[rtc-linux] Re: [PATCH v2] rtc: rtc-ds1307: add temperature sensor support for ds3231

2016-01-23 9:55 GMT+09:00 Guenter Roeck [off-list ref]:

On 01/22/2016 09:57 AM, Akinobu Mita wrote:

quoted

DS3231 has the temperature registers with a resolution of 0.25
degree celsius.  This enables to get the value through hwmon.

        # cat /sys/class/i2c-adapter/i2c-2/2-0068/hwmon/hwmon0/temp1_input
        21000

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Alessandro Zummo <redacted>
Cc: Alexandre Belloni <redacted>
Cc: rtc-linux@googlegroups.com
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: lm-sensors@lm-sensors.org
---
* v2
- convert to use hwmon framework, suggested by Alexandre Belloni

  drivers/rtc/rtc-ds1307.c | 122
+++++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 122 insertions(+)

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c

Something else, on top of my previous comments.

quoted

+#if IS_ENABLED(CONFIG_HWMON)

I don't think this will work as intended. It will fail if the ds1307 driver
is built into the kernel but hwmon is built as module.

Check configurations such as BE2NET_HWMON or NET_DSA_HWMON for ideas
on how to handle this problem.

OK.  I'll add CONFIG_RTC_DRV_DS1307_HWMON and do something similar.

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