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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-04-18 00:46:23 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-04-18 00:46:23 +0200
commitf74c91413ec6140ee0553180c5f56fdd27c22a2e (patch)
tree75ba3f7000ba290dc19b1523b12ab95dc5c7b1ea /drivers/ide
parent50672e5d7486c9ab312432cbe180ac071f1de8e0 (diff)
ide: add warm-plug support for IDE devices (take 2)
* Add 'struct class ide_port_class' ('ide_port' class) and a 'struct device *portdev' ('ide_port' class device) in ide_hwif_t. * Register 'ide_port' class in ide_init() and unregister it in cleanup_module(). * Create ->portdev in ide_register_port () and unregister it in ide_unregister(). * Add "delete_devices" class device attribute for unregistering IDE devices on a port and "scan" one for probing+registering IDE devices on a port. * Add ide_sysfs_register_port() helper for registering "delete_devices" and "scan" attributes with ->portdev. Call it in ide_device_add_all(). * Document IDE warm-plug support in Documentation/ide/warm-plug-howto.txt. v2: * Convert patch from using 'struct class_device' to use 'struct device'. (thanks to Kay Sievers for doing it) Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-probe.c71
-rw-r--r--drivers/ide/ide.c24
2 files changed, 93 insertions, 2 deletions
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 468c4ac4181..510254ab3c9 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -623,7 +623,7 @@ static void hwif_release_dev (struct device *dev)
complete(&hwif->gendev_rel_comp);
}
-static void ide_register_port(ide_hwif_t *hwif)
+static int ide_register_port(ide_hwif_t *hwif)
{
int ret;
@@ -639,9 +639,23 @@ static void ide_register_port(ide_hwif_t *hwif)
}
hwif->gendev.release = hwif_release_dev;
ret = device_register(&hwif->gendev);
- if (ret < 0)
+ if (ret < 0) {
printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
__FUNCTION__, ret);
+ goto out;
+ }
+
+ get_device(&hwif->gendev);
+
+ hwif->portdev = device_create(ide_port_class, &hwif->gendev,
+ MKDEV(0, 0), hwif->name);
+ if (IS_ERR(hwif->portdev)) {
+ ret = PTR_ERR(hwif->portdev);
+ device_unregister(&hwif->gendev);
+ }
+ dev_set_drvdata(hwif->portdev, hwif);
+out:
+ return ret;
}
/**
@@ -1378,6 +1392,58 @@ static void ide_port_cable_detect(ide_hwif_t *hwif)
}
}
+static ssize_t store_delete_devices(struct device *portdev,
+ struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ ide_hwif_t *hwif = dev_get_drvdata(portdev);
+
+ if (strncmp(buf, "1", n))
+ return -EINVAL;
+
+ ide_port_unregister_devices(hwif);
+
+ return n;
+};
+
+static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
+
+static ssize_t store_scan(struct device *portdev,
+ struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ ide_hwif_t *hwif = dev_get_drvdata(portdev);
+
+ if (strncmp(buf, "1", n))
+ return -EINVAL;
+
+ ide_port_unregister_devices(hwif);
+ ide_port_scan(hwif);
+
+ return n;
+};
+
+static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
+
+static struct device_attribute *ide_port_attrs[] = {
+ &dev_attr_delete_devices,
+ &dev_attr_scan,
+ NULL
+};
+
+static int ide_sysfs_register_port(ide_hwif_t *hwif)
+{
+ int i, rc;
+
+ for (i = 0; ide_port_attrs[i]; i++) {
+ rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
+ if (rc)
+ break;
+ }
+
+ return rc;
+}
+
int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
{
ide_hwif_t *hwif, *mate = NULL;
@@ -1474,6 +1540,7 @@ int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
hwif = &ide_hwifs[idx[i]];
if (hwif->present) {
+ ide_sysfs_register_port(hwif);
ide_proc_register_port(hwif);
ide_proc_port_register_devices(hwif);
}
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index cb18ba8de22..d791b1ffb58 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -78,6 +78,8 @@
/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 1
+struct class *ide_port_class;
+
static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
IDE2_MAJOR, IDE3_MAJOR,
IDE4_MAJOR, IDE5_MAJOR,
@@ -591,6 +593,7 @@ void ide_unregister(unsigned int index, int init_default, int restore)
ide_remove_port_from_hwgroup(hwif);
+ device_unregister(hwif->portdev);
device_unregister(&hwif->gendev);
wait_for_completion(&hwif->gendev_rel_comp);
@@ -1590,6 +1593,13 @@ struct bus_type ide_bus_type = {
EXPORT_SYMBOL_GPL(ide_bus_type);
+static void ide_port_class_release(struct device *portdev)
+{
+ ide_hwif_t *hwif = dev_get_drvdata(portdev);
+
+ put_device(&hwif->gendev);
+}
+
/*
* This is gets invoked once during initialization, to set *everything* up
*/
@@ -1610,11 +1620,23 @@ static int __init ide_init(void)
return ret;
}
+ ide_port_class = class_create(THIS_MODULE, "ide_port");
+ if (IS_ERR(ide_port_class)) {
+ ret = PTR_ERR(ide_port_class);
+ goto out_port_class;
+ }
+ ide_port_class->dev_release = ide_port_class_release;
+
init_ide_data();
proc_ide_create();
return 0;
+
+out_port_class:
+ bus_unregister(&ide_bus_type);
+
+ return ret;
}
#ifdef MODULE
@@ -1651,6 +1673,8 @@ void __exit cleanup_module (void)
proc_ide_destroy();
+ class_destroy(ide_port_class);
+
bus_unregister(&ide_bus_type);
}