static ssize_t
group_write(struct device_driver *drv, const char *buf, size_t count)
{
const char *start, *end;
char bus_ids[2][BUS_ID_SIZE], *argv[2];
int i;
int ret;
struct ccwgroup_driver *cdrv;
cdrv = to_ccwgroupdrv(drv);
if (!cdrv)
return -EINVAL;
start = buf;
for (i=0; i<2; i++) {
static const char delim[] = {',', '\n'};
int len;
if (!(end = strchr(start, delim[i])))
return count;
len = min_t(ptrdiff_t, BUS_ID_SIZE, end - start + 1);
strlcpy (bus_ids[i], start, len);
argv[i] = bus_ids[i];
start = end + 1;
}
ret = ccwgroup_create(&cu3088_root_dev, cdrv->driver_id,
&cu3088_driver, 2, argv);
return (ret == 0) ? count : ret;
}
static ssize_t
ccwgroup_online_store (struct device *dev, const char *buf, size_t count)
{
struct ccwgroup_device *gdev;
struct ccwgroup_driver *gdrv;
unsigned int value;
int ret;
gdev = to_ccwgroupdev(dev);
if (!dev->driver)
return count;
gdrv = to_ccwgroupdrv (gdev->dev.driver);
if (!try_module_get(gdrv->owner))
return -EINVAL;
value = simple_strtoul(buf, 0, 0);
ret = count;
if (value == 1)
ccwgroup_set_online(gdev);
else if (value == 0)
ccwgroup_set_offline(gdev);
else
ret = -EINVAL;
module_put(gdrv->owner);
return ret;
}
static ssize_t
ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
struct ccwgroup_device *gdev;
struct ccwgroup_driver *gdrv;
unsigned long value;
int ret;
if (!dev->driver)
return -ENODEV;
gdev = to_ccwgroupdev(dev);
gdrv = to_ccwgroupdrv(dev->driver);
if (!try_module_get(gdrv->owner))
return -EINVAL;
ret = strict_strtoul(buf, 0, &value);
if (ret)
goto out;
if (value == 1)
ret = ccwgroup_set_online(gdev);
else if (value == 0)
ret = ccwgroup_set_offline(gdev);
else
ret = -EINVAL;
out:
module_put(gdrv->owner);
return (ret == 0) ? count : ret;
}
static int
ccwgroup_set_offline(struct ccwgroup_device *gdev)
{
struct ccwgroup_driver *gdrv;
int ret;
if (atomic_compare_and_swap(0, 1, &gdev->onoff))
return -EAGAIN;
if (gdev->state == CCWGROUP_OFFLINE) {
ret = 0;
goto out;
}
if (!gdev->dev.driver) {
ret = -EINVAL;
goto out;
}
gdrv = to_ccwgroupdrv (gdev->dev.driver);
if ((ret = gdrv->set_offline(gdev)))
goto out;
gdev->state = CCWGROUP_OFFLINE;
out:
atomic_set(&gdev->onoff, 0);
return ret;
}
static int ccwgroup_probe(struct device *dev)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
return gdrv->probe ? gdrv->probe(gdev) : -ENODEV;
}
static int
ccwgroup_set_online(struct ccwgroup_device *gdev)
{
struct ccwgroup_driver *gdrv;
int ret;
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
return -EAGAIN;
if (gdev->state == CCWGROUP_ONLINE) {
ret = 0;
goto out;
}
if (!gdev->dev.driver) {
ret = -EINVAL;
goto out;
}
gdrv = to_ccwgroupdrv (gdev->dev.driver);
if ((ret = gdrv->set_online ? gdrv->set_online(gdev) : 0))
goto out;
gdev->state = CCWGROUP_ONLINE;
out:
atomic_set(&gdev->onoff, 0);
return ret;
}
static int ccwgroup_pm_restore(struct device *dev)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
return 0;
return gdrv->restore ? gdrv->restore(gdev) : 0;
}
static void ccwgroup_shutdown(struct device *dev)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
if (!dev->driver)
return;
if (gdrv->shutdown)
gdrv->shutdown(gdev);
}
/* a device matches a driver if all its slave devices match the same
* entry of the driver */
static int ccwgroup_bus_match(struct device *dev, struct device_driver * drv)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(drv);
if (gdev->creator_id == gdrv->driver_id)
return 1;
return 0;
}
static void ccwgroup_pm_complete(struct device *dev)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
return;
if (gdrv->complete)
gdrv->complete(gdev);
}
static int ccwgroup_remove(struct device *dev)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
if (!dev->driver)
return 0;
if (gdrv->remove)
gdrv->remove(gdev);
return 0;
}
static int ccwgroup_pm_prepare(struct device *dev)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
/* Fail while device is being set online/offline. */
if (atomic_read(&gdev->onoff))
return -EAGAIN;
if (!gdev->dev.driver || gdev->state != CCWGROUP_ONLINE)
return 0;
return gdrv->prepare ? gdrv->prepare(gdev) : 0;
}
static int
ccwgroup_remove (struct device *dev)
{
struct ccwgroup_device *gdev;
struct ccwgroup_driver *gdrv;
gdev = to_ccwgroupdev(dev);
gdrv = to_ccwgroupdrv(dev->driver);
device_remove_file(dev, &dev_attr_online);
if (gdrv && gdrv->remove)
gdrv->remove(gdev);
return 0;
}
static int
ccwgroup_remove (struct device *dev)
{
struct ccwgroup_device *gdev;
struct ccwgroup_driver *gdrv;
gdev = to_ccwgroupdev(dev);
gdrv = to_ccwgroupdrv(dev->driver);
pr_debug("%s: device %s\n", __func__, gdev->dev.bus_id);
device_remove_file(dev, &dev_attr_online);
if (gdrv && gdrv->remove)
gdrv->remove(gdev);
return 0;
}
static int ccwgroup_set_offline(struct ccwgroup_device *gdev)
{
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
int ret = 0;
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
return -EAGAIN;
if (gdev->state == CCWGROUP_OFFLINE)
goto out;
if (gdrv->set_offline)
ret = gdrv->set_offline(gdev);
if (ret)
goto out;
gdev->state = CCWGROUP_OFFLINE;
out:
atomic_set(&gdev->onoff, 0);
return ret;
}
static int
ccwgroup_probe (struct device *dev)
{
struct ccwgroup_device *gdev;
struct ccwgroup_driver *gdrv;
int ret;
gdev = to_ccwgroupdev(dev);
gdrv = to_ccwgroupdrv(dev->driver);
if ((ret = device_create_file(dev, &dev_attr_online)))
return ret;
ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV;
if (ret)
device_remove_file(dev, &dev_attr_online);
return ret;
}