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path: root/drivers/hwmon
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-rw-r--r--drivers/hwmon/pc87427.c129
1 files changed, 87 insertions, 42 deletions
diff --git a/drivers/hwmon/pc87427.c b/drivers/hwmon/pc87427.c
index 869822785b4..129a33ce3fe 100644
--- 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;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 13:36:26 +0000