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authorAndreas Dannenberg <dannenberg@ti.com>2015-09-28 17:33:58 -0500
committerSebastian Reichel <sre@kernel.org>2015-09-29 16:54:44 +0200
commit138606ffe45511fa774e51df04f6da562ff9c44d (patch)
treed52b1c29b704420d3da7fed941b8e3d47937d071
parentbb2956e8e1976d876a755896f5be287cb7e766b2 (diff)
downloadblackbird-op-linux-138606ffe45511fa774e51df04f6da562ff9c44d.tar.gz
blackbird-op-linux-138606ffe45511fa774e51df04f6da562ff9c44d.zip
power: bq24257: Add input DPM voltage threshold setting support
A new optional device property called "ti,in-dpm-voltage" is introduced to allow configuring the input voltage threshold for the devices' dynamic power path management (DPM) feature. In short, it can be used to prevent the input voltage from dropping below a certain value as current is drawn to charge the battery or supply the system. Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Reviewed-by: Laurentiu Palcu <laurentiu.palcu@intel.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
-rw-r--r--drivers/power/bq24257_charger.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/power/bq24257_charger.c b/drivers/power/bq24257_charger.c
index b617c3a20652..ebb22f3be487 100644
--- a/drivers/power/bq24257_charger.c
+++ b/drivers/power/bq24257_charger.c
@@ -79,6 +79,7 @@ struct bq24257_init_data {
u8 iterm; /* termination current */
u8 iilimit; /* input current limit */
u8 vovp; /* over voltage protection voltage */
+ u8 vindpm; /* VDMP input threshold voltage */
};
struct bq24257_state {
@@ -208,6 +209,13 @@ static const u32 bq24257_vovp_map[] = {
#define BQ24257_VOVP_MAP_SIZE ARRAY_SIZE(bq24257_vovp_map)
+static const u32 bq24257_vindpm_map[] = {
+ 4200000, 4280000, 4360000, 4440000, 4520000, 4600000, 4680000,
+ 4760000
+};
+
+#define BQ24257_VINDPM_MAP_SIZE ARRAY_SIZE(bq24257_vindpm_map)
+
static int bq24257_field_read(struct bq24257_device *bq,
enum bq24257_fields field_id)
{
@@ -434,6 +442,17 @@ enum bq24257_vovp {
VOVP_10500
};
+enum bq24257_vindpm {
+ VINDPM_4200,
+ VINDPM_4280,
+ VINDPM_4360,
+ VINDPM_4440,
+ VINDPM_4520,
+ VINDPM_4600,
+ VINDPM_4680,
+ VINDPM_4760
+};
+
enum bq24257_port_type {
PORT_TYPE_DCP, /* Dedicated Charging Port */
PORT_TYPE_CDP, /* Charging Downstream Port */
@@ -607,6 +626,7 @@ static int bq24257_hw_init(struct bq24257_device *bq)
{F_VBAT, bq->init_data.vbat},
{F_ITERM, bq->init_data.iterm},
{F_VOVP, bq->init_data.vovp},
+ {F_VINDPM, bq->init_data.vindpm},
};
/*
@@ -687,10 +707,23 @@ static ssize_t bq24257_show_ovp_voltage(struct device *dev,
bq24257_vovp_map[bq->init_data.vovp]);
}
+static ssize_t bq24257_show_in_dpm_voltage(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct power_supply *psy = dev_get_drvdata(dev);
+ struct bq24257_device *bq = power_supply_get_drvdata(psy);
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n",
+ bq24257_vindpm_map[bq->init_data.vindpm]);
+}
+
static DEVICE_ATTR(ovp_voltage, S_IRUGO, bq24257_show_ovp_voltage, NULL);
+static DEVICE_ATTR(in_dpm_voltage, S_IRUGO, bq24257_show_in_dpm_voltage, NULL);
static struct attribute *bq24257_charger_attr[] = {
&dev_attr_ovp_voltage.attr,
+ &dev_attr_in_dpm_voltage.attr,
NULL,
};
@@ -785,6 +818,16 @@ static int bq24257_fw_probe(struct bq24257_device *bq)
bq24257_vovp_map,
BQ24257_VOVP_MAP_SIZE);
+ ret = device_property_read_u32(bq->dev, "ti,in-dpm-voltage",
+ &property);
+ if (ret < 0)
+ bq->init_data.vindpm = VINDPM_4360;
+ else
+ bq->init_data.vindpm =
+ bq24257_find_idx(property,
+ bq24257_vindpm_map,
+ BQ24257_VINDPM_MAP_SIZE);
+
return 0;
}
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