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: 478639 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 7A2FEC12002 for ; Fri, 16 Jul 2021 22:03:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CCA6613F1 for ; Fri, 16 Jul 2021 22:03:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237149AbhGPWGj (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: linux-leds@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) 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: 478637 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 32660C6377A for ; 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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: linux-leds@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); From patchwork Fri Jul 16 22:03:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 478638 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 6E347C636CA for ; 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Fri, 16 Jul 2021 22:03:37 +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 22:03:37 +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 6/7] leds: pca955x: Let the core process the fwnode Date: Fri, 16 Jul 2021 17:03:30 -0500 Message-Id: <20210716220331.49303-7-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: RV9hapQ7hhX48u1LABvaUaMtE_J7ei8f X-Proofpoint-ORIG-GUID: RV9hapQ7hhX48u1LABvaUaMtE_J7ei8f 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 adultscore=0 phishscore=0 mlxscore=0 suspectscore=0 bulkscore=0 clxscore=1015 spamscore=0 impostorscore=0 priorityscore=1501 mlxlogscore=999 malwarescore=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: linux-leds@vger.kernel.org Much of the fwnode processing in the PCA955x driver is now in the LEDs core driver, so pass the fwnode in the init data when registering the LED device. In order to preserve the existing naming scheme, check for an empty name and set it to the LED number. Signed-off-by: Eddie James --- drivers/leds/leds-pca955x.c | 58 +++++++++++++++++++------------------ 1 file changed, 30 insertions(+), 28 deletions(-) diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c index fa1d77d86ef6..a6aa4b9abde8 100644 --- a/drivers/leds/leds-pca955x.c +++ b/drivers/leds/leds-pca955x.c @@ -127,10 +127,9 @@ struct pca955x_led { struct pca955x *pca955x; struct led_classdev led_cdev; int led_num; /* 0 .. 15 potentially */ - char name[32]; u32 type; int default_state; - const char *default_trigger; + struct fwnode_handle *fwnode; }; struct pca955x_platform_data { @@ -439,7 +438,6 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip) return ERR_PTR(-ENOMEM); device_for_each_child_node(&client->dev, child) { - const char *name; const char *state; u32 reg; int res; @@ -448,17 +446,10 @@ pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip) if ((res != 0) || (reg >= chip->bits)) continue; - res = fwnode_property_read_string(child, "label", &name); - if ((res != 0) && is_of_node(child)) - name = to_of_node(child)->name; - led = &pdata->leds[reg]; - snprintf(led->name, sizeof(led->name), "%s", name); - led->type = PCA955X_TYPE_LED; + led->fwnode = child; 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)) { @@ -495,11 +486,14 @@ static int pca955x_probe(struct i2c_client *client, struct pca955x_led *pca955x_led; struct pca955x_chipdef *chip; struct led_classdev *led; + struct led_init_data init_data; struct i2c_adapter *adapter; int i, err; struct pca955x_platform_data *pdata; int ngpios = 0; + bool set_default_label = false; bool keep_pwm = false; + char default_label[8]; chip = &pca955x_chipdefs[id->driver_data]; adapter = client->adapter; @@ -547,6 +541,9 @@ static int pca955x_probe(struct i2c_client *client, pca955x->client = client; pca955x->chipdef = chip; + init_data.devname_mandatory = false; + init_data.devicename = "pca955x"; + for (i = 0; i < chip->bits; i++) { pca955x_led = &pca955x->leds[i]; pca955x_led->led_num = i; @@ -560,23 +557,7 @@ static int pca955x_probe(struct i2c_client *client, ngpios++; break; case PCA955X_TYPE_LED: - /* - * Platform data can specify LED names and - * default triggers - */ - if (pdata->leds[i].name[0] == '\0') - snprintf(pdata->leds[i].name, - sizeof(pdata->leds[i].name), "%d", i); - - snprintf(pca955x_led->name, sizeof(pca955x_led->name), - "pca955x:%s", pdata->leds[i].name); - led = &pca955x_led->led_cdev; - if (pdata->leds[i].default_trigger) - led->default_trigger = - pdata->leds[i].default_trigger; - - led->name = pca955x_led->name; led->brightness_set_blocking = pca955x_led_set; led->brightness_get = pca955x_led_get; @@ -592,7 +573,28 @@ static int pca955x_probe(struct i2c_client *client, return err; } - err = devm_led_classdev_register(&client->dev, led); + init_data.fwnode = pdata->leds[i].fwnode; + + if (is_of_node(init_data.fwnode)) { + if (to_of_node(init_data.fwnode)->name[0] == + '\0') + set_default_label = true; + else + set_default_label = false; + } else { + set_default_label = true; + } + + if (set_default_label) { + snprintf(default_label, sizeof(default_label), + "%d", i); + init_data.default_label = default_label; + } else { + init_data.default_label = NULL; + } + + err = devm_led_classdev_register_ext(&client->dev, led, + &init_data); if (err) return err;