Merge remote-tracking branch 'stable/linux-5.15.y' into rpi-5.15.y
[platform/kernel/linux-rpi.git] / drivers / leds / leds-net48xx.c
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
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
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
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
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