[PATCH] bq25890_charger.c : add the BQ25896 part

[Angus Ainslie <angus@akkea.ca>]

Add some debugging to be able to check the proper initialization
of the BQ25896 part.

Enable the BQ25896 part.

Add 2 new parameters "voltage_now" and "model_name".

Signed-off-by: Angus Ainslie <angus.ainslie@puri.sm>
---
 drivers/power/supply/bq25890_charger.c | 68 ++++++++++++++++++++++----
 1 file changed, 58 insertions(+), 10 deletions(-)

diff --git a/drivers/power/supply/bq25890_charger.c b/drivers/power/supply/bq25890_charger.c
index 8e2c41ded171..32cdae15ce40 100644
--- a/drivers/power/supply/bq25890_charger.c
+++ b/drivers/power/supply/bq25890_charger.c
@@ -32,6 +32,7 @@
 #define BQ25890_IRQ_PIN			"bq25890_irq"
 
 #define BQ25890_ID			3
+#define BQ25896_ID			0
 
 enum bq25890_fields {
 	F_EN_HIZ, F_EN_ILIM, F_IILIM,				     /* Reg00 */
@@ -153,8 +154,8 @@ static const struct reg_field bq25890_reg_fields[] = {
 	[F_CONV_RATE]		= REG_FIELD(0x02, 6, 6),
 	[F_BOOSTF]		= REG_FIELD(0x02, 5, 5),
 	[F_ICO_EN]		= REG_FIELD(0x02, 4, 4),
-	[F_HVDCP_EN]		= REG_FIELD(0x02, 3, 3),
-	[F_MAXC_EN]		= REG_FIELD(0x02, 2, 2),
+	[F_HVDCP_EN]		= REG_FIELD(0x02, 3, 3),  // reserved on BQ25896
+	[F_MAXC_EN]		= REG_FIELD(0x02, 2, 2),  // reserved on BQ25896
 	[F_FORCE_DPM]		= REG_FIELD(0x02, 1, 1),
 	[F_AUTO_DPDM_EN]	= REG_FIELD(0x02, 0, 0),
 	/* REG03 */
@@ -163,6 +164,7 @@ static const struct reg_field bq25890_reg_fields[] = {
 	[F_OTG_CFG]		= REG_FIELD(0x03, 5, 5),
 	[F_CHG_CFG]		= REG_FIELD(0x03, 4, 4),
 	[F_SYSVMIN]		= REG_FIELD(0x03, 1, 3),
+	/* MIN_VBAT_SEL on BQ25896 */
 	/* REG04 */
 	[F_PUMPX_EN]		= REG_FIELD(0x04, 7, 7),
 	[F_ICHG]		= REG_FIELD(0x04, 0, 6),
@@ -181,7 +183,7 @@ static const struct reg_field bq25890_reg_fields[] = {
 	[F_CHG_TMR]		= REG_FIELD(0x07, 1, 2),
 	[F_JEITA_ISET]		= REG_FIELD(0x07, 0, 0),
 	/* REG08 */
-	[F_BATCMP]		= REG_FIELD(0x08, 6, 7),
+	[F_BATCMP]		= REG_FIELD(0x08, 6, 7), // 5-7 on BQ25896
 	[F_VCLAMP]		= REG_FIELD(0x08, 2, 4),
 	[F_TREG]		= REG_FIELD(0x08, 0, 1),
 	/* REG09 */
@@ -195,12 +197,13 @@ static const struct reg_field bq25890_reg_fields[] = {
 	[F_PUMPX_DN]		= REG_FIELD(0x09, 0, 0),
 	/* REG0A */
 	[F_BOOSTV]		= REG_FIELD(0x0A, 4, 7),
+	/* PFM_OTG_DIS 3 on BQ25896 */
 	[F_BOOSTI]		= REG_FIELD(0x0A, 0, 2),
 	/* REG0B */
 	[F_VBUS_STAT]		= REG_FIELD(0x0B, 5, 7),
 	[F_CHG_STAT]		= REG_FIELD(0x0B, 3, 4),
 	[F_PG_STAT]		= REG_FIELD(0x0B, 2, 2),
-	[F_SDP_STAT]		= REG_FIELD(0x0B, 1, 1),
+	[F_SDP_STAT]		= REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
 	[F_VSYS_STAT]		= REG_FIELD(0x0B, 0, 0),
 	/* REG0C */
 	[F_WD_FAULT]		= REG_FIELD(0x0C, 7, 7),
@@ -401,6 +404,18 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
 		val->strval = BQ25890_MANUFACTURER;
 		break;
 
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		bq->chip_id = bq25890_field_read(bq, F_PN);
+
+		if (bq->chip_id == BQ25890_ID)
+			val->strval = "BQ25890";
+		else if (bq->chip_id == BQ25896_ID)
+			val->strval = "BQ25896";
+		else
+			val->strval = "UNKNOWN";
+
+		break;
+
 	case POWER_SUPPLY_PROP_ONLINE:
 		val->intval = state.online;
 		break;
@@ -453,6 +468,20 @@ static int bq25890_power_supply_get_property(struct power_supply *psy,
 		val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
 		break;
 
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		if (!state.online) {
+			val->intval = 0;
+			break;
+		}
+
+		ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
+		if (ret < 0)
+			return ret;
+
+		/* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
+		val->intval = 2304000 + ret * 20000;
+		break;
+
 	default:
 		return -EINVAL;
 	}
@@ -608,30 +637,43 @@ static int bq25890_hw_init(struct bq25890_device *bq)
 	};
 
 	ret = bq25890_chip_reset(bq);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "BQ259x reset failed %d\n", ret);
 		return ret;
+	}
 
 	/* disable watchdog */
 	ret = bq25890_field_write(bq, F_WD, 0);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "disabling watchdog failed %d\n", ret );
 		return ret;
+	}
 
 	/* 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)
+		if (ret < 0) {
+			dev_dbg(bq->dev, "writing init data failed %d\n",
+				ret);
 			return ret;
+		}
 	}
 
 	/* Configure ADC for continuous conversions. This does not enable it. */
 	ret = bq25890_field_write(bq, F_CONV_RATE, 1);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "Config ADC failed %d\n",
+			ret);
 		return ret;
+	}
 
 	ret = bq25890_get_chip_state(bq, &state);
-	if (ret < 0)
+	if (ret < 0) {
+		dev_dbg(bq->dev, "BQ2589x get state failed %d\n",
+			ret);
 		return ret;
+	}
 
 	mutex_lock(&bq->lock);
 	bq->state = state;
@@ -644,12 +686,14 @@ static enum power_supply_property bq25890_power_supply_props[] = {
 	POWER_SUPPLY_PROP_MANUFACTURER,
 	POWER_SUPPLY_PROP_STATUS,
 	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_MODEL_NAME,
 	POWER_SUPPLY_PROP_HEALTH,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 };
 
 static char *bq25890_charger_supplied_to[] = {
@@ -767,6 +811,9 @@ static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
 			if (props[i].optional)
 				continue;
 
+			printk( KERN_ERR "unable to read property %d %s\n", ret
+				, props[i].name );
+
 			return ret;
 		}
 
@@ -840,7 +887,7 @@ static int bq25890_probe(struct i2c_client *client,
 		return bq->chip_id;
 	}
 
-	if (bq->chip_id != BQ25890_ID) {
+	if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25896_ID)) {
 		dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
 		return -ENODEV;
 	}
@@ -966,6 +1013,7 @@ MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
 
 static const struct of_device_id bq25890_of_match[] = {
 	{ .compatible = "ti,bq25890", },
+	{ .compatible = "ti,bq25896", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, bq25890_of_match);
-- 
2.17.1