1/*	$NetBSD: obsled.c,v 1.12 2024/09/07 06:17:38 andvar Exp $	*/
2
3/*
4 * Copyright (c) 2004 Shigeyuki Fukushima.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above
13 *    copyright notice, this list of conditions and the following
14 *    disclaimer in the documentation and/or other materials provided
15 *    with the distribution.
16 * 3. The name of the author may not be used to endorse or promote
17 *    products derived from this software without specific prior
18 *    written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
21 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
24 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
26 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: obsled.c,v 1.12 2024/09/07 06:17:38 andvar Exp $");
35
36#include <sys/param.h>
37#include <sys/device.h>
38#include <sys/queue.h>
39#include <sys/sysctl.h>
40#include <sys/systm.h>
41
42#include <machine/obs266.h>
43
44#include <powerpc/ibm4xx/dev/gpiovar.h>
45
46struct obsled_softc {
47        device_t sc_dev;
48	gpio_tag_t sc_tag;
49        int sc_addr;
50	int sc_led_state;	/* LED status (ON=1/OFF=0) */
51	int sc_led_state_mib;
52};
53
54static void	obsled_attach(device_t, device_t, void *);
55static int	obsled_match(device_t, cfdata_t, void *);
56static int	obsled_sysctl_verify(SYSCTLFN_PROTO);
57static void	obsled_set_state(struct obsled_softc *);
58
59CFATTACH_DECL_NEW(obsled, sizeof(struct obsled_softc),
60	obsled_match, obsled_attach, NULL, NULL);
61
62static int
63obsled_match(device_t parent, cfdata_t cf, void *aux)
64{
65        struct gpio_attach_args *ga = aux;
66
67	/* XXX: support only OpenBlockS266 LED */
68        if (ga->ga_addr == OBS266_GPIO_LED1)
69                return (1);
70        else if (ga->ga_addr == OBS266_GPIO_LED2)
71                return (1);
72        else if (ga->ga_addr == OBS266_GPIO_LED4)
73                return (1);
74
75        return (0);
76}
77
78static void
79obsled_attach(device_t parent, device_t self, void *aux)
80{
81        struct obsled_softc *sc = device_private(self);
82        struct gpio_attach_args *ga = aux;
83	struct sysctlnode *node;
84	int err, node_mib;
85	char led_name[5];
86	/* int led = (1 << device_unit(sc->sc_dev)); */
87
88	snprintf(led_name, sizeof(led_name),
89		"led%d", (1 << device_unit(sc->sc_dev)) & 0x7);
90        aprint_naive(": OpenBlockS %s\n", led_name);
91        aprint_normal(": OpenBlockS %s\n", led_name);
92
93	sc->sc_dev = self;
94        sc->sc_tag = ga->ga_tag;
95        sc->sc_addr = ga->ga_addr;
96	sc->sc_led_state = 0;
97
98	obs266_led_set(OBS266_LED_OFF);
99
100	/* add sysctl interface */
101	err = sysctl_createv(NULL, 0,
102			NULL, (const struct sysctlnode **)&node,
103			0, CTLTYPE_NODE,
104			"obsled",
105			NULL,
106			NULL, 0, NULL, 0,
107			CTL_HW, CTL_CREATE, CTL_EOL);
108	if (err  != 0)
109		return;
110	node_mib = node->sysctl_num;
111	err = sysctl_createv(NULL, 0,
112			NULL, (const struct sysctlnode **)&node,
113			CTLFLAG_READWRITE, CTLTYPE_INT,
114			led_name,
115			SYSCTL_DESCR("OpenBlockS LED state (0=off, 1=on)"),
116			obsled_sysctl_verify, 0, (void *)sc, 0,
117			CTL_HW, node_mib, CTL_CREATE, CTL_EOL);
118	if (err  != 0)
119		return;
120
121	sc->sc_led_state_mib = node->sysctl_num;
122#if 0
123	{
124		gpio_tag_t tag = sc->sc_tag;
125	 	(*(tag)->io_or_write)((tag)->cookie, sc->sc_addr, 0);
126	}
127#endif
128}
129
130static int
131obsled_sysctl_verify(SYSCTLFN_ARGS)
132{
133	struct obsled_softc *sc = rnode->sysctl_data;
134	struct sysctlnode node;
135	int err, state;
136
137	node = *rnode;
138	state = sc->sc_led_state;
139	node.sysctl_data = &state;
140
141	err = sysctl_lookup(SYSCTLFN_CALL(&node));
142	if (err != 0 || newp == NULL)
143		return err;
144
145	if (node.sysctl_num == sc->sc_led_state_mib) {
146		if (state < 0 || state > 1)
147			return EINVAL;
148		sc->sc_led_state = state;
149		obsled_set_state(sc);
150	}
151
152	return 0;
153}
154
155static void
156obsled_set_state(struct obsled_softc *sc)
157{
158	gpio_tag_t tag = sc->sc_tag;
159
160	(*(tag)->io_or_write)((tag)->cookie,
161				sc->sc_addr,
162				(~(sc->sc_led_state) & 1));
163	/* GPIO LED input ON=0/OFF=1 */
164}
165
166/*
167 * Setting LED interface for inside kernel.
168 * Argument `led' is 3-bit LED state (led=0-7/ON=1/OFF=0).
169 */
170void
171obs266_led_set(int led)
172{
173	device_t dv;
174	deviter_t di;
175
176	/*
177	 * Searching "obsled" devices from device tree.
178	 * Do you have a better idea?
179	 */
180        for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST); dv != NULL;
181	     dv = deviter_next(&di)) {
182		if (device_is_a(dv, "obsles")) {
183			struct obsled_softc *sc = device_private(dv);
184			sc->sc_led_state =
185			    (led & (1 << device_unit(dv))) >> device_unit(dv);
186			obsled_set_state(sc);
187		}
188	}
189	deviter_release(&di);
190}
191