From patchwork Wed Dec 14 16:38:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 705719 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3tf2N60z8bz9t3K for ; Thu, 15 Dec 2016 03:39:18 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932983AbcLNQjF (ORCPT ); Wed, 14 Dec 2016 11:39:05 -0500 Received: from mx1.redhat.com ([209.132.183.28]:32926 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932979AbcLNQjE (ORCPT ); Wed, 14 Dec 2016 11:39:04 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 549BB1831; Wed, 14 Dec 2016 16:38:58 +0000 (UTC) Received: from shalem.localdomain.com (vpn1-5-28.ams2.redhat.com [10.36.5.28]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uBEGcsXH019497; Wed, 14 Dec 2016 11:38:57 -0500 From: Hans de Goede To: Sebastian Reichel , Chen-Yu Tsai Cc: "russianneuromancer @ ya . ru" , linux-pm@vger.kernel.org, linux-i2c@vger.kernel.org, Hans de Goede Subject: [PATCH 2/4] power: supply: axp288_fuel_gauge: Read 15 bit values 2 registers at a time Date: Wed, 14 Dec 2016 17:38:51 +0100 Message-Id: <20161214163853.454-2-hdegoede@redhat.com> In-Reply-To: <20161214163853.454-1-hdegoede@redhat.com> References: <20161214163853.454-1-hdegoede@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Wed, 14 Dec 2016 16:38:58 +0000 (UTC) Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org In order for the MSB -> LSB latching to work correctly we must read the 2 8 bit registers of a 15 bit value in one consecutive read. This fixes charge_full reporting 3498768 on some reads and 3354624 one other reads on my tablet (for the 3354624 value the raw LSB is 0x00). Signed-off-by: Hans de Goede --- drivers/power/supply/axp288_fuel_gauge.c | 63 +++++++++++++++++--------------- 1 file changed, 34 insertions(+), 29 deletions(-) diff --git a/drivers/power/supply/axp288_fuel_gauge.c b/drivers/power/supply/axp288_fuel_gauge.c index f62f9df..99d6d30 100644 --- a/drivers/power/supply/axp288_fuel_gauge.c +++ b/drivers/power/supply/axp288_fuel_gauge.c @@ -29,6 +29,7 @@ #include #include #include +#include #define CHRG_STAT_BAT_SAFE_MODE (1 << 3) #define CHRG_STAT_BAT_VALID (1 << 4) @@ -73,17 +74,15 @@ #define FG_CNTL_CC_EN (1 << 6) #define FG_CNTL_GAUGE_EN (1 << 7) +#define FG_15BIT_WORD_VALID (1 << 15) +#define FG_15BIT_VAL_MASK 0x7fff + #define FG_REP_CAP_VALID (1 << 7) #define FG_REP_CAP_VAL_MASK 0x7F #define FG_DES_CAP1_VALID (1 << 7) -#define FG_DES_CAP1_VAL_MASK 0x7F -#define FG_DES_CAP0_VAL_MASK 0xFF #define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */ -#define FG_CC_MTR1_VALID (1 << 7) -#define FG_CC_MTR1_VAL_MASK 0x7F -#define FG_CC_MTR0_VAL_MASK 0xFF #define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */ #define FG_OCV_CAP_VALID (1 << 7) @@ -189,6 +188,28 @@ static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val) return ret; } +static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg) +{ + unsigned char buf[2]; + int ret; + + ret = regmap_bulk_read(info->regmap, reg, buf, 2); + if (ret < 0) { + dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n", + reg, ret); + return ret; + } + + ret = get_unaligned_be16(buf); + if (!(ret & FG_15BIT_WORD_VALID)) { + dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n", + reg); + return -ENXIO; + } + + return ret & FG_15BIT_VAL_MASK; +} + static int pmic_read_adc_val(const char *name, int *raw_val, struct axp288_fg_info *info) { @@ -255,18 +276,12 @@ static int fuel_gauge_debug_show(struct seq_file *s, void *data) seq_printf(s, " FG_OCVL[%02x] : %02x\n", AXP288_FG_OCVL_REG, fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG)); - seq_printf(s, "FG_DES_CAP1[%02x] : %02x\n", + seq_printf(s, " FG_DES_CAP[%02x] : %04x\n", AXP288_FG_DES_CAP1_REG, - fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG)); - seq_printf(s, "FG_DES_CAP0[%02x] : %02x\n", - AXP288_FG_DES_CAP0_REG, - fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG)); - seq_printf(s, " FG_CC_MTR1[%02x] : %02x\n", + fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG)); + seq_printf(s, " FG_CC_MTR[%02x] : %04x\n", AXP288_FG_CC_MTR1_REG, - fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG)); - seq_printf(s, " FG_CC_MTR0[%02x] : %02x\n", - AXP288_FG_CC_MTR0_REG, - fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG)); + fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG)); seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n", AXP288_FG_OCV_CAP_REG, fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG)); @@ -663,28 +678,18 @@ static int fuel_gauge_get_property(struct power_supply *ps, val->intval = POWER_SUPPLY_TECHNOLOGY_LION; break; case POWER_SUPPLY_PROP_CHARGE_NOW: - ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG); + ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG); if (ret < 0) goto fuel_gauge_read_err; - value = (ret & FG_CC_MTR1_VAL_MASK) << 8; - ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG); - if (ret < 0) - goto fuel_gauge_read_err; - value |= (ret & FG_CC_MTR0_VAL_MASK); - val->intval = value * FG_DES_CAP_RES_LSB; + val->intval = ret * FG_DES_CAP_RES_LSB; break; case POWER_SUPPLY_PROP_CHARGE_FULL: - ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG); + ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG); if (ret < 0) goto fuel_gauge_read_err; - value = (ret & FG_DES_CAP1_VAL_MASK) << 8; - ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG); - if (ret < 0) - goto fuel_gauge_read_err; - value |= (ret & FG_DES_CAP0_VAL_MASK); - val->intval = value * FG_DES_CAP_RES_LSB; + val->intval = ret * FG_DES_CAP_RES_LSB; break; case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: val->intval = PROP_CURR(info->pdata->design_cap);