This series introduces a retimer class to the USB Type-C framework,
It also introduces a Chrome EC (Embedded Controller) switch driver which
registers the aforementioned retimer switches as well as mode-switches.
Patch 1 and 2 introduce the retimer class and associated functions to
the Type-C common code.
Patches 3-7 add the cros-typec-switch driver.
Patches 8-9 update cros-ec-typec to get and use retimer switch handles.
Submission suggestion (as always, open to better suggestions):
- Patch 1 and 2 can go through the USB repo.
- Patch 3-9 can go through the chrome-platform repo. Since they depend
on patches 1 and 2, we can create an "topic branch" off of usb-next
once Patch 1 and 2 are submitted, and then apply Patches 3-9 on top
of that "topic branch" before merging it back into chrome-platform's
for-next branch
v2: https://lore.kernel.org/linux-usb/[email protected]/
Changes since v2:
- Fixed missing "static" declarations, and removed newlines from
function signatures.
Changes since v1:
- Changed class name and retimer device type name, and fixed
retimer reference release issue.
Prashant Malani (9):
usb: typec: Add support for retimers
usb: typec: Add retimer handle to port
platform/chrome: Add Type-C mux set command definitions
platform/chrome: cros_typec_switch: Add switch driver
platform/chrome: cros_typec_switch: Set EC retimer
platform/chrome: cros_typec_switch: Add event check
platform/chrome: cros_typec_switch: Register mode switches
platform/chrome: cros_ec_typec: Cleanup switch handle return paths
platform/chrome: cros_ec_typec: Get retimer handle
MAINTAINERS | 1 +
drivers/platform/chrome/Kconfig | 11 +
drivers/platform/chrome/Makefile | 1 +
drivers/platform/chrome/cros_ec_typec.c | 50 ++-
drivers/platform/chrome/cros_typec_switch.c | 332 ++++++++++++++++++
drivers/usb/typec/Makefile | 2 +-
drivers/usb/typec/class.c | 18 +-
drivers/usb/typec/class.h | 2 +
drivers/usb/typec/retimer.c | 168 +++++++++
drivers/usb/typec/retimer.h | 15 +
.../linux/platform_data/cros_ec_commands.h | 18 +
include/linux/usb/typec_retimer.h | 45 +++
12 files changed, 654 insertions(+), 9 deletions(-)
create mode 100644 drivers/platform/chrome/cros_typec_switch.c
create mode 100644 drivers/usb/typec/retimer.c
create mode 100644 drivers/usb/typec/retimer.h
create mode 100644 include/linux/usb/typec_retimer.h
--
2.37.0.rc0.161.g10f37bed90-goog
Invoke Chrome EC host commands to set EC-controlled retimer switches to
the state the Type-C framework instructs.
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- No changes.
Changes since v1:
- No changes.
drivers/platform/chrome/cros_typec_switch.c | 56 ++++++++++++++++++++-
1 file changed, 55 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c
index 0d319e315d57..b50ecedce662 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 +31,60 @@ 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 typec_usb_mux_set params = {
+ .mux_index = index,
+ .mux_flags = state,
+ };
+
+ struct ec_params_typec_control req = {
+ .port = port_num,
+ .command = TYPEC_CONTROL_COMMAND_USB_MUX_SET,
+ .mux_params = params,
+ };
+
+ return cros_ec_command(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 Chrome 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)
--
2.37.0.rc0.161.g10f37bed90-goog
Some of the return paths for the cros_typec_get_switch_handles()
aren't necessary. Clean up the return paths to only undo the handle
get's which succeeded.
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- No changes.
Changes since v1:
- No changes.
drivers/platform/chrome/cros_ec_typec.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 7cb2e35c4ded..39e6fd4491a9 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -157,12 +157,10 @@ static int cros_typec_get_switch_handles(struct cros_typec_port *port,
return 0;
role_sw_err:
- usb_role_switch_put(port->role_sw);
-ori_sw_err:
typec_switch_put(port->ori_sw);
-mux_err:
+ori_sw_err:
typec_mux_put(port->mux);
-
+mux_err:
return -ENODEV;
}
--
2.37.0.rc0.161.g10f37bed90-goog
The Chrome EC updates Type-C status events when mux set requests from
the Application Processor (AP) are completed. Add a check to the
flow of configuring muxes to look for this status done bit, so that
the driver is aware that the mux set completed successfully or not.
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- Fixed missing "static" identifier.
Changes since v1:
- No changes.
drivers/platform/chrome/cros_typec_switch.c | 72 ++++++++++++++++++++-
1 file changed, 70 insertions(+), 2 deletions(-)
diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c
index b50ecedce662..7c01957a032d 100644
--- a/drivers/platform/chrome/cros_typec_switch.c
+++ b/drivers/platform/chrome/cros_typec_switch.c
@@ -7,6 +7,8 @@
*/
#include <linux/acpi.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
@@ -63,6 +65,40 @@ static int cros_typec_get_mux_state(unsigned long mode, struct typec_altmode *al
return ret;
}
+static int cros_typec_send_clear_event(struct cros_typec_switch_data *sdata, int port_num,
+ u32 events_mask)
+{
+ struct ec_params_typec_control req = {
+ .port = port_num,
+ .command = TYPEC_CONTROL_COMMAND_CLEAR_EVENTS,
+ .clear_events_mask = events_mask,
+ };
+
+ return cros_ec_command(sdata->ec, 0, EC_CMD_TYPEC_CONTROL, &req,
+ sizeof(req), NULL, 0);
+}
+
+static bool cros_typec_check_event(struct cros_typec_switch_data *sdata, int port_num, u32 mask)
+{
+ struct ec_response_typec_status resp;
+ struct ec_params_typec_status req = {
+ .port = port_num,
+ };
+ int ret;
+
+ ret = cros_ec_command(sdata->ec, 0, EC_CMD_TYPEC_STATUS, &req, sizeof(req),
+ &resp, sizeof(resp));
+ if (ret < 0) {
+ dev_warn(sdata->dev, "EC_CMD_TYPEC_STATUS failed for port: %d\n", port_num);
+ return false;
+ }
+
+ if (resp.events & mask)
+ return true;
+
+ return false;
+}
+
/*
* The Chrome 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
@@ -71,12 +107,44 @@ static int cros_typec_get_mux_state(unsigned long mode, struct typec_altmode *al
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);
+ unsigned long end;
+ u32 event_mask;
+ u8 mux_state;
+ int ret;
+
+ ret = cros_typec_get_mux_state(mode, alt);
+ if (ret < 0)
+ return ret;
+ mux_state = (u8)ret;
+ /* Clear any old mux set done event. */
+ if (index == 0)
+ event_mask = PD_STATUS_EVENT_MUX_0_SET_DONE;
+ else
+ event_mask = PD_STATUS_EVENT_MUX_1_SET_DONE;
+
+ ret = cros_typec_send_clear_event(sdata, port_num, event_mask);
+ if (ret < 0)
+ return ret;
+
+ /* Send the set command. */
+ ret = cros_typec_cmd_mux_set(sdata, port_num, index, mux_state);
if (ret < 0)
return ret;
- return cros_typec_cmd_mux_set(sdata, port_num, index, (u8)ret);
+ /* Check for the mux set done event. */
+ end = jiffies + msecs_to_jiffies(1000);
+ do {
+ if (cros_typec_check_event(sdata, port_num, event_mask))
+ return 0;
+
+ usleep_range(500, 1000);
+ } while (time_before(jiffies, end));
+
+ dev_err(sdata->dev, "Timed out waiting for mux set done on index: %d, state: %d\n",
+ index, mux_state);
+
+ return -ETIMEDOUT;
}
static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
--
2.37.0.rc0.161.g10f37bed90-goog
Introduce a retimer device class and associated functions that register
and use retimer "switch" devices. These operate in a manner similar to
the "mode-switch" and help configure retimers that exist between the
Type-C connector and host controller(s).
Type C ports can be linked to retimers using firmware node device
references (again, in a manner similar to "mode-switch").
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- No changes.
Changes since v1:
- Change class name to "retimer"
- Change device type to "typec_retimer".
drivers/usb/typec/Makefile | 2 +-
drivers/usb/typec/class.c | 9 +-
drivers/usb/typec/class.h | 1 +
drivers/usb/typec/retimer.c | 168 ++++++++++++++++++++++++++++++
drivers/usb/typec/retimer.h | 15 +++
include/linux/usb/typec_retimer.h | 45 ++++++++
6 files changed, 238 insertions(+), 2 deletions(-)
create mode 100644 drivers/usb/typec/retimer.c
create mode 100644 drivers/usb/typec/retimer.h
create mode 100644 include/linux/usb/typec_retimer.h
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
index 2f174cd3e5df..4955d9af0811 100644
--- a/drivers/usb/typec/Makefile
+++ b/drivers/usb/typec/Makefile
@@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_TYPEC) += typec.o
-typec-y := class.o mux.o bus.o pd.o
+typec-y := class.o mux.o bus.o pd.o retimer.o
typec-$(CONFIG_ACPI) += port-mapper.o
obj-$(CONFIG_TYPEC) += altmodes/
obj-$(CONFIG_TYPEC_TCPM) += tcpm/
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index bbc46b14f99a..9062836bb638 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -2299,10 +2299,14 @@ static int __init typec_init(void)
if (ret)
goto err_unregister_bus;
- ret = class_register(&typec_class);
+ ret = class_register(&retimer_class);
if (ret)
goto err_unregister_mux_class;
+ ret = class_register(&typec_class);
+ if (ret)
+ goto err_unregister_retimer_class;
+
ret = usb_power_delivery_init();
if (ret)
goto err_unregister_class;
@@ -2312,6 +2316,9 @@ static int __init typec_init(void)
err_unregister_class:
class_unregister(&typec_class);
+err_unregister_retimer_class:
+ class_unregister(&retimer_class);
+
err_unregister_mux_class:
class_unregister(&typec_mux_class);
diff --git a/drivers/usb/typec/class.h b/drivers/usb/typec/class.h
index b531f9853bc0..43fcf9e37a8c 100644
--- a/drivers/usb/typec/class.h
+++ b/drivers/usb/typec/class.h
@@ -76,6 +76,7 @@ extern const struct device_type typec_port_dev_type;
#define is_typec_port(dev) ((dev)->type == &typec_port_dev_type)
extern struct class typec_mux_class;
+extern struct class retimer_class;
extern struct class typec_class;
#if defined(CONFIG_ACPI)
diff --git a/drivers/usb/typec/retimer.c b/drivers/usb/typec/retimer.c
new file mode 100644
index 000000000000..051eaa7d2899
--- /dev/null
+++ b/drivers/usb/typec/retimer.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2022 Google LLC
+ *
+ * USB Type-C Retimer support.
+ * Author: Prashant Malani <[email protected]>
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/property.h>
+#include <linux/slab.h>
+
+#include "class.h"
+#include "retimer.h"
+
+static bool dev_name_ends_with(struct device *dev, const char *suffix)
+{
+ const char *name = dev_name(dev);
+ const int name_len = strlen(name);
+ const int suffix_len = strlen(suffix);
+
+ if (suffix_len > name_len)
+ return false;
+
+ return strcmp(name + (name_len - suffix_len), suffix) == 0;
+}
+
+static int retimer_fwnode_match(struct device *dev, const void *fwnode)
+{
+ return dev_fwnode(dev) == fwnode && dev_name_ends_with(dev, "-retimer");
+}
+
+static void *typec_retimer_match(struct fwnode_handle *fwnode, const char *id, void *data)
+{
+ struct device *dev = class_find_device(&retimer_class, NULL, fwnode,
+ retimer_fwnode_match);
+
+ return dev ? to_typec_retimer(dev) : ERR_PTR(-EPROBE_DEFER);
+}
+
+/**
+ * fwnode_typec_retimer_get - Find USB Type-C retimer.
+ * @fwnode: The caller device node.
+ *
+ * Finds a retimer linked to the caller. This function is primarily meant for the
+ * Type-C drivers. Returns a reference to the retimer on success, NULL if no
+ * matching connection was found, or ERR_PTR(-EPROBE_DEFER) when a connection
+ * was found but the retimer has not been enumerated yet.
+ */
+struct typec_retimer *fwnode_typec_retimer_get(struct fwnode_handle *fwnode)
+{
+ struct typec_retimer *retimer;
+
+ retimer = fwnode_connection_find_match(fwnode, "retimer-switch", NULL, typec_retimer_match);
+ if (!IS_ERR_OR_NULL(retimer))
+ WARN_ON(!try_module_get(retimer->dev.parent->driver->owner));
+
+ return retimer;
+}
+EXPORT_SYMBOL_GPL(fwnode_typec_retimer_get);
+
+/**
+ * typec_retimer_put - Release handle to a retimer.
+ * @retimer: USB Type-C Connector Retimer.
+ *
+ * Decrements reference count for @retimer.
+ */
+void typec_retimer_put(struct typec_retimer *retimer)
+{
+ if (!IS_ERR_OR_NULL(retimer)) {
+ module_put(retimer->dev.parent->driver->owner);
+ put_device(&retimer->dev);
+ }
+}
+EXPORT_SYMBOL_GPL(typec_retimer_put);
+
+int typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
+{
+ if (IS_ERR_OR_NULL(retimer))
+ return 0;
+
+ return retimer->set(retimer, state);
+}
+EXPORT_SYMBOL_GPL(typec_retimer_set);
+
+static void typec_retimer_release(struct device *dev)
+{
+ kfree(to_typec_retimer(dev));
+}
+
+static const struct device_type typec_retimer_dev_type = {
+ .name = "typec_retimer",
+ .release = typec_retimer_release,
+};
+
+/**
+ * typec_retimer_register - Register a retimer device.
+ * @parent: Parent device.
+ * @desc: Retimer description.
+ *
+ * Some USB Type-C connectors have their physical lines routed through retimers before they
+ * reach muxes or host controllers. In some cases (for example: using alternate modes)
+ * these retimers need to be reconfigured appropriately. This function registers retimer
+ * switches which route and potentially modify the signals on the Type C physical lines
+ * enroute to the host controllers.
+ */
+struct typec_retimer *
+typec_retimer_register(struct device *parent, const struct typec_retimer_desc *desc)
+{
+ struct typec_retimer *retimer;
+ int ret;
+
+ if (!desc || !desc->set)
+ return ERR_PTR(-EINVAL);
+
+ retimer = kzalloc(sizeof(*retimer), GFP_KERNEL);
+ if (!retimer)
+ return ERR_PTR(-ENOMEM);
+
+ retimer->set = desc->set;
+
+ device_initialize(&retimer->dev);
+ retimer->dev.parent = parent;
+ retimer->dev.fwnode = desc->fwnode;
+ retimer->dev.class = &retimer_class;
+ retimer->dev.type = &typec_retimer_dev_type;
+ retimer->dev.driver_data = desc->drvdata;
+ dev_set_name(&retimer->dev, "%s-retimer",
+ desc->name ? desc->name : dev_name(parent));
+
+ ret = device_add(&retimer->dev);
+ if (ret) {
+ dev_err(parent, "failed to register retimer (%d)\n", ret);
+ put_device(&retimer->dev);
+ return ERR_PTR(ret);
+ }
+
+ return retimer;
+}
+EXPORT_SYMBOL_GPL(typec_retimer_register);
+
+/**
+ * typec_retimer_unregister - Unregister retimer device.
+ * @retimer: USB Type-C Connector retimer.
+ *
+ * Unregister retimer that was registered with typec_retimer_register().
+ */
+void typec_retimer_unregister(struct typec_retimer *retimer)
+{
+ if (!IS_ERR_OR_NULL(retimer))
+ device_unregister(&retimer->dev);
+}
+EXPORT_SYMBOL_GPL(typec_retimer_unregister);
+
+void *typec_retimer_get_drvdata(struct typec_retimer *retimer)
+{
+ return dev_get_drvdata(&retimer->dev);
+}
+EXPORT_SYMBOL_GPL(typec_retimer_get_drvdata);
+
+struct class retimer_class = {
+ .name = "retimer",
+ .owner = THIS_MODULE,
+};
diff --git a/drivers/usb/typec/retimer.h b/drivers/usb/typec/retimer.h
new file mode 100644
index 000000000000..fa15951d4846
--- /dev/null
+++ b/drivers/usb/typec/retimer.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __USB_TYPEC_RETIMER__
+#define __USB_TYPEC_RETIMER__
+
+#include <linux/usb/typec_retimer.h>
+
+struct typec_retimer {
+ struct device dev;
+ typec_retimer_set_fn_t set;
+};
+
+#define to_typec_retimer(_dev_) container_of(_dev_, struct typec_retimer, dev)
+
+#endif /* __USB_TYPEC_RETIMER__ */
diff --git a/include/linux/usb/typec_retimer.h b/include/linux/usb/typec_retimer.h
new file mode 100644
index 000000000000..5e036b3360e2
--- /dev/null
+++ b/include/linux/usb/typec_retimer.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __USB_TYPEC_RETIMER
+#define __USB_TYPEC_RETIMER
+
+#include <linux/property.h>
+#include <linux/usb/typec.h>
+
+struct device;
+struct typec_retimer;
+struct typec_altmode;
+struct fwnode_handle;
+
+struct typec_retimer_state {
+ struct typec_altmode *alt;
+ unsigned long mode;
+ void *data;
+};
+
+typedef int (*typec_retimer_set_fn_t)(struct typec_retimer *retimer,
+ struct typec_retimer_state *state);
+
+struct typec_retimer_desc {
+ struct fwnode_handle *fwnode;
+ typec_retimer_set_fn_t set;
+ const char *name;
+ void *drvdata;
+};
+
+struct typec_retimer *fwnode_typec_retimer_get(struct fwnode_handle *fwnode);
+void typec_retimer_put(struct typec_retimer *retimer);
+int typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state);
+
+static inline struct typec_retimer *typec_retimer_get(struct device *dev)
+{
+ return fwnode_typec_retimer_get(dev_fwnode(dev));
+}
+
+struct typec_retimer *
+typec_retimer_register(struct device *parent, const struct typec_retimer_desc *desc);
+void typec_retimer_unregister(struct typec_retimer *retimer);
+
+void *typec_retimer_get_drvdata(struct typec_retimer *retimer);
+
+#endif /* __USB_TYPEC_RETIMER */
--
2.37.0.rc0.161.g10f37bed90-goog
Similar to mux and orientation switch, add a handle for registered
retimer to the port, so that it has handles to the various switches
connected to it.
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- No changes.
Changes since v1:
- Relinquish retimer reference during typec_release.
drivers/usb/typec/class.c | 9 +++++++++
drivers/usb/typec/class.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 9062836bb638..f08e32d552b4 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -12,6 +12,7 @@
#include <linux/slab.h>
#include <linux/usb/pd_vdo.h>
#include <linux/usb/typec_mux.h>
+#include <linux/usb/typec_retimer.h>
#include "bus.h"
#include "class.h"
@@ -1736,6 +1737,7 @@ static void typec_release(struct device *dev)
ida_destroy(&port->mode_ids);
typec_switch_put(port->sw);
typec_mux_put(port->mux);
+ typec_retimer_put(port->retimer);
kfree(port->cap);
kfree(port);
}
@@ -2249,6 +2251,13 @@ struct typec_port *typec_register_port(struct device *parent,
return ERR_PTR(ret);
}
+ port->retimer = typec_retimer_get(&port->dev);
+ if (IS_ERR(port->retimer)) {
+ ret = PTR_ERR(port->retimer);
+ put_device(&port->dev);
+ return ERR_PTR(ret);
+ }
+
ret = device_add(&port->dev);
if (ret) {
dev_err(parent, "failed to register port (%d)\n", ret);
diff --git a/drivers/usb/typec/class.h b/drivers/usb/typec/class.h
index 43fcf9e37a8c..673b2952b074 100644
--- a/drivers/usb/typec/class.h
+++ b/drivers/usb/typec/class.h
@@ -55,6 +55,7 @@ struct typec_port {
enum typec_orientation orientation;
struct typec_switch *sw;
struct typec_mux *mux;
+ struct typec_retimer *retimer;
const struct typec_capability *cap;
const struct typec_operations *ops;
--
2.37.0.rc0.161.g10f37bed90-goog
Copy EC header definitions for the USB Type-C Mux control command from
the EC code base. Also pull in "TBT_UFP_REPLY" definitions, since that
is the prior entry in the enum.
These headers are already present in the EC code base. [1]
[1] https://chromium.googlesource.com/chromiumos/platform/ec/+/b80f85a94a423273c1638ef7b662c56931a138dd/include/ec_commands.h
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- No changes.
Changes since v1:
- No changes.
include/linux/platform_data/cros_ec_commands.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
index 8cfa8cfca77e..a3945c5e7f50 100644
--- a/include/linux/platform_data/cros_ec_commands.h
+++ b/include/linux/platform_data/cros_ec_commands.h
@@ -5722,8 +5722,21 @@ enum typec_control_command {
TYPEC_CONTROL_COMMAND_EXIT_MODES,
TYPEC_CONTROL_COMMAND_CLEAR_EVENTS,
TYPEC_CONTROL_COMMAND_ENTER_MODE,
+ TYPEC_CONTROL_COMMAND_TBT_UFP_REPLY,
+ TYPEC_CONTROL_COMMAND_USB_MUX_SET,
};
+/* Replies the AP may specify to the TBT EnterMode command as a UFP */
+enum typec_tbt_ufp_reply {
+ TYPEC_TBT_UFP_REPLY_NAK,
+ TYPEC_TBT_UFP_REPLY_ACK,
+};
+
+struct typec_usb_mux_set {
+ uint8_t mux_index; /* Index of the mux to set in the chain */
+ uint8_t mux_flags; /* USB_PD_MUX_*-encoded USB mux state to set */
+} __ec_align1;
+
struct ec_params_typec_control {
uint8_t port;
uint8_t command; /* enum typec_control_command */
@@ -5737,6 +5750,8 @@ struct ec_params_typec_control {
union {
uint32_t clear_events_mask;
uint8_t mode_to_enter; /* enum typec_mode */
+ uint8_t tbt_ufp_reply; /* enum typec_tbt_ufp_reply */
+ struct typec_usb_mux_set mux_params;
uint8_t placeholder[128];
};
} __ec_align1;
@@ -5815,6 +5830,9 @@ enum tcpc_cc_polarity {
#define PD_STATUS_EVENT_SOP_DISC_DONE BIT(0)
#define PD_STATUS_EVENT_SOP_PRIME_DISC_DONE BIT(1)
#define PD_STATUS_EVENT_HARD_RESET BIT(2)
+#define PD_STATUS_EVENT_DISCONNECTED BIT(3)
+#define PD_STATUS_EVENT_MUX_0_SET_DONE BIT(4)
+#define PD_STATUS_EVENT_MUX_1_SET_DONE BIT(5)
struct ec_params_typec_status {
uint8_t port;
--
2.37.0.rc0.161.g10f37bed90-goog
Register mode switch devices for Type C connectors, when they are
specified by firmware. These control Type C configuration for any USB
Type-C mode switches (sometimes known as "muxes") which are controlled
by the Chrome EC.
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- Fixed missing "static" identifier.
Changes since v1:
- No changes.
drivers/platform/chrome/cros_typec_switch.c | 40 +++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c
index 7c01957a032d..024a2bb146b2 100644
--- a/drivers/platform/chrome/cros_typec_switch.c
+++ b/drivers/platform/chrome/cros_typec_switch.c
@@ -15,6 +15,7 @@
#include <linux/platform_device.h>
#include <linux/usb/typec_altmode.h>
#include <linux/usb/typec_dp.h>
+#include <linux/usb/typec_mux.h>
#include <linux/usb/typec_retimer.h>
#define DRV_NAME "cros-typec-switch"
@@ -22,6 +23,7 @@
/* Handles and other relevant data required for each port's switches. */
struct cros_typec_port {
int port_num;
+ struct typec_mux_dev *mode_switch;
struct typec_retimer *retimer;
struct cros_typec_switch_data *sdata;
};
@@ -147,6 +149,15 @@ static int cros_typec_configure_mux(struct cros_typec_switch_data *sdata, int po
return -ETIMEDOUT;
}
+static int cros_typec_mode_switch_set(struct typec_mux_dev *mode_switch,
+ struct typec_mux_state *state)
+{
+ struct cros_typec_port *port = typec_mux_get_drvdata(mode_switch);
+
+ /* Mode switches have index 0. */
+ return cros_typec_configure_mux(port->sdata, port->port_num, 0, state->mode, state->alt);
+}
+
static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
{
struct cros_typec_port *port = typec_retimer_get_drvdata(retimer);
@@ -163,9 +174,27 @@ static void cros_typec_unregister_switches(struct cros_typec_switch_data *sdata)
if (!sdata->ports[i])
continue;
typec_retimer_unregister(sdata->ports[i]->retimer);
+ typec_mux_unregister(sdata->ports[i]->mode_switch);
}
}
+static int cros_typec_register_mode_switch(struct cros_typec_port *port,
+ struct fwnode_handle *fwnode)
+{
+ struct typec_mux_desc mode_switch_desc = {
+ .fwnode = fwnode,
+ .drvdata = port,
+ .name = fwnode_get_name(fwnode),
+ .set = cros_typec_mode_switch_set,
+ };
+
+ port->mode_switch = typec_mux_register(port->sdata->dev, &mode_switch_desc);
+ if (IS_ERR(port->mode_switch))
+ return PTR_ERR(port->mode_switch);
+
+ return 0;
+}
+
static int cros_typec_register_retimer(struct cros_typec_port *port, struct fwnode_handle *fwnode)
{
struct typec_retimer_desc retimer_desc = {
@@ -235,6 +264,17 @@ static int cros_typec_register_switches(struct cros_typec_switch_data *sdata)
}
dev_dbg(dev, "Retimer switch registered for index %llu\n", index);
+
+ if (!fwnode_property_read_bool(fwnode, "mode-switch"))
+ continue;
+
+ ret = cros_typec_register_mode_switch(port, fwnode);
+ if (ret) {
+ dev_err(dev, "Mode switch register failed\n");
+ goto err_switch;
+ }
+
+ dev_dbg(dev, "Mode switch registered for index %llu\n", index);
}
return 0;
--
2.37.0.rc0.161.g10f37bed90-goog
Where available, obtain the handle to retimer switch specified via
firmware, and update the mux configuration callsites to add retimer
support for supported modes.
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- No changes.
Changes since v1:
- No changes.
drivers/platform/chrome/cros_ec_typec.c | 44 +++++++++++++++++++++++--
1 file changed, 41 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 39e6fd4491a9..38c4ac754ea9 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -20,6 +20,7 @@
#include <linux/usb/typec_altmode.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_mux.h>
+#include <linux/usb/typec_retimer.h>
#include <linux/usb/typec_tbt.h>
#include <linux/usb/role.h>
@@ -53,6 +54,7 @@ struct cros_typec_port {
struct usb_pd_identity c_identity;
struct typec_switch *ori_sw;
struct typec_mux *mux;
+ struct typec_retimer *retimer;
struct usb_role_switch *role_sw;
/* Variables keeping track of switch state. */
@@ -142,6 +144,12 @@ static int cros_typec_get_switch_handles(struct cros_typec_port *port,
goto mux_err;
}
+ port->retimer = fwnode_typec_retimer_get(fwnode);
+ if (IS_ERR(port->retimer)) {
+ dev_dbg(dev, "Retimer handle not found.\n");
+ goto retimer_sw_err;
+ }
+
port->ori_sw = fwnode_typec_switch_get(fwnode);
if (IS_ERR(port->ori_sw)) {
dev_dbg(dev, "Orientation switch handle not found.\n");
@@ -159,6 +167,8 @@ static int cros_typec_get_switch_handles(struct cros_typec_port *port,
role_sw_err:
typec_switch_put(port->ori_sw);
ori_sw_err:
+ typec_retimer_put(port->retimer);
+retimer_sw_err:
typec_mux_put(port->mux);
mux_err:
return -ENODEV;
@@ -203,6 +213,21 @@ static void cros_typec_unregister_altmodes(struct cros_typec_data *typec, int po
}
}
+/*
+ * Map the Type-C Mux state to retimer state and call the retimer set function. We need this
+ * because we re-use the Type-C mux state for retimers.
+ */
+static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_mux_state state)
+{
+ struct typec_retimer_state rstate = {
+ .alt = state.alt,
+ .mode = state.mode,
+ .data = state.data,
+ };
+
+ return typec_retimer_set(retimer, &rstate);
+}
+
static int cros_typec_usb_disconnect_state(struct cros_typec_port *port)
{
port->state.alt = NULL;
@@ -211,6 +236,7 @@ static int cros_typec_usb_disconnect_state(struct cros_typec_port *port)
usb_role_switch_set_role(port->role_sw, USB_ROLE_NONE);
typec_switch_set(port->ori_sw, TYPEC_ORIENTATION_NONE);
+ cros_typec_retimer_set(port->retimer, port->state);
return typec_mux_set(port->mux, &port->state);
}
@@ -381,9 +407,14 @@ static int cros_typec_init_ports(struct cros_typec_data *typec)
static int cros_typec_usb_safe_state(struct cros_typec_port *port)
{
+ int ret;
port->state.mode = TYPEC_STATE_SAFE;
- return typec_mux_set(port->mux, &port->state);
+ ret = cros_typec_retimer_set(port->retimer, port->state);
+ if (!ret)
+ ret = typec_mux_set(port->mux, &port->state);
+
+ return ret;
}
/*
@@ -480,7 +511,11 @@ static int cros_typec_enable_dp(struct cros_typec_data *typec,
port->state.data = &dp_data;
port->state.mode = TYPEC_MODAL_STATE(ffs(pd_ctrl->dp_mode));
- return typec_mux_set(port->mux, &port->state);
+ ret = cros_typec_retimer_set(port->retimer, port->state);
+ if (!ret)
+ ret = typec_mux_set(port->mux, &port->state);
+
+ return ret;
}
static int cros_typec_enable_usb4(struct cros_typec_data *typec,
@@ -569,7 +604,10 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
} else if (port->mux_flags & USB_PD_MUX_USB_ENABLED) {
port->state.alt = NULL;
port->state.mode = TYPEC_STATE_USB;
- ret = typec_mux_set(port->mux, &port->state);
+
+ ret = cros_typec_retimer_set(port->retimer, port->state);
+ if (!ret)
+ ret = typec_mux_set(port->mux, &port->state);
} else {
dev_dbg(typec->dev,
"Unrecognized mode requested, mux flags: %x\n",
--
2.37.0.rc0.161.g10f37bed90-goog
Introduce a driver to configure USB Type-C mode switches and retimers
which are controlled by the Chrome OS EC (Embedded Controller).
This allows Type-C port drivers, as well as alternate mode drivers to
configure their relevant mode switches and retimers according to the
Type-C state they want to achieve.
ACPI devices with ID GOOG001A will bind to this driver.
Currently, we only register a retimer switch with a stub set function.
Subsequent patches will implement the host command set functionality,
and introduce mode switches.
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Prashant Malani <[email protected]>
---
Changes since v2:
- Fixed missing "static" identifier.
- Removed unnecessary new line for function signature.
Changes since v1:
- No changes.
MAINTAINERS | 1 +
drivers/platform/chrome/Kconfig | 11 ++
drivers/platform/chrome/Makefile | 1 +
drivers/platform/chrome/cros_typec_switch.c | 170 ++++++++++++++++++++
4 files changed, 183 insertions(+)
create mode 100644 drivers/platform/chrome/cros_typec_switch.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 7533cb27adc0..35ea91c619b7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4752,6 +4752,7 @@ M: Prashant Malani <[email protected]>
L: [email protected]
S: Maintained
F: drivers/platform/chrome/cros_ec_typec.c
+F: drivers/platform/chrome/cros_typec_switch.c
CHROMEOS EC USB PD NOTIFY DRIVER
M: Prashant Malani <[email protected]>
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 717299cbccac..c62a514a087f 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -265,6 +265,17 @@ config CHROMEOS_PRIVACY_SCREEN
this should probably always be built into the kernel to avoid or
minimize drm probe deferral.
+config CROS_TYPEC_SWITCH
+ tristate "ChromeOS EC Type-C Switch Control"
+ depends on MFD_CROS_EC_DEV && TYPEC
+ default MFD_CROS_EC_DEV
+ help
+ If you say Y here, you get support for configuring the Chrome OS EC Type C
+ muxes and retimers.
+
+ To compile this driver as a module, choose M here: the module will be
+ called cros_typec_switch.
+
source "drivers/platform/chrome/wilco_ec/Kconfig"
endif # CHROMEOS_PLATFORMS
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index 52f5a2dde8b8..0dcaf6a7ed27 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_CHROMEOS_TBMC) += chromeos_tbmc.o
obj-$(CONFIG_CROS_EC) += cros_ec.o
obj-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o
obj-$(CONFIG_CROS_EC_ISHTP) += cros_ec_ishtp.o
+obj-$(CONFIG_CROS_TYPEC_SWITCH) += cros_typec_switch.o
obj-$(CONFIG_CROS_EC_RPMSG) += cros_ec_rpmsg.o
obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o
cros_ec_lpcs-objs := cros_ec_lpc.o cros_ec_lpc_mec.o
diff --git a/drivers/platform/chrome/cros_typec_switch.c b/drivers/platform/chrome/cros_typec_switch.c
new file mode 100644
index 000000000000..0d319e315d57
--- /dev/null
+++ b/drivers/platform/chrome/cros_typec_switch.c
@@ -0,0 +1,170 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022 Google LLC
+ *
+ * This driver provides the ability to configure Type C muxes and retimers which are controlled by
+ * the Chrome OS EC.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_device.h>
+#include <linux/usb/typec_retimer.h>
+
+#define DRV_NAME "cros-typec-switch"
+
+/* Handles and other relevant data required for each port's switches. */
+struct cros_typec_port {
+ int port_num;
+ struct typec_retimer *retimer;
+ struct cros_typec_switch_data *sdata;
+};
+
+/* Driver-specific data. */
+struct cros_typec_switch_data {
+ struct device *dev;
+ struct cros_ec_device *ec;
+ struct cros_typec_port *ports[EC_USB_PD_MAX_PORTS];
+};
+
+static int cros_typec_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
+{
+ return 0;
+}
+
+static void cros_typec_unregister_switches(struct cros_typec_switch_data *sdata)
+{
+ int i;
+
+ for (i = 0; i < EC_USB_PD_MAX_PORTS; i++) {
+ if (!sdata->ports[i])
+ continue;
+ typec_retimer_unregister(sdata->ports[i]->retimer);
+ }
+}
+
+static int cros_typec_register_retimer(struct cros_typec_port *port, struct fwnode_handle *fwnode)
+{
+ struct typec_retimer_desc retimer_desc = {
+ .fwnode = fwnode,
+ .drvdata = port,
+ .name = fwnode_get_name(fwnode),
+ .set = cros_typec_retimer_set,
+ };
+
+ port->retimer = typec_retimer_register(port->sdata->dev, &retimer_desc);
+ if (IS_ERR(port->retimer))
+ return PTR_ERR(port->retimer);
+
+ return 0;
+}
+
+static int cros_typec_register_switches(struct cros_typec_switch_data *sdata)
+{
+ struct cros_typec_port *port = NULL;
+ struct device *dev = sdata->dev;
+ struct fwnode_handle *fwnode;
+ struct acpi_device *adev;
+ unsigned long long index;
+ int ret = 0;
+ int nports;
+
+ nports = device_get_child_node_count(dev);
+ if (nports == 0) {
+ dev_err(dev, "No switch devices found.\n");
+ return -ENODEV;
+ }
+
+ device_for_each_child_node(dev, fwnode) {
+ port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+ if (!port) {
+ ret = -ENOMEM;
+ goto err_switch;
+ }
+
+ adev = to_acpi_device_node(fwnode);
+ if (!adev) {
+ dev_err(fwnode->dev, "Couldn't get ACPI device handle\n");
+ ret = -ENODEV;
+ goto err_switch;
+ }
+
+ ret = acpi_evaluate_integer(adev->handle, "_ADR", NULL, &index);
+ if (ACPI_FAILURE(ret)) {
+ dev_err(fwnode->dev, "_ADR wasn't evaluated\n");
+ ret = -ENODATA;
+ goto err_switch;
+ }
+
+ if (index < 0 || index >= EC_USB_PD_MAX_PORTS) {
+ dev_err(fwnode->dev, "Invalid port index number: %llu", index);
+ ret = -EINVAL;
+ goto err_switch;
+ }
+ port->sdata = sdata;
+ port->port_num = index;
+ sdata->ports[index] = port;
+
+ ret = cros_typec_register_retimer(port, fwnode);
+ if (ret) {
+ dev_err(dev, "Retimer switch register failed\n");
+ goto err_switch;
+ }
+
+ dev_dbg(dev, "Retimer switch registered for index %llu\n", index);
+ }
+
+ return 0;
+err_switch:
+ cros_typec_unregister_switches(sdata);
+ return ret;
+}
+
+static int cros_typec_switch_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cros_typec_switch_data *sdata;
+
+ sdata = devm_kzalloc(dev, sizeof(*sdata), GFP_KERNEL);
+ if (!sdata)
+ return -ENOMEM;
+
+ sdata->dev = dev;
+ sdata->ec = dev_get_drvdata(pdev->dev.parent);
+
+ platform_set_drvdata(pdev, sdata);
+
+ return cros_typec_register_switches(sdata);
+}
+
+static int cros_typec_switch_remove(struct platform_device *pdev)
+{
+ struct cros_typec_switch_data *sdata = platform_get_drvdata(pdev);
+
+ cros_typec_unregister_switches(sdata);
+ return 0;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id cros_typec_switch_acpi_id[] = {
+ { "GOOG001A", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, cros_typec_switch_acpi_id);
+#endif
+
+static struct platform_driver cros_typec_switch_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .acpi_match_table = ACPI_PTR(cros_typec_switch_acpi_id),
+ },
+ .probe = cros_typec_switch_probe,
+ .remove = cros_typec_switch_remove,
+};
+
+module_platform_driver(cros_typec_switch_driver);
+
+MODULE_AUTHOR("Prashant Malani <[email protected]>");
+MODULE_DESCRIPTION("Chrome OS EC Type C Switch control");
+MODULE_LICENSE("GPL");
--
2.37.0.rc0.161.g10f37bed90-goog
Hello!
On 7/8/22 1:20 AM, Prashant Malani wrote:
> Similar to mux and orientation switch, add a handle for registered
> retimer to the port, so that it has handles to the various switches
> connected to it.
>
> Signed-off-by: Prashant Malani <[email protected]>
> ---
>
> Changes since v2:
> - No changes.
>
> Changes since v1:
> - Relinquish retimer reference during typec_release.
>
> drivers/usb/typec/class.c | 9 +++++++++
> drivers/usb/typec/class.h | 1 +
> 2 files changed, 10 insertions(+)
>
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 9062836bb638..f08e32d552b4 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
[...]
> @@ -2249,6 +2251,13 @@ struct typec_port *typec_register_port(struct device *parent,
> return ERR_PTR(ret);
> }
>
> + port->retimer = typec_retimer_get(&port->dev);
> + if (IS_ERR(port->retimer)) {
> + ret = PTR_ERR(port->retimer);
> + put_device(&port->dev);
> + return ERR_PTR(ret);
Why convert it to and fro, and not just return port->retimer?
[...]
MBR, Sergey
On Fri, Jul 08, 2022 at 11:46:44AM +0300, Sergey Shtylyov wrote:
> Hello!
>
> On 7/8/22 1:20 AM, Prashant Malani wrote:
>
> > Similar to mux and orientation switch, add a handle for registered
> > retimer to the port, so that it has handles to the various switches
> > connected to it.
> >
> > Signed-off-by: Prashant Malani <[email protected]>
> > ---
> >
> > Changes since v2:
> > - No changes.
> >
> > Changes since v1:
> > - Relinquish retimer reference during typec_release.
> >
> > drivers/usb/typec/class.c | 9 +++++++++
> > drivers/usb/typec/class.h | 1 +
> > 2 files changed, 10 insertions(+)
> >
> > diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> > index 9062836bb638..f08e32d552b4 100644
> > --- a/drivers/usb/typec/class.c
> > +++ b/drivers/usb/typec/class.c
> [...]
> > @@ -2249,6 +2251,13 @@ struct typec_port *typec_register_port(struct device *parent,
> > return ERR_PTR(ret);
> > }
> >
> > + port->retimer = typec_retimer_get(&port->dev);
> > + if (IS_ERR(port->retimer)) {
> > + ret = PTR_ERR(port->retimer);
> > + put_device(&port->dev);
> > + return ERR_PTR(ret);
>
> Why convert it to and fro, and not just return port->retimer?
That would be a use-after-free as port might now be gone.
thanks,
greg k-h
On 7/8/22 12:21 PM, Greg Kroah-Hartman wrote:
[...]
>>> Similar to mux and orientation switch, add a handle for registered
>>> retimer to the port, so that it has handles to the various switches
>>> connected to it.
>>>
>>> Signed-off-by: Prashant Malani <[email protected]>
>>> ---
>>>
>>> Changes since v2:
>>> - No changes.
>>>
>>> Changes since v1:
>>> - Relinquish retimer reference during typec_release.
>>>
>>> drivers/usb/typec/class.c | 9 +++++++++
>>> drivers/usb/typec/class.h | 1 +
>>> 2 files changed, 10 insertions(+)
>>>
>>> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
>>> index 9062836bb638..f08e32d552b4 100644
>>> --- a/drivers/usb/typec/class.c
>>> +++ b/drivers/usb/typec/class.c
>> [...]
>>> @@ -2249,6 +2251,13 @@ struct typec_port *typec_register_port(struct device *parent,
>>> return ERR_PTR(ret);
>>> }
>>>
>>> + port->retimer = typec_retimer_get(&port->dev);
>>> + if (IS_ERR(port->retimer)) {
>>> + ret = PTR_ERR(port->retimer);
>>> + put_device(&port->dev);
>>> + return ERR_PTR(ret);
>>
>> Why convert it to and fro, and not just return port->retimer?
>
> That would be a use-after-free as port might now be gone.
Ah, indeed!
It would also ensue an explicit pointer cast...
> thanks,
>
> greg k-h
MBR, Sergey
On Thu, Jul 07, 2022 at 10:20:08PM +0000, Prashant Malani wrote:
> Introduce a retimer device class and associated functions that register
> and use retimer "switch" devices. These operate in a manner similar to
> the "mode-switch" and help configure retimers that exist between the
> Type-C connector and host controller(s).
>
> Type C ports can be linked to retimers using firmware node device
> references (again, in a manner similar to "mode-switch").
>
> Signed-off-by: Prashant Malani <[email protected]>
As you are adding things to sysfs, do you need to add any
Documentation/ABI/ entries as well? I can't see any new sysfs files
being created here, but explicitly saying so in the changelog here would
be good.
thanks,
greg k-h
Hi Greg,
On Jul 08 14:38, Greg Kroah-Hartman wrote:
> On Thu, Jul 07, 2022 at 10:20:08PM +0000, Prashant Malani wrote:
> > Introduce a retimer device class and associated functions that register
> > and use retimer "switch" devices. These operate in a manner similar to
> > the "mode-switch" and help configure retimers that exist between the
> > Type-C connector and host controller(s).
> >
> > Type C ports can be linked to retimers using firmware node device
> > references (again, in a manner similar to "mode-switch").
> >
> > Signed-off-by: Prashant Malani <[email protected]>
>
> As you are adding things to sysfs, do you need to add any
> Documentation/ABI/ entries as well? I can't see any new sysfs files
> being created here, but explicitly saying so in the changelog here would
> be good.
There are no new sysfs files being created (there is the new retimer
class directory, but there are no class-specific files being created
there).
I will send out a v4 which calls this out in the changelog.
Best regards,
-Prashant