From patchwork Thu Sep 27 07:26:54 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: 147680 Delivered-To: patch@linaro.org Received: by 2002:a2e:8595:0:0:0:0:0 with SMTP id b21-v6csp1653306lji; Thu, 27 Sep 2018 00:27:51 -0700 (PDT) X-Google-Smtp-Source: ACcGV62fTHpW0um0Vu/07PNyvspiYhBxA3P9E4kFBiZtUwRYRvMq0i/Mk1sLXD0eLS2pISAgcyG5 X-Received: by 2002:a62:e511:: with SMTP id n17-v6mr9833743pff.210.1538033271319; Thu, 27 Sep 2018 00:27:51 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1538033271; cv=none; d=google.com; s=arc-20160816; b=qKMlsIEomy9lW1yZk/cppCkukLY2nHEIHGuBGr0W5pPcOPOwNejy2mH6MCMxVMYRY9 B9eKV9KNk/mNyYAeisVzHlOHVaIro4MF8HsT4lDLm8K4BpJOZAQfWhfS7Vpo0TyG7qTL VoZJrI9RcpmoqgvVu1u0fYjwZcZC3z4G3xBw4geWOmMTG8FT/T1422x2TCcPm+PVst0W 5y27bvjO5DSrtnwakjbSGl1P9ODrghGhGiOY2k4jGTzkTs72neC6Nk5GhWqAMTfazL7Q YlGWA+Nwu1yiqHxWzzubLrC0NPw+HZ92mLPaL7eKwykX9betyj44JCiY8PiGrjUCOL8Q qfXw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:date:subject:cc:to:from :dkim-signature; bh=4VmbNGK4/Krdl0b5VErXgThoZu7vAXm7F8ofWNw+h+Y=; b=0d8ubOPRhFEH6XMGWTNPUJwP0JuEzECGemlYMbOwAOJNmVCm57eqdSwekY9zDdRUFr FSteKD5tih9GrqwK5N5ZaBvbQhVQyg6z4zGQDdmmPl3dhyslaPf/mnOCjTFX3Yd3v7cr U+H40fWQMfph96N6tGxcr0wDIsJatrsiqxZTEWFI8RDklFE8/U03Bt6wruVmGRSHD8Z6 1cOtug69u2//WIT5ABUC3DqfH8QqFXClFKiixFLVey+kidRQp184w+aT7vty+ts54Ls1 rirlAonzvhAwCi+lTZYJWRyJqwSk3lDOB02p5jm42otWh3/YrHMGc9qGP4ApnMzZ0YMO niRQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=GBXWaozF; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id i126-v6si1300620pgd.332.2018.09.27.00.27.51; Thu, 27 Sep 2018 00:27:51 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=GBXWaozF; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726953AbeI0Nol (ORCPT + 6 others); Thu, 27 Sep 2018 09:44:41 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:37954 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726948AbeI0Nok (ORCPT ); Thu, 27 Sep 2018 09:44:40 -0400 Received: by mail-pg1-f193.google.com with SMTP id r77-v6so1267587pgr.5 for ; Thu, 27 Sep 2018 00:27:49 -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=4VmbNGK4/Krdl0b5VErXgThoZu7vAXm7F8ofWNw+h+Y=; b=GBXWaozFl12GA1q1cUTlGwVVR+P0Bb8rD8e8VxrtYN36gA3qiFLOgYiO/JVNs2yMPI riJ4mt5JHP2UxRFqFGo2rJSzUkvbsTO3aL0VTLwbm1NPFGoWANNv6aVH+bvGFtwhtcDp nUVEh8RdqvoBYUYA/KEC7suEcSxCJdyevAYnc= 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=4VmbNGK4/Krdl0b5VErXgThoZu7vAXm7F8ofWNw+h+Y=; b=PhAL8Xf2ogEk2q+g0fAIX7MhrZC/kfPahn53YVzShPHRMrQlyBcvzhLII/s4VIfRNR zL4CY+eIXP6YNMWNT6nyl1wem7ddaDwd1zp2NWm3ibrfO1QBWrRSwhmut1YMkdJrtVlQ 7TmwG3a05LpyQDnOwqqA7nBBvB+3JU/G1f8T93ZP8FZq5aYK1Xq8ZHfA7qkAmIB3mj1y PdfV/8mscEOZUkPtqyum9lWwwTyIA3kP0RjrCCDgLVZGj9pT2faqu8dEDg6VLBJZQeHv Nj61UhtY67VHDRGC5XqJpcDBvcbHtJHWSmgLbTOEdexrJjEDJa+o7FUMY1exAAASl/nG HfEw== X-Gm-Message-State: ABuFfohIiaJVhjZsGaYDWDfAkF4iw+MwHDLRbgWr72q7/8EsLNlLWtpj 2Jz0wyQHdbcaj2kIbfjPdw/Vpg== X-Received: by 2002:a62:7788:: with SMTP id s130-v6mr9859304pfc.189.1538033269467; Thu, 27 Sep 2018 00:27:49 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id h12-v6sm1835018pfo.135.2018.09.27.00.27.44 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 27 Sep 2018 00:27:48 -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, ctatlor97@gmail.com, linus.walleij@linaro.org Subject: [PATCH v3 1/4] power: supply: core: Introduce one property to present the battery internal resistance Date: Thu, 27 Sep 2018 15:26:54 +0800 Message-Id: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The internal resistance of a battery is not a constant in its life cycle, this varies over the age of the battery or temperature and so on. But we just want use one constant battery internal resistance to estimate the battery capacity. Thus this patch introduces one property to present the battery factory internal resistance for battery information. Signed-off-by: Baolin Wang --- Changes from v2: - Rename the property. - Improve the commit message. Changes from v1: - New patch in v2. --- .../devicetree/bindings/power/supply/battery.txt | 2 ++ drivers/power/supply/power_supply_core.c | 3 +++ include/linux/power_supply.h | 1 + 3 files changed, 6 insertions(+) -- 1.7.9.5 diff --git a/Documentation/devicetree/bindings/power/supply/battery.txt b/Documentation/devicetree/bindings/power/supply/battery.txt index f4d3b4a..938d027 100644 --- a/Documentation/devicetree/bindings/power/supply/battery.txt +++ b/Documentation/devicetree/bindings/power/supply/battery.txt @@ -22,6 +22,7 @@ Optional Properties: - charge-term-current-microamp: current for charge termination phase - constant-charge-current-max-microamp: maximum constant input current - constant-charge-voltage-max-microvolt: maximum constant input voltage + - factory-internal-resistance-micro-ohms: battery factory internal resistance Battery properties are named, where possible, for the corresponding elements in enum power_supply_property, defined in @@ -42,6 +43,7 @@ Example: charge-term-current-microamp = <128000>; constant-charge-current-max-microamp = <900000>; constant-charge-voltage-max-microvolt = <4200000>; + factory-internal-resistance-micro-ohms = <250000>; }; charger: charger@11 { diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c index e853618..307e0995 100644 --- a/drivers/power/supply/power_supply_core.c +++ b/drivers/power/supply/power_supply_core.c @@ -579,6 +579,7 @@ int power_supply_get_battery_info(struct power_supply *psy, info->charge_term_current_ua = -EINVAL; info->constant_charge_current_max_ua = -EINVAL; info->constant_charge_voltage_max_uv = -EINVAL; + info->factory_internal_resistance_uohm = -EINVAL; if (!psy->of_node) { dev_warn(&psy->dev, "%s currently only supports devicetree\n", @@ -616,6 +617,8 @@ int power_supply_get_battery_info(struct power_supply *psy, &info->constant_charge_current_max_ua); of_property_read_u32(battery_np, "constant_charge_voltage_max_microvolt", &info->constant_charge_voltage_max_uv); + of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms", + &info->factory_internal_resistance_uohm); return 0; } diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index f807691..d089566 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -326,6 +326,7 @@ struct power_supply_battery_info { int charge_term_current_ua; /* microAmps */ int constant_charge_current_max_ua; /* microAmps */ int constant_charge_voltage_max_uv; /* microVolts */ + int factory_internal_resistance_uohm; /* microOhms */ }; extern struct atomic_notifier_head power_supply_notifier; From patchwork Thu Sep 27 07:26:55 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: 147681 Delivered-To: patch@linaro.org Received: by 2002:a2e:8595:0:0:0:0:0 with SMTP id b21-v6csp1653394lji; Thu, 27 Sep 2018 00:27:57 -0700 (PDT) X-Google-Smtp-Source: ACcGV60VZENSz8AZZ+67To9OZHXzsaFSQpHdJRRxsmXvRbsOSurfUNMAYFPDEhqWpp4ksMai7imL X-Received: by 2002:a17:902:720b:: with SMTP id ba11-v6mr9410847plb.199.1538033277309; Thu, 27 Sep 2018 00:27:57 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1538033277; cv=none; d=google.com; s=arc-20160816; b=cxUow+IFz5+Mvu7euQjrLI5V80D+tQVyxyT7mVrY+kKvfxFoMRihrZ/IT0Uq8CR+J7 NDIK4vy4XrH0mamqkAac4n02IiHlzFpDubh6UEhVZ95TcrzllpGfK46lnCGDybM/gPVn CP+qd7C4tW3bxrG7hm5tcsdkc82zPHaVOXQz4bwESIW4DnOibTUYSr9eKIquBHxQ8qHi vtveGJQPgbS1nyxUkHg4e/hfdXGMAZFANO7dl+MuikWuDFtZLVYHiicYyRufzOh7SOqR ijkGZDU6T1gEFNYgXkkiimxizRPHvc+Tqx0jiv2zdNhXLGw+imQtYHo1fiBtFPdKpVLJ +yMg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:references :in-reply-to:message-id:date:subject:cc:to:from:dkim-signature; bh=MKTJF5NsssoWjmjdLTmPozCalJms9vgpeT61g4PW+qo=; b=mY3dP1yDPL4RKVWCTOFJzwyNDOLYHrpw1loLiYPOddXvZ42s59aS2ca30sowUw9Tjf 7mXcXneCrcJT2Iz4+m5vx5jn9ur1BNVMW+2f9TfaMf9zT1LbvPWa7JeNj+gRFoPioGr5 /LorFJfg759K63DDIzbGHVPXdWuDymK+AS/1d3fGa5xnBu9MzP2CqqRPEAqarZ1XyzbY SSzc74BL3gSwS8HHZ3OgOCwUU93aUHSHOLRZkjiYw1vqTr22BpI24n0OFESSX1KxvhNe Zbgw1FAqP86D2Exgf/CCnIjbWh1zham0S4QAUnYJYzxETbBC2XA9ulBePTdFn0EF9n1e URxg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=TwLrJ0KF; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id a6-v6si1358588pln.78.2018.09.27.00.27.57; Thu, 27 Sep 2018 00:27:57 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=TwLrJ0KF; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726952AbeI0Noq (ORCPT + 6 others); Thu, 27 Sep 2018 09:44:46 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:39414 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727131AbeI0Noq (ORCPT ); Thu, 27 Sep 2018 09:44:46 -0400 Received: by mail-pg1-f195.google.com with SMTP id 85-v6so1265161pge.6 for ; Thu, 27 Sep 2018 00:27:55 -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=MKTJF5NsssoWjmjdLTmPozCalJms9vgpeT61g4PW+qo=; b=TwLrJ0KF8B128xtcSM9ysLHWVidRWPbe1vwZboTwrJokhsKWZc6zrL3Zo41Z23iZbO 1WQpo9AxyFzICIbU4ys/9RH3BqcZZzbjg+OO+69sPGa+/f8eN37DKVuPZ5tpAoYuzAd8 c0X1k6/c9ERvYGNUlyKxNGmkEh/gNm79N8PoE= 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=MKTJF5NsssoWjmjdLTmPozCalJms9vgpeT61g4PW+qo=; b=SRPmZV56bkOMAw41yY0tQsKYkuoDxm/pHaRUQItxfCyLQZ3RSpNHFE40sGQCjt6wdq cxArF4yUPK0AQgydvZ6BNHQU77YjwsL8dDuMRTq4Nvs1ynFE8eEcaposSy03mO7a2rO6 fo+wz2+/k6fuVm81p6NcTNz2WaNffAE3nbntJruKPlpmFDEoZ36EtHoabGjqE8j9hVkH cxFhPUwK96b2/NHfcZBY3U2RDZB/1/6RqjGjb4n0Msy6Peq0WHqdl+ZJiiRWw1B+WA1C zVPj+l9q/mlVlIDOYBn1SDu01jNDCPXlBvh+6dreKgpTN5uQoxJCG7iFi1uytA7mUxfq 7XkQ== X-Gm-Message-State: ABuFfohA5b8HWXCQqwQc0F7E7/KCRbLC9U1n3IA+jlRV3FL7yesz4NJ3 8znCs4+xOQu3F/nZZdiNdgdP9g== X-Received: by 2002:a63:7744:: with SMTP id s65-v6mr8919317pgc.197.1538033274695; Thu, 27 Sep 2018 00:27:54 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id h12-v6sm1835018pfo.135.2018.09.27.00.27.49 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 27 Sep 2018 00:27:53 -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, ctatlor97@gmail.com, linus.walleij@linaro.org Subject: [PATCH v3 2/4] power: supply: core: Introduce properties to present the battery OCV capacity table Date: Thu, 27 Sep 2018 15:26:55 +0800 Message-Id: <7dccec1694a05a524710e59a63859974b4cdae89.1538033078.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> References: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> In-Reply-To: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> References: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Some battery driver will use the open circuit voltage (OCV) value to look up the corresponding battery capacity percent in one certain degree Celsius. Thus this patch provides some battery properties to present the OCV table temperatures and OCV capacity table values. Moreover it also provides some helper functions to use the OCV capacity table for users. Suggested-by: Sebastian Reichel Signed-off-by: Baolin Wang Reviewed-by: Linus Walleij --- Changes from v2: - Use type __be32 to calculate the table length. - Update error messages. - Add some helper functions. Changes from v1: - New patch in v2. --- .../devicetree/bindings/power/supply/battery.txt | 14 +++ drivers/power/supply/power_supply_core.c | 125 +++++++++++++++++++- include/linux/power_supply.h | 19 +++ 3 files changed, 157 insertions(+), 1 deletion(-) -- 1.7.9.5 diff --git a/Documentation/devicetree/bindings/power/supply/battery.txt b/Documentation/devicetree/bindings/power/supply/battery.txt index 938d027..cad38df 100644 --- a/Documentation/devicetree/bindings/power/supply/battery.txt +++ b/Documentation/devicetree/bindings/power/supply/battery.txt @@ -23,6 +23,16 @@ Optional Properties: - constant-charge-current-max-microamp: maximum constant input current - constant-charge-voltage-max-microvolt: maximum constant input voltage - factory-internal-resistance-micro-ohms: battery factory internal resistance + - ocv-capacity-table-0: An array providing the battery capacity percent + with corresponding open circuit voltage (OCV) of the battery, which + is used to look up battery capacity according to current OCV value. + - ocv-capacity-table-1: Same as ocv-capacity-table-0 + ...... + - ocv-capacity-table-n: Same as ocv-capacity-table-0 + - ocv-capacity-table-temperatures: An array containing the temperature + in degree Celsius, for each of the battery capacity lookup table. + The first temperature value specifies the OCV table 0, and the second + temperature value specifies the OCV table 1, and so on. Battery properties are named, where possible, for the corresponding elements in enum power_supply_property, defined in @@ -44,6 +54,10 @@ Example: constant-charge-current-max-microamp = <900000>; constant-charge-voltage-max-microvolt = <4200000>; factory-internal-resistance-micro-ohms = <250000>; + ocv-capacity-table-temperatures = <(-10) 0 10>; + ocv-capacity-table-0 = <4185000 100>, <4113000 95>, <4066000 90>, ...; + ocv-capacity-table-1 = <4200000 100>, <4185000 95>, <4113000 90>, ...; + ocv-capacity-table-2 = <4250000 100>, <4200000 95>, <4185000 90>, ...; }; charger: charger@11 { diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c index 307e0995..7b7267c 100644 --- a/drivers/power/supply/power_supply_core.c +++ b/drivers/power/supply/power_supply_core.c @@ -570,7 +570,7 @@ int power_supply_get_battery_info(struct power_supply *psy, { struct device_node *battery_np; const char *value; - int err; + int err, len, index; info->energy_full_design_uwh = -EINVAL; info->charge_full_design_uah = -EINVAL; @@ -581,6 +581,12 @@ int power_supply_get_battery_info(struct power_supply *psy, info->constant_charge_voltage_max_uv = -EINVAL; info->factory_internal_resistance_uohm = -EINVAL; + for (index = 0; index < POWER_SUPPLY_OCV_TEMP_MAX; index++) { + info->ocv_table[index] = NULL; + info->ocv_temp[index] = -EINVAL; + info->ocv_table_size[index] = -EINVAL; + } + if (!psy->of_node) { dev_warn(&psy->dev, "%s currently only supports devicetree\n", __func__); @@ -620,10 +626,127 @@ int power_supply_get_battery_info(struct power_supply *psy, of_property_read_u32(battery_np, "factory-internal-resistance-micro-ohms", &info->factory_internal_resistance_uohm); + len = of_property_count_u32_elems(battery_np, + "ocv-capacity-table-temperatures"); + if (len < 0 && len != -EINVAL) { + return len; + } else if (len > POWER_SUPPLY_OCV_TEMP_MAX) { + dev_err(&psy->dev, "Too many temperature values\n"); + return -EINVAL; + } else if (len > 0) { + of_property_read_u32_array(battery_np, + "ocv-capacity-table-temperatures", + info->ocv_temp, len); + } + + 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); + list = of_get_property(battery_np, propname, &size); + if (!list || !size) { + dev_err(&psy->dev, "failed to get %s\n", propname); + kfree(propname); + power_supply_put_battery_info(psy, info); + return -EINVAL; + } + + kfree(propname); + tab_len = size / (2 * sizeof(__be32)); + info->ocv_table_size[index] = tab_len; + + table = info->ocv_table[index] = + devm_kzalloc(&psy->dev, tab_len * sizeof(*table), + GFP_KERNEL); + if (!info->ocv_table[index]) { + power_supply_put_battery_info(psy, info); + return -ENOMEM; + } + + for (i = 0; i < tab_len; i++) { + table[i].ocv = be32_to_cpu(*list++); + table[i].capacity = be32_to_cpu(*list++); + } + } + return 0; } EXPORT_SYMBOL_GPL(power_supply_get_battery_info); +void power_supply_put_battery_info(struct power_supply *psy, + struct power_supply_battery_info *info) +{ + int i; + + for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) + kfree(info->ocv_table[i]); +} +EXPORT_SYMBOL_GPL(power_supply_put_battery_info); + +int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table, + int table_len, int ocv) +{ + int i, cap, tmp; + + for (i = 0; i < table_len; i++) + if (ocv > table[i].ocv) + break; + + if (i > 0 && i < table_len) { + tmp = (table[i - 1].capacity - table[i].capacity) * + (ocv - table[i].ocv); + tmp /= table[i - 1].ocv - table[i].ocv; + cap = tmp + table[i].capacity; + } else if (i == 0) { + cap = table[0].capacity; + } else { + cap = table[table_len - 1].capacity; + } + + return cap; +} +EXPORT_SYMBOL_GPL(power_supply_ocv2cap_simple); + +struct power_supply_battery_ocv_table * +power_supply_find_ocv2cap_table(struct power_supply_battery_info *info, + int temp, int *table_len) +{ + int best_temp_diff = INT_MAX, best_index = 0, temp_diff, i; + + if (!info->ocv_table[0]) + return NULL; + + for (i = 0; i < POWER_SUPPLY_OCV_TEMP_MAX; i++) { + temp_diff = abs(info->ocv_temp[i] - temp); + + if (temp_diff < best_temp_diff) { + best_temp_diff = temp_diff; + best_index = i; + } + } + + *table_len = info->ocv_table_size[best_index]; + return info->ocv_table[best_index]; +} +EXPORT_SYMBOL_GPL(power_supply_find_ocv2cap_table); + +int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info, + int ocv, int temp) +{ + struct power_supply_battery_ocv_table *table; + int table_len; + + table = power_supply_find_ocv2cap_table(info, temp, &table_len); + if (!table) + return -EINVAL; + + return power_supply_ocv2cap_simple(table, table_len, ocv); +} +EXPORT_SYMBOL_GPL(power_supply_batinfo_ocv2cap); + int power_supply_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index d089566..84fe93f 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -309,6 +309,13 @@ struct power_supply_info { int use_for_apm; }; +struct power_supply_battery_ocv_table { + int ocv; /* microVolts */ + int capacity; /* percent */ +}; + +#define POWER_SUPPLY_OCV_TEMP_MAX 20 + /* * This is the recommended struct to manage static battery parameters, * populated by power_supply_get_battery_info(). Most platform drivers should @@ -327,6 +334,9 @@ struct power_supply_battery_info { int constant_charge_current_max_ua; /* microAmps */ int constant_charge_voltage_max_uv; /* microVolts */ int factory_internal_resistance_uohm; /* microOhms */ + 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]; }; extern struct atomic_notifier_head power_supply_notifier; @@ -350,6 +360,15 @@ extern struct power_supply *devm_power_supply_get_by_phandle( extern int power_supply_get_battery_info(struct power_supply *psy, struct power_supply_battery_info *info); +extern void power_supply_put_battery_info(struct power_supply *psy, + struct power_supply_battery_info *info); +extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table, + int table_len, int ocv); +extern struct power_supply_battery_ocv_table * +power_supply_find_ocv2cap_table(struct power_supply_battery_info *info, + int temp, int *table_len); +extern int power_supply_batinfo_ocv2cap(struct power_supply_battery_info *info, + int ocv, 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( From patchwork Thu Sep 27 07:26:57 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: 147683 Delivered-To: patch@linaro.org Received: by 2002:a2e:8595:0:0:0:0:0 with SMTP id b21-v6csp1653519lji; Thu, 27 Sep 2018 00:28:07 -0700 (PDT) X-Google-Smtp-Source: ACcGV60AGsle4JYjjOLKhbCc11cxmdLmj7HyZomXj75YnT2EEr3O+v8PXKYLjlA+LvZgT5BxmMJT X-Received: by 2002:a17:902:c6b:: with SMTP id 98-v6mr9584915pls.233.1538033287147; Thu, 27 Sep 2018 00:28:07 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1538033287; cv=none; d=google.com; s=arc-20160816; b=VMbXWQLGGXHuaIh+ldUl3KawIxt3yvqd/nWcCBxQ51jVWsyOp3nFtX3ipqgwR4y69x R4rUzXif/1N6QWaDRp62vEb6CgABCpTW1NArcrhgVjmIRTx8IdI7THMiuTbpcgCZ7Gn3 QiX9YJMBU67aqltj672ynHetsIe07EIh3S4jIdV1WjnJanABBil6HY84UlmBsrtA8X/N 9EfuzzY2GAZW5B0Z3EWMs41w34+S5PSYJe4TU4KSIzojnaTvFepe9m8xNGj0p7gce7my c+Zu3NtDn+F1tNJvzCSzMviUuKcDV+5YCjh9sZzynW1CQzAUGi9e7MTsoMV+aHlQ9oEn /6tw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:references :in-reply-to:message-id:date:subject:cc:to:from:dkim-signature; bh=x/bf2B1O28GlgKGBsL6ZOOMbTs1zvo6PdwDnoQ9v8SI=; b=gPaUPRa9RyJNxPT6WlzMbknGPd71NDi//8yMWxuonHNY8eRDqsM/QpD7TgqwABwdyN l2GhqPmS091C17NHMukpaVOcf/KOgnBgC5oJiJ/8Ce/GuvadB0CVQYoKv/8EpLy4bTIy S9Ae4mP36wr3QO3ybqQ7ydE7mrdHrbTonJf95dEyOQ8yIhJDEv9ztF6fAcgWQTJSt0xj MdvZgKjjJbln0VCdsKnWd/40ny2tQh4InxzPdj65HLUpYTFX7T3+lBgAV7QPfUIdXNGh Y+qvBwiz0yb3+j4VW5xuB4GYFJl4jyxiGseemGg2Bmi+i6/nqiIXn4g+3sBfrphRO8q+ rgSg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=P21zi9Sr; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 64-v6si1282496plk.257.2018.09.27.00.28.06; Thu, 27 Sep 2018 00:28:07 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=P21zi9Sr; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727303AbeI0No4 (ORCPT + 6 others); Thu, 27 Sep 2018 09:44:56 -0400 Received: from mail-pg1-f194.google.com ([209.85.215.194]:36967 "EHLO mail-pg1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727241AbeI0No4 (ORCPT ); Thu, 27 Sep 2018 09:44:56 -0400 Received: by mail-pg1-f194.google.com with SMTP id c10-v6so1271319pgq.4 for ; Thu, 27 Sep 2018 00:28:04 -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=x/bf2B1O28GlgKGBsL6ZOOMbTs1zvo6PdwDnoQ9v8SI=; b=P21zi9SroQP4SXIEgEKFLBdEGFu231uF0aKnJLyNMhhgTkxu5m61hZtU5PsMx6HPvs 4t+FeS/GuRqfdf/2rVyymJtM4SxCJj3i1q7WZXagDr3+Yq/t0ypcOGNgxMKAtDdnB3/R TYf1lFouRJtSrQLHgoJre1bMFxw1ywTznLHfc= 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=x/bf2B1O28GlgKGBsL6ZOOMbTs1zvo6PdwDnoQ9v8SI=; b=ZXVsxKK9azxwRvMi1Igz5V3bqS2aTr1VnmZBzDc4m24gZRBxJPSdcHeQpkELaJ/ttc x+DDaRTwcWDypLQLpPe36u6UpSopX06OcuKNeFr3ba0LCUyx43uUqrohsEv404watQUu KD5Yv0X5UKh2bKhDLPu9azfnwbjBDG+5WfpnDr7+y9zxg91zNrUUxTyUdQB2pPDrA2s5 lqnWEKlRaKNOInWDCvMl88b1CldRl27CEtlm0Kk7KBEXs+3+ARolL+kyaYezjnHOBXZ7 aCkbH04rdIdWmIl4j+6Bw0Vm35TVcumbqKVD8co4gz7P437yQbpG+xY8UNQ8UySyshfz MmvQ== X-Gm-Message-State: ABuFfog4/pwmWm2F2YCFxZh+CHB3YrqeyVci55bqRiTevhmLKT10CmQ5 DoYirbuRy6Mp4XgczBwpJUb9cQ== X-Received: by 2002:a63:525c:: with SMTP id s28-v6mr8835814pgl.78.1538033284358; Thu, 27 Sep 2018 00:28:04 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.102]) by smtp.gmail.com with ESMTPSA id h12-v6sm1835018pfo.135.2018.09.27.00.27.59 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 27 Sep 2018 00:28:03 -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, ctatlor97@gmail.com, linus.walleij@linaro.org Subject: [PATCH v3 4/4] power: supply: Add Spreadtrum SC27XX fuel gauge unit driver Date: Thu, 27 Sep 2018 15:26:57 +0800 Message-Id: X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> References: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> In-Reply-To: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> References: <2787f18a0366576959557d05112a069dca982269.1538033078.git.baolin.wang@linaro.org> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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 Acked-by: Linus Walleij --- Changes from v2: - Use core helper functions to look up OCV capacity table. - Use device_property_read_u32() instead of of_property_read_u32(). - Add acked tag from Linus. Changes from v1: - Use battery standard properties to get internal resistance and ocv table. - Change devm_gpiod_get_optional() to devm_gpiod_get(). - Add power_supply_changed() when detecting battery present change. - Return micro volts for sc27xx_fgu_get_vbat_ocv(). --- drivers/power/supply/Kconfig | 7 + drivers/power/supply/Makefile | 1 + drivers/power/supply/sc27xx_fuel_gauge.c | 661 ++++++++++++++++++++++++++++++ 3 files changed, 669 insertions(+) create mode 100644 drivers/power/supply/sc27xx_fuel_gauge.c -- 1.7.9.5 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..1c0b856 --- /dev/null +++ b/drivers/power/supply/sc27xx_fuel_gauge.c @@ -0,0 +1,661 @@ +// 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_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 + * @internal_resist: the battery internal 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 internal_resist; + int total_cap; + int init_cap; + int init_clbcnt; + int max_volt; + int table_len; + struct power_supply_battery_ocv_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; +} + +/* + * 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->internal_resist) / 1000; + + /* + * Parse the capacity table to look up the correct capacity percent + * according to current battery's corresponding OCV values. + */ + *cap = power_supply_ocv2cap_simple(data->cap_table, data->table_len, + 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; + + /* Return the battery OCV in micro volts. */ + *val = vol * 1000 - cur * data->internal_resist; + + 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; + 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); + } + + data->bat_present = !!state; + + mutex_unlock(&data->lock); + + power_supply_changed(data->battery); + 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 = { }; + struct power_supply_battery_ocv_table *table; + int ret, i; + + 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; + data->internal_resist = info.factory_internal_resistance_uohm / 1000; + + /* + * For SC27XX fuel gauge device, we only use one ocv-capacity + * table in normal temperature 20 Celsius. + */ + table = power_supply_find_ocv2cap_table(&info, 20, &data->table_len); + if (!table) + return -EINVAL; + + data->cap_table = devm_kzalloc(data->dev, + data->table_len * sizeof(*table), + GFP_KERNEL); + if (!data->cap_table) { + power_supply_put_battery_info(data->battery, &info); + return -ENOMEM; + } + + for (i = 0; i < data->table_len; i++) { + data->cap_table[i].ocv = table[i].ocv / 1000; + data->cap_table[i].capacity = table[i].capacity; + } + + power_supply_put_battery_info(data->battery, &info); + + /* 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_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; + } + + ret = device_property_read_u32(&pdev->dev, "reg", &data->base); + if (ret) { + dev_err(&pdev->dev, "failed to get fgu address\n"); + return ret; + } + + data->channel = devm_iio_channel_get(&pdev->dev, "bat-temp"); + if (IS_ERR(data->channel)) { + dev_err(&pdev->dev, "failed to get IIO channel\n"); + return PTR_ERR(data->channel); + } + + data->gpiod = devm_gpiod_get(&pdev->dev, "bat-detect", GPIOD_IN); + if (IS_ERR(data->gpiod)) { + dev_err(&pdev->dev, "failed to get battery detection GPIO\n"); + return PTR_ERR(data->gpiod); + } + + ret = gpiod_get_value_cansleep(data->gpiod); + if (ret < 0) { + dev_err(&pdev->dev, "failed to get gpio state\n"); + return ret; + } + + data->bat_present = !!ret; + mutex_init(&data->lock); + data->dev = &pdev->dev; + + 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");