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[209.132.180.67]) by mx.google.com with ESMTP id w19-v6si15454989plp.538.2018.05.04.03.09.49; Fri, 04 May 2018 03:09:49 -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=@linaro.org header.s=google header.b=fp76BNx/; 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=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751476AbeEDKJq (ORCPT + 29 others); Fri, 4 May 2018 06:09:46 -0400 Received: from mail-pf0-f193.google.com ([209.85.192.193]:34961 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751107AbeEDKJl (ORCPT ); Fri, 4 May 2018 06:09:41 -0400 Received: by mail-pf0-f193.google.com with SMTP id j5so17085411pfh.2 for ; Fri, 04 May 2018 03:09:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=/sUQmAh+gOQ/htKRUetO0u6COUnEsgsKryM42hCaJ9w=; b=fp76BNx/Ecg1mRjMPZTCZRsNFFjIxkl65zRU6y6ljAvYkZqNSiEZDRDSbWytfeCY8X e1BN7Alf/UPaRFRSOxZdiUlzi2CXjrutJW8gGAmtEtfS/MoJQFr2sMNPbwuaqqIk8Gcg UBK3mkfiBtfU69s9ES8MBa2yJqC6RmzkwmFfI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=/sUQmAh+gOQ/htKRUetO0u6COUnEsgsKryM42hCaJ9w=; b=Veqmnvhpqvq/sy34tHRNFTUCBRT66C0+2enHzYKPq618vUhdEzZjpki2i73EGaG1Q+ RnqsSatGnzwJY3Rad0p/K7FCbbfBl5XrUJ10l99SIWLtmKPwUTwuSU9Uy+V07OoHWPZZ jrFZ6d4/bLg3ep96qTwVPvUHYUxNL44bPjInIMvlc9srIqcR4ycS5ahEDhJjMxaFBQh5 q8WHn5NVSIIiTWJHULKElpScsi9hIrTvARsBIUVMAD0gBRYiChca8DO43C2R0X7PLf2O 0firhUcGlaP8frj40Lt3Yr7gaW4ynG49hcwSqnGLnXhNPIYUjwfQ8TGwqq9YAEQ5I4/S 4myA== X-Gm-Message-State: ALQs6tDYF1Lg5lalKr6moDgKZo4+ZZVGBEPTGu9ZdIes6LQ+TO4/3Re8 ZgJsR+t1mtUvXGrWkWMBz7/yBw== X-Received: by 2002:a17:902:1a6:: with SMTP id b35-v6mr27241901plb.80.1525428581124; Fri, 04 May 2018 03:09:41 -0700 (PDT) Received: from baolinwangubtpc.spreadtrum.com ([117.18.48.82]) by smtp.gmail.com with ESMTPSA id e126sm31991269pfh.5.2018.05.04.03.09.37 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 04 May 2018 03:09:40 -0700 (PDT) From: Baolin Wang To: jacek.anaszewski@gmail.com, pavel@ucw.cz, robh+dt@kernel.org, mark.rutland@arm.com Cc: xiaotong.lu@spreadtrum.com, baolin.wang@linaro.org, broonie@kernel.org, linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] leds: Add Spreadtrum SC27xx breathing light controller driver Date: Fri, 4 May 2018 18:08:36 +0800 Message-Id: <1bf5bc3e007d237477d740f47ed63f05aa71b348.1525427961.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <099f4075ec489e425b5f1e7668a078c05f0d8509.1525427961.git.baolin.wang@linaro.org> References: <099f4075ec489e425b5f1e7668a078c05f0d8509.1525427961.git.baolin.wang@linaro.org> In-Reply-To: <099f4075ec489e425b5f1e7668a078c05f0d8509.1525427961.git.baolin.wang@linaro.org> References: <099f4075ec489e425b5f1e7668a078c05f0d8509.1525427961.git.baolin.wang@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiaotong Lu This patch adds Spreadtrum SC27xx PMIC series breathing light controller driver, which can support 3 LEDs. Each LED can work at normal PWM mode and breathing mode. Signed-off-by: Xiaotong Lu Signed-off-by: Baolin Wang --- drivers/leds/Kconfig | 11 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-sc27xx-bltc.c | 369 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 381 insertions(+) create mode 100644 drivers/leds/leds-sc27xx-bltc.c -- 1.7.9.5 diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 2c896c0..319449b 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -647,6 +647,17 @@ config LEDS_IS31FL32XX LED controllers. They are I2C devices with multiple constant-current channels, each with independent 256-level PWM control. +config LEDS_SC27XX_BLTC + tristate "LED support for the SC27xx breathing light controller" + depends on LEDS_CLASS && MFD_SC27XX_PMIC + depends on OF + help + Say Y here to include support for the SC27xx breathing light controller + LEDs. + + This driver can also be built as a module. If so the module will be + called leds-sc27xx-bltc. + comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)" config LEDS_BLINKM diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 91eca81..ff6917e 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -76,6 +76,7 @@ obj-$(CONFIG_LEDS_MLXREG) += leds-mlxreg.o obj-$(CONFIG_LEDS_NIC78BX) += leds-nic78bx.o obj-$(CONFIG_LEDS_MT6323) += leds-mt6323.o obj-$(CONFIG_LEDS_LM3692X) += leds-lm3692x.o +obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o # LED SPI Drivers obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o diff --git a/drivers/leds/leds-sc27xx-bltc.c b/drivers/leds/leds-sc27xx-bltc.c new file mode 100644 index 0000000..0016a87 --- /dev/null +++ b/drivers/leds/leds-sc27xx-bltc.c @@ -0,0 +1,369 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Spreadtrum Communications Inc. + */ + +#include +#include +#include +#include +#include + +/* PMIC global control register definition */ +#define SC27XX_MODULE_EN0 0xc08 +#define SC27XX_CLK_EN0 0xc18 +#define SC27XX_RGB_CTRL 0xebc + +#define SC27XX_BLTC_EN BIT(9) +#define SC27XX_RTC_EN BIT(7) +#define SC27XX_RGB_PD BIT(0) + +/* Breathing light controller register definition */ +#define SC27XX_LEDS_CTRL 0x00 +#define SC27XX_LEDS_PRESCALE 0x04 +#define SC27XX_LEDS_DUTY 0x08 +#define SC27XX_LEDS_CURVE0 0x0c +#define SC27XX_LEDS_CURVE1 0x10 + +#define SC27XX_CTRL_SHIFT 4 +#define SC27XX_LED_RUN BIT(0) +#define SC27XX_LED_TYPE BIT(1) + +#define SC27XX_DUTY_SHIFT 8 +#define SC27XX_DUTY_MASK GENMASK(15, 0) +#define SC27XX_MOD_MASK GENMASK(7, 0) + +#define SC27XX_CURVE_SHIFT 8 +#define SC27XX_CURVE_L_MASK GENMASK(7, 0) +#define SC27XX_CURVE_H_MASK GENMASK(15, 8) + +#define SC27XX_LEDS_OFFSET 0x10 +#define SC27XX_LEDS_MAX 3 + +/* + * The SC27xx breathing light controller can support 3 outputs: red LED, + * green LED and blue LED. Each LED can support normal PWM mode and breathing + * mode. + * + * In breathing mode, the LED output curve includes raise, high, fall and low 4 + * stages, and the duration of each stage is configurable. + */ +enum sc27xx_led_config { + SC27XX_RAISE_TIME, + SC27XX_FALL_TIME, + SC27XX_HIGH_TIME, + SC27XX_LOW_TIME, +}; + +struct sc27xx_led { + struct led_classdev ldev; + struct sc27xx_led_priv *priv; + enum led_brightness value; + u8 line; + bool breath_mode; + bool active; +}; + +struct sc27xx_led_priv { + struct sc27xx_led leds[SC27XX_LEDS_MAX]; + struct regmap *regmap; + u32 base; +}; + +#define to_sc27xx_led(ldev) \ + container_of(ldev, struct sc27xx_led, ldev) + +static int sc27xx_led_init(struct regmap *regmap) +{ + int err; + + err = regmap_update_bits(regmap, SC27XX_MODULE_EN0, SC27XX_BLTC_EN, + SC27XX_BLTC_EN); + if (err) + return err; + + err = regmap_update_bits(regmap, SC27XX_CLK_EN0, SC27XX_RTC_EN, + SC27XX_RTC_EN); + if (err) + return err; + + return regmap_update_bits(regmap, SC27XX_RGB_CTRL, SC27XX_RGB_PD, 0); +} + +static u32 sc27xx_led_get_offset(struct sc27xx_led *leds) +{ + return leds->priv->base + SC27XX_LEDS_OFFSET * leds->line; +} + +static int sc27xx_led_enable(struct sc27xx_led *leds) +{ + u32 base = sc27xx_led_get_offset(leds); + u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL; + u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line; + struct regmap *regmap = leds->priv->regmap; + int err; + + err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY, + SC27XX_DUTY_MASK, + (leds->value << SC27XX_DUTY_SHIFT) | + SC27XX_MOD_MASK); + if (err) + return err; + + if (leds->breath_mode) + return regmap_update_bits(regmap, ctrl_base, + SC27XX_LED_RUN << ctrl_shift, + SC27XX_LED_RUN << ctrl_shift); + + return regmap_update_bits(regmap, ctrl_base, + (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, + (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift); +} + +static int sc27xx_led_disable(struct sc27xx_led *leds) +{ + u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line; + + leds->breath_mode = false; + + return regmap_update_bits(leds->priv->regmap, + leds->priv->base + SC27XX_LEDS_CTRL, + (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0); +} + +static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value) +{ + struct sc27xx_led *leds = to_sc27xx_led(ldev); + + leds->value = value; + if (value == LED_OFF) + return sc27xx_led_disable(leds); + + return sc27xx_led_enable(leds); +} + +static int sc27xx_led_config(struct sc27xx_led *leds, + enum sc27xx_led_config config, u32 val) +{ + u32 base = sc27xx_led_get_offset(leds); + struct regmap *regmap = leds->priv->regmap; + int err; + + switch (config) { + case SC27XX_RAISE_TIME: + err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0, + SC27XX_CURVE_L_MASK, val); + break; + case SC27XX_FALL_TIME: + err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0, + SC27XX_CURVE_H_MASK, + val << SC27XX_CURVE_SHIFT); + break; + case SC27XX_HIGH_TIME: + err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1, + SC27XX_CURVE_L_MASK, val); + break; + case SC27XX_LOW_TIME: + err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1, + SC27XX_CURVE_H_MASK, + val << SC27XX_CURVE_SHIFT); + break; + default: + err = -ENOTSUPP; + break; + } + + if (!err && !leds->breath_mode) + leds->breath_mode = true; + + return err; +} + +static ssize_t raise_time_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct led_classdev *ldev = dev_get_drvdata(dev); + struct sc27xx_led *leds = to_sc27xx_led(ldev); + u32 val; + int err; + + if (kstrtou32(buf, 10, &val)) + return -EINVAL; + + err = sc27xx_led_config(leds, SC27XX_RAISE_TIME, val); + if (err) + return err; + + return size; +} + +static ssize_t fall_time_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct led_classdev *ldev = dev_get_drvdata(dev); + struct sc27xx_led *leds = to_sc27xx_led(ldev); + u32 val; + int err; + + if (kstrtou32(buf, 10, &val)) + return -EINVAL; + + err = sc27xx_led_config(leds, SC27XX_FALL_TIME, val); + if (err) + return err; + + return size; +} + +static ssize_t high_time_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct led_classdev *ldev = dev_get_drvdata(dev); + struct sc27xx_led *leds = to_sc27xx_led(ldev); + u32 val; + int err; + + if (kstrtou32(buf, 10, &val)) + return -EINVAL; + + err = sc27xx_led_config(leds, SC27XX_HIGH_TIME, val); + if (err) + return err; + + return size; +} + +static ssize_t low_time_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + struct led_classdev *ldev = dev_get_drvdata(dev); + struct sc27xx_led *leds = to_sc27xx_led(ldev); + u32 val; + int err; + + if (kstrtou32(buf, 10, &val)) + return -EINVAL; + + err = sc27xx_led_config(leds, SC27XX_LOW_TIME, val); + if (err) + return err; + + return size; +} + +static DEVICE_ATTR_WO(raise_time); +static DEVICE_ATTR_WO(fall_time); +static DEVICE_ATTR_WO(high_time); +static DEVICE_ATTR_WO(low_time); + +static struct attribute *sc27xx_led_attrs[] = { + &dev_attr_raise_time.attr, + &dev_attr_fall_time.attr, + &dev_attr_high_time.attr, + &dev_attr_low_time.attr, + NULL, +}; +ATTRIBUTE_GROUPS(sc27xx_led); + +static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv) +{ + int i, err; + + err = sc27xx_led_init(priv->regmap); + if (err) + return err; + + for (i = 0; i < SC27XX_LEDS_MAX; i++) { + struct sc27xx_led *led = &priv->leds[i]; + + if (!led->active) + continue; + + led->line = i; + led->priv = priv; + led->ldev.brightness_set_blocking = sc27xx_led_set; + led->ldev.max_brightness = LED_FULL; + led->ldev.groups = sc27xx_led_groups; + + err = devm_led_classdev_register(dev, &led->ldev); + if (err) + return err; + } + + return 0; +} + +static int sc27xx_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node, *child; + struct sc27xx_led_priv *priv; + u32 base, count, reg; + int err; + + count = of_get_child_count(np); + if (!count || count > SC27XX_LEDS_MAX) + return -EINVAL; + + err = of_property_read_u32(np, "reg", &base); + if (err) { + dev_err(dev, "fail to get reg of property\n"); + return err; + } + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->base = base; + priv->regmap = dev_get_regmap(dev->parent, NULL); + if (IS_ERR(priv->regmap)) { + err = PTR_ERR(priv->regmap); + dev_err(dev, "failed to get regmap: %d\n", err); + return err; + } + + for_each_child_of_node(np, child) { + err = of_property_read_u32(child, "reg", ®); + if (err) { + of_node_put(child); + return err; + } + + if (reg < 0 || reg >= SC27XX_LEDS_MAX + || priv->leds[reg].active) { + of_node_put(child); + return -EINVAL; + } + + priv->leds[reg].active = true; + priv->leds[reg].ldev.name = + of_get_property(child, "label", NULL) ? : child->name; + } + + return sc27xx_led_register(dev, priv); +} + +static const struct of_device_id sc27xx_led_of_match[] = { + { .compatible = "sprd,sc27xx-bltc", }, + { } +}; +MODULE_DEVICE_TABLE(of, sc27xx_led_of_match); + +static struct platform_driver sc27xx_led_driver = { + .driver = { + .name = "sc27xx-bltc", + .of_match_table = sc27xx_led_of_match, + }, + .probe = sc27xx_led_probe, +}; + +module_platform_driver(sc27xx_led_driver); + +MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver"); +MODULE_AUTHOR("Xiaotong Lu "); +MODULE_LICENSE("GPL v2");