/*
- * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
+ * 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>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
+/* Uncomment next line to get verbose printout */
+/* #define DEBUG */
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.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 _COMPONENT ACPI_EC_COMPONENT
-ACPI_MODULE_NAME("ec");
-#define ACPI_EC_COMPONENT 0x00100000
#define ACPI_EC_CLASS "embedded_controller"
-#define ACPI_EC_HID "PNP0C09"
#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_BURST_DISABLE = 0x83,
ACPI_EC_COMMAND_QUERY = 0x84,
};
-/* EC events */
-enum ec_event {
- ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
- ACPI_EC_EVENT_IBF_0, /* Input buffer empty */
-};
#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 */
+};
-static enum ec_mode {
- EC_INTR = 1, /* Output buffer full */
- EC_POLL, /* Input buffer empty */
-} acpi_ec_mode = EC_INTR;
+/* 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);
-static int acpi_ec_remove(struct acpi_device *device, int type);
-static int acpi_ec_start(struct acpi_device *device);
-static int acpi_ec_stop(struct acpi_device *device, int type);
-static int acpi_ec_add(struct acpi_device *device);
+struct acpi_ec_query_handler {
+ struct list_head node;
+ acpi_ec_query_func func;
+ acpi_handle handle;
+ void *data;
+ u8 query_bit;
+};
-static struct acpi_driver acpi_ec_driver = {
- .name = "ec",
- .class = ACPI_EC_CLASS,
- .ids = ACPI_EC_HID,
- .ops = {
- .add = acpi_ec_add,
- .remove = acpi_ec_remove,
- .start = acpi_ec_start,
- .stop = acpi_ec_stop,
- },
+struct transaction {
+ const u8 *wdata;
+ u8 *rdata;
+ unsigned short irq_count;
+ u8 command;
+ u8 wi;
+ u8 ri;
+ u8 wlen;
+ u8 rlen;
+ bool done;
};
-/* If we find an EC via the ECDT, we need to keep a ptr to its context */
static struct acpi_ec {
acpi_handle handle;
- unsigned long uid;
unsigned long gpe;
unsigned long command_addr;
unsigned long data_addr;
unsigned long global_lock;
+ unsigned long flags;
struct mutex lock;
- atomic_t query_pending;
- atomic_t event_count;
wait_queue_head_t wait;
-} *ec_ecdt;
+ struct list_head list;
+ struct transaction *curr;
+ spinlock_t curr_lock;
+} *boot_ec, *first_ec;
-/* External interfaces use first EC only, so remember */
-static struct acpi_device *first_ec;
+static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */
/* --------------------------------------------------------------------------
Transaction Management
static inline u8 acpi_ec_read_status(struct acpi_ec *ec)
{
- return inb(ec->command_addr);
+ 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)
{
- return inb(ec->data_addr);
+ 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 inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event,
- unsigned old_count)
+static int ec_transaction_done(struct acpi_ec *ec)
{
- u8 status = acpi_ec_read_status(ec);
- if (old_count == atomic_read(&ec->event_count))
+ 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;
- if (event == ACPI_EC_EVENT_OBF_1) {
- if (status & ACPI_EC_FLAG_OBF)
- return 1;
- } else if (event == ACPI_EC_EVENT_IBF_0) {
- if (!(status & ACPI_EC_FLAG_IBF))
- return 1;
+ /* 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 acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
+static int ec_poll(struct acpi_ec *ec)
{
- if (acpi_ec_mode == EC_POLL) {
- unsigned long delay = jiffies + msecs_to_jiffies(ACPI_EC_DELAY);
- while (time_before(jiffies, delay)) {
- if (acpi_ec_check_status(ec, event, 0))
- return 0;
- }
- } else {
- if (wait_event_timeout(ec->wait,
- acpi_ec_check_status(ec, event, count),
- msecs_to_jiffies(ACPI_EC_DELAY)) ||
- acpi_ec_check_status(ec, event, 0)) {
+ 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;
- } else {
- printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
- " status = %d, expect_event = %d\n",
- acpi_ec_read_status(ec), event);
- }
}
-
return -ETIME;
}
-static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
- const u8 * wdata, unsigned wdata_len,
- u8 * rdata, unsigned rdata_len)
+static int acpi_ec_transaction_unlocked(struct acpi_ec *ec,
+ struct transaction *t,
+ int force_poll)
{
- int result = 0;
- unsigned count = atomic_read(&ec->event_count);
- acpi_ec_write_cmd(ec, command);
-
- for (; wdata_len > 0; --wdata_len) {
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count);
- if (result) {
- printk(KERN_ERR PREFIX
- "write_cmd timeout, command = %d\n", command);
- goto end;
- }
- count = atomic_read(&ec->event_count);
- acpi_ec_write_data(ec, *(wdata++));
+ 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);
}
-
- if (!rdata_len) {
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, count);
- if (result) {
- printk(KERN_ERR PREFIX
- "finish-write timeout, command = %d\n", command);
- goto end;
- }
- } else if (command == ACPI_EC_COMMAND_QUERY) {
- atomic_set(&ec->query_pending, 0);
+ if (EC_FLAGS_MSI)
+ udelay(ACPI_EC_DELAY);
+ /* 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;
+}
- for (; rdata_len > 0; --rdata_len) {
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1, count);
- if (result) {
- printk(KERN_ERR PREFIX "read timeout, command = %d\n",
- command);
- goto end;
- }
- count = atomic_read(&ec->event_count);
- *(rdata++) = acpi_ec_read_data(ec);
- }
- end:
- return result;
+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, u8 command,
- const u8 * wdata, unsigned wdata_len,
- u8 * rdata, unsigned rdata_len)
+static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
+ int force_poll)
{
int status;
u32 glk;
-
- if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
+ if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata))
return -EINVAL;
-
- if (rdata)
- memset(rdata, 0, rdata_len);
-
+ 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)) {
- mutex_unlock(&ec->lock);
- return -ENODEV;
+ status = -ENODEV;
+ goto unlock;
}
}
-
- /* Make sure GPE is enabled before doing transaction */
- acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
-
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
- if (status) {
- printk(KERN_DEBUG PREFIX
- "input buffer is not empty, aborting transaction\n");
+ 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, command,
- wdata, wdata_len,
- rdata, rdata_len);
-
- 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)
+static int acpi_ec_burst_enable(struct acpi_ec *ec)
{
u8 d;
- return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1);
+ 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)
+static int acpi_ec_burst_disable(struct acpi_ec *ec)
{
- return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0);
+ 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, ACPI_EC_COMMAND_READ,
- &address, 1, &d, 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 };
- return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
- wdata, 2, NULL, 0);
+ struct transaction t = {.command = ACPI_EC_COMMAND_WRITE,
+ .wdata = wdata, .rdata = NULL,
+ .wlen = 2, .rlen = 0};
+
+ return acpi_ec_transaction(ec, &t, 0);
}
/*
*/
int ec_burst_enable(void)
{
- struct acpi_ec *ec;
if (!first_ec)
return -ENODEV;
- ec = acpi_driver_data(first_ec);
- return acpi_ec_burst_enable(ec);
+ return acpi_ec_burst_enable(first_ec);
}
EXPORT_SYMBOL(ec_burst_enable);
int ec_burst_disable(void)
{
- struct acpi_ec *ec;
if (!first_ec)
return -ENODEV;
- ec = acpi_driver_data(first_ec);
- return acpi_ec_burst_disable(ec);
+ return acpi_ec_burst_disable(first_ec);
}
EXPORT_SYMBOL(ec_burst_disable);
int ec_read(u8 addr, u8 * val)
{
- struct acpi_ec *ec;
int err;
u8 temp_data;
if (!first_ec)
return -ENODEV;
- ec = acpi_driver_data(first_ec);
-
- err = acpi_ec_read(ec, addr, &temp_data);
+ err = acpi_ec_read(first_ec, addr, &temp_data);
if (!err) {
*val = temp_data;
int ec_write(u8 addr, u8 val)
{
- struct acpi_ec *ec;
int err;
if (!first_ec)
return -ENODEV;
- ec = acpi_driver_data(first_ec);
-
- err = acpi_ec_write(ec, addr, val);
+ err = acpi_ec_write(first_ec, addr, val);
return err;
}
int ec_transaction(u8 command,
const u8 * wdata, unsigned wdata_len,
- u8 * rdata, unsigned rdata_len)
+ u8 * rdata, unsigned rdata_len,
+ int force_poll)
{
- struct acpi_ec *ec;
-
+ struct transaction t = {.command = command,
+ .wdata = wdata, .rdata = rdata,
+ .wlen = wdata_len, .rlen = rdata_len};
if (!first_ec)
return -ENODEV;
- ec = acpi_driver_data(first_ec);
-
- return acpi_ec_transaction(ec, command, wdata,
- wdata_len, rdata, rdata_len);
+ return acpi_ec_transaction(first_ec, &t, force_poll);
}
EXPORT_SYMBOL(ec_transaction);
{
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;
* bit to be cleared (and thus clearing the interrupt source).
*/
- result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
+ result = acpi_ec_transaction(ec, &t, 0);
if (result)
return result;
/* --------------------------------------------------------------------------
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;
- char object_name[8];
+ struct acpi_ec_query_handler *handler, copy;
if (!ec || acpi_ec_query(ec, &value))
return;
-
- snprintf(object_name, 8, "_Q%2.2X", value);
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name));
-
- acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
+ 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)
{
- acpi_status status = AE_OK;
- u8 value;
struct acpi_ec *ec = data;
- atomic_inc(&ec->event_count);
+ u8 status;
- if (acpi_ec_mode == EC_INTR) {
- wake_up(&ec->wait);
- }
+ pr_debug(PREFIX "~~~> interrupt\n");
+ status = acpi_ec_read_status(ec);
- value = acpi_ec_read_status(ec);
- if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) {
- atomic_set(&ec->query_pending, 1);
- status =
- acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query,
- 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);
}
- return status == AE_OK ?
- ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
+ 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;
}
/* --------------------------------------------------------------------------
-------------------------------------------------------------------------- */
static acpi_status
-acpi_ec_space_setup(acpi_handle region_handle,
- u32 function, void *handler_context, void **return_context)
-{
- /*
- * The EC object is in the handler context and is needed
- * when calling the acpi_ec_space_handler.
- */
- *return_context = (function != ACPI_REGION_DEACTIVATE) ?
- handler_context : NULL;
-
- return AE_OK;
-}
-
-static acpi_status
-acpi_ec_space_handler(u32 function,
- acpi_physical_address address,
- u32 bit_width,
- acpi_integer * value,
+acpi_ec_space_handler(u32 function, acpi_physical_address address,
+ u32 bits, acpi_integer *value,
void *handler_context, void *region_context)
{
- int result = 0;
struct acpi_ec *ec = handler_context;
- u64 temp = *value;
- acpi_integer f_v = 0;
- int i = 0;
+ int result = 0, i;
+ u8 temp = 0;
if ((address > 0xFF) || !value || !handler_context)
return AE_BAD_PARAMETER;
- if (bit_width != 8 && acpi_strict) {
+ if (function != ACPI_READ && function != ACPI_WRITE)
return AE_BAD_PARAMETER;
- }
- next_byte:
- switch (function) {
- case ACPI_READ:
- temp = 0;
- result = acpi_ec_read(ec, (u8) address, (u8 *) & temp);
- break;
- case ACPI_WRITE:
- result = acpi_ec_write(ec, (u8) address, (u8) temp);
- break;
- default:
- result = -EINVAL;
- goto out;
- break;
- }
+ if (bits != 8 && acpi_strict)
+ return AE_BAD_PARAMETER;
- bit_width -= 8;
- if (bit_width) {
- if (function == ACPI_READ)
- f_v |= temp << 8 * i;
- if (function == ACPI_WRITE)
- temp >>= 8;
- i++;
- address++;
- goto next_byte;
- }
+ acpi_ec_burst_enable(ec);
if (function == ACPI_READ) {
- f_v |= temp << 8 * i;
- *value = f_v;
+ 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);
+ }
}
- out:
+ acpi_ec_burst_disable(ec);
+
switch (result) {
case -EINVAL:
return AE_BAD_PARAMETER;
if (!ec)
goto end;
- seq_printf(seq, "gpe: 0x%02x\n", (u32) ec->gpe);
- seq_printf(seq, "ports: 0x%02x, 0x%02x\n",
- (u32) ec->command_addr, (u32) ec->data_addr);
- seq_printf(seq, "use global lock: %s\n",
+ 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");
- acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
-
end:
return 0;
}
return -ENODEV;
}
- entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
- acpi_device_dir(device));
+ 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;
- else {
- entry->proc_fops = &acpi_ec_info_ops;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
-
return 0;
}
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
+static acpi_status
+ec_parse_io_ports(struct acpi_resource *resource, void *context);
-static int acpi_ec_add(struct acpi_device *device)
+static struct acpi_ec *make_acpi_ec(void)
{
- int result = 0;
- acpi_status status = AE_OK;
- struct acpi_ec *ec = NULL;
+ 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;
+}
- if (!device)
- return -EINVAL;
+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;
- ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
- if (!ec)
- return -ENOMEM;
+ status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
- ec->handle = device->handle;
- ec->uid = -1;
- mutex_init(&ec->lock);
- atomic_set(&ec->query_pending, 0);
- atomic_set(&ec->event_count, 1);
- if (acpi_ec_mode == EC_INTR) {
- init_waitqueue_head(&ec->wait);
+ if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) {
+ acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
}
- strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
- strcpy(acpi_device_class(device), ACPI_EC_CLASS);
- acpi_driver_data(device) = ec;
+ 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? */
- acpi_evaluate_integer(ec->handle, "_GLK", NULL, &ec->global_lock);
+ tmp = 0;
+ acpi_evaluate_integer(handle, "_GLK", NULL, &tmp);
+ ec->global_lock = tmp;
+ ec->handle = handle;
+ return AE_CTRL_TERMINATE;
+}
- /* XXX we don't test uids, because on some boxes ecdt uid = 0, see:
- http://bugzilla.kernel.org/show_bug.cgi?id=6111 */
- if (ec_ecdt) {
- acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
- ACPI_ADR_SPACE_EC,
- &acpi_ec_space_handler);
+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);
+}
- acpi_remove_gpe_handler(NULL, ec_ecdt->gpe,
- &acpi_ec_gpe_handler);
+static int acpi_ec_add(struct acpi_device *device)
+{
+ struct acpi_ec *ec = NULL;
- kfree(ec_ecdt);
- }
+ if (!device)
+ return -EINVAL;
+ strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_EC_CLASS);
- /* Get GPE bit assignment (EC events). */
- /* TODO: Add support for _GPE returning a package */
- status = acpi_evaluate_integer(ec->handle, "_GPE", NULL, &ec->gpe);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status,
- "Obtaining GPE bit assignment"));
- result = -ENODEV;
- goto end;
+ /* 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;
+ }
}
- result = acpi_ec_add_fs(device);
- if (result)
- goto end;
+ ec->handle = device->handle;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.",
- acpi_device_name(device), acpi_device_bid(device),
- (u32) ec->gpe));
+ /* 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 = device;
-
- end:
- if (result)
- kfree(ec);
-
- return result;
+ 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 = NULL;
+ 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
-acpi_ec_io_ports(struct acpi_resource *resource, void *context)
+ec_parse_io_ports(struct acpi_resource *resource, void *context)
{
struct acpi_ec *ec = context;
- if (resource->type != ACPI_RESOURCE_TYPE_IO) {
+ 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) {
+ if (ec->data_addr == 0)
ec->data_addr = resource->data.io.minimum;
- } else if (ec->command_addr == 0) {
+ else if (ec->command_addr == 0)
ec->command_addr = resource->data.io.minimum;
- } else {
+ else
return AE_CTRL_TERMINATE;
- }
return AE_OK;
}
static int ec_install_handlers(struct acpi_ec *ec)
{
- acpi_status status = acpi_install_gpe_handler(NULL, ec->gpe,
- ACPI_GPE_EDGE_TRIGGERED,
- &acpi_ec_gpe_handler, 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, ACPI_NOT_ISR);
-
+ acpi_enable_gpe(NULL, ec->gpe);
status = acpi_install_address_space_handler(ec->handle,
ACPI_ADR_SPACE_EC,
&acpi_ec_space_handler,
- &acpi_ec_space_setup, ec);
+ NULL, ec);
if (ACPI_FAILURE(status)) {
- acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
- return -ENODEV;
+ 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)
{
- acpi_status status = AE_OK;
- struct acpi_ec *ec = NULL;
+ struct acpi_ec *ec;
+ int ret = 0;
if (!device)
return -EINVAL;
if (!ec)
return -EINVAL;
- /*
- * Get I/O port addresses. Convert to GAS format.
- */
- status = acpi_walk_resources(ec->handle, METHOD_NAME__CRS,
- acpi_ec_io_ports, ec);
- if (ACPI_FAILURE(status) || ec->command_addr == 0) {
- ACPI_EXCEPTION((AE_INFO, status,
- "Error getting I/O port addresses"));
- return -ENODEV;
- }
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02lx, ports=0x%2lx,0x%2lx",
- ec->gpe, ec->command_addr, ec->data_addr));
+ ret = ec_install_handlers(ec);
- return 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)
{
- acpi_status status = AE_OK;
- struct acpi_ec *ec = NULL;
-
+ struct acpi_ec *ec;
if (!device)
return -EINVAL;
-
ec = acpi_driver_data(device);
-
- status = acpi_remove_address_space_handler(ec->handle,
- ACPI_ADR_SPACE_EC,
- &acpi_ec_space_handler);
- if (ACPI_FAILURE(status))
- return -ENODEV;
-
- status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
- if (ACPI_FAILURE(status))
- return -ENODEV;
+ if (!ec)
+ return -EINVAL;
+ ec_remove_handlers(ec);
return 0;
}
-static int __init acpi_ec_get_real_ecdt(void)
+int __init acpi_boot_ec_enable(void)
{
- acpi_status status;
- struct acpi_table_ecdt *ecdt_ptr;
+ 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;
+}
- status = acpi_get_table(ACPI_SIG_ECDT, 1,
- (struct acpi_table_header **)&ecdt_ptr);
- if (ACPI_FAILURE(status))
- return -ENODEV;
+static const struct acpi_device_id ec_device_ids[] = {
+ {"PNP0C09", 0},
+ {"", 0},
+};
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
+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 temporary ec context to use until the namespace is scanned
+ * Generate a boot ec context
*/
- ec_ecdt = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
- if (!ec_ecdt)
- return -ENOMEM;
-
- mutex_init(&ec_ecdt->lock);
- atomic_set(&ec_ecdt->event_count, 1);
- if (acpi_ec_mode == EC_INTR) {
- init_waitqueue_head(&ec_ecdt->wait);
+ if (dmi_name_in_vendors("Micro-Star") ||
+ dmi_name_in_vendors("Notebook")) {
+ pr_info(PREFIX "Enabling special treatment for EC from MSI.\n");
+ EC_FLAGS_MSI = 1;
+ }
+ 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 (!dmi_name_in_vendors("ASUS"))
+ goto install;
+ saved_ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+ if (!saved_ec)
+ return -ENOMEM;
+ memcpy(saved_ec, boot_ec, sizeof(*saved_ec));
+ /* fall through */
+ }
+ /* 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;
}
- ec_ecdt->command_addr = ecdt_ptr->control.address;
- ec_ecdt->data_addr = ecdt_ptr->data.address;
- ec_ecdt->gpe = ecdt_ptr->gpe;
- ec_ecdt->uid = ecdt_ptr->uid;
+install:
+ if (!ec_install_handlers(boot_ec)) {
+ first_ec = boot_ec;
+ return 0;
+ }
+error:
+ kfree(boot_ec);
+ boot_ec = NULL;
+ return -ENODEV;
+}
- ec_ecdt->handle = ACPI_ROOT_OBJECT;
+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;
}
-int __init acpi_ec_ecdt_probe(void)
+static int acpi_ec_resume(struct acpi_device *device)
{
- int ret;
-
- ret = acpi_ec_get_real_ecdt();
- if (ret)
- return 0;
-
- ret = ec_install_handlers(ec_ecdt);
- if (!ret)
- return 0;
-
- kfree(ec_ecdt);
- ec_ecdt = NULL;
-
- return -ENODEV;
+ 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;
return;
}
-#endif /* 0 */
-
-static int __init acpi_ec_set_intr_mode(char *str)
-{
- int intr;
-
- if (!get_option(&str, &intr))
- return 0;
-
- if (intr) {
- acpi_ec_mode = EC_INTR;
- } else {
- acpi_ec_mode = EC_POLL;
- }
- acpi_ec_driver.ops.add = acpi_ec_add;
- printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling");
-
- return 1;
-}
-
-__setup("ec_intr=", acpi_ec_set_intr_mode);
+#endif /* 0 */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff