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// SPDX-License-Identifier: GPL-2.0 /* * nvec_paz00: OEM specific driver for Compal PAZ00 based devices * * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net> * * Authors: Ilya Petrov <ilya.muromec@gmail.com> */ #include <linux/module.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/leds.h> #include <linux/platform_device.h> #include "nvec.h" #define to_nvec_led(led_cdev) \ container_of(led_cdev, struct nvec_led, cdev) #define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'} #define NVEC_LED_MAX 8 struct nvec_led { struct led_classdev cdev; struct nvec_chip *nvec; }; static void nvec_led_brightness_set(struct led_classdev *led_cdev, enum led_brightness value) { struct nvec_led *led = to_nvec_led(led_cdev); unsigned char buf[] = NVEC_LED_REQ; buf[4] = value; nvec_write_async(led->nvec, buf, sizeof(buf)); led->cdev.brightness = value; } static int nvec_paz00_probe(struct platform_device *pdev) { struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent); struct nvec_led *led; int ret = 0; led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); if (!led) return -ENOMEM; led->cdev.max_brightness = NVEC_LED_MAX; led->cdev.brightness_set = nvec_led_brightness_set; led->cdev.name = "paz00-led"; led->cdev.flags |= LED_CORE_SUSPENDRESUME; led->nvec = nvec; platform_set_drvdata(pdev, led); ret = devm_led_classdev_register(&pdev->dev, &led->cdev); if (ret < 0) return ret; /* to expose the default value to userspace */ led->cdev.brightness = 0; return 0; } static struct platform_driver nvec_paz00_driver = { .probe = nvec_paz00_probe, .driver = { .name = "nvec-paz00", }, }; module_platform_driver(nvec_paz00_driver); MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>"); MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:nvec-paz00"); |