From: Eric Miao Date: Mon, 16 Jan 2012 21:51:45 +0000 (+0100) Subject: hwmon: (max1111) Change sysfs interface to in[0-3]_input in millivolts X-Git-Tag: upstream/snapshot3+hdmi~8310^2~16 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=012f3b9118c7aaa3549f89299386f92b6580d235;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git hwmon: (max1111) Change sysfs interface to in[0-3]_input in millivolts This patch fixed the inconsistent max1111 sysfs interface as pointed out by Jean Delvare: It was pointed to me that the max1111 driver doesn't implement the standard sysfs interface for hwmon drivers (as described in Documentation/hwmon/sysfs-interface). It exports files adc[0-3]_in, which aren't part of the standard interface. Presumably these should be renamed to in[0-3]_input. Renaming them is probably not sufficient though, as I see no scaling done in the driver. As the MAX1111 chip has a documented full scale of 2.048V, I take it that the LSB of the ADC has a weight of 8 mV. Exporting raw register values to user-space is not OK. Reported-by: Jean Delvare Signed-off-by: Eric Miao Signed-off-by: Jean Delvare --- diff --git a/drivers/hwmon/max1111.c b/drivers/hwmon/max1111.c index 84ef3a8..482ca90 100644 --- a/drivers/hwmon/max1111.c +++ b/drivers/hwmon/max1111.c @@ -106,11 +106,14 @@ static ssize_t show_adc(struct device *dev, if (ret < 0) return ret; - return sprintf(buf, "%d\n", ret); + /* assume the reference voltage to be 2.048V, with an 8-bit sample, + * the LSB weight is 8mV + */ + return sprintf(buf, "%d\n", ret * 8); } #define MAX1111_ADC_ATTR(_id) \ - SENSOR_DEVICE_ATTR(adc##_id##_in, S_IRUGO, show_adc, NULL, _id) + SENSOR_DEVICE_ATTR(in##_id##_input, S_IRUGO, show_adc, NULL, _id) static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); static MAX1111_ADC_ATTR(0); @@ -120,10 +123,10 @@ static MAX1111_ADC_ATTR(3); static struct attribute *max1111_attributes[] = { &dev_attr_name.attr, - &sensor_dev_attr_adc0_in.dev_attr.attr, - &sensor_dev_attr_adc1_in.dev_attr.attr, - &sensor_dev_attr_adc2_in.dev_attr.attr, - &sensor_dev_attr_adc3_in.dev_attr.attr, + &sensor_dev_attr_in0_input.dev_attr.attr, + &sensor_dev_attr_in1_input.dev_attr.attr, + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_in3_input.dev_attr.attr, NULL, };