USB: EHCI: remove unused Link Power Management code

This patch (as1622) removes the USB-2.1 Link Power Management code
from the ehci-hcd driver.  This code was never integrated with
usbcore, it is full of bugs, and it was not getting used by anybody.

However, the debugging code for dumping the LPM-related fields in the
EHCI registers is left in place.  In theory it might be useful to see
these values, even though we don't use them.

This essentially amounts to a partial revert of commit
aa4d8342988d0c1a79ff19b2ede1e81dfbb16ea5 (USB: EHCI: EHCI 1.1
addendum: preparation) and an almost full revert of commit
48f24970144479c29b8cee6d2e1dbedf6dcf9cfb (USB: EHCI: EHCI 1.1
addendum: Basic LPM feature support) plus its follow-ons.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 97 deletions

diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index dfd3bf3..70b496d 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -337,11 +337,6 @@ static int debug_async_open(struct inode *, struct file *);
 static int debug_periodic_open(struct inode *, struct file *);
 static int debug_registers_open(struct inode *, struct file *);
 static int debug_async_open(struct inode *, struct file *);
-static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
-				   size_t count, loff_t *ppos);
-static ssize_t debug_lpm_write(struct file *file, const char __user *buffer,
-			      size_t count, loff_t *ppos);
-static int debug_lpm_close(struct inode *inode, struct file *file);
 
 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
 static int debug_close(struct inode *, struct file *);
@@ -367,14 +362,6 @@ static const struct file_operations debug_registers_fops = {
 	.release	= debug_close,
 	.llseek		= default_llseek,
 };
-static const struct file_operations debug_lpm_fops = {
-	.owner		= THIS_MODULE,
-	.open		= simple_open,
-	.read		= debug_lpm_read,
-	.write		= debug_lpm_write,
-	.release	= debug_lpm_close,
-	.llseek		= noop_llseek,
-};
 
 static struct dentry *ehci_debug_root;
 
@@ -956,86 +943,6 @@ static int debug_registers_open(struct inode *inode, struct file *file)
 	return file->private_data ? 0 : -ENOMEM;
 }
 
-static int debug_lpm_close(struct inode *inode, struct file *file)
-{
-	return 0;
-}
-
-static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
-				   size_t count, loff_t *ppos)
-{
-	/* TODO: show lpm stats */
-	return 0;
-}
-
-static ssize_t debug_lpm_write(struct file *file, const char __user *user_buf,
-			      size_t count, loff_t *ppos)
-{
-	struct usb_hcd		*hcd;
-	struct ehci_hcd		*ehci;
-	char buf[50];
-	size_t len;
-	u32 temp;
-	unsigned long port;
-	u32 __iomem	*portsc ;
-	u32 params;
-
-	hcd = bus_to_hcd(file->private_data);
-	ehci = hcd_to_ehci(hcd);
-
-	len = min(count, sizeof(buf) - 1);
-	if (copy_from_user(buf, user_buf, len))
-		return -EFAULT;
-	buf[len] = '\0';
-	if (len > 0 && buf[len - 1] == '\n')
-		buf[len - 1] = '\0';
-
-	if (strncmp(buf, "enable", 5) == 0) {
-		if (strict_strtoul(buf + 7, 10, &port))
-			return -EINVAL;
-		params = ehci_readl(ehci, &ehci->caps->hcs_params);
-		if (port > HCS_N_PORTS(params)) {
-			ehci_dbg(ehci, "ERR: LPM on bad port %lu\n", port);
-			return -ENODEV;
-		}
-		portsc = &ehci->regs->port_status[port-1];
-		temp = ehci_readl(ehci, portsc);
-		if (!(temp & PORT_DEV_ADDR)) {
-			ehci_dbg(ehci, "LPM: no device attached\n");
-			return -ENODEV;
-		}
-		temp |= PORT_LPM;
-		ehci_writel(ehci, temp, portsc);
-		printk(KERN_INFO "force enable LPM for port %lu\n", port);
-	} else if (strncmp(buf, "hird=", 5) == 0) {
-		unsigned long hird;
-		if (strict_strtoul(buf + 5, 16, &hird))
-			return -EINVAL;
-		printk(KERN_INFO "setting hird %s %lu\n", buf + 6, hird);
-		ehci->command = (ehci->command & ~CMD_HIRD) | (hird << 24);
-		ehci_writel(ehci, ehci->command, &ehci->regs->command);
-	} else if (strncmp(buf, "disable", 7) == 0) {
-		if (strict_strtoul(buf + 8, 10, &port))
-			return -EINVAL;
-		params = ehci_readl(ehci, &ehci->caps->hcs_params);
-		if (port > HCS_N_PORTS(params)) {
-			ehci_dbg(ehci, "ERR: LPM off bad port %lu\n", port);
-			return -ENODEV;
-		}
-		portsc = &ehci->regs->port_status[port-1];
-		temp = ehci_readl(ehci, portsc);
-		if (!(temp & PORT_DEV_ADDR)) {
-			ehci_dbg(ehci, "ERR: no device attached\n");
-			return -ENODEV;
-		}
-		temp &= ~PORT_LPM;
-		ehci_writel(ehci, temp, portsc);
-		printk(KERN_INFO "disabled LPM for port %lu\n", port);
-	} else
-		return -EOPNOTSUPP;
-	return count;
-}
-
 static inline void create_debug_files (struct ehci_hcd *ehci)
 {
 	struct usb_bus *bus = &ehci_to_hcd(ehci)->self;
@@ -1056,10 +963,6 @@ static inline void create_debug_files (struct ehci_hcd *ehci)
 						    &debug_registers_fops))
 		goto file_error;
 
-	if (!debugfs_create_file("lpm", S_IRUGO|S_IWUSR, ehci->debug_dir, bus,
-						    &debug_lpm_fops))
-		goto file_error;
-
 	return;
 
 file_error: