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")
42 #define ACPI_EC_COMPONENT 0x00100000
43 #define ACPI_EC_CLASS "embedded_controller"
44 #define ACPI_EC_HID "PNP0C09"
45 #define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
46 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
47 #define ACPI_EC_FILE_INFO "info"
50 #define PREFIX "ACPI: EC: "
52 /* EC status register */
53 #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
54 #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
55 #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */
56 #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
59 #define ACPI_EC_COMMAND_READ 0x80
60 #define ACPI_EC_COMMAND_WRITE 0x81
61 #define ACPI_EC_BURST_ENABLE 0x82
62 #define ACPI_EC_BURST_DISABLE 0x83
63 #define ACPI_EC_COMMAND_QUERY 0x84
67 ACPI_EC_EVENT_OBF_1
= 1, /* Output buffer full */
68 ACPI_EC_EVENT_IBF_0
, /* Input buffer empty */
71 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
72 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
73 #define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */
74 #define ACPI_EC_UDELAY_COUNT 1000 /* Wait 100ms max. during EC ops */
77 EC_INTR
= 1, /* Output buffer full */
78 EC_POLL
, /* Input buffer empty */
81 static int acpi_ec_remove(struct acpi_device
*device
, int type
);
82 static int acpi_ec_start(struct acpi_device
*device
);
83 static int acpi_ec_stop(struct acpi_device
*device
, int type
);
84 static int acpi_ec_add(struct acpi_device
*device
);
86 static struct acpi_driver acpi_ec_driver
= {
87 .name
= ACPI_EC_DRIVER_NAME
,
88 .class = ACPI_EC_CLASS
,
92 .remove
= acpi_ec_remove
,
93 .start
= acpi_ec_start
,
98 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
103 unsigned long command_addr
;
104 unsigned long data_addr
;
105 unsigned long global_lock
;
107 atomic_t query_pending
;
108 atomic_t leaving_burst
; /* 0 : No, 1 : Yes, 2: abort */
109 wait_queue_head_t wait
;
112 /* External interfaces use first EC only, so remember */
113 static struct acpi_device
*first_ec
;
114 static int acpi_ec_mode
= EC_INTR
;
116 /* --------------------------------------------------------------------------
117 Transaction Management
118 -------------------------------------------------------------------------- */
120 static inline u8
acpi_ec_read_status(struct acpi_ec
*ec
)
122 return inb(ec
->command_addr
);
125 static inline u8
acpi_ec_read_data(struct acpi_ec
*ec
)
127 return inb(ec
->data_addr
);
130 static inline void acpi_ec_write_cmd(struct acpi_ec
*ec
, u8 command
)
132 outb(command
, ec
->command_addr
);
135 static inline void acpi_ec_write_data(struct acpi_ec
*ec
, u8 data
)
137 outb(data
, ec
->data_addr
);
140 static int acpi_ec_check_status(struct acpi_ec
*ec
, u8 event
)
142 u8 status
= acpi_ec_read_status(ec
);
144 case ACPI_EC_EVENT_OBF_1
:
145 if (status
& ACPI_EC_FLAG_OBF
)
148 case ACPI_EC_EVENT_IBF_0
:
149 if (!(status
& ACPI_EC_FLAG_IBF
))
159 static int acpi_ec_wait(struct acpi_ec
*ec
, u8 event
)
161 if (acpi_ec_mode
== EC_POLL
) {
163 for (i
= 0; i
< ACPI_EC_UDELAY_COUNT
; ++i
) {
164 if (acpi_ec_check_status(ec
, event
))
166 udelay(ACPI_EC_UDELAY
);
169 if (wait_event_timeout(ec
->wait
,
170 acpi_ec_check_status(ec
, event
),
171 msecs_to_jiffies(ACPI_EC_DELAY
)) ||
172 acpi_ec_check_status(ec
, event
)) {
175 printk(KERN_ERR PREFIX
"acpi_ec_wait timeout,"
176 " status = %d, expect_event = %d\n",
177 acpi_ec_read_status(ec
), event
);
184 #ifdef ACPI_FUTURE_USAGE
186 * Note: samsung nv5000 doesn't work with ec burst mode.
187 * http://bugzilla.kernel.org/show_bug.cgi?id=4980
189 int acpi_ec_enter_burst_mode(struct acpi_ec
*ec
)
195 status
= acpi_ec_read_status(ec
);
196 if (status
!= -EINVAL
&& !(status
& ACPI_EC_FLAG_BURST
)) {
197 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
);
200 acpi_ec_write_cmd(ec
, ACPI_EC_BURST_ENABLE
);
201 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF_1
);
202 tmp
= acpi_ec_read_data(ec
);
203 if (tmp
!= 0x90) { /* Burst ACK byte */
208 atomic_set(&ec
->leaving_burst
, 0);
211 ACPI_EXCEPTION((AE_INFO
, status
, "EC wait, burst mode"));
215 int acpi_ec_leave_burst_mode(struct acpi_ec
*ec
)
220 status
= acpi_ec_read_status(ec
);
221 if (status
!= -EINVAL
&& (status
& ACPI_EC_FLAG_BURST
)){
222 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
);
225 acpi_ec_write_cmd(ec
, ACPI_EC_BURST_DISABLE
);
226 acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
);
228 atomic_set(&ec
->leaving_burst
, 1);
231 ACPI_EXCEPTION((AE_INFO
, status
, "EC leave burst mode"));
234 #endif /* ACPI_FUTURE_USAGE */
236 static int acpi_ec_transaction_unlocked(struct acpi_ec
*ec
, u8 command
,
237 const u8
*wdata
, unsigned wdata_len
,
238 u8
*rdata
, unsigned rdata_len
)
242 acpi_ec_write_cmd(ec
, command
);
244 for (; wdata_len
> 0; wdata_len
--) {
245 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
);
247 printk(KERN_ERR PREFIX
"write_cmd timeout, command = %d\n",
251 acpi_ec_write_data(ec
, *(wdata
++));
255 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
);
257 printk(KERN_ERR PREFIX
"finish-write timeout, command = %d\n",
261 } else if (command
== ACPI_EC_COMMAND_QUERY
) {
262 atomic_set(&ec
->query_pending
, 0);
265 for (; rdata_len
> 0; rdata_len
--) {
266 result
= acpi_ec_wait(ec
, ACPI_EC_EVENT_OBF_1
);
268 printk(KERN_ERR PREFIX
"read timeout, command = %d\n",
273 *(rdata
++) = acpi_ec_read_data(ec
);
279 static int acpi_ec_transaction(struct acpi_ec
*ec
, u8 command
,
280 const u8
*wdata
, unsigned wdata_len
,
281 u8
*rdata
, unsigned rdata_len
)
286 if (!ec
|| (wdata_len
&& !wdata
) || (rdata_len
&& !rdata
))
290 memset(rdata
, 0, rdata_len
);
292 if (ec
->global_lock
) {
293 status
= acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK
, &glk
);
294 if (ACPI_FAILURE(status
))
297 mutex_lock(&ec
->lock
);
299 /* Make sure GPE is enabled before doing transaction */
300 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
302 status
= acpi_ec_wait(ec
, ACPI_EC_EVENT_IBF_0
);
304 printk(KERN_DEBUG PREFIX
"read EC, IB not empty\n");
308 status
= acpi_ec_transaction_unlocked(ec
, command
,
313 mutex_unlock(&ec
->lock
);
316 acpi_release_global_lock(glk
);
321 static int acpi_ec_read(struct acpi_ec
*ec
, u8 address
, u8
*data
)
326 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_READ
,
332 static int acpi_ec_write(struct acpi_ec
*ec
, u8 address
, u8 data
)
334 u8 wdata
[2] = { address
, data
};
335 return acpi_ec_transaction(ec
, ACPI_EC_COMMAND_WRITE
,
340 * Externally callable EC access functions. For now, assume 1 EC only
342 int ec_read(u8 addr
, u8
*val
)
351 ec
= acpi_driver_data(first_ec
);
353 err
= acpi_ec_read(ec
, addr
, &temp_data
);
362 EXPORT_SYMBOL(ec_read
);
364 int ec_write(u8 addr
, u8 val
)
372 ec
= acpi_driver_data(first_ec
);
374 err
= acpi_ec_write(ec
, addr
, val
);
379 EXPORT_SYMBOL(ec_write
);
381 extern int ec_transaction(u8 command
,
382 const u8
*wdata
, unsigned wdata_len
,
383 u8
*rdata
, unsigned rdata_len
)
390 ec
= acpi_driver_data(first_ec
);
392 return acpi_ec_transaction(ec
, command
, wdata
,
393 wdata_len
, rdata
, rdata_len
);
396 EXPORT_SYMBOL(ec_transaction
);
398 static int acpi_ec_query(struct acpi_ec
*ec
, u8
*data
)
407 * Query the EC to find out which _Qxx method we need to evaluate.
408 * Note that successful completion of the query causes the ACPI_EC_SCI
409 * bit to be cleared (and thus clearing the interrupt source).
412 result
= acpi_ec_transaction(ec
, ACPI_EC_COMMAND_QUERY
, NULL
, 0, &d
, 1);
423 /* --------------------------------------------------------------------------
425 -------------------------------------------------------------------------- */
427 static void acpi_ec_gpe_query(void *ec_cxt
)
429 struct acpi_ec
*ec
= (struct acpi_ec
*)ec_cxt
;
433 if (!ec
|| acpi_ec_query(ec
, &value
))
436 snprintf(object_name
, 8, "_Q%2.2X", value
);
438 printk(KERN_INFO PREFIX
"evaluating %s\n", object_name
);
440 acpi_evaluate_object(ec
->handle
, object_name
, NULL
, NULL
);
443 static u32
acpi_ec_gpe_handler(void *data
)
445 acpi_status status
= AE_OK
;
447 struct acpi_ec
*ec
= (struct acpi_ec
*)data
;
450 if (acpi_ec_mode
== EC_INTR
) {
454 value
= acpi_ec_read_status(ec
);
455 if ((value
& ACPI_EC_FLAG_SCI
) && !atomic_read(&ec
->query_pending
)) {
456 atomic_set(&ec
->query_pending
, 1);
457 status
= acpi_os_execute(OSL_EC_BURST_HANDLER
, acpi_ec_gpe_query
, ec
);
460 return status
== AE_OK
?
461 ACPI_INTERRUPT_HANDLED
: ACPI_INTERRUPT_NOT_HANDLED
;
464 /* --------------------------------------------------------------------------
465 Address Space Management
466 -------------------------------------------------------------------------- */
469 acpi_ec_space_setup(acpi_handle region_handle
,
470 u32 function
, void *handler_context
, void **return_context
)
473 * The EC object is in the handler context and is needed
474 * when calling the acpi_ec_space_handler.
476 *return_context
= (function
!= ACPI_REGION_DEACTIVATE
) ?
477 handler_context
: NULL
;
483 acpi_ec_space_handler(u32 function
,
484 acpi_physical_address address
,
486 acpi_integer
* value
,
487 void *handler_context
, void *region_context
)
490 struct acpi_ec
*ec
= NULL
;
492 acpi_integer f_v
= 0;
496 if ((address
> 0xFF) || !value
|| !handler_context
)
497 return AE_BAD_PARAMETER
;
499 if (bit_width
!= 8 && acpi_strict
) {
500 return AE_BAD_PARAMETER
;
503 ec
= (struct acpi_ec
*)handler_context
;
509 result
= acpi_ec_read(ec
, (u8
) address
, (u8
*) &temp
);
512 result
= acpi_ec_write(ec
, (u8
) address
, (u8
) temp
);
522 if (function
== ACPI_READ
)
523 f_v
|= temp
<< 8 * i
;
524 if (function
== ACPI_WRITE
)
531 if (function
== ACPI_READ
) {
532 f_v
|= temp
<< 8 * i
;
539 return AE_BAD_PARAMETER
;
552 /* --------------------------------------------------------------------------
554 -------------------------------------------------------------------------- */
556 static struct proc_dir_entry
*acpi_ec_dir
;
558 static int acpi_ec_read_info(struct seq_file
*seq
, void *offset
)
560 struct acpi_ec
*ec
= (struct acpi_ec
*)seq
->private;
566 seq_printf(seq
, "gpe: 0x%02x\n",
568 seq_printf(seq
, "ports: 0x%02x, 0x%02x\n",
569 (u32
) ec
->command_addr
,
570 (u32
) ec
->data_addr
);
571 seq_printf(seq
, "use global lock: %s\n",
572 ec
->global_lock
? "yes" : "no");
573 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
579 static int acpi_ec_info_open_fs(struct inode
*inode
, struct file
*file
)
581 return single_open(file
, acpi_ec_read_info
, PDE(inode
)->data
);
584 static struct file_operations acpi_ec_info_ops
= {
585 .open
= acpi_ec_info_open_fs
,
588 .release
= single_release
,
589 .owner
= THIS_MODULE
,
592 static int acpi_ec_add_fs(struct acpi_device
*device
)
594 struct proc_dir_entry
*entry
= NULL
;
597 if (!acpi_device_dir(device
)) {
598 acpi_device_dir(device
) = proc_mkdir(acpi_device_bid(device
),
600 if (!acpi_device_dir(device
))
604 entry
= create_proc_entry(ACPI_EC_FILE_INFO
, S_IRUGO
,
605 acpi_device_dir(device
));
609 entry
->proc_fops
= &acpi_ec_info_ops
;
610 entry
->data
= acpi_driver_data(device
);
611 entry
->owner
= THIS_MODULE
;
617 static int acpi_ec_remove_fs(struct acpi_device
*device
)
620 if (acpi_device_dir(device
)) {
621 remove_proc_entry(ACPI_EC_FILE_INFO
, acpi_device_dir(device
));
622 remove_proc_entry(acpi_device_bid(device
), acpi_ec_dir
);
623 acpi_device_dir(device
) = NULL
;
629 /* --------------------------------------------------------------------------
631 -------------------------------------------------------------------------- */
633 static int acpi_ec_add(struct acpi_device
*device
)
636 acpi_status status
= AE_OK
;
637 struct acpi_ec
*ec
= NULL
;
643 ec
= kmalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
646 memset(ec
, 0, sizeof(struct acpi_ec
));
648 ec
->handle
= device
->handle
;
650 mutex_init(&ec
->lock
);
651 atomic_set(&ec
->query_pending
, 0);
652 if (acpi_ec_mode
== EC_INTR
) {
653 atomic_set(&ec
->leaving_burst
, 1);
654 init_waitqueue_head(&ec
->wait
);
656 strcpy(acpi_device_name(device
), ACPI_EC_DEVICE_NAME
);
657 strcpy(acpi_device_class(device
), ACPI_EC_CLASS
);
658 acpi_driver_data(device
) = ec
;
660 /* Use the global lock for all EC transactions? */
661 acpi_evaluate_integer(ec
->handle
, "_GLK", NULL
,
664 /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
665 http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
667 acpi_remove_address_space_handler(ACPI_ROOT_OBJECT
,
669 &acpi_ec_space_handler
);
671 acpi_remove_gpe_handler(NULL
, ec_ecdt
->gpe
,
672 &acpi_ec_gpe_handler
);
677 /* Get GPE bit assignment (EC events). */
678 /* TODO: Add support for _GPE returning a package */
680 acpi_evaluate_integer(ec
->handle
, "_GPE", NULL
,
682 if (ACPI_FAILURE(status
)) {
683 ACPI_EXCEPTION((AE_INFO
, status
, "Obtaining GPE bit assignment"));
688 result
= acpi_ec_add_fs(device
);
692 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "%s [%s] (gpe %d) interrupt mode.",
693 acpi_device_name(device
), acpi_device_bid(device
),
706 static int acpi_ec_remove(struct acpi_device
*device
, int type
)
708 struct acpi_ec
*ec
= NULL
;
714 ec
= acpi_driver_data(device
);
716 acpi_ec_remove_fs(device
);
724 acpi_ec_io_ports(struct acpi_resource
*resource
, void *context
)
726 struct acpi_ec
*ec
= (struct acpi_ec
*)context
;
728 if (resource
->type
!= ACPI_RESOURCE_TYPE_IO
) {
733 * The first address region returned is the data port, and
734 * the second address region returned is the status/command
737 if (ec
->data_addr
== 0) {
738 ec
->data_addr
= resource
->data
.io
.minimum
;
739 } else if (ec
->command_addr
== 0) {
740 ec
->command_addr
= resource
->data
.io
.minimum
;
742 return AE_CTRL_TERMINATE
;
748 static int acpi_ec_start(struct acpi_device
*device
)
750 acpi_status status
= AE_OK
;
751 struct acpi_ec
*ec
= NULL
;
757 ec
= acpi_driver_data(device
);
763 * Get I/O port addresses. Convert to GAS format.
765 status
= acpi_walk_resources(ec
->handle
, METHOD_NAME__CRS
,
766 acpi_ec_io_ports
, ec
);
767 if (ACPI_FAILURE(status
) || ec
->command_addr
== 0) {
768 ACPI_EXCEPTION((AE_INFO
, status
,
769 "Error getting I/O port addresses"));
773 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "gpe=0x%02lx, ports=0x%2lx,0x%2lx",
774 ec
->gpe
, ec
->command_addr
, ec
->data_addr
));
777 * Install GPE handler
779 status
= acpi_install_gpe_handler(NULL
, ec
->gpe
,
780 ACPI_GPE_EDGE_TRIGGERED
,
781 &acpi_ec_gpe_handler
, ec
);
782 if (ACPI_FAILURE(status
)) {
785 acpi_set_gpe_type(NULL
, ec
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
786 acpi_enable_gpe(NULL
, ec
->gpe
, ACPI_NOT_ISR
);
788 status
= acpi_install_address_space_handler(ec
->handle
,
790 &acpi_ec_space_handler
,
791 &acpi_ec_space_setup
, ec
);
792 if (ACPI_FAILURE(status
)) {
793 acpi_remove_gpe_handler(NULL
, ec
->gpe
,
794 &acpi_ec_gpe_handler
);
801 static int acpi_ec_stop(struct acpi_device
*device
, int type
)
803 acpi_status status
= AE_OK
;
804 struct acpi_ec
*ec
= NULL
;
810 ec
= acpi_driver_data(device
);
812 status
= acpi_remove_address_space_handler(ec
->handle
,
814 &acpi_ec_space_handler
);
815 if (ACPI_FAILURE(status
))
819 acpi_remove_gpe_handler(NULL
, ec
->gpe
,
820 &acpi_ec_gpe_handler
);
821 if (ACPI_FAILURE(status
))
827 static acpi_status __init
828 acpi_fake_ecdt_callback(acpi_handle handle
,
829 u32 Level
, void *context
, void **retval
)
833 mutex_init(&ec_ecdt
->lock
);
834 if (acpi_ec_mode
== EC_INTR
) {
835 init_waitqueue_head(&ec_ecdt
->wait
);
837 status
= acpi_walk_resources(handle
, METHOD_NAME__CRS
,
838 acpi_ec_io_ports
, ec_ecdt
);
839 if (ACPI_FAILURE(status
))
843 acpi_evaluate_integer(handle
, "_UID", NULL
, &ec_ecdt
->uid
);
846 acpi_evaluate_integer(handle
, "_GPE", NULL
,
848 if (ACPI_FAILURE(status
))
850 ec_ecdt
->global_lock
= TRUE
;
851 ec_ecdt
->handle
= handle
;
853 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
854 ec_ecdt
->gpe
, ec_ecdt
->command_addr
, ec_ecdt
->data_addr
));
856 return AE_CTRL_TERMINATE
;
860 * Some BIOS (such as some from Gateway laptops) access EC region very early
861 * such as in BAT0._INI or EC._INI before an EC device is found and
862 * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
863 * required, but if EC regison is accessed early, it is required.
864 * The routine tries to workaround the BIOS bug by pre-scan EC device
865 * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
866 * op region (since _REG isn't invoked yet). The assumption is true for
869 static int __init
acpi_ec_fake_ecdt(void)
874 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Try to make an fake ECDT"));
876 ec_ecdt
= kmalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
881 memset(ec_ecdt
, 0, sizeof(struct acpi_ec
));
883 status
= acpi_get_devices(ACPI_EC_HID
,
884 acpi_fake_ecdt_callback
, NULL
, NULL
);
885 if (ACPI_FAILURE(status
)) {
889 ACPI_EXCEPTION((AE_INFO
, status
, "Can't make an fake ECDT"));
897 static int __init
acpi_ec_get_real_ecdt(void)
900 struct acpi_table_ecdt
*ecdt_ptr
;
902 status
= acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING
,
903 (struct acpi_table_header
**)
905 if (ACPI_FAILURE(status
))
908 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Found ECDT"));
911 * Generate a temporary ec context to use until the namespace is scanned
913 ec_ecdt
= kmalloc(sizeof(struct acpi_ec
), GFP_KERNEL
);
916 memset(ec_ecdt
, 0, sizeof(struct acpi_ec
));
918 mutex_init(&ec_ecdt
->lock
);
919 if (acpi_ec_mode
== EC_INTR
) {
920 init_waitqueue_head(&ec_ecdt
->wait
);
922 ec_ecdt
->command_addr
= ecdt_ptr
->ec_control
.address
;
923 ec_ecdt
->data_addr
= ecdt_ptr
->ec_data
.address
;
924 ec_ecdt
->gpe
= ecdt_ptr
->gpe_bit
;
925 /* use the GL just to be safe */
926 ec_ecdt
->global_lock
= TRUE
;
927 ec_ecdt
->uid
= ecdt_ptr
->uid
;
930 acpi_get_handle(NULL
, ecdt_ptr
->ec_id
, &ec_ecdt
->handle
);
931 if (ACPI_FAILURE(status
)) {
937 ACPI_EXCEPTION((AE_INFO
, status
, "Could not use ECDT"));
944 static int __initdata acpi_fake_ecdt_enabled
;
945 int __init
acpi_ec_ecdt_probe(void)
950 ret
= acpi_ec_get_real_ecdt();
951 /* Try to make a fake ECDT */
952 if (ret
&& acpi_fake_ecdt_enabled
) {
953 ret
= acpi_ec_fake_ecdt();
960 * Install GPE handler
962 status
= acpi_install_gpe_handler(NULL
, ec_ecdt
->gpe
,
963 ACPI_GPE_EDGE_TRIGGERED
,
964 &acpi_ec_gpe_handler
, ec_ecdt
);
965 if (ACPI_FAILURE(status
)) {
968 acpi_set_gpe_type(NULL
, ec_ecdt
->gpe
, ACPI_GPE_TYPE_RUNTIME
);
969 acpi_enable_gpe(NULL
, ec_ecdt
->gpe
, ACPI_NOT_ISR
);
971 status
= acpi_install_address_space_handler(ACPI_ROOT_OBJECT
,
973 &acpi_ec_space_handler
,
974 &acpi_ec_space_setup
,
976 if (ACPI_FAILURE(status
)) {
977 acpi_remove_gpe_handler(NULL
, ec_ecdt
->gpe
,
978 &acpi_ec_gpe_handler
);
985 ACPI_EXCEPTION((AE_INFO
, status
, "Could not use ECDT"));
992 static int __init
acpi_ec_init(void)
1000 acpi_ec_dir
= proc_mkdir(ACPI_EC_CLASS
, acpi_root_dir
);
1004 /* Now register the driver for the EC */
1005 result
= acpi_bus_register_driver(&acpi_ec_driver
);
1007 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
1014 subsys_initcall(acpi_ec_init
);
1016 /* EC driver currently not unloadable */
1018 static void __exit
acpi_ec_exit(void)
1021 acpi_bus_unregister_driver(&acpi_ec_driver
);
1023 remove_proc_entry(ACPI_EC_CLASS
, acpi_root_dir
);
1029 static int __init
acpi_fake_ecdt_setup(char *str
)
1031 acpi_fake_ecdt_enabled
= 1;
1035 __setup("acpi_fake_ecdt", acpi_fake_ecdt_setup
);
1036 static int __init
acpi_ec_set_intr_mode(char *str
)
1040 if (!get_option(&str
, &intr
))
1044 acpi_ec_mode
= EC_INTR
;
1046 acpi_ec_mode
= EC_POLL
;
1048 acpi_ec_driver
.ops
.add
= acpi_ec_add
;
1049 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "EC %s mode.\n", intr
? "interrupt" : "polling"));
1054 __setup("ec_intr=", acpi_ec_set_intr_mode
);