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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2007 by Alan Stern
*/
/* this file is part of ehci-hcd.c */
/* Display the ports dedicated to the companion controller */
static ssize_t companion_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ehci_hcd *ehci;
int nports, index, n;
int count = PAGE_SIZE;
char *ptr = buf;
ehci = hcd_to_ehci(dev_get_drvdata(dev));
nports = HCS_N_PORTS(ehci->hcs_params);
for (index = 0; index < nports; ++index) {
if (test_bit(index, &ehci->companion_ports)) {
n = scnprintf(ptr, count, "%d\n", index + 1);
ptr += n;
count -= n;
}
}
return ptr - buf;
}
/*
* Dedicate or undedicate a port to the companion controller.
* Syntax is "[-]portnum", where a leading '-' sign means
* return control of the port to the EHCI controller.
*/
static ssize_t companion_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct ehci_hcd *ehci;
int portnum, new_owner;
ehci = hcd_to_ehci(dev_get_drvdata(dev));
new_owner = PORT_OWNER; /* Owned by companion */
if (sscanf(buf, "%d", &portnum) != 1)
return -EINVAL;
if (portnum < 0) {
portnum = - portnum;
new_owner = 0; /* Owned by EHCI */
}
if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
return -ENOENT;
portnum--;
if (new_owner)
set_bit(portnum, &ehci->companion_ports);
else
clear_bit(portnum, &ehci->companion_ports);
set_owner(ehci, portnum, new_owner);
return count;
}
static DEVICE_ATTR_RW(companion);
/*
* Display / Set uframe_periodic_max
*/
static ssize_t uframe_periodic_max_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ehci_hcd *ehci;
int n;
ehci = hcd_to_ehci(dev_get_drvdata(dev));
n = scnprintf(buf, PAGE_SIZE, "%d\n", ehci->uframe_periodic_max);
return n;
}
static ssize_t uframe_periodic_max_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct ehci_hcd *ehci;
unsigned uframe_periodic_max;
unsigned uframe;
unsigned long flags;
ssize_t ret;
ehci = hcd_to_ehci(dev_get_drvdata(dev));
if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
return -EINVAL;
if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
ehci_info(ehci, "rejecting invalid request for "
"uframe_periodic_max=%u\n", uframe_periodic_max);
return -EINVAL;
}
ret = -EINVAL;
/*
* lock, so that our checking does not race with possible periodic
* bandwidth allocation through submitting new urbs.
*/
spin_lock_irqsave (&ehci->lock, flags);
/*
* for request to decrease max periodic bandwidth, we have to check
* to see whether the decrease is possible.
*/
if (uframe_periodic_max < ehci->uframe_periodic_max) {
u8 allocated_max = 0;
for (uframe = 0; uframe < EHCI_BANDWIDTH_SIZE; ++uframe)
allocated_max = max(allocated_max,
ehci->bandwidth[uframe]);
if (allocated_max > uframe_periodic_max) {
ehci_info(ehci,
"cannot decrease uframe_periodic_max because "
"periodic bandwidth is already allocated "
"(%u > %u)\n",
allocated_max, uframe_periodic_max);
goto out_unlock;
}
}
/* increasing is always ok */
ehci_info(ehci, "setting max periodic bandwidth to %u%% "
"(== %u usec/uframe)\n",
100*uframe_periodic_max/125, uframe_periodic_max);
if (uframe_periodic_max != 100)
ehci_warn(ehci, "max periodic bandwidth set is non-standard\n");
ehci->uframe_periodic_max = uframe_periodic_max;
ret = count;
out_unlock:
spin_unlock_irqrestore (&ehci->lock, flags);
return ret;
}
static DEVICE_ATTR_RW(uframe_periodic_max);
static inline int create_sysfs_files(struct ehci_hcd *ehci)
{
struct device *controller = ehci_to_hcd(ehci)->self.controller;
int i = 0;
/* with integrated TT there is no companion! */
if (!ehci_is_TDI(ehci))
i = device_create_file(controller, &dev_attr_companion);
if (i)
goto out;
i = device_create_file(controller, &dev_attr_uframe_periodic_max);
out:
return i;
}
static inline void remove_sysfs_files(struct ehci_hcd *ehci)
{
struct device *controller = ehci_to_hcd(ehci)->self.controller;
/* with integrated TT there is no companion! */
if (!ehci_is_TDI(ehci))
device_remove_file(controller, &dev_attr_companion);
device_remove_file(controller, &dev_attr_uframe_periodic_max);
}
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