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| author | Fabrice Gasnier <fabrice.gasnier@st.com> | 2018-11-12 14:03:58 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-11-20 12:35:25 -0500 |
| commit | 63f004e7aae17a6b6048c88ce7e39d64e58c08c1 (patch) | |
| tree | d24d457dd1dfedb302da045a978782508556dcc1 /drivers/adc | |
| parent | d73d81fd85e4a030ade42c4b2d13466d45090aa3 (diff) | |
| download | u-boot-63f004e7aae17a6b6048c88ce7e39d64e58c08c1.tar.gz u-boot-63f004e7aae17a6b6048c88ce7e39d64e58c08c1.tar.bz2 u-boot-63f004e7aae17a6b6048c88ce7e39d64e58c08c1.zip | |
dm: adc: add uclass's mask and conversion helpers
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.gasnier@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/adc')
| -rw-r--r-- | drivers/adc/adc-uclass.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/adc/adc-uclass.c b/drivers/adc/adc-uclass.c index 738c1eabdc..0a492eba54 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); |