hwmon: (pc87427) Add support for the second logical device

The second logical device contains the voltage and temperature
registers. We have to extend the driver to support a second logical
device before we can add support for these features.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>

diff --git a/drivers/hwmon/pc87427.c b/drivers/hwmon/pc87427.c
index 8698227..129a33c 100644 (file)
--- a/drivers/hwmon/pc87427.c
+++ b/drivers/hwmon/pc87427.c
@@ -65,6 +65,7 @@ struct pc87427_data {
 };
 
 struct pc87427_sio_data {
+       unsigned short address[2];
        u8 has_fanin;
        u8 has_fanout;
 };
@@ -608,6 +609,46 @@ static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
  * Device detection, attach and detach
  */
 
+static void pc87427_release_regions(struct platform_device *pdev, int count)
+{
+       struct resource *res;
+       int i;
+
+       for (i = 0; i < count; i++) {
+               res = platform_get_resource(pdev, IORESOURCE_IO, i);
+               release_region(res->start, resource_size(res));
+       }
+}
+
+static int __devinit pc87427_request_regions(struct platform_device *pdev,
+                                            int count)
+{
+       struct resource *res;
+       int i, err = 0;
+
+       for (i = 0; i < count; i++) {
+               res = platform_get_resource(pdev, IORESOURCE_IO, i);
+               if (!res) {
+                       err = -ENOENT;
+                       dev_err(&pdev->dev, "Missing resource #%d\n", i);
+                       break;
+               }
+               if (!request_region(res->start, resource_size(res), DRVNAME)) {
+                       err = -EBUSY;
+                       dev_err(&pdev->dev,
+                               "Failed to request region 0x%lx-0x%lx\n",
+                               (unsigned long)res->start,
+                               (unsigned long)res->end);
+                       break;
+               }
+       }
+
+       if (err && i)
+               pc87427_release_regions(pdev, i);
+
+       return err;
+}
+
 static void __devinit pc87427_init_device(struct device *dev)
 {
        struct pc87427_sio_data *sio_data = dev->platform_data;
@@ -664,9 +705,9 @@ static void __devinit pc87427_init_device(struct device *dev)
 
 static int __devinit pc87427_probe(struct platform_device *pdev)
 {
+       struct pc87427_sio_data *sio_data = pdev->dev.platform_data;
        struct pc87427_data *data;
-       struct resource *res;
-       int i, err;
+       int i, err, res_count;
 
        data = kzalloc(sizeof(struct pc87427_data), GFP_KERNEL);
        if (!data) {
@@ -675,16 +716,13 @@ static int __devinit pc87427_probe(struct platform_device *pdev)
                goto exit;
        }
 
-       /* This will need to be revisited when we add support for
-          temperature and voltage monitoring. */
-       res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-       if (!request_region(res->start, resource_size(res), DRVNAME)) {
-               err = -EBUSY;
-               dev_err(&pdev->dev, "Failed to request region 0x%lx-0x%lx\n",
-                       (unsigned long)res->start, (unsigned long)res->end);
+       data->address[0] = sio_data->address[0];
+       data->address[1] = sio_data->address[1];
+       res_count = (data->address[0] != 0) + (data->address[1] != 0);
+
+       err = pc87427_request_regions(pdev, res_count);
+       if (err)
                goto exit_kfree;
-       }
-       data->address[0] = res->start;
 
        mutex_init(&data->lock);
        data->name = "pc87427";
@@ -733,7 +771,7 @@ exit_remove_files:
                sysfs_remove_group(&pdev->dev.kobj, &pc87427_group_pwm[i]);
        }
 exit_release_region:
-       release_region(res->start, resource_size(res));
+       pc87427_release_regions(pdev, res_count);
 exit_kfree:
        platform_set_drvdata(pdev, NULL);
        kfree(data);
@@ -744,8 +782,9 @@ exit:
 static int __devexit pc87427_remove(struct platform_device *pdev)
 {
        struct pc87427_data *data = platform_get_drvdata(pdev);
-       struct resource *res;
-       int i;
+       int i, res_count;
+
+       res_count = (data->address[0] != 0) + (data->address[1] != 0);
 
        hwmon_device_unregister(data->hwmon_dev);
        device_remove_file(&pdev->dev, &dev_attr_name);
@@ -762,8 +801,7 @@ static int __devexit pc87427_remove(struct platform_device *pdev)
        platform_set_drvdata(pdev, NULL);
        kfree(data);
 
-       res = platform_get_resource(pdev, IORESOURCE_IO, 0);
-       release_region(res->start, resource_size(res));
+       pc87427_release_regions(pdev, res_count);
 
        return 0;
 }
@@ -778,29 +816,37 @@ static struct platform_driver pc87427_driver = {
        .remove         = __devexit_p(pc87427_remove),
 };
 
-static int __init pc87427_device_add(unsigned short address,
-                                    const struct pc87427_sio_data *sio_data)
+static int __init pc87427_device_add(const struct pc87427_sio_data *sio_data)
 {
-       struct resource res = {
-               .start  = address,
-               .end    = address + REGION_LENGTH - 1,
-               .name   = logdev_str[0],
-               .flags  = IORESOURCE_IO,
+       struct resource res[2] = {
+               { .flags        = IORESOURCE_IO },
+               { .flags        = IORESOURCE_IO },
        };
-       int err;
+       int err, i, res_count;
 
-       err = acpi_check_resource_conflict(&res);
-       if (err)
-               goto exit;
+       res_count = 0;
+       for (i = 0; i < 2; i++) {
+               if (!sio_data->address[i])
+                       continue;
+               res[res_count].start = sio_data->address[i];
+               res[res_count].end = sio_data->address[i] + REGION_LENGTH - 1;
+               res[res_count].name = logdev_str[i];
 
-       pdev = platform_device_alloc(DRVNAME, address);
+               err = acpi_check_resource_conflict(&res[res_count]);
+               if (err)
+                       goto exit;
+
+               res_count++;
+       }
+
+       pdev = platform_device_alloc(DRVNAME, res[0].start);
        if (!pdev) {
                err = -ENOMEM;
                printk(KERN_ERR DRVNAME ": Device allocation failed\n");
                goto exit;
        }
 
-       err = platform_device_add_resources(pdev, &res, 1);
+       err = platform_device_add_resources(pdev, res, res_count);
        if (err) {
                printk(KERN_ERR DRVNAME ": Device resource addition failed "
                       "(%d)\n", err);
@@ -829,8 +875,7 @@ exit:
        return err;
 }
 
-static int __init pc87427_find(int sioaddr, unsigned short *address,
-                              struct pc87427_sio_data *sio_data)
+static int __init pc87427_find(int sioaddr, struct pc87427_sio_data *sio_data)
 {
        u16 val;
        u8 cfg, cfg_b;
@@ -844,7 +889,7 @@ static int __init pc87427_find(int sioaddr, unsigned short *address,
        }
 
        for (i = 0; i < 2; i++) {
-               address[i] = 0;
+               sio_data->address[i] = 0;
                /* Select logical device */
                superio_outb(sioaddr, SIOREG_LDSEL, logdev[i]);
 
@@ -869,7 +914,13 @@ static int __init pc87427_find(int sioaddr, unsigned short *address,
                               "for logical device 0x%02x\n", logdev[i]);
                        continue;
                }
-               address[i] = val;
+               sio_data->address[i] = val;
+       }
+
+       /* No point in loading the driver if everything is disabled */
+       if (!sio_data->address[0] && !sio_data->address[1]) {
+               err = -ENODEV;
+               goto exit;
        }
 
        /* Check which fan inputs are wired */
@@ -923,16 +974,10 @@ exit:
 static int __init pc87427_init(void)
 {
        int err;
-       unsigned short address[2];
        struct pc87427_sio_data sio_data;
 
-       if (pc87427_find(0x2e, address, &sio_data)
-        && pc87427_find(0x4e, address, &sio_data))
-               return -ENODEV;
-
-       /* For now the driver only handles fans so we only care about the
-          first address. */
-       if (!address[0])
+       if (pc87427_find(0x2e, &sio_data)
+        && pc87427_find(0x4e, &sio_data))
                return -ENODEV;
 
        err = platform_driver_register(&pc87427_driver);
@@ -940,7 +985,7 @@ static int __init pc87427_init(void)
                goto exit;
 
        /* Sets global pdev as a side effect */
-       err = pc87427_device_add(address[0], &sio_data);
+       err = pc87427_device_add(&sio_data);
        if (err)
                goto exit_driver;