From: Li Jun <b47...@freescale.com>

This patch adds sys input to control and show OTG fsm inputs by application,
user can do host and preipheral role switch by change these inputs.

Signed-off-by: Li Jun <b47...@freescale.com>
---
 drivers/usb/chipidea/otg.c     |    2 +
 drivers/usb/chipidea/otg_fsm.c |  173 ++++++++++++++++++++++++++++++++++++++++
 drivers/usb/chipidea/otg_fsm.h |    6 ++
 3 files changed, 181 insertions(+)

diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
index 38e340c..a048b08 100644
--- a/drivers/usb/chipidea/otg.c
+++ b/drivers/usb/chipidea/otg.c
@@ -141,4 +141,6 @@ void ci_hdrc_otg_destroy(struct ci_hdrc *ci)
        /* Disable all OTG irq and clear status */
        hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
                                                OTGSC_INT_STATUS_BITS);
+       if (ci_otg_is_fsm_mode(ci))
+               ci_hdrc_otg_fsm_remove(ci);
 }
diff --git a/drivers/usb/chipidea/otg_fsm.c b/drivers/usb/chipidea/otg_fsm.c
index 67902a1..8d4c33d 100644
--- a/drivers/usb/chipidea/otg_fsm.c
+++ b/drivers/usb/chipidea/otg_fsm.c
@@ -46,6 +46,167 @@ static struct ci_otg_fsm_timer *otg_timer_initializer
        return timer;
 }
 
+/* Add for otg: interact with user space app */
+static ssize_t
+get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       char            *next;
+       unsigned        size, t;
+       struct ci_hdrc  *ci = dev_get_drvdata(dev);
+
+       next = buf;
+       size = PAGE_SIZE;
+       t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_req);
+       size -= t;
+       next += t;
+
+       return PAGE_SIZE - size;
+}
+
+static ssize_t
+set_a_bus_req(struct device *dev, struct device_attribute *attr,
+                                       const char *buf, size_t count)
+{
+       struct ci_hdrc *ci = dev_get_drvdata(dev);
+
+       if (count > 2)
+               return -1;
+
+       mutex_lock(&ci->fsm.lock);
+       if (buf[0] == '0') {
+               ci->fsm.a_bus_req = 0;
+       } else if (buf[0] == '1') {
+               /* If a_bus_drop is TRUE, a_bus_req can't be set */
+               if (ci->fsm.a_bus_drop) {
+                       mutex_unlock(&ci->fsm.lock);
+                       return count;
+               }
+               ci->fsm.a_bus_req = 1;
+       }
+
+       disable_irq_nosync(ci->irq);
+       queue_work(ci->wq, &ci->work);
+       mutex_unlock(&ci->fsm.lock);
+
+       return count;
+}
+static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req, set_a_bus_req);
+
+static ssize_t
+get_a_bus_drop(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       char            *next;
+       unsigned        size, t;
+       struct ci_hdrc  *ci = dev_get_drvdata(dev);
+
+       next = buf;
+       size = PAGE_SIZE;
+       t = scnprintf(next, size, "%d\n", ci->fsm.a_bus_drop);
+       size -= t;
+       next += t;
+
+       return PAGE_SIZE - size;
+}
+
+static ssize_t
+set_a_bus_drop(struct device *dev, struct device_attribute *attr,
+                                       const char *buf, size_t count)
+{
+       struct ci_hdrc  *ci = dev_get_drvdata(dev);
+
+       if (count > 2)
+               return -1;
+
+       mutex_lock(&ci->fsm.lock);
+       if (buf[0] == '0') {
+               ci->fsm.a_bus_drop = 0;
+       } else if (buf[0] == '1') {
+               ci->fsm.a_bus_drop = 1;
+               ci->fsm.a_bus_req = 0;
+       }
+
+       disable_irq_nosync(ci->irq);
+       queue_work(ci->wq, &ci->work);
+       mutex_unlock(&ci->fsm.lock);
+
+       return count;
+}
+static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR, get_a_bus_drop,
+                                               set_a_bus_drop);
+
+static ssize_t
+get_b_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       char            *next;
+       unsigned        size, t;
+       struct ci_hdrc  *ci = dev_get_drvdata(dev);
+
+       next = buf;
+       size = PAGE_SIZE;
+       t = scnprintf(next, size, "%d\n", ci->fsm.b_bus_req);
+       size -= t;
+       next += t;
+
+       return PAGE_SIZE - size;
+}
+
+static ssize_t
+set_b_bus_req(struct device *dev, struct device_attribute *attr,
+                                       const char *buf, size_t count)
+{
+       struct ci_hdrc  *ci = dev_get_drvdata(dev);
+
+       if (count > 2)
+               return -1;
+
+       mutex_lock(&ci->fsm.lock);
+       if (buf[0] == '0')
+               ci->fsm.b_bus_req = 0;
+       else if (buf[0] == '1')
+               ci->fsm.b_bus_req = 1;
+
+       disable_irq_nosync(ci->irq);
+       queue_work(ci->wq, &ci->work);
+       mutex_unlock(&ci->fsm.lock);
+
+       return count;
+}
+static DEVICE_ATTR(b_bus_req, S_IRUGO | S_IWUSR, get_b_bus_req, set_b_bus_req);
+
+static ssize_t
+set_a_clr_err(struct device *dev, struct device_attribute *attr,
+                                       const char *buf, size_t count)
+{
+       struct ci_hdrc  *ci = dev_get_drvdata(dev);
+
+       if (count > 2)
+               return -1;
+
+       mutex_lock(&ci->fsm.lock);
+       if (buf[0] == '1')
+               ci->fsm.a_clr_err = 1;
+
+       disable_irq_nosync(ci->irq);
+       queue_work(ci->wq, &ci->work);
+       mutex_unlock(&ci->fsm.lock);
+
+       return count;
+}
+static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
+
+static struct attribute *inputs_attrs[] = {
+       &dev_attr_a_bus_req.attr,
+       &dev_attr_a_bus_drop.attr,
+       &dev_attr_b_bus_req.attr,
+       &dev_attr_a_clr_err.attr,
+       NULL,
+};
+
+static struct attribute_group inputs_attr_group = {
+       .name = "inputs",
+       .attrs = inputs_attrs,
+};
+
 /*
  * Add timer to active timer list
  */
@@ -676,6 +837,13 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
                return retval;
        }
 
+       retval = sysfs_create_group(&ci->dev->kobj, &inputs_attr_group);
+       if (retval < 0) {
+               dev_dbg(ci->dev,
+                       "Can't register sysfs attr group: %d\n", retval);
+               return retval;
+       }
+
        /* Enable A vbus valid irq */
        hw_write_otgsc(ci, OTGSC_AVVIE, OTGSC_AVVIE);
 
@@ -690,3 +858,8 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci)
 
        return 0;
 }
+
+void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci)
+{
+       sysfs_remove_group(&ci->dev->kobj, &inputs_attr_group);
+}
diff --git a/drivers/usb/chipidea/otg_fsm.h b/drivers/usb/chipidea/otg_fsm.h
index 6ec8247..94c085f 100644
--- a/drivers/usb/chipidea/otg_fsm.h
+++ b/drivers/usb/chipidea/otg_fsm.h
@@ -95,6 +95,7 @@ int ci_hdrc_otg_fsm_init(struct ci_hdrc *ci);
 int ci_otg_fsm_work(struct ci_hdrc *ci);
 irqreturn_t ci_otg_fsm_irq(struct ci_hdrc *ci);
 void ci_hdrc_otg_fsm_start(struct ci_hdrc *ci);
+void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci);
 
 #else
 
@@ -118,6 +119,11 @@ static inline void ci_hdrc_otg_fsm_start(struct ci_hdrc 
*ci)
 
 }
 
+static inline void ci_hdrc_otg_fsm_remove(struct ci_hdrc *ci)
+{
+
+}
+
 #endif
 
 #endif /* __DRIVERS_USB_CHIPIDEA_OTG_FSM_H */
-- 
1.7.9.5

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