| /* |
| * ec.c - ACPI Embedded Controller Driver (v2.1) |
| * |
| * Copyright (C) 2006-2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
| * Copyright (C) 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
| * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> |
| * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * 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 <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/delay.h> |
| #include <linux/interrupt.h> |
| #include <linux/list.h> |
| #include <linux/spinlock.h> |
| #include <linux/slab.h> |
| #include <asm/io.h> |
| #include <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.h> |
| #include <linux/dmi.h> |
| |
| #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 */ |
| |
| 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 */ |
| |
| /* -------------------------------------------------------------------------- |
| 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); |
| |
| 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); |
| 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); |
| 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; |
| } |
| |
| static struct dmi_system_id __initdata ec_dmi_table[] = { |
| { |
| 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}, |
| {}, |
| }; |
| |
| 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. |
| */ |
| acpi_handle dummy; |
| if (!dmi_name_in_vendors("ASUS") || |
| ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", |
| &dummy))) |
| 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 */ |