From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (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 AE5922FB0 for ; Sun, 16 May 2021 10:53:53 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id C115361182; Sun, 16 May 2021 10:53:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1621162432; bh=I1yV79WAicyardZtVgX3QIlFbOt2vtB/eAA+wO6deO0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IdkCWul9+GnWF754+OyB6u/hDlB9cqf4dv5gzVXxd5DQzZnr3fgT15bhj2+QT9fHQ fTlU5ui4CbCR7EcPeUd+mVL03x5GvSt7CcIeL1llne5A6IPAdxJQ/HUBThXqeVY07X 4JLT52GMubpN283bD7Ja9xjQUPaAExcICL+tTtciY1gqtko3LQX4KdlmxtgouH1Hq9 35+dOjRATVie3rlG0xB762A35PlllzfHtzqf+OEYI3N12imz4EjKv8lCpAW23Qcd9r P49eDGNiMU7bMvsGrEqHQn+/4WmcqmcuExUZEtsWxjxn2yV/6GRqNb5gQ3/muDsXs9 0Q5VbBD4sXsEQ== Received: by mail.kernel.org with local (Exim 4.94.2) (envelope-from ) id 1liEP8-003s88-Ow; Sun, 16 May 2021 12:53:50 +0200 From: Mauro Carvalho Chehab To: gregkh@linuxfoundation.org Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab , "Pavel Machek" , Mauro Carvalho Chehab , devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, linux-staging@lists.linux.dev Subject: [PATCH 03/17] staging: nuc-wmi: add support for changing S0 brightness Date: Sun, 16 May 2021 12:53:31 +0200 Message-Id: <682adcb43cc67c95473a2706b54c023c70799942.1621161037.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: Mauro Carvalho Chehab Now that the core logic is in place, let's add support to adjust the S0 brightness level. Signed-off-by: Mauro Carvalho Chehab --- drivers/staging/nuc-led/nuc-wmi.c | 79 +++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/drivers/staging/nuc-led/nuc-wmi.c b/drivers/staging/nuc-led/nuc-wmi.c index b75ddd47e443..62c2764814dd 100644 --- a/drivers/staging/nuc-led/nuc-wmi.c +++ b/drivers/staging/nuc-led/nuc-wmi.c @@ -392,7 +392,85 @@ static ssize_t store_indicator(struct device *dev, return -EINVAL; } +/* Get S0 brightness */ +static ssize_t show_s0_brightness(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct led_classdev *cdev = dev_get_drvdata(dev); + struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev); + u8 cmd, input[NUM_INPUT_ARGS] = { 0 }; + u8 output[NUM_OUTPUT_ARGS]; + int ret; + + cmd = LED_NEW_GET_STATUS; + input[0] = LED_NEW_GET_CONTROL_ITEM; + input[1] = led->id; + input[2] = led->indicator; + input[3] = 0; + + ret = nuc_nmi_cmd(dev, cmd, input, output); + if (ret) + return ret; + + /* Multicolor uses a scale from 0 to 100 */ + if (led->color_type & (LED_BLUE_AMBER | LED_BLUE_WHITE | LED_RGB)) + return scnprintf(buf, PAGE_SIZE, "%d%%\n", output[0]); + + /* single color uses 0, 50% and 100% */ + return scnprintf(buf, PAGE_SIZE, "%d%%\n", output[0] * 50); +} + +/* Change S0 brightness */ +static ssize_t store_s0_brightness(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct led_classdev *cdev = dev_get_drvdata(dev); + struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev); + u8 cmd, input[NUM_INPUT_ARGS] = { 0 }; + int ret; + u8 val; + + if (led->indicator == LED_IND_DISABLE) { + dev_dbg(dev, "Led %s is disabled. ignoring it.\n", cdev->name); + return -EACCES; + } + + if (kstrtou8(buf, 0, &val) || val > 100) + return -EINVAL; + + /* + * For single-color LEDs, the value should be between 0 to 2, but, + * in order to have a consistent API, let's always handle it as if + * it is a percentage, for both multicolor and single color LEDs. + * So: + * value == 0 will disable the LED + * value up to 74% will set it the brightness to 50% + * value equal or above 75% will use the maximum brightness. + */ + if (!(led->color_type & (LED_BLUE_AMBER | LED_BLUE_WHITE | LED_RGB))) { + if (val > 0 && val < 75) + val = 1; + if (val >= 75) + val = 2; + } + + cmd = LED_SET_VALUE; + input[0] = led->id; + input[1] = led->indicator; + input[2] = 0; /* FIXME: replace by an enum */ + input[3] = val; + + ret = nuc_nmi_cmd(dev, cmd, input, NULL); + if (ret) + return ret; + + return len; +} + static LED_ATTR_RW(indicator); +static LED_ATTR_RW(s0_brightness); /* * Attributes for multicolor LEDs @@ -400,6 +478,7 @@ static LED_ATTR_RW(indicator); static struct attribute *nuc_wmi_multicolor_led_attr[] = { &dev_attr_indicator.attr, + &dev_attr_s0_brightness.attr, NULL, }; -- 2.31.1