diff options
Diffstat (limited to 'drivers/acpi/ec.c')
| -rw-r--r-- | drivers/acpi/ec.c | 175 |
1 files changed, 125 insertions, 50 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index ffb8361bc1b..10e851021ec 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -34,6 +34,7 @@ #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/interrupt.h> +#include <linux/list.h> #include <asm/io.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> @@ -43,6 +44,7 @@ #define ACPI_EC_HID "PNP0C09" #define ACPI_EC_DEVICE_NAME "Embedded Controller" #define ACPI_EC_FILE_INFO "info" + #undef PREFIX #define PREFIX "ACPI: EC: " @@ -60,6 +62,7 @@ enum ec_command { ACPI_EC_BURST_DISABLE = 0x83, ACPI_EC_COMMAND_QUERY = 0x84, }; + /* EC events */ enum ec_event { ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */ @@ -93,6 +96,16 @@ static struct acpi_driver acpi_ec_driver = { /* 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); + +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_ec { acpi_handle handle; unsigned long gpe; @@ -103,6 +116,7 @@ static struct acpi_ec { atomic_t query_pending; atomic_t event_count; wait_queue_head_t wait; + struct list_head list; } *boot_ec, *first_ec; /* -------------------------------------------------------------------------- @@ -393,21 +407,67 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data) /* -------------------------------------------------------------------------- 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_tail(&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; + mutex_lock(&ec->lock); + list_for_each_entry(handler, &ec->list, node) { + if (query_bit == handler->query_bit) { + list_del(&handler->node); + kfree(handler); + break; + } + } + 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); + printk(KERN_ERR PREFIX "Handler for query 0x%x is not found!\n", value); } static u32 acpi_ec_gpe_handler(void *data) @@ -426,8 +486,7 @@ static u32 acpi_ec_gpe_handler(void *data) 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_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec); } return status == AE_OK ? @@ -574,9 +633,6 @@ static int acpi_ec_remove_fs(struct acpi_device *device) 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); @@ -587,13 +643,52 @@ static struct acpi_ec *make_acpi_ec(void) atomic_set(&ec->event_count, 1); mutex_init(&ec->lock); init_waitqueue_head(&ec->wait); + INIT_LIST_HEAD(&ec->list); return ec; } +static acpi_status +acpi_ec_register_query_methods(acpi_handle handle, u32 level, + void *context, void **return_value) +{ + struct acpi_namespace_node *node = handle; + struct acpi_ec *ec = context; + int value = 0; + if (sscanf(node->name.ascii, "_Q%x", &value) == 1) { + acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); + } + return AE_OK; +} + +static int ec_parse_device(struct acpi_ec *ec, acpi_handle handle) +{ + if (ACPI_FAILURE(acpi_walk_resources(handle, METHOD_NAME__CRS, + ec_parse_io_ports, ec))) + return -EINVAL; + + /* Get GPE bit assignment (EC events). */ + /* TODO: Add support for _GPE returning a package */ + if (ACPI_FAILURE(acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe))) + return -EINVAL; + + /* Use the global lock for all EC transactions? */ + acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock); + + /* Find and register all query methods */ + acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1, + acpi_ec_register_query_methods, ec, NULL); + + ec->handle = handle; + + printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx", + ec->gpe, ec->command_addr, ec->data_addr); + + return 0; +} + static int acpi_ec_add(struct acpi_device *device) { - acpi_status status = AE_OK; struct acpi_ec *ec = NULL; if (!device) @@ -606,8 +701,7 @@ static int acpi_ec_add(struct acpi_device *device) if (!ec) return -ENOMEM; - status = ec_parse_device(device->handle, 0, ec, NULL); - if (status != AE_CTRL_TERMINATE) { + if (ec_parse_device(ec, device->handle)) { kfree(ec); return -EINVAL; } @@ -618,6 +712,8 @@ static int acpi_ec_add(struct acpi_device *device) /* We might have incorrect info for GL at boot time */ mutex_lock(&boot_ec->lock); boot_ec->global_lock = ec->global_lock; + /* Copy handlers from new ec into boot ec */ + list_splice(&ec->list, &boot_ec->list); mutex_unlock(&boot_ec->lock); kfree(ec); ec = boot_ec; @@ -628,18 +724,24 @@ static int acpi_ec_add(struct acpi_device *device) acpi_driver_data(device) = ec; acpi_ec_add_fs(device); - return 0; } static int acpi_ec_remove(struct acpi_device *device, int type) { struct acpi_ec *ec; + struct acpi_ec_query_handler *handler; if (!device) return -EINVAL; ec = acpi_driver_data(device); + mutex_lock(&ec->lock); + list_for_each_entry(handler, &ec->list, node) { + list_del(&handler->node); + kfree(handler); + } + mutex_unlock(&ec->lock); acpi_ec_remove_fs(device); acpi_driver_data(device) = NULL; if (ec == first_ec) @@ -695,15 +797,13 @@ static int ec_install_handlers(struct acpi_ec *ec) 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; + int ret = 0; if (!device) return -EINVAL; @@ -714,10 +814,13 @@ static int acpi_ec_start(struct acpi_device *device) return -EINVAL; /* Boot EC is already working */ - if (ec == boot_ec) - return 0; + if (ec != boot_ec) + ret = ec_install_handlers(ec); + + /* EC is fully operational, allow queries */ + atomic_set(&ec->query_pending, 0); - return ec_install_handlers(ec); + return ret; } static int acpi_ec_stop(struct acpi_device *device, int type) @@ -749,34 +852,6 @@ static int acpi_ec_stop(struct acpi_device *device, int type) return 0; } -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; - - printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx", - ec->gpe, ec->command_addr, ec->data_addr); - - return AE_CTRL_TERMINATE; -} - int __init acpi_ec_ecdt_probe(void) { int ret; |