usb: chipidea: move role to debugfs

Manual role switching function is there for debugging purposes, so has
to move to debugfs.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 057ae09025bf..5738079734e3 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -199,6 +199,55 @@ static const struct file_operations ci_requests_fops = {
         .release        = single_release,
 };
 
+static int ci_role_show(struct seq_file *s, void *data)
+{
+        struct ci13xxx *ci = s->private;
+
+        seq_printf(s, "%s\n", ci_role(ci)->name);
+
+        return 0;
+}
+
+static ssize_t ci_role_write(struct file *file, const char __user *ubuf,
+                             size_t count, loff_t *ppos)
+{
+        struct seq_file *s = file->private_data;
+        struct ci13xxx *ci = s->private;
+        enum ci_role role;
+        char buf[8];
+        int ret;
+
+        if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+                return -EFAULT;
+
+        for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
+                if (ci->roles[role] &&
+                    !strncmp(buf, ci->roles[role]->name,
+                             strlen(ci->roles[role]->name)))
+                        break;
+
+        if (role == CI_ROLE_END || role == ci->role)
+                return -EINVAL;
+
+        ci_role_stop(ci);
+        ret = ci_role_start(ci, role);
+
+        return ret ? ret : count;
+}
+
+static int ci_role_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, ci_role_show, inode->i_private);
+}
+
+static const struct file_operations ci_role_fops = {
+        .open           = ci_role_open,
+        .write          = ci_role_write,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 /**
  * dbg_create_files: initializes the attribute interface
  * @ci: device
@@ -230,6 +279,11 @@ int dbg_create_files(struct ci13xxx *ci)
 
         dent = debugfs_create_file("requests", S_IRUGO, ci->debugfs, ci,
                                    &ci_requests_fops);
+        if (!dent)
+                goto err;
+
+        dent = debugfs_create_file("role", S_IRUGO | S_IWUSR, ci->debugfs, ci,
+                                   &ci_role_fops);
         if (dent)
                 return 0;
 err: