From patchwork Mon Sep 28 22:33:55 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Dannenberg X-Patchwork-Id: 7281381 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 2BD0B9F536 for ; Mon, 28 Sep 2015 22:35:19 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2CCEC206EB for ; Mon, 28 Sep 2015 22:35:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DA58720726 for ; Mon, 28 Sep 2015 22:35:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753768AbbI1WfO (ORCPT ); Mon, 28 Sep 2015 18:35:14 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:55624 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754140AbbI1WfM (ORCPT ); Mon, 28 Sep 2015 18:35:12 -0400 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id t8SMYVm8029518; Mon, 28 Sep 2015 17:34:31 -0500 Received: from DFLE73.ent.ti.com (dfle73.ent.ti.com [128.247.5.110]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id t8SMYV0e021759; Mon, 28 Sep 2015 17:34:31 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE73.ent.ti.com (128.247.5.110) with Microsoft SMTP Server id 14.3.224.2; Mon, 28 Sep 2015 17:34:31 -0500 Received: from beast.tx.rr.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id t8SMY56G026609; Mon, 28 Sep 2015 17:34:28 -0500 From: Andreas Dannenberg To: Sebastian Reichel , Dmitry Eremin-Solenikov , David Woodhouse , Laurentiu Palcu , Krzysztof Kozlowski CC: Ramakrishna Pallala , , , , Andreas Dannenberg Subject: [PATCH v8 07/14] power: bq24257: Allow manual setting of input current limit Date: Mon, 28 Sep 2015 17:33:55 -0500 Message-ID: <1443479642-23712-8-git-send-email-dannenberg@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1443479642-23712-1-git-send-email-dannenberg@ti.com> References: <1443479642-23712-1-git-send-email-dannenberg@ti.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Krzysztof Kozlowski --- drivers/power/bq24257_charger.c | 93 +++++++++++++++++++++++++++++++++-------- 1 file changed, 75 insertions(+), 18 deletions(-) diff --git a/drivers/power/bq24257_charger.c b/drivers/power/bq24257_charger.c index 93f7582..7bbff80 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);