From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 691E4CD5BC9 for ; Thu, 5 Sep 2024 14:49:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Z9IgYD/2bP3HwiWDe9m6U4cOpfzwTsOumgc5N6zAYJA=; b=k9IKH85a8YHaY2ozAcpE0MVZ+3 xoLmD/XBc8yaZ8aIbFLwqDQ2b1uM7Hlh9FxJO5TChOJ04+nTehwzWwIHXyFGPTNk51ydjLXRaA4CG UipL9Pzxv0mdVbZhDqGvAOqxGNs63UJdq51FBriFdEWO2XRGuB+V2xUeAulRUTx8xpsNYLIgMi1ly 7OLEtVWmurt3T+GrW1uMsGSd8hDzvpMRZEyHcAP70wbyA0GdNE0nNG39hoF8qB/CSndqsVtV3xB82 5k2ruhKvPAF+1JTa53eOmlfQlKsWCxePeJU/wZHHYP0hSOLz2O0cQK29+kHiia69Ynax9jp1iDaqq NfhL4alw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1smDno-00000008n47-3qIa; Thu, 05 Sep 2024 14:49:40 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1smDmr-00000008mvY-00kd; Thu, 05 Sep 2024 14:48:42 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sntech.de; s=gloria202408; h=Content-Type:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=Z9IgYD/2bP3HwiWDe9m6U4cOpfzwTsOumgc5N6zAYJA=; b=w/b4diqw5J8ZIWZLi5djL0KZax oYskcatg6UJKVdLpBuSCCoPxb857ufeJN9eshcmsi68J/7ptbzWk043BsCHcRZ+oXflAwquP5rcoA MV40is1liBi9d8axQSJHuIhypek6r9Lvz4WU8t+VItpygoIB3Qrdq4VKamWkE7HBi7vMET96xV0oC yyF4mAvu0ThWEjYfLULsTtkVHc3A6s7wx5yRnUz9WjN0FdjUpRdKbQ0bD/gnSFwMp9guoDc2fL3HW 4iE5WgDR4IijnID5sLC2t6JfrtyLyvB2hFOMLYI26aTLd/qZk5RdFq5LFYVTydBQ05sXM6fHcZQsu 0P35Q/gw==; Received: from i5e860d0f.versanet.de ([94.134.13.15] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1smDmd-0002HD-Hx; Thu, 05 Sep 2024 16:48:27 +0200 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Lee Jones Cc: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, jdelvare@suse.com, linux@roeck-us.net, dmitry.torokhov@gmail.com, pavel@ucw.cz, ukleinek@debian.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org Subject: Re: [PATCH v6 3/7] leds: add driver for LEDs from qnap-mcu devices Date: Thu, 05 Sep 2024 16:50:22 +0200 Message-ID: <3627679.ZzFAyJQhcr@diego> In-Reply-To: <20240829162705.GR6858@google.com> References: <20240825203235.1122198-1-heiko@sntech.de> <20240825203235.1122198-4-heiko@sntech.de> <20240829162705.GR6858@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240905_074841_076577_C150680E X-CRM114-Status: GOOD ( 25.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Am Donnerstag, 29. August 2024, 18:27:05 CEST schrieben Sie: > On Sun, 25 Aug 2024, Heiko Stuebner wrote: > > > This adds a driver that connects to the qnap-mcu mfd driver and provides > > access to the LEDs on it. > > > > Signed-off-by: Heiko Stuebner [...] > > +{ > > + struct qnap_mcu_err_led *err_led = cdev_to_qnap_mcu_err_led(led_cdev); > > + u8 cmd[] = { 0x40, 0x52, 0x30 + err_led->num, 0x30 }; > > Really not fan of these magic values being used raw like this. Me neither, I tried my luck with QNAP support to get some sort of documentation on what these magic characters mean, and it did even get up to some "product team" but ultimately they decided against providing any help. But ok, if it makes you feel more at ease, I'll switch to at least replaying ascii-values where possible :-) . > > +static int qnap_mcu_err_led_blink_set(struct led_classdev *led_cdev, > > + unsigned long *delay_on, > > + unsigned long *delay_off) > > +{ > > + struct qnap_mcu_err_led *err_led = cdev_to_qnap_mcu_err_led(led_cdev); > > + u8 cmd[] = { 0x40, 0x52, 0x30 + err_led->num, 0x30 }; > > + > > + /* LED is off, nothing to do */ > > + if (err_led->mode == QNAP_MCU_ERR_LED_OFF) > > + return 0; > > + > > + if (*delay_on < 500) { > > Setting delay_on based on the current value of delay_on sounds sketchy. As far as I understood the API, the parameter should indicated the wanted blink time, while the function then should set in those variables the delay the driver actually set. So if the delay_on is < 500, select the fast blink mode, which is this 100/100 variant and for everything >= 500 the slow blink mode. I.e. you set the trigger to "timer" and this creates the delay_on and delay_off sysfs files, where you put you wish into and can read the actually set delays out of. > > + *delay_on = 100; > > + *delay_off = 100; > > + err_led->mode = QNAP_MCU_ERR_LED_BLINK_FAST; > > + } else { > > + *delay_on = 500; > > + *delay_off = 500; > > + err_led->mode = QNAP_MCU_ERR_LED_BLINK_SLOW; > > + } > > How do you change from a fast to a slow blinking LED and back again? echo timer > /sys/class/leds/hdd4:red:status/trigger ## creates delay_on + delay_off sysfs files echo 150 > /sys/class/leds/hdd4:red:status/delay_on cat /sys/class/leds/hdd4:red:status/delay_on --> 100 echo 250 > /sys/class/leds/hdd4:red:status/delay_on cat /sys/class/leds/hdd4:red:status/delay_on --> 100 ## switch to slow blink echo 500 > /sys/class/leds/hdd4:red:status/delay_on cat /sys/class/leds/hdd4:red:status/delay_on --> 500 echo 600 > /sys/class/leds/hdd4:red:status/delay_on cat /sys/class/leds/hdd4:red:status/delay_on --> 500 ## switch to fast blink again echo 150 > /sys/class/leds/hdd4:red:status/delay_on cat /sys/class/leds/hdd4:red:status/delay_on --> 100 echo heartbeat > /sys/class/leds/hdd4:red:status/trigger ## removes the delay_on + delay_off files again Heiko