From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Dannenberg Subject: [PATCH v3 04/10] power: bq24257: Allow manual setting of input current limit Date: Fri, 11 Sep 2015 15:26:36 -0500 Message-ID: <1442003202-1430-5-git-send-email-dannenberg@ti.com> References: <1442003202-1430-1-git-send-email-dannenberg@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1442003202-1430-1-git-send-email-dannenberg@ti.com> Sender: linux-pm-owner@vger.kernel.org To: Sebastian Reichel , Dmitry Eremin-Solenikov , David Woodhouse , Laurentiu Palcu , Krzysztof Kozlowski Cc: Ramakrishna Pallala , linux-pm@vger.kernel.org, devicetree@vger.kernel.org, Andreas Dannenberg List-Id: devicetree@vger.kernel.org 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 --- drivers/power/bq24257_charger.c | 102 +++++++++++++++++++++++++++++++--------- 1 file changed, 81 insertions(+), 21 deletions(-) diff --git a/drivers/power/bq24257_charger.c b/drivers/power/bq24257_charger.c index fdfe855..55e4ee4 100644 --- a/drivers/power/bq24257_charger.c +++ b/drivers/power/bq24257_charger.c @@ -74,6 +74,7 @@ struct bq24257_init_data { u8 ichg; /* charge current */ u8 vbat; /* regulation voltage */ u8 iterm; /* termination current */ + u8 in_ilimit; /* input current limit */ }; struct bq24257_state { @@ -100,6 +101,8 @@ struct bq24257_device { struct bq24257_state state; struct mutex lock; /* protect state data */ + + bool in_ilimit_autoset_disable; }; static bool bq24257_is_volatile_reg(struct device *dev, unsigned int reg) @@ -188,6 +191,12 @@ 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) { @@ -479,24 +488,35 @@ static void bq24257_handle_state_change(struct bq24257_device *bq, old_state = bq->state; mutex_unlock(&bq->lock); - if (!new_state->power_good) { /* power removed */ - 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; + /* + * 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"); + if (!bq->in_ilimit_autoset_disable) { + cancel_delayed_work_sync(&bq->iilimit_setup_work); - reset_iilimit = true; - } else if (!old_state.power_good) { /* power inserted */ - config_iilimit = true; - } else if (new_state->fault == FAULT_NO_BAT) { /* battery removed */ - 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_iilimit = true; - } else if (old_state.fault == FAULT_NO_BAT) { /* battery connected */ - config_iilimit = true; - } else if (new_state->fault == FAULT_TIMER) { /* safety timer expired */ + reset_iilimit = true; + } + } else if (!old_state.power_good) { + dev_dbg(bq->dev, "Power inserted\n"); + config_iilimit = !bq->in_ilimit_autoset_disable; + } else if (new_state->fault == FAULT_NO_BAT) { + dev_warn(bq->dev, "Battery removed\n"); + if (!bq->in_ilimit_autoset_disable) { + cancel_delayed_work_sync(&bq->iilimit_setup_work); + reset_iilimit = true; + } + } else if (old_state.fault == FAULT_NO_BAT) { + dev_warn(bq->dev, "Battery connected\n"); + config_iilimit = !bq->in_ilimit_autoset_disable; + } else if (new_state->fault == FAULT_TIMER) { dev_err(bq->dev, "Safety timer expired! Battery dead?\n"); } @@ -581,7 +601,16 @@ static int bq24257_hw_init(struct bq24257_device *bq) bq->state = state; mutex_unlock(&bq->lock); - if (!state.power_good) + if (bq->in_ilimit_autoset_disable) { + dev_dbg(bq->dev, "manually setting iilimit = %d\n", + bq->init_data.in_ilimit); + + /* program fixed input current limit */ + ret = bq24257_field_write(bq, F_IILIMIT, + bq->init_data.in_ilimit); + 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) @@ -659,6 +688,7 @@ 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; @@ -682,6 +712,24 @@ 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) + /* + * 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.in_ilimit = IILIMIT_500; + else { + bq->in_ilimit_autoset_disable = true; + bq->init_data.in_ilimit = + bq24257_find_idx(property, + bq24257_iilimit_map, + BQ24257_IILIMIT_MAP_SIZE); + } + return 0; } @@ -740,8 +788,6 @@ 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) { @@ -752,6 +798,18 @@ 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->in_ilimit_autoset_disable = true; + + if (!bq->in_ilimit_autoset_disable) + 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) @@ -804,7 +862,8 @@ 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->in_ilimit_autoset_disable) + cancel_delayed_work_sync(&bq->iilimit_setup_work); power_supply_unregister(bq->charger); @@ -819,7 +878,8 @@ 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->in_ilimit_autoset_disable) + 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); -- 1.9.1