1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * LEDs driver for the Cobalt Raq series.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/init.h>
8*4882a593Smuzhiyun #include <linux/io.h>
9*4882a593Smuzhiyun #include <linux/ioport.h>
10*4882a593Smuzhiyun #include <linux/leds.h>
11*4882a593Smuzhiyun #include <linux/platform_device.h>
12*4882a593Smuzhiyun #include <linux/spinlock.h>
13*4882a593Smuzhiyun #include <linux/types.h>
14*4882a593Smuzhiyun #include <linux/export.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define LED_WEB 0x04
17*4882a593Smuzhiyun #define LED_POWER_OFF 0x08
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static void __iomem *led_port;
20*4882a593Smuzhiyun static u8 led_value;
21*4882a593Smuzhiyun static DEFINE_SPINLOCK(led_value_lock);
22*4882a593Smuzhiyun
raq_web_led_set(struct led_classdev * led_cdev,enum led_brightness brightness)23*4882a593Smuzhiyun static void raq_web_led_set(struct led_classdev *led_cdev,
24*4882a593Smuzhiyun enum led_brightness brightness)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun unsigned long flags;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun spin_lock_irqsave(&led_value_lock, flags);
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun if (brightness)
31*4882a593Smuzhiyun led_value |= LED_WEB;
32*4882a593Smuzhiyun else
33*4882a593Smuzhiyun led_value &= ~LED_WEB;
34*4882a593Smuzhiyun writeb(led_value, led_port);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun spin_unlock_irqrestore(&led_value_lock, flags);
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static struct led_classdev raq_web_led = {
40*4882a593Smuzhiyun .name = "raq::web",
41*4882a593Smuzhiyun .brightness_set = raq_web_led_set,
42*4882a593Smuzhiyun };
43*4882a593Smuzhiyun
raq_power_off_led_set(struct led_classdev * led_cdev,enum led_brightness brightness)44*4882a593Smuzhiyun static void raq_power_off_led_set(struct led_classdev *led_cdev,
45*4882a593Smuzhiyun enum led_brightness brightness)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun unsigned long flags;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun spin_lock_irqsave(&led_value_lock, flags);
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun if (brightness)
52*4882a593Smuzhiyun led_value |= LED_POWER_OFF;
53*4882a593Smuzhiyun else
54*4882a593Smuzhiyun led_value &= ~LED_POWER_OFF;
55*4882a593Smuzhiyun writeb(led_value, led_port);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun spin_unlock_irqrestore(&led_value_lock, flags);
58*4882a593Smuzhiyun }
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun static struct led_classdev raq_power_off_led = {
61*4882a593Smuzhiyun .name = "raq::power-off",
62*4882a593Smuzhiyun .brightness_set = raq_power_off_led_set,
63*4882a593Smuzhiyun .default_trigger = "power-off",
64*4882a593Smuzhiyun };
65*4882a593Smuzhiyun
cobalt_raq_led_probe(struct platform_device * pdev)66*4882a593Smuzhiyun static int cobalt_raq_led_probe(struct platform_device *pdev)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun struct resource *res;
69*4882a593Smuzhiyun int retval;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
72*4882a593Smuzhiyun if (!res)
73*4882a593Smuzhiyun return -EBUSY;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
76*4882a593Smuzhiyun if (!led_port)
77*4882a593Smuzhiyun return -ENOMEM;
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
80*4882a593Smuzhiyun if (retval)
81*4882a593Smuzhiyun goto err_null;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun retval = led_classdev_register(&pdev->dev, &raq_web_led);
84*4882a593Smuzhiyun if (retval)
85*4882a593Smuzhiyun goto err_unregister;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun return 0;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun err_unregister:
90*4882a593Smuzhiyun led_classdev_unregister(&raq_power_off_led);
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun err_null:
93*4882a593Smuzhiyun led_port = NULL;
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun return retval;
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun static struct platform_driver cobalt_raq_led_driver = {
99*4882a593Smuzhiyun .probe = cobalt_raq_led_probe,
100*4882a593Smuzhiyun .driver = {
101*4882a593Smuzhiyun .name = "cobalt-raq-leds",
102*4882a593Smuzhiyun },
103*4882a593Smuzhiyun };
104*4882a593Smuzhiyun
105*4882a593Smuzhiyun builtin_platform_driver(cobalt_raq_led_driver);
106