From patchwork Thu Oct 31 12:22:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "(Exiting) Baolin Wang" X-Patchwork-Id: 11221147 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1BA9F112B for ; Thu, 31 Oct 2019 12:23:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ED1FD217D9 for ; Thu, 31 Oct 2019 12:23:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="a0/sfJRT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727443AbfJaMX6 (ORCPT ); Thu, 31 Oct 2019 08:23:58 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:39933 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727440AbfJaMX5 (ORCPT ); Thu, 31 Oct 2019 08:23:57 -0400 Received: by mail-pf1-f195.google.com with SMTP id x28so1054110pfo.6 for ; Thu, 31 Oct 2019 05:23:57 -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=3oVOdq8I07h/GCMR1jINzKAZkqhi2YtbfA6UhRaG+n8=; b=a0/sfJRTsmfaNdczbP/UocpLZeZWofQtNcy/OCkKLyPFEzM62I2i+2UIUeRohI2Pzh dJuAqpawZBwB5gf8KbLZvqBtZ66tXwq2oxP+j3mLWZj9WIvAfeeHLVRlv5iZRzYdIGY/ +BJkEgbFY56XdIUiDecypECQx/gY0Cw/rRF3Zk1aB6ci+f3XVrTAqSJbI/9gvnmt/0TW Y9N42pwj+OY+n4tYx/ZGe85ChkV3wNss7JpiczK4K3v54hwlYdHYduIzEo/qO/rURc8w tj1UPWzFILDZuc0MMFy/cm6aLQw95ceusZWQGBscvGtkPJgt+FVEIxblgYJ12ZkCJfQP vwtQ== 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=3oVOdq8I07h/GCMR1jINzKAZkqhi2YtbfA6UhRaG+n8=; b=ZTSQxiMYgjGR52Q6PsYxF8KeTzZ6O4q5ujytgVBn0u9fb3HRTz+oaOmxTlpRLIYgXG 8+nZA+QygUzFLpSudIuD1imOvBPT+OvHhAxmt9Ch1075pC4OD91IfrYnwEOdxYicwSzZ zhaqkp5Np0XiwKPrU5LbEZLKhumzITPFHPgOef5Dk90aYKbJst125Bc3Bc0w0QZ9Eapj Qb8HEt+nVHSg0gTFL80pkYyLA1sKzkpuRZffCi1df9ETAtFvojKrRkXmip9fRlJ3Yxu3 xoXYK+P+1e+4ejnaT0jm0iHYvHPlMVEvKqmFayMvzYcRDYb1pHvNg58gM53b9wjeiypf EKUg== X-Gm-Message-State: APjAAAUqBt80tbPCoWkQLbk8pUIKVOVa7Xgs1c3PDwR0TjG1WFAMlb0t AeFT3J00EQkf69iXnTRWJXOLKg== X-Google-Smtp-Source: APXvYqwRsBatPyRPC6H5u3bNXQ3d9fpGbW7bwKpnEtOkZpwtidHIsC1wSk8dAdf1LqVvm7kugUi34w== X-Received: by 2002:a63:6d8b:: with SMTP id i133mr6165132pgc.241.1572524636826; Thu, 31 Oct 2019 05:23:56 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id j25sm2983077pfi.113.2019.10.31.05.23.52 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 31 Oct 2019 05:23:55 -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, baolin.wang7@gmail.com, zhang.lyra@gmail.com, orsonzhai@gmail.com Subject: [PATCH v2 5/5] power: supply: sc27xx: Calibrate the resistance of coulomb counter Date: Thu, 31 Oct 2019 20:22:44 +0800 Message-Id: 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 There are some deviations between the real resistance and the ideal resistance of coulomb counter, which will affect the accuracy of the coulomb counter, thus calibrate the real resistance of coulomb counter to improve the accuracy. Signed-off-by: Baolin Wang --- drivers/power/supply/sc27xx_fuel_gauge.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/power/supply/sc27xx_fuel_gauge.c b/drivers/power/supply/sc27xx_fuel_gauge.c index 221b6fb..951d5d1 100644 --- a/drivers/power/supply/sc27xx_fuel_gauge.c +++ b/drivers/power/supply/sc27xx_fuel_gauge.c @@ -62,6 +62,8 @@ #define SC27XX_FGU_CUR_BASIC_ADC 8192 #define SC27XX_FGU_SAMPLE_HZ 2 +/* micro Ohms */ +#define SC27XX_FGU_IDEAL_RESISTANCE 20000 /* * struct sc27xx_fgu_data: describe the FGU device @@ -84,6 +86,7 @@ * @resist_table_len: the resistance table length * @cur_1000ma_adc: ADC value corresponding to 1000 mA * @vol_1000mv_adc: ADC value corresponding to 1000 mV + * @calib_resist: the real resistance of coulomb counter chip in mOhm * @cap_table: capacity table with corresponding ocv * @resist_table: resistance percent table with corresponding temperature */ @@ -108,6 +111,7 @@ struct sc27xx_fgu_data { int resist_table_len; int cur_1000ma_adc; int vol_1000mv_adc; + int calib_resist; struct power_supply_battery_ocv_table *cap_table; struct power_supply_resistance_temp_table *resist_table; }; @@ -900,7 +904,9 @@ static int sc27xx_fgu_calibration(struct sc27xx_fgu_data *data) */ cal_4200mv = (calib_data & 0x1ff) + 6963 - 4096 - 256; data->vol_1000mv_adc = DIV_ROUND_CLOSEST(cal_4200mv * 10, 42); - data->cur_1000ma_adc = data->vol_1000mv_adc * 4; + data->cur_1000ma_adc = + DIV_ROUND_CLOSEST(data->vol_1000mv_adc * 4 * data->calib_resist, + SC27XX_FGU_IDEAL_RESISTANCE); kfree(buf); return 0; @@ -1079,6 +1085,15 @@ static int sc27xx_fgu_probe(struct platform_device *pdev) return ret; } + ret = device_property_read_u32(&pdev->dev, + "sprd,calib-resistance-micro-ohms", + &data->calib_resist); + if (ret) { + dev_err(&pdev->dev, + "failed to get fgu calibration resistance\n"); + return ret; + } + data->channel = devm_iio_channel_get(dev, "bat-temp"); if (IS_ERR(data->channel)) { dev_err(dev, "failed to get IIO channel\n");