @@ static inline u8 DIV_TO_REG(int val)
 /* For each registered chip, we need to keep some data in memory.
    The structure is dynamically allocated. */
 struct sis5595_data {
-	struct i2c_client client;
+	unsigned short addr;
+	const char *name;
 	struct class_device *class_dev;
 	struct mutex lock;
 
@@ -189,21 +186,21 @@ struct sis5595_data {
 
 static struct pci_dev *s_bridge;	/* pointer to the (only) sis5595 */
 
-static int sis5595_detect(struct i2c_adapter *adapter);
-static int sis5595_detach_client(struct i2c_client *client);
+static int sis5595_probe(struct platform_device *pdev);
+static int sis5595_remove(struct platform_device *pdev);
 
-static int sis5595_read_value(struct i2c_client *client, u8 reg);
-static int sis5595_write_value(struct i2c_client *client, u8 reg, u8 value);
+static int sis5595_read_value(struct sis5595_data *data, u8 reg);
+static void sis5595_write_value(struct sis5595_data *data, u8 reg, u8 value);
 static struct sis5595_data *sis5595_update_device(struct device *dev);
-static void sis5595_init_client(struct i2c_client *client);
+static void sis5595_init_device(struct sis5595_data *data);
 
-static struct i2c_driver sis5595_driver = {
+static struct platform_driver sis5595_driver = {
 	.driver = {
 		.owner	= THIS_MODULE,
 		.name	= "sis5595",
 	},
-	.attach_adapter	= sis5595_detect,
-	.detach_client	= sis5595_detach_client,
+	.probe		= sis5595_probe,
+	.remove		= __devexit_p(sis5595_remove),
 };
 
 /* 4 Voltages */
@@ -228,13 +225,12 @@ static ssize_t show_in_max(struct device *dev, char *buf, int nr)
 static ssize_t set_in_min(struct device *dev, const char *buf,
 	       size_t count, int nr)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct sis5595_data *data = i2c_get_clientdata(client);
+	struct sis5595_data *data = dev_get_drvdata(dev);
 	unsigned long val = simple_strtoul(buf, NULL, 10);
 
 	mutex_lock(&data->update_lock);
 	data->in_min[nr] = IN_TO_REG(val);
-	sis5595_write_value(client, SIS5595_REG_IN_MIN(nr), data->in_min[nr]);
+	sis5595_write_value(data, SIS5595_REG_IN_MIN(nr), data->in_min[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -242,13 +238,12 @@ static ssize_t set_in_min(struct device *dev, const char *buf,
 static ssize_t set_in_max(struct device *dev, const char *buf,
 	       size_t count, int nr)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct sis5595_data *data = i2c_get_clientdata(client);
+	struct sis5595_data *data = dev_get_drvdata(dev);
 	unsigned long val = simple_strtoul(buf, NULL, 10);
 
 	mutex_lock(&data->update_lock);
 	data->in_max[nr] = IN_TO_REG(val);
-	sis5595_write_value(client, SIS5595_REG_IN_MAX(nr), data->in_max[nr]);
+	sis5595_write_value(data, SIS5595_REG_IN_MAX(nr), data->in_max[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -307,13 +302,12 @@ static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr,
 
 static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct sis5595_data *data = i2c_get_clientdata(client);
+	struct sis5595_data *data = dev_get_drvdata(dev);
 	long val = simple_strtol(buf, NULL, 10);
 
 	mutex_lock(&data->update_lock);
 	data->temp_over = TEMP_TO_REG(val);
-	sis5595_write_value(client, SIS5595_REG_TEMP_OVER, data->temp_over);
+	sis5595_write_value(data, SIS5595_REG_TEMP_OVER, data->temp_over);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -326,13 +320,12 @@ static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr,
 
 static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct sis5595_data *data = i2c_get_clientdata(client);
+	struct sis5595_data *data = dev_get_drvdata(dev);
 	long val = simple_strtol(buf, NULL, 10);
 
 	mutex_lock(&data->update_lock);
 	data->temp_hyst = TEMP_TO_REG(val);
-	sis5595_write_value(client, SIS5595_REG_TEMP_HYST, data->temp_hyst);
+	sis5595_write_value(data, SIS5595_REG_TEMP_HYST, data->temp_hyst);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -361,13 +354,12 @@ static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
 static ssize_t set_fan_min(struct device *dev, const char *buf,
 		size_t count, int nr)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct sis5595_data *data = i2c_get_clientdata(client);
+	struct sis5595_data *data = dev_get_drvdata(dev);
 	unsigned long val = simple_strtoul(buf, NULL, 10);
 
 	mutex_lock(&data->update_lock);
 	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
-	sis5595_write_value(client, SIS5595_REG_FAN_MIN(nr), data->fan_min[nr]);
+	sis5595_write_value(data, SIS5595_REG_FAN_MIN(nr), data->fan_min[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -385,8 +377,7 @@ static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
 static ssize_t set_fan_div(struct device *dev, const char *buf,
 	size_t count, int nr)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct sis5595_data *data = i2c_get_clientdata(client);
+	struct sis5595_data *data = dev_get_drvdata(dev);
 	unsigned long min;
 	unsigned long val = simple_strtoul(buf, NULL, 10);
 	int reg;
@@ -394,7 +385,7 @@ static ssize_t set_fan_div(struct device *dev, const char *buf,
 	mutex_lock(&data->update_lock);
 	min = FAN_FROM_REG(data->fan_min[nr],
 			DIV_FROM_REG(data->fan_div[nr]));
-	reg = sis5595_read_value(client, SIS5595_REG_FANDIV);
+	reg = sis5595_read_value(data, SIS5595_REG_FANDIV);
 
 	switch (val) {
 	case 1: data->fan_div[nr] = 0; break;
@@ -402,7 +393,7 @@ static ssize_t set_fan_div(struct device *dev, const char *buf,
 	case 4: data->fan_div[nr] = 2; break;
 	case 8: data->fan_div[nr] = 3; break;
 	default:
-		dev_err(&client->dev, "fan_div value %ld not "
+		dev_err(dev, "fan_div value %ld not "
 			"supported. Choose one of 1, 2, 4 or 8!\n", val);
 		mutex_unlock(&data->update_lock);
 		return -EINVAL;
@@ -416,10 +407,10 @@ static ssize_t set_fan_div(struct device *dev, const char *buf,
 		reg = (reg & 0x3f) | (data->fan_div[nr] << 6);
 		break;
 	}
-	sis5595_write_value(client, SIS5595_REG_FANDIV, reg);
+	sis5595_write_value(data, SIS5595_REG_FANDIV, reg);
 	data->fan_min[nr] =
 		FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
-	sis5595_write_value(client, SIS5595_REG_FAN_MIN(nr), data->fan_min[nr]);
+	sis5595_write_value(data, SIS5595_REG_FAN_MIN(nr), data->fan_min[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -473,6 +464,14 @@ static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, ch
 }
 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 
+static ssize_t show_name(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct sis5595_data *data = dev_get_drvdata(dev);
+	return sprintf(buf, "%s\n", data->name);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
 static struct attribute *sis5595_attributes[] = {
 	&dev_attr_in0_input.attr,
 	&dev_attr_in0_min.attr,
@@ -495,6 +494,7 @@ static struct attribute *sis5595_attributes[] = {
 	&dev_attr_fan2_div.attr,
 
 	&dev_attr_alarms.attr,
+	&dev_attr_name.attr,
 	NULL
 };
 
@@ -518,65 +518,32 @@ static const struct attribute_group sis5595_group_opt = {
 };
  
 /* This is called when the module is loaded */
-static int sis5595_detect(struct i2c_adapter *adapter)
+static int __devinit sis5595_probe(struct platform_device *pdev)
 {
 	int err = 0;
 	int i;
-	struct i2c_client *new_client;
 	struct sis5595_data *data;
+	struct resource *res;
 	char val;
-	u16 a;
 
-	if (force_addr)
-		address = force_addr & ~(SIS5595_EXTENT - 1);
 	/* Reserve the ISA region */
-	if (!request_region(address, SIS5595_EXTENT,
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!request_region(res->start, SIS5595_EXTENT,
 			    sis5595_driver.driver.name)) {
 		err = -EBUSY;
 		goto exit;
 	}
-	if (force_addr) {
-		dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n", address);
-		if (PCIBIOS_SUCCESSFUL !=
-		    pci_write_config_word(s_bridge, SIS5595_BASE_REG, address))
-			goto exit_release;
-		if (PCIBIOS_SUCCESSFUL !=
-		    pci_read_config_word(s_bridge, SIS5595_BASE_REG, &a))
-			goto exit_release;
-		if ((a & ~(SIS5595_EXTENT - 1)) != address)
-			/* doesn't work for some chips? */
-			goto exit_release;
-	}
-
-	if (PCIBIOS_SUCCESSFUL !=
-	    pci_read_config_byte(s_bridge, SIS5595_ENABLE_REG, &val)) {
-		goto exit_release;
-	}
-	if ((val & 0x80) == 0) {
-		if (PCIBIOS_SUCCESSFUL !=
-		    pci_write_config_byte(s_bridge, SIS5595_ENABLE_REG,
-					  val | 0x80))
-			goto exit_release;
-		if (PCIBIOS_SUCCESSFUL !=
-		    pci_read_config_byte(s_bridge, SIS5595_ENABLE_REG, &val))
-			goto exit_release;
-		if ((val & 0x80) == 0) 
-			/* doesn't work for some chips! */
-			goto exit_release;
-	}
 
 	if (!(data = kzalloc(sizeof(struct sis5595_data), GFP_KERNEL))) {
 		err = -ENOMEM;
 		goto exit_release;
 	}
 
-	new_client = &data->client;
-	new_client->addr = address;
 	mutex_init(&data->lock);
-	i2c_set_clientdata(new_client, data);
-	new_client->adapter = adapter;
-	new_client->driver = &sis5595_driver;
-	new_client->flags = 0;
+	mutex_init(&data->update_lock);
+	data->addr = res->start;
+	data->name = "sis5595";
+	platform_set_drvdata(pdev, data);
 
 	/* Check revision and pin registers to determine whether 4 or 5 voltages */
 	pci_read_config_byte(s_bridge, SIS5595_REVISION_REG, &(data->revision));
@@ -589,47 +556,37 @@ static int sis5595_detect(struct i2c_adapter *adapter)
 			data->maxins = 4;
 	}
 	
-	/* Fill in the remaining client fields and put it into the global list */
-	strlcpy(new_client->name, "sis5595", I2C_NAME_SIZE);
-
-	data->valid = 0;
-	mutex_init(&data->update_lock);
-
-	/* Tell the I2C layer a new client has arrived */
-	if ((err = i2c_attach_client(new_client)))
-		goto exit_free;
-	
 	/* Initialize the SIS5595 chip */
-	sis5595_init_client(new_client);
+	sis5595_init_device(data);
 
 	/* A few vars need to be filled upon startup */
 	for (i = 0; i < 2; i++) {
-		data->fan_min[i] = sis5595_read_value(new_client,
+		data->fan_min[i] = sis5595_read_value(data,
 					SIS5595_REG_FAN_MIN(i));
 	}
 
 	/* Register sysfs hooks */
-	if ((err = sysfs_create_group(&new_client->dev.kobj, &sis5595_group)))
-		goto exit_detach;
+	if ((err = sysfs_create_group(&pdev->dev.kobj, &sis5595_group)))
+		goto exit_free;
 	if (data->maxins == 4) {
-		if ((err = device_create_file(&new_client->dev,
+		if ((err = device_create_file(&pdev->dev,
 					      &dev_attr_in4_input))
-		 || (err = device_create_file(&new_client->dev,
+		 || (err = device_create_file(&pdev->dev,
 					      &dev_attr_in4_min))
-		 || (err = device_create_file(&new_client->dev,
+		 || (err = device_create_file(&pdev->dev,
 					      &dev_attr_in4_max)))
 			goto exit_remove_files;
 	} else {
-		if ((err = device_create_file(&new_client->dev,
+		if ((err = device_create_file(&pdev->dev,
 					      &dev_attr_temp1_input))
-		 || (err = device_create_file(&new_client->dev,
+		 || (err = device_create_file(&pdev->dev,
 					      &dev_attr_temp1_max))
-		 || (err = device_create_file(&new_client->dev,
+		 || (err = device_create_file(&pdev->dev,
 					      &dev_attr_temp1_max_hyst)))
 			goto exit_remove_files;
 	}
 
-	data->class_dev = hwmon_device_register(&new_client->dev);
+	data->class_dev = hwmon_device_register(&pdev->dev);
 	if (IS_ERR(data->class_dev)) {
 		err = PTR_ERR(data->class_dev);
 		goto exit_remove_files;
@@ -638,32 +595,26 @@ static int sis5595_detect(struct i2c_adapter *adapter)
 	return 0;
 
 exit_remove_files:
-	sysfs_remove_group(&new_client->dev.kobj, &sis5595_group);
-	sysfs_remove_group(&new_client->dev.kobj, &sis5595_group_opt);
-exit_detach:
-	i2c_detach_client(new_client);
+	sysfs_remove_group(&pdev->dev.kobj, &sis5595_group);
+	sysfs_remove_group(&pdev->dev.kobj, &sis5595_group_opt);
 exit_free:
 	kfree(data);
 exit_release:
-	release_region(address, SIS5595_EXTENT);
+	release_region(res->start, SIS5595_EXTENT);
 exit:
 	return err;
 }
 
-static int sis5595_detach_client(struct i2c_client *client)
+static int __devexit sis5595_remove(struct platform_device *pdev)
 {
-	struct sis5595_data *data = i2c_get_clientdata(client);
-	int err;
+	struct sis5595_data *data = platform_get_drvdata(pdev);
 
 	hwmon_device_unregister(data->class_dev);
-	sysfs_remove_group(&client->dev.kobj, &sis5595_group);
-	sysfs_remove_group(&client->dev.kobj, &sis5595_group_opt);
-
-	if ((err = i2c_detach_client(client)))
-		return err;
-
-	release_region(client->addr, SIS5595_EXTENT);
+	sysfs_remove_group(&pdev->dev.kobj, &sis5595_group);
+	sysfs_remove_group(&pdev->dev.kobj, &sis5595_group_opt);
 
+	release_region(data->addr, SIS5595_EXTENT);
+	platform_set_drvdata(pdev, NULL);
 	kfree(data);
 
 	return 0;
@@ -671,41 +622,37 @@ static int sis5595_detach_client(struct i2c_client *client)
 
 
 /* ISA access must be locked explicitly. */
-static int sis5595_read_value(struct i2c_client *client, u8 reg)
+static int sis5595_read_value(struct sis5595_data *data, u8 reg)
 {
 	int res;
 
-	struct sis5595_data *data = i2c_get_clientdata(client);
 	mutex_lock(&data->lock);
-	outb_p(reg, client->addr + SIS5595_ADDR_REG_OFFSET);
-	res = inb_p(client->addr + SIS5595_DATA_REG_OFFSET);
+	outb_p(reg, data->addr + SIS5595_ADDR_REG_OFFSET);
+	res = inb_p(data->addr + SIS5595_DATA_REG_OFFSET);
 	mutex_unlock(&data->lock);
 	return res;
 }
 
-static int sis5595_write_value(struct i2c_client *client, u8 reg, u8 value)
+static void sis5595_write_value(struct sis5595_data *data, u8 reg, u8 value)
 {
-	struct sis5595_data *data = i2c_get_clientdata(client);
 	mutex_lock(&data->lock);
-	outb_p(reg, client->addr + SIS5595_ADDR_REG_OFFSET);
-	outb_p(value, client->addr + SIS5595_DATA_REG_OFFSET);
+	outb_p(reg, data->addr + SIS5595_ADDR_REG_OFFSET);
+	outb_p(value, data->addr + SIS5595_DATA_REG_OFFSET);
 	mutex_unlock(&data->lock);
-	return 0;
 }
 
 /* Called when we have found a new SIS5595. */
-static void sis5595_init_client(struct i2c_client *client)
+static void __devinit sis5595_init_device(struct sis5595_data *data)
 {
-	u8 config = sis5595_read_value(client, SIS5595_REG_CONFIG);
+	u8 config = sis5595_read_value(data, SIS5595_REG_CONFIG);
 	if (!(config & 0x01))
-		sis5595_write_value(client, SIS5595_REG_CONFIG,
+		sis5595_write_value(data, SIS5595_REG_CONFIG,
 				(config & 0xf7) | 0x01);
 }
 
 static struct sis5595_data *sis5595_update_device(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct sis5595_data *data = i2c_get_clientdata(client);
+	struct sis5595_data *data = dev_get_drvdata(dev);
 	int i;
 
 	mutex_lock(&data->update_lock);
@@ -715,35 +662,35 @@ static struct sis5595_data *sis5595_update_device(struct device *dev)
 
 		for (i = 0; i <= data->maxins; i++) {
 			data->in[i] =
-			    sis5595_read_value(client, SIS5595_REG_IN(i));
+			    sis5595_read_value(data, SIS5595_REG_IN(i));
 			data->in_min[i] =
-			    sis5595_read_value(client,
+			    sis5595_read_value(data,
 					       SIS5595_REG_IN_MIN(i));
 			data->in_max[i] =
-			    sis5595_read_value(client,
+			    sis5595_read_value(data,
 					       SIS5595_REG_IN_MAX(i));
 		}
 		for (i = 0; i < 2; i++) {
 			data->fan[i] =
-			    sis5595_read_value(client, SIS5595_REG_FAN(i));
+			    sis5595_read_value(data, SIS5595_REG_FAN(i));
 			data->fan_min[i] =
-			    sis5595_read_value(client,
+			    sis5595_read_value(data,
 					       SIS5595_REG_FAN_MIN(i));
 		}
 		if (data->maxins == 3) {
 			data->temp =
-			    sis5595_read_value(client, SIS5595_REG_TEMP);
+			    sis5595_read_value(data, SIS5595_REG_TEMP);
 			data->temp_over =
-			    sis5595_read_value(client, SIS5595_REG_TEMP_OVER);
+			    sis5595_read_value(data, SIS5595_REG_TEMP_OVER);
 			data->temp_hyst =
-			    sis5595_read_value(client, SIS5595_REG_TEMP_HYST);
+			    sis5595_read_value(data, SIS5595_REG_TEMP_HYST);
 		}
-		i = sis5595_read_value(client, SIS5595_REG_FANDIV);
+		i = sis5595_read_value(data, SIS5595_REG_FANDIV);
 		data->fan_div[0] = (i >> 4) & 0x03;
 		data->fan_div[1] = i >> 6;
 		data->alarms =
-		    sis5595_read_value(client, SIS5595_REG_ALARM1) |
-		    (sis5595_read_value(client, SIS5595_REG_ALARM2) << 8);
+		    sis5595_read_value(data, SIS5595_REG_ALARM1) |
+		    (sis5595_read_value(data, SIS5595_REG_ALARM2) << 8);
 		data->last_updated = jiffies;
 		data->valid = 1;
 	}
@@ -774,10 +721,50 @@ static int blacklist[] __devinitdata = {
 	PCI_DEVICE_ID_SI_5598,
 	0 };
 
+static int __devinit sis5595_device_add(unsigned short address)
+{
+	struct resource res = {
+		.start	= address,
+		.end	= address + SIS5595_EXTENT - 1,
+		.name	= "sis5595",
+		.flags	= IORESOURCE_IO,
+	};
+	int err;
+
+	pdev = platform_device_alloc("sis5595", address);
+	if (!pdev) {
+		err = -ENOMEM;
+		printk(KERN_ERR "sis5595: Device allocation failed\n");
+		goto exit;
+	}
+
+	err = platform_device_add_resources(pdev, &res, 1);
+	if (err) {
+		printk(KERN_ERR "sis5595: Device resource addition failed "
+		       "(%d)\n", err);
+		goto exit_device_put;
+	}
+
+	err = platform_device_add(pdev);
+	if (err) {
+		printk(KERN_ERR "sis5595: Device addition failed (%d)\n",
+		       err);
+		goto exit_device_put;
+	}
+
+	return 0;
+
+exit_device_put:
+	platform_device_put(pdev);
+exit:
+	return err;
+}
+
 static int __devinit sis5595_pci_probe(struct pci_dev *dev,
 				       const struct pci_device_id *id)
 {
-	u16 val;
+	u16 address;
+	u8 enable;
 	int *i;
 
 	for (i = blacklist; *i != 0; i++) {
@@ -790,27 +777,68 @@ static int __devinit sis5595_pci_probe(struct pci_dev *dev,
 		}
 	}
 	
+	force_addr &= ~(SIS5595_EXTENT - 1);
+	if (force_addr) {
+		dev_warn(&dev->dev, "Forcing ISA address 0x%x\n", force_addr);
+		pci_write_config_word(dev, SIS5595_BASE_REG, force_addr);
+	}
+
 	if (PCIBIOS_SUCCESSFUL !=
-	    pci_read_config_word(dev, SIS5595_BASE_REG, &val))
+	    pci_read_config_word(dev, SIS5595_BASE_REG, &address)) {
+		dev_err(&dev->dev, "Failed to read ISA address\n");
 		return -ENODEV;
+	}
 	
-	address = val & ~(SIS5595_EXTENT - 1);
-	if (address == 0 && force_addr == 0) {
+	address &= ~(SIS5595_EXTENT - 1);
+	if (!address) {
 		dev_err(&dev->dev, "Base address not set - upgrade BIOS or use force_addr=0xaddr\n");
 		return -ENODEV;
 	}
+	if (force_addr && address != force_addr) {
+		/* doesn't work for some chips? */
+		dev_err(&dev->dev, "Failed to force ISA address\n");
+		return -ENODEV;
+	}
 
-	s_bridge = pci_dev_get(dev);
-	if (i2c_isa_add_driver(&sis5595_driver)) {
-		pci_dev_put(s_bridge);
-		s_bridge = NULL;
+	if (PCIBIOS_SUCCESSFUL !=
+	    pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable)) {
+		dev_err(&dev->dev, "Failed to read enable register\n");
+		return -ENODEV;
+	}
+	if (!(enable & 0x80)) {
+		if ((PCIBIOS_SUCCESSFUL !=
+		     pci_write_config_byte(dev, SIS5595_ENABLE_REG,
+					   enable | 0x80))
+		 || (PCIBIOS_SUCCESSFUL !=
+		     pci_read_config_byte(dev, SIS5595_ENABLE_REG, &enable))
+		 || (!(enable & 0x80))) {
+			/* doesn't work for some chips! */
+			dev_err(&dev->dev, "Failed to enable HWM device\n");
+			return -ENODEV;
+		}
 	}
 
+	if (platform_driver_register(&sis5595_driver)) {
+		dev_dbg(&dev->dev, "Failed to register sis5595 driver\n");
+		goto exit;
+	}
+
+	s_bridge = pci_dev_get(dev);
+	/* Sets global pdev as a side effect */
+	if (sis5595_device_add(address))
+		goto exit_unregister;
+
 	/* Always return failure here.  This is to allow other drivers to bind
 	 * to this pci device.  We don't really want to have control over the
 	 * pci device, we only wanted to read as few register values from it.
 	 */
 	return -ENODEV;
+
+exit_unregister:
+	pci_dev_put(dev);
+	platform_driver_unregister(&sis5595_driver);
+exit:
+	return -ENODEV;
 }
 
 static struct pci_driver sis5595_pci_driver = {
@@ -828,7 +856,8 @@ static void __exit sm_sis5595_exit(void)
 {
 	pci_unregister_driver(&sis5595_pci_driver);
 	if (s_bridge != NULL) {
-		i2c_isa_del_driver(&sis5595_driver);
+		platform_device_unregister(pdev);
+		platform_driver_unregister(&sis5595_driver);
 		pci_dev_put(s_bridge);
 		s_bridge = NULL;
 	}