[PATCH v2] hwmon: MC13783: add uid and die temperature sensor inputs

From: Andrey Gusakov
Date: Tue Mar 20 2018 - 10:59:53 EST


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

Signed-off-by: Andrey Gusakov <andrey.gusakov@xxxxxxxxxxxxxxxxxx>
---
Changes in v2:
- suport both mc13783 and mc13892
- uit_input renamed to in16_input
- style fixes
---
drivers/hwmon/mc13783-adc.c | 57 +++++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/mc13xxx-core.c | 15 +++++++++++-
include/linux/mfd/mc13xxx.h | 2 ++
3 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/mc13783-adc.c b/drivers/hwmon/mc13783-adc.c
index 960a1db..413b83c 100644
--- a/drivers/hwmon/mc13783-adc.c
+++ b/drivers/hwmon/mc13783-adc.c
@@ -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 +115,54 @@ 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;
+
+ /* MC13892 have 1/2 divider, input range is [0, 4.800V] */
+ if (driver_data & MC13783_ADC_BPDIV2)
+ val = DIV_ROUND_CLOSEST(val * 4800, 1024);
+ /* MC13783 have 0.9 divider, input range is [0, 2.555V] */
+ else
+ 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;
+
+ /* MC13892:
+ * Die Temperature Read Out Code at 25C 680
+ * Temperature change per LSB +0.4244C
+ */
+ if (driver_data & MC13783_ADC_BPDIV2)
+ ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);
+ /* MC13783:
+ * Die Temperature Read Out Code at 25C 282
+ * Temperature change per LSB -1.14C
+ */
+ else
+ 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 +176,9 @@ static ssize_t mc13783_adc_read_gp(struct device *dev,
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 +186,8 @@ static ssize_t mc13783_adc_read_gp(struct device *dev,
&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
};

diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
index d7f54e4..c63e331 100644
--- a/drivers/mfd/mc13xxx-core.c
+++ b/drivers/mfd/mc13xxx-core.c
@@ -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:
diff --git a/include/linux/mfd/mc13xxx.h b/include/linux/mfd/mc13xxx.h
index 638222e..54a3cd8 100644
--- a/include/linux/mfd/mc13xxx.h
+++ b/include/linux/mfd/mc13xxx.h
@@ -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)
--
1.9.1