14645ebabd
* Convert GPIO and IRQ handling to use the <asm/gpio.h> api. * Perform the reset only after the power button has been held down for at least two seconds. Do the reset on the release of the power button, so that NAS devices which have been set to auto-power-on (by solder bridging the power button) do not continuously power cycle. * Remove all superflous constants from nas100d.h * Add LED constants to nas100d.h while we're there. * Update the board LED setup code to use those constants. Signed-off-by: Rod Whitby <rod@whitby.id.au> Acked-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/*
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* arch/arm/mach-ixp4xx/nas100d-power.c
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*
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* NAS 100d Power/Reset driver
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*
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* Copyright (C) 2005 Tower Technologies
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*
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* based on nas100d-io.c
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* Copyright (C) 2004 Karen Spearel
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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* Maintainers: http://www.nslu2-linux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <asm/gpio.h>
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#include <asm/mach-types.h>
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/* This is used to make sure the power-button pusher is serious. The button
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* must be held until the value of this counter reaches zero.
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*/
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static int power_button_countdown;
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/* Must hold the button down for at least this many counts to be processed */
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#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
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static void nas100d_power_handler(unsigned long data);
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static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
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static void nas100d_power_handler(unsigned long data)
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{
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/* This routine is called twice per second to check the
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* state of the power button.
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*/
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if (gpio_get_value(NAS100D_PB_GPIO)) {
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/* IO Pin is 1 (button pushed) */
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if (power_button_countdown > 0)
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power_button_countdown--;
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} else {
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/* Done on button release, to allow for auto-power-on mods. */
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if (power_button_countdown == 0) {
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/* Signal init to do the ctrlaltdel action,
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* this will bypass init if it hasn't started
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* and do a kernel_restart.
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*/
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ctrl_alt_del();
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/* Change the state of the power LED to "blink" */
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gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
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} else {
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power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
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}
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}
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mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
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}
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static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
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{
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/* This is the paper-clip reset, it shuts the machine down directly. */
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machine_power_off();
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return IRQ_HANDLED;
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}
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static int __init nas100d_power_init(void)
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{
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if (!(machine_is_nas100d()))
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return 0;
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set_irq_type(gpio_to_irq(NAS100D_RB_GPIO), IRQT_LOW);
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if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
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IRQF_DISABLED, "NAS100D reset button", NULL) < 0) {
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printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
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gpio_to_irq(NAS100D_RB_GPIO));
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return -EIO;
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}
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/* The power button on the Iomega NAS100d is on GPIO 14, but
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* it cannot handle interrupts on that GPIO line. So we'll
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* have to poll it with a kernel timer.
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*/
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/* Make sure that the power button GPIO is set up as an input */
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gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
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/* Set the initial value for the power button IRQ handler */
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power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
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mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
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return 0;
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}
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static void __exit nas100d_power_exit(void)
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{
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if (!(machine_is_nas100d()))
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return;
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del_timer_sync(&nas100d_power_timer);
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free_irq(gpio_to_irq(NAS100D_RB_GPIO), NULL);
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}
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module_init(nas100d_power_init);
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module_exit(nas100d_power_exit);
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("NAS100D Power/Reset driver");
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MODULE_LICENSE("GPL");
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