From patchwork Fri Jul 16 22:03:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 478521 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 142C7C636CA for ; Fri, 16 Jul 2021 22:03:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB197613F7 for ; Fri, 16 Jul 2021 22:03:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237203AbhGPWGj (ORCPT ); Fri, 16 Jul 2021 18:06:39 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:17940 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235482AbhGPWGh (ORCPT ); Fri, 16 Jul 2021 18:06:37 -0400 Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 16GLYbkZ075095; Fri, 16 Jul 2021 18:03:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=CgwkWaQ4NJl1owyNiDDwL3ETFjvGMyOr55HMbCiRtig=; b=Z3G91TqIt6aeCfJ56S2ut9Ircfk/h5sN2IPXDyEMO4ZyZadXRFTUhrqW6KfwFglrozfT 65RoJKwaarAtKhLjGDBs+SmaIS/zCjoZfyDNWuMyk5rSnB/dwsDX26y4966aRGoqocYJ bBRA45jMo52nAWgZndrKvUTyEqPLnf2yXJf7MGdo1/YzdwVwbWuTCDo2uZIl41+O6ia0 Y685KwKvm2Ou70hnZnzwp4gHoiHz9w9FmPTcBqZZ4uLd4B4Xvy1ay2kqnVG9oMrS31t1 IISN2z0OY9zdI1svJ3CUM/30wFA9HIHeaNk4WvbgjFacn55C16fP/QDf6EsMNoVIj5ds RA== Received: from ppma03wdc.us.ibm.com (ba.79.3fa9.ip4.static.sl-reverse.com [169.63.121.186]) by mx0a-001b2d01.pphosted.com with ESMTP id 39ue6vepn7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Jul 2021 18:03:38 -0400 Received: from pps.filterd (ppma03wdc.us.ibm.com [127.0.0.1]) by ppma03wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 16GLwL6l020935; Fri, 16 Jul 2021 22:03:37 GMT Received: from b03cxnp07028.gho.boulder.ibm.com (b03cxnp07028.gho.boulder.ibm.com [9.17.130.15]) by ppma03wdc.us.ibm.com with ESMTP id 39q36efuct-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Jul 2021 22:03:37 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 16GM3a7B42467720 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Jul 2021 22:03:36 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 92ED4C605A; Fri, 16 Jul 2021 22:03:36 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4E049C6055; Fri, 16 Jul 2021 22:03:36 +0000 (GMT) Received: from v0005c16.aus.stglabs.ibm.com (unknown [9.211.92.96]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 16 Jul 2021 22:03:36 +0000 (GMT) From: Eddie James To: linux-leds@vger.kernel.org Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, robh+dt@kernel.org, pavel@ucw.cz, Eddie James Subject: [PATCH v2 4/7] leds: pca955x: Add brightness_get function Date: Fri, 16 Jul 2021 17:03:28 -0500 Message-Id: <20210716220331.49303-5-eajames@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210716220331.49303-1-eajames@linux.ibm.com> References: <20210716220331.49303-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: PYiBdjIqNFJWHt1VF69NF_FLVV6C5fLg X-Proofpoint-GUID: PYiBdjIqNFJWHt1VF69NF_FLVV6C5fLg X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-07-16_10:2021-07-16,2021-07-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 phishscore=0 mlxlogscore=999 mlxscore=0 impostorscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107160136 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add a function to fetch the state of the hardware LED. Signed-off-by: Eddie James --- drivers/leds/leds-pca955x.c | 52 +++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c index f0d841cb59fc..e47ba7c3b7c7 100644 --- a/drivers/leds/leds-pca955x.c +++ b/drivers/leds/leds-pca955x.c @@ -233,6 +233,57 @@ static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val) return 0; } +static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val) +{ + struct pca955x *pca955x = i2c_get_clientdata(client); + u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n); + int ret; + + ret = i2c_smbus_read_byte_data(client, cmd); + if (ret < 0) { + dev_err(&client->dev, "%s: reg 0x%x, err %d\n", + __func__, n, ret); + return ret; + } + *val = (u8)ret; + return 0; +} + +static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev) +{ + struct pca955x_led *pca955x_led = container_of(led_cdev, + struct pca955x_led, + led_cdev); + struct pca955x *pca955x = pca955x_led->pca955x; + u8 ls, pwm; + int ret; + + ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls); + if (ret) + return ret; + + ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3; + switch (ls) { + case PCA955X_LS_LED_ON: + ret = LED_FULL; + break; + case PCA955X_LS_LED_OFF: + ret = LED_OFF; + break; + case PCA955X_LS_BLINK0: + ret = LED_HALF; + break; + case PCA955X_LS_BLINK1: + ret = pca955x_read_pwm(pca955x->client, 1, &pwm); + if (ret) + return ret; + ret = 255 - pwm; + break; + } + + return ret; +} + static int pca955x_led_set(struct led_classdev *led_cdev, enum led_brightness value) { @@ -512,6 +563,7 @@ static int pca955x_probe(struct i2c_client *client, led->name = pca955x_led->name; led->brightness_set_blocking = pca955x_led_set; + led->brightness_get = pca955x_led_get; err = devm_led_classdev_register(&client->dev, led); if (err)