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platform/chrome: cros_typec_switch: Set EC retimer

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Invoke Chrome EC host commands to set EC-controlled retimer switches to
the state the Type-C framework instructs.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20220711072333.2064341-6-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Prashant Malani
2022-07-11 07:22:59 +00:00
committed by Greg Kroah-Hartman
parent e54369058f
commit 34f375f0fd
1 changed files with 55 additions and 1 deletions
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56
drivers/platform/chrome/cros_typec_switch.c
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@@ -9,7 +9,10 @@
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_device.h>
#include <linux/usb/typec_altmode.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_retimer.h>
#define DRV_NAME "cros-typec-switch"
@@ -28,9 +31,60 @@ struct cros_typec_switch_data {
struct cros_typec_port *ports[EC_USB_PD_MAX_PORTS];
};
static int cros_typec_cmd_mux_set(struct cros_typec_switch_data *sdata, int port_num, u8 index,
u8 state)
{
struct typec_usb_mux_set params = {
.mux_index = index,
.mux_flags = state,
};
struct ec_params_typec_control req = {
.port = port_num,
.command = TYPEC_CONTROL_COMMAND_USB_MUX_SET,
.mux_params = params,
};
return cros_ec_command(sdata->ec, 0, EC_CMD_TYPEC_CONTROL, &req,
sizeof(req), NULL, 0);
}
static int cros_typec_get_mux_state(unsigned long mode, struct typec_altmode *alt)
{
int ret = -EOPNOTSUPP;
if (mode == TYPEC_STATE_SAFE)
ret = USB_PD_MUX_SAFE_MODE;
else if (mode == TYPEC_STATE_USB)
ret = USB_PD_MUX_USB_ENABLED;
else if (alt && alt->svid == USB_TYPEC_DP_SID)
ret = USB_PD_MUX_DP_ENABLED;
return ret;
}
/*
* The Chrome EC treats both mode-switches and retimers as "muxes" for the purposes of the
* host command API. This common function configures and verifies the retimer/mode-switch
* according to the provided setting.
*/
static int cros_typec_configure_mux(struct cros_typec_switch_data *sdata, int port_num, int index,
unsigned long mode, struct typec_altmode *alt)
{
int ret = cros_typec_get_mux_state(mode, alt);
if (ret < 0)
return ret;
return cros_typec_cmd_mux_set(sdata, port_num, index, (u8)ret);
}
static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
{
return 0;
struct cros_typec_port *port = typec_retimer_get_drvdata(retimer);
/* Retimers have index 1. */
return cros_typec_configure_mux(port->sdata, port->port_num, 1, state->mode, state->alt);
}
static void cros_typec_unregister_switches(struct cros_typec_switch_data *sdata)