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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>
- #include <linux/interrupt.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 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 */
- #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
- #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_DELAY 50 /* Wait 50ms 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_BURST_ENABLE 0x82
- #define ACPI_EC_BURST_DISABLE 0x83
- #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;
- 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;
- };
- /* 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 inline u32 acpi_ec_read_status(struct acpi_ec *ec)
- {
- u32 status = 0;
- acpi_hw_low_level_read(8, &status, &ec->status_addr);
- return status;
- }
- static int acpi_ec_wait(struct acpi_ec *ec, unsigned int event)
- {
- int result = 0;
- ACPI_FUNCTION_TRACE("acpi_ec_wait");
- ec->expect_event = event;
- smp_mb();
- result = wait_event_interruptible_timeout(ec->wait,
- !ec->expect_event,
- msecs_to_jiffies(ACPI_EC_DELAY));
-
- ec->expect_event = 0;
- smp_mb();
- if (result < 0){
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result = %d ", result));
- return_VALUE(result);
- }
- /*
- * 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.
- */
- switch (event) {
- case ACPI_EC_EVENT_OBF:
- if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
- return_VALUE(0);
- break;
- case ACPI_EC_EVENT_IBE:
- if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
- return_VALUE(0);
- break;
- }
- return_VALUE(-ETIME);
- }
- static int
- acpi_ec_enter_burst_mode (
- struct acpi_ec *ec)
- {
- u32 tmp = 0;
- int status = 0;
- ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
- status = acpi_ec_read_status(ec);
- if (status != -EINVAL &&
- !(status & ACPI_EC_FLAG_BURST)){
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"entering burst mode \n"));
- acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
- if (status){
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR," status = %d\n", status));
- return_VALUE(-EINVAL);
- }
- acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- if(tmp != 0x90 ) {/* Burst ACK byte*/
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Ack failed \n"));
- return_VALUE(-EINVAL);
- }
- } else
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in burst mode \n"));
- atomic_set(&ec->leaving_burst , 0);
- return_VALUE(0);
- }
- static int
- acpi_ec_leave_burst_mode (
- struct acpi_ec *ec)
- {
- int status =0;
- ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
- atomic_set(&ec->leaving_burst , 1);
- status = acpi_ec_read_status(ec);
- if (status != -EINVAL &&
- (status & ACPI_EC_FLAG_BURST)){
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n"));
- acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr);
- status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
- if (status){
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n"));
- return_VALUE(-EINVAL);
- }
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- status = acpi_ec_read_status(ec);
- if (status != -EINVAL &&
- (status & ACPI_EC_FLAG_BURST)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->status fail\n"));
- return_VALUE(-EINVAL);
- }
- }else
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in Non-burst mode \n"));
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n"));
- return_VALUE(0);
- }
- static int
- acpi_ec_read (
- struct acpi_ec *ec,
- u8 address,
- u32 *data)
- {
- int status = 0;
- u32 glk;
- ACPI_FUNCTION_TRACE("acpi_ec_read");
- if (!ec || !data)
- return_VALUE(-EINVAL);
- retry:
- *data = 0;
- if (ec->global_lock) {
- status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
- if (ACPI_FAILURE(status))
- return_VALUE(-ENODEV);
- }
- WARN_ON(in_interrupt());
- down(&ec->sem);
- if(acpi_ec_enter_burst_mode(ec))
- goto end;
- acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- if (status) {
- goto end;
- }
- acpi_hw_low_level_write(8, address, &ec->data_addr);
- status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
- if (status){
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- goto end;
- }
- acpi_hw_low_level_read(8, data, &ec->data_addr);
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
- *data, address));
-
- end:
- acpi_ec_leave_burst_mode(ec);
- up(&ec->sem);
- if (ec->global_lock)
- acpi_release_global_lock(glk);
- if(atomic_read(&ec->leaving_burst) == 2){
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
- while(!atomic_read(&ec->pending_gpe)){
- msleep(1);
- }
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- goto retry;
- }
- return_VALUE(status);
- }
- static int
- acpi_ec_write (
- struct acpi_ec *ec,
- u8 address,
- u8 data)
- {
- int status = 0;
- u32 glk;
- u32 tmp;
- ACPI_FUNCTION_TRACE("acpi_ec_write");
- if (!ec)
- return_VALUE(-EINVAL);
- retry:
- if (ec->global_lock) {
- status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
- if (ACPI_FAILURE(status))
- return_VALUE(-ENODEV);
- }
- WARN_ON(in_interrupt());
- down(&ec->sem);
- if(acpi_ec_enter_burst_mode(ec))
- goto end;
- status = acpi_ec_read_status(ec);
- if (status != -EINVAL &&
- !(status & ACPI_EC_FLAG_BURST)){
- acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
- if (status)
- goto end;
- acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
- if(tmp != 0x90 ) /* Burst ACK byte*/
- goto end;
- }
- /*Now we are in burst mode*/
- acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- if (status){
- goto end;
- }
- acpi_hw_low_level_write(8, address, &ec->data_addr);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
- if (status){
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- goto end;
- }
- acpi_hw_low_level_write(8, data, &ec->data_addr);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- if (status)
- goto end;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
- data, address));
- end:
- acpi_ec_leave_burst_mode(ec);
- up(&ec->sem);
- if (ec->global_lock)
- acpi_release_global_lock(glk);
- if(atomic_read(&ec->leaving_burst) == 2){
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
- while(!atomic_read(&ec->pending_gpe)){
- msleep(1);
- }
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- goto retry;
- }
- return_VALUE(status);
- }
- /*
- * 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;
- }
- EXPORT_SYMBOL(ec_read);
- 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;
- }
- EXPORT_SYMBOL(ec_write);
- static int
- acpi_ec_query (
- struct acpi_ec *ec,
- u32 *data)
- {
- int status = 0;
- u32 glk;
- ACPI_FUNCTION_TRACE("acpi_ec_query");
- if (!ec || !data)
- return_VALUE(-EINVAL);
- retry:
- *data = 0;
- if (ec->global_lock) {
- status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
- if (ACPI_FAILURE(status))
- return_VALUE(-ENODEV);
- }
- down(&ec->sem);
- if(acpi_ec_enter_burst_mode(ec))
- goto end;
- /*
- * 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).
- */
- acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
- if (status){
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- goto end;
- }
- acpi_hw_low_level_read(8, data, &ec->data_addr);
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- if (!*data)
- status = -ENODATA;
- end:
- acpi_ec_leave_burst_mode(ec);
- up(&ec->sem);
- if (ec->global_lock)
- acpi_release_global_lock(glk);
- if(atomic_read(&ec->leaving_burst) == 2){
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
- while(!atomic_read(&ec->pending_gpe)){
- msleep(1);
- }
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
- goto retry;
- }
- return_VALUE(status);
- }
- /* --------------------------------------------------------------------------
- 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;
- 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'};
- ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
- if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
- result = acpi_ec_query(ec, &value);
- if (result)
- 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);
- atomic_dec(&ec->pending_gpe);
- end:
- return;
- }
- static u32
- acpi_ec_gpe_handler (
- void *data)
- {
- acpi_status status = AE_OK;
- u32 value;
- struct acpi_ec *ec = (struct acpi_ec *) data;
- if (!ec)
- return ACPI_INTERRUPT_NOT_HANDLED;
- acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
- value = acpi_ec_read_status(ec);
- if((value & ACPI_EC_FLAG_IBF) &&
- !(value & ACPI_EC_FLAG_BURST) &&
- (atomic_read(&ec->leaving_burst) == 0)) {
- /*
- * the embedded controller disables
- * burst mode for any reason other
- * than the burst disable command
- * to process critical event.
- */
- atomic_set(&ec->leaving_burst , 2); /* block current pending transaction
- and retry */
- wake_up(&ec->wait);
- }else {
- if ((ec->expect_event == ACPI_EC_EVENT_OBF &&
- (value & ACPI_EC_FLAG_OBF)) ||
- (ec->expect_event == ACPI_EC_EVENT_IBE &&
- !(value & ACPI_EC_FLAG_IBF))) {
- ec->expect_event = 0;
- wake_up(&ec->wait);
-
- }
- }
- if (value & ACPI_EC_FLAG_SCI){
- atomic_add(1, &ec->pending_gpe) ;
- status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
- acpi_ec_gpe_query, ec);
- }
- return status == AE_OK ?
- 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 bit_width,
- acpi_integer *value,
- void *handler_context,
- void *region_context)
- {
- int result = 0;
- struct acpi_ec *ec = NULL;
- u64 temp = *value;
- acpi_integer f_v = 0;
- int i = 0;
- ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
- if ((address > 0xFF) || !value || !handler_context)
- return_VALUE(AE_BAD_PARAMETER);
- if (bit_width != 8 && acpi_strict) {
- printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
- return_VALUE(AE_BAD_PARAMETER);
- }
- ec = (struct acpi_ec *) handler_context;
- next_byte:
- switch (function) {
- case ACPI_READ:
- temp = 0;
- result = acpi_ec_read(ec, (u8) address, (u32 *)&temp);
- break;
- case ACPI_WRITE:
- result = acpi_ec_write(ec, (u8) address, (u8) temp);
- break;
- default:
- result = -EINVAL;
- goto out;
- break;
- }
- bit_width -= 8;
- if (bit_width) {
- if (function == ACPI_READ)
- f_v |= temp << 8 * i;
- if (function == ACPI_WRITE)
- temp >>= 8;
- i++;
- (u8)address ++;
- goto next_byte;
- }
- if (function == ACPI_READ) {
- f_v |= temp << 8 * i;
- *value = f_v;
- }
-
- out:
- 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)
- -------------------------------------------------------------------------- */
- static struct proc_dir_entry *acpi_ec_dir;
- static int
- acpi_ec_read_info (struct seq_file *seq, void *offset)
- {
- struct acpi_ec *ec = (struct acpi_ec *) seq->private;
- ACPI_FUNCTION_TRACE("acpi_ec_read_info");
- if (!ec)
- goto end;
- seq_printf(seq, "gpe bit: 0x%02x\n",
- (u32) ec->gpe_bit);
- seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
- (u32) ec->status_addr.address, (u32) ec->data_addr.address);
- seq_printf(seq, "use global lock: %s\n",
- ec->global_lock?"yes":"no");
- end:
- 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 = {
- .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;
- 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_entry(ACPI_EC_FILE_INFO, S_IRUGO,
- acpi_device_dir(device));
- if (!entry)
- ACPI_DEBUG_PRINT((ACPI_DB_WARN,
- "Unable to create '%s' fs entry\n",
- ACPI_EC_FILE_INFO));
- else {
- entry->proc_fops = &acpi_ec_info_ops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
- return_VALUE(0);
- }
- static int
- acpi_ec_remove_fs (
- struct acpi_device *device)
- {
- 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
- -------------------------------------------------------------------------- */
- static int
- acpi_ec_add (
- struct acpi_device *device)
- {
- int result;
- acpi_status status;
- struct acpi_ec *ec;
- 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;
- atomic_set(&ec->pending_gpe, 0);
- atomic_set(&ec->leaving_burst , 1);
- init_MUTEX(&ec->sem);
- init_waitqueue_head(&ec->wait);
- 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? */
- 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;
- 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;
- struct acpi_ec *ec;
- 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);
- }
- acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
- acpi_enable_gpe (NULL, ec->gpe_bit, 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_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;
- struct acpi_ec *ec;
- 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);
- }
- static acpi_status __init
- acpi_fake_ecdt_callback (
- acpi_handle handle,
- u32 Level,
- void *context,
- void **retval)
- {
- acpi_status status;
- status = acpi_walk_resources(handle, METHOD_NAME__CRS,
- acpi_ec_io_ports, ec_ecdt);
- if (ACPI_FAILURE(status))
- return status;
- ec_ecdt->status_addr = ec_ecdt->command_addr;
- ec_ecdt->uid = -1;
- acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
- status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit);
- if (ACPI_FAILURE(status))
- return status;
- ec_ecdt->global_lock = TRUE;
- ec_ecdt->handle = handle;
- printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
- (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address,
- (u32) ec_ecdt->data_addr.address);
- 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.
- */
- static int __init
- acpi_ec_fake_ecdt(void)
- {
- acpi_status status;
- int ret = 0;
- printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
- ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
- if (!ec_ecdt) {
- ret = -ENOMEM;
- goto error;
- }
- memset(ec_ecdt, 0, sizeof(struct acpi_ec));
- status = acpi_get_devices (ACPI_EC_HID,
- acpi_fake_ecdt_callback,
- NULL,
- NULL);
- if (ACPI_FAILURE(status)) {
- kfree(ec_ecdt);
- ec_ecdt = NULL;
- ret = -ENODEV;
- goto error;
- }
- return 0;
- error:
- printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
- return ret;
- }
- static int __init
- acpi_ec_get_real_ecdt(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 -ENODEV;
- 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));
- init_MUTEX(&ec_ecdt->sem);
- init_waitqueue_head(&ec_ecdt->wait);
- 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;
- /* 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;
- }
- return 0;
- error:
- printk(KERN_ERR PREFIX "Could not use ECDT\n");
- kfree(ec_ecdt);
- ec_ecdt = NULL;
- return -ENODEV;
- }
- static int __initdata acpi_fake_ecdt_enabled;
- int __init
- acpi_ec_ecdt_probe (void)
- {
- acpi_status status;
- int ret;
- 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
- */
- 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;
- }
- acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
- acpi_enable_gpe (NULL, ec_ecdt->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);
- 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;
- }
- static int __init acpi_ec_init (void)
- {
- int result;
- 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
- static 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 */
- static int __init acpi_fake_ecdt_setup(char *str)
- {
- acpi_fake_ecdt_enabled = 1;
- return 0;
- }
- __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
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