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-rw-r--r--arch/arm/mach-ixp4xx/nas100d-power.c128
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diff --git a/arch/arm/mach-ixp4xx/nas100d-power.c b/arch/arm/mach-ixp4xx/nas100d-power.c
deleted file mode 100644
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--- a/arch/arm/mach-ixp4xx/nas100d-power.c
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1/*
2 * arch/arm/mach-ixp4xx/nas100d-power.c
3 *
4 * NAS 100d Power/Reset driver
5 *
6 * Copyright (C) 2005 Tower Technologies
7 *
8 * based on nas100d-io.c
9 * Copyright (C) 2004 Karen Spearel
10 *
11 * Author: Alessandro Zummo <a.zummo@towertech.it>
12 * Maintainers: http://www.nslu2-linux.org/
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 *
18 */
19
20#include <linux/interrupt.h>
21#include <linux/irq.h>
22#include <linux/module.h>
23#include <linux/reboot.h>
24#include <linux/jiffies.h>
25#include <linux/timer.h>
26
27#include <asm/gpio.h>
28#include <asm/mach-types.h>
29
30/* This is used to make sure the power-button pusher is serious. The button
31 * must be held until the value of this counter reaches zero.
32 */
33static int power_button_countdown;
34
35/* Must hold the button down for at least this many counts to be processed */
36#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
37
38static void nas100d_power_handler(unsigned long data);
39static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
40
41static void nas100d_power_handler(unsigned long data)
42{
43 /* This routine is called twice per second to check the
44 * state of the power button.
45 */
46
47 if (gpio_get_value(NAS100D_PB_GPIO)) {
48
49 /* IO Pin is 1 (button pushed) */
50 if (power_button_countdown > 0)
51 power_button_countdown--;
52
53 } else {
54
55 /* Done on button release, to allow for auto-power-on mods. */
56 if (power_button_countdown == 0) {
57 /* Signal init to do the ctrlaltdel action,
58 * this will bypass init if it hasn't started
59 * and do a kernel_restart.
60 */
61 ctrl_alt_del();
62
63 /* Change the state of the power LED to "blink" */
64 gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
65 } else {
66 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
67 }
68 }
69
70 mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
71}
72
73static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
74{
75 /* This is the paper-clip reset, it shuts the machine down directly. */
76 machine_power_off();
77
78 return IRQ_HANDLED;
79}
80
81static int __init nas100d_power_init(void)
82{
83 if (!(machine_is_nas100d()))
84 return 0;
85
86 set_irq_type(gpio_to_irq(NAS100D_RB_GPIO), IRQT_LOW);
87
88 if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
89 IRQF_DISABLED, "NAS100D reset button", NULL) < 0) {
90
91 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
92 gpio_to_irq(NAS100D_RB_GPIO));
93
94 return -EIO;
95 }
96
97 /* The power button on the Iomega NAS100d is on GPIO 14, but
98 * it cannot handle interrupts on that GPIO line. So we'll
99 * have to poll it with a kernel timer.
100 */
101
102 /* Make sure that the power button GPIO is set up as an input */
103 gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
104
105 /* Set the initial value for the power button IRQ handler */
106 power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
107
108 mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
109
110 return 0;
111}
112
113static void __exit nas100d_power_exit(void)
114{
115 if (!(machine_is_nas100d()))
116 return;
117
118 del_timer_sync(&nas100d_power_timer);
119
120 free_irq(gpio_to_irq(NAS100D_RB_GPIO), NULL);
121}
122
123module_init(nas100d_power_init);
124module_exit(nas100d_power_exit);
125
126MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
127MODULE_DESCRIPTION("NAS100D Power/Reset driver");
128MODULE_LICENSE("GPL");