1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
4 *
5 * Control the Cobalt Qube/RaQ front LED
6 */
7 #include <linux/io.h>
8 #include <linux/ioport.h>
9 #include <linux/leds.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/types.h>
13
14 #define LED_FRONT_LEFT 0x01
15 #define LED_FRONT_RIGHT 0x02
16
17 static void __iomem *led_port;
18 static u8 led_value;
19
qube_front_led_set(struct led_classdev * led_cdev,enum led_brightness brightness)20 static void qube_front_led_set(struct led_classdev *led_cdev,
21 enum led_brightness brightness)
22 {
23 if (brightness)
24 led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
25 else
26 led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);
27 writeb(led_value, led_port);
28 }
29
30 static struct led_classdev qube_front_led = {
31 .name = "qube::front",
32 .brightness = LED_FULL,
33 .brightness_set = qube_front_led_set,
34 .default_trigger = "default-on",
35 };
36
cobalt_qube_led_probe(struct platform_device * pdev)37 static int cobalt_qube_led_probe(struct platform_device *pdev)
38 {
39 struct resource *res;
40
41 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
42 if (!res)
43 return -EBUSY;
44
45 led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
46 if (!led_port)
47 return -ENOMEM;
48
49 led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
50 writeb(led_value, led_port);
51
52 return devm_led_classdev_register(&pdev->dev, &qube_front_led);
53 }
54
55 static struct platform_driver cobalt_qube_led_driver = {
56 .probe = cobalt_qube_led_probe,
57 .driver = {
58 .name = "cobalt-qube-leds",
59 },
60 };
61
62 module_platform_driver(cobalt_qube_led_driver);
63
64 MODULE_LICENSE("GPL");
65 MODULE_DESCRIPTION("Front LED support for Cobalt Server");
66 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
67 MODULE_ALIAS("platform:cobalt-qube-leds");
68