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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/ec.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/acpi/ec.c')
-rw-r--r--drivers/acpi/ec.c1024
1 files changed, 1024 insertions, 0 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
new file mode 100644
index 000000000000..fdf143b405be
--- /dev/null
+++ b/drivers/acpi/ec.c
@@ -0,0 +1,1024 @@
+/*
+ * acpi_ec.c - ACPI Embedded Controller Driver ($Revision: 38 $)
+ *
+ * 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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#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 <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 ("acpi_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"
+
+
+#define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */
+#define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */
+#define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */
+
+#define ACPI_EC_EVENT_OBF 0x01 /* Output buffer full */
+#define ACPI_EC_EVENT_IBE 0x02 /* Input buffer empty */
+
+#define ACPI_EC_UDELAY 100 /* Poll @ 100us increments */
+#define ACPI_EC_UDELAY_COUNT 1000 /* Wait 10ms max. during EC ops */
+#define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */
+
+#define ACPI_EC_COMMAND_READ 0x80
+#define ACPI_EC_COMMAND_WRITE 0x81
+#define ACPI_EC_COMMAND_QUERY 0x84
+
+static int acpi_ec_add (struct acpi_device *device);
+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 struct acpi_driver acpi_ec_driver = {
+ .name = ACPI_EC_DRIVER_NAME,
+ .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 acpi_ec {
+ acpi_handle handle;
+ unsigned long uid;
+ unsigned long gpe_bit;
+ struct acpi_generic_address status_addr;
+ struct acpi_generic_address command_addr;
+ struct acpi_generic_address data_addr;
+ unsigned long global_lock;
+ spinlock_t lock;
+};
+
+/* If we find an EC via the ECDT, we need to keep a ptr to its context */
+static struct acpi_ec *ec_ecdt;
+
+/* External interfaces use first EC only, so remember */
+static struct acpi_device *first_ec;
+
+/* --------------------------------------------------------------------------
+ Transaction Management
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_ec_wait (
+ struct acpi_ec *ec,
+ u8 event)
+{
+ u32 acpi_ec_status = 0;
+ u32 i = ACPI_EC_UDELAY_COUNT;
+
+ if (!ec)
+ return -EINVAL;
+
+ /* Poll the EC status register waiting for the event to occur. */
+ switch (event) {
+ case ACPI_EC_EVENT_OBF:
+ do {
+ acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
+ if (acpi_ec_status & ACPI_EC_FLAG_OBF)
+ return 0;
+ udelay(ACPI_EC_UDELAY);
+ } while (--i>0);
+ break;
+ case ACPI_EC_EVENT_IBE:
+ do {
+ acpi_hw_low_level_read(8, &acpi_ec_status, &ec->status_addr);
+ if (!(acpi_ec_status & ACPI_EC_FLAG_IBF))
+ return 0;
+ udelay(ACPI_EC_UDELAY);
+ } while (--i>0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return -ETIME;
+}
+
+
+static int
+acpi_ec_read (
+ struct acpi_ec *ec,
+ u8 address,
+ u32 *data)
+{
+ acpi_status status = AE_OK;
+ int result = 0;
+ unsigned long flags = 0;
+ u32 glk = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_read");
+
+ if (!ec || !data)
+ return_VALUE(-EINVAL);
+
+ *data = 0;
+
+ if (ec->global_lock) {
+ status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
+ if (ACPI_FAILURE(status))
+ return_VALUE(-ENODEV);
+ }
+
+ spin_lock_irqsave(&ec->lock, flags);
+
+ acpi_hw_low_level_write(8, ACPI_EC_COMMAND_READ, &ec->command_addr);
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+ if (result)
+ goto end;
+
+ acpi_hw_low_level_write(8, address, &ec->data_addr);
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
+ if (result)
+ goto end;
+
+
+ acpi_hw_low_level_read(8, data, &ec->data_addr);
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Read [%02x] from address [%02x]\n",
+ *data, address));
+
+end:
+ spin_unlock_irqrestore(&ec->lock, flags);
+
+ if (ec->global_lock)
+ acpi_release_global_lock(glk);
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_ec_write (
+ struct acpi_ec *ec,
+ u8 address,
+ u8 data)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ unsigned long flags = 0;
+ u32 glk = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_write");
+
+ if (!ec)
+ return_VALUE(-EINVAL);
+
+ if (ec->global_lock) {
+ status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
+ if (ACPI_FAILURE(status))
+ return_VALUE(-ENODEV);
+ }
+
+ spin_lock_irqsave(&ec->lock, flags);
+
+ acpi_hw_low_level_write(8, ACPI_EC_COMMAND_WRITE, &ec->command_addr);
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+ if (result)
+ goto end;
+
+ acpi_hw_low_level_write(8, address, &ec->data_addr);
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+ if (result)
+ goto end;
+
+ acpi_hw_low_level_write(8, data, &ec->data_addr);
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_IBE);
+ if (result)
+ goto end;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Wrote [%02x] to address [%02x]\n",
+ data, address));
+
+end:
+ spin_unlock_irqrestore(&ec->lock, flags);
+
+ if (ec->global_lock)
+ acpi_release_global_lock(glk);
+
+ return_VALUE(result);
+}
+
+/*
+ * Externally callable EC access functions. For now, assume 1 EC only
+ */
+int
+ec_read(u8 addr, u8 *val)
+{
+ struct acpi_ec *ec;
+ int err;
+ u32 temp_data;
+
+ if (!first_ec)
+ return -ENODEV;
+
+ ec = acpi_driver_data(first_ec);
+
+ err = acpi_ec_read(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)
+{
+ struct acpi_ec *ec;
+ int err;
+
+ if (!first_ec)
+ return -ENODEV;
+
+ ec = acpi_driver_data(first_ec);
+
+ err = acpi_ec_write(ec, addr, val);
+
+ return err;
+}
+EXPORT_SYMBOL(ec_write);
+
+
+static int
+acpi_ec_query (
+ struct acpi_ec *ec,
+ u32 *data)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ unsigned long flags = 0;
+ u32 glk = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_query");
+
+ if (!ec || !data)
+ return_VALUE(-EINVAL);
+
+ *data = 0;
+
+ if (ec->global_lock) {
+ status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
+ if (ACPI_FAILURE(status))
+ return_VALUE(-ENODEV);
+ }
+
+ /*
+ * 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).
+ */
+ spin_lock_irqsave(&ec->lock, flags);
+
+ acpi_hw_low_level_write(8, ACPI_EC_COMMAND_QUERY, &ec->command_addr);
+ result = acpi_ec_wait(ec, ACPI_EC_EVENT_OBF);
+ if (result)
+ goto end;
+
+ acpi_hw_low_level_read(8, data, &ec->data_addr);
+ if (!*data)
+ result = -ENODATA;
+
+end:
+ spin_unlock_irqrestore(&ec->lock, flags);
+
+ if (ec->global_lock)
+ acpi_release_global_lock(glk);
+
+ return_VALUE(result);
+}
+
+
+/* --------------------------------------------------------------------------
+ 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;
+ u32 value = 0;
+ unsigned long flags = 0;
+ static char object_name[5] = {'_','Q','0','0','\0'};
+ const char hex[] = {'0','1','2','3','4','5','6','7',
+ '8','9','A','B','C','D','E','F'};
+
+ ACPI_FUNCTION_TRACE("acpi_ec_gpe_query");
+
+ if (!ec_cxt)
+ goto end;
+
+ spin_lock_irqsave(&ec->lock, flags);
+ acpi_hw_low_level_read(8, &value, &ec->command_addr);
+ spin_unlock_irqrestore(&ec->lock, flags);
+
+ /* TBD: Implement asynch events!
+ * NOTE: All we care about are EC-SCI's. Other EC events are
+ * handled via polling (yuck!). This is because some systems
+ * treat EC-SCIs as level (versus EDGE!) triggered, preventing
+ * a purely interrupt-driven approach (grumble, grumble).
+ */
+ if (!(value & ACPI_EC_FLAG_SCI))
+ goto end;
+
+ if (acpi_ec_query(ec, &value))
+ goto end;
+
+ object_name[2] = hex[((value >> 4) & 0x0F)];
+ object_name[3] = hex[(value & 0x0F)];
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s\n", 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;
+ struct acpi_ec *ec = (struct acpi_ec *) data;
+
+ if (!ec)
+ return ACPI_INTERRUPT_NOT_HANDLED;
+
+ acpi_disable_gpe(NULL, ec->gpe_bit, ACPI_ISR);
+
+ status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
+ acpi_ec_gpe_query, ec);
+
+ if (status == AE_OK)
+ return ACPI_INTERRUPT_HANDLED;
+ else
+ return ACPI_INTERRUPT_NOT_HANDLED;
+}
+
+/* --------------------------------------------------------------------------
+ Address Space Management
+ -------------------------------------------------------------------------- */
+
+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.
+ */
+ if(function == ACPI_REGION_DEACTIVATE)
+ *return_context = NULL;
+ else
+ *return_context = handler_context;
+
+ return AE_OK;
+}
+
+
+static acpi_status
+acpi_ec_space_handler (
+ u32 function,
+ acpi_physical_address address,
+ u32 bit_width,
+ acpi_integer *value,
+ void *handler_context,
+ void *region_context)
+{
+ int result = 0;
+ struct acpi_ec *ec = NULL;
+ u32 temp = 0;
+ acpi_integer f_v = 0;
+ int i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_space_handler");
+
+ if ((address > 0xFF) || !value || !handler_context)
+ return_VALUE(AE_BAD_PARAMETER);
+
+ if(bit_width != 8) {
+ printk(KERN_WARNING PREFIX "acpi_ec_space_handler: bit_width should be 8\n");
+ if (acpi_strict)
+ return_VALUE(AE_BAD_PARAMETER);
+ }
+
+ ec = (struct acpi_ec *) handler_context;
+
+next_byte:
+ switch (function) {
+ case ACPI_READ:
+ result = acpi_ec_read(ec, (u8) address, &temp);
+ *value = (acpi_integer) temp;
+ break;
+ case ACPI_WRITE:
+ result = acpi_ec_write(ec, (u8) address, (u8) *value);
+ break;
+ default:
+ result = -EINVAL;
+ goto out;
+ break;
+ }
+
+ bit_width -= 8;
+ if(bit_width){
+
+ if(function == ACPI_READ)
+ f_v |= (acpi_integer) (*value) << 8*i;
+ if(function == ACPI_WRITE)
+ (*value) >>=8;
+ i++;
+ goto next_byte;
+ }
+
+
+ if(function == ACPI_READ){
+ f_v |= (acpi_integer) (*value) << 8*i;
+ *value = f_v;
+ }
+
+
+out:
+ switch (result) {
+ case -EINVAL:
+ return_VALUE(AE_BAD_PARAMETER);
+ break;
+ case -ENODEV:
+ return_VALUE(AE_NOT_FOUND);
+ break;
+ case -ETIME:
+ return_VALUE(AE_TIME);
+ break;
+ default:
+ return_VALUE(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 = (struct acpi_ec *) seq->private;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_read_info");
+
+ 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->status_addr.address, (u32) ec->data_addr.address);
+ seq_printf(seq, "use global lock: %s\n",
+ ec->global_lock?"yes":"no");
+
+end:
+ return_VALUE(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;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_add_fs");
+
+ if (!acpi_device_dir(device)) {
+ acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
+ acpi_ec_dir);
+ if (!acpi_device_dir(device))
+ return_VALUE(-ENODEV);
+ }
+
+ entry = create_proc_entry(ACPI_EC_FILE_INFO, S_IRUGO,
+ acpi_device_dir(device));
+ if (!entry)
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+ "Unable to create '%s' fs entry\n",
+ ACPI_EC_FILE_INFO));
+ else {
+ entry->proc_fops = &acpi_ec_info_ops;
+ entry->data = acpi_driver_data(device);
+ entry->owner = THIS_MODULE;
+ }
+
+ return_VALUE(0);
+}
+
+
+static int
+acpi_ec_remove_fs (
+ struct acpi_device *device)
+{
+ ACPI_FUNCTION_TRACE("acpi_ec_remove_fs");
+
+ 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_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+ Driver Interface
+ -------------------------------------------------------------------------- */
+
+static int
+acpi_ec_add (
+ struct acpi_device *device)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ struct acpi_ec *ec = NULL;
+ unsigned long uid;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_add");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ ec = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+ if (!ec)
+ return_VALUE(-ENOMEM);
+ memset(ec, 0, sizeof(struct acpi_ec));
+
+ ec->handle = device->handle;
+ ec->uid = -1;
+ spin_lock_init(&ec->lock);
+ 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);
+
+ /* If our UID matches the UID for the ECDT-enumerated EC,
+ we now have the *real* EC info, so kill the makeshift one.*/
+ acpi_evaluate_integer(ec->handle, "_UID", NULL, &uid);
+ if (ec_ecdt && ec_ecdt->uid == uid) {
+ 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);
+
+ kfree(ec_ecdt);
+ }
+
+ /* 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_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Error obtaining GPE bit assignment\n"));
+ result = -ENODEV;
+ goto end;
+ }
+
+ result = acpi_ec_add_fs(device);
+ if (result)
+ goto end;
+
+ printk(KERN_INFO PREFIX "%s [%s] (gpe %d)\n",
+ acpi_device_name(device), acpi_device_bid(device),
+ (u32) ec->gpe_bit);
+
+ if (!first_ec)
+ first_ec = device;
+
+end:
+ if (result)
+ kfree(ec);
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_ec_remove (
+ struct acpi_device *device,
+ int type)
+{
+ struct acpi_ec *ec = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_remove");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ ec = acpi_driver_data(device);
+
+ acpi_ec_remove_fs(device);
+
+ kfree(ec);
+
+ return_VALUE(0);
+}
+
+
+static acpi_status
+acpi_ec_io_ports (
+ struct acpi_resource *resource,
+ void *context)
+{
+ struct acpi_ec *ec = (struct acpi_ec *) context;
+ struct acpi_generic_address *addr;
+
+ if (resource->id != ACPI_RSTYPE_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.register_bit_width == 0) {
+ addr = &ec->data_addr;
+ } else if (ec->command_addr.register_bit_width == 0) {
+ addr = &ec->command_addr;
+ } else {
+ return AE_CTRL_TERMINATE;
+ }
+
+ addr->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
+ addr->register_bit_width = 8;
+ addr->register_bit_offset = 0;
+ addr->address = resource->data.io.min_base_address;
+
+ return AE_OK;
+}
+
+
+static int
+acpi_ec_start (
+ struct acpi_device *device)
+{
+ acpi_status status = AE_OK;
+ struct acpi_ec *ec = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_start");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ ec = acpi_driver_data(device);
+
+ if (!ec)
+ return_VALUE(-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.register_bit_width == 0) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error getting I/O port addresses"));
+ return_VALUE(-ENODEV);
+ }
+
+ ec->status_addr = ec->command_addr;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "gpe=0x%02x, ports=0x%2x,0x%2x\n",
+ (u32) ec->gpe_bit, (u32) ec->command_addr.address,
+ (u32) ec->data_addr.address));
+
+ /*
+ * 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_VALUE(-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_VALUE(-ENODEV);
+ }
+
+ return_VALUE(AE_OK);
+}
+
+
+static int
+acpi_ec_stop (
+ struct acpi_device *device,
+ int type)
+{
+ acpi_status status = AE_OK;
+ struct acpi_ec *ec = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_stop");
+
+ if (!device)
+ return_VALUE(-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_VALUE(-ENODEV);
+
+ status = acpi_remove_gpe_handler(NULL, ec->gpe_bit, &acpi_ec_gpe_handler);
+ if (ACPI_FAILURE(status))
+ return_VALUE(-ENODEV);
+
+ return_VALUE(0);
+}
+
+static acpi_status __init
+acpi_fake_ecdt_callback (
+ acpi_handle handle,
+ u32 Level,
+ void *context,
+ void **retval)
+{
+ acpi_status status;
+
+ status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+ acpi_ec_io_ports, ec_ecdt);
+ if (ACPI_FAILURE(status))
+ return status;
+ ec_ecdt->status_addr = ec_ecdt->command_addr;
+
+ ec_ecdt->uid = -1;
+ acpi_evaluate_integer(handle, "_UID", NULL, &ec_ecdt->uid);
+
+ status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec_ecdt->gpe_bit);
+ if (ACPI_FAILURE(status))
+ return status;
+ spin_lock_init(&ec_ecdt->lock);
+ ec_ecdt->global_lock = TRUE;
+ ec_ecdt->handle = handle;
+
+ printk(KERN_INFO PREFIX "GPE=0x%02x, ports=0x%2x, 0x%2x\n",
+ (u32) ec_ecdt->gpe_bit, (u32) ec_ecdt->command_addr.address,
+ (u32) ec_ecdt->data_addr.address);
+
+ 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;
+
+ printk(KERN_INFO PREFIX "Try to make an fake ECDT\n");
+
+ ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+ if (!ec_ecdt) {
+ ret = -ENOMEM;
+ goto error;
+ }
+ memset(ec_ecdt, 0, sizeof(struct acpi_ec));
+
+ 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;
+ goto error;
+ }
+ return 0;
+error:
+ printk(KERN_ERR PREFIX "Can't make an fake ECDT\n");
+ return ret;
+}
+
+static int __init
+acpi_ec_get_real_ecdt(void)
+{
+ 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;
+
+ printk(KERN_INFO PREFIX "Found ECDT\n");
+
+ /*
+ * Generate a temporary ec context to use until the namespace is scanned
+ */
+ ec_ecdt = kmalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+ if (!ec_ecdt)
+ return -ENOMEM;
+ memset(ec_ecdt, 0, sizeof(struct acpi_ec));
+
+ ec_ecdt->command_addr = ecdt_ptr->ec_control;
+ ec_ecdt->status_addr = ecdt_ptr->ec_control;
+ ec_ecdt->data_addr = ecdt_ptr->ec_data;
+ ec_ecdt->gpe_bit = ecdt_ptr->gpe_bit;
+ spin_lock_init(&ec_ecdt->lock);
+ /* 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)) {
+ goto error;
+ }
+
+ return 0;
+error:
+ printk(KERN_ERR PREFIX "Could not use ECDT\n");
+ 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;
+
+ ret = acpi_ec_get_real_ecdt();
+ /* Try to make a fake ECDT */
+ if (ret && acpi_fake_ecdt_enabled) {
+ ret = acpi_ec_fake_ecdt();
+ }
+
+ if (ret)
+ 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:
+ printk(KERN_ERR PREFIX "Could not use ECDT\n");
+ kfree(ec_ecdt);
+ ec_ecdt = NULL;
+
+ return -ENODEV;
+}
+
+
+static int __init acpi_ec_init (void)
+{
+ int result = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_ec_init");
+
+ if (acpi_disabled)
+ return_VALUE(0);
+
+ acpi_ec_dir = proc_mkdir(ACPI_EC_CLASS, acpi_root_dir);
+ if (!acpi_ec_dir)
+ return_VALUE(-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_VALUE(-ENODEV);
+ }
+
+ return_VALUE(result);
+}
+
+subsys_initcall(acpi_ec_init);
+
+/* EC driver currently not unloadable */
+#if 0
+static void __exit
+acpi_ec_exit (void)
+{
+ ACPI_FUNCTION_TRACE("acpi_ec_exit");
+
+ acpi_bus_unregister_driver(&acpi_ec_driver);
+
+ remove_proc_entry(ACPI_EC_CLASS, acpi_root_dir);
+
+ return_VOID;
+}
+#endif /* 0 */
+
+static int __init acpi_fake_ecdt_setup(char *str)
+{
+ acpi_fake_ecdt_enabled = 1;
+ return 0;
+}
+__setup("acpi_fake_ecdt", acpi_fake_ecdt_setup);