From patchwork Mon Sep 3 08:55:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "(Exiting) Baolin Wang" X-Patchwork-Id: 10585619 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B51CF920 for ; Mon, 3 Sep 2018 08:56:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A67A929188 for ; Mon, 3 Sep 2018 08:56:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9A0AD2951A; Mon, 3 Sep 2018 08:56:11 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A1E4F29188 for ; Mon, 3 Sep 2018 08:56:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726203AbeICNPT (ORCPT ); Mon, 3 Sep 2018 09:15:19 -0400 Received: from mail-pf1-f193.google.com ([209.85.210.193]:45026 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727169AbeICNPS (ORCPT ); Mon, 3 Sep 2018 09:15:18 -0400 Received: by mail-pf1-f193.google.com with SMTP id k21-v6so8397804pff.11 for ; Mon, 03 Sep 2018 01:56:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=UOQet7E7Hfdv3dI1+Gr2CMPA0yb1HXOOB0tzkNxEsn8=; b=iPUN5RPdke1K7H08hsQCWhHlCJQKskUOgXUqvu2xIIQjP/7cIGOWWCmDV92w8XrOhG ZMhot6eFPQksEm+05yrtQGFqmV0yHmle0h8kiyWPK0VJvh2P0gsMH9i9zkrNS+7CEja0 RnL6sUUeGO59HxNcRC3kgG5TMCSKQRDCTzs2A= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=UOQet7E7Hfdv3dI1+Gr2CMPA0yb1HXOOB0tzkNxEsn8=; b=fGDsUdWIqf0yAF9h5sLZ/NOON8UUd9StFJYWpK9goTMdDkvsd1usY+OVKlJxbh7viw 8eraGf1a7xBIg5FjdPQKrJyEdM3v7uF4rPNxlBWCznEjz6VsqwjgyBOyNGKAwwGn5SYa 1XASp46saTqlbbeSq18yFeH8xgL7LbIhhZjzSXKTWL81jFhqi6wo+urx8dDIx7L1baaX VFX5JpFN0I96kzDaykd9ckJ5bpherBSqK5BntZNHfgVmlWMhWGq8c2lrTLD6puNfqTuo 8mMW6kQIxzYo7DTqt6Eyp6R2rjNsEKn5P2foz6P5muYmIPUpg3NMwYnQQaIq28rYFYq1 epmg== X-Gm-Message-State: APzg51AFTOX7POhtfI4Ywyxy8hGEarMaWw8AEviqYJDVJkV0KMmsIdxl /gWxzBxpGSwOCEfwV38Yw1h2WQ== X-Google-Smtp-Source: ANB0Vdb4aLvgb9Bt5zLVGaoYw/QUE9wGvOAlOtrUAYQeAJqTUezHh+QGbM8qfnfkYGNlAS7kOAq06g== X-Received: by 2002:a63:231c:: with SMTP id j28-v6mr24892011pgj.332.1535964967301; Mon, 03 Sep 2018 01:56:07 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id 87-v6sm30984814pfn.103.2018.09.03.01.56.04 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 03 Sep 2018 01:56:06 -0700 (PDT) From: Baolin Wang To: sre@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, yuanjiang.yu@unisoc.com, baolin.wang@linaro.org, broonie@kernel.org, krzk@kernel.org Subject: [PATCH v2 2/2] power: supply: Add Spreadtrum SC2731 charger support Date: Mon, 3 Sep 2018 16:55:46 +0800 Message-Id: <22074e17cb853123f926e909eac4418d88af0b98.1535964281.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds the SC2731 PMIC switch charger support. Signed-off-by: Baolin Wang Reviewed-by: Krzysztof Kozlowski --- Changes from v1: - Remove some redundant head files. - Add one mutex to make sure getting the charger status is correct. - Fix some coding style issues. - Use standard DT properties. --- drivers/power/supply/Kconfig | 7 + drivers/power/supply/Makefile | 1 + drivers/power/supply/sc2731_charger.c | 503 +++++++++++++++++++++++++++++++++ 3 files changed, 511 insertions(+) create mode 100644 drivers/power/supply/sc2731_charger.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index ff6dab0..f27cf07 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -645,4 +645,11 @@ config CHARGER_CROS_USBPD what is connected to USB PD ports from the EC and converts that into power_supply properties. +config CHARGER_SC2731 + tristate "Spreadtrum SC2731 charger driver" + depends on MFD_SC27XX_PMIC || COMPILE_TEST + help + Say Y here to enable support for battery charging with SC2731 + PMIC chips. + endif # POWER_SUPPLY diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index a26b402..767105b 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -85,3 +85,4 @@ obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o obj-$(CONFIG_CHARGER_CROS_USBPD) += cros_usbpd-charger.o +obj-$(CONFIG_CHARGER_SC2731) += sc2731_charger.o diff --git a/drivers/power/supply/sc2731_charger.c b/drivers/power/supply/sc2731_charger.c new file mode 100644 index 0000000..c92e5fc --- /dev/null +++ b/drivers/power/supply/sc2731_charger.c @@ -0,0 +1,503 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Spreadtrum Communications Inc. + +#include +#include +#include +#include +#include +#include +#include + +/* PMIC global registers definition */ +#define SC2731_CHARGE_STATUS 0xedc +#define SC2731_CHARGE_FULL BIT(4) +#define SC2731_MODULE_EN1 0xc0c +#define SC2731_CHARGE_EN BIT(5) + +/* SC2731 switch charger registers definition */ +#define SC2731_CHG_CFG0 0x0 +#define SC2731_CHG_CFG1 0x4 +#define SC2731_CHG_CFG2 0x8 +#define SC2731_CHG_CFG3 0xc +#define SC2731_CHG_CFG4 0x10 +#define SC2731_CHG_CFG5 0x28 + +/* SC2731_CHG_CFG0 register definition */ +#define SC2731_PRECHG_RNG_SHIFT 11 +#define SC2731_PRECHG_RNG_MASK GENMASK(12, 11) + +#define SC2731_TERMINATION_VOL_MASK GENMASK(2, 1) +#define SC2731_TERMINATION_VOL_SHIFT 1 +#define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3) +#define SC2731_TERMINATION_VOL_CAL_SHIFT 3 +#define SC2731_TERMINATION_CUR_MASK GENMASK(2, 0) + +#define SC2731_CC_EN BIT(13) +#define SC2731_CHARGER_PD BIT(0) + +/* SC2731_CHG_CFG1 register definition */ +#define SC2731_CUR_MASK GENMASK(5, 0) + +/* SC2731_CHG_CFG5 register definition */ +#define SC2731_CUR_LIMIT_SHIFT 8 +#define SC2731_CUR_LIMIT_MASK GENMASK(9, 8) + +/* Default current definition (unit is mA) */ +#define SC2731_CURRENT_LIMIT_100 100 +#define SC2731_CURRENT_LIMIT_500 500 +#define SC2731_CURRENT_LIMIT_900 900 +#define SC2731_CURRENT_LIMIT_2000 2000 +#define SC2731_CURRENT_PRECHG 450 +#define SC2731_CURRENT_STEP 50 + +struct sc2731_charger_info { + struct device *dev; + struct regmap *regmap; + struct usb_phy *usb_phy; + struct notifier_block usb_notify; + struct power_supply *psy_usb; + struct mutex lock; + bool charging; + u32 base; +}; + +static void sc2731_charger_stop_charge(struct sc2731_charger_info *info) +{ + regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, + SC2731_CC_EN, 0); + + regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, + SC2731_CHARGER_PD, SC2731_CHARGER_PD); +} + +static int sc2731_charger_start_charge(struct sc2731_charger_info *info) +{ + int ret; + + /* Enable charger constant current mode */ + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, + SC2731_CC_EN, SC2731_CC_EN); + if (ret) + return ret; + + /* Start charging */ + return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, + SC2731_CHARGER_PD, 0); +} + +static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info, + u32 limit) +{ + u32 val; + + if (limit <= SC2731_CURRENT_LIMIT_100) + val = 0; + else if (limit <= SC2731_CURRENT_LIMIT_500) + val = 3; + else if (limit <= SC2731_CURRENT_LIMIT_900) + val = 2; + else + val = 1; + + return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5, + SC2731_CUR_LIMIT_MASK, + val << SC2731_CUR_LIMIT_SHIFT); +} + +static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur) +{ + u32 val; + int ret; + + if (cur > SC2731_CURRENT_LIMIT_2000) + cur = SC2731_CURRENT_LIMIT_2000; + else if (cur < SC2731_CURRENT_PRECHG) + cur = SC2731_CURRENT_PRECHG; + + /* Calculate the step value, each step is 50 mA */ + val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP; + + /* Set pre-charge current as 450 mA */ + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, + SC2731_PRECHG_RNG_MASK, + 0x3 << SC2731_PRECHG_RNG_SHIFT); + if (ret) + return ret; + + return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1, + SC2731_CUR_MASK, val); +} + +static int sc2731_charger_get_status(struct sc2731_charger_info *info) +{ + u32 val; + int ret; + + ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val); + if (ret) + return ret; + + if (val & SC2731_CHARGE_FULL) + return POWER_SUPPLY_STATUS_FULL; + + return POWER_SUPPLY_STATUS_CHARGING; +} + +static int sc2731_charger_get_current(struct sc2731_charger_info *info, + u32 *cur) +{ + int ret; + u32 val; + + ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val); + if (ret) + return ret; + + val &= SC2731_CUR_MASK; + *cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG; + + return 0; +} + +static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info, + u32 *cur) +{ + int ret; + u32 val; + + ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val); + if (ret) + return ret; + + val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT; + + switch (val) { + case 0: + *cur = SC2731_CURRENT_LIMIT_100; + break; + + case 1: + *cur = SC2731_CURRENT_LIMIT_2000; + break; + + case 2: + *cur = SC2731_CURRENT_LIMIT_900; + break; + + case 3: + *cur = SC2731_CURRENT_LIMIT_500; + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int +sc2731_charger_usb_set_property(struct power_supply *psy, + enum power_supply_property psp, + const union power_supply_propval *val) +{ + struct sc2731_charger_info *info = power_supply_get_drvdata(psy); + int ret; + + mutex_lock(&info->lock); + + if (!info->charging) { + mutex_unlock(&info->lock); + return -ENODEV; + } + + switch (psp) { + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + ret = sc2731_charger_set_current(info, val->intval); + if (ret < 0) + dev_err(info->dev, "set charge current failed\n"); + break; + + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + ret = sc2731_charger_set_current_limit(info, val->intval); + if (ret < 0) + dev_err(info->dev, "set input current limit failed\n"); + break; + + default: + ret = -EINVAL; + } + + mutex_unlock(&info->lock); + return ret; +} + +static int sc2731_charger_usb_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct sc2731_charger_info *info = power_supply_get_drvdata(psy); + int ret = 0; + u32 cur; + + mutex_lock(&info->lock); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + if (info->charging) + val->intval = sc2731_charger_get_status(info); + else + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + if (!info->charging) { + val->intval = 0; + } else { + ret = sc2731_charger_get_current(info, &cur); + if (ret) + goto out; + + val->intval = cur; + } + break; + + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + if (!info->charging) { + val->intval = 0; + } else { + ret = sc2731_charger_get_current_limit(info, &cur); + if (ret) + goto out; + + val->intval = cur; + } + break; + + default: + ret = -EINVAL; + } + +out: + mutex_unlock(&info->lock); + return ret; +} + +static int sc2731_charger_property_is_writeable(struct power_supply *psy, + enum power_supply_property psp) +{ + int ret; + + switch (psp) { + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + ret = 1; + break; + + default: + ret = 0; + } + + return ret; +} + +static enum power_supply_property sc2731_usb_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, +}; + +static const struct power_supply_desc sc2731_charger_desc = { + .name = "sc2731_charger", + .type = POWER_SUPPLY_TYPE_USB, + .properties = sc2731_usb_props, + .num_properties = ARRAY_SIZE(sc2731_usb_props), + .get_property = sc2731_charger_usb_get_property, + .set_property = sc2731_charger_usb_set_property, + .property_is_writeable = sc2731_charger_property_is_writeable, +}; + +static int sc2731_charger_usb_change(struct notifier_block *nb, + unsigned long limit, void *data) +{ + struct sc2731_charger_info *info = + container_of(nb, struct sc2731_charger_info, usb_notify); + int ret = 0; + + mutex_lock(&info->lock); + + if (limit > 0) { + /* set current limitation and start to charge */ + ret = sc2731_charger_set_current_limit(info, limit); + if (ret) + goto out; + + ret = sc2731_charger_set_current(info, limit); + if (ret) + goto out; + + ret = sc2731_charger_start_charge(info); + if (ret) + goto out; + + info->charging = true; + } else { + /* Stop charging */ + info->charging = false; + sc2731_charger_stop_charge(info); + } + +out: + mutex_unlock(&info->lock); + return ret; +} + +static int sc2731_charger_hw_init(struct sc2731_charger_info *info) +{ + struct power_supply_battery_info bat_info = { }; + u32 term_currrent, term_voltage, cur_val, vol_val; + int ret; + + /* Enable charger module */ + ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1, + SC2731_CHARGE_EN, SC2731_CHARGE_EN); + if (ret) + return ret; + + ret = power_supply_get_battery_info(info->psy_usb, &bat_info); + if (ret) { + dev_warn(info->dev, "no battery information is supplied\n"); + + /* + * If no battery information is supplied, we should set + * default charge termination current to 120 mA, and default + * charge termination voltage to 4.35V. + */ + cur_val = 0x2; + vol_val = 0x1; + } else { + term_currrent = bat_info.charge_term_current_ua / 1000; + + if (term_currrent <= 90) + cur_val = 0; + else if (term_currrent >= 265) + cur_val = 0x7; + else + cur_val = ((term_currrent - 90) / 25) + 1; + + term_voltage = bat_info.constant_charge_voltage_max_uv / 1000; + + if (term_voltage > 4500) + term_voltage = 4500; + + if (term_voltage > 4200) + vol_val = (term_voltage - 4200) / 100; + else + vol_val = 0; + } + + /* Set charge termination current */ + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2, + SC2731_TERMINATION_CUR_MASK, cur_val); + if (ret) + goto error; + + /* Set charge termination voltage */ + ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0, + SC2731_TERMINATION_VOL_MASK | + SC2731_TERMINATION_VOL_CAL_MASK, + (vol_val << SC2731_TERMINATION_VOL_SHIFT) | + (0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT)); + if (ret) + goto error; + + return 0; + +error: + regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0); + return ret; +} + +static int sc2731_charger_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct sc2731_charger_info *info; + struct power_supply_config charger_cfg = { }; + int ret; + + info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + mutex_init(&info->lock); + info->dev = &pdev->dev; + + info->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!info->regmap) { + dev_err(&pdev->dev, "failed to get charger regmap\n"); + return -ENODEV; + } + + ret = of_property_read_u32(np, "reg", &info->base); + if (ret) { + dev_err(&pdev->dev, "failed to get register address\n"); + return -ENODEV; + } + + charger_cfg.drv_data = info; + charger_cfg.of_node = np; + info->psy_usb = devm_power_supply_register(&pdev->dev, + &sc2731_charger_desc, + &charger_cfg); + if (IS_ERR(info->psy_usb)) { + dev_err(&pdev->dev, "failed to register power supply\n"); + return PTR_ERR(info->psy_usb); + } + + ret = sc2731_charger_hw_init(info); + if (ret) + return ret; + + info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0); + if (IS_ERR(info->usb_phy)) { + dev_err(&pdev->dev, "failed to find USB phy\n"); + return PTR_ERR(info->usb_phy); + } + + info->usb_notify.notifier_call = sc2731_charger_usb_change; + ret = usb_register_notifier(info->usb_phy, &info->usb_notify); + if (ret) { + dev_err(&pdev->dev, "failed to register notifier: %d\n", ret); + return ret; + } + + return 0; +} + +static int sc2731_charger_remove(struct platform_device *pdev) +{ + struct sc2731_charger_info *info = platform_get_drvdata(pdev); + + usb_unregister_notifier(info->usb_phy, &info->usb_notify); + + return 0; +} + +static const struct of_device_id sc2731_charger_of_match[] = { + { .compatible = "sprd,sc2731-charger", }, + { } +}; + +static struct platform_driver sc2731_charger_driver = { + .driver = { + .name = "sc2731-charger", + .of_match_table = sc2731_charger_of_match, + }, + .probe = sc2731_charger_probe, + .remove = sc2731_charger_remove, +}; + +module_platform_driver(sc2731_charger_driver); + +MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver"); +MODULE_LICENSE("GPL v2");