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ec/dell/mec5035: Add command to control radio state 

This was determined by sniffing the LPC bus while moving the hardware
wireless switch between the enabled and disabled positions on the
Latitude E6400. The vendor BIOS provides options to change which radios
the switch controls, which was used to determine the mapping between
each radio device and the command argument values.

Change-Id: I173dc197d63cda232dd7ede0cb798ab0a364482b
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77534
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
This commit is contained in:
Nicholas Chin 2023-08-27 17:36:36 -06:00 committed by Felix Held
parent 5991754451
commit 2f48eaf36f
2 changed files with 23 additions and 0 deletions
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9
src/ec/dell/mec5035/mec5035.c
View File

@ -84,6 +84,15 @@ u8 mec5035_mouse_touchpad(u8 setting)
return buf[0];
}
void mec5035_control_radio(enum ec_radio_dev dev, enum ec_radio_state state)
{
/* From LPC traces and userspace testing with other values,
the second byte has to be 2 for an unknown reason. */
u8 buf[RADIO_CTRL_NUM_ARGS] = {(u8)dev, 2, (u8)state};
write_mailbox_regs(buf, 2, RADIO_CTRL_NUM_ARGS);
ec_command(CMD_RADIO_CTRL);
}
void mec5035_early_init(void)
{
/* If this isn't sent the EC shuts down the system after about 15

14
src/ec/dell/mec5035/mec5035.h
View File

@ -16,8 +16,22 @@
#define CMD_CPU_OK 0xc2
#define CMD_RADIO_CTRL 0x2b
#define RADIO_CTRL_NUM_ARGS 3
enum ec_radio_dev {
RADIO_WLAN = 0,
RADIO_WWAN,
RADIO_BT
};
enum ec_radio_state {
RADIO_OFF = 0,
RADIO_ON
};
u8 mec5035_mouse_touchpad(u8 setting);
void mec5035_cpu_ok(void);
void mec5035_early_init(void);
void mec5035_control_radio(enum ec_radio_dev device, enum ec_radio_state state);
#endif /* _EC_DELL_MEC5035_H_ */