1/*
2 * arch/sh/boards/landisk/psw.c
3 *
4 * push switch support for LANDISK and USL-5P
5 *
6 * Copyright (C) 2006-2007  Paul Mundt
7 * Copyright (C) 2007  kogiidena
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License.  See the file "COPYING" in the main directory of this archive
11 * for more details.
12 */
13#include <linux/io.h>
14#include <linux/init.h>
15#include <linux/interrupt.h>
16#include <linux/platform_device.h>
17#include <asm/landisk/iodata_landisk.h>
18#include <asm/push-switch.h>
19
20static irqreturn_t psw_irq_handler(int irq, void *arg)
21{
22	struct platform_device *pdev = arg;
23	struct push_switch *psw = platform_get_drvdata(pdev);
24	struct push_switch_platform_info *psw_info = pdev->dev.platform_data;
25	unsigned int sw_value;
26	int ret = 0;
27
28	sw_value = (0x0ff & (~ctrl_inb(PA_STATUS)));
29
30	/* Nothing to do if there's no state change */
31	if (psw->state) {
32		ret = 1;
33		goto out;
34	}
35
36	/* Figure out who raised it */
37	if (sw_value & (1 << psw_info->bit)) {
38		psw->state = 1;
39		mod_timer(&psw->debounce, jiffies + 50);
40		ret = 1;
41	}
42
43out:
44	/* Clear the switch IRQs */
45	ctrl_outb(0x00, PA_PWRINT_CLR);
46
47	return IRQ_RETVAL(ret);
48}
49
50static struct resource psw_power_resources[] = {
51	[0] = {
52		.start = IRQ_POWER,
53		.flags = IORESOURCE_IRQ,
54       },
55};
56
57static struct resource psw_usl5p_resources[] = {
58	[0] = {
59		.start = IRQ_BUTTON,
60		.flags = IORESOURCE_IRQ,
61	},
62};
63
64static struct push_switch_platform_info psw_power_platform_data = {
65	.name		= "psw_power",
66	.bit		= 4,
67	.irq_flags	= IRQF_SHARED,
68	.irq_handler	= psw_irq_handler,
69};
70
71static struct push_switch_platform_info psw1_platform_data = {
72	.name		= "psw1",
73	.bit		= 0,
74	.irq_flags	= IRQF_SHARED,
75	.irq_handler	= psw_irq_handler,
76};
77
78static struct push_switch_platform_info psw2_platform_data = {
79	.name		= "psw2",
80	.bit		= 2,
81	.irq_flags	= IRQF_SHARED,
82	.irq_handler	= psw_irq_handler,
83};
84
85static struct push_switch_platform_info psw3_platform_data = {
86	.name		= "psw3",
87	.bit		= 1,
88	.irq_flags	= IRQF_SHARED,
89	.irq_handler	= psw_irq_handler,
90};
91
92static struct platform_device psw_power_switch_device = {
93	.name		= "push-switch",
94	.id		= 0,
95	.num_resources	= ARRAY_SIZE(psw_power_resources),
96	.resource	= psw_power_resources,
97	.dev		= {
98		.platform_data = &psw_power_platform_data,
99	},
100};
101
102static struct platform_device psw1_switch_device = {
103	.name		= "push-switch",
104	.id		= 1,
105	.num_resources	= ARRAY_SIZE(psw_usl5p_resources),
106	.resource	= psw_usl5p_resources,
107	.dev		= {
108		.platform_data = &psw1_platform_data,
109	},
110};
111
112static struct platform_device psw2_switch_device = {
113	.name		= "push-switch",
114	.id		= 2,
115	.num_resources	= ARRAY_SIZE(psw_usl5p_resources),
116	.resource	= psw_usl5p_resources,
117	.dev		= {
118		.platform_data = &psw2_platform_data,
119	},
120};
121
122static struct platform_device psw3_switch_device = {
123	.name		= "push-switch",
124	.id		= 3,
125	.num_resources	= ARRAY_SIZE(psw_usl5p_resources),
126	.resource	= psw_usl5p_resources,
127	.dev = {
128		.platform_data = &psw3_platform_data,
129	},
130};
131
132static struct platform_device *psw_devices[] = {
133	&psw_power_switch_device,
134	&psw1_switch_device,
135	&psw2_switch_device,
136	&psw3_switch_device,
137};
138
139static int __init psw_init(void)
140{
141	return platform_add_devices(psw_devices, ARRAY_SIZE(psw_devices));
142}
143module_init(psw_init);
144