From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Thunderbolt 3 Alternate Mode entry flow is described in
USB Type-C Specification Release 2.0.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---
Changes:
* Delay cable + plug checks so that the module doesn't fail to probe
if cable + plug information isn't available by the time the partner
altmode is registered.
* Remove unncessary brace after if (IS_ERR(plug))
The rest of this patch should be the same as Heikki's original RFC.
drivers/usb/typec/altmodes/Kconfig | 9 +
drivers/usb/typec/altmodes/Makefile | 2 +
drivers/usb/typec/altmodes/thunderbolt.c | 321 +++++++++++++++++++++++
3 files changed, 332 insertions(+)
create mode 100644 drivers/usb/typec/altmodes/thunderbolt.c
diff --git a/drivers/usb/typec/altmodes/Kconfig b/drivers/usb/typec/altmodes/Kconfig
index 1a6b5e872b0d..7867fa7c405d 100644
--- a/drivers/usb/typec/altmodes/Kconfig
+++ b/drivers/usb/typec/altmodes/Kconfig
@@ -23,4 +23,13 @@ config TYPEC_NVIDIA_ALTMODE
To compile this driver as a module, choose M here: the
module will be called typec_nvidia.
+config TYPEC_TBT_ALTMODE
+ tristate "Thunderbolt3 Alternate Mode driver"
+ help
+ Select this option if you have Thunderbolt3 hardware on your
+ system.
+
+ To compile this driver as a module, choose M here: the
+ module will be called typec_thunderbolt.
+
endmenu
diff --git a/drivers/usb/typec/altmodes/Makefile b/drivers/usb/typec/altmodes/Makefile
index 45717548b396..508a68351bd2 100644
--- a/drivers/usb/typec/altmodes/Makefile
+++ b/drivers/usb/typec/altmodes/Makefile
@@ -4,3 +4,5 @@ obj-$(CONFIG_TYPEC_DP_ALTMODE) += typec_displayport.o
typec_displayport-y := displayport.o
obj-$(CONFIG_TYPEC_NVIDIA_ALTMODE) += typec_nvidia.o
typec_nvidia-y := nvidia.o
+obj-$(CONFIG_TYPEC_TBT_ALTMODE) += typec_thunderbolt.o
+typec_thunderbolt-y := thunderbolt.o
diff --git a/drivers/usb/typec/altmodes/thunderbolt.c b/drivers/usb/typec/altmodes/thunderbolt.c
new file mode 100644
index 000000000000..515e775ee41a
--- /dev/null
+++ b/drivers/usb/typec/altmodes/thunderbolt.c
@@ -0,0 +1,321 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * USB Typec-C Thuderbolt3 Alternate Mode driver
+ *
+ * Copyright (C) 2019 Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/module.h>
+#include <linux/usb/pd_vdo.h>
+#include <linux/usb/typec_altmode.h>
+
+#define USB_TYPEC_VENDOR_INTEL 0x8087
+
+/* TBT3 Device Discover Mode VDO bits */
+#define TBT_MODE BIT(0)
+#define TBT_ADAPTER(_vdo_) (((_vdo_) & BIT(16)) >> 16)
+#define TBT_ADAPTER_LEGACY 0
+#define TBT_ADAPTER_TBT3 1
+#define TBT_INTEL_SPECIFIC_B0 BIT(26)
+#define TBT_VENDOR_SPECIFIC_B0 BIT(30)
+#define TBT_VENDOR_SPECIFIC_B1 BIT(31)
+
+/* TBT3 Cable Discover Mode VDO bits */
+#define TBT_CABLE_SPEED(_vdo_) (((_vdo_) & GENMASK(18, 16)) >> 16)
+#define TBT_CABLE_USB3_GEN1 1
+#define TBT_CABLE_USB3_PASSIVE 2
+#define TBT_CABLE_10_AND_20GBPS 3
+#define TBT_CABLE_ROUNDED BIT(19)
+#define TBT_CABLE_OPTICAL BIT(21)
+#define TBT_CABLE_RETIMER BIT(22)
+#define TBT_CABLE_LINK_TRAINING BIT(23)
+
+/* TBT3 Device Enter Mode VDO bits */
+#define TBT_ENTER_MODE_CABLE_SPEED(_s_) (((_s_) & GENMASK(2, 0)) << 16)
+#define TBT_ENTER_MODE_ACTIVE_CABLE BIT(24)
+
+enum tbt_state {
+ TBT_STATE_IDLE,
+ TBT_STATE_SOP_P_ENTER,
+ TBT_STATE_SOP_PP_ENTER,
+ TBT_STATE_ENTER,
+ TBT_STATE_EXIT,
+ TBT_STATE_SOP_PP_EXIT,
+ TBT_STATE_SOP_P_EXIT
+};
+
+struct tbt_altmode {
+ enum tbt_state state;
+ struct typec_cable *cable;
+ struct typec_altmode *alt;
+ struct typec_altmode *plug[2];
+
+ struct work_struct work;
+ struct mutex lock; /* device lock */
+};
+
+static bool tbt_ready(struct typec_altmode *alt);
+
+static int tbt_enter_mode(struct tbt_altmode *tbt)
+{
+ struct typec_altmode *plug = tbt->plug[TYPEC_PLUG_SOP_P];
+ u32 vdo;
+
+ vdo = tbt->alt->vdo & (TBT_VENDOR_SPECIFIC_B0 | TBT_VENDOR_SPECIFIC_B1);
+ vdo |= tbt->alt->vdo & TBT_INTEL_SPECIFIC_B0;
+ vdo |= TBT_MODE;
+
+ if (plug) {
+ if (typec_cable_is_active(tbt->cable))
+ vdo |= TBT_ENTER_MODE_ACTIVE_CABLE;
+
+ vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_SPEED(plug->vdo));
+ vdo |= plug->vdo & TBT_CABLE_ROUNDED;
+ vdo |= plug->vdo & TBT_CABLE_OPTICAL;
+ vdo |= plug->vdo & TBT_CABLE_RETIMER;
+ vdo |= plug->vdo & TBT_CABLE_LINK_TRAINING;
+ } else {
+ vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_USB3_PASSIVE);
+ }
+
+ return typec_altmode_enter(tbt->alt, &vdo);
+}
+
+static void tbt_altmode_work(struct work_struct *work)
+{
+ struct tbt_altmode *tbt = container_of(work, struct tbt_altmode, work);
+ int ret;
+
+ mutex_lock(&tbt->lock);
+
+ switch (tbt->state) {
+ case TBT_STATE_SOP_P_ENTER:
+ ret = typec_altmode_enter(tbt->plug[TYPEC_PLUG_SOP_P], NULL);
+ if (ret)
+ dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_P]->dev,
+ "failed to enter mode (%d)\n", ret);
+ break;
+ case TBT_STATE_SOP_PP_ENTER:
+ ret = typec_altmode_enter(tbt->plug[TYPEC_PLUG_SOP_PP], NULL);
+ if (ret)
+ dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_PP]->dev,
+ "failed to enter mode (%d)\n", ret);
+ break;
+ case TBT_STATE_ENTER:
+ ret = tbt_enter_mode(tbt);
+ if (ret)
+ dev_dbg(&tbt->alt->dev, "failed to enter mode (%d)\n",
+ ret);
+ break;
+ case TBT_STATE_EXIT:
+ typec_altmode_exit(tbt->alt);
+ break;
+ case TBT_STATE_SOP_PP_EXIT:
+ typec_altmode_exit(tbt->plug[TYPEC_PLUG_SOP_PP]);
+ break;
+ case TBT_STATE_SOP_P_EXIT:
+ typec_altmode_exit(tbt->plug[TYPEC_PLUG_SOP_P]);
+ break;
+ default:
+ break;
+ }
+
+ tbt->state = TBT_STATE_IDLE;
+
+ mutex_unlock(&tbt->lock);
+}
+
+static int tbt_altmode_vdm(struct typec_altmode *alt,
+ const u32 hdr, const u32 *vdo, int count)
+{
+ struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+ int cmd_type = PD_VDO_CMDT(hdr);
+ int cmd = PD_VDO_CMD(hdr);
+
+ mutex_lock(&tbt->lock);
+
+ if (tbt->state != TBT_STATE_IDLE) {
+ mutex_unlock(&tbt->lock);
+ return -EBUSY;
+ }
+
+ switch (cmd_type) {
+ case CMDT_RSP_ACK:
+ switch (cmd) {
+ case CMD_ENTER_MODE:
+ /*
+ * Following the order describeded in USB Type-C Spec
+ * R2.0 Section 6.7.3.
+ */
+ if (alt == tbt->plug[TYPEC_PLUG_SOP_P]) {
+ if (tbt->plug[TYPEC_PLUG_SOP_PP])
+ tbt->state = TBT_STATE_SOP_PP_ENTER;
+ else
+ tbt->state = TBT_STATE_ENTER;
+ } else if (alt == tbt->plug[TYPEC_PLUG_SOP_PP]) {
+ tbt->state = TBT_STATE_ENTER;
+ } else {
+ typec_altmode_notify(alt, TYPEC_STATE_MODAL,
+ NULL);
+ }
+ break;
+ case CMD_EXIT_MODE:
+ if (alt == tbt->alt) {
+ if (tbt->plug[TYPEC_PLUG_SOP_PP])
+ tbt->state = TBT_STATE_SOP_PP_EXIT;
+ else if (tbt->plug[TYPEC_PLUG_SOP_P])
+ tbt->state = TBT_STATE_SOP_P_EXIT;
+ } else if (alt == tbt->plug[TYPEC_PLUG_SOP_PP]) {
+ tbt->state = TBT_STATE_SOP_P_EXIT;
+ }
+ break;
+ }
+ break;
+ case CMDT_RSP_NAK:
+ switch (cmd) {
+ case CMD_ENTER_MODE:
+ dev_warn(&alt->dev, "Enter Mode refused\n");
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (tbt->state != TBT_STATE_IDLE)
+ schedule_work(&tbt->work);
+
+ mutex_unlock(&tbt->lock);
+
+ return 0;
+}
+
+static int tbt_altmode_activate(struct typec_altmode *alt, int activate)
+{
+ struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+ int ret;
+
+ mutex_lock(&tbt->lock);
+
+ if (!tbt_ready(alt))
+ return -ENODEV;
+
+ /* Preventing the user space from entering/exiting the cable alt mode */
+ if (alt != tbt->alt)
+ ret = -EPERM;
+ else if (activate)
+ ret = tbt_enter_mode(tbt);
+ else
+ ret = typec_altmode_exit(alt);
+
+ mutex_unlock(&tbt->lock);
+
+ return ret;
+}
+
+static const struct typec_altmode_ops tbt_altmode_ops = {
+ .vdm = tbt_altmode_vdm,
+ .activate = tbt_altmode_activate
+};
+
+static int tbt_altmode_probe(struct typec_altmode *alt)
+{
+ struct tbt_altmode *tbt;
+
+ tbt = devm_kzalloc(&alt->dev, sizeof(*tbt), GFP_KERNEL);
+ if (!tbt)
+ return -ENOMEM;
+
+ INIT_WORK(&tbt->work, tbt_altmode_work);
+ mutex_init(&tbt->lock);
+ tbt->alt = alt;
+
+ alt->desc = "Thunderbolt3";
+ typec_altmode_set_drvdata(alt, tbt);
+ typec_altmode_set_ops(alt, &tbt_altmode_ops);
+
+ if (tbt_ready(alt)) {
+ if (tbt->plug[TYPEC_PLUG_SOP_PP])
+ tbt->state = TBT_STATE_SOP_PP_ENTER;
+ else if (tbt->plug[TYPEC_PLUG_SOP_P])
+ tbt->state = TBT_STATE_SOP_P_ENTER;
+ else
+ tbt->state = TBT_STATE_ENTER;
+ schedule_work(&tbt->work);
+ }
+
+ return 0;
+}
+
+static void tbt_altmode_remove(struct typec_altmode *alt)
+{
+ struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+
+ for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
+ if (tbt->plug[i])
+ typec_altmode_put_plug(tbt->plug[i]);
+ }
+
+ if (tbt->cable)
+ typec_cable_put(tbt->cable);
+}
+
+static bool tbt_ready(struct typec_altmode *alt)
+{
+ struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
+ struct typec_altmode *plug;
+
+ if (tbt->cable)
+ return true;
+
+ /* Thundebolt 3 requires a cable with eMarker */
+ tbt->cable = typec_cable_get(typec_altmode2port(tbt->alt));
+ if (!tbt->cable)
+ return false;
+
+ /* We accept systems without SOP' or SOP''. This means the port altmode
+ * driver will be responsible for properly ordering entry/exit.
+ */
+ for (int i = 0; i < TYPEC_PLUG_SOP_PP + 1; i++) {
+ plug = typec_altmode_get_plug(tbt->alt, i);
+ if (IS_ERR(plug))
+ continue;
+
+ if (!plug || plug->svid != USB_TYPEC_VENDOR_INTEL)
+ break;
+
+ plug->desc = "Thunderbolt3";
+ plug->ops = &tbt_altmode_ops;
+ typec_altmode_set_drvdata(plug, tbt);
+
+ tbt->plug[i] = plug;
+ }
+
+ return true;
+}
+
+static const struct typec_device_id tbt_typec_id[] = {
+ { USB_TYPEC_VENDOR_INTEL, TYPEC_ANY_MODE },
+ { }
+};
+MODULE_DEVICE_TABLE(typec, tbt_typec_id);
+
+static struct typec_altmode_driver tbt_altmode_driver = {
+ .id_table = tbt_typec_id,
+ .probe = tbt_altmode_probe,
+ .remove = tbt_altmode_remove,
+ .driver = {
+ .name = "typec-thunderbolt",
+ .owner = THIS_MODULE,
+ }
+};
+module_typec_altmode_driver(tbt_altmode_driver);
+
+MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Thunderbolt3 USB Type-C Alternate Mode");
--
2.46.0.792.g87dc391469-googHi Abhishek,
kernel test robot noticed the following build warnings:
[auto build test WARNING on chrome-platform/for-next]
[also build test WARNING on chrome-platform/for-firmware-next usb/usb-testing usb/usb-next usb/usb-linus linus/master v6.11 next-20240926]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Abhishek-Pandit-Subedi/usb-typec-Add-driver-for-Thunderbolt-3-Alternate-Mode/20240926-002931
base: https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git for-next
patch link: https://lore.kernel.org/r/20240925092505.1.I3080b036e8de0b9957c57c1c3059db7149c5e549%40changeid
patch subject: [PATCH 1/8] usb: typec: Add driver for Thunderbolt 3 Alternate Mode
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20240926/202409262224.Bnlmjakc-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240926/202409262224.Bnlmjakc-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202409262224.Bnlmjakc-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/usb/typec/altmodes/thunderbolt.c:15: warning: expecting prototype for USB Typec(). Prototype was for USB_TYPEC_VENDOR_INTEL() instead
vim +15 drivers/usb/typec/altmodes/thunderbolt.c
14
> 15 #define USB_TYPEC_VENDOR_INTEL 0x8087
16
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
Hi Abhishek,
On Wed, Sep 25, 2024 at 09:25:02AM -0700, Abhishek Pandit-Subedi wrote:
> From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
>
> Thunderbolt 3 Alternate Mode entry flow is described in
> USB Type-C Specification Release 2.0.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> ---
>
> Changes:
> * Delay cable + plug checks so that the module doesn't fail to probe
> if cable + plug information isn't available by the time the partner
> altmode is registered.
> * Remove unncessary brace after if (IS_ERR(plug))
>
> The rest of this patch should be the same as Heikki's original RFC.
>
>
> drivers/usb/typec/altmodes/Kconfig | 9 +
> drivers/usb/typec/altmodes/Makefile | 2 +
> drivers/usb/typec/altmodes/thunderbolt.c | 321 +++++++++++++++++++++++
> 3 files changed, 332 insertions(+)
> create mode 100644 drivers/usb/typec/altmodes/thunderbolt.c
>
> diff --git a/drivers/usb/typec/altmodes/Kconfig b/drivers/usb/typec/altmodes/Kconfig
> index 1a6b5e872b0d..7867fa7c405d 100644
> --- a/drivers/usb/typec/altmodes/Kconfig
> +++ b/drivers/usb/typec/altmodes/Kconfig
> @@ -23,4 +23,13 @@ config TYPEC_NVIDIA_ALTMODE
> To compile this driver as a module, choose M here: the
> module will be called typec_nvidia.
>
> +config TYPEC_TBT_ALTMODE
> + tristate "Thunderbolt3 Alternate Mode driver"
> + help
> + Select this option if you have Thunderbolt3 hardware on your
> + system.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called typec_thunderbolt.
> +
> endmenu
> diff --git a/drivers/usb/typec/altmodes/Makefile b/drivers/usb/typec/altmodes/Makefile
> index 45717548b396..508a68351bd2 100644
> --- a/drivers/usb/typec/altmodes/Makefile
> +++ b/drivers/usb/typec/altmodes/Makefile
> @@ -4,3 +4,5 @@ obj-$(CONFIG_TYPEC_DP_ALTMODE) += typec_displayport.o
> typec_displayport-y := displayport.o
> obj-$(CONFIG_TYPEC_NVIDIA_ALTMODE) += typec_nvidia.o
> typec_nvidia-y := nvidia.o
> +obj-$(CONFIG_TYPEC_TBT_ALTMODE) += typec_thunderbolt.o
> +typec_thunderbolt-y := thunderbolt.o
> diff --git a/drivers/usb/typec/altmodes/thunderbolt.c b/drivers/usb/typec/altmodes/thunderbolt.c
> new file mode 100644
> index 000000000000..515e775ee41a
> --- /dev/null
> +++ b/drivers/usb/typec/altmodes/thunderbolt.c
> @@ -0,0 +1,321 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/**
> + * USB Typec-C Thuderbolt3 Alternate Mode driver
> + *
> + * Copyright (C) 2019 Intel Corporation
> + * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/mutex.h>
> +#include <linux/module.h>
> +#include <linux/usb/pd_vdo.h>
> +#include <linux/usb/typec_altmode.h>
> +
> +#define USB_TYPEC_VENDOR_INTEL 0x8087
> +
> +/* TBT3 Device Discover Mode VDO bits */
> +#define TBT_MODE BIT(0)
> +#define TBT_ADAPTER(_vdo_) (((_vdo_) & BIT(16)) >> 16)
> +#define TBT_ADAPTER_LEGACY 0
> +#define TBT_ADAPTER_TBT3 1
> +#define TBT_INTEL_SPECIFIC_B0 BIT(26)
> +#define TBT_VENDOR_SPECIFIC_B0 BIT(30)
> +#define TBT_VENDOR_SPECIFIC_B1 BIT(31)
> +
> +/* TBT3 Cable Discover Mode VDO bits */
> +#define TBT_CABLE_SPEED(_vdo_) (((_vdo_) & GENMASK(18, 16)) >> 16)
> +#define TBT_CABLE_USB3_GEN1 1
> +#define TBT_CABLE_USB3_PASSIVE 2
> +#define TBT_CABLE_10_AND_20GBPS 3
> +#define TBT_CABLE_ROUNDED BIT(19)
> +#define TBT_CABLE_OPTICAL BIT(21)
> +#define TBT_CABLE_RETIMER BIT(22)
> +#define TBT_CABLE_LINK_TRAINING BIT(23)
> +
> +/* TBT3 Device Enter Mode VDO bits */
> +#define TBT_ENTER_MODE_CABLE_SPEED(_s_) (((_s_) & GENMASK(2, 0)) << 16)
> +#define TBT_ENTER_MODE_ACTIVE_CABLE BIT(24)
I guess my original RFC was before the introduction of
linux/usb/typec_tbt.h. You can replace all the above definitions with:
#include <linux/usb/typec_tbt.h>
> +enum tbt_state {
> + TBT_STATE_IDLE,
> + TBT_STATE_SOP_P_ENTER,
> + TBT_STATE_SOP_PP_ENTER,
> + TBT_STATE_ENTER,
> + TBT_STATE_EXIT,
> + TBT_STATE_SOP_PP_EXIT,
> + TBT_STATE_SOP_P_EXIT
> +};
> +
> +struct tbt_altmode {
> + enum tbt_state state;
> + struct typec_cable *cable;
> + struct typec_altmode *alt;
> + struct typec_altmode *plug[2];
You really have to supply struct typec_thunderbolt_data from this
driver.
I understand that by leaving the mux handling to the alt mode drivers,
you have to refactor at least cros_ec_typec.c, but I really think you
have to do it. So please either add here:
struct typec_thunderbolt_data data;
or if we don't need to store it, store only the Enter Mode VDO:
u32 enter_vdo;
> + struct work_struct work;
> + struct mutex lock; /* device lock */
> +};
> +
> +static bool tbt_ready(struct typec_altmode *alt);
> +
> +static int tbt_enter_mode(struct tbt_altmode *tbt)
> +{
> + struct typec_altmode *plug = tbt->plug[TYPEC_PLUG_SOP_P];
> + u32 vdo;
> +
> + vdo = tbt->alt->vdo & (TBT_VENDOR_SPECIFIC_B0 | TBT_VENDOR_SPECIFIC_B1);
> + vdo |= tbt->alt->vdo & TBT_INTEL_SPECIFIC_B0;
> + vdo |= TBT_MODE;
> +
> + if (plug) {
> + if (typec_cable_is_active(tbt->cable))
> + vdo |= TBT_ENTER_MODE_ACTIVE_CABLE;
> +
> + vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_SPEED(plug->vdo));
> + vdo |= plug->vdo & TBT_CABLE_ROUNDED;
TBT_CABLE_ROUNDED needs to be defined in typec_tbt.h. It's missing for
some reason.
> + vdo |= plug->vdo & TBT_CABLE_OPTICAL;
> + vdo |= plug->vdo & TBT_CABLE_RETIMER;
> + vdo |= plug->vdo & TBT_CABLE_LINK_TRAINING;
> + } else {
> + vdo |= TBT_ENTER_MODE_CABLE_SPEED(TBT_CABLE_USB3_PASSIVE);
> + }
So this vdo I believe will need to be stored:
tbt->data.enter_vdo;
or
tbt->enter_vdo = vdo;
> + return typec_altmode_enter(tbt->alt, &vdo);
> +}
> +
> +static void tbt_altmode_work(struct work_struct *work)
> +{
> + struct tbt_altmode *tbt = container_of(work, struct tbt_altmode, work);
> + int ret;
> +
> + mutex_lock(&tbt->lock);
> +
> + switch (tbt->state) {
> + case TBT_STATE_SOP_P_ENTER:
> + ret = typec_altmode_enter(tbt->plug[TYPEC_PLUG_SOP_P], NULL);
> + if (ret)
> + dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_P]->dev,
> + "failed to enter mode (%d)\n", ret);
> + break;
> + case TBT_STATE_SOP_PP_ENTER:
> + ret = typec_altmode_enter(tbt->plug[TYPEC_PLUG_SOP_PP], NULL);
> + if (ret)
> + dev_dbg(&tbt->plug[TYPEC_PLUG_SOP_PP]->dev,
> + "failed to enter mode (%d)\n", ret);
> + break;
> + case TBT_STATE_ENTER:
> + ret = tbt_enter_mode(tbt);
> + if (ret)
> + dev_dbg(&tbt->alt->dev, "failed to enter mode (%d)\n",
> + ret);
> + break;
> + case TBT_STATE_EXIT:
> + typec_altmode_exit(tbt->alt);
> + break;
> + case TBT_STATE_SOP_PP_EXIT:
> + typec_altmode_exit(tbt->plug[TYPEC_PLUG_SOP_PP]);
> + break;
> + case TBT_STATE_SOP_P_EXIT:
> + typec_altmode_exit(tbt->plug[TYPEC_PLUG_SOP_P]);
> + break;
> + default:
> + break;
> + }
> +
> + tbt->state = TBT_STATE_IDLE;
> +
> + mutex_unlock(&tbt->lock);
> +}
> +
> +static int tbt_altmode_vdm(struct typec_altmode *alt,
> + const u32 hdr, const u32 *vdo, int count)
> +{
> + struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> + int cmd_type = PD_VDO_CMDT(hdr);
> + int cmd = PD_VDO_CMD(hdr);
> +
> + mutex_lock(&tbt->lock);
> +
> + if (tbt->state != TBT_STATE_IDLE) {
> + mutex_unlock(&tbt->lock);
> + return -EBUSY;
> + }
> +
> + switch (cmd_type) {
> + case CMDT_RSP_ACK:
> + switch (cmd) {
> + case CMD_ENTER_MODE:
> + /*
> + * Following the order describeded in USB Type-C Spec
> + * R2.0 Section 6.7.3.
> + */
> + if (alt == tbt->plug[TYPEC_PLUG_SOP_P]) {
> + if (tbt->plug[TYPEC_PLUG_SOP_PP])
> + tbt->state = TBT_STATE_SOP_PP_ENTER;
> + else
> + tbt->state = TBT_STATE_ENTER;
> + } else if (alt == tbt->plug[TYPEC_PLUG_SOP_PP]) {
> + tbt->state = TBT_STATE_ENTER;
> + } else {
> + typec_altmode_notify(alt, TYPEC_STATE_MODAL,
> + NULL);
typec_altmode_notify(alt, TYPEC_STATE_MODAL, &tbt->data);
or, if this is possible:
struct typec_thunderbolt_data;
data.device_vdo = tbt->alt->vdo;
data.cable_vdo = tbt->plug[TYPEC_PLUG_SOP_P].vdo;
data.enter_vdo = tbt->enter_vdo;
typec_altmode_notify(alt, TYPEC_STATE_MODAL, &data);
> + }
> + break;
> + case CMD_EXIT_MODE:
> + if (alt == tbt->alt) {
> + if (tbt->plug[TYPEC_PLUG_SOP_PP])
> + tbt->state = TBT_STATE_SOP_PP_EXIT;
> + else if (tbt->plug[TYPEC_PLUG_SOP_P])
> + tbt->state = TBT_STATE_SOP_P_EXIT;
> + } else if (alt == tbt->plug[TYPEC_PLUG_SOP_PP]) {
> + tbt->state = TBT_STATE_SOP_P_EXIT;
> + }
> + break;
> + }
> + break;
> + case CMDT_RSP_NAK:
> + switch (cmd) {
> + case CMD_ENTER_MODE:
> + dev_warn(&alt->dev, "Enter Mode refused\n");
> + break;
> + default:
> + break;
> + }
> + break;
> + default:
> + break;
> + }
> +
> + if (tbt->state != TBT_STATE_IDLE)
> + schedule_work(&tbt->work);
> +
> + mutex_unlock(&tbt->lock);
> +
> + return 0;
> +}
> +
> +static int tbt_altmode_activate(struct typec_altmode *alt, int activate)
> +{
> + struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> + int ret;
> +
> + mutex_lock(&tbt->lock);
> +
> + if (!tbt_ready(alt))
> + return -ENODEV;
> +
> + /* Preventing the user space from entering/exiting the cable alt mode */
> + if (alt != tbt->alt)
> + ret = -EPERM;
> + else if (activate)
> + ret = tbt_enter_mode(tbt);
> + else
> + ret = typec_altmode_exit(alt);
> +
> + mutex_unlock(&tbt->lock);
> +
> + return ret;
> +}
> +
> +static const struct typec_altmode_ops tbt_altmode_ops = {
> + .vdm = tbt_altmode_vdm,
> + .activate = tbt_altmode_activate
> +};
> +
> +static int tbt_altmode_probe(struct typec_altmode *alt)
> +{
> + struct tbt_altmode *tbt;
> +
> + tbt = devm_kzalloc(&alt->dev, sizeof(*tbt), GFP_KERNEL);
> + if (!tbt)
> + return -ENOMEM;
> +
> + INIT_WORK(&tbt->work, tbt_altmode_work);
> + mutex_init(&tbt->lock);
> + tbt->alt = alt;
tbt->data.device_mode = alt->vdo;
> + alt->desc = "Thunderbolt3";
> + typec_altmode_set_drvdata(alt, tbt);
> + typec_altmode_set_ops(alt, &tbt_altmode_ops);
> +
> + if (tbt_ready(alt)) {
> + if (tbt->plug[TYPEC_PLUG_SOP_PP])
> + tbt->state = TBT_STATE_SOP_PP_ENTER;
> + else if (tbt->plug[TYPEC_PLUG_SOP_P])
> + tbt->state = TBT_STATE_SOP_P_ENTER;
> + else
> + tbt->state = TBT_STATE_ENTER;
> + schedule_work(&tbt->work);
> + }
> +
> + return 0;
> +}
> +
> +static void tbt_altmode_remove(struct typec_altmode *alt)
> +{
> + struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> +
> + for (int i = TYPEC_PLUG_SOP_PP; i > 0; --i) {
> + if (tbt->plug[i])
> + typec_altmode_put_plug(tbt->plug[i]);
> + }
> +
> + if (tbt->cable)
> + typec_cable_put(tbt->cable);
> +}
> +
> +static bool tbt_ready(struct typec_altmode *alt)
> +{
> + struct tbt_altmode *tbt = typec_altmode_get_drvdata(alt);
> + struct typec_altmode *plug;
> +
> + if (tbt->cable)
> + return true;
> +
> + /* Thundebolt 3 requires a cable with eMarker */
> + tbt->cable = typec_cable_get(typec_altmode2port(tbt->alt));
> + if (!tbt->cable)
> + return false;
> +
> + /* We accept systems without SOP' or SOP''. This means the port altmode
> + * driver will be responsible for properly ordering entry/exit.
> + */
> + for (int i = 0; i < TYPEC_PLUG_SOP_PP + 1; i++) {
> + plug = typec_altmode_get_plug(tbt->alt, i);
> + if (IS_ERR(plug))
> + continue;
> +
> + if (!plug || plug->svid != USB_TYPEC_VENDOR_INTEL)
> + break;
> +
> + plug->desc = "Thunderbolt3";
> + plug->ops = &tbt_altmode_ops;
> + typec_altmode_set_drvdata(plug, tbt);
> +
> + tbt->plug[i] = plug;
> + }
tbt->data.cable_mode = tbt->plug[TYPEC_PLUG_SOP_P].vdo;
> + return true;
> +}
> +
> +static const struct typec_device_id tbt_typec_id[] = {
> + { USB_TYPEC_VENDOR_INTEL, TYPEC_ANY_MODE },
There is also the alias: USB_TYPEC_TBT_SID
> + { }
> +};
> +MODULE_DEVICE_TABLE(typec, tbt_typec_id);
> +
> +static struct typec_altmode_driver tbt_altmode_driver = {
> + .id_table = tbt_typec_id,
> + .probe = tbt_altmode_probe,
> + .remove = tbt_altmode_remove,
> + .driver = {
> + .name = "typec-thunderbolt",
> + .owner = THIS_MODULE,
> + }
> +};
> +module_typec_altmode_driver(tbt_altmode_driver);
> +
> +MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Thunderbolt3 USB Type-C Alternate Mode");
thanks,
--
heikki
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