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grub/grub-core/bus/usb/usbhub.c

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/* usb.c - USB Hub Support. */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/mm.h>
#include <grub/usb.h>
#include <grub/misc.h>
#include <grub/time.h>
#define GRUB_USBHUB_MAX_DEVICES 128
/* USB Supports 127 devices, with device 0 as special case. */
static struct grub_usb_device *grub_usb_devs[GRUB_USBHUB_MAX_DEVICES];
static int rescan = 0;
struct grub_usb_hub
{
struct grub_usb_hub *next;
grub_usb_controller_t controller;
int nports;
struct grub_usb_device **devices;
grub_usb_device_t dev;
};
static struct grub_usb_hub *hubs;
/* Add a device that currently has device number 0 and resides on
CONTROLLER, the Hub reported that the device speed is SPEED. */
static grub_usb_device_t
grub_usb_hub_add_dev (grub_usb_controller_t controller, grub_usb_speed_t speed)
{
grub_usb_device_t dev;
int i;
grub_usb_err_t err;
dev = grub_zalloc (sizeof (struct grub_usb_device));
if (! dev)
return NULL;
dev->controller = *controller;
dev->speed = speed;
err = grub_usb_device_initialize (dev);
if (err)
{
grub_free (dev);
return NULL;
}
/* Assign a new address to the device. */
for (i = 1; i < GRUB_USBHUB_MAX_DEVICES; i++)
{
if (! grub_usb_devs[i])
break;
}
if (i == GRUB_USBHUB_MAX_DEVICES)
{
grub_error (GRUB_ERR_IO, "can't assign address to USB device");
for (i = 0; i < 8; i++)
grub_free (dev->config[i].descconf);
grub_free (dev);
return NULL;
}
err = grub_usb_control_msg (dev,
(GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_STANDARD
| GRUB_USB_REQTYPE_TARGET_DEV),
GRUB_USB_REQ_SET_ADDRESS,
i, 0, 0, NULL);
if (err)
{
for (i = 0; i < 8; i++)
grub_free (dev->config[i].descconf);
grub_free (dev);
return NULL;
}
dev->addr = i;
dev->initialized = 1;
grub_usb_devs[i] = dev;
/* Wait "recovery interval", spec. says 2ms */
grub_millisleep (2);
grub_usb_device_attach (dev);
return dev;
}
static grub_usb_err_t
grub_usb_add_hub (grub_usb_device_t dev)
{
struct grub_usb_usb_hubdesc hubdesc;
grub_usb_err_t err;
int i;
err = grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_IN
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_DEV),
GRUB_USB_REQ_GET_DESCRIPTOR,
(GRUB_USB_DESCRIPTOR_HUB << 8) | 0,
0, sizeof (hubdesc), (char *) &hubdesc);
if (err)
return err;
grub_dprintf ("usb", "Hub descriptor:\n\t\t len:%d, typ:0x%02x, cnt:%d, char:0x%02x, pwg:%d, curr:%d\n",
hubdesc.length, hubdesc.type, hubdesc.portcnt,
hubdesc.characteristics, hubdesc.pwdgood,
hubdesc.current);
/* Activate the first configuration. Hubs should have only one conf. */
grub_dprintf ("usb", "Hub set configuration\n");
grub_usb_set_configuration (dev, 1);
dev->children = grub_zalloc (hubdesc.portcnt * sizeof (dev->children[0]));
if (!dev->children)
return GRUB_USB_ERR_INTERNAL;
dev->nports = hubdesc.portcnt;
/* Power on all Hub ports. */
for (i = 1; i <= hubdesc.portcnt; i++)
{
grub_dprintf ("usb", "Power on - port %d\n", i);
/* Power on the port and wait for possible device connect */
grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_SET_FEATURE,
GRUB_USB_HUB_FEATURE_PORT_POWER,
i, 0, NULL);
}
/* Rest will be done on next usb poll. */
for (i = 0; i < dev->config[0].interf[0].descif->endpointcnt;
i++)
{
struct grub_usb_desc_endp *endp = NULL;
endp = &dev->config[0].interf[0].descendp[i];
if ((endp->endp_addr & 128) && grub_usb_get_ep_type(endp)
== GRUB_USB_EP_INTERRUPT)
{
dev->hub_endpoint = endp;
dev->hub_transfer
= grub_usb_bulk_read_background (dev, endp->endp_addr,
grub_min (endp->maxpacket,
sizeof (dev->statuschange)),
(char *) &dev->statuschange);
break;
}
}
rescan = 1;
return GRUB_ERR_NONE;
}
static void
attach_root_port (struct grub_usb_hub *hub, int portno,
grub_usb_speed_t speed)
{
grub_usb_device_t dev;
grub_err_t err;
int total, i;
grub_usb_speed_t current_speed = GRUB_USB_SPEED_NONE;
int changed=0;
#if 0
/* Specification does not say about disabling of port when device
* connected. If disabling is really necessary for some devices,
* delete this #if 0 and related #endif */
/* Disable the port. XXX: Why? */
err = hub->controller->dev->portstatus (hub->controller, portno, 0);
if (err)
return;
#endif
/* Wait for completion of insertion and stable power (USB spec.)
* Should be at least 100ms, some devices requires more...
* There is also another thing - some devices have worse contacts
* and connected signal is unstable for some time - we should handle
* it - but prevent deadlock in case when device is too faulty... */
for (total = i = 0; (i < 250) && (total < 2000); i++, total++)
{
grub_millisleep (1);
current_speed = hub->controller->dev->detect_dev
(hub->controller, portno, &changed);
if (current_speed == GRUB_USB_SPEED_NONE)
i = 0;
}
grub_dprintf ("usb", "total=%d\n", total);
if (total >= 2000)
return;
/* Enable the port. */
err = hub->controller->dev->portstatus (hub->controller, portno, 1);
if (err)
return;
hub->controller->dev->pending_reset = grub_get_time_ms () + 5000;
grub_millisleep (10);
/* Enable the port and create a device. */
dev = grub_usb_hub_add_dev (hub->controller, speed);
hub->controller->dev->pending_reset = 0;
if (! dev)
return;
hub->devices[portno] = dev;
/* If the device is a Hub, scan it for more devices. */
if (dev->descdev.class == 0x09)
grub_usb_add_hub (dev);
}
grub_usb_err_t
grub_usb_root_hub (grub_usb_controller_t controller)
{
int i;
struct grub_usb_hub *hub;
int changed=0;
hub = grub_malloc (sizeof (*hub));
if (!hub)
return GRUB_USB_ERR_INTERNAL;
hub->next = hubs;
hubs = hub;
hub->controller = grub_malloc (sizeof (*controller));
if (!hub->controller)
{
grub_free (hub);
return GRUB_USB_ERR_INTERNAL;
}
grub_memcpy (hub->controller, controller, sizeof (*controller));
hub->dev = 0;
/* Query the number of ports the root Hub has. */
hub->nports = controller->dev->hubports (controller);
hub->devices = grub_zalloc (sizeof (hub->devices[0]) * hub->nports);
if (!hub->devices)
{
grub_free (hub->controller);
grub_free (hub);
return GRUB_USB_ERR_INTERNAL;
}
for (i = 0; i < hub->nports; i++)
{
grub_usb_speed_t speed;
if (!controller->dev->pending_reset)
{
speed = controller->dev->detect_dev (hub->controller, i,
&changed);
if (speed != GRUB_USB_SPEED_NONE)
attach_root_port (hub, i, speed);
}
}
return GRUB_USB_ERR_NONE;
}
static void detach_device (grub_usb_device_t dev);
static void
detach_device (grub_usb_device_t dev)
{
unsigned i;
int k;
if (!dev)
return;
if (dev->descdev.class == GRUB_USB_CLASS_HUB)
{
if (dev->hub_transfer)
grub_usb_cancel_transfer (dev->hub_transfer);
for (i = 0; i < dev->nports; i++)
detach_device (dev->children[i]);
grub_free (dev->children);
}
for (i = 0; i < ARRAY_SIZE (dev->config); i++)
if (dev->config[i].descconf)
for (k = 0; k < dev->config[i].descconf->numif; k++)
{
struct grub_usb_interface *inter = &dev->config[i].interf[k];
if (inter && inter->detach_hook)
inter->detach_hook (dev, i, k);
}
grub_usb_devs[dev->addr] = 0;
}
static void
poll_nonroot_hub (grub_usb_device_t dev)
{
grub_usb_err_t err;
unsigned i;
grub_uint8_t changed;
grub_size_t actual;
int j, total;
if (!dev->hub_transfer)
return;
err = grub_usb_check_transfer (dev->hub_transfer, &actual);
if (err == GRUB_USB_ERR_WAIT)
return;
changed = dev->statuschange;
dev->hub_transfer
= grub_usb_bulk_read_background (dev, dev->hub_endpoint->endp_addr,
grub_min (dev->hub_endpoint->maxpacket,
sizeof (dev->statuschange)),
(char *) &dev->statuschange);
if (err || actual == 0 || changed == 0)
return;
/* Iterate over the Hub ports. */
for (i = 1; i <= dev->nports; i++)
{
grub_uint32_t status;
grub_uint32_t current_status = 0;
if (!(changed & (1 << i)))
continue;
/* Get the port status. */
err = grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_IN
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_GET_STATUS,
0, i, sizeof (status), (char *) &status);
grub_dprintf ("usb", "dev = %p, i = %d, status = %08x\n",
dev, i, status);
if (err)
continue;
/* FIXME: properly handle these conditions. */
if (status & GRUB_USB_HUB_STATUS_C_PORT_ENABLED)
grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_CLEAR_FEATURE,
GRUB_USB_HUB_FEATURE_C_PORT_ENABLED, i, 0, 0);
if (status & GRUB_USB_HUB_STATUS_C_PORT_SUSPEND)
grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_CLEAR_FEATURE,
GRUB_USB_HUB_FEATURE_C_PORT_SUSPEND, i, 0, 0);
if (status & GRUB_USB_HUB_STATUS_C_PORT_OVERCURRENT)
grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_CLEAR_FEATURE,
GRUB_USB_HUB_FEATURE_C_PORT_OVERCURRENT, i, 0, 0);
if (!dev->controller.dev->pending_reset &&
(status & GRUB_USB_HUB_STATUS_C_PORT_CONNECTED))
{
grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_CLEAR_FEATURE,
GRUB_USB_HUB_FEATURE_C_PORT_CONNECTED, i, 0, 0);
detach_device (dev->children[i - 1]);
dev->children[i - 1] = NULL;
/* Connected and status of connection changed ? */
if (status & GRUB_USB_HUB_STATUS_PORT_CONNECTED)
{
/* A device is actually connected to this port. */
/* Wait for completion of insertion and stable power (USB spec.)
* Should be at least 100ms, some devices requires more...
* There is also another thing - some devices have worse contacts
* and connected signal is unstable for some time - we should handle
* it - but prevent deadlock in case when device is too faulty... */
for (total = j = 0; (j < 250) && (total < 2000); j++, total++)
{
grub_millisleep (1);
/* Get the port status. */
err = grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_IN
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_GET_STATUS,
0, i,
sizeof (current_status),
(char *) &current_status);
if (err)
{
total = 2000;
break;
}
if (!(current_status & GRUB_USB_HUB_STATUS_PORT_CONNECTED))
j = 0;
}
grub_dprintf ("usb", "(non-root) total=%d\n", total);
if (total >= 2000)
continue;
/* Now do reset of port. */
grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_SET_FEATURE,
GRUB_USB_HUB_FEATURE_PORT_RESET,
i, 0, 0);
rescan = 1;
/* We cannot reset more than one device at the same time !
* Resetting more devices together results in very bad
* situation: more than one device has default address 0
* at the same time !!!
* Additionaly, we cannot perform another reset
* anywhere on the same OHCI controller until
* we will finish addressing of reseted device ! */
dev->controller.dev->pending_reset = grub_get_time_ms () + 5000;
return;
}
}
if (status & GRUB_USB_HUB_STATUS_C_PORT_RESET)
{
grub_usb_control_msg (dev, (GRUB_USB_REQTYPE_OUT
| GRUB_USB_REQTYPE_CLASS
| GRUB_USB_REQTYPE_TARGET_OTHER),
GRUB_USB_REQ_CLEAR_FEATURE,
GRUB_USB_HUB_FEATURE_C_PORT_RESET, i, 0, 0);
if (status & GRUB_USB_HUB_STATUS_PORT_CONNECTED)
{
grub_usb_speed_t speed;
grub_usb_device_t next_dev;
/* Determine the device speed. */
if (status & GRUB_USB_HUB_STATUS_PORT_LOWSPEED)
speed = GRUB_USB_SPEED_LOW;
else
{
if (status & GRUB_USB_HUB_STATUS_PORT_HIGHSPEED)
speed = GRUB_USB_SPEED_HIGH;
else
speed = GRUB_USB_SPEED_FULL;
}
/* Wait a recovery time after reset, spec. says 10ms */
grub_millisleep (10);
/* Add the device and assign a device address to it. */
next_dev = grub_usb_hub_add_dev (&dev->controller, speed);
dev->controller.dev->pending_reset = 0;
if (! next_dev)
continue;
dev->children[i - 1] = next_dev;
/* If the device is a Hub, scan it for more devices. */
if (next_dev->descdev.class == 0x09)
grub_usb_add_hub (next_dev);
}
}
}
}
void
grub_usb_poll_devices (void)
{
struct grub_usb_hub *hub;
int i;
for (hub = hubs; hub; hub = hub->next)
{
/* Do we have to recheck number of ports? */
/* No, it should be never changed, it should be constant. */
for (i = 0; i < hub->nports; i++)
{
grub_usb_speed_t speed = GRUB_USB_SPEED_NONE;
int changed = 0;
if (!hub->controller->dev->pending_reset)
{
/* Check for possible timeout */
if (grub_get_time_ms () > hub->controller->dev->pending_reset)
{
/* Something went wrong, reset device was not
* addressed properly, timeout happened */
hub->controller->dev->pending_reset = 0;
speed = hub->controller->dev->detect_dev (hub->controller,
i, &changed);
}
}
if (changed)
{
detach_device (hub->devices[i]);
hub->devices[i] = NULL;
if (speed != GRUB_USB_SPEED_NONE)
attach_root_port (hub, i, speed);
}
}
}
while (1)
{
rescan = 0;
/* We should check changes of non-root hubs too. */
for (i = 0; i < GRUB_USBHUB_MAX_DEVICES; i++)
{
grub_usb_device_t dev = grub_usb_devs[i];
if (dev && dev->descdev.class == 0x09)
poll_nonroot_hub (dev);
}
if (!rescan)
break;
grub_millisleep (50);
}
}
int
grub_usb_iterate (int (*hook) (grub_usb_device_t dev))
{
int i;
for (i = 0; i < GRUB_USBHUB_MAX_DEVICES; i++)
{
if (grub_usb_devs[i])
{
if (hook (grub_usb_devs[i]))
return 1;
}
}
return 0;
}
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