linux-kernel - [PATCH] HID: i2c-hid: use correct type for ACPI

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Message-Id: <1376910077-24433-1-git-send-email-mika.westerberg@linux.intel.com>
Date:	Mon, 19 Aug 2013 14:01:17 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH] HID: i2c-hid: use correct type for ACPI _DSM parameter

ACPI 5.0 specification requires the fourth parameter to the _DSM (Device
Specific Method) to be of type package instead of integer. Failing to do
that we get following warning on the console:

  ACPI Warning: \_SB_.PCI0.I2C1.TPL0._DSM: Argument #4 type mismatch - Found [Integer],
                ACPI requires [Package] (20130517/nsarguments-95)

Fix this by passing an empty package to the _DSM method. The HID over I2C
specification doesn't require any specific values to be passed with this
parameter.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
 drivers/hid/i2c-hid/i2c-hid.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 879b0ed..d2e0eea 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -897,8 +897,9 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client,
 	params[1].integer.value = 1;
 	params[2].type = ACPI_TYPE_INTEGER;
 	params[2].integer.value = 1; /* HID function */
-	params[3].type = ACPI_TYPE_INTEGER;
-	params[3].integer.value = 0;
+	params[3].type = ACPI_TYPE_PACKAGE;
+	params[3].package.count = 0;
+	params[3].package.elements = NULL;
 
 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf))) {
 		dev_err(&client->dev, "device _DSM execution failed\n");
-- 
1.8.4.rc2

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