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interface.c
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/*
* Greybus interface code
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include <linux/delay.h>
#include "greybus.h"
#include "greybus_trace.h"
#define GB_INTERFACE_MODE_SWITCH_TIMEOUT 2000
#define GB_INTERFACE_DEVICE_ID_BAD 0xff
#define GB_INTERFACE_AUTOSUSPEND_MS 3000
/* Time required for interface to enter standby before disabling REFCLK */
#define GB_INTERFACE_SUSPEND_HIBERNATE_DELAY_MS 20
/* Don't-care selector index */
#define DME_SELECTOR_INDEX_NULL 0
/* DME attributes */
/* FIXME: remove ES2 support and DME_T_TST_SRC_INCREMENT */
#define DME_T_TST_SRC_INCREMENT 0x4083
#define DME_DDBL1_MANUFACTURERID 0x5003
#define DME_DDBL1_PRODUCTID 0x5004
#define DME_TOSHIBA_GMP_VID 0x6000
#define DME_TOSHIBA_GMP_PID 0x6001
#define DME_TOSHIBA_GMP_SN0 0x6002
#define DME_TOSHIBA_GMP_SN1 0x6003
#define DME_TOSHIBA_GMP_INIT_STATUS 0x6101
/* DDBL1 Manufacturer and Product ids */
#define TOSHIBA_DMID 0x0126
#define TOSHIBA_ES2_BRIDGE_DPID 0x1000
#define TOSHIBA_ES3_APBRIDGE_DPID 0x1001
#define TOSHIBA_ES3_GBPHY_DPID 0x1002
static int gb_interface_hibernate_link(struct gb_interface *intf);
static int gb_interface_refclk_set(struct gb_interface *intf, bool enable);
static int gb_interface_dme_attr_get(struct gb_interface *intf,
u16 attr, u32 *val)
{
return gb_svc_dme_peer_get(intf->hd->svc, intf->interface_id,
attr, DME_SELECTOR_INDEX_NULL, val);
}
static int gb_interface_read_ara_dme(struct gb_interface *intf)
{
u32 sn0, sn1;
int ret;
/*
* Unless this is a Toshiba bridge, bail out until we have defined
* standard GMP attributes.
*/
if (intf->ddbl1_manufacturer_id != TOSHIBA_DMID) {
dev_err(&intf->dev, "unknown manufacturer %08x\n",
intf->ddbl1_manufacturer_id);
return -ENODEV;
}
ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_VID,
&intf->vendor_id);
if (ret)
return ret;
ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_PID,
&intf->product_id);
if (ret)
return ret;
ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_SN0, &sn0);
if (ret)
return ret;
ret = gb_interface_dme_attr_get(intf, DME_TOSHIBA_GMP_SN1, &sn1);
if (ret)
return ret;
intf->serial_number = (u64)sn1 << 32 | sn0;
return 0;
}
static int gb_interface_read_dme(struct gb_interface *intf)
{
int ret;
/* DME attributes have already been read */
if (intf->dme_read)
return 0;
ret = gb_interface_dme_attr_get(intf, DME_DDBL1_MANUFACTURERID,
&intf->ddbl1_manufacturer_id);
if (ret)
return ret;
ret = gb_interface_dme_attr_get(intf, DME_DDBL1_PRODUCTID,
&intf->ddbl1_product_id);
if (ret)
return ret;
if (intf->ddbl1_manufacturer_id == TOSHIBA_DMID &&
intf->ddbl1_product_id == TOSHIBA_ES2_BRIDGE_DPID) {
intf->quirks |= GB_INTERFACE_QUIRK_NO_GMP_IDS;
intf->quirks |= GB_INTERFACE_QUIRK_NO_INIT_STATUS;
}
ret = gb_interface_read_ara_dme(intf);
if (ret)
return ret;
intf->dme_read = true;
return 0;
}
static int gb_interface_route_create(struct gb_interface *intf)
{
struct gb_svc *svc = intf->hd->svc;
u8 intf_id = intf->interface_id;
u8 device_id;
int ret;
/* Allocate an interface device id. */
ret = ida_simple_get(&svc->device_id_map,
GB_SVC_DEVICE_ID_MIN, GB_SVC_DEVICE_ID_MAX + 1,
GFP_KERNEL);
if (ret < 0) {
dev_err(&intf->dev, "failed to allocate device id: %d\n", ret);
return ret;
}
device_id = ret;
ret = gb_svc_intf_device_id(svc, intf_id, device_id);
if (ret) {
dev_err(&intf->dev, "failed to set device id %u: %d\n",
device_id, ret);
goto err_ida_remove;
}
/* FIXME: Hard-coded AP device id. */
ret = gb_svc_route_create(svc, svc->ap_intf_id, GB_SVC_DEVICE_ID_AP,
intf_id, device_id);
if (ret) {
dev_err(&intf->dev, "failed to create route: %d\n", ret);
goto err_svc_id_free;
}
intf->device_id = device_id;
return 0;
err_svc_id_free:
/*
* XXX Should we tell SVC that this id doesn't belong to interface
* XXX anymore.
*/
err_ida_remove:
ida_simple_remove(&svc->device_id_map, device_id);
return ret;
}
static void gb_interface_route_destroy(struct gb_interface *intf)
{
struct gb_svc *svc = intf->hd->svc;
if (intf->device_id == GB_INTERFACE_DEVICE_ID_BAD)
return;
gb_svc_route_destroy(svc, svc->ap_intf_id, intf->interface_id);
ida_simple_remove(&svc->device_id_map, intf->device_id);
intf->device_id = GB_INTERFACE_DEVICE_ID_BAD;
}
/* Locking: Caller holds the interface mutex. */
static int gb_interface_legacy_mode_switch(struct gb_interface *intf)
{
int ret;
dev_info(&intf->dev, "legacy mode switch detected\n");
/* Mark as disconnected to prevent I/O during disable. */
intf->disconnected = true;
gb_interface_disable(intf);
intf->disconnected = false;
ret = gb_interface_enable(intf);
if (ret) {
dev_err(&intf->dev, "failed to re-enable interface: %d\n", ret);
gb_interface_deactivate(intf);
}
return ret;
}
void gb_interface_mailbox_event(struct gb_interface *intf, u16 result,
u32 mailbox)
{
mutex_lock(&intf->mutex);
if (result) {
dev_warn(&intf->dev,
"mailbox event with UniPro error: 0x%04x\n",
result);
goto err_disable;
}
if (mailbox != GB_SVC_INTF_MAILBOX_GREYBUS) {
dev_warn(&intf->dev,
"mailbox event with unexpected value: 0x%08x\n",
mailbox);
goto err_disable;
}
if (intf->quirks & GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH) {
gb_interface_legacy_mode_switch(intf);
goto out_unlock;
}
if (!intf->mode_switch) {
dev_warn(&intf->dev, "unexpected mailbox event: 0x%08x\n",
mailbox);
goto err_disable;
}
dev_info(&intf->dev, "mode switch detected\n");
complete(&intf->mode_switch_completion);
out_unlock:
mutex_unlock(&intf->mutex);
return;
err_disable:
gb_interface_disable(intf);
gb_interface_deactivate(intf);
mutex_unlock(&intf->mutex);
}
static void gb_interface_mode_switch_work(struct work_struct *work)
{
struct gb_interface *intf;
struct gb_control *control;
unsigned long timeout;
int ret;
intf = container_of(work, struct gb_interface, mode_switch_work);
mutex_lock(&intf->mutex);
/* Make sure interface is still enabled. */
if (!intf->enabled) {
dev_dbg(&intf->dev, "mode switch aborted\n");
intf->mode_switch = false;
mutex_unlock(&intf->mutex);
goto out_interface_put;
}
/*
* Prepare the control device for mode switch and make sure to get an
* extra reference before it goes away during interface disable.
*/
control = gb_control_get(intf->control);
gb_control_mode_switch_prepare(control);
gb_interface_disable(intf);
mutex_unlock(&intf->mutex);
timeout = msecs_to_jiffies(GB_INTERFACE_MODE_SWITCH_TIMEOUT);
ret = wait_for_completion_interruptible_timeout(
&intf->mode_switch_completion, timeout);
/* Finalise control-connection mode switch. */
gb_control_mode_switch_complete(control);
gb_control_put(control);
if (ret < 0) {
dev_err(&intf->dev, "mode switch interrupted\n");
goto err_deactivate;
} else if (ret == 0) {
dev_err(&intf->dev, "mode switch timed out\n");
goto err_deactivate;
}
/* Re-enable (re-enumerate) interface if still active. */
mutex_lock(&intf->mutex);
intf->mode_switch = false;
if (intf->active) {
ret = gb_interface_enable(intf);
if (ret) {
dev_err(&intf->dev, "failed to re-enable interface: %d\n",
ret);
gb_interface_deactivate(intf);
}
}
mutex_unlock(&intf->mutex);
out_interface_put:
gb_interface_put(intf);
return;
err_deactivate:
mutex_lock(&intf->mutex);
intf->mode_switch = false;
gb_interface_deactivate(intf);
mutex_unlock(&intf->mutex);
gb_interface_put(intf);
}
int gb_interface_request_mode_switch(struct gb_interface *intf)
{
int ret = 0;
mutex_lock(&intf->mutex);
if (intf->mode_switch) {
ret = -EBUSY;
goto out_unlock;
}
intf->mode_switch = true;
reinit_completion(&intf->mode_switch_completion);
/*
* Get a reference to the interface device, which will be put once the
* mode switch is complete.
*/
get_device(&intf->dev);
if (!queue_work(system_long_wq, &intf->mode_switch_work)) {
put_device(&intf->dev);
ret = -EBUSY;
goto out_unlock;
}
out_unlock:
mutex_unlock(&intf->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(gb_interface_request_mode_switch);
/*
* T_TstSrcIncrement is written by the module on ES2 as a stand-in for the
* init-status attribute DME_TOSHIBA_INIT_STATUS. The AP needs to read and
* clear it after reading a non-zero value from it.
*
* FIXME: This is module-hardware dependent and needs to be extended for every
* type of module we want to support.
*/
static int gb_interface_read_and_clear_init_status(struct gb_interface *intf)
{
struct gb_host_device *hd = intf->hd;
unsigned long bootrom_quirks;
unsigned long s2l_quirks;
int ret;
u32 value;
u16 attr;
u8 init_status;
/*
* ES2 bridges use T_TstSrcIncrement for the init status.
*
* FIXME: Remove ES2 support
*/
if (intf->quirks & GB_INTERFACE_QUIRK_NO_INIT_STATUS)
attr = DME_T_TST_SRC_INCREMENT;
else
attr = DME_TOSHIBA_GMP_INIT_STATUS;
ret = gb_svc_dme_peer_get(hd->svc, intf->interface_id, attr,
DME_SELECTOR_INDEX_NULL, &value);
if (ret)
return ret;
/*
* A nonzero init status indicates the module has finished
* initializing.
*/
if (!value) {
dev_err(&intf->dev, "invalid init status\n");
return -ENODEV;
}
/*
* Extract the init status.
*
* For ES2: We need to check lowest 8 bits of 'value'.
* For ES3: We need to check highest 8 bits out of 32 of 'value'.
*
* FIXME: Remove ES2 support
*/
if (intf->quirks & GB_INTERFACE_QUIRK_NO_INIT_STATUS)
init_status = value & 0xff;
else
init_status = value >> 24;
/*
* Check if the interface is executing the quirky ES3 bootrom that,
* for example, requires E2EFC, CSD and CSV to be disabled.
*/
bootrom_quirks = GB_INTERFACE_QUIRK_NO_CPORT_FEATURES |
GB_INTERFACE_QUIRK_FORCED_DISABLE |
GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH |
GB_INTERFACE_QUIRK_NO_BUNDLE_ACTIVATE;
s2l_quirks = GB_INTERFACE_QUIRK_NO_PM;
switch (init_status) {
case GB_INIT_BOOTROM_UNIPRO_BOOT_STARTED:
case GB_INIT_BOOTROM_FALLBACK_UNIPRO_BOOT_STARTED:
intf->quirks |= bootrom_quirks;
break;
case GB_INIT_S2_LOADER_BOOT_STARTED:
/* S2 Loader doesn't support runtime PM */
intf->quirks &= ~bootrom_quirks;
intf->quirks |= s2l_quirks;
break;
default:
intf->quirks &= ~bootrom_quirks;
intf->quirks &= ~s2l_quirks;
}
/* Clear the init status. */
return gb_svc_dme_peer_set(hd->svc, intf->interface_id, attr,
DME_SELECTOR_INDEX_NULL, 0);
}
/* interface sysfs attributes */
#define gb_interface_attr(field, type) \
static ssize_t field##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct gb_interface *intf = to_gb_interface(dev); \
return scnprintf(buf, PAGE_SIZE, type"\n", intf->field); \
} \
static DEVICE_ATTR_RO(field)
gb_interface_attr(ddbl1_manufacturer_id, "0x%08x");
gb_interface_attr(ddbl1_product_id, "0x%08x");
gb_interface_attr(interface_id, "%u");
gb_interface_attr(vendor_id, "0x%08x");
gb_interface_attr(product_id, "0x%08x");
gb_interface_attr(serial_number, "0x%016llx");
static ssize_t voltage_now_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
int ret;
u32 measurement;
ret = gb_svc_pwrmon_intf_sample_get(intf->hd->svc, intf->interface_id,
GB_SVC_PWRMON_TYPE_VOL,
&measurement);
if (ret) {
dev_err(&intf->dev, "failed to get voltage sample (%d)\n", ret);
return ret;
}
return sprintf(buf, "%u\n", measurement);
}
static DEVICE_ATTR_RO(voltage_now);
static ssize_t current_now_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
int ret;
u32 measurement;
ret = gb_svc_pwrmon_intf_sample_get(intf->hd->svc, intf->interface_id,
GB_SVC_PWRMON_TYPE_CURR,
&measurement);
if (ret) {
dev_err(&intf->dev, "failed to get current sample (%d)\n", ret);
return ret;
}
return sprintf(buf, "%u\n", measurement);
}
static DEVICE_ATTR_RO(current_now);
static ssize_t power_now_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
int ret;
u32 measurement;
ret = gb_svc_pwrmon_intf_sample_get(intf->hd->svc, intf->interface_id,
GB_SVC_PWRMON_TYPE_PWR,
&measurement);
if (ret) {
dev_err(&intf->dev, "failed to get power sample (%d)\n", ret);
return ret;
}
return sprintf(buf, "%u\n", measurement);
}
static DEVICE_ATTR_RO(power_now);
static ssize_t power_state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
if (intf->active)
return scnprintf(buf, PAGE_SIZE, "on\n");
else
return scnprintf(buf, PAGE_SIZE, "off\n");
}
static ssize_t power_state_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t len)
{
struct gb_interface *intf = to_gb_interface(dev);
bool activate;
int ret = 0;
if (kstrtobool(buf, &activate))
return -EINVAL;
mutex_lock(&intf->mutex);
if (activate == intf->active)
goto unlock;
if (activate) {
ret = gb_interface_activate(intf);
if (ret) {
dev_err(&intf->dev,
"failed to activate interface: %d\n", ret);
goto unlock;
}
ret = gb_interface_enable(intf);
if (ret) {
dev_err(&intf->dev,
"failed to enable interface: %d\n", ret);
gb_interface_deactivate(intf);
goto unlock;
}
} else {
gb_interface_disable(intf);
gb_interface_deactivate(intf);
}
unlock:
mutex_unlock(&intf->mutex);
if (ret)
return ret;
return len;
}
static DEVICE_ATTR_RW(power_state);
static const char *gb_interface_type_string(struct gb_interface *intf)
{
static const char * const types[] = {
[GB_INTERFACE_TYPE_INVALID] = "invalid",
[GB_INTERFACE_TYPE_UNKNOWN] = "unknown",
[GB_INTERFACE_TYPE_DUMMY] = "dummy",
[GB_INTERFACE_TYPE_UNIPRO] = "unipro",
[GB_INTERFACE_TYPE_GREYBUS] = "greybus",
};
return types[intf->type];
}
static ssize_t interface_type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct gb_interface *intf = to_gb_interface(dev);
return sprintf(buf, "%s\n", gb_interface_type_string(intf));
}
static DEVICE_ATTR_RO(interface_type);
static struct attribute *interface_unipro_attrs[] = {
&dev_attr_ddbl1_manufacturer_id.attr,
&dev_attr_ddbl1_product_id.attr,
NULL
};
static struct attribute *interface_greybus_attrs[] = {
&dev_attr_vendor_id.attr,
&dev_attr_product_id.attr,
&dev_attr_serial_number.attr,
NULL
};
static struct attribute *interface_power_attrs[] = {
&dev_attr_voltage_now.attr,
&dev_attr_current_now.attr,
&dev_attr_power_now.attr,
&dev_attr_power_state.attr,
NULL
};
static struct attribute *interface_common_attrs[] = {
&dev_attr_interface_id.attr,
&dev_attr_interface_type.attr,
NULL
};
static umode_t interface_unipro_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct gb_interface *intf = to_gb_interface(dev);
switch (intf->type) {
case GB_INTERFACE_TYPE_UNIPRO:
case GB_INTERFACE_TYPE_GREYBUS:
return attr->mode;
default:
return 0;
}
}
static umode_t interface_greybus_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct gb_interface *intf = to_gb_interface(dev);
switch (intf->type) {
case GB_INTERFACE_TYPE_GREYBUS:
return attr->mode;
default:
return 0;
}
}
static umode_t interface_power_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct gb_interface *intf = to_gb_interface(dev);
switch (intf->type) {
case GB_INTERFACE_TYPE_UNIPRO:
case GB_INTERFACE_TYPE_GREYBUS:
return attr->mode;
default:
return 0;
}
}
static const struct attribute_group interface_unipro_group = {
.is_visible = interface_unipro_is_visible,
.attrs = interface_unipro_attrs,
};
static const struct attribute_group interface_greybus_group = {
.is_visible = interface_greybus_is_visible,
.attrs = interface_greybus_attrs,
};
static const struct attribute_group interface_power_group = {
.is_visible = interface_power_is_visible,
.attrs = interface_power_attrs,
};
static const struct attribute_group interface_common_group = {
.attrs = interface_common_attrs,
};
static const struct attribute_group *interface_groups[] = {
&interface_unipro_group,
&interface_greybus_group,
&interface_power_group,
&interface_common_group,
NULL
};
static void gb_interface_release(struct device *dev)
{
struct gb_interface *intf = to_gb_interface(dev);
trace_gb_interface_release(intf);
kfree(intf);
}
#ifdef CONFIG_PM_RUNTIME
static int gb_interface_suspend(struct device *dev)
{
struct gb_interface *intf = to_gb_interface(dev);
int ret, timesync_ret;
ret = gb_control_interface_suspend_prepare(intf->control);
if (ret)
return ret;
gb_timesync_interface_remove(intf);
ret = gb_control_suspend(intf->control);
if (ret)
goto err_hibernate_abort;
ret = gb_interface_hibernate_link(intf);
if (ret)
return ret;
/* Delay to allow interface to enter standby before disabling refclk */
msleep(GB_INTERFACE_SUSPEND_HIBERNATE_DELAY_MS);
ret = gb_interface_refclk_set(intf, false);
if (ret)
return ret;
return 0;
err_hibernate_abort:
gb_control_interface_hibernate_abort(intf->control);
timesync_ret = gb_timesync_interface_add(intf);
if (timesync_ret) {
dev_err(dev, "failed to add to timesync: %d\n", timesync_ret);
return timesync_ret;
}
return ret;
}
static int gb_interface_resume(struct device *dev)
{
struct gb_interface *intf = to_gb_interface(dev);
struct gb_svc *svc = intf->hd->svc;
int ret;
ret = gb_interface_refclk_set(intf, true);
if (ret)
return ret;
ret = gb_svc_intf_resume(svc, intf->interface_id);
if (ret)
return ret;
ret = gb_control_resume(intf->control);
if (ret)
return ret;
ret = gb_timesync_interface_add(intf);
if (ret) {
dev_err(dev, "failed to add to timesync: %d\n", ret);
return ret;
}
ret = gb_timesync_schedule_synchronous(intf);
if (ret) {
dev_err(dev, "failed to synchronize FrameTime: %d\n", ret);
return ret;
}
return 0;
}
static int gb_interface_runtime_idle(struct device *dev)
{
pm_runtime_mark_last_busy(dev);
pm_request_autosuspend(dev);
return 0;
}
#endif
static const struct dev_pm_ops gb_interface_pm_ops = {
SET_RUNTIME_PM_OPS(gb_interface_suspend, gb_interface_resume,
gb_interface_runtime_idle)
};
struct device_type greybus_interface_type = {
.name = "greybus_interface",
.release = gb_interface_release,
.pm = &gb_interface_pm_ops,
};
/*
* A Greybus module represents a user-replaceable component on a GMP
* phone. An interface is the physical connection on that module. A
* module may have more than one interface.
*
* Create a gb_interface structure to represent a discovered interface.
* The position of interface within the Endo is encoded in "interface_id"
* argument.
*
* Returns a pointer to the new interfce or a null pointer if a
* failure occurs due to memory exhaustion.
*/
struct gb_interface *gb_interface_create(struct gb_module *module,
u8 interface_id)
{
struct gb_host_device *hd = module->hd;
struct gb_interface *intf;
intf = kzalloc(sizeof(*intf), GFP_KERNEL);
if (!intf)
return NULL;
intf->hd = hd; /* XXX refcount? */
intf->module = module;
intf->interface_id = interface_id;
INIT_LIST_HEAD(&intf->bundles);
INIT_LIST_HEAD(&intf->manifest_descs);
mutex_init(&intf->mutex);
INIT_WORK(&intf->mode_switch_work, gb_interface_mode_switch_work);
init_completion(&intf->mode_switch_completion);
/* Invalid device id to start with */
intf->device_id = GB_INTERFACE_DEVICE_ID_BAD;
intf->dev.parent = &module->dev;
intf->dev.bus = &greybus_bus_type;
intf->dev.type = &greybus_interface_type;
intf->dev.groups = interface_groups;
intf->dev.dma_mask = module->dev.dma_mask;
device_initialize(&intf->dev);
dev_set_name(&intf->dev, "%s.%u", dev_name(&module->dev),
interface_id);
pm_runtime_set_autosuspend_delay(&intf->dev,
GB_INTERFACE_AUTOSUSPEND_MS);
trace_gb_interface_create(intf);
return intf;
}
static int gb_interface_vsys_set(struct gb_interface *intf, bool enable)
{
struct gb_svc *svc = intf->hd->svc;
int ret;
dev_dbg(&intf->dev, "%s - %d\n", __func__, enable);
ret = gb_svc_intf_vsys_set(svc, intf->interface_id, enable);
if (ret) {
dev_err(&intf->dev, "failed to set v_sys: %d\n", ret);
return ret;
}
return 0;
}
static int gb_interface_refclk_set(struct gb_interface *intf, bool enable)
{
struct gb_svc *svc = intf->hd->svc;
int ret;
dev_dbg(&intf->dev, "%s - %d\n", __func__, enable);
ret = gb_svc_intf_refclk_set(svc, intf->interface_id, enable);
if (ret) {
dev_err(&intf->dev, "failed to set refclk: %d\n", ret);
return ret;
}
return 0;
}
static int gb_interface_unipro_set(struct gb_interface *intf, bool enable)
{
struct gb_svc *svc = intf->hd->svc;
int ret;
dev_dbg(&intf->dev, "%s - %d\n", __func__, enable);
ret = gb_svc_intf_unipro_set(svc, intf->interface_id, enable);
if (ret) {
dev_err(&intf->dev, "failed to set UniPro: %d\n", ret);
return ret;
}
return 0;
}
static int gb_interface_activate_operation(struct gb_interface *intf,
enum gb_interface_type *intf_type)
{
struct gb_svc *svc = intf->hd->svc;
u8 type;
int ret;
dev_dbg(&intf->dev, "%s\n", __func__);
ret = gb_svc_intf_activate(svc, intf->interface_id, &type);
if (ret) {
dev_err(&intf->dev, "failed to activate: %d\n", ret);
return ret;
}
switch (type) {
case GB_SVC_INTF_TYPE_DUMMY:
*intf_type = GB_INTERFACE_TYPE_DUMMY;
/* FIXME: handle as an error for now */
return -ENODEV;
case GB_SVC_INTF_TYPE_UNIPRO:
*intf_type = GB_INTERFACE_TYPE_UNIPRO;
dev_err(&intf->dev, "interface type UniPro not supported\n");
/* FIXME: handle as an error for now */
return -ENODEV;
case GB_SVC_INTF_TYPE_GREYBUS:
*intf_type = GB_INTERFACE_TYPE_GREYBUS;
break;
default:
dev_err(&intf->dev, "unknown interface type: %u\n", type);
*intf_type = GB_INTERFACE_TYPE_UNKNOWN;
return -ENODEV;
}
return 0;
}
static int gb_interface_hibernate_link(struct gb_interface *intf)
{
struct gb_svc *svc = intf->hd->svc;
return gb_svc_intf_set_power_mode_hibernate(svc, intf->interface_id);
}
static int _gb_interface_activate(struct gb_interface *intf,
enum gb_interface_type *type)
{
int ret;
*type = GB_INTERFACE_TYPE_UNKNOWN;
if (intf->ejected || intf->removed)
return -ENODEV;
ret = gb_interface_vsys_set(intf, true);
if (ret)
return ret;
ret = gb_interface_refclk_set(intf, true);
if (ret)
goto err_vsys_disable;
ret = gb_interface_unipro_set(intf, true);
if (ret)
goto err_refclk_disable;
ret = gb_interface_activate_operation(intf, type);
if (ret) {
switch (*type) {
case GB_INTERFACE_TYPE_UNIPRO:
case GB_INTERFACE_TYPE_GREYBUS:
goto err_hibernate_link;
default:
goto err_unipro_disable;
}
}
ret = gb_interface_read_dme(intf);
if (ret)
goto err_hibernate_link;
ret = gb_interface_route_create(intf);
if (ret)
goto err_hibernate_link;
intf->active = true;
trace_gb_interface_activate(intf);
return 0;
err_hibernate_link:
gb_interface_hibernate_link(intf);
err_unipro_disable:
gb_interface_unipro_set(intf, false);
err_refclk_disable:
gb_interface_refclk_set(intf, false);
err_vsys_disable:
gb_interface_vsys_set(intf, false);
return ret;
}
/*
* At present, we assume a UniPro-only module to be a Greybus module that
* failed to send its mailbox poke. There is some reason to believe that this
* is because of a bug in the ES3 bootrom.