From patchwork Fri Jun 8 11:29:39 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Heikki Krogerus X-Patchwork-Id: 10454185 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A3C5860159 for ; Fri, 8 Jun 2018 11:30:35 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8E52D29478 for ; Fri, 8 Jun 2018 11:30:35 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8186B2947F; Fri, 8 Jun 2018 11:30:35 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5AB7629478 for ; Fri, 8 Jun 2018 11:30:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751384AbeFHLaB (ORCPT ); Fri, 8 Jun 2018 07:30:01 -0400 Received: from mga17.intel.com ([192.55.52.151]:32423 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752872AbeFHL37 (ORCPT ); Fri, 8 Jun 2018 07:29:59 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Jun 2018 04:29:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,490,1520924400"; d="scan'208";a="62389003" Received: from black.fi.intel.com (HELO black.fi.intel.com.) ([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 08 Jun 2018 04:29:56 -0700 From: Heikki Krogerus To: Guenter Roeck , Hans de Goede Cc: Greg Kroah-Hartman , Jun Li , Mats Karrman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v4 6/8] usb: typec: Add driver for DisplayPort alternate mode Date: Fri, 8 Jun 2018 14:29:39 +0300 Message-Id: <20180608112941.26332-7-heikki.krogerus@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180608112941.26332-1-heikki.krogerus@linux.intel.com> References: <20180608112941.26332-1-heikki.krogerus@linux.intel.com> Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP DisplayPort USB Type-C Alt Mode allows DisplayPort displays and adapters to be attached to the USB Type-C ports on the system. Signed-off-by: Heikki Krogerus --- .../testing/sysfs-driver-typec-displayport | 49 ++ drivers/usb/typec/Kconfig | 2 + drivers/usb/typec/Makefile | 1 + drivers/usb/typec/altmodes/Kconfig | 14 + drivers/usb/typec/altmodes/Makefile | 2 + drivers/usb/typec/altmodes/displayport.c | 543 ++++++++++++++++++ include/linux/usb/typec_dp.h | 70 +++ 7 files changed, 681 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-typec-displayport create mode 100644 drivers/usb/typec/altmodes/Kconfig create mode 100644 drivers/usb/typec/altmodes/Makefile create mode 100644 drivers/usb/typec/altmodes/displayport.c create mode 100644 include/linux/usb/typec_dp.h diff --git a/Documentation/ABI/testing/sysfs-driver-typec-displayport b/Documentation/ABI/testing/sysfs-driver-typec-displayport new file mode 100644 index 000000000000..66d72185cfd5 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-typec-displayport @@ -0,0 +1,49 @@ +What: /sys/bus/typec/devices/.../displayport/configuration +Date: July 2018 +Contact: Heikki Krogerus +Description: + Shows the current DisplayPort configuration for the connector. + Valid values are USB, source and sink. Source means DisplayPort + source, and sink means DisplayPort sink. + + All supported configurations are listed as space separated list + with the active one wrapped in square brackets. + + Source example: + + USB [source] sink + + The configuration can be changed by writing to the file + + Note. USB configuration does not equal to Exit Mode. It is + separate configuration defined in VESA DisplayPort Alt Mode on + USB Type-C Standard. Functionally it equals to the situation + where the mode has been exited (to exit the mode, see + Documentation/ABI/testing/sysfs-bus-typec, and use file + /sys/bus/typec/devices/.../active). + +What: /sys/bus/typec/devices/.../displayport/pin_assignment +Date: July 2018 +Contact: Heikki Krogerus +Description: + VESA DisplayPort Alt Mode on USB Type-C Standard defines six + different pin assignments for USB Type-C connector that are + labeled A, B, C, D, E, and F. The supported pin assignments are + listed as space separated list with the active one wrapped in + square brackets. + + Example: + + C [D] + + Pin assignment can be changed by writing to the file. It is + possible to set pin assignment before configuration has been + set, but the assignment will not be active before the + connector is actually configured. + + Note. As of VESA DisplayPort Alt Mode on USB Type-C Standard + version 1.0b, pin assignments A, B, and F are deprecated. Only + pin assignments D can now carry simultaneously one channel of + USB SuperSpeed protocol. From user perspective pin assignments C + and E are equal, where all channels on the connector are used + for carrying DisplayPort protocol (allowing higher resolutions). diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig index 2c8eab11a493..652d49ede8b8 100644 --- a/drivers/usb/typec/Kconfig +++ b/drivers/usb/typec/Kconfig @@ -88,4 +88,6 @@ config TYPEC_TPS6598X source "drivers/usb/typec/mux/Kconfig" +source "drivers/usb/typec/altmodes/Kconfig" + endif # TYPEC diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile index 5466c62c8e97..65651ec65d19 100644 --- a/drivers/usb/typec/Makefile +++ b/drivers/usb/typec/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_TYPEC) += typec.o typec-y := class.o mux.o bus.o +obj-$(CONFIG_TYPEC) += altmodes/ obj-$(CONFIG_TYPEC_TCPM) += tcpm.o obj-y += fusb302/ obj-$(CONFIG_TYPEC_WCOVE) += typec_wcove.o diff --git a/drivers/usb/typec/altmodes/Kconfig b/drivers/usb/typec/altmodes/Kconfig new file mode 100644 index 000000000000..efef2a64bc51 --- /dev/null +++ b/drivers/usb/typec/altmodes/Kconfig @@ -0,0 +1,14 @@ + +menu "USB Type-C Alternate Mode drivers" + +config TYPEC_DP_ALTMODE + tristate "DisplayPort Alternate Mode driver" + help + DisplayPort USB Type-C Alternate Mode allows DisplayPort + displays and adapters to be attached to the USB Type-C + connectors on the system. + + To compile this driver as a module, choose M here: the + module will be called typec_displayport. + +endmenu diff --git a/drivers/usb/typec/altmodes/Makefile b/drivers/usb/typec/altmodes/Makefile new file mode 100644 index 000000000000..5caf094ef71a --- /dev/null +++ b/drivers/usb/typec/altmodes/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_TYPEC_DP_ALTMODE) += typec_displayport.o +typec_displayport-y := displayport.o diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c new file mode 100644 index 000000000000..a5054d86a4d9 --- /dev/null +++ b/drivers/usb/typec/altmodes/displayport.c @@ -0,0 +1,543 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * USB Typec-C DisplayPort Alternate Mode driver + * + * Copyright (C) 2018 Intel Corporation + * Author: Heikki Krogerus + * + * DisplayPort is trademark of VESA (www.vesa.org) + */ + +#include +#include +#include +#include +#include + +#define DP_HEADER(cmd) (VDO(USB_TYPEC_DP_SID, 1, cmd) | \ + VDO_OPOS(USB_TYPEC_DP_MODE)) + +/* DisplayPort alt mode specific commands */ +#define DP_CMD_STATUS_UPDATE VDO_CMD_VENDOR(0) +#define DP_CMD_CONFIGURE VDO_CMD_VENDOR(1) + +enum { + DP_CONF_USB, + DP_CONF_DFP_D, + DP_CONF_UFP_D, + DP_CONF_DUAL_D, +}; + +/* DisplayPort Capabilities VDO bits */ +#define DP_CAP_CAPABILITY(_cap_) ((_cap_) & 3) +#define DP_CAP_UFP_D 1 +#define DP_CAP_DFP_D 2 +#define DP_CAP_DFP_D_AND_UFP_D 3 +#define DP_CAP_DP_SIGNALING BIT(2) /* Always set */ +#define DP_CAP_GEN2 BIT(3) /* Reserved after v1.0b */ +#define DP_CAP_RECEPTACLE BIT(6) +#define DP_CAP_USB BIT(7) +#define DP_CAP_DFP_D_PIN_ASSIGN(_cap_) (((_cap_) & GENMASK(15, 8)) >> 8) +#define DP_CAP_UFP_D_PIN_ASSIGN(_cap_) (((_cap_) & GENMASK(23, 16)) >> 16) + +enum { + DP_PIN_ASSIGN_A, /* Not supported after v1.0b */ + DP_PIN_ASSIGN_B, /* Not supported after v1.0b */ + DP_PIN_ASSIGN_C, + DP_PIN_ASSIGN_D, + DP_PIN_ASSIGN_E, + DP_PIN_ASSIGN_F, /* Not supported after v1.0b */ +}; + +/* Helper for setting/getting the pin assignement value to the configuration */ +#define DP_CONF_SET_PIN_ASSIGN(_a_) ((_a_) << 8) +#define DP_CONF_GET_PIN_ASSIGN(_conf_) (((_conf_) & GENMASK(15, 8)) >> 8) + +/* Pin assignments that use USB3.1 Gen2 signaling to carry DP protocol */ +#define DP_PIN_ASSIGN_GEN2_BR_MASK (BIT(DP_PIN_ASSIGN_A) | \ + BIT(DP_PIN_ASSIGN_B)) + +/* Pin assignments that use DP v1.3 signaling to carry DP protocol */ +#define DP_PIN_ASSIGN_DP_BR_MASK (BIT(DP_PIN_ASSIGN_C) | \ + BIT(DP_PIN_ASSIGN_D) | \ + BIT(DP_PIN_ASSIGN_E) | \ + BIT(DP_PIN_ASSIGN_F)) + +/* DP only pin assignments */ +#define DP_PIN_ASSIGN_DP_ONLY_MASK (BIT(DP_PIN_ASSIGN_A) | \ + BIT(DP_PIN_ASSIGN_C) | \ + BIT(DP_PIN_ASSIGN_E)) + +/* Pin assignments where one channel is for USB */ +#define DP_PIN_ASSIGN_MULTI_FUNC_MASK (BIT(DP_PIN_ASSIGN_B) | \ + BIT(DP_PIN_ASSIGN_D) | \ + BIT(DP_PIN_ASSIGN_F)) + +enum dp_state { + DP_STATE_NONE, + DP_STATE_ENTER, + DP_STATE_UPDATE, + DP_STATE_CONFIGURE, + DP_STATE_EXIT, +}; + +struct dp_altmode { + struct typec_displayport_data data; + + enum dp_state state; + + struct mutex lock; + struct work_struct work; + struct typec_altmode *alt; + const struct typec_altmode *port; +}; + +static int dp_altmode_configure(struct dp_altmode *dp, u8 con) +{ + u32 conf = DP_CONF_SIGNALING_DP; /* Only DP signaling supported */ + u8 pin_assign = 0; + + switch (con) { + case DP_STATUS_CON_DISABLED: + dp->data.conf = 0; + return 0; + case DP_STATUS_CON_DFP_D: + conf |= DP_CONF_UFP_U_AS_DFP_D; + pin_assign = DP_CAP_UFP_D_PIN_ASSIGN(dp->alt->vdo) & + DP_CAP_DFP_D_PIN_ASSIGN(dp->port->vdo); + break; + case DP_STATUS_CON_UFP_D: + case DP_STATUS_CON_BOTH: /* NOTE: First acting as DP source */ + conf |= DP_CONF_UFP_U_AS_UFP_D; + pin_assign = DP_CAP_DFP_D_PIN_ASSIGN(dp->alt->vdo) & + DP_CAP_UFP_D_PIN_ASSIGN(dp->port->vdo); + break; + default: + break; + } + + /* Determining the initial pin assignment. */ + if (!DP_CONF_GET_PIN_ASSIGN(dp->data.conf)) { + /* Is USB together with DP preferred */ + if (dp->data.status & DP_STATUS_PREFER_MULTI_FUNC && + pin_assign & DP_PIN_ASSIGN_MULTI_FUNC_MASK) + pin_assign &= DP_PIN_ASSIGN_MULTI_FUNC_MASK; + else + pin_assign &= DP_PIN_ASSIGN_DP_ONLY_MASK; + + if (!pin_assign) + return -EINVAL; + + conf |= DP_CONF_SET_PIN_ASSIGN(pin_assign); + } + + dp->data.conf |= conf; + + return 0; +} + +static int dp_altmode_status_update(struct dp_altmode *dp) +{ + bool configured = !!DP_CONF_GET_PIN_ASSIGN(dp->data.conf); + u8 con = DP_STATUS_CONNECTION(dp->data.status); + int ret = 0; + + if (configured && (dp->data.status & DP_STATUS_SWITCH_TO_USB)) { + dp->data.conf = 0; + dp->state = DP_STATE_CONFIGURE; + } else if (dp->data.status & DP_STATUS_EXIT_DP_MODE) { + dp->state = DP_STATE_EXIT; + } else if (!(con & DP_CONF_CURRENTLY(dp->data.conf))) { + ret = dp_altmode_configure(dp, con); + if (!ret) + dp->state = DP_STATE_CONFIGURE; + } + + return ret; +} + +static int dp_altmode_configured(struct dp_altmode *dp) +{ + u8 state; + int ret; + + sysfs_notify(&dp->alt->dev.kobj, "displayport", "configuration"); + + if (!dp->data.conf) + return typec_altmode_notify(dp->alt, TYPEC_STATE_USB, + &dp->data); + + state = get_count_order(DP_CONF_GET_PIN_ASSIGN(dp->data.conf)); + ret = typec_altmode_notify(dp->alt, TYPEC_MODAL_STATE(state), + &dp->data); + if (ret) + return ret; + + sysfs_notify(&dp->alt->dev.kobj, "displayport", "pin_assignment"); + + return 0; +} + +static void dp_altmode_work(struct work_struct *work) +{ + struct dp_altmode *dp = container_of(work, struct dp_altmode, work); + u32 header = 0; + u32 vdo; + int ret; + + mutex_lock(&dp->lock); + + switch (dp->state) { + case DP_STATE_ENTER: + ret = typec_altmode_enter(dp->alt); + if (ret) + dev_err(&dp->alt->dev, "failed to enter mode\n"); + break; + case DP_STATE_UPDATE: + header = DP_HEADER(DP_CMD_STATUS_UPDATE); + vdo = 1; + break; + case DP_STATE_CONFIGURE: + ret = typec_altmode_notify(dp->alt, TYPEC_STATE_SAFE, + &dp->data); + if (ret) { + dev_err(&dp->alt->dev, + "unable to put to connector to safe mode\n"); + break; + } + header = DP_HEADER(DP_CMD_CONFIGURE); + vdo = dp->data.conf; + break; + case DP_STATE_EXIT: + if (typec_altmode_exit(dp->alt)) + dev_err(&dp->alt->dev, "Exit Mode Failed!\n"); + break; + default: + break; + } + + if (header) { + if (typec_altmode_vdm(dp->alt, header, &vdo, 2)) + dev_err(&dp->alt->dev, "unable to send VDM\n"); + } + + mutex_unlock(&dp->lock); +} + +static void dp_altmode_attention(struct typec_altmode *alt, const u32 vdo) +{ + struct dp_altmode *dp = typec_altmode_get_drvdata(alt); + u8 state; + + mutex_lock(&dp->lock); + + dp->state = DP_STATE_NONE; + dp->data.status = vdo; + dp_altmode_status_update(dp); + + if (dp->state == DP_STATE_NONE) { + state = get_count_order(DP_CONF_GET_PIN_ASSIGN(dp->data.conf)); + if (typec_altmode_notify(dp->alt, TYPEC_MODAL_STATE(state), + &dp->data)) + dev_err(&alt->dev, "%s: notification failed\n", + __func__); + } else { + schedule_work(&dp->work); + } + + mutex_unlock(&dp->lock); +} + +static int dp_altmode_vdm(struct typec_altmode *alt, + const u32 hdr, const u32 *vdo, int count) +{ + struct dp_altmode *dp = typec_altmode_get_drvdata(alt); + int cmd_type = PD_VDO_CMDT(hdr); + int cmd = PD_VDO_CMD(hdr); + int ret = 0; + + mutex_lock(&dp->lock); + + dp->state = DP_STATE_NONE; + + switch (cmd_type) { + case CMDT_RSP_ACK: + switch (cmd) { + case CMD_ENTER_MODE: + dp->state = DP_STATE_UPDATE; + break; + case CMD_EXIT_MODE: + dp->data.status = 0; + dp->data.conf = 0; + break; + case DP_CMD_STATUS_UPDATE: + dp->data.status = *vdo; + ret = dp_altmode_status_update(dp); + break; + case DP_CMD_CONFIGURE: + ret = dp_altmode_configured(dp); + break; + default: + break; + } + break; + case CMDT_RSP_NAK: + switch (cmd) { + case DP_CMD_CONFIGURE: + dp->data.conf = 0; + ret = dp_altmode_configured(dp); + break; + default: + break; + } + break; + default: + break; + } + + if (dp->state != DP_STATE_NONE) + schedule_work(&dp->work); + + mutex_unlock(&dp->lock); + return ret; +} + +static int dp_altmode_activate(struct typec_altmode *alt, int activate) +{ + return activate ? typec_altmode_enter(alt) : typec_altmode_exit(alt); +} + +static const struct typec_altmode_ops dp_altmode_ops = { + .attention = dp_altmode_attention, + .vdm = dp_altmode_vdm, + .activate = dp_altmode_activate, +}; + +static const char * const configurations[] = { + [DP_CONF_USB] = "USB", + [DP_CONF_DFP_D] = "source", + [DP_CONF_UFP_D] = "sink", +}; + +static ssize_t +configuration_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t size) +{ + struct dp_altmode *dp = dev_get_drvdata(dev); + int conf; + int ret; + + conf = sysfs_match_string(configurations, buf); + if (conf < 0) + return conf; + + mutex_lock(&dp->lock); + + ret = dp_altmode_configure(dp, conf); + if (!ret && dp->alt->active) { + dp->state = DP_STATE_CONFIGURE; + schedule_work(&dp->work); + } + + mutex_unlock(&dp->lock); + + return ret ? ret : size; +} + +static ssize_t configuration_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dp_altmode *dp = dev_get_drvdata(dev); + int len; + u8 cap; + u8 cur; + int i; + + mutex_lock(&dp->lock); + + cap = DP_CAP_CAPABILITY(dp->alt->vdo); + cur = DP_CONF_CURRENTLY(dp->data.conf); + + len = sprintf(buf, "%s ", cur ? "USB" : "[USB]"); + + for (i = 1; i < ARRAY_SIZE(configurations); i++) { + if (i == cur) + len += sprintf(buf + len, "[%s] ", configurations[i]); + else if ((i == DP_CONF_DFP_D && cap & DP_CAP_DFP_D) || + (i == DP_CONF_UFP_D && cap & DP_CAP_UFP_D)) + len += sprintf(buf + len, "%s ", configurations[i]); + } + + mutex_unlock(&dp->lock); + + buf[len - 1] = '\n'; + return len; +} +static DEVICE_ATTR_RW(configuration); + +static const char * const pin_assignments[] = { + [DP_PIN_ASSIGN_A] = "A", + [DP_PIN_ASSIGN_B] = "B", + [DP_PIN_ASSIGN_C] = "C", + [DP_PIN_ASSIGN_D] = "D", + [DP_PIN_ASSIGN_E] = "E", + [DP_PIN_ASSIGN_F] = "F", +}; + +static ssize_t +pin_assignment_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t size) +{ + struct dp_altmode *dp = dev_get_drvdata(dev); + u8 assignments; + u32 conf; + int ret; + + ret = sysfs_match_string(pin_assignments, buf); + if (ret < 0) + return ret; + + conf = DP_CONF_SET_PIN_ASSIGN(BIT(ret)); + ret = 0; + + mutex_lock(&dp->lock); + + if (conf & dp->data.conf) + goto out_unlock; + + if (DP_CONF_CURRENTLY(dp->data.conf) == DP_CONF_DFP_D) + assignments = DP_CAP_UFP_D_PIN_ASSIGN(dp->alt->vdo); + else + assignments = DP_CAP_DFP_D_PIN_ASSIGN(dp->alt->vdo); + + if (!(DP_CONF_GET_PIN_ASSIGN(conf) & assignments)) { + ret = -EINVAL; + goto out_unlock; + } + + /* Only send Configure command if a configuration has been set */ + if (dp->alt->active && DP_CONF_CURRENTLY(dp->data.conf)) { + dp->state = DP_STATE_CONFIGURE; + schedule_work(&dp->work); + } + + dp->data.conf &= ~DP_CONF_PIN_ASSIGNEMENT_MASK; + dp->data.conf |= conf; + +out_unlock: + mutex_unlock(&dp->lock); + + return ret ? ret : size; +} + +static ssize_t pin_assignment_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dp_altmode *dp = dev_get_drvdata(dev); + u8 assignments; + int len = 0; + u8 cur; + int i; + + mutex_lock(&dp->lock); + + cur = get_count_order(DP_CONF_GET_PIN_ASSIGN(dp->data.conf)); + + if (DP_CONF_CURRENTLY(dp->data.conf) == DP_CONF_DFP_D) + assignments = DP_CAP_UFP_D_PIN_ASSIGN(dp->alt->vdo); + else + assignments = DP_CAP_DFP_D_PIN_ASSIGN(dp->alt->vdo); + + for (i = 0; assignments; assignments >>= 1, i++) { + if (assignments & 1) { + if (i == cur) + len += sprintf(buf + len, "[%s] ", + pin_assignments[i]); + else + len += sprintf(buf + len, "%s ", + pin_assignments[i]); + } + } + + mutex_unlock(&dp->lock); + + buf[len - 1] = '\n'; + return len; +} +static DEVICE_ATTR_RW(pin_assignment); + +static struct attribute *dp_altmode_attrs[] = { + &dev_attr_configuration.attr, + &dev_attr_pin_assignment.attr, + NULL +}; + +static const struct attribute_group dp_altmode_group = { + .name = "displayport", + .attrs = dp_altmode_attrs, +}; + +static int dp_altmode_probe(struct typec_altmode *alt) +{ + const struct typec_altmode *port = typec_altmode_get_partner(alt); + struct dp_altmode *dp; + int ret; + + /* FIXME: Port can only be DFP_U. */ + + /* Make sure we have compatiple pin configurations */ + if (!(DP_CAP_DFP_D_PIN_ASSIGN(port->vdo) & + DP_CAP_UFP_D_PIN_ASSIGN(alt->vdo)) && + !(DP_CAP_UFP_D_PIN_ASSIGN(port->vdo) & + DP_CAP_DFP_D_PIN_ASSIGN(alt->vdo))) + return -ENODEV; + + ret = sysfs_create_group(&alt->dev.kobj, &dp_altmode_group); + if (ret) + return ret; + + dp = devm_kzalloc(&alt->dev, sizeof(*dp), GFP_KERNEL); + if (!dp) + return -ENOMEM; + + INIT_WORK(&dp->work, dp_altmode_work); + mutex_init(&dp->lock); + dp->port = port; + dp->alt = alt; + + alt->desc = "DisplayPort"; + alt->ops = &dp_altmode_ops; + + typec_altmode_set_drvdata(alt, dp); + + dp->state = DP_STATE_ENTER; + schedule_work(&dp->work); + + return 0; +} + +static void dp_altmode_remove(struct typec_altmode *alt) +{ + sysfs_remove_group(&alt->dev.kobj, &dp_altmode_group); +} + +static const struct typec_device_id dp_typec_id[] = { + { USB_TYPEC_DP_SID, USB_TYPEC_DP_MODE }, + { }, +}; +MODULE_DEVICE_TABLE(typec, dp_typec_id); + +static struct typec_altmode_driver dp_altmode_driver = { + .id_table = dp_typec_id, + .probe = dp_altmode_probe, + .remove = dp_altmode_remove, + .driver = { + .name = "typec_displayport", + .owner = THIS_MODULE, + }, +}; +module_typec_altmode_driver(dp_altmode_driver); + +MODULE_AUTHOR("Heikki Krogerus "); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("DisplayPort Alternate Mode"); diff --git a/include/linux/usb/typec_dp.h b/include/linux/usb/typec_dp.h new file mode 100644 index 000000000000..5ca989076d7c --- /dev/null +++ b/include/linux/usb/typec_dp.h @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __USB_TYPEC_DP_H +#define __USB_TYPEC_DP_H + +#include + +#define USB_TYPEC_DP_SID 0xff01 +#define USB_TYPEC_DP_MODE 1 + +/* + * Connector states matching the pin assignments in DisplayPort Alt Mode + * Specification. + * + * These values are meant primarily to be used by the mux drivers, but they are + * also used as the "value" part in the alternate mode notification chain, so + * receivers of those notifications will always see them. + * + * Note. DisplayPort USB Type-C Alt Mode Specification version 1.0b deprecated + * pin assignments A, B and F, but they are still defined here for legacy + * purposes. + */ +enum { + TYPEC_DP_STATE_A = TYPEC_STATE_MODAL, /* Not supported after v1.0b */ + TYPEC_DP_STATE_B, /* Not supported after v1.0b */ + TYPEC_DP_STATE_C, + TYPEC_DP_STATE_D, + TYPEC_DP_STATE_E, + TYPEC_DP_STATE_F, /* Not supported after v1.0b */ +}; + +/* + * struct typec_displayport_data - DisplayPort Alt Mode specific data + * @status: Status Update command VDO content + * @conf: Configure command VDO content + * + * This structure is delivered as the data part with the notifications. It + * contains the VDOs from the two DisplayPort Type-C alternate mode specific + * commands: Status Update and Configure. + * + * @status will show for example the status of the HPD signal. + */ +struct typec_displayport_data { + u32 status; + u32 conf; +}; + +/* DisplayPort Status Update VDO bits */ +#define DP_STATUS_CONNECTION(_status_) ((_status_) & 3) +#define DP_STATUS_CON_DISABLED 0 +#define DP_STATUS_CON_DFP_D 1 +#define DP_STATUS_CON_UFP_D 2 +#define DP_STATUS_CON_BOTH 3 +#define DP_STATUS_POWER_LOW BIT(2) +#define DP_STATUS_ENABLED BIT(3) +#define DP_STATUS_PREFER_MULTI_FUNC BIT(4) +#define DP_STATUS_SWITCH_TO_USB BIT(5) +#define DP_STATUS_EXIT_DP_MODE BIT(6) +#define DP_STATUS_HPD_STATE BIT(7) /* 0 = HPD_Low, 1 = HPD_High */ +#define DP_STATUS_IRQ_HPD BIT(8) + +/* DisplayPort Configurations VDO bits */ +#define DP_CONF_CURRENTLY(_conf_) ((_conf_) & 3) +#define DP_CONF_UFP_U_AS_DFP_D BIT(0) +#define DP_CONF_UFP_U_AS_UFP_D BIT(1) +#define DP_CONF_SIGNALING_DP BIT(2) +#define DP_CONF_SIGNALING_GEN_2 BIT(3) /* Reserved after v1.0b */ +#define DP_CONF_PIN_ASSIGNEMENT_SHIFT 8 +#define DP_CONF_PIN_ASSIGNEMENT_MASK GENMASK(15, 8) + +#endif /* __USB_TYPEC_DP_H */