From patchwork Tue Nov 28 20:40:20 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Murphy X-Patchwork-Id: 119902 Delivered-To: patch@linaro.org Received: by 10.140.22.227 with SMTP id 90csp2193280qgn; Tue, 28 Nov 2017 12:41:04 -0800 (PST) X-Google-Smtp-Source: AGs4zMaItqrVnaAhSrxHb34Sls039PEmbFx39266qS/6tWbT2Wfu5xzff98tmbx2YkHHCCtnPLRa X-Received: by 10.84.169.4 with SMTP id g4mr389886plb.393.1511901664540; Tue, 28 Nov 2017 12:41:04 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1511901664; cv=none; d=google.com; s=arc-20160816; b=nDi+V7DSNdOmUdl03ZMw5Evz6sryhGGE0HFQsoRBjOTejdckrF5IWlDd4JSc8M2VwX oticZGzjQgA8WK7sCvIPAu/SSUNQfd9sJzRTgmDoDNAAYNjuA8NC4TvtsrTfzhQSwe/e 6HVZAv9ZXhnKA5y2EGfO+EVkBshLTrGKCNAE2Loz3PHCwIqshzCBpPJc7e9U0mRE6ClO ou++b+rickD3SYWRzC29qtBU+STZ7iKEwcmYvVAUxwMsxoan9BymGr8D1IRDujoNScAE axmXuRE+b3nHUZ6cwB+5JjuFFFGjyj74w3bXHQjoOUoHwTfjaJ5cpCbB1auJRNJ12NgS Pnng== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:message-id:date:subject:cc :to:from:dkim-signature:arc-authentication-results; bh=2Wsax0E9XcF6rQm17EIqGLSHioms+qJU2yf1Gu4v0zQ=; b=p4TRVutxT5pACLCP5c3bu/Na+m2sFksvSzb0UYz8W/zU5ycJ3Xwkh/NjRlqLumLUfm /Q8KNLEdiLPPYVCqBL3jSTusxoFpEtWyyfVHAamszNmK5re9O56zK7gluvDdroZvJwGo k7FW7ePJ+viKgo0TmDbOohO5KcqDgz8Kbv6VsRiYWzvc+lapYbe25A88onNPAmPCMFoW PnJmz75MqSzWUmSl52FwReJiK7n/WWwbILM6Mlw2eiROHfQifQAy+d4XQD6Opewz6Z+J WiCpk81l5bsdqmy2T6xGzvrZ+PdjG60/VzZ3WNvk4MEWVcm64OeF2Qd/Bxv50qrG4GHN G4Vg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=R//ee/Kk; 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 m1si11330pld.808.2017.11.28.12.41.04; Tue, 28 Nov 2017 12:41:04 -0800 (PST) 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=R//ee/Kk; 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 S932289AbdK1Uk4 (ORCPT + 28 others); Tue, 28 Nov 2017 15:40:56 -0500 Received: from lelnx194.ext.ti.com ([198.47.27.80]:47906 "EHLO lelnx194.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754320AbdK1Ukf (ORCPT ); Tue, 28 Nov 2017 15:40:35 -0500 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by lelnx194.ext.ti.com (8.15.1/8.15.1) with ESMTP id vASKeN67011050; Tue, 28 Nov 2017 14:40:23 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1511901623; bh=0s1c9zaeGoVHPPOmBs9o1m4xeIxYpiuh3c7PMRGPkZk=; h=From:To:CC:Subject:Date; b=R//ee/KkW+vGyEEhkHTJOuqvrj0+MXYiDDUitms8Y2CF5QxuqmrR3HpdZLbK92dL9 nihxD0+JIBs4yUQQNRqoVeHQ8zFrb6WkFyDPCOjZrAdg8UEtIBJaSm3EP6Xx0n3/fz 9v1AqnMXHmREfggNifbkFWKYAmLmUCiQm7wBj1j8= Received: from DFLE115.ent.ti.com (dfle115.ent.ti.com [10.64.6.36]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id vASKeNT5029239; Tue, 28 Nov 2017 14:40:23 -0600 Received: from DFLE100.ent.ti.com (10.64.6.21) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.845.34; Tue, 28 Nov 2017 14:40:22 -0600 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE100.ent.ti.com (10.64.6.21) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.845.34 via Frontend Transport; Tue, 28 Nov 2017 14:40:22 -0600 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id vASKeMQi026855; Tue, 28 Nov 2017 14:40:22 -0600 Received: from localhost (a0272616local-lt.dhcp.ti.com [172.22.160.127]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id vASKeM322735; Tue, 28 Nov 2017 14:40:22 -0600 (CST) From: Dan Murphy To: , , CC: , , Dan Murphy Subject: [PATCH v4 1/2] dt: bindings: lm3692x: Add bindings for lm3692x LED driver Date: Tue, 28 Nov 2017 14:40:20 -0600 Message-ID: <20171128204021.12699-1-dmurphy@ti.com> X-Mailer: git-send-email 2.12.2 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 This adds the devicetree bindings for the LM3692x I2C LED string driver. Acked-by: Pavel Machek Signed-off-by: Dan Murphy --- v4 - Fix example node, added trigger entry, removed ambiguous x for compatible and added common.txt pointer for label - https://patchwork.kernel.org/patch/10060107 v3 - No changes v2 - No changes - https://patchwork.kernel.org/patch/10056677/ .../devicetree/bindings/leds/leds-lm3692x.txt | 39 ++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/leds-lm3692x.txt -- 2.15.0.124.g7668cbc60 diff --git a/Documentation/devicetree/bindings/leds/leds-lm3692x.txt b/Documentation/devicetree/bindings/leds/leds-lm3692x.txt new file mode 100644 index 000000000000..c259cde2226f --- /dev/null +++ b/Documentation/devicetree/bindings/leds/leds-lm3692x.txt @@ -0,0 +1,39 @@ +* Texas Instruments - LM3692x Highly Efficient White LED Driver + +The LM3692x is an ultra-compact, highly efficient, +white-LED driver designed for LCD display backlighting. + +The main difference between the LM36922 and LM36923 is the number of +LED strings it supports. The LM36922 supports two strings while the LM36923 +supports three strings. + +Required properties: + - compatible: + "ti,lm36922" + "ti,lm36923" + - reg : I2C slave address + +Optional properties: + - label : see Documentation/devicetree/bindings/leds/common.txt + - enable-gpios : gpio pin to enable/disable the device. + - vled-supply : LED supply + - linux,default-trigger : (optional) + see Documentation/devicetree/bindings/leds/common.txt + +Example: + +lm3692x@36 { + compatible = "ti,lm3692x"; + reg = <0x36>; + + enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>; + vled-supply = <&vbatt>; + + backlight: backlight@0 { + label = "backlight_cluster"; + linux,default-trigger = "backlight"; + }; +} + +For more product information please see the link below: +http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf From patchwork Tue Nov 28 20:40:21 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Murphy X-Patchwork-Id: 119903 Delivered-To: patch@linaro.org Received: by 10.140.22.227 with SMTP id 90csp2193618qgn; Tue, 28 Nov 2017 12:41:27 -0800 (PST) X-Google-Smtp-Source: AGs4zMYHnRh2iI0kSEAizf1jOUWI6KzNnQRXZuK5o/e5S3jkKn5Imr+V60xJnLBR8HaLow75LTef X-Received: by 10.98.18.88 with SMTP id a85mr407311pfj.141.1511901686960; Tue, 28 Nov 2017 12:41:26 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1511901686; cv=none; d=google.com; s=arc-20160816; b=Tiy7/vANhcO55qq6YgqFkoUII/8Kxn1d9dGQrflbzb4xw9trjHi3ZnKpogSXWjx3yU Z+fRGddXuzYbCeQsLR+xzwa9hj0tNpn/s7NZn5MQkHuvgGgi74vPyQTCDco9NTS3xicg XVlpHqULhYi+zqTJWrMqzIwnFBSWT4ASw95NuCCIOyPTA9X3bCm4KR4/koC1uF3s1+8D ei0vUBmNgOH4EksHvLg4CehdPCCiurKxeMWLyZjNsMQZRXOAzZkDarX1oFzhpI9ZZgmb tfdDkVjwjuV3bBjwVgnLsuONoZq+E9YcvUNiYFvfn8aWsV46hrorbMwkAa0AF0j2sP0S bWFQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:dkim-signature :arc-authentication-results; bh=AT+gAZNDjezMIdXCtCTrlW+nlTIkp2B/tlcaLwLAIa4=; b=Q6XCL3HHJM56F3EjeLDpxe1buRlqzfGM0Np0tCvPSChlv3thYxhotY2PNm9gHPikAu nTJ6Fh6zvvV0HYpRa4SjWF/LaBBGatePFVfsproH6UV50UnPeULpr9S9j49tH8/fL1hR YSsin4FJw+PwybUSB5nl5uvaEXYsHB4RQt6VglyX/Mup+UNrKU0vuWsur32KnWlSYRt/ b1qsPPOY8MNxKrlABTNX3PgkKltrax5HvMGlCnCiCkzEW8ep46rSM+BeaPFpzH2vG6Le dpd1NdnPpUbUQfYQZxi3ifasTzGU+Om71OhFFbMKsfEJlYZ+78+K7zHpyl535YuP7EJF H/1A== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ti.com header.s=ti-com-17Q1 header.b=nLF1yg84; 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 e21si20019pgv.726.2017.11.28.12.41.26; Tue, 28 Nov 2017 12:41:26 -0800 (PST) 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=nLF1yg84; 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 S932346AbdK1UlY (ORCPT + 28 others); Tue, 28 Nov 2017 15:41:24 -0500 Received: from fllnx209.ext.ti.com ([198.47.19.16]:39800 "EHLO fllnx209.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932326AbdK1UlV (ORCPT ); Tue, 28 Nov 2017 15:41:21 -0500 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by fllnx209.ext.ti.com (8.15.1/8.15.1) with ESMTP id vASKeTmW030274; Tue, 28 Nov 2017 14:40:29 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1511901629; bh=iG93fQ/tsZy7HalzfNQLVl7ds2Orsb/GeF41foE2RuA=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=nLF1yg842kBzLVJS2teAy2N916++9RFBKoqv0WuX4XIeuQZjOZN5NY5qKv0noh6E5 qqrZAQL7I7+j+gME5Ki3KlKDrDH4VZVejawOdvKmuxHLEYILlbMgXvmYtjjSOb5lIK t6w25+HRoL9ZKRiGGCqPAqqZQNC49Dx3Lj8trtSc= Received: from DFLE115.ent.ti.com (dfle115.ent.ti.com [10.64.6.36]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id vASKeOcx024601; Tue, 28 Nov 2017 14:40:24 -0600 Received: from DFLE108.ent.ti.com (10.64.6.29) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.845.34; Tue, 28 Nov 2017 14:40:23 -0600 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE108.ent.ti.com (10.64.6.29) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.845.34 via Frontend Transport; Tue, 28 Nov 2017 14:40:23 -0600 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id vASKeN9k026872; Tue, 28 Nov 2017 14:40:23 -0600 Received: from localhost (a0272616local-lt.dhcp.ti.com [172.22.160.127]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id vASKeN322739; Tue, 28 Nov 2017 14:40:23 -0600 (CST) From: Dan Murphy To: , , CC: , , Dan Murphy Subject: [PATCH v4 2/2] leds: lm3692x: Introduce LM3692x dual string driver Date: Tue, 28 Nov 2017 14:40:21 -0600 Message-ID: <20171128204021.12699-2-dmurphy@ti.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20171128204021.12699-1-dmurphy@ti.com> References: <20171128204021.12699-1-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 Introducing the LM3692x Dual-String white LED driver. Data sheet is located http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf Signed-off-by: Dan Murphy --- v4 - Converted to devm led class register, changed MODULE_LICENSE to GPL v2, set the led name based on child node name or label entry, removed fault and returned read_buf for fault checking, added mutex_destroy to remove function, and removed LED_FULL - https://patchwork.kernel.org/patch/10060109/ v3 - Add missing Makefile and Kconfig from v1 and v2 - https://patchwork.kernel.org/patch/10060075/ v2 - Added data sheet link, fixed linuxdoc format, returned on failure in init routine, return on fault_check failure, updated brightness calculation and fixed capitalization issue - https://patchwork.kernel.org/patch/10056675/ drivers/leds/Kconfig | 7 + drivers/leds/Makefile | 1 + drivers/leds/leds-lm3692x.c | 382 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 390 insertions(+) create mode 100644 drivers/leds/leds-lm3692x.c -- 2.15.0.124.g7668cbc60 diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 318a28fd58fe..c0583f1bc8ea 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -137,6 +137,13 @@ config LEDS_LM3642 converter plus 1.5A constant current driver for a high-current white LED. +config LEDS_LM3692X + tristate "LED support for LM3692x Chips" + depends on LEDS_CLASS && I2C + select REGMAP_I2C + help + This option enables support for the TI LM3692x family + of white LED string drivers used for backlighting. config LEDS_LOCOMO tristate "LED Support for Locomo device" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index a2a6b5a4f86d..987884a5b9a5 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -74,6 +74,7 @@ obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o obj-$(CONFIG_LEDS_MLXCPLD) += leds-mlxcpld.o obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o +obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c new file mode 100644 index 000000000000..fcf0573fb985 --- /dev/null +++ b/drivers/leds/leds-lm3692x.c @@ -0,0 +1,382 @@ +/* + * TI lm3692x LED Driver + * + * Copyright (C) 2017 Texas Instruments + * + * Author: Dan Murphy + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * Data sheet is located + * http://www.ti.com/lit/ds/snvsa29/snvsa29.pdf + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define LM3692X_REV 0x0 +#define LM3692X_RESET 0x1 +#define LM3692X_EN 0x10 +#define LM3692X_BRT_CTRL 0x11 +#define LM3692X_PWM_CTRL 0x12 +#define LM3692X_BOOST_CTRL 0x13 +#define LM3692X_AUTO_FREQ_HI 0x15 +#define LM3692X_AUTO_FREQ_LO 0x16 +#define LM3692X_BL_ADJ_THRESH 0x17 +#define LM3692X_BRT_LSB 0x18 +#define LM3692X_BRT_MSB 0x19 +#define LM3692X_FAULT_CTRL 0x1e +#define LM3692X_FAULT_FLAGS 0x1f + +#define LM3692X_SW_RESET BIT(0) +#define LM3692X_DEVICE_EN BIT(0) +#define LM3692X_LED1_EN BIT(1) +#define LM3692X_LED2_EN BIT(2) + +/* Brightness Control Bits */ +#define LM3692X_BL_ADJ_POL BIT(0) +#define LM3692X_RAMP_RATE_125us 0x00 +#define LM3692X_RAMP_RATE_250us BIT(1) +#define LM3692X_RAMP_RATE_500us BIT(2) +#define LM3692X_RAMP_RATE_1ms (BIT(1) | BIT(2)) +#define LM3692X_RAMP_RATE_2ms BIT(3) +#define LM3692X_RAMP_RATE_4ms (BIT(3) | BIT(1)) +#define LM3692X_RAMP_RATE_8ms (BIT(2) | BIT(3)) +#define LM3692X_RAMP_RATE_16ms (BIT(1) | BIT(2) | BIT(3)) +#define LM3692X_RAMP_EN BIT(4) +#define LM3692X_BRHT_MODE_REG 0x00 +#define LM3692X_BRHT_MODE_PWM BIT(5) +#define LM3692X_BRHT_MODE_MULTI_RAMP BIT(6) +#define LM3692X_BRHT_MODE_RAMP_MULTI (BIT(5) | BIT(6)) +#define LM3692X_MAP_MODE_EXP BIT(7) + +/* PWM Register Bits */ +#define LM3692X_PWM_FILTER_100 BIT(0) +#define LM3692X_PWM_FILTER_150 BIT(1) +#define LM3692X_PWM_FILTER_200 (BIT(0) | BIT(1)) +#define LM3692X_PWM_HYSTER_1LSB BIT(2) +#define LM3692X_PWM_HYSTER_2LSB BIT(3) +#define LM3692X_PWM_HYSTER_3LSB (BIT(3) | BIT(2)) +#define LM3692X_PWM_HYSTER_4LSB BIT(4) +#define LM3692X_PWM_HYSTER_5LSB (BIT(4) | BIT(2)) +#define LM3692X_PWM_HYSTER_6LSB (BIT(4) | BIT(3)) +#define LM3692X_PWM_POLARITY BIT(5) +#define LM3692X_PWM_SAMP_4MHZ BIT(6) +#define LM3692X_PWM_SAMP_24MHZ BIT(7) + +/* Boost Control Bits */ +#define LM3692X_OCP_PROT_1A BIT(0) +#define LM3692X_OCP_PROT_1_25A BIT(1) +#define LM3692X_OCP_PROT_1_5A (BIT(0) | BIT(1)) +#define LM3692X_OVP_21V BIT(2) +#define LM3692X_OVP_25V BIT(3) +#define LM3692X_OVP_29V (BIT(2) | BIT(3)) +#define LM3692X_MIN_IND_22UH BIT(4) +#define LM3692X_BOOST_SW_1MHZ BIT(5) +#define LM3692X_BOOST_SW_NO_SHIFT BIT(6) + +/* Fault Control Bits */ +#define LM3692X_FAULT_CTRL_OVP BIT(0) +#define LM3692X_FAULT_CTRL_OCP BIT(1) +#define LM3692X_FAULT_CTRL_TSD BIT(2) +#define LM3692X_FAULT_CTRL_OPEN BIT(3) + +/* Fault Flag Bits */ +#define LM3692X_FAULT_FLAG_OVP BIT(0) +#define LM3692X_FAULT_FLAG_OCP BIT(1) +#define LM3692X_FAULT_FLAG_TSD BIT(2) +#define LM3692X_FAULT_FLAG_SHRT BIT(3) +#define LM3692X_FAULT_FLAG_OPEN BIT(4) + +/** + * struct lm3692x_led - + * @lock - Lock for reading/writing the device + * @client - Pointer to the I2C client + * @led_dev - led class device pointer + * @regmap - Devices register map + * @enable_gpio - VDDIO/EN gpio to enable communication interface + * @regulator - LED supply regulator pointer + * @label - LED label + */ +struct lm3692x_led { + struct mutex lock; + struct i2c_client *client; + struct led_classdev led_dev; + struct regmap *regmap; + struct gpio_desc *enable_gpio; + struct regulator *regulator; + const char *label; +}; + +static const struct reg_default lm3692x_reg_defs[] = { + {LM3692X_EN, 0xf}, + {LM3692X_BRT_CTRL, 0x61}, + {LM3692X_PWM_CTRL, 0x73}, + {LM3692X_BOOST_CTRL, 0x6f}, + {LM3692X_AUTO_FREQ_HI, 0x0}, + {LM3692X_AUTO_FREQ_LO, 0x0}, + {LM3692X_BL_ADJ_THRESH, 0x0}, + {LM3692X_BRT_LSB, 0x7}, + {LM3692X_BRT_MSB, 0xff}, + {LM3692X_FAULT_CTRL, 0x7}, +}; + +static const struct regmap_config lm3692x_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = LM3692X_FAULT_FLAGS, + .reg_defaults = lm3692x_reg_defs, + .num_reg_defaults = ARRAY_SIZE(lm3692x_reg_defs), + .cache_type = REGCACHE_RBTREE, +}; + +static int lm3692x_fault_check(struct lm3692x_led *led) +{ + int ret; + unsigned int read_buf; + + ret = regmap_read(led->regmap, LM3692X_FAULT_FLAGS, &read_buf); + if (ret) + return ret; + + if (read_buf) + dev_err(&led->client->dev, "Detected a fault 0x%X\n", + read_buf); + + return read_buf; +} + +static int lm3692x_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brt_val) +{ + struct lm3692x_led *led = + container_of(led_cdev, struct lm3692x_led, led_dev); + int ret; + int led_brightness_lsb = (brt_val >> 5); + + mutex_lock(&led->lock); + + ret = lm3692x_fault_check(led); + if (ret) { + dev_err(&led->client->dev, "Cannot read/clear faults\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_MSB, brt_val); + if (ret) { + dev_err(&led->client->dev, "Cannot write MSB\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_LSB, led_brightness_lsb); + if (ret) { + dev_err(&led->client->dev, "Cannot write LSB\n"); + goto out; + } +out: + mutex_unlock(&led->lock); + return ret; +} + +static int lm3692x_init(struct lm3692x_led *led) +{ + int ret; + + if (led->regulator) { + ret = regulator_enable(led->regulator); + if (ret) { + dev_err(&led->client->dev, + "Failed to enable regulator\n"); + return ret; + } + } + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 1); + + ret = lm3692x_fault_check(led); + if (ret) { + dev_err(&led->client->dev, "Cannot read/clear faults\n"); + goto out; + } + + ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, 0x00); + if (ret) + goto out; + + /* + * For glitch free operation, the following data should + * only be written while device enable bit is 0 + * per Section 7.5.14 of the data sheet + */ + ret = regmap_write(led->regmap, LM3692X_PWM_CTRL, + LM3692X_PWM_FILTER_100 | LM3692X_PWM_SAMP_24MHZ); + if (ret) + goto out; + + ret = regmap_write(led->regmap, LM3692X_BOOST_CTRL, + LM3692X_BRHT_MODE_RAMP_MULTI | + LM3692X_BL_ADJ_POL | + LM3692X_RAMP_RATE_250us); + if (ret) + goto out; + + ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_HI, 0x00); + if (ret) + goto out; + + ret = regmap_write(led->regmap, LM3692X_AUTO_FREQ_LO, 0x00); + if (ret) + goto out; + + ret = regmap_write(led->regmap, LM3692X_BL_ADJ_THRESH, 0x00); + if (ret) + goto out; + + ret = regmap_write(led->regmap, LM3692X_BRT_CTRL, + LM3692X_BL_ADJ_POL | LM3692X_PWM_HYSTER_4LSB); + if (ret) + goto out; + + return ret; +out: + dev_err(&led->client->dev, "Fail writing initialization values\n"); + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 0); + + if (led->regulator) { + ret = regulator_disable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to disable regulator\n"); + } + + return ret; +} + +static int lm3692x_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + int ret; + struct lm3692x_led *led; + struct device_node *np = client->dev.of_node; + struct device_node *child_node; + + led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL); + if (!led) + return -ENOMEM; + + for_each_available_child_of_node(np, child_node) { + led->led_dev.name = of_get_property(child_node, "label", NULL) ? : + child_node->name; + + led->led_dev.default_trigger = of_get_property(child_node, + "linux,default-trigger", + NULL); + }; + + led->enable_gpio = devm_gpiod_get_optional(&client->dev, + "enable", GPIOD_OUT_LOW); + if (IS_ERR(led->enable_gpio)) { + ret = PTR_ERR(led->enable_gpio); + dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret); + return ret; + } + + led->regulator = devm_regulator_get(&client->dev, "vled"); + if (IS_ERR(led->regulator)) + led->regulator = NULL; + + led->client = client; + led->led_dev.brightness_set_blocking = lm3692x_brightness_set; + + mutex_init(&led->lock); + + i2c_set_clientdata(client, led); + + led->regmap = devm_regmap_init_i2c(client, &lm3692x_regmap_config); + if (IS_ERR(led->regmap)) { + ret = PTR_ERR(led->regmap); + dev_err(&client->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + ret = lm3692x_init(led); + if (ret) + return ret; + + ret = devm_led_classdev_register(&client->dev, &led->led_dev); + if (ret) { + dev_err(&client->dev, "led register err: %d\n", ret); + return ret; + } + + return 0; +} + +static int lm3692x_remove(struct i2c_client *client) +{ + struct lm3692x_led *led = i2c_get_clientdata(client); + int ret; + + led_classdev_unregister(&led->led_dev); + + if (led->enable_gpio) + gpiod_direction_output(led->enable_gpio, 0); + + if (led->regulator) { + ret = regulator_disable(led->regulator); + if (ret) + dev_err(&led->client->dev, + "Failed to disable regulator\n"); + } + + mutex_destroy(&led->lock); + + return 0; +} + +static const struct i2c_device_id lm3692x_id[] = { + { "lm36922", 0 }, + { "lm36923", 1 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm3692x_id); + +#ifdef CONFIG_OF +static const struct of_device_id of_lm3692x_leds_match[] = { + { .compatible = "ti,lm36922", }, + { .compatible = "ti,lm36923", }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_lm3692x_leds_match); +#endif + +static struct i2c_driver lm3692x_driver = { + .driver = { + .name = "lm3692x", + .of_match_table = of_match_ptr(of_lm3692x_leds_match), + }, + .probe = lm3692x_probe, + .remove = lm3692x_remove, + .id_table = lm3692x_id, +}; +module_i2c_driver(lm3692x_driver); + +MODULE_DESCRIPTION("Texas Instruments LM3692X LED driver"); +MODULE_AUTHOR("Dan Murphy "); +MODULE_LICENSE("GPL v2");