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power: supply: olpc_battery: Add OLPC XO 1.75 support

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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>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Lubomir Rintel 2019-04-18 16:46:54 +02:00 committed by Sebastian Reichel
parent 8ecefda222
commit 76311b9a32
1 changed files with 19 additions and 6 deletions
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25
drivers/power/supply/olpc_battery.c
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@ -58,6 +58,7 @@ struct olpc_battery_data {
struct power_supply *olpc_bat;
char bat_serial[17];
bool new_proto;
bool little_endian;
};
/*********************************************************************
@ -323,6 +324,14 @@ static int olpc_bat_get_voltage_max_design(union power_supply_propval *val)
return ret;
}
static u16 ecword_to_cpu(struct olpc_battery_data *data, u16 ec_word)
{
if (data->little_endian)
return le16_to_cpu(ec_word);
else
return be16_to_cpu(ec_word);
}
/*********************************************************************
* Battery properties
*********************************************************************/
@ -395,7 +404,7 @@ 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:
@ -403,7 +412,7 @@ 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);
@ -434,21 +443,21 @@ 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);
@ -622,7 +631,11 @@ static int olpc_battery_probe(struct platform_device *pdev)
if (ret)
return ret;
if (ecver > 0x44) {
if (of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec")) {
/* XO 1.75 */
data->new_proto = true;
data->little_endian = true;
} else if (ecver > 0x44) {
/* XO 1 or 1.5 with a new EC firmware. */
data->new_proto = true;
} else if (ecver < 0x44) {