Commit d4536a21 authored by Prashant Malani's avatar Prashant Malani
Browse files

platform/chrome: cros_typec_switch: Set EC retimer 



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

Signed-off-by: default avatarPrashant Malani <pmalani@chromium.org>
Reviewed-by: default avatarTzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220816214857.2088914-4-pmalani@chromium.org
parent affc804c

drivers/platform/chrome/cros_typec_switch.c

+52 −1
Original line number Diff line number Diff line
@@ -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 +31,57 @@ 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 ec_params_typec_control req = {

		.port = port_num,

		.command = TYPEC_CONTROL_COMMAND_USB_MUX_SET,

		.mux_params = {

			.mux_index = index,

			.mux_flags = state,

		},

	};



	return cros_ec_cmd(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 ChromeOS 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)