127 static int acpi_ec_query(struct acpi_ec *ec, u8 *data);
128 static void advance_transaction(struct acpi_ec *ec);
180 #define ec_dbg_ref(ec, fmt, ...) \  argument
181 	ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__)
187 static bool acpi_ec_started(struct acpi_ec *ec)  in acpi_ec_started()  argument
189 	return test_bit(EC_FLAGS_STARTED, &ec->flags) &&  in acpi_ec_started()
190 	       !test_bit(EC_FLAGS_STOPPED, &ec->flags);  in acpi_ec_started()
193 static bool acpi_ec_flushed(struct acpi_ec *ec)  in acpi_ec_flushed()  argument
195 	return ec->reference_count == 1;  in acpi_ec_flushed()
202 static inline u8 acpi_ec_read_status(struct acpi_ec *ec)  in acpi_ec_read_status()  argument
204 	u8 x = inb(ec->command_addr);  in acpi_ec_read_status()
217 static inline u8 acpi_ec_read_data(struct acpi_ec *ec)  in acpi_ec_read_data()  argument
219 	u8 x = inb(ec->data_addr);  in acpi_ec_read_data()
221 	ec->curr->timestamp = jiffies;  in acpi_ec_read_data()
226 static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command)  in acpi_ec_write_cmd()  argument
229 	outb(command, ec->command_addr);  in acpi_ec_write_cmd()
230 	ec->curr->timestamp = jiffies;  in acpi_ec_write_cmd()
233 static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data)  in acpi_ec_write_data()  argument
236 	outb(data, ec->data_addr);  in acpi_ec_write_data()
237 	ec->curr->timestamp = jiffies;  in acpi_ec_write_data()
265 static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec)  in acpi_ec_is_gpe_raised()  argument
269 	(void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status);  in acpi_ec_is_gpe_raised()
273 static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open)  in acpi_ec_enable_gpe()  argument
276 		acpi_enable_gpe(NULL, ec->gpe);  in acpi_ec_enable_gpe()
278 		BUG_ON(ec->reference_count < 1);  in acpi_ec_enable_gpe()
279 		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);  in acpi_ec_enable_gpe()
281 	if (acpi_ec_is_gpe_raised(ec)) {  in acpi_ec_enable_gpe()
288 		advance_transaction(ec);  in acpi_ec_enable_gpe()
292 static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close)  in acpi_ec_disable_gpe()  argument
295 		acpi_disable_gpe(NULL, ec->gpe);  in acpi_ec_disable_gpe()
297 		BUG_ON(ec->reference_count < 1);  in acpi_ec_disable_gpe()
298 		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);  in acpi_ec_disable_gpe()
302 static inline void acpi_ec_clear_gpe(struct acpi_ec *ec)  in acpi_ec_clear_gpe()  argument
314 	if (!acpi_ec_is_gpe_raised(ec))  in acpi_ec_clear_gpe()
316 	acpi_clear_gpe(NULL, ec->gpe);  in acpi_ec_clear_gpe()
323 static void acpi_ec_submit_request(struct acpi_ec *ec)  in acpi_ec_submit_request()  argument
325 	ec->reference_count++;  in acpi_ec_submit_request()
326 	if (ec->reference_count == 1)  in acpi_ec_submit_request()
327 		acpi_ec_enable_gpe(ec, true);  in acpi_ec_submit_request()
330 static void acpi_ec_complete_request(struct acpi_ec *ec)  in acpi_ec_complete_request()  argument
334 	ec->reference_count--;  in acpi_ec_complete_request()
335 	if (ec->reference_count == 0)  in acpi_ec_complete_request()
336 		acpi_ec_disable_gpe(ec, true);  in acpi_ec_complete_request()
337 	flushed = acpi_ec_flushed(ec);  in acpi_ec_complete_request()
339 		wake_up(&ec->wait);  in acpi_ec_complete_request()
342 static void acpi_ec_set_storm(struct acpi_ec *ec, u8 flag)  in acpi_ec_set_storm()  argument
344 	if (!test_bit(flag, &ec->flags)) {  in acpi_ec_set_storm()
345 		acpi_ec_disable_gpe(ec, false);  in acpi_ec_set_storm()
347 		set_bit(flag, &ec->flags);  in acpi_ec_set_storm()
351 static void acpi_ec_clear_storm(struct acpi_ec *ec, u8 flag)  in acpi_ec_clear_storm()  argument
353 	if (test_bit(flag, &ec->flags)) {  in acpi_ec_clear_storm()
354 		clear_bit(flag, &ec->flags);  in acpi_ec_clear_storm()
355 		acpi_ec_enable_gpe(ec, false);  in acpi_ec_clear_storm()
371 static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec)  in acpi_ec_submit_flushable_request()  argument
373 	if (!acpi_ec_started(ec))  in acpi_ec_submit_flushable_request()
375 	acpi_ec_submit_request(ec);  in acpi_ec_submit_flushable_request()
379 static void acpi_ec_submit_query(struct acpi_ec *ec)  in acpi_ec_submit_query()  argument
381 	if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) {  in acpi_ec_submit_query()
383 		schedule_work(&ec->work);  in acpi_ec_submit_query()
387 static void acpi_ec_complete_query(struct acpi_ec *ec)  in acpi_ec_complete_query()  argument
389 	if (ec->curr->command == ACPI_EC_COMMAND_QUERY) {  in acpi_ec_complete_query()
390 		clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);  in acpi_ec_complete_query()
395 static int ec_transaction_completed(struct acpi_ec *ec)  in ec_transaction_completed()  argument
400 	spin_lock_irqsave(&ec->lock, flags);  in ec_transaction_completed()
401 	if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE))  in ec_transaction_completed()
403 	spin_unlock_irqrestore(&ec->lock, flags);  in ec_transaction_completed()
407 static void advance_transaction(struct acpi_ec *ec)  in advance_transaction()  argument
420 	acpi_ec_clear_gpe(ec);  in advance_transaction()
421 	status = acpi_ec_read_status(ec);  in advance_transaction()
422 	t = ec->curr;  in advance_transaction()
428 				acpi_ec_write_data(ec, t->wdata[t->wi++]);  in advance_transaction()
433 				t->rdata[t->ri++] = acpi_ec_read_data(ec);  in advance_transaction()
454 			acpi_ec_complete_query(ec);  in advance_transaction()
461 			acpi_ec_write_cmd(ec, t->command);  in advance_transaction()
463 			acpi_ec_complete_query(ec);  in advance_transaction()
479 				acpi_ec_set_storm(ec, EC_FLAGS_COMMAND_STORM);  in advance_transaction()
484 		acpi_ec_submit_query(ec);  in advance_transaction()
486 		wake_up(&ec->wait);  in advance_transaction()
489 static void start_transaction(struct acpi_ec *ec)  in start_transaction()  argument
491 	ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0;  in start_transaction()
492 	ec->curr->flags = 0;  in start_transaction()
493 	ec->curr->timestamp = jiffies;  in start_transaction()
494 	advance_transaction(ec);  in start_transaction()
497 static int ec_poll(struct acpi_ec *ec)  in ec_poll()  argument
511 				if (ec_transaction_completed(ec))  in ec_poll()
514 				if (wait_event_timeout(ec->wait,  in ec_poll()
515 						ec_transaction_completed(ec),  in ec_poll()
519 			spin_lock_irqsave(&ec->lock, flags);  in ec_poll()
521 					ec->curr->timestamp +  in ec_poll()
523 				advance_transaction(ec);  in ec_poll()
524 			spin_unlock_irqrestore(&ec->lock, flags);  in ec_poll()
527 		spin_lock_irqsave(&ec->lock, flags);  in ec_poll()
528 		start_transaction(ec);  in ec_poll()
529 		spin_unlock_irqrestore(&ec->lock, flags);  in ec_poll()
534 static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,  in acpi_ec_transaction_unlocked()  argument
543 	spin_lock_irqsave(&ec->lock, tmp);  in acpi_ec_transaction_unlocked()
545 	if (!acpi_ec_submit_flushable_request(ec)) {  in acpi_ec_transaction_unlocked()
549 	ec_dbg_ref(ec, "Increase command");  in acpi_ec_transaction_unlocked()
551 	ec->curr = t;  in acpi_ec_transaction_unlocked()
553 	start_transaction(ec);  in acpi_ec_transaction_unlocked()
554 	spin_unlock_irqrestore(&ec->lock, tmp);  in acpi_ec_transaction_unlocked()
555 	ret = ec_poll(ec);  in acpi_ec_transaction_unlocked()
556 	spin_lock_irqsave(&ec->lock, tmp);  in acpi_ec_transaction_unlocked()
558 		acpi_ec_clear_storm(ec, EC_FLAGS_COMMAND_STORM);  in acpi_ec_transaction_unlocked()
560 	ec->curr = NULL;  in acpi_ec_transaction_unlocked()
562 	acpi_ec_complete_request(ec);  in acpi_ec_transaction_unlocked()
563 	ec_dbg_ref(ec, "Decrease command");  in acpi_ec_transaction_unlocked()
565 	spin_unlock_irqrestore(&ec->lock, tmp);  in acpi_ec_transaction_unlocked()
569 static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)  in acpi_ec_transaction()  argument
574 	if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))  in acpi_ec_transaction()
578 	mutex_lock(&ec->mutex);  in acpi_ec_transaction()
579 	if (ec->global_lock) {  in acpi_ec_transaction()
587 	status = acpi_ec_transaction_unlocked(ec, t);  in acpi_ec_transaction()
589 	if (test_bit(EC_FLAGS_COMMAND_STORM, &ec->flags))  in acpi_ec_transaction()
591 	if (ec->global_lock)  in acpi_ec_transaction()
594 	mutex_unlock(&ec->mutex);  in acpi_ec_transaction()
598 static int acpi_ec_burst_enable(struct acpi_ec *ec)  in acpi_ec_burst_enable()  argument
605 	return acpi_ec_transaction(ec, &t);  in acpi_ec_burst_enable()
608 static int acpi_ec_burst_disable(struct acpi_ec *ec)  in acpi_ec_burst_disable()  argument
614 	return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ?  in acpi_ec_burst_disable()
615 				acpi_ec_transaction(ec, &t) : 0;  in acpi_ec_burst_disable()
618 static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data)  in acpi_ec_read()  argument
626 	result = acpi_ec_transaction(ec, &t);  in acpi_ec_read()
631 static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data)  in acpi_ec_write()  argument
638 	return acpi_ec_transaction(ec, &t);  in acpi_ec_write()
700 static void acpi_ec_clear(struct acpi_ec *ec)  in acpi_ec_clear()  argument
706 		status = acpi_ec_query(ec, &value);  in acpi_ec_clear()
717 static void acpi_ec_start(struct acpi_ec *ec, bool resuming)  in acpi_ec_start()  argument
721 	spin_lock_irqsave(&ec->lock, flags);  in acpi_ec_start()
722 	if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) {  in acpi_ec_start()
726 			acpi_ec_submit_request(ec);  in acpi_ec_start()
727 			ec_dbg_ref(ec, "Increase driver");  in acpi_ec_start()
731 	spin_unlock_irqrestore(&ec->lock, flags);  in acpi_ec_start()
734 static bool acpi_ec_stopped(struct acpi_ec *ec)  in acpi_ec_stopped()  argument
739 	spin_lock_irqsave(&ec->lock, flags);  in acpi_ec_stopped()
740 	flushed = acpi_ec_flushed(ec);  in acpi_ec_stopped()
741 	spin_unlock_irqrestore(&ec->lock, flags);  in acpi_ec_stopped()
745 static void acpi_ec_stop(struct acpi_ec *ec, bool suspending)  in acpi_ec_stop()  argument
749 	spin_lock_irqsave(&ec->lock, flags);  in acpi_ec_stop()
750 	if (acpi_ec_started(ec)) {  in acpi_ec_stop()
752 		set_bit(EC_FLAGS_STOPPED, &ec->flags);  in acpi_ec_stop()
753 		spin_unlock_irqrestore(&ec->lock, flags);  in acpi_ec_stop()
754 		wait_event(ec->wait, acpi_ec_stopped(ec));  in acpi_ec_stop()
755 		spin_lock_irqsave(&ec->lock, flags);  in acpi_ec_stop()
758 			acpi_ec_complete_request(ec);  in acpi_ec_stop()
759 			ec_dbg_ref(ec, "Decrease driver");  in acpi_ec_stop()
761 		clear_bit(EC_FLAGS_STARTED, &ec->flags);  in acpi_ec_stop()
762 		clear_bit(EC_FLAGS_STOPPED, &ec->flags);  in acpi_ec_stop()
765 	spin_unlock_irqrestore(&ec->lock, flags);  in acpi_ec_stop()
770 	struct acpi_ec *ec = first_ec;  in acpi_ec_block_transactions()  local
772 	if (!ec)  in acpi_ec_block_transactions()
775 	mutex_lock(&ec->mutex);  in acpi_ec_block_transactions()
777 	acpi_ec_stop(ec, true);  in acpi_ec_block_transactions()
778 	mutex_unlock(&ec->mutex);  in acpi_ec_block_transactions()
783 	struct acpi_ec *ec = first_ec;  in acpi_ec_unblock_transactions()  local
785 	if (!ec)  in acpi_ec_unblock_transactions()
789 	acpi_ec_start(ec, true);  in acpi_ec_unblock_transactions()
792 		acpi_ec_clear(ec);  in acpi_ec_unblock_transactions()
829 int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,  in acpi_ec_add_query_handler()  argument
843 	mutex_lock(&ec->mutex);  in acpi_ec_add_query_handler()
845 	list_add(&handler->node, &ec->list);  in acpi_ec_add_query_handler()
846 	mutex_unlock(&ec->mutex);  in acpi_ec_add_query_handler()
851 void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)  in acpi_ec_remove_query_handler()  argument
856 	mutex_lock(&ec->mutex);  in acpi_ec_remove_query_handler()
857 	list_for_each_entry_safe(handler, tmp, &ec->list, node) {  in acpi_ec_remove_query_handler()
863 	mutex_unlock(&ec->mutex);  in acpi_ec_remove_query_handler()
884 static int acpi_ec_query(struct acpi_ec *ec, u8 *data)  in acpi_ec_query()  argument
899 	result = acpi_ec_transaction(ec, &t);  in acpi_ec_query()
907 	mutex_lock(&ec->mutex);  in acpi_ec_query()
908 	list_for_each_entry(handler, &ec->list, node) {  in acpi_ec_query()
922 	mutex_unlock(&ec->mutex);  in acpi_ec_query()
928 	struct acpi_ec *ec = container_of(work, struct acpi_ec, work);  in acpi_ec_gpe_poller()  local
930 	acpi_ec_query(ec, NULL);  in acpi_ec_gpe_poller()
937 	struct acpi_ec *ec = data;  in acpi_ec_gpe_handler()  local
939 	spin_lock_irqsave(&ec->lock, flags);  in acpi_ec_gpe_handler()
940 	advance_transaction(ec);  in acpi_ec_gpe_handler()
941 	spin_unlock_irqrestore(&ec->lock, flags);  in acpi_ec_gpe_handler()
954 	struct acpi_ec *ec = handler_context;  in acpi_ec_space_handler()  local
965 		acpi_ec_burst_enable(ec);  in acpi_ec_space_handler()
969 			acpi_ec_read(ec, address, value) :  in acpi_ec_space_handler()
970 			acpi_ec_write(ec, address, *value);  in acpi_ec_space_handler()
973 		acpi_ec_burst_disable(ec);  in acpi_ec_space_handler()
996 	struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);  in make_acpi_ec()  local
998 	if (!ec)  in make_acpi_ec()
1000 	ec->flags = 1 << EC_FLAGS_QUERY_PENDING;  in make_acpi_ec()
1001 	mutex_init(&ec->mutex);  in make_acpi_ec()
1002 	init_waitqueue_head(&ec->wait);  in make_acpi_ec()
1003 	INIT_LIST_HEAD(&ec->list);  in make_acpi_ec()
1004 	spin_lock_init(&ec->lock);  in make_acpi_ec()
1005 	INIT_WORK(&ec->work, acpi_ec_gpe_poller);  in make_acpi_ec()
1006 	return ec;  in make_acpi_ec()
1015 	struct acpi_ec *ec = context;  in acpi_ec_register_query_methods()  local
1022 		acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);  in acpi_ec_register_query_methods()
1031 	struct acpi_ec *ec = context;  in ec_parse_device()  local
1034 	ec->command_addr = ec->data_addr = 0;  in ec_parse_device()
1037 				     ec_parse_io_ports, ec);  in ec_parse_device()
1046 	ec->gpe = tmp;  in ec_parse_device()
1050 	ec->global_lock = tmp;  in ec_parse_device()
1051 	ec->handle = handle;  in ec_parse_device()
1055 static int ec_install_handlers(struct acpi_ec *ec)  in ec_install_handlers()  argument
1059 	if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))  in ec_install_handlers()
1061 	status = acpi_install_gpe_raw_handler(NULL, ec->gpe,  in ec_install_handlers()
1063 				  &acpi_ec_gpe_handler, ec);  in ec_install_handlers()
1067 	acpi_ec_start(ec, false);  in ec_install_handlers()
1068 	status = acpi_install_address_space_handler(ec->handle,  in ec_install_handlers()
1071 						    NULL, ec);  in ec_install_handlers()
1082 			acpi_ec_stop(ec, false);  in ec_install_handlers()
1083 			acpi_remove_gpe_handler(NULL, ec->gpe,  in ec_install_handlers()
1089 	set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);  in ec_install_handlers()
1093 static void ec_remove_handlers(struct acpi_ec *ec)  in ec_remove_handlers()  argument
1095 	if (!test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags))  in ec_remove_handlers()
1097 	acpi_ec_stop(ec, false);  in ec_remove_handlers()
1098 	if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,  in ec_remove_handlers()
1101 	if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe,  in ec_remove_handlers()
1104 	clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags);  in ec_remove_handlers()
1109 	struct acpi_ec *ec = NULL;  in acpi_ec_add()  local
1119 		ec = boot_ec;  in acpi_ec_add()
1122 		ec = make_acpi_ec();  in acpi_ec_add()
1123 		if (!ec)  in acpi_ec_add()
1126 	if (ec_parse_device(device->handle, 0, ec, NULL) !=  in acpi_ec_add()
1128 			kfree(ec);  in acpi_ec_add()
1133 	acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1,  in acpi_ec_add()
1134 			    acpi_ec_register_query_methods, NULL, ec, NULL);  in acpi_ec_add()
1137 		first_ec = ec;  in acpi_ec_add()
1138 	device->driver_data = ec;  in acpi_ec_add()
1140 	ret = !!request_region(ec->data_addr, 1, "EC data");  in acpi_ec_add()
1141 	WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr);  in acpi_ec_add()
1142 	ret = !!request_region(ec->command_addr, 1, "EC cmd");  in acpi_ec_add()
1143 	WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr);  in acpi_ec_add()
1146 			  ec->gpe, ec->command_addr, ec->data_addr);  in acpi_ec_add()
1148 	ret = ec_install_handlers(ec);  in acpi_ec_add()
1151 	acpi_walk_dep_device_list(ec->handle);  in acpi_ec_add()
1154 	clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags);  in acpi_ec_add()
1158 		acpi_ec_clear(ec);  in acpi_ec_add()
1164 	struct acpi_ec *ec;  in acpi_ec_remove()  local
1170 	ec = acpi_driver_data(device);  in acpi_ec_remove()
1171 	ec_remove_handlers(ec);  in acpi_ec_remove()
1172 	mutex_lock(&ec->mutex);  in acpi_ec_remove()
1173 	list_for_each_entry_safe(handler, tmp, &ec->list, node) {  in acpi_ec_remove()
1177 	mutex_unlock(&ec->mutex);  in acpi_ec_remove()
1178 	release_region(ec->data_addr, 1);  in acpi_ec_remove()
1179 	release_region(ec->command_addr, 1);  in acpi_ec_remove()
1181 	if (ec == first_ec)  in acpi_ec_remove()
1183 	kfree(ec);  in acpi_ec_remove()
1190 	struct acpi_ec *ec = context;  in ec_parse_io_ports()  local
1200 	if (ec->data_addr == 0)  in ec_parse_io_ports()
1201 		ec->data_addr = resource->data.io.minimum;  in ec_parse_io_ports()
1202 	else if (ec->command_addr == 0)  in ec_parse_io_ports()
1203 		ec->command_addr = resource->data.io.minimum;  in ec_parse_io_ports()