diff options
Diffstat (limited to 'drivers/acpi/ec.c')
| -rw-r--r-- | drivers/acpi/ec.c | 1106 |
1 files changed, 1106 insertions, 0 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c new file mode 100644 index 0000000..4aa9477 --- /dev/null +++ b/drivers/acpi/ec.c @@ -0,0 +1,1106 @@ +/* + * 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/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <asm/io.h> +#include <acpi/acpi_bus.h> +#include <acpi/acpi_drivers.h> +#include <acpi/actypes.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_UDELAY 100 /* Wait 100us before polling EC again */ + +#define ACPI_EC_STORM_THRESHOLD 8 /* number of false interrupts + per one transaction */ + +enum { + EC_FLAGS_QUERY_PENDING, /* Query is pending */ + EC_FLAGS_GPE_MODE, /* Expect GPE to be sent + * for status change */ + EC_FLAGS_NO_GPE, /* Don't use GPE mode */ + EC_FLAGS_GPE_STORM, /* GPE storm detected */ + EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and + * OpReg are installed */ +}; + +/* 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; +}; + +static struct acpi_ec { + acpi_handle handle; + unsigned long gpe; + unsigned long command_addr; + unsigned long data_addr; + unsigned long global_lock; + unsigned long flags; + struct mutex lock; + wait_queue_head_t wait; + struct list_head list; + struct transaction *curr; + spinlock_t curr_lock; +} *boot_ec, *first_ec; + +/* + * Some Asus system have exchanged ECDT data/command IO addresses. + */ +static int print_ecdt_error(const struct dmi_system_id *id) +{ + printk(KERN_NOTICE PREFIX "%s detected - " + "ECDT has exchanged control/data I/O address\n", + id->ident); + return 0; +} + +static struct dmi_system_id __cpuinitdata ec_dmi_table[] = { + { + print_ecdt_error, "Asus L4R", { + DMI_MATCH(DMI_BIOS_VERSION, "1008.006"), + DMI_MATCH(DMI_PRODUCT_NAME, "L4R"), + DMI_MATCH(DMI_BOARD_NAME, "L4R") }, NULL}, + { + print_ecdt_error, "Asus M6R", { + DMI_MATCH(DMI_BIOS_VERSION, "0207"), + DMI_MATCH(DMI_PRODUCT_NAME, "M6R"), + DMI_MATCH(DMI_BOARD_NAME, "M6R") }, NULL}, + {}, +}; + +/* -------------------------------------------------------------------------- + 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->curr_lock, flags); + if (!ec->curr || ec->curr->done) + ret = 1; + spin_unlock_irqrestore(&ec->curr_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 gpe_transaction(struct acpi_ec *ec, u8 status) +{ + unsigned long flags; + spin_lock_irqsave(&ec->curr_lock, flags); + if (!ec->curr) + goto unlock; + if (ec->curr->wlen > ec->curr->wi) { + if ((status & ACPI_EC_FLAG_IBF) == 0) + acpi_ec_write_data(ec, + ec->curr->wdata[ec->curr->wi++]); + else + goto err; + } else if (ec->curr->rlen > ec->curr->ri) { + if ((status & ACPI_EC_FLAG_OBF) == 1) { + ec->curr->rdata[ec->curr->ri++] = acpi_ec_read_data(ec); + if (ec->curr->rlen == ec->curr->ri) + ec->curr->done = true; + } else + goto err; + } else if (ec->curr->wlen == ec->curr->wi && + (status & ACPI_EC_FLAG_IBF) == 0) + ec->curr->done = true; + goto unlock; +err: + /* false interrupt, state didn't change */ + if (in_interrupt()) + ++ec->curr->irq_count; +unlock: + spin_unlock_irqrestore(&ec->curr_lock, flags); +} + +static int acpi_ec_wait(struct acpi_ec *ec) +{ + if (wait_event_timeout(ec->wait, ec_transaction_done(ec), + msecs_to_jiffies(ACPI_EC_DELAY))) + return 0; + /* try restart command if we get any false interrupts */ + if (ec->curr->irq_count && + (acpi_ec_read_status(ec) & ACPI_EC_FLAG_IBF) == 0) { + pr_debug(PREFIX "controller reset, restart transaction\n"); + start_transaction(ec); + if (wait_event_timeout(ec->wait, ec_transaction_done(ec), + msecs_to_jiffies(ACPI_EC_DELAY))) + return 0; + } + /* missing GPEs, switch back to poll mode */ + if (printk_ratelimit()) + pr_info(PREFIX "missing confirmations, " + "switch off interrupt mode.\n"); + set_bit(EC_FLAGS_NO_GPE, &ec->flags); + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); + return 1; +} + +static void acpi_ec_gpe_query(void *ec_cxt); + +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)) + return acpi_os_execute(OSL_EC_BURST_HANDLER, + acpi_ec_gpe_query, ec); + } + return 0; +} + +static int ec_poll(struct acpi_ec *ec) +{ + unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY); + udelay(ACPI_EC_UDELAY); + while (time_before(jiffies, delay)) { + gpe_transaction(ec, acpi_ec_read_status(ec)); + udelay(ACPI_EC_UDELAY); + if (ec_transaction_done(ec)) + return 0; + } + return -ETIME; +} + +static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, + struct transaction *t, + int force_poll) +{ + unsigned long tmp; + int ret = 0; + pr_debug(PREFIX "transaction start\n"); + /* disable GPE during transaction if storm is detected */ + if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); + acpi_disable_gpe(NULL, ec->gpe); + } + /* start transaction */ + spin_lock_irqsave(&ec->curr_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->curr_lock, tmp); + /* if we selected poll mode or failed in GPE-mode do a poll loop */ + if (force_poll || + !test_bit(EC_FLAGS_GPE_MODE, &ec->flags) || + acpi_ec_wait(ec)) + ret = ec_poll(ec); + pr_debug(PREFIX "transaction end\n"); + spin_lock_irqsave(&ec->curr_lock, tmp); + ec->curr = NULL; + spin_unlock_irqrestore(&ec->curr_lock, tmp); + if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { + /* check if we received SCI during transaction */ + ec_check_sci(ec, acpi_ec_read_status(ec)); + /* it is safe to enable GPE outside of transaction */ + acpi_enable_gpe(NULL, ec->gpe); + } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && + t->irq_count > ACPI_EC_STORM_THRESHOLD) { + pr_info(PREFIX "GPE storm detected, " + "transactions will use polling mode\n"); + set_bit(EC_FLAGS_GPE_STORM, &ec->flags); + } + 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(ACPI_EC_DELAY); + /* interrupt wait manually if GPE mode is not active */ + unsigned long timeout = test_bit(EC_FLAGS_GPE_MODE, &ec->flags) ? + msecs_to_jiffies(ACPI_EC_DELAY) : msecs_to_jiffies(1); + while (time_before(jiffies, delay)) + if (wait_event_timeout(ec->wait, ec_check_ibf0(ec), timeout)) + return 0; + return -ETIME; +} + +static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t, + int force_poll) +{ + 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->lock); + 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; + } + status = acpi_ec_transaction_unlocked(ec, t, force_poll); +end: + if (ec->global_lock) + acpi_release_global_lock(glk); +unlock: + mutex_unlock(&ec->lock); + return status; +} + +/* + * Note: samsung nv5000 doesn't work with ec burst mode. + * http://bugzilla.kernel.org/show_bug.cgi?id=4980 + */ +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, 0); +} + +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) : 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, 0); + *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, 0); +} + +/* + * 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, + int force_poll) +{ + 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, force_poll); +} + +EXPORT_SYMBOL(ec_transaction); + +static int acpi_ec_query(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(ec, &t, 0); + 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->lock); + list_add(&handler->node, &ec->list); + mutex_unlock(&ec->lock); + 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->lock); + 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->lock); +} + +EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); + +static void acpi_ec_gpe_query(void *ec_cxt) +{ + struct acpi_ec *ec = ec_cxt; + u8 value = 0; + struct acpi_ec_query_handler *handler, copy; + + if (!ec || acpi_ec_query(ec, &value)) + return; + mutex_lock(&ec->lock); + list_for_each_entry(handler, &ec->list, node) { + if (value == handler->query_bit) { + /* have custom handler for this bit */ + memcpy(©, handler, sizeof(copy)); + mutex_unlock(&ec->lock); + if (copy.func) { + copy.func(copy.data); + } else if (copy.handle) { + acpi_evaluate_object(copy.handle, NULL, NULL, NULL); + } + return; + } + } + mutex_unlock(&ec->lock); +} + +static u32 acpi_ec_gpe_handler(void *data) +{ + struct acpi_ec *ec = data; + u8 status; + + pr_debug(PREFIX "~~~> interrupt\n"); + status = acpi_ec_read_status(ec); + + if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags)) { + gpe_transaction(ec, status); + if (ec_transaction_done(ec) && + (status & ACPI_EC_FLAG_IBF) == 0) + wake_up(&ec->wait); + } + + ec_check_sci(ec, status); + if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && + !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { + /* this is non-query, must be confirmation */ + if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { + if (printk_ratelimit()) + pr_info(PREFIX "non-query interrupt received," + " switching to interrupt mode\n"); + } else { + /* hush, STORM switches the mode every transaction */ + pr_debug(PREFIX "non-query interrupt received," + " switching to interrupt mode\n"); + } + set_bit(EC_FLAGS_GPE_MODE, &ec->flags); + } + return ACPI_INTERRUPT_HANDLED; +} + +/* -------------------------------------------------------------------------- + Address Space Management + -------------------------------------------------------------------------- */ + +static acpi_status +acpi_ec_space_handler(u32 function, acpi_physical_address address, + u32 bits, acpi_integer *value, + void *handler_context, void *region_context) +{ + struct acpi_ec *ec = handler_context; + int result = 0, i; + u8 temp = 0; + + if ((address > 0xFF) || !value || !handler_context) + return AE_BAD_PARAMETER; + + if (function != ACPI_READ && function != ACPI_WRITE) + return AE_BAD_PARAMETER; + + if (bits != 8 && acpi_strict) + return AE_BAD_PARAMETER; + + acpi_ec_burst_enable(ec); + + if (function == ACPI_READ) { + result = acpi_ec_read(ec, address, &temp); + *value = temp; + } else { + temp = 0xff & (*value); + result = acpi_ec_write(ec, address, temp); + } + + for (i = 8; unlikely(bits - i > 0); i += 8) { + ++address; + if (function == ACPI_READ) { + result = acpi_ec_read(ec, address, &temp); + (*value) |= ((acpi_integer)temp) << i; + } else { + temp = 0xff & ((*value) >> i); + result = acpi_ec_write(ec, address, temp); + } + } + + 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; + } +} + +/* -------------------------------------------------------------------------- + FS Interface (/proc) + -------------------------------------------------------------------------- */ + +static struct proc_dir_entry *acpi_ec_dir; + +static int acpi_ec_read_info(struct seq_file *seq, void *offset) +{ + struct acpi_ec *ec = seq->private; + + if (!ec) + goto end; + + seq_printf(seq, "gpe:\t\t\t0x%02x\n", (u32) ec->gpe); + seq_printf(seq, "ports:\t\t\t0x%02x, 0x%02x\n", + (unsigned)ec->command_addr, (unsigned)ec->data_addr); + seq_printf(seq, "use global lock:\t%s\n", + ec->global_lock ? "yes" : "no"); + end: + return 0; +} + +static int acpi_ec_info_open_fs(struct inode *inode, struct file *file) +{ + return single_open(file, acpi_ec_read_info, PDE(inode)->data); +} + +static struct file_operations acpi_ec_info_ops = { + .open = acpi_ec_info_open_fs, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .owner = THIS_MODULE, +}; + +static int acpi_ec_add_fs(struct acpi_device *device) +{ + struct proc_dir_entry *entry = NULL; + + if (!acpi_device_dir(device)) { + acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), + acpi_ec_dir); + if (!acpi_device_dir(device)) + return -ENODEV; + } + + entry = proc_create_data(ACPI_EC_FILE_INFO, S_IRUGO, + acpi_device_dir(device), + &acpi_ec_info_ops, acpi_driver_data(device)); + if (!entry) + return -ENODEV; + return 0; +} + +static int acpi_ec_remove_fs(struct acpi_device *device) +{ + + if (acpi_device_dir(device)) { + remove_proc_entry(ACPI_EC_FILE_INFO, acpi_device_dir(device)); + remove_proc_entry(acpi_device_bid(device), acpi_ec_dir); + acpi_device_dir(device) = NULL; + } + + return 0; +} + +/* -------------------------------------------------------------------------- + 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->lock); + init_waitqueue_head(&ec->wait); + INIT_LIST_HEAD(&ec->list); + spin_lock_init(&ec->curr_lock); + return ec; +} + +static acpi_status +acpi_ec_register_query_methods(acpi_handle handle, u32 level, + void *context, void **return_value) +{ + struct acpi_namespace_node *node = handle; + struct acpi_ec *ec = context; + int value = 0; + + if (sscanf(node->name.ascii, "_Q%2x", &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; + 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 void ec_remove_handlers(struct acpi_ec *ec) +{ + 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; + + if (!device) + return -EINVAL; + 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; + } + } + + ec->handle = device->handle; + + /* Find and register all query methods */ + acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, + acpi_ec_register_query_methods, ec, NULL); + + if (!first_ec) + first_ec = ec; + device->driver_data = ec; + acpi_ec_add_fs(device); + pr_info(PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", + ec->gpe, ec->command_addr, ec->data_addr); + pr_info(PREFIX "driver started in %s mode\n", + (test_bit(EC_FLAGS_GPE_MODE, &ec->flags))?"interrupt":"poll"); + return 0; +} + +static int acpi_ec_remove(struct acpi_device *device, int type) +{ + struct acpi_ec *ec; + struct acpi_ec_query_handler *handler, *tmp; + + if (!device) + return -EINVAL; + + ec = acpi_driver_data(device); + mutex_lock(&ec->lock); + list_for_each_entry_safe(handler, tmp, &ec->list, node) { + list_del(&handler->node); + kfree(handler); + } + mutex_unlock(&ec->lock); + acpi_ec_remove_fs(device); + 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; +} + +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_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME); + 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); + return -ENODEV; + } + } + + set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); + return 0; +} + +static int acpi_ec_start(struct acpi_device *device) +{ + struct acpi_ec *ec; + int ret = 0; + + if (!device) + return -EINVAL; + + ec = acpi_driver_data(device); + + if (!ec) + return -EINVAL; + + 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_stop(struct acpi_device *device, int type) +{ + struct acpi_ec *ec; + if (!device) + return -EINVAL; + ec = acpi_driver_data(device); + if (!ec) + return -EINVAL; + ec_remove_handlers(ec); + + return 0; +} + +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}, +}; + +int __init acpi_ec_ecdt_probe(void) +{ + int ret; + acpi_status status; + struct acpi_table_ecdt *ecdt_ptr; + + boot_ec = make_acpi_ec(); + if (!boot_ec) + return -ENOMEM; + /* + * Generate a boot ec context + */ + 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; + if (dmi_check_system(ec_dmi_table)) { + /* + * If the board falls into ec_dmi_table, it means + * that ECDT table gives the incorrect command/status + * & data I/O address. Just fix it. + */ + boot_ec->data_addr = ecdt_ptr->control.address; + boot_ec->command_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); + } else { + /* This workaround is needed only on some broken machines, + * which require early EC, but fail to provide ECDT */ + acpi_handle x; + 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; + /* 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 (ACPI_FAILURE(acpi_get_handle(boot_ec->handle, "_INI", &x))) + return -ENODEV; + } + + ret = ec_install_handlers(boot_ec); + if (!ret) { + first_ec = boot_ec; + return 0; + } + error: + kfree(boot_ec); + boot_ec = NULL; + return -ENODEV; +} + +static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state) +{ + struct acpi_ec *ec = acpi_driver_data(device); + /* Stop using GPE */ + set_bit(EC_FLAGS_NO_GPE, &ec->flags); + clear_bit(EC_FLAGS_GPE_MODE, &ec->flags); + acpi_disable_gpe(NULL, ec->gpe); + return 0; +} + +static int acpi_ec_resume(struct acpi_device *device) +{ + struct acpi_ec *ec = acpi_driver_data(device); + /* Enable use of GPE back */ + clear_bit(EC_FLAGS_NO_GPE, &ec->flags); + acpi_enable_gpe(NULL, ec->gpe); + return 0; +} + +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, + .start = acpi_ec_start, + .stop = acpi_ec_stop, + .suspend = acpi_ec_suspend, + .resume = acpi_ec_resume, + }, +}; + +static int __init acpi_ec_init(void) +{ + int result = 0; + + if (acpi_disabled) + return 0; + + acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir); + if (!acpi_ec_dir) + return -ENODEV; + + /* Now register the driver for the EC */ + result = acpi_bus_register_driver(&acpi_ec_driver); + if (result < 0) { + remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); + return -ENODEV; + } + + return result; +} + +subsys_initcall(acpi_ec_init); + +/* EC driver currently not unloadable */ +#if 0 +static void __exit acpi_ec_exit(void) +{ + + acpi_bus_unregister_driver(&acpi_ec_driver); + + remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir); + + return; +} +#endif /* 0 */ |
