[PATCH 15/15] power: supply: olpc_battery: Add OLPC XO 1.75 support
From: lkundrak@v3.sk (Lubomir Rintel)
Date: 2018-10-10 17:24:01
Also in:
linux-devicetree, linux-pm, linux-spi, lkml, platform-driver-x86
Subsystem:
power supply class/subsystem and drivers, the rest · Maintainers:
Sebastian Reichel, Linus Torvalds
The battery and the protocol are essentially the same as OLPC XO 1.5, but the responses from the EC are LSB first. Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> --- drivers/power/supply/olpc_battery.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-)
diff --git a/drivers/power/supply/olpc_battery.c b/drivers/power/supply/olpc_battery.c
index dde9863e5c4a..2adf33b9f641 100644
--- a/drivers/power/supply/olpc_battery.c
+++ b/drivers/power/supply/olpc_battery.c@@ -56,6 +56,7 @@ struct olpc_battery_data { struct power_supply *olpc_bat; char bat_serial[17]; int new_proto; + int little_endian; }; /*********************************************************************
@@ -321,6 +322,14 @@ static int olpc_bat_get_voltage_max_design(union power_supply_propval *val) return ret; } +static s16 ecword_to_cpu(struct olpc_battery_data *data, u16 ec_byte) +{ + if (data->little_endian) + return le16_to_cpu(ec_byte); + else + return be16_to_cpu(ec_byte); +} + /********************************************************************* * Battery properties *********************************************************************/
@@ -393,7 +402,7 @@ static int olpc_bat_get_property(struct power_supply *psy, if (ret) return ret; - val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32; + val->intval = ecword_to_cpu(data, ec_word) * 9760L / 32; break; case POWER_SUPPLY_PROP_CURRENT_AVG: case POWER_SUPPLY_PROP_CURRENT_NOW:
@@ -401,7 +410,7 @@ static int olpc_bat_get_property(struct power_supply *psy, if (ret) return ret; - val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120; + val->intval = ecword_to_cpu(data, ec_word) * 15625L / 120; break; case POWER_SUPPLY_PROP_CAPACITY: ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
@@ -432,21 +441,21 @@ static int olpc_bat_get_property(struct power_supply *psy, if (ret) return ret; - val->intval = (s16)be16_to_cpu(ec_word) * 10 / 256; + val->intval = ecword_to_cpu(data, ec_word) * 10 / 256; break; case POWER_SUPPLY_PROP_TEMP_AMBIENT: ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); if (ret) return ret; - val->intval = (int)be16_to_cpu(ec_word) * 10 / 256; + val->intval = (int)ecword_to_cpu(data, ec_word) * 10 / 256; break; case POWER_SUPPLY_PROP_CHARGE_COUNTER: ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); if (ret) return ret; - val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15; + val->intval = ecword_to_cpu(data, ec_word) * 6250 / 15; break; case POWER_SUPPLY_PROP_SERIAL_NUMBER: ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8);
@@ -626,6 +635,10 @@ static int olpc_battery_probe(struct platform_device *pdev) if (ecver[0] > 0x44) { /* XO 1 or 1.5 with a new EC firmware. */ data->new_proto = 1; + } else if (of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec")) { + /* XO 1.75 */ + data->new_proto = 1; + data->little_endian = 1; } else if (ecver[0] < 0x44) { /* * We've seen a number of EC protocol changes; this driver
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2.19.0