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> 20beafc54cSHans J. Koch #include <linux/mm.h> 21beafc54cSHans J. Koch #include <linux/idr.h> 22beafc54cSHans J. Koch #include <linux/string.h> 23beafc54cSHans J. Koch #include <linux/kobject.h> 24beafc54cSHans J. Koch #include <linux/uio_driver.h> 25beafc54cSHans J. Koch 26beafc54cSHans J. Koch #define UIO_MAX_DEVICES 255 27beafc54cSHans J. Koch 28beafc54cSHans J. Koch struct uio_device { 29beafc54cSHans J. Koch struct module *owner; 30beafc54cSHans J. Koch struct device *dev; 31beafc54cSHans J. Koch int minor; 32beafc54cSHans J. Koch atomic_t event; 33beafc54cSHans J. Koch struct fasync_struct *async_queue; 34beafc54cSHans J. Koch wait_queue_head_t wait; 35beafc54cSHans J. Koch int vma_count; 36beafc54cSHans J. Koch struct uio_info *info; 3781e7c6a6SGreg Kroah-Hartman struct kobject *map_dir; 38e70c412eSHans J. Koch struct kobject *portio_dir; 39beafc54cSHans J. Koch }; 40beafc54cSHans J. Koch 41beafc54cSHans J. Koch static int uio_major; 42beafc54cSHans J. Koch static DEFINE_IDR(uio_idr); 434f014691SJan Engelhardt static const struct file_operations uio_fops; 44beafc54cSHans J. Koch 45beafc54cSHans J. Koch /* UIO class infrastructure */ 46beafc54cSHans J. Koch static struct uio_class { 47beafc54cSHans J. Koch struct kref kref; 48beafc54cSHans J. Koch struct class *class; 49beafc54cSHans J. Koch } *uio_class; 50beafc54cSHans J. Koch 510d4a7bc1SJonathan Corbet /* Protect idr accesses */ 520d4a7bc1SJonathan Corbet static DEFINE_MUTEX(minor_lock); 530d4a7bc1SJonathan Corbet 54beafc54cSHans J. Koch /* 55beafc54cSHans J. Koch * attributes 56beafc54cSHans J. Koch */ 57beafc54cSHans J. Koch 5881e7c6a6SGreg Kroah-Hartman struct uio_map { 5981e7c6a6SGreg Kroah-Hartman struct kobject kobj; 6081e7c6a6SGreg Kroah-Hartman struct uio_mem *mem; 61beafc54cSHans J. Koch }; 6281e7c6a6SGreg Kroah-Hartman #define to_map(map) container_of(map, struct uio_map, kobj) 63beafc54cSHans J. Koch 6482057791SHans J. Koch static ssize_t map_name_show(struct uio_mem *mem, char *buf) 6582057791SHans J. Koch { 6682057791SHans J. Koch if (unlikely(!mem->name)) 6782057791SHans J. Koch mem->name = ""; 6882057791SHans J. Koch 6982057791SHans J. Koch return sprintf(buf, "%s\n", mem->name); 7082057791SHans J. Koch } 7182057791SHans J. Koch 724f808bcdSBrandon Philips static ssize_t map_addr_show(struct uio_mem *mem, char *buf) 73beafc54cSHans J. Koch { 74beafc54cSHans J. Koch return sprintf(buf, "0x%lx\n", mem->addr); 75beafc54cSHans J. Koch } 76beafc54cSHans J. Koch 774f808bcdSBrandon Philips static ssize_t map_size_show(struct uio_mem *mem, char *buf) 784f808bcdSBrandon Philips { 794f808bcdSBrandon Philips return sprintf(buf, "0x%lx\n", mem->size); 804f808bcdSBrandon Philips } 814f808bcdSBrandon Philips 82e2b39df1SHans J. Koch static ssize_t map_offset_show(struct uio_mem *mem, char *buf) 83e2b39df1SHans J. Koch { 84e2b39df1SHans J. Koch return sprintf(buf, "0x%lx\n", mem->addr & ~PAGE_MASK); 85e2b39df1SHans J. Koch } 86e2b39df1SHans J. Koch 87e70c412eSHans J. Koch struct map_sysfs_entry { 884f808bcdSBrandon Philips struct attribute attr; 894f808bcdSBrandon Philips ssize_t (*show)(struct uio_mem *, char *); 904f808bcdSBrandon Philips ssize_t (*store)(struct uio_mem *, const char *, size_t); 914f808bcdSBrandon Philips }; 924f808bcdSBrandon Philips 9382057791SHans J. Koch static struct map_sysfs_entry name_attribute = 9482057791SHans J. Koch __ATTR(name, S_IRUGO, map_name_show, NULL); 95e70c412eSHans J. Koch static struct map_sysfs_entry addr_attribute = 964f808bcdSBrandon Philips __ATTR(addr, S_IRUGO, map_addr_show, NULL); 97e70c412eSHans J. Koch static struct map_sysfs_entry size_attribute = 984f808bcdSBrandon Philips __ATTR(size, S_IRUGO, map_size_show, NULL); 99e70c412eSHans J. Koch static struct map_sysfs_entry offset_attribute = 100e2b39df1SHans J. Koch __ATTR(offset, S_IRUGO, map_offset_show, NULL); 101beafc54cSHans J. Koch 10281e7c6a6SGreg Kroah-Hartman static struct attribute *attrs[] = { 10382057791SHans J. Koch &name_attribute.attr, 1044f808bcdSBrandon Philips &addr_attribute.attr, 10581e7c6a6SGreg Kroah-Hartman &size_attribute.attr, 106e2b39df1SHans J. Koch &offset_attribute.attr, 10781e7c6a6SGreg Kroah-Hartman NULL, /* need to NULL terminate the list of attributes */ 108beafc54cSHans J. Koch }; 109beafc54cSHans J. Koch 11081e7c6a6SGreg Kroah-Hartman static void map_release(struct kobject *kobj) 11181e7c6a6SGreg Kroah-Hartman { 11281e7c6a6SGreg Kroah-Hartman struct uio_map *map = to_map(kobj); 11381e7c6a6SGreg Kroah-Hartman kfree(map); 11481e7c6a6SGreg Kroah-Hartman } 11581e7c6a6SGreg Kroah-Hartman 1164f808bcdSBrandon Philips static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, 1174f808bcdSBrandon Philips char *buf) 1184f808bcdSBrandon Philips { 1194f808bcdSBrandon Philips struct uio_map *map = to_map(kobj); 1204f808bcdSBrandon Philips struct uio_mem *mem = map->mem; 121e70c412eSHans J. Koch struct map_sysfs_entry *entry; 1224f808bcdSBrandon Philips 123e70c412eSHans J. Koch entry = container_of(attr, struct map_sysfs_entry, attr); 1244f808bcdSBrandon Philips 1254f808bcdSBrandon Philips if (!entry->show) 1264f808bcdSBrandon Philips return -EIO; 1274f808bcdSBrandon Philips 1284f808bcdSBrandon Philips return entry->show(mem, buf); 1294f808bcdSBrandon Philips } 1304f808bcdSBrandon Philips 131e70c412eSHans J. Koch static struct sysfs_ops map_sysfs_ops = { 1324f808bcdSBrandon Philips .show = map_type_show, 1334f808bcdSBrandon Philips }; 1344f808bcdSBrandon Philips 135beafc54cSHans J. Koch static struct kobj_type map_attr_type = { 13681e7c6a6SGreg Kroah-Hartman .release = map_release, 137e70c412eSHans J. Koch .sysfs_ops = &map_sysfs_ops, 13881e7c6a6SGreg Kroah-Hartman .default_attrs = attrs, 139beafc54cSHans J. Koch }; 140beafc54cSHans J. Koch 141e70c412eSHans J. Koch struct uio_portio { 142e70c412eSHans J. Koch struct kobject kobj; 143e70c412eSHans J. Koch struct uio_port *port; 144e70c412eSHans J. Koch }; 145e70c412eSHans J. Koch #define to_portio(portio) container_of(portio, struct uio_portio, kobj) 146e70c412eSHans J. Koch 14782057791SHans J. Koch static ssize_t portio_name_show(struct uio_port *port, char *buf) 14882057791SHans J. Koch { 14982057791SHans J. Koch if (unlikely(!port->name)) 15082057791SHans J. Koch port->name = ""; 15182057791SHans J. Koch 15282057791SHans J. Koch return sprintf(buf, "%s\n", port->name); 15382057791SHans J. Koch } 15482057791SHans J. Koch 155e70c412eSHans J. Koch static ssize_t portio_start_show(struct uio_port *port, char *buf) 156e70c412eSHans J. Koch { 157e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->start); 158e70c412eSHans J. Koch } 159e70c412eSHans J. Koch 160e70c412eSHans J. Koch static ssize_t portio_size_show(struct uio_port *port, char *buf) 161e70c412eSHans J. Koch { 162e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->size); 163e70c412eSHans J. Koch } 164e70c412eSHans J. Koch 165e70c412eSHans J. Koch static ssize_t portio_porttype_show(struct uio_port *port, char *buf) 166e70c412eSHans J. Koch { 167e70c412eSHans J. Koch const char *porttypes[] = {"none", "x86", "gpio", "other"}; 168e70c412eSHans J. Koch 169e70c412eSHans J. Koch if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) 170e70c412eSHans J. Koch return -EINVAL; 171e70c412eSHans J. Koch 172e70c412eSHans J. Koch return sprintf(buf, "port_%s\n", porttypes[port->porttype]); 173e70c412eSHans J. Koch } 174e70c412eSHans J. Koch 175e70c412eSHans J. Koch struct portio_sysfs_entry { 176e70c412eSHans J. Koch struct attribute attr; 177e70c412eSHans J. Koch ssize_t (*show)(struct uio_port *, char *); 178e70c412eSHans J. Koch ssize_t (*store)(struct uio_port *, const char *, size_t); 179e70c412eSHans J. Koch }; 180e70c412eSHans J. Koch 18182057791SHans J. Koch static struct portio_sysfs_entry portio_name_attribute = 18282057791SHans J. Koch __ATTR(name, S_IRUGO, portio_name_show, NULL); 183e70c412eSHans J. Koch static struct portio_sysfs_entry portio_start_attribute = 184e70c412eSHans J. Koch __ATTR(start, S_IRUGO, portio_start_show, NULL); 185e70c412eSHans J. Koch static struct portio_sysfs_entry portio_size_attribute = 186e70c412eSHans J. Koch __ATTR(size, S_IRUGO, portio_size_show, NULL); 187e70c412eSHans J. Koch static struct portio_sysfs_entry portio_porttype_attribute = 188e70c412eSHans J. Koch __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); 189e70c412eSHans J. Koch 190e70c412eSHans J. Koch static struct attribute *portio_attrs[] = { 19182057791SHans J. Koch &portio_name_attribute.attr, 192e70c412eSHans J. Koch &portio_start_attribute.attr, 193e70c412eSHans J. Koch &portio_size_attribute.attr, 194e70c412eSHans J. Koch &portio_porttype_attribute.attr, 195e70c412eSHans J. Koch NULL, 196e70c412eSHans J. Koch }; 197e70c412eSHans J. Koch 198e70c412eSHans J. Koch static void portio_release(struct kobject *kobj) 199e70c412eSHans J. Koch { 200e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 201e70c412eSHans J. Koch kfree(portio); 202e70c412eSHans J. Koch } 203e70c412eSHans J. Koch 204e70c412eSHans J. Koch static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, 205e70c412eSHans J. Koch char *buf) 206e70c412eSHans J. Koch { 207e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 208e70c412eSHans J. Koch struct uio_port *port = portio->port; 209e70c412eSHans J. Koch struct portio_sysfs_entry *entry; 210e70c412eSHans J. Koch 211e70c412eSHans J. Koch entry = container_of(attr, struct portio_sysfs_entry, attr); 212e70c412eSHans J. Koch 213e70c412eSHans J. Koch if (!entry->show) 214e70c412eSHans J. Koch return -EIO; 215e70c412eSHans J. Koch 216e70c412eSHans J. Koch return entry->show(port, buf); 217e70c412eSHans J. Koch } 218e70c412eSHans J. Koch 219e70c412eSHans J. Koch static struct sysfs_ops portio_sysfs_ops = { 220e70c412eSHans J. Koch .show = portio_type_show, 221e70c412eSHans J. Koch }; 222e70c412eSHans J. Koch 223e70c412eSHans J. Koch static struct kobj_type portio_attr_type = { 224e70c412eSHans J. Koch .release = portio_release, 225e70c412eSHans J. Koch .sysfs_ops = &portio_sysfs_ops, 226e70c412eSHans J. Koch .default_attrs = portio_attrs, 227e70c412eSHans J. Koch }; 228e70c412eSHans J. Koch 229beafc54cSHans J. Koch static ssize_t show_name(struct device *dev, 230beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 231beafc54cSHans J. Koch { 232beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 233beafc54cSHans J. Koch if (idev) 234beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->name); 235beafc54cSHans J. Koch else 236beafc54cSHans J. Koch return -ENODEV; 237beafc54cSHans J. Koch } 238beafc54cSHans J. Koch static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 239beafc54cSHans J. Koch 240beafc54cSHans J. Koch static ssize_t show_version(struct device *dev, 241beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 242beafc54cSHans J. Koch { 243beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 244beafc54cSHans J. Koch if (idev) 245beafc54cSHans J. Koch return sprintf(buf, "%s\n", idev->info->version); 246beafc54cSHans J. Koch else 247beafc54cSHans J. Koch return -ENODEV; 248beafc54cSHans J. Koch } 249beafc54cSHans J. Koch static DEVICE_ATTR(version, S_IRUGO, show_version, NULL); 250beafc54cSHans J. Koch 251beafc54cSHans J. Koch static ssize_t show_event(struct device *dev, 252beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 253beafc54cSHans J. Koch { 254beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 255beafc54cSHans J. Koch if (idev) 256beafc54cSHans J. Koch return sprintf(buf, "%u\n", 257beafc54cSHans J. Koch (unsigned int)atomic_read(&idev->event)); 258beafc54cSHans J. Koch else 259beafc54cSHans J. Koch return -ENODEV; 260beafc54cSHans J. Koch } 261beafc54cSHans J. Koch static DEVICE_ATTR(event, S_IRUGO, show_event, NULL); 262beafc54cSHans J. Koch 263beafc54cSHans J. Koch static struct attribute *uio_attrs[] = { 264beafc54cSHans J. Koch &dev_attr_name.attr, 265beafc54cSHans J. Koch &dev_attr_version.attr, 266beafc54cSHans J. Koch &dev_attr_event.attr, 267beafc54cSHans J. Koch NULL, 268beafc54cSHans J. Koch }; 269beafc54cSHans J. Koch 270beafc54cSHans J. Koch static struct attribute_group uio_attr_grp = { 271beafc54cSHans J. Koch .attrs = uio_attrs, 272beafc54cSHans J. Koch }; 273beafc54cSHans J. Koch 274beafc54cSHans J. Koch /* 275beafc54cSHans J. Koch * device functions 276beafc54cSHans J. Koch */ 277beafc54cSHans J. Koch static int uio_dev_add_attributes(struct uio_device *idev) 278beafc54cSHans J. Koch { 279beafc54cSHans J. Koch int ret; 280e70c412eSHans J. Koch int mi, pi; 281beafc54cSHans J. Koch int map_found = 0; 282e70c412eSHans J. Koch int portio_found = 0; 283beafc54cSHans J. Koch struct uio_mem *mem; 28481e7c6a6SGreg Kroah-Hartman struct uio_map *map; 285e70c412eSHans J. Koch struct uio_port *port; 286e70c412eSHans J. Koch struct uio_portio *portio; 287beafc54cSHans J. Koch 288beafc54cSHans J. Koch ret = sysfs_create_group(&idev->dev->kobj, &uio_attr_grp); 289beafc54cSHans J. Koch if (ret) 290beafc54cSHans J. Koch goto err_group; 291beafc54cSHans J. Koch 292beafc54cSHans J. Koch for (mi = 0; mi < MAX_UIO_MAPS; mi++) { 293beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 294beafc54cSHans J. Koch if (mem->size == 0) 295beafc54cSHans J. Koch break; 296beafc54cSHans J. Koch if (!map_found) { 297beafc54cSHans J. Koch map_found = 1; 29881e7c6a6SGreg Kroah-Hartman idev->map_dir = kobject_create_and_add("maps", 29981e7c6a6SGreg Kroah-Hartman &idev->dev->kobj); 30081e7c6a6SGreg Kroah-Hartman if (!idev->map_dir) 301e70c412eSHans J. Koch goto err_map; 302beafc54cSHans J. Koch } 30381e7c6a6SGreg Kroah-Hartman map = kzalloc(sizeof(*map), GFP_KERNEL); 30481e7c6a6SGreg Kroah-Hartman if (!map) 305e70c412eSHans J. Koch goto err_map; 306f9cb074bSGreg Kroah-Hartman kobject_init(&map->kobj, &map_attr_type); 30781e7c6a6SGreg Kroah-Hartman map->mem = mem; 30881e7c6a6SGreg Kroah-Hartman mem->map = map; 309b2d6db58SGreg Kroah-Hartman ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); 310beafc54cSHans J. Koch if (ret) 311e70c412eSHans J. Koch goto err_map; 31281e7c6a6SGreg Kroah-Hartman ret = kobject_uevent(&map->kobj, KOBJ_ADD); 31381e7c6a6SGreg Kroah-Hartman if (ret) 314e70c412eSHans J. Koch goto err_map; 315e70c412eSHans J. Koch } 316e70c412eSHans J. Koch 317e70c412eSHans J. Koch for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { 318e70c412eSHans J. Koch port = &idev->info->port[pi]; 319e70c412eSHans J. Koch if (port->size == 0) 320e70c412eSHans J. Koch break; 321e70c412eSHans J. Koch if (!portio_found) { 322e70c412eSHans J. Koch portio_found = 1; 323e70c412eSHans J. Koch idev->portio_dir = kobject_create_and_add("portio", 324e70c412eSHans J. Koch &idev->dev->kobj); 325e70c412eSHans J. Koch if (!idev->portio_dir) 326e70c412eSHans J. Koch goto err_portio; 327e70c412eSHans J. Koch } 328e70c412eSHans J. Koch portio = kzalloc(sizeof(*portio), GFP_KERNEL); 329e70c412eSHans J. Koch if (!portio) 330e70c412eSHans J. Koch goto err_portio; 331e70c412eSHans J. Koch kobject_init(&portio->kobj, &portio_attr_type); 332e70c412eSHans J. Koch portio->port = port; 333e70c412eSHans J. Koch port->portio = portio; 334e70c412eSHans J. Koch ret = kobject_add(&portio->kobj, idev->portio_dir, 335e70c412eSHans J. Koch "port%d", pi); 336e70c412eSHans J. Koch if (ret) 337e70c412eSHans J. Koch goto err_portio; 338e70c412eSHans J. Koch ret = kobject_uevent(&portio->kobj, KOBJ_ADD); 339e70c412eSHans J. Koch if (ret) 340e70c412eSHans J. Koch goto err_portio; 341beafc54cSHans J. Koch } 342beafc54cSHans J. Koch 343beafc54cSHans J. Koch return 0; 344beafc54cSHans J. Koch 345e70c412eSHans J. Koch err_portio: 346e70c412eSHans J. Koch for (pi--; pi >= 0; pi--) { 347e70c412eSHans J. Koch port = &idev->info->port[pi]; 348e70c412eSHans J. Koch portio = port->portio; 349e70c412eSHans J. Koch kobject_put(&portio->kobj); 350e70c412eSHans J. Koch } 351e70c412eSHans J. Koch kobject_put(idev->portio_dir); 352e70c412eSHans J. Koch err_map: 353beafc54cSHans J. Koch for (mi--; mi>=0; mi--) { 354beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 35581e7c6a6SGreg Kroah-Hartman map = mem->map; 356c10997f6SGreg Kroah-Hartman kobject_put(&map->kobj); 357beafc54cSHans J. Koch } 358c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 359beafc54cSHans J. Koch sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); 360beafc54cSHans J. Koch err_group: 361beafc54cSHans J. Koch dev_err(idev->dev, "error creating sysfs files (%d)\n", ret); 362beafc54cSHans J. Koch return ret; 363beafc54cSHans J. Koch } 364beafc54cSHans J. Koch 365beafc54cSHans J. Koch static void uio_dev_del_attributes(struct uio_device *idev) 366beafc54cSHans J. Koch { 367e70c412eSHans J. Koch int i; 368beafc54cSHans J. Koch struct uio_mem *mem; 369e70c412eSHans J. Koch struct uio_port *port; 370e70c412eSHans J. Koch 371e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_MAPS; i++) { 372e70c412eSHans J. Koch mem = &idev->info->mem[i]; 373beafc54cSHans J. Koch if (mem->size == 0) 374beafc54cSHans J. Koch break; 375c10997f6SGreg Kroah-Hartman kobject_put(&mem->map->kobj); 376beafc54cSHans J. Koch } 377c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 378e70c412eSHans J. Koch 379e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { 380e70c412eSHans J. Koch port = &idev->info->port[i]; 381e70c412eSHans J. Koch if (port->size == 0) 382e70c412eSHans J. Koch break; 383e70c412eSHans J. Koch kobject_put(&port->portio->kobj); 384e70c412eSHans J. Koch } 385e70c412eSHans J. Koch kobject_put(idev->portio_dir); 386e70c412eSHans J. Koch 387beafc54cSHans J. Koch sysfs_remove_group(&idev->dev->kobj, &uio_attr_grp); 388beafc54cSHans J. Koch } 389beafc54cSHans J. Koch 390beafc54cSHans J. Koch static int uio_get_minor(struct uio_device *idev) 391beafc54cSHans J. Koch { 392beafc54cSHans J. Koch int retval = -ENOMEM; 393beafc54cSHans J. Koch int id; 394beafc54cSHans J. Koch 395beafc54cSHans J. Koch mutex_lock(&minor_lock); 396beafc54cSHans J. Koch if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0) 397beafc54cSHans J. Koch goto exit; 398beafc54cSHans J. Koch 399beafc54cSHans J. Koch retval = idr_get_new(&uio_idr, idev, &id); 400beafc54cSHans J. Koch if (retval < 0) { 401beafc54cSHans J. Koch if (retval == -EAGAIN) 402beafc54cSHans J. Koch retval = -ENOMEM; 403beafc54cSHans J. Koch goto exit; 404beafc54cSHans J. Koch } 405beafc54cSHans J. Koch idev->minor = id & MAX_ID_MASK; 406beafc54cSHans J. Koch exit: 407beafc54cSHans J. Koch mutex_unlock(&minor_lock); 408beafc54cSHans J. Koch return retval; 409beafc54cSHans J. Koch } 410beafc54cSHans J. Koch 411beafc54cSHans J. Koch static void uio_free_minor(struct uio_device *idev) 412beafc54cSHans J. Koch { 4130d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 414beafc54cSHans J. Koch idr_remove(&uio_idr, idev->minor); 4150d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 416beafc54cSHans J. Koch } 417beafc54cSHans J. Koch 418beafc54cSHans J. Koch /** 419beafc54cSHans J. Koch * uio_event_notify - trigger an interrupt event 420beafc54cSHans J. Koch * @info: UIO device capabilities 421beafc54cSHans J. Koch */ 422beafc54cSHans J. Koch void uio_event_notify(struct uio_info *info) 423beafc54cSHans J. Koch { 424beafc54cSHans J. Koch struct uio_device *idev = info->uio_dev; 425beafc54cSHans J. Koch 426beafc54cSHans J. Koch atomic_inc(&idev->event); 427beafc54cSHans J. Koch wake_up_interruptible(&idev->wait); 428beafc54cSHans J. Koch kill_fasync(&idev->async_queue, SIGIO, POLL_IN); 429beafc54cSHans J. Koch } 430beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_event_notify); 431beafc54cSHans J. Koch 432beafc54cSHans J. Koch /** 433beafc54cSHans J. Koch * uio_interrupt - hardware interrupt handler 434beafc54cSHans J. Koch * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer 435beafc54cSHans J. Koch * @dev_id: Pointer to the devices uio_device structure 436beafc54cSHans J. Koch */ 437beafc54cSHans J. Koch static irqreturn_t uio_interrupt(int irq, void *dev_id) 438beafc54cSHans J. Koch { 439beafc54cSHans J. Koch struct uio_device *idev = (struct uio_device *)dev_id; 440beafc54cSHans J. Koch irqreturn_t ret = idev->info->handler(irq, idev->info); 441beafc54cSHans J. Koch 442beafc54cSHans J. Koch if (ret == IRQ_HANDLED) 443beafc54cSHans J. Koch uio_event_notify(idev->info); 444beafc54cSHans J. Koch 445beafc54cSHans J. Koch return ret; 446beafc54cSHans J. Koch } 447beafc54cSHans J. Koch 448beafc54cSHans J. Koch struct uio_listener { 449beafc54cSHans J. Koch struct uio_device *dev; 450beafc54cSHans J. Koch s32 event_count; 451beafc54cSHans J. Koch }; 452beafc54cSHans J. Koch 453beafc54cSHans J. Koch static int uio_open(struct inode *inode, struct file *filep) 454beafc54cSHans J. Koch { 455beafc54cSHans J. Koch struct uio_device *idev; 456beafc54cSHans J. Koch struct uio_listener *listener; 457beafc54cSHans J. Koch int ret = 0; 458beafc54cSHans J. Koch 4590d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 460beafc54cSHans J. Koch idev = idr_find(&uio_idr, iminor(inode)); 4610d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 462fbc8a81dSJonathan Corbet if (!idev) { 463fbc8a81dSJonathan Corbet ret = -ENODEV; 464fbc8a81dSJonathan Corbet goto out; 465fbc8a81dSJonathan Corbet } 466beafc54cSHans J. Koch 467fbc8a81dSJonathan Corbet if (!try_module_get(idev->owner)) { 468fbc8a81dSJonathan Corbet ret = -ENODEV; 469fbc8a81dSJonathan Corbet goto out; 470fbc8a81dSJonathan Corbet } 471610ad506SUwe Kleine-König 472beafc54cSHans J. Koch listener = kmalloc(sizeof(*listener), GFP_KERNEL); 473610ad506SUwe Kleine-König if (!listener) { 474610ad506SUwe Kleine-König ret = -ENOMEM; 475610ad506SUwe Kleine-König goto err_alloc_listener; 476610ad506SUwe Kleine-König } 477beafc54cSHans J. Koch 478beafc54cSHans J. Koch listener->dev = idev; 479beafc54cSHans J. Koch listener->event_count = atomic_read(&idev->event); 480beafc54cSHans J. Koch filep->private_data = listener; 481beafc54cSHans J. Koch 482beafc54cSHans J. Koch if (idev->info->open) { 483beafc54cSHans J. Koch ret = idev->info->open(idev->info, inode); 484610ad506SUwe Kleine-König if (ret) 485610ad506SUwe Kleine-König goto err_infoopen; 486beafc54cSHans J. Koch } 487610ad506SUwe Kleine-König return 0; 488610ad506SUwe Kleine-König 489610ad506SUwe Kleine-König err_infoopen: 490beafc54cSHans J. Koch kfree(listener); 491610ad506SUwe Kleine-König 4920d4a7bc1SJonathan Corbet err_alloc_listener: 493610ad506SUwe Kleine-König module_put(idev->owner); 494beafc54cSHans J. Koch 495fbc8a81dSJonathan Corbet out: 496beafc54cSHans J. Koch return ret; 497beafc54cSHans J. Koch } 498beafc54cSHans J. Koch 499beafc54cSHans J. Koch static int uio_fasync(int fd, struct file *filep, int on) 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 504beafc54cSHans J. Koch return fasync_helper(fd, filep, on, &idev->async_queue); 505beafc54cSHans J. Koch } 506beafc54cSHans J. Koch 507beafc54cSHans J. Koch static int uio_release(struct inode *inode, struct file *filep) 508beafc54cSHans J. Koch { 509beafc54cSHans J. Koch int ret = 0; 510beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 511beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 512beafc54cSHans J. Koch 513610ad506SUwe Kleine-König if (idev->info->release) 514beafc54cSHans J. Koch ret = idev->info->release(idev->info, inode); 515610ad506SUwe Kleine-König 516beafc54cSHans J. Koch module_put(idev->owner); 517beafc54cSHans J. Koch kfree(listener); 518beafc54cSHans J. Koch return ret; 519beafc54cSHans J. Koch } 520beafc54cSHans J. Koch 521beafc54cSHans J. Koch static unsigned int uio_poll(struct file *filep, poll_table *wait) 522beafc54cSHans J. Koch { 523beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 524beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 525beafc54cSHans J. Koch 526beafc54cSHans J. Koch if (idev->info->irq == UIO_IRQ_NONE) 527beafc54cSHans J. Koch return -EIO; 528beafc54cSHans J. Koch 529beafc54cSHans J. Koch poll_wait(filep, &idev->wait, wait); 530beafc54cSHans J. Koch if (listener->event_count != atomic_read(&idev->event)) 531beafc54cSHans J. Koch return POLLIN | POLLRDNORM; 532beafc54cSHans J. Koch return 0; 533beafc54cSHans J. Koch } 534beafc54cSHans J. Koch 535beafc54cSHans J. Koch static ssize_t uio_read(struct file *filep, char __user *buf, 536beafc54cSHans J. Koch size_t count, loff_t *ppos) 537beafc54cSHans J. Koch { 538beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 539beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 540beafc54cSHans J. Koch DECLARE_WAITQUEUE(wait, current); 541beafc54cSHans J. Koch ssize_t retval; 542beafc54cSHans J. Koch s32 event_count; 543beafc54cSHans J. Koch 544beafc54cSHans J. Koch if (idev->info->irq == UIO_IRQ_NONE) 545beafc54cSHans J. Koch return -EIO; 546beafc54cSHans J. Koch 547beafc54cSHans J. Koch if (count != sizeof(s32)) 548beafc54cSHans J. Koch return -EINVAL; 549beafc54cSHans J. Koch 550beafc54cSHans J. Koch add_wait_queue(&idev->wait, &wait); 551beafc54cSHans J. Koch 552beafc54cSHans J. Koch do { 553beafc54cSHans J. Koch set_current_state(TASK_INTERRUPTIBLE); 554beafc54cSHans J. Koch 555beafc54cSHans J. Koch event_count = atomic_read(&idev->event); 556beafc54cSHans J. Koch if (event_count != listener->event_count) { 557beafc54cSHans J. Koch if (copy_to_user(buf, &event_count, count)) 558beafc54cSHans J. Koch retval = -EFAULT; 559beafc54cSHans J. Koch else { 560beafc54cSHans J. Koch listener->event_count = event_count; 561beafc54cSHans J. Koch retval = count; 562beafc54cSHans J. Koch } 563beafc54cSHans J. Koch break; 564beafc54cSHans J. Koch } 565beafc54cSHans J. Koch 566beafc54cSHans J. Koch if (filep->f_flags & O_NONBLOCK) { 567beafc54cSHans J. Koch retval = -EAGAIN; 568beafc54cSHans J. Koch break; 569beafc54cSHans J. Koch } 570beafc54cSHans J. Koch 571beafc54cSHans J. Koch if (signal_pending(current)) { 572beafc54cSHans J. Koch retval = -ERESTARTSYS; 573beafc54cSHans J. Koch break; 574beafc54cSHans J. Koch } 575beafc54cSHans J. Koch schedule(); 576beafc54cSHans J. Koch } while (1); 577beafc54cSHans J. Koch 578beafc54cSHans J. Koch __set_current_state(TASK_RUNNING); 579beafc54cSHans J. Koch remove_wait_queue(&idev->wait, &wait); 580beafc54cSHans J. Koch 581beafc54cSHans J. Koch return retval; 582beafc54cSHans J. Koch } 583beafc54cSHans J. Koch 584328a14e7SHans J. Koch static ssize_t uio_write(struct file *filep, const char __user *buf, 585328a14e7SHans J. Koch size_t count, loff_t *ppos) 586328a14e7SHans J. Koch { 587328a14e7SHans J. Koch struct uio_listener *listener = filep->private_data; 588328a14e7SHans J. Koch struct uio_device *idev = listener->dev; 589328a14e7SHans J. Koch ssize_t retval; 590328a14e7SHans J. Koch s32 irq_on; 591328a14e7SHans J. Koch 592328a14e7SHans J. Koch if (idev->info->irq == UIO_IRQ_NONE) 593328a14e7SHans J. Koch return -EIO; 594328a14e7SHans J. Koch 595328a14e7SHans J. Koch if (count != sizeof(s32)) 596328a14e7SHans J. Koch return -EINVAL; 597328a14e7SHans J. Koch 598328a14e7SHans J. Koch if (!idev->info->irqcontrol) 599328a14e7SHans J. Koch return -ENOSYS; 600328a14e7SHans J. Koch 601328a14e7SHans J. Koch if (copy_from_user(&irq_on, buf, count)) 602328a14e7SHans J. Koch return -EFAULT; 603328a14e7SHans J. Koch 604328a14e7SHans J. Koch retval = idev->info->irqcontrol(idev->info, irq_on); 605328a14e7SHans J. Koch 606328a14e7SHans J. Koch return retval ? retval : sizeof(s32); 607328a14e7SHans J. Koch } 608328a14e7SHans J. Koch 609beafc54cSHans J. Koch static int uio_find_mem_index(struct vm_area_struct *vma) 610beafc54cSHans J. Koch { 611beafc54cSHans J. Koch int mi; 612beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 613beafc54cSHans J. Koch 614beafc54cSHans J. Koch for (mi = 0; mi < MAX_UIO_MAPS; mi++) { 615beafc54cSHans J. Koch if (idev->info->mem[mi].size == 0) 616beafc54cSHans J. Koch return -1; 617beafc54cSHans J. Koch if (vma->vm_pgoff == mi) 618beafc54cSHans J. Koch return mi; 619beafc54cSHans J. Koch } 620beafc54cSHans J. Koch return -1; 621beafc54cSHans J. Koch } 622beafc54cSHans J. Koch 623beafc54cSHans J. Koch static void uio_vma_open(struct vm_area_struct *vma) 624beafc54cSHans J. Koch { 625beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 626beafc54cSHans J. Koch idev->vma_count++; 627beafc54cSHans J. Koch } 628beafc54cSHans J. Koch 629beafc54cSHans J. Koch static void uio_vma_close(struct vm_area_struct *vma) 630beafc54cSHans J. Koch { 631beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 632beafc54cSHans J. Koch idev->vma_count--; 633beafc54cSHans J. Koch } 634beafc54cSHans J. Koch 635a18b630dSNick Piggin static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 636beafc54cSHans J. Koch { 637beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 638a18b630dSNick Piggin struct page *page; 63902683ffdSAndrew G. Harvey unsigned long offset; 640beafc54cSHans J. Koch 641beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 642beafc54cSHans J. Koch if (mi < 0) 643a18b630dSNick Piggin return VM_FAULT_SIGBUS; 644beafc54cSHans J. Koch 64502683ffdSAndrew G. Harvey /* 64602683ffdSAndrew G. Harvey * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 64702683ffdSAndrew G. Harvey * to use mem[N]. 64802683ffdSAndrew G. Harvey */ 64902683ffdSAndrew G. Harvey offset = (vmf->pgoff - mi) << PAGE_SHIFT; 65002683ffdSAndrew G. Harvey 651beafc54cSHans J. Koch if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) 65202683ffdSAndrew G. Harvey page = virt_to_page(idev->info->mem[mi].addr + offset); 653beafc54cSHans J. Koch else 65402683ffdSAndrew G. Harvey page = vmalloc_to_page((void *)idev->info->mem[mi].addr 65502683ffdSAndrew G. Harvey + offset); 656beafc54cSHans J. Koch get_page(page); 657a18b630dSNick Piggin vmf->page = page; 658a18b630dSNick Piggin return 0; 659beafc54cSHans J. Koch } 660beafc54cSHans J. Koch 661f0f37e2fSAlexey Dobriyan static const struct vm_operations_struct uio_vm_ops = { 662beafc54cSHans J. Koch .open = uio_vma_open, 663beafc54cSHans J. Koch .close = uio_vma_close, 664a18b630dSNick Piggin .fault = uio_vma_fault, 665beafc54cSHans J. Koch }; 666beafc54cSHans J. Koch 667beafc54cSHans J. Koch static int uio_mmap_physical(struct vm_area_struct *vma) 668beafc54cSHans J. Koch { 669beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 670beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 671beafc54cSHans J. Koch if (mi < 0) 672beafc54cSHans J. Koch return -EINVAL; 673beafc54cSHans J. Koch 674beafc54cSHans J. Koch vma->vm_flags |= VM_IO | VM_RESERVED; 675beafc54cSHans J. Koch 676c9698d6bSJean-Samuel Chenard vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 677c9698d6bSJean-Samuel Chenard 678beafc54cSHans J. Koch return remap_pfn_range(vma, 679beafc54cSHans J. Koch vma->vm_start, 680beafc54cSHans J. Koch idev->info->mem[mi].addr >> PAGE_SHIFT, 681beafc54cSHans J. Koch vma->vm_end - vma->vm_start, 682beafc54cSHans J. Koch vma->vm_page_prot); 683beafc54cSHans J. Koch } 684beafc54cSHans J. Koch 685beafc54cSHans J. Koch static int uio_mmap_logical(struct vm_area_struct *vma) 686beafc54cSHans J. Koch { 687beafc54cSHans J. Koch vma->vm_flags |= VM_RESERVED; 688beafc54cSHans J. Koch vma->vm_ops = &uio_vm_ops; 689beafc54cSHans J. Koch uio_vma_open(vma); 690beafc54cSHans J. Koch return 0; 691beafc54cSHans J. Koch } 692beafc54cSHans J. Koch 693beafc54cSHans J. Koch static int uio_mmap(struct file *filep, struct vm_area_struct *vma) 694beafc54cSHans J. Koch { 695beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 696beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 697beafc54cSHans J. Koch int mi; 698beafc54cSHans J. Koch unsigned long requested_pages, actual_pages; 699beafc54cSHans J. Koch int ret = 0; 700beafc54cSHans J. Koch 701beafc54cSHans J. Koch if (vma->vm_end < vma->vm_start) 702beafc54cSHans J. Koch return -EINVAL; 703beafc54cSHans J. Koch 704beafc54cSHans J. Koch vma->vm_private_data = idev; 705beafc54cSHans J. Koch 706beafc54cSHans J. Koch mi = uio_find_mem_index(vma); 707beafc54cSHans J. Koch if (mi < 0) 708beafc54cSHans J. Koch return -EINVAL; 709beafc54cSHans J. Koch 710beafc54cSHans J. Koch requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; 7116da2d377SIan Abbott actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) 7126da2d377SIan Abbott + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; 713beafc54cSHans J. Koch if (requested_pages > actual_pages) 714beafc54cSHans J. Koch return -EINVAL; 715beafc54cSHans J. Koch 716beafc54cSHans J. Koch if (idev->info->mmap) { 717beafc54cSHans J. Koch ret = idev->info->mmap(idev->info, vma); 718beafc54cSHans J. Koch return ret; 719beafc54cSHans J. Koch } 720beafc54cSHans J. Koch 721beafc54cSHans J. Koch switch (idev->info->mem[mi].memtype) { 722beafc54cSHans J. Koch case UIO_MEM_PHYS: 723beafc54cSHans J. Koch return uio_mmap_physical(vma); 724beafc54cSHans J. Koch case UIO_MEM_LOGICAL: 725beafc54cSHans J. Koch case UIO_MEM_VIRTUAL: 726beafc54cSHans J. Koch return uio_mmap_logical(vma); 727beafc54cSHans J. Koch default: 728beafc54cSHans J. Koch return -EINVAL; 729beafc54cSHans J. Koch } 730beafc54cSHans J. Koch } 731beafc54cSHans J. Koch 7324f014691SJan Engelhardt static const struct file_operations uio_fops = { 733beafc54cSHans J. Koch .owner = THIS_MODULE, 734beafc54cSHans J. Koch .open = uio_open, 735beafc54cSHans J. Koch .release = uio_release, 736beafc54cSHans J. Koch .read = uio_read, 737328a14e7SHans J. Koch .write = uio_write, 738beafc54cSHans J. Koch .mmap = uio_mmap, 739beafc54cSHans J. Koch .poll = uio_poll, 740beafc54cSHans J. Koch .fasync = uio_fasync, 741beafc54cSHans J. Koch }; 742beafc54cSHans J. Koch 743beafc54cSHans J. Koch static int uio_major_init(void) 744beafc54cSHans J. Koch { 745beafc54cSHans J. Koch uio_major = register_chrdev(0, "uio", &uio_fops); 746beafc54cSHans J. Koch if (uio_major < 0) 747beafc54cSHans J. Koch return uio_major; 748beafc54cSHans J. Koch return 0; 749beafc54cSHans J. Koch } 750beafc54cSHans J. Koch 751beafc54cSHans J. Koch static void uio_major_cleanup(void) 752beafc54cSHans J. Koch { 753beafc54cSHans J. Koch unregister_chrdev(uio_major, "uio"); 754beafc54cSHans J. Koch } 755beafc54cSHans J. Koch 756beafc54cSHans J. Koch static int init_uio_class(void) 757beafc54cSHans J. Koch { 758beafc54cSHans J. Koch int ret = 0; 759beafc54cSHans J. Koch 760beafc54cSHans J. Koch if (uio_class != NULL) { 761beafc54cSHans J. Koch kref_get(&uio_class->kref); 762beafc54cSHans J. Koch goto exit; 763beafc54cSHans J. Koch } 764beafc54cSHans J. Koch 765beafc54cSHans J. Koch /* This is the first time in here, set everything up properly */ 766beafc54cSHans J. Koch ret = uio_major_init(); 767beafc54cSHans J. Koch if (ret) 768beafc54cSHans J. Koch goto exit; 769beafc54cSHans J. Koch 770beafc54cSHans J. Koch uio_class = kzalloc(sizeof(*uio_class), GFP_KERNEL); 771beafc54cSHans J. Koch if (!uio_class) { 772beafc54cSHans J. Koch ret = -ENOMEM; 773beafc54cSHans J. Koch goto err_kzalloc; 774beafc54cSHans J. Koch } 775beafc54cSHans J. Koch 776beafc54cSHans J. Koch kref_init(&uio_class->kref); 777beafc54cSHans J. Koch uio_class->class = class_create(THIS_MODULE, "uio"); 778beafc54cSHans J. Koch if (IS_ERR(uio_class->class)) { 779beafc54cSHans J. Koch ret = IS_ERR(uio_class->class); 780beafc54cSHans J. Koch printk(KERN_ERR "class_create failed for uio\n"); 781beafc54cSHans J. Koch goto err_class_create; 782beafc54cSHans J. Koch } 783beafc54cSHans J. Koch return 0; 784beafc54cSHans J. Koch 785beafc54cSHans J. Koch err_class_create: 786beafc54cSHans J. Koch kfree(uio_class); 787beafc54cSHans J. Koch uio_class = NULL; 788beafc54cSHans J. Koch err_kzalloc: 789beafc54cSHans J. Koch uio_major_cleanup(); 790beafc54cSHans J. Koch exit: 791beafc54cSHans J. Koch return ret; 792beafc54cSHans J. Koch } 793beafc54cSHans J. Koch 794beafc54cSHans J. Koch static void release_uio_class(struct kref *kref) 795beafc54cSHans J. Koch { 796beafc54cSHans J. Koch /* Ok, we cheat as we know we only have one uio_class */ 797beafc54cSHans J. Koch class_destroy(uio_class->class); 798beafc54cSHans J. Koch kfree(uio_class); 799beafc54cSHans J. Koch uio_major_cleanup(); 800beafc54cSHans J. Koch uio_class = NULL; 801beafc54cSHans J. Koch } 802beafc54cSHans J. Koch 803beafc54cSHans J. Koch static void uio_class_destroy(void) 804beafc54cSHans J. Koch { 805beafc54cSHans J. Koch if (uio_class) 806beafc54cSHans J. Koch kref_put(&uio_class->kref, release_uio_class); 807beafc54cSHans J. Koch } 808beafc54cSHans J. Koch 809beafc54cSHans J. Koch /** 810beafc54cSHans J. Koch * uio_register_device - register a new userspace IO device 811beafc54cSHans J. Koch * @owner: module that creates the new device 812beafc54cSHans J. Koch * @parent: parent device 813beafc54cSHans J. Koch * @info: UIO device capabilities 814beafc54cSHans J. Koch * 815beafc54cSHans J. Koch * returns zero on success or a negative error code. 816beafc54cSHans J. Koch */ 817beafc54cSHans J. Koch int __uio_register_device(struct module *owner, 818beafc54cSHans J. Koch struct device *parent, 819beafc54cSHans J. Koch struct uio_info *info) 820beafc54cSHans J. Koch { 821beafc54cSHans J. Koch struct uio_device *idev; 822beafc54cSHans J. Koch int ret = 0; 823beafc54cSHans J. Koch 824beafc54cSHans J. Koch if (!parent || !info || !info->name || !info->version) 825beafc54cSHans J. Koch return -EINVAL; 826beafc54cSHans J. Koch 827beafc54cSHans J. Koch info->uio_dev = NULL; 828beafc54cSHans J. Koch 829beafc54cSHans J. Koch ret = init_uio_class(); 830beafc54cSHans J. Koch if (ret) 831beafc54cSHans J. Koch return ret; 832beafc54cSHans J. Koch 833beafc54cSHans J. Koch idev = kzalloc(sizeof(*idev), GFP_KERNEL); 834beafc54cSHans J. Koch if (!idev) { 835beafc54cSHans J. Koch ret = -ENOMEM; 836beafc54cSHans J. Koch goto err_kzalloc; 837beafc54cSHans J. Koch } 838beafc54cSHans J. Koch 839beafc54cSHans J. Koch idev->owner = owner; 840beafc54cSHans J. Koch idev->info = info; 841beafc54cSHans J. Koch init_waitqueue_head(&idev->wait); 842beafc54cSHans J. Koch atomic_set(&idev->event, 0); 843beafc54cSHans J. Koch 844beafc54cSHans J. Koch ret = uio_get_minor(idev); 845beafc54cSHans J. Koch if (ret) 846beafc54cSHans J. Koch goto err_get_minor; 847beafc54cSHans J. Koch 848a9b12619SGreg Kroah-Hartman idev->dev = device_create(uio_class->class, parent, 84943691da4SGreg Kroah-Hartman MKDEV(uio_major, idev->minor), idev, 850beafc54cSHans J. Koch "uio%d", idev->minor); 851beafc54cSHans J. Koch if (IS_ERR(idev->dev)) { 852beafc54cSHans J. Koch printk(KERN_ERR "UIO: device register failed\n"); 853beafc54cSHans J. Koch ret = PTR_ERR(idev->dev); 854beafc54cSHans J. Koch goto err_device_create; 855beafc54cSHans J. Koch } 856beafc54cSHans J. Koch 857beafc54cSHans J. Koch ret = uio_dev_add_attributes(idev); 858beafc54cSHans J. Koch if (ret) 859beafc54cSHans J. Koch goto err_uio_dev_add_attributes; 860beafc54cSHans J. Koch 861beafc54cSHans J. Koch info->uio_dev = idev; 862beafc54cSHans J. Koch 863beafc54cSHans J. Koch if (idev->info->irq >= 0) { 864beafc54cSHans J. Koch ret = request_irq(idev->info->irq, uio_interrupt, 865beafc54cSHans J. Koch idev->info->irq_flags, idev->info->name, idev); 866beafc54cSHans J. Koch if (ret) 867beafc54cSHans J. Koch goto err_request_irq; 868beafc54cSHans J. Koch } 869beafc54cSHans J. Koch 870beafc54cSHans J. Koch return 0; 871beafc54cSHans J. Koch 872beafc54cSHans J. Koch err_request_irq: 873beafc54cSHans J. Koch uio_dev_del_attributes(idev); 874beafc54cSHans J. Koch err_uio_dev_add_attributes: 875beafc54cSHans J. Koch device_destroy(uio_class->class, MKDEV(uio_major, idev->minor)); 876beafc54cSHans J. Koch err_device_create: 877beafc54cSHans J. Koch uio_free_minor(idev); 878beafc54cSHans J. Koch err_get_minor: 879beafc54cSHans J. Koch kfree(idev); 880beafc54cSHans J. Koch err_kzalloc: 881beafc54cSHans J. Koch uio_class_destroy(); 882beafc54cSHans J. Koch return ret; 883beafc54cSHans J. Koch } 884beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(__uio_register_device); 885beafc54cSHans J. Koch 886beafc54cSHans J. Koch /** 887beafc54cSHans J. Koch * uio_unregister_device - unregister a industrial IO device 888beafc54cSHans J. Koch * @info: UIO device capabilities 889beafc54cSHans J. Koch * 890beafc54cSHans J. Koch */ 891beafc54cSHans J. Koch void uio_unregister_device(struct uio_info *info) 892beafc54cSHans J. Koch { 893beafc54cSHans J. Koch struct uio_device *idev; 894beafc54cSHans J. Koch 895beafc54cSHans J. Koch if (!info || !info->uio_dev) 896beafc54cSHans J. Koch return; 897beafc54cSHans J. Koch 898beafc54cSHans J. Koch idev = info->uio_dev; 899beafc54cSHans J. Koch 900beafc54cSHans J. Koch uio_free_minor(idev); 901beafc54cSHans J. Koch 902beafc54cSHans J. Koch if (info->irq >= 0) 903beafc54cSHans J. Koch free_irq(info->irq, idev); 904beafc54cSHans J. Koch 905beafc54cSHans J. Koch uio_dev_del_attributes(idev); 906beafc54cSHans J. Koch 907beafc54cSHans J. Koch dev_set_drvdata(idev->dev, NULL); 908beafc54cSHans J. Koch device_destroy(uio_class->class, MKDEV(uio_major, idev->minor)); 909beafc54cSHans J. Koch kfree(idev); 910beafc54cSHans J. Koch uio_class_destroy(); 911beafc54cSHans J. Koch 912beafc54cSHans J. Koch return; 913beafc54cSHans J. Koch } 914beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_unregister_device); 915beafc54cSHans J. Koch 916beafc54cSHans J. Koch static int __init uio_init(void) 917beafc54cSHans J. Koch { 918beafc54cSHans J. Koch return 0; 919beafc54cSHans J. Koch } 920beafc54cSHans J. Koch 921beafc54cSHans J. Koch static void __exit uio_exit(void) 922beafc54cSHans J. Koch { 923beafc54cSHans J. Koch } 924beafc54cSHans J. Koch 925beafc54cSHans J. Koch module_init(uio_init) 926beafc54cSHans J. Koch module_exit(uio_exit) 927beafc54cSHans J. Koch MODULE_LICENSE("GPL v2"); 928