[PATCH v3 3/6] typec: mux: Introduce indirection

Bjorn Andersson
2022-03-03T22:32:16Z

Rather than directly exposing the implementation's representation of the
typec muxes to the controller/clients, introduce an indirection object.

This enables the introduction of turning this relationship into a
one-to-many in the following patch.

Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

Changes since v2:
- Picked up Heikki's ack.

Changes since v1:
- None

drivers/usb/typec/bus.c | 2 +-
drivers/usb/typec/mux.c | 189 ++++++++++++++++----------
drivers/usb/typec/mux.h | 12 +-
drivers/usb/typec/mux/intel_pmc_mux.c | 8 +-
drivers/usb/typec/mux/pi3usb30532.c | 8 +-
include/linux/usb/typec_mux.h | 22 +--
6 files changed, 146 insertions(+), 95 deletions(-)

diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c
index 78e0e78954f2..26ea2fdec17d 100644
--- a/drivers/usb/typec/bus.c
+++ b/drivers/usb/typec/bus.c
@@ -24,7 +24,7 @@ typec_altmode_set_mux(struct altmode *alt, unsigned long conf, void *data)
state.mode = conf;
state.data = data;

- return alt->mux->set(alt->mux, &state);
+ return typec_mux_set(alt->mux, &state);
}

static int typec_altmode_set_state(struct typec_altmode *adev,
diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
index c8340de0ed49..d0b42c297aca 100644
--- a/drivers/usb/typec/mux.c
+++ b/drivers/usb/typec/mux.c
@@ -17,9 +17,13 @@
#include "class.h"
#include "mux.h"

+struct typec_switch {
+ struct typec_switch_dev *sw_dev;
+};
+
static int switch_fwnode_match(struct device *dev, const void *fwnode)
{
- if (!is_typec_switch(dev))
+ if (!is_typec_switch_dev(dev))
return 0;

return dev_fwnode(dev) == fwnode;
@@ -49,7 +53,7 @@ static void *typec_switch_match(struct fwnode_handle *fwnode, const char *id,
dev = class_find_device(&typec_mux_class, NULL, fwnode,
switch_fwnode_match);

- return dev ? to_typec_switch(dev) : ERR_PTR(-EPROBE_DEFER);
+ return dev ? to_typec_switch_dev(dev) : ERR_PTR(-EPROBE_DEFER);
}

/**
@@ -63,12 +67,23 @@ static void *typec_switch_match(struct fwnode_handle *fwnode, const char *id,
*/
struct typec_switch *fwnode_typec_switch_get(struct fwnode_handle *fwnode)
{
+ struct typec_switch_dev *sw_dev;
struct typec_switch *sw;

- sw = fwnode_connection_find_match(fwnode, "orientation-switch", NULL,
- typec_switch_match);
- if (!IS_ERR_OR_NULL(sw))
- WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
+ sw = kzalloc(sizeof(*sw), GFP_KERNEL);
+ if (!sw)
+ return ERR_PTR(-ENOMEM);
+
+ sw_dev = fwnode_connection_find_match(fwnode, "orientation-switch", NULL,
+ typec_switch_match);
+ if (IS_ERR_OR_NULL(sw_dev)) {
+ kfree(sw);
+ return ERR_CAST(sw_dev);
+ }
+
+ WARN_ON(!try_module_get(sw_dev->dev.parent->driver->owner));
+
+ sw->sw_dev = sw_dev;

return sw;
}
@@ -82,16 +97,22 @@ EXPORT_SYMBOL_GPL(fwnode_typec_switch_get);
*/
void typec_switch_put(struct typec_switch *sw)
{
- if (!IS_ERR_OR_NULL(sw)) {
- module_put(sw->dev.parent->driver->owner);
- put_device(&sw->dev);
- }
+ struct typec_switch_dev *sw_dev;
+
+ if (IS_ERR_OR_NULL(sw))
+ return;
+
+ sw_dev = sw->sw_dev;
+
+ module_put(sw_dev->dev.parent->driver->owner);
+ put_device(&sw_dev->dev);
+ kfree(sw);
}
EXPORT_SYMBOL_GPL(typec_switch_put);

static void typec_switch_release(struct device *dev)
{
- kfree(to_typec_switch(dev));
+ kfree(to_typec_switch_dev(dev));
}

const struct device_type typec_switch_dev_type = {
@@ -109,82 +130,90 @@ const struct device_type typec_switch_dev_type = {
* connector to the USB controllers. USB Type-C plugs can be inserted
* right-side-up or upside-down.
*/
-struct typec_switch *
+struct typec_switch_dev *
typec_switch_register(struct device *parent,
const struct typec_switch_desc *desc)
{
- struct typec_switch *sw;
+ struct typec_switch_dev *sw_dev;
int ret;

if (!desc || !desc->set)
return ERR_PTR(-EINVAL);

- sw = kzalloc(sizeof(*sw), GFP_KERNEL);
- if (!sw)
+ sw_dev = kzalloc(sizeof(*sw_dev), GFP_KERNEL);
+ if (!sw_dev)
return ERR_PTR(-ENOMEM);

- sw->set = desc->set;
+ sw_dev->set = desc->set;

- device_initialize(&sw->dev);
- sw->dev.parent = parent;
- sw->dev.fwnode = desc->fwnode;
- sw->dev.class = &typec_mux_class;
- sw->dev.type = &typec_switch_dev_type;
- sw->dev.driver_data = desc->drvdata;
- dev_set_name(&sw->dev, "%s-switch",
+ device_initialize(&sw_dev->dev);
+ sw_dev->dev.parent = parent;
+ sw_dev->dev.fwnode = desc->fwnode;
+ sw_dev->dev.class = &typec_mux_class;
+ sw_dev->dev.type = &typec_switch_dev_type;
+ sw_dev->dev.driver_data = desc->drvdata;
+ dev_set_name(&sw_dev->dev, "%s-switch",
desc->name ? desc->name : dev_name(parent));

- ret = device_add(&sw->dev);
+ ret = device_add(&sw_dev->dev);
if (ret) {
dev_err(parent, "failed to register switch (%d)\n", ret);
- put_device(&sw->dev);
+ put_device(&sw_dev->dev);
return ERR_PTR(ret);
}

- return sw;
+ return sw_dev;
}
EXPORT_SYMBOL_GPL(typec_switch_register);

int typec_switch_set(struct typec_switch *sw,
enum typec_orientation orientation)
{
+ struct typec_switch_dev *sw_dev;
+
if (IS_ERR_OR_NULL(sw))
return 0;

- return sw->set(sw, orientation);
+ sw_dev = sw->sw_dev;
+
+ return sw_dev->set(sw_dev, orientation);
}
EXPORT_SYMBOL_GPL(typec_switch_set);

/**
* typec_switch_unregister - Unregister USB Type-C orientation switch
- * @sw: USB Type-C orientation switch
+ * @sw_dev: USB Type-C orientation switch
*
* Unregister switch that was registered with typec_switch_register().
*/
-void typec_switch_unregister(struct typec_switch *sw)
+void typec_switch_unregister(struct typec_switch_dev *sw_dev)
{
- if (!IS_ERR_OR_NULL(sw))
- device_unregister(&sw->dev);
+ if (!IS_ERR_OR_NULL(sw_dev))
+ device_unregister(&sw_dev->dev);
}
EXPORT_SYMBOL_GPL(typec_switch_unregister);

-void typec_switch_set_drvdata(struct typec_switch *sw, void *data)
+void typec_switch_set_drvdata(struct typec_switch_dev *sw_dev, void *data)
{
- dev_set_drvdata(&sw->dev, data);
+ dev_set_drvdata(&sw_dev->dev, data);
}
EXPORT_SYMBOL_GPL(typec_switch_set_drvdata);

-void *typec_switch_get_drvdata(struct typec_switch *sw)
+void *typec_switch_get_drvdata(struct typec_switch_dev *sw_dev)
{
- return dev_get_drvdata(&sw->dev);
+ return dev_get_drvdata(&sw_dev->dev);
}
EXPORT_SYMBOL_GPL(typec_switch_get_drvdata);

/* ------------------------------------------------------------------------- */

+struct typec_mux {
+ struct typec_mux_dev *mux_dev;
+};
+
static int mux_fwnode_match(struct device *dev, const void *fwnode)
{
- if (!is_typec_mux(dev))
+ if (!is_typec_mux_dev(dev))
return 0;

return dev_fwnode(dev) == fwnode;
@@ -246,7 +275,7 @@ static void *typec_mux_match(struct fwnode_handle *fwnode, const char *id,
dev = class_find_device(&typec_mux_class, NULL, fwnode,
mux_fwnode_match);

- return dev ? to_typec_mux(dev) : ERR_PTR(-EPROBE_DEFER);
+ return dev ? to_typec_mux_dev(dev) : ERR_PTR(-EPROBE_DEFER);
}

/**
@@ -262,12 +291,23 @@ static void *typec_mux_match(struct fwnode_handle *fwnode, const char *id,
struct typec_mux *fwnode_typec_mux_get(struct fwnode_handle *fwnode,
const struct typec_altmode_desc *desc)
{
+ struct typec_mux_dev *mux_dev;
struct typec_mux *mux;

- mux = fwnode_connection_find_match(fwnode, "mode-switch", (void *)desc,
- typec_mux_match);
- if (!IS_ERR_OR_NULL(mux))
- WARN_ON(!try_module_get(mux->dev.parent->driver->owner));
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ return ERR_PTR(-ENOMEM);
+
+ mux_dev = fwnode_connection_find_match(fwnode, "mode-switch", (void *)desc,
+ typec_mux_match);
+ if (IS_ERR_OR_NULL(mux_dev)) {
+ kfree(mux);
+ return ERR_CAST(mux_dev);
+ }
+
+ WARN_ON(!try_module_get(mux_dev->dev.parent->driver->owner));
+
+ mux->mux_dev = mux_dev;

return mux;
}
@@ -281,25 +321,34 @@ EXPORT_SYMBOL_GPL(fwnode_typec_mux_get);
*/
void typec_mux_put(struct typec_mux *mux)
{
- if (!IS_ERR_OR_NULL(mux)) {
- module_put(mux->dev.parent->driver->owner);
- put_device(&mux->dev);
- }
+ struct typec_mux_dev *mux_dev;
+
+ if (IS_ERR_OR_NULL(mux))
+ return;
+
+ mux_dev = mux->mux_dev;
+ module_put(mux_dev->dev.parent->driver->owner);
+ put_device(&mux_dev->dev);
+ kfree(mux);
}
EXPORT_SYMBOL_GPL(typec_mux_put);

int typec_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
{
+ struct typec_mux_dev *mux_dev;
+
if (IS_ERR_OR_NULL(mux))
return 0;

- return mux->set(mux, state);
+ mux_dev = mux->mux_dev;
+
+ return mux_dev->set(mux_dev, state);
}
EXPORT_SYMBOL_GPL(typec_mux_set);

static void typec_mux_release(struct device *dev)
{
- kfree(to_typec_mux(dev));
+ kfree(to_typec_mux_dev(dev));
}

const struct device_type typec_mux_dev_type = {
@@ -317,63 +366,63 @@ const struct device_type typec_mux_dev_type = {
* the pins on the connector need to be reconfigured. This function registers
* multiplexer switches routing the pins on the connector.
*/
-struct typec_mux *
+struct typec_mux_dev *
typec_mux_register(struct device *parent, const struct typec_mux_desc *desc)
{
- struct typec_mux *mux;
+ struct typec_mux_dev *mux_dev;
int ret;

if (!desc || !desc->set)
return ERR_PTR(-EINVAL);

- mux = kzalloc(sizeof(*mux), GFP_KERNEL);
- if (!mux)
+ mux_dev = kzalloc(sizeof(*mux_dev), GFP_KERNEL);
+ if (!mux_dev)
return ERR_PTR(-ENOMEM);

- mux->set = desc->set;
+ mux_dev->set = desc->set;

- device_initialize(&mux->dev);
- mux->dev.parent = parent;
- mux->dev.fwnode = desc->fwnode;
- mux->dev.class = &typec_mux_class;
- mux->dev.type = &typec_mux_dev_type;
- mux->dev.driver_data = desc->drvdata;
- dev_set_name(&mux->dev, "%s-mux",
+ device_initialize(&mux_dev->dev);
+ mux_dev->dev.parent = parent;
+ mux_dev->dev.fwnode = desc->fwnode;
+ mux_dev->dev.class = &typec_mux_class;
+ mux_dev->dev.type = &typec_mux_dev_type;
+ mux_dev->dev.driver_data = desc->drvdata;
+ dev_set_name(&mux_dev->dev, "%s-mux",
desc->name ? desc->name : dev_name(parent));

- ret = device_add(&mux->dev);
+ ret = device_add(&mux_dev->dev);
if (ret) {
dev_err(parent, "failed to register mux (%d)\n", ret);
- put_device(&mux->dev);
+ put_device(&mux_dev->dev);
return ERR_PTR(ret);
}

- return mux;
+ return mux_dev;
}
EXPORT_SYMBOL_GPL(typec_mux_register);

/**
* typec_mux_unregister - Unregister Multiplexer Switch
- * @mux: USB Type-C Connector Multiplexer/DeMultiplexer
+ * @mux_dev: USB Type-C Connector Multiplexer/DeMultiplexer
*
* Unregister mux that was registered with typec_mux_register().
*/
-void typec_mux_unregister(struct typec_mux *mux)
+void typec_mux_unregister(struct typec_mux_dev *mux_dev)
{
- if (!IS_ERR_OR_NULL(mux))
- device_unregister(&mux->dev);
+ if (!IS_ERR_OR_NULL(mux_dev))
+ device_unregister(&mux_dev->dev);
}
EXPORT_SYMBOL_GPL(typec_mux_unregister);

-void typec_mux_set_drvdata(struct typec_mux *mux, void *data)
+void typec_mux_set_drvdata(struct typec_mux_dev *mux_dev, void *data)
{
- dev_set_drvdata(&mux->dev, data);
+ dev_set_drvdata(&mux_dev->dev, data);
}
EXPORT_SYMBOL_GPL(typec_mux_set_drvdata);

-void *typec_mux_get_drvdata(struct typec_mux *mux)
+void *typec_mux_get_drvdata(struct typec_mux_dev *mux_dev)
{
- return dev_get_drvdata(&mux->dev);
+ return dev_get_drvdata(&mux_dev->dev);
}
EXPORT_SYMBOL_GPL(typec_mux_get_drvdata);

diff --git a/drivers/usb/typec/mux.h b/drivers/usb/typec/mux.h
index b1d6e837cb74..58f0f28b6dc8 100644
--- a/drivers/usb/typec/mux.h
+++ b/drivers/usb/typec/mux.h
@@ -5,23 +5,23 @@

#include <linux/usb/typec_mux.h>

-struct typec_switch {
+struct typec_switch_dev {
struct device dev;
typec_switch_set_fn_t set;
};

-struct typec_mux {
+struct typec_mux_dev {
struct device dev;
typec_mux_set_fn_t set;
};

-#define to_typec_switch(_dev_) container_of(_dev_, struct typec_switch, dev)
-#define to_typec_mux(_dev_) container_of(_dev_, struct typec_mux, dev)
+#define to_typec_switch_dev(_dev_) container_of(_dev_, struct typec_switch_dev, dev)
+#define to_typec_mux_dev(_dev_) container_of(_dev_, struct typec_mux_dev, dev)

extern const struct device_type typec_switch_dev_type;
extern const struct device_type typec_mux_dev_type;

-#define is_typec_switch(dev) ((dev)->type == &typec_switch_dev_type)
-#define is_typec_mux(dev) ((dev)->type == &typec_mux_dev_type)
+#define is_typec_switch_dev(dev) ((dev)->type == &typec_switch_dev_type)
+#define is_typec_mux_dev(dev) ((dev)->type == &typec_mux_dev_type)

#endif /* __USB_TYPEC_MUX__ */
diff --git a/drivers/usb/typec/mux/intel_pmc_mux.c b/drivers/usb/typec/mux/intel_pmc_mux.c
index 2cdd22130834..51d8f3b88128 100644
--- a/drivers/usb/typec/mux/intel_pmc_mux.c
+++ b/drivers/usb/typec/mux/intel_pmc_mux.c
@@ -121,8 +121,8 @@ struct pmc_usb_port {
int num;
u32 iom_status;
struct pmc_usb *pmc;
- struct typec_mux *typec_mux;
- struct typec_switch *typec_sw;
+ struct typec_mux_dev *typec_mux;
+ struct typec_switch_dev *typec_sw;
struct usb_role_switch *usb_sw;

enum typec_orientation orientation;
@@ -416,7 +416,7 @@ static int pmc_usb_connect(struct pmc_usb_port *port, enum usb_role role)
}

static int
-pmc_usb_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
+pmc_usb_mux_set(struct typec_mux_dev *mux, struct typec_mux_state *state)
{
struct pmc_usb_port *port = typec_mux_get_drvdata(mux);

@@ -452,7 +452,7 @@ pmc_usb_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
return -EOPNOTSUPP;
}

-static int pmc_usb_set_orientation(struct typec_switch *sw,
+static int pmc_usb_set_orientation(struct typec_switch_dev *sw,
enum typec_orientation orientation)
{
struct pmc_usb_port *port = typec_switch_get_drvdata(sw);
diff --git a/drivers/usb/typec/mux/pi3usb30532.c b/drivers/usb/typec/mux/pi3usb30532.c
index 7afe275b17d0..6ce9f282594e 100644
--- a/drivers/usb/typec/mux/pi3usb30532.c
+++ b/drivers/usb/typec/mux/pi3usb30532.c
@@ -23,8 +23,8 @@
struct pi3usb30532 {
struct i2c_client *client;
struct mutex lock; /* protects the cached conf register */
- struct typec_switch *sw;
- struct typec_mux *mux;
+ struct typec_switch_dev *sw;
+ struct typec_mux_dev *mux;
u8 conf;
};

@@ -45,7 +45,7 @@ static int pi3usb30532_set_conf(struct pi3usb30532 *pi, u8 new_conf)
return 0;
}

-static int pi3usb30532_sw_set(struct typec_switch *sw,
+static int pi3usb30532_sw_set(struct typec_switch_dev *sw,
enum typec_orientation orientation)
{
struct pi3usb30532 *pi = typec_switch_get_drvdata(sw);
@@ -74,7 +74,7 @@ static int pi3usb30532_sw_set(struct typec_switch *sw,
}

static int
-pi3usb30532_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
+pi3usb30532_mux_set(struct typec_mux_dev *mux, struct typec_mux_state *state)
{
struct pi3usb30532 *pi = typec_mux_get_drvdata(mux);
u8 new_conf;
diff --git a/include/linux/usb/typec_mux.h b/include/linux/usb/typec_mux.h
index a9d9957933dc..ee57781dcf28 100644
--- a/include/linux/usb/typec_mux.h
+++ b/include/linux/usb/typec_mux.h
@@ -8,11 +8,13 @@

struct device;
struct typec_mux;
+struct typec_mux_dev;
struct typec_switch;
+struct typec_switch_dev;
struct typec_altmode;
struct fwnode_handle;

-typedef int (*typec_switch_set_fn_t)(struct typec_switch *sw,
+typedef int (*typec_switch_set_fn_t)(struct typec_switch_dev *sw,
enum typec_orientation orientation);

struct typec_switch_desc {
@@ -32,13 +34,13 @@ static inline struct typec_switch *typec_switch_get(struct device *dev)
return fwnode_typec_switch_get(dev_fwnode(dev));
}

-struct typec_switch *
+struct typec_switch_dev *
typec_switch_register(struct device *parent,
const struct typec_switch_desc *desc);
-void typec_switch_unregister(struct typec_switch *sw);
+void typec_switch_unregister(struct typec_switch_dev *sw);

-void typec_switch_set_drvdata(struct typec_switch *sw, void *data);
-void *typec_switch_get_drvdata(struct typec_switch *sw);
+void typec_switch_set_drvdata(struct typec_switch_dev *sw, void *data);
+void *typec_switch_get_drvdata(struct typec_switch_dev *sw);

struct typec_mux_state {
struct typec_altmode *alt;
@@ -46,7 +48,7 @@ struct typec_mux_state {
void *data;
};

-typedef int (*typec_mux_set_fn_t)(struct typec_mux *mux,
+typedef int (*typec_mux_set_fn_t)(struct typec_mux_dev *mux,
struct typec_mux_state *state);

struct typec_mux_desc {
@@ -67,11 +69,11 @@ typec_mux_get(struct device *dev, const struct typec_altmode_desc *desc)
return fwnode_typec_mux_get(dev_fwnode(dev), desc);
}

-struct typec_mux *
+struct typec_mux_dev *
typec_mux_register(struct device *parent, const struct typec_mux_desc *desc);
-void typec_mux_unregister(struct typec_mux *mux);
+void typec_mux_unregister(struct typec_mux_dev *mux);

-void typec_mux_set_drvdata(struct typec_mux *mux, void *data);
-void *typec_mux_get_drvdata(struct typec_mux *mux);
+void typec_mux_set_drvdata(struct typec_mux_dev *mux, void *data);
+void *typec_mux_get_drvdata(struct typec_mux_dev *mux);

#endif /* __USB_TYPEC_MUX */
--
2.33.1