2 * ec.c - ACPI Embedded Controller Driver (v2.1)
4 * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de>
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>
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 /* Uncomment next line to get verbose printout */
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>
41 #include <linux/spinlock.h>
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
46 #define ACPI_EC_CLASS "embedded_controller"
47 #define ACPI_EC_DEVICE_NAME "Embedded Controller"
48 #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 */
60 ACPI_EC_COMMAND_READ = 0x80,
61 ACPI_EC_COMMAND_WRITE = 0x81,
62 ACPI_EC_BURST_ENABLE = 0x82,
63 ACPI_EC_BURST_DISABLE = 0x83,
64 ACPI_EC_COMMAND_QUERY = 0x84,
67 #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */
68 #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
69 #define ACPI_EC_CDELAY 10 /* Wait 10us before polling EC */
70 #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */
72 #define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts
73 per one transaction */
76 EC_FLAGS_QUERY_PENDING, /* Query is pending */
77 EC_FLAGS_GPE_STORM, /* GPE storm detected */
78 EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
79 * OpReg are installed */
82 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
83 /* External interfaces use first EC only, so remember */
84 typedef int (*acpi_ec_query_func) (void *data);
86 struct acpi_ec_query_handler {
87 struct list_head node;
88 acpi_ec_query_func func;
97 unsigned short irq_count;
106 static struct acpi_ec {
109 unsigned long command_addr;
110 unsigned long data_addr;
111 unsigned long global_lock;
114 wait_queue_head_t wait;
115 struct list_head list;
116 struct transaction *curr;
117 spinlock_t curr_lock;
118 } *boot_ec, *first_ec;
120 static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
122 /* --------------------------------------------------------------------------
123 Transaction Management
124 -------------------------------------------------------------------------- */
126 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
128 u8 x = inb(ec->command_addr);
129 pr_debug(PREFIX "---> status = 0x%2.2x\n", x);
133 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)
135 u8 x = inb(ec->data_addr);
136 pr_debug(PREFIX "---> data = 0x%2.2x\n", x);
140 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)
142 pr_debug(PREFIX "<--- command = 0x%2.2x\n", command);
143 outb(command, ec->command_addr);
146 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)
148 pr_debug(PREFIX "<--- data = 0x%2.2x\n", data);
149 outb(data, ec->data_addr);
152 static int ec_transaction_done(struct acpi_ec *ec)
156 spin_lock_irqsave(&ec->curr_lock, flags);
157 if (!ec->curr || ec->curr->done)
159 spin_unlock_irqrestore(&ec->curr_lock, flags);
163 static void start_transaction(struct acpi_ec *ec)
165 ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;
166 ec->curr->done = false;
167 acpi_ec_write_cmd(ec, ec->curr->command);
170 static void advance_transaction(struct acpi_ec *ec, u8 status)
173 spin_lock_irqsave(&ec->curr_lock, flags);
176 if (ec->curr->wlen > ec->curr->wi) {
177 if ((status & ACPI_EC_FLAG_IBF) == 0)
178 acpi_ec_write_data(ec,
179 ec->curr->wdata[ec->curr->wi++]);
182 } else if (ec->curr->rlen > ec->curr->ri) {
183 if ((status & ACPI_EC_FLAG_OBF) == 1) {
184 ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec);
185 if (ec->curr->rlen == ec->curr->ri)
186 ec->curr->done = true;
189 } else if (ec->curr->wlen == ec->curr->wi &&
190 (status & ACPI_EC_FLAG_IBF) == 0)
191 ec->curr->done = true;
194 /* false interrupt, state didn't change */
196 ++ec->curr->irq_count;
198 spin_unlock_irqrestore(&ec->curr_lock, flags);
201 static void acpi_ec_gpe_query(void *ec_cxt);
203 static int ec_check_sci(struct acpi_ec *ec, u8 state)
205 if (state & ACPI_EC_FLAG_SCI) {
206 if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags))
207 return acpi_os_execute(OSL_EC_BURST_HANDLER,
208 acpi_ec_gpe_query, ec);
213 static int ec_poll(struct acpi_ec *ec)
216 int repeat = 2; /* number of command restarts */
218 unsigned long delay = jiffies +
219 msecs_to_jiffies(ACPI_EC_DELAY);
221 /* don't sleep with disabled interrupts */
222 if (EC_FLAGS_MSI || irqs_disabled()) {
223 udelay(ACPI_EC_MSI_UDELAY);
224 if (ec_transaction_done(ec))
227 if (wait_event_timeout(ec->wait,
228 ec_transaction_done(ec),
229 msecs_to_jiffies(1)))
232 advance_transaction(ec, acpi_ec_read_status(ec));
233 } while (time_before(jiffies, delay));
234 if (!ec->curr->irq_count ||
235 (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF))
237 /* try restart command if we get any false interrupts */
238 pr_debug(PREFIX "controller reset, restart transaction\n");
239 spin_lock_irqsave(&ec->curr_lock, flags);
240 start_transaction(ec);
241 spin_unlock_irqrestore(&ec->curr_lock, flags);
246 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
247 struct transaction *t)
251 pr_debug(PREFIX "transaction start\n");
252 /* disable GPE during transaction if storm is detected */
253 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
254 acpi_disable_gpe(NULL, ec->gpe);
257 udelay(ACPI_EC_MSI_UDELAY);
258 /* start transaction */
259 spin_lock_irqsave(&ec->curr_lock, tmp);
260 /* following two actions should be kept atomic */
262 start_transaction(ec);
263 if (ec->curr->command == ACPI_EC_COMMAND_QUERY)
264 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
265 spin_unlock_irqrestore(&ec->curr_lock, tmp);
267 pr_debug(PREFIX "transaction end\n");
268 spin_lock_irqsave(&ec->curr_lock, tmp);
270 spin_unlock_irqrestore(&ec->curr_lock, tmp);
271 if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
272 /* check if we received SCI during transaction */
273 ec_check_sci(ec, acpi_ec_read_status(ec));
274 /* it is safe to enable GPE outside of transaction */
275 acpi_enable_gpe(NULL, ec->gpe);
276 } else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {
277 pr_info(PREFIX "GPE storm detected, "
278 "transactions will use polling mode\n");
279 set_bit(EC_FLAGS_GPE_STORM, &ec->flags);
284 static int ec_check_ibf0(struct acpi_ec *ec)
286 u8 status = acpi_ec_read_status(ec);
287 return (status & ACPI_EC_FLAG_IBF) == 0;
290 static int ec_wait_ibf0(struct acpi_ec *ec)
292 unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
293 /* interrupt wait manually if GPE mode is not active */
294 while (time_before(jiffies, delay))
295 if (wait_event_timeout(ec->wait, ec_check_ibf0(ec),
296 msecs_to_jiffies(1)))
301 static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
305 if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
308 memset(t->rdata, 0, t->rlen);
309 mutex_lock(&ec->lock);
310 if (ec->global_lock) {
311 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
312 if (ACPI_FAILURE(status)) {
317 if (ec_wait_ibf0(ec)) {
318 pr_err(PREFIX "input buffer is not empty, "
319 "aborting transaction\n");
323 status = acpi_ec_transaction_unlocked(ec, t);
326 acpi_release_global_lock(glk);
328 mutex_unlock(&ec->lock);
332 static int acpi_ec_burst_enable(struct acpi_ec *ec)
335 struct transaction t = {.command = ACPI_EC_BURST_ENABLE,
336 .wdata = NULL, .rdata = &d,
337 .wlen = 0, .rlen = 1};
339 return acpi_ec_transaction(ec, &t);
342 static int acpi_ec_burst_disable(struct acpi_ec *ec)
344 struct transaction t = {.command = ACPI_EC_BURST_DISABLE,
345 .wdata = NULL, .rdata = NULL,
346 .wlen = 0, .rlen = 0};
348 return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?
349 acpi_ec_transaction(ec, &t) : 0;
352 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
356 struct transaction t = {.command = ACPI_EC_COMMAND_READ,
357 .wdata = &address, .rdata = &d,
358 .wlen = 1, .rlen = 1};
360 result = acpi_ec_transaction(ec, &t);
365 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)
367 u8 wdata[2] = { address, data };
368 struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
369 .wdata = wdata, .rdata = NULL,
370 .wlen = 2, .rlen = 0};
372 return acpi_ec_transaction(ec, &t);
376 * Externally callable EC access functions. For now, assume 1 EC only
378 int ec_burst_enable(void)
382 return acpi_ec_burst_enable(first_ec);
385 EXPORT_SYMBOL(ec_burst_enable);
387 int ec_burst_disable(void)
391 return acpi_ec_burst_disable(first_ec);
394 EXPORT_SYMBOL(ec_burst_disable);
396 int ec_read(u8 addr, u8 * val)
404 err = acpi_ec_read(first_ec, addr, &temp_data);
413 EXPORT_SYMBOL(ec_read);
415 int ec_write(u8 addr, u8 val)
422 err = acpi_ec_write(first_ec, addr, val);
427 EXPORT_SYMBOL(ec_write);
429 int ec_transaction(u8 command,
430 const u8 * wdata, unsigned wdata_len,
431 u8 * rdata, unsigned rdata_len,
434 struct transaction t = {.command = command,
435 .wdata = wdata, .rdata = rdata,
436 .wlen = wdata_len, .rlen = rdata_len};
440 return acpi_ec_transaction(first_ec, &t);
443 EXPORT_SYMBOL(ec_transaction);
445 static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
449 struct transaction t = {.command = ACPI_EC_COMMAND_QUERY,
450 .wdata = NULL, .rdata = &d,
451 .wlen = 0, .rlen = 1};
456 * Query the EC to find out which _Qxx method we need to evaluate.
457 * Note that successful completion of the query causes the ACPI_EC_SCI
458 * bit to be cleared (and thus clearing the interrupt source).
461 result = acpi_ec_transaction(ec, &t);
472 /* --------------------------------------------------------------------------
474 -------------------------------------------------------------------------- */
475 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
476 acpi_handle handle, acpi_ec_query_func func,
479 struct acpi_ec_query_handler *handler =
480 kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
484 handler->query_bit = query_bit;
485 handler->handle = handle;
486 handler->func = func;
487 handler->data = data;
488 mutex_lock(&ec->lock);
489 list_add(&handler->node, &ec->list);
490 mutex_unlock(&ec->lock);
494 EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
496 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
498 struct acpi_ec_query_handler *handler, *tmp;
499 mutex_lock(&ec->lock);
500 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
501 if (query_bit == handler->query_bit) {
502 list_del(&handler->node);
506 mutex_unlock(&ec->lock);
509 EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
511 static void acpi_ec_gpe_query(void *ec_cxt)
513 struct acpi_ec *ec = ec_cxt;
515 struct acpi_ec_query_handler *handler, copy;
517 if (!ec || acpi_ec_query(ec, &value))
519 mutex_lock(&ec->lock);
520 list_for_each_entry(handler, &ec->list, node) {
521 if (value == handler->query_bit) {
522 /* have custom handler for this bit */
523 memcpy(©, handler, sizeof(copy));
524 mutex_unlock(&ec->lock);
526 copy.func(copy.data);
527 } else if (copy.handle) {
528 acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
533 mutex_unlock(&ec->lock);
536 static u32 acpi_ec_gpe_handler(void *data)
538 struct acpi_ec *ec = data;
541 pr_debug(PREFIX "~~~> interrupt\n");
542 status = acpi_ec_read_status(ec);
544 advance_transaction(ec, status);
545 if (ec_transaction_done(ec) && (status & ACPI_EC_FLAG_IBF) == 0)
547 ec_check_sci(ec, status);
548 return ACPI_INTERRUPT_HANDLED;
551 /* --------------------------------------------------------------------------
552 Address Space Management
553 -------------------------------------------------------------------------- */
556 acpi_ec_space_handler(u32 function, acpi_physical_address address,
557 u32 bits, acpi_integer *value,
558 void *handler_context, void *region_context)
560 struct acpi_ec *ec = handler_context;
564 if ((address > 0xFF) || !value || !handler_context)
565 return AE_BAD_PARAMETER;
567 if (function != ACPI_READ && function != ACPI_WRITE)
568 return AE_BAD_PARAMETER;
570 if (bits != 8 && acpi_strict)
571 return AE_BAD_PARAMETER;
574 acpi_ec_burst_enable(ec);
576 if (function == ACPI_READ) {
577 result = acpi_ec_read(ec, address, &temp);
580 temp = 0xff & (*value);
581 result = acpi_ec_write(ec, address, temp);
584 for (i = 8; unlikely(bits - i > 0); i += 8) {
586 if (function == ACPI_READ) {
587 result = acpi_ec_read(ec, address, &temp);
588 (*value) |= ((acpi_integer)temp) << i;
590 temp = 0xff & ((*value) >> i);
591 result = acpi_ec_write(ec, address, temp);
596 acpi_ec_burst_disable(ec);
600 return AE_BAD_PARAMETER;
613 /* --------------------------------------------------------------------------
615 -------------------------------------------------------------------------- */
617 static struct proc_dir_entry *acpi_ec_dir;
619 static int acpi_ec_read_info(struct seq_file *seq, void *offset)
621 struct acpi_ec *ec = seq->private;
626 seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe);
627 seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n",
628 (unsigned)ec->command_addr, (unsigned)ec->data_addr);
629 seq_printf(seq, "use global lock:\t%s\n",
630 ec->global_lock ? "yes" : "no");
635 static int acpi_ec_info_open_fs(struct inode *inode, struct file *file)
637 return single_open(file, acpi_ec_read_info, PDE(inode)->data);
640 static const struct file_operations acpi_ec_info_ops = {
641 .open = acpi_ec_info_open_fs,
644 .release = single_release,
645 .owner = THIS_MODULE,
648 static int acpi_ec_add_fs(struct acpi_device *device)
650 struct proc_dir_entry *entry = NULL;
652 if (!acpi_device_dir(device)) {
653 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
655 if (!acpi_device_dir(device))
659 entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO,
660 acpi_device_dir(device),
661 &acpi_ec_info_ops, acpi_driver_data(device));
667 static int acpi_ec_remove_fs(struct acpi_device *device)
670 if (acpi_device_dir(device)) {
671 remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device));
672 remove_proc_entry(acpi_device_bid(device), acpi_ec_dir);
673 acpi_device_dir(device) = NULL;
679 /* --------------------------------------------------------------------------
681 -------------------------------------------------------------------------- */
683 ec_parse_io_ports(struct acpi_resource *resource, void *context);
685 static struct acpi_ec *make_acpi_ec(void)
687 struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
690 ec->flags = 1 << EC_FLAGS_QUERY_PENDING;
691 mutex_init(&ec->lock);
692 init_waitqueue_head(&ec->wait);
693 INIT_LIST_HEAD(&ec->list);
694 spin_lock_init(&ec->curr_lock);
699 acpi_ec_register_query_methods(acpi_handle handle, u32 level,
700 void *context, void **return_value)
703 struct acpi_buffer buffer = { sizeof(node_name), node_name };
704 struct acpi_ec *ec = context;
708 status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
710 if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
711 acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
717 ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
720 unsigned long long tmp = 0;
722 struct acpi_ec *ec = context;
724 /* clear addr values, ec_parse_io_ports depend on it */
725 ec->command_addr = ec->data_addr = 0;
727 status = acpi_walk_resources(handle, METHOD_NAME__CRS,
728 ec_parse_io_ports, ec);
729 if (ACPI_FAILURE(status))
732 /* Get GPE bit assignment (EC events). */
733 /* TODO: Add support for _GPE returning a package */
734 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp);
735 if (ACPI_FAILURE(status))
738 /* Use the global lock for all EC transactions? */
740 acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
741 ec->global_lock = tmp;
743 return AE_CTRL_TERMINATE;
746 static int ec_install_handlers(struct acpi_ec *ec)
749 if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))
751 status = acpi_install_gpe_handler(NULL, ec->gpe,
752 ACPI_GPE_EDGE_TRIGGERED,
753 &acpi_ec_gpe_handler, ec);
754 if (ACPI_FAILURE(status))
756 acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
757 acpi_enable_gpe(NULL, ec->gpe);
758 status = acpi_install_address_space_handler(ec->handle,
760 &acpi_ec_space_handler,
762 if (ACPI_FAILURE(status)) {
763 if (status == AE_NOT_FOUND) {
765 * Maybe OS fails in evaluating the _REG object.
766 * The AE_NOT_FOUND error will be ignored and OS
767 * continue to initialize EC.
769 printk(KERN_ERR "Fail in evaluating the _REG object"
770 " of EC device. Broken bios is suspected.\n");
772 acpi_remove_gpe_handler(NULL, ec->gpe,
773 &acpi_ec_gpe_handler);
778 set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
782 static void ec_remove_handlers(struct acpi_ec *ec)
784 if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
785 ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
786 pr_err(PREFIX "failed to remove space handler\n");
787 if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,
788 &acpi_ec_gpe_handler)))
789 pr_err(PREFIX "failed to remove gpe handler\n");
790 clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);
793 static int acpi_ec_add(struct acpi_device *device)
795 struct acpi_ec *ec = NULL;
798 strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
799 strcpy(acpi_device_class(device), ACPI_EC_CLASS);
801 /* Check for boot EC */
803 (boot_ec->handle == device->handle ||
804 boot_ec->handle == ACPI_ROOT_OBJECT)) {
812 if (ec_parse_device(device->handle, 0, ec, NULL) !=
818 ec->handle = device->handle;
820 /* Find and register all query methods */
821 acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,
822 acpi_ec_register_query_methods, ec, NULL);
826 device->driver_data = ec;
827 acpi_ec_add_fs(device);
828 pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n",
829 ec->gpe, ec->command_addr, ec->data_addr);
831 ret = ec_install_handlers(ec);
833 /* EC is fully operational, allow queries */
834 clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);
838 static int acpi_ec_remove(struct acpi_device *device, int type)
841 struct acpi_ec_query_handler *handler, *tmp;
846 ec = acpi_driver_data(device);
847 ec_remove_handlers(ec);
848 mutex_lock(&ec->lock);
849 list_for_each_entry_safe(handler, tmp, &ec->list, node) {
850 list_del(&handler->node);
853 mutex_unlock(&ec->lock);
854 acpi_ec_remove_fs(device);
855 device->driver_data = NULL;
863 ec_parse_io_ports(struct acpi_resource *resource, void *context)
865 struct acpi_ec *ec = context;
867 if (resource->type != ACPI_RESOURCE_TYPE_IO)
871 * The first address region returned is the data port, and
872 * the second address region returned is the status/command
875 if (ec->data_addr == 0)
876 ec->data_addr = resource->data.io.minimum;
877 else if (ec->command_addr == 0)
878 ec->command_addr = resource->data.io.minimum;
880 return AE_CTRL_TERMINATE;
885 int __init acpi_boot_ec_enable(void)
887 if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags))
889 if (!ec_install_handlers(boot_ec)) {
896 static const struct acpi_device_id ec_device_ids[] = {
901 int __init acpi_ec_ecdt_probe(void)
904 struct acpi_ec *saved_ec = NULL;
905 struct acpi_table_ecdt *ecdt_ptr;
907 boot_ec = make_acpi_ec();
911 * Generate a boot ec context
913 if (dmi_name_in_vendors("Micro-Star") ||
914 dmi_name_in_vendors("Notebook")) {
915 pr_info(PREFIX "Enabling special treatment for EC from MSI.\n");
918 status = acpi_get_table(ACPI_SIG_ECDT, 1,
919 (struct acpi_table_header **)&ecdt_ptr);
920 if (ACPI_SUCCESS(status)) {
921 pr_info(PREFIX "EC description table is found, configuring boot EC\n");
922 boot_ec->command_addr = ecdt_ptr->control.address;
923 boot_ec->data_addr = ecdt_ptr->data.address;
924 boot_ec->gpe = ecdt_ptr->gpe;
925 boot_ec->handle = ACPI_ROOT_OBJECT;
926 acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle);
927 /* Don't trust ECDT, which comes from ASUSTek */
928 if (!dmi_name_in_vendors("ASUS") && EC_FLAGS_MSI == 0)
930 saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
933 memcpy(saved_ec, boot_ec, sizeof(struct acpi_ec));
936 /* This workaround is needed only on some broken machines,
937 * which require early EC, but fail to provide ECDT */
938 printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n");
939 status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device,
941 /* Check that acpi_get_devices actually find something */
942 if (ACPI_FAILURE(status) || !boot_ec->handle)
945 /* try to find good ECDT from ASUSTek */
946 if (saved_ec->command_addr != boot_ec->command_addr ||
947 saved_ec->data_addr != boot_ec->data_addr ||
948 saved_ec->gpe != boot_ec->gpe ||
949 saved_ec->handle != boot_ec->handle)
950 pr_info(PREFIX "ASUSTek keeps feeding us with broken "
951 "ECDT tables, which are very hard to workaround. "
952 "Trying to use DSDT EC info instead. Please send "
953 "output of acpidump to linux-acpi@vger.kernel.org\n");
957 /* We really need to limit this workaround, the only ASUS,
958 * which needs it, has fake EC._INI method, so use it as flag.
959 * Keep boot_ec struct as it will be needed soon.
962 if (!dmi_name_in_vendors("ASUS") ||
963 ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI",
968 if (!ec_install_handlers(boot_ec)) {
978 static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
980 struct acpi_ec *ec = acpi_driver_data(device);
982 acpi_disable_gpe(NULL, ec->gpe);
986 static int acpi_ec_resume(struct acpi_device *device)
988 struct acpi_ec *ec = acpi_driver_data(device);
989 /* Enable use of GPE back */
990 acpi_enable_gpe(NULL, ec->gpe);
994 static struct acpi_driver acpi_ec_driver = {
996 .class = ACPI_EC_CLASS,
997 .ids = ec_device_ids,
1000 .remove = acpi_ec_remove,
1001 .suspend = acpi_ec_suspend,
1002 .resume = acpi_ec_resume,
1006 int __init acpi_ec_init(void)
1010 acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
1014 /* Now register the driver for the EC */
1015 result = acpi_bus_register_driver(&acpi_ec_driver);
1017 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
1024 /* EC driver currently not unloadable */
1026 static void __exit acpi_ec_exit(void)
1029 acpi_bus_unregister_driver(&acpi_ec_driver);
1031 remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);