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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id c15-20020adfef4f000000b002c7066a6f77sm13748526wrp.31.2023.03.22.05.43.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Mar 2023 05:43:34 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: Lee Jones , Pavel Machek Cc: Patrick Rudolph , Naresh Solanki , linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org Subject: [PATCH 2/2] leds: max597x: Add support for max597x Date: Wed, 22 Mar 2023 13:43:16 +0100 Message-Id: <20230322124316.2147143-2-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230322124316.2147143-1-Naresh.Solanki@9elements.com> References: <20230322124316.2147143-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761073327599750761?= X-GMAIL-MSGID: =?utf-8?q?1761073327599750761?= From: Patrick Rudolph max597x is hot swap controller with indication led support. This driver uses DT property to configure led during boot time & also provide the led control in sysfs. Signed-off-by: Patrick Rudolph Signed-off-by: Naresh Solanki --- drivers/leds/Kconfig | 11 +++ drivers/leds/Makefile | 1 + drivers/leds/leds-max597x.c | 132 ++++++++++++++++++++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 drivers/leds/leds-max597x.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 9dbce09eabac..ba184a3f736e 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -590,6 +590,17 @@ config LEDS_ADP5520 To compile this driver as a module, choose M here: the module will be called leds-adp5520. +config LEDS_MAX597X + tristate "LED Support for Maxim 597x" + depends on LEDS_CLASS + depends on MFD_MAX597X + help + This option enables support for the Maxim 597x smart switch indication LEDs + via the I2C bus. + + To compile this driver as a module, choose M here: the module will + be called max597x-led. + config LEDS_MC13783 tristate "LED Support for MC13XXX PMIC" depends on LEDS_CLASS diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index d30395d11fd8..da1192e40268 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -53,6 +53,7 @@ obj-$(CONFIG_LEDS_LP8501) += leds-lp8501.o obj-$(CONFIG_LEDS_LP8788) += leds-lp8788.o obj-$(CONFIG_LEDS_LP8860) += leds-lp8860.o obj-$(CONFIG_LEDS_LT3593) += leds-lt3593.o +obj-$(CONFIG_LEDS_MAX597X) += leds-max597x.o obj-$(CONFIG_LEDS_MAX77650) += leds-max77650.o obj-$(CONFIG_LEDS_MAX8997) += leds-max8997.o obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o diff --git a/drivers/leds/leds-max597x.c b/drivers/leds/leds-max597x.c new file mode 100644 index 000000000000..e2844202a35b --- /dev/null +++ b/drivers/leds/leds-max597x.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Device driver for regulators in MAX5970 and MAX5978 IC + * + * Copyright (c) 2022 9elements GmbH + * + * Author: Patrick Rudolph + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ldev_to_maxled(c) container_of(c, struct max597x_led, led) + +struct max597x_led { + struct regmap *regmap; + struct led_classdev led; + unsigned int index; +}; + +static int max597x_led_set_brightness(struct led_classdev *cdev, + enum led_brightness brightness) +{ + struct max597x_led *led = ldev_to_maxled(cdev); + int ret; + + if (!led || !led->regmap) + return -ENODEV; + + ret = regmap_update_bits(led->regmap, MAX5970_REG_LED_FLASH, + 1 << led->index, ~brightness << led->index); + if (ret < 0) + dev_err(cdev->dev, "failed to set brightness %d\n", ret); + return ret; +} + +static int max597x_setup_led(struct device *dev, struct regmap *regmap, struct device_node *nc, + u32 reg) +{ + struct max597x_led *led; + const char *state; + int ret = 0; + + led = devm_kzalloc(dev, sizeof(struct max597x_led), + GFP_KERNEL); + if (!led) + return -ENOMEM; + + if (of_property_read_string(nc, "label", &led->led.name)) + led->led.name = nc->name; + + led->led.max_brightness = 1; + led->led.brightness_set_blocking = max597x_led_set_brightness; + led->led.default_trigger = "none"; + led->index = reg; + led->regmap = regmap; + ret = led_classdev_register(dev, &led->led); + if (ret) { + dev_err(dev, "Error in initializing led %s", led->led.name); + devm_kfree(dev, led); + return ret; + } + + if (!of_property_read_string(nc, "default-state", &state)) { + if (!strcmp(state, "on")) { + led->led.brightness = 1; + led_set_brightness(&led->led, led->led.brightness); + } + } + return 0; +} + +static int max597x_led_probe(struct platform_device *pdev) +{ + struct device_node *np = dev_of_node(pdev->dev.parent); + struct i2c_client *i2c = to_i2c_client(pdev->dev.parent); + struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL); + struct device_node *led_node; + struct device_node *child; + int ret = 0; + + if (!regmap) + return -EPROBE_DEFER; + + led_node = of_get_child_by_name(np, "leds"); + if (!led_node) + return -ENODEV; + + for_each_available_child_of_node(led_node, child) { + u32 reg; + + if (of_property_read_u32(child, "reg", ®)) + continue; + + if (reg >= MAX597X_NUM_LEDS) { + dev_err(&i2c->dev, "invalid LED (%u >= %d)\n", reg, + MAX597X_NUM_LEDS); + continue; + } + + ret = max597x_setup_led(&i2c->dev, regmap, child, reg); + if (ret < 0) { + of_node_put(child); + return ret; + } + } + + return ret; +} + +static struct platform_driver max597x_led_driver = { + .driver = { + .name = "max597x-led", + }, + .probe = max597x_led_probe, +}; + +module_platform_driver(max597x_led_driver); + +MODULE_AUTHOR("Patrick Rudolph "); +MODULE_DESCRIPTION("MAX5970_hot-swap controller driver"); +MODULE_LICENSE("GPL");