hwmon: (it87) Add param to ignore ACPI resource conflicts

Add parameter to ignore ACPI resource conflicts as an alternate to using
'acpi_enforce_resources=lax'.

Some BIOSes reserve resources and don't use them and the system wide
parameter may result in failures to certain drivers.

Signed-off-by: Ahmad Khalifa <ahmad@khalifa.ws>
Link: https://lore.kernel.org/r/20221004210100.540120-2-ahmad@khalifa.ws
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 7bd154b..e920dd2 100644 (file)
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -69,6 +69,10 @@ static unsigned short force_id;
 module_param(force_id, ushort, 0);
 MODULE_PARM_DESC(force_id, "Override the detected device ID");
 
+static bool ignore_resource_conflict;
+module_param(ignore_resource_conflict, bool, 0);
+MODULE_PARM_DESC(ignore_resource_conflict, "Ignore ACPI resource conflict");
+
 static struct platform_device *it87_pdev[2];
 
 #define        REG_2E  0x2e    /* The register to read/write */
@@ -3261,8 +3265,10 @@ static int __init it87_device_add(int index, unsigned short address,
        int err;
 
        err = acpi_check_resource_conflict(&res);
-       if (err)
-               return err;
+       if (err) {
+               if (!ignore_resource_conflict)
+                       return err;
+       }
 
        pdev = platform_device_alloc(DRVNAME, address);
        if (!pdev)