linux-kernel - [PATCH 1/1] HWMON: TMP102 - Added support for 12 bit data

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Message-Id: <1308716932-25562-1-git-send-email-bkankur@gmail.com>
Date:	Wed, 22 Jun 2011 09:58:52 +0530
From:	Ankur Patel <bkankur@...il.com>
To:	Jean Delvare <khali@...ux-fr.org>,
	Guenter Roeck <guenter.roeck@...csson.com>
Cc:	linux-kernel@...r.kernel.org, Ankur Patel <ankur.patel@...pment.in>
Subject: [PATCH 1/1] HWMON: TMP102 - Added support for 12 bit data

From: Ankur Patel <ankur.patel@...pment.in>

In tmp102.ko driver support for 12 bit data is added.

Signed-off-by: Ankur Patel <ankur.patel@...pment.in>
---
 drivers/hwmon/tmp102.c |   28 ++++++++++++++++++++--------
 1 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c
index 5bd1949..6e03a87 100644
--- a/drivers/hwmon/tmp102.c
+++ b/drivers/hwmon/tmp102.c
@@ -47,6 +47,9 @@
 #define	TMP102_TLOW_REG			0x02
 #define	TMP102_THIGH_REG		0x03
 
+#define TMP102_CONFIG  (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
+#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
+
 struct tmp102 {
 	struct device *hwmon_dev;
 	struct mutex lock;
@@ -68,16 +71,26 @@ static inline int tmp102_write_reg(struct i2c_client *client, u8 reg, u16 val)
 	return i2c_smbus_write_word_data(client, reg, swab16(val));
 }
 
-/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
+/* convert left adjusted TMP102 register value to milliCelsius for 13 bit &
+ * 12 bit by dividing with 128 & 256 respectively*/
 static inline int tmp102_reg_to_mC(s16 val)
 {
-	return ((val & ~0x01) * 1000) / 128;
+	#if TMP102_CONFIG & TMP102_CONF_EM
+		return ((val & ~0x01) * 1000) / 128;
+	#else
+		return ((val & ~0x01) * 1000) / 256;
+	#endif
 }
 
-/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
+/* convert milliCelsius to left adjusted TMP102 register value for 13 bit &
+ * 12 bit by multiplying with 128 & 256 respectivley*/
 static inline u16 tmp102_mC_to_reg(int val)
 {
-	return (val * 128) / 1000;
+	#if TMP102_CONFIG & TMP102_CONF_EM
+		return (val * 128) / 1000;
+	#else
+		return (val * 256) / 1000;
+	#endif
 }
 
 static const u8 tmp102_reg[] = {
@@ -126,7 +139,9 @@ static ssize_t tmp102_set_temp(struct device *dev,
 
 	if (strict_strtol(buf, 10, &val) < 0)
 		return -EINVAL;
-	val = SENSORS_LIMIT(val, -256000, 255000);
+	/* It will limit the Input temperature range to -55 Deg. Cel to
+	 * 150 Deg. Cel */
+	val = SENSORS_LIMIT(val, -55000, 150000);
 
 	mutex_lock(&tmp102->lock);
 	tmp102->temp[sda->index] = val;
@@ -155,9 +170,6 @@ static const struct attribute_group tmp102_attr_group = {
 	.attrs = tmp102_attributes,
 };
 
-#define TMP102_CONFIG  (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
-#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
-
 static int __devinit tmp102_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
-- 
1.7.0.4

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