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path: root/drivers/s390/cio/ccwgroup.c
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Diffstat (limited to 'drivers/s390/cio/ccwgroup.c')
-rw-r--r--drivers/s390/cio/ccwgroup.c112
1 files changed, 43 insertions, 69 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 5f1dc6fb5708..731470e68493 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -1,7 +1,7 @@
/*
* bus driver for ccwgroup
*
- * Copyright IBM Corp. 2002, 2009
+ * Copyright IBM Corp. 2002, 2012
*
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
@@ -15,10 +15,13 @@
#include <linux/ctype.h>
#include <linux/dcache.h>
+#include <asm/cio.h>
#include <asm/ccwdev.h>
#include <asm/ccwgroup.h>
-#define CCW_BUS_ID_SIZE 20
+#include "device.h"
+
+#define CCW_BUS_ID_SIZE 10
/* In Linux 2.4, we had a channel device layer called "chandev"
* that did all sorts of obscure stuff for networking devices.
@@ -27,19 +30,6 @@
* to devices that use multiple subchannels.
*/
-/* 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 struct bus_type ccwgroup_bus_type;
static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
@@ -254,9 +244,10 @@ static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
return 0;
}
-static int __get_next_bus_id(const char **buf, char *bus_id)
+static int __get_next_id(const char **buf, struct ccw_dev_id *id)
{
- int rc, len;
+ unsigned int cssid, ssid, devno;
+ int ret = 0, len;
char *start, *end;
start = (char *)*buf;
@@ -271,49 +262,40 @@ static int __get_next_bus_id(const char **buf, char *bus_id)
len = end - start + 1;
end++;
}
- if (len < CCW_BUS_ID_SIZE) {
- strlcpy(bus_id, start, len);
- rc = 0;
+ if (len <= CCW_BUS_ID_SIZE) {
+ if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3)
+ ret = -EINVAL;
} else
- rc = -EINVAL;
- *buf = end;
- return rc;
-}
-
-static int __is_valid_bus_id(char bus_id[CCW_BUS_ID_SIZE])
-{
- int cssid, ssid, devno;
+ ret = -EINVAL;
- /* Must be of form %x.%x.%04x */
- if (sscanf(bus_id, "%x.%1x.%04x", &cssid, &ssid, &devno) != 3)
- return 0;
- return 1;
+ if (!ret) {
+ id->ssid = ssid;
+ id->devno = devno;
+ }
+ *buf = end;
+ return ret;
}
/**
- * ccwgroup_create_from_string() - create and register a ccw group device
- * @root: parent device for the new device
- * @creator_id: identifier of creating driver
- * @cdrv: ccw driver of slave devices
+ * ccwgroup_create_dev() - create and register a ccw group device
+ * @parent: parent device for the new device
+ * @gdrv: driver for the new group device
* @num_devices: number of slave devices
* @buf: buffer containing comma separated bus ids of slave devices
*
- * Create and register a new ccw group device as a child of @root. Slave
- * devices are obtained from the list of bus ids given in @buf and must all
- * belong to @cdrv.
+ * Create and register a new ccw group device as a child of @parent. Slave
+ * devices are obtained from the list of bus ids given in @buf.
* Returns:
* %0 on success and an error code on failure.
* Context:
* non-atomic
*/
-int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
- struct ccw_driver *cdrv, int num_devices,
- const char *buf)
+int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
+ int num_devices, const char *buf)
{
struct ccwgroup_device *gdev;
+ struct ccw_dev_id dev_id;
int rc, i;
- char tmp_bus_id[CCW_BUS_ID_SIZE];
- const char *curr_buf;
gdev = kzalloc(sizeof(*gdev) + num_devices * sizeof(gdev->cdev[0]),
GFP_KERNEL);
@@ -323,29 +305,24 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
atomic_set(&gdev->onoff, 0);
mutex_init(&gdev->reg_mutex);
mutex_lock(&gdev->reg_mutex);
- gdev->creator_id = creator_id;
gdev->count = num_devices;
gdev->dev.bus = &ccwgroup_bus_type;
- gdev->dev.parent = root;
+ gdev->dev.parent = parent;
gdev->dev.release = ccwgroup_release;
device_initialize(&gdev->dev);
- curr_buf = buf;
- for (i = 0; i < num_devices && curr_buf; i++) {
- rc = __get_next_bus_id(&curr_buf, tmp_bus_id);
+ for (i = 0; i < num_devices && buf; i++) {
+ rc = __get_next_id(&buf, &dev_id);
if (rc != 0)
goto error;
- if (!__is_valid_bus_id(tmp_bus_id)) {
- rc = -EINVAL;
- goto error;
- }
- gdev->cdev[i] = get_ccwdev_by_busid(cdrv, tmp_bus_id);
+ gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id);
/*
* All devices have to be of the same type in
* order to be grouped.
*/
- if (!gdev->cdev[i]
- || gdev->cdev[i]->id.driver_info !=
+ if (!gdev->cdev[i] || !gdev->cdev[i]->drv ||
+ gdev->cdev[i]->drv != gdev->cdev[0]->drv ||
+ gdev->cdev[i]->id.driver_info !=
gdev->cdev[0]->id.driver_info) {
rc = -EINVAL;
goto error;
@@ -361,18 +338,25 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
spin_unlock_irq(gdev->cdev[i]->ccwlock);
}
/* Check for sufficient number of bus ids. */
- if (i < num_devices && !curr_buf) {
+ if (i < num_devices) {
rc = -EINVAL;
goto error;
}
/* Check for trailing stuff. */
- if (i == num_devices && strlen(curr_buf) > 0) {
+ if (i == num_devices && strlen(buf) > 0) {
rc = -EINVAL;
goto error;
}
dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev));
gdev->dev.groups = ccwgroup_attr_groups;
+
+ if (gdrv) {
+ gdev->dev.driver = &gdrv->driver;
+ rc = gdrv->setup ? gdrv->setup(gdev) : 0;
+ if (rc)
+ goto error;
+ }
rc = device_add(&gdev->dev);
if (rc)
goto error;
@@ -397,7 +381,7 @@ error:
put_device(&gdev->dev);
return rc;
}
-EXPORT_SYMBOL(ccwgroup_create_from_string);
+EXPORT_SYMBOL(ccwgroup_create_dev);
static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
void *data)
@@ -440,14 +424,6 @@ module_exit(cleanup_ccwgroup);
/************************** driver stuff ******************************/
-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_remove(struct device *dev)
{
struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
@@ -542,8 +518,6 @@ static const struct dev_pm_ops ccwgroup_pm_ops = {
static struct bus_type ccwgroup_bus_type = {
.name = "ccwgroup",
- .match = ccwgroup_bus_match,
- .probe = ccwgroup_probe,
.remove = ccwgroup_remove,
.shutdown = ccwgroup_shutdown,
.pm = &ccwgroup_pm_ops,
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