From patchwork Tue Nov 22 12:34:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Caesar Wang X-Patchwork-Id: 9440985 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 486CC6075F for ; Tue, 22 Nov 2016 12:35:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 39A9E28476 for ; Tue, 22 Nov 2016 12:35:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E5A328529; Tue, 22 Nov 2016 12:35:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A6C7A28522 for ; Tue, 22 Nov 2016 12:35:49 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1c9AIf-0006H2-9i; Tue, 22 Nov 2016 12:35:49 +0000 Received: from mail-pf0-f196.google.com ([209.85.192.196]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1c9AIc-00068g-LI for linux-rockchip@lists.infradead.org; Tue, 22 Nov 2016 12:35:47 +0000 Received: by mail-pf0-f196.google.com with SMTP id 144so1359679pfv.0 for ; Tue, 22 Nov 2016 04:35:26 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=4Y3Pp/yDCQjs3ZC2UwIJ/2OHyuMzoZdEeB/DT2iPZBA=; b=DlypRS1D93EiYzzZOwk/HK4+Gas7X3lIpTn2Oj6Pfv6hEZ1/7Z/dElaTrZDUgfdtua TxkTE7vLCQHiwRBHgJ5nyrSQsYxW359GIfsfF6d6ruTn0u1AjLvH9Y4FL7erVMfyHzec 9YhIm9m7y+y7WGEujwPO3USs4Dm1KRBHFBIo8TwbH7Umtua5PUlInfZE0JcgaJzm9l7K vDfRXyC+v3tFfzsyAy3jwg+frZcgByqiDpdil6CKgeC/OFX6InJZqYiKZbNg8kfBwl3l s83MocZHr1J9ZXYjTqd2vBHSC89EmZ1qJsoOXF0I8nd2VMgEnneXsdmyW/dRxY/AUIli 1NTA== X-Gm-Message-State: AKaTC00e0T0F0eijkCjvaQ8IwGPKapWcgz9IIpjLE0T8HQWIVAZ14AzfZRC4vwHUxA5Leg== X-Received: by 10.99.42.80 with SMTP id q77mr43896707pgq.170.1479818125671; Tue, 22 Nov 2016 04:35:25 -0800 (PST) Received: from localhost.localdomain ([103.29.142.67]) by smtp.gmail.com with ESMTPSA id m5sm27140335pgn.42.2016.11.22.04.35.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 22 Nov 2016 04:35:24 -0800 (PST) From: Caesar Wang To: edubezval@gmail.com, rui.zhang@intel.com Subject: [PATCH 4/5] thermal: rockchip: optimize the conversion table Date: Tue, 22 Nov 2016 20:34:47 +0800 Message-Id: <1479818088-6007-5-git-send-email-wxt@rock-chips.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1479818088-6007-1-git-send-email-wxt@rock-chips.com> References: <1479818088-6007-1-git-send-email-wxt@rock-chips.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161122_043546_823353_9922C5AB X-CRM114-Status: GOOD ( 10.50 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: heiko@sntech.de, linux-pm@vger.kernel.org, briannorris@chromium.org, linux-kernel@vger.kernel.org, smbarber@chromium.org, linux-rockchip@lists.infradead.org, Caesar Wang MIME-Version: 1.0 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+patchwork-linux-rockchip=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP In order to support the valid temperature can conver to analog value. The rockchip thermal has not supported the all valid temperature. For example: In some cases, we need adjust the trip point. $cd /sys/class/thermal/thermal_zone* echo 68000 > trip_point_0_temp That will report the error message before posting this patch. Signed-off-by: Caesar Wang Reviewed-by: Brian Norris --- drivers/thermal/rockchip_thermal.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/thermal/rockchip_thermal.c b/drivers/thermal/rockchip_thermal.c index 535f1fa..f4d4be9 100644 --- a/drivers/thermal/rockchip_thermal.c +++ b/drivers/thermal/rockchip_thermal.c @@ -401,6 +401,8 @@ static u32 rk_tsadcv2_temp_to_code(const struct chip_tsadc_table *table, int temp) { int high, low, mid; + unsigned long num; + unsigned int denom; u32 error = table->data_mask; low = 0; @@ -421,6 +423,27 @@ static u32 rk_tsadcv2_temp_to_code(const struct chip_tsadc_table *table, mid = (low + high) / 2; } + /* + * The conversion code granularity provided by the table. Let's + * assume that the relationship between temperature and + * analog value between 2 table entries is linear and interpolate + * to produce less granular result. + */ + num = abs(table->id[mid].code - table->id[mid + 1].code); + num *= temp - table->id[mid].temp; + denom = table->id[mid + 1].temp - table->id[mid].temp; + + switch (table->mode) { + case ADC_DECREMENT: + return table->id[mid].code - (num / denom); + case ADC_INCREMENT: + return table->id[mid].code + (num / denom); + default: + pr_err("%s: invalid conversion table, mode=%d\n", + __func__, table->mode); + return error; + } + exit: pr_err("%s: invalid temperature, temp=%d error=%d\n", __func__, temp, error);