linux-kernel - [PATCH V4 5/7] iio: adc: refactor some functions for support more PMiCs

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Date:   Tue, 19 Apr 2022 22:24:56 +0800
From:   Cixi Geng <gengcixi@...il.com>
To:     jic23@...nel.org, lars@...afoo.de, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, orsonzhai@...il.com,
        baolin.wang7@...il.com, zhang.lyra@...il.com,
        yuming.zhu1@...soc.com
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH V4 5/7] iio: adc: refactor some functions for support more PMiCs

From: Cixi Geng <cixi.geng1@...soc.com>

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@...soc.com>
---
 drivers/iio/adc/sc27xx_adc.c | 56 +++++++++++++++++++++++++-----------
 1 file changed, 40 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
index a8906ffd85bf..27fab579a281 100644
--- a/drivers/iio/adc/sc27xx_adc.c
+++ b/drivers/iio/adc/sc27xx_adc.c
@@ -138,16 +138,41 @@ 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;
@@ -159,24 +184,13 @@ 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;
 }
 
@@ -312,7 +326,7 @@ 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;
@@ -321,6 +335,16 @@ 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;
 }
 
-- 
2.25.1