[PATCH 2/5] power: supply: cw2015: Add support for dual-cell configurations

[Chris Morgan <macroalpha82@gmail.com>]

From: Chris Morgan <macromorgan@hotmail.com>

The Cellwise cw2015 datasheet reports that it can handle two cells
in a series configuration. Allow a device tree parameter to note
this condition so that the driver reports the correct voltage values
to userspace.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 drivers/power/supply/cw2015_battery.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/power/supply/cw2015_battery.c b/drivers/power/supply/cw2015_battery.c
index f63c3c410451..b23a6d4fa4fa 100644
--- a/drivers/power/supply/cw2015_battery.c
+++ b/drivers/power/supply/cw2015_battery.c
@@ -77,6 +77,8 @@ struct cw_battery {
 	u32 poll_interval_ms;
 	u8 alert_level;
 
+	bool dual_cell;
+
 	unsigned int read_errors;
 	unsigned int charge_stuck_cnt;
 };
@@ -325,6 +327,9 @@ static int cw_get_voltage(struct cw_battery *cw_bat)
 	 */
 	voltage_mv = avg * 312 / 1024;
 
+	if (cw_bat->dual_cell)
+		voltage_mv *= 2;
+
 	dev_dbg(cw_bat->dev, "Read voltage: %d mV, raw=0x%04x\n",
 		voltage_mv, reg_val);
 	return voltage_mv;
@@ -587,6 +592,8 @@ static int cw2015_parse_properties(struct cw_battery *cw_bat)
 			return ret;
 	}
 
+	cw_bat->dual_cell = device_property_read_bool(dev, "cellwise,dual-cell");
+
 	ret = device_property_read_u32(dev, "cellwise,monitor-interval-ms",
 				       &cw_bat->poll_interval_ms);
 	if (ret) {
-- 
2.34.1