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-rw-r--r--src/acpi/acpigen_dsm.c23
1 files changed, 11 insertions, 12 deletions
diff --git a/src/acpi/acpigen_dsm.c b/src/acpi/acpigen_dsm.c
index 2336537d0b..fc53ddff4d 100644
--- a/src/acpi/acpigen_dsm.c
+++ b/src/acpi/acpigen_dsm.c
@@ -7,28 +7,27 @@
#define ACPI_DSM_I2C_HID_UUID "3CDFF6F7-4267-4555-AD05-B30A3D8938DE"
+/* I2C HID currently supports revision 1 only, for which, only 1 additional
+ * function is supported. Thus, the query function should return 0x3:
+ * bit 0 = additional function supported
+ * bit 1 = function with index 1 supported
+ * All other revisions do not support additional functions and hence return 0
+*/
+
static void i2c_hid_func0_cb(void *arg)
{
/* ToInteger (Arg1, Local2) */
acpigen_write_to_integer(ARG1_OP, LOCAL2_OP);
- /* If (LEqual (Local2, 0x0)) */
- acpigen_write_if_lequal_op_int(LOCAL2_OP, 0x0);
- /* Return (Buffer (One) { 0x1f }) */
- acpigen_write_return_singleton_buffer(0x1f);
- acpigen_pop_len(); /* Pop : If */
- /* Else */
- acpigen_write_else();
- /* If (LEqual (Local2, 0x1)) */
+ /* If (LEqual (Local2, 0x1)) */
acpigen_write_if_lequal_op_int(LOCAL2_OP, 0x1);
- /* Return (Buffer (One) { 0x3f }) */
- acpigen_write_return_singleton_buffer(0x3f);
+ /* Return (Buffer (One) { 0x3 }) */
+ acpigen_write_return_singleton_buffer(0x3);
acpigen_pop_len(); /* Pop : If */
- /* Else */
+ /* Else */
acpigen_write_else();
/* Return (Buffer (One) { 0x0 }) */
acpigen_write_return_singleton_buffer(0x0);
acpigen_pop_len(); /* Pop : Else */
- acpigen_pop_len(); /* Pop : Else */
}
static void i2c_hid_func1_cb(void *arg)