^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * bus driver for ccwgroup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2002, 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author(s): Arnd Bergmann (arndb@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Cornelia Huck (cornelia.huck@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/dcache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/cio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/ccwdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/ccwgroup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "device.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define CCW_BUS_ID_SIZE 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /* In Linux 2.4, we had a channel device layer called "chandev"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * that did all sorts of obscure stuff for networking devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * This is another driver that serves as a replacement for just
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * one of its functions, namely the translation of single subchannels
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * to devices that use multiple subchannels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static struct bus_type ccwgroup_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) char str[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) for (i = 0; i < gdev->count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) sprintf(str, "cdev%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) sysfs_remove_link(&gdev->dev.kobj, str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * Remove references from ccw devices to ccw group device and from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * ccw group device to ccw devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct ccw_device *cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) for (i = 0; i < gdev->count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) cdev = gdev->cdev[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (!cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) spin_lock_irq(cdev->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) dev_set_drvdata(&cdev->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) spin_unlock_irq(cdev->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) gdev->cdev[i] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) put_device(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * ccwgroup_set_online() - enable a ccwgroup device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * @gdev: target ccwgroup device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * This function attempts to put the ccwgroup device into the online state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * %0 on success and a negative error value on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) int ccwgroup_set_online(struct ccwgroup_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (gdev->state == CCWGROUP_ONLINE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (gdrv->set_online)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) ret = gdrv->set_online(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) gdev->state = CCWGROUP_ONLINE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) atomic_set(&gdev->onoff, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) EXPORT_SYMBOL(ccwgroup_set_online);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * ccwgroup_set_offline() - disable a ccwgroup device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * @gdev: target ccwgroup device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * This function attempts to put the ccwgroup device into the offline state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * %0 on success and a negative error value on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int ccwgroup_set_offline(struct ccwgroup_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (gdev->state == CCWGROUP_OFFLINE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (gdrv->set_offline)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ret = gdrv->set_offline(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) gdev->state = CCWGROUP_OFFLINE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) atomic_set(&gdev->onoff, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) EXPORT_SYMBOL(ccwgroup_set_offline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static ssize_t ccwgroup_online_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) unsigned long value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) device_lock(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (!dev->driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ret = kstrtoul(buf, 0, &value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (value == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) ret = ccwgroup_set_online(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) else if (value == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) ret = ccwgroup_set_offline(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) device_unlock(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return (ret == 0) ? count : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) static ssize_t ccwgroup_online_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) int online;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return scnprintf(buf, PAGE_SIZE, "%d\n", online);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * Provide an 'ungroup' attribute so the user can remove group devices no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) * longer needed or accidentially created. Saves memory :)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static void ccwgroup_ungroup(struct ccwgroup_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) mutex_lock(&gdev->reg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (device_is_registered(&gdev->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) __ccwgroup_remove_symlinks(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) device_unregister(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) __ccwgroup_remove_cdev_refs(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) mutex_unlock(&gdev->reg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static ssize_t ccwgroup_ungroup_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) /* Prevent concurrent online/offline processing and ungrouping. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (gdev->state != CCWGROUP_OFFLINE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (device_remove_file_self(dev, attr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) ccwgroup_ungroup(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) rc = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /* Release onoff "lock" when ungrouping failed. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) atomic_set(&gdev->onoff, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static struct attribute *ccwgroup_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) &dev_attr_online.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) &dev_attr_ungroup.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) static struct attribute_group ccwgroup_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) .attrs = ccwgroup_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static const struct attribute_group *ccwgroup_attr_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) &ccwgroup_attr_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static void ccwgroup_ungroup_workfn(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) struct ccwgroup_device *gdev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) container_of(work, struct ccwgroup_device, ungroup_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) ccwgroup_ungroup(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) put_device(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static void ccwgroup_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) kfree(to_ccwgroupdev(dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) char str[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) int i, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) for (i = 0; i < gdev->count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) &gdev->dev.kobj, "group_device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) for (--i; i >= 0; i--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) "group_device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) for (i = 0; i < gdev->count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) sprintf(str, "cdev%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) rc = sysfs_create_link(&gdev->dev.kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) &gdev->cdev[i]->dev.kobj, str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) for (--i; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) sprintf(str, "cdev%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) sysfs_remove_link(&gdev->dev.kobj, str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) for (i = 0; i < gdev->count; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) "group_device");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static int __get_next_id(const char **buf, struct ccw_dev_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) unsigned int cssid, ssid, devno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) int ret = 0, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) char *start, *end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) start = (char *)*buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) end = strchr(start, ',');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (!end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* Last entry. Strip trailing newline, if applicable. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) end = strchr(start, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) if (end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) *end = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) len = strlen(start) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) len = end - start + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) end++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (len <= CCW_BUS_ID_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (sscanf(start, "%2x.%1x.%04x", &cssid, &ssid, &devno) != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) id->ssid = ssid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) id->devno = devno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) *buf = end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * ccwgroup_create_dev() - create and register a ccw group device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * @parent: parent device for the new device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * @gdrv: driver for the new group device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * @num_devices: number of slave devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * @buf: buffer containing comma separated bus ids of slave devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * Create and register a new ccw group device as a child of @parent. Slave
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * devices are obtained from the list of bus ids given in @buf.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) * %0 on success and an error code on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * Context:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * non-atomic
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) int num_devices, const char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) struct ccwgroup_device *gdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct ccw_dev_id dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) int rc, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (num_devices < 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) gdev = kzalloc(struct_size(gdev, cdev, num_devices), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (!gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) atomic_set(&gdev->onoff, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) mutex_init(&gdev->reg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) mutex_lock(&gdev->reg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) INIT_WORK(&gdev->ungroup_work, ccwgroup_ungroup_workfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) gdev->count = num_devices;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) gdev->dev.bus = &ccwgroup_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) gdev->dev.parent = parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) gdev->dev.release = ccwgroup_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) device_initialize(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) for (i = 0; i < num_devices && buf; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) rc = __get_next_id(&buf, &dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (rc != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) gdev->cdev[i] = get_ccwdev_by_dev_id(&dev_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * All devices have to be of the same type in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) * order to be grouped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) if (!gdev->cdev[i] || !gdev->cdev[i]->drv ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) gdev->cdev[i]->drv != gdev->cdev[0]->drv ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) gdev->cdev[i]->id.driver_info !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) gdev->cdev[0]->id.driver_info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) /* Don't allow a device to belong to more than one group. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) spin_lock_irq(gdev->cdev[i]->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (dev_get_drvdata(&gdev->cdev[i]->dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) spin_unlock_irq(gdev->cdev[i]->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) dev_set_drvdata(&gdev->cdev[i]->dev, gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) spin_unlock_irq(gdev->cdev[i]->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) /* Check for sufficient number of bus ids. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (i < num_devices) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) /* Check for trailing stuff. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) if (i == num_devices && buf && strlen(buf) > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /* Check if the devices are bound to the required ccw driver. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) if (gdrv && gdrv->ccw_driver &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) gdev->cdev[0]->drv != gdrv->ccw_driver) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) gdev->dev.groups = ccwgroup_attr_groups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (gdrv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) gdev->dev.driver = &gdrv->driver;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) rc = gdrv->setup ? gdrv->setup(gdev) : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) rc = device_add(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) rc = __ccwgroup_create_symlinks(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) device_del(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) mutex_unlock(&gdev->reg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) for (i = 0; i < num_devices; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) if (gdev->cdev[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) spin_lock_irq(gdev->cdev[i]->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (dev_get_drvdata(&gdev->cdev[i]->dev) == gdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) dev_set_drvdata(&gdev->cdev[i]->dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) spin_unlock_irq(gdev->cdev[i]->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) put_device(&gdev->cdev[i]->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) gdev->cdev[i] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) mutex_unlock(&gdev->reg_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) put_device(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) EXPORT_SYMBOL(ccwgroup_create_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct ccwgroup_device *gdev = to_ccwgroupdev(data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (action == BUS_NOTIFY_UNBIND_DRIVER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) get_device(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) schedule_work(&gdev->ungroup_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) static struct notifier_block ccwgroup_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) .notifier_call = ccwgroup_notifier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) static int __init init_ccwgroup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) ret = bus_register(&ccwgroup_bus_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) ret = bus_register_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) bus_unregister(&ccwgroup_bus_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) static void __exit cleanup_ccwgroup(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) bus_unregister_notifier(&ccwgroup_bus_type, &ccwgroup_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) bus_unregister(&ccwgroup_bus_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) module_init(init_ccwgroup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) module_exit(cleanup_ccwgroup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) /************************** driver stuff ******************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) static int ccwgroup_remove(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (!dev->driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (gdrv->remove)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) gdrv->remove(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) static void ccwgroup_shutdown(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (!dev->driver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (gdrv->shutdown)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) gdrv->shutdown(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) static struct bus_type ccwgroup_bus_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) .name = "ccwgroup",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) .remove = ccwgroup_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) .shutdown = ccwgroup_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) bool dev_is_ccwgroup(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) return dev->bus == &ccwgroup_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) EXPORT_SYMBOL(dev_is_ccwgroup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * ccwgroup_driver_register() - register a ccw group driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * @cdriver: driver to be registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * This function is mainly a wrapper around driver_register().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) /* register our new driver with the core */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) cdriver->driver.bus = &ccwgroup_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return driver_register(&cdriver->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) EXPORT_SYMBOL(ccwgroup_driver_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * ccwgroup_driver_unregister() - deregister a ccw group driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) * @cdriver: driver to be deregistered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) * This function is mainly a wrapper around driver_unregister().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) /* We don't want ccwgroup devices to live longer than their driver. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) while ((dev = driver_find_next_device(&cdriver->driver, NULL))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) ccwgroup_ungroup(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) put_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) driver_unregister(&cdriver->driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) EXPORT_SYMBOL(ccwgroup_driver_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * get_ccwgroupdev_by_busid() - obtain device from a bus id
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * @gdrv: driver the device is owned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * @bus_id: bus id of the device to be searched
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) * This function searches all devices owned by @gdrv for a device with a bus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) * id matching @bus_id.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * If a match is found, its reference count of the found device is increased
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * and it is returned; else %NULL is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) struct ccwgroup_device *get_ccwgroupdev_by_busid(struct ccwgroup_driver *gdrv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) char *bus_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) struct device *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) dev = driver_find_device_by_name(&gdrv->driver, bus_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) return dev ? to_ccwgroupdev(dev) : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) EXPORT_SYMBOL_GPL(get_ccwgroupdev_by_busid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) * ccwgroup_probe_ccwdev() - probe function for slave devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) * @cdev: ccw device to be probed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) * This is a dummy probe function for ccw devices that are slave devices in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) * a ccw group device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) * Returns:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) * always %0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) int ccwgroup_probe_ccwdev(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) EXPORT_SYMBOL(ccwgroup_probe_ccwdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) * ccwgroup_remove_ccwdev() - remove function for slave devices
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) * @cdev: ccw device to be removed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) * This is a remove function for ccw devices that are slave devices in a ccw
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * group device. It sets the ccw device offline and also deregisters the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * embedding ccw group device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) void ccwgroup_remove_ccwdev(struct ccw_device *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) struct ccwgroup_device *gdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) /* Ignore offlining errors, device is gone anyway. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) ccw_device_set_offline(cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) /* If one of its devices is gone, the whole group is done for. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) spin_lock_irq(cdev->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) gdev = dev_get_drvdata(&cdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) if (!gdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) spin_unlock_irq(cdev->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) /* Get ccwgroup device reference for local processing. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) get_device(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) spin_unlock_irq(cdev->ccwlock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) /* Unregister group device. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) ccwgroup_ungroup(gdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) /* Release ccwgroup device reference for local processing. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) put_device(&gdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) EXPORT_SYMBOL(ccwgroup_remove_ccwdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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