[PATCH 1/1] it87: Add param to ignore ACPI resource conflicts

[Ahmad Khalifa <ahmad@xxxxxxxxxx>]

Signed-off-by: Ahmad Khalifa <ahmad@xxxxxxxxxx>
---
 drivers/hwmon/it87.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 0e543dbe0a6b..6d71f6c481c8 100644
--- 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, false);
+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 */
@@ -2397,7 +2401,13 @@ static int __init it87_find(int sioaddr, unsigned short *address,
 		return err;
 
 	err = -ENODEV;
-	chip_type = force_id ? force_id : superio_inw(sioaddr, DEVID);
+	chip_type = superio_inw(sioaddr, DEVID);
+	/* check first so force_id doesn't register a second empty device */
+	if (chip_type == 0xffff)
+		goto exit;
+
+	if (force_id)
+		chip_type = force_id;
 
 	switch (chip_type) {
 	case IT8705F_DEVID:
@@ -3261,8 +3271,10 @@ 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)
-- 
2.30.2