diff options
| -rw-r--r-- | drivers/power/bq24257_charger.c | 93 |
1 files changed, 75 insertions, 18 deletions
diff --git a/drivers/power/bq24257_charger.c b/drivers/power/bq24257_charger.c index 93f75820020a..7bbff806624f 100644 --- a/drivers/power/bq24257_charger.c +++ b/drivers/power/bq24257_charger.c @@ -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); - - /* 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; + 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; + + /* 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); |