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authorHeikki Krogerus <heikki.krogerus@linux.intel.com>2018-06-27 18:19:51 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-02 18:42:36 +0300
commit0e3bb7d6894d9b6e67d6382bb03a46a1dc989588 (patch)
tree89159e08a940b59d6b475b06577d64df0b78f1ee /include/linux/usb
parent8a37d87d72f0c69f837229c04d2fcd7117ea57e7 (diff)
downloadlinux-0e3bb7d6894d9b6e67d6382bb03a46a1dc989588.tar.xz
usb: typec: Add driver for DisplayPort alternate mode
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 <heikki.krogerus@linux.intel.com> Tested-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/typec_dp.h95
1 files changed, 95 insertions, 0 deletions
diff --git a/include/linux/usb/typec_dp.h b/include/linux/usb/typec_dp.h
new file mode 100644
index 000000000000..55ae781d60a9
--- /dev/null
+++ b/include/linux/usb/typec_dp.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __USB_TYPEC_DP_H
+#define __USB_TYPEC_DP_H
+
+#include <linux/usb/typec_altmode.h>
+
+#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;
+};
+
+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 */
+};
+
+/* DisplayPort alt mode specific commands */
+#define DP_CMD_STATUS_UPDATE VDO_CMD_VENDOR(0)
+#define DP_CMD_CONFIGURE VDO_CMD_VENDOR(1)
+
+/* DisplayPort Capabilities VDO bits (returned with Discover Modes) */
+#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)
+
+/* 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 */