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