diff options
author | Prashant Malani <pmalani@chromium.org> | 2022-08-16 21:48:31 +0000 |
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committer | Prashant Malani <pmalani@chromium.org> | 2022-08-18 22:20:35 +0000 |
commit | d4536a216c3f8ea0abcf90110750eb297ce48b45 (patch) | |
tree | d56b3c90f32afe5a0c8d1fa3bd033496b384b54d /drivers/platform | |
parent | affc804c44c8259ae53423aa3b5c20907e3a9a34 (diff) | |
download | linux-d4536a216c3f8ea0abcf90110750eb297ce48b45.tar.bz2 |
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: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220816214857.2088914-4-pmalani@chromium.org
Diffstat (limited to 'drivers/platform')
-rw-r--r-- | drivers/platform/chrome/cros_typec_switch.c | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c index db773bf57899..eae7d26416aa 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 +31,57 @@ 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) |