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Subject[RFC PATCH v3 2/5] usb: typec: Register a device for every mode
Date
Before a device was created for every discovered SVID, but
this will create a device for every discovered mode of every
SVID. The idea is to make it easier to create mode specific
drivers once a bus for the alternate mode is added.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
drivers/usb/typec/class.c | 172 ++++++++++++--------------------------
drivers/usb/typec/tcpm.c | 45 +++++-----
include/linux/usb/typec.h | 37 ++------
3 files changed, 83 insertions(+), 171 deletions(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 3753950a798d..b8a66babd2cd 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -13,31 +13,20 @@
#include <linux/usb/typec.h>
#include <linux/usb/typec_mux.h>

-struct typec_mode {
- int index;
+struct typec_altmode {
+ struct device dev;
+ u16 svid;
+ u8 mode;
+
u32 vdo;
char *desc;
enum typec_port_type roles;
-
- struct typec_altmode *alt_mode;
-
unsigned int active:1;

+ struct attribute *attrs[5];
char group_name[6];
struct attribute_group group;
- struct attribute *attrs[5];
- struct device_attribute vdo_attr;
- struct device_attribute desc_attr;
- struct device_attribute active_attr;
- struct device_attribute roles_attr;
-};
-
-struct typec_altmode {
- struct device dev;
- u16 svid;
- int n_modes;
- struct typec_mode modes[ALTMODE_MAX_MODES];
- const struct attribute_group *mode_groups[ALTMODE_MAX_MODES];
+ const struct attribute_group *groups[2];
};

struct typec_plug {
@@ -177,23 +166,20 @@ static void typec_report_identity(struct device *dev)
/**
* typec_altmode_update_active - Report Enter/Exit mode
* @alt: Handle to the alternate mode
- * @mode: Mode index
* @active: True when the mode has been entered
*
* If a partner or cable plug executes Enter/Exit Mode command successfully, the
* drivers use this routine to report the updated state of the mode.
*/
-void typec_altmode_update_active(struct typec_altmode *alt, int mode,
- bool active)
+void typec_altmode_update_active(struct typec_altmode *alt, bool active)
{
- struct typec_mode *m = &alt->modes[mode];
char dir[6];

- if (m->active == active)
+ if (alt->active == active)
return;

- m->active = active;
- snprintf(dir, sizeof(dir), "mode%d", mode);
+ alt->active = active;
+ snprintf(dir, sizeof(dir), "mode%d", alt->mode);
sysfs_notify(&alt->dev.kobj, dir, "active");
kobject_uevent(&alt->dev.kobj, KOBJ_CHANGE);
}
@@ -220,42 +206,36 @@ struct typec_port *typec_altmode2port(struct typec_altmode *alt)
EXPORT_SYMBOL_GPL(typec_altmode2port);

static ssize_t
-typec_altmode_vdo_show(struct device *dev, struct device_attribute *attr,
- char *buf)
+vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct typec_mode *mode = container_of(attr, struct typec_mode,
- vdo_attr);
+ struct typec_altmode *alt = to_altmode(dev);

- return sprintf(buf, "0x%08x\n", mode->vdo);
+ return sprintf(buf, "0x%08x\n", alt->vdo);
}
+static DEVICE_ATTR_RO(vdo);

static ssize_t
-typec_altmode_desc_show(struct device *dev, struct device_attribute *attr,
- char *buf)
+description_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct typec_mode *mode = container_of(attr, struct typec_mode,
- desc_attr);
+ struct typec_altmode *alt = to_altmode(dev);

- return sprintf(buf, "%s\n", mode->desc ? mode->desc : "");
+ return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
}
+static DEVICE_ATTR_RO(description);

static ssize_t
-typec_altmode_active_show(struct device *dev, struct device_attribute *attr,
- char *buf)
+active_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct typec_mode *mode = container_of(attr, struct typec_mode,
- active_attr);
+ struct typec_altmode *alt = to_altmode(dev);

- return sprintf(buf, "%s\n", mode->active ? "yes" : "no");
+ return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
}

-static ssize_t
-typec_altmode_active_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t size)
+static ssize_t active_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t size)
{
- struct typec_mode *mode = container_of(attr, struct typec_mode,
- active_attr);
- struct typec_port *port = typec_altmode2port(mode->alt_mode);
+ struct typec_altmode *alt = to_altmode(dev);
+ struct typec_port *port = typec_altmode2port(alt);
bool activate;
int ret;

@@ -266,22 +246,22 @@ typec_altmode_active_store(struct device *dev, struct device_attribute *attr,
if (ret)
return ret;

- ret = port->cap->activate_mode(port->cap, mode->index, activate);
+ ret = port->cap->activate_mode(port->cap, alt->mode, activate);
if (ret)
return ret;

return size;
}
+static DEVICE_ATTR_RW(active);

static ssize_t
-typec_altmode_roles_show(struct device *dev, struct device_attribute *attr,
- char *buf)
+supported_roles_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
{
- struct typec_mode *mode = container_of(attr, struct typec_mode,
- roles_attr);
+ struct typec_altmode *alt = to_altmode(dev);
ssize_t ret;

- switch (mode->roles) {
+ switch (alt->roles) {
case TYPEC_PORT_SRC:
ret = sprintf(buf, "source\n");
break;
@@ -295,61 +275,13 @@ typec_altmode_roles_show(struct device *dev, struct device_attribute *attr,
}
return ret;
}
+static DEVICE_ATTR_RO(supported_roles);

-static void typec_init_modes(struct typec_altmode *alt,
- const struct typec_mode_desc *desc, bool is_port)
+static void typec_altmode_release(struct device *dev)
{
- int i;
-
- for (i = 0; i < alt->n_modes; i++, desc++) {
- struct typec_mode *mode = &alt->modes[i];
-
- /* Not considering the human readable description critical */
- mode->desc = kstrdup(desc->desc, GFP_KERNEL);
- if (desc->desc && !mode->desc)
- dev_err(&alt->dev, "failed to copy mode%d desc\n", i);
-
- mode->alt_mode = alt;
- mode->vdo = desc->vdo;
- mode->roles = desc->roles;
- mode->index = desc->index;
- sprintf(mode->group_name, "mode%d", desc->index);
-
- sysfs_attr_init(&mode->vdo_attr.attr);
- mode->vdo_attr.attr.name = "vdo";
- mode->vdo_attr.attr.mode = 0444;
- mode->vdo_attr.show = typec_altmode_vdo_show;
-
- sysfs_attr_init(&mode->desc_attr.attr);
- mode->desc_attr.attr.name = "description";
- mode->desc_attr.attr.mode = 0444;
- mode->desc_attr.show = typec_altmode_desc_show;
-
- sysfs_attr_init(&mode->active_attr.attr);
- mode->active_attr.attr.name = "active";
- mode->active_attr.attr.mode = 0644;
- mode->active_attr.show = typec_altmode_active_show;
- mode->active_attr.store = typec_altmode_active_store;
-
- mode->attrs[0] = &mode->vdo_attr.attr;
- mode->attrs[1] = &mode->desc_attr.attr;
- mode->attrs[2] = &mode->active_attr.attr;
-
- /* With ports, list the roles that the mode is supported with */
- if (is_port) {
- sysfs_attr_init(&mode->roles_attr.attr);
- mode->roles_attr.attr.name = "supported_roles";
- mode->roles_attr.attr.mode = 0444;
- mode->roles_attr.show = typec_altmode_roles_show;
-
- mode->attrs[3] = &mode->roles_attr.attr;
- }
-
- mode->group.attrs = mode->attrs;
- mode->group.name = mode->group_name;
+ struct typec_altmode *alt = to_altmode(dev);

- alt->mode_groups[i] = &mode->group;
- }
+ kfree(alt);
}

static ssize_t svid_show(struct device *dev, struct device_attribute *attr,
@@ -367,16 +299,6 @@ static struct attribute *typec_altmode_attrs[] = {
};
ATTRIBUTE_GROUPS(typec_altmode);

-static void typec_altmode_release(struct device *dev)
-{
- struct typec_altmode *alt = to_altmode(dev);
- int i;
-
- for (i = 0; i < alt->n_modes; i++)
- kfree(alt->modes[i].desc);
- kfree(alt);
-}
-
static const struct device_type typec_altmode_dev_type = {
.name = "typec_alternate_mode",
.groups = typec_altmode_groups,
@@ -395,13 +317,27 @@ typec_register_altmode(struct device *parent,
return ERR_PTR(-ENOMEM);

alt->svid = desc->svid;
- alt->n_modes = desc->n_modes;
- typec_init_modes(alt, desc->modes, is_typec_port(parent));
+ alt->mode = desc->mode;
+ alt->vdo = desc->vdo;
+ alt->roles = desc->roles;
+
+ alt->attrs[0] = &dev_attr_vdo.attr;
+ alt->attrs[1] = &dev_attr_description.attr;
+ alt->attrs[2] = &dev_attr_active.attr;
+
+ if (is_typec_port(parent))
+ alt->attrs[3] = &dev_attr_supported_roles.attr;
+
+ sprintf(alt->group_name, "mode%d", desc->mode);
+ alt->group.name = alt->group_name;
+ alt->group.attrs = alt->attrs;
+ alt->groups[0] = &alt->group;

alt->dev.parent = parent;
- alt->dev.groups = alt->mode_groups;
+ alt->dev.groups = alt->groups;
alt->dev.type = &typec_altmode_dev_type;
- dev_set_name(&alt->dev, "svid-%04x", alt->svid);
+ dev_set_name(&alt->dev, "%s-%04x:%u", dev_name(parent),
+ alt->svid, alt->mode);

ret = device_register(&alt->dev);
if (ret) {
diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
index 72996cca0fe5..c13b986f9d7b 100644
--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -309,8 +309,8 @@ struct tcpm_port {

/* Alternate mode data */
struct pd_mode_data mode_data;
- struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX];
- struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX];
+ struct typec_altmode *partner_altmode[SVID_DISCOVERY_MAX * 6];
+ struct typec_altmode *port_altmode[SVID_DISCOVERY_MAX * 6];

/* Deadline in jiffies to exit src_try_wait state */
unsigned long max_wait;
@@ -998,7 +998,6 @@ static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
{
struct pd_mode_data *pmdata = &port->mode_data;
struct typec_altmode_desc *paltmode;
- struct typec_mode_desc *pmode;
int i;

if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
@@ -1006,32 +1005,28 @@ static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
return;
}

- paltmode = &pmdata->altmode_desc[pmdata->altmodes];
- memset(paltmode, 0, sizeof(*paltmode));
+ for (i = 1; i < cnt; i++) {
+ paltmode = &pmdata->altmode_desc[pmdata->altmodes];
+ memset(paltmode, 0, sizeof(*paltmode));

- paltmode->svid = pmdata->svids[pmdata->svid_index];
+ paltmode->svid = pmdata->svids[pmdata->svid_index];
+ paltmode->mode = i;
+ paltmode->vdo = le32_to_cpu(payload[i]);

- tcpm_log(port, " Alternate mode %d: SVID 0x%04x",
- pmdata->altmodes, paltmode->svid);
+ tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
+ pmdata->altmodes, paltmode->svid,
+ paltmode->mode, paltmode->vdo);

- for (i = 1; i < cnt && paltmode->n_modes < ALTMODE_MAX_MODES; i++) {
- pmode = &paltmode->modes[paltmode->n_modes];
- memset(pmode, 0, sizeof(*pmode));
- pmode->vdo = le32_to_cpu(payload[i]);
- pmode->index = i - 1;
- paltmode->n_modes++;
- tcpm_log(port, " VDO %d: 0x%08x",
- pmode->index, pmode->vdo);
- }
- port->partner_altmode[pmdata->altmodes] =
- typec_partner_register_altmode(port->partner, paltmode);
- if (!port->partner_altmode[pmdata->altmodes]) {
- tcpm_log(port,
- "Failed to register alternate modes for SVID 0x%04x",
- paltmode->svid);
- return;
+ port->partner_altmode[pmdata->altmodes] =
+ typec_partner_register_altmode(port->partner, paltmode);
+ if (!port->partner_altmode[pmdata->altmodes]) {
+ tcpm_log(port,
+ "Failed to register modes for SVID 0x%04x",
+ paltmode->svid);
+ return;
+ }
+ pmdata->altmodes++;
}
- pmdata->altmodes++;
}

#define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 672b39bb0adc..9dbf7f95aa86 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -93,41 +93,23 @@ int typec_partner_set_identity(struct typec_partner *partner);
int typec_cable_set_identity(struct typec_cable *cable);

/*
- * struct typec_mode_desc - Individual Mode of an Alternate Mode
- * @index: Index of the Mode within the SVID
+ * struct typec_altmode_desc - USB Type-C Alternate Mode Descriptor
+ * @svid: Standard or Vendor ID
+ * @mode: Index of the Mode
* @vdo: VDO returned by Discover Modes USB PD command
- * @desc: Optional human readable description of the mode
* @roles: Only for ports. DRP if the mode is available in both roles
*
- * Description of a mode of an Alternate Mode which a connector, cable plug or
- * partner supports. Every mode will have it's own sysfs group. The details are
- * the VDO returned by discover modes command, description for the mode and
- * active flag telling has the mode being entered or not.
+ * Description of an Alternate Mode which a connector, cable plug or partner
+ * supports.
*/
-struct typec_mode_desc {
- int index;
+struct typec_altmode_desc {
+ u16 svid;
+ u8 mode;
u32 vdo;
- char *desc;
/* Only used with ports */
enum typec_port_type roles;
};

-/*
- * struct typec_altmode_desc - USB Type-C Alternate Mode Descriptor
- * @svid: Standard or Vendor ID
- * @n_modes: Number of modes
- * @modes: Array of modes supported by the Alternate Mode
- *
- * Representation of an Alternate Mode that has SVID assigned by USB-IF. The
- * array of modes will list the modes of a particular SVID that are supported by
- * a connector, partner of a cable plug.
- */
-struct typec_altmode_desc {
- u16 svid;
- int n_modes;
- struct typec_mode_desc modes[ALTMODE_MAX_MODES];
-};
-
struct typec_altmode
*typec_partner_register_altmode(struct typec_partner *partner,
const struct typec_altmode_desc *desc);
@@ -141,8 +123,7 @@ void typec_unregister_altmode(struct typec_altmode *altmode);

struct typec_port *typec_altmode2port(struct typec_altmode *alt);

-void typec_altmode_update_active(struct typec_altmode *alt, int mode,
- bool active);
+void typec_altmode_update_active(struct typec_altmode *alt, bool active);

enum typec_plug_index {
TYPEC_PLUG_SOP_P,
--
2.17.0
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