From patchwork Thu Oct 31 12:22:41 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: 11221145 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 7F32A1599 for ; Thu, 31 Oct 2019 12:23:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 52429208E3 for ; Thu, 31 Oct 2019 12:23:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="cLIQcH9d" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727319AbfJaMXp (ORCPT ); Thu, 31 Oct 2019 08:23:45 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:34895 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726687AbfJaMXp (ORCPT ); Thu, 31 Oct 2019 08:23:45 -0400 Received: by mail-pg1-f193.google.com with SMTP id c8so3974008pgb.2 for ; Thu, 31 Oct 2019 05:23:45 -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=zQKRY2XE5oS+mi6BE44agpH5JNOXqmvzvanMV9EmHYs=; b=cLIQcH9d9VBOuW5eg1WEB5cH12kHdtw3tpLXDCqui+gGLI2o+7YmxJeMpr3bTTID22 OxrVgLn7lpnpBFmynNLHesa80WLHSG1l1PQOM92u6713UOvNwXflkXZNdNY4MS2WMztn 5QvPoMfZiu9X5Kwdqy4XwZKlycdtyH3cLehgxbzfTn4P9qeLqQ60qm8/vRDXUNfi5oU6 J9fN2TF2DbSg1+UCZu3XGYnYUhlbE7r6+qHwvv+UtvcO92CHjzbwqmmzSc4MhwgKFwoY wCVaTSmQIfpf8AivSJE+7TFrbb/Qe3bg2EbtvphPWKjHzBOjKLO0MPfGhElq9/Y0VcFX Ax4g== 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=zQKRY2XE5oS+mi6BE44agpH5JNOXqmvzvanMV9EmHYs=; b=YuDK+PADgz53WuXlGBlYJDypvVFFPhtshn2WG/w3O+qkkJd18bLd8TVdd96RI4byVV AjKa83dnXVO+hruFdtcCUs/BbRVJ1B+vSx+nvW7y+l07MqJODjOyAYep4OVJFyyRb5YP R2G0kXYnlSHGkJsthHSb7brxwpdKxPDKhr/Q3CQUt+RcppD4lxzuc9vHjZJWwNT/e1b0 m3M3/Lx4KtOxrFWcTcQfqOuy2X/cQ3b+irjhm++4igyFngOpkVZYkXbMHEr0h43RM4WK I8Pp9ME4KGnHBc63YSytMdSi1iRax3FOb6ED+wIIEvfKN1qZYFhVnOMKBwKNo6Z+cg7q rBNw== X-Gm-Message-State: APjAAAV15LbL67PLr5gU8TfG4Kwh9vbuV318zF3/u8vXPIOvAc2/AgqN dpi3VjP7egOiRxsBzR57a1R2fA== X-Google-Smtp-Source: APXvYqz4LtpsmNhxAR8BEP3jfQN9Zi/GoqBPCUEwXEOGFoUFUvabW6mN4F67lmRMZ3lE0g99zgH2oA== X-Received: by 2002:a17:90a:9293:: with SMTP id n19mr6915757pjo.67.1572524624617; Thu, 31 Oct 2019 05:23:44 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id j25sm2983077pfi.113.2019.10.31.05.23.40 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 31 Oct 2019 05:23:43 -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 2/5] power: supply: core: Add battery internal resistance temperature table support Date: Thu, 31 Oct 2019 20:22:41 +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 Since the battery internal resistance can be changed with the temperature changes, thus add a resistance temperature table support to look up the accurate battery internal resistance in a certain temperature. Signed-off-by: Baolin Wang --- drivers/power/supply/power_supply_core.c | 67 +++++++++++++++++++++++++++++- include/linux/power_supply.h | 10 +++++ 2 files changed, 76 insertions(+), 1 deletion(-) diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c index 5c36c43..1a9a9fa 100644 --- a/drivers/power/supply/power_supply_core.c +++ b/drivers/power/supply/power_supply_core.c @@ -565,9 +565,11 @@ struct power_supply *devm_power_supply_get_by_phandle(struct device *dev, int power_supply_get_battery_info(struct power_supply *psy, struct power_supply_battery_info *info) { + struct power_supply_resistance_temp_table *resist_table; struct device_node *battery_np; const char *value; int err, len, index; + const __be32 *list; info->energy_full_design_uwh = -EINVAL; info->charge_full_design_uah = -EINVAL; @@ -578,6 +580,7 @@ int power_supply_get_battery_info(struct power_supply *psy, info->constant_charge_current_max_ua = -EINVAL; info->constant_charge_voltage_max_uv = -EINVAL; info->factory_internal_resistance_uohm = -EINVAL; + info->resist_table = NULL; for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) { info->ocv_table[index] = NULL; @@ -644,7 +647,6 @@ int power_supply_get_battery_info(struct power_supply *psy, for (index = 0; index < len; index++) { struct power_supply_battery_ocv_table *table; char *propname; - const __be32 *list; int i, tab_len, size; propname = kasprintf(GFP_KERNEL, "ocv-capacity-table-%d", index); @@ -677,6 +679,26 @@ int power_supply_get_battery_info(struct power_supply *psy, } } + list = of_get_property(battery_np, "resistance-temp-table", &len); + if (!list || !len) + goto out_put_node; + + info->resist_table_size = len / (2 * sizeof(__be32)); + resist_table = info->resist_table = devm_kcalloc(&psy->dev, + info->resist_table_size, + sizeof(*resist_table), + GFP_KERNEL); + if (!info->resist_table) { + power_supply_put_battery_info(psy, info); + err = -ENOMEM; + goto out_put_node; + } + + for (index = 0; index < info->resist_table_size; index++) { + resist_table[index].temp = be32_to_cpu(*list++); + resist_table[index].resistance = be32_to_cpu(*list++); + } + out_put_node: of_node_put(battery_np); return err; @@ -692,10 +714,53 @@ void power_supply_put_battery_info(struct power_supply *psy, if (info->ocv_table[i]) devm_kfree(&psy->dev, info->ocv_table[i]); } + + if (info->resist_table) + devm_kfree(&psy->dev, info->resist_table); } EXPORT_SYMBOL_GPL(power_supply_put_battery_info); /** + * power_supply_temp2resist_simple() - find the battery internal resistance + * percent + * @table: Pointer to battery resistance temperature table + * @table_len: The table length + * @ocv: Current temperature + * + * This helper function is used to look up battery internal resistance percent + * according to current temperature value from the resistance temperature table, + * and the table must be ordered descending. Then the actual battery internal + * resistance = the ideal battery internal resistance * percent / 100. + * + * Return: the battery internal resistance percent + */ +int power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table, + int table_len, int temp) +{ + int i, resist; + + for (i = 0; i < table_len; i++) + if (temp > table[i].temp) + break; + + if (i > 0 && i < table_len) { + int tmp; + + tmp = (table[i - 1].resistance - table[i].resistance) * + (temp - table[i].temp); + tmp /= table[i - 1].temp - table[i].temp; + resist = tmp + table[i].resistance; + } else if (i == 0) { + resist = table[0].resistance; + } else { + resist = table[table_len - 1].resistance; + } + + return resist; +} +EXPORT_SYMBOL_GPL(power_supply_temp2resist_simple); + +/** * power_supply_ocv2cap_simple() - find the battery capacity * @table: Pointer to battery OCV lookup table * @table_len: OCV table length diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index 28413f7..dcd5a71 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -325,6 +325,11 @@ struct power_supply_battery_ocv_table { int capacity; /* percent */ }; +struct power_supply_resistance_temp_table { + int temp; /* celsius */ + int resistance; /* internal resistance percent */ +}; + #define POWER_SUPPLY_OCV_TEMP_MAX 20 /* @@ -349,6 +354,8 @@ struct power_supply_battery_info { int ocv_temp[POWER_SUPPLY_OCV_TEMP_MAX];/* celsius */ struct power_supply_battery_ocv_table *ocv_table[POWER_SUPPLY_OCV_TEMP_MAX]; int ocv_table_size[POWER_SUPPLY_OCV_TEMP_MAX]; + struct power_supply_resistance_temp_table *resist_table; + int resist_table_size; }; extern struct atomic_notifier_head power_supply_notifier; @@ -381,6 +388,9 @@ extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *ta int temp, int *table_len); extern int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info, int ocv, int temp); +extern int +power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table, + int table_len, int temp); extern void power_supply_changed(struct power_supply *psy); extern int power_supply_am_i_supplied(struct power_supply *psy); extern int power_supply_set_input_current_limit_from_supplier(