linux-kernel - [PATCH 5/5] platform-x86: intel_mid_thermal: turn off thermistor voltage by default

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Message-ID: <20120126173943.16719.16596.stgit@bob.linux.org.uk>
Date:	Thu, 26 Jan 2012 17:39:46 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	mjg@...hat.com, platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] platform-x86: intel_mid_thermal: turn off thermistor
 voltage by default

From: Mika Westerberg <mika.westerberg@...ux.intel.com>

Instead of complaining that the voltage is on, we can just ask the MSIC to
turn the voltage off. This should save some power.

Voltage for thermistors is turned on when ADC conversion is initiated.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 drivers/platform/x86/intel_mid_thermal.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)


diff --git a/drivers/platform/x86/intel_mid_thermal.c b/drivers/platform/x86/intel_mid_thermal.c
index aef4979..a4e56be 100644
--- a/drivers/platform/x86/intel_mid_thermal.c
+++ b/drivers/platform/x86/intel_mid_thermal.c
@@ -360,8 +360,10 @@ static int mid_initialize_adc(struct device *dev)
 	if (ret)
 		return ret;
 
-	if (data & MSIC_ADCTHERM_MASK)
-		dev_warn(dev, "ADCTHERM already set");
+	data &= ~MSIC_ADCTHERM_MASK;
+	ret = intel_msic_reg_write(INTEL_MSIC_ADC1CNTL3, data);
+	if (ret)
+		return ret;
 
 	/* Index of the first channel in which the stop bit is set */
 	channel_index = find_free_channel();

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