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authorAlan Stern <stern@rowland.harvard.edu>2012-10-31 21:12:11 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-31 23:48:07 +0400
commit4968f951913997adc8c68c4e986e8168ee1d2998 (patch)
tree4ab4aa7bff6faf8c533ec5c346d591fdb0ed64b5 /drivers/usb/host/ehci-dbg.c
parent571e41214e988bc38c99d804e6d8e1ea1d016342 (diff)
downloadlinux-4968f951913997adc8c68c4e986e8168ee1d2998.tar.xz
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>
Diffstat (limited to 'drivers/usb/host/ehci-dbg.c')
-rw-r--r--drivers/usb/host/ehci-dbg.c97
1 files changed, 0 insertions, 97 deletions
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index dfd3bf3aa4de..70b496dc18a0 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: