/*
- * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
+ * ec.c - ACPI Embedded Controller Driver (v2.0)
*
+ * Copyright (C) 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
+ * 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>
#include <acpi/actypes.h>
#define _COMPONENT ACPI_EC_COMPONENT
-ACPI_MODULE_NAME("acpi_ec")
+ACPI_MODULE_NAME("ec");
#define ACPI_EC_COMPONENT 0x00100000
#define ACPI_EC_CLASS "embedded_controller"
#define ACPI_EC_HID "PNP0C09"
-#define ACPI_EC_DRIVER_NAME "ACPI Embedded Controller Driver"
#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 */
-#define ACPI_EC_COMMAND_READ 0x80
-#define ACPI_EC_COMMAND_WRITE 0x81
-#define ACPI_EC_BURST_ENABLE 0x82
-#define ACPI_EC_BURST_DISABLE 0x83
-#define ACPI_EC_COMMAND_QUERY 0x84
-
+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,
+};
/* EC events */
-enum {
+enum ec_event {
ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
- ACPI_EC_EVENT_IBF_0, /* Input buffer empty */
+ 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 /* Poll @ 100us increments */
-#define ACPI_EC_UDELAY_COUNT 1000 /* Wait 100ms max. during EC ops */
-enum {
- EC_INTR = 1, /* Output buffer full */
- EC_POLL, /* Input buffer empty */
-};
+static enum ec_mode {
+ EC_INTR = 1, /* Output buffer full */
+ EC_POLL, /* Input buffer empty */
+} acpi_ec_mode = EC_INTR;
static int acpi_ec_remove(struct acpi_device *device, int type);
static int acpi_ec_start(struct acpi_device *device);
static int acpi_ec_add(struct acpi_device *device);
static struct acpi_driver acpi_ec_driver = {
- .name = ACPI_EC_DRIVER_NAME,
+ .name = "ec",
.class = ACPI_EC_CLASS,
.ids = ACPI_EC_HID,
.ops = {
};
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
-struct acpi_ec {
+/* External interfaces use first EC only, so remember */
+static struct acpi_ec {
acpi_handle handle;
- unsigned long uid;
- unsigned long gpe_bit;
+ unsigned long gpe;
unsigned long command_addr;
unsigned long data_addr;
unsigned long global_lock;
- struct semaphore sem;
- unsigned int expect_event;
- atomic_t leaving_burst; /* 0 : No, 1 : Yes, 2: abort */
+ struct mutex lock;
+ atomic_t query_pending;
+ atomic_t event_count;
wait_queue_head_t wait;
-} *ec_ecdt;
-
-/* External interfaces use first EC only, so remember */
-static struct acpi_device *first_ec;
-static int acpi_ec_mode = EC_INTR;
+} *boot_ec, *first_ec;
/* --------------------------------------------------------------------------
Transaction Management
outb(data, ec->data_addr);
}
-static int acpi_ec_check_status(struct acpi_ec *ec, u8 event)
+static inline int acpi_ec_check_status(struct acpi_ec *ec, enum ec_event event,
+ unsigned old_count)
{
u8 status = acpi_ec_read_status(ec);
- switch (event) {
- case ACPI_EC_EVENT_OBF_1:
+ if (old_count == atomic_read(&ec->event_count))
+ return 0;
+ if (event == ACPI_EC_EVENT_OBF_1) {
if (status & ACPI_EC_FLAG_OBF)
return 1;
- break;
- case ACPI_EC_EVENT_IBF_0:
+ } else if (event == ACPI_EC_EVENT_IBF_0) {
if (!(status & ACPI_EC_FLAG_IBF))
return 1;
- break;
- default:
- break;
}
return 0;
}
-static int acpi_ec_wait(struct acpi_ec *ec, u8 event)
+static int acpi_ec_wait(struct acpi_ec *ec, enum ec_event event, unsigned count)
{
- int i = (acpi_ec_mode == EC_POLL) ? ACPI_EC_UDELAY_COUNT : 0;
- long time_left;
-
- ec->expect_event = event;
- if (acpi_ec_check_status(ec, event)) {
- ec->expect_event = 0;
- return 0;
- }
-
- do {
- if (acpi_ec_mode == EC_POLL) {
- udelay(ACPI_EC_UDELAY);
- } else {
- time_left = wait_event_timeout(ec->wait,
- !ec->expect_event,
- msecs_to_jiffies(ACPI_EC_DELAY));
- if (time_left > 0) {
- ec->expect_event = 0;
+ 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;
- }
}
- if (acpi_ec_check_status(ec, event)) {
- ec->expect_event = 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)) {
return 0;
- }
- } while (--i > 0);
-
- ec->expect_event = 0;
-
- return -ETIME;
-}
-
-#ifdef ACPI_FUTURE_USAGE
-/*
- * Note: samsung nv5000 doesn't work with ec burst mode.
- * http://bugzilla.kernel.org/show_bug.cgi?id=4980
- */
-int acpi_ec_enter_burst_mode(struct acpi_ec *ec)
-{
- u8 tmp = 0;
- u8 status = 0;
-
-
- status = acpi_ec_read_status(ec);
- if (status != -EINVAL && !(status & ACPI_EC_FLAG_BURST)) {
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
- if (status)
- goto end;
- acpi_ec_write_cmd(ec, ACPI_EC_BURST_ENABLE);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
- tmp = acpi_ec_read_data(ec);
- if (tmp != 0x90) { /* Burst ACK byte */
- return -EINVAL;
+ } else {
+ printk(KERN_ERR PREFIX "acpi_ec_wait timeout,"
+ " status = %d, expect_event = %d\n",
+ acpi_ec_read_status(ec), event);
}
}
- atomic_set(&ec->leaving_burst, 0);
- return 0;
- end:
- ACPI_EXCEPTION((AE_INFO, status, "EC wait, burst mode"));
- return -1;
-}
-
-int acpi_ec_leave_burst_mode(struct acpi_ec *ec)
-{
- u8 status = 0;
-
-
- status = acpi_ec_read_status(ec);
- if (status != -EINVAL && (status & ACPI_EC_FLAG_BURST)){
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
- if(status)
- goto end;
- acpi_ec_write_cmd(ec, ACPI_EC_BURST_DISABLE);
- acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
- }
- atomic_set(&ec->leaving_burst, 1);
- return 0;
- end:
- ACPI_EXCEPTION((AE_INFO, status, "EC leave burst mode"));
- return -1;
+ return -ETIME;
}
-#endif /* ACPI_FUTURE_USAGE */
static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, u8 command,
- const u8 *wdata, unsigned wdata_len,
- u8 *rdata, unsigned rdata_len)
+ const u8 * wdata, unsigned wdata_len,
+ u8 * rdata, unsigned rdata_len)
{
- int result;
-
+ 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);
- if (result)
- return result;
+ 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++));
}
if (!rdata_len) {
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
- if (result)
- return result;
+ 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);
}
- for (; rdata_len > 0; rdata_len --) {
- result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF_1);
- if (result)
- return result;
-
+ 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);
}
-
- return 0;
+ end:
+ return result;
}
static int acpi_ec_transaction(struct acpi_ec *ec, u8 command,
- const u8 *wdata, unsigned wdata_len,
- u8 *rdata, unsigned rdata_len)
+ const u8 * wdata, unsigned wdata_len,
+ u8 * rdata, unsigned rdata_len)
{
int status;
u32 glk;
if (!ec || (wdata_len && !wdata) || (rdata_len && !rdata))
return -EINVAL;
- if (rdata)
- memset(rdata, 0, rdata_len);
+ if (rdata)
+ memset(rdata, 0, rdata_len);
+ mutex_lock(&ec->lock);
if (ec->global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
- if (ACPI_FAILURE(status))
+ if (ACPI_FAILURE(status)) {
+ mutex_unlock(&ec->lock);
return -ENODEV;
+ }
}
- down(&ec->sem);
/* Make sure GPE is enabled before doing transaction */
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
+ acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR);
- status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0);
+ status = acpi_ec_wait(ec, ACPI_EC_EVENT_IBF_0, 0);
if (status) {
- printk(KERN_DEBUG PREFIX "read EC, IB not empty\n");
+ printk(KERN_DEBUG PREFIX
+ "input buffer is not empty, aborting transaction\n");
goto end;
}
- status = acpi_ec_transaction_unlocked(ec, command,
- wdata, wdata_len,
- rdata, rdata_len);
+ status = acpi_ec_transaction_unlocked(ec, command,
+ wdata, wdata_len,
+ rdata, rdata_len);
-end:
- up(&ec->sem);
+ end:
if (ec->global_lock)
acpi_release_global_lock(glk);
+ mutex_unlock(&ec->lock);
return status;
}
-static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data)
+/*
+ * 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;
+ return acpi_ec_transaction(ec, ACPI_EC_BURST_ENABLE, NULL, 0, &d, 1);
+}
+
+int acpi_ec_burst_disable(struct acpi_ec *ec)
+{
+ return acpi_ec_transaction(ec, ACPI_EC_BURST_DISABLE, NULL, 0, NULL, 0);
+}
+
+static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data)
{
int result;
u8 d;
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,
+ u8 wdata[2] = { address, data };
+ return acpi_ec_transaction(ec, ACPI_EC_COMMAND_WRITE,
wdata, 2, NULL, 0);
}
/*
* Externally callable EC access functions. For now, assume 1 EC only
*/
-int ec_read(u8 addr, u8 *val)
+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)
{
- 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;
}
EXPORT_SYMBOL(ec_write);
-extern int ec_transaction(u8 command,
- const u8 *wdata, unsigned wdata_len,
- u8 *rdata, unsigned rdata_len)
+int ec_transaction(u8 command,
+ const u8 * wdata, unsigned wdata_len,
+ u8 * rdata, unsigned rdata_len)
{
- struct acpi_ec *ec;
-
if (!first_ec)
return -ENODEV;
- ec = acpi_driver_data(first_ec);
-
- return acpi_ec_transaction(ec, command, wdata,
+ return acpi_ec_transaction(first_ec, command, wdata,
wdata_len, rdata, rdata_len);
}
EXPORT_SYMBOL(ec_transaction);
-static int acpi_ec_query(struct acpi_ec *ec, u8 *data)
+static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
{
int result;
- u8 d;
+ u8 d;
- if (!ec || !data)
- return -EINVAL;
+ 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).
- */
+ /*
+ * 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, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
- if (result)
- return result;
+ result = acpi_ec_transaction(ec, ACPI_EC_COMMAND_QUERY, NULL, 0, &d, 1);
+ if (result)
+ return result;
- if (!d)
- return -ENODATA;
+ if (!d)
+ return -ENODATA;
- *data = d;
- return 0;
+ *data = d;
+ return 0;
}
/* --------------------------------------------------------------------------
Event Management
-------------------------------------------------------------------------- */
-struct acpi_ec_query_data {
- acpi_handle handle;
- u8 data;
-};
-
static void acpi_ec_gpe_query(void *ec_cxt)
{
- struct acpi_ec *ec = (struct acpi_ec *)ec_cxt;
+ struct acpi_ec *ec = ec_cxt;
u8 value = 0;
- static char object_name[8];
-
- if (!ec)
- goto end;
+ char object_name[8];
- value = acpi_ec_read_status(ec);
-
- if (!(value & ACPI_EC_FLAG_SCI))
- goto end;
-
- if (acpi_ec_query(ec, &value))
- goto end;
+ 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);
-
- end:
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
}
static u32 acpi_ec_gpe_handler(void *data)
{
acpi_status status = AE_OK;
u8 value;
- struct acpi_ec *ec = (struct acpi_ec *)data;
-
- acpi_clear_gpe(NULL, ec->gpe_bit, ACPI_ISR);
+ struct acpi_ec *ec = data;
+ atomic_inc(&ec->event_count);
if (acpi_ec_mode == EC_INTR) {
- if (acpi_ec_check_status(ec, ec->expect_event)) {
- ec->expect_event = 0;
- wake_up(&ec->wait);
- }
+ wake_up(&ec->wait);
}
value = acpi_ec_read_status(ec);
- if (value & ACPI_EC_FLAG_SCI) {
- status = acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec);
- return status == AE_OK ?
- ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
+ 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);
}
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
+
return status == AE_OK ?
ACPI_INTERRUPT_HANDLED : ACPI_INTERRUPT_NOT_HANDLED;
}
void *handler_context, void *region_context)
{
int result = 0;
- struct acpi_ec *ec = NULL;
+ struct acpi_ec *ec = handler_context;
u64 temp = *value;
acpi_integer f_v = 0;
int i = 0;
-
if ((address > 0xFF) || !value || !handler_context)
return AE_BAD_PARAMETER;
return AE_BAD_PARAMETER;
}
- ec = (struct acpi_ec *)handler_context;
-
next_byte:
switch (function) {
case ACPI_READ:
temp = 0;
- result = acpi_ec_read(ec, (u8) address, (u8 *) &temp);
+ result = acpi_ec_read(ec, (u8) address, (u8 *) & temp);
break;
case ACPI_WRITE:
result = acpi_ec_write(ec, (u8) address, (u8) temp);
static int acpi_ec_read_info(struct seq_file *seq, void *offset)
{
- struct acpi_ec *ec = (struct acpi_ec *)seq->private;
-
+ struct acpi_ec *ec = seq->private;
if (!ec)
goto end;
- seq_printf(seq, "gpe bit: 0x%02x\n",
- (u32) ec->gpe_bit);
- 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_bit, ACPI_NOT_ISR);
-
end:
return 0;
}
{
struct proc_dir_entry *entry = NULL;
-
if (!acpi_device_dir(device)) {
acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
acpi_ec_dir);
/* --------------------------------------------------------------------------
Driver Interface
-------------------------------------------------------------------------- */
+static acpi_status
+ec_parse_io_ports(struct acpi_resource *resource, void *context);
+
+static acpi_status
+ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval);
+
+static struct acpi_ec *make_acpi_ec(void)
+{
+ struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+ if (!ec)
+ return NULL;
+
+ atomic_set(&ec->query_pending, 1);
+ atomic_set(&ec->event_count, 1);
+ mutex_init(&ec->lock);
+ init_waitqueue_head(&ec->wait);
+
+ return ec;
+}
static int acpi_ec_add(struct acpi_device *device)
{
- int result = 0;
acpi_status status = AE_OK;
struct acpi_ec *ec = NULL;
-
if (!device)
return -EINVAL;
- ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
- if (!ec)
- return -ENOMEM;
- memset(ec, 0, sizeof(struct acpi_ec));
-
- ec->handle = device->handle;
- ec->uid = -1;
- init_MUTEX(&ec->sem);
- if (acpi_ec_mode == EC_INTR) {
- atomic_set(&ec->leaving_burst, 1);
- init_waitqueue_head(&ec->wait);
- }
strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
strcpy(acpi_device_class(device), ACPI_EC_CLASS);
- acpi_driver_data(device) = ec;
-
- /* Use the global lock for all EC transactions? */
- acpi_evaluate_integer(ec->handle, "_GLK", NULL,
- &ec->global_lock);
-
- /* 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);
- acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit,
- &acpi_ec_gpe_handler);
+ ec = make_acpi_ec();
+ if (!ec)
+ return -ENOMEM;
- kfree(ec_ecdt);
+ status = ec_parse_device(device->handle, 0, ec, NULL);
+ if (status != AE_CTRL_TERMINATE) {
+ kfree(ec);
+ return -EINVAL;
}
- /* Get GPE bit assignment (EC events). */
- /* TODO: Add support for _GPE returning a package */
- status =
- acpi_evaluate_integer(ec->handle, "_GPE", NULL,
- &ec->gpe_bit);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status, "Obtaining GPE bit assignment"));
- result = -ENODEV;
- goto end;
- }
+ /* Check if we found the boot EC */
+ if (boot_ec) {
+ if (boot_ec->gpe == ec->gpe) {
+ /* We might have incorrect info for GL at boot time */
+ mutex_lock(&boot_ec->lock);
+ boot_ec->global_lock = ec->global_lock;
+ mutex_unlock(&boot_ec->lock);
+ kfree(ec);
+ ec = boot_ec;
+ }
+ } else
+ first_ec = ec;
+ ec->handle = device->handle;
+ acpi_driver_data(device) = ec;
- result = acpi_ec_add_fs(device);
- if (result)
- goto end;
+ acpi_ec_add_fs(device);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s [%s] (gpe %d) interrupt mode.",
- acpi_device_name(device), acpi_device_bid(device),
- (u32) ec->gpe_bit));
-
- if (!first_ec)
- first_ec = device;
+ acpi_device_name(device), acpi_device_bid(device),
+ (u32) ec->gpe));
- end:
- if (result)
- kfree(ec);
-
- return result;
+ return 0;
}
static int acpi_ec_remove(struct acpi_device *device, int type)
{
- struct acpi_ec *ec = NULL;
-
+ struct acpi_ec *ec;
if (!device)
return -EINVAL;
ec = acpi_driver_data(device);
-
acpi_ec_remove_fs(device);
+ acpi_driver_data(device) = NULL;
+ if (ec == first_ec)
+ first_ec = NULL;
- kfree(ec);
-
+ /* Don't touch boot EC */
+ if (boot_ec != ec)
+ 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 = (struct acpi_ec *)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 acpi_ec_start(struct acpi_device *device)
+static int ec_install_handlers(struct acpi_ec *ec)
{
- acpi_status status = AE_OK;
- struct acpi_ec *ec = NULL;
+ acpi_status status;
+ 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);
+ status = acpi_install_address_space_handler(ec->handle,
+ ACPI_ADR_SPACE_EC,
+ &acpi_ec_space_handler,
+ &acpi_ec_space_setup, ec);
+ if (ACPI_FAILURE(status)) {
+ acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
+ return -ENODEV;
+ }
+
+ /* EC is fully operational, allow queries */
+ atomic_set(&ec->query_pending, 0);
+
+ return 0;
+}
+
+static int acpi_ec_start(struct acpi_device *device)
+{
+ struct acpi_ec *ec;
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_bit, ec->command_addr, ec->data_addr));
+ ec->gpe, ec->command_addr, ec->data_addr));
- /*
- * Install GPE handler
- */
- status = acpi_install_gpe_handler(NULL, ec->gpe_bit,
- ACPI_GPE_EDGE_TRIGGERED,
- &acpi_ec_gpe_handler, ec);
- if (ACPI_FAILURE(status)) {
- return -ENODEV;
- }
- acpi_set_gpe_type(NULL, ec->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
- acpi_enable_gpe(NULL, ec->gpe_bit, ACPI_NOT_ISR);
-
- status = acpi_install_address_space_handler(ec->handle,
- ACPI_ADR_SPACE_EC,
- &acpi_ec_space_handler,
- &acpi_ec_space_setup, ec);
- if (ACPI_FAILURE(status)) {
- acpi_remove_gpe_handler(NULL, ec->gpe_bit,
- &acpi_ec_gpe_handler);
- return -ENODEV;
- }
+ /* Boot EC is already working */
+ if (ec == boot_ec)
+ return 0;
- return AE_OK;
+ return ec_install_handlers(ec);
}
static int acpi_ec_stop(struct acpi_device *device, int type)
{
- acpi_status status = AE_OK;
- struct acpi_ec *ec = NULL;
-
+ acpi_status status;
+ struct acpi_ec *ec;
if (!device)
return -EINVAL;
ec = acpi_driver_data(device);
+ if (!ec)
+ return -EINVAL;
+
+ /* Don't touch boot EC */
+ if (ec == boot_ec)
+ return 0;
status = acpi_remove_address_space_handler(ec->handle,
ACPI_ADR_SPACE_EC,
if (ACPI_FAILURE(status))
return -ENODEV;
- status =
- acpi_remove_gpe_handler(NULL, ec->gpe_bit,
- &acpi_ec_gpe_handler);
+ status = acpi_remove_gpe_handler(NULL, ec->gpe, &acpi_ec_gpe_handler);
if (ACPI_FAILURE(status))
return -ENODEV;
return 0;
}
-static acpi_status __init
-acpi_fake_ecdt_callback(acpi_handle handle,
- u32 Level, void *context, void **retval)
+static acpi_status
+ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
{
acpi_status status;
- init_MUTEX(&ec_ecdt->sem);
- if (acpi_ec_mode == EC_INTR) {
- init_waitqueue_head(&ec_ecdt->wait);
- }
+ struct acpi_ec *ec = context;
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
- acpi_ec_io_ports, ec_ecdt);
+ ec_parse_io_ports, ec);
if (ACPI_FAILURE(status))
return status;
- ec_ecdt->uid = -1;
- acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
-
- status =
- acpi_evaluate_integer(handle, "_GPE", NULL,
- &ec_ecdt->gpe_bit);
+ /* Get GPE bit assignment (EC events). */
+ /* TODO: Add support for _GPE returning a package */
+ status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
if (ACPI_FAILURE(status))
return status;
- ec_ecdt->global_lock = TRUE;
- ec_ecdt->handle = handle;
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
- ec_ecdt->gpe_bit, ec_ecdt->command_addr, ec_ecdt->data_addr));
- return AE_CTRL_TERMINATE;
-}
-
-/*
- * Some BIOS (such as some from Gateway laptops) access EC region very early
- * such as in BAT0._INI or EC._INI before an EC device is found and
- * do not provide an ECDT. According to ACPI spec, ECDT isn't mandatorily
- * required, but if EC regison is accessed early, it is required.
- * The routine tries to workaround the BIOS bug by pre-scan EC device
- * It assumes that _CRS, _HID, _GPE, _UID methods of EC don't touch any
- * op region (since _REG isn't invoked yet). The assumption is true for
- * all systems found.
- */
-static int __init acpi_ec_fake_ecdt(void)
-{
- acpi_status status;
- int ret = 0;
+ /* Use the global lock for all EC transactions? */
+ acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Try to make an fake ECDT"));
+ ec->handle = handle;
- ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
- if (!ec_ecdt) {
- ret = -ENOMEM;
- goto error;
- }
- memset(ec_ecdt, 0, sizeof(struct acpi_ec));
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
+ ec->gpe, ec->command_addr, ec->data_addr));
- status = acpi_get_devices(ACPI_EC_HID,
- acpi_fake_ecdt_callback, NULL, NULL);
- if (ACPI_FAILURE(status)) {
- kfree(ec_ecdt);
- ec_ecdt = NULL;
- ret = -ENODEV;
- ACPI_EXCEPTION((AE_INFO, status, "Can't make an fake ECDT"));
- goto error;
- }
- return 0;
- error:
- return ret;
+ return AE_CTRL_TERMINATE;
}
-static int __init acpi_ec_get_real_ecdt(void)
+int __init acpi_ec_ecdt_probe(void)
{
+ int ret;
acpi_status status;
struct acpi_table_ecdt *ecdt_ptr;
- status = acpi_get_firmware_table("ECDT", 1, ACPI_LOGICAL_ADDRESSING,
- (struct acpi_table_header **)
- &ecdt_ptr);
- if (ACPI_FAILURE(status))
- return -ENODEV;
-
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
-
+ 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 = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
- if (!ec_ecdt)
- return -ENOMEM;
- memset(ec_ecdt, 0, sizeof(struct acpi_ec));
- init_MUTEX(&ec_ecdt->sem);
- if (acpi_ec_mode == EC_INTR) {
- init_waitqueue_head(&ec_ecdt->wait);
- }
- ec_ecdt->command_addr = ecdt_ptr->ec_control.address;
- ec_ecdt->data_addr = ecdt_ptr->ec_data.address;
- ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
- /* use the GL just to be safe */
- ec_ecdt->global_lock = TRUE;
- ec_ecdt->uid = ecdt_ptr->uid;
-
- status =
- acpi_get_handle(NULL, ecdt_ptr->ec_id, &ec_ecdt->handle);
- if (ACPI_FAILURE(status)) {
+ status = acpi_get_table(ACPI_SIG_ECDT, 1,
+ (struct acpi_table_header **)&ecdt_ptr);
+ if (ACPI_FAILURE(status))
goto error;
- }
-
- return 0;
- error:
- ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
- kfree(ec_ecdt);
- ec_ecdt = NULL;
- return -ENODEV;
-}
-
-static int __initdata acpi_fake_ecdt_enabled;
-int __init acpi_ec_ecdt_probe(void)
-{
- acpi_status status;
- int ret;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
- ret = acpi_ec_get_real_ecdt();
- /* Try to make a fake ECDT */
- if (ret && acpi_fake_ecdt_enabled) {
- ret = acpi_ec_fake_ecdt();
- }
+ 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;
- if (ret)
+ ret = ec_install_handlers(boot_ec);
+ if (!ret) {
+ first_ec = boot_ec;
return 0;
-
- /*
- * Install GPE handler
- */
- status = acpi_install_gpe_handler(NULL, ec_ecdt->gpe_bit,
- ACPI_GPE_EDGE_TRIGGERED,
- &acpi_ec_gpe_handler, ec_ecdt);
- if (ACPI_FAILURE(status)) {
- goto error;
}
- acpi_set_gpe_type(NULL, ec_ecdt->gpe_bit, ACPI_GPE_TYPE_RUNTIME);
- acpi_enable_gpe(NULL, ec_ecdt->gpe_bit, ACPI_NOT_ISR);
-
- status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
- ACPI_ADR_SPACE_EC,
- &acpi_ec_space_handler,
- &acpi_ec_space_setup,
- ec_ecdt);
- if (ACPI_FAILURE(status)) {
- acpi_remove_gpe_handler(NULL, ec_ecdt->gpe_bit,
- &acpi_ec_gpe_handler);
- goto error;
- }
-
- return 0;
-
error:
- ACPI_EXCEPTION((AE_INFO, status, "Could not use ECDT"));
- kfree(ec_ecdt);
- ec_ecdt = NULL;
+ kfree(boot_ec);
+ boot_ec = NULL;
return -ENODEV;
}
{
int result = 0;
-
if (acpi_disabled)
return 0;
}
#endif /* 0 */
-static int __init acpi_fake_ecdt_setup(char *str)
-{
- acpi_fake_ecdt_enabled = 1;
- return 1;
-}
-
-__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);
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;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "EC %s mode.\n", intr ? "interrupt" : "polling"));
+ acpi_ec_mode = (intr) ? EC_INTR : EC_POLL;
+
+ printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling");
return 1;
}