From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.zeus03.de (zeus03.de [194.117.254.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 059D0219A7E for ; Fri, 11 Apr 2025 15:57:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=194.117.254.33 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744387048; cv=none; b=AW7hvqYhcQTWq67DIwPr6IwYrj2khISvq/a8jHDkFJ5zqZfjS9qfhONlkL7VorRVyOY+VbIcWAhrFAczsJSY5xSf/n6C0I01CgquVj/0Hq+tOMp6nO0oTteXdZIzhvtwWWM9CSx5eHHxT886+A4oRVpPgnEY5Op6g9BbmBoCTUQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744387048; c=relaxed/simple; bh=LqghTYF593CarAugcf79Kj8blCIBi4NI6YInaHVlFng=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=P3+7Or4Pdl5GouwLzmTJU3S/QDYFKZkhCvTfQwe+fmMwP2leRjnLUQKKYzgaK+s6+5YaMTkYSrWxrjh/dmzMLj0q4VhxitA6RlOxPDeS0fXwCr+2RCLPPIESnImMzTQUOBwcFIGcBbA/8Ds4Hpmw0byGiCag4eIP/OvmE8r3ZN4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com; spf=pass smtp.mailfrom=sang-engineering.com; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b=RMmp59T/; arc=none smtp.client-ip=194.117.254.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b="RMmp59T/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= sang-engineering.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:in-reply-to; s=k1; bh=Lqgh TYF593CarAugcf79Kj8blCIBi4NI6YInaHVlFng=; b=RMmp59T/8aCi2VNF1ahE FX8ON3oJilCNa5faaJV8YMzNPTwHalb+14aJ2Q79+w7azOX3/vVnd46NBl72HARq iVhFW2T4IYZrZA4OSKXXdTLMhDIslDKwZPuxoLlNeACTs7N853jrZgiPqd0udQt4 /J5GJ7d+z+n92zY94y/bwDRq5AmUTcrlymqsMjjz5FZJ+t8PEeWoOjIfgoabTnq8 L7gNgMS/E/xazgs5n6ZsLldslRHzEXug47cAQKcVVYp5jYBhYsk/4WR0B/WIFQ33 xO4xtlmBy4h8oSsp6FJv55O7enY9BQQKauulWO/iOL2djwwKZPLkzFBxGw5wvinP XA== Received: (qmail 1350989 invoked from network); 11 Apr 2025 17:57:23 +0200 Received: by mail.zeus03.de with UTF8SMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 11 Apr 2025 17:57:23 +0200 X-UD-Smtp-Session: l3s3148p1@kkYWwoIy1uMujnsS Date: Fri, 11 Apr 2025 17:57:23 +0200 From: Wolfram Sang To: Michael Opdenacker Cc: Anshul Dalal , linux-input@vger.kernel.org, linux-i2c@vger.kernel.org Subject: Re: I2C: can't detect Adafruit Mini I2C Gamepad on Linux - other devices detected Message-ID: Mail-Followup-To: Wolfram Sang , Michael Opdenacker , Anshul Dalal , linux-input@vger.kernel.org, linux-i2c@vger.kernel.org References: <24f08a7b-4a3c-4cd6-82b7-0f2c9ab4bbef@rootcommit.com> <8d0c8005-57fa-4883-8a01-343ab9170643@rootcommit.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="xeKd/KTtUp+o97yd" Content-Disposition: inline In-Reply-To: <8d0c8005-57fa-4883-8a01-343ab9170643@rootcommit.com> --xeKd/KTtUp+o97yd Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > Plus "i2cdetect -r " shows the device as UU for address 0x50, as > usually happens with a driver is loaded. Always. The address is blocked for userspace in any case. > I thought that connected I2C devices always showed in i2cdetect output, > whether they are declared in the device tree and have a driver or not. This is a valid expectation. Since you used 'i2cdetect -r', it means that the device does not react to the read_byte method. Very strange (if not even against the specs). Did you try without '-r' to use SMBUS_QUICK? What driver are we talking about anyhow? --xeKd/KTtUp+o97yd Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAmf5O+MACgkQFA3kzBSg KbbIHQ/8DBKKM+xa33mVRwuOqrU50yjBmdaLgUJoCaD1MTwYUGFvzryicCpHIsk/ 8CeFZJYi+7JHJi+iqLPQvVVcFERx8CdSO026ZW8+Efp0C8W3PiBuMZDJ3v70AQw+ Ab2WUF4rJvxZdxyPhN0f2loVq6JRMRAu1BiEWALqKhPWp7hLUlLFs259/toJIWE7 JRIDQnmiFLhvCugk7KJFhvX5RcwE8acWbvt6EYIo+GKpAf09v6y9bQTvbBXm/DCK qAEknsLT4IKe6zYQCpmk2dqgap18Aq9bY34Es1zXqpkeXbTV1E1taSGFYRCvLxnA 7f8krKOPp/ilEGnJIv01dMOpM1Dt9TMAZK7SuFGnqG9IhK7OyJypqK10ew8Upq0h Lpvf+ksJbLj+anI7jojEd4vYDkui4A8C4fVkKBa4zH6NCkpemETZ8tioP8THh44E +lhXzNM5qQj7k0HYlavn9DLOwOLzCocKzzwxfHoqq9t5zY/5lSLAyrjFHS4T/NDs TOqGKvQTV/5B1Av4cllGFZZgb3mV24qNHFmPzUzN3mwFZy7RMrPq1+/dRv22+MPj fHYz/DloVx3OKBaNP2eMG3QglimY+XIYm17pzHRbK6O5fAX3xxNfKoYYOwjnkiNV o8y21KIrViPJ+61vpYbbgrMWeDkgJB6vUO2RbDa3UG8QBANJGu0= =pMsv -----END PGP SIGNATURE----- --xeKd/KTtUp+o97yd--