From patchwork Mon Oct 28 07:18:58 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: 11214691 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 2C5D3139A for ; Mon, 28 Oct 2019 07:20:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F3C27214AF for ; Mon, 28 Oct 2019 07:20:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="fm2GAqpv" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732535AbfJ1HUB (ORCPT ); Mon, 28 Oct 2019 03:20:01 -0400 Received: from mail-pl1-f196.google.com ([209.85.214.196]:43038 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732514AbfJ1HUA (ORCPT ); Mon, 28 Oct 2019 03:20:00 -0400 Received: by mail-pl1-f196.google.com with SMTP id v5so5143630ply.10 for ; Mon, 28 Oct 2019 00:19:58 -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=fm2GAqpvOV5+xOdAo3r0mmuXfnSQudliJYYK8fQmDxTzI5/A6qJcm4cFNtMt6kztOm LEZHSgqqIvCQzImsVgxaM52k5nBlExW9YWo98VQGVjqF2zzmrhFIgBsgconeYJH6Qo3C VOUk3K90fTM/4g9mYUqnSN3J9E/qTa4ERPQnuGuNs8WpJGU+wX7gRuHHnAuwqB+0XZ9u YFsSnfSzwhLA6UHhm24M9X1b3D1RELJx5tC2NgLdio/S+QPsiIfaaJKTaGFZklAVbZqk shg3n+kFoHcQ10KLL5GSbW9Xps5orYtPui3XQeo+GlHYFiS6PYd+0TGb8KMDMZeBbzr4 TzPQ== 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=Z1b+yNvaUWEU5RPiayf4h0FJlX9xSDNVGTMxrf9MQCTC9QRsWu67ssIuYwk05rwsOS lwEfYrElIw0pF+xr06MT55KyCEoWFvrdbgWWyesx8VRHN8375aMF4S/eyMY5wAPJTxmA eJF2M8nlRVXFlD93NEi5EQd/uzMQF17K/XzpzCbf/7AYqPxDterHj2vhyK4rrJzzrcxV aE0TsaX7F00YXxXsk3QvYeJD5ro/p7QubMXQe4AMko/e1SODOAjxSG5dCvYvSfJmSInZ +lvKjxmV7bsj6LdavMOb8i40GvZrCCSkK7Rhj/tANJYEy6AaXfkJyBSC4ApDst5eOGYI JIQA== X-Gm-Message-State: APjAAAVImTK7MCNPTXDPqwCe9vgLX2osAIRE2wVzd52TbMJivMvig1D3 6WOBd57e+KYti72zO1gXPy3xtQ== X-Google-Smtp-Source: APXvYqxGyPewV02f8pGwk38cG8wUAibrorZUIjhlZRWTqatHMYUo9fDPeptlwz4JNB+aK8blKxxnjg== X-Received: by 2002:a17:902:8b83:: with SMTP id ay3mr17436518plb.269.1572247198266; Mon, 28 Oct 2019 00:19:58 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id 13sm11504703pgq.72.2019.10.28.00.19.54 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 28 Oct 2019 00:19:57 -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 2/5] power: supply: core: Add battery internal resistance temperature table support Date: Mon, 28 Oct 2019 15:18:58 +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(