Add two functions to ADC uclass's:
- adc_raw_to_uV() to ease ADC raw value conversion to microvolts
- adc_channel_mask() to get channels on consumer side
Signed-off-by: Fabrice Gasnier <fabrice.gasn...@st.com>
---
drivers/adc/adc-uclass.c | 37 +++++++++++++++++++++++++++++++++++++
include/adc.h | 21 +++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/drivers/adc/adc-uclass.c b/drivers/adc/adc-uclass.c
index 738c1ea..0a492eb 100644
--- a/drivers/adc/adc-uclass.c
+++ b/drivers/adc/adc-uclass.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <errno.h>
+#include <div64.h>
#include <dm.h>
#include <dm/lists.h>
#include <dm/device-internal.h>
@@ -77,6 +78,18 @@ int adc_data_mask(struct udevice *dev, unsigned int
*data_mask)
return 0;
}
+int adc_channel_mask(struct udevice *dev, unsigned int *channel_mask)
+{
+ struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
+
+ if (!uc_pdata)
+ return -ENOSYS;
+
+ *channel_mask = uc_pdata->channel_mask;
+
+ return 0;
+}
+
int adc_stop(struct udevice *dev)
{
const struct adc_ops *ops = dev_get_driver_ops(dev);
@@ -329,6 +342,30 @@ int adc_vss_value(struct udevice *dev, int *uV)
return 0;
}
+int adc_raw_to_uV(struct udevice *dev, unsigned int raw, int *uV)
+{
+ unsigned int data_mask;
+ int ret, val, vref;
+ u64 raw64 = raw;
+
+ ret = adc_vdd_value(dev, &vref);
+ if (ret)
+ return ret;
+
+ if (!adc_vss_value(dev, &val))
+ vref -= val;
+
+ ret = adc_data_mask(dev, &data_mask);
+ if (ret)
+ return ret;
+
+ raw64 *= vref;
+ do_div(raw64, data_mask);
+ *uV = raw64;
+
+ return 0;
+}
+
static int adc_vdd_platdata_set(struct udevice *dev)
{
struct adc_uclass_platdata *uc_pdata = dev_get_uclass_platdata(dev);
diff --git a/include/adc.h b/include/adc.h
index d04c9c4..5841dfb 100644
--- a/include/adc.h
+++ b/include/adc.h
@@ -219,6 +219,17 @@ int adc_channels_data(struct udevice *dev, unsigned int
channel_mask,
int adc_data_mask(struct udevice *dev, unsigned int *data_mask);
/**
+ * adc_channel_mask() - get channel mask for given ADC device
+ *
+ * This can be used if adc uclass platform data is filled.
+ *
+ * @dev: ADC device to check
+ * @channel_mask: pointer to the returned channel bitmask
+ * @return: 0 if OK, -ve on error
+ */
+int adc_channel_mask(struct udevice *dev, unsigned int *channel_mask);
+
+/**
* adc_channel_single_shot() - get output data of conversion for the ADC
* device's channel. This function searches for the device with the given name,
* starts the given channel conversion and returns the output data.
@@ -284,4 +295,14 @@ int adc_vss_value(struct udevice *dev, int *uV);
*/
int adc_stop(struct udevice *dev);
+/**
+ * adc_raw_to_uV() - converts raw value to microvolts for given ADC device.
+ *
+ * @dev: ADC device used from conversion
+ * @raw: raw value to convert
+ * @uV: converted value in microvolts
+ * @return: 0 on success or -ve on error
+ */
+int adc_raw_to_uV(struct udevice *dev, unsigned int raw, int *uV);
+
#endif
--
1.9.1
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