[PATCH 1/7] power: supply: ab8500_btemp: convert to IIO ADC

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

This switches the AB8500 battery temperature driver to using
the standard IIO ADC channel lookup and conversion routines.

Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/power/supply/ab8500_btemp.c | 41 ++++++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 12 deletions(-)

diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
index 6ffdc18f2599..61161db5cffa 100644
--- a/drivers/power/supply/ab8500_btemp.c
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -26,7 +26,7 @@
 #include <linux/mfd/abx500.h>
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/mfd/abx500/ab8500-bm.h>
-#include <linux/mfd/abx500/ab8500-gpadc.h>
+#include <linux/iio/consumer.h>
 
 #define VTVOUT_V			1800
 
@@ -79,7 +79,8 @@ struct ab8500_btemp_ranges {
  * @bat_temp:		Dispatched battery temperature in degree Celcius
  * @prev_bat_temp	Last measured battery temperature in degree Celcius
  * @parent:		Pointer to the struct ab8500
- * @gpadc:		Pointer to the struct gpadc
+ * @adc_btemp_ball:	ADC channel for the battery ball temperature
+ * @adc_bat_ctrl:	ADC channel for the battery control
  * @fg:			Pointer to the struct fg
  * @bm:           	Platform specific battery management information
  * @btemp_psy:		Structure for BTEMP specific battery properties
@@ -96,7 +97,8 @@ struct ab8500_btemp {
 	int bat_temp;
 	int prev_bat_temp;
 	struct ab8500 *parent;
-	struct ab8500_gpadc *gpadc;
+	struct iio_channel *btemp_ball;
+	struct iio_channel *bat_ctrl;
 	struct ab8500_fg *fg;
 	struct abx500_bm_data *bm;
 	struct power_supply *btemp_psy;
@@ -180,13 +182,13 @@ static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
  */
 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
 {
-	int vbtemp;
+	int vbtemp, ret;
 	static int prev;
 
-	vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
-	if (vbtemp < 0) {
+	ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp);
+	if (ret < 0) {
 		dev_err(di->dev,
-			"%s gpadc conversion failed, using previous value",
+			"%s ADC conversion failed, using previous value",
 			__func__);
 		return prev;
 	}
@@ -501,7 +503,7 @@ static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
  */
 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
 {
-	int temp;
+	int temp, ret;
 	static int prev;
 	int rbat, rntc, vntc;
 	u8 id;
@@ -526,10 +528,10 @@ static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
 			di->bm->bat_type[id].r_to_t_tbl,
 			di->bm->bat_type[id].n_temp_tbl_elements, rbat);
 	} else {
-		vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
-		if (vntc < 0) {
+		ret = iio_read_channel_processed(di->btemp_ball, &vntc);
+		if (ret < 0) {
 			dev_err(di->dev,
-				"%s gpadc conversion failed,"
+				"%s ADC conversion failed,"
 				" using previous value\n", __func__);
 			return prev;
 		}
@@ -1085,7 +1087,22 @@ static int ab8500_btemp_probe(struct platform_device *pdev)
 	/* get parent data */
 	di->dev = &pdev->dev;
 	di->parent = dev_get_drvdata(pdev->dev.parent);
-	di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
+
+	/* Get ADC channels */
+	di->btemp_ball = devm_iio_channel_get(&pdev->dev, "btemp_ball");
+	if (IS_ERR(di->btemp_ball)) {
+		if (PTR_ERR(di->btemp_ball) == -ENODEV)
+                        return -EPROBE_DEFER;
+		dev_err(&pdev->dev, "failed to get BTEMP BALL ADC channel\n");
+		return PTR_ERR(di->btemp_ball);
+	}
+	di->bat_ctrl = devm_iio_channel_get(&pdev->dev, "bat_ctrl");
+	if (IS_ERR(di->bat_ctrl)) {
+		if (PTR_ERR(di->bat_ctrl) == -ENODEV)
+                        return -EPROBE_DEFER;
+		dev_err(&pdev->dev, "failed to get BAT CTRL ADC channel\n");
+		return PTR_ERR(di->bat_ctrl);
+	}
 
 	di->initialized = false;
 
-- 
2.9.3

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