ACPI: EC: Clean ECDT and namespace parsing.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 399cedf2cfa625ce8afa00b82b5c5623581c1157..c9dcf9a2a4695b7494a27b712c63db4c515cfdb6 100644 (file)
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -604,74 +604,73 @@ static int acpi_ec_remove_fs(struct acpi_device *device)
 /* --------------------------------------------------------------------------
                                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, 0);
+       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 = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
+       strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME);
+       strcpy(acpi_device_class(device), ACPI_EC_CLASS);
+
+       ec = make_acpi_ec();
        if (!ec)
                return -ENOMEM;
 
-       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);
+       status = ec_parse_device(device->handle, 0, ec, NULL);
+       if (status != AE_CTRL_TERMINATE) {
+               kfree(ec);
+               return -EINVAL;
        }
-       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 */
+       /* Check if we found the boot EC */
        if (ec_ecdt) {
-               acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
-                                                 ACPI_ADR_SPACE_EC,
-                                                 &acpi_ec_space_handler);
+               if (ec_ecdt->gpe == ec->gpe) {
+                       /* We might have incorrect info for GL at boot time */
+                       mutex_lock(&ec_ecdt->lock);
+                       ec_ecdt->global_lock = ec->global_lock;
+                       mutex_unlock(&ec_ecdt->lock);
+                       kfree(ec);
+                       ec = ec_ecdt;
+               }
+       }
 
-               acpi_remove_gpe_handler(NULL, ec_ecdt->gpe,
-                                       &acpi_ec_gpe_handler);
+       ec->handle = device->handle;
 
-               kfree(ec_ecdt);
-       }
+       acpi_driver_data(device) = ec;
 
-       /* 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;
-       }
+       if (!first_ec)
+               first_ec = device;
 
-       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));
 
-       if (!first_ec)
-               first_ec = device;
-
-      end:
-       if (result)
-               kfree(ec);
-
-       return result;
+       return 0;
 }
 
 static int acpi_ec_remove(struct acpi_device *device, int type)
@@ -685,13 +684,19 @@ static int acpi_ec_remove(struct acpi_device *device, int type)
 
        acpi_ec_remove_fs(device);
 
-       kfree(ec);
+       acpi_driver_data(device) = NULL;
+       if (device == first_ec)
+               first_ec = NULL;
+
+       /* Don't touch boot EC */
+       if (ec_ecdt != 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 = context;
 
@@ -717,9 +722,10 @@ acpi_ec_io_ports(struct acpi_resource *resource, void *context)
 
 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;
+       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);
@@ -739,8 +745,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
 
 static int acpi_ec_start(struct acpi_device *device)
 {
-       acpi_status status = AE_OK;
-       struct acpi_ec *ec = NULL;
+       struct acpi_ec *ec;
 
        if (!device)
                return -EINVAL;
@@ -750,32 +755,31 @@ static int acpi_ec_start(struct acpi_device *device)
        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));
 
+       /* Boot EC is already working */
+       if (ec == ec_ecdt)
+               return 0;
+
        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 == ec_ecdt)
+               return 0;
 
        status = acpi_remove_address_space_handler(ec->handle,
                                                   ACPI_ADR_SPACE_EC,
@@ -790,51 +794,64 @@ static int acpi_ec_stop(struct acpi_device *device, int type)
        return 0;
 }
 
-static int __init acpi_ec_get_real_ecdt(void)
+static acpi_status
+ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
 {
        acpi_status status;
+
+       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, &ec->gpe);
+       if (ACPI_FAILURE(status))
+               return status;
+
+       /* Use the global lock for all EC transactions? */
+       acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
+
+       ec->handle = handle;
+
+       ACPI_DEBUG_PRINT((ACPI_DB_INFO, "GPE=0x%02lx, ports=0x%2lx, 0x%2lx",
+                         ec->gpe, ec->command_addr, ec->data_addr));
+
+       return AE_CTRL_TERMINATE;
+}
+
+int __init acpi_ec_ecdt_probe(void)
+{
+       int ret;
+       acpi_status status;
        struct acpi_table_ecdt *ecdt_ptr;
 
+       ec_ecdt = make_acpi_ec();
+       if (!ec_ecdt)
+               return -ENOMEM;
+       /*
+        * Generate a boot ec context
+        */
+
        status = acpi_get_table(ACPI_SIG_ECDT, 1,
                                (struct acpi_table_header **)&ecdt_ptr);
        if (ACPI_FAILURE(status))
-               return -ENODEV;
+               goto error;
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found ECDT"));
 
-       /*
-        * Generate a temporary ec context to use until the namespace is scanned
-        */
-       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);
-       }
        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;
-
        ec_ecdt->handle = ACPI_ROOT_OBJECT;
-       return 0;
-}
-
-int __init acpi_ec_ecdt_probe(void)
-{
-       int ret;
-
-       ret = acpi_ec_get_real_ecdt();
-       if (ret)
-               return 0;
 
        ret = ec_install_handlers(ec_ecdt);
        if (!ret)
                return 0;
-
+      error:
        kfree(ec_ecdt);
        ec_ecdt = NULL;
 
@@ -884,12 +901,8 @@ static int __init acpi_ec_set_intr_mode(char *str)
        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_ec_mode = (intr) ? EC_INTR : EC_POLL;
+
        printk(KERN_NOTICE PREFIX "%s mode.\n", intr ? "interrupt" : "polling");
 
        return 1;