From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06596C433B4 for ; Mon, 3 May 2021 17:01:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFE1F60230 for ; Mon, 3 May 2021 17:01:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234598AbhECRCM (ORCPT ); Mon, 3 May 2021 13:02:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:45140 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233639AbhECQyB (ORCPT ); Mon, 3 May 2021 12:54:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C8F2A6193E; Mon, 3 May 2021 16:42:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620060132; bh=60simQmftetfoxjIzV6u5ksLLVJJ11YGwYpyidAI518=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=o3h2alyC1mZvOhIZpv/bw0KdKEtQZENPXZQyAmOdzPL/X4Hc+swhS5Cd/sw1WC6Ea Qo+vPStnDYlPT6ktHt0Rt2ranDSiNE4gamp+BD2jzN5tWSnnvlUJ31G9IMvGp/4qUX TDc/uh1RnnmlETj7tY2iC2OyoD8q+Aor5+1AIYpwvxoZ46YWJSz+ZSJMMBARwZbIs8 Goj9pp2itFwrulGlsmaS//r09eABZ0cmjO2klumi0uPELLnVdQLexWoeJifYVC6iHb PfbH43WYnuqZNablC67vqDp0v3DkFV9pWLGkP/1ojGtG+ya9Wnvv5hq0qxs3Fkm21w lQoJ2ae2gB4Hw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Matthias Schiffer , Sebastian Reichel , Sasha Levin , linux-pm@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 05/31] power: supply: bq27xxx: fix power_avg for newer ICs Date: Mon, 3 May 2021 12:41:38 -0400 Message-Id: <20210503164204.2854178-5-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210503164204.2854178-1-sashal@kernel.org> References: <20210503164204.2854178-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Matthias Schiffer [ Upstream commit c4d57c22ac65bd503716062a06fad55a01569cac ] On all newer bq27xxx ICs, the AveragePower register contains a signed value; in addition to handling the raw value as unsigned, the driver code also didn't convert it to µW as expected. At least for the BQ28Z610, the reference manual incorrectly states that the value is in units of 1mW and not 10mW. I have no way of knowing whether the manuals of other supported ICs contain the same error, or if there are models that actually use 1mW. At least, the new code shouldn't be *less* correct than the old version for any device. power_avg is removed from the cache structure, se we don't have to extend it to store both a signed value and an error code. Always getting an up-to-date value may be desirable anyways, as it avoids inconsistent current and power readings when switching between charging and discharging. Signed-off-by: Matthias Schiffer Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/supply/bq27xxx_battery.c | 51 ++++++++++++++------------ include/linux/power/bq27xxx_battery.h | 1 - 2 files changed, 27 insertions(+), 25 deletions(-) diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c index a7d8cadf172c..3e8466064bb2 100644 --- a/drivers/power/supply/bq27xxx_battery.c +++ b/drivers/power/supply/bq27xxx_battery.c @@ -1445,27 +1445,6 @@ static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg) return tval * 60; } -/* - * Read an average power register. - * Return < 0 if something fails. - */ -static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di) -{ - int tval; - - tval = bq27xxx_read(di, BQ27XXX_REG_AP, false); - if (tval < 0) { - dev_err(di->dev, "error reading average power register %02x: %d\n", - BQ27XXX_REG_AP, tval); - return tval; - } - - if (di->opts & BQ27XXX_O_ZERO) - return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS; - else - return tval; -} - /* * Returns true if a battery over temperature condition is detected */ @@ -1562,8 +1541,6 @@ void bq27xxx_battery_update(struct bq27xxx_device_info *di) } if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR) cache.cycle_count = bq27xxx_battery_read_cyct(di); - if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR) - cache.power_avg = bq27xxx_battery_read_pwr_avg(di); /* We only have to read charge design full once */ if (di->charge_design_full <= 0) @@ -1625,6 +1602,32 @@ static int bq27xxx_battery_current(struct bq27xxx_device_info *di, return 0; } +/* + * Get the average power in µW + * Return < 0 if something fails. + */ +static int bq27xxx_battery_pwr_avg(struct bq27xxx_device_info *di, + union power_supply_propval *val) +{ + int power; + + power = bq27xxx_read(di, BQ27XXX_REG_AP, false); + if (power < 0) { + dev_err(di->dev, + "error reading average power register %02x: %d\n", + BQ27XXX_REG_AP, power); + return power; + } + + if (di->opts & BQ27XXX_O_ZERO) + val->intval = (power * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS; + else + /* Other gauges return a signed value in units of 10mW */ + val->intval = (int)((s16)power) * 10000; + + return 0; +} + static int bq27xxx_battery_status(struct bq27xxx_device_info *di, union power_supply_propval *val) { @@ -1790,7 +1793,7 @@ static int bq27xxx_battery_get_property(struct power_supply *psy, ret = bq27xxx_simple_value(di->cache.energy, val); break; case POWER_SUPPLY_PROP_POWER_AVG: - ret = bq27xxx_simple_value(di->cache.power_avg, val); + ret = bq27xxx_battery_pwr_avg(di, val); break; case POWER_SUPPLY_PROP_HEALTH: ret = bq27xxx_simple_value(di->cache.health, val); diff --git a/include/linux/power/bq27xxx_battery.h b/include/linux/power/bq27xxx_battery.h index e6187f524f2c..534a8080c6a3 100644 --- a/include/linux/power/bq27xxx_battery.h +++ b/include/linux/power/bq27xxx_battery.h @@ -47,7 +47,6 @@ struct bq27xxx_reg_cache { int capacity; int energy; int flags; - int power_avg; int health; }; -- 2.30.2