linux-kernel - [PATCH v2 0/1] hwmon:max6697: Allow max6581 to create tempX

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Message-Id: <20200706221001.1996816-1-linchuyuan@google.com>
Date:   Mon,  6 Jul 2020 22:10:00 +0000
From:   Chu Lin <linchuyuan@...gle.com>
To:     linux@...ck-us.net
Cc:     belgaied@...gle.com, jasonling@...gle.com, jdelvare@...e.com,
        linchuyuan@...gle.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, zhongqil@...gle.com
Subject: [PATCH v2 0/1] hwmon:max6697: Allow max6581 to create tempX_offset

Per max6581, reg 4d and reg 4e is used for temperature read offset.
This patch will let the user specify the temperature read offset for
max6581. This patch is tested on max6581 and only applies to max6581.

Testing:
echo 16250 > temp2_offset
cat temp2_offset
16250

echo 17500 > temp3_offset
cat temp3_offset
17500
cat temp4_offset
0
cat temp2_offset
17500

echo 0 > temp2_offset
cat temp2_offset
0
cat temp3_offset
17500

echo -0 > temp2_offset
cat temp2_offset
0

echo -100000 > temp2_offset
cat temp2_input
4875

echo 10000 > temp2_offset
cat temp2_input
47125

echo -2000 > temp2_offset
cat temp2_input
34875

echo -0 > temp2_offset
cat temp2_input
37000

Signed-off-by: Chu Lin <linchuyuan@...gle.com>
---
ChangeLog v1 -> v2:
  - Simplify the offset reg raw value to milli ceisus conversion
  - Substitute the temp1_offset with dummy attr
  - Avoid using double negative in the macro definition
  - Return the actual error when i2c read/write is failed
  - clamp the value to MAX or MIN respectively if an out of range input is given
  - Provide mux protection when multiple i2c accesses is required

Chu Lin (1):
  hwmon:max6697: Allow max6581 to create tempX_offset

 drivers/hwmon/max6697.c | 100 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 96 insertions(+), 4 deletions(-)

-- 
2.27.0.383.g050319c2ae-goog