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authorJean Delvare <khali@linux-fr.org>2007-05-08 17:21:59 +0200
committerJean Delvare <khali@hyperion.delvare>2007-05-08 17:21:59 +0200
commitce7ee4e80a72d3b1009ca232be8981de93c015f6 (patch)
treeb5160fd4a2b2276f7bd332f753b43f6d9752476b /drivers/hwmon/f71805f.c
parent00cb4739053fa0ce4594a7798a4095007a1c7c79 (diff)
hwmon: Request the I/O regions in platform drivers
My understanding of the resource management in the Linux 2.6 device driver model is that the devices should declare their resources, and then when a driver attaches to a device, it should request the resources it will be using, so as to mark them busy. This is how the PCI and PNP subsystems work, you can clearly see the two levels of resources (declaration and request) in /proc/ioports for these devices. So I believe that our platform hardware monitoring drivers should follow the same logic. At the moment, we only declare the resources but we do not request them. This patch adds the I/O region request and release calls. Signed-off-by: Jean Delvare <khali@linux-fr.org> Acked-by: Juerg Haefliger <juergh@gmail.com>
Diffstat (limited to 'drivers/hwmon/f71805f.c')
-rw-r--r--drivers/hwmon/f71805f.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/hwmon/f71805f.c b/drivers/hwmon/f71805f.c
index 7c297348712..cdbe309b8fc 100644
--- a/drivers/hwmon/f71805f.c
+++ b/drivers/hwmon/f71805f.c
@@ -35,6 +35,7 @@
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
+#include <linux/ioport.h>
#include <asm/io.h>
static struct platform_device *pdev;
@@ -1140,6 +1141,13 @@ static int __devinit f71805f_probe(struct platform_device *pdev)
}
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!request_region(res->start + ADDR_REG_OFFSET, 2, DRVNAME)) {
+ err = -EBUSY;
+ dev_err(&pdev->dev, "Failed to request region 0x%lx-0x%lx\n",
+ (unsigned long)(res->start + ADDR_REG_OFFSET),
+ (unsigned long)(res->start + ADDR_REG_OFFSET + 1));
+ goto exit_free;
+ }
data->addr = res->start;
data->name = names[sio_data->kind];
mutex_init(&data->update_lock);
@@ -1165,7 +1173,7 @@ static int __devinit f71805f_probe(struct platform_device *pdev)
/* Register sysfs interface files */
if ((err = sysfs_create_group(&pdev->dev.kobj, &f71805f_group)))
- goto exit_free;
+ goto exit_release_region;
if (data->has_in & (1 << 4)) { /* in4 */
if ((err = sysfs_create_group(&pdev->dev.kobj,
&f71805f_group_optin[0])))
@@ -1219,6 +1227,8 @@ exit_remove_files:
for (i = 0; i < 4; i++)
sysfs_remove_group(&pdev->dev.kobj, &f71805f_group_optin[i]);
sysfs_remove_group(&pdev->dev.kobj, &f71805f_group_pwm_freq);
+exit_release_region:
+ release_region(res->start + ADDR_REG_OFFSET, 2);
exit_free:
platform_set_drvdata(pdev, NULL);
kfree(data);
@@ -1229,6 +1239,7 @@ exit:
static int __devexit f71805f_remove(struct platform_device *pdev)
{
struct f71805f_data *data = platform_get_drvdata(pdev);
+ struct resource *res;
int i;
platform_set_drvdata(pdev, NULL);
@@ -1239,6 +1250,9 @@ static int __devexit f71805f_remove(struct platform_device *pdev)
sysfs_remove_group(&pdev->dev.kobj, &f71805f_group_pwm_freq);
kfree(data);
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ release_region(res->start + ADDR_REG_OFFSET, 2);
+
return 0;
}