ec.c 39.3 KB
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/*
 *  acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
 *
 *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/actypes.h>

#define _COMPONENT		ACPI_EC_COMPONENT
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ACPI_MODULE_NAME("acpi_ec")
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#define ACPI_EC_COMPONENT		0x00100000
#define ACPI_EC_CLASS			"embedded_controller"
#define ACPI_EC_HID			"PNP0C09"
#define ACPI_EC_DRIVER_NAME		"ACPI Embedded Controller Driver"
#define ACPI_EC_DEVICE_NAME		"Embedded Controller"
#define ACPI_EC_FILE_INFO		"info"
#define ACPI_EC_FLAG_OBF	0x01	/* Output buffer full */
#define ACPI_EC_FLAG_IBF	0x02	/* Input buffer full */
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#define ACPI_EC_FLAG_BURST	0x10	/* burst mode */
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#define ACPI_EC_FLAG_SCI	0x20	/* EC-SCI occurred */
#define ACPI_EC_EVENT_OBF	0x01	/* Output buffer full */
#define ACPI_EC_EVENT_IBE	0x02	/* Input buffer empty */
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#define ACPI_EC_DELAY		50	/* Wait 50ms max. during EC ops */
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#define ACPI_EC_UDELAY_GLK	1000	/* Wait 1ms max. to get global lock */
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#define ACPI_EC_UDELAY         100	/* Poll @ 100us increments */
#define ACPI_EC_UDELAY_COUNT   1000	/* Wait 10ms max. during EC ops */
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#define ACPI_EC_COMMAND_READ	0x80
#define ACPI_EC_COMMAND_WRITE	0x81
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#define ACPI_EC_BURST_ENABLE	0x82
#define ACPI_EC_BURST_DISABLE	0x83
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#define ACPI_EC_COMMAND_QUERY	0x84
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#define EC_POLL			0xFF
#define EC_INTR			0x00
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static int acpi_ec_remove(struct acpi_device *device, int type);
static int acpi_ec_start(struct acpi_device *device);
static int acpi_ec_stop(struct acpi_device *device, int type);
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static int acpi_ec_intr_add(struct acpi_device *device);
static int acpi_ec_poll_add(struct acpi_device *device);
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static struct acpi_driver acpi_ec_driver = {
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	.name = ACPI_EC_DRIVER_NAME,
	.class = ACPI_EC_CLASS,
	.ids = ACPI_EC_HID,
	.ops = {
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		.add = acpi_ec_intr_add,
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		.remove = acpi_ec_remove,
		.start = acpi_ec_start,
		.stop = acpi_ec_stop,
		},
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};
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union acpi_ec {
	struct {
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		u32 mode;
		acpi_handle handle;
		unsigned long uid;
		unsigned long gpe_bit;
		struct acpi_generic_address status_addr;
		struct acpi_generic_address command_addr;
		struct acpi_generic_address data_addr;
		unsigned long global_lock;
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	} common;

	struct {
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		u32 mode;
		acpi_handle handle;
		unsigned long uid;
		unsigned long gpe_bit;
		struct acpi_generic_address status_addr;
		struct acpi_generic_address command_addr;
		struct acpi_generic_address data_addr;
		unsigned long global_lock;
		unsigned int expect_event;
		atomic_t leaving_burst;	/* 0 : No, 1 : Yes, 2: abort */
		atomic_t pending_gpe;
		struct semaphore sem;
		wait_queue_head_t wait;
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	} intr;
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	struct {
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		u32 mode;
		acpi_handle handle;
		unsigned long uid;
		unsigned long gpe_bit;
		struct acpi_generic_address status_addr;
		struct acpi_generic_address command_addr;
		struct acpi_generic_address data_addr;
		unsigned long global_lock;
		spinlock_t lock;
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	} poll;
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};

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static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event);
static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event);
static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data);
static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data);
static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data);
static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data);
static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data);
static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data);
static void acpi_ec_gpe_poll_query(void *ec_cxt);
static void acpi_ec_gpe_intr_query(void *ec_cxt);
static u32 acpi_ec_gpe_poll_handler(void *data);
static u32 acpi_ec_gpe_intr_handler(void *data);
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static acpi_status __init
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acpi_fake_ecdt_poll_callback(acpi_handle handle,
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				u32 Level, void *context, void **retval);
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static acpi_status __init
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acpi_fake_ecdt_intr_callback(acpi_handle handle,
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			      u32 Level, void *context, void **retval);

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static int __init acpi_ec_poll_get_real_ecdt(void);
static int __init acpi_ec_intr_get_real_ecdt(void);
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/* If we find an EC via the ECDT, we need to keep a ptr to its context */
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static union acpi_ec *ec_ecdt;
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/* External interfaces use first EC only, so remember */
static struct acpi_device *first_ec;
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static int acpi_ec_poll_mode = EC_INTR;
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/* --------------------------------------------------------------------------
                             Transaction Management
   -------------------------------------------------------------------------- */

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static u32 acpi_ec_read_status(union acpi_ec *ec)
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{
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	u32 status = 0;
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	acpi_hw_low_level_read(8, &status, &ec->common.status_addr);
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	return status;
}

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static int acpi_ec_wait(union acpi_ec *ec, u8 event)
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{
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	if (acpi_ec_poll_mode)
		return acpi_ec_poll_wait(ec, event);
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	else
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		return acpi_ec_intr_wait(ec, event);
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}

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static int acpi_ec_poll_wait(union acpi_ec *ec, u8 event)
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{
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	u32 acpi_ec_status = 0;
	u32 i = ACPI_EC_UDELAY_COUNT;
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	if (!ec)
		return -EINVAL;

	/* Poll the EC status register waiting for the event to occur. */
	switch (event) {
	case ACPI_EC_EVENT_OBF:
		do {
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			acpi_hw_low_level_read(8, &acpi_ec_status,
					       &ec->common.status_addr);
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			if (acpi_ec_status & ACPI_EC_FLAG_OBF)
				return 0;
			udelay(ACPI_EC_UDELAY);
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		} while (--i > 0);
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		break;
	case ACPI_EC_EVENT_IBE:
		do {
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			acpi_hw_low_level_read(8, &acpi_ec_status,
					       &ec->common.status_addr);
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			if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
				return 0;
			udelay(ACPI_EC_UDELAY);
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		} while (--i > 0);
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		break;
	default:
		return -EINVAL;
	}

	return -ETIME;
}
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static int acpi_ec_intr_wait(union acpi_ec *ec, unsigned int event)
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{
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	int result = 0;
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	ACPI_FUNCTION_TRACE("acpi_ec_wait");
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	ec->intr.expect_event = event;
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	smp_mb();

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	switch (event) {
	case ACPI_EC_EVENT_IBE:
		if (~acpi_ec_read_status(ec) & event) {
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			ec->intr.expect_event = 0;
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			return_VALUE(0);
		}
		break;
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	default:
		break;
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	}

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	result = wait_event_timeout(ec->intr.wait,
				    !ec->intr.expect_event,
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				    msecs_to_jiffies(ACPI_EC_DELAY));

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	ec->intr.expect_event = 0;
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	smp_mb();

	/*
	 * Verify that the event in question has actually happened by
	 * querying EC status. Do the check even if operation timed-out
	 * to make sure that we did not miss interrupt.
	 */
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	switch (event) {
	case ACPI_EC_EVENT_OBF:
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		if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
			return_VALUE(0);
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		break;
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	case ACPI_EC_EVENT_IBE:
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		if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
			return_VALUE(0);
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		break;
	}

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	return_VALUE(-ETIME);
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}

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#ifdef ACPI_FUTURE_USAGE
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/*
 * Note: samsung nv5000 doesn't work with ec burst mode.
 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
 */
int acpi_ec_enter_burst_mode(union acpi_ec *ec)
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{
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	u32 tmp = 0;
	int status = 0;
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	ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");

	status = acpi_ec_read_status(ec);
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	if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
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		status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
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		if (status)
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			goto end;
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		acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE,
					&ec->common.command_addr);
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		status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
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		acpi_hw_low_level_read(8, &tmp, &ec->common.data_addr);
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		if (tmp != 0x90) {	/* Burst ACK byte */
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			return_VALUE(-EINVAL);
		}
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	}

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	atomic_set(&ec->intr.leaving_burst, 0);
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	return_VALUE(0);
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      end:
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	printk(KERN_WARNING PREFIX "Error in acpi_ec_wait\n");
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	return_VALUE(-1);
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}

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int acpi_ec_leave_burst_mode(union acpi_ec *ec)
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{
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	int status = 0;
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	ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");

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	status = acpi_ec_read_status(ec);
	if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
		status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
		if(status)
			goto end;
		acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->common.command_addr);
		acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
	} 
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	atomic_set(&ec->intr.leaving_burst, 1);
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	return_VALUE(0);
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end:
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	printk(KERN_WARNING PREFIX "leave burst_mode:error\n");
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	return_VALUE(-1);
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}
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#endif /* ACPI_FUTURE_USAGE */
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static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
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{
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	if (acpi_ec_poll_mode)
		return acpi_ec_poll_read(ec, address, data);
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	else
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		return acpi_ec_intr_read(ec, address, data);
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}
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static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
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{
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	if (acpi_ec_poll_mode)
		return acpi_ec_poll_write(ec, address, data);
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	else
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		return acpi_ec_intr_write(ec, address, data);
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}
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static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data)
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{
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	acpi_status status = AE_OK;
	int result = 0;
	unsigned long flags = 0;
	u32 glk = 0;
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	ACPI_FUNCTION_TRACE("acpi_ec_read");

	if (!ec || !data)
		return_VALUE(-EINVAL);

	*data = 0;

	if (ec->common.global_lock) {
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}

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	spin_lock_irqsave(&ec->poll.lock, flags);
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	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
				&ec->common.command_addr);
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	result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (result)
		goto end;

	acpi_hw_low_level_write(8, address, &ec->common.data_addr);
	result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
	if (result)
		goto end;

	acpi_hw_low_level_read(8, data, &ec->common.data_addr);

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
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			  *data, address));

      end:
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	spin_unlock_irqrestore(&ec->poll.lock, flags);
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	if (ec->common.global_lock)
		acpi_release_global_lock(glk);

	return_VALUE(result);
}

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static int acpi_ec_poll_write(union acpi_ec *ec, u8 address, u8 data)
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{
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	int result = 0;
	acpi_status status = AE_OK;
	unsigned long flags = 0;
	u32 glk = 0;
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	ACPI_FUNCTION_TRACE("acpi_ec_write");

	if (!ec)
		return_VALUE(-EINVAL);

	if (ec->common.global_lock) {
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}

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	spin_lock_irqsave(&ec->poll.lock, flags);
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	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
				&ec->common.command_addr);
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	result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (result)
		goto end;

	acpi_hw_low_level_write(8, address, &ec->common.data_addr);
	result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (result)
		goto end;

	acpi_hw_low_level_write(8, data, &ec->common.data_addr);
	result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (result)
		goto end;

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
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			  data, address));
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      end:
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	spin_unlock_irqrestore(&ec->poll.lock, flags);
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	if (ec->common.global_lock)
		acpi_release_global_lock(glk);

	return_VALUE(result);
}

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static int acpi_ec_intr_read(union acpi_ec *ec, u8 address, u32 * data)
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{
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	int status = 0;
	u32 glk;
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	ACPI_FUNCTION_TRACE("acpi_ec_read");

	if (!ec || !data)
		return_VALUE(-EINVAL);

	*data = 0;

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	if (ec->common.global_lock) {
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		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}
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	WARN_ON(in_interrupt());
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	down(&ec->intr.sem);
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	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (status) {
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		printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
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		goto end;
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	}
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	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ,
				&ec->common.command_addr);
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	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (status) {
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		printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
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	}
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	acpi_hw_low_level_write(8, address, &ec->common.data_addr);
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	status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
	if (status) {
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		printk(KERN_DEBUG PREFIX "read EC, OB not full\n");
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		goto end;
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	}
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	acpi_hw_low_level_read(8, data, &ec->common.data_addr);
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	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
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			  *data, address));

      end:
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	up(&ec->intr.sem);
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	if (ec->common.global_lock)
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		acpi_release_global_lock(glk);

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	return_VALUE(status);
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}

469
static int acpi_ec_intr_write(union acpi_ec *ec, u8 address, u8 data)
L
Linus Torvalds 已提交
470
{
L
Len Brown 已提交
471 472
	int status = 0;
	u32 glk;
L
Linus Torvalds 已提交
473 474 475 476 477

	ACPI_FUNCTION_TRACE("acpi_ec_write");

	if (!ec)
		return_VALUE(-EINVAL);
478

L
Luming Yu 已提交
479
	if (ec->common.global_lock) {
L
Linus Torvalds 已提交
480 481 482 483 484
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}

D
Dmitry Torokhov 已提交
485
	WARN_ON(in_interrupt());
486
	down(&ec->intr.sem);
D
Dmitry Torokhov 已提交
487

488
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
L
Len Brown 已提交
489
	if (status) {
490
		printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
D
Dmitry Torokhov 已提交
491
	}
L
Len Brown 已提交
492 493
	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE,
				&ec->common.command_addr);
D
Dmitry Torokhov 已提交
494
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
495
	if (status) {
496
		printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
D
Dmitry Torokhov 已提交
497
	}
L
Linus Torvalds 已提交
498

L
Luming Yu 已提交
499
	acpi_hw_low_level_write(8, address, &ec->common.data_addr);
D
Dmitry Torokhov 已提交
500
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
L
Len Brown 已提交
501
	if (status) {
502
		printk(KERN_DEBUG PREFIX "write EC, IB not empty\n");
D
Dmitry Torokhov 已提交
503
	}
L
Linus Torvalds 已提交
504

L
Luming Yu 已提交
505
	acpi_hw_low_level_write(8, data, &ec->common.data_addr);
L
Linus Torvalds 已提交
506 507

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
L
Len Brown 已提交
508
			  data, address));
L
Linus Torvalds 已提交
509

510
	up(&ec->intr.sem);
L
Linus Torvalds 已提交
511

L
Luming Yu 已提交
512
	if (ec->common.global_lock)
L
Linus Torvalds 已提交
513 514
		acpi_release_global_lock(glk);

D
Dmitry Torokhov 已提交
515
	return_VALUE(status);
L
Linus Torvalds 已提交
516 517 518 519 520
}

/*
 * Externally callable EC access functions. For now, assume 1 EC only
 */
L
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521
int ec_read(u8 addr, u8 * val)
L
Linus Torvalds 已提交
522
{
L
Luming Yu 已提交
523
	union acpi_ec *ec;
L
Linus Torvalds 已提交
524 525 526 527 528 529 530 531 532 533 534 535 536
	int err;
	u32 temp_data;

	if (!first_ec)
		return -ENODEV;

	ec = acpi_driver_data(first_ec);

	err = acpi_ec_read(ec, addr, &temp_data);

	if (!err) {
		*val = temp_data;
		return 0;
L
Len Brown 已提交
537
	} else
L
Linus Torvalds 已提交
538 539
		return err;
}
L
Len Brown 已提交
540

L
Linus Torvalds 已提交
541 542
EXPORT_SYMBOL(ec_read);

L
Len Brown 已提交
543
int ec_write(u8 addr, u8 val)
L
Linus Torvalds 已提交
544
{
L
Luming Yu 已提交
545
	union acpi_ec *ec;
L
Linus Torvalds 已提交
546 547 548 549 550 551 552 553 554 555 556
	int err;

	if (!first_ec)
		return -ENODEV;

	ec = acpi_driver_data(first_ec);

	err = acpi_ec_write(ec, addr, val);

	return err;
}
L
Len Brown 已提交
557

L
Linus Torvalds 已提交
558 559
EXPORT_SYMBOL(ec_write);

L
Len Brown 已提交
560
static int acpi_ec_query(union acpi_ec *ec, u32 * data)
L
Luming Yu 已提交
561
{
562 563
	if (acpi_ec_poll_mode)
		return acpi_ec_poll_query(ec, data);
L
Luming Yu 已提交
564
	else
565
		return acpi_ec_intr_query(ec, data);
L
Luming Yu 已提交
566
}
567
static int acpi_ec_poll_query(union acpi_ec *ec, u32 * data)
L
Luming Yu 已提交
568
{
L
Len Brown 已提交
569 570 571 572
	int result = 0;
	acpi_status status = AE_OK;
	unsigned long flags = 0;
	u32 glk = 0;
L
Luming Yu 已提交
573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591

	ACPI_FUNCTION_TRACE("acpi_ec_query");

	if (!ec || !data)
		return_VALUE(-EINVAL);

	*data = 0;

	if (ec->common.global_lock) {
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}

	/*
	 * Query the EC to find out which _Qxx method we need to evaluate.
	 * Note that successful completion of the query causes the ACPI_EC_SCI
	 * bit to be cleared (and thus clearing the interrupt source).
	 */
592
	spin_lock_irqsave(&ec->poll.lock, flags);
L
Luming Yu 已提交
593

L
Len Brown 已提交
594 595
	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
				&ec->common.command_addr);
L
Luming Yu 已提交
596 597 598 599 600 601 602 603
	result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
	if (result)
		goto end;

	acpi_hw_low_level_read(8, data, &ec->common.data_addr);
	if (!*data)
		result = -ENODATA;

L
Len Brown 已提交
604
      end:
605
	spin_unlock_irqrestore(&ec->poll.lock, flags);
L
Luming Yu 已提交
606 607 608 609 610 611

	if (ec->common.global_lock)
		acpi_release_global_lock(glk);

	return_VALUE(result);
}
612
static int acpi_ec_intr_query(union acpi_ec *ec, u32 * data)
L
Linus Torvalds 已提交
613
{
L
Len Brown 已提交
614 615
	int status = 0;
	u32 glk;
L
Linus Torvalds 已提交
616 617 618 619 620 621 622

	ACPI_FUNCTION_TRACE("acpi_ec_query");

	if (!ec || !data)
		return_VALUE(-EINVAL);
	*data = 0;

L
Luming Yu 已提交
623
	if (ec->common.global_lock) {
L
Linus Torvalds 已提交
624 625 626 627 628
		status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
		if (ACPI_FAILURE(status))
			return_VALUE(-ENODEV);
	}

629
	down(&ec->intr.sem);
630 631 632

	status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
	if (status) {
633
		printk(KERN_DEBUG PREFIX "query EC, IB not empty\n");
D
Dmitry Torokhov 已提交
634
		goto end;
635
	}
L
Linus Torvalds 已提交
636 637 638 639 640
	/*
	 * Query the EC to find out which _Qxx method we need to evaluate.
	 * Note that successful completion of the query causes the ACPI_EC_SCI
	 * bit to be cleared (and thus clearing the interrupt source).
	 */
L
Len Brown 已提交
641 642
	acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY,
				&ec->common.command_addr);
D
Dmitry Torokhov 已提交
643
	status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
L
Len Brown 已提交
644
	if (status) {
645
		printk(KERN_DEBUG PREFIX "query EC, OB not full\n");
L
Linus Torvalds 已提交
646
		goto end;
D
Dmitry Torokhov 已提交
647 648
	}

L
Luming Yu 已提交
649
	acpi_hw_low_level_read(8, data, &ec->common.data_addr);
L
Linus Torvalds 已提交
650
	if (!*data)
D
Dmitry Torokhov 已提交
651
		status = -ENODATA;
L
Linus Torvalds 已提交
652

L
Len Brown 已提交
653
      end:
654
	up(&ec->intr.sem);
L
Linus Torvalds 已提交
655

L
Luming Yu 已提交
656
	if (ec->common.global_lock)
L
Linus Torvalds 已提交
657 658
		acpi_release_global_lock(glk);

D
Dmitry Torokhov 已提交
659
	return_VALUE(status);
L
Linus Torvalds 已提交
660 661 662 663 664 665
}

/* --------------------------------------------------------------------------
                                Event Management
   -------------------------------------------------------------------------- */

L
Luming Yu 已提交
666
union acpi_ec_query_data {
L
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667 668
	acpi_handle handle;
	u8 data;
L
Linus Torvalds 已提交
669 670
};

L
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671
static void acpi_ec_gpe_query(void *ec_cxt)
L
Linus Torvalds 已提交
672
{
673 674
	if (acpi_ec_poll_mode)
		acpi_ec_gpe_poll_query(ec_cxt);
L
Luming Yu 已提交
675
	else
676
		acpi_ec_gpe_intr_query(ec_cxt);
L
Luming Yu 已提交
677 678
}

679
static void acpi_ec_gpe_poll_query(void *ec_cxt)
L
Luming Yu 已提交
680
{
L
Len Brown 已提交
681 682 683 684 685 686 687
	union acpi_ec *ec = (union acpi_ec *)ec_cxt;
	u32 value = 0;
	unsigned long flags = 0;
	static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
	const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
		'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
	};
L
Luming Yu 已提交
688 689 690 691 692 693

	ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");

	if (!ec_cxt)
		goto end;

694
	spin_lock_irqsave(&ec->poll.lock, flags);
L
Luming Yu 已提交
695
	acpi_hw_low_level_read(8, &value, &ec->common.command_addr);
696
	spin_unlock_irqrestore(&ec->poll.lock, flags);
L
Luming Yu 已提交
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716

	/* TBD: Implement asynch events!
	 * NOTE: All we care about are EC-SCI's.  Other EC events are
	 * handled via polling (yuck!).  This is because some systems
	 * treat EC-SCIs as level (versus EDGE!) triggered, preventing
	 *  a purely interrupt-driven approach (grumble, grumble).
	 */
	if (!(value & ACPI_EC_FLAG_SCI))
		goto end;

	if (acpi_ec_query(ec, &value))
		goto end;

	object_name[2] = hex[((value >> 4) & 0x0F)];
	object_name[3] = hex[(value & 0x0F)];

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));

	acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);

L
Len Brown 已提交
717
      end:
L
Luming Yu 已提交
718 719
	acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
}
720
static void acpi_ec_gpe_intr_query(void *ec_cxt)
L
Luming Yu 已提交
721
{
L
Len Brown 已提交
722 723 724 725 726 727 728
	union acpi_ec *ec = (union acpi_ec *)ec_cxt;
	u32 value;
	int result = -ENODATA;
	static char object_name[5] = { '_', 'Q', '0', '0', '\0' };
	const char hex[] = { '0', '1', '2', '3', '4', '5', '6', '7',
		'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
	};
L
Linus Torvalds 已提交
729 730 731

	ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");

D
Dmitry Torokhov 已提交
732 733
	if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
		result = acpi_ec_query(ec, &value);
L
Linus Torvalds 已提交
734

D
Dmitry Torokhov 已提交
735
	if (result)
L
Linus Torvalds 已提交
736 737 738 739 740 741 742
		goto end;

	object_name[2] = hex[((value >> 4) & 0x0F)];
	object_name[3] = hex[(value & 0x0F)];

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));

L
Luming Yu 已提交
743
	acpi_evaluate_object(ec->common.handle, object_name, NULL, NULL);
L
Len Brown 已提交
744
      end:
745
	atomic_dec(&ec->intr.pending_gpe);
D
Dmitry Torokhov 已提交
746
	return;
L
Linus Torvalds 已提交
747 748
}

L
Len Brown 已提交
749
static u32 acpi_ec_gpe_handler(void *data)
L
Luming Yu 已提交
750
{
751 752
	if (acpi_ec_poll_mode)
		return acpi_ec_gpe_poll_handler(data);
L
Luming Yu 已提交
753
	else
754
		return acpi_ec_gpe_intr_handler(data);
L
Luming Yu 已提交
755
}
756
static u32 acpi_ec_gpe_poll_handler(void *data)
L
Luming Yu 已提交
757
{
L
Len Brown 已提交
758 759
	acpi_status status = AE_OK;
	union acpi_ec *ec = (union acpi_ec *)data;
L
Luming Yu 已提交
760 761 762 763 764 765 766

	if (!ec)
		return ACPI_INTERRUPT_NOT_HANDLED;

	acpi_disable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);

	status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
L
Len Brown 已提交
767
					     acpi_ec_gpe_query, ec);
L
Luming Yu 已提交
768 769 770 771 772 773

	if (status == AE_OK)
		return ACPI_INTERRUPT_HANDLED;
	else
		return ACPI_INTERRUPT_NOT_HANDLED;
}
774
static u32 acpi_ec_gpe_intr_handler(void *data)
L
Linus Torvalds 已提交
775
{
L
Len Brown 已提交
776 777 778
	acpi_status status = AE_OK;
	u32 value;
	union acpi_ec *ec = (union acpi_ec *)data;
L
Linus Torvalds 已提交
779 780 781 782

	if (!ec)
		return ACPI_INTERRUPT_NOT_HANDLED;

783
	acpi_clear_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
D
Dmitry Torokhov 已提交
784
	value = acpi_ec_read_status(ec);
L
Linus Torvalds 已提交
785

786
	switch (ec->intr.expect_event) {
787 788 789 790 791 792
	case ACPI_EC_EVENT_OBF:
		if (!(value & ACPI_EC_FLAG_OBF))
			break;
	case ACPI_EC_EVENT_IBE:
		if ((value & ACPI_EC_FLAG_IBF))
			break;
793 794
		ec->intr.expect_event = 0;
		wake_up(&ec->intr.wait);
795 796 797
		return ACPI_INTERRUPT_HANDLED;
	default:
		break;
D
Dmitry Torokhov 已提交
798 799
	}

L
Len Brown 已提交
800
	if (value & ACPI_EC_FLAG_SCI) {
801
		atomic_add(1, &ec->intr.pending_gpe);
D
Dmitry Torokhov 已提交
802
		status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
L
Len Brown 已提交
803
						     acpi_ec_gpe_query, ec);
L
Luming Yu 已提交
804
		return status == AE_OK ?
L
Len Brown 已提交
805 806
		    ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
	}
L
Luming Yu 已提交
807
	acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_ISR);
D
Dmitry Torokhov 已提交
808
	return status == AE_OK ?
L
Len Brown 已提交
809
	    ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
L
Linus Torvalds 已提交
810 811 812 813 814 815 816
}

/* --------------------------------------------------------------------------
                             Address Space Management
   -------------------------------------------------------------------------- */

static acpi_status
L
Len Brown 已提交
817 818
acpi_ec_space_setup(acpi_handle region_handle,
		    u32 function, void *handler_context, void **return_context)
L
Linus Torvalds 已提交
819 820 821 822 823
{
	/*
	 * The EC object is in the handler context and is needed
	 * when calling the acpi_ec_space_handler.
	 */
L
Len Brown 已提交
824 825
	*return_context = (function != ACPI_REGION_DEACTIVATE) ?
	    handler_context : NULL;
L
Linus Torvalds 已提交
826 827 828 829 830

	return AE_OK;
}

static acpi_status
L
Len Brown 已提交
831 832 833 834 835
acpi_ec_space_handler(u32 function,
		      acpi_physical_address address,
		      u32 bit_width,
		      acpi_integer * value,
		      void *handler_context, void *region_context)
L
Linus Torvalds 已提交
836
{
L
Len Brown 已提交
837 838 839 840 841
	int result = 0;
	union acpi_ec *ec = NULL;
	u64 temp = *value;
	acpi_integer f_v = 0;
	int i = 0;
L
Linus Torvalds 已提交
842 843 844 845 846 847

	ACPI_FUNCTION_TRACE("acpi_ec_space_handler");

	if ((address > 0xFF) || !value || !handler_context)
		return_VALUE(AE_BAD_PARAMETER);

L
Luming Yu 已提交
848
	if (bit_width != 8 && acpi_strict) {
L
Len Brown 已提交
849 850
		printk(KERN_WARNING PREFIX
		       "acpi_ec_space_handler: bit_width should be 8\n");
L
Luming Yu 已提交
851
		return_VALUE(AE_BAD_PARAMETER);
L
Linus Torvalds 已提交
852 853
	}

L
Len Brown 已提交
854
	ec = (union acpi_ec *)handler_context;
L
Linus Torvalds 已提交
855

L
Len Brown 已提交
856
      next_byte:
L
Linus Torvalds 已提交
857 858
	switch (function) {
	case ACPI_READ:
L
Luming Yu 已提交
859
		temp = 0;
L
Len Brown 已提交
860
		result = acpi_ec_read(ec, (u8) address, (u32 *) & temp);
L
Linus Torvalds 已提交
861 862
		break;
	case ACPI_WRITE:
L
Luming Yu 已提交
863
		result = acpi_ec_write(ec, (u8) address, (u8) temp);
L
Linus Torvalds 已提交
864 865 866 867 868 869 870 871
		break;
	default:
		result = -EINVAL;
		goto out;
		break;
	}

	bit_width -= 8;
L
Luming Yu 已提交
872 873 874 875 876
	if (bit_width) {
		if (function == ACPI_READ)
			f_v |= temp << 8 * i;
		if (function == ACPI_WRITE)
			temp >>= 8;
L
Linus Torvalds 已提交
877
		i++;
A
Andrew Morton 已提交
878
		address++;
L
Linus Torvalds 已提交
879 880 881
		goto next_byte;
	}

L
Luming Yu 已提交
882 883
	if (function == ACPI_READ) {
		f_v |= temp << 8 * i;
L
Linus Torvalds 已提交
884 885 886
		*value = f_v;
	}

L
Len Brown 已提交
887
      out:
L
Linus Torvalds 已提交
888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906
	switch (result) {
	case -EINVAL:
		return_VALUE(AE_BAD_PARAMETER);
		break;
	case -ENODEV:
		return_VALUE(AE_NOT_FOUND);
		break;
	case -ETIME:
		return_VALUE(AE_TIME);
		break;
	default:
		return_VALUE(AE_OK);
	}
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
907
static struct proc_dir_entry *acpi_ec_dir;
L
Linus Torvalds 已提交
908

L
Len Brown 已提交
909
static int acpi_ec_read_info(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
910
{
L
Len Brown 已提交
911
	union acpi_ec *ec = (union acpi_ec *)seq->private;
L
Linus Torvalds 已提交
912 913 914 915 916 917 918

	ACPI_FUNCTION_TRACE("acpi_ec_read_info");

	if (!ec)
		goto end;

	seq_printf(seq, "gpe bit:                 0x%02x\n",
L
Len Brown 已提交
919
		   (u32) ec->common.gpe_bit);
L
Linus Torvalds 已提交
920
	seq_printf(seq, "ports:                   0x%02x, 0x%02x\n",
L
Len Brown 已提交
921 922
		   (u32) ec->common.status_addr.address,
		   (u32) ec->common.data_addr.address);
L
Linus Torvalds 已提交
923
	seq_printf(seq, "use global lock:         %s\n",
L
Len Brown 已提交
924
		   ec->common.global_lock ? "yes" : "no");
L
Luming Yu 已提交
925
	acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
L
Linus Torvalds 已提交
926

L
Len Brown 已提交
927
      end:
L
Linus Torvalds 已提交
928 929 930 931 932 933 934 935 936
	return_VALUE(0);
}

static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_ec_read_info, PDE(inode)->data);
}

static struct file_operations acpi_ec_info_ops = {
L
Len Brown 已提交
937 938 939 940
	.open = acpi_ec_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
L
Linus Torvalds 已提交
941 942 943
	.owner = THIS_MODULE,
};

L
Len Brown 已提交
944
static int acpi_ec_add_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
945
{
L
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946
	struct proc_dir_entry *entry = NULL;
L
Linus Torvalds 已提交
947 948 949 950 951

	ACPI_FUNCTION_TRACE("acpi_ec_add_fs");

	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
L
Len Brown 已提交
952
						     acpi_ec_dir);
L
Linus Torvalds 已提交
953 954 955 956 957
		if (!acpi_device_dir(device))
			return_VALUE(-ENODEV);
	}

	entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
L
Len Brown 已提交
958
				  acpi_device_dir(device));
L
Linus Torvalds 已提交
959 960
	if (!entry)
		ACPI_DEBUG_PRINT((ACPI_DB_WARN,
L
Len Brown 已提交
961 962
				  "Unable to create '%s' fs entry\n",
				  ACPI_EC_FILE_INFO));
L
Linus Torvalds 已提交
963 964 965 966 967 968 969 970 971
	else {
		entry->proc_fops = &acpi_ec_info_ops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	return_VALUE(0);
}

L
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972
static int acpi_ec_remove_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
{
	ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");

	if (acpi_device_dir(device)) {
		remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
		remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
		acpi_device_dir(device) = NULL;
	}

	return_VALUE(0);
}

/* --------------------------------------------------------------------------
                               Driver Interface
   -------------------------------------------------------------------------- */

989
static int acpi_ec_poll_add(struct acpi_device *device)
L
Linus Torvalds 已提交
990
{
L
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991 992 993 994
	int result = 0;
	acpi_status status = AE_OK;
	union acpi_ec *ec = NULL;
	unsigned long uid;
L
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995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007

	ACPI_FUNCTION_TRACE("acpi_ec_add");

	if (!device)
		return_VALUE(-EINVAL);

	ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
	if (!ec)
		return_VALUE(-ENOMEM);
	memset(ec, 0, sizeof(union acpi_ec));

	ec->common.handle = device->handle;
	ec->common.uid = -1;
1008
	spin_lock_init(&ec->poll.lock);
L
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1009 1010 1011 1012 1013
	strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_EC_CLASS);
	acpi_driver_data(device) = ec;

	/* Use the global lock for all EC transactions? */
L
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1014 1015
	acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
			      &ec->common.global_lock);
L
Luming Yu 已提交
1016 1017

	/* If our UID matches the UID for the ECDT-enumerated EC,
L
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1018
	   we now have the *real* EC info, so kill the makeshift one. */
L
Luming Yu 已提交
1019 1020 1021
	acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
	if (ec_ecdt && ec_ecdt->common.uid == uid) {
		acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
L
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1022 1023 1024 1025 1026
						  ACPI_ADR_SPACE_EC,
						  &acpi_ec_space_handler);

		acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
					&acpi_ec_gpe_handler);
L
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1027 1028 1029 1030 1031 1032

		kfree(ec_ecdt);
	}

	/* Get GPE bit assignment (EC events). */
	/* TODO: Add support for _GPE returning a package */
L
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1033 1034 1035
	status =
	    acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
				  &ec->common.gpe_bit);
L
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1036 1037
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
L
Len Brown 已提交
1038
				  "Error obtaining GPE bit assignment\n"));
L
Luming Yu 已提交
1039 1040 1041 1042 1043 1044 1045 1046
		result = -ENODEV;
		goto end;
	}

	result = acpi_ec_add_fs(device);
	if (result)
		goto end;

1047
	printk(KERN_INFO PREFIX "%s [%s] (gpe %d) polling mode.\n",
L
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1048 1049
	       acpi_device_name(device), acpi_device_bid(device),
	       (u32) ec->common.gpe_bit);
L
Luming Yu 已提交
1050 1051 1052 1053

	if (!first_ec)
		first_ec = device;

L
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1054
      end:
L
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1055 1056 1057 1058 1059
	if (result)
		kfree(ec);

	return_VALUE(result);
}
1060
static int acpi_ec_intr_add(struct acpi_device *device)
L
Luming Yu 已提交
1061
{
L
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1062 1063 1064 1065
	int result = 0;
	acpi_status status = AE_OK;
	union acpi_ec *ec = NULL;
	unsigned long uid;
L
Linus Torvalds 已提交
1066 1067 1068 1069 1070 1071

	ACPI_FUNCTION_TRACE("acpi_ec_add");

	if (!device)
		return_VALUE(-EINVAL);

L
Luming Yu 已提交
1072
	ec = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
L
Linus Torvalds 已提交
1073 1074
	if (!ec)
		return_VALUE(-ENOMEM);
L
Luming Yu 已提交
1075 1076 1077 1078
	memset(ec, 0, sizeof(union acpi_ec));

	ec->common.handle = device->handle;
	ec->common.uid = -1;
1079 1080 1081 1082
	atomic_set(&ec->intr.pending_gpe, 0);
	atomic_set(&ec->intr.leaving_burst, 1);
	init_MUTEX(&ec->intr.sem);
	init_waitqueue_head(&ec->intr.wait);
L
Linus Torvalds 已提交
1083 1084 1085 1086 1087
	strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_EC_CLASS);
	acpi_driver_data(device) = ec;

	/* Use the global lock for all EC transactions? */
L
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1088 1089
	acpi_evaluate_integer(ec->common.handle, "_GLK", NULL,
			      &ec->common.global_lock);
L
Linus Torvalds 已提交
1090 1091

	/* If our UID matches the UID for the ECDT-enumerated EC,
L
Len Brown 已提交
1092
	   we now have the *real* EC info, so kill the makeshift one. */
L
Luming Yu 已提交
1093 1094
	acpi_evaluate_integer(ec->common.handle, "_UID", NULL, &uid);
	if (ec_ecdt && ec_ecdt->common.uid == uid) {
L
Linus Torvalds 已提交
1095
		acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
L
Len Brown 已提交
1096 1097
						  ACPI_ADR_SPACE_EC,
						  &acpi_ec_space_handler);
D
Dmitry Torokhov 已提交
1098

L
Len Brown 已提交
1099 1100
		acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
					&acpi_ec_gpe_handler);
L
Linus Torvalds 已提交
1101 1102 1103 1104 1105 1106

		kfree(ec_ecdt);
	}

	/* Get GPE bit assignment (EC events). */
	/* TODO: Add support for _GPE returning a package */
L
Len Brown 已提交
1107 1108 1109
	status =
	    acpi_evaluate_integer(ec->common.handle, "_GPE", NULL,
				  &ec->common.gpe_bit);
L
Linus Torvalds 已提交
1110 1111
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
L
Len Brown 已提交
1112
				  "Error obtaining GPE bit assignment\n"));
L
Linus Torvalds 已提交
1113 1114 1115 1116 1117 1118 1119 1120
		result = -ENODEV;
		goto end;
	}

	result = acpi_ec_add_fs(device);
	if (result)
		goto end;

1121
	printk(KERN_INFO PREFIX "%s [%s] (gpe %d) interrupt mode.\n",
L
Len Brown 已提交
1122 1123
	       acpi_device_name(device), acpi_device_bid(device),
	       (u32) ec->common.gpe_bit);
L
Linus Torvalds 已提交
1124 1125 1126 1127

	if (!first_ec)
		first_ec = device;

L
Len Brown 已提交
1128
      end:
L
Linus Torvalds 已提交
1129 1130 1131 1132 1133 1134
	if (result)
		kfree(ec);

	return_VALUE(result);
}

L
Len Brown 已提交
1135
static int acpi_ec_remove(struct acpi_device *device, int type)
L
Linus Torvalds 已提交
1136
{
L
Len Brown 已提交
1137
	union acpi_ec *ec = NULL;
L
Linus Torvalds 已提交
1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153

	ACPI_FUNCTION_TRACE("acpi_ec_remove");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	acpi_ec_remove_fs(device);

	kfree(ec);

	return_VALUE(0);
}

static acpi_status
L
Len Brown 已提交
1154
acpi_ec_io_ports(struct acpi_resource *resource, void *context)
L
Linus Torvalds 已提交
1155
{
L
Len Brown 已提交
1156
	union acpi_ec *ec = (union acpi_ec *)context;
L
Linus Torvalds 已提交
1157 1158
	struct acpi_generic_address *addr;

B
Bob Moore 已提交
1159
	if (resource->type != ACPI_RESOURCE_TYPE_IO) {
L
Linus Torvalds 已提交
1160 1161 1162 1163 1164 1165 1166 1167
		return AE_OK;
	}

	/*
	 * The first address region returned is the data port, and
	 * the second address region returned is the status/command
	 * port.
	 */
L
Luming Yu 已提交
1168 1169 1170 1171
	if (ec->common.data_addr.register_bit_width == 0) {
		addr = &ec->common.data_addr;
	} else if (ec->common.command_addr.register_bit_width == 0) {
		addr = &ec->common.command_addr;
L
Linus Torvalds 已提交
1172 1173 1174 1175 1176 1177 1178
	} else {
		return AE_CTRL_TERMINATE;
	}

	addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
	addr->register_bit_width = 8;
	addr->register_bit_offset = 0;
B
Bob Moore 已提交
1179
	addr->address = resource->data.io.minimum;
L
Linus Torvalds 已提交
1180 1181 1182 1183

	return AE_OK;
}

L
Len Brown 已提交
1184
static int acpi_ec_start(struct acpi_device *device)
L
Linus Torvalds 已提交
1185
{
L
Len Brown 已提交
1186 1187
	acpi_status status = AE_OK;
	union acpi_ec *ec = NULL;
L
Linus Torvalds 已提交
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201

	ACPI_FUNCTION_TRACE("acpi_ec_start");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

	if (!ec)
		return_VALUE(-EINVAL);

	/*
	 * Get I/O port addresses. Convert to GAS format.
	 */
L
Luming Yu 已提交
1202
	status = acpi_walk_resources(ec->common.handle, METHOD_NAME__CRS,
L
Len Brown 已提交
1203 1204 1205 1206 1207
				     acpi_ec_io_ports, ec);
	if (ACPI_FAILURE(status)
	    || ec->common.command_addr.register_bit_width == 0) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Error getting I/O port addresses"));
L
Linus Torvalds 已提交
1208 1209 1210
		return_VALUE(-ENODEV);
	}

L
Luming Yu 已提交
1211
	ec->common.status_addr = ec->common.command_addr;
L
Linus Torvalds 已提交
1212 1213

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
L
Len Brown 已提交
1214 1215 1216
			  (u32) ec->common.gpe_bit,
			  (u32) ec->common.command_addr.address,
			  (u32) ec->common.data_addr.address));
L
Linus Torvalds 已提交
1217 1218 1219 1220

	/*
	 * Install GPE handler
	 */
L
Luming Yu 已提交
1221
	status = acpi_install_gpe_handler(NULL, ec->common.gpe_bit,
L
Len Brown 已提交
1222 1223
					  ACPI_GPE_EDGE_TRIGGERED,
					  &acpi_ec_gpe_handler, ec);
L
Linus Torvalds 已提交
1224 1225 1226
	if (ACPI_FAILURE(status)) {
		return_VALUE(-ENODEV);
	}
L
Len Brown 已提交
1227 1228
	acpi_set_gpe_type(NULL, ec->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
	acpi_enable_gpe(NULL, ec->common.gpe_bit, ACPI_NOT_ISR);
L
Linus Torvalds 已提交
1229

L
Len Brown 已提交
1230 1231 1232 1233
	status = acpi_install_address_space_handler(ec->common.handle,
						    ACPI_ADR_SPACE_EC,
						    &acpi_ec_space_handler,
						    &acpi_ec_space_setup, ec);
L
Linus Torvalds 已提交
1234
	if (ACPI_FAILURE(status)) {
L
Len Brown 已提交
1235 1236
		acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
					&acpi_ec_gpe_handler);
L
Linus Torvalds 已提交
1237 1238 1239 1240 1241 1242
		return_VALUE(-ENODEV);
	}

	return_VALUE(AE_OK);
}

L
Len Brown 已提交
1243
static int acpi_ec_stop(struct acpi_device *device, int type)
L
Linus Torvalds 已提交
1244
{
L
Len Brown 已提交
1245 1246
	acpi_status status = AE_OK;
	union acpi_ec *ec = NULL;
L
Linus Torvalds 已提交
1247 1248 1249 1250 1251 1252 1253 1254

	ACPI_FUNCTION_TRACE("acpi_ec_stop");

	if (!device)
		return_VALUE(-EINVAL);

	ec = acpi_driver_data(device);

L
Luming Yu 已提交
1255
	status = acpi_remove_address_space_handler(ec->common.handle,
L
Len Brown 已提交
1256 1257
						   ACPI_ADR_SPACE_EC,
						   &acpi_ec_space_handler);
L
Linus Torvalds 已提交
1258 1259 1260
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

L
Len Brown 已提交
1261 1262 1263
	status =
	    acpi_remove_gpe_handler(NULL, ec->common.gpe_bit,
				    &acpi_ec_gpe_handler);
L
Linus Torvalds 已提交
1264 1265 1266 1267 1268 1269 1270
	if (ACPI_FAILURE(status))
		return_VALUE(-ENODEV);

	return_VALUE(0);
}

static acpi_status __init
L
Len Brown 已提交
1271 1272
acpi_fake_ecdt_callback(acpi_handle handle,
			u32 Level, void *context, void **retval)
L
Linus Torvalds 已提交
1273
{
L
Luming Yu 已提交
1274

1275 1276
	if (acpi_ec_poll_mode)
		return acpi_fake_ecdt_poll_callback(handle,
L
Len Brown 已提交
1277
						       Level, context, retval);
L
Luming Yu 已提交
1278
	else
1279
		return acpi_fake_ecdt_intr_callback(handle,
L
Len Brown 已提交
1280
						     Level, context, retval);
L
Luming Yu 已提交
1281 1282 1283
}

static acpi_status __init
1284
acpi_fake_ecdt_poll_callback(acpi_handle handle,
L
Len Brown 已提交
1285
				u32 Level, void *context, void **retval)
L
Luming Yu 已提交
1286
{
L
Len Brown 已提交
1287
	acpi_status status;
L
Luming Yu 已提交
1288 1289

	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
L
Len Brown 已提交
1290
				     acpi_ec_io_ports, ec_ecdt);
L
Luming Yu 已提交
1291 1292 1293 1294 1295 1296 1297
	if (ACPI_FAILURE(status))
		return status;
	ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;

	ec_ecdt->common.uid = -1;
	acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);

L
Len Brown 已提交
1298 1299 1300
	status =
	    acpi_evaluate_integer(handle, "_GPE", NULL,
				  &ec_ecdt->common.gpe_bit);
L
Luming Yu 已提交
1301 1302
	if (ACPI_FAILURE(status))
		return status;
1303
	spin_lock_init(&ec_ecdt->poll.lock);
L
Luming Yu 已提交
1304 1305 1306
	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.handle = handle;

L
Len Brown 已提交
1307 1308 1309 1310
	printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
	       (u32) ec_ecdt->common.gpe_bit,
	       (u32) ec_ecdt->common.command_addr.address,
	       (u32) ec_ecdt->common.data_addr.address);
L
Luming Yu 已提交
1311 1312 1313 1314 1315

	return AE_CTRL_TERMINATE;
}

static acpi_status __init
1316
acpi_fake_ecdt_intr_callback(acpi_handle handle,
L
Len Brown 已提交
1317
			      u32 Level, void *context, void **retval)
L
Luming Yu 已提交
1318
{
L
Len Brown 已提交
1319
	acpi_status status;
L
Linus Torvalds 已提交
1320

1321 1322
	init_MUTEX(&ec_ecdt->intr.sem);
	init_waitqueue_head(&ec_ecdt->intr.wait);
L
Linus Torvalds 已提交
1323
	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
L
Len Brown 已提交
1324
				     acpi_ec_io_ports, ec_ecdt);
L
Linus Torvalds 已提交
1325 1326
	if (ACPI_FAILURE(status))
		return status;
L
Luming Yu 已提交
1327
	ec_ecdt->common.status_addr = ec_ecdt->common.command_addr;
L
Linus Torvalds 已提交
1328

L
Luming Yu 已提交
1329 1330
	ec_ecdt->common.uid = -1;
	acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->common.uid);
L
Linus Torvalds 已提交
1331

L
Len Brown 已提交
1332 1333 1334
	status =
	    acpi_evaluate_integer(handle, "_GPE", NULL,
				  &ec_ecdt->common.gpe_bit);
L
Linus Torvalds 已提交
1335 1336
	if (ACPI_FAILURE(status))
		return status;
L
Luming Yu 已提交
1337 1338
	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.handle = handle;
L
Linus Torvalds 已提交
1339

L
Len Brown 已提交
1340 1341 1342 1343
	printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
	       (u32) ec_ecdt->common.gpe_bit,
	       (u32) ec_ecdt->common.command_addr.address,
	       (u32) ec_ecdt->common.data_addr.address);
L
Linus Torvalds 已提交
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357

	return AE_CTRL_TERMINATE;
}

/*
 * Some BIOS (such as some from Gateway laptops) access EC region very early
 * such as in BAT0._INI or EC._INI before an EC device is found and
 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
 * required, but if EC regison is accessed early, it is required.
 * The routine tries to workaround the BIOS bug by pre-scan EC device
 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
 * op region (since _REG isn't invoked yet). The assumption is true for
 * all systems found.
 */
L
Len Brown 已提交
1358
static int __init acpi_ec_fake_ecdt(void)
L
Linus Torvalds 已提交
1359
{
L
Len Brown 已提交
1360 1361
	acpi_status status;
	int ret = 0;
L
Linus Torvalds 已提交
1362 1363 1364

	printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");

L
Luming Yu 已提交
1365
	ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
L
Linus Torvalds 已提交
1366 1367 1368 1369
	if (!ec_ecdt) {
		ret = -ENOMEM;
		goto error;
	}
L
Luming Yu 已提交
1370
	memset(ec_ecdt, 0, sizeof(union acpi_ec));
L
Linus Torvalds 已提交
1371

L
Len Brown 已提交
1372 1373
	status = acpi_get_devices(ACPI_EC_HID,
				  acpi_fake_ecdt_callback, NULL, NULL);
L
Linus Torvalds 已提交
1374 1375 1376 1377 1378 1379 1380
	if (ACPI_FAILURE(status)) {
		kfree(ec_ecdt);
		ec_ecdt = NULL;
		ret = -ENODEV;
		goto error;
	}
	return 0;
L
Len Brown 已提交
1381
      error:
L
Linus Torvalds 已提交
1382 1383 1384 1385
	printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
	return ret;
}

L
Len Brown 已提交
1386
static int __init acpi_ec_get_real_ecdt(void)
L
Luming Yu 已提交
1387
{
1388 1389
	if (acpi_ec_poll_mode)
		return acpi_ec_poll_get_real_ecdt();
L
Luming Yu 已提交
1390
	else
1391
		return acpi_ec_intr_get_real_ecdt();
L
Luming Yu 已提交
1392 1393
}

1394
static int __init acpi_ec_poll_get_real_ecdt(void)
L
Luming Yu 已提交
1395
{
L
Len Brown 已提交
1396 1397
	acpi_status status;
	struct acpi_table_ecdt *ecdt_ptr;
L
Luming Yu 已提交
1398

L
Len Brown 已提交
1399 1400 1401
	status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
					 (struct acpi_table_header **)
					 &ecdt_ptr);
L
Luming Yu 已提交
1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
	if (ACPI_FAILURE(status))
		return -ENODEV;

	printk(KERN_INFO PREFIX "Found ECDT\n");

	/*
	 * Generate a temporary ec context to use until the namespace is scanned
	 */
	ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
	if (!ec_ecdt)
		return -ENOMEM;
	memset(ec_ecdt, 0, sizeof(union acpi_ec));

	ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
	ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
1419
	spin_lock_init(&ec_ecdt->poll.lock);
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	/* use the GL just to be safe */
	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.uid = ecdt_ptr->uid;

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	status =
	    acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
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	if (ACPI_FAILURE(status)) {
		goto error;
	}

	return 0;
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      error:
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	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}

1439
static int __init acpi_ec_intr_get_real_ecdt(void)
L
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1440
{
L
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	acpi_status status;
	struct acpi_table_ecdt *ecdt_ptr;
L
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1443

D
Dmitry Torokhov 已提交
1444
	status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
L
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1445 1446
					 (struct acpi_table_header **)
					 &ecdt_ptr);
L
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	if (ACPI_FAILURE(status))
		return -ENODEV;

	printk(KERN_INFO PREFIX "Found ECDT\n");

	/*
	 * Generate a temporary ec context to use until the namespace is scanned
	 */
L
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1455
	ec_ecdt = kmalloc(sizeof(union acpi_ec), GFP_KERNEL);
L
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	if (!ec_ecdt)
		return -ENOMEM;
L
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	memset(ec_ecdt, 0, sizeof(union acpi_ec));

1460 1461
	init_MUTEX(&ec_ecdt->intr.sem);
	init_waitqueue_head(&ec_ecdt->intr.wait);
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	ec_ecdt->common.command_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.status_addr = ecdt_ptr->ec_control;
	ec_ecdt->common.data_addr = ecdt_ptr->ec_data;
	ec_ecdt->common.gpe_bit = ecdt_ptr->gpe_bit;
L
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	/* use the GL just to be safe */
L
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	ec_ecdt->common.global_lock = TRUE;
	ec_ecdt->common.uid = ecdt_ptr->uid;
L
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1469

L
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	status =
	    acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->common.handle);
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	if (ACPI_FAILURE(status)) {
		goto error;
	}

	return 0;
L
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      error:
L
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	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}

static int __initdata acpi_fake_ecdt_enabled;
L
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1486
int __init acpi_ec_ecdt_probe(void)
L
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1487
{
L
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	acpi_status status;
	int ret;
L
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	ret = acpi_ec_get_real_ecdt();
	/* Try to make a fake ECDT */
	if (ret && acpi_fake_ecdt_enabled) {
		ret = acpi_ec_fake_ecdt();
	}

	if (ret)
		return 0;

	/*
	 * Install GPE handler
	 */
L
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1503
	status = acpi_install_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
L
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					  ACPI_GPE_EDGE_TRIGGERED,
					  &acpi_ec_gpe_handler, ec_ecdt);
L
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	if (ACPI_FAILURE(status)) {
		goto error;
	}
L
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1509 1510 1511 1512 1513 1514 1515 1516
	acpi_set_gpe_type(NULL, ec_ecdt->common.gpe_bit, ACPI_GPE_TYPE_RUNTIME);
	acpi_enable_gpe(NULL, ec_ecdt->common.gpe_bit, ACPI_NOT_ISR);

	status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
						    ACPI_ADR_SPACE_EC,
						    &acpi_ec_space_handler,
						    &acpi_ec_space_setup,
						    ec_ecdt);
L
Linus Torvalds 已提交
1517
	if (ACPI_FAILURE(status)) {
L
Luming Yu 已提交
1518
		acpi_remove_gpe_handler(NULL, ec_ecdt->common.gpe_bit,
L
Len Brown 已提交
1519
					&acpi_ec_gpe_handler);
L
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1520 1521 1522 1523 1524
		goto error;
	}

	return 0;

L
Len Brown 已提交
1525
      error:
L
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1526 1527 1528 1529 1530 1531 1532
	printk(KERN_ERR PREFIX "Could not use ECDT\n");
	kfree(ec_ecdt);
	ec_ecdt = NULL;

	return -ENODEV;
}

L
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1533
static int __init acpi_ec_init(void)
L
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1534
{
L
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1535
	int result = 0;
L
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1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559

	ACPI_FUNCTION_TRACE("acpi_ec_init");

	if (acpi_disabled)
		return_VALUE(0);

	acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
	if (!acpi_ec_dir)
		return_VALUE(-ENODEV);

	/* Now register the driver for the EC */
	result = acpi_bus_register_driver(&acpi_ec_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
		return_VALUE(-ENODEV);
	}

	return_VALUE(result);
}

subsys_initcall(acpi_ec_init);

/* EC driver currently not unloadable */
#if 0
L
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1560
static void __exit acpi_ec_exit(void)
L
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1561 1562 1563 1564 1565 1566 1567 1568 1569
{
	ACPI_FUNCTION_TRACE("acpi_ec_exit");

	acpi_bus_unregister_driver(&acpi_ec_driver);

	remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);

	return_VOID;
}
L
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1570
#endif				/* 0 */
L
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1571 1572 1573 1574 1575 1576

static int __init acpi_fake_ecdt_setup(char *str)
{
	acpi_fake_ecdt_enabled = 1;
	return 0;
}
1577

L
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1578
__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
1579
static int __init acpi_ec_set_intr_mode(char *str)
L
Luming Yu 已提交
1580
{
1581
	int intr;
1582

1583
	if (!get_option(&str, &intr))
1584 1585
		return 0;

1586 1587 1588
	if (intr) {
		acpi_ec_poll_mode = EC_INTR;
		acpi_ec_driver.ops.add = acpi_ec_intr_add;
1589
	} else {
1590 1591
		acpi_ec_poll_mode = EC_POLL;
		acpi_ec_driver.ops.add = acpi_ec_poll_add;
1592
	}
1593
	printk(KERN_INFO PREFIX "EC %s mode.\n", intr ? "interrupt" : "polling");
L
Luming Yu 已提交
1594 1595
	return 0;
}
L
Len Brown 已提交
1596

1597
__setup("ec_intr=", acpi_ec_set_intr_mode);