[PATCH v4 04/20] power: supply: bq25890: Add a bq25890_rw_init_data() helper

[Hans de Goede <hdegoede@redhat.com>]

On most x86/ACPI devices there is no devicetree to supply the necessary
init-data. Instead the firmware already fully initializes the bq25890
charger at boot.

Factor out the current code to write all the init_data from devicetree
into a new bq25890_rw_init_data() helper which can both write the data
to the charger (the current behavior) as well as read it back from
the charger into the init_data struct.

This is a preparation patch for adding support for x86/ACPI device's
where the init_data must be read back from the bq25890 charger.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/power/supply/bq25890_charger.c | 62 +++++++++++++++++---------
 1 file changed, 40 insertions(+), 22 deletions(-)

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 7a3269c06b38..eaf0400b632f 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -693,29 +693,52 @@ static int bq25890_chip_reset(struct bq25890_device *bq)
 	return 0;
 }
 
-static int bq25890_hw_init(struct bq25890_device *bq)
+static int bq25890_rw_init_data(struct bq25890_device *bq)
 {
+	bool write = true;
 	int ret;
 	int i;
 
 	const struct {
 		enum bq25890_fields id;
-		u32 value;
+		u8 *value;
 	} init_data[] = {
-		{F_ICHG,	 bq->init_data.ichg},
-		{F_VREG,	 bq->init_data.vreg},
-		{F_ITERM,	 bq->init_data.iterm},
-		{F_IPRECHG,	 bq->init_data.iprechg},
-		{F_SYSVMIN,	 bq->init_data.sysvmin},
-		{F_BOOSTV,	 bq->init_data.boostv},
-		{F_BOOSTI,	 bq->init_data.boosti},
-		{F_BOOSTF,	 bq->init_data.boostf},
-		{F_EN_ILIM,	 bq->init_data.ilim_en},
-		{F_TREG,	 bq->init_data.treg},
-		{F_BATCMP,	 bq->init_data.rbatcomp},
-		{F_VCLAMP,	 bq->init_data.vclamp},
+		{F_ICHG,	 &bq->init_data.ichg},
+		{F_VREG,	 &bq->init_data.vreg},
+		{F_ITERM,	 &bq->init_data.iterm},
+		{F_IPRECHG,	 &bq->init_data.iprechg},
+		{F_SYSVMIN,	 &bq->init_data.sysvmin},
+		{F_BOOSTV,	 &bq->init_data.boostv},
+		{F_BOOSTI,	 &bq->init_data.boosti},
+		{F_BOOSTF,	 &bq->init_data.boostf},
+		{F_EN_ILIM,	 &bq->init_data.ilim_en},
+		{F_TREG,	 &bq->init_data.treg},
+		{F_BATCMP,	 &bq->init_data.rbatcomp},
+		{F_VCLAMP,	 &bq->init_data.vclamp},
 	};
 
+	for (i = 0; i < ARRAY_SIZE(init_data); i++) {
+		if (write) {
+			ret = bq25890_field_write(bq, init_data[i].id,
+						  *init_data[i].value);
+		} else {
+			ret = bq25890_field_read(bq, init_data[i].id);
+			if (ret >= 0)
+				*init_data[i].value = ret;
+		}
+		if (ret < 0) {
+			dev_dbg(bq->dev, "Accessing init data failed %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int bq25890_hw_init(struct bq25890_device *bq)
+{
+	int ret;
+
 	ret = bq25890_chip_reset(bq);
 	if (ret < 0) {
 		dev_dbg(bq->dev, "Reset failed %d\n", ret);
@@ -730,14 +753,9 @@ static int bq25890_hw_init(struct bq25890_device *bq)
 	}
 
 	/* initialize currents/voltages and other parameters */
-	for (i = 0; i < ARRAY_SIZE(init_data); i++) {
-		ret = bq25890_field_write(bq, init_data[i].id,
-					  init_data[i].value);
-		if (ret < 0) {
-			dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
-			return ret;
-		}
-	}
+	ret = bq25890_rw_init_data(bq);
+	if (ret)
+		return ret;
 
 	ret = bq25890_get_chip_state(bq, &bq->state);
 	if (ret < 0) {
-- 
2.33.1