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hwmon: MC13783: Add uid and die temperature sensor inputs

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The uid and die temperature can be read out on the ADIN7 using
input mux. Map uid and die temperature sensor to channels 16
and 17.

Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Andrey Gusakov 2018-03-27 17:19:49 +03:00 committed by Lee Jones
parent 60cc43fc88
commit ed645cccc0
3 changed files with 76 additions and 1 deletions
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60
drivers/hwmon/mc13783-adc.c
View file

@ -63,6 +63,10 @@ static int mc13783_adc_read(struct device *dev,
if (ret)
return ret;
/* ADIN7 subchannels */
if (channel >= 16)
channel = 7;
channel &= 0x7;
*val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
@ -111,6 +115,57 @@ static ssize_t mc13783_adc_read_gp(struct device *dev,
return sprintf(buf, "%u\n", val);
}
static ssize_t mc13783_adc_read_uid(struct device *dev,
struct device_attribute *devattr, char *buf)
{
unsigned int val;
struct platform_device *pdev = to_platform_device(dev);
kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
int ret = mc13783_adc_read(dev, devattr, &val);
if (ret)
return ret;
if (driver_data & MC13783_ADC_BPDIV2)
/* MC13892 have 1/2 divider, input range is [0, 4.800V] */
val = DIV_ROUND_CLOSEST(val * 4800, 1024);
else
/* MC13783 have 0.9 divider, input range is [0, 2.555V] */
val = DIV_ROUND_CLOSEST(val * 2555, 1024);
return sprintf(buf, "%u\n", val);
}
static ssize_t mc13783_adc_read_temp(struct device *dev,
struct device_attribute *devattr, char *buf)
{
unsigned int val;
struct platform_device *pdev = to_platform_device(dev);
kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
int ret = mc13783_adc_read(dev, devattr, &val);
if (ret)
return ret;
if (driver_data & MC13783_ADC_BPDIV2) {
/*
* MC13892:
* Die Temperature Read Out Code at 25C 680
* Temperature change per LSB +0.4244C
*/
ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);
} else {
/*
* MC13783:
* Die Temperature Read Out Code at 25C 282
* Temperature change per LSB -1.14C
*/
ret = 346480 - 1140 * val;
}
return sprintf(buf, "%d\n", ret);
}
static DEVICE_ATTR_RO(name);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5);
@ -124,6 +179,9 @@ static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12);
static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13);
static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14);
static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15);
static SENSOR_DEVICE_ATTR(in16_input, S_IRUGO, mc13783_adc_read_uid, NULL, 16);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
mc13783_adc_read_temp, NULL, 17);
static struct attribute *mc13783_attr_base[] = {
&dev_attr_name.attr,
@ -131,6 +189,8 @@ static struct attribute *mc13783_attr_base[] = {
&sensor_dev_attr_in5_input.dev_attr.attr,
&sensor_dev_attr_in6_input.dev_attr.attr,
&sensor_dev_attr_in7_input.dev_attr.attr,
&sensor_dev_attr_in16_input.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
NULL
};

15
drivers/mfd/mc13xxx-core.c
View file

@ -279,8 +279,21 @@ int mc13xxx_adc_do_conversion(struct mc13xxx *mc13xxx, unsigned int mode,
adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2;
adc1 = MC13XXX_ADC1_ADEN | MC13XXX_ADC1_ADTRIGIGN | MC13XXX_ADC1_ASC;
if (channel > 7)
/*
* Channels mapped through ADIN7:
* 7 - General purpose ADIN7
* 16 - UID
* 17 - Die temperature
*/
if (channel > 7 && channel < 16) {
adc1 |= MC13XXX_ADC1_ADSEL;
} else if (channel == 16) {
adc0 |= MC13XXX_ADC0_ADIN7SEL_UID;
channel = 7;
} else if (channel == 17) {
adc0 |= MC13XXX_ADC0_ADIN7SEL_DIE;
channel = 7;
}
switch (mode) {
case MC13XXX_ADC_MODE_TS:

2
include/linux/mfd/mc13xxx.h
View file

@ -243,6 +243,8 @@ struct mc13xxx_platform_data {
#define MC13XXX_ADC0_LICELLCON (1 << 0)
#define MC13XXX_ADC0_CHRGICON (1 << 1)
#define MC13XXX_ADC0_BATICON (1 << 2)
#define MC13XXX_ADC0_ADIN7SEL_DIE (1 << 4)
#define MC13XXX_ADC0_ADIN7SEL_UID (2 << 4)
#define MC13XXX_ADC0_ADREFEN (1 << 10)
#define MC13XXX_ADC0_TSMOD0 (1 << 12)
#define MC13XXX_ADC0_TSMOD1 (1 << 13)