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[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");