From patchwork Mon Dec 18 20:30:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: srinivas pandruvada X-Patchwork-Id: 756269 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) (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 73F961E52B; Mon, 18 Dec 2023 20:30:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Kai625IU" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1702931439; x=1734467439; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=X3DZC0thtx+lpV/xVAPFqdSngEklAG5mK84qDgaJh9w=; b=Kai625IUZ8UgW7Pk24YRtOzfjjnLAoHJMSnywclBQPenRpyQ0CWOa6ln alAwa4K7Dsd+pSNdirynLHBMCwFMSS2Owb5X4ySWilb2Yo1N2EW7S85EY WOXLUgDg00ie+4m5LxpsjHMtFWxbEe3Z3gvJHTCO1k5ScjQPTBlsfClzw DqafALGBRaU1+FiF25KKCAetHsK4CpXzxw9uQwiAIsaLdOkmW9vrekow9 rOtEMQOwTbk4SsUcNZRAPl/56dQBiQo/kJRm9y4YzMaTO6oa05hw7i5Vi X1t972QtMqAL2zH0JKGQekUQV0QtrlV5CP7NB2sXU2xNGUI4N+j2Q4pvX Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10928"; a="395289748" X-IronPort-AV: E=Sophos;i="6.04,286,1695711600"; d="scan'208";a="395289748" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Dec 2023 12:30:37 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10928"; a="751879652" X-IronPort-AV: E=Sophos;i="6.04,286,1695711600"; d="scan'208";a="751879652" Received: from spandruv-desk.jf.intel.com ([10.54.75.14]) by orsmga006.jf.intel.com with ESMTP; 18 Dec 2023 12:30:37 -0800 From: Srinivas Pandruvada To: jikos@kernel.org, jic23@kernel.org, lars@metafoo.de, Basavaraj.Natikar@amd.com Cc: linux-input@vger.kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Srinivas Pandruvada Subject: [PATCH v2 1/3] iio: hid-sensor-als: Allocate channels dynamically Date: Mon, 18 Dec 2023 12:30:24 -0800 Message-Id: <20231218203026.1156375-2-srinivas.pandruvada@linux.intel.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231218203026.1156375-1-srinivas.pandruvada@linux.intel.com> References: <20231218203026.1156375-1-srinivas.pandruvada@linux.intel.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Instead of assuming that every channel defined statically by als_channels[] is present, allocate dynamically based on presence of the respective usage id in the descriptor. This will allow to register ALS with limited channel support. Append the timestamp as the last channel. There is no intentional function changes done. Signed-off-by: Srinivas Pandruvada --- v2: New change drivers/iio/light/hid-sensor-als.c | 57 ++++++++++++++++++------------ 1 file changed, 35 insertions(+), 22 deletions(-) diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c index 5cd27f04b45e..e57ad1946b56 100644 --- a/drivers/iio/light/hid-sensor-als.c +++ b/drivers/iio/light/hid-sensor-als.c @@ -236,14 +236,21 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev, /* Parse report which is specific to an usage id*/ static int als_parse_report(struct platform_device *pdev, - struct hid_sensor_hub_device *hsdev, - struct iio_chan_spec *channels, - unsigned usage_id, - struct als_state *st) + struct hid_sensor_hub_device *hsdev, + struct iio_chan_spec **channels_out, + int *size_channels_out, + unsigned int usage_id, + struct als_state *st) { - int ret; + struct iio_chan_spec *channels; + int ret, index = 0; int i; + channels = devm_kcalloc(&pdev->dev, ARRAY_SIZE(als_channels), + sizeof(als_channels), GFP_KERNEL); + if (!channels) + return -ENOMEM; + for (i = 0; i <= CHANNEL_SCAN_INDEX_ILLUM; ++i) { ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT, @@ -251,9 +258,11 @@ static int als_parse_report(struct platform_device *pdev, HID_USAGE_SENSOR_LIGHT_ILLUM, &st->als[i]); if (ret < 0) - return ret; - als_adjust_channel_bit_mask(channels, i, st->als[i].size); + break; + channels[i] = als_channels[i]; + als_adjust_channel_bit_mask(channels, i, st->als[i].size); + ++index; dev_dbg(&pdev->dev, "als %x:%x\n", st->als[i].index, st->als[i].report_id); } @@ -262,17 +271,24 @@ static int als_parse_report(struct platform_device *pdev, &st->als[CHANNEL_SCAN_INDEX_INTENSITY], &st->scale_pre_decml, &st->scale_post_decml); - return ret; + *channels_out = channels; + *size_channels_out = index; + + if (!index) + ret = -ENODEV; + + return 0; } /* Function to initialize the processing for usage id */ static int hid_als_probe(struct platform_device *pdev) { - int ret = 0; + int ret = 0, max_channel_index; static const char *name = "als"; struct iio_dev *indio_dev; struct als_state *als_state; struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; + struct iio_chan_spec *channels; indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state)); if (!indio_dev) @@ -293,24 +309,21 @@ static int hid_als_probe(struct platform_device *pdev) return ret; } - indio_dev->channels = devm_kmemdup(&pdev->dev, als_channels, - sizeof(als_channels), GFP_KERNEL); - if (!indio_dev->channels) { - dev_err(&pdev->dev, "failed to duplicate channels\n"); - return -ENOMEM; - } - - ret = als_parse_report(pdev, hsdev, - (struct iio_chan_spec *)indio_dev->channels, - hsdev->usage, - als_state); + ret = als_parse_report(pdev, hsdev, &channels, &max_channel_index, + hsdev->usage, als_state); if (ret) { dev_err(&pdev->dev, "failed to setup attributes\n"); return ret; } - indio_dev->num_channels = - ARRAY_SIZE(als_channels); + /* Add timestamp channel */ + channels[max_channel_index] = als_channels[CHANNEL_SCAN_INDEX_TIMESTAMP]; + channels[max_channel_index].scan_index = max_channel_index; + + /* +1 for adding timestamp channel */ + indio_dev->num_channels = max_channel_index + 1; + + indio_dev->channels = channels; indio_dev->info = &als_info; indio_dev->name = name; indio_dev->modes = INDIO_DIRECT_MODE;