2 * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/delay.h>
32 #include <linux/proc_fs.h>
33 #include <linux/seq_file.h>
34 #include <linux/interrupt.h>
36 #include <acpi/acpi_bus.h>
37 #include <acpi/acpi_drivers.h>
38 #include <acpi/actypes.h>
40 #define _COMPONENT ACPI_EC_COMPONENT
41 ACPI_MODULE_NAME ("acpi_ec")
43 #define ACPI_EC_COMPONENT 0x00100000
44 #define ACPI_EC_CLASS "embedded_controller"
45 #define ACPI_EC_HID "PNP0C09"
46 #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
47 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
48 #define ACPI_EC_FILE_INFO "info"
51 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
52 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
53 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
54 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
56 #define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
57 #define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
59 #define ACPI_EC_DELAY 50 /* Wait 50ms max. during EC ops */
60 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
62 #define ACPI_EC_COMMAND_READ 0x80
63 #define ACPI_EC_COMMAND_WRITE 0x81
64 #define ACPI_EC_BURST_ENABLE 0x82
65 #define ACPI_EC_BURST_DISABLE 0x83
66 #define ACPI_EC_COMMAND_QUERY 0x84
68 static int acpi_ec_add (struct acpi_device *device);
69 static int acpi_ec_remove (struct acpi_device *device, int type);
70 static int acpi_ec_start (struct acpi_device *device);
71 static int acpi_ec_stop (struct acpi_device *device, int type);
73 static struct acpi_driver acpi_ec_driver = {
74 .name = ACPI_EC_DRIVER_NAME,
75 .class = ACPI_EC_CLASS,
79 .remove = acpi_ec_remove,
80 .start = acpi_ec_start,
88 unsigned long gpe_bit;
89 struct acpi_generic_address status_addr;
90 struct acpi_generic_address command_addr;
91 struct acpi_generic_address data_addr;
92 unsigned long global_lock;
93 unsigned int expect_event;
94 atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort*/
97 wait_queue_head_t wait;
100 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
101 static struct acpi_ec *ec_ecdt;
103 /* External interfaces use first EC only, so remember */
104 static struct acpi_device *first_ec;
106 /* --------------------------------------------------------------------------
107 Transaction Management
108 -------------------------------------------------------------------------- */
110 static inline u32 acpi_ec_read_status(struct acpi_ec *ec)
114 acpi_hw_low_level_read(8, &status, &ec->status_addr);
118 static int acpi_ec_wait(struct acpi_ec *ec, unsigned int event)
122 ACPI_FUNCTION_TRACE("acpi_ec_wait");
124 ec->expect_event = event;
127 result = wait_event_interruptible_timeout(ec->wait,
129 msecs_to_jiffies(ACPI_EC_DELAY));
131 ec->expect_event = 0;
135 ACPI_DEBUG_PRINT((ACPI_DB_ERROR," result = %d ", result));
136 return_VALUE(result);
140 * Verify that the event in question has actually happened by
141 * querying EC status. Do the check even if operation timed-out
142 * to make sure that we did not miss interrupt.
145 case ACPI_EC_EVENT_OBF:
146 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_OBF)
150 case ACPI_EC_EVENT_IBE:
151 if (~acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF)
156 return_VALUE(-ETIME);
162 acpi_ec_enter_burst_mode (
168 ACPI_FUNCTION_TRACE("acpi_ec_enter_burst_mode");
170 status = acpi_ec_read_status(ec);
171 if (status != -EINVAL &&
172 !(status & ACPI_EC_FLAG_BURST)){
173 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"entering burst mode \n"));
174 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
175 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
177 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
178 ACPI_DEBUG_PRINT((ACPI_DB_ERROR," status = %d\n", status));
179 return_VALUE(-EINVAL);
181 acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
182 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
183 if(tmp != 0x90 ) {/* Burst ACK byte*/
184 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"Ack failed \n"));
185 return_VALUE(-EINVAL);
188 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in burst mode \n"));
189 atomic_set(&ec->leaving_burst , 0);
194 acpi_ec_leave_burst_mode (
199 ACPI_FUNCTION_TRACE("acpi_ec_leave_burst_mode");
201 atomic_set(&ec->leaving_burst , 1);
202 status = acpi_ec_read_status(ec);
203 if (status != -EINVAL &&
204 (status & ACPI_EC_FLAG_BURST)){
205 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n"));
206 acpi_hw_low_level_write(8, ACPI_EC_BURST_DISABLE, &ec->command_addr);
207 status = acpi_ec_wait(ec, ACPI_EC_FLAG_IBF);
209 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
210 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->wait fail\n"));
211 return_VALUE(-EINVAL);
213 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
214 status = acpi_ec_read_status(ec);
215 if (status != -EINVAL &&
216 (status & ACPI_EC_FLAG_BURST)) {
217 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,"------->status fail\n"));
218 return_VALUE(-EINVAL);
221 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"already be in Non-burst mode \n"));
222 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"leaving burst mode\n"));
236 ACPI_FUNCTION_TRACE("acpi_ec_read");
239 return_VALUE(-EINVAL);
244 if (ec->global_lock) {
245 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
246 if (ACPI_FAILURE(status))
247 return_VALUE(-ENODEV);
250 WARN_ON(in_interrupt());
253 if(acpi_ec_enter_burst_mode(ec))
256 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
257 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
258 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
263 acpi_hw_low_level_write(8, address, &ec->data_addr);
264 status= acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
266 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
270 acpi_hw_low_level_read(8, data, &ec->data_addr);
271 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
273 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
277 acpi_ec_leave_burst_mode(ec);
281 acpi_release_global_lock(glk);
283 if(atomic_read(&ec->leaving_burst) == 2){
284 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
285 while(atomic_read(&ec->pending_gpe)){
288 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
292 return_VALUE(status);
306 ACPI_FUNCTION_TRACE("acpi_ec_write");
309 return_VALUE(-EINVAL);
311 if (ec->global_lock) {
312 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
313 if (ACPI_FAILURE(status))
314 return_VALUE(-ENODEV);
317 WARN_ON(in_interrupt());
320 if(acpi_ec_enter_burst_mode(ec))
323 status = acpi_ec_read_status(ec);
324 if (status != -EINVAL &&
325 !(status & ACPI_EC_FLAG_BURST)){
326 acpi_hw_low_level_write(8, ACPI_EC_BURST_ENABLE, &ec->command_addr);
327 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
330 acpi_hw_low_level_read(8, &tmp, &ec->data_addr);
331 if(tmp != 0x90 ) /* Burst ACK byte*/
334 /*Now we are in burst mode*/
336 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
337 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
338 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
343 acpi_hw_low_level_write(8, address, &ec->data_addr);
344 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
346 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
350 acpi_hw_low_level_write(8, data, &ec->data_addr);
351 status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
352 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
356 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
360 acpi_ec_leave_burst_mode(ec);
364 acpi_release_global_lock(glk);
366 if(atomic_read(&ec->leaving_burst) == 2){
367 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
368 while(atomic_read(&ec->pending_gpe)){
371 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
375 return_VALUE(status);
379 * Externally callable EC access functions. For now, assume 1 EC only
382 ec_read(u8 addr, u8 *val)
391 ec = acpi_driver_data(first_ec);
393 err = acpi_ec_read(ec, addr, &temp_data);
402 EXPORT_SYMBOL(ec_read);
405 ec_write(u8 addr, u8 val)
413 ec = acpi_driver_data(first_ec);
415 err = acpi_ec_write(ec, addr, val);
419 EXPORT_SYMBOL(ec_write);
430 ACPI_FUNCTION_TRACE("acpi_ec_query");
433 return_VALUE(-EINVAL);
436 if (ec->global_lock) {
437 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
438 if (ACPI_FAILURE(status))
439 return_VALUE(-ENODEV);
443 if(acpi_ec_enter_burst_mode(ec))
446 * Query the EC to find out which _Qxx method we need to evaluate.
447 * Note that successful completion of the query causes the ACPI_EC_SCI
448 * bit to be cleared (and thus clearing the interrupt source).
450 acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
451 status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
453 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
457 acpi_hw_low_level_read(8, data, &ec->data_addr);
458 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
463 acpi_ec_leave_burst_mode(ec);
467 acpi_release_global_lock(glk);
469 if(atomic_read(&ec->leaving_burst) == 2){
470 ACPI_DEBUG_PRINT((ACPI_DB_INFO,"aborted, retry ...\n"));
471 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
474 return_VALUE(status);
478 /* --------------------------------------------------------------------------
480 -------------------------------------------------------------------------- */
482 struct acpi_ec_query_data {
491 struct acpi_ec *ec = (struct acpi_ec *) ec_cxt;
493 int result = -ENODATA;
494 static char object_name[5] = {'_','Q','0','0','\0'};
495 const char hex[] = {'0','1','2','3','4','5','6','7',
496 '8','9','A','B','C','D','E','F'};
498 ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
500 if (acpi_ec_read_status(ec) & ACPI_EC_FLAG_SCI)
501 result = acpi_ec_query(ec, &value);
506 object_name[2] = hex[((value >> 4) & 0x0F)];
507 object_name[3] = hex[(value & 0x0F)];
509 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", object_name));
511 acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
513 atomic_dec(&ec->pending_gpe);
518 acpi_ec_gpe_handler (
521 acpi_status status = AE_OK;
523 struct acpi_ec *ec = (struct acpi_ec *) data;
526 return ACPI_INTERRUPT_NOT_HANDLED;
528 acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
530 value = acpi_ec_read_status(ec);
532 if((value & ACPI_EC_FLAG_IBF) &&
533 !(value & ACPI_EC_FLAG_BURST) &&
534 (atomic_read(&ec->leaving_burst) == 0)) {
536 * the embedded controller disables
537 * burst mode for any reason other
538 * than the burst disable command
539 * to process critical event.
541 atomic_set(&ec->leaving_burst , 2); /* block current pending transaction
545 if ((ec->expect_event == ACPI_EC_EVENT_OBF &&
546 (value & ACPI_EC_FLAG_OBF)) ||
547 (ec->expect_event == ACPI_EC_EVENT_IBE &&
548 !(value & ACPI_EC_FLAG_IBF))) {
549 ec->expect_event = 0;
551 return ACPI_INTERRUPT_HANDLED;
555 if (value & ACPI_EC_FLAG_SCI){
556 atomic_add(1, &ec->pending_gpe) ;
557 status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
558 acpi_ec_gpe_query, ec);
559 return status == AE_OK ?
560 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
562 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
563 return status == AE_OK ?
564 ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
567 /* --------------------------------------------------------------------------
568 Address Space Management
569 -------------------------------------------------------------------------- */
572 acpi_ec_space_setup (
573 acpi_handle region_handle,
575 void *handler_context,
576 void **return_context)
579 * The EC object is in the handler context and is needed
580 * when calling the acpi_ec_space_handler.
582 *return_context = (function != ACPI_REGION_DEACTIVATE) ?
583 handler_context : NULL;
590 acpi_ec_space_handler (
592 acpi_physical_address address,
595 void *handler_context,
596 void *region_context)
599 struct acpi_ec *ec = NULL;
601 acpi_integer f_v = 0;
604 ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
606 if ((address > 0xFF) || !value || !handler_context)
607 return_VALUE(AE_BAD_PARAMETER);
609 if (bit_width != 8 && acpi_strict) {
610 printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
611 return_VALUE(AE_BAD_PARAMETER);
614 ec = (struct acpi_ec *) handler_context;
620 result = acpi_ec_read(ec, (u8) address, (u32 *)&temp);
623 result = acpi_ec_write(ec, (u8) address, (u8) temp);
633 if (function == ACPI_READ)
634 f_v |= temp << 8 * i;
635 if (function == ACPI_WRITE)
642 if (function == ACPI_READ) {
643 f_v |= temp << 8 * i;
651 return_VALUE(AE_BAD_PARAMETER);
654 return_VALUE(AE_NOT_FOUND);
657 return_VALUE(AE_TIME);
665 /* --------------------------------------------------------------------------
667 -------------------------------------------------------------------------- */
669 static struct proc_dir_entry *acpi_ec_dir;
673 acpi_ec_read_info (struct seq_file *seq, void *offset)
675 struct acpi_ec *ec = (struct acpi_ec *) seq->private;
677 ACPI_FUNCTION_TRACE("acpi_ec_read_info");
682 seq_printf(seq, "gpe bit: 0x%02x\n",
684 seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
685 (u32) ec->status_addr.address, (u32) ec->data_addr.address);
686 seq_printf(seq, "use global lock: %s\n",
687 ec->global_lock?"yes":"no");
688 acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
694 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
696 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
699 static struct file_operations acpi_ec_info_ops = {
700 .open = acpi_ec_info_open_fs,
703 .release = single_release,
704 .owner = THIS_MODULE,
709 struct acpi_device *device)
711 struct proc_dir_entry *entry;
713 ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
715 if (!acpi_device_dir(device)) {
716 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
718 if (!acpi_device_dir(device))
719 return_VALUE(-ENODEV);
722 entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
723 acpi_device_dir(device));
725 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
726 "Unable to create '%s' fs entry\n",
729 entry->proc_fops = &acpi_ec_info_ops;
730 entry->data = acpi_driver_data(device);
731 entry->owner = THIS_MODULE;
740 struct acpi_device *device)
742 ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
744 if (acpi_device_dir(device)) {
745 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
746 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
747 acpi_device_dir(device) = NULL;
754 /* --------------------------------------------------------------------------
756 -------------------------------------------------------------------------- */
760 struct acpi_device *device)
767 ACPI_FUNCTION_TRACE("acpi_ec_add");
770 return_VALUE(-EINVAL);
772 ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
774 return_VALUE(-ENOMEM);
775 memset(ec, 0, sizeof(struct acpi_ec));
777 ec->handle = device->handle;
779 atomic_set(&ec->pending_gpe, 0);
780 atomic_set(&ec->leaving_burst , 1);
781 init_MUTEX(&ec->sem);
782 init_waitqueue_head(&ec->wait);
783 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
784 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
785 acpi_driver_data(device) = ec;
787 /* Use the global lock for all EC transactions? */
788 acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock);
790 /* If our UID matches the UID for the ECDT-enumerated EC,
791 we now have the *real* EC info, so kill the makeshift one.*/
792 acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid);
793 if (ec_ecdt && ec_ecdt->uid == uid) {
794 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
795 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
797 acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit, &acpi_ec_gpe_handler);
802 /* Get GPE bit assignment (EC events). */
803 /* TODO: Add support for _GPE returning a package */
804 status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe_bit);
805 if (ACPI_FAILURE(status)) {
806 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
807 "Error obtaining GPE bit assignment\n"));
812 result = acpi_ec_add_fs(device);
816 printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
817 acpi_device_name(device), acpi_device_bid(device),
827 return_VALUE(result);
833 struct acpi_device *device,
838 ACPI_FUNCTION_TRACE("acpi_ec_remove");
841 return_VALUE(-EINVAL);
843 ec = acpi_driver_data(device);
845 acpi_ec_remove_fs(device);
855 struct acpi_resource *resource,
858 struct acpi_ec *ec = (struct acpi_ec *) context;
859 struct acpi_generic_address *addr;
861 if (resource->id != ACPI_RSTYPE_IO) {
866 * The first address region returned is the data port, and
867 * the second address region returned is the status/command
870 if (ec->data_addr.register_bit_width == 0) {
871 addr = &ec->data_addr;
872 } else if (ec->command_addr.register_bit_width == 0) {
873 addr = &ec->command_addr;
875 return AE_CTRL_TERMINATE;
878 addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
879 addr->register_bit_width = 8;
880 addr->register_bit_offset = 0;
881 addr->address = resource->data.io.min_base_address;
889 struct acpi_device *device)
894 ACPI_FUNCTION_TRACE("acpi_ec_start");
897 return_VALUE(-EINVAL);
899 ec = acpi_driver_data(device);
902 return_VALUE(-EINVAL);
905 * Get I/O port addresses. Convert to GAS format.
907 status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
908 acpi_ec_io_ports, ec);
909 if (ACPI_FAILURE(status) || ec->command_addr.register_bit_width == 0) {
910 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
911 return_VALUE(-ENODEV);
914 ec->status_addr = ec->command_addr;
916 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
917 (u32) ec->gpe_bit, (u32) ec->command_addr.address,
918 (u32) ec->data_addr.address));
921 * Install GPE handler
923 status = acpi_install_gpe_handler(NULL, ec->gpe_bit,
924 ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec);
925 if (ACPI_FAILURE(status)) {
926 return_VALUE(-ENODEV);
928 acpi_set_gpe_type (NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
929 acpi_enable_gpe (NULL, ec->gpe_bit, ACPI_NOT_ISR);
931 status = acpi_install_address_space_handler (ec->handle,
932 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
933 &acpi_ec_space_setup, ec);
934 if (ACPI_FAILURE(status)) {
935 acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
936 return_VALUE(-ENODEV);
945 struct acpi_device *device,
951 ACPI_FUNCTION_TRACE("acpi_ec_stop");
954 return_VALUE(-EINVAL);
956 ec = acpi_driver_data(device);
958 status = acpi_remove_address_space_handler(ec->handle,
959 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler);
960 if (ACPI_FAILURE(status))
961 return_VALUE(-ENODEV);
963 status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
964 if (ACPI_FAILURE(status))
965 return_VALUE(-ENODEV);
970 static acpi_status __init
971 acpi_fake_ecdt_callback (
979 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
980 acpi_ec_io_ports, ec_ecdt);
981 if (ACPI_FAILURE(status))
983 ec_ecdt->status_addr = ec_ecdt->command_addr;
986 acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
988 status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit);
989 if (ACPI_FAILURE(status))
991 ec_ecdt->global_lock = TRUE;
992 ec_ecdt->handle = handle;
994 printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
995 (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address,
996 (u32) ec_ecdt->data_addr.address);
998 return AE_CTRL_TERMINATE;
1002 * Some BIOS (such as some from Gateway laptops) access EC region very early
1003 * such as in BAT0._INI or EC._INI before an EC device is found and
1004 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
1005 * required, but if EC regison is accessed early, it is required.
1006 * The routine tries to workaround the BIOS bug by pre-scan EC device
1007 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
1008 * op region (since _REG isn't invoked yet). The assumption is true for
1009 * all systems found.
1012 acpi_ec_fake_ecdt(void)
1017 printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
1019 ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
1024 memset(ec_ecdt, 0, sizeof(struct acpi_ec));
1026 status = acpi_get_devices (ACPI_EC_HID,
1027 acpi_fake_ecdt_callback,
1030 if (ACPI_FAILURE(status)) {
1038 printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
1043 acpi_ec_get_real_ecdt(void)
1046 struct acpi_table_ecdt *ecdt_ptr;
1048 status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
1049 (struct acpi_table_header **) &ecdt_ptr);
1050 if (ACPI_FAILURE(status))
1053 printk(KERN_INFO PREFIX "Found ECDT\n");
1056 * Generate a temporary ec context to use until the namespace is scanned
1058 ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
1061 memset(ec_ecdt, 0, sizeof(struct acpi_ec));
1063 init_MUTEX(&ec_ecdt->sem);
1064 init_waitqueue_head(&ec_ecdt->wait);
1065 ec_ecdt->command_addr = ecdt_ptr->ec_control;
1066 ec_ecdt->status_addr = ecdt_ptr->ec_control;
1067 ec_ecdt->data_addr = ecdt_ptr->ec_data;
1068 ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
1069 /* use the GL just to be safe */
1070 ec_ecdt->global_lock = TRUE;
1071 ec_ecdt->uid = ecdt_ptr->uid;
1073 status = acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
1074 if (ACPI_FAILURE(status)) {
1080 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1087 static int __initdata acpi_fake_ecdt_enabled;
1089 acpi_ec_ecdt_probe (void)
1094 ret = acpi_ec_get_real_ecdt();
1095 /* Try to make a fake ECDT */
1096 if (ret && acpi_fake_ecdt_enabled) {
1097 ret = acpi_ec_fake_ecdt();
1104 * Install GPE handler
1106 status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit,
1107 ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler,
1109 if (ACPI_FAILURE(status)) {
1112 acpi_set_gpe_type (NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
1113 acpi_enable_gpe (NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR);
1115 status = acpi_install_address_space_handler (ACPI_ROOT_OBJECT,
1116 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler,
1117 &acpi_ec_space_setup, ec_ecdt);
1118 if (ACPI_FAILURE(status)) {
1119 acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit,
1120 &acpi_ec_gpe_handler);
1127 printk(KERN_ERR PREFIX "Could not use ECDT\n");
1135 static int __init acpi_ec_init (void)
1139 ACPI_FUNCTION_TRACE("acpi_ec_init");
1144 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1146 return_VALUE(-ENODEV);
1148 /* Now register the driver for the EC */
1149 result = acpi_bus_register_driver(&acpi_ec_driver);
1151 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1152 return_VALUE(-ENODEV);
1155 return_VALUE(result);
1158 subsys_initcall(acpi_ec_init);
1160 /* EC driver currently not unloadable */
1165 ACPI_FUNCTION_TRACE("acpi_ec_exit");
1167 acpi_bus_unregister_driver(&acpi_ec_driver);
1169 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1175 static int __init acpi_fake_ecdt_setup(char *str)
1177 acpi_fake_ecdt_enabled = 1;
1180 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);