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usb: chipidea: core: add sysfs group

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Sometimes, the user needs to adjust some properties for controllers, eg
the role for controller, we add sysfs group for them.

The attribute 'role' is used to switch host/gadget role dynamically, the
uewr can read the current role, and write the other role compare to
current one to finish the switch.

Signed-off-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
This commit is contained in:
Peter Chen 2017-03-27 10:54:27 +08:00 committed by Leonard Crestez
parent c71da1df49
commit 8bcbfab502
3 changed files with 72 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Documentation/ABI/testing/sysfs-platform-chipidea-usb2 Normal file
View File

@ -0,0 +1,9 @@
What: /sys/bus/platform/devices/ci_hdrc.0/role
Date: Mar 2017
Contact: Peter Chen <peter.chen@nxp.com>
Description:
It returns string "gadget" or "host" when read it, it indicates
current controller role.
It will do role switch when write "gadget" or "host" to it.
Only controller at dual-role configuration supports writing.

63
drivers/usb/chipidea/core.c
View File

@ -894,6 +894,56 @@ static void ci_power_lost_work(struct work_struct *work)
enable_irq(ci->irq);
}
static ssize_t ci_role_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", ci_role(ci)->name);
}
static ssize_t ci_role_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t n)
{
struct ci_hdrc *ci = dev_get_drvdata(dev);
enum ci_role role;
int ret;
if (!(ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET])) {
dev_warn(dev, "Current configuration is not dual-role, quit\n");
return -EPERM;
}
for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
if (!strncmp(buf, ci->roles[role]->name,
strlen(ci->roles[role]->name)))
break;
if (role == CI_ROLE_END || role == ci->role)
return -EINVAL;
pm_runtime_get_sync(dev);
disable_irq(ci->irq);
ci_role_stop(ci);
ret = ci_role_start(ci, role);
if (!ret && ci->role == CI_ROLE_GADGET)
ci_handle_vbus_change(ci);
enable_irq(ci->irq);
pm_runtime_put_sync(dev);
return (ret == 0) ? n : ret;
}
static DEVICE_ATTR(role, 0644, ci_role_show, ci_role_store);
static struct attribute *ci_attrs[] = {
&dev_attr_role.attr,
NULL,
};
static struct attribute_group ci_attr_group = {
.attrs = ci_attrs,
};
static int ci_hdrc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -1048,9 +1098,17 @@ static int ci_hdrc_probe(struct platform_device *pdev)
mutex_init(&ci->mutex);
ret = dbg_create_files(ci);
if (!ret)
return 0;
if (ret)
goto stop;
ret = sysfs_create_group(&dev->kobj, &ci_attr_group);
if (ret)
goto remove_debug;
return 0;
remove_debug:
dbg_remove_files(ci);
stop:
if (ci->is_otg && ci->roles[CI_ROLE_GADGET])
ci_hdrc_otg_destroy(ci);
@ -1075,6 +1133,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
}
dbg_remove_files(ci);
sysfs_remove_group(&ci->dev->kobj, &ci_attr_group);
ci_role_destroy(ci);
ci_hdrc_enter_lpm(ci, true);
ci_usb_phy_exit(ci);

2
drivers/usb/chipidea/udc.c
View File

@ -2096,6 +2096,8 @@ static void udc_id_switch_for_host(struct ci_hdrc *ci)
ci->fsm.otg->state == OTG_STATE_B_IDLE ||
ci->fsm.otg->state == OTG_STATE_UNDEFINED)
hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
ci->vbus_active = 0;
}
static void udc_suspend_for_power_lost(struct ci_hdrc *ci)