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power: bq24257: Allow manual setting of input current limit

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A new optional device property called "ti,current-limit" is introduced
to allow disabling the D+/D- USB signal-based charger type auto-
detection algorithm used to set the input current limit and instead to
use a fixed input current limit.

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Andreas Dannenberg 2015-09-28 17:33:55 -05:00 committed by Sebastian Reichel
parent 7ef62365c6
commit eb9fbcc669
1 changed files with 73 additions and 16 deletions
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89
drivers/power/bq24257_charger.c
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@ -77,6 +77,7 @@ struct bq24257_init_data {
u8 ichg; /* charge current */
u8 vbat; /* regulation voltage */
u8 iterm; /* termination current */
u8 iilimit; /* input current limit */
};
struct bq24257_state {
@ -103,6 +104,8 @@ struct bq24257_device {
struct bq24257_state state;
struct mutex lock; /* protect state data */
bool iilimit_autoset_enable;
};
static bool bq24257_is_volatile_reg(struct device *dev, unsigned int reg)
@ -191,6 +194,12 @@ static const u32 bq24257_iterm_map[] = {
#define BQ24257_ITERM_MAP_SIZE ARRAY_SIZE(bq24257_iterm_map)
static const u32 bq24257_iilimit_map[] = {
100000, 150000, 500000, 900000, 1500000, 2000000
};
#define BQ24257_IILIMIT_MAP_SIZE ARRAY_SIZE(bq24257_iilimit_map)
static int bq24257_field_read(struct bq24257_device *bq,
enum bq24257_fields field_id)
{
@ -480,24 +489,32 @@ static void bq24257_handle_state_change(struct bq24257_device *bq,
old_state = bq->state;
mutex_unlock(&bq->lock);
/*
* Handle BQ2425x state changes observing whether the D+/D- based input
* current limit autoset functionality is enabled.
*/
if (!new_state->power_good) {
dev_dbg(bq->dev, "Power removed\n");
cancel_delayed_work_sync(&bq->iilimit_setup_work);
if (bq->iilimit_autoset_enable) {
cancel_delayed_work_sync(&bq->iilimit_setup_work);
/* activate D+/D- port detection algorithm */
ret = bq24257_field_write(bq, F_DPDM_EN, 1);
if (ret < 0)
goto error;
/* activate D+/D- port detection algorithm */
ret = bq24257_field_write(bq, F_DPDM_EN, 1);
if (ret < 0)
goto error;
/* reset input current limit */
ret = bq24257_field_write(bq, F_IILIMIT, IILIMIT_500);
if (ret < 0)
goto error;
/* reset input current limit */
ret = bq24257_field_write(bq, F_IILIMIT,
bq->init_data.iilimit);
if (ret < 0)
goto error;
}
} else if (!old_state.power_good) {
dev_dbg(bq->dev, "Power inserted\n");
/* configure input current limit */
schedule_delayed_work(&bq->iilimit_setup_work,
if (bq->iilimit_autoset_enable)
/* configure input current limit */
schedule_delayed_work(&bq->iilimit_setup_work,
msecs_to_jiffies(BQ24257_ILIM_SET_DELAY));
} else if (new_state->fault == FAULT_NO_BAT) {
dev_warn(bq->dev, "Battery removed\n");
@ -577,7 +594,16 @@ static int bq24257_hw_init(struct bq24257_device *bq)
bq->state = state;
mutex_unlock(&bq->lock);
if (!state.power_good)
if (!bq->iilimit_autoset_enable) {
dev_dbg(bq->dev, "manually setting iilimit = %u\n",
bq->init_data.iilimit);
/* program fixed input current limit */
ret = bq24257_field_write(bq, F_IILIMIT,
bq->init_data.iilimit);
if (ret < 0)
return ret;
} else if (!state.power_good)
/* activate D+/D- detection algorithm */
ret = bq24257_field_write(bq, F_DPDM_EN, 1);
else if (state.fault != FAULT_NO_BAT)
@ -641,6 +667,7 @@ static int bq24257_fw_probe(struct bq24257_device *bq)
int ret;
u32 property;
/* Required properties */
ret = device_property_read_u32(bq->dev, "ti,charge-current", &property);
if (ret < 0)
return ret;
@ -664,6 +691,24 @@ static int bq24257_fw_probe(struct bq24257_device *bq)
bq->init_data.iterm = bq24257_find_idx(property, bq24257_iterm_map,
BQ24257_ITERM_MAP_SIZE);
/* Optional properties. If not provided use reasonable default. */
ret = device_property_read_u32(bq->dev, "ti,current-limit",
&property);
if (ret < 0) {
bq->iilimit_autoset_enable = true;
/*
* Explicitly set a default value which will be needed for
* devices that don't support the automatic setting of the input
* current limit through the charger type detection mechanism.
*/
bq->init_data.iilimit = IILIMIT_500;
} else
bq->init_data.iilimit =
bq24257_find_idx(property,
bq24257_iilimit_map,
BQ24257_IILIMIT_MAP_SIZE);
return 0;
}
@ -722,8 +767,6 @@ static int bq24257_probe(struct i2c_client *client,
i2c_set_clientdata(client, bq);
INIT_DELAYED_WORK(&bq->iilimit_setup_work, bq24257_iilimit_setup_work);
if (!dev->platform_data) {
ret = bq24257_fw_probe(bq);
if (ret < 0) {
@ -734,6 +777,18 @@ static int bq24257_probe(struct i2c_client *client,
return -ENODEV;
}
/*
* The BQ24250 doesn't support the D+/D- based charger type detection
* used for the automatic setting of the input current limit setting so
* explicitly disable that feature.
*/
if (bq->chip == BQ24250)
bq->iilimit_autoset_enable = false;
if (bq->iilimit_autoset_enable)
INIT_DELAYED_WORK(&bq->iilimit_setup_work,
bq24257_iilimit_setup_work);
/* we can only check Power Good status by probing the PG pin */
ret = bq24257_pg_gpio_probe(bq);
if (ret < 0)
@ -780,7 +835,8 @@ static int bq24257_remove(struct i2c_client *client)
{
struct bq24257_device *bq = i2c_get_clientdata(client);
cancel_delayed_work_sync(&bq->iilimit_setup_work);
if (bq->iilimit_autoset_enable)
cancel_delayed_work_sync(&bq->iilimit_setup_work);
bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */
@ -793,7 +849,8 @@ static int bq24257_suspend(struct device *dev)
struct bq24257_device *bq = dev_get_drvdata(dev);
int ret = 0;
cancel_delayed_work_sync(&bq->iilimit_setup_work);
if (bq->iilimit_autoset_enable)
cancel_delayed_work_sync(&bq->iilimit_setup_work);
/* reset all registers to default (and activate standalone mode) */
ret = bq24257_field_write(bq, F_RESET, 1);