hwmon/via686a: Convert to a platform driver

Convert the via686a driver from the nonsensical i2c-isa hack to a
regular platform driver.

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

1 files changed, 155 insertions, 130 deletions

diff --git a/drivers/hwmon/via686a.c b/drivers/hwmon/via686a.c
index a25b0542649c..0ee9a278537a 100644
--- a/drivers/hwmon/via686a.c
+++ b/drivers/hwmon/via686a.c
@@ -34,8 +34,7 @@
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/jiffies.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>
@@ -51,10 +50,7 @@ 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;
 
 /*
    The Via 686a southbridge has a LM78-like chip integrated on the same IC.
@@ -295,7 +291,8 @@ static inline long TEMP_FROM_REG10(u16 val)
 /* For each registered chip, we need to keep some data in memory.
    The structure is dynamically allocated. */
 struct via686a_data {
-        struct i2c_client client;
+        unsigned short addr;
+        const char *name;
         struct class_device *class_dev;
         struct mutex update_lock;
         char valid;             /* !=0 if following fields are valid */
@@ -315,22 +312,22 @@ struct via686a_data {
 
 static struct pci_dev *s_bridge;        /* pointer to the (only) via686a */
 
-static int via686a_detect(struct i2c_adapter *adapter);
-static int via686a_detach_client(struct i2c_client *client);
+static int via686a_probe(struct platform_device *pdev);
+static int via686a_remove(struct platform_device *pdev);
 
-static inline int via686a_read_value(struct i2c_client *client, u8 reg)
+static inline int via686a_read_value(struct via686a_data *data, u8 reg)
 {
-        return (inb_p(client->addr + reg));
+        return inb_p(data->addr + reg);
 }
 
-static inline void via686a_write_value(struct i2c_client *client, u8 reg,
+static inline void via686a_write_value(struct via686a_data *data, u8 reg,
                                        u8 value)
 {
-        outb_p(value, client->addr + reg);
+        outb_p(value, data->addr + reg);
 }
 
 static struct via686a_data *via686a_update_device(struct device *dev);
-static void via686a_init_client(struct i2c_client *client);
+static void via686a_init_device(struct via686a_data *data);
 
 /* following are the sysfs callback functions */
 
@@ -352,26 +349,24 @@ 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 via686a_data *data = i2c_get_clientdata(client);
+        struct via686a_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, nr);
-        via686a_write_value(client, VIA686A_REG_IN_MIN(nr),
+        via686a_write_value(data, VIA686A_REG_IN_MIN(nr),
                         data->in_min[nr]);
         mutex_unlock(&data->update_lock);
         return count;
 }
 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 via686a_data *data = i2c_get_clientdata(client);
+        struct via686a_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, nr);
-        via686a_write_value(client, VIA686A_REG_IN_MAX(nr),
+        via686a_write_value(data, VIA686A_REG_IN_MAX(nr),
                         data->in_max[nr]);
         mutex_unlock(&data->update_lock);
         return count;
@@ -429,26 +424,24 @@ static ssize_t show_temp_hyst(struct device *dev, char *buf, int nr) {
 }
 static ssize_t set_temp_over(struct device *dev, const char *buf,
                 size_t count, int nr) {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct via686a_data *data = i2c_get_clientdata(client);
+        struct via686a_data *data = dev_get_drvdata(dev);
         int val = simple_strtol(buf, NULL, 10);
 
         mutex_lock(&data->update_lock);
         data->temp_over[nr] = TEMP_TO_REG(val);
-        via686a_write_value(client, VIA686A_REG_TEMP_OVER[nr],
+        via686a_write_value(data, VIA686A_REG_TEMP_OVER[nr],
                             data->temp_over[nr]);
         mutex_unlock(&data->update_lock);
         return count;
 }
 static ssize_t set_temp_hyst(struct device *dev, const char *buf,
                 size_t count, int nr) {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct via686a_data *data = i2c_get_clientdata(client);
+        struct via686a_data *data = dev_get_drvdata(dev);
         int val = simple_strtol(buf, NULL, 10);
 
         mutex_lock(&data->update_lock);
         data->temp_hyst[nr] = TEMP_TO_REG(val);
-        via686a_write_value(client, VIA686A_REG_TEMP_HYST[nr],
+        via686a_write_value(data, VIA686A_REG_TEMP_HYST[nr],
                             data->temp_hyst[nr]);
         mutex_unlock(&data->update_lock);
         return count;
@@ -505,28 +498,26 @@ static ssize_t show_fan_div(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 via686a_data *data = i2c_get_clientdata(client);
+        struct via686a_data *data = dev_get_drvdata(dev);
         int val = simple_strtol(buf, NULL, 10);
 
         mutex_lock(&data->update_lock);
         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
-        via686a_write_value(client, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
+        via686a_write_value(data, VIA686A_REG_FAN_MIN(nr+1), data->fan_min[nr]);
         mutex_unlock(&data->update_lock);
         return count;
 }
 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 via686a_data *data = i2c_get_clientdata(client);
+        struct via686a_data *data = dev_get_drvdata(dev);
         int val = simple_strtol(buf, NULL, 10);
         int old;
 
         mutex_lock(&data->update_lock);
-        old = via686a_read_value(client, VIA686A_REG_FANDIV);
+        old = via686a_read_value(data, VIA686A_REG_FANDIV);
         data->fan_div[nr] = DIV_TO_REG(val);
         old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
-        via686a_write_value(client, VIA686A_REG_FANDIV, old);
+        via686a_write_value(data, VIA686A_REG_FANDIV, old);
         mutex_unlock(&data->update_lock);
         return count;
 }
@@ -570,6 +561,14 @@ 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
+                         *devattr, char *buf)
+{
+        struct via686a_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 *via686a_attributes[] = {
         &dev_attr_in0_input.attr,
         &dev_attr_in1_input.attr,
@@ -605,6 +604,7 @@ static struct attribute *via686a_attributes[] = {
         &dev_attr_fan2_div.attr,
 
         &dev_attr_alarms.attr,
+        &dev_attr_name.attr,
         NULL
 };
 
@@ -612,58 +612,29 @@ static const struct attribute_group via686a_group = {
         .attrs = via686a_attributes,
 };
 
-/* The driver. I choose to use type i2c_driver, as at is identical to both
-   smbus_driver and isa_driver, and clients could be of either kind */
-static struct i2c_driver via686a_driver = {
+static struct platform_driver via686a_driver = {
         .driver = {
                 .owner  = THIS_MODULE,
                 .name   = "via686a",
         },
-        .attach_adapter = via686a_detect,
-        .detach_client  = via686a_detach_client,
+        .probe          = via686a_probe,
+        .remove         = __devexit_p(via686a_remove),
 };
 
 
 /* This is called when the module is loaded */
-static int via686a_detect(struct i2c_adapter *adapter)
+static int __devinit via686a_probe(struct platform_device *pdev)
 {
-        struct i2c_client *new_client;
         struct via686a_data *data;
-        int err = 0;
-        const char client_name[] = "via686a";
-        u16 val;
-
-        /* 8231 requires multiple of 256, we enforce that on 686 as well */
-        if (force_addr) {
-                address = force_addr & 0xFF00;
-                dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
-                         address);
-                if (PCIBIOS_SUCCESSFUL !=
-                    pci_write_config_word(s_bridge, VIA686A_BASE_REG, address))
-                        return -ENODEV;
-        }
-        if (PCIBIOS_SUCCESSFUL !=
-            pci_read_config_word(s_bridge, VIA686A_ENABLE_REG, &val))
-                return -ENODEV;
-        if (!(val & 0x0001)) {
-                if (force_addr) {
-                        dev_info(&adapter->dev, "enabling sensors\n");
-                        if (PCIBIOS_SUCCESSFUL !=
-                            pci_write_config_word(s_bridge, VIA686A_ENABLE_REG,
-                                                  val | 0x0001))
-                                return -ENODEV;
-                } else {
-                        dev_warn(&adapter->dev, "sensors disabled - enable "
-                                 "with force_addr=0x%x\n", address);
-                        return -ENODEV;
-                }
-        }
+        struct resource *res;
+        int err;
 
         /* Reserve the ISA region */
-        if (!request_region(address, VIA686A_EXTENT,
+        res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+        if (!request_region(res->start, VIA686A_EXTENT,
                             via686a_driver.driver.name)) {
-                dev_err(&adapter->dev, "region 0x%x already in use!\n",
-                        address);
+                dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
+                        (unsigned long)res->start, (unsigned long)res->end);
                 return -ENODEV;
         }
 
@@ -672,30 +643,19 @@ static int via686a_detect(struct i2c_adapter *adapter)
                 goto exit_release;
         }
 
-        new_client = &data->client;
-        i2c_set_clientdata(new_client, data);
-        new_client->addr = address;
-        new_client->adapter = adapter;
-        new_client->driver = &via686a_driver;
-        new_client->flags = 0;
-
-        /* Fill in the remaining client fields and put into the global list */
-        strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
-
-        data->valid = 0;
+        platform_set_drvdata(pdev, data);
+        data->addr = res->start;
+        data->name = "via686a";
         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 VIA686A chip */
-        via686a_init_client(new_client);
+        via686a_init_device(data);
 
         /* Register sysfs hooks */
-        if ((err = sysfs_create_group(&new_client->dev.kobj, &via686a_group)))
-                goto exit_detach;
+        if ((err = sysfs_create_group(&pdev->dev.kobj, &via686a_group)))
+                goto exit_free;
 
-        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;
@@ -704,52 +664,46 @@ static int via686a_detect(struct i2c_adapter *adapter)
         return 0;
 
 exit_remove_files:
-        sysfs_remove_group(&new_client->dev.kobj, &via686a_group);
-exit_detach:
-        i2c_detach_client(new_client);
+        sysfs_remove_group(&pdev->dev.kobj, &via686a_group);
 exit_free:
         kfree(data);
 exit_release:
-        release_region(address, VIA686A_EXTENT);
+        release_region(res->start, VIA686A_EXTENT);
         return err;
 }
 
-static int via686a_detach_client(struct i2c_client *client)
+static int __devexit via686a_remove(struct platform_device *pdev)
 {
-        struct via686a_data *data = i2c_get_clientdata(client);
-        int err;
+        struct via686a_data *data = platform_get_drvdata(pdev);
 
         hwmon_device_unregister(data->class_dev);
-        sysfs_remove_group(&client->dev.kobj, &via686a_group);
+        sysfs_remove_group(&pdev->dev.kobj, &via686a_group);
 
-        if ((err = i2c_detach_client(client)))
-                return err;
-
-        release_region(client->addr, VIA686A_EXTENT);
+        release_region(data->addr, VIA686A_EXTENT);
+        platform_set_drvdata(pdev, NULL);
         kfree(data);
 
         return 0;
 }
 
-static void via686a_init_client(struct i2c_client *client)
+static void __devinit via686a_init_device(struct via686a_data *data)
 {
         u8 reg;
 
         /* Start monitoring */
-        reg = via686a_read_value(client, VIA686A_REG_CONFIG);
-        via686a_write_value(client, VIA686A_REG_CONFIG, (reg|0x01)&0x7F);
+        reg = via686a_read_value(data, VIA686A_REG_CONFIG);
+        via686a_write_value(data, VIA686A_REG_CONFIG, (reg | 0x01) & 0x7F);
 
         /* Configure temp interrupt mode for continuous-interrupt operation */
-        reg = via686a_read_value(client, VIA686A_REG_TEMP_MODE);
-        via686a_write_value(client, VIA686A_REG_TEMP_MODE,
+        reg = via686a_read_value(data, VIA686A_REG_TEMP_MODE);
+        via686a_write_value(data, VIA686A_REG_TEMP_MODE,
                             (reg & ~VIA686A_TEMP_MODE_MASK)
                             | VIA686A_TEMP_MODE_CONTINUOUS);
 }
 
 static struct via686a_data *via686a_update_device(struct device *dev)
 {
-        struct i2c_client *client = to_i2c_client(dev);
-        struct via686a_data *data = i2c_get_clientdata(client);
+        struct via686a_data *data = dev_get_drvdata(dev);
         int i;
 
         mutex_lock(&data->update_lock);
@@ -758,27 +712,27 @@ static struct via686a_data *via686a_update_device(struct device *dev)
             || !data->valid) {
                 for (i = 0; i <= 4; i++) {
                         data->in[i] =
-                            via686a_read_value(client, VIA686A_REG_IN(i));
-                        data->in_min[i] = via686a_read_value(client,
+                            via686a_read_value(data, VIA686A_REG_IN(i));
+                        data->in_min[i] = via686a_read_value(data,
                                                              VIA686A_REG_IN_MIN
                                                              (i));
                         data->in_max[i] =
-                            via686a_read_value(client, VIA686A_REG_IN_MAX(i));
+                            via686a_read_value(data, VIA686A_REG_IN_MAX(i));
                 }
                 for (i = 1; i <= 2; i++) {
                         data->fan[i - 1] =
-                            via686a_read_value(client, VIA686A_REG_FAN(i));
-                        data->fan_min[i - 1] = via686a_read_value(client,
+                            via686a_read_value(data, VIA686A_REG_FAN(i));
+                        data->fan_min[i - 1] = via686a_read_value(data,
                                                      VIA686A_REG_FAN_MIN(i));
                 }
                 for (i = 0; i <= 2; i++) {
-                        data->temp[i] = via686a_read_value(client,
+                        data->temp[i] = via686a_read_value(data,
                                                  VIA686A_REG_TEMP[i]) << 2;
                         data->temp_over[i] =
-                            via686a_read_value(client,
+                            via686a_read_value(data,
                                                VIA686A_REG_TEMP_OVER[i]);
                         data->temp_hyst[i] =
-                            via686a_read_value(client,
+                            via686a_read_value(data,
                                                VIA686A_REG_TEMP_HYST[i]);
                 }
                 /* add in lower 2 bits
@@ -786,23 +740,23 @@ static struct via686a_data *via686a_update_device(struct device *dev)
                    temp2 uses bits 5-4 of VIA686A_REG_TEMP_LOW23
                    temp3 uses bits 7-6 of VIA686A_REG_TEMP_LOW23
                  */
-                data->temp[0] |= (via686a_read_value(client,
+                data->temp[0] |= (via686a_read_value(data,
                                                      VIA686A_REG_TEMP_LOW1)
                                   & 0xc0) >> 6;
                 data->temp[1] |=
-                    (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
+                    (via686a_read_value(data, VIA686A_REG_TEMP_LOW23) &
                      0x30) >> 4;
                 data->temp[2] |=
-                    (via686a_read_value(client, VIA686A_REG_TEMP_LOW23) &
+                    (via686a_read_value(data, VIA686A_REG_TEMP_LOW23) &
                      0xc0) >> 6;
 
-                i = via686a_read_value(client, VIA686A_REG_FANDIV);
+                i = via686a_read_value(data, VIA686A_REG_FANDIV);
                 data->fan_div[0] = (i >> 4) & 0x03;
                 data->fan_div[1] = i >> 6;
                 data->alarms =
-                    via686a_read_value(client,
+                    via686a_read_value(data,
                                        VIA686A_REG_ALARM1) |
-                    (via686a_read_value(client, VIA686A_REG_ALARM2) << 8);
+                    (via686a_read_value(data, VIA686A_REG_ALARM2) << 8);
                 data->last_updated = jiffies;
                 data->valid = 1;
         }
@@ -819,32 +773,102 @@ static struct pci_device_id via686a_pci_ids[] = {
 
 MODULE_DEVICE_TABLE(pci, via686a_pci_ids);
 
+static int __devinit via686a_device_add(unsigned short address)
+{
+        struct resource res = {
+                .start  = address,
+                .end    = address + VIA686A_EXTENT - 1,
+                .name   = "via686a",
+                .flags  = IORESOURCE_IO,
+        };
+        int err;
+
+        pdev = platform_device_alloc("via686a", address);
+        if (!pdev) {
+                err = -ENOMEM;
+                printk(KERN_ERR "via686a: Device allocation failed\n");
+                goto exit;
+        }
+
+        err = platform_device_add_resources(pdev, &res, 1);
+        if (err) {
+                printk(KERN_ERR "via686a: Device resource addition failed "
+                       "(%d)\n", err);
+                goto exit_device_put;
+        }
+
+        err = platform_device_add(pdev);
+        if (err) {
+                printk(KERN_ERR "via686a: 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 via686a_pci_probe(struct pci_dev *dev,
                                        const struct pci_device_id *id)
 {
-        u16 val;
+        u16 address, val;
 
+        if (force_addr) {
+                address = force_addr & ~(VIA686A_EXTENT - 1);
+                dev_warn(&dev->dev, "Forcing ISA address 0x%x\n", address);
+                if (PCIBIOS_SUCCESSFUL !=
+                    pci_write_config_word(dev, VIA686A_BASE_REG, address | 1))
+                        return -ENODEV;
+        }
         if (PCIBIOS_SUCCESSFUL !=
             pci_read_config_word(dev, VIA686A_BASE_REG, &val))
                 return -ENODEV;
 
         address = val & ~(VIA686A_EXTENT - 1);
-        if (address == 0 && force_addr == 0) {
+        if (address == 0) {
                 dev_err(&dev->dev, "base address not set - upgrade BIOS "
                         "or use force_addr=0xaddr\n");
                 return -ENODEV;
         }
 
-        s_bridge = pci_dev_get(dev);
-        if (i2c_isa_add_driver(&via686a_driver)) {
-                pci_dev_put(s_bridge);
-                s_bridge = NULL;
+        if (PCIBIOS_SUCCESSFUL !=
+            pci_read_config_word(dev, VIA686A_ENABLE_REG, &val))
+                return -ENODEV;
+        if (!(val & 0x0001)) {
+                if (!force_addr) {
+                        dev_warn(&dev->dev, "Sensors disabled, enable "
+                                 "with force_addr=0x%x\n", address);
+                        return -ENODEV;
+                }
+
+                dev_warn(&dev->dev, "Enabling sensors\n");
+                if (PCIBIOS_SUCCESSFUL !=
+                    pci_write_config_word(dev, VIA686A_ENABLE_REG,
+                                          val | 0x0001))
+                        return -ENODEV;
         }
 
+        if (platform_driver_register(&via686a_driver))
+                goto exit;
+
+        /* Sets global pdev as a side effect */
+        if (via686a_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.
          */
+        s_bridge = pci_dev_get(dev);
+        return -ENODEV;
+
+exit_unregister:
+        platform_driver_unregister(&via686a_driver);
+exit:
         return -ENODEV;
 }
 
@@ -863,7 +887,8 @@ static void __exit sm_via686a_exit(void)
 {
         pci_unregister_driver(&via686a_pci_driver);
         if (s_bridge != NULL) {
-                i2c_isa_del_driver(&via686a_driver);
+                platform_device_unregister(pdev);
+                platform_driver_unregister(&via686a_driver);
                 pci_dev_put(s_bridge);
                 s_bridge = NULL;
         }