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> 23174cd4b1SIngo Molnar #include <linux/sched/signal.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 { 69171058fbSMichal Sojka return sprintf(buf, "0x%llx\n", (unsigned long long)mem->offs); 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); 21857c5f4dfSXiubo Li int ret; 21957c5f4dfSXiubo Li 22057c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 22157c5f4dfSXiubo Li if (!idev->info) { 22257c5f4dfSXiubo Li ret = -EINVAL; 22357c5f4dfSXiubo Li dev_err(dev, "the device has been unregistered\n"); 22457c5f4dfSXiubo Li goto out; 22557c5f4dfSXiubo Li } 22657c5f4dfSXiubo Li 22757c5f4dfSXiubo Li ret = sprintf(buf, "%s\n", idev->info->name); 22857c5f4dfSXiubo Li 22957c5f4dfSXiubo Li out: 23057c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 23157c5f4dfSXiubo Li return ret; 232beafc54cSHans J. Koch } 233c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(name); 234beafc54cSHans J. Koch 235c9dce927SGreg Kroah-Hartman static ssize_t version_show(struct device *dev, 236beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 237beafc54cSHans J. Koch { 238beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 23957c5f4dfSXiubo Li int ret; 24057c5f4dfSXiubo Li 24157c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 24257c5f4dfSXiubo Li if (!idev->info) { 24357c5f4dfSXiubo Li ret = -EINVAL; 24457c5f4dfSXiubo Li dev_err(dev, "the device has been unregistered\n"); 24557c5f4dfSXiubo Li goto out; 24657c5f4dfSXiubo Li } 24757c5f4dfSXiubo Li 24857c5f4dfSXiubo Li ret = sprintf(buf, "%s\n", idev->info->version); 24957c5f4dfSXiubo Li 25057c5f4dfSXiubo Li out: 25157c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 25257c5f4dfSXiubo Li return ret; 253beafc54cSHans J. Koch } 254c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(version); 255beafc54cSHans J. Koch 256c9dce927SGreg Kroah-Hartman static ssize_t event_show(struct device *dev, 257beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 258beafc54cSHans J. Koch { 259beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 26070a9156bSEric W. Biederman return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); 261beafc54cSHans J. Koch } 262c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(event); 263beafc54cSHans J. Koch 264c9dce927SGreg Kroah-Hartman static struct attribute *uio_attrs[] = { 265c9dce927SGreg Kroah-Hartman &dev_attr_name.attr, 266c9dce927SGreg Kroah-Hartman &dev_attr_version.attr, 267c9dce927SGreg Kroah-Hartman &dev_attr_event.attr, 268c9dce927SGreg Kroah-Hartman NULL, 269beafc54cSHans J. Koch }; 270c9dce927SGreg Kroah-Hartman ATTRIBUTE_GROUPS(uio); 271beafc54cSHans J. Koch 272c66fdab6SEric W. Biederman /* UIO class infrastructure */ 273c66fdab6SEric W. Biederman static struct class uio_class = { 274c66fdab6SEric W. Biederman .name = "uio", 275c9dce927SGreg Kroah-Hartman .dev_groups = uio_groups, 276beafc54cSHans J. Koch }; 277beafc54cSHans J. Koch 278beafc54cSHans J. Koch /* 279beafc54cSHans J. Koch * device functions 280beafc54cSHans J. Koch */ 281beafc54cSHans J. Koch static int uio_dev_add_attributes(struct uio_device *idev) 282beafc54cSHans J. Koch { 283beafc54cSHans J. Koch int ret; 284e70c412eSHans J. Koch int mi, pi; 285beafc54cSHans J. Koch int map_found = 0; 286e70c412eSHans J. Koch int portio_found = 0; 287beafc54cSHans J. Koch struct uio_mem *mem; 28881e7c6a6SGreg Kroah-Hartman struct uio_map *map; 289e70c412eSHans J. Koch struct uio_port *port; 290e70c412eSHans J. Koch struct uio_portio *portio; 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", 299a93e7b33SHamish Martin &idev->dev.kobj); 3000320a278SDan Carpenter if (!idev->map_dir) { 3010320a278SDan Carpenter ret = -ENOMEM; 302e70c412eSHans J. Koch goto err_map; 303beafc54cSHans J. Koch } 3040320a278SDan Carpenter } 30581e7c6a6SGreg Kroah-Hartman map = kzalloc(sizeof(*map), GFP_KERNEL); 3060320a278SDan Carpenter if (!map) { 3070320a278SDan Carpenter ret = -ENOMEM; 3080d835390SSuman Anna goto err_map; 3090320a278SDan Carpenter } 310f9cb074bSGreg Kroah-Hartman kobject_init(&map->kobj, &map_attr_type); 31181e7c6a6SGreg Kroah-Hartman map->mem = mem; 31281e7c6a6SGreg Kroah-Hartman mem->map = map; 313b2d6db58SGreg Kroah-Hartman ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); 314beafc54cSHans J. Koch if (ret) 31575f0aef6SCong Ding goto err_map_kobj; 31681e7c6a6SGreg Kroah-Hartman ret = kobject_uevent(&map->kobj, KOBJ_ADD); 31781e7c6a6SGreg Kroah-Hartman if (ret) 3180d835390SSuman Anna goto err_map_kobj; 319e70c412eSHans J. Koch } 320e70c412eSHans J. Koch 321e70c412eSHans J. Koch for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { 322e70c412eSHans J. Koch port = &idev->info->port[pi]; 323e70c412eSHans J. Koch if (port->size == 0) 324e70c412eSHans J. Koch break; 325e70c412eSHans J. Koch if (!portio_found) { 326e70c412eSHans J. Koch portio_found = 1; 327e70c412eSHans J. Koch idev->portio_dir = kobject_create_and_add("portio", 328a93e7b33SHamish Martin &idev->dev.kobj); 3290320a278SDan Carpenter if (!idev->portio_dir) { 3300320a278SDan Carpenter ret = -ENOMEM; 331e70c412eSHans J. Koch goto err_portio; 332e70c412eSHans J. Koch } 3330320a278SDan Carpenter } 334e70c412eSHans J. Koch portio = kzalloc(sizeof(*portio), GFP_KERNEL); 3350320a278SDan Carpenter if (!portio) { 3360320a278SDan Carpenter ret = -ENOMEM; 3370d835390SSuman Anna goto err_portio; 3380320a278SDan Carpenter } 339e70c412eSHans J. Koch kobject_init(&portio->kobj, &portio_attr_type); 340e70c412eSHans J. Koch portio->port = port; 341e70c412eSHans J. Koch port->portio = portio; 342e70c412eSHans J. Koch ret = kobject_add(&portio->kobj, idev->portio_dir, 343e70c412eSHans J. Koch "port%d", pi); 344e70c412eSHans J. Koch if (ret) 34575f0aef6SCong Ding goto err_portio_kobj; 346e70c412eSHans J. Koch ret = kobject_uevent(&portio->kobj, KOBJ_ADD); 347e70c412eSHans J. Koch if (ret) 3480d835390SSuman Anna goto err_portio_kobj; 349beafc54cSHans J. Koch } 350beafc54cSHans J. Koch 351beafc54cSHans J. Koch return 0; 352beafc54cSHans J. Koch 353e70c412eSHans J. Koch err_portio: 35475f0aef6SCong Ding pi--; 35575f0aef6SCong Ding err_portio_kobj: 35675f0aef6SCong Ding for (; pi >= 0; pi--) { 357e70c412eSHans J. Koch port = &idev->info->port[pi]; 358e70c412eSHans J. Koch portio = port->portio; 359e70c412eSHans J. Koch kobject_put(&portio->kobj); 360e70c412eSHans J. Koch } 361e70c412eSHans J. Koch kobject_put(idev->portio_dir); 362e70c412eSHans J. Koch err_map: 36375f0aef6SCong Ding mi--; 36475f0aef6SCong Ding err_map_kobj: 36575f0aef6SCong Ding for (; mi >= 0; mi--) { 366beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 36781e7c6a6SGreg Kroah-Hartman map = mem->map; 368c10997f6SGreg Kroah-Hartman kobject_put(&map->kobj); 369beafc54cSHans J. Koch } 370c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 371a93e7b33SHamish Martin dev_err(&idev->dev, "error creating sysfs files (%d)\n", ret); 372beafc54cSHans J. Koch return ret; 373beafc54cSHans J. Koch } 374beafc54cSHans J. Koch 375beafc54cSHans J. Koch static void uio_dev_del_attributes(struct uio_device *idev) 376beafc54cSHans J. Koch { 377e70c412eSHans J. Koch int i; 378beafc54cSHans J. Koch struct uio_mem *mem; 379e70c412eSHans J. Koch struct uio_port *port; 380e70c412eSHans J. Koch 381e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_MAPS; i++) { 382e70c412eSHans J. Koch mem = &idev->info->mem[i]; 383beafc54cSHans J. Koch if (mem->size == 0) 384beafc54cSHans J. Koch break; 385c10997f6SGreg Kroah-Hartman kobject_put(&mem->map->kobj); 386beafc54cSHans J. Koch } 387c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 388e70c412eSHans J. Koch 389e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { 390e70c412eSHans J. Koch port = &idev->info->port[i]; 391e70c412eSHans J. Koch if (port->size == 0) 392e70c412eSHans J. Koch break; 393e70c412eSHans J. Koch kobject_put(&port->portio->kobj); 394e70c412eSHans J. Koch } 395e70c412eSHans J. Koch kobject_put(idev->portio_dir); 396beafc54cSHans J. Koch } 397beafc54cSHans J. Koch 398beafc54cSHans J. Koch static int uio_get_minor(struct uio_device *idev) 399beafc54cSHans J. Koch { 400beafc54cSHans J. Koch int retval = -ENOMEM; 401beafc54cSHans J. Koch 402beafc54cSHans J. Koch mutex_lock(&minor_lock); 4036d770931STejun Heo retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL); 4046d770931STejun Heo if (retval >= 0) { 4056d770931STejun Heo idev->minor = retval; 4065ed0505cSDamian Hobson-Garcia retval = 0; 4076d770931STejun Heo } else if (retval == -ENOSPC) { 408a93e7b33SHamish Martin dev_err(&idev->dev, "too many uio devices\n"); 409c6edc42fSHillf Danton retval = -EINVAL; 410c6edc42fSHillf Danton } 411beafc54cSHans J. Koch mutex_unlock(&minor_lock); 412beafc54cSHans J. Koch return retval; 413beafc54cSHans J. Koch } 414beafc54cSHans J. Koch 415beafc54cSHans J. Koch static void uio_free_minor(struct uio_device *idev) 416beafc54cSHans J. Koch { 4170d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 418beafc54cSHans J. Koch idr_remove(&uio_idr, idev->minor); 4190d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 420beafc54cSHans J. Koch } 421beafc54cSHans J. Koch 422beafc54cSHans J. Koch /** 423beafc54cSHans J. Koch * uio_event_notify - trigger an interrupt event 424beafc54cSHans J. Koch * @info: UIO device capabilities 425beafc54cSHans J. Koch */ 426beafc54cSHans J. Koch void uio_event_notify(struct uio_info *info) 427beafc54cSHans J. Koch { 428beafc54cSHans J. Koch struct uio_device *idev = info->uio_dev; 429beafc54cSHans J. Koch 430beafc54cSHans J. Koch atomic_inc(&idev->event); 431beafc54cSHans J. Koch wake_up_interruptible(&idev->wait); 432beafc54cSHans J. Koch kill_fasync(&idev->async_queue, SIGIO, POLL_IN); 433beafc54cSHans J. Koch } 434beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_event_notify); 435beafc54cSHans J. Koch 436beafc54cSHans J. Koch /** 437beafc54cSHans J. Koch * uio_interrupt - hardware interrupt handler 438beafc54cSHans J. Koch * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer 439beafc54cSHans J. Koch * @dev_id: Pointer to the devices uio_device structure 440beafc54cSHans J. Koch */ 441beafc54cSHans J. Koch static irqreturn_t uio_interrupt(int irq, void *dev_id) 442beafc54cSHans J. Koch { 443beafc54cSHans J. Koch struct uio_device *idev = (struct uio_device *)dev_id; 44457c5f4dfSXiubo Li irqreturn_t ret; 445beafc54cSHans J. Koch 44657c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 44757c5f4dfSXiubo Li 44857c5f4dfSXiubo Li ret = idev->info->handler(irq, idev->info); 449beafc54cSHans J. Koch if (ret == IRQ_HANDLED) 450beafc54cSHans J. Koch uio_event_notify(idev->info); 451beafc54cSHans J. Koch 45257c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 453beafc54cSHans J. Koch return ret; 454beafc54cSHans J. Koch } 455beafc54cSHans J. Koch 456beafc54cSHans J. Koch struct uio_listener { 457beafc54cSHans J. Koch struct uio_device *dev; 458beafc54cSHans J. Koch s32 event_count; 459beafc54cSHans J. Koch }; 460beafc54cSHans J. Koch 461beafc54cSHans J. Koch static int uio_open(struct inode *inode, struct file *filep) 462beafc54cSHans J. Koch { 463beafc54cSHans J. Koch struct uio_device *idev; 464beafc54cSHans J. Koch struct uio_listener *listener; 465beafc54cSHans J. Koch int ret = 0; 466beafc54cSHans J. Koch 4670d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 468beafc54cSHans J. Koch idev = idr_find(&uio_idr, iminor(inode)); 4690d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 470fbc8a81dSJonathan Corbet if (!idev) { 471fbc8a81dSJonathan Corbet ret = -ENODEV; 472fbc8a81dSJonathan Corbet goto out; 473fbc8a81dSJonathan Corbet } 474beafc54cSHans J. Koch 475a93e7b33SHamish Martin get_device(&idev->dev); 476a93e7b33SHamish Martin 477fbc8a81dSJonathan Corbet if (!try_module_get(idev->owner)) { 478fbc8a81dSJonathan Corbet ret = -ENODEV; 479a93e7b33SHamish Martin goto err_module_get; 480fbc8a81dSJonathan Corbet } 481610ad506SUwe Kleine-König 482beafc54cSHans J. Koch listener = kmalloc(sizeof(*listener), GFP_KERNEL); 483610ad506SUwe Kleine-König if (!listener) { 484610ad506SUwe Kleine-König ret = -ENOMEM; 485610ad506SUwe Kleine-König goto err_alloc_listener; 486610ad506SUwe Kleine-König } 487beafc54cSHans J. Koch 488beafc54cSHans J. Koch listener->dev = idev; 489beafc54cSHans J. Koch listener->event_count = atomic_read(&idev->event); 490beafc54cSHans J. Koch filep->private_data = listener; 491beafc54cSHans J. Koch 492543af586SXiubo Li mutex_lock(&idev->info_lock); 49357c5f4dfSXiubo Li if (!idev->info) { 49457c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 49557c5f4dfSXiubo Li ret = -EINVAL; 49657c5f4dfSXiubo Li goto err_alloc_listener; 49757c5f4dfSXiubo Li } 49857c5f4dfSXiubo Li 499a93e7b33SHamish Martin if (idev->info && idev->info->open) 500beafc54cSHans J. Koch ret = idev->info->open(idev->info, inode); 501543af586SXiubo Li mutex_unlock(&idev->info_lock); 502610ad506SUwe Kleine-König if (ret) 503610ad506SUwe Kleine-König goto err_infoopen; 504a93e7b33SHamish Martin 505610ad506SUwe Kleine-König return 0; 506610ad506SUwe Kleine-König 507610ad506SUwe Kleine-König err_infoopen: 508beafc54cSHans J. Koch kfree(listener); 509610ad506SUwe Kleine-König 5100d4a7bc1SJonathan Corbet err_alloc_listener: 511610ad506SUwe Kleine-König module_put(idev->owner); 512beafc54cSHans J. Koch 513a93e7b33SHamish Martin err_module_get: 514a93e7b33SHamish Martin put_device(&idev->dev); 515a93e7b33SHamish Martin 516fbc8a81dSJonathan Corbet out: 517beafc54cSHans J. Koch return ret; 518beafc54cSHans J. Koch } 519beafc54cSHans J. Koch 520beafc54cSHans J. Koch static int uio_fasync(int fd, struct file *filep, int on) 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 return fasync_helper(fd, filep, on, &idev->async_queue); 526beafc54cSHans J. Koch } 527beafc54cSHans J. Koch 528beafc54cSHans J. Koch static int uio_release(struct inode *inode, struct file *filep) 529beafc54cSHans J. Koch { 530beafc54cSHans J. Koch int ret = 0; 531beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 532beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 533beafc54cSHans J. Koch 534543af586SXiubo Li mutex_lock(&idev->info_lock); 535a93e7b33SHamish Martin if (idev->info && idev->info->release) 536beafc54cSHans J. Koch ret = idev->info->release(idev->info, inode); 537543af586SXiubo Li mutex_unlock(&idev->info_lock); 538610ad506SUwe Kleine-König 539beafc54cSHans J. Koch module_put(idev->owner); 540beafc54cSHans J. Koch kfree(listener); 541a93e7b33SHamish Martin put_device(&idev->dev); 542beafc54cSHans J. Koch return ret; 543beafc54cSHans J. Koch } 544beafc54cSHans J. Koch 545afc9a42bSAl Viro static __poll_t uio_poll(struct file *filep, poll_table *wait) 546beafc54cSHans J. Koch { 547beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 548beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 549a93e7b33SHamish Martin __poll_t ret = 0; 550beafc54cSHans J. Koch 551543af586SXiubo Li mutex_lock(&idev->info_lock); 552a93e7b33SHamish Martin if (!idev->info || !idev->info->irq) 553a93e7b33SHamish Martin ret = -EIO; 554543af586SXiubo Li mutex_unlock(&idev->info_lock); 555a93e7b33SHamish Martin 556a93e7b33SHamish Martin if (ret) 557a93e7b33SHamish Martin return ret; 558beafc54cSHans J. Koch 559beafc54cSHans J. Koch poll_wait(filep, &idev->wait, wait); 560beafc54cSHans J. Koch if (listener->event_count != atomic_read(&idev->event)) 561a9a08845SLinus Torvalds return EPOLLIN | EPOLLRDNORM; 562beafc54cSHans J. Koch return 0; 563beafc54cSHans J. Koch } 564beafc54cSHans J. Koch 565beafc54cSHans J. Koch static ssize_t uio_read(struct file *filep, char __user *buf, 566beafc54cSHans J. Koch size_t count, loff_t *ppos) 567beafc54cSHans J. Koch { 568beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 569beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 570beafc54cSHans J. Koch DECLARE_WAITQUEUE(wait, current); 571a93e7b33SHamish Martin ssize_t retval = 0; 572beafc54cSHans J. Koch s32 event_count; 573beafc54cSHans J. Koch 574543af586SXiubo Li mutex_lock(&idev->info_lock); 575a93e7b33SHamish Martin if (!idev->info || !idev->info->irq) 576a93e7b33SHamish Martin retval = -EIO; 577543af586SXiubo Li mutex_unlock(&idev->info_lock); 578a93e7b33SHamish Martin 579a93e7b33SHamish Martin if (retval) 580a93e7b33SHamish Martin return retval; 581beafc54cSHans J. Koch 582beafc54cSHans J. Koch if (count != sizeof(s32)) 583beafc54cSHans J. Koch return -EINVAL; 584beafc54cSHans J. Koch 585beafc54cSHans J. Koch add_wait_queue(&idev->wait, &wait); 586beafc54cSHans J. Koch 587beafc54cSHans J. Koch do { 588beafc54cSHans J. Koch set_current_state(TASK_INTERRUPTIBLE); 589beafc54cSHans J. Koch 590beafc54cSHans J. Koch event_count = atomic_read(&idev->event); 591beafc54cSHans J. Koch if (event_count != listener->event_count) { 592edce5e6fSMichal Hocko __set_current_state(TASK_RUNNING); 593beafc54cSHans J. Koch if (copy_to_user(buf, &event_count, count)) 594beafc54cSHans J. Koch retval = -EFAULT; 595beafc54cSHans J. Koch else { 596beafc54cSHans J. Koch listener->event_count = event_count; 597beafc54cSHans J. Koch retval = count; 598beafc54cSHans J. Koch } 599beafc54cSHans J. Koch break; 600beafc54cSHans J. Koch } 601beafc54cSHans J. Koch 602beafc54cSHans J. Koch if (filep->f_flags & O_NONBLOCK) { 603beafc54cSHans J. Koch retval = -EAGAIN; 604beafc54cSHans J. Koch break; 605beafc54cSHans J. Koch } 606beafc54cSHans J. Koch 607beafc54cSHans J. Koch if (signal_pending(current)) { 608beafc54cSHans J. Koch retval = -ERESTARTSYS; 609beafc54cSHans J. Koch break; 610beafc54cSHans J. Koch } 611beafc54cSHans J. Koch schedule(); 612beafc54cSHans J. Koch } while (1); 613beafc54cSHans J. Koch 614beafc54cSHans J. Koch __set_current_state(TASK_RUNNING); 615beafc54cSHans J. Koch remove_wait_queue(&idev->wait, &wait); 616beafc54cSHans J. Koch 617beafc54cSHans J. Koch return retval; 618beafc54cSHans J. Koch } 619beafc54cSHans J. Koch 620328a14e7SHans J. Koch static ssize_t uio_write(struct file *filep, const char __user *buf, 621328a14e7SHans J. Koch size_t count, loff_t *ppos) 622328a14e7SHans J. Koch { 623328a14e7SHans J. Koch struct uio_listener *listener = filep->private_data; 624328a14e7SHans J. Koch struct uio_device *idev = listener->dev; 625328a14e7SHans J. Koch ssize_t retval; 626328a14e7SHans J. Koch s32 irq_on; 627328a14e7SHans J. Koch 628543af586SXiubo Li mutex_lock(&idev->info_lock); 62957c5f4dfSXiubo Li if (!idev->info) { 63057c5f4dfSXiubo Li retval = -EINVAL; 63157c5f4dfSXiubo Li goto out; 63257c5f4dfSXiubo Li } 63357c5f4dfSXiubo Li 634a93e7b33SHamish Martin if (!idev->info || !idev->info->irq) { 63581daa406SHamish Martin retval = -EIO; 63681daa406SHamish Martin goto out; 63781daa406SHamish Martin } 638328a14e7SHans J. Koch 63981daa406SHamish Martin if (count != sizeof(s32)) { 64081daa406SHamish Martin retval = -EINVAL; 64181daa406SHamish Martin goto out; 64281daa406SHamish Martin } 643328a14e7SHans J. Koch 64481daa406SHamish Martin if (!idev->info->irqcontrol) { 64581daa406SHamish Martin retval = -ENOSYS; 64681daa406SHamish Martin goto out; 64781daa406SHamish Martin } 648328a14e7SHans J. Koch 64981daa406SHamish Martin if (copy_from_user(&irq_on, buf, count)) { 65081daa406SHamish Martin retval = -EFAULT; 65181daa406SHamish Martin goto out; 65281daa406SHamish Martin } 653328a14e7SHans J. Koch 654328a14e7SHans J. Koch retval = idev->info->irqcontrol(idev->info, irq_on); 655328a14e7SHans J. Koch 65681daa406SHamish Martin out: 657543af586SXiubo Li mutex_unlock(&idev->info_lock); 658328a14e7SHans J. Koch return retval ? retval : sizeof(s32); 659328a14e7SHans J. Koch } 660328a14e7SHans J. Koch 661beafc54cSHans J. Koch static int uio_find_mem_index(struct vm_area_struct *vma) 662beafc54cSHans J. Koch { 663beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 664beafc54cSHans J. Koch 665f0c554fdSHillf Danton if (vma->vm_pgoff < MAX_UIO_MAPS) { 666f0c554fdSHillf Danton if (idev->info->mem[vma->vm_pgoff].size == 0) 667beafc54cSHans J. Koch return -1; 668f0c554fdSHillf Danton return (int)vma->vm_pgoff; 669beafc54cSHans J. Koch } 670beafc54cSHans J. Koch return -1; 671beafc54cSHans J. Koch } 672beafc54cSHans J. Koch 6739b85e95aSSouptick Joarder static vm_fault_t uio_vma_fault(struct vm_fault *vmf) 674beafc54cSHans J. Koch { 67511bac800SDave Jiang struct uio_device *idev = vmf->vma->vm_private_data; 676a18b630dSNick Piggin struct page *page; 67702683ffdSAndrew G. Harvey unsigned long offset; 678e6418fccSBen Hutchings void *addr; 67957c5f4dfSXiubo Li int ret = 0; 68057c5f4dfSXiubo Li int mi; 681beafc54cSHans J. Koch 68257c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 68357c5f4dfSXiubo Li if (!idev->info) { 68457c5f4dfSXiubo Li ret = VM_FAULT_SIGBUS; 68557c5f4dfSXiubo Li goto out; 68657c5f4dfSXiubo Li } 68757c5f4dfSXiubo Li 68857c5f4dfSXiubo Li mi = uio_find_mem_index(vmf->vma); 68957c5f4dfSXiubo Li if (mi < 0) { 69057c5f4dfSXiubo Li ret = VM_FAULT_SIGBUS; 69157c5f4dfSXiubo Li goto out; 69257c5f4dfSXiubo Li } 693beafc54cSHans J. Koch 69402683ffdSAndrew G. Harvey /* 69502683ffdSAndrew G. Harvey * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 69602683ffdSAndrew G. Harvey * to use mem[N]. 69702683ffdSAndrew G. Harvey */ 69802683ffdSAndrew G. Harvey offset = (vmf->pgoff - mi) << PAGE_SHIFT; 69902683ffdSAndrew G. Harvey 700e6418fccSBen Hutchings addr = (void *)(unsigned long)idev->info->mem[mi].addr + offset; 701beafc54cSHans J. Koch if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) 702e6418fccSBen Hutchings page = virt_to_page(addr); 703beafc54cSHans J. Koch else 704e6418fccSBen Hutchings page = vmalloc_to_page(addr); 705beafc54cSHans J. Koch get_page(page); 706a18b630dSNick Piggin vmf->page = page; 70757c5f4dfSXiubo Li 70857c5f4dfSXiubo Li out: 70957c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 71057c5f4dfSXiubo Li 71157c5f4dfSXiubo Li return ret; 712beafc54cSHans J. Koch } 713beafc54cSHans J. Koch 7147294151dSUwe Kleine-König static const struct vm_operations_struct uio_logical_vm_ops = { 715a18b630dSNick Piggin .fault = uio_vma_fault, 716beafc54cSHans J. Koch }; 717beafc54cSHans J. Koch 7187294151dSUwe Kleine-König static int uio_mmap_logical(struct vm_area_struct *vma) 7197294151dSUwe Kleine-König { 7207294151dSUwe Kleine-König vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 7217294151dSUwe Kleine-König vma->vm_ops = &uio_logical_vm_ops; 7227294151dSUwe Kleine-König return 0; 7237294151dSUwe Kleine-König } 7247294151dSUwe Kleine-König 7257294151dSUwe Kleine-König static const struct vm_operations_struct uio_physical_vm_ops = { 7267294151dSUwe Kleine-König #ifdef CONFIG_HAVE_IOREMAP_PROT 7277294151dSUwe Kleine-König .access = generic_access_phys, 7287294151dSUwe Kleine-König #endif 7297294151dSUwe Kleine-König }; 7307294151dSUwe Kleine-König 731beafc54cSHans J. Koch static int uio_mmap_physical(struct vm_area_struct *vma) 732beafc54cSHans J. Koch { 733beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 734beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 7357314e613SLinus Torvalds struct uio_mem *mem; 73657c5f4dfSXiubo Li 737beafc54cSHans J. Koch if (mi < 0) 738beafc54cSHans J. Koch return -EINVAL; 7397314e613SLinus Torvalds mem = idev->info->mem + mi; 7407314e613SLinus Torvalds 741b6550287SLinus Torvalds if (mem->addr & ~PAGE_MASK) 742b6550287SLinus Torvalds return -ENODEV; 743b29f680cSGreg Kroah-Hartman if (vma->vm_end - vma->vm_start > mem->size) 7447314e613SLinus Torvalds return -EINVAL; 745beafc54cSHans J. Koch 7467294151dSUwe Kleine-König vma->vm_ops = &uio_physical_vm_ops; 747c9698d6bSJean-Samuel Chenard vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 748c9698d6bSJean-Samuel Chenard 7497314e613SLinus Torvalds /* 7507314e613SLinus Torvalds * We cannot use the vm_iomap_memory() helper here, 7517314e613SLinus Torvalds * because vma->vm_pgoff is the map index we looked 7527314e613SLinus Torvalds * up above in uio_find_mem_index(), rather than an 7537314e613SLinus Torvalds * actual page offset into the mmap. 7547314e613SLinus Torvalds * 7557314e613SLinus Torvalds * So we just do the physical mmap without a page 7567314e613SLinus Torvalds * offset. 7577314e613SLinus Torvalds */ 758beafc54cSHans J. Koch return remap_pfn_range(vma, 759beafc54cSHans J. Koch vma->vm_start, 7607314e613SLinus Torvalds mem->addr >> PAGE_SHIFT, 761beafc54cSHans J. Koch vma->vm_end - vma->vm_start, 762beafc54cSHans J. Koch vma->vm_page_prot); 763beafc54cSHans J. Koch } 764beafc54cSHans J. Koch 765beafc54cSHans J. Koch static int uio_mmap(struct file *filep, struct vm_area_struct *vma) 766beafc54cSHans J. Koch { 767beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 768beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 769beafc54cSHans J. Koch int mi; 770beafc54cSHans J. Koch unsigned long requested_pages, actual_pages; 771beafc54cSHans J. Koch int ret = 0; 772beafc54cSHans J. Koch 773beafc54cSHans J. Koch if (vma->vm_end < vma->vm_start) 774beafc54cSHans J. Koch return -EINVAL; 775beafc54cSHans J. Koch 776beafc54cSHans J. Koch vma->vm_private_data = idev; 777beafc54cSHans J. Koch 77857c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 77957c5f4dfSXiubo Li if (!idev->info) { 78057c5f4dfSXiubo Li ret = -EINVAL; 78157c5f4dfSXiubo Li goto out; 78257c5f4dfSXiubo Li } 78357c5f4dfSXiubo Li 784beafc54cSHans J. Koch mi = uio_find_mem_index(vma); 78557c5f4dfSXiubo Li if (mi < 0) { 78657c5f4dfSXiubo Li ret = -EINVAL; 78757c5f4dfSXiubo Li goto out; 78857c5f4dfSXiubo Li } 789beafc54cSHans J. Koch 79052c2dad9SLibin requested_pages = vma_pages(vma); 7916da2d377SIan Abbott actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) 7926da2d377SIan Abbott + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; 79357c5f4dfSXiubo Li if (requested_pages > actual_pages) { 79457c5f4dfSXiubo Li ret = -EINVAL; 79557c5f4dfSXiubo Li goto out; 79657c5f4dfSXiubo Li } 797beafc54cSHans J. Koch 798beafc54cSHans J. Koch if (idev->info->mmap) { 799beafc54cSHans J. Koch ret = idev->info->mmap(idev->info, vma); 80057c5f4dfSXiubo Li goto out; 801beafc54cSHans J. Koch } 802beafc54cSHans J. Koch 803beafc54cSHans J. Koch switch (idev->info->mem[mi].memtype) { 804beafc54cSHans J. Koch case UIO_MEM_PHYS: 80557c5f4dfSXiubo Li ret = uio_mmap_physical(vma); 80657c5f4dfSXiubo Li break; 807beafc54cSHans J. Koch case UIO_MEM_LOGICAL: 808beafc54cSHans J. Koch case UIO_MEM_VIRTUAL: 80957c5f4dfSXiubo Li ret = uio_mmap_logical(vma); 81057c5f4dfSXiubo Li break; 811beafc54cSHans J. Koch default: 81257c5f4dfSXiubo Li ret = -EINVAL; 813beafc54cSHans J. Koch } 81457c5f4dfSXiubo Li 81557c5f4dfSXiubo Li out: 81657c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 81757c5f4dfSXiubo Li return 0; 818beafc54cSHans J. Koch } 819beafc54cSHans J. Koch 8204f014691SJan Engelhardt static const struct file_operations uio_fops = { 821beafc54cSHans J. Koch .owner = THIS_MODULE, 822beafc54cSHans J. Koch .open = uio_open, 823beafc54cSHans J. Koch .release = uio_release, 824beafc54cSHans J. Koch .read = uio_read, 825328a14e7SHans J. Koch .write = uio_write, 826beafc54cSHans J. Koch .mmap = uio_mmap, 827beafc54cSHans J. Koch .poll = uio_poll, 828beafc54cSHans J. Koch .fasync = uio_fasync, 8296038f373SArnd Bergmann .llseek = noop_llseek, 830beafc54cSHans J. Koch }; 831beafc54cSHans J. Koch 832beafc54cSHans J. Koch static int uio_major_init(void) 833beafc54cSHans J. Koch { 83491960a46SEric W. Biederman static const char name[] = "uio"; 83591960a46SEric W. Biederman struct cdev *cdev = NULL; 83691960a46SEric W. Biederman dev_t uio_dev = 0; 83791960a46SEric W. Biederman int result; 83891960a46SEric W. Biederman 83991960a46SEric W. Biederman result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); 84091960a46SEric W. Biederman if (result) 84191960a46SEric W. Biederman goto out; 84291960a46SEric W. Biederman 84391960a46SEric W. Biederman result = -ENOMEM; 84491960a46SEric W. Biederman cdev = cdev_alloc(); 84591960a46SEric W. Biederman if (!cdev) 84691960a46SEric W. Biederman goto out_unregister; 84791960a46SEric W. Biederman 84891960a46SEric W. Biederman cdev->owner = THIS_MODULE; 84991960a46SEric W. Biederman cdev->ops = &uio_fops; 85091960a46SEric W. Biederman kobject_set_name(&cdev->kobj, "%s", name); 85191960a46SEric W. Biederman 85291960a46SEric W. Biederman result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); 85391960a46SEric W. Biederman if (result) 85491960a46SEric W. Biederman goto out_put; 85591960a46SEric W. Biederman 85691960a46SEric W. Biederman uio_major = MAJOR(uio_dev); 85791960a46SEric W. Biederman uio_cdev = cdev; 858d80df1ceSWanlong Gao return 0; 85991960a46SEric W. Biederman out_put: 86091960a46SEric W. Biederman kobject_put(&cdev->kobj); 86191960a46SEric W. Biederman out_unregister: 86291960a46SEric W. Biederman unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); 863d80df1ceSWanlong Gao out: 864d80df1ceSWanlong Gao return result; 865beafc54cSHans J. Koch } 866beafc54cSHans J. Koch 867beafc54cSHans J. Koch static void uio_major_cleanup(void) 868beafc54cSHans J. Koch { 86991960a46SEric W. Biederman unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); 87091960a46SEric W. Biederman cdev_del(uio_cdev); 871beafc54cSHans J. Koch } 872beafc54cSHans J. Koch 873beafc54cSHans J. Koch static int init_uio_class(void) 874beafc54cSHans J. Koch { 8753d4f9d76SEric W. Biederman int ret; 876beafc54cSHans J. Koch 877beafc54cSHans J. Koch /* This is the first time in here, set everything up properly */ 878beafc54cSHans J. Koch ret = uio_major_init(); 879beafc54cSHans J. Koch if (ret) 880beafc54cSHans J. Koch goto exit; 881beafc54cSHans J. Koch 882c66fdab6SEric W. Biederman ret = class_register(&uio_class); 883c66fdab6SEric W. Biederman if (ret) { 884c66fdab6SEric W. Biederman printk(KERN_ERR "class_register failed for uio\n"); 885c66fdab6SEric W. Biederman goto err_class_register; 886beafc54cSHans J. Koch } 887beafc54cSHans J. Koch return 0; 888beafc54cSHans J. Koch 889c66fdab6SEric W. Biederman err_class_register: 890beafc54cSHans J. Koch uio_major_cleanup(); 891beafc54cSHans J. Koch exit: 892beafc54cSHans J. Koch return ret; 893beafc54cSHans J. Koch } 894beafc54cSHans J. Koch 8953d4f9d76SEric W. Biederman static void release_uio_class(void) 896beafc54cSHans J. Koch { 897c66fdab6SEric W. Biederman class_unregister(&uio_class); 898beafc54cSHans J. Koch uio_major_cleanup(); 899beafc54cSHans J. Koch } 900beafc54cSHans J. Koch 901a93e7b33SHamish Martin static void uio_device_release(struct device *dev) 902a93e7b33SHamish Martin { 903a93e7b33SHamish Martin struct uio_device *idev = dev_get_drvdata(dev); 904a93e7b33SHamish Martin 905a93e7b33SHamish Martin kfree(idev); 906a93e7b33SHamish Martin } 907a93e7b33SHamish Martin 908beafc54cSHans J. Koch /** 909beafc54cSHans J. Koch * uio_register_device - register a new userspace IO device 910beafc54cSHans J. Koch * @owner: module that creates the new device 911beafc54cSHans J. Koch * @parent: parent device 912beafc54cSHans J. Koch * @info: UIO device capabilities 913beafc54cSHans J. Koch * 914beafc54cSHans J. Koch * returns zero on success or a negative error code. 915beafc54cSHans J. Koch */ 916beafc54cSHans J. Koch int __uio_register_device(struct module *owner, 917beafc54cSHans J. Koch struct device *parent, 918beafc54cSHans J. Koch struct uio_info *info) 919beafc54cSHans J. Koch { 920beafc54cSHans J. Koch struct uio_device *idev; 921beafc54cSHans J. Koch int ret = 0; 922beafc54cSHans J. Koch 923beafc54cSHans J. Koch if (!parent || !info || !info->name || !info->version) 924beafc54cSHans J. Koch return -EINVAL; 925beafc54cSHans J. Koch 926beafc54cSHans J. Koch info->uio_dev = NULL; 927beafc54cSHans J. Koch 928a93e7b33SHamish Martin idev = kzalloc(sizeof(*idev), GFP_KERNEL); 929beafc54cSHans J. Koch if (!idev) { 930e6789cd3SMichal Simek return -ENOMEM; 931beafc54cSHans J. Koch } 932beafc54cSHans J. Koch 933beafc54cSHans J. Koch idev->owner = owner; 934beafc54cSHans J. Koch idev->info = info; 935543af586SXiubo Li mutex_init(&idev->info_lock); 936beafc54cSHans J. Koch init_waitqueue_head(&idev->wait); 937beafc54cSHans J. Koch atomic_set(&idev->event, 0); 938beafc54cSHans J. Koch 939beafc54cSHans J. Koch ret = uio_get_minor(idev); 940beafc54cSHans J. Koch if (ret) 941e6789cd3SMichal Simek return ret; 942beafc54cSHans J. Koch 943a93e7b33SHamish Martin idev->dev.devt = MKDEV(uio_major, idev->minor); 944a93e7b33SHamish Martin idev->dev.class = &uio_class; 945a93e7b33SHamish Martin idev->dev.parent = parent; 946a93e7b33SHamish Martin idev->dev.release = uio_device_release; 947a93e7b33SHamish Martin dev_set_drvdata(&idev->dev, idev); 948a93e7b33SHamish Martin 949a93e7b33SHamish Martin ret = dev_set_name(&idev->dev, "uio%d", idev->minor); 950a93e7b33SHamish Martin if (ret) 951beafc54cSHans J. Koch goto err_device_create; 952a93e7b33SHamish Martin 953a93e7b33SHamish Martin ret = device_register(&idev->dev); 954a93e7b33SHamish Martin if (ret) 955a93e7b33SHamish Martin goto err_device_create; 956beafc54cSHans J. Koch 957beafc54cSHans J. Koch ret = uio_dev_add_attributes(idev); 958beafc54cSHans J. Koch if (ret) 959beafc54cSHans J. Koch goto err_uio_dev_add_attributes; 960beafc54cSHans J. Koch 961beafc54cSHans J. Koch info->uio_dev = idev; 962beafc54cSHans J. Koch 9636427a765SEric W. Biederman if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { 964a087146cSBrian Russell /* 965a087146cSBrian Russell * Note that we deliberately don't use devm_request_irq 966a087146cSBrian Russell * here. The parent module can unregister the UIO device 967a087146cSBrian Russell * and call pci_disable_msi, which requires that this 968a087146cSBrian Russell * irq has been freed. However, the device may have open 969a087146cSBrian Russell * FDs at the time of unregister and therefore may not be 970a087146cSBrian Russell * freed until they are released. 971a087146cSBrian Russell */ 9729421e45fSXiubo Li ret = request_threaded_irq(info->irq, NULL, uio_interrupt, 9736427a765SEric W. Biederman info->irq_flags, info->name, idev); 9749421e45fSXiubo Li 975beafc54cSHans J. Koch if (ret) 976beafc54cSHans J. Koch goto err_request_irq; 977beafc54cSHans J. Koch } 978beafc54cSHans J. Koch 979beafc54cSHans J. Koch return 0; 980beafc54cSHans J. Koch 981beafc54cSHans J. Koch err_request_irq: 982beafc54cSHans J. Koch uio_dev_del_attributes(idev); 983beafc54cSHans J. Koch err_uio_dev_add_attributes: 984a93e7b33SHamish Martin device_unregister(&idev->dev); 985beafc54cSHans J. Koch err_device_create: 986beafc54cSHans J. Koch uio_free_minor(idev); 987beafc54cSHans J. Koch return ret; 988beafc54cSHans J. Koch } 989beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(__uio_register_device); 990beafc54cSHans J. Koch 991beafc54cSHans J. Koch /** 992beafc54cSHans J. Koch * uio_unregister_device - unregister a industrial IO device 993beafc54cSHans J. Koch * @info: UIO device capabilities 994beafc54cSHans J. Koch * 995beafc54cSHans J. Koch */ 996beafc54cSHans J. Koch void uio_unregister_device(struct uio_info *info) 997beafc54cSHans J. Koch { 998beafc54cSHans J. Koch struct uio_device *idev; 999beafc54cSHans J. Koch 1000beafc54cSHans J. Koch if (!info || !info->uio_dev) 1001beafc54cSHans J. Koch return; 1002beafc54cSHans J. Koch 1003beafc54cSHans J. Koch idev = info->uio_dev; 1004beafc54cSHans J. Koch 1005beafc54cSHans J. Koch uio_free_minor(idev); 1006beafc54cSHans J. Koch 100757c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 1008beafc54cSHans J. Koch uio_dev_del_attributes(idev); 1009beafc54cSHans J. Koch 10109ff2c132SStephen Hemminger if (info->irq && info->irq != UIO_IRQ_CUSTOM) 10119ff2c132SStephen Hemminger free_irq(info->irq, idev); 1012a087146cSBrian Russell 1013a93e7b33SHamish Martin idev->info = NULL; 1014543af586SXiubo Li mutex_unlock(&idev->info_lock); 1015a93e7b33SHamish Martin 1016a93e7b33SHamish Martin device_unregister(&idev->dev); 1017beafc54cSHans J. Koch 1018beafc54cSHans J. Koch return; 1019beafc54cSHans J. Koch } 1020beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_unregister_device); 1021beafc54cSHans J. Koch 1022beafc54cSHans J. Koch static int __init uio_init(void) 1023beafc54cSHans J. Koch { 10243d4f9d76SEric W. Biederman return init_uio_class(); 1025beafc54cSHans J. Koch } 1026beafc54cSHans J. Koch 1027beafc54cSHans J. Koch static void __exit uio_exit(void) 1028beafc54cSHans J. Koch { 10293d4f9d76SEric W. Biederman release_uio_class(); 1030e2ef9393SJohannes Thumshirn idr_destroy(&uio_idr); 1031beafc54cSHans J. Koch } 1032beafc54cSHans J. Koch 1033beafc54cSHans J. Koch module_init(uio_init) 1034beafc54cSHans J. Koch module_exit(uio_exit) 1035beafc54cSHans J. Koch MODULE_LICENSE("GPL v2"); 1036