src/mainboard/lenovo/s230u/ec.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include "ec.h"
   4 #include <ec/compal/ene932/ec.h>
   5
   6 /* The keyboard matrix tells the EC how the keyboard is wired internally */
   7 static void set_keyboard_matrix_us(void)
   8 {
   9         ec_kbc_write_cmd(0x59);
  10         ec_kbc_write_ib(0xE5);
  11 }
  12
  13 /* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs */
  14 static void enter_apm_mode(void)
  15 {
  16         ec_kbc_write_cmd(0x59);
  17         ec_kbc_write_ib(0xE9);
  18 }
  19
  20 void lenovo_s230u_ec_init(void)
  21 {
  22         set_keyboard_matrix_us();
  23
  24         /*
  25          * The EC has a special "blinking Caps Lock LED" mode which it normally
  26          * enters when it believes the OS is not responding. It occasionally
  27          * disables battery charging when in this mode, although other
  28          * functionality is unaffected. Although the EC starts in APM mode by
  29          * default, it only leaves the "blinking Caps Lock LED" mode after
  30          * receiving the following command.
  31          */
  32         enter_apm_mode();
  33
  34         /* Enable external USB port power. */
  35         ec_mm_set_bit(0x3b, 4);
  36 }