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> 6beafc54cSHans J. Koch * Copyright(C) 2006, Hans J. Koch <hjk@linutronix.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> 26beafc54cSHans J. Koch #include <linux/uio_driver.h> 27beafc54cSHans J. Koch 28beafc54cSHans J. Koch #define UIO_MAX_DEVICES 255 29beafc54cSHans J. Koch 30beafc54cSHans J. Koch struct uio_device { 31beafc54cSHans J. Koch struct module *owner; 32beafc54cSHans J. Koch struct device *dev; 33beafc54cSHans J. Koch int minor; 34beafc54cSHans J. Koch atomic_t event; 35beafc54cSHans J. Koch struct fasync_struct *async_queue; 36beafc54cSHans J. Koch wait_queue_head_t wait; 37beafc54cSHans J. Koch int vma_count; 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; 44beafc54cSHans J. Koch static DEFINE_IDR(uio_idr); 454f014691SJan Engelhardt static const struct file_operations uio_fops; 46beafc54cSHans J. Koch 47beafc54cSHans J. Koch /* UIO class infrastructure */ 483d4f9d76SEric W. Biederman static struct class *uio_class; 49beafc54cSHans J. Koch 500d4a7bc1SJonathan Corbet /* Protect idr accesses */ 510d4a7bc1SJonathan Corbet static DEFINE_MUTEX(minor_lock); 520d4a7bc1SJonathan Corbet 53beafc54cSHans J. Koch /* 54beafc54cSHans J. Koch * attributes 55beafc54cSHans J. Koch */ 56beafc54cSHans J. Koch 5781e7c6a6SGreg Kroah-Hartman struct uio_map { 5881e7c6a6SGreg Kroah-Hartman struct kobject kobj; 5981e7c6a6SGreg Kroah-Hartman struct uio_mem *mem; 60beafc54cSHans J. Koch }; 6181e7c6a6SGreg Kroah-Hartman #define to_map(map) container_of(map, struct uio_map, kobj) 62beafc54cSHans J. Koch 6382057791SHans J. Koch static ssize_t map_name_show(struct uio_mem *mem, char *buf) 6482057791SHans J. Koch { 6582057791SHans J. Koch if (unlikely(!mem->name)) 6682057791SHans J. Koch mem->name = ""; 6782057791SHans J. Koch 6882057791SHans J. Koch return sprintf(buf, "%s\n", mem->name); 6982057791SHans J. Koch } 7082057791SHans J. Koch 714f808bcdSBrandon Philips static ssize_t map_addr_show(struct uio_mem *mem, char *buf) 72beafc54cSHans J. Koch { 73beafc54cSHans J. Koch return sprintf(buf, "0x%lx\n", mem->addr); 74beafc54cSHans J. Koch } 75beafc54cSHans J. Koch 764f808bcdSBrandon Philips static ssize_t map_size_show(struct uio_mem *mem, char *buf) 774f808bcdSBrandon Philips { 784f808bcdSBrandon Philips return sprintf(buf, "0x%lx\n", mem->size); 794f808bcdSBrandon Philips } 804f808bcdSBrandon Philips 81e2b39df1SHans J. Koch static ssize_t map_offset_show(struct uio_mem *mem, char *buf) 82e2b39df1SHans J. Koch { 83e2b39df1SHans J. Koch return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK); 84e2b39df1SHans J. Koch } 85e2b39df1SHans J. Koch 86e70c412eSHans J. Koch struct map_sysfs_entry { 874f808bcdSBrandon Philips struct attribute attr; 884f808bcdSBrandon Philips ssize_t (*show)(struct uio_mem *, char *); 894f808bcdSBrandon Philips ssize_t (*store)(struct uio_mem *, const char *, size_t); 904f808bcdSBrandon Philips }; 914f808bcdSBrandon Philips 9282057791SHans J. Koch static struct map_sysfs_entry name_attribute = 9382057791SHans J. Koch __ATTR(name, S_IRUGO, map_name_show, NULL); 94e70c412eSHans J. Koch static struct map_sysfs_entry addr_attribute = 954f808bcdSBrandon Philips __ATTR(addr, S_IRUGO, map_addr_show, NULL); 96e70c412eSHans J. Koch static struct map_sysfs_entry size_attribute = 974f808bcdSBrandon Philips __ATTR(size, S_IRUGO, map_size_show, NULL); 98e70c412eSHans J. Koch static struct map_sysfs_entry offset_attribute = 99e2b39df1SHans J. Koch __ATTR(offset, S_IRUGO, map_offset_show, NULL); 100beafc54cSHans J. Koch 10181e7c6a6SGreg Kroah-Hartman static struct attribute *attrs[] = { 10282057791SHans J. Koch &name_attribute.attr, 1034f808bcdSBrandon Philips &addr_attribute.attr, 10481e7c6a6SGreg Kroah-Hartman &size_attribute.attr, 105e2b39df1SHans J. Koch &offset_attribute.attr, 10681e7c6a6SGreg Kroah-Hartman NULL, /* need to NULL terminate the list of attributes */ 107beafc54cSHans J. Koch }; 108beafc54cSHans J. Koch 10981e7c6a6SGreg Kroah-Hartman static void map_release(struct kobject *kobj) 11081e7c6a6SGreg Kroah-Hartman { 11181e7c6a6SGreg Kroah-Hartman struct uio_map *map = to_map(kobj); 11281e7c6a6SGreg Kroah-Hartman kfree(map); 11381e7c6a6SGreg Kroah-Hartman } 11481e7c6a6SGreg Kroah-Hartman 1154f808bcdSBrandon Philips static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, 1164f808bcdSBrandon Philips char *buf) 1174f808bcdSBrandon Philips { 1184f808bcdSBrandon Philips struct uio_map *map = to_map(kobj); 1194f808bcdSBrandon Philips struct uio_mem *mem = map->mem; 120e70c412eSHans J. Koch struct map_sysfs_entry *entry; 1214f808bcdSBrandon Philips 122e70c412eSHans J. Koch entry = container_of(attr, struct map_sysfs_entry, attr); 1234f808bcdSBrandon Philips 1244f808bcdSBrandon Philips if (!entry->show) 1254f808bcdSBrandon Philips return -EIO; 1264f808bcdSBrandon Philips 1274f808bcdSBrandon Philips return entry->show(mem, buf); 1284f808bcdSBrandon Philips } 1294f808bcdSBrandon Philips 13052cf25d0SEmese Revfy static const struct sysfs_ops map_sysfs_ops = { 1314f808bcdSBrandon Philips .show = map_type_show, 1324f808bcdSBrandon Philips }; 1334f808bcdSBrandon Philips 134beafc54cSHans J. Koch static struct kobj_type map_attr_type = { 13581e7c6a6SGreg Kroah-Hartman .release = map_release, 136e70c412eSHans J. Koch .sysfs_ops = &map_sysfs_ops, 13781e7c6a6SGreg Kroah-Hartman .default_attrs = attrs, 138beafc54cSHans J. Koch }; 139beafc54cSHans J. Koch 140e70c412eSHans J. Koch struct uio_portio { 141e70c412eSHans J. Koch struct kobject kobj; 142e70c412eSHans J. Koch struct uio_port *port; 143e70c412eSHans J. Koch }; 144e70c412eSHans J. Koch #define to_portio(portio) container_of(portio, struct uio_portio, kobj) 145e70c412eSHans J. Koch 14682057791SHans J. Koch static ssize_t portio_name_show(struct uio_port *port, char *buf) 14782057791SHans J. Koch { 14882057791SHans J. Koch if (unlikely(!port->name)) 14982057791SHans J. Koch port->name = ""; 15082057791SHans J. Koch 15182057791SHans J. Koch return sprintf(buf, "%s\n", port->name); 15282057791SHans J. Koch } 15382057791SHans J. Koch 154e70c412eSHans J. Koch static ssize_t portio_start_show(struct uio_port *port, char *buf) 155e70c412eSHans J. Koch { 156e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->start); 157e70c412eSHans J. Koch } 158e70c412eSHans J. Koch 159e70c412eSHans J. Koch static ssize_t portio_size_show(struct uio_port *port, char *buf) 160e70c412eSHans J. Koch { 161e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->size); 162e70c412eSHans J. Koch } 163e70c412eSHans J. Koch 164e70c412eSHans J. Koch static ssize_t portio_porttype_show(struct uio_port *port, char *buf) 165e70c412eSHans J. Koch { 166e70c412eSHans J. Koch const char *porttypes[] = {"none", "x86", "gpio", "other"}; 167e70c412eSHans J. Koch 168e70c412eSHans J. Koch if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) 169e70c412eSHans J. Koch return -EINVAL; 170e70c412eSHans J. Koch 171e70c412eSHans J. Koch return sprintf(buf, "port_%s\n", porttypes[port->porttype]); 172e70c412eSHans J. Koch } 173e70c412eSHans J. Koch 174e70c412eSHans J. Koch struct portio_sysfs_entry { 175e70c412eSHans J. Koch struct attribute attr; 176e70c412eSHans J. Koch ssize_t (*show)(struct uio_port *, char *); 177e70c412eSHans J. Koch ssize_t (*store)(struct uio_port *, const char *, size_t); 178e70c412eSHans J. Koch }; 179e70c412eSHans J. Koch 18082057791SHans J. Koch static struct portio_sysfs_entry portio_name_attribute = 18182057791SHans J. Koch __ATTR(name, S_IRUGO, portio_name_show, NULL); 182e70c412eSHans J. Koch static struct portio_sysfs_entry portio_start_attribute = 183e70c412eSHans J. Koch __ATTR(start, S_IRUGO, portio_start_show, NULL); 184e70c412eSHans J. Koch static struct portio_sysfs_entry portio_size_attribute = 185e70c412eSHans J. Koch __ATTR(size, S_IRUGO, portio_size_show, NULL); 186e70c412eSHans J. Koch static struct portio_sysfs_entry portio_porttype_attribute = 187e70c412eSHans J. Koch __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); 188e70c412eSHans J. Koch 189e70c412eSHans J. Koch static struct attribute *portio_attrs[] = { 19082057791SHans J. Koch &portio_name_attribute.attr, 191e70c412eSHans J. Koch &portio_start_attribute.attr, 192e70c412eSHans J. Koch &portio_size_attribute.attr, 193e70c412eSHans J. Koch &portio_porttype_attribute.attr, 194e70c412eSHans J. Koch NULL, 195e70c412eSHans J. Koch }; 196e70c412eSHans J. Koch 197e70c412eSHans J. Koch static void portio_release(struct kobject *kobj) 198e70c412eSHans J. Koch { 199e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 200e70c412eSHans J. Koch kfree(portio); 201e70c412eSHans J. Koch } 202e70c412eSHans J. Koch 203e70c412eSHans J. Koch static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, 204e70c412eSHans J. Koch char *buf) 205e70c412eSHans J. Koch { 206e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 207e70c412eSHans J. Koch struct uio_port *port = portio->port; 208e70c412eSHans J. Koch struct portio_sysfs_entry *entry; 209e70c412eSHans J. Koch 210e70c412eSHans J. Koch entry = container_of(attr, struct portio_sysfs_entry, attr); 211e70c412eSHans J. Koch 212e70c412eSHans J. Koch if (!entry->show) 213e70c412eSHans J. Koch return -EIO; 214e70c412eSHans J. Koch 215e70c412eSHans J. Koch return entry->show(port, buf); 216e70c412eSHans J. Koch } 217e70c412eSHans J. Koch 21852cf25d0SEmese Revfy static const struct sysfs_ops portio_sysfs_ops = { 219e70c412eSHans J. Koch .show = portio_type_show, 220e70c412eSHans J. Koch }; 221e70c412eSHans J. Koch 222e70c412eSHans J. Koch static struct kobj_type portio_attr_type = { 223e70c412eSHans J. Koch .release = portio_release, 224e70c412eSHans J. Koch .sysfs_ops = &portio_sysfs_ops, 225e70c412eSHans J. Koch .default_attrs = portio_attrs, 226e70c412eSHans J. Koch }; 227e70c412eSHans J. Koch 228beafc54cSHans J. Koch static ssize_t show_name(struct device *dev, 229beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 230beafc54cSHans J. Koch { 231beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 232beafc54cSHans J. Koch if (idev) 233beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->name); 234beafc54cSHans J. Koch else 235beafc54cSHans J. Koch return -ENODEV; 236beafc54cSHans J. Koch } 237beafc54cSHans J. Koch static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 238beafc54cSHans J. Koch 239beafc54cSHans J. Koch static ssize_t show_version(struct device *dev, 240beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 241beafc54cSHans J. Koch { 242beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 243beafc54cSHans J. Koch if (idev) 244beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->version); 245beafc54cSHans J. Koch else 246beafc54cSHans J. Koch return -ENODEV; 247beafc54cSHans J. Koch } 248beafc54cSHans J. Koch static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 249beafc54cSHans J. Koch 250beafc54cSHans J. Koch static ssize_t show_event(struct device *dev, 251beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 252beafc54cSHans J. Koch { 253beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 254beafc54cSHans J. Koch if (idev) 255beafc54cSHans J. Koch return sprintf(buf, "%u\n", 256beafc54cSHans J. Koch (unsigned int)atomic_read(&idev->event)); 257beafc54cSHans J. Koch else 258beafc54cSHans J. Koch return -ENODEV; 259beafc54cSHans J. Koch } 260beafc54cSHans J. Koch static DEVICE_ATTR(event, S_IRUGO, show_event, NULL); 261beafc54cSHans J. Koch 262beafc54cSHans J. Koch static struct attribute *uio_attrs[] = { 263beafc54cSHans J. Koch &dev_attr_name.attr, 264beafc54cSHans J. Koch &dev_attr_version.attr, 265beafc54cSHans J. Koch &dev_attr_event.attr, 266beafc54cSHans J. Koch NULL, 267beafc54cSHans J. Koch }; 268beafc54cSHans J. Koch 269beafc54cSHans J. Koch static struct attribute_group uio_attr_grp = { 270beafc54cSHans J. Koch .attrs = uio_attrs, 271beafc54cSHans J. Koch }; 272beafc54cSHans J. Koch 273beafc54cSHans J. Koch /* 274beafc54cSHans J. Koch * device functions 275beafc54cSHans J. Koch */ 276beafc54cSHans J. Koch static int uio_dev_add_attributes(struct uio_device *idev) 277beafc54cSHans J. Koch { 278beafc54cSHans J. Koch int ret; 279e70c412eSHans J. Koch int mi, pi; 280beafc54cSHans J. Koch int map_found = 0; 281e70c412eSHans J. Koch int portio_found = 0; 282beafc54cSHans J. Koch struct uio_mem *mem; 28381e7c6a6SGreg Kroah-Hartman struct uio_map *map; 284e70c412eSHans J. Koch struct uio_port *port; 285e70c412eSHans J. Koch struct uio_portio *portio; 286beafc54cSHans J. Koch 287beafc54cSHans J. Koch ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp); 288beafc54cSHans J. Koch if (ret) 289beafc54cSHans J. Koch goto err_group; 290beafc54cSHans J. Koch 291beafc54cSHans J. Koch for (mi = 0; mi < MAX_UIO_MAPS; mi++) { 292beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 293beafc54cSHans J. Koch if (mem->size == 0) 294beafc54cSHans J. Koch break; 295beafc54cSHans J. Koch if (!map_found) { 296beafc54cSHans J. Koch map_found = 1; 29781e7c6a6SGreg Kroah-Hartman idev->map_dir = kobject_create_and_add("maps", 29881e7c6a6SGreg Kroah-Hartman &idev->dev->kobj); 29981e7c6a6SGreg Kroah-Hartman if (!idev->map_dir) 300e70c412eSHans J. Koch goto err_map; 301beafc54cSHans J. Koch } 30281e7c6a6SGreg Kroah-Hartman map = kzalloc(sizeof(*map), GFP_KERNEL); 30381e7c6a6SGreg Kroah-Hartman if (!map) 304e70c412eSHans J. Koch goto err_map; 305f9cb074bSGreg Kroah-Hartman kobject_init(&map->kobj, &map_attr_type); 30681e7c6a6SGreg Kroah-Hartman map->mem = mem; 30781e7c6a6SGreg Kroah-Hartman mem->map = map; 308b2d6db58SGreg Kroah-Hartman ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); 309beafc54cSHans J. Koch if (ret) 310e70c412eSHans J. Koch goto err_map; 31181e7c6a6SGreg Kroah-Hartman ret = kobject_uevent(&map->kobj, KOBJ_ADD); 31281e7c6a6SGreg Kroah-Hartman if (ret) 313e70c412eSHans J. Koch goto err_map; 314e70c412eSHans J. Koch } 315e70c412eSHans J. Koch 316e70c412eSHans J. Koch for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { 317e70c412eSHans J. Koch port = &idev->info->port[pi]; 318e70c412eSHans J. Koch if (port->size == 0) 319e70c412eSHans J. Koch break; 320e70c412eSHans J. Koch if (!portio_found) { 321e70c412eSHans J. Koch portio_found = 1; 322e70c412eSHans J. Koch idev->portio_dir = kobject_create_and_add("portio", 323e70c412eSHans J. Koch &idev->dev->kobj); 324e70c412eSHans J. Koch if (!idev->portio_dir) 325e70c412eSHans J. Koch goto err_portio; 326e70c412eSHans J. Koch } 327e70c412eSHans J. Koch portio = kzalloc(sizeof(*portio), GFP_KERNEL); 328e70c412eSHans J. Koch if (!portio) 329e70c412eSHans J. Koch goto err_portio; 330e70c412eSHans J. Koch kobject_init(&portio->kobj, &portio_attr_type); 331e70c412eSHans J. Koch portio->port = port; 332e70c412eSHans J. Koch port->portio = portio; 333e70c412eSHans J. Koch ret = kobject_add(&portio->kobj, idev->portio_dir, 334e70c412eSHans J. Koch "port%d", pi); 335e70c412eSHans J. Koch if (ret) 336e70c412eSHans J. Koch goto err_portio; 337e70c412eSHans J. Koch ret = kobject_uevent(&portio->kobj, KOBJ_ADD); 338e70c412eSHans J. Koch if (ret) 339e70c412eSHans J. Koch goto err_portio; 340beafc54cSHans J. Koch } 341beafc54cSHans J. Koch 342beafc54cSHans J. Koch return 0; 343beafc54cSHans J. Koch 344e70c412eSHans J. Koch err_portio: 345e70c412eSHans J. Koch for (pi--; pi >= 0; pi--) { 346e70c412eSHans J. Koch port = &idev->info->port[pi]; 347e70c412eSHans J. Koch portio = port->portio; 348e70c412eSHans J. Koch kobject_put(&portio->kobj); 349e70c412eSHans J. Koch } 350e70c412eSHans J. Koch kobject_put(idev->portio_dir); 351e70c412eSHans J. Koch err_map: 352beafc54cSHans J. Koch for (mi--; mi>=0; mi--) { 353beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 35481e7c6a6SGreg Kroah-Hartman map = mem->map; 355c10997f6SGreg Kroah-Hartman kobject_put(&map->kobj); 356beafc54cSHans J. Koch } 357c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 358beafc54cSHans J. Koch sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); 359beafc54cSHans J. Koch err_group: 360beafc54cSHans J. Koch dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); 361beafc54cSHans J. Koch return ret; 362beafc54cSHans J. Koch } 363beafc54cSHans J. Koch 364beafc54cSHans J. Koch static void uio_dev_del_attributes(struct uio_device *idev) 365beafc54cSHans J. Koch { 366e70c412eSHans J. Koch int i; 367beafc54cSHans J. Koch struct uio_mem *mem; 368e70c412eSHans J. Koch struct uio_port *port; 369e70c412eSHans J. Koch 370e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_MAPS; i++) { 371e70c412eSHans J. Koch mem = &idev->info->mem[i]; 372beafc54cSHans J. Koch if (mem->size == 0) 373beafc54cSHans J. Koch break; 374c10997f6SGreg Kroah-Hartman kobject_put(&mem->map->kobj); 375beafc54cSHans J. Koch } 376c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 377e70c412eSHans J. Koch 378e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { 379e70c412eSHans J. Koch port = &idev->info->port[i]; 380e70c412eSHans J. Koch if (port->size == 0) 381e70c412eSHans J. Koch break; 382e70c412eSHans J. Koch kobject_put(&port->portio->kobj); 383e70c412eSHans J. Koch } 384e70c412eSHans J. Koch kobject_put(idev->portio_dir); 385e70c412eSHans J. Koch 386beafc54cSHans J. Koch sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); 387beafc54cSHans J. Koch } 388beafc54cSHans J. Koch 389beafc54cSHans J. Koch static int uio_get_minor(struct uio_device *idev) 390beafc54cSHans J. Koch { 391beafc54cSHans J. Koch int retval = -ENOMEM; 392beafc54cSHans J. Koch int id; 393beafc54cSHans J. Koch 394beafc54cSHans J. Koch mutex_lock(&minor_lock); 395beafc54cSHans J. Koch if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0) 396beafc54cSHans J. Koch goto exit; 397beafc54cSHans J. Koch 398beafc54cSHans J. Koch retval = idr_get_new(&uio_idr, idev, &id); 399beafc54cSHans J. Koch if (retval < 0) { 400beafc54cSHans J. Koch if (retval == -EAGAIN) 401beafc54cSHans J. Koch retval = -ENOMEM; 402beafc54cSHans J. Koch goto exit; 403beafc54cSHans J. Koch } 404beafc54cSHans J. Koch idev->minor = id & MAX_ID_MASK; 405beafc54cSHans J. Koch exit: 406beafc54cSHans J. Koch mutex_unlock(&minor_lock); 407beafc54cSHans J. Koch return retval; 408beafc54cSHans J. Koch } 409beafc54cSHans J. Koch 410beafc54cSHans J. Koch static void uio_free_minor(struct uio_device *idev) 411beafc54cSHans J. Koch { 4120d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 413beafc54cSHans J. Koch idr_remove(&uio_idr, idev->minor); 4140d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 415beafc54cSHans J. Koch } 416beafc54cSHans J. Koch 417beafc54cSHans J. Koch /** 418beafc54cSHans J. Koch * uio_event_notify - trigger an interrupt event 419beafc54cSHans J. Koch * @info: UIO device capabilities 420beafc54cSHans J. Koch */ 421beafc54cSHans J. Koch void uio_event_notify(struct uio_info *info) 422beafc54cSHans J. Koch { 423beafc54cSHans J. Koch struct uio_device *idev = info->uio_dev; 424beafc54cSHans J. Koch 425beafc54cSHans J. Koch atomic_inc(&idev->event); 426beafc54cSHans J. Koch wake_up_interruptible(&idev->wait); 427beafc54cSHans J. Koch kill_fasync(&idev->async_queue, SIGIO, POLL_IN); 428beafc54cSHans J. Koch } 429beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_event_notify); 430beafc54cSHans J. Koch 431beafc54cSHans J. Koch /** 432beafc54cSHans J. Koch * uio_interrupt - hardware interrupt handler 433beafc54cSHans J. Koch * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer 434beafc54cSHans J. Koch * @dev_id: Pointer to the devices uio_device structure 435beafc54cSHans J. Koch */ 436beafc54cSHans J. Koch static irqreturn_t uio_interrupt(int irq, void *dev_id) 437beafc54cSHans J. Koch { 438beafc54cSHans J. Koch struct uio_device *idev = (struct uio_device *)dev_id; 439beafc54cSHans J. Koch irqreturn_t ret = idev->info->handler(irq, idev->info); 440beafc54cSHans J. Koch 441beafc54cSHans J. Koch if (ret == IRQ_HANDLED) 442beafc54cSHans J. Koch uio_event_notify(idev->info); 443beafc54cSHans J. Koch 444beafc54cSHans J. Koch return ret; 445beafc54cSHans J. Koch } 446beafc54cSHans J. Koch 447beafc54cSHans J. Koch struct uio_listener { 448beafc54cSHans J. Koch struct uio_device *dev; 449beafc54cSHans J. Koch s32 event_count; 450beafc54cSHans J. Koch }; 451beafc54cSHans J. Koch 452beafc54cSHans J. Koch static int uio_open(struct inode *inode, struct file *filep) 453beafc54cSHans J. Koch { 454beafc54cSHans J. Koch struct uio_device *idev; 455beafc54cSHans J. Koch struct uio_listener *listener; 456beafc54cSHans J. Koch int ret = 0; 457beafc54cSHans J. Koch 4580d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 459beafc54cSHans J. Koch idev = idr_find(&uio_idr, iminor(inode)); 4600d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 461fbc8a81dSJonathan Corbet if (!idev) { 462fbc8a81dSJonathan Corbet ret = -ENODEV; 463fbc8a81dSJonathan Corbet goto out; 464fbc8a81dSJonathan Corbet } 465beafc54cSHans J. Koch 466fbc8a81dSJonathan Corbet if (!try_module_get(idev->owner)) { 467fbc8a81dSJonathan Corbet ret = -ENODEV; 468fbc8a81dSJonathan Corbet goto out; 469fbc8a81dSJonathan Corbet } 470610ad506SUwe Kleine-König 471beafc54cSHans J. Koch listener = kmalloc(sizeof(*listener), GFP_KERNEL); 472610ad506SUwe Kleine-König if (!listener) { 473610ad506SUwe Kleine-König ret = -ENOMEM; 474610ad506SUwe Kleine-König goto err_alloc_listener; 475610ad506SUwe Kleine-König } 476beafc54cSHans J. Koch 477beafc54cSHans J. Koch listener->dev = idev; 478beafc54cSHans J. Koch listener->event_count = atomic_read(&idev->event); 479beafc54cSHans J. Koch filep->private_data = listener; 480beafc54cSHans J. Koch 481beafc54cSHans J. Koch if (idev->info->open) { 482beafc54cSHans J. Koch ret = idev->info->open(idev->info, inode); 483610ad506SUwe Kleine-König if (ret) 484610ad506SUwe Kleine-König goto err_infoopen; 485beafc54cSHans J. Koch } 486610ad506SUwe Kleine-König return 0; 487610ad506SUwe Kleine-König 488610ad506SUwe Kleine-König err_infoopen: 489beafc54cSHans J. Koch kfree(listener); 490610ad506SUwe Kleine-König 4910d4a7bc1SJonathan Corbet err_alloc_listener: 492610ad506SUwe Kleine-König module_put(idev->owner); 493beafc54cSHans J. Koch 494fbc8a81dSJonathan Corbet out: 495beafc54cSHans J. Koch return ret; 496beafc54cSHans J. Koch } 497beafc54cSHans J. Koch 498beafc54cSHans J. Koch static int uio_fasync(int fd, struct file *filep, int on) 499beafc54cSHans J. Koch { 500beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 501beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 502beafc54cSHans J. Koch 503beafc54cSHans J. Koch return fasync_helper(fd, filep, on, &idev->async_queue); 504beafc54cSHans J. Koch } 505beafc54cSHans J. Koch 506beafc54cSHans J. Koch static int uio_release(struct inode *inode, struct file *filep) 507beafc54cSHans J. Koch { 508beafc54cSHans J. Koch int ret = 0; 509beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 510beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 511beafc54cSHans J. Koch 512610ad506SUwe Kleine-König if (idev->info->release) 513beafc54cSHans J. Koch ret = idev->info->release(idev->info, inode); 514610ad506SUwe Kleine-König 515beafc54cSHans J. Koch module_put(idev->owner); 516beafc54cSHans J. Koch kfree(listener); 517beafc54cSHans J. Koch return ret; 518beafc54cSHans J. Koch } 519beafc54cSHans J. Koch 520beafc54cSHans J. Koch static unsigned int uio_poll(struct file *filep, poll_table *wait) 521beafc54cSHans J. Koch { 522beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 523beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 524beafc54cSHans J. Koch 525beafc54cSHans J. Koch if (idev->info->irq == UIO_IRQ_NONE) 526beafc54cSHans J. Koch return -EIO; 527beafc54cSHans J. Koch 528beafc54cSHans J. Koch poll_wait(filep, &idev->wait, wait); 529beafc54cSHans J. Koch if (listener->event_count != atomic_read(&idev->event)) 530beafc54cSHans J. Koch return POLLIN | POLLRDNORM; 531beafc54cSHans J. Koch return 0; 532beafc54cSHans J. Koch } 533beafc54cSHans J. Koch 534beafc54cSHans J. Koch static ssize_t uio_read(struct file *filep, char __user *buf, 535beafc54cSHans J. Koch size_t count, loff_t *ppos) 536beafc54cSHans J. Koch { 537beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 538beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 539beafc54cSHans J. Koch DECLARE_WAITQUEUE(wait, current); 540beafc54cSHans J. Koch ssize_t retval; 541beafc54cSHans J. Koch s32 event_count; 542beafc54cSHans J. Koch 543beafc54cSHans J. Koch if (idev->info->irq == UIO_IRQ_NONE) 544beafc54cSHans J. Koch return -EIO; 545beafc54cSHans J. Koch 546beafc54cSHans J. Koch if (count != sizeof(s32)) 547beafc54cSHans J. Koch return -EINVAL; 548beafc54cSHans J. Koch 549beafc54cSHans J. Koch add_wait_queue(&idev->wait, &wait); 550beafc54cSHans J. Koch 551beafc54cSHans J. Koch do { 552beafc54cSHans J. Koch set_current_state(TASK_INTERRUPTIBLE); 553beafc54cSHans J. Koch 554beafc54cSHans J. Koch event_count = atomic_read(&idev->event); 555beafc54cSHans J. Koch if (event_count != listener->event_count) { 556beafc54cSHans J. Koch if (copy_to_user(buf, &event_count, count)) 557beafc54cSHans J. Koch retval = -EFAULT; 558beafc54cSHans J. Koch else { 559beafc54cSHans J. Koch listener->event_count = event_count; 560beafc54cSHans J. Koch retval = count; 561beafc54cSHans J. Koch } 562beafc54cSHans J. Koch break; 563beafc54cSHans J. Koch } 564beafc54cSHans J. Koch 565beafc54cSHans J. Koch if (filep->f_flags & O_NONBLOCK) { 566beafc54cSHans J. Koch retval = -EAGAIN; 567beafc54cSHans J. Koch break; 568beafc54cSHans J. Koch } 569beafc54cSHans J. Koch 570beafc54cSHans J. Koch if (signal_pending(current)) { 571beafc54cSHans J. Koch retval = -ERESTARTSYS; 572beafc54cSHans J. Koch break; 573beafc54cSHans J. Koch } 574beafc54cSHans J. Koch schedule(); 575beafc54cSHans J. Koch } while (1); 576beafc54cSHans J. Koch 577beafc54cSHans J. Koch __set_current_state(TASK_RUNNING); 578beafc54cSHans J. Koch remove_wait_queue(&idev->wait, &wait); 579beafc54cSHans J. Koch 580beafc54cSHans J. Koch return retval; 581beafc54cSHans J. Koch } 582beafc54cSHans J. Koch 583328a14e7SHans J. Koch static ssize_t uio_write(struct file *filep, const char __user *buf, 584328a14e7SHans J. Koch size_t count, loff_t *ppos) 585328a14e7SHans J. Koch { 586328a14e7SHans J. Koch struct uio_listener *listener = filep->private_data; 587328a14e7SHans J. Koch struct uio_device *idev = listener->dev; 588328a14e7SHans J. Koch ssize_t retval; 589328a14e7SHans J. Koch s32 irq_on; 590328a14e7SHans J. Koch 591328a14e7SHans J. Koch if (idev->info->irq == UIO_IRQ_NONE) 592328a14e7SHans J. Koch return -EIO; 593328a14e7SHans J. Koch 594328a14e7SHans J. Koch if (count != sizeof(s32)) 595328a14e7SHans J. Koch return -EINVAL; 596328a14e7SHans J. Koch 597328a14e7SHans J. Koch if (!idev->info->irqcontrol) 598328a14e7SHans J. Koch return -ENOSYS; 599328a14e7SHans J. Koch 600328a14e7SHans J. Koch if (copy_from_user(&irq_on, buf, count)) 601328a14e7SHans J. Koch return -EFAULT; 602328a14e7SHans J. Koch 603328a14e7SHans J. Koch retval = idev->info->irqcontrol(idev->info, irq_on); 604328a14e7SHans J. Koch 605328a14e7SHans J. Koch return retval ? retval : sizeof(s32); 606328a14e7SHans J. Koch } 607328a14e7SHans J. Koch 608beafc54cSHans J. Koch static int uio_find_mem_index(struct vm_area_struct *vma) 609beafc54cSHans J. Koch { 610beafc54cSHans J. Koch int mi; 611beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 612beafc54cSHans J. Koch 613beafc54cSHans J. Koch for (mi = 0; mi < MAX_UIO_MAPS; mi++) { 614beafc54cSHans J. Koch if (idev->info->mem[mi].size == 0) 615beafc54cSHans J. Koch return -1; 616beafc54cSHans J. Koch if (vma->vm_pgoff == mi) 617beafc54cSHans J. Koch return mi; 618beafc54cSHans J. Koch } 619beafc54cSHans J. Koch return -1; 620beafc54cSHans J. Koch } 621beafc54cSHans J. Koch 622beafc54cSHans J. Koch static void uio_vma_open(struct vm_area_struct *vma) 623beafc54cSHans J. Koch { 624beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 625beafc54cSHans J. Koch idev->vma_count++; 626beafc54cSHans J. Koch } 627beafc54cSHans J. Koch 628beafc54cSHans J. Koch static void uio_vma_close(struct vm_area_struct *vma) 629beafc54cSHans J. Koch { 630beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 631beafc54cSHans J. Koch idev->vma_count--; 632beafc54cSHans J. Koch } 633beafc54cSHans J. Koch 634a18b630dSNick Piggin static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 635beafc54cSHans J. Koch { 636beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 637a18b630dSNick Piggin struct page *page; 63802683ffdSAndrew G. Harvey unsigned long offset; 639beafc54cSHans J. Koch 640beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 641beafc54cSHans J. Koch if (mi < 0) 642a18b630dSNick Piggin return VM_FAULT_SIGBUS; 643beafc54cSHans J. Koch 64402683ffdSAndrew G. Harvey /* 64502683ffdSAndrew G. Harvey * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 64602683ffdSAndrew G. Harvey * to use mem[N]. 64702683ffdSAndrew G. Harvey */ 64802683ffdSAndrew G. Harvey offset = (vmf->pgoff - mi) << PAGE_SHIFT; 64902683ffdSAndrew G. Harvey 650beafc54cSHans J. Koch if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) 65102683ffdSAndrew G. Harvey page = virt_to_page(idev->info->mem[mi].addr + offset); 652beafc54cSHans J. Koch else 65302683ffdSAndrew G. Harvey page = vmalloc_to_page((void *)idev->info->mem[mi].addr 65402683ffdSAndrew G. Harvey + offset); 655beafc54cSHans J. Koch get_page(page); 656a18b630dSNick Piggin vmf->page = page; 657a18b630dSNick Piggin return 0; 658beafc54cSHans J. Koch } 659beafc54cSHans J. Koch 660f0f37e2fSAlexey Dobriyan static const struct vm_operations_struct uio_vm_ops = { 661beafc54cSHans J. Koch .open = uio_vma_open, 662beafc54cSHans J. Koch .close = uio_vma_close, 663a18b630dSNick Piggin .fault = uio_vma_fault, 664beafc54cSHans J. Koch }; 665beafc54cSHans J. Koch 666beafc54cSHans J. Koch static int uio_mmap_physical(struct vm_area_struct *vma) 667beafc54cSHans J. Koch { 668beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 669beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 670beafc54cSHans J. Koch if (mi < 0) 671beafc54cSHans J. Koch return -EINVAL; 672beafc54cSHans J. Koch 673beafc54cSHans J. Koch vma->vm_flags |= VM_IO | VM_RESERVED; 674beafc54cSHans J. Koch 675c9698d6bSJean-Samuel Chenard vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 676c9698d6bSJean-Samuel Chenard 677beafc54cSHans J. Koch return remap_pfn_range(vma, 678beafc54cSHans J. Koch vma->vm_start, 679beafc54cSHans J. Koch idev->info->mem[mi].addr >> PAGE_SHIFT, 680beafc54cSHans J. Koch vma->vm_end - vma->vm_start, 681beafc54cSHans J. Koch vma->vm_page_prot); 682beafc54cSHans J. Koch } 683beafc54cSHans J. Koch 684beafc54cSHans J. Koch static int uio_mmap_logical(struct vm_area_struct *vma) 685beafc54cSHans J. Koch { 686beafc54cSHans J. Koch vma->vm_flags |= VM_RESERVED; 687beafc54cSHans J. Koch vma->vm_ops = &uio_vm_ops; 688beafc54cSHans J. Koch uio_vma_open(vma); 689beafc54cSHans J. Koch return 0; 690beafc54cSHans J. Koch } 691beafc54cSHans J. Koch 692beafc54cSHans J. Koch static int uio_mmap(struct file *filep, struct vm_area_struct *vma) 693beafc54cSHans J. Koch { 694beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 695beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 696beafc54cSHans J. Koch int mi; 697beafc54cSHans J. Koch unsigned long requested_pages, actual_pages; 698beafc54cSHans J. Koch int ret = 0; 699beafc54cSHans J. Koch 700beafc54cSHans J. Koch if (vma->vm_end < vma->vm_start) 701beafc54cSHans J. Koch return -EINVAL; 702beafc54cSHans J. Koch 703beafc54cSHans J. Koch vma->vm_private_data = idev; 704beafc54cSHans J. Koch 705beafc54cSHans J. Koch mi = uio_find_mem_index(vma); 706beafc54cSHans J. Koch if (mi < 0) 707beafc54cSHans J. Koch return -EINVAL; 708beafc54cSHans J. Koch 709beafc54cSHans J. Koch requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; 7106da2d377SIan Abbott actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) 7116da2d377SIan Abbott + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; 712beafc54cSHans J. Koch if (requested_pages > actual_pages) 713beafc54cSHans J. Koch return -EINVAL; 714beafc54cSHans J. Koch 715beafc54cSHans J. Koch if (idev->info->mmap) { 716beafc54cSHans J. Koch ret = idev->info->mmap(idev->info, vma); 717beafc54cSHans J. Koch return ret; 718beafc54cSHans J. Koch } 719beafc54cSHans J. Koch 720beafc54cSHans J. Koch switch (idev->info->mem[mi].memtype) { 721beafc54cSHans J. Koch case UIO_MEM_PHYS: 722beafc54cSHans J. Koch return uio_mmap_physical(vma); 723beafc54cSHans J. Koch case UIO_MEM_LOGICAL: 724beafc54cSHans J. Koch case UIO_MEM_VIRTUAL: 725beafc54cSHans J. Koch return uio_mmap_logical(vma); 726beafc54cSHans J. Koch default: 727beafc54cSHans J. Koch return -EINVAL; 728beafc54cSHans J. Koch } 729beafc54cSHans J. Koch } 730beafc54cSHans J. Koch 7314f014691SJan Engelhardt static const struct file_operations uio_fops = { 732beafc54cSHans J. Koch .owner = THIS_MODULE, 733beafc54cSHans J. Koch .open = uio_open, 734beafc54cSHans J. Koch .release = uio_release, 735beafc54cSHans J. Koch .read = uio_read, 736328a14e7SHans J. Koch .write = uio_write, 737beafc54cSHans J. Koch .mmap = uio_mmap, 738beafc54cSHans J. Koch .poll = uio_poll, 739beafc54cSHans J. Koch .fasync = uio_fasync, 740beafc54cSHans J. Koch }; 741beafc54cSHans J. Koch 742beafc54cSHans J. Koch static int uio_major_init(void) 743beafc54cSHans J. Koch { 744beafc54cSHans J. Koch uio_major = register_chrdev(0, "uio", &uio_fops); 745beafc54cSHans J. Koch if (uio_major < 0) 746beafc54cSHans J. Koch return uio_major; 747beafc54cSHans J. Koch return 0; 748beafc54cSHans J. Koch } 749beafc54cSHans J. Koch 750beafc54cSHans J. Koch static void uio_major_cleanup(void) 751beafc54cSHans J. Koch { 752beafc54cSHans J. Koch unregister_chrdev(uio_major, "uio"); 753beafc54cSHans J. Koch } 754beafc54cSHans J. Koch 755beafc54cSHans J. Koch static int init_uio_class(void) 756beafc54cSHans J. Koch { 7573d4f9d76SEric W. Biederman struct class *class; 7583d4f9d76SEric W. Biederman int ret; 759beafc54cSHans J. Koch 760beafc54cSHans J. Koch /* This is the first time in here, set everything up properly */ 761beafc54cSHans J. Koch ret = uio_major_init(); 762beafc54cSHans J. Koch if (ret) 763beafc54cSHans J. Koch goto exit; 764beafc54cSHans J. Koch 7653d4f9d76SEric W. Biederman class = class_create(THIS_MODULE, "uio"); 7663d4f9d76SEric W. Biederman if (IS_ERR(class)) { 7673d4f9d76SEric W. Biederman ret = IS_ERR(class); 768beafc54cSHans J. Koch printk(KERN_ERR "class_create failed for uio\n"); 769beafc54cSHans J. Koch goto err_class_create; 770beafc54cSHans J. Koch } 7713d4f9d76SEric W. Biederman uio_class = class; 772beafc54cSHans J. Koch return 0; 773beafc54cSHans J. Koch 774beafc54cSHans J. Koch err_class_create: 775beafc54cSHans J. Koch uio_major_cleanup(); 776beafc54cSHans J. Koch exit: 777beafc54cSHans J. Koch return ret; 778beafc54cSHans J. Koch } 779beafc54cSHans J. Koch 7803d4f9d76SEric W. Biederman static void release_uio_class(void) 781beafc54cSHans J. Koch { 782beafc54cSHans J. Koch /* Ok, we cheat as we know we only have one uio_class */ 7833d4f9d76SEric W. Biederman class_destroy(uio_class); 784beafc54cSHans J. Koch uio_class = NULL; 7853d4f9d76SEric W. Biederman uio_major_cleanup(); 786beafc54cSHans J. Koch } 787beafc54cSHans J. Koch 788beafc54cSHans J. Koch /** 789beafc54cSHans J. Koch * uio_register_device - register a new userspace IO device 790beafc54cSHans J. Koch * @owner: module that creates the new device 791beafc54cSHans J. Koch * @parent: parent device 792beafc54cSHans J. Koch * @info: UIO device capabilities 793beafc54cSHans J. Koch * 794beafc54cSHans J. Koch * returns zero on success or a negative error code. 795beafc54cSHans J. Koch */ 796beafc54cSHans J. Koch int __uio_register_device(struct module *owner, 797beafc54cSHans J. Koch struct device *parent, 798beafc54cSHans J. Koch struct uio_info *info) 799beafc54cSHans J. Koch { 800beafc54cSHans J. Koch struct uio_device *idev; 801beafc54cSHans J. Koch int ret = 0; 802beafc54cSHans J. Koch 803beafc54cSHans J. Koch if (!parent || !info || !info->name || !info->version) 804beafc54cSHans J. Koch return -EINVAL; 805beafc54cSHans J. Koch 806beafc54cSHans J. Koch info->uio_dev = NULL; 807beafc54cSHans J. Koch 808beafc54cSHans J. Koch idev = kzalloc(sizeof(*idev), GFP_KERNEL); 809beafc54cSHans J. Koch if (!idev) { 810beafc54cSHans J. Koch ret = -ENOMEM; 811beafc54cSHans J. Koch goto err_kzalloc; 812beafc54cSHans J. Koch } 813beafc54cSHans J. Koch 814beafc54cSHans J. Koch idev->owner = owner; 815beafc54cSHans J. Koch idev->info = info; 816beafc54cSHans J. Koch init_waitqueue_head(&idev->wait); 817beafc54cSHans J. Koch atomic_set(&idev->event, 0); 818beafc54cSHans J. Koch 819beafc54cSHans J. Koch ret = uio_get_minor(idev); 820beafc54cSHans J. Koch if (ret) 821beafc54cSHans J. Koch goto err_get_minor; 822beafc54cSHans J. Koch 8233d4f9d76SEric W. Biederman idev->dev = device_create(uio_class, parent, 82443691da4SGreg Kroah-Hartman MKDEV(uio_major, idev->minor), idev, 825beafc54cSHans J. Koch "uio%d", idev->minor); 826beafc54cSHans J. Koch if (IS_ERR(idev->dev)) { 827beafc54cSHans J. Koch printk(KERN_ERR "UIO: device register failed\n"); 828beafc54cSHans J. Koch ret = PTR_ERR(idev->dev); 829beafc54cSHans J. Koch goto err_device_create; 830beafc54cSHans J. Koch } 831beafc54cSHans J. Koch 832beafc54cSHans J. Koch ret = uio_dev_add_attributes(idev); 833beafc54cSHans J. Koch if (ret) 834beafc54cSHans J. Koch goto err_uio_dev_add_attributes; 835beafc54cSHans J. Koch 836beafc54cSHans J. Koch info->uio_dev = idev; 837beafc54cSHans J. Koch 838beafc54cSHans J. Koch if (idev->info->irq >= 0) { 839beafc54cSHans J. Koch ret = request_irq(idev->info->irq, uio_interrupt, 840beafc54cSHans J. Koch idev->info->irq_flags, idev->info->name, idev); 841beafc54cSHans J. Koch if (ret) 842beafc54cSHans J. Koch goto err_request_irq; 843beafc54cSHans J. Koch } 844beafc54cSHans J. Koch 845beafc54cSHans J. Koch return 0; 846beafc54cSHans J. Koch 847beafc54cSHans J. Koch err_request_irq: 848beafc54cSHans J. Koch uio_dev_del_attributes(idev); 849beafc54cSHans J. Koch err_uio_dev_add_attributes: 8503d4f9d76SEric W. Biederman device_destroy(uio_class, MKDEV(uio_major, idev->minor)); 851beafc54cSHans J. Koch err_device_create: 852beafc54cSHans J. Koch uio_free_minor(idev); 853beafc54cSHans J. Koch err_get_minor: 854beafc54cSHans J. Koch kfree(idev); 855beafc54cSHans J. Koch err_kzalloc: 856beafc54cSHans J. Koch return ret; 857beafc54cSHans J. Koch } 858beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(__uio_register_device); 859beafc54cSHans J. Koch 860beafc54cSHans J. Koch /** 861beafc54cSHans J. Koch * uio_unregister_device - unregister a industrial IO device 862beafc54cSHans J. Koch * @info: UIO device capabilities 863beafc54cSHans J. Koch * 864beafc54cSHans J. Koch */ 865beafc54cSHans J. Koch void uio_unregister_device(struct uio_info *info) 866beafc54cSHans J. Koch { 867beafc54cSHans J. Koch struct uio_device *idev; 868beafc54cSHans J. Koch 869beafc54cSHans J. Koch if (!info || !info->uio_dev) 870beafc54cSHans J. Koch return; 871beafc54cSHans J. Koch 872beafc54cSHans J. Koch idev = info->uio_dev; 873beafc54cSHans J. Koch 874beafc54cSHans J. Koch uio_free_minor(idev); 875beafc54cSHans J. Koch 876beafc54cSHans J. Koch if (info->irq >= 0) 877beafc54cSHans J. Koch free_irq(info->irq, idev); 878beafc54cSHans J. Koch 879beafc54cSHans J. Koch uio_dev_del_attributes(idev); 880beafc54cSHans J. Koch 881beafc54cSHans J. Koch dev_set_drvdata(idev->dev, NULL); 8823d4f9d76SEric W. Biederman device_destroy(uio_class, MKDEV(uio_major, idev->minor)); 883beafc54cSHans J. Koch kfree(idev); 884beafc54cSHans J. Koch 885beafc54cSHans J. Koch return; 886beafc54cSHans J. Koch } 887beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_unregister_device); 888beafc54cSHans J. Koch 889beafc54cSHans J. Koch static int __init uio_init(void) 890beafc54cSHans J. Koch { 8913d4f9d76SEric W. Biederman return init_uio_class(); 892beafc54cSHans J. Koch } 893beafc54cSHans J. Koch 894beafc54cSHans J. Koch static void __exit uio_exit(void) 895beafc54cSHans J. Koch { 8963d4f9d76SEric W. Biederman release_uio_class(); 897beafc54cSHans J. Koch } 898beafc54cSHans J. Koch 899beafc54cSHans J. Koch module_init(uio_init) 900beafc54cSHans J. Koch module_exit(uio_exit) 901beafc54cSHans J. Koch MODULE_LICENSE("GPL v2"); 902