From patchwork Fri Jul 16 22:03:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 478519 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=ham 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 675BDC6377C for ; Fri, 16 Jul 2021 22:03:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5330D61278 for ; Fri, 16 Jul 2021 22:03:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237436AbhGPWGq (ORCPT ); Fri, 16 Jul 2021 18:06:46 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:14526 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S236106AbhGPWGh (ORCPT ); Fri, 16 Jul 2021 18:06:37 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 16GLWsmU178579; Fri, 16 Jul 2021 18:03:39 -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=jX3q+vq0d+05week6S3F0/wSQMjJlxTuY2TLUEtG38c=; b=bjGqUjOxvmPI1aiDpMZKAD0/9tTdH8JJzMhmIEuO2uEtzQDIMEbkdeMw1tqBBzi7Wk+q sHRf5j54RfJvBZO38LSDTz4Y4jBHDNLpik2/+RXixuW/EGhldNS1hbi2sME1BtmKPqHI RdNko1u2oojfBlcvmBSXrNxSP5yW7mJjyHj8XOhyELdS+N5SnUlb97cgSRrYKD+l2Fwm yRbGoT/nYNJx5yqiXdZdyWSarb0a2CN0AnkDvOOLeKd1G2BUZvZ7ToDGaalLsO4UaXIJ hlD8uk++gtx8EjPTJ+ChEPnWHwdu8XlfoH50dRTRwHSw1c9Vct0y1tJVRqeKZSZWAm2Y ww== Received: from ppma02wdc.us.ibm.com (aa.5b.37a9.ip4.static.sl-reverse.com [169.55.91.170]) by mx0b-001b2d01.pphosted.com with ESMTP id 39ugakb7p2-1 (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 (ppma02wdc.us.ibm.com [127.0.0.1]) by ppma02wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 16GLwWK3016408; Fri, 16 Jul 2021 22:03:38 GMT Received: from b03cxnp08026.gho.boulder.ibm.com (b03cxnp08026.gho.boulder.ibm.com [9.17.130.18]) by ppma02wdc.us.ibm.com with ESMTP id 39q36efwbq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 16 Jul 2021 22:03:38 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 16GM3bbJ22151498 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 16 Jul 2021 22:03:37 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F01D5C6061; 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 ACE4EC6055; 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 5/7] leds: pca955x: Implement the default-state property Date: Fri, 16 Jul 2021 17:03:29 -0500 Message-Id: <20210716220331.49303-6-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-GUID: pwpIOSERPG4jddETZMHxpj9KkKngmRx4 X-Proofpoint-ORIG-GUID: pwpIOSERPG4jddETZMHxpj9KkKngmRx4 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 spamscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 mlxlogscore=999 mlxscore=0 bulkscore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 phishscore=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 In order to retain the LED state after a system reboot, check the documented default-state device tree property during initialization. Modify the behavior of the probe according to the property. Signed-off-by: Eddie James --- drivers/leds/leds-pca955x.c | 54 +++++++++++++++++++++++++++++++------ 1 file changed, 46 insertions(+), 8 deletions(-) diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c index e47ba7c3b7c7..fa1d77d86ef6 100644 --- a/drivers/leds/leds-pca955x.c +++ b/drivers/leds/leds-pca955x.c @@ -129,6 +129,7 @@ struct pca955x_led { int led_num; /* 0 .. 15 potentially */ char name[32]; u32 type; + int default_state; const char *default_trigger; }; @@ -439,6 +440,7 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip) device_for_each_child_node(&client->dev, child) { const char *name; + const char *state; u32 reg; int res; @@ -457,6 +459,18 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip) fwnode_property_read_u32(child, "type", &led->type); fwnode_property_read_string(child, "linux,default-trigger", &led->default_trigger); + + if (!fwnode_property_read_string(child, "default-state", + &state)) { + if (!strcmp(state, "keep")) + led->default_state = LEDS_GPIO_DEFSTATE_KEEP; + else if (!strcmp(state, "on")) + led->default_state = LEDS_GPIO_DEFSTATE_ON; + else + led->default_state = LEDS_GPIO_DEFSTATE_OFF; + } else { + led->default_state = LEDS_GPIO_DEFSTATE_OFF; + } } pdata->num_leds = chip->bits; @@ -485,6 +499,7 @@ static int pca955x_probe(struct i2c_client *client, int i, err; struct pca955x_platform_data *pdata; int ngpios = 0; + bool keep_pwm = false; chip = &pca955x_chipdefs[id->driver_data]; adapter = client->adapter; @@ -565,14 +580,35 @@ static int pca955x_probe(struct i2c_client *client, led->brightness_set_blocking = pca955x_led_set; led->brightness_get = pca955x_led_get; + if (pdata->leds[i].default_state == + LEDS_GPIO_DEFSTATE_OFF) { + err = pca955x_led_set(led, LED_OFF); + if (err) + return err; + } else if (pdata->leds[i].default_state == + LEDS_GPIO_DEFSTATE_ON) { + err = pca955x_led_set(led, LED_FULL); + if (err) + return err; + } + err = devm_led_classdev_register(&client->dev, led); if (err) return err; - /* Turn off LED */ - err = pca955x_led_set(led, LED_OFF); - if (err) - return err; + /* + * For default-state == "keep", let the core update the + * brightness from the hardware, then check the + * brightness to see if it's using PWM1. If so, PWM1 + * should not be written below. + */ + if (pdata->leds[i].default_state == + LEDS_GPIO_DEFSTATE_KEEP) { + if (led->brightness != LED_FULL && + led->brightness != LED_OFF && + led->brightness != LED_HALF) + keep_pwm = true; + } } } @@ -581,10 +617,12 @@ static int pca955x_probe(struct i2c_client *client, if (err) return err; - /* PWM1 is used for variable brightness, default to OFF */ - err = pca955x_write_pwm(client, 1, 0); - if (err) - return err; + if (!keep_pwm) { + /* PWM1 is used for variable brightness, default to OFF */ + err = pca955x_write_pwm(client, 1, 0); + if (err) + return err; + } /* Set to fast frequency so we do not see flashing */ err = pca955x_write_psc(client, 0, 0);