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platform/chrome: cros_typec_switch: Register mode switches

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Register mode switch devices for Type-C connectors, when they are
specified by firmware. These control Type-C configuration for any USB
Type-C mode switches (sometimes known as "muxes") which are controlled
by the ChromeOS EC.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220816214857.2088914-6-pmalani@chromium.org
This commit is contained in:
Prashant Malani 2022-08-16 21:48:33 +00:00
parent cf6c767244
commit 9e6e051699
1 changed files with 40 additions and 0 deletions
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40
drivers/platform/chrome/cros_typec_switch.c
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@ -15,6 +15,7 @@
#include <linux/platform_device.h>
#include <linux/usb/typec_altmode.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_mux.h>
#include <linux/usb/typec_retimer.h>
#define DRV_NAME "cros-typec-switch"
@ -22,6 +23,7 @@
/* Handles and other relevant data required for each port's switches. */
struct cros_typec_port {
int port_num;
struct typec_mux_dev *mode_switch;
struct typec_retimer *retimer;
struct cros_typec_switch_data *sdata;
};
@ -143,6 +145,15 @@ static int cros_typec_configure_mux(struct cros_typec_switch_data *sdata, int po
return -ETIMEDOUT;
}
static int cros_typec_mode_switch_set(struct typec_mux_dev *mode_switch,
struct typec_mux_state *state)
{
struct cros_typec_port *port = typec_mux_get_drvdata(mode_switch);
/* Mode switches have index 0. */
return cros_typec_configure_mux(port->sdata, port->port_num, 0, state->mode, state->alt);
}
static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
{
struct cros_typec_port *port = typec_retimer_get_drvdata(retimer);
@ -159,9 +170,27 @@ static void cros_typec_unregister_switches(struct cros_typec_switch_data *sdata)
if (!sdata->ports[i])
continue;
typec_retimer_unregister(sdata->ports[i]->retimer);
typec_mux_unregister(sdata->ports[i]->mode_switch);
}
}
static int cros_typec_register_mode_switch(struct cros_typec_port *port,
struct fwnode_handle *fwnode)
{
struct typec_mux_desc mode_switch_desc = {
.fwnode = fwnode,
.drvdata = port,
.name = fwnode_get_name(fwnode),
.set = cros_typec_mode_switch_set,
};
port->mode_switch = typec_mux_register(port->sdata->dev, &mode_switch_desc);
if (IS_ERR(port->mode_switch))
return PTR_ERR(port->mode_switch);
return 0;
}
static int cros_typec_register_retimer(struct cros_typec_port *port, struct fwnode_handle *fwnode)
{
struct typec_retimer_desc retimer_desc = {
@ -230,6 +259,17 @@ static int cros_typec_register_switches(struct cros_typec_switch_data *sdata)
}
dev_dbg(dev, "Retimer switch registered for index %llu\n", index);
if (!device_property_present(fwnode->dev, "mode-switch"))
continue;
ret = cros_typec_register_mode_switch(port, fwnode);
if (ret) {
dev_err(dev, "Mode switch register failed\n");
goto err_switch;
}
dev_dbg(dev, "Mode switch registered for index %llu\n", index);
}
return 0;