Merge with Linux 2.3.38.

1 files changed, 0 insertions, 1253 deletions

diff --git a/drivers/misc/acpi.c b/drivers/misc/acpi.c
deleted file mode 100644
index ffb05161a..000000000
--- a/drivers/misc/acpi.c
+++ /dev/null
@@ -1,1253 +0,0 @@
-/*
- *  acpi.c - Linux ACPI driver
- *
- *  Copyright (C) 1999 Andrew Henroid
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- */
-
-/*
- * See http://www.geocities.com/SiliconValley/Hardware/3165/
- * for the user-level ACPI stuff
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/miscdevice.h>
-#include <linux/sched.h>
-#include <linux/time.h>
-#include <linux/wait.h>
-#include <linux/spinlock.h>
-#include <linux/ioport.h>
-#include <linux/slab.h>
-#include <linux/pci.h>
-#include <asm/uaccess.h>
-#include <asm/io.h>
-#include <linux/sysctl.h>
-#include <linux/delay.h>
-#include <linux/acpi.h>
-
-/*
- * Defines for 2.2.x
- */
-#ifndef __exit
-#define __exit
-#endif
-#ifndef module_init
-#define module_init(x) int init_module(void) {return x();}
-#endif
-#ifndef module_exit
-#define module_exit(x) void cleanup_module(void) {x();}
-#endif
-#ifndef DECLARE_WAIT_QUEUE_HEAD
-#define DECLARE_WAIT_QUEUE_HEAD(x) struct wait_queue * x = NULL
-#endif
-
-/*
- * Yes, it's unfortunate that we are relying on get_cmos_time
- * because it is slow (> 1 sec.) and i386 only.	 It might be better
- * to use some of the code from drivers/char/rtc.c in the near future
- */
-extern unsigned long get_cmos_time(void);
-
-static int acpi_control_thread(void *context);
-static int acpi_do_ulong(ctl_table *ctl,
-			 int write,
-			 struct file *file,
-			 void *buffer,
-			 size_t *len);
-static int acpi_do_event_reg(ctl_table *ctl,
-			     int write,
-			     struct file *file,
-			     void *buffer,
-			     size_t *len);
-static int acpi_do_event(ctl_table *ctl,
-			 int write,
-			 struct file *file,
-			 void *buffer,
-			 size_t *len);
-static int acpi_do_sleep(ctl_table *ctl,
-			 int write,
-			 struct file *file,
-			 void *buffer,
-			 size_t *len);
-
-DECLARE_WAIT_QUEUE_HEAD(acpi_control_wait);
-
-static struct ctl_table_header *acpi_sysctl = NULL;
-
-static struct acpi_facp *acpi_facp = NULL;
-static int acpi_fake_facp = 0;
-static struct acpi_facs *acpi_facs = NULL;
-static unsigned long acpi_facp_addr = 0;
-static unsigned long acpi_dsdt_addr = 0;
-
-// current system sleep state (S0 - S4)
-static acpi_sstate_t acpi_sleep_state = ACPI_S0;
-// time sleep began
-static unsigned long acpi_sleep_start = 0;
-
-static spinlock_t acpi_event_lock = SPIN_LOCK_UNLOCKED;
-static volatile u32 acpi_pm1_status = 0;
-static volatile u32 acpi_gpe_status = 0;
-static volatile u32 acpi_gpe_level = 0;
-static volatile acpi_sstate_t acpi_event_state = ACPI_S0;
-static DECLARE_WAIT_QUEUE_HEAD(acpi_event_wait);
-
-static spinlock_t acpi_devs_lock = SPIN_LOCK_UNLOCKED;
-static LIST_HEAD(acpi_devs);
-
-/* Make it impossible to enter C2/C3 until after we've initialized */
-static unsigned long acpi_p_lvl2_lat = ACPI_INFINITE_LAT;
-static unsigned long acpi_p_lvl3_lat = ACPI_INFINITE_LAT;
-
-static unsigned long acpi_p_blk = 0;
-
-static int acpi_p_lvl2_tested = 0;
-static int acpi_p_lvl3_tested = 0;
-
-// bits 8-15 are SLP_TYPa, bits 0-7 are SLP_TYPb
-static unsigned long acpi_slp_typ[] = 
-{
-	ACPI_SLP_TYP_DISABLED, /* S0 */
-	ACPI_SLP_TYP_DISABLED, /* S1 */
-	ACPI_SLP_TYP_DISABLED, /* S2 */
-	ACPI_SLP_TYP_DISABLED, /* S3 */
-	ACPI_SLP_TYP_DISABLED, /* S4 */
-	ACPI_SLP_TYP_DISABLED  /* S5 */
-};
-
-static struct ctl_table acpi_table[] =
-{
-	{ACPI_FACP, "facp",
-	 &acpi_facp_addr, sizeof(acpi_facp_addr),
-	 0400, NULL, &acpi_do_ulong},
-
-	{ACPI_DSDT, "dsdt",
-	 &acpi_dsdt_addr, sizeof(acpi_dsdt_addr),
-	 0400, NULL, &acpi_do_ulong},
-
-	{ACPI_PM1_ENABLE, "pm1_enable",
-	 NULL, 0,
-	 0600, NULL, &acpi_do_event_reg},
-
-	{ACPI_GPE_ENABLE, "gpe_enable",
-	 NULL, 0,
-	 0600, NULL, &acpi_do_event_reg},
-
-	{ACPI_GPE_LEVEL, "gpe_level",
-	 NULL, 0,
-	 0600, NULL, &acpi_do_event_reg},
-
-	{ACPI_EVENT, "event", NULL, 0, 0400, NULL, &acpi_do_event},
-
-	{ACPI_P_BLK, "p_blk",
-	 &acpi_p_blk, sizeof(acpi_p_blk),
-	 0600, NULL, &acpi_do_ulong},
-
-	{ACPI_P_LVL2_LAT, "p_lvl2_lat",
-	 &acpi_p_lvl2_lat, sizeof(acpi_p_lvl2_lat),
-	 0644, NULL, &acpi_do_ulong},
-
-	{ACPI_P_LVL3_LAT, "p_lvl3_lat",
-	 &acpi_p_lvl3_lat, sizeof(acpi_p_lvl3_lat),
-	 0644, NULL, &acpi_do_ulong},
-
-	{ACPI_S0_SLP_TYP, "s0_slp_typ",
-	 &acpi_slp_typ[ACPI_S0], sizeof(acpi_slp_typ[ACPI_S0]),
-	 0600, NULL, &acpi_do_ulong},
-
-	{ACPI_S1_SLP_TYP, "s1_slp_typ",
-	 &acpi_slp_typ[ACPI_S1], sizeof(acpi_slp_typ[ACPI_S1]),
-	 0600, NULL, &acpi_do_ulong},
-
-	{ACPI_S5_SLP_TYP, "s5_slp_typ",
-	 &acpi_slp_typ[ACPI_S5], sizeof(acpi_slp_typ[ACPI_S5]),
-	 0600, NULL, &acpi_do_ulong},
-
-	{ACPI_SLEEP, "sleep", NULL, 0, 0600, NULL, &acpi_do_sleep},
-
-	{0}
-};
-
-static struct ctl_table acpi_dir_table[] =
-{
-	{CTL_ACPI, "acpi", NULL, 0, 0555, acpi_table},
-	{0}
-};
-
-
-/*
- * Get the value of the PM1 control register (SCI_EN, ...)
- */
-static u32 acpi_read_pm1_control(struct acpi_facp *facp)
-{
-	u32 value = 0;
-	if (facp->pm1a_cnt)
-		value = inw(facp->pm1a_cnt);
-	if (facp->pm1b_cnt)
-		value |= inw(facp->pm1b_cnt);
-	return value;
-}
-
-/*
- * Set the value of the PM1 control register (BM_RLD, ...)
- */
-static void acpi_write_pm1_control(struct acpi_facp *facp, u32 value)
-{
-	if (facp->pm1a_cnt)
-		outw(value, facp->pm1a_cnt);
-	if (facp->pm1b_cnt)
-		outw(value, facp->pm1b_cnt);
-}
-
-/*
- * Get the value of the fixed event status register
- */
-static u32 acpi_read_pm1_status(struct acpi_facp *facp)
-{
-	u32 value = 0;
-	if (facp->pm1a_evt)
-		value = inw(facp->pm1a_evt);
-	if (facp->pm1b_evt)
-		value |= inw(facp->pm1b_evt);
-	return value;
-}
-
-/*
- * Set the value of the fixed event status register (clear events)
- */
-static void acpi_write_pm1_status(struct acpi_facp *facp, u32 value)
-{
-	if (facp->pm1a_evt)
-		outw(value, facp->pm1a_evt);
-	if (facp->pm1b_evt)
-		outw(value, facp->pm1b_evt);
-}
-
-/*
- * Get the value of the fixed event enable register
- */
-static u32 acpi_read_pm1_enable(struct acpi_facp *facp)
-{
-	int offset = facp->pm1_evt_len >> 1;
-	u32 value = 0;
-	if (facp->pm1a_evt)
-		value = inw(facp->pm1a_evt + offset);
-	if (facp->pm1b_evt)
-		value |= inw(facp->pm1b_evt + offset);
-	return value;
-}
-
-/*
- * Set the value of the fixed event enable register (enable events)
- */
-static void acpi_write_pm1_enable(struct acpi_facp *facp, u32 value)
-{
-	int offset = facp->pm1_evt_len >> 1;
-	if (facp->pm1a_evt)
-		outw(value, facp->pm1a_evt + offset);
-	if (facp->pm1b_evt)
-		outw(value, facp->pm1b_evt + offset);
-}
-
-/*
- * Get the value of the general-purpose event status register
- */
-static u32 acpi_read_gpe_status(struct acpi_facp *facp)
-{
-	u32 value = 0;
-	int i, size;
-
-	if (facp->gpe1) {
-		size = facp->gpe1_len >> 1;
-		for (i = size - 1; i >= 0; i--)
-			value = (value << 8) | inb(facp->gpe1 + i);
-	}
-	if (facp->gpe0) {
-		size = facp->gpe0_len >> 1;
-		for (i = size - 1; i >= 0; i--)
-			value = (value << 8) | inb(facp->gpe0 + i);
-	}
-	return value;
-}
-
-/*
- * Set the value of the general-purpose event status register (clear events)
- */
-static void acpi_write_gpe_status(struct acpi_facp *facp, u32 value)
-{
-	int i, size;
-
-	if (facp->gpe0) {
-		size = facp->gpe0_len >> 1;
-		for (i = 0; i < size; i++) {
-			outb(value & 0xff, facp->gpe0 + i);
-			value >>= 8;
-		}
-	}
-	if (facp->gpe1) {
-		size = facp->gpe1_len >> 1;
-		for (i = 0; i < size; i++) {
-			outb(value & 0xff, facp->gpe1 + i);
-			value >>= 8;
-		}
-	}
-}
-
-/*
- * Get the value of the general-purpose event enable register
- */
-static u32 acpi_read_gpe_enable(struct acpi_facp *facp)
-{
-	u32 value = 0;
-	int i, size, offset;
-	
-	offset = facp->gpe0_len >> 1;
-	if (facp->gpe1) {
-		size = facp->gpe1_len >> 1;
-		for (i = size - 1; i >= 0; i--) {
-			value = (value << 8) | inb(facp->gpe1 + offset + i);
-		}
-	}
-	if (facp->gpe0) {
-		size = facp->gpe0_len >> 1;
-		for (i = size - 1; i >= 0; i--)
-			value = (value << 8) | inb(facp->gpe0 + offset + i);
-	}
-	return value;
-}
-
-/*
- * Set the value of the general-purpose event enable register (enable events)
- */
-static void acpi_write_gpe_enable(struct acpi_facp *facp, u32 value)
-{
-	int i, offset;
-
-	offset = facp->gpe0_len >> 1;
-	if (facp->gpe0) {
-		for (i = 0; i < offset; i++) {
-			outb(value & 0xff, facp->gpe0 + offset + i);
-			value >>= 8;
-		}
-	}
-	if (facp->gpe1) {
-		offset = facp->gpe1_len >> 1;
-		for (i = 0; i < offset; i++) {
-			outb(value & 0xff, facp->gpe1 + offset + i);
-			value >>= 8;
-		}
-	}
-}
-
-/*
- * Map an ACPI table into virtual memory
- */
-static struct acpi_table *__init acpi_map_table(u32 addr)
-{
-	struct acpi_table *table = NULL;
-	if (addr) {
-		// map table header to determine size
-		table = (struct acpi_table *)
-			ioremap((unsigned long) addr,
-				sizeof(struct acpi_table));
-		if (table) {
-			unsigned long table_size = table->length;
-			iounmap(table);
-			// remap entire table
-			table = (struct acpi_table *)
-				ioremap((unsigned long) addr, table_size);
-		}
-
-		if (!table) {
-			/* ioremap is a pain, it returns NULL if the
-			 * table starts within mapped physical memory.
-			 * Hopefully, no table straddles a mapped/unmapped
-			 * physical memory boundary, ugh
-			 */
-			table = (struct acpi_table*) phys_to_virt(addr);
-		}
-	}
-	return table;
-}
-
-/*
- * Unmap an ACPI table from virtual memory
- */
-static void acpi_unmap_table(struct acpi_table *table)
-{
-	// iounmap ignores addresses within physical memory
-	if (table)
-		iounmap(table);
-}
-
-/*
- * Locate and map ACPI tables
- */
-static int __init acpi_find_tables(void)
-{
-	struct acpi_rsdp *rsdp;
-	struct acpi_table *rsdt;
-	u32 *rsdt_entry;
-	int rsdt_entry_count;
-	unsigned long i;
-
-	// search BIOS memory for RSDP
-	for (i = ACPI_BIOS_ROM_BASE; i < ACPI_BIOS_ROM_END; i += 16) {
-		rsdp = (struct acpi_rsdp *) phys_to_virt(i);
-		if (rsdp->signature[0] == ACPI_RSDP1_SIG
-		    && rsdp->signature[1] == ACPI_RSDP2_SIG) {
-			char oem[7];
-			int j;
-
-			// strip trailing space and print OEM identifier
-			memcpy(oem, rsdp->oem, 6);
-			oem[6] = '\0';
-			for (j = 5;
-			     j > 0 && (oem[j] == '\0' || oem[j] == ' ');
-			     j--) {
-				oem[j] = '\0';
-			}
-			printk(KERN_INFO "ACPI: \"%s\" found at 0x%p\n",
-			       oem, (void *) i);
-
-			break;
-		}
-	}
-	if (i >= ACPI_BIOS_ROM_END)
-		return -ENODEV;
-
-	// fetch RSDT from RSDP
-	rsdt = acpi_map_table(rsdp->rsdt);
-	if (!rsdt) {
-		printk(KERN_ERR "ACPI: missing RSDT at 0x%p\n",
-		       (void*) rsdp->rsdt);
-		return -ENODEV;
-	}
-	else if (rsdt->signature != ACPI_RSDT_SIG) {
-		printk(KERN_ERR "ACPI: bad RSDT at 0x%p (%08x)\n",
-		       (void*) rsdp->rsdt, (unsigned) rsdt->signature);
-		acpi_unmap_table(rsdt);
-		return -ENODEV;
-	}
-	// search RSDT for FACP
-	acpi_facp = NULL;
-	rsdt_entry = (u32 *) (rsdt + 1);
-	rsdt_entry_count = (int) ((rsdt->length - sizeof(*rsdt)) >> 2);
-	while (rsdt_entry_count) {
-		struct acpi_table *dt = acpi_map_table(*rsdt_entry);
-		if (dt && dt->signature == ACPI_FACP_SIG) {
-			acpi_facp = (struct acpi_facp*) dt;
-			acpi_facp_addr = *rsdt_entry;
-			acpi_dsdt_addr = acpi_facp->dsdt;
-
-			// map FACS if it exists
-			if (acpi_facp->facs) {
-				dt = acpi_map_table(acpi_facp->facs);
-				if (dt && dt->signature == ACPI_FACS_SIG) {
-					acpi_facs = (struct acpi_facs*) dt;
-				}
-				else {
-					acpi_unmap_table(dt);
-				}
-			}
-		}
-		else {
-			acpi_unmap_table(dt);
-		}
-		rsdt_entry++;
-		rsdt_entry_count--;
-	}
-
-	acpi_unmap_table(rsdt);
-
-	if (!acpi_facp) {
-		printk(KERN_ERR "ACPI: missing FACP\n");
-		return -ENODEV;
-	}
-	return 0;
-}
-
-/*
- * Unmap or destroy ACPI tables
- */
-static void acpi_destroy_tables(void)
-{
-	if (!acpi_fake_facp)
-		acpi_unmap_table((struct acpi_table*) acpi_facp);
-	else
-		kfree(acpi_facp);
-	acpi_unmap_table((struct acpi_table*) acpi_facs);
-}
-
-/*
- * Locate PIIX4 device and create a fake FACP
- */
-static int __init acpi_find_piix4(void)
-{
-	struct pci_dev *dev;
-	u32 base;
-	u16 cmd;
-	u8 pmregmisc;
-
-	dev = pci_find_device(PCI_VENDOR_ID_INTEL,
-			      PCI_DEVICE_ID_INTEL_82371AB_3,
-			      NULL);
-	if (!dev)
-		return -ENODEV;
-	
-	pci_read_config_word(dev, PCI_COMMAND, &cmd);
-	if (!(cmd & PCI_COMMAND_IO))
-		return -ENODEV;
-	
-	pci_read_config_byte(dev, ACPI_PIIX4_PMREGMISC, &pmregmisc);
-	if (!(pmregmisc & ACPI_PIIX4_PMIOSE))
-		return -ENODEV;
-	
-	pci_read_config_dword(dev, 0x40, &base);
-	if (!(base & PCI_BASE_ADDRESS_SPACE_IO))
-		return -ENODEV;
-	
-	base &= PCI_BASE_ADDRESS_IO_MASK;
-	if (!base)
-		return -ENODEV;
-
-	printk(KERN_INFO "ACPI: found PIIX4 at 0x%04x\n", base);
-
-	acpi_facp = kmalloc(sizeof(struct acpi_facp), GFP_KERNEL);
-	if (!acpi_facp)
-		return -ENOMEM;
-
-	acpi_fake_facp = 1;
-	memset(acpi_facp, 0, sizeof(struct acpi_facp));
-	acpi_facp->int_model = ACPI_PIIX4_INT_MODEL;
-	acpi_facp->sci_int = ACPI_PIIX4_SCI_INT;
-	acpi_facp->smi_cmd = ACPI_PIIX4_SMI_CMD;
-	acpi_facp->acpi_enable = ACPI_PIIX4_ACPI_ENABLE;
-	acpi_facp->acpi_disable = ACPI_PIIX4_ACPI_DISABLE;
-	acpi_facp->s4bios_req = ACPI_PIIX4_S4BIOS_REQ;
-	acpi_facp->pm1a_evt = base + ACPI_PIIX4_PM1_EVT;
-	acpi_facp->pm1a_cnt = base + ACPI_PIIX4_PM1_CNT;
-	acpi_facp->pm2_cnt = ACPI_PIIX4_PM2_CNT;
-	acpi_facp->pm_tmr = base + ACPI_PIIX4_PM_TMR;
-	acpi_facp->gpe0 = base + ACPI_PIIX4_GPE0;
-	acpi_facp->pm1_evt_len = ACPI_PIIX4_PM1_EVT_LEN;
-	acpi_facp->pm1_cnt_len = ACPI_PIIX4_PM1_CNT_LEN;
-	acpi_facp->pm2_cnt_len = ACPI_PIIX4_PM2_CNT_LEN;
-	acpi_facp->pm_tm_len = ACPI_PIIX4_PM_TM_LEN;
-	acpi_facp->gpe0_len = ACPI_PIIX4_GPE0_LEN;
-	acpi_facp->p_lvl2_lat = (__u16) ACPI_INFINITE_LAT;
-	acpi_facp->p_lvl3_lat = (__u16) ACPI_INFINITE_LAT;
-
-	acpi_facp_addr = virt_to_phys(acpi_facp);
-	acpi_dsdt_addr = 0;
-
-	acpi_p_blk = base + ACPI_PIIX4_P_BLK;
-
-	return 0;
-}
-
-/*
- * Handle an ACPI SCI (fixed or general purpose event)
- */
-static void acpi_irq(int irq, void *dev_id, struct pt_regs *regs)
-{
-	u32 pm1_status, gpe_status, gpe_level, gpe_edge;
-	unsigned long flags;
-
-	// detect and clear fixed events
-	pm1_status = (acpi_read_pm1_status(acpi_facp)
-		      & acpi_read_pm1_enable(acpi_facp));
-	acpi_write_pm1_status(acpi_facp, pm1_status);
-	
-	// detect and handle general-purpose events
-	gpe_status = (acpi_read_gpe_status(acpi_facp)
-		      & acpi_read_gpe_enable(acpi_facp));
-	gpe_level = gpe_status & acpi_gpe_level;
-	if (gpe_level) {
-		// disable level-triggered events (re-enabled after handling)
-		acpi_write_gpe_enable(
-			acpi_facp,
-			acpi_read_gpe_enable(acpi_facp) & ~gpe_level);
-	}
-	gpe_edge = gpe_status & ~gpe_level;
-	if (gpe_edge) {
-		// clear edge-triggered events
-		while (acpi_read_gpe_status(acpi_facp) & gpe_edge)
-			acpi_write_gpe_status(acpi_facp, gpe_edge);
-	}
-
-	// notify process waiting on /dev/acpi
-	spin_lock_irqsave(&acpi_event_lock, flags);
-	acpi_pm1_status |= pm1_status;
-	acpi_gpe_status |= gpe_status;
-	spin_unlock_irqrestore(&acpi_event_lock, flags);
-	acpi_event_state = acpi_sleep_state;
-	wake_up_interruptible(&acpi_event_wait);
-}
-
-/*
- * Is ACPI enabled or not?
- */
-static inline int acpi_is_enabled(struct acpi_facp *facp)
-{
-	return ((acpi_read_pm1_control(facp) & ACPI_SCI_EN) ? 1:0);
-}
-
-/*
- * Enable SCI
- */
-static int acpi_enable(struct acpi_facp *facp)
-{
-	if (facp->smi_cmd)
-		outb(facp->acpi_enable, facp->smi_cmd);
-	return (acpi_is_enabled(facp) ? 0:-1);
-}
-
-/*
- * Disable SCI
- */
-static int acpi_disable(struct acpi_facp *facp)
-{
-	// disable and clear any pending events
-	acpi_write_gpe_enable(facp, 0);
-	while (acpi_read_gpe_status(facp))
-		acpi_write_gpe_status(facp, acpi_read_gpe_status(facp));
-	acpi_write_pm1_enable(facp, 0);
-	acpi_write_pm1_status(facp, acpi_read_pm1_status(facp));
-
-	/* writing acpi_disable to smi_cmd would be appropriate
-	 * here but this causes a nasty crash on many systems
-	 */
-
-	return 0;
-}
-
-/*
- * Idle loop (uniprocessor only)
- */
-static void acpi_idle_handler(void)
-{
-	static int sleep_level = 1;
-	u32 pm1_cnt, timer, pm2_cnt, bm_active;
-	unsigned long time, usec;
-
-	// return to C0 on bus master request (necessary for C3 only)
-	pm1_cnt = acpi_read_pm1_control(acpi_facp);
-	if (sleep_level == 3) {
-		if (!(pm1_cnt & ACPI_BM_RLD)) {
-			pm1_cnt |= ACPI_BM_RLD;
-			acpi_write_pm1_control(acpi_facp, pm1_cnt);
-		}
-	}
-	else {
-		if (pm1_cnt & ACPI_BM_RLD) {
-			pm1_cnt &= ~ACPI_BM_RLD;
-			acpi_write_pm1_control(acpi_facp, pm1_cnt);
-		}
-	}
-
-	// clear bus master activity flag
-	acpi_write_pm1_status(acpi_facp, ACPI_BM);
-
-	// get current time (fallback to CPU cycles if no PM timer)
-	timer = acpi_facp->pm_tmr;
-	if (timer)
-		time = inl(timer);
-	else
-		time = get_cycles();
-
-	// sleep
-	switch (sleep_level) {
-	case 1:
-		__asm__ __volatile__("sti ; hlt": : :"memory");
-		break;
-	case 2:
-		inb(acpi_p_blk + ACPI_P_LVL2);
-		break;
-	case 3:
-		pm2_cnt = acpi_facp->pm2_cnt;
-		if (pm2_cnt) {
-			/* Disable PCI arbitration while sleeping,
-			   to avoid DMA corruption? */
-			outb(inb(pm2_cnt) | ACPI_ARB_DIS, pm2_cnt);
-			inb(acpi_p_blk + ACPI_P_LVL3);
-			outb(inb(pm2_cnt) & ~ACPI_ARB_DIS, pm2_cnt);
-		}
-		else {
-			inb(acpi_p_blk + ACPI_P_LVL3);
-		}
-		break;
-	}
-
-	// calculate time spent sleeping (fallback to CPU cycles)
-	if (timer)
-		time = (inl(timer) - time) & ACPI_TMR_MASK;
-	else
-		time = ACPI_CPU_TO_TMR_TICKS(get_cycles() - time);
-
-	// check for bus master activity
-	bm_active = (acpi_read_pm1_status(acpi_facp) & ACPI_BM);
-
-	// record working C2/C3
-	if (sleep_level == 2 && !acpi_p_lvl2_tested) {
-		acpi_p_lvl2_tested = 1;
-		printk(KERN_INFO "ACPI: C2 works\n");
-	}
-	else if (sleep_level == 3 && !acpi_p_lvl3_tested) {
-		acpi_p_lvl3_tested = 1;
-		printk(KERN_INFO "ACPI: C3 works\n");
-	}
-
-	// pick next C-state based on time spent sleeping,
-	// C-state latencies, and bus master activity
-	sleep_level = 1;
-	if (acpi_p_blk) {
-		usec = ACPI_TMR_TICKS_TO_uS(time);
-		if (usec > acpi_p_lvl3_lat && !bm_active)
-			sleep_level = 3;
-		else if (usec > acpi_p_lvl2_lat)
-			sleep_level = 2;
-	}
-}
-
-/*
- * Put all devices into specified D-state
- */
-static int acpi_enter_dx(acpi_dstate_t state)
-{
-	int status = 0;
-	struct list_head *i = acpi_devs.next;
-
-	while (i != &acpi_devs)	{
-		struct acpi_dev *dev = list_entry(i, struct acpi_dev, entry);
-		if (dev->state != state) {
-			int dev_status = 0;
-			if (dev->info.transition)
-				dev_status = dev->info.transition(dev, state);
-			if (!dev_status) {
-				// put hardware into D-state
-				dev->state = state;
-			}
-			if (dev_status)
-				status = dev_status;
-		}
-
-		i = i->next;
-	}
-
-	return status;
-}
-
-/*
- * Update system time from real-time clock
- */
-static void acpi_update_clock(void)
-{
-	if (acpi_sleep_start) {
-		unsigned long delta;
-		struct timeval tv;
-		
-		delta = get_cmos_time() - acpi_sleep_start;
-		do_gettimeofday(&tv);
-		tv.tv_sec += delta;
-		do_settimeofday(&tv);
-		
-		acpi_sleep_start = 0;
-	}
-}
-
-
-/*
- * Enter system sleep state
- */
-static void acpi_enter_sx(acpi_sstate_t state)
-{
-	unsigned long slp_typ = acpi_slp_typ[(int) state];
-	if (slp_typ != ACPI_SLP_TYP_DISABLED) {
-		u16 typa, typb, value;
-
-		// bits 8-15 are SLP_TYPa, bits 0-7 are SLP_TYPb
-		typa = (slp_typ >> 8) & 0xff;
-		typb = slp_typ & 0xff;
-
-		typa = ((typa << ACPI_SLP_TYP_SHIFT) & ACPI_SLP_TYP_MASK);
-		typb = ((typb << ACPI_SLP_TYP_SHIFT) & ACPI_SLP_TYP_MASK);
-
-		if (state != ACPI_S0) {
-			acpi_sleep_start = get_cmos_time();
-			acpi_enter_dx(ACPI_D3);
-			acpi_sleep_state = state;
-		}
-
-		// clear wake status
-		acpi_write_pm1_status(acpi_facp, ACPI_WAK);
-
-		// set SLP_TYPa/b and SLP_EN
-		if (acpi_facp->pm1a_cnt) {
-			value = inw(acpi_facp->pm1a_cnt) & ~ACPI_SLP_TYP_MASK;
-			outw(value | typa | ACPI_SLP_EN, acpi_facp->pm1a_cnt);
-		}
-		if (acpi_facp->pm1b_cnt) {
-			value = inw(acpi_facp->pm1b_cnt) & ~ACPI_SLP_TYP_MASK;
-			outw(value | typb | ACPI_SLP_EN, acpi_facp->pm1b_cnt);
-		}
-
-		if (state == ACPI_S0) {
-			acpi_sleep_state = state;
-			acpi_enter_dx(ACPI_D0);
-			acpi_sleep_start = 0;
-		}
-		else if (state == ACPI_S1) {
-			// wait until S1 is entered
-			while (!(acpi_read_pm1_status(acpi_facp) & ACPI_WAK)) ;
-			// finished sleeping, update system time
-			acpi_update_clock();
-		}
-	}
-}
-
-/*
- * Enter soft-off (S5)
- */
-static void acpi_power_off_handler(void)
-{
-	acpi_enter_sx(ACPI_S5);
-}
-
-/*
- * Claim ACPI I/O ports
- */
-static int acpi_claim_ioports(struct acpi_facp *facp)
-{
-	// we don't get a guarantee of contiguity for any of the ACPI registers
-	if (facp->pm1a_evt)
-		request_region(facp->pm1a_evt, facp->pm1_evt_len, "acpi");
-	if (facp->pm1b_evt)
-		request_region(facp->pm1b_evt, facp->pm1_evt_len, "acpi");
-	if (facp->pm1a_cnt)
-		request_region(facp->pm1a_cnt, facp->pm1_cnt_len, "acpi");
-	if (facp->pm1b_cnt)
-		request_region(facp->pm1b_cnt, facp->pm1_cnt_len, "acpi");
-	if (facp->pm_tmr)
-		request_region(facp->pm_tmr, facp->pm_tm_len, "acpi");
-	if (facp->gpe0)
-		request_region(facp->gpe0, facp->gpe0_len, "acpi");
-	if (facp->gpe1)
-		request_region(facp->gpe1, facp->gpe1_len, "acpi");
-
-	return 0;
-}
-
-/*
- * Free ACPI I/O ports
- */
-static int acpi_release_ioports(struct acpi_facp *facp)
-{
-	// we don't get a guarantee of contiguity for any of the ACPI registers
-	if (facp->pm1a_evt)
-		release_region(facp->pm1a_evt, facp->pm1_evt_len);
-	if (facp->pm1b_evt)
-		release_region(facp->pm1b_evt, facp->pm1_evt_len);
-	if (facp->pm1a_cnt)
-		release_region(facp->pm1a_cnt, facp->pm1_cnt_len);
-	if (facp->pm1b_cnt)
-		release_region(facp->pm1b_cnt, facp->pm1_cnt_len);
-	if (facp->pm_tmr)
-		release_region(facp->pm_tmr, facp->pm_tm_len);
-	if (facp->gpe0)
-		release_region(facp->gpe0, facp->gpe0_len);
-	if (facp->gpe1)
-		release_region(facp->gpe1, facp->gpe1_len);
-
-	return 0;
-}
-
-/*
- * Examine/modify value
- */
-static int acpi_do_ulong(ctl_table *ctl,
-			 int write,
-			 struct file *file,
-			 void *buffer,
-			 size_t *len)
-{
-	char str[2 * sizeof(unsigned long) + 4], *strend;
-	unsigned long val;
-	int size;
-
-	if (!write) {
-		if (file->f_pos) {
-			*len = 0;
-			return 0;
-		}
-
-		val = *(unsigned long*) ctl->data;
-		size = sprintf(str, "0x%08lx\n", val);
-		if (*len >= size) {
-			copy_to_user(buffer, str, size);
-			*len = size;
-		}
-		else
-			*len = 0;
-	}
-	else {
-		size = sizeof(str) - 1;
-		if (size > *len)
-			size = *len;
-		copy_from_user(str, buffer, size);
-		str[size] = '\0';
-		val = simple_strtoul(str, &strend, 0);
-		if (strend == str)
-			return -EINVAL;
-		*(unsigned long*) ctl->data = val;
-	}
-
-	file->f_pos += *len;
-	return 0;
-}
-
-/*
- * Examine/modify event register
- */
-static int acpi_do_event_reg(ctl_table *ctl,
-			     int write,
-			     struct file *file,
-			     void *buffer,
-			     size_t *len)
-{
-	char str[2 * sizeof(u32) + 4], *strend;
-	u32 val, enabling;
-	int size;
-
-	if (!write) {
-		if (file->f_pos) {
-			*len = 0;
-			return 0;
-		}
-
-		val = 0;
-		switch (ctl->ctl_name) {
-		case ACPI_PM1_ENABLE:
-			val = acpi_read_pm1_enable(acpi_facp);
-			break;
-		case ACPI_GPE_ENABLE:
-			val = acpi_read_gpe_enable(acpi_facp);
-			break;
-		case ACPI_GPE_LEVEL:
-			val = acpi_gpe_level;
-			break;
-		}
-		
-		size = sprintf(str, "0x%08x\n", val);
-		if (*len >= size) {
-			copy_to_user(buffer, str, size);
-			*len = size;
-		}
-		else
-			*len = 0;
-	}
-	else
-	{
-		// fetch user value
-		size = sizeof(str) - 1;
-		if (size > *len)
-			size = *len;
-		copy_from_user(str, buffer, size);
-		str[size] = '\0';
-		val = (u32) simple_strtoul(str, &strend, 0);
-		if (strend == str)
-			return -EINVAL;
-
-		// store value in register
-		switch (ctl->ctl_name) {
-		case ACPI_PM1_ENABLE:
-			// clear previously disabled events
-			enabling = (val
-				    & ~acpi_read_pm1_enable(acpi_facp));
-			acpi_write_pm1_status(acpi_facp, enabling);
-			
-			if (val) {
-				// enable ACPI unless it is already
-				if (!acpi_is_enabled(acpi_facp))
-					acpi_enable(acpi_facp);
-			}
-			else if (!acpi_read_gpe_enable(acpi_facp)) {
-				// disable ACPI unless it is already
-				if (acpi_is_enabled(acpi_facp))
-					acpi_disable(acpi_facp);
-			}
-			
-			acpi_write_pm1_enable(acpi_facp, val);
-			break;
-		case ACPI_GPE_ENABLE:
-			// clear previously disabled events
-			enabling = (val
-				    & ~acpi_read_gpe_enable(acpi_facp));
-			while (acpi_read_gpe_status(acpi_facp) & enabling)
-				acpi_write_gpe_status(acpi_facp, enabling);
-			
-			if (val) {
-				// enable ACPI unless it is already
-				if (!acpi_is_enabled(acpi_facp))
-					acpi_enable(acpi_facp);
-			}
-			else if (!acpi_read_pm1_enable(acpi_facp)) {
-				// disable ACPI unless it is already
-				if (acpi_is_enabled(acpi_facp))
-					acpi_disable(acpi_facp);
-			}
-			
-			acpi_write_gpe_enable(acpi_facp, val);
-			break;
-		case ACPI_GPE_LEVEL:
-			acpi_gpe_level = val;
-			break;
-		}
-	}
-
-	file->f_pos += *len;
-	return 0;
-}
-
-/*
- * Wait for next event
- */
-static int acpi_do_event(ctl_table *ctl,
-			 int write,
-			 struct file *file,
-			 void *buffer,
-			 size_t *len)
-{
-	u32 pm1_status = 0, gpe_status = 0;
-	acpi_sstate_t event_state = 0;
-	char str[27];
-	int size;
-
-	if (write)
-		return -EPERM;
-	if (*len < sizeof(str)) {
-		*len = 0;
-		return 0;
-	}
-
-	for (;;) {
-		unsigned long flags;
-		
-		// we need an atomic exchange here
-		spin_lock_irqsave(&acpi_event_lock, flags);
-		pm1_status = acpi_pm1_status;
-		acpi_pm1_status = 0;
-		gpe_status = acpi_gpe_status;
-		acpi_gpe_status = 0;
-		spin_unlock_irqrestore(&acpi_event_lock, flags);
-		event_state = acpi_event_state;
-		
-		if (pm1_status || gpe_status)
-			break;
-		
-		// wait for an event to arrive
-		interruptible_sleep_on(&acpi_event_wait);
-		if (signal_pending(current))
-			return -ERESTARTSYS;
-	}
-
-	size = sprintf(str, "0x%08x 0x%08x 0x%01x\n",
-		       pm1_status,
-		       gpe_status,
-		       event_state);
-	copy_to_user(buffer, str, size);
-	*len = size;
-	file->f_pos += size;
-
-	return 0;
-}
-
-/*
- * Enter system sleep state
- */
-static int acpi_do_sleep(ctl_table *ctl,
-			 int write,
-			 struct file *file,
-			 void *buffer,
-			 size_t *len)
-{
-	if (!write) {
-		if (file->f_pos) {
-			*len = 0;
-			return 0;
-		}
-	}
-	else
-	{
-		acpi_enter_sx(ACPI_S1);
-		acpi_enter_sx(ACPI_S0);
-	}
-	file->f_pos += *len;
-	return 0;
-}
-
-/*
- * Initialize and enable ACPI
- */
-static int __init acpi_init(void)
-{
-	int pid;
-
-	if (acpi_find_tables() && acpi_find_piix4()) {
-		// no ACPI tables and not PIIX4
-		return -ENODEV;
-	}
-
-	if (acpi_facp->p_lvl2_lat
-	    && acpi_facp->p_lvl2_lat <= ACPI_MAX_P_LVL2_LAT) {
-		acpi_p_lvl2_lat = acpi_facp->p_lvl2_lat;
-	}
-	if (acpi_facp->p_lvl3_lat
-	    && acpi_facp->p_lvl3_lat <= ACPI_MAX_P_LVL3_LAT) {
-		acpi_p_lvl3_lat = acpi_facp->p_lvl3_lat;
-	}
-
-	if (acpi_facp->sci_int
-	    && request_irq(acpi_facp->sci_int,
-			   acpi_irq,
-			   SA_INTERRUPT | SA_SHIRQ,
-			   "acpi",
-			   acpi_facp)) {
-		printk(KERN_ERR "ACPI: SCI (IRQ%d) allocation failed\n",
-		       acpi_facp->sci_int);
-		acpi_destroy_tables();
-		return -ENODEV;
-	}
-
-	acpi_claim_ioports(acpi_facp);
-	acpi_sysctl = register_sysctl_table(acpi_dir_table, 1);
-
-	pid = kernel_thread(acpi_control_thread,
-			    NULL,
-			    CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
-
-	acpi_power_off = acpi_power_off_handler;
-
-	/*
-	 * Set up the ACPI idle function. Note that we can't really
-	 * do this with multiple CPU's, we'd need a per-CPU ACPI
-	 * device..
-	 */
-#ifdef __SMP__
-	if (smp_num_cpus > 1)
-		return 0;
-#endif
-
-	acpi_idle = acpi_idle_handler;
-
-	return 0;
-}
-
-/*
- * Disable and deinitialize ACPI
- */
-static void __exit acpi_exit(void)
-{
-	acpi_idle = NULL;
-	acpi_power_off = NULL;
-
-	unregister_sysctl_table(acpi_sysctl);
-	acpi_disable(acpi_facp);
-	acpi_release_ioports(acpi_facp);
-
-	if (acpi_facp->sci_int)
-		free_irq(acpi_facp->sci_int, acpi_facp);
-
-	acpi_destroy_tables();
-}
-
-/*
- * Register a device with the ACPI subsystem
- */
-struct acpi_dev* acpi_register(struct acpi_dev_info *info, unsigned long adr)
-{
-	struct acpi_dev *dev = NULL;
-	if (info) {
-		dev = kmalloc(sizeof(struct acpi_dev), GFP_KERNEL);
-		if (dev) {
-			unsigned long flags;
-			
-			memset(dev, 0, sizeof(*dev));
-			memcpy(&dev->info, info, sizeof(dev->info));
-			dev->adr = adr;
-			
-			spin_lock_irqsave(&acpi_devs_lock, flags);
-			list_add(&dev->entry, &acpi_devs);
-			spin_unlock_irqrestore(&acpi_devs_lock, flags);
-		}
-	}
-	return dev;
-}
-
-/*
- * Unregister a device with ACPI
- */
-void acpi_unregister(struct acpi_dev *dev)
-{
-	if (dev) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&acpi_devs_lock, flags);
-		list_del(&dev->entry);
-		spin_unlock_irqrestore(&acpi_devs_lock, flags);
-
-		kfree(dev);
-	}
-}
-
-/*
- * Wake up a device
- */
-void acpi_wakeup(struct acpi_dev *dev)
-{
-	// run _PS0 or tell parent bus to wake device up
-}
-
-/*
- * Manage idle devices
- */
-static int acpi_control_thread(void *context)
-{
-	exit_mm(current);
-	exit_files(current);
-	strcpy(current->comm, "acpi");
-	
-	for(;;) {
-		interruptible_sleep_on(&acpi_control_wait);
-		if (signal_pending(current))
-			break;
-
-		// find all idle devices and set idle timer
-	}
-
-	return 0;
-}
-
-__initcall(acpi_init);
-
-/*
- * Module visible symbols
- */
-EXPORT_SYMBOL(acpi_control_wait);
-EXPORT_SYMBOL(acpi_register);
-EXPORT_SYMBOL(acpi_unregister);
-EXPORT_SYMBOL(acpi_wakeup);