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path: root/drivers/usb/host/xhci-debugfs.c
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Diffstat (limited to 'drivers/usb/host/xhci-debugfs.c')
-rw-r--r--drivers/usb/host/xhci-debugfs.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-debugfs.c b/drivers/usb/host/xhci-debugfs.c
index 5851052d4668..cadc01336bf8 100644
--- a/drivers/usb/host/xhci-debugfs.c
+++ b/drivers/usb/host/xhci-debugfs.c
@@ -8,6 +8,7 @@
*/
#include <linux/slab.h>
+#include <linux/uaccess.h>
#include "xhci.h"
#include "xhci-debugfs.h"
@@ -333,6 +334,67 @@ static const struct file_operations xhci_context_fops = {
.release = single_release,
};
+
+
+static int xhci_portsc_show(struct seq_file *s, void *unused)
+{
+ struct xhci_port *port = s->private;
+ u32 portsc;
+
+ portsc = readl(port->addr);
+ seq_printf(s, "%s\n", xhci_decode_portsc(portsc));
+
+ return 0;
+}
+
+static int xhci_port_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, xhci_portsc_show, inode->i_private);
+}
+
+static ssize_t xhci_port_write(struct file *file, const char __user *ubuf,
+ size_t count, loff_t *ppos)
+{
+ struct seq_file *s = file->private_data;
+ struct xhci_port *port = s->private;
+ struct xhci_hcd *xhci = hcd_to_xhci(port->rhub->hcd);
+ char buf[32];
+ u32 portsc;
+ unsigned long flags;
+
+ if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+ return -EFAULT;
+
+ if (!strncmp(buf, "compliance", 10)) {
+ /* If CTC is clear, compliance is enabled by default */
+ if (!HCC2_CTC(xhci->hcc_params2))
+ return count;
+ spin_lock_irqsave(&xhci->lock, flags);
+ /* compliance mode can only be enabled on ports in RxDetect */
+ portsc = readl(port->addr);
+ if ((portsc & PORT_PLS_MASK) != XDEV_RXDETECT) {
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ return -EPERM;
+ }
+ portsc = xhci_port_state_to_neutral(portsc);
+ portsc &= ~PORT_PLS_MASK;
+ portsc |= PORT_LINK_STROBE | XDEV_COMP_MODE;
+ writel(portsc, port->addr);
+ spin_unlock_irqrestore(&xhci->lock, flags);
+ } else {
+ return -EINVAL;
+ }
+ return count;
+}
+
+static const struct file_operations port_fops = {
+ .open = xhci_port_open,
+ .write = xhci_port_write,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static void xhci_debugfs_create_files(struct xhci_hcd *xhci,
struct xhci_file_map *files,
size_t nentries, void *data,
@@ -449,6 +511,27 @@ void xhci_debugfs_remove_slot(struct xhci_hcd *xhci, int slot_id)
dev->debugfs_private = NULL;
}
+static void xhci_debugfs_create_ports(struct xhci_hcd *xhci,
+ struct dentry *parent)
+{
+ unsigned int num_ports;
+ char port_name[8];
+ struct xhci_port *port;
+ struct dentry *dir;
+
+ num_ports = HCS_MAX_PORTS(xhci->hcs_params1);
+
+ parent = debugfs_create_dir("ports", parent);
+
+ while (num_ports--) {
+ scnprintf(port_name, sizeof(port_name), "port%02d",
+ num_ports + 1);
+ dir = debugfs_create_dir(port_name, parent);
+ port = &xhci->hw_ports[num_ports];
+ debugfs_create_file("portsc", 0644, dir, port, &port_fops);
+ }
+}
+
void xhci_debugfs_init(struct xhci_hcd *xhci)
{
struct device *dev = xhci_to_hcd(xhci)->self.controller;
@@ -497,6 +580,8 @@ void xhci_debugfs_init(struct xhci_hcd *xhci)
xhci->debugfs_root);
xhci->debugfs_slots = debugfs_create_dir("devices", xhci->debugfs_root);
+
+ xhci_debugfs_create_ports(xhci, xhci->debugfs_root);
}
void xhci_debugfs_exit(struct xhci_hcd *xhci)