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[2001:470:26:54b:226:9eff:fe70:80c2]) by smtp.gmail.com with ESMTPSA id r12sm168495ljc.40.2021.09.22.06.42.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Sep 2021 06:42:20 -0700 (PDT) Received: from home.paul.comp (home.paul.comp [IPv6:0:0:0:0:0:0:0:1]) by home.paul.comp (8.15.2/8.15.2/Debian-14~deb10u1) with ESMTP id 18MDgHGf020811; Wed, 22 Sep 2021 16:42:18 +0300 Received: (from paul@localhost) by home.paul.comp (8.15.2/8.15.2/Submit) id 18MDgHYD020810; Wed, 22 Sep 2021 16:42:17 +0300 From: Paul Fertser To: linux-hwmon@vger.kernel.org Cc: Jean Delvare , Guenter Roeck , linux-kernel@vger.kernel.org, Paul Fertser Subject: [PATCH 2/3] hwmon: tmp421: report /PVLD condition Date: Wed, 22 Sep 2021 16:41:53 +0300 Message-Id: <20210922134154.20766-2-fercerpav@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210922134154.20766-1-fercerpav@gmail.com> References: <20210922134154.20766-1-fercerpav@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For both local and remote sensors all the supported ICs can report an "undervoltage lockout" condition which means the conversion wasn't properly performed due to insufficient power supply voltage and so the measurement results can't be trusted. Signed-off-by: Paul Fertser --- drivers/hwmon/tmp421.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c index 6175ed4b10bd..9ee4c61531f3 100644 --- a/drivers/hwmon/tmp421.c +++ b/drivers/hwmon/tmp421.c @@ -174,10 +174,10 @@ static int tmp421_read(struct device *dev, enum hwmon_sensor_types type, return 0; case hwmon_temp_fault: /* - * The OPEN bit signals a fault. This is bit 0 of the temperature - * register (low byte). + * Any of OPEN or /PVLD bits indicate a hardware mulfunction + * and the conversion result may be incorrect */ - *val = tmp421->temp[channel] & 0x01; + *val = !!(tmp421->temp[channel] & 0x03); return 0; default: return -EOPNOTSUPP; @@ -190,9 +190,6 @@ static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type, { switch (attr) { case hwmon_temp_fault: - if (channel == 0) - return 0; - return 0444; case hwmon_temp_input: return 0444; default: -- 2.17.1