ACPI EC: Add support for non-AML EC query handlers
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>hifive-unleashed-5.1
Alexey Starikovskiy
Len Brown
parent
4350933a74
commit
837012ede1
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@ -34,6 +34,7 @@
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <asm/io.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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@ -43,6 +44,7 @@
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#define ACPI_EC_HID "PNP0C09"
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#define ACPI_EC_DEVICE_NAME "Embedded Controller"
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#define ACPI_EC_FILE_INFO "info"
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#undef PREFIX
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#define PREFIX "ACPI: EC: "
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@ -60,6 +62,7 @@ enum ec_command {
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ACPI_EC_BURST_DISABLE = 0x83,
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ACPI_EC_COMMAND_QUERY = 0x84,
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};
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/* EC events */
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enum ec_event {
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ACPI_EC_EVENT_OBF_1 = 1, /* Output buffer full */
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@ -93,6 +96,16 @@ static struct acpi_driver acpi_ec_driver = {
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/* If we find an EC via the ECDT, we need to keep a ptr to its context */
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/* External interfaces use first EC only, so remember */
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typedef int (*acpi_ec_query_func) (void *data);
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struct acpi_ec_query_handler {
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struct list_head node;
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acpi_ec_query_func func;
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acpi_handle handle;
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void *data;
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u8 query_bit;
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};
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static struct acpi_ec {
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acpi_handle handle;
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unsigned long gpe;
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@ -103,6 +116,7 @@ static struct acpi_ec {
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atomic_t query_pending;
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atomic_t event_count;
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wait_queue_head_t wait;
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struct list_head list;
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} *boot_ec, *first_ec;
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/* --------------------------------------------------------------------------
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@ -393,21 +407,67 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 * data)
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/* --------------------------------------------------------------------------
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Event Management
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-------------------------------------------------------------------------- */
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int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit,
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acpi_handle handle, acpi_ec_query_func func,
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void *data)
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{
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struct acpi_ec_query_handler *handler =
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kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL);
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if (!handler)
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return -ENOMEM;
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handler->query_bit = query_bit;
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handler->handle = handle;
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handler->func = func;
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handler->data = data;
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mutex_lock(&ec->lock);
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list_add_tail(&handler->node, &ec->list);
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mutex_unlock(&ec->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler);
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void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit)
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{
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struct acpi_ec_query_handler *handler;
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mutex_lock(&ec->lock);
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list_for_each_entry(handler, &ec->list, node) {
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if (query_bit == handler->query_bit) {
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list_del(&handler->node);
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kfree(handler);
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break;
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}
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}
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mutex_unlock(&ec->lock);
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}
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EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler);
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static void acpi_ec_gpe_query(void *ec_cxt)
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{
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struct acpi_ec *ec = ec_cxt;
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u8 value = 0;
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char object_name[8];
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struct acpi_ec_query_handler *handler, copy;
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if (!ec || acpi_ec_query(ec, &value))
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return;
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snprintf(object_name, 8, "_Q%2.2X", value);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Evaluating %s", object_name));
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acpi_evaluate_object(ec->handle, object_name, NULL, NULL);
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mutex_lock(&ec->lock);
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list_for_each_entry(handler, &ec->list, node) {
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if (value == handler->query_bit) {
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/* have custom handler for this bit */
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memcpy(©, handler, sizeof(copy));
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mutex_unlock(&ec->lock);
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if (copy.func) {
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copy.func(copy.data);
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} else if (copy.handle) {
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acpi_evaluate_object(copy.handle, NULL, NULL, NULL);
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}
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return;
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}
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}
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mutex_unlock(&ec->lock);
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printk(KERN_ERR PREFIX "Handler for query 0x%x is not found!\n", value);
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}
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static u32 acpi_ec_gpe_handler(void *data)
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@ -426,8 +486,7 @@ static u32 acpi_ec_gpe_handler(void *data)
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if ((value & ACPI_EC_FLAG_SCI) && !atomic_read(&ec->query_pending)) {
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atomic_set(&ec->query_pending, 1);
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status =
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acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query,
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ec);
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acpi_os_execute(OSL_EC_BURST_HANDLER, acpi_ec_gpe_query, ec);
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}
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return status == AE_OK ?
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@ -574,9 +633,6 @@ static int acpi_ec_remove_fs(struct acpi_device *device)
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static acpi_status
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ec_parse_io_ports(struct acpi_resource *resource, void *context);
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static acpi_status
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ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval);
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static struct acpi_ec *make_acpi_ec(void)
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{
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struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL);
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@ -587,13 +643,52 @@ static struct acpi_ec *make_acpi_ec(void)
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atomic_set(&ec->event_count, 1);
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mutex_init(&ec->lock);
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init_waitqueue_head(&ec->wait);
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INIT_LIST_HEAD(&ec->list);
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return ec;
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}
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static acpi_status
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acpi_ec_register_query_methods(acpi_handle handle, u32 level,
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void *context, void **return_value)
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{
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struct acpi_namespace_node *node = handle;
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struct acpi_ec *ec = context;
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int value = 0;
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if (sscanf(node->name.ascii, "_Q%x", &value) == 1) {
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acpi_ec_add_query_handler(ec, value, handle, NULL, NULL);
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}
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return AE_OK;
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}
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static int ec_parse_device(struct acpi_ec *ec, acpi_handle handle)
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{
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if (ACPI_FAILURE(acpi_walk_resources(handle, METHOD_NAME__CRS,
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ec_parse_io_ports, ec)))
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return -EINVAL;
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/* Get GPE bit assignment (EC events). */
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/* TODO: Add support for _GPE returning a package */
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if (ACPI_FAILURE(acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe)))
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return -EINVAL;
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/* Use the global lock for all EC transactions? */
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acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
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/* Find and register all query methods */
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acpi_walk_namespace(ACPI_TYPE_METHOD, handle, 1,
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acpi_ec_register_query_methods, ec, NULL);
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ec->handle = handle;
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printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx",
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ec->gpe, ec->command_addr, ec->data_addr);
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return 0;
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}
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static int acpi_ec_add(struct acpi_device *device)
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{
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acpi_status status = AE_OK;
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struct acpi_ec *ec = NULL;
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if (!device)
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@ -606,8 +701,7 @@ static int acpi_ec_add(struct acpi_device *device)
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if (!ec)
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return -ENOMEM;
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status = ec_parse_device(device->handle, 0, ec, NULL);
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if (status != AE_CTRL_TERMINATE) {
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if (ec_parse_device(ec, device->handle)) {
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kfree(ec);
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return -EINVAL;
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}
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@ -618,6 +712,8 @@ static int acpi_ec_add(struct acpi_device *device)
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/* We might have incorrect info for GL at boot time */
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mutex_lock(&boot_ec->lock);
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boot_ec->global_lock = ec->global_lock;
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/* Copy handlers from new ec into boot ec */
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list_splice(&ec->list, &boot_ec->list);
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mutex_unlock(&boot_ec->lock);
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kfree(ec);
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ec = boot_ec;
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@ -628,18 +724,24 @@ static int acpi_ec_add(struct acpi_device *device)
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acpi_driver_data(device) = ec;
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acpi_ec_add_fs(device);
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return 0;
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}
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static int acpi_ec_remove(struct acpi_device *device, int type)
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{
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struct acpi_ec *ec;
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struct acpi_ec_query_handler *handler;
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if (!device)
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return -EINVAL;
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ec = acpi_driver_data(device);
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mutex_lock(&ec->lock);
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list_for_each_entry(handler, &ec->list, node) {
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list_del(&handler->node);
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kfree(handler);
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}
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mutex_unlock(&ec->lock);
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acpi_ec_remove_fs(device);
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acpi_driver_data(device) = NULL;
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if (ec == first_ec)
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@ -695,15 +797,13 @@ static int ec_install_handlers(struct acpi_ec *ec)
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return -ENODEV;
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}
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/* EC is fully operational, allow queries */
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atomic_set(&ec->query_pending, 0);
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return 0;
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}
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static int acpi_ec_start(struct acpi_device *device)
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{
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struct acpi_ec *ec;
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int ret = 0;
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if (!device)
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return -EINVAL;
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@ -714,10 +814,13 @@ static int acpi_ec_start(struct acpi_device *device)
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return -EINVAL;
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/* Boot EC is already working */
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if (ec == boot_ec)
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return 0;
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if (ec != boot_ec)
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ret = ec_install_handlers(ec);
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return ec_install_handlers(ec);
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/* EC is fully operational, allow queries */
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atomic_set(&ec->query_pending, 0);
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return ret;
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}
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static int acpi_ec_stop(struct acpi_device *device, int type)
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@ -749,34 +852,6 @@ static int acpi_ec_stop(struct acpi_device *device, int type)
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return 0;
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}
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static acpi_status
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ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval)
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{
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acpi_status status;
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struct acpi_ec *ec = context;
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status = acpi_walk_resources(handle, METHOD_NAME__CRS,
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ec_parse_io_ports, ec);
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if (ACPI_FAILURE(status))
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return status;
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/* Get GPE bit assignment (EC events). */
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/* TODO: Add support for _GPE returning a package */
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status = acpi_evaluate_integer(handle, "_GPE", NULL, &ec->gpe);
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if (ACPI_FAILURE(status))
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return status;
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/* Use the global lock for all EC transactions? */
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acpi_evaluate_integer(handle, "_GLK", NULL, &ec->global_lock);
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ec->handle = handle;
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printk(KERN_INFO PREFIX "GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx",
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ec->gpe, ec->command_addr, ec->data_addr);
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return AE_CTRL_TERMINATE;
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}
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int __init acpi_ec_ecdt_probe(void)
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{
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int ret;
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