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authorPetr Vandrovec <vandrove@vc.cvut.cz>2005-10-07 23:11:03 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2005-10-28 14:02:09 -0700
commitada0c2f8fa087dc1dbc34e096c318739b1d6381a (patch)
treee7f80d1336e2190c138fd4226438195e2f67839d /drivers/hwmon
parentbf813b314a2271c3f3903eb3279ebf5e09b3d27a (diff)
downloadlinux-stericsson-ada0c2f8fa087dc1dbc34e096c318739b1d6381a.tar.gz
[PATCH] hwmon: Fix w83627ehf/hf vs PNPACPI conflict (bug #4014)
This patch changes w83627hf and w83627ehf drivers to reserve only ports 0x295-0x296, instead of full 0x290-0x297 range. While some other sensors chips respond to all addresses in 0x290-0x297 range, Winbond chips respond to 0x295-0x296 only (this behavior is implied by documentation, and matches behavior observed on real systems). This is not problem alone, as no BIOS was found to put something at these unused addresses, and sensors chip itself provides nothing there as well. But in addition to only respond to these two addresses, also BIOS vendors report in their ACPI-PnP structures that there is some resource at I/O address 0x295 of length 2. And when later this hwmon driver attempts to request region with base 0x290/length 8, it fails as one request_region cannot span more than one device. Due to this we have to ask only for region this hardware really occupies, otherwise driver cannot be loaded on systems with ACPI-PnP enabled. Signed-off-by: Petr Vandrovec <vandrove@vc.cvut.cz> Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/w83627ehf.c13
-rw-r--r--drivers/hwmon/w83627hf.c21
2 files changed, 21 insertions, 13 deletions
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index b60efe8f8b26..685eeb766809 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -105,7 +105,9 @@ superio_exit(void)
* ISA constants
*/
-#define REGION_LENGTH 8
+#define REGION_ALIGNMENT ~7
+#define REGION_OFFSET 5
+#define REGION_LENGTH 2
#define ADDR_REG_OFFSET 5
#define DATA_REG_OFFSET 6
@@ -673,7 +675,8 @@ static int w83627ehf_detect(struct i2c_adapter *adapter)
struct w83627ehf_data *data;
int i, err = 0;
- if (!request_region(address, REGION_LENGTH, w83627ehf_driver.name)) {
+ if (!request_region(address + REGION_OFFSET, REGION_LENGTH,
+ w83627ehf_driver.name)) {
err = -EBUSY;
goto exit;
}
@@ -762,7 +765,7 @@ exit_detach:
exit_free:
kfree(data);
exit_release:
- release_region(address, REGION_LENGTH);
+ release_region(address + REGION_OFFSET, REGION_LENGTH);
exit:
return err;
}
@@ -776,7 +779,7 @@ static int w83627ehf_detach_client(struct i2c_client *client)
if ((err = i2c_detach_client(client)))
return err;
- release_region(client->addr, REGION_LENGTH);
+ release_region(client->addr + REGION_OFFSET, REGION_LENGTH);
kfree(data);
return 0;
@@ -807,7 +810,7 @@ static int __init w83627ehf_find(int sioaddr, unsigned short *addr)
superio_select(W83627EHF_LD_HWM);
val = (superio_inb(SIO_REG_ADDR) << 8)
| superio_inb(SIO_REG_ADDR + 1);
- *addr = val & ~(REGION_LENGTH - 1);
+ *addr = val & REGION_ALIGNMENT;
if (*addr == 0) {
superio_exit();
return -ENODEV;
diff --git a/drivers/hwmon/w83627hf.c b/drivers/hwmon/w83627hf.c
index 7f6f7280878d..494274d27f01 100644
--- a/drivers/hwmon/w83627hf.c
+++ b/drivers/hwmon/w83627hf.c
@@ -142,10 +142,14 @@ superio_exit(void)
#define WINB_BASE_REG 0x60
/* Constants specified below */
-/* Length of ISA address segment */
-#define WINB_EXTENT 8
+/* Alignment of the base address */
+#define WINB_ALIGNMENT ~7
-/* Where are the ISA address/data registers relative to the base address */
+/* Offset & size of I/O region we are interested in */
+#define WINB_REGION_OFFSET 5
+#define WINB_REGION_SIZE 2
+
+/* Where are the sensors address/data registers relative to the base address */
#define W83781D_ADDR_REG_OFFSET 5
#define W83781D_DATA_REG_OFFSET 6
@@ -981,7 +985,7 @@ static int __init w83627hf_find(int sioaddr, unsigned short *addr)
superio_select(W83627HF_LD_HWM);
val = (superio_inb(WINB_BASE_REG) << 8) |
superio_inb(WINB_BASE_REG + 1);
- *addr = val & ~(WINB_EXTENT - 1);
+ *addr = val & WINB_ALIGNMENT;
if (*addr == 0 && force_addr == 0) {
superio_exit();
return -ENODEV;
@@ -1000,9 +1004,10 @@ static int w83627hf_detect(struct i2c_adapter *adapter)
const char *client_name = "";
if(force_addr)
- address = force_addr & ~(WINB_EXTENT - 1);
+ address = force_addr & WINB_ALIGNMENT;
- if (!request_region(address, WINB_EXTENT, w83627hf_driver.name)) {
+ if (!request_region(address + WINB_REGION_OFFSET, WINB_REGION_SIZE,
+ w83627hf_driver.name)) {
err = -EBUSY;
goto ERROR0;
}
@@ -1148,7 +1153,7 @@ static int w83627hf_detect(struct i2c_adapter *adapter)
ERROR2:
kfree(data);
ERROR1:
- release_region(address, WINB_EXTENT);
+ release_region(address + WINB_REGION_OFFSET, WINB_REGION_SIZE);
ERROR0:
return err;
}
@@ -1163,7 +1168,7 @@ static int w83627hf_detach_client(struct i2c_client *client)
if ((err = i2c_detach_client(client)))
return err;
- release_region(client->addr, WINB_EXTENT);
+ release_region(client->addr + WINB_REGION_OFFSET, WINB_REGION_SIZE);
kfree(data);
return 0;