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 static int uio_major; 3291960a46SEric W. Biederman static struct cdev *uio_cdev; 33beafc54cSHans J. Koch static DEFINE_IDR(uio_idr); 344f014691SJan Engelhardt static const struct file_operations uio_fops; 35beafc54cSHans J. Koch 360d4a7bc1SJonathan Corbet /* Protect idr accesses */ 370d4a7bc1SJonathan Corbet static DEFINE_MUTEX(minor_lock); 380d4a7bc1SJonathan Corbet 39beafc54cSHans J. Koch /* 40beafc54cSHans J. Koch * attributes 41beafc54cSHans J. Koch */ 42beafc54cSHans J. Koch 4381e7c6a6SGreg Kroah-Hartman struct uio_map { 4481e7c6a6SGreg Kroah-Hartman struct kobject kobj; 4581e7c6a6SGreg Kroah-Hartman struct uio_mem *mem; 46beafc54cSHans J. Koch }; 4781e7c6a6SGreg Kroah-Hartman #define to_map(map) container_of(map, struct uio_map, kobj) 48beafc54cSHans J. Koch 4982057791SHans J. Koch static ssize_t map_name_show(struct uio_mem *mem, char *buf) 5082057791SHans J. Koch { 5182057791SHans J. Koch if (unlikely(!mem->name)) 5282057791SHans J. Koch mem->name = ""; 5382057791SHans J. Koch 5482057791SHans J. Koch return sprintf(buf, "%s\n", mem->name); 5582057791SHans J. Koch } 5682057791SHans J. Koch 574f808bcdSBrandon Philips static ssize_t map_addr_show(struct uio_mem *mem, char *buf) 58beafc54cSHans J. Koch { 59e0f1147cSCristian Stoica return sprintf(buf, "%pa\n", &mem->addr); 60beafc54cSHans J. Koch } 61beafc54cSHans J. Koch 624f808bcdSBrandon Philips static ssize_t map_size_show(struct uio_mem *mem, char *buf) 634f808bcdSBrandon Philips { 64e0f1147cSCristian Stoica return sprintf(buf, "%pa\n", &mem->size); 654f808bcdSBrandon Philips } 664f808bcdSBrandon Philips 67e2b39df1SHans J. Koch static ssize_t map_offset_show(struct uio_mem *mem, char *buf) 68e2b39df1SHans J. Koch { 6927a90700SKai Jiang return sprintf(buf, "0x%llx\n", (unsigned long long)mem->addr & ~PAGE_MASK); 70e2b39df1SHans J. Koch } 71e2b39df1SHans J. Koch 72e70c412eSHans J. Koch struct map_sysfs_entry { 734f808bcdSBrandon Philips struct attribute attr; 744f808bcdSBrandon Philips ssize_t (*show)(struct uio_mem *, char *); 754f808bcdSBrandon Philips ssize_t (*store)(struct uio_mem *, const char *, size_t); 764f808bcdSBrandon Philips }; 774f808bcdSBrandon Philips 7882057791SHans J. Koch static struct map_sysfs_entry name_attribute = 7982057791SHans J. Koch __ATTR(name, S_IRUGO, map_name_show, NULL); 80e70c412eSHans J. Koch static struct map_sysfs_entry addr_attribute = 814f808bcdSBrandon Philips __ATTR(addr, S_IRUGO, map_addr_show, NULL); 82e70c412eSHans J. Koch static struct map_sysfs_entry size_attribute = 834f808bcdSBrandon Philips __ATTR(size, S_IRUGO, map_size_show, NULL); 84e70c412eSHans J. Koch static struct map_sysfs_entry offset_attribute = 85e2b39df1SHans J. Koch __ATTR(offset, S_IRUGO, map_offset_show, NULL); 86beafc54cSHans J. Koch 8781e7c6a6SGreg Kroah-Hartman static struct attribute *attrs[] = { 8882057791SHans J. Koch &name_attribute.attr, 894f808bcdSBrandon Philips &addr_attribute.attr, 9081e7c6a6SGreg Kroah-Hartman &size_attribute.attr, 91e2b39df1SHans J. Koch &offset_attribute.attr, 9281e7c6a6SGreg Kroah-Hartman NULL, /* need to NULL terminate the list of attributes */ 93beafc54cSHans J. Koch }; 94beafc54cSHans J. Koch 9581e7c6a6SGreg Kroah-Hartman static void map_release(struct kobject *kobj) 9681e7c6a6SGreg Kroah-Hartman { 9781e7c6a6SGreg Kroah-Hartman struct uio_map *map = to_map(kobj); 9881e7c6a6SGreg Kroah-Hartman kfree(map); 9981e7c6a6SGreg Kroah-Hartman } 10081e7c6a6SGreg Kroah-Hartman 1014f808bcdSBrandon Philips static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, 1024f808bcdSBrandon Philips char *buf) 1034f808bcdSBrandon Philips { 1044f808bcdSBrandon Philips struct uio_map *map = to_map(kobj); 1054f808bcdSBrandon Philips struct uio_mem *mem = map->mem; 106e70c412eSHans J. Koch struct map_sysfs_entry *entry; 1074f808bcdSBrandon Philips 108e70c412eSHans J. Koch entry = container_of(attr, struct map_sysfs_entry, attr); 1094f808bcdSBrandon Philips 1104f808bcdSBrandon Philips if (!entry->show) 1114f808bcdSBrandon Philips return -EIO; 1124f808bcdSBrandon Philips 1134f808bcdSBrandon Philips return entry->show(mem, buf); 1144f808bcdSBrandon Philips } 1154f808bcdSBrandon Philips 11652cf25d0SEmese Revfy static const struct sysfs_ops map_sysfs_ops = { 1174f808bcdSBrandon Philips .show = map_type_show, 1184f808bcdSBrandon Philips }; 1194f808bcdSBrandon Philips 120beafc54cSHans J. Koch static struct kobj_type map_attr_type = { 12181e7c6a6SGreg Kroah-Hartman .release = map_release, 122e70c412eSHans J. Koch .sysfs_ops = &map_sysfs_ops, 12381e7c6a6SGreg Kroah-Hartman .default_attrs = attrs, 124beafc54cSHans J. Koch }; 125beafc54cSHans J. Koch 126e70c412eSHans J. Koch struct uio_portio { 127e70c412eSHans J. Koch struct kobject kobj; 128e70c412eSHans J. Koch struct uio_port *port; 129e70c412eSHans J. Koch }; 130e70c412eSHans J. Koch #define to_portio(portio) container_of(portio, struct uio_portio, kobj) 131e70c412eSHans J. Koch 13282057791SHans J. Koch static ssize_t portio_name_show(struct uio_port *port, char *buf) 13382057791SHans J. Koch { 13482057791SHans J. Koch if (unlikely(!port->name)) 13582057791SHans J. Koch port->name = ""; 13682057791SHans J. Koch 13782057791SHans J. Koch return sprintf(buf, "%s\n", port->name); 13882057791SHans J. Koch } 13982057791SHans J. Koch 140e70c412eSHans J. Koch static ssize_t portio_start_show(struct uio_port *port, char *buf) 141e70c412eSHans J. Koch { 142e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->start); 143e70c412eSHans J. Koch } 144e70c412eSHans J. Koch 145e70c412eSHans J. Koch static ssize_t portio_size_show(struct uio_port *port, char *buf) 146e70c412eSHans J. Koch { 147e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->size); 148e70c412eSHans J. Koch } 149e70c412eSHans J. Koch 150e70c412eSHans J. Koch static ssize_t portio_porttype_show(struct uio_port *port, char *buf) 151e70c412eSHans J. Koch { 152e70c412eSHans J. Koch const char *porttypes[] = {"none", "x86", "gpio", "other"}; 153e70c412eSHans J. Koch 154e70c412eSHans J. Koch if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) 155e70c412eSHans J. Koch return -EINVAL; 156e70c412eSHans J. Koch 157e70c412eSHans J. Koch return sprintf(buf, "port_%s\n", porttypes[port->porttype]); 158e70c412eSHans J. Koch } 159e70c412eSHans J. Koch 160e70c412eSHans J. Koch struct portio_sysfs_entry { 161e70c412eSHans J. Koch struct attribute attr; 162e70c412eSHans J. Koch ssize_t (*show)(struct uio_port *, char *); 163e70c412eSHans J. Koch ssize_t (*store)(struct uio_port *, const char *, size_t); 164e70c412eSHans J. Koch }; 165e70c412eSHans J. Koch 16682057791SHans J. Koch static struct portio_sysfs_entry portio_name_attribute = 16782057791SHans J. Koch __ATTR(name, S_IRUGO, portio_name_show, NULL); 168e70c412eSHans J. Koch static struct portio_sysfs_entry portio_start_attribute = 169e70c412eSHans J. Koch __ATTR(start, S_IRUGO, portio_start_show, NULL); 170e70c412eSHans J. Koch static struct portio_sysfs_entry portio_size_attribute = 171e70c412eSHans J. Koch __ATTR(size, S_IRUGO, portio_size_show, NULL); 172e70c412eSHans J. Koch static struct portio_sysfs_entry portio_porttype_attribute = 173e70c412eSHans J. Koch __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); 174e70c412eSHans J. Koch 175e70c412eSHans J. Koch static struct attribute *portio_attrs[] = { 17682057791SHans J. Koch &portio_name_attribute.attr, 177e70c412eSHans J. Koch &portio_start_attribute.attr, 178e70c412eSHans J. Koch &portio_size_attribute.attr, 179e70c412eSHans J. Koch &portio_porttype_attribute.attr, 180e70c412eSHans J. Koch NULL, 181e70c412eSHans J. Koch }; 182e70c412eSHans J. Koch 183e70c412eSHans J. Koch static void portio_release(struct kobject *kobj) 184e70c412eSHans J. Koch { 185e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 186e70c412eSHans J. Koch kfree(portio); 187e70c412eSHans J. Koch } 188e70c412eSHans J. Koch 189e70c412eSHans J. Koch static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, 190e70c412eSHans J. Koch char *buf) 191e70c412eSHans J. Koch { 192e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 193e70c412eSHans J. Koch struct uio_port *port = portio->port; 194e70c412eSHans J. Koch struct portio_sysfs_entry *entry; 195e70c412eSHans J. Koch 196e70c412eSHans J. Koch entry = container_of(attr, struct portio_sysfs_entry, attr); 197e70c412eSHans J. Koch 198e70c412eSHans J. Koch if (!entry->show) 199e70c412eSHans J. Koch return -EIO; 200e70c412eSHans J. Koch 201e70c412eSHans J. Koch return entry->show(port, buf); 202e70c412eSHans J. Koch } 203e70c412eSHans J. Koch 20452cf25d0SEmese Revfy static const struct sysfs_ops portio_sysfs_ops = { 205e70c412eSHans J. Koch .show = portio_type_show, 206e70c412eSHans J. Koch }; 207e70c412eSHans J. Koch 208e70c412eSHans J. Koch static struct kobj_type portio_attr_type = { 209e70c412eSHans J. Koch .release = portio_release, 210e70c412eSHans J. Koch .sysfs_ops = &portio_sysfs_ops, 211e70c412eSHans J. Koch .default_attrs = portio_attrs, 212e70c412eSHans J. Koch }; 213e70c412eSHans J. Koch 214c9dce927SGreg Kroah-Hartman static ssize_t name_show(struct device *dev, 215beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 216beafc54cSHans J. Koch { 217beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 218beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->name); 219beafc54cSHans J. Koch } 220c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(name); 221beafc54cSHans J. Koch 222c9dce927SGreg Kroah-Hartman static ssize_t version_show(struct device *dev, 223beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 224beafc54cSHans J. Koch { 225beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 226beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->version); 227beafc54cSHans J. Koch } 228c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(version); 229beafc54cSHans J. Koch 230c9dce927SGreg Kroah-Hartman static ssize_t event_show(struct device *dev, 231beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 232beafc54cSHans J. Koch { 233beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 23470a9156bSEric W. Biederman return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); 235beafc54cSHans J. Koch } 236c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(event); 237beafc54cSHans J. Koch 238c9dce927SGreg Kroah-Hartman static struct attribute *uio_attrs[] = { 239c9dce927SGreg Kroah-Hartman &dev_attr_name.attr, 240c9dce927SGreg Kroah-Hartman &dev_attr_version.attr, 241c9dce927SGreg Kroah-Hartman &dev_attr_event.attr, 242c9dce927SGreg Kroah-Hartman NULL, 243beafc54cSHans J. Koch }; 244c9dce927SGreg Kroah-Hartman ATTRIBUTE_GROUPS(uio); 245beafc54cSHans J. Koch 246c66fdab6SEric W. Biederman /* UIO class infrastructure */ 247c66fdab6SEric W. Biederman static struct class uio_class = { 248c66fdab6SEric W. Biederman .name = "uio", 249c9dce927SGreg Kroah-Hartman .dev_groups = uio_groups, 250beafc54cSHans J. Koch }; 251beafc54cSHans J. Koch 252beafc54cSHans J. Koch /* 253beafc54cSHans J. Koch * device functions 254beafc54cSHans J. Koch */ 255beafc54cSHans J. Koch static int uio_dev_add_attributes(struct uio_device *idev) 256beafc54cSHans J. Koch { 257beafc54cSHans J. Koch int ret; 258e70c412eSHans J. Koch int mi, pi; 259beafc54cSHans J. Koch int map_found = 0; 260e70c412eSHans J. Koch int portio_found = 0; 261beafc54cSHans J. Koch struct uio_mem *mem; 26281e7c6a6SGreg Kroah-Hartman struct uio_map *map; 263e70c412eSHans J. Koch struct uio_port *port; 264e70c412eSHans J. Koch struct uio_portio *portio; 265beafc54cSHans J. Koch 266beafc54cSHans J. Koch for (mi = 0; mi < MAX_UIO_MAPS; mi++) { 267beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 268beafc54cSHans J. Koch if (mem->size == 0) 269beafc54cSHans J. Koch break; 270beafc54cSHans J. Koch if (!map_found) { 271beafc54cSHans J. Koch map_found = 1; 27281e7c6a6SGreg Kroah-Hartman idev->map_dir = kobject_create_and_add("maps", 27381e7c6a6SGreg Kroah-Hartman &idev->dev->kobj); 2740320a278SDan Carpenter if (!idev->map_dir) { 2750320a278SDan Carpenter ret = -ENOMEM; 276e70c412eSHans J. Koch goto err_map; 277beafc54cSHans J. Koch } 2780320a278SDan Carpenter } 27981e7c6a6SGreg Kroah-Hartman map = kzalloc(sizeof(*map), GFP_KERNEL); 2800320a278SDan Carpenter if (!map) { 2810320a278SDan Carpenter ret = -ENOMEM; 28275f0aef6SCong Ding goto err_map_kobj; 2830320a278SDan Carpenter } 284f9cb074bSGreg Kroah-Hartman kobject_init(&map->kobj, &map_attr_type); 28581e7c6a6SGreg Kroah-Hartman map->mem = mem; 28681e7c6a6SGreg Kroah-Hartman mem->map = map; 287b2d6db58SGreg Kroah-Hartman ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); 288beafc54cSHans J. Koch if (ret) 28975f0aef6SCong Ding goto err_map_kobj; 29081e7c6a6SGreg Kroah-Hartman ret = kobject_uevent(&map->kobj, KOBJ_ADD); 29181e7c6a6SGreg Kroah-Hartman if (ret) 292e70c412eSHans J. Koch goto err_map; 293e70c412eSHans J. Koch } 294e70c412eSHans J. Koch 295e70c412eSHans J. Koch for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { 296e70c412eSHans J. Koch port = &idev->info->port[pi]; 297e70c412eSHans J. Koch if (port->size == 0) 298e70c412eSHans J. Koch break; 299e70c412eSHans J. Koch if (!portio_found) { 300e70c412eSHans J. Koch portio_found = 1; 301e70c412eSHans J. Koch idev->portio_dir = kobject_create_and_add("portio", 302e70c412eSHans J. Koch &idev->dev->kobj); 3030320a278SDan Carpenter if (!idev->portio_dir) { 3040320a278SDan Carpenter ret = -ENOMEM; 305e70c412eSHans J. Koch goto err_portio; 306e70c412eSHans J. Koch } 3070320a278SDan Carpenter } 308e70c412eSHans J. Koch portio = kzalloc(sizeof(*portio), GFP_KERNEL); 3090320a278SDan Carpenter if (!portio) { 3100320a278SDan Carpenter ret = -ENOMEM; 31175f0aef6SCong Ding goto err_portio_kobj; 3120320a278SDan Carpenter } 313e70c412eSHans J. Koch kobject_init(&portio->kobj, &portio_attr_type); 314e70c412eSHans J. Koch portio->port = port; 315e70c412eSHans J. Koch port->portio = portio; 316e70c412eSHans J. Koch ret = kobject_add(&portio->kobj, idev->portio_dir, 317e70c412eSHans J. Koch "port%d", pi); 318e70c412eSHans J. Koch if (ret) 31975f0aef6SCong Ding goto err_portio_kobj; 320e70c412eSHans J. Koch ret = kobject_uevent(&portio->kobj, KOBJ_ADD); 321e70c412eSHans J. Koch if (ret) 322e70c412eSHans J. Koch goto err_portio; 323beafc54cSHans J. Koch } 324beafc54cSHans J. Koch 325beafc54cSHans J. Koch return 0; 326beafc54cSHans J. Koch 327e70c412eSHans J. Koch err_portio: 32875f0aef6SCong Ding pi--; 32975f0aef6SCong Ding err_portio_kobj: 33075f0aef6SCong Ding for (; pi >= 0; pi--) { 331e70c412eSHans J. Koch port = &idev->info->port[pi]; 332e70c412eSHans J. Koch portio = port->portio; 333e70c412eSHans J. Koch kobject_put(&portio->kobj); 334e70c412eSHans J. Koch } 335e70c412eSHans J. Koch kobject_put(idev->portio_dir); 336e70c412eSHans J. Koch err_map: 33775f0aef6SCong Ding mi--; 33875f0aef6SCong Ding err_map_kobj: 33975f0aef6SCong Ding for (; 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) { 535edce5e6fSMichal Hocko __set_current_state(TASK_RUNNING); 536beafc54cSHans J. Koch if (copy_to_user(buf, &event_count, count)) 537beafc54cSHans J. Koch retval = -EFAULT; 538beafc54cSHans J. Koch else { 539beafc54cSHans J. Koch listener->event_count = event_count; 540beafc54cSHans J. Koch retval = count; 541beafc54cSHans J. Koch } 542beafc54cSHans J. Koch break; 543beafc54cSHans J. Koch } 544beafc54cSHans J. Koch 545beafc54cSHans J. Koch if (filep->f_flags & O_NONBLOCK) { 546beafc54cSHans J. Koch retval = -EAGAIN; 547beafc54cSHans J. Koch break; 548beafc54cSHans J. Koch } 549beafc54cSHans J. Koch 550beafc54cSHans J. Koch if (signal_pending(current)) { 551beafc54cSHans J. Koch retval = -ERESTARTSYS; 552beafc54cSHans J. Koch break; 553beafc54cSHans J. Koch } 554beafc54cSHans J. Koch schedule(); 555beafc54cSHans J. Koch } while (1); 556beafc54cSHans J. Koch 557beafc54cSHans J. Koch __set_current_state(TASK_RUNNING); 558beafc54cSHans J. Koch remove_wait_queue(&idev->wait, &wait); 559beafc54cSHans J. Koch 560beafc54cSHans J. Koch return retval; 561beafc54cSHans J. Koch } 562beafc54cSHans J. Koch 563328a14e7SHans J. Koch static ssize_t uio_write(struct file *filep, const char __user *buf, 564328a14e7SHans J. Koch size_t count, loff_t *ppos) 565328a14e7SHans J. Koch { 566328a14e7SHans J. Koch struct uio_listener *listener = filep->private_data; 567328a14e7SHans J. Koch struct uio_device *idev = listener->dev; 568328a14e7SHans J. Koch ssize_t retval; 569328a14e7SHans J. Koch s32 irq_on; 570328a14e7SHans J. Koch 5716427a765SEric W. Biederman if (!idev->info->irq) 572328a14e7SHans J. Koch return -EIO; 573328a14e7SHans J. Koch 574328a14e7SHans J. Koch if (count != sizeof(s32)) 575328a14e7SHans J. Koch return -EINVAL; 576328a14e7SHans J. Koch 577328a14e7SHans J. Koch if (!idev->info->irqcontrol) 578328a14e7SHans J. Koch return -ENOSYS; 579328a14e7SHans J. Koch 580328a14e7SHans J. Koch if (copy_from_user(&irq_on, buf, count)) 581328a14e7SHans J. Koch return -EFAULT; 582328a14e7SHans J. Koch 583328a14e7SHans J. Koch retval = idev->info->irqcontrol(idev->info, irq_on); 584328a14e7SHans J. Koch 585328a14e7SHans J. Koch return retval ? retval : sizeof(s32); 586328a14e7SHans J. Koch } 587328a14e7SHans J. Koch 588beafc54cSHans J. Koch static int uio_find_mem_index(struct vm_area_struct *vma) 589beafc54cSHans J. Koch { 590beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 591beafc54cSHans J. Koch 592f0c554fdSHillf Danton if (vma->vm_pgoff < MAX_UIO_MAPS) { 593f0c554fdSHillf Danton if (idev->info->mem[vma->vm_pgoff].size == 0) 594beafc54cSHans J. Koch return -1; 595f0c554fdSHillf Danton return (int)vma->vm_pgoff; 596beafc54cSHans J. Koch } 597beafc54cSHans J. Koch return -1; 598beafc54cSHans J. Koch } 599beafc54cSHans J. Koch 600a18b630dSNick Piggin static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 601beafc54cSHans J. Koch { 602beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 603a18b630dSNick Piggin struct page *page; 60402683ffdSAndrew G. Harvey unsigned long offset; 605e6418fccSBen Hutchings void *addr; 606beafc54cSHans J. Koch 607beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 608beafc54cSHans J. Koch if (mi < 0) 609a18b630dSNick Piggin return VM_FAULT_SIGBUS; 610beafc54cSHans J. Koch 61102683ffdSAndrew G. Harvey /* 61202683ffdSAndrew G. Harvey * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 61302683ffdSAndrew G. Harvey * to use mem[N]. 61402683ffdSAndrew G. Harvey */ 61502683ffdSAndrew G. Harvey offset = (vmf->pgoff - mi) << PAGE_SHIFT; 61602683ffdSAndrew G. Harvey 617e6418fccSBen Hutchings addr = (void *)(unsigned long)idev->info->mem[mi].addr + offset; 618beafc54cSHans J. Koch if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) 619e6418fccSBen Hutchings page = virt_to_page(addr); 620beafc54cSHans J. Koch else 621e6418fccSBen Hutchings page = vmalloc_to_page(addr); 622beafc54cSHans J. Koch get_page(page); 623a18b630dSNick Piggin vmf->page = page; 624a18b630dSNick Piggin return 0; 625beafc54cSHans J. Koch } 626beafc54cSHans J. Koch 6277294151dSUwe Kleine-König static const struct vm_operations_struct uio_logical_vm_ops = { 628a18b630dSNick Piggin .fault = uio_vma_fault, 629beafc54cSHans J. Koch }; 630beafc54cSHans J. Koch 6317294151dSUwe Kleine-König static int uio_mmap_logical(struct vm_area_struct *vma) 6327294151dSUwe Kleine-König { 6337294151dSUwe Kleine-König vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 6347294151dSUwe Kleine-König vma->vm_ops = &uio_logical_vm_ops; 6357294151dSUwe Kleine-König return 0; 6367294151dSUwe Kleine-König } 6377294151dSUwe Kleine-König 6387294151dSUwe Kleine-König static const struct vm_operations_struct uio_physical_vm_ops = { 6397294151dSUwe Kleine-König #ifdef CONFIG_HAVE_IOREMAP_PROT 6407294151dSUwe Kleine-König .access = generic_access_phys, 6417294151dSUwe Kleine-König #endif 6427294151dSUwe Kleine-König }; 6437294151dSUwe Kleine-König 644beafc54cSHans J. Koch static int uio_mmap_physical(struct vm_area_struct *vma) 645beafc54cSHans J. Koch { 646beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 647beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 6487314e613SLinus Torvalds struct uio_mem *mem; 649beafc54cSHans J. Koch if (mi < 0) 650beafc54cSHans J. Koch return -EINVAL; 6517314e613SLinus Torvalds mem = idev->info->mem + mi; 6527314e613SLinus Torvalds 653b6550287SLinus Torvalds if (mem->addr & ~PAGE_MASK) 654b6550287SLinus Torvalds return -ENODEV; 655b29f680cSGreg Kroah-Hartman if (vma->vm_end - vma->vm_start > mem->size) 6567314e613SLinus Torvalds return -EINVAL; 657beafc54cSHans J. Koch 6587294151dSUwe Kleine-König vma->vm_ops = &uio_physical_vm_ops; 659c9698d6bSJean-Samuel Chenard vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 660c9698d6bSJean-Samuel Chenard 6617314e613SLinus Torvalds /* 6627314e613SLinus Torvalds * We cannot use the vm_iomap_memory() helper here, 6637314e613SLinus Torvalds * because vma->vm_pgoff is the map index we looked 6647314e613SLinus Torvalds * up above in uio_find_mem_index(), rather than an 6657314e613SLinus Torvalds * actual page offset into the mmap. 6667314e613SLinus Torvalds * 6677314e613SLinus Torvalds * So we just do the physical mmap without a page 6687314e613SLinus Torvalds * offset. 6697314e613SLinus Torvalds */ 670beafc54cSHans J. Koch return remap_pfn_range(vma, 671beafc54cSHans J. Koch vma->vm_start, 6727314e613SLinus Torvalds mem->addr >> PAGE_SHIFT, 673beafc54cSHans J. Koch vma->vm_end - vma->vm_start, 674beafc54cSHans J. Koch vma->vm_page_prot); 675beafc54cSHans J. Koch } 676beafc54cSHans J. Koch 677beafc54cSHans J. Koch static int uio_mmap(struct file *filep, struct vm_area_struct *vma) 678beafc54cSHans J. Koch { 679beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 680beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 681beafc54cSHans J. Koch int mi; 682beafc54cSHans J. Koch unsigned long requested_pages, actual_pages; 683beafc54cSHans J. Koch int ret = 0; 684beafc54cSHans J. Koch 685beafc54cSHans J. Koch if (vma->vm_end < vma->vm_start) 686beafc54cSHans J. Koch return -EINVAL; 687beafc54cSHans J. Koch 688beafc54cSHans J. Koch vma->vm_private_data = idev; 689beafc54cSHans J. Koch 690beafc54cSHans J. Koch mi = uio_find_mem_index(vma); 691beafc54cSHans J. Koch if (mi < 0) 692beafc54cSHans J. Koch return -EINVAL; 693beafc54cSHans J. Koch 69452c2dad9SLibin requested_pages = vma_pages(vma); 6956da2d377SIan Abbott actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) 6966da2d377SIan Abbott + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; 697beafc54cSHans J. Koch if (requested_pages > actual_pages) 698beafc54cSHans J. Koch return -EINVAL; 699beafc54cSHans J. Koch 700beafc54cSHans J. Koch if (idev->info->mmap) { 701beafc54cSHans J. Koch ret = idev->info->mmap(idev->info, vma); 702beafc54cSHans J. Koch return ret; 703beafc54cSHans J. Koch } 704beafc54cSHans J. Koch 705beafc54cSHans J. Koch switch (idev->info->mem[mi].memtype) { 706beafc54cSHans J. Koch case UIO_MEM_PHYS: 707beafc54cSHans J. Koch return uio_mmap_physical(vma); 708beafc54cSHans J. Koch case UIO_MEM_LOGICAL: 709beafc54cSHans J. Koch case UIO_MEM_VIRTUAL: 710beafc54cSHans J. Koch return uio_mmap_logical(vma); 711beafc54cSHans J. Koch default: 712beafc54cSHans J. Koch return -EINVAL; 713beafc54cSHans J. Koch } 714beafc54cSHans J. Koch } 715beafc54cSHans J. Koch 7164f014691SJan Engelhardt static const struct file_operations uio_fops = { 717beafc54cSHans J. Koch .owner = THIS_MODULE, 718beafc54cSHans J. Koch .open = uio_open, 719beafc54cSHans J. Koch .release = uio_release, 720beafc54cSHans J. Koch .read = uio_read, 721328a14e7SHans J. Koch .write = uio_write, 722beafc54cSHans J. Koch .mmap = uio_mmap, 723beafc54cSHans J. Koch .poll = uio_poll, 724beafc54cSHans J. Koch .fasync = uio_fasync, 7256038f373SArnd Bergmann .llseek = noop_llseek, 726beafc54cSHans J. Koch }; 727beafc54cSHans J. Koch 728beafc54cSHans J. Koch static int uio_major_init(void) 729beafc54cSHans J. Koch { 73091960a46SEric W. Biederman static const char name[] = "uio"; 73191960a46SEric W. Biederman struct cdev *cdev = NULL; 73291960a46SEric W. Biederman dev_t uio_dev = 0; 73391960a46SEric W. Biederman int result; 73491960a46SEric W. Biederman 73591960a46SEric W. Biederman result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); 73691960a46SEric W. Biederman if (result) 73791960a46SEric W. Biederman goto out; 73891960a46SEric W. Biederman 73991960a46SEric W. Biederman result = -ENOMEM; 74091960a46SEric W. Biederman cdev = cdev_alloc(); 74191960a46SEric W. Biederman if (!cdev) 74291960a46SEric W. Biederman goto out_unregister; 74391960a46SEric W. Biederman 74491960a46SEric W. Biederman cdev->owner = THIS_MODULE; 74591960a46SEric W. Biederman cdev->ops = &uio_fops; 74691960a46SEric W. Biederman kobject_set_name(&cdev->kobj, "%s", name); 74791960a46SEric W. Biederman 74891960a46SEric W. Biederman result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); 74991960a46SEric W. Biederman if (result) 75091960a46SEric W. Biederman goto out_put; 75191960a46SEric W. Biederman 75291960a46SEric W. Biederman uio_major = MAJOR(uio_dev); 75391960a46SEric W. Biederman uio_cdev = cdev; 754d80df1ceSWanlong Gao return 0; 75591960a46SEric W. Biederman out_put: 75691960a46SEric W. Biederman kobject_put(&cdev->kobj); 75791960a46SEric W. Biederman out_unregister: 75891960a46SEric W. Biederman unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); 759d80df1ceSWanlong Gao out: 760d80df1ceSWanlong Gao return result; 761beafc54cSHans J. Koch } 762beafc54cSHans J. Koch 763beafc54cSHans J. Koch static void uio_major_cleanup(void) 764beafc54cSHans J. Koch { 76591960a46SEric W. Biederman unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); 76691960a46SEric W. Biederman cdev_del(uio_cdev); 767beafc54cSHans J. Koch } 768beafc54cSHans J. Koch 769beafc54cSHans J. Koch static int init_uio_class(void) 770beafc54cSHans J. Koch { 7713d4f9d76SEric W. Biederman int ret; 772beafc54cSHans J. Koch 773beafc54cSHans J. Koch /* This is the first time in here, set everything up properly */ 774beafc54cSHans J. Koch ret = uio_major_init(); 775beafc54cSHans J. Koch if (ret) 776beafc54cSHans J. Koch goto exit; 777beafc54cSHans J. Koch 778c66fdab6SEric W. Biederman ret = class_register(&uio_class); 779c66fdab6SEric W. Biederman if (ret) { 780c66fdab6SEric W. Biederman printk(KERN_ERR "class_register failed for uio\n"); 781c66fdab6SEric W. Biederman goto err_class_register; 782beafc54cSHans J. Koch } 783beafc54cSHans J. Koch return 0; 784beafc54cSHans J. Koch 785c66fdab6SEric W. Biederman err_class_register: 786beafc54cSHans J. Koch uio_major_cleanup(); 787beafc54cSHans J. Koch exit: 788beafc54cSHans J. Koch return ret; 789beafc54cSHans J. Koch } 790beafc54cSHans J. Koch 7913d4f9d76SEric W. Biederman static void release_uio_class(void) 792beafc54cSHans J. Koch { 793c66fdab6SEric W. Biederman class_unregister(&uio_class); 794beafc54cSHans J. Koch uio_major_cleanup(); 795beafc54cSHans J. Koch } 796beafc54cSHans J. Koch 797beafc54cSHans J. Koch /** 798beafc54cSHans J. Koch * uio_register_device - register a new userspace IO device 799beafc54cSHans J. Koch * @owner: module that creates the new device 800beafc54cSHans J. Koch * @parent: parent device 801beafc54cSHans J. Koch * @info: UIO device capabilities 802beafc54cSHans J. Koch * 803beafc54cSHans J. Koch * returns zero on success or a negative error code. 804beafc54cSHans J. Koch */ 805beafc54cSHans J. Koch int __uio_register_device(struct module *owner, 806beafc54cSHans J. Koch struct device *parent, 807beafc54cSHans J. Koch struct uio_info *info) 808beafc54cSHans J. Koch { 809beafc54cSHans J. Koch struct uio_device *idev; 810beafc54cSHans J. Koch int ret = 0; 811beafc54cSHans J. Koch 812beafc54cSHans J. Koch if (!parent || !info || !info->name || !info->version) 813beafc54cSHans J. Koch return -EINVAL; 814beafc54cSHans J. Koch 815beafc54cSHans J. Koch info->uio_dev = NULL; 816beafc54cSHans J. Koch 817e6789cd3SMichal Simek idev = devm_kzalloc(parent, sizeof(*idev), GFP_KERNEL); 818beafc54cSHans J. Koch if (!idev) { 819e6789cd3SMichal Simek return -ENOMEM; 820beafc54cSHans J. Koch } 821beafc54cSHans J. Koch 822beafc54cSHans J. Koch idev->owner = owner; 823beafc54cSHans J. Koch idev->info = info; 824beafc54cSHans J. Koch init_waitqueue_head(&idev->wait); 825beafc54cSHans J. Koch atomic_set(&idev->event, 0); 826beafc54cSHans J. Koch 827beafc54cSHans J. Koch ret = uio_get_minor(idev); 828beafc54cSHans J. Koch if (ret) 829e6789cd3SMichal Simek return ret; 830beafc54cSHans J. Koch 831c66fdab6SEric W. Biederman idev->dev = device_create(&uio_class, parent, 83243691da4SGreg Kroah-Hartman MKDEV(uio_major, idev->minor), idev, 833beafc54cSHans J. Koch "uio%d", idev->minor); 834beafc54cSHans J. Koch if (IS_ERR(idev->dev)) { 835beafc54cSHans J. Koch printk(KERN_ERR "UIO: device register failed\n"); 836beafc54cSHans J. Koch ret = PTR_ERR(idev->dev); 837beafc54cSHans J. Koch goto err_device_create; 838beafc54cSHans J. Koch } 839beafc54cSHans J. Koch 840beafc54cSHans J. Koch ret = uio_dev_add_attributes(idev); 841beafc54cSHans J. Koch if (ret) 842beafc54cSHans J. Koch goto err_uio_dev_add_attributes; 843beafc54cSHans J. Koch 844beafc54cSHans J. Koch info->uio_dev = idev; 845beafc54cSHans J. Koch 8466427a765SEric W. Biederman if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { 847a087146cSBrian Russell /* 848a087146cSBrian Russell * Note that we deliberately don't use devm_request_irq 849a087146cSBrian Russell * here. The parent module can unregister the UIO device 850a087146cSBrian Russell * and call pci_disable_msi, which requires that this 851a087146cSBrian Russell * irq has been freed. However, the device may have open 852a087146cSBrian Russell * FDs at the time of unregister and therefore may not be 853a087146cSBrian Russell * freed until they are released. 854a087146cSBrian Russell */ 855a087146cSBrian Russell ret = request_irq(info->irq, uio_interrupt, 8566427a765SEric W. Biederman info->irq_flags, info->name, idev); 857beafc54cSHans J. Koch if (ret) 858beafc54cSHans J. Koch goto err_request_irq; 859beafc54cSHans J. Koch } 860beafc54cSHans J. Koch 861beafc54cSHans J. Koch return 0; 862beafc54cSHans J. Koch 863beafc54cSHans J. Koch err_request_irq: 864beafc54cSHans J. Koch uio_dev_del_attributes(idev); 865beafc54cSHans J. Koch err_uio_dev_add_attributes: 866c66fdab6SEric W. Biederman device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); 867beafc54cSHans J. Koch err_device_create: 868beafc54cSHans J. Koch uio_free_minor(idev); 869beafc54cSHans J. Koch return ret; 870beafc54cSHans J. Koch } 871beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(__uio_register_device); 872beafc54cSHans J. Koch 873beafc54cSHans J. Koch /** 874beafc54cSHans J. Koch * uio_unregister_device - unregister a industrial IO device 875beafc54cSHans J. Koch * @info: UIO device capabilities 876beafc54cSHans J. Koch * 877beafc54cSHans J. Koch */ 878beafc54cSHans J. Koch void uio_unregister_device(struct uio_info *info) 879beafc54cSHans J. Koch { 880beafc54cSHans J. Koch struct uio_device *idev; 881beafc54cSHans J. Koch 882beafc54cSHans J. Koch if (!info || !info->uio_dev) 883beafc54cSHans J. Koch return; 884beafc54cSHans J. Koch 885beafc54cSHans J. Koch idev = info->uio_dev; 886beafc54cSHans J. Koch 887beafc54cSHans J. Koch uio_free_minor(idev); 888beafc54cSHans J. Koch 889beafc54cSHans J. Koch uio_dev_del_attributes(idev); 890beafc54cSHans J. Koch 8919ff2c132SStephen Hemminger if (info->irq && info->irq != UIO_IRQ_CUSTOM) 8929ff2c132SStephen Hemminger free_irq(info->irq, idev); 893a087146cSBrian Russell 894c66fdab6SEric W. Biederman device_destroy(&uio_class, MKDEV(uio_major, idev->minor)); 895beafc54cSHans J. Koch 896beafc54cSHans J. Koch return; 897beafc54cSHans J. Koch } 898beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_unregister_device); 899beafc54cSHans J. Koch 900beafc54cSHans J. Koch static int __init uio_init(void) 901beafc54cSHans J. Koch { 9023d4f9d76SEric W. Biederman return init_uio_class(); 903beafc54cSHans J. Koch } 904beafc54cSHans J. Koch 905beafc54cSHans J. Koch static void __exit uio_exit(void) 906beafc54cSHans J. Koch { 9073d4f9d76SEric W. Biederman release_uio_class(); 908e2ef9393SJohannes Thumshirn idr_destroy(&uio_idr); 909beafc54cSHans J. Koch } 910beafc54cSHans J. Koch 911beafc54cSHans J. Koch module_init(uio_init) 912beafc54cSHans J. Koch module_exit(uio_exit) 913beafc54cSHans J. Koch MODULE_LICENSE("GPL v2"); 914