From d266e96820cc3654ba1338c55e5731fc67030d8e Mon Sep 17 00:00:00 2001 From: Ajay Gupta Date: Tue, 23 Apr 2019 17:21:50 +0300 Subject: [PATCH] usb: typec: displayport: Export probe and remove functions VirtualLink standard extends the DisplayPort Alt Mode by utilizing also the USB 2 pins on the USB Type-C connector. It uses the same messages as DisplayPort, but not the DP SVID. At the time of writing, USB IF has not assigned a Standard ID (SID) for VirtualLink, so the manufacturers of VirtualLink adapters use their Vendor IDs as the SVID. Since the SVID specific communication is exactly the same as with DisplayPort alternate mode, there is no need to implement separate driver for VirtualLink. We'll handle the current VirtualLink adapters with probe drivers, and once there is SVID assigned for it, we add it to the displayport alt mode driver. To support probing drivers, exporting the probe and remove functions, and also changing the DP_HEADER helper macro to use the SVID of the alternate mode device instead of the DisplayPort alt mode SVID. Suggested-by: Heikki Krogerus Signed-off-by: Ajay Gupta Signed-off-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/altmodes/displayport.c | 12 +++++++----- drivers/usb/typec/altmodes/displayport.h | 8 ++++++++ 2 files changed, 15 insertions(+), 5 deletions(-) create mode 100644 drivers/usb/typec/altmodes/displayport.h diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c index 1b2afeb1eeb6..4092248a5936 100644 --- a/drivers/usb/typec/altmodes/displayport.c +++ b/drivers/usb/typec/altmodes/displayport.c @@ -14,7 +14,7 @@ #include #include -#define DP_HEADER(cmd) (VDO(USB_TYPEC_DP_SID, 1, cmd) | \ +#define DP_HEADER(_dp, cmd) (VDO((_dp)->alt->svid, 1, cmd) | \ VDO_OPOS(USB_TYPEC_DP_MODE)) enum { @@ -155,7 +155,7 @@ static int dp_altmode_configured(struct dp_altmode *dp) static int dp_altmode_configure_vdm(struct dp_altmode *dp, u32 conf) { - u32 header = DP_HEADER(DP_CMD_CONFIGURE); + u32 header = DP_HEADER(dp, DP_CMD_CONFIGURE); int ret; ret = typec_altmode_notify(dp->alt, TYPEC_STATE_SAFE, &dp->data); @@ -193,7 +193,7 @@ static void dp_altmode_work(struct work_struct *work) dev_err(&dp->alt->dev, "failed to enter mode\n"); break; case DP_STATE_UPDATE: - header = DP_HEADER(DP_CMD_STATUS_UPDATE); + header = DP_HEADER(dp, DP_CMD_STATUS_UPDATE); vdo = 1; ret = typec_altmode_vdm(dp->alt, header, &vdo, 2); if (ret) @@ -507,7 +507,7 @@ static const struct attribute_group dp_altmode_group = { .attrs = dp_altmode_attrs, }; -static int dp_altmode_probe(struct typec_altmode *alt) +int dp_altmode_probe(struct typec_altmode *alt) { const struct typec_altmode *port = typec_altmode_get_partner(alt); struct dp_altmode *dp; @@ -545,14 +545,16 @@ static int dp_altmode_probe(struct typec_altmode *alt) return 0; } +EXPORT_SYMBOL_GPL(dp_altmode_probe); -static void dp_altmode_remove(struct typec_altmode *alt) +void dp_altmode_remove(struct typec_altmode *alt) { struct dp_altmode *dp = typec_altmode_get_drvdata(alt); sysfs_remove_group(&alt->dev.kobj, &dp_altmode_group); cancel_work_sync(&dp->work); } +EXPORT_SYMBOL_GPL(dp_altmode_remove); static const struct typec_device_id dp_typec_id[] = { { USB_TYPEC_DP_SID, USB_TYPEC_DP_MODE }, diff --git a/drivers/usb/typec/altmodes/displayport.h b/drivers/usb/typec/altmodes/displayport.h new file mode 100644 index 000000000000..e120364da9fd --- /dev/null +++ b/drivers/usb/typec/altmodes/displayport.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#if IS_ENABLED(CONFIG_TYPEC_DP_ALTMODE) +int dp_altmode_probe(struct typec_altmode *alt); +void dp_altmode_remove(struct typec_altmode *alt); +#else +int dp_altmode_probe(struct typec_altmode *alt) { return -ENOTSUPP; } +void dp_altmode_remove(struct typec_altmode *alt) { } +#endif /* CONFIG_TYPEC_DP_ALTMODE */ -- 2.30.2