From patchwork Wed Sep 12 07:29:38 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: 10596899 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 BE8D813BF for ; Wed, 12 Sep 2018 07:30:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E212297F0 for ; Wed, 12 Sep 2018 07:30:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9C24A2991E; Wed, 12 Sep 2018 07:30:19 +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 22414297F0 for ; Wed, 12 Sep 2018 07:30:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726860AbeILMdb (ORCPT ); Wed, 12 Sep 2018 08:33:31 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:43851 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726412AbeILMdb (ORCPT ); Wed, 12 Sep 2018 08:33:31 -0400 Received: by mail-pg1-f195.google.com with SMTP id v66-v6so577407pgb.10 for ; Wed, 12 Sep 2018 00:30:17 -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; bh=6a2K6qNZh60/sMvmbkck3n+/n6PkI3DTt1DQ2AdQSgY=; b=iPorLxcRqqnX36iDXtgmi7Uj/mY/V2wO58pdn9ts1QvQjMjGFgApquqSnqj+VJxtXQ Ye20L4jSxMA9Z1wn9zN9gg+jkhKpwm0tgxSy2TOM7On5c19ONvuisZCXAnqL9De6jocQ Bqafvr3uG2rdZTUHJ31dTxvL7XysfnQUMSH0o= 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; bh=6a2K6qNZh60/sMvmbkck3n+/n6PkI3DTt1DQ2AdQSgY=; b=qHn8VTDtXosYH0GACu+/WiQcB5JNVUtSkWkyubISy1Xk7Ur7h/bfpBNTjZUG/tmA8f 3mqHrejtXBH98x2SvdZqN0b8hr8vOr6Xy0nJhR89ROm9f49ldHJ7+YyJFXr7c3gkioao iWTKVca6iR8519AH8Vqrnxk0zyXNbB0adfVIjDLdk9QTdz12ntu6/p9rJs8N5bZ1w5aR VlPLx1NWbymmjl8akZF1cSEL2+75iomeLNKGXsU6YgOOrqSkaU4dLSCaswgY/3U9U/wb 3EPL67OtdfsB5aoS529HW3BRglp+QtbL/Y8tS1pxyAXwqcMLUXEVeKB29xtExgXwH25F b2tg== X-Gm-Message-State: APzg51Bi6I338rEk3MXdFnbHbiq+v53Q7dlIG/ilLpa9+jSz0ODjbHuI R6oxH6vJ79YFuPtTSqxPob0WIQ== X-Google-Smtp-Source: ANB0VdYV65omcXOQ4TkODt9E9TqncsJkdfLEIppG0ahYeQgjrOIHvmXyv0ysdW5LPiMmyviTy39igA== X-Received: by 2002:a63:221b:: with SMTP id i27-v6mr629030pgi.212.1536737417455; Wed, 12 Sep 2018 00:30:17 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id y69-v6sm624695pfd.36.2018.09.12.00.30.14 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 12 Sep 2018 00:30:16 -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 Subject: [PATCH 1/2] dt-bindings: power: Add Spreadtrum SC27XX fuel gauge unit documentation Date: Wed, 12 Sep 2018 15:29:38 +0800 Message-Id: <1b3f165e2a806dd3d4b7712160ee3bda72f7d675.1536736399.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 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 binding documentation for Spreadtrum SC27XX series PMICs fuel gauge unit device, which is used to calculate the battery capacity. Signed-off-by: Baolin Wang --- .../devicetree/bindings/power/supply/sc27xx-fg.txt | 55 ++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt diff --git a/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt new file mode 100644 index 0000000..7447bae --- /dev/null +++ b/Documentation/devicetree/bindings/power/supply/sc27xx-fg.txt @@ -0,0 +1,55 @@ +Spreadtrum SC27XX PMICs Fuel Gauge Unit Power Supply Bindings + +Required properties: +- compatible: Should be one of the following: + "sprd,sc2720-fgu", + "sprd,sc2721-fgu", + "sprd,sc2723-fgu", + "sprd,sc2730-fgu", + "sprd,sc2731-fgu". +- reg: The address offset of fuel gauge unit. +- bat-detect-gpio: GPIO for battery detection. +- io-channels: Specify the IIO ADC channel to get temperature. +- io-channel-names: Should be "bat-temp". +- sprd,inner-resist: Specify the the battery inner resistance (mOhm). +- sprd,ocv-cap-table: Provide the battery capacity percent with corresponding + open circuit voltage (ocv) of the battery, which is used to look up current + battery capacity according to current baterry ocv values. +- monitored-battery: Phandle of battery characteristics devicetree node. + The fuel gauge uses the following battery properties: +- charge-full-design-microamp-hours: battery design capacity. +- constant-charge-voltage-max-microvolt: maximum constant input voltage. + See Documentation/devicetree/bindings/power/supply/battery.txt + +Example: + + bat: battery { + compatible = "simple-battery"; + charge-full-design-microamp-hours = <1900000>; + constant-charge-voltage-max-microvolt = <4350000>; + ...... + }; + + sc2731_pmic: pmic@0 { + compatible = "sprd,sc2731"; + reg = <0>; + spi-max-frequency = <26000000>; + interrupts = ; + interrupt-controller; + #interrupt-cells = <2>; + #address-cells = <1>; + #size-cells = <0>; + + fgu@a00 { + compatible = "sprd,sc2731-fgu"; + reg = <0xa00>; + bat-detect-gpio = <&pmic_eic 9 GPIO_ACTIVE_HIGH>; + io-channels = <&pmic_adc 5>; + io-channel-names = "bat-temp"; + sprd,inner-resist = <250>; + sprd,ocv-cap-table = <4185 100>, <4113 95>, <4066 90>, <4022 85>, <3983 80>, <3949 75>, <3917 70>, + <3889 65>, <3864 60>, <3835 55>, <3805 50>, <3787 45>, <3777 40>, <3773 35>, <3770 30>, + <3765 25>, <3752 20>, <3724 15>, <3680 10>, <3605 5>, <3400 0>; + monitored-battery = <&bat>; + }; + }; From patchwork Wed Sep 12 07:29:39 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: 10596901 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 BA852112B for ; 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Wed, 12 Sep 2018 00:30:20 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id y69-v6sm624695pfd.36.2018.09.12.00.30.17 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 12 Sep 2018 00:30:20 -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 Subject: [PATCH 2/2] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver Date: Wed, 12 Sep 2018 15:29:39 +0800 Message-Id: <1295864a38810a6db6c97e298c6663ae2b1350c1.1536736399.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1b3f165e2a806dd3d4b7712160ee3bda72f7d675.1536736399.git.baolin.wang@linaro.org> References: <1b3f165e2a806dd3d4b7712160ee3bda72f7d675.1536736399.git.baolin.wang@linaro.org> In-Reply-To: <1b3f165e2a806dd3d4b7712160ee3bda72f7d675.1536736399.git.baolin.wang@linaro.org> References: <1b3f165e2a806dd3d4b7712160ee3bda72f7d675.1536736399.git.baolin.wang@linaro.org> 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 Spreadtrum SC27XX serial PMICs fuel gauge support, which is used to calculate the battery capacity. Original-by: Yuanjiang Yu Signed-off-by: Baolin Wang --- drivers/power/supply/Kconfig | 7 + drivers/power/supply/Makefile | 1 + drivers/power/supply/sc27xx_fuel_gauge.c | 705 ++++++++++++++++++++++++++++++ 3 files changed, 713 insertions(+) create mode 100644 drivers/power/supply/sc27xx_fuel_gauge.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index f27cf07..917f4b7 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -652,4 +652,11 @@ config CHARGER_SC2731 Say Y here to enable support for battery charging with SC2731 PMIC chips. +config FUEL_GAUGE_SC27XX + tristate "Spreadtrum SC27XX fuel gauge driver" + depends on MFD_SC27XX_PMIC || COMPILE_TEST + help + Say Y here to enable support for fuel gauge with SC27XX + PMIC chips. + endif # POWER_SUPPLY diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index 767105b..b731c2a 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -86,3 +86,4 @@ 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 +obj-$(CONFIG_FUEL_GAUGE_SC27XX) += sc27xx_fuel_gauge.o diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c new file mode 100644 index 0000000..4df0f47 --- /dev/null +++ b/drivers/power/supply/sc27xx_fuel_gauge.c @@ -0,0 +1,705 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Spreadtrum Communications Inc. + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* PMIC global control registers definition */ +#define SC27XX_MODULE_EN0 0xc08 +#define SC27XX_CLK_EN0 0xc18 +#define SC27XX_FGU_EN BIT(7) +#define SC27XX_FGU_RTC_EN BIT(6) + +/* FGU registers definition */ +#define SC27XX_FGU_START 0x0 +#define SC27XX_FGU_CONFIG 0x4 +#define SC27XX_FGU_ADC_CONFIG 0x8 +#define SC27XX_FGU_STATUS 0xc +#define SC27XX_FGU_INT_EN 0x10 +#define SC27XX_FGU_INT_CLR 0x14 +#define SC27XX_FGU_INT_STS 0x1c +#define SC27XX_FGU_VOLTAGE 0x20 +#define SC27XX_FGU_OCV 0x24 +#define SC27XX_FGU_POCV 0x28 +#define SC27XX_FGU_CURRENT 0x2c +#define SC27XX_FGU_CLBCNT_SETH 0x50 +#define SC27XX_FGU_CLBCNT_SETL 0x54 +#define SC27XX_FGU_CLBCNT_VALH 0x68 +#define SC27XX_FGU_CLBCNT_VALL 0x6c +#define SC27XX_FGU_CLBCNT_QMAXL 0x74 + +#define SC27XX_WRITE_SELCLB_EN BIT(0) +#define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0) +#define SC27XX_FGU_CLBCNT_SHIFT 16 + +#define SC27XX_FGU_1000MV_ADC 686 +#define SC27XX_FGU_1000MA_ADC 1372 +#define SC27XX_FGU_CUR_BASIC_ADC 8192 +#define SC27XX_FGU_SAMPLE_HZ 2 + +struct sc27xx_fgu_capacity_table { + int ocv; + int capacity; +}; + +/* + * struct sc27xx_fgu_data: describe the FGU device + * @regmap: regmap for register access + * @dev: platform device + * @battery: battery power supply + * @base: the base offset for the controller + * @lock: protect the structure + * @gpiod: GPIO for battery detection + * @channel: IIO channel to get battery temperature + * @inner_resist: the battery inner resistance in mOhm + * @total_cap: the total capacity of the battery in mAh + * @init_cap: the initial capacity of the battery in mAh + * @init_clbcnt: the initial coulomb counter + * @max_volt: the maximum constant input voltage in millivolt + * @table_len: the capacity table length + * @cap_table: capacity table with corresponding ocv + */ +struct sc27xx_fgu_data { + struct regmap *regmap; + struct device *dev; + struct power_supply *battery; + u32 base; + struct mutex lock; + struct gpio_desc *gpiod; + struct iio_channel *channel; + bool bat_present; + int inner_resist; + int total_cap; + int init_cap; + int init_clbcnt; + int max_volt; + int table_len; + struct sc27xx_fgu_capacity_table *cap_table; +}; + +static const char * const sc27xx_charger_supply_name[] = { + "sc2731_charger", + "sc2720_charger", + "sc2721_charger", + "sc2723_charger", +}; + +static int sc27xx_fgu_adc_to_current(int adc) +{ + return (adc * 1000) / SC27XX_FGU_1000MA_ADC; +} + +static int sc27xx_fgu_adc_to_voltage(int adc) +{ + return (adc * 1000) / SC27XX_FGU_1000MV_ADC; +} + +static int sc27xx_fgu_ocv_to_capacity(struct sc27xx_fgu_data *data, int ocv) +{ + struct sc27xx_fgu_capacity_table *tab = data->cap_table; + int n = data->table_len; + int i, cap, tmp; + + /* + * Find the position in the table for current battery OCV value, + * then use these two points to calculate battery capacity + * according to the linear method. + */ + for (i = 0; i < n; i++) + if (ocv > tab[i].ocv) + break; + + if (i > 0 && i < n) { + tmp = (tab[i - 1].capacity - tab[i].capacity) * + (ocv - tab[i].ocv) * 2; + tmp /= tab[i - 1].ocv - tab[i].ocv; + tmp = (tmp + 1) / 2; + cap = tmp + tab[i].capacity; + } else if (i == 0) { + cap = tab[0].capacity; + } else { + cap = tab[n - 1].capacity; + } + + return cap; +} + +/* + * When system boots on, we can not read battery capacity from coulomb + * registers, since now the coulomb registers are invalid. So we should + * calculate the battery open circuit voltage, and get current battery + * capacity according to the capacity table. + */ +static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap) +{ + int volt, cur, oci, ocv, ret; + + /* + * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved + * the first sampled open circuit current. + */ + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL, + &cur); + if (ret) + return ret; + + cur <<= 1; + oci = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); + + /* + * Should get the OCV from SC27XX_FGU_POCV register at the system + * beginning. It is ADC values reading from registers which need to + * convert the corresponding voltage. + */ + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt); + if (ret) + return ret; + + volt = sc27xx_fgu_adc_to_voltage(volt); + ocv = volt - (oci * data->inner_resist) / 1000; + + /* + * Parse the capacity table to look up the correct capacity percent + * according to current battery's corresponding OCV values. + */ + *cap = sc27xx_fgu_ocv_to_capacity(data, ocv); + + return 0; +} + +static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt) +{ + int ret; + + clbcnt *= SC27XX_FGU_SAMPLE_HZ; + + ret = regmap_update_bits(data->regmap, + data->base + SC27XX_FGU_CLBCNT_SETL, + SC27XX_FGU_CLBCNT_MASK, clbcnt); + if (ret) + return ret; + + ret = regmap_update_bits(data->regmap, + data->base + SC27XX_FGU_CLBCNT_SETH, + SC27XX_FGU_CLBCNT_MASK, + clbcnt >> SC27XX_FGU_CLBCNT_SHIFT); + if (ret) + return ret; + + return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START, + SC27XX_WRITE_SELCLB_EN, + SC27XX_WRITE_SELCLB_EN); +} + +static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt) +{ + int ccl, cch, ret; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL, + &ccl); + if (ret) + return ret; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH, + &cch); + if (ret) + return ret; + + *clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK; + *clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT; + *clb_cnt /= SC27XX_FGU_SAMPLE_HZ; + + return 0; +} + +static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap) +{ + int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp; + + /* Get current coulomb counters firstly */ + ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt); + if (ret) + return ret; + + delta_clbcnt = cur_clbcnt - data->init_clbcnt; + + /* + * Convert coulomb counter to delta capacity (mAh), and set multiplier + * as 100 to improve the precision. + */ + temp = DIV_ROUND_CLOSEST(delta_clbcnt, 360); + temp = sc27xx_fgu_adc_to_current(temp); + + /* + * Convert to capacity percent of the battery total capacity, + * and multiplier is 100 too. + */ + delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap); + *cap = delta_cap + data->init_cap; + + return 0; +} + +static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val) +{ + int ret, vol; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol); + if (ret) + return ret; + + /* + * It is ADC values reading from registers which need to convert to + * corresponding voltage values. + */ + *val = sc27xx_fgu_adc_to_voltage(vol); + + return 0; +} + +static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val) +{ + int ret, cur; + + ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur); + if (ret) + return ret; + + /* + * It is ADC values reading from registers which need to convert to + * corresponding current values. + */ + *val = sc27xx_fgu_adc_to_current(cur - SC27XX_FGU_CUR_BASIC_ADC); + + return 0; +} + +static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val) +{ + int vol, cur, ret; + + ret = sc27xx_fgu_get_vbat_vol(data, &vol); + if (ret) + return ret; + + ret = sc27xx_fgu_get_current(data, &cur); + if (ret) + return ret; + + *val = vol - (cur * data->inner_resist) / 1000; + + return 0; +} + +static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp) +{ + return iio_read_channel_processed(data->channel, temp); +} + +static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health) +{ + int ret, vol; + + ret = sc27xx_fgu_get_vbat_vol(data, &vol); + if (ret) + return ret; + + if (vol > data->max_volt) + *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else + *health = POWER_SUPPLY_HEALTH_GOOD; + + return 0; +} + +static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status) +{ + union power_supply_propval val; + struct power_supply *psy; + int i, ret = -EINVAL; + + for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) { + psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]); + if (!psy) + continue; + + ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, + &val); + power_supply_put(psy); + if (ret) + return ret; + + *status = val.intval; + } + + return ret; +} + +static int sc27xx_fgu_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); + int ret = 0; + int value; + + mutex_lock(&data->lock); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + ret = sc27xx_fgu_get_status(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_HEALTH: + ret = sc27xx_fgu_get_health(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_PRESENT: + val->intval = data->bat_present; + break; + + case POWER_SUPPLY_PROP_TEMP: + ret = sc27xx_fgu_get_temp(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; + break; + + case POWER_SUPPLY_PROP_CAPACITY: + ret = sc27xx_fgu_get_capacity(data, &value); + if (ret) + goto error; + + val->intval = value; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = sc27xx_fgu_get_vbat_vol(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_OCV: + ret = sc27xx_fgu_get_vbat_ocv(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + case POWER_SUPPLY_PROP_CURRENT_NOW: + case POWER_SUPPLY_PROP_CURRENT_AVG: + ret = sc27xx_fgu_get_current(data, &value); + if (ret) + goto error; + + val->intval = value * 1000; + break; + + default: + ret = -EINVAL; + break; + } + +error: + mutex_unlock(&data->lock); + return ret; +} + +static void sc27xx_fgu_external_power_changed(struct power_supply *psy) +{ + struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy); + + power_supply_changed(data->battery); +} + +static enum power_supply_property sc27xx_fgu_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_OCV, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CURRENT_AVG, +}; + +static const struct power_supply_desc sc27xx_fgu_desc = { + .name = "sc27xx-fgu", + .type = POWER_SUPPLY_TYPE_BATTERY, + .properties = sc27xx_fgu_props, + .num_properties = ARRAY_SIZE(sc27xx_fgu_props), + .get_property = sc27xx_fgu_get_property, + .external_power_changed = sc27xx_fgu_external_power_changed, +}; + +static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id) +{ + struct sc27xx_fgu_data *data = dev_id; + int state; + + mutex_lock(&data->lock); + + state = gpiod_get_value_cansleep(data->gpiod); + if (state < 0) { + dev_err(data->dev, "failed to get gpio state\n"); + mutex_unlock(&data->lock); + return IRQ_RETVAL(state); + } + + if (state) + data->bat_present = true; + else + data->bat_present = false; + + mutex_unlock(&data->lock); + + return IRQ_HANDLED; +} + +static void sc27xx_fgu_disable(void *_data) +{ + struct sc27xx_fgu_data *data = _data; + + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); +} + +static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity) +{ + /* + * Get current capacity (mAh) = battery total capacity (mAh) * + * current capacity percent (capacity / 100). + */ + int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100); + + /* + * Convert current capacity (mAh) to coulomb counter according to the + * formula: 1 mAh =3.6 coulomb. + */ + return DIV_ROUND_CLOSEST(cur_cap * 36, 10); +} + +static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data) +{ + struct power_supply_battery_info info = { }; + int ret; + + ret = power_supply_get_battery_info(data->battery, &info); + if (ret) { + dev_err(data->dev, "failed to get battery information\n"); + return ret; + } + + data->total_cap = info.charge_full_design_uah / 1000; + data->max_volt = info.constant_charge_voltage_max_uv / 1000; + + /* Enable the FGU module */ + ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, + SC27XX_FGU_EN, SC27XX_FGU_EN); + if (ret) { + dev_err(data->dev, "failed to enable fgu\n"); + return ret; + } + + /* Enable the FGU RTC clock to make it work */ + ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0, + SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN); + if (ret) { + dev_err(data->dev, "failed to enable fgu RTC clock\n"); + goto disable_fgu; + } + + /* + * Get the boot battery capacity when system powers on, which is used to + * initialize the coulomb counter. After that, we can read the coulomb + * counter to measure the battery capacity. + */ + ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap); + if (ret) { + dev_err(data->dev, "failed to get boot capacity\n"); + goto disable_clk; + } + + /* + * Convert battery capacity to the corresponding initial coulomb counter + * and set into coulomb counter registers. + */ + data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap); + ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt); + if (ret) { + dev_err(data->dev, "failed to initialize coulomb counter\n"); + goto disable_clk; + } + + return 0; + +disable_clk: + regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0); +disable_fgu: + regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0); + + return ret; +} + +static int sc27xx_fgu_parse_dt(struct sc27xx_fgu_data *data, + struct device_node *np) +{ + const __be32 *list; + int i, len, size, ret; + + ret = of_property_read_u32(np, "reg", &data->base); + if (ret) { + dev_err(data->dev, "failed to get fgu address\n"); + return ret; + } + + data->gpiod = devm_gpiod_get_optional(data->dev, "bat-detect", GPIOD_IN); + if (IS_ERR(data->gpiod)) { + dev_err(data->dev, "failed to get battery detection GPIO\n"); + return PTR_ERR(data->gpiod); + } + + data->channel = devm_iio_channel_get(data->dev, "bat-temp"); + if (IS_ERR(data->channel)) { + dev_err(data->dev, "failed to get IIO channel\n"); + return PTR_ERR(data->channel); + } + + /* Get the battery inner resistance */ + ret = of_property_read_u32(np, "sprd,inner-resist", &data->inner_resist); + if (ret) { + dev_err(data->dev, "failed to get battery inner resistance\n"); + return ret; + } + + /* Get battery ocv-capacity table */ + list = of_get_property(np, "sprd,ocv-cap-table", &size); + if (!list || !size) { + dev_err(data->dev, "failed to get ocv-capacity table\n"); + return -EINVAL; + } + + len = size / 8; + data->table_len = len; + data->cap_table = devm_kzalloc(data->dev, + sizeof(struct sc27xx_fgu_capacity_table) * len, + GFP_KERNEL); + if (!data->cap_table) + return -ENOMEM; + + for (i = 0; i < len; i++) { + data->cap_table[i].ocv = be32_to_cpu(*list++); + data->cap_table[i].capacity = be32_to_cpu(*list++); + } + + return 0; +} + +static int sc27xx_fgu_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct power_supply_config fgu_cfg = { }; + struct sc27xx_fgu_data *data; + int ret, irq; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!data->regmap) { + dev_err(&pdev->dev, "failed to get regmap\n"); + return -ENODEV; + } + + mutex_init(&data->lock); + data->dev = &pdev->dev; + data->bat_present = true; + + ret = sc27xx_fgu_parse_dt(data, np); + if (ret) + return ret; + + fgu_cfg.drv_data = data; + fgu_cfg.of_node = np; + data->battery = devm_power_supply_register(&pdev->dev, &sc27xx_fgu_desc, + &fgu_cfg); + if (IS_ERR(data->battery)) { + dev_err(&pdev->dev, "failed to register power supply\n"); + return PTR_ERR(data->battery); + } + + ret = sc27xx_fgu_hw_init(data); + if (ret) { + dev_err(&pdev->dev, "failed to initialize fgu hardware\n"); + return ret; + } + + ret = devm_add_action(&pdev->dev, sc27xx_fgu_disable, data); + if (ret) { + sc27xx_fgu_disable(data); + dev_err(&pdev->dev, "failed to add fgu disable action\n"); + return ret; + } + + irq = gpiod_to_irq(data->gpiod); + if (irq < 0) { + dev_err(&pdev->dev, "failed to translate GPIO to IRQ\n"); + return irq; + } + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + sc27xx_fgu_bat_detection, + IRQF_ONESHOT | IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING, + pdev->name, data); + if (ret) { + dev_err(&pdev->dev, "failed to request IRQ\n"); + return ret; + } + + return 0; +} + +static const struct of_device_id sc27xx_fgu_of_match[] = { + { .compatible = "sprd,sc2731-fgu", }, + { } +}; + +static struct platform_driver sc27xx_fgu_driver = { + .probe = sc27xx_fgu_probe, + .driver = { + .name = "sc27xx-fgu", + .of_match_table = sc27xx_fgu_of_match, + } +}; + +module_platform_driver(sc27xx_fgu_driver); + +MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver"); +MODULE_LICENSE("GPL v2");