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iio: health/afe440x: Make gain settings a modifier for the stages 

Currently the TIA gain settings are exported to userspace as sysfs
entries that do not clearly represent their internal relation to the
sampling stages. The gain settings are enabled on a per-stage basis,
this can be seen in figure 24 of the current AFE4404 datasheet.
These gain settings should therefore be tied to the channels that are
read during these stages. Make this change here.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Andrew F. Davis 2016-05-01 15:37:00 -05:00 committed by Jonathan Cameron
parent b36e825764
commit 1276187c52
3 changed files with 53 additions and 34 deletions
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19
Documentation/ABI/testing/sysfs-bus-iio-health-afe440x
View File

@ -1,13 +1,3 @@
What: /sys/bus/iio/devices/iio:deviceX/tia_resistanceY
/sys/bus/iio/devices/iio:deviceX/tia_capacitanceY
Date: December 2015
KernelVersion:
Contact: Andrew F. Davis <afd@ti.com>
Description:
Get and set the resistance and the capacitance settings for the
Transimpedance Amplifier. Y is 1 for Rf1 and Cf1, Y is 2 for
Rf2 and Cf2 values.
What: /sys/bus/iio/devices/iio:deviceX/in_intensityY_raw
Date: May 2016
KernelVersion:
@ -33,6 +23,15 @@ Description:
Get and set the offset cancellation DAC setting for these
stages. The values are expressed in 5-bit sign-magnitude.
What: /sys/bus/iio/devices/iio:deviceX/in_intensityY_resistance
What: /sys/bus/iio/devices/iio:deviceX/in_intensityY_capacitance
Date: May 2016
KernelVersion:
Contact: Andrew F. Davis <afd@ti.com>
Description:
Get and set the resistance and the capacitance settings for the
Transimpedance Amplifier during the associated stage.
What: /sys/bus/iio/devices/iio:deviceX/out_currentY_raw
Date: May 2016
KernelVersion:

34
drivers/iio/health/afe4403.c
View File

@ -161,7 +161,7 @@ static const struct afe440x_val_table afe4403_res_table[] = {
{ 500000 }, { 250000 }, { 100000 }, { 50000 },
{ 25000 }, { 10000 }, { 1000000 }, { 0 },
};
AFE440X_TABLE_ATTR(tia_resistance_available, afe4403_res_table);
AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4403_res_table);
static const struct afe440x_val_table afe4403_cap_table[] = {
{ 0, 5000 }, { 0, 10000 }, { 0, 20000 }, { 0, 25000 },
@ -173,7 +173,7 @@ static const struct afe440x_val_table afe4403_cap_table[] = {
{ 0, 205000 }, { 0, 210000 }, { 0, 220000 }, { 0, 225000 },
{ 0, 230000 }, { 0, 235000 }, { 0, 245000 }, { 0, 250000 },
};
AFE440X_TABLE_ATTR(tia_capacitance_available, afe4403_cap_table);
AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4403_cap_table);
static ssize_t afe440x_show_register(struct device *dev,
struct device_attribute *attr,
@ -226,19 +226,29 @@ static ssize_t afe440x_store_register(struct device *dev,
return count;
}
static AFE440X_ATTR(tia_resistance1, F_RF_LED1, afe4403_res_table);
static AFE440X_ATTR(tia_capacitance1, F_CF_LED1, afe4403_cap_table);
static AFE440X_ATTR(in_intensity1_resistance, F_RF_LED, afe4403_res_table);
static AFE440X_ATTR(in_intensity1_capacitance, F_CF_LED, afe4403_cap_table);
static AFE440X_ATTR(tia_resistance2, F_RF_LED, afe4403_res_table);
static AFE440X_ATTR(tia_capacitance2, F_CF_LED, afe4403_cap_table);
static AFE440X_ATTR(in_intensity2_resistance, F_RF_LED, afe4403_res_table);
static AFE440X_ATTR(in_intensity2_capacitance, F_CF_LED, afe4403_cap_table);
static AFE440X_ATTR(in_intensity3_resistance, F_RF_LED1, afe4403_res_table);
static AFE440X_ATTR(in_intensity3_capacitance, F_CF_LED1, afe4403_cap_table);
static AFE440X_ATTR(in_intensity4_resistance, F_RF_LED1, afe4403_res_table);
static AFE440X_ATTR(in_intensity4_capacitance, F_CF_LED1, afe4403_cap_table);
static struct attribute *afe440x_attributes[] = {
&afe440x_attr_tia_resistance1.dev_attr.attr,
&afe440x_attr_tia_capacitance1.dev_attr.attr,
&afe440x_attr_tia_resistance2.dev_attr.attr,
&afe440x_attr_tia_capacitance2.dev_attr.attr,
&dev_attr_tia_resistance_available.attr,
&dev_attr_tia_capacitance_available.attr,
&dev_attr_in_intensity_resistance_available.attr,
&dev_attr_in_intensity_capacitance_available.attr,
&afe440x_attr_in_intensity1_resistance.dev_attr.attr,
&afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
&afe440x_attr_in_intensity2_resistance.dev_attr.attr,
&afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
&afe440x_attr_in_intensity3_resistance.dev_attr.attr,
&afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
&afe440x_attr_in_intensity4_resistance.dev_attr.attr,
&afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
NULL
};

34
drivers/iio/health/afe4404.c
View File

@ -179,7 +179,7 @@ static const struct afe440x_val_table afe4404_res_table[] = {
{ .integer = 1000000, .fract = 0 },
{ .integer = 2000000, .fract = 0 },
};
AFE440X_TABLE_ATTR(tia_resistance_available, afe4404_res_table);
AFE440X_TABLE_ATTR(in_intensity_resistance_available, afe4404_res_table);
static const struct afe440x_val_table afe4404_cap_table[] = {
{ .integer = 0, .fract = 5000 },
@ -191,7 +191,7 @@ static const struct afe440x_val_table afe4404_cap_table[] = {
{ .integer = 0, .fract = 25000 },
{ .integer = 0, .fract = 22500 },
};
AFE440X_TABLE_ATTR(tia_capacitance_available, afe4404_cap_table);
AFE440X_TABLE_ATTR(in_intensity_capacitance_available, afe4404_cap_table);
static ssize_t afe440x_show_register(struct device *dev,
struct device_attribute *attr,
@ -244,19 +244,29 @@ static ssize_t afe440x_store_register(struct device *dev,
return count;
}
static AFE440X_ATTR(tia_resistance1, F_TIA_GAIN, afe4404_res_table);
static AFE440X_ATTR(tia_capacitance1, TIA_CF, afe4404_cap_table);
static AFE440X_ATTR(in_intensity1_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
static AFE440X_ATTR(in_intensity1_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
static AFE440X_ATTR(tia_resistance2, F_TIA_GAIN_SEP, afe4404_res_table);
static AFE440X_ATTR(tia_capacitance2, F_TIA_CF_SEP, afe4404_cap_table);
static AFE440X_ATTR(in_intensity2_resistance, F_TIA_GAIN_SEP, afe4404_res_table);
static AFE440X_ATTR(in_intensity2_capacitance, F_TIA_CF_SEP, afe4404_cap_table);
static AFE440X_ATTR(in_intensity3_resistance, F_TIA_GAIN, afe4404_res_table);
static AFE440X_ATTR(in_intensity3_capacitance, TIA_CF, afe4404_cap_table);
static AFE440X_ATTR(in_intensity4_resistance, F_TIA_GAIN, afe4404_res_table);
static AFE440X_ATTR(in_intensity4_capacitance, TIA_CF, afe4404_cap_table);
static struct attribute *afe440x_attributes[] = {
&afe440x_attr_tia_resistance1.dev_attr.attr,
&afe440x_attr_tia_capacitance1.dev_attr.attr,
&afe440x_attr_tia_resistance2.dev_attr.attr,
&afe440x_attr_tia_capacitance2.dev_attr.attr,
&dev_attr_tia_resistance_available.attr,
&dev_attr_tia_capacitance_available.attr,
&dev_attr_in_intensity_resistance_available.attr,
&dev_attr_in_intensity_capacitance_available.attr,
&afe440x_attr_in_intensity1_resistance.dev_attr.attr,
&afe440x_attr_in_intensity1_capacitance.dev_attr.attr,
&afe440x_attr_in_intensity2_resistance.dev_attr.attr,
&afe440x_attr_in_intensity2_capacitance.dev_attr.attr,
&afe440x_attr_in_intensity3_resistance.dev_attr.attr,
&afe440x_attr_in_intensity3_capacitance.dev_attr.attr,
&afe440x_attr_in_intensity4_resistance.dev_attr.attr,
&afe440x_attr_in_intensity4_capacitance.dev_attr.attr,
NULL
};