From patchwork Mon May 17 19:28:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sander Vanheule X-Patchwork-Id: 440337 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 95485C43460 for ; Mon, 17 May 2021 19:29:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7BC2461261 for ; Mon, 17 May 2021 19:29:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234052AbhEQTaR (ORCPT ); Mon, 17 May 2021 15:30:17 -0400 Received: from polaris.svanheule.net ([84.16.241.116]:57554 "EHLO polaris.svanheule.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234065AbhEQTaG (ORCPT ); Mon, 17 May 2021 15:30:06 -0400 Received: from terra.local.svanheule.net (unknown [IPv6:2a02:a03f:eafb:ee01:404a:340a:91cb:c07b]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: sander@svanheule.net) by polaris.svanheule.net (Postfix) with ESMTPSA id 84F261FFBFD; Mon, 17 May 2021 21:28:48 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=svanheule.net; s=mail1707; t=1621279728; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=skFc82oUpq1oUMs7aaqrUMEqjSKbtKTv+PdFO81m0lM=; b=SXxCcGdM9jC/X4WjDkat8kDBiT/aqk3Rp+AEpOfV2Xtsgp9mdhdx6bokIBI3eTQuqbsR8g jzlEz8/ee0WwNwP+mAgNz27iDVxPsd95m52M3St7lWWWqSRs5V8qbMFVAf6qYJDRpJ1mac Rczq8HdJL8C3JH2w2NFnvDt/RwggpC9U/nHDlw33fU9ne3VASS9pW1Zrx0McZpv/cGrRzg 4QY9s9y/ZY5nGDgGz7AIkluK3KZOjotjFFqchuf3rGhls4DayUh70FlnMHw20xpRRx4iyj B5NTM5Co6ZAFhanLFaZmtaH4/bKygiqI2HFUm6dpRm4gga0JTz+VAweVAFXpvw== From: Sander Vanheule To: Pavel Machek , Rob Herring , Lee Jones , Mark Brown , Greg Kroah-Hartman , "Rafael J . Wysocki" , Michael Walle , Linus Walleij , Bartosz Golaszewski , linux-leds@vger.kernel.org, devicetree@vger.kernel.org, linux-gpio@vger.kernel.org Cc: Andrew Lunn , Andy Shevchenko , linux-kernel@vger.kernel.org, Sander Vanheule Subject: [PATCH v2 7/7] leds: Add support for RTL8231 LED scan matrix Date: Mon, 17 May 2021 21:28:09 +0200 Message-Id: <752444cff2a7ec5da38dba368c64a5ed7dd87279.1621279162.git.sander@svanheule.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Both single and bi-color scanning modes are supported. The driver will verify that the addresses are valid for the current mode, before registering the LEDs. LEDs can be turned on, off, or toggled at one of six predefined rates from 40ms to 1280ms. Implements a platform device for use as child device with RTL8231 MFD, and uses the parent regmap to access the required registers. Signed-off-by: Sander Vanheule --- drivers/leds/Kconfig | 10 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-rtl8231.c | 293 ++++++++++++++++++++++++++++++++++++ 3 files changed, 304 insertions(+) create mode 100644 drivers/leds/leds-rtl8231.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 49d99cb084db..e5ff6150800c 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -593,6 +593,16 @@ config LEDS_REGULATOR help This option enables support for regulator driven LEDs. +config LEDS_RTL8231 + tristate "RTL8231 LED matrix support" + depends on LEDS_CLASS + depends on MFD_RTL8231 + default MFD_RTL8231 + help + This options enables support for using the LED scanning matrix output + of the RTL8231 GPIO and LED expander chip. + When built as a module, this module will be named rtl8231_leds. + config LEDS_BD2802 tristate "LED driver for BD2802 RGB LED" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 7e604d3028c8..ce0f44a87dee 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -80,6 +80,7 @@ obj-$(CONFIG_LEDS_PM8058) += leds-pm8058.o obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o obj-$(CONFIG_LEDS_PWM) += leds-pwm.o obj-$(CONFIG_LEDS_REGULATOR) += leds-regulator.o +obj-$(CONFIG_LEDS_RTL8231) += leds-rtl8231.o obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o obj-$(CONFIG_LEDS_SC27XX_BLTC) += leds-sc27xx-bltc.o obj-$(CONFIG_LEDS_SGM3140) += leds-sgm3140.o diff --git a/drivers/leds/leds-rtl8231.c b/drivers/leds/leds-rtl8231.c new file mode 100644 index 000000000000..7712bbaaf7c1 --- /dev/null +++ b/drivers/leds/leds-rtl8231.c @@ -0,0 +1,293 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include +#include +#include +#include +#include +#include +#include + +#include + +/** + * struct led_toggle_rate - description of an LED blinking mode + * @interval: LED toggle rate in ms + * @mode: Register field value used to active this mode + * + * For LED hardware accelerated blinking, with equal on and off delay. + * Both delays are given by @interval, so the interval at which the LED blinks + * (i.e. turn on and off once) is double this value. + */ +struct led_toggle_rate { + u16 interval; + u8 mode; +}; + +/** + * struct led_modes - description of all LED modes + * @toggle_rates: Array of led_toggle_rate values, sorted by ascending interval + * @num_toggle_rates: Number of elements in @led_toggle_rate + * @off: Register field value to turn LED off + * @on: Register field value to turn LED on + */ +struct led_modes { + const struct led_toggle_rate *toggle_rates; + unsigned int num_toggle_rates; + u8 off; + u8 on; +}; + +struct rtl8231_led { + struct led_classdev led; + const struct led_modes *modes; + struct regmap_field *reg_field; +}; +#define to_rtl8231_led(_cdev) container_of(_cdev, struct rtl8231_led, led) + +#define RTL8231_NUM_LEDS 3 +#define RTL8231_LED_PER_REG 5 +#define RTL8231_BITS_PER_LED 3 + +static const unsigned int rtl8231_led_port_counts_single[RTL8231_NUM_LEDS] = {32, 32, 24}; +static const unsigned int rtl8231_led_port_counts_bicolor[RTL8231_NUM_LEDS] = {24, 24, 24}; + +static const unsigned int rtl8231_led_base[RTL8231_NUM_LEDS] = { + RTL8231_REG_LED0_BASE, + RTL8231_REG_LED1_BASE, + RTL8231_REG_LED2_BASE, +}; + +static const struct led_toggle_rate rtl8231_toggle_rates[] = { + { 40, 1}, + { 80, 2}, + { 160, 3}, + { 320, 4}, + { 640, 5}, + {1280, 6}, +}; + +static const struct led_modes rtl8231_led_modes = { + .off = 0, + .on = 7, + .num_toggle_rates = ARRAY_SIZE(rtl8231_toggle_rates), + .toggle_rates = rtl8231_toggle_rates, +}; + +static void rtl8231_led_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + struct rtl8231_led *pled = to_rtl8231_led(led_cdev); + + if (brightness) + regmap_field_write(pled->reg_field, pled->modes->on); + else + regmap_field_write(pled->reg_field, pled->modes->off); +} + +static enum led_brightness rtl8231_led_brightness_get(struct led_classdev *led_cdev) +{ + struct rtl8231_led *pled = to_rtl8231_led(led_cdev); + u32 current_mode = pled->modes->off; + + regmap_field_read(pled->reg_field, ¤t_mode); + + if (current_mode == pled->modes->off) + return LED_OFF; + else + return LED_ON; +} + +static unsigned int rtl8231_led_current_interval(struct rtl8231_led *pled) +{ + unsigned int mode; + unsigned int i = 0; + + if (regmap_field_read(pled->reg_field, &mode)) + return 0; + + while (i < pled->modes->num_toggle_rates && mode != pled->modes->toggle_rates[i].mode) + i++; + + if (i < pled->modes->num_toggle_rates) + return pled->modes->toggle_rates[i].interval; + else + return 0; +} + +static int rtl8231_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on, + unsigned long *delay_off) +{ + struct rtl8231_led *pled = to_rtl8231_led(led_cdev); + const struct led_modes *modes = pled->modes; + unsigned int interval; + unsigned int i = 0; + int err; + + if (*delay_on == 0 && *delay_off == 0) { + /* Choose 500ms as default interval */ + interval = 500; + } else { + /* + * If the current mode is blinking, choose the delay that (likely) changed. + * Otherwise, choose the interval that would have the same total delay. + */ + interval = rtl8231_led_current_interval(pled); + + if (interval > 0 && interval == *delay_off) + interval = *delay_on; + else if (interval > 0 && interval == *delay_on) + interval = *delay_off; + else + interval = (*delay_on + *delay_off) / 2; + } + + /* Find clamped toggle interval */ + while (i < (modes->num_toggle_rates - 1) && interval > modes->toggle_rates[i].interval) + i++; + + interval = modes->toggle_rates[i].interval; + + err = regmap_field_write(pled->reg_field, modes->toggle_rates[i].mode); + if (err) + return err; + + *delay_on = interval; + *delay_off = interval; + + return 0; +} + +static int rtl8231_led_read_address(struct fwnode_handle *fwnode, unsigned int *addr_port, + unsigned int *addr_led) +{ + u32 addr[2]; + int err; + + if (!fwnode_property_count_u32(fwnode, "reg")) + return -ENODEV; + + err = fwnode_property_read_u32_array(fwnode, "reg", addr, ARRAY_SIZE(addr)); + if (err) + return err; + + *addr_port = addr[0]; + *addr_led = addr[1]; + + return 0; +} + +static struct reg_field rtl8231_led_get_field(unsigned int port_index, unsigned int led_index) +{ + unsigned int offset, shift; + struct reg_field field; + + offset = port_index / RTL8231_LED_PER_REG; + shift = (port_index % RTL8231_LED_PER_REG) * RTL8231_BITS_PER_LED; + + field.reg = rtl8231_led_base[led_index] + offset; + field.lsb = shift; + field.msb = shift + RTL8231_BITS_PER_LED - 1; + + return field; +} + +static int rtl8231_led_probe_single(struct device *dev, struct regmap *map, + const unsigned int *port_counts, struct fwnode_handle *fwnode) +{ + struct led_init_data init_data = {}; + struct rtl8231_led *pled; + unsigned int port_index; + unsigned int led_index; + struct reg_field field; + int err; + + pled = devm_kzalloc(dev, sizeof(*pled), GFP_KERNEL); + if (IS_ERR(pled)) + return PTR_ERR(pled); + + err = rtl8231_led_read_address(fwnode, &port_index, &led_index); + + if (err) { + dev_err(dev, "LED address invalid\n"); + return err; + } else if (led_index >= RTL8231_NUM_LEDS || port_index >= port_counts[led_index]) { + dev_err(dev, "LED address (%d.%d) invalid\n", port_index, led_index); + return -ENODEV; + } + + field = rtl8231_led_get_field(port_index, led_index); + pled->reg_field = devm_regmap_field_alloc(dev, map, field); + if (IS_ERR(pled->reg_field)) + return PTR_ERR(pled->reg_field); + + pled->modes = &rtl8231_led_modes; + + pled->led.max_brightness = 1; + pled->led.brightness_get = rtl8231_led_brightness_get; + pled->led.brightness_set = rtl8231_led_brightness_set; + pled->led.blink_set = rtl8231_led_blink_set; + + init_data.fwnode = fwnode; + + return devm_led_classdev_register_ext(dev, &pled->led, &init_data); +} + +static int rtl8231_led_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const unsigned int *port_counts; + struct fwnode_handle *child; + struct regmap *map; + int err; + + map = dev_get_regmap(dev->parent, NULL); + if (IS_ERR_OR_NULL(map)) { + dev_err(dev, "failed to retrieve regmap\n"); + if (!map) + return -ENODEV; + else + return PTR_ERR(map); + } + + if (!device_property_match_string(dev, "realtek,led-scan-mode", "single-color")) { + port_counts = rtl8231_led_port_counts_single; + regmap_update_bits(map, RTL8231_REG_FUNC0, + RTL8231_FUNC0_SCAN_MODE, RTL8231_FUNC0_SCAN_SINGLE); + } else if (!device_property_match_string(dev, "realtek,led-scan-mode", "bi-color")) { + port_counts = rtl8231_led_port_counts_bicolor; + regmap_update_bits(map, RTL8231_REG_FUNC0, + RTL8231_FUNC0_SCAN_MODE, RTL8231_FUNC0_SCAN_BICOLOR); + } else { + dev_err(dev, "scan mode missing or invalid\n"); + return -EINVAL; + } + + fwnode_for_each_available_child_node(dev->fwnode, child) { + err = rtl8231_led_probe_single(dev, map, port_counts, child); + if (err) + dev_warn(dev, "failed to register LED %pfwP\n", child); + continue; + } + + return 0; +} + +static const struct of_device_id of_rtl8231_led_match[] = { + { .compatible = "realtek,rtl8231-leds" }, + {} +}; +MODULE_DEVICE_TABLE(of, of_rtl8231_led_match); + +static struct platform_driver rtl8231_led_driver = { + .driver = { + .name = "rtl8231-leds", + .of_match_table = of_rtl8231_led_match, + }, + .probe = rtl8231_led_probe, +}; +module_platform_driver(rtl8231_led_driver); + +MODULE_AUTHOR("Sander Vanheule "); +MODULE_DESCRIPTION("Realtek RTL8231 LED support"); +MODULE_LICENSE("GPL v2");