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authorDragos Bogdan <dragos.bogdan@analog.com>2017-07-16 11:35:32 +0200
committerSebastian Reichel <sre@kernel.org>2017-07-25 12:13:04 +0200
commit17825ff6ec6db23892e61a1496abf7d737afe9e7 (patch)
tree1375d8f7554535ffe393ab26c371de04abfb926c /drivers/power
parenta65df832f96588debbbdd93d392a4ff77d5d237c (diff)
downloadlinux-17825ff6ec6db23892e61a1496abf7d737afe9e7.tar.bz2
power: supply: ltc2941-battery-gauge: Add LTC2944 support
LTC2944 is compatible with LTC2943, but uses different voltage and current computing constants. Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com> Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Tested-by: Dragos Bogdan <dragos.bogdan@analog.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/supply/ltc2941-battery-gauge.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c
index 42ff4e3daf35..08e4fd9ee607 100644
--- a/drivers/power/supply/ltc2941-battery-gauge.c
+++ b/drivers/power/supply/ltc2941-battery-gauge.c
@@ -1,6 +1,6 @@
/*
- * I2C client/driver for the Linear Technology LTC2941, LTC2942 and LTC2943
- * Battery Gas Gauge IC
+ * I2C client/driver for the Linear Technology LTC2941, LTC2942, LTC2943
+ * and LTC2944 Battery Gas Gauge IC
*
* Copyright (C) 2014 Topic Embedded Systems
*
@@ -48,6 +48,7 @@ enum ltc294x_id {
LTC2941_ID,
LTC2942_ID,
LTC2943_ID,
+ LTC2944_ID,
};
#define LTC2941_REG_STATUS_CHIP_ID BIT(7)
@@ -153,7 +154,8 @@ static int ltc294x_reset(const struct ltc294x_info *info, int prescaler_exp)
case LTC2942_ID: /* 2942 measures every 2 sec */
control |= LTC2942_REG_CONTROL_MODE_SCAN;
break;
- case LTC2943_ID: /* 2943 measures every 10 sec */
+ case LTC2943_ID:
+ case LTC2944_ID: /* 2943 and 2944 measure every 10 sec */
control |= LTC2943_REG_CONTROL_MODE_SCAN;
break;
default:
@@ -269,6 +271,11 @@ static int ltc294x_get_voltage(const struct ltc294x_info *info, int *val)
value /= 0xFFFF;
value *= 1000 / 2;
break;
+ case LTC2944_ID:
+ value *= 70800 / 5*4;
+ value /= 0xFFFF;
+ value *= 1000 * 5/4;
+ break;
default:
value *= 6000 * 10;
value /= 0xFFFF;
@@ -289,10 +296,14 @@ static int ltc294x_get_current(const struct ltc294x_info *info, int *val)
LTC2943_REG_CURRENT_MSB, &datar[0], 2);
value = (datar[0] << 8) | datar[1];
value -= 0x7FFF;
+ if (info->id == LTC2944_ID)
+ value *= 64000;
+ else
+ value *= 60000;
/* Value is in range -32k..+32k, r_sense is usually 10..50 mOhm,
* the formula below keeps everything in s32 range while preserving
* enough digits */
- *val = 1000 * ((60000 * value) / (info->r_sense * 0x7FFF)); /* in uA */
+ *val = 1000 * (value / (info->r_sense * 0x7FFF)); /* in uA */
return ret;
}
@@ -470,6 +481,7 @@ static int ltc294x_i2c_probe(struct i2c_client *client,
info->supply_desc.type = POWER_SUPPLY_TYPE_BATTERY;
info->supply_desc.properties = ltc294x_properties;
switch (info->id) {
+ case LTC2944_ID:
case LTC2943_ID:
info->supply_desc.num_properties =
ARRAY_SIZE(ltc294x_properties);
@@ -543,6 +555,7 @@ static const struct i2c_device_id ltc294x_i2c_id[] = {
{ "ltc2941", LTC2941_ID, },
{ "ltc2942", LTC2942_ID, },
{ "ltc2943", LTC2943_ID, },
+ { "ltc2944", LTC2944_ID, },
{ },
};
MODULE_DEVICE_TABLE(i2c, ltc294x_i2c_id);
@@ -560,6 +573,10 @@ static const struct of_device_id ltc294x_i2c_of_match[] = {
.compatible = "lltc,ltc2943",
.data = (void *)LTC2943_ID,
},
+ {
+ .compatible = "lltc,ltc2944",
+ .data = (void *)LTC2944_ID,
+ },
{ },
};
MODULE_DEVICE_TABLE(of, ltc294x_i2c_of_match);
@@ -578,5 +595,5 @@ module_i2c_driver(ltc294x_driver);
MODULE_AUTHOR("Auryn Verwegen, Topic Embedded Systems");
MODULE_AUTHOR("Mike Looijmans, Topic Embedded Products");
-MODULE_DESCRIPTION("LTC2941/LTC2942/LTC2943 Battery Gas Gauge IC driver");
+MODULE_DESCRIPTION("LTC2941/LTC2942/LTC2943/LTC2944 Battery Gas Gauge IC driver");
MODULE_LICENSE("GPL");