diff options
| -rw-r--r-- | drivers/acpi/ec.c | 96 |
1 files changed, 63 insertions, 33 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 1925589ecf66..9eab651a4502 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -184,6 +184,7 @@ static void acpi_ec_event_processor(struct work_struct *work); struct acpi_ec *boot_ec, *first_ec; EXPORT_SYMBOL(first_ec); +static bool boot_ec_is_ecdt = false; static struct workqueue_struct *ec_query_wq; static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ @@ -1304,7 +1305,16 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, static acpi_status ec_parse_io_ports(struct acpi_resource *resource, void *context); -static struct acpi_ec *make_acpi_ec(void) +static void acpi_ec_free(struct acpi_ec *ec) +{ + if (first_ec == ec) + first_ec = NULL; + if (boot_ec == ec) + boot_ec = NULL; + kfree(ec); +} + +static struct acpi_ec *acpi_ec_alloc(void) { struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); @@ -1365,6 +1375,11 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) return AE_CTRL_TERMINATE; } +/* + * Note: This function returns an error code only when the address space + * handler is not installed, which means "not able to handle + * transactions". + */ static int ec_install_handlers(struct acpi_ec *ec) { acpi_status status; @@ -1440,21 +1455,49 @@ static void ec_remove_handlers(struct acpi_ec *ec) } } -static struct acpi_ec *acpi_ec_alloc(void) +static int acpi_ec_setup(struct acpi_ec *ec) { - struct acpi_ec *ec; + int ret; - /* Check for boot EC */ - if (boot_ec) { - ec = boot_ec; - boot_ec = NULL; - ec_remove_handlers(ec); - if (first_ec == ec) - first_ec = NULL; - } else { - ec = make_acpi_ec(); + ret = ec_install_handlers(ec); + if (ret) + return ret; + + /* First EC capable of handling transactions */ + if (!first_ec) { + first_ec = ec; + acpi_handle_info(first_ec->handle, "Used as first EC\n"); } - return ec; + + acpi_handle_info(ec->handle, + "GPE=0x%lx, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", + ec->gpe, ec->command_addr, ec->data_addr); + return ret; +} + +static int acpi_config_boot_ec(struct acpi_ec *ec, bool is_ecdt) +{ + int ret; + + if (boot_ec) + ec_remove_handlers(boot_ec); + + /* Unset old boot EC */ + if (boot_ec != ec) + acpi_ec_free(boot_ec); + + ret = acpi_ec_setup(ec); + if (ret) + return ret; + + /* Set new boot EC */ + if (!boot_ec) { + boot_ec = ec; + boot_ec_is_ecdt = is_ecdt; + acpi_handle_info(boot_ec->handle, "Used as boot %s EC\n", + is_ecdt ? "ECDT" : "DSDT"); + } + return ret; } static int acpi_ec_add(struct acpi_device *device) @@ -1470,7 +1513,7 @@ static int acpi_ec_add(struct acpi_device *device) return -ENOMEM; if (ec_parse_device(device->handle, 0, ec, NULL) != AE_CTRL_TERMINATE) { - kfree(ec); + acpi_ec_free(ec); return -EINVAL; } @@ -1478,8 +1521,6 @@ static int acpi_ec_add(struct acpi_device *device) acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, acpi_ec_register_query_methods, NULL, ec, NULL); - if (!first_ec) - first_ec = ec; device->driver_data = ec; ret = !!request_region(ec->data_addr, 1, "EC data"); @@ -1487,10 +1528,7 @@ static int acpi_ec_add(struct acpi_device *device) ret = !!request_region(ec->command_addr, 1, "EC cmd"); WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); - pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", - ec->gpe, ec->command_addr, ec->data_addr); - - ret = ec_install_handlers(ec); + ret = acpi_config_boot_ec(ec, false); /* Reprobe devices depending on the EC */ acpi_walk_dep_device_list(ec->handle); @@ -1513,9 +1551,7 @@ static int acpi_ec_remove(struct acpi_device *device) release_region(ec->data_addr, 1); release_region(ec->command_addr, 1); device->driver_data = NULL; - if (ec == first_ec) - first_ec = NULL; - kfree(ec); + acpi_ec_free(ec); return 0; } @@ -1567,13 +1603,10 @@ int __init acpi_ec_dsdt_probe(void) ret = -ENODEV; goto error; } - ret = ec_install_handlers(ec); - + ret = acpi_config_boot_ec(ec, false); error: if (ret) - kfree(ec); - else - first_ec = boot_ec = ec; + acpi_ec_free(ec); return ret; } @@ -1671,7 +1704,6 @@ int __init acpi_ec_ecdt_probe(void) goto error; } - pr_info("EC description table is found, configuring boot EC\n"); if (EC_FLAGS_CORRECT_ECDT) { ec->command_addr = ecdt_ptr->data.address; ec->data_addr = ecdt_ptr->control.address; @@ -1681,12 +1713,10 @@ int __init acpi_ec_ecdt_probe(void) } ec->gpe = ecdt_ptr->gpe; ec->handle = ACPI_ROOT_OBJECT; - ret = ec_install_handlers(ec); + ret = acpi_config_boot_ec(ec, true); error: if (ret) - kfree(ec); - else - first_ec = boot_ec = ec; + acpi_ec_free(ec); return ret; } |