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Mon, 17 Sep 2018 03:03:28 +0000 Received: from CY4PR21MB0776.namprd21.prod.outlook.com ([fe80::54e2:88e0:b622:b36]) by CY4PR21MB0776.namprd21.prod.outlook.com ([fe80::54e2:88e0:b622:b36%5]) with mapi id 15.20.1185.003; Mon, 17 Sep 2018 03:03:28 +0000 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Matt Ranostay , Arnd Bergmann , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH AUTOSEL 4.14 03/87] tsl2550: fix lux1_input error in low light Thread-Topic: [PATCH AUTOSEL 4.14 03/87] tsl2550: fix lux1_input error in low light Thread-Index: AQHUTjLcKmeaVwcp0kiYn2nLdHmnuA== Date: Mon, 17 Sep 2018 03:02:26 +0000 Message-ID: <20180917030220.245686-3-alexander.levin@microsoft.com> References: <20180917030220.245686-1-alexander.levin@microsoft.com> In-Reply-To: <20180917030220.245686-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;CY4PR21MB0855;6:2ejrD/fyKx+3O++vYXofNlRi3JDgxxjYHo9D871G5ZLM88RbamUjg1FX4zgx98RS23yasbMzYioWkU8u71x1cgZhvLPvjTnWY4B6KmKDBs07HqSopVky9lBNgf025ZinKFOgnypD5txcRpkyXP3pmlhwk9j+u+L42Ch5DvXEjNr9ir9ZK6MTLWPNgy2vG593PdpW66HYU4XXaFtp9iXjokBQkrR2LHtY+zeSSUF5fLg7pW32eEoAkT0lz9cF240kvaq9IpK8+I6W+rjUJJ9LDmjqOT+RonJ+xzqldNff8hKM/wvQtooO0PotFQzEm/wAZPrqJy27DGCDkCTkAoTC3OX4Ba6W0FFDZysG4hE2VWSLc0X/9mtamWmAoGf09u4Jr2BMUps8hdLWPTGJk+nkYNVaINtJiW3LmuC+wU6iURkVpsIGrrTN/9sOQXpikAB7hFJVZjq68j/uiGeCoeHGJA==;5:fDIyZ6ektKLtSt4ITlRvosO9uwtrA1QCn1pca/h+wJ08toXQDR/J1J91U+B+IMMFGamQgXVpRAlgHTfmVkS+M7T+DhpdCfKFspqr25jQS4gOEBk6wmGwjPxzHO/Xycjqp4q8VF7iPRSWWOEArlBuIp5QtKbyULq/+leCuoF6dlA=;7:cd0t0w6+qvJCWTEB2TjRXLbkeVW/u8jDOytkPSksoNYAH2EOTnBoO0odiROVkubqtZ7EkOtbuVQ5zvL7k6cW2BTTrRZN7jjc5QguwyILco7fljoS8VzxZbA+jN8zgGuwi40NFOIHfX3l1Zch3yY5WuHjQM57W//P8mcmn9FNOsxGWir0gdnRdyA/e9CqzWQM4pcIx/l8tZfChwobhiBSoF8snBC+8k532W9RYW0SJEKE+Ehx2Tfm/ECB88FeR496 x-ms-office365-filtering-correlation-id: bb3dc203-f6c3-4e0d-5d84-08d61c4a2458 x-ms-office365-filtering-ht: Tenant x-microsoft-antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989137)(4534165)(4627221)(201703031133081)(201702281549075)(8990107)(5600074)(711020)(4618075)(2017052603328)(7193020);SRVR:CY4PR21MB0855; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Alexander.Levin@microsoft.com; x-microsoft-antispam-message-info: Tqem0w8fe2doYM4K+TyOcA1BP2t64hguc9makwF9cwMKU5JTQqDXs7R9TmJ1tEi1FprbI1VloMREjhP4h3b92aZ8A7OBJTfQCr6STqHWHJyC1DCrbPYmKYykJbVmAPZGzvf5QiJb893P6HNyWlG67rOHT9TZCZo3t7nsisgLIUwnLL3apzXG9RpbAYN6aTca32X6NnkNCwdW09ymvWKxk/Qj0LvM60qIqBOrvv0y387IrVbtKsAP9HaIXU6rPAUmSjN5Ay1WgclR+ZJqFFwBox91BMdXGiZMhquPSyB+gfa92dFlvGHvn1tSWl67r8QoUQVmYgmCivQ4H7p/8WWhR8jxtwyUyonHdd8jcEu2JZM= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: bb3dc203-f6c3-4e0d-5d84-08d61c4a2458 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Sep 2018 03:02:26.2752 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR21MB0855 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Matt Ranostay [ Upstream commit ce054546cc2c26891cefa2f284d90d93b52205de ] ADC channel 0 photodiode detects both infrared + visible light, but ADC channel 1 just detects infrared. However, the latter is a bit more sensitive in that range so complete darkness or low light causes a error condition in which the chan0 - chan1 is negative that results in a -EAGAIN. This patch changes the resulting lux1_input sysfs attribute message from "Resource temporarily unavailable" to a user-grokable lux value of 0. Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Signed-off-by: Matt Ranostay Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/misc/tsl2550.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/tsl2550.c b/drivers/misc/tsl2550.c index adf46072cb37..3fce3b6a3624 100644 --- a/drivers/misc/tsl2550.c +++ b/drivers/misc/tsl2550.c @@ -177,7 +177,7 @@ static int tsl2550_calculate_lux(u8 ch0, u8 ch1) } else lux =3D 0; else - return -EAGAIN; + return 0; =20 /* LUX range check */ return lux > TSL2550_MAX_LUX ? TSL2550_MAX_LUX : lux; --=20 2.17.1