1beafc54cSHans J. Koch /* 2beafc54cSHans J. Koch * drivers/uio/uio.c 3beafc54cSHans J. Koch * 4beafc54cSHans J. Koch * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de> 5beafc54cSHans J. Koch * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> 6318af55dSHans J. Koch * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de> 7beafc54cSHans J. Koch * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com> 8beafc54cSHans J. Koch * 9beafc54cSHans J. Koch * Userspace IO 10beafc54cSHans J. Koch * 11beafc54cSHans J. Koch * Base Functions 12beafc54cSHans J. Koch * 13beafc54cSHans J. Koch * Licensed under the GPLv2 only. 14beafc54cSHans J. Koch */ 15beafc54cSHans J. Koch 16beafc54cSHans J. Koch #include <linux/module.h> 17beafc54cSHans J. Koch #include <linux/init.h> 18beafc54cSHans J. Koch #include <linux/poll.h> 19beafc54cSHans J. Koch #include <linux/device.h> 205a0e3ad6STejun Heo #include <linux/slab.h> 21beafc54cSHans J. Koch #include <linux/mm.h> 22beafc54cSHans J. Koch #include <linux/idr.h> 23d43c36dcSAlexey Dobriyan #include <linux/sched.h> 24beafc54cSHans J. Koch #include <linux/string.h> 25beafc54cSHans J. Koch #include <linux/kobject.h> 2691960a46SEric W. Biederman #include <linux/cdev.h> 27beafc54cSHans J. Koch #include <linux/uio_driver.h> 28beafc54cSHans J. Koch 2991960a46SEric W. Biederman #define UIO_MAX_DEVICES (1U << MINORBITS) 30beafc54cSHans J. Koch 31beafc54cSHans J. Koch struct uio_device { 32beafc54cSHans J. Koch struct module *owner; 33beafc54cSHans J. Koch struct device *dev; 34beafc54cSHans J. Koch int minor; 35beafc54cSHans J. Koch atomic_t event; 36beafc54cSHans J. Koch struct fasync_struct *async_queue; 37beafc54cSHans J. Koch wait_queue_head_t wait; 38beafc54cSHans J. Koch struct uio_info *info; 3981e7c6a6SGreg Kroah-Hartman struct kobject *map_dir; 40e70c412eSHans J. Koch struct kobject *portio_dir; 41beafc54cSHans J. Koch }; 42beafc54cSHans J. Koch 43beafc54cSHans J. Koch static int uio_major; 4491960a46SEric W. Biederman static struct cdev *uio_cdev; 45beafc54cSHans J. Koch static DEFINE_IDR(uio_idr); 464f014691SJan Engelhardt static const struct file_operations uio_fops; 47beafc54cSHans J. Koch 480d4a7bc1SJonathan Corbet /* Protect idr accesses */ 490d4a7bc1SJonathan Corbet static DEFINE_MUTEX(minor_lock); 500d4a7bc1SJonathan Corbet 51beafc54cSHans J. Koch /* 52beafc54cSHans J. Koch * attributes 53beafc54cSHans J. Koch */ 54beafc54cSHans J. Koch 5581e7c6a6SGreg Kroah-Hartman struct uio_map { 5681e7c6a6SGreg Kroah-Hartman struct kobject kobj; 5781e7c6a6SGreg Kroah-Hartman struct uio_mem *mem; 58beafc54cSHans J. Koch }; 5981e7c6a6SGreg Kroah-Hartman #define to_map(map) container_of(map, struct uio_map, kobj) 60beafc54cSHans J. Koch 6182057791SHans J. Koch static ssize_t map_name_show(struct uio_mem *mem, char *buf) 6282057791SHans J. Koch { 6382057791SHans J. Koch if (unlikely(!mem->name)) 6482057791SHans J. Koch mem->name = ""; 6582057791SHans J. Koch 6682057791SHans J. Koch return sprintf(buf, "%s\n", mem->name); 6782057791SHans J. Koch } 6882057791SHans J. Koch 694f808bcdSBrandon Philips static ssize_t map_addr_show(struct uio_mem *mem, char *buf) 70beafc54cSHans J. Koch { 7127a90700SKai Jiang return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr); 72beafc54cSHans J. Koch } 73beafc54cSHans J. Koch 744f808bcdSBrandon Philips static ssize_t map_size_show(struct uio_mem *mem, char *buf) 754f808bcdSBrandon Philips { 764f808bcdSBrandon Philips return sprintf(buf, "0x%lx\n", mem->size); 774f808bcdSBrandon Philips } 784f808bcdSBrandon Philips 79e2b39df1SHans J. Koch static ssize_t map_offset_show(struct uio_mem *mem, char *buf) 80e2b39df1SHans J. Koch { 8127a90700SKai Jiang return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr & ~PAGE_MASK); 82e2b39df1SHans J. Koch } 83e2b39df1SHans J. Koch 84e70c412eSHans J. Koch struct map_sysfs_entry { 854f808bcdSBrandon Philips struct attribute attr; 864f808bcdSBrandon Philips ssize_t (*show)(struct uio_mem *, char *); 874f808bcdSBrandon Philips ssize_t (*store)(struct uio_mem *, const char *, size_t); 884f808bcdSBrandon Philips }; 894f808bcdSBrandon Philips 9082057791SHans J. Koch static struct map_sysfs_entry name_attribute = 9182057791SHans J. Koch __ATTR(name, S_IRUGO, map_name_show, NULL); 92e70c412eSHans J. Koch static struct map_sysfs_entry addr_attribute = 934f808bcdSBrandon Philips __ATTR(addr, S_IRUGO, map_addr_show, NULL); 94e70c412eSHans J. Koch static struct map_sysfs_entry size_attribute = 954f808bcdSBrandon Philips __ATTR(size, S_IRUGO, map_size_show, NULL); 96e70c412eSHans J. Koch static struct map_sysfs_entry offset_attribute = 97e2b39df1SHans J. Koch __ATTR(offset, S_IRUGO, map_offset_show, NULL); 98beafc54cSHans J. Koch 9981e7c6a6SGreg Kroah-Hartman static struct attribute *attrs[] = { 10082057791SHans J. Koch &name_attribute.attr, 1014f808bcdSBrandon Philips &addr_attribute.attr, 10281e7c6a6SGreg Kroah-Hartman &size_attribute.attr, 103e2b39df1SHans J. Koch &offset_attribute.attr, 10481e7c6a6SGreg Kroah-Hartman NULL, /* need to NULL terminate the list of attributes */ 105beafc54cSHans J. Koch }; 106beafc54cSHans J. Koch 10781e7c6a6SGreg Kroah-Hartman static void map_release(struct kobject *kobj) 10881e7c6a6SGreg Kroah-Hartman { 10981e7c6a6SGreg Kroah-Hartman struct uio_map *map = to_map(kobj); 11081e7c6a6SGreg Kroah-Hartman kfree(map); 11181e7c6a6SGreg Kroah-Hartman } 11281e7c6a6SGreg Kroah-Hartman 1134f808bcdSBrandon Philips static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, 1144f808bcdSBrandon Philips char *buf) 1154f808bcdSBrandon Philips { 1164f808bcdSBrandon Philips struct uio_map *map = to_map(kobj); 1174f808bcdSBrandon Philips struct uio_mem *mem = map->mem; 118e70c412eSHans J. Koch struct map_sysfs_entry *entry; 1194f808bcdSBrandon Philips 120e70c412eSHans J. Koch entry = container_of(attr, struct map_sysfs_entry, attr); 1214f808bcdSBrandon Philips 1224f808bcdSBrandon Philips if (!entry->show) 1234f808bcdSBrandon Philips return -EIO; 1244f808bcdSBrandon Philips 1254f808bcdSBrandon Philips return entry->show(mem, buf); 1264f808bcdSBrandon Philips } 1274f808bcdSBrandon Philips 12852cf25d0SEmese Revfy static const struct sysfs_ops map_sysfs_ops = { 1294f808bcdSBrandon Philips .show = map_type_show, 1304f808bcdSBrandon Philips }; 1314f808bcdSBrandon Philips 132beafc54cSHans J. Koch static struct kobj_type map_attr_type = { 13381e7c6a6SGreg Kroah-Hartman .release = map_release, 134e70c412eSHans J. Koch .sysfs_ops = &map_sysfs_ops, 13581e7c6a6SGreg Kroah-Hartman .default_attrs = attrs, 136beafc54cSHans J. Koch }; 137beafc54cSHans J. Koch 138e70c412eSHans J. Koch struct uio_portio { 139e70c412eSHans J. Koch struct kobject kobj; 140e70c412eSHans J. Koch struct uio_port *port; 141e70c412eSHans J. Koch }; 142e70c412eSHans J. Koch #define to_portio(portio) container_of(portio, struct uio_portio, kobj) 143e70c412eSHans J. Koch 14482057791SHans J. Koch static ssize_t portio_name_show(struct uio_port *port, char *buf) 14582057791SHans J. Koch { 14682057791SHans J. Koch if (unlikely(!port->name)) 14782057791SHans J. Koch port->name = ""; 14882057791SHans J. Koch 14982057791SHans J. Koch return sprintf(buf, "%s\n", port->name); 15082057791SHans J. Koch } 15182057791SHans J. Koch 152e70c412eSHans J. Koch static ssize_t portio_start_show(struct uio_port *port, char *buf) 153e70c412eSHans J. Koch { 154e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->start); 155e70c412eSHans J. Koch } 156e70c412eSHans J. Koch 157e70c412eSHans J. Koch static ssize_t portio_size_show(struct uio_port *port, char *buf) 158e70c412eSHans J. Koch { 159e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->size); 160e70c412eSHans J. Koch } 161e70c412eSHans J. Koch 162e70c412eSHans J. Koch static ssize_t portio_porttype_show(struct uio_port *port, char *buf) 163e70c412eSHans J. Koch { 164e70c412eSHans J. Koch const char *porttypes[] = {"none", "x86", "gpio", "other"}; 165e70c412eSHans J. Koch 166e70c412eSHans J. Koch if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) 167e70c412eSHans J. Koch return -EINVAL; 168e70c412eSHans J. Koch 169e70c412eSHans J. Koch return sprintf(buf, "port_%s\n", porttypes[port->porttype]); 170e70c412eSHans J. Koch } 171e70c412eSHans J. Koch 172e70c412eSHans J. Koch struct portio_sysfs_entry { 173e70c412eSHans J. Koch struct attribute attr; 174e70c412eSHans J. Koch ssize_t (*show)(struct uio_port *, char *); 175e70c412eSHans J. Koch ssize_t (*store)(struct uio_port *, const char *, size_t); 176e70c412eSHans J. Koch }; 177e70c412eSHans J. Koch 17882057791SHans J. Koch static struct portio_sysfs_entry portio_name_attribute = 17982057791SHans J. Koch __ATTR(name, S_IRUGO, portio_name_show, NULL); 180e70c412eSHans J. Koch static struct portio_sysfs_entry portio_start_attribute = 181e70c412eSHans J. Koch __ATTR(start, S_IRUGO, portio_start_show, NULL); 182e70c412eSHans J. Koch static struct portio_sysfs_entry portio_size_attribute = 183e70c412eSHans J. Koch __ATTR(size, S_IRUGO, portio_size_show, NULL); 184e70c412eSHans J. Koch static struct portio_sysfs_entry portio_porttype_attribute = 185e70c412eSHans J. Koch __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); 186e70c412eSHans J. Koch 187e70c412eSHans J. Koch static struct attribute *portio_attrs[] = { 18882057791SHans J. Koch &portio_name_attribute.attr, 189e70c412eSHans J. Koch &portio_start_attribute.attr, 190e70c412eSHans J. Koch &portio_size_attribute.attr, 191e70c412eSHans J. Koch &portio_porttype_attribute.attr, 192e70c412eSHans J. Koch NULL, 193e70c412eSHans J. Koch }; 194e70c412eSHans J. Koch 195e70c412eSHans J. Koch static void portio_release(struct kobject *kobj) 196e70c412eSHans J. Koch { 197e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 198e70c412eSHans J. Koch kfree(portio); 199e70c412eSHans J. Koch } 200e70c412eSHans J. Koch 201e70c412eSHans J. Koch static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, 202e70c412eSHans J. Koch char *buf) 203e70c412eSHans J. Koch { 204e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 205e70c412eSHans J. Koch struct uio_port *port = portio->port; 206e70c412eSHans J. Koch struct portio_sysfs_entry *entry; 207e70c412eSHans J. Koch 208e70c412eSHans J. Koch entry = container_of(attr, struct portio_sysfs_entry, attr); 209e70c412eSHans J. Koch 210e70c412eSHans J. Koch if (!entry->show) 211e70c412eSHans J. Koch return -EIO; 212e70c412eSHans J. Koch 213e70c412eSHans J. Koch return entry->show(port, buf); 214e70c412eSHans J. Koch } 215e70c412eSHans J. Koch 21652cf25d0SEmese Revfy static const struct sysfs_ops portio_sysfs_ops = { 217e70c412eSHans J. Koch .show = portio_type_show, 218e70c412eSHans J. Koch }; 219e70c412eSHans J. Koch 220e70c412eSHans J. Koch static struct kobj_type portio_attr_type = { 221e70c412eSHans J. Koch .release = portio_release, 222e70c412eSHans J. Koch .sysfs_ops = &portio_sysfs_ops, 223e70c412eSHans J. Koch .default_attrs = portio_attrs, 224e70c412eSHans J. Koch }; 225e70c412eSHans J. Koch 226c9dce927SGreg Kroah-Hartman static ssize_t name_show(struct device *dev, 227beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 228beafc54cSHans J. Koch { 229beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 230beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->name); 231beafc54cSHans J. Koch } 232c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(name); 233beafc54cSHans J. Koch 234c9dce927SGreg Kroah-Hartman static ssize_t version_show(struct device *dev, 235beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 236beafc54cSHans J. Koch { 237beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 238beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->version); 239beafc54cSHans J. Koch } 240c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(version); 241beafc54cSHans J. Koch 242c9dce927SGreg Kroah-Hartman static ssize_t event_show(struct device *dev, 243beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 244beafc54cSHans J. Koch { 245beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 24670a9156bSEric W. Biederman return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); 247beafc54cSHans J. Koch } 248c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(event); 249beafc54cSHans J. Koch 250c9dce927SGreg Kroah-Hartman static struct attribute *uio_attrs[] = { 251c9dce927SGreg Kroah-Hartman &dev_attr_name.attr, 252c9dce927SGreg Kroah-Hartman &dev_attr_version.attr, 253c9dce927SGreg Kroah-Hartman &dev_attr_event.attr, 254c9dce927SGreg Kroah-Hartman NULL, 255beafc54cSHans J. Koch }; 256c9dce927SGreg Kroah-Hartman ATTRIBUTE_GROUPS(uio); 257beafc54cSHans J. Koch 258c66fdab6SEric W. Biederman /* UIO class infrastructure */ 259c66fdab6SEric W. Biederman static struct class uio_class = { 260c66fdab6SEric W. Biederman .name = "uio", 261c9dce927SGreg Kroah-Hartman .dev_groups = uio_groups, 262beafc54cSHans J. Koch }; 263beafc54cSHans J. Koch 264beafc54cSHans J. Koch /* 265beafc54cSHans J. Koch * device functions 266beafc54cSHans J. Koch */ 267beafc54cSHans J. Koch static int uio_dev_add_attributes(struct uio_device *idev) 268beafc54cSHans J. Koch { 269beafc54cSHans J. Koch int ret; 270e70c412eSHans J. Koch int mi, pi; 271beafc54cSHans J. Koch int map_found = 0; 272e70c412eSHans J. Koch int portio_found = 0; 273beafc54cSHans J. Koch struct uio_mem *mem; 27481e7c6a6SGreg Kroah-Hartman struct uio_map *map; 275e70c412eSHans J. Koch struct uio_port *port; 276e70c412eSHans J. Koch struct uio_portio *portio; 277beafc54cSHans J. Koch 278beafc54cSHans J. Koch for (mi = 0; mi < MAX_UIO_MAPS; mi++) { 279beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 280beafc54cSHans J. Koch if (mem->size == 0) 281beafc54cSHans J. Koch break; 282beafc54cSHans J. Koch if (!map_found) { 283beafc54cSHans J. Koch map_found = 1; 28481e7c6a6SGreg Kroah-Hartman idev->map_dir = kobject_create_and_add("maps", 28581e7c6a6SGreg Kroah-Hartman &idev->dev->kobj); 28681e7c6a6SGreg Kroah-Hartman if (!idev->map_dir) 287e70c412eSHans J. Koch goto err_map; 288beafc54cSHans J. Koch } 28981e7c6a6SGreg Kroah-Hartman map = kzalloc(sizeof(*map), GFP_KERNEL); 29081e7c6a6SGreg Kroah-Hartman if (!map) 291e70c412eSHans J. Koch goto err_map; 292f9cb074bSGreg Kroah-Hartman kobject_init(&map->kobj, &map_attr_type); 29381e7c6a6SGreg Kroah-Hartman map->mem = mem; 29481e7c6a6SGreg Kroah-Hartman mem->map = map; 295b2d6db58SGreg Kroah-Hartman ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); 296beafc54cSHans J. Koch if (ret) 297e70c412eSHans J. Koch goto err_map; 29881e7c6a6SGreg Kroah-Hartman ret = kobject_uevent(&map->kobj, KOBJ_ADD); 29981e7c6a6SGreg Kroah-Hartman if (ret) 300e70c412eSHans J. Koch goto err_map; 301e70c412eSHans J. Koch } 302e70c412eSHans J. Koch 303e70c412eSHans J. Koch for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { 304e70c412eSHans J. Koch port = &idev->info->port[pi]; 305e70c412eSHans J. Koch if (port->size == 0) 306e70c412eSHans J. Koch break; 307e70c412eSHans J. Koch if (!portio_found) { 308e70c412eSHans J. Koch portio_found = 1; 309e70c412eSHans J. Koch idev->portio_dir = kobject_create_and_add("portio", 310e70c412eSHans J. Koch &idev->dev->kobj); 311e70c412eSHans J. Koch if (!idev->portio_dir) 312e70c412eSHans J. Koch goto err_portio; 313e70c412eSHans J. Koch } 314e70c412eSHans J. Koch portio = kzalloc(sizeof(*portio), GFP_KERNEL); 315e70c412eSHans J. Koch if (!portio) 316e70c412eSHans J. Koch goto err_portio; 317e70c412eSHans J. Koch kobject_init(&portio->kobj, &portio_attr_type); 318e70c412eSHans J. Koch portio->port = port; 319e70c412eSHans J. Koch port->portio = portio; 320e70c412eSHans J. Koch ret = kobject_add(&portio->kobj, idev->portio_dir, 321e70c412eSHans J. Koch "port%d", pi); 322e70c412eSHans J. Koch if (ret) 323e70c412eSHans J. Koch goto err_portio; 324e70c412eSHans J. Koch ret = kobject_uevent(&portio->kobj, KOBJ_ADD); 325e70c412eSHans J. Koch if (ret) 326e70c412eSHans J. Koch goto err_portio; 327beafc54cSHans J. Koch } 328beafc54cSHans J. Koch 329beafc54cSHans J. Koch return 0; 330beafc54cSHans J. Koch 331e70c412eSHans J. Koch err_portio: 332e70c412eSHans J. Koch for (pi--; pi >= 0; pi--) { 333e70c412eSHans J. Koch port = &idev->info->port[pi]; 334e70c412eSHans J. Koch portio = port->portio; 335e70c412eSHans J. Koch kobject_put(&portio->kobj); 336e70c412eSHans J. Koch } 337e70c412eSHans J. Koch kobject_put(idev->portio_dir); 338e70c412eSHans J. Koch err_map: 339beafc54cSHans J. Koch for (mi--; mi>=0; mi--) { 340beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 34181e7c6a6SGreg Kroah-Hartman map = mem->map; 342c10997f6SGreg Kroah-Hartman kobject_put(&map->kobj); 343beafc54cSHans J. Koch } 344c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 345beafc54cSHans J. Koch dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); 346beafc54cSHans J. Koch return ret; 347beafc54cSHans J. Koch } 348beafc54cSHans J. Koch 349beafc54cSHans J. Koch static void uio_dev_del_attributes(struct uio_device *idev) 350beafc54cSHans J. Koch { 351e70c412eSHans J. Koch int i; 352beafc54cSHans J. Koch struct uio_mem *mem; 353e70c412eSHans J. Koch struct uio_port *port; 354e70c412eSHans J. Koch 355e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_MAPS; i++) { 356e70c412eSHans J. Koch mem = &idev->info->mem[i]; 357beafc54cSHans J. Koch if (mem->size == 0) 358beafc54cSHans J. Koch break; 359c10997f6SGreg Kroah-Hartman kobject_put(&mem->map->kobj); 360beafc54cSHans J. Koch } 361c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 362e70c412eSHans J. Koch 363e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { 364e70c412eSHans J. Koch port = &idev->info->port[i]; 365e70c412eSHans J. Koch if (port->size == 0) 366e70c412eSHans J. Koch break; 367e70c412eSHans J. Koch kobject_put(&port->portio->kobj); 368e70c412eSHans J. Koch } 369e70c412eSHans J. Koch kobject_put(idev->portio_dir); 370beafc54cSHans J. Koch } 371beafc54cSHans J. Koch 372beafc54cSHans J. Koch static int uio_get_minor(struct uio_device *idev) 373beafc54cSHans J. Koch { 374beafc54cSHans J. Koch int retval = -ENOMEM; 375beafc54cSHans J. Koch 376beafc54cSHans J. Koch mutex_lock(&minor_lock); 3776d770931STejun Heo retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL); 3786d770931STejun Heo if (retval >= 0) { 3796d770931STejun Heo idev->minor = retval; 3805ed0505cSDamian Hobson-Garcia retval = 0; 3816d770931STejun Heo } else if (retval == -ENOSPC) { 382c6edc42fSHillf Danton dev_err(idev->dev, "too many uio devices\n"); 383c6edc42fSHillf Danton retval = -EINVAL; 384c6edc42fSHillf Danton } 385beafc54cSHans J. Koch mutex_unlock(&minor_lock); 386beafc54cSHans J. Koch return retval; 387beafc54cSHans J. Koch } 388beafc54cSHans J. Koch 389beafc54cSHans J. Koch static void uio_free_minor(struct uio_device *idev) 390beafc54cSHans J. Koch { 3910d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 392beafc54cSHans J. Koch idr_remove(&uio_idr, idev->minor); 3930d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 394beafc54cSHans J. Koch } 395beafc54cSHans J. Koch 396beafc54cSHans J. Koch /** 397beafc54cSHans J. Koch * uio_event_notify - trigger an interrupt event 398beafc54cSHans J. Koch * @info: UIO device capabilities 399beafc54cSHans J. Koch */ 400beafc54cSHans J. Koch void uio_event_notify(struct uio_info *info) 401beafc54cSHans J. Koch { 402beafc54cSHans J. Koch struct uio_device *idev = info->uio_dev; 403beafc54cSHans J. Koch 404beafc54cSHans J. Koch atomic_inc(&idev->event); 405beafc54cSHans J. Koch wake_up_interruptible(&idev->wait); 406beafc54cSHans J. Koch kill_fasync(&idev->async_queue, SIGIO, POLL_IN); 407beafc54cSHans J. Koch } 408beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_event_notify); 409beafc54cSHans J. Koch 410beafc54cSHans J. Koch /** 411beafc54cSHans J. Koch * uio_interrupt - hardware interrupt handler 412beafc54cSHans J. Koch * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer 413beafc54cSHans J. Koch * @dev_id: Pointer to the devices uio_device structure 414beafc54cSHans J. Koch */ 415beafc54cSHans J. Koch static irqreturn_t uio_interrupt(int irq, void *dev_id) 416beafc54cSHans J. Koch { 417beafc54cSHans J. Koch struct uio_device *idev = (struct uio_device *)dev_id; 418beafc54cSHans J. Koch irqreturn_t ret = idev->info->handler(irq, idev->info); 419beafc54cSHans J. Koch 420beafc54cSHans J. Koch if (ret == IRQ_HANDLED) 421beafc54cSHans J. Koch uio_event_notify(idev->info); 422beafc54cSHans J. Koch 423beafc54cSHans J. Koch return ret; 424beafc54cSHans J. Koch } 425beafc54cSHans J. Koch 426beafc54cSHans J. Koch struct uio_listener { 427beafc54cSHans J. Koch struct uio_device *dev; 428beafc54cSHans J. Koch s32 event_count; 429beafc54cSHans J. Koch }; 430beafc54cSHans J. Koch 431beafc54cSHans J. Koch static int uio_open(struct inode *inode, struct file *filep) 432beafc54cSHans J. Koch { 433beafc54cSHans J. Koch struct uio_device *idev; 434beafc54cSHans J. Koch struct uio_listener *listener; 435beafc54cSHans J. Koch int ret = 0; 436beafc54cSHans J. Koch 4370d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 438beafc54cSHans J. Koch idev = idr_find(&uio_idr, iminor(inode)); 4390d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 440fbc8a81dSJonathan Corbet if (!idev) { 441fbc8a81dSJonathan Corbet ret = -ENODEV; 442fbc8a81dSJonathan Corbet goto out; 443fbc8a81dSJonathan Corbet } 444beafc54cSHans J. Koch 445fbc8a81dSJonathan Corbet if (!try_module_get(idev->owner)) { 446fbc8a81dSJonathan Corbet ret = -ENODEV; 447fbc8a81dSJonathan Corbet goto out; 448fbc8a81dSJonathan Corbet } 449610ad506SUwe Kleine-König 450beafc54cSHans J. Koch listener = kmalloc(sizeof(*listener), GFP_KERNEL); 451610ad506SUwe Kleine-König if (!listener) { 452610ad506SUwe Kleine-König ret = -ENOMEM; 453610ad506SUwe Kleine-König goto err_alloc_listener; 454610ad506SUwe Kleine-König } 455beafc54cSHans J. Koch 456beafc54cSHans J. Koch listener->dev = idev; 457beafc54cSHans J. Koch listener->event_count = atomic_read(&idev->event); 458beafc54cSHans J. Koch filep->private_data = listener; 459beafc54cSHans J. Koch 460beafc54cSHans J. Koch if (idev->info->open) { 461beafc54cSHans J. Koch ret = idev->info->open(idev->info, inode); 462610ad506SUwe Kleine-König if (ret) 463610ad506SUwe Kleine-König goto err_infoopen; 464beafc54cSHans J. Koch } 465610ad506SUwe Kleine-König return 0; 466610ad506SUwe Kleine-König 467610ad506SUwe Kleine-König err_infoopen: 468beafc54cSHans J. Koch kfree(listener); 469610ad506SUwe Kleine-König 4700d4a7bc1SJonathan Corbet err_alloc_listener: 471610ad506SUwe Kleine-König module_put(idev->owner); 472beafc54cSHans J. Koch 473fbc8a81dSJonathan Corbet out: 474beafc54cSHans J. Koch return ret; 475beafc54cSHans J. Koch } 476beafc54cSHans J. Koch 477beafc54cSHans J. Koch static int uio_fasync(int fd, struct file *filep, int on) 478beafc54cSHans J. Koch { 479beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 480beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 481beafc54cSHans J. Koch 482beafc54cSHans J. Koch return fasync_helper(fd, filep, on, &idev->async_queue); 483beafc54cSHans J. Koch } 484beafc54cSHans J. Koch 485beafc54cSHans J. Koch static int uio_release(struct inode *inode, struct file *filep) 486beafc54cSHans J. Koch { 487beafc54cSHans J. Koch int ret = 0; 488beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 489beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 490beafc54cSHans J. Koch 491610ad506SUwe Kleine-König if (idev->info->release) 492beafc54cSHans J. Koch ret = idev->info->release(idev->info, inode); 493610ad506SUwe Kleine-König 494beafc54cSHans J. Koch module_put(idev->owner); 495beafc54cSHans J. Koch kfree(listener); 496beafc54cSHans J. Koch return ret; 497beafc54cSHans J. Koch } 498beafc54cSHans J. Koch 499beafc54cSHans J. Koch static unsigned int uio_poll(struct file *filep, poll_table *wait) 500beafc54cSHans J. Koch { 501beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 502beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 503beafc54cSHans J. Koch 5046427a765SEric W. Biederman if (!idev->info->irq) 505beafc54cSHans J. Koch return -EIO; 506beafc54cSHans J. Koch 507beafc54cSHans J. Koch poll_wait(filep, &idev->wait, wait); 508beafc54cSHans J. Koch if (listener->event_count != atomic_read(&idev->event)) 509beafc54cSHans J. Koch return POLLIN | POLLRDNORM; 510beafc54cSHans J. Koch return 0; 511beafc54cSHans J. Koch } 512beafc54cSHans J. Koch 513beafc54cSHans J. Koch static ssize_t uio_read(struct file *filep, char __user *buf, 514beafc54cSHans J. Koch size_t count, loff_t *ppos) 515beafc54cSHans J. Koch { 516beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 517beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 518beafc54cSHans J. Koch DECLARE_WAITQUEUE(wait, current); 519beafc54cSHans J. Koch ssize_t retval; 520beafc54cSHans J. Koch s32 event_count; 521beafc54cSHans J. Koch 5226427a765SEric W. Biederman if (!idev->info->irq) 523beafc54cSHans J. Koch return -EIO; 524beafc54cSHans J. Koch 525beafc54cSHans J. Koch if (count != sizeof(s32)) 526beafc54cSHans J. Koch return -EINVAL; 527beafc54cSHans J. Koch 528beafc54cSHans J. Koch add_wait_queue(&idev->wait, &wait); 529beafc54cSHans J. Koch 530beafc54cSHans J. Koch do { 531beafc54cSHans J. Koch set_current_state(TASK_INTERRUPTIBLE); 532beafc54cSHans J. Koch 533beafc54cSHans J. Koch event_count = atomic_read(&idev->event); 534beafc54cSHans J. Koch if (event_count != listener->event_count) { 535beafc54cSHans J. Koch if (copy_to_user(buf, &event_count, count)) 536beafc54cSHans J. Koch retval = -EFAULT; 537beafc54cSHans J. Koch else { 538beafc54cSHans J. Koch listener->event_count = event_count; 539beafc54cSHans J. Koch retval = count; 540beafc54cSHans J. Koch } 541beafc54cSHans J. Koch break; 542beafc54cSHans J. Koch } 543beafc54cSHans J. Koch 544beafc54cSHans J. Koch if (filep->f_flags & O_NONBLOCK) { 545beafc54cSHans J. Koch retval = -EAGAIN; 546beafc54cSHans J. Koch break; 547beafc54cSHans J. Koch } 548beafc54cSHans J. Koch 549beafc54cSHans J. Koch if (signal_pending(current)) { 550beafc54cSHans J. Koch retval = -ERESTARTSYS; 551beafc54cSHans J. Koch break; 552beafc54cSHans J. Koch } 553beafc54cSHans J. Koch schedule(); 554beafc54cSHans J. Koch } while (1); 555beafc54cSHans J. Koch 556beafc54cSHans J. Koch __set_current_state(TASK_RUNNING); 557beafc54cSHans J. Koch remove_wait_queue(&idev->wait, &wait); 558beafc54cSHans J. Koch 559beafc54cSHans J. Koch return retval; 560beafc54cSHans J. Koch } 561beafc54cSHans J. Koch 562328a14e7SHans J. Koch static ssize_t uio_write(struct file *filep, const char __user *buf, 563328a14e7SHans J. Koch size_t count, loff_t *ppos) 564328a14e7SHans J. Koch { 565328a14e7SHans J. Koch struct uio_listener *listener = filep->private_data; 566328a14e7SHans J. Koch struct uio_device *idev = listener->dev; 567328a14e7SHans J. Koch ssize_t retval; 568328a14e7SHans J. Koch s32 irq_on; 569328a14e7SHans J. Koch 5706427a765SEric W. Biederman if (!idev->info->irq) 571328a14e7SHans J. Koch return -EIO; 572328a14e7SHans J. Koch 573328a14e7SHans J. Koch if (count != sizeof(s32)) 574328a14e7SHans J. Koch return -EINVAL; 575328a14e7SHans J. Koch 576328a14e7SHans J. Koch if (!idev->info->irqcontrol) 577328a14e7SHans J. Koch return -ENOSYS; 578328a14e7SHans J. Koch 579328a14e7SHans J. Koch if (copy_from_user(&irq_on, buf, count)) 580328a14e7SHans J. Koch return -EFAULT; 581328a14e7SHans J. Koch 582328a14e7SHans J. Koch retval = idev->info->irqcontrol(idev->info, irq_on); 583328a14e7SHans J. Koch 584328a14e7SHans J. Koch return retval ? retval : sizeof(s32); 585328a14e7SHans J. Koch } 586328a14e7SHans J. Koch 587beafc54cSHans J. Koch static int uio_find_mem_index(struct vm_area_struct *vma) 588beafc54cSHans J. Koch { 589beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 590beafc54cSHans J. Koch 591f0c554fdSHillf Danton if (vma->vm_pgoff < MAX_UIO_MAPS) { 592f0c554fdSHillf Danton if (idev->info->mem[vma->vm_pgoff].size == 0) 593beafc54cSHans J. Koch return -1; 594f0c554fdSHillf Danton return (int)vma->vm_pgoff; 595beafc54cSHans J. Koch } 596beafc54cSHans J. Koch return -1; 597beafc54cSHans J. Koch } 598beafc54cSHans J. Koch 599a18b630dSNick Piggin static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 600beafc54cSHans J. Koch { 601beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 602a18b630dSNick Piggin struct page *page; 60302683ffdSAndrew G. Harvey unsigned long offset; 604beafc54cSHans J. Koch 605beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 606beafc54cSHans J. Koch if (mi < 0) 607a18b630dSNick Piggin return VM_FAULT_SIGBUS; 608beafc54cSHans J. Koch 60902683ffdSAndrew G. Harvey /* 61002683ffdSAndrew G. Harvey * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 61102683ffdSAndrew G. Harvey * to use mem[N]. 61202683ffdSAndrew G. Harvey */ 61302683ffdSAndrew G. Harvey offset = (vmf->pgoff - mi) << PAGE_SHIFT; 61402683ffdSAndrew G. Harvey 615beafc54cSHans J. Koch if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) 61602683ffdSAndrew G. Harvey page = virt_to_page(idev->info->mem[mi].addr + offset); 617beafc54cSHans J. Koch else 61827a90700SKai Jiang page = vmalloc_to_page((void *)(unsigned long)idev->info->mem[mi].addr + offset); 619beafc54cSHans J. Koch get_page(page); 620a18b630dSNick Piggin vmf->page = page; 621a18b630dSNick Piggin return 0; 622beafc54cSHans J. Koch } 623beafc54cSHans J. Koch 6247294151dSUwe Kleine-König static const struct vm_operations_struct uio_logical_vm_ops = { 625a18b630dSNick Piggin .fault = uio_vma_fault, 626beafc54cSHans J. Koch }; 627beafc54cSHans J. Koch 6287294151dSUwe Kleine-König static int uio_mmap_logical(struct vm_area_struct *vma) 6297294151dSUwe Kleine-König { 6307294151dSUwe Kleine-König vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 6317294151dSUwe Kleine-König vma->vm_ops = &uio_logical_vm_ops; 6327294151dSUwe Kleine-König return 0; 6337294151dSUwe Kleine-König } 6347294151dSUwe Kleine-König 6357294151dSUwe Kleine-König static const struct vm_operations_struct uio_physical_vm_ops = { 6367294151dSUwe Kleine-König #ifdef CONFIG_HAVE_IOREMAP_PROT 6377294151dSUwe Kleine-König .access = generic_access_phys, 6387294151dSUwe Kleine-König #endif 6397294151dSUwe Kleine-König }; 6407294151dSUwe Kleine-König 641beafc54cSHans J. Koch static int uio_mmap_physical(struct vm_area_struct *vma) 642beafc54cSHans J. Koch { 643beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 644beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 645beafc54cSHans J. Koch if (mi < 0) 646beafc54cSHans J. Koch return -EINVAL; 647beafc54cSHans J. Koch 6487294151dSUwe Kleine-König vma->vm_ops = &uio_physical_vm_ops; 6497294151dSUwe Kleine-König 650c9698d6bSJean-Samuel Chenard vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 651c9698d6bSJean-Samuel Chenard 652beafc54cSHans J. Koch return remap_pfn_range(vma, 653beafc54cSHans J. Koch vma->vm_start, 654beafc54cSHans J. Koch idev->info->mem[mi].addr >> PAGE_SHIFT, 655beafc54cSHans J. Koch vma->vm_end - vma->vm_start, 656beafc54cSHans J. Koch vma->vm_page_prot); 657beafc54cSHans J. Koch } 658beafc54cSHans J. Koch 659beafc54cSHans J. Koch static int uio_mmap(struct file *filep, struct vm_area_struct *vma) 660beafc54cSHans J. Koch { 661beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 662beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 663beafc54cSHans J. Koch int mi; 664beafc54cSHans J. Koch unsigned long requested_pages, actual_pages; 665beafc54cSHans J. Koch int ret = 0; 666beafc54cSHans J. Koch 667beafc54cSHans J. Koch if (vma->vm_end < vma->vm_start) 668beafc54cSHans J. Koch return -EINVAL; 669beafc54cSHans J. Koch 670beafc54cSHans J. Koch vma->vm_private_data = idev; 671beafc54cSHans J. Koch 672beafc54cSHans J. Koch mi = uio_find_mem_index(vma); 673beafc54cSHans J. Koch if (mi < 0) 674beafc54cSHans J. Koch return -EINVAL; 675beafc54cSHans J. Koch 67652c2dad9SLibin requested_pages = vma_pages(vma); 6776da2d377SIan Abbott actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) 6786da2d377SIan Abbott + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; 679beafc54cSHans J. Koch if (requested_pages > actual_pages) 680beafc54cSHans J. Koch return -EINVAL; 681beafc54cSHans J. Koch 682beafc54cSHans J. Koch if (idev->info->mmap) { 683beafc54cSHans J. Koch ret = idev->info->mmap(idev->info, vma); 684beafc54cSHans J. Koch return ret; 685beafc54cSHans J. Koch } 686beafc54cSHans J. Koch 687beafc54cSHans J. Koch switch (idev->info->mem[mi].memtype) { 688beafc54cSHans J. Koch case UIO_MEM_PHYS: 689beafc54cSHans J. Koch return uio_mmap_physical(vma); 690beafc54cSHans J. Koch case UIO_MEM_LOGICAL: 691beafc54cSHans J. Koch case UIO_MEM_VIRTUAL: 692beafc54cSHans J. Koch return uio_mmap_logical(vma); 693beafc54cSHans J. Koch default: 694beafc54cSHans J. Koch return -EINVAL; 695beafc54cSHans J. Koch } 696beafc54cSHans J. Koch } 697beafc54cSHans J. Koch 6984f014691SJan Engelhardt static const struct file_operations uio_fops = { 699beafc54cSHans J. Koch .owner = THIS_MODULE, 700beafc54cSHans J. Koch .open = uio_open, 701beafc54cSHans J. Koch .release = uio_release, 702beafc54cSHans J. Koch .read = uio_read, 703328a14e7SHans J. Koch .write = uio_write, 704beafc54cSHans J. Koch .mmap = uio_mmap, 705beafc54cSHans J. Koch .poll = uio_poll, 706beafc54cSHans J. Koch .fasync = uio_fasync, 7076038f373SArnd Bergmann .llseek = noop_llseek, 708beafc54cSHans J. Koch }; 709beafc54cSHans J. Koch 710beafc54cSHans J. Koch static int uio_major_init(void) 711beafc54cSHans J. Koch { 71291960a46SEric W. Biederman static const char name[] = "uio"; 71391960a46SEric W. Biederman struct cdev *cdev = NULL; 71491960a46SEric W. Biederman dev_t uio_dev = 0; 71591960a46SEric W. Biederman int result; 71691960a46SEric W. Biederman 71791960a46SEric W. Biederman result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); 71891960a46SEric W. Biederman if (result) 71991960a46SEric W. Biederman goto out; 72091960a46SEric W. Biederman 72191960a46SEric W. Biederman result = -ENOMEM; 72291960a46SEric W. Biederman cdev = cdev_alloc(); 72391960a46SEric W. Biederman if (!cdev) 72491960a46SEric W. Biederman goto out_unregister; 72591960a46SEric W. Biederman 72691960a46SEric W. Biederman cdev->owner = THIS_MODULE; 72791960a46SEric W. Biederman cdev->ops = &uio_fops; 72891960a46SEric W. Biederman kobject_set_name(&cdev->kobj, "%s", name); 72991960a46SEric W. Biederman 73091960a46SEric W. Biederman result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); 73191960a46SEric W. Biederman if (result) 73291960a46SEric W. Biederman goto out_put; 73391960a46SEric W. Biederman 73491960a46SEric W. Biederman uio_major = MAJOR(uio_dev); 73591960a46SEric W. Biederman uio_cdev = cdev; 736d80df1ceSWanlong Gao return 0; 73791960a46SEric W. Biederman out_put: 73891960a46SEric W. Biederman kobject_put(&cdev->kobj); 73991960a46SEric W. Biederman out_unregister: 74091960a46SEric W. Biederman unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); 741d80df1ceSWanlong Gao out: 742d80df1ceSWanlong Gao return result; 743beafc54cSHans J. Koch } 744beafc54cSHans J. Koch 745beafc54cSHans J. Koch static void uio_major_cleanup(void) 746beafc54cSHans J. Koch { 74791960a46SEric W. Biederman unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); 74891960a46SEric W. Biederman cdev_del(uio_cdev); 749beafc54cSHans J. Koch } 750beafc54cSHans J. Koch 751beafc54cSHans J. Koch static int init_uio_class(void) 752beafc54cSHans J. Koch { 7533d4f9d76SEric W. Biederman int ret; 754beafc54cSHans J. Koch 755beafc54cSHans J. Koch /* This is the first time in here, set everything up properly */ 756beafc54cSHans J. Koch ret = uio_major_init(); 757beafc54cSHans J. Koch if (ret) 758beafc54cSHans J. Koch goto exit; 759beafc54cSHans J. Koch 760c66fdab6SEric W. Biederman ret = class_register(&uio_class); 761c66fdab6SEric W. Biederman if (ret) { 762c66fdab6SEric W. Biederman printk(KERN_ERR "class_register failed for uio\n"); 763c66fdab6SEric W. Biederman goto err_class_register; 764beafc54cSHans J. Koch } 765beafc54cSHans J. Koch return 0; 766beafc54cSHans J. Koch 767c66fdab6SEric W. Biederman err_class_register: 768beafc54cSHans J. Koch uio_major_cleanup(); 769beafc54cSHans J. Koch exit: 770beafc54cSHans J. Koch return ret; 771beafc54cSHans J. Koch } 772beafc54cSHans J. Koch 7733d4f9d76SEric W. Biederman static void release_uio_class(void) 774beafc54cSHans J. Koch { 775c66fdab6SEric W. Biederman class_unregister(&uio_class); 776beafc54cSHans J. Koch uio_major_cleanup(); 777beafc54cSHans J. Koch } 778beafc54cSHans J. Koch 779beafc54cSHans J. Koch /** 780beafc54cSHans J. Koch * uio_register_device - register a new userspace IO device 781beafc54cSHans J. Koch * @owner: module that creates the new device 782beafc54cSHans J. Koch * @parent: parent device 783beafc54cSHans J. Koch * @info: UIO device capabilities 784beafc54cSHans J. Koch * 785beafc54cSHans J. Koch * returns zero on success or a negative error code. 786beafc54cSHans J. Koch */ 787beafc54cSHans J. Koch int __uio_register_device(struct module *owner, 788beafc54cSHans J. Koch struct device *parent, 789beafc54cSHans J. Koch struct uio_info *info) 790beafc54cSHans J. Koch { 791beafc54cSHans J. Koch struct uio_device *idev; 792beafc54cSHans J. Koch int ret = 0; 793beafc54cSHans J. Koch 794beafc54cSHans J. Koch if (!parent || !info || !info->name || !info->version) 795beafc54cSHans J. Koch return -EINVAL; 796beafc54cSHans J. Koch 797beafc54cSHans J. Koch info->uio_dev = NULL; 798beafc54cSHans J. Koch 799e6789cd3SMichal Simek idev = devm_kzalloc(parent, sizeof(*idev), GFP_KERNEL); 800beafc54cSHans J. Koch if (!idev) { 801e6789cd3SMichal Simek return -ENOMEM; 802beafc54cSHans J. Koch } 803beafc54cSHans J. Koch 804beafc54cSHans J. Koch idev->owner = owner; 805beafc54cSHans J. Koch idev->info = info; 806beafc54cSHans J. Koch init_waitqueue_head(&idev->wait); 807beafc54cSHans J. Koch atomic_set(&idev->event, 0); 808beafc54cSHans J. Koch 809beafc54cSHans J. Koch ret = uio_get_minor(idev); 810beafc54cSHans J. Koch if (ret) 811e6789cd3SMichal Simek return ret; 812beafc54cSHans J. Koch 813c66fdab6SEric W. Biederman idev->dev = device_create(&uio_class, parent, 81443691da4SGreg Kroah-Hartman MKDEV(uio_major, idev->minor), idev, 815beafc54cSHans J. Koch "uio%d", idev->minor); 816beafc54cSHans J. Koch if (IS_ERR(idev->dev)) { 817beafc54cSHans J. Koch printk(KERN_ERR "UIO: device register failed\n"); 818beafc54cSHans J. Koch ret = PTR_ERR(idev->dev); 819beafc54cSHans J. Koch goto err_device_create; 820beafc54cSHans J. Koch } 821beafc54cSHans J. Koch 822beafc54cSHans J. Koch ret = uio_dev_add_attributes(idev); 823beafc54cSHans J. Koch if (ret) 824beafc54cSHans J. Koch goto err_uio_dev_add_attributes; 825beafc54cSHans J. Koch 826beafc54cSHans J. Koch info->uio_dev = idev; 827beafc54cSHans J. Koch 8286427a765SEric W. Biederman if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { 829e6789cd3SMichal Simek ret = devm_request_irq(parent, info->irq, uio_interrupt, 8306427a765SEric W. Biederman info->irq_flags, info->name, idev); 831beafc54cSHans J. Koch if (ret) 832beafc54cSHans J. Koch goto err_request_irq; 833beafc54cSHans J. Koch } 834beafc54cSHans J. Koch 835beafc54cSHans J. Koch return 0; 836beafc54cSHans J. Koch 837beafc54cSHans J. Koch err_request_irq: 838beafc54cSHans J. Koch uio_dev_del_attributes(idev); 839beafc54cSHans J. Koch err_uio_dev_add_attributes: 840c66fdab6SEric W. Biederman device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); 841beafc54cSHans J. Koch err_device_create: 842beafc54cSHans J. Koch uio_free_minor(idev); 843beafc54cSHans J. Koch return ret; 844beafc54cSHans J. Koch } 845beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(__uio_register_device); 846beafc54cSHans J. Koch 847beafc54cSHans J. Koch /** 848beafc54cSHans J. Koch * uio_unregister_device - unregister a industrial IO device 849beafc54cSHans J. Koch * @info: UIO device capabilities 850beafc54cSHans J. Koch * 851beafc54cSHans J. Koch */ 852beafc54cSHans J. Koch void uio_unregister_device(struct uio_info *info) 853beafc54cSHans J. Koch { 854beafc54cSHans J. Koch struct uio_device *idev; 855beafc54cSHans J. Koch 856beafc54cSHans J. Koch if (!info || !info->uio_dev) 857beafc54cSHans J. Koch return; 858beafc54cSHans J. Koch 859beafc54cSHans J. Koch idev = info->uio_dev; 860beafc54cSHans J. Koch 861beafc54cSHans J. Koch uio_free_minor(idev); 862beafc54cSHans J. Koch 863beafc54cSHans J. Koch uio_dev_del_attributes(idev); 864beafc54cSHans J. Koch 865c66fdab6SEric W. Biederman device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); 866beafc54cSHans J. Koch 867beafc54cSHans J. Koch return; 868beafc54cSHans J. Koch } 869beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_unregister_device); 870beafc54cSHans J. Koch 871beafc54cSHans J. Koch static int __init uio_init(void) 872beafc54cSHans J. Koch { 8733d4f9d76SEric W. Biederman return init_uio_class(); 874beafc54cSHans J. Koch } 875beafc54cSHans J. Koch 876beafc54cSHans J. Koch static void __exit uio_exit(void) 877beafc54cSHans J. Koch { 8783d4f9d76SEric W. Biederman release_uio_class(); 879beafc54cSHans J. Koch } 880beafc54cSHans J. Koch 881beafc54cSHans J. Koch module_init(uio_init) 882beafc54cSHans J. Koch module_exit(uio_exit) 883beafc54cSHans J. Koch MODULE_LICENSE("GPL v2"); 884