diff options
| author | Prashant Malani <pmalani@chromium.org> | 2022-07-11 07:22:59 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-07-15 14:44:08 +0200 |
| commit | 34f375f0fdf67f8804142fa37a28e73426d4c1df (patch) | |
| tree | 16b88cadb6a7a55b57aa9af1c24b141f96cdd6d4 /drivers | |
| parent | e54369058f3da181fcc4c893f224a0c5a8a526b6 (diff) | |
| download | linux-34f375f0fdf67f8804142fa37a28e73426d4c1df.tar.bz2 | |
platform/chrome: cros_typec_switch: Set EC retimer
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/chrome/cros_typec_switch.c | 56 |
1 files changed, 55 insertions, 1 deletions
diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c index 0d319e315d57..b50ecedce662 100644 --- a/drivers/platform/chrome/cros_typec_switch.c +++ b/drivers/platform/chrome/cros_typec_switch.c @@ -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) |