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authorCixi Geng <cixi.geng1@unisoc.com>2022-04-19 17:24:56 +0300
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2022-04-28 21:22:56 +0300
commitaac053d03eecb3141268e360696f90e68d78e8ad (patch)
tree27523c416724dce41b40fff56301c581fa8c75bc /drivers/iio
parente4171388a431d43048f8b1ca1734645b4e1a8a4d (diff)
downloadlinux-aac053d03eecb3141268e360696f90e68d78e8ad.tar.xz
iio: adc: sc27xx: refactor some functions for support more PMiCs
Refactor the common adc_nvmem_cell_calib_data,adc_to_volt and call these in the origin sc27xx_adc_scale_calibration,sc27xx_adc_to_volt Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com> Link: https://lore.kernel.org/r/20220419142458.884933-6-gengcixi@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/adc/sc27xx_adc.c56
1 files changed, 40 insertions, 16 deletions
diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
index 0409c4515ad3..1d0239061994 100644
--- a/drivers/iio/adc/sc27xx_adc.c
+++ b/drivers/iio/adc/sc27xx_adc.c
@@ -135,16 +135,41 @@ static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
return ((calib_data & 0xff) + calib_adc - 128) * 4;
}
+/* get the adc nvmem cell calibration data */
+static int adc_nvmem_cell_calib_data(struct sc27xx_adc_data *data, const char *cell_name)
+{
+ struct nvmem_cell *cell;
+ void *buf;
+ u32 origin_calib_data = 0;
+ size_t len;
+
+ if (!data)
+ return -EINVAL;
+
+ cell = nvmem_cell_get(data->dev, cell_name);
+ if (IS_ERR(cell))
+ return PTR_ERR(cell);
+
+ buf = nvmem_cell_read(cell, &len);
+ if (IS_ERR(buf)) {
+ nvmem_cell_put(cell);
+ return PTR_ERR(buf);
+ }
+
+ memcpy(&origin_calib_data, buf, min(len, sizeof(u32)));
+
+ kfree(buf);
+ nvmem_cell_put(cell);
+ return origin_calib_data;
+}
+
static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
bool big_scale)
{
const struct sc27xx_adc_linear_graph *calib_graph;
struct sc27xx_adc_linear_graph *graph;
- struct nvmem_cell *cell;
const char *cell_name;
u32 calib_data = 0;
- void *buf;
- size_t len;
if (big_scale) {
calib_graph = data->var_data->bscale_cal;
@@ -156,24 +181,13 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
cell_name = "small_scale_calib";
}
- cell = nvmem_cell_get(data->dev, cell_name);
- if (IS_ERR(cell))
- return PTR_ERR(cell);
-
- buf = nvmem_cell_read(cell, &len);
- nvmem_cell_put(cell);
-
- if (IS_ERR(buf))
- return PTR_ERR(buf);
-
- memcpy(&calib_data, buf, min(len, sizeof(u32)));
+ calib_data = adc_nvmem_cell_calib_data(data, cell_name);
/* Only need to calibrate the adc values in the linear graph. */
graph->adc0 = sc27xx_adc_get_calib_data(calib_data, calib_graph->adc0);
graph->adc1 = sc27xx_adc_get_calib_data(calib_data >> 8,
calib_graph->adc1);
- kfree(buf);
return 0;
}
@@ -309,7 +323,7 @@ static void sc27xx_adc_volt_ratio(struct sc27xx_adc_data *data,
*div_denominator = ratio & SC27XX_RATIO_DENOMINATOR_MASK;
}
-static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
+static int adc_to_volt(struct sc27xx_adc_linear_graph *graph,
int raw_adc)
{
int tmp;
@@ -318,6 +332,16 @@ static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
tmp /= (graph->adc0 - graph->adc1);
tmp += graph->volt1;
+ return tmp;
+}
+
+static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
+ int raw_adc)
+{
+ int tmp;
+
+ tmp = adc_to_volt(graph, raw_adc);
+
return tmp < 0 ? 0 : tmp;
}