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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [ec.c] - Blame information for rev 1774

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/*
 *  acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 1.1.1.1 $)
 *
 *  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/compatmac.h>
#include <linux/proc_fs.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/actypes.h>
 
#define _COMPONENT              ACPI_EC_COMPONENT
ACPI_MODULE_NAME                ("acpi_ec")
 
#define PREFIX                  "ACPI: "
 
 
#define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
#define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
#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 */
 
#define ACPI_EC_UDELAY          100     /* Poll @ 100us increments */
#define ACPI_EC_UDELAY_COUNT    1000    /* Wait 10ms max. during EC ops */
#define ACPI_EC_UDELAY_GLK      1000    /* Wait 1ms max. to get global lock */
 
#define ACPI_EC_COMMAND_READ    0x80
#define ACPI_EC_COMMAND_WRITE   0x81
#define ACPI_EC_COMMAND_QUERY   0x84
 
static int acpi_ec_add (struct acpi_device *device);
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);
 
static struct acpi_driver acpi_ec_driver = {
        .name =         ACPI_EC_DRIVER_NAME,
        .class =        ACPI_EC_CLASS,
        .ids =          ACPI_EC_HID,
        .ops =          {
                                .add =          acpi_ec_add,
                                .remove =       acpi_ec_remove,
                                .start =        acpi_ec_start,
                                .stop =         acpi_ec_stop,
                        },
};
 
struct acpi_ec {
        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;
};
 
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
static struct acpi_ec   *ec_ecdt;
 
/* External interfaces use first EC only, so remember */
static struct acpi_device *first_ec;
 
/* --------------------------------------------------------------------------
                             Transaction Management
   -------------------------------------------------------------------------- */
 
static int
acpi_ec_wait (
        struct acpi_ec          *ec,
        u8                      event)
{
        u32                     acpi_ec_status = 0;
        u32                     i = ACPI_EC_UDELAY_COUNT;
 
        if (!ec)
                return -EINVAL;
 
        /* Poll the EC status register waiting for the event to occur. */
        switch (event) {
        case ACPI_EC_EVENT_OBF:
                do {
                        acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
                        if (acpi_ec_status & ACPI_EC_FLAG_OBF)
                                return 0;
                        udelay(ACPI_EC_UDELAY);
                } while (--i>0);
                break;
        case ACPI_EC_EVENT_IBE:
                do {
                        acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
                        if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
                                return 0;
                        udelay(ACPI_EC_UDELAY);
                } while (--i>0);
                break;
        default:
                return -EINVAL;
        }
 
        return -ETIME;
}
 
 
static int
acpi_ec_read (
        struct acpi_ec          *ec,
        u8                      address,
        u32                     *data)
{
        acpi_status             status = AE_OK;
        int                     result = 0;
        unsigned long           flags = 0;
        u32                     glk = 0;
 
        ACPI_FUNCTION_TRACE("acpi_ec_read");
 
        if (!ec || !data)
                return_VALUE(-EINVAL);
 
        *data = 0;
 
        if (ec->global_lock) {
                status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
                if (ACPI_FAILURE(status))
                        return_VALUE(-ENODEV);
        }
 
        spin_lock_irqsave(&ec->lock, flags);
 
        acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
        result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
        if (result)
                goto end;
 
        acpi_hw_low_level_write(8, address, &ec->data_addr);
        result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
        if (result)
                goto end;
 
 
        acpi_hw_low_level_read(8, data, &ec->data_addr);
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
                *data, address));
 
end:
        spin_unlock_irqrestore(&ec->lock, flags);
 
        if (ec->global_lock)
                acpi_release_global_lock(glk);
 
        return_VALUE(result);
}
 
 
static int
acpi_ec_write (
        struct acpi_ec          *ec,
        u8                      address,
        u8                      data)
{
        int                     result = 0;
        acpi_status             status = AE_OK;
        unsigned long           flags = 0;
        u32                     glk = 0;
 
        ACPI_FUNCTION_TRACE("acpi_ec_write");
 
        if (!ec)
                return_VALUE(-EINVAL);
 
        if (ec->global_lock) {
                status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
                if (ACPI_FAILURE(status))
                        return_VALUE(-ENODEV);
        }
 
        spin_lock_irqsave(&ec->lock, flags);
 
        acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
        result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
        if (result)
                goto end;
 
        acpi_hw_low_level_write(8, address, &ec->data_addr);
        result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
        if (result)
                goto end;
 
        acpi_hw_low_level_write(8, data, &ec->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",
                data, address));
 
end:
        spin_unlock_irqrestore(&ec->lock, flags);
 
        if (ec->global_lock)
                acpi_release_global_lock(glk);
 
        return_VALUE(result);
}
 
/*
 * Externally callable EC access functions. For now, assume 1 EC only
 */
int
ec_read(u8 addr, u8 *val)
{
        struct acpi_ec *ec;
        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;
        }
        else
                return err;
}
 
int
ec_write(u8 addr, u8 val)
{
        struct acpi_ec *ec;
        int err;
 
        if (!first_ec)
                return -ENODEV;
 
        ec = acpi_driver_data(first_ec);
 
        err = acpi_ec_write(ec, addr, val);
 
        return err;
}
 
 
static int
acpi_ec_query (
        struct acpi_ec          *ec,
        u32                     *data)
{
        int                     result = 0;
        acpi_status             status = AE_OK;
        unsigned long           flags = 0;
        u32                     glk = 0;
 
        ACPI_FUNCTION_TRACE("acpi_ec_query");
 
        if (!ec || !data)
                return_VALUE(-EINVAL);
 
        *data = 0;
 
        if (ec->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).
         */
        spin_lock_irqsave(&ec->lock, flags);
 
        acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
        result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
        if (result)
                goto end;
 
        acpi_hw_low_level_read(8, data, &ec->data_addr);
        if (!*data)
                result = -ENODATA;
 
end:
        spin_unlock_irqrestore(&ec->lock, flags);
 
        if (ec->global_lock)
                acpi_release_global_lock(glk);
 
        return_VALUE(result);
}
 
 
/* --------------------------------------------------------------------------
                                Event Management
   -------------------------------------------------------------------------- */
 
struct acpi_ec_query_data {
        acpi_handle             handle;
        u8                      data;
};
 
static void
acpi_ec_gpe_query (
        void                    *ec_cxt)
{
        struct acpi_ec          *ec = (struct 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'};
 
        ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
 
        if (!ec_cxt)
                goto end;
 
        spin_lock_irqsave(&ec->lock, flags);
        acpi_hw_low_level_read(8, &value, &ec->command_addr);
        spin_unlock_irqrestore(&ec->lock, flags);
 
        /* 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->handle, object_name, NULL, NULL);
 
end:
        acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
}
 
static void
acpi_ec_gpe_handler (
        void                    *data)
{
        acpi_status             status = AE_OK;
        struct acpi_ec          *ec = (struct acpi_ec *) data;
 
        if (!ec)
                return;
 
        acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
 
        status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
                acpi_ec_gpe_query, ec);
}
 
/* --------------------------------------------------------------------------
                             Address Space Management
   -------------------------------------------------------------------------- */
 
static acpi_status
acpi_ec_space_setup (
        acpi_handle             region_handle,
        u32                     function,
        void                    *handler_context,
        void                    **return_context)
{
        /*
         * The EC object is in the handler context and is needed
         * when calling the acpi_ec_space_handler.
         */
        if(function == ACPI_REGION_DEACTIVATE)
                *return_context = NULL;
        else
                *return_context = handler_context;
 
        return AE_OK;
}
 
 
static acpi_status
acpi_ec_space_handler (
        u32                     function,
        acpi_physical_address   address,
        u32                     bit_width,
        acpi_integer            *value,
        void                    *handler_context,
        void                    *region_context)
{
        int                     result = 0;
        struct acpi_ec          *ec = NULL;
        u32                     temp = 0;
 
        ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
 
        if ((address > 0xFF) || (bit_width != 8) || !value || !handler_context)
                return_VALUE(AE_BAD_PARAMETER);
 
        ec = (struct acpi_ec *) handler_context;
 
        switch (function) {
        case ACPI_READ:
                result = acpi_ec_read(ec, (u8) address, &temp);
                *value = (acpi_integer) temp;
                break;
        case ACPI_WRITE:
                result = acpi_ec_write(ec, (u8) address, (u8) *value);
                break;
        default:
                result = -EINVAL;
                break;
        }
 
        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)
   -------------------------------------------------------------------------- */
 
struct proc_dir_entry           *acpi_ec_dir;
 
 
static int
acpi_ec_read_info (
        char                    *page,
        char                    **start,
        off_t                   off,
        int                     count,
        int                     *eof,
        void                    *data)
{
        struct acpi_ec          *ec = (struct acpi_ec *) data;
        char                    *p = page;
        int                     len = 0;
 
        ACPI_FUNCTION_TRACE("acpi_ec_read_info");
 
        if (!ec || (off != 0))
                goto end;
 
        p += sprintf(p, "gpe bit:                 0x%02x\n",
                (u32) ec->gpe_bit);
        p += sprintf(p, "ports:                   0x%02x, 0x%02x\n",
                (u32) ec->status_addr.address, (u32) ec->data_addr.address);
        p += sprintf(p, "use global lock:         %s\n",
                ec->global_lock?"yes":"no");
 
end:
        len = (p - page);
        if (len <= off+count) *eof = 1;
        *start = page + off;
        len -= off;
        if (len>count) len = count;
        if (len<0) len = 0;
 
        return_VALUE(len);
}
 
 
static int
acpi_ec_add_fs (
        struct acpi_device      *device)
{
        struct proc_dir_entry   *entry = NULL;
 
        ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
 
        if (!acpi_device_dir(device)) {
                acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
                        acpi_ec_dir);
                if (!acpi_device_dir(device))
                        return_VALUE(-ENODEV);
        }
 
        entry = create_proc_read_entry(ACPI_EC_FILE_INFO, S_IRUGO,
                acpi_device_dir(device), acpi_ec_read_info,
                acpi_driver_data(device));
        if (!entry)
                ACPI_DEBUG_PRINT((ACPI_DB_WARN,
                        "Unable to create '%s' fs entry\n",
                        ACPI_EC_FILE_INFO));
 
        return_VALUE(0);
}
 
 
static int
acpi_ec_remove_fs (
        struct acpi_device      *device)
{
        ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
 
        return_VALUE(0);
}
 
 
/* --------------------------------------------------------------------------
                               Driver Interface
   -------------------------------------------------------------------------- */
 
static int
acpi_ec_add (
        struct acpi_device      *device)
{
        int                     result = 0;
        acpi_status             status = AE_OK;
        struct acpi_ec          *ec = NULL;
        unsigned long           uid;
 
        ACPI_FUNCTION_TRACE("acpi_ec_add");
 
        if (!device)
                return_VALUE(-EINVAL);
 
        ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
        if (!ec)
                return_VALUE(-ENOMEM);
        memset(ec, 0, sizeof(struct acpi_ec));
 
        ec->handle = device->handle;
        ec->uid = -1;
        ec->lock = SPIN_LOCK_UNLOCKED;
        sprintf(acpi_device_name(device), "%s", ACPI_EC_DEVICE_NAME);
        sprintf(acpi_device_class(device), "%s", ACPI_EC_CLASS);
        acpi_driver_data(device) = ec;
 
        /* Use the global lock for all EC transactions? */
        acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock);
 
        /* If our UID matches the UID for the ECDT-enumerated EC,
           we now have the *real* EC info, so kill the makeshift one.*/
        acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid);
        if (ec_ecdt && ec_ecdt->uid == uid) {
                acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
                        ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
 
                acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler);
 
                kfree(ec_ecdt);
        }
 
        /* Get GPE bit assignment (EC events). */
        /* TODO: Add support for _GPE returning a package */
        status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit);
        if (ACPI_FAILURE(status)) {
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
                        "Error obtaining GPE bit assignment\n"));
                result = -ENODEV;
                goto end;
        }
 
        result = acpi_ec_add_fs(device);
        if (result)
                goto end;
 
        printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
                acpi_device_name(device), acpi_device_bid(device),
                (u32) ec->gpe_bit);
 
        if (!first_ec)
                first_ec = device;
 
end:
        if (result)
                kfree(ec);
 
        return_VALUE(result);
}
 
 
static int
acpi_ec_remove (
        struct acpi_device      *device,
        int                     type)
{
        struct acpi_ec          *ec = NULL;
 
        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
acpi_ec_io_ports (
        struct acpi_resource    *resource,
        void                    *context)
{
        struct acpi_ec          *ec = (struct acpi_ec *) context;
        struct acpi_generic_address *addr;
 
        if (resource->id != ACPI_RSTYPE_IO) {
                return AE_OK;
        }
 
        /*
         * The first address region returned is the data port, and
         * the second address region returned is the status/command
         * port.
         */
        if (ec->data_addr.register_bit_width == 0) {
                addr = &ec->data_addr;
        } else if (ec->command_addr.register_bit_width == 0) {
                addr = &ec->command_addr;
        } else {
                return AE_CTRL_TERMINATE;
        }
 
        addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
        addr->register_bit_width = 8;
        addr->register_bit_offset = 0;
        addr->address = resource->data.io.min_base_address;
 
        return AE_OK;
}
 
 
static int
acpi_ec_start (
        struct acpi_device      *device)
{
        acpi_status             status = AE_OK;
        struct acpi_ec          *ec = NULL;
 
        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.
         */
        status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
                acpi_ec_io_ports, ec);
        if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) {
                ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
                return_VALUE(-ENODEV);
        }
 
        ec->status_addr = ec->command_addr;
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
                (u32) ec->gpe_bit, (u32) ec->command_addr.address,
                (u32) ec->data_addr.address));
 
        /*
         * Install GPE handler
         */
        status = acpi_install_gpe_handler(NULL, ec->gpe_bit,
                ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
        if (ACPI_FAILURE(status)) {
                return_VALUE(-ENODEV);
        }
 
        status = acpi_install_address_space_handler (ec->handle,
                        ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
                        &acpi_ec_space_setup, ec);
        if (ACPI_FAILURE(status)) {
                acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
                return_VALUE(-ENODEV);
        }
 
        return_VALUE(AE_OK);
}
 
 
static int
acpi_ec_stop (
        struct acpi_device      *device,
        int                     type)
{
        acpi_status             status = AE_OK;
        struct acpi_ec          *ec = NULL;
 
        ACPI_FUNCTION_TRACE("acpi_ec_stop");
 
        if (!device)
                return_VALUE(-EINVAL);
 
        ec = acpi_driver_data(device);
 
        status = acpi_remove_address_space_handler(ec->handle,
                ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
        if (ACPI_FAILURE(status))
                return_VALUE(-ENODEV);
 
        status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
        if (ACPI_FAILURE(status))
                return_VALUE(-ENODEV);
 
        return_VALUE(0);
}
 
 
int __init
acpi_ec_ecdt_probe (void)
{
        acpi_status             status;
        struct acpi_table_ecdt  *ecdt_ptr;
 
        status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
                (struct acpi_table_header **) &ecdt_ptr);
        if (ACPI_FAILURE(status))
                return 0;
 
        printk(KERN_INFO PREFIX "Found ECDT\n");
 
         /*
         * Generate a temporary ec context to use until the namespace is scanned
         */
        ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
        if (!ec_ecdt)
                return -ENOMEM;
        memset(ec_ecdt, 0, sizeof(struct acpi_ec));
 
        ec_ecdt->command_addr = ecdt_ptr->ec_control;
        ec_ecdt->status_addr = ecdt_ptr->ec_control;
        ec_ecdt->data_addr = ecdt_ptr->ec_data;
        ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
        ec_ecdt->lock = SPIN_LOCK_UNLOCKED;
        /* use the GL just to be safe */
        ec_ecdt->global_lock = TRUE;
        ec_ecdt->uid = ecdt_ptr->uid;
 
        status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
        if (ACPI_FAILURE(status)) {
                goto error;
        }
 
        /*
         * Install GPE handler
         */
        status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit,
                ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
                ec_ecdt);
        if (ACPI_FAILURE(status)) {
                goto error;
        }
 
        status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT,
                        ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
                        &acpi_ec_space_setup, ec_ecdt);
        if (ACPI_FAILURE(status)) {
                acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit,
                        &acpi_ec_gpe_handler);
                goto error;
        }
 
        return 0;
 
error:
        printk(KERN_ERR PREFIX "Could not use ECDT\n");
        kfree(ec_ecdt);
        ec_ecdt = NULL;
 
        return -ENODEV;
}
 
 
int __init
acpi_ec_init (void)
{
        int                     result = 0;
 
        ACPI_FUNCTION_TRACE("acpi_ec_init");
 
        acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
        if (!acpi_ec_dir)
                return_VALUE(-ENODEV);
 
        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(0);
}
 
/* EC can't be unloaded atm, so don't compile these */
#if 0
void __exit
acpi_ec_exit (void)
{
        ACPI_FUNCTION_TRACE("acpi_ec_exit");
 
        acpi_bus_unregister_driver(&acpi_ec_driver);
 
        remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
 
        return_VOID;
}
#endif /* 0 */
 
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [acpi/] [ec.c] - Blame information for rev 1774

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 1.1.1.1 $)`
3			`*`
4			`* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>`
5			`* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>`
6			`*`
7			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
8			`*`
9			`* This program is free software; you can redistribute it and/or modify`
10			`* it under the terms of the GNU General Public License as published by`
11			`* the Free Software Foundation; either version 2 of the License, or (at`
12			`* your option) any later version.`
13			`*`
14			`* This program is distributed in the hope that it will be useful, but`
15			`* WITHOUT ANY WARRANTY; without even the implied warranty of`
16			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
17			`* General Public License for more details.`
18			`*`
19			`* You should have received a copy of the GNU General Public License along`
20			`* with this program; if not, write to the Free Software Foundation, Inc.,`
21			`* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.`
22			`*`
23			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
24			`*/`
25
26			`#include <linux/kernel.h>`
27			`#include <linux/module.h>`
28			`#include <linux/init.h>`
29			`#include <linux/types.h>`
30			`#include <linux/delay.h>`
31			`#include <linux/compatmac.h>`
32			`#include <linux/proc_fs.h>`
33			`#include <asm/io.h>`
34			`#include <acpi/acpi_bus.h>`
35			`#include <acpi/acpi_drivers.h>`
36			`#include <acpi/actypes.h>`
37
38			`#define _COMPONENT ACPI_EC_COMPONENT`
39			`ACPI_MODULE_NAME ("acpi_ec")`
40