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authorSimon Glass <sjg@chromium.org>2020-07-07 13:12:00 -0600
committerBin Meng <bmeng.cn@gmail.com>2020-07-17 14:32:24 +0800
commitf9189d5ada8d48932463dc1d56ea4d44c050ebbd (patch)
treeac8c5c634ce28b5f31a35ab4586163df375d1ab9 /lib
parent9c70e7e556339ce9fa864782445f7927fafc5c03 (diff)
acpi: Add support for writing a Power Resource
These are used in ACPI to disable power to various pats of the system when in sleep. Add a way to create a power resource, with the caller finishing off the details. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/acpi/acpigen.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c
index 4fd29ccb81..70d734245b 100644
--- a/lib/acpi/acpigen.c
+++ b/lib/acpi/acpigen.c
@@ -328,6 +328,28 @@ int acpigen_write_uuid(struct acpi_ctx *ctx, const char *uuid)
return 0;
}
+void acpigen_write_power_res(struct acpi_ctx *ctx, const char *name, uint level,
+ uint order, const char *const dev_states[],
+ size_t dev_states_count)
+{
+ size_t i;
+
+ for (i = 0; i < dev_states_count; i++) {
+ acpigen_write_name(ctx, dev_states[i]);
+ acpigen_write_package(ctx, 1);
+ acpigen_emit_simple_namestring(ctx, name);
+ acpigen_pop_len(ctx); /* Package */
+ }
+
+ acpigen_emit_ext_op(ctx, POWER_RES_OP);
+
+ acpigen_write_len_f(ctx);
+
+ acpigen_emit_simple_namestring(ctx, name);
+ acpigen_emit_byte(ctx, level);
+ acpigen_emit_word(ctx, order);
+}
+
/* Sleep (ms) */
void acpigen_write_sleep(struct acpi_ctx *ctx, u64 sleep_ms)
{