projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* $Id: power.c,v 1.10 2001/12/11 01:57:16 davem Exp $ |
| 2 | * power.c: Power management driver. | |
| 3 | * | |
| 4 | * Copyright (C) 1999 David S. Miller (davem@redhat.com) | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/config.h> | |
| 8 | #include <linux/kernel.h> | |
| 9 | #include <linux/module.h> | |
| 10 | #include <linux/init.h> | |
| 11 | #include <linux/sched.h> | |
| 12 | #include <linux/signal.h> | |
| 13 | #include <linux/delay.h> | |
| 14 | #include <linux/interrupt.h> | |
| 15 | ||
| 16 | #include <asm/system.h> | |
| 17 | #include <asm/ebus.h> | |
| 18 | #include <asm/auxio.h> | |
| 19 | ||
| 20 | #define __KERNEL_SYSCALLS__ | |
| 21 | #include <linux/unistd.h> | |
| 22 | ||
| 23 | /* | |
| 24 | * sysctl - toggle power-off restriction for serial console | |
| 25 | * systems in machine_power_off() | |
| 26 | */ | |
| 27 | int scons_pwroff = 1; | |
| 28 | ||
| 29 | #ifdef CONFIG_PCI | |
| 30 | static void __iomem *power_reg; | |
| 31 | ||
| 32 | static DECLARE_WAIT_QUEUE_HEAD(powerd_wait); | |
| 33 | static int button_pressed; | |
| 34 | ||
| 35 | static irqreturn_t power_handler(int irq, void *dev_id, struct pt_regs *regs) | |
| 36 | { | |
| 37 | if (button_pressed == 0) { | |
| 38 | button_pressed = 1; | |
| 39 | wake_up(&powerd_wait); | |
| 40 | } | |
| 41 | ||
| 42 | /* FIXME: Check registers for status... */ | |
| 43 | return IRQ_HANDLED; | |
| 44 | } | |
| 45 | #endif /* CONFIG_PCI */ | |
| 46 | ||
| 47 | extern void machine_halt(void); | |
| 48 | extern void machine_alt_power_off(void); | |
| 49 | static void (*poweroff_method)(void) = machine_alt_power_off; | |
| 50 | ||
| 51 | void machine_power_off(void) | |
| 52 | { | |
| 53 | if (!serial_console || scons_pwroff) { | |
| 54 | #ifdef CONFIG_PCI | |
| 55 | if (power_reg) { | |
| 56 | /* Both register bits seem to have the | |
| 57 | * same effect, so until I figure out | |
| 58 | * what the difference is... | |
| 59 | */ | |
| 60 | writel(AUXIO_PCIO_CPWR_OFF | AUXIO_PCIO_SPWR_OFF, power_reg); | |
| 61 | } else | |
| 62 | #endif /* CONFIG_PCI */ | |
| 63 | if (poweroff_method != NULL) { | |
| 64 | poweroff_method(); | |
| 65 | /* not reached */ | |
| 66 | } | |
| 67 | } | |
| 68 | machine_halt(); | |
| 69 | } | |
| 70 | ||
| 71 | EXPORT_SYMBOL(machine_power_off); | |
| 72 | ||
| 73 | #ifdef CONFIG_PCI | |
| 74 | static int powerd(void *__unused) | |
| 75 | { | |
| 76 | static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; | |
| 77 | char *argv[] = { "/sbin/shutdown", "-h", "now", NULL }; | |
| 78 | DECLARE_WAITQUEUE(wait, current); | |
| 79 | ||
| 80 | daemonize("powerd"); | |
| 81 | ||
| 82 | add_wait_queue(&powerd_wait, &wait); | |
| 83 | again: | |
| 84 | for (;;) { | |
| 85 | set_task_state(current, TASK_INTERRUPTIBLE); | |
| 86 | if (button_pressed) | |
| 87 | break; | |
| 88 | flush_signals(current); | |
| 89 | schedule(); | |
| 90 | } | |
| 91 | __set_current_state(TASK_RUNNING); | |
| 92 | remove_wait_queue(&powerd_wait, &wait); | |
| 93 | ||
| 94 | /* Ok, down we go... */ | |
| 95 | button_pressed = 0; | |
| 96 | if (execve("/sbin/shutdown", argv, envp) < 0) { | |
| 97 | printk("powerd: shutdown execution failed\n"); | |
| 98 | add_wait_queue(&powerd_wait, &wait); | |
| 99 | goto again; | |
| 100 | } | |
| 101 | return 0; | |
| 102 | } | |
| 103 | ||
| 104 | static int __init has_button_interrupt(struct linux_ebus_device *edev) | |
| 105 | { | |
| 106 | if (edev->irqs[0] == PCI_IRQ_NONE) | |
| 107 | return 0; | |
| 108 | if (!prom_node_has_property(edev->prom_node, "button")) | |
| 109 | return 0; | |
| 110 | ||
| 111 | return 1; | |
| 112 | } | |
| 113 | ||
| 114 | void __init power_init(void) | |
| 115 | { | |
| 116 | struct linux_ebus *ebus; | |
| 117 | struct linux_ebus_device *edev; | |
| 118 | static int invoked; | |
| 119 | ||
| 120 | if (invoked) | |
| 121 | return; | |
| 122 | invoked = 1; | |
| 123 | ||
| 124 | for_each_ebus(ebus) { | |
| 125 | for_each_ebusdev(edev, ebus) { | |
| 126 | if (!strcmp(edev->prom_name, "power")) | |
| 127 | goto found; | |
| 128 | } | |
| 129 | } | |
| 130 | return; | |
| 131 | ||
| 132 | found: | |
| 133 | power_reg = ioremap(edev->resource[0].start, 0x4); | |
| 134 | printk("power: Control reg at %p ... ", power_reg); | |
| 135 | poweroff_method = machine_halt; /* able to use the standard halt */ | |
| 136 | if (has_button_interrupt(edev)) { | |
| 137 | if (kernel_thread(powerd, NULL, CLONE_FS) < 0) { | |
| 138 | printk("Failed to start power daemon.\n"); | |
| 139 | return; | |
| 140 | } | |
| 141 | printk("powerd running.\n"); | |
| 142 | ||
| 143 | if (request_irq(edev->irqs[0], | |
| 144 | power_handler, SA_SHIRQ, "power", NULL) < 0) | |
| 145 | printk("power: Error, cannot register IRQ handler.\n"); | |
| 146 | } else { | |
| 147 | printk("not using powerd.\n"); | |
| 148 | } | |
| 149 | } | |
| 150 | #endif /* CONFIG_PCI */ |