1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * nvec_paz00: OEM specific driver for Compal PAZ00 based devices 4 * 5 * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net> 6 * 7 * Authors: Ilya Petrov <ilya.muromec@gmail.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/err.h> 12 #include <linux/slab.h> 13 #include <linux/leds.h> 14 #include <linux/platform_device.h> 15 #include "nvec.h" 16 17 #define to_nvec_led(led_cdev) \ 18 container_of(led_cdev, struct nvec_led, cdev) 19 20 #define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'} 21 22 #define NVEC_LED_MAX 8 23 24 struct nvec_led { 25 struct led_classdev cdev; 26 struct nvec_chip *nvec; 27 }; 28 29 static void nvec_led_brightness_set(struct led_classdev *led_cdev, 30 enum led_brightness value) 31 { 32 struct nvec_led *led = to_nvec_led(led_cdev); 33 unsigned char buf[] = NVEC_LED_REQ; 34 35 buf[4] = value; 36 37 nvec_write_async(led->nvec, buf, sizeof(buf)); 38 39 led->cdev.brightness = value; 40 } 41 42 static int nvec_paz00_probe(struct platform_device *pdev) 43 { 44 struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent); 45 struct nvec_led *led; 46 int ret = 0; 47 48 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL); 49 if (!led) 50 return -ENOMEM; 51 52 led->cdev.max_brightness = NVEC_LED_MAX; 53 54 led->cdev.brightness_set = nvec_led_brightness_set; 55 led->cdev.name = "paz00-led"; 56 led->cdev.flags |= LED_CORE_SUSPENDRESUME; 57 led->nvec = nvec; 58 59 platform_set_drvdata(pdev, led); 60 61 ret = devm_led_classdev_register(&pdev->dev, &led->cdev); 62 if (ret < 0) 63 return ret; 64 65 /* to expose the default value to userspace */ 66 led->cdev.brightness = 0; 67 68 return 0; 69 } 70 71 static struct platform_driver nvec_paz00_driver = { 72 .probe = nvec_paz00_probe, 73 .driver = { 74 .name = "nvec-paz00", 75 }, 76 }; 77 78 module_platform_driver(nvec_paz00_driver); 79 80 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>"); 81 MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver"); 82 MODULE_LICENSE("GPL"); 83 MODULE_ALIAS("platform:nvec-paz00"); 84