From patchwork Tue Jun 4 17:43:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Murphy X-Patchwork-Id: 165807 Delivered-To: patch@linaro.org Received: by 2002:a92:9e1a:0:0:0:0:0 with SMTP id q26csp6160272ili; Tue, 4 Jun 2019 10:44:14 -0700 (PDT) X-Google-Smtp-Source: APXvYqyUHxwXeliIw7/Zeav5WGM5hcs4TPRX1SVZ338DduNURXQXzos+xXOIUKxIW7ufKdr1M/dA X-Received: by 2002:a65:6495:: with SMTP id e21mr36214936pgv.383.1559670254520; Tue, 04 Jun 2019 10:44:14 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1559670254; cv=none; d=google.com; s=arc-20160816; b=PnJylB2ldYz4Deffw5hQJHZ82mCSyh2pr6mLNODD9xFlLDTRqKcyGq2VGVYjJMjuh0 nLU0NQybvBMXf44C4TWpx19oZ4hssKo611SNiFcRAmWY7Dn6HTLwjeFUUR/ixIdkTjRv co8kI7P+WFcncif92IzIVxDrYtFiqy4TlXpNCvUpFF/ThoPNt6R7xRE7bK8MhPPMMjYl 8LpTaIUw80uYzDLSlEv744IJGLo2csCKXB/oGXk7IOjF8Sw9dCBZw8clLq6Gmuby2/BY Jp1SSzeBj+moyuzjTpqWrn9GJm17hmAlmN+0wfS9RlslrIBVer9TWkoHHcr/qhV20F5C oYiQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=fDHnhJLBG1WGvVdCW+tFwYvr1TQ8gB7ikNstQuuRzTE=; b=TQcnTGhz/I2s3sGTgeZvRm3sxW2EZqgxAfXJbIm98qDY010hD2tHRZ4GThQ3jp2Ie+ Z0akYZuJs8+ITt7KW8itMzy+YP0fOBi8QRmxYUcBspd9HUvqMCc/6uvdtpqZbDV/kUnc neJhNnctT1PYegAzXQYy9zD5LhhRSS80NIYJYwGlZTHaeZcTmVktIfiHhwCx1fZ8+L31 dtgsfqEAH7uI1xt7OkY6bSsJ4/csXOSaIu4Z+zly4bg7HdktXkCg1Z7+0nZmrGafs7Au abfTmqGLbLU/Oq6MxYYnmO9le+o8eJLXP+TbjxBC+noWspaZbnumKSMKm8Y63z3xD+Id F/ow== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=qpPmWOup; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 99si24956963pla.397.2019.06.04.10.44.14; Tue, 04 Jun 2019 10:44:14 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=qpPmWOup; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=QUARANTINE sp=NONE dis=NONE) header.from=ti.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726795AbfFDRoN (ORCPT + 30 others); Tue, 4 Jun 2019 13:44:13 -0400 Received: from fllv0016.ext.ti.com ([198.47.19.142]:53254 "EHLO fllv0016.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726605AbfFDRnz (ORCPT ); Tue, 4 Jun 2019 13:43:55 -0400 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id x54HhpJL018142; Tue, 4 Jun 2019 12:43:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1559670231; bh=fDHnhJLBG1WGvVdCW+tFwYvr1TQ8gB7ikNstQuuRzTE=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=qpPmWOupFm2IfSi3WBmfTudR5/5TF5PVw0hy/XQT0GNaeps83BBdzi0eWqHCOSaJz 9WOwsGSfJ59Ny7NevIkp0yfnBdVAzj6jYTDBEtRIk+ZyCd0B2J46m3gCQWfqXZkDhV RVmQFi+rsWGdw4oSxgrrl1BGXWfq7A1Fo2qZQzts= Received: from DLEE110.ent.ti.com (dlee110.ent.ti.com [157.170.170.21]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x54HhpOh057703 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 4 Jun 2019 12:43:51 -0500 Received: from DLEE106.ent.ti.com (157.170.170.36) by DLEE110.ent.ti.com (157.170.170.21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Tue, 4 Jun 2019 12:43:49 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE106.ent.ti.com (157.170.170.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Tue, 4 Jun 2019 12:43:49 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id x54Hhnul093804; Tue, 4 Jun 2019 12:43:49 -0500 From: Dan Murphy To: , , , CC: , , , Dan Murphy Subject: [PATCH v5 6/6] leds: lm36274: Introduce the TI LM36274 LED driver Date: Tue, 4 Jun 2019 12:43:45 -0500 Message-ID: <20190604174345.14841-7-dmurphy@ti.com> X-Mailer: git-send-email 2.21.0.5.gaeb582a983 In-Reply-To: <20190604174345.14841-1-dmurphy@ti.com> References: <20190604174345.14841-1-dmurphy@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce the LM36274 LED driver. This driver uses the ti-lmu MFD driver to probe this LED driver. The driver configures only the LED registers and enables the outputs according to the config file. The driver utilizes the TI LMU (Lighting Management Unit) LED common framework to set the brightness bits. Signed-off-by: Dan Murphy Signed-off-by: Jacek Anaszewski --- v5 - No changes drivers/leds/Kconfig | 8 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-lm36274.c | 174 ++++++++++++++++++++++++++++++++++++ 3 files changed, 183 insertions(+) create mode 100644 drivers/leds/leds-lm36274.c -- 2.21.0.5.gaeb582a983 diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 91cb047059a0..61c585049b2d 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -798,6 +798,14 @@ config LEDS_LM3697 Say Y to enable the LM3697 LED driver for TI LMU devices. This supports the LED device LM3697. +config LEDS_LM36274 + tristate "LED driver for LM36274" + depends on LEDS_TI_LMU_COMMON + depends on MFD_TI_LMU + help + Say Y to enable the LM36274 LED driver for TI LMU devices. + This supports the LED device LM36274. + comment "LED Triggers" source "drivers/leds/trigger/Kconfig" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 6c3350404ede..c52934732c1a 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -83,6 +83,7 @@ obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o obj-$(CONFIG_LEDS_LM3601X) += leds-lm3601x.o obj-$(CONFIG_LEDS_TI_LMU_COMMON) += leds-ti-lmu-common.o obj-$(CONFIG_LEDS_LM3697) += leds-lm3697.o +obj-$(CONFIG_LEDS_LM36274) += leds-lm36274.o # LED SPI Drivers obj-$(CONFIG_LEDS_CR0014114) += leds-cr0014114.o diff --git a/drivers/leds/leds-lm36274.c b/drivers/leds/leds-lm36274.c new file mode 100644 index 000000000000..b47786d36d21 --- /dev/null +++ b/drivers/leds/leds-lm36274.c @@ -0,0 +1,174 @@ +// SPDX-License-Identifier: GPL-2.0 +// TI LM36274 LED chip family driver +// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include + +#define LM36274_MAX_STRINGS 4 +#define LM36274_BL_EN BIT(4) + +/** + * struct lm36274 + * @pdev: platform device + * @led_dev: led class device + * @lmu_data: Register and setting values for common code + * @regmap: Devices register map + * @dev: Pointer to the devices device struct + * @led_sources - The LED strings supported in this array + * @num_leds - Number of LED strings are supported in this array + */ +struct lm36274 { + struct platform_device *pdev; + struct led_classdev led_dev; + struct ti_lmu_bank lmu_data; + struct regmap *regmap; + struct device *dev; + + u32 led_sources[LM36274_MAX_STRINGS]; + int num_leds; +}; + +static int lm36274_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brt_val) +{ + struct lm36274 *led = container_of(led_cdev, struct lm36274, led_dev); + + return ti_lmu_common_set_brightness(&led->lmu_data, brt_val); +} + +static int lm36274_init(struct lm36274 *lm36274_data) +{ + int enable_val = 0; + int i; + + for (i = 0; i < lm36274_data->num_leds; i++) + enable_val |= (1 << lm36274_data->led_sources[i]); + + if (!enable_val) { + dev_err(lm36274_data->dev, "No LEDs were enabled\n"); + return -EINVAL; + } + + enable_val |= LM36274_BL_EN; + + return regmap_write(lm36274_data->regmap, LM36274_REG_BL_EN, + enable_val); +} + +static int lm36274_parse_dt(struct lm36274 *lm36274_data) +{ + struct fwnode_handle *child = NULL; + char label[LED_MAX_NAME_SIZE]; + struct device *dev = &lm36274_data->pdev->dev; + const char *name; + int child_cnt; + int ret = -EINVAL; + + /* There should only be 1 node */ + child_cnt = device_get_child_node_count(dev); + if (child_cnt != 1) + return ret; + + device_for_each_child_node(dev, child) { + ret = fwnode_property_read_string(child, "label", &name); + if (ret) + snprintf(label, sizeof(label), + "%s::", lm36274_data->pdev->name); + else + snprintf(label, sizeof(label), + "%s:%s", lm36274_data->pdev->name, name); + + lm36274_data->num_leds = fwnode_property_read_u32_array(child, + "led-sources", + NULL, 0); + if (lm36274_data->num_leds <= 0) + return -ENODEV; + + ret = fwnode_property_read_u32_array(child, "led-sources", + lm36274_data->led_sources, + lm36274_data->num_leds); + if (ret) { + dev_err(dev, "led-sources property missing\n"); + return -EINVAL; + } + + fwnode_property_read_string(child, "linux,default-trigger", + &lm36274_data->led_dev.default_trigger); + + } + + lm36274_data->lmu_data.regmap = lm36274_data->regmap; + lm36274_data->lmu_data.max_brightness = MAX_BRIGHTNESS_11BIT; + lm36274_data->lmu_data.msb_brightness_reg = LM36274_REG_BRT_MSB; + lm36274_data->lmu_data.lsb_brightness_reg = LM36274_REG_BRT_LSB; + + lm36274_data->led_dev.name = label; + lm36274_data->led_dev.max_brightness = MAX_BRIGHTNESS_11BIT; + lm36274_data->led_dev.brightness_set_blocking = lm36274_brightness_set; + + return ret; +} + +static int lm36274_probe(struct platform_device *pdev) +{ + struct ti_lmu *lmu = dev_get_drvdata(pdev->dev.parent); + struct lm36274 *lm36274_data; + int ret; + + lm36274_data = devm_kzalloc(&pdev->dev, sizeof(*lm36274_data), + GFP_KERNEL); + if (!lm36274_data) { + ret = -ENOMEM; + return ret; + } + + lm36274_data->pdev = pdev; + lm36274_data->dev = lmu->dev; + lm36274_data->regmap = lmu->regmap; + dev_set_drvdata(&pdev->dev, lm36274_data); + + ret = lm36274_parse_dt(lm36274_data); + if (ret) { + dev_err(lm36274_data->dev, "Failed to parse DT node\n"); + return ret; + } + + ret = lm36274_init(lm36274_data); + if (ret) { + dev_err(lm36274_data->dev, "Failed to init the device\n"); + return ret; + } + + return devm_led_classdev_register(lm36274_data->dev, + &lm36274_data->led_dev); +} + +static const struct of_device_id of_lm36274_leds_match[] = { + { .compatible = "ti,lm36274-backlight", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_lm36274_leds_match); + +static struct platform_driver lm36274_driver = { + .probe = lm36274_probe, + .driver = { + .name = "lm36274-leds", + }, +}; +module_platform_driver(lm36274_driver) + +MODULE_DESCRIPTION("Texas Instruments LM36274 LED driver"); +MODULE_AUTHOR("Dan Murphy "); +MODULE_LICENSE("GPL v2");