/* * ec.c - ACPI Embedded Controller Driver (v2.1) * * Copyright (C) 2006-2008 Alexey Starikovskiy * Copyright (C) 2006 Denis Sadykov * Copyright (C) 2004 Luming Yu * Copyright (C) 2001, 2002 Andy Grover * Copyright (C) 2001, 2002 Paul Diefenbaugh * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ /* Uncomment next line to get verbose printout */ /* #define DEBUG */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "internal.h" #define ACPI_EC_CLASS "embedded_controller" #define ACPI_EC_DEVICE_NAME "Embedded Controller" #define ACPI_EC_FILE_INFO "info" #undef PREFIX #define PREFIX "ACPI: EC: " /* EC status register */ #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 */ /* EC commands */ enum ec_command { ACPI_EC_COMMAND_READ = 0x80, ACPI_EC_COMMAND_WRITE = 0x81, ACPI_EC_BURST_ENABLE = 0x82, ACPI_EC_BURST_DISABLE = 0x83, ACPI_EC_COMMAND_QUERY = 0x84, }; #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query * when trying to clear the EC */ enum { EC_FLAGS_QUERY_PENDING, /* Query is pending */ EC_FLAGS_GPE_STORM, /* GPE storm detected */ EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and * OpReg are installed */ EC_FLAGS_BLOCKED, /* Transactions are blocked */ }; /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; module_param(ec_delay, uint, 0644); MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); /* * If the number of false interrupts per one transaction exceeds * this threshold, will think there is a GPE storm happened and * will disable the GPE for normal transaction. */ static unsigned int ec_storm_threshold __read_mostly = 8; module_param(ec_storm_threshold, uint, 0644); MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); /* If we find an EC via the ECDT, we need to keep a ptr to its context */ /* External interfaces use first EC only, so remember */ typedef int (*acpi_ec_query_func) (void *data); struct acpi_ec_query_handler { struct list_head node; acpi_ec_query_func func; acpi_handle handle; void *data; u8 query_bit; }; struct transaction { const u8 *wdata; u8 *rdata; unsigned short irq_count; u8 command; u8 wi; u8 ri; u8 wlen; u8 rlen; bool done; }; struct acpi_ec *boot_ec, *first_ec; EXPORT_SYMBOL(first_ec); static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ /* -------------------------------------------------------------------------- Transaction Management -------------------------------------------------------------------------- */ static inline u8 acpi_ec_read_status(struct acpi_ec *ec) { u8 x = inb(ec->command_addr); pr_debug(PREFIX "---> status = 0x%2.2x\n", x); return x; } static inline u8 acpi_ec_read_data(struct acpi_ec *ec) { u8 x = inb(ec->data_addr); pr_debug(PREFIX "---> data = 0x%2.2x\n", x); return x; } static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) { pr_debug(PREFIX "<--- command = 0x%2.2x\n", command); outb(command, ec->command_addr); } static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) { pr_debug(PREFIX "<--- data = 0x%2.2x\n", data); outb(data, ec->data_addr); } static int ec_transaction_done(struct acpi_ec *ec) { unsigned long flags; int ret = 0; spin_lock_irqsave(&ec->lock, flags); if (!ec->curr || ec->curr->done) ret = 1; spin_unlock_irqrestore(&ec->lock, flags); return ret; } static void start_transaction(struct acpi_ec *ec) { ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; ec->curr->done = false; acpi_ec_write_cmd(ec, ec->curr->command); } static void advance_transaction(struct acpi_ec *ec, u8 status) { unsigned long flags; struct transaction *t; spin_lock_irqsave(&ec->lock, flags); t = ec->curr; if (!t) goto unlock; if (t->wlen > t->wi) { if ((status & ACPI_EC_FLAG_IBF) == 0) acpi_ec_write_data(ec, t->wdata[t->wi++]); else goto err; } else if (t->rlen > t->ri) { if ((status & ACPI_EC_FLAG_OBF) == 1) { t->rdata[t->ri++] = acpi_ec_read_data(ec); if (t->rlen == t->ri) t->done = true; } else goto err; } else if (t->wlen == t->wi && (status & ACPI_EC_FLAG_IBF) == 0) t->done = true; goto unlock; err: /* * If SCI bit is set, then don't think it's a false IRQ * otherwise will take a not handled IRQ as a false one. */ if (in_interrupt() && !(status & ACPI_EC_FLAG_SCI)) ++t->irq_count; unlock: spin_unlock_irqrestore(&ec->lock, flags); } static int acpi_ec_sync_query(struct acpi_ec *ec); static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) { if (state & ACPI_EC_FLAG_SCI) { if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) return acpi_ec_sync_query(ec); } return 0; } static int ec_poll(struct acpi_ec *ec) { unsigned long flags; int repeat = 5; /* number of command restarts */ while (repeat--) { unsigned long delay = jiffies + msecs_to_jiffies(ec_delay); do { /* don't sleep with disabled interrupts */ if (EC_FLAGS_MSI || irqs_disabled()) { udelay(ACPI_EC_MSI_UDELAY); if (ec_transaction_done(ec)) return 0; } else { if (wait_event_timeout(ec->wait, ec_transaction_done(ec), msecs_to_jiffies(1))) return 0; } advance_transaction(ec, acpi_ec_read_status(ec)); } while (time_before(jiffies, delay)); pr_debug(PREFIX "controller reset, restart transaction\n"); spin_lock_irqsave(&ec->lock, flags); start_transaction(ec); spin_unlock_irqrestore(&ec->lock, flags); } return -ETIME; } static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, struct transaction *t) { unsigned long tmp; int ret = 0; if (EC_FLAGS_MSI) udelay(ACPI_EC_MSI_UDELAY); /* start transaction */ spin_lock_irqsave(&ec->lock, tmp); /* following two actions should be kept atomic */ ec->curr = t; start_transaction(ec); if (ec->curr->command == ACPI_EC_COMMAND_QUERY) clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); spin_unlock_irqrestore(&ec->lock, tmp); ret = ec_poll(ec); spin_lock_irqsave(&ec->lock, tmp); ec->curr = NULL; spin_unlock_irqrestore(&ec->lock, tmp); return ret; } static int ec_check_ibf0(struct acpi_ec *ec) { u8 status = acpi_ec_read_status(ec); return (status & ACPI_EC_FLAG_IBF) == 0; } static int ec_wait_ibf0(struct acpi_ec *ec) { unsigned long delay = jiffies + msecs_to_jiffies(ec_delay); /* interrupt wait manually if GPE mode is not active */ while (time_before(jiffies, delay)) if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), msecs_to_jiffies(1))) return 0; return -ETIME; } static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) { int status; u32 glk; if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) return -EINVAL; if (t->rdata) memset(t->rdata, 0, t->rlen); mutex_lock(&ec->mutex); if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { status = -EINVAL; goto unlock; } if (ec->global_lock) { status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); if (ACPI_FAILURE(status)) { status = -ENODEV; goto unlock; } } if (ec_wait_ibf0(ec)) { pr_err(PREFIX "input buffer is not empty, " "aborting transaction\n"); status = -ETIME; goto end; } pr_debug(PREFIX "transaction start (cmd=0x%02x, addr=0x%02x)\n", t->command, t->wdata ? t->wdata[0] : 0); /* disable GPE during transaction if storm is detected */ if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { /* It has to be disabled, so that it doesn't trigger. */ acpi_disable_gpe(NULL, ec->gpe); } status = acpi_ec_transaction_unlocked(ec, t); /* check if we received SCI during transaction */ ec_check_sci_sync(ec, acpi_ec_read_status(ec)); if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { msleep(1); /* It is safe to enable the GPE outside of the transaction. */ acpi_enable_gpe(NULL, ec->gpe); } else if (t->irq_count > ec_storm_threshold) { pr_info(PREFIX "GPE storm detected(%d GPEs), " "transactions will use polling mode\n", t->irq_count); set_bit(EC_FLAGS_GPE_STORM, &ec->flags); } pr_debug(PREFIX "transaction end\n"); end: if (ec->global_lock) acpi_release_global_lock(glk); unlock: mutex_unlock(&ec->mutex); return status; } static int acpi_ec_burst_enable(struct acpi_ec *ec) { u8 d; struct transaction t = {.command = ACPI_EC_BURST_ENABLE, .wdata = NULL, .rdata = &d, .wlen = 0, .rlen = 1}; return acpi_ec_transaction(ec, &t); } static int acpi_ec_burst_disable(struct acpi_ec *ec) { struct transaction t = {.command = ACPI_EC_BURST_DISABLE, .wdata = NULL, .rdata = NULL, .wlen = 0, .rlen = 0}; return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? acpi_ec_transaction(ec, &t) : 0; } static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) { int result; u8 d; struct transaction t = {.command = ACPI_EC_COMMAND_READ, .wdata = &address, .rdata = &d, .wlen = 1, .rlen = 1}; result = acpi_ec_transaction(ec, &t); *data = d; return result; } static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) { u8 wdata[2] = { address, data }; struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, .wdata = wdata, .rdata = NULL, .wlen = 2, .rlen = 0}; return acpi_ec_transaction(ec, &t); } /* * Externally callable EC access functions. For now, assume 1 EC only */ int ec_burst_enable(void) { if (!first_ec) return -ENODEV; return acpi_ec_burst_enable(first_ec); } EXPORT_SYMBOL(ec_burst_enable); int ec_burst_disable(void) { if (!first_ec) return -ENODEV; return acpi_ec_burst_disable(first_ec); } EXPORT_SYMBOL(ec_burst_disable); int ec_read(u8 addr, u8 *val) { int err; u8 temp_data; if (!first_ec) return -ENODEV; err = acpi_ec_read(first_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) { int err; if (!first_ec) return -ENODEV; err = acpi_ec_write(first_ec, addr, val); return err; } EXPORT_SYMBOL(ec_write); int ec_transaction(u8 command, const u8 * wdata, unsigned wdata_len, u8 * rdata, unsigned rdata_len) { struct transaction t = {.command = command, .wdata = wdata, .rdata = rdata, .wlen = wdata_len, .rlen = rdata_len}; if (!first_ec) return -ENODEV; return acpi_ec_transaction(first_ec, &t); } EXPORT_SYMBOL(ec_transaction); /* Get the handle to the EC device */ acpi_handle ec_get_handle(void) { if (!first_ec) return NULL; return first_ec->handle; } EXPORT_SYMBOL(ec_get_handle); static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 *data); /* * Clears stale _Q events that might have accumulated in the EC. * Run with locked ec mutex. */ static void acpi_ec_clear(struct acpi_ec *ec) { int i, status; u8 value = 0; for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { status = acpi_ec_query_unlocked(ec, &value); if (status || !value) break; } if (unlikely(i == ACPI_EC_CLEAR_MAX)) pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); else pr_info("%d stale EC events cleared\n", i); } void acpi_ec_block_transactions(void) { struct acpi_ec *ec = first_ec; if (!ec) return; mutex_lock(&ec->mutex); /* Prevent transactions from being carried out */ set_bit(EC_FLAGS_BLOCKED, &ec->flags); mutex_unlock(&ec->mutex); } void acpi_ec_unblock_transactions(void) { struct acpi_ec *ec = first_ec; if (!ec) return; mutex_lock(&ec->mutex); /* Allow transactions to be carried out again */ clear_bit(EC_FLAGS_BLOCKED, &ec->flags); if (EC_FLAGS_CLEAR_ON_RESUME) acpi_ec_clear(ec); mutex_unlock(&ec->mutex); } void acpi_ec_unblock_transactions_early(void) { /* * Allow transactions to happen again (this function is called from * atomic context during wakeup, so we don't need to acquire the mutex). */ if (first_ec) clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); } static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) { int result; u8 d; struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, .wdata = NULL, .rdata = &d, .wlen = 0, .rlen = 1}; if (!ec || !data) return -EINVAL; /* * 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). */ result = acpi_ec_transaction_unlocked(ec, &t); if (result) return result; if (!d) return -ENODATA; *data = d; return 0; } /* -------------------------------------------------------------------------- Event Management -------------------------------------------------------------------------- */ int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, acpi_handle handle, acpi_ec_query_func func, void *data) { struct acpi_ec_query_handler *handler = kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); if (!handler) return -ENOMEM; handler->query_bit = query_bit; handler->handle = handle; handler->func = func; handler->data = data; mutex_lock(&ec->mutex); list_add(&handler->node, &ec->list); mutex_unlock(&ec->mutex); return 0; } EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) { struct acpi_ec_query_handler *handler, *tmp; mutex_lock(&ec->mutex); list_for_each_entry_safe(handler, tmp, &ec->list, node) { if (query_bit == handler->query_bit) { list_del(&handler->node); kfree(handler); } } mutex_unlock(&ec->mutex); } EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); static void acpi_ec_run(void *cxt) { struct acpi_ec_query_handler *handler = cxt; if (!handler) return; pr_debug(PREFIX "start query execution\n"); if (handler->func) handler->func(handler->data); else if (handler->handle) acpi_evaluate_object(handler->handle, NULL, NULL, NULL); pr_debug(PREFIX "stop query execution\n"); kfree(handler); } static int acpi_ec_sync_query(struct acpi_ec *ec) { u8 value = 0; int status; struct acpi_ec_query_handler *handler, *copy; if ((status = acpi_ec_query_unlocked(ec, &value))) return status; list_for_each_entry(handler, &ec->list, node) { if (value == handler->query_bit) { /* have custom handler for this bit */ copy = kmalloc(sizeof(*handler), GFP_KERNEL); if (!copy) return -ENOMEM; memcpy(copy, handler, sizeof(*copy)); pr_debug(PREFIX "push query execution (0x%2x) on queue\n", value); return acpi_os_execute((copy->func) ? OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, acpi_ec_run, copy); } } return 0; } static void acpi_ec_gpe_query(void *ec_cxt) { struct acpi_ec *ec = ec_cxt; if (!ec) return; mutex_lock(&ec->mutex); acpi_ec_sync_query(ec); mutex_unlock(&ec->mutex); } static int ec_check_sci(struct acpi_ec *ec, u8 state) { if (state & ACPI_EC_FLAG_SCI) { if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { pr_debug(PREFIX "push gpe query to the queue\n"); return acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ec_gpe_query, ec); } } return 0; } static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, u32 gpe_number, void *data) { struct acpi_ec *ec = data; u8 status = acpi_ec_read_status(ec); pr_debug(PREFIX "~~~> interrupt, status:0x%02x\n", status); advance_transaction(ec, status); if (ec_transaction_done(ec) && (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { wake_up(&ec->wait); ec_check_sci(ec, acpi_ec_read_status(ec)); } return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; } /* -------------------------------------------------------------------------- Address Space Management -------------------------------------------------------------------------- */ static acpi_status acpi_ec_space_handler(u32 function, acpi_physical_address address, u32 bits, u64 *value64, void *handler_context, void *region_context) { struct acpi_ec *ec = handler_context; int result = 0, i, bytes = bits / 8; u8 *value = (u8 *)value64; if ((address > 0xFF) || !value || !handler_context) return AE_BAD_PARAMETER; if (function != ACPI_READ && function != ACPI_WRITE) return AE_BAD_PARAMETER; if (EC_FLAGS_MSI || bits > 8) acpi_ec_burst_enable(ec); for (i = 0; i < bytes; ++i, ++address, ++value) result = (function == ACPI_READ) ? acpi_ec_read(ec, address, value) : acpi_ec_write(ec, address, *value); if (EC_FLAGS_MSI || bits > 8) acpi_ec_burst_disable(ec); switch (result) { case -EINVAL: return AE_BAD_PARAMETER; break; case -ENODEV: return AE_NOT_FOUND; break; case -ETIME: return AE_TIME; break; default: return AE_OK; } } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ static acpi_status ec_parse_io_ports(struct acpi_resource *resource, void *context); static struct acpi_ec *make_acpi_ec(void) { struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); if (!ec) return NULL; ec->flags = 1 << EC_FLAGS_QUERY_PENDING; mutex_init(&ec->mutex); init_waitqueue_head(&ec->wait); INIT_LIST_HEAD(&ec->list); spin_lock_init(&ec->lock); return ec; } static acpi_status acpi_ec_register_query_methods(acpi_handle handle, u32 level, void *context, void **return_value) { char node_name[5]; struct acpi_buffer buffer = { sizeof(node_name), node_name }; struct acpi_ec *ec = context; int value = 0; acpi_status status; status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); } return AE_OK; } static acpi_status ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) { acpi_status status; unsigned long long tmp = 0; struct acpi_ec *ec = context; /* clear addr values, ec_parse_io_ports depend on it */ ec->command_addr = ec->data_addr = 0; status = acpi_walk_resources(handle, METHOD_NAME__CRS, ec_parse_io_ports, ec); if (ACPI_FAILURE(status)) return status; /* Get GPE bit assignment (EC events). */ /* TODO: Add support for _GPE returning a package */ status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); if (ACPI_FAILURE(status)) return status; ec->gpe = tmp; /* Use the global lock for all EC transactions? */ tmp = 0; acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); ec->global_lock = tmp; ec->handle = handle; return AE_CTRL_TERMINATE; } static int ec_install_handlers(struct acpi_ec *ec) { acpi_status status; if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) return 0; status = acpi_install_gpe_handler(NULL, ec->gpe, ACPI_GPE_EDGE_TRIGGERED, &acpi_ec_gpe_handler, ec); if (ACPI_FAILURE(status)) return -ENODEV; acpi_enable_gpe(NULL, ec->gpe); status = acpi_install_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler, NULL, ec); if (ACPI_FAILURE(status)) { if (status == AE_NOT_FOUND) { /* * Maybe OS fails in evaluating the _REG object. * The AE_NOT_FOUND error will be ignored and OS * continue to initialize EC. */ printk(KERN_ERR "Fail in evaluating the _REG object" " of EC device. Broken bios is suspected.\n"); } else { acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler); acpi_disable_gpe(NULL, ec->gpe); return -ENODEV; } } set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); return 0; } static void ec_remove_handlers(struct acpi_ec *ec) { acpi_disable_gpe(NULL, ec->gpe); if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) pr_err(PREFIX "failed to remove space handler\n"); if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler))) pr_err(PREFIX "failed to remove gpe handler\n"); clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); } static int acpi_ec_add(struct acpi_device *device) { struct acpi_ec *ec = NULL; int ret; strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_EC_CLASS); /* Check for boot EC */ if (boot_ec && (boot_ec->handle == device->handle || boot_ec->handle == ACPI_ROOT_OBJECT)) { ec = boot_ec; boot_ec = NULL; } else { ec = make_acpi_ec(); if (!ec) return -ENOMEM; } if (ec_parse_device(device->handle, 0, ec, NULL) != AE_CTRL_TERMINATE) { kfree(ec); return -EINVAL; } /* Find and register all query methods */ acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, acpi_ec_register_query_methods, NULL, ec, NULL); if (!first_ec) first_ec = ec; device->driver_data = ec; ret = !!request_region(ec->data_addr, 1, "EC data"); WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); ret = !!request_region(ec->command_addr, 1, "EC cmd"); WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", ec->gpe, ec->command_addr, ec->data_addr); ret = ec_install_handlers(ec); /* EC is fully operational, allow queries */ clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); /* Clear stale _Q events if hardware might require that */ if (EC_FLAGS_CLEAR_ON_RESUME) { mutex_lock(&ec->mutex); acpi_ec_clear(ec); mutex_unlock(&ec->mutex); } return ret; } static int acpi_ec_remove(struct acpi_device *device) { struct acpi_ec *ec; struct acpi_ec_query_handler *handler, *tmp; if (!device) return -EINVAL; ec = acpi_driver_data(device); ec_remove_handlers(ec); mutex_lock(&ec->mutex); list_for_each_entry_safe(handler, tmp, &ec->list, node) { list_del(&handler->node); kfree(handler); } mutex_unlock(&ec->mutex); release_region(ec->data_addr, 1); release_region(ec->command_addr, 1); device->driver_data = NULL; if (ec == first_ec) first_ec = NULL; kfree(ec); return 0; } static acpi_status ec_parse_io_ports(struct acpi_resource *resource, void *context) { struct acpi_ec *ec = context; if (resource->type != ACPI_RESOURCE_TYPE_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 == 0) ec->data_addr = resource->data.io.minimum; else if (ec->command_addr == 0) ec->command_addr = resource->data.io.minimum; else return AE_CTRL_TERMINATE; return AE_OK; } int __init acpi_boot_ec_enable(void) { if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) return 0; if (!ec_install_handlers(boot_ec)) { first_ec = boot_ec; return 0; } return -EFAULT; } static const struct acpi_device_id ec_device_ids[] = { {"PNP0C09", 0}, {"", 0}, }; /* Some BIOS do not survive early DSDT scan, skip it */ static int ec_skip_dsdt_scan(const struct dmi_system_id *id) { EC_FLAGS_SKIP_DSDT_SCAN = 1; return 0; } /* ASUStek often supplies us with broken ECDT, validate it */ static int ec_validate_ecdt(const struct dmi_system_id *id) { EC_FLAGS_VALIDATE_ECDT = 1; return 0; } /* MSI EC needs special treatment, enable it */ static int ec_flag_msi(const struct dmi_system_id *id) { printk(KERN_DEBUG PREFIX "Detected MSI hardware, enabling workarounds.\n"); EC_FLAGS_MSI = 1; EC_FLAGS_VALIDATE_ECDT = 1; return 0; } /* * Clevo M720 notebook actually works ok with IRQ mode, if we lifted * the GPE storm threshold back to 20 */ static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) { pr_debug("Setting the EC GPE storm threshold to 20\n"); ec_storm_threshold = 20; return 0; } /* * On some hardware it is necessary to clear events accumulated by the EC during * sleep. These ECs stop reporting GPEs until they are manually polled, if too * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) * * https://bugzilla.kernel.org/show_bug.cgi?id=44161 * * Ideally, the EC should also be instructed NOT to accumulate events during * sleep (which Windows seems to do somehow), but the interface to control this * behaviour is not known at this time. * * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, * however it is very likely that other Samsung models are affected. * * On systems which don't accumulate _Q events during sleep, this extra check * should be harmless. */ static int ec_clear_on_resume(const struct dmi_system_id *id) { pr_debug("Detected system needing EC poll on resume.\n"); EC_FLAGS_CLEAR_ON_RESUME = 1; return 0; } static struct dmi_system_id ec_dmi_table[] __initdata = { { ec_skip_dsdt_scan, "Compal JFL92", { DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, { ec_flag_msi, "MSI hardware", { DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, { ec_flag_msi, "MSI hardware", { DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, { ec_flag_msi, "MSI hardware", { DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, { ec_flag_msi, "MSI hardware", { DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, { ec_flag_msi, "Quanta hardware", { DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, { ec_flag_msi, "Quanta hardware", { DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, { ec_validate_ecdt, "ASUS hardware", { DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, { ec_validate_ecdt, "ASUS hardware", { DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, { ec_enlarge_storm_threshold, "CLEVO hardware", { DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, { ec_skip_dsdt_scan, "HP Folio 13", { DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, { ec_validate_ecdt, "ASUS hardware", { DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, { ec_clear_on_resume, "Samsung hardware", { DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, {}, }; int __init acpi_ec_ecdt_probe(void) { acpi_status status; struct acpi_ec *saved_ec = NULL; struct acpi_table_ecdt *ecdt_ptr; boot_ec = make_acpi_ec(); if (!boot_ec) return -ENOMEM; /* * Generate a boot ec context */ dmi_check_system(ec_dmi_table); status = acpi_get_table(ACPI_SIG_ECDT, 1, (struct acpi_table_header **)&ecdt_ptr); if (ACPI_SUCCESS(status)) { pr_info(PREFIX "EC description table is found, configuring boot EC\n"); boot_ec->command_addr = ecdt_ptr->control.address; boot_ec->data_addr = ecdt_ptr->data.address; boot_ec->gpe = ecdt_ptr->gpe; boot_ec->handle = ACPI_ROOT_OBJECT; acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); /* Don't trust ECDT, which comes from ASUSTek */ if (!EC_FLAGS_VALIDATE_ECDT) goto install; saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); if (!saved_ec) return -ENOMEM; /* fall through */ } if (EC_FLAGS_SKIP_DSDT_SCAN) return -ENODEV; /* This workaround is needed only on some broken machines, * which require early EC, but fail to provide ECDT */ printk(KERN_DEBUG PREFIX "Look up EC in DSDT\n"); status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, boot_ec, NULL); /* Check that acpi_get_devices actually find something */ if (ACPI_FAILURE(status) || !boot_ec->handle) goto error; if (saved_ec) { /* try to find good ECDT from ASUSTek */ if (saved_ec->command_addr != boot_ec->command_addr || saved_ec->data_addr != boot_ec->data_addr || saved_ec->gpe != boot_ec->gpe || saved_ec->handle != boot_ec->handle) pr_info(PREFIX "ASUSTek keeps feeding us with broken " "ECDT tables, which are very hard to workaround. " "Trying to use DSDT EC info instead. Please send " "output of acpidump to linux-acpi@vger.kernel.org\n"); kfree(saved_ec); saved_ec = NULL; } else { /* We really need to limit this workaround, the only ASUS, * which needs it, has fake EC._INI method, so use it as flag. * Keep boot_ec struct as it will be needed soon. */ if (!dmi_name_in_vendors("ASUS") || !acpi_has_method(boot_ec->handle, "_INI")) return -ENODEV; } install: if (!ec_install_handlers(boot_ec)) { first_ec = boot_ec; return 0; } error: kfree(boot_ec); boot_ec = NULL; return -ENODEV; } static struct acpi_driver acpi_ec_driver = { .name = "ec", .class = ACPI_EC_CLASS, .ids = ec_device_ids, .ops = { .add = acpi_ec_add, .remove = acpi_ec_remove, }, }; int __init acpi_ec_init(void) { int result = 0; /* Now register the driver for the EC */ result = acpi_bus_register_driver(&acpi_ec_driver); if (result < 0) return -ENODEV; return result; } /* EC driver currently not unloadable */ #if 0 static void __exit acpi_ec_exit(void) { acpi_bus_unregister_driver(&acpi_ec_driver); return; } #endif /* 0 */