xref: /openbmc/linux/drivers/leds/leds-net48xx.c (revision d2912cb1)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * LEDs driver for Soekris net48xx
4  *
5  * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
6  *
7  * Based on leds-ams-delta.c
8  */
9 
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/platform_device.h>
13 #include <linux/leds.h>
14 #include <linux/err.h>
15 #include <linux/io.h>
16 #include <linux/nsc_gpio.h>
17 #include <linux/scx200_gpio.h>
18 #include <linux/module.h>
19 
20 #define DRVNAME "net48xx-led"
21 #define NET48XX_ERROR_LED_GPIO	20
22 
23 static struct platform_device *pdev;
24 
net48xx_error_led_set(struct led_classdev * led_cdev,enum led_brightness value)25 static void net48xx_error_led_set(struct led_classdev *led_cdev,
26 		enum led_brightness value)
27 {
28 	scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
29 }
30 
31 static struct led_classdev net48xx_error_led = {
32 	.name		= "net48xx::error",
33 	.brightness_set	= net48xx_error_led_set,
34 	.flags		= LED_CORE_SUSPENDRESUME,
35 };
36 
net48xx_led_probe(struct platform_device * pdev)37 static int net48xx_led_probe(struct platform_device *pdev)
38 {
39 	return devm_led_classdev_register(&pdev->dev, &net48xx_error_led);
40 }
41 
42 static struct platform_driver net48xx_led_driver = {
43 	.probe		= net48xx_led_probe,
44 	.driver		= {
45 		.name		= DRVNAME,
46 	},
47 };
48 
net48xx_led_init(void)49 static int __init net48xx_led_init(void)
50 {
51 	int ret;
52 
53 	/* small hack, but scx200_gpio doesn't set .dev if the probe fails */
54 	if (!scx200_gpio_ops.dev) {
55 		ret = -ENODEV;
56 		goto out;
57 	}
58 
59 	ret = platform_driver_register(&net48xx_led_driver);
60 	if (ret < 0)
61 		goto out;
62 
63 	pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
64 	if (IS_ERR(pdev)) {
65 		ret = PTR_ERR(pdev);
66 		platform_driver_unregister(&net48xx_led_driver);
67 		goto out;
68 	}
69 
70 out:
71 	return ret;
72 }
73 
net48xx_led_exit(void)74 static void __exit net48xx_led_exit(void)
75 {
76 	platform_device_unregister(pdev);
77 	platform_driver_unregister(&net48xx_led_driver);
78 }
79 
80 module_init(net48xx_led_init);
81 module_exit(net48xx_led_exit);
82 
83 MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
84 MODULE_DESCRIPTION("Soekris net48xx LED driver");
85 MODULE_LICENSE("GPL");
86 
87