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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [acpi/] [ec.c] - Blame information for rev 67

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/*
 *  ec.c - ACPI Embedded Controller Driver (v2.0)
 *
 *  Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
 *  Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
 
/* Uncomment next line to get verbose print outs*/
/* #define DEBUG */
 
#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>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <asm/io.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <acpi/actypes.h>
 
#define ACPI_EC_CLASS                   "embedded_controller"
#define ACPI_EC_DEVICE_NAME             "Embedded Controller"
#define ACPI_EC_FILE_INFO               "info"
 
#undef PREFIX
#define PREFIX                          "ACPI: EC: "
 
/* EC status register */
#define ACPI_EC_FLAG_OBF        0x01    /* Output buffer full */
#define ACPI_EC_FLAG_IBF        0x02    /* Input buffer full */
#define ACPI_EC_FLAG_BURST      0x10    /* burst mode */
#define ACPI_EC_FLAG_SCI        0x20    /* EC-SCI occurred */
 
/* EC commands */
enum ec_command {
        ACPI_EC_COMMAND_READ = 0x80,
        ACPI_EC_COMMAND_WRITE = 0x81,
        ACPI_EC_BURST_ENABLE = 0x82,
        ACPI_EC_BURST_DISABLE = 0x83,
        ACPI_EC_COMMAND_QUERY = 0x84,
};
 
/* EC events */
enum ec_event {
        ACPI_EC_EVENT_OBF_1 = 1,        /* Output buffer full */
        ACPI_EC_EVENT_IBF_0,            /* Input buffer empty */
};
 
#define ACPI_EC_DELAY           500     /* Wait 500ms max. during EC ops */
#define ACPI_EC_UDELAY_GLK      1000    /* Wait 1ms max. to get global lock */
 
enum {
        EC_FLAGS_WAIT_GPE = 0,           /* Don't check status until GPE arrives */
        EC_FLAGS_QUERY_PENDING,         /* Query is pending */
        EC_FLAGS_GPE_MODE,              /* Expect GPE to be sent for status change */
        EC_FLAGS_NO_ADDRESS_GPE,        /* Expect GPE only for non-address event */
        EC_FLAGS_ADDRESS,               /* Address is being written */
        EC_FLAGS_NO_WDATA_GPE,          /* Don't expect WDATA GPE event */
        EC_FLAGS_WDATA,                 /* Data is being written */
        EC_FLAGS_NO_OBF1_GPE,           /* Don't expect GPE before read */
};
 
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 int acpi_ec_add(struct acpi_device *device);
 
static const struct acpi_device_id ec_device_ids[] = {
        {"PNP0C09", 0},
        {"", 0},
};
 
static struct acpi_driver acpi_ec_driver = {
        .name = "ec",
        .class = ACPI_EC_CLASS,
        .ids = ec_device_ids,
        .ops = {
                .add = acpi_ec_add,
                .remove = acpi_ec_remove,
                .start = acpi_ec_start,
                .stop = acpi_ec_stop,
                },
};
 
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
/* External interfaces use first EC only, so remember */
typedef int (*acpi_ec_query_func) (void *data);
 
struct acpi_ec_query_handler {
        struct list_head node;
        acpi_ec_query_func func;
        acpi_handle handle;
        void *data;
        u8 query_bit;
};
 
static struct acpi_ec {
        acpi_handle handle;
        unsigned long gpe;
        unsigned long command_addr;
        unsigned long data_addr;
        unsigned long global_lock;
        unsigned long flags;
        struct mutex lock;
        wait_queue_head_t wait;
        struct list_head list;
        u8 handlers_installed;
} *boot_ec, *first_ec;
 
/* --------------------------------------------------------------------------
                             Transaction Management
   -------------------------------------------------------------------------- */
 
static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
{
        u8 x = inb(ec->command_addr);
        pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
        return x;
}
 
static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
{
        u8 x = inb(ec->data_addr);
        pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
        return inb(ec->data_addr);
}
 
static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
{
        pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
        outb(command, ec->command_addr);
}
 
static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
{
        pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
        outb(data, ec->data_addr);
}
 
static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event)
{
        if (test_bit(EC_FLAGS_WAIT_GPE, &ec->flags))
                return 0;
        if (event == ACPI_EC_EVENT_OBF_1) {
                if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
                        return 1;
        } else if (event == ACPI_EC_EVENT_IBF_0) {
                if (!(acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF))
                        return 1;
        }
 
        return 0;
}
 
static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, int force_poll)
{
        int ret = 0;
 
        if (unlikely(event == ACPI_EC_EVENT_OBF_1 &&
                     test_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags)))
                force_poll = 1;
        if (unlikely(test_bit(EC_FLAGS_ADDRESS, &ec->flags) &&
                     test_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags)))
                force_poll = 1;
        if (unlikely(test_bit(EC_FLAGS_WDATA, &ec->flags) &&
                     test_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags)))
                force_poll = 1;
        if (likely(test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) &&
            likely(!force_poll)) {
                if (wait_event_timeout(ec->wait, acpi_ec_check_status(ec, event),
                                       msecs_to_jiffies(ACPI_EC_DELAY)))
                        goto end;
                clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
                if (acpi_ec_check_status(ec, event)) {
                        if (event == ACPI_EC_EVENT_OBF_1) {
                                /* miss OBF_1 GPE, don't expect it */
                                pr_info(PREFIX "missing OBF confirmation, "
                                        "don't expect it any longer.\n");
                                set_bit(EC_FLAGS_NO_OBF1_GPE, &ec->flags);
                        } else if (test_bit(EC_FLAGS_ADDRESS, &ec->flags)) {
                                /* miss address GPE, don't expect it anymore */
                                pr_info(PREFIX "missing address confirmation, "
                                        "don't expect it any longer.\n");
                                set_bit(EC_FLAGS_NO_ADDRESS_GPE, &ec->flags);
                        } else if (test_bit(EC_FLAGS_WDATA, &ec->flags)) {
                                /* miss write data GPE, don't expect it */
                                pr_info(PREFIX "missing write data confirmation, "
                                        "don't expect it any longer.\n");
                                set_bit(EC_FLAGS_NO_WDATA_GPE, &ec->flags);
                        } else {
                                /* missing GPEs, switch back to poll mode */
                                if (printk_ratelimit())
                                        pr_info(PREFIX "missing confirmations, "
                                                "switch off interrupt mode.\n");
                                clear_bit(EC_FLAGS_GPE_MODE, &ec->flags);
                        }
                        goto end;
                }
        } else {
                unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
                clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
                while (time_before(jiffies, delay)) {
                        if (acpi_ec_check_status(ec, event))
                                goto end;
                }
        }
        pr_err(PREFIX "acpi_ec_wait timeout,"
                               " status = %d, expect_event = %d\n",
                               acpi_ec_read_status(ec), event);
        ret = -ETIME;
      end:
        clear_bit(EC_FLAGS_ADDRESS, &ec->flags);
        return ret;
}
 
static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
                                        const u8 * wdata, unsigned wdata_len,
                                        u8 * rdata, unsigned rdata_len,
                                        int force_poll)
{
        int result = 0;
        set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
        acpi_ec_write_cmd(ec, command);
        pr_debug(PREFIX "transaction start\n");
        for (; wdata_len > 0; --wdata_len) {
                result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
                if (result) {
                        pr_err(PREFIX
                               "write_cmd timeout, command = %d\n", command);
                        goto end;
                }
                /* mark the address byte written to EC */
                if (rdata_len + wdata_len > 1)
                        set_bit(EC_FLAGS_ADDRESS, &ec->flags);
                set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
                acpi_ec_write_data(ec, *(wdata++));
        }
 
        if (!rdata_len) {
                set_bit(EC_FLAGS_WDATA, &ec->flags);
                result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, force_poll);
                if (result) {
                        pr_err(PREFIX
                               "finish-write timeout, command = %d\n", command);
                        goto end;
                }
        } else if (command == ACPI_EC_COMMAND_QUERY)
                clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
 
        for (; rdata_len > 0; --rdata_len) {
                result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, force_poll);
                if (result) {
                        pr_err(PREFIX "read timeout, command = %d\n", command);
                        goto end;
                }
                /* Don't expect GPE after last read */
                if (rdata_len > 1)
                        set_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
                *(rdata++) = acpi_ec_read_data(ec);
        }
      end:
        pr_debug(PREFIX "transaction end\n");
        return result;
}
 
static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
                               const u8 * wdata, unsigned wdata_len,
                               u8 * rdata, unsigned rdata_len,
                               int force_poll)
{
        int status;
        u32 glk;
 
        if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
                return -EINVAL;
 
        if (rdata)
                memset(rdata, 0, rdata_len);
 
        mutex_lock(&ec->lock);
        if (ec->global_lock) {
                status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
                if (ACPI_FAILURE(status)) {
                        mutex_unlock(&ec->lock);
                        return -ENODEV;
                }
        }
 
        status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
        if (status) {
                pr_err(PREFIX "input buffer is not empty, "
                                "aborting transaction\n");
                goto end;
        }
 
        status = acpi_ec_transaction_unlocked(ec, command,
                                              wdata, wdata_len,
                                              rdata, rdata_len,
                                              force_poll);
 
      end:
 
        if (ec->global_lock)
                acpi_release_global_lock(glk);
        mutex_unlock(&ec->lock);
 
        return status;
}
 
/*
 * Note: samsung nv5000 doesn't work with ec burst mode.
 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
 */
int acpi_ec_burst_enable(struct acpi_ec *ec)
{
        u8 d;
        return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1, 0);
}
 
int acpi_ec_burst_disable(struct acpi_ec *ec)
{
        return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0, 0);
}
 
static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
{
        int result;
        u8 d;
 
        result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_READ,
                                     &address, 1, &d, 1, 0);
        *data = d;
        return result;
}
 
static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
{
        u8 wdata[2] = { address, data };
        return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
                                   wdata, 2, NULL, 0, 0);
}
 
/*
 * Externally callable EC access functions. For now, assume 1 EC only
 */
int ec_burst_enable(void)
{
        if (!first_ec)
                return -ENODEV;
        return acpi_ec_burst_enable(first_ec);
}
 
EXPORT_SYMBOL(ec_burst_enable);
 
int ec_burst_disable(void)
{
        if (!first_ec)
                return -ENODEV;
        return acpi_ec_burst_disable(first_ec);
}
 
EXPORT_SYMBOL(ec_burst_disable);
 
int ec_read(u8 addr, u8 * val)
{
        int err;
        u8 temp_data;
 
        if (!first_ec)
                return -ENODEV;
 
        err = acpi_ec_read(first_ec, addr, &temp_data);
 
        if (!err) {
                *val = temp_data;
                return 0;
        } else
                return err;
}
 
EXPORT_SYMBOL(ec_read);
 
int ec_write(u8 addr, u8 val)
{
        int err;
 
        if (!first_ec)
                return -ENODEV;
 
        err = acpi_ec_write(first_ec, addr, val);
 
        return err;
}
 
EXPORT_SYMBOL(ec_write);
 
int ec_transaction(u8 command,
                   const u8 * wdata, unsigned wdata_len,
                   u8 * rdata, unsigned rdata_len,
                   int force_poll)
{
        if (!first_ec)
                return -ENODEV;
 
        return acpi_ec_transaction(first_ec, command, wdata,
                                   wdata_len, rdata, rdata_len,
                                   force_poll);
}
 
EXPORT_SYMBOL(ec_transaction);
 
static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
{
        int result;
        u8 d;
 
        if (!ec || !data)
                return -EINVAL;
 
        /*
         * 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).
         */
 
        result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1, 0);
        if (result)
                return result;
 
        if (!d)
                return -ENODATA;
 
        *data = d;
        return 0;
}
 
/* --------------------------------------------------------------------------
                                Event Management
   -------------------------------------------------------------------------- */
int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
                              acpi_handle handle, acpi_ec_query_func func,
                              void *data)
{
        struct acpi_ec_query_handler *handler =
            kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
        if (!handler)
                return -ENOMEM;
 
        handler->query_bit = query_bit;
        handler->handle = handle;
        handler->func = func;
        handler->data = data;
        mutex_lock(&ec->lock);
        list_add(&handler->node, &ec->list);
        mutex_unlock(&ec->lock);
        return 0;
}
 
EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
 
void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
{
        struct acpi_ec_query_handler *handler, *tmp;
        mutex_lock(&ec->lock);
        list_for_each_entry_safe(handler, tmp, &ec->list, node) {
                if (query_bit == handler->query_bit) {
                        list_del(&handler->node);
                        kfree(handler);
                }
        }
        mutex_unlock(&ec->lock);
}
 
EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
 
static void acpi_ec_gpe_query(void *ec_cxt)
{
        struct acpi_ec *ec = ec_cxt;
        u8 value = 0;
        struct acpi_ec_query_handler *handler, copy;
 
        if (!ec || acpi_ec_query(ec, &value))
                return;
        mutex_lock(&ec->lock);
        list_for_each_entry(handler, &ec->list, node) {
                if (value == handler->query_bit) {
                        /* have custom handler for this bit */
                        memcpy(&copy, handler, sizeof(copy));
                        mutex_unlock(&ec->lock);
                        if (copy.func) {
                                copy.func(copy.data);
                        } else if (copy.handle) {
                                acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
                        }
                        return;
                }
        }
        mutex_unlock(&ec->lock);
}
 
static u32 acpi_ec_gpe_handler(void *data)
{
        acpi_status status = AE_OK;
        struct acpi_ec *ec = data;
 
        pr_debug(PREFIX "~~~> interrupt\n");
        clear_bit(EC_FLAGS_WAIT_GPE, &ec->flags);
        if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))
                wake_up(&ec->wait);
 
        if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI) {
                if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
                        status = acpi_os_execute(OSL_EC_BURST_HANDLER,
                                acpi_ec_gpe_query, ec);
        } else if (unlikely(!test_bit(EC_FLAGS_GPE_MODE, &ec->flags))) {
                /* this is non-query, must be confirmation */
                if (printk_ratelimit())
                        pr_info(PREFIX "non-query interrupt received,"
                                " switching to interrupt mode\n");
                set_bit(EC_FLAGS_GPE_MODE, &ec->flags);
        }
 
        return ACPI_SUCCESS(status) ?
            ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
}
 
/* --------------------------------------------------------------------------
                             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.
         */
        *return_context = (function != ACPI_REGION_DEACTIVATE) ?
            handler_context : NULL;
 
        return AE_OK;
}
 
static acpi_status
acpi_ec_space_handler(u32 function, acpi_physical_address address,
                      u32 bits, acpi_integer *value,
                      void *handler_context, void *region_context)
{
        struct acpi_ec *ec = handler_context;
        int result = 0, i = 0;
        u8 temp = 0;
 
        if ((address > 0xFF) || !value || !handler_context)
                return AE_BAD_PARAMETER;
 
        if (function != ACPI_READ && function != ACPI_WRITE)
                return AE_BAD_PARAMETER;
 
        if (bits != 8 && acpi_strict)
                return AE_BAD_PARAMETER;
 
        while (bits - i > 0) {
                if (function == ACPI_READ) {
                        result = acpi_ec_read(ec, address, &temp);
                        (*value) |= ((acpi_integer)temp) << i;
                } else {
                        temp = 0xff & ((*value) >> i);
                        result = acpi_ec_write(ec, address, temp);
                }
                i += 8;
                ++address;
        }
 
        switch (result) {
        case -EINVAL:
                return AE_BAD_PARAMETER;
                break;
        case -ENODEV:
                return AE_NOT_FOUND;
                break;
        case -ETIME:
                return AE_TIME;
                break;
        default:
                return AE_OK;
        }
}
 
/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */
 
static struct proc_dir_entry *acpi_ec_dir;
 
static int acpi_ec_read_info(struct seq_file *seq, void *offset)
{
        struct acpi_ec *ec = seq->private;
 
        if (!ec)
                goto end;
 
        seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
        seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
                   (unsigned)ec->command_addr, (unsigned)ec->data_addr);
        seq_printf(seq, "use global lock:\t%s\n",
                   ec->global_lock ? "yes" : "no");
      end:
        return 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 = {
        .open = acpi_ec_info_open_fs,
        .read = seq_read,
        .llseek = seq_lseek,
        .release = single_release,
        .owner = THIS_MODULE,
};
 
static int acpi_ec_add_fs(struct acpi_device *device)
{
        struct proc_dir_entry *entry = NULL;
 
        if (!acpi_device_dir(device)) {
                acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
                                                     acpi_ec_dir);
                if (!acpi_device_dir(device))
                        return -ENODEV;
        }
 
        entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
                                  acpi_device_dir(device));
        if (!entry)
                return -ENODEV;
        else {
                entry->proc_fops = &acpi_ec_info_ops;
                entry->data = acpi_driver_data(device);
                entry->owner = THIS_MODULE;
        }
 
        return 0;
}
 
static int acpi_ec_remove_fs(struct acpi_device *device)
{
 
        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 0;
}
 
/* --------------------------------------------------------------------------
                               Driver Interface
   -------------------------------------------------------------------------- */
static acpi_status
ec_parse_io_ports(struct acpi_resource *resource, void *context);
 
static struct acpi_ec *make_acpi_ec(void)
{
        struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
        if (!ec)
                return NULL;
        ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
        mutex_init(&ec->lock);
        init_waitqueue_head(&ec->wait);
        INIT_LIST_HEAD(&ec->list);
        return ec;
}
 
static acpi_status
acpi_ec_register_query_methods(acpi_handle handle, u32 level,
                               void *context, void **return_value)
{
        struct acpi_namespace_node *node = handle;
        struct acpi_ec *ec = context;
        int value = 0;
        if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
                acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
        }
        return AE_OK;
}
 
static acpi_status
ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
{
        acpi_status status;
 
        struct acpi_ec *ec = context;
        status = acpi_walk_resources(handle, METHOD_NAME__CRS,
                                     ec_parse_io_ports, ec);
        if (ACPI_FAILURE(status))
                return status;
 
        /* Get GPE bit assignment (EC events). */
        /* TODO: Add support for _GPE returning a package */
        status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
        if (ACPI_FAILURE(status))
                return status;
        /* Find and register all query methods */
        acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
                            acpi_ec_register_query_methods, ec, NULL);
        /* Use the global lock for all EC transactions? */
        acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
        ec->handle = handle;
        return AE_CTRL_TERMINATE;
}
 
static void ec_remove_handlers(struct acpi_ec *ec)
{
        if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
                                ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
                pr_err(PREFIX "failed to remove space handler\n");
        if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
                                &acpi_ec_gpe_handler)))
                pr_err(PREFIX "failed to remove gpe handler\n");
        ec->handlers_installed = 0;
}
 
static int acpi_ec_add(struct acpi_device *device)
{
        struct acpi_ec *ec = NULL;
 
        if (!device)
                return -EINVAL;
        strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
        strcpy(acpi_device_class(device), ACPI_EC_CLASS);
 
        /* Check for boot EC */
        if (boot_ec) {
                if (boot_ec->handle == device->handle) {
                        /* Pre-loaded EC from DSDT, just move pointer */
                        ec = boot_ec;
                        boot_ec = NULL;
                        goto end;
                } else if (boot_ec->handle == ACPI_ROOT_OBJECT) {
                        /* ECDT-based EC, time to shut it down */
                        ec_remove_handlers(boot_ec);
                        kfree(boot_ec);
                        first_ec = boot_ec = NULL;
                }
        }
 
        ec = make_acpi_ec();
        if (!ec)
                return -ENOMEM;
 
        if (ec_parse_device(device->handle, 0, ec, NULL) !=
            AE_CTRL_TERMINATE) {
                kfree(ec);
                return -EINVAL;
        }
        ec->handle = device->handle;
      end:
        if (!first_ec)
                first_ec = ec;
        acpi_driver_data(device) = ec;
        acpi_ec_add_fs(device);
        pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
                          ec->gpe, ec->command_addr, ec->data_addr);
        pr_info(PREFIX "driver started in %s mode\n",
                (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll");
        return 0;
}
 
static int acpi_ec_remove(struct acpi_device *device, int type)
{
        struct acpi_ec *ec;
        struct acpi_ec_query_handler *handler, *tmp;
 
        if (!device)
                return -EINVAL;
 
        ec = acpi_driver_data(device);
        mutex_lock(&ec->lock);
        list_for_each_entry_safe(handler, tmp, &ec->list, node) {
                list_del(&handler->node);
                kfree(handler);
        }
        mutex_unlock(&ec->lock);
        acpi_ec_remove_fs(device);
        acpi_driver_data(device) = NULL;
        if (ec == first_ec)
                first_ec = NULL;
        kfree(ec);
        return 0;
}
 
static acpi_status
ec_parse_io_ports(struct acpi_resource *resource, void *context)
{
        struct acpi_ec *ec = context;
 
        if (resource->type != ACPI_RESOURCE_TYPE_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 == 0)
                ec->data_addr = resource->data.io.minimum;
        else if (ec->command_addr == 0)
                ec->command_addr = resource->data.io.minimum;
        else
                return AE_CTRL_TERMINATE;
 
        return AE_OK;
}
 
static int ec_install_handlers(struct acpi_ec *ec)
{
        acpi_status status;
        if (ec->handlers_installed)
                return 0;
        status = acpi_install_gpe_handler(NULL, ec->gpe,
                                          ACPI_GPE_EDGE_TRIGGERED,
                                          &acpi_ec_gpe_handler, ec);
        if (ACPI_FAILURE(status))
                return -ENODEV;
 
        acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
        acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
 
        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, &acpi_ec_gpe_handler);
                return -ENODEV;
        }
 
        ec->handlers_installed = 1;
        return 0;
}
 
static int acpi_ec_start(struct acpi_device *device)
{
        struct acpi_ec *ec;
        int ret = 0;
 
        if (!device)
                return -EINVAL;
 
        ec = acpi_driver_data(device);
 
        if (!ec)
                return -EINVAL;
 
        ret = ec_install_handlers(ec);
 
        /* EC is fully operational, allow queries */
        clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
        return ret;
}
 
static int acpi_ec_stop(struct acpi_device *device, int type)
{
        struct acpi_ec *ec;
        if (!device)
                return -EINVAL;
        ec = acpi_driver_data(device);
        if (!ec)
                return -EINVAL;
        ec_remove_handlers(ec);
 
        return 0;
}
 
int __init acpi_boot_ec_enable(void)
{
        if (!boot_ec || boot_ec->handlers_installed)
                return 0;
        if (!ec_install_handlers(boot_ec)) {
                first_ec = boot_ec;
                return 0;
        }
        return -EFAULT;
}
 
int __init acpi_ec_ecdt_probe(void)
{
        int ret;
        acpi_status status;
        struct acpi_table_ecdt *ecdt_ptr;
 
        boot_ec = make_acpi_ec();
        if (!boot_ec)
                return -ENOMEM;
        /*
         * Generate a boot ec context
         */
        status = acpi_get_table(ACPI_SIG_ECDT, 1,
                                (struct acpi_table_header **)&ecdt_ptr);
        if (ACPI_SUCCESS(status)) {
                pr_info(PREFIX "EC description table is found, configuring boot EC\n");
                boot_ec->command_addr = ecdt_ptr->control.address;
                boot_ec->data_addr = ecdt_ptr->data.address;
                boot_ec->gpe = ecdt_ptr->gpe;
                boot_ec->handle = ACPI_ROOT_OBJECT;
        } else {
                /* This workaround is needed only on some broken machines,
                 * which require early EC, but fail to provide ECDT */
                acpi_handle x;
                printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
                status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
                                                boot_ec, NULL);
                /* Check that acpi_get_devices actually find something */
                if (ACPI_FAILURE(status) || !boot_ec->handle)
                        goto error;
                /* We really need to limit this workaround, the only ASUS,
                 * which needs it, has fake EC._INI method, so use it as flag.
                 * Keep boot_ec struct as it will be needed soon.
                 */
                if (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x)))
                        return -ENODEV;
        }
 
        ret = ec_install_handlers(boot_ec);
        if (!ret) {
                first_ec = boot_ec;
                return 0;
        }
      error:
        kfree(boot_ec);
        boot_ec = NULL;
        return -ENODEV;
}
 
static int __init acpi_ec_init(void)
{
        int result = 0;
 
        if (acpi_disabled)
                return 0;
 
        acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
        if (!acpi_ec_dir)
                return -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 -ENODEV;
        }
 
        return result;
}
 
subsys_initcall(acpi_ec_init);
 
/* EC driver currently not unloadable */
#if 0
static void __exit acpi_ec_exit(void)
{
 
        acpi_bus_unregister_driver(&acpi_ec_driver);
 
        remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
 
        return;
}
#endif  /* 0 */
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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [acpi/] [ec.c] - Blame information for rev 67

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* ec.c - ACPI Embedded Controller Driver (v2.0)`
3			`*`
4			`* Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>`
5			`* Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com>`
6			`* Copyright (C) 2004 Luming Yu <luming.yu@intel.com>`
7			`* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>`
8			`* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>`
9			`*`
10			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
11			`*`
12			`* This program is free software; you can redistribute it and/or modify`
13			`* it under the terms of the GNU General Public License as published by`
14			`* the Free Software Foundation; either version 2 of the License, or (at`
15			`* your option) any later version.`
16			`*`
17			`* This program is distributed in the hope that it will be useful, but`
18			`* WITHOUT ANY WARRANTY; without even the implied warranty of`
19			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
20			`* General Public License for more details.`
21			`*`
22			`* You should have received a copy of the GNU General Public License along`
23			`* with this program; if not, write to the Free Software Foundation, Inc.,`
24			`* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.`
25			`*`
26			`* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`
27			`*/`
28
29			`/* Uncomment next line to get verbose print outs*/`
30			`/* #define DEBUG */`
31
32			`#include <linux/kernel.h>`
33			`#include <linux/module.h>`
34			`#include <linux/init.h>`
35			`#include <linux/types.h>`
36			`#include <linux/delay.h>`
37			`#include <linux/proc_fs.h>`
38			`#include <linux/seq_file.h>`
39			`#include <linux/interrupt.h>`
40			`#include <linux/list.h>`