1fbb5858cSStephen Hemminger // SPDX-License-Identifier: GPL-2.0 2beafc54cSHans J. Koch /* 3beafc54cSHans J. Koch * drivers/uio/uio.c 4beafc54cSHans J. Koch * 5beafc54cSHans J. Koch * Copyright(C) 2005, Benedikt Spranger <b.spranger@linutronix.de> 6beafc54cSHans J. Koch * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de> 7318af55dSHans J. Koch * Copyright(C) 2006, Hans J. Koch <hjk@hansjkoch.de> 8beafc54cSHans J. Koch * Copyright(C) 2006, Greg Kroah-Hartman <greg@kroah.com> 9beafc54cSHans J. Koch * 10beafc54cSHans J. Koch * Userspace IO 11beafc54cSHans J. Koch * 12beafc54cSHans J. Koch * Base Functions 13beafc54cSHans J. Koch */ 14beafc54cSHans J. Koch 15beafc54cSHans J. Koch #include <linux/module.h> 16beafc54cSHans J. Koch #include <linux/init.h> 17beafc54cSHans J. Koch #include <linux/poll.h> 18beafc54cSHans J. Koch #include <linux/device.h> 195a0e3ad6STejun Heo #include <linux/slab.h> 20beafc54cSHans J. Koch #include <linux/mm.h> 21beafc54cSHans J. Koch #include <linux/idr.h> 22174cd4b1SIngo Molnar #include <linux/sched/signal.h> 23beafc54cSHans J. Koch #include <linux/string.h> 24beafc54cSHans J. Koch #include <linux/kobject.h> 2591960a46SEric W. Biederman #include <linux/cdev.h> 26beafc54cSHans J. Koch #include <linux/uio_driver.h> 27beafc54cSHans J. Koch 2891960a46SEric W. Biederman #define UIO_MAX_DEVICES (1U << MINORBITS) 29beafc54cSHans J. Koch 30beafc54cSHans J. Koch static int uio_major; 3191960a46SEric W. Biederman static struct cdev *uio_cdev; 32beafc54cSHans J. Koch static DEFINE_IDR(uio_idr); 334f014691SJan Engelhardt static const struct file_operations uio_fops; 34beafc54cSHans J. Koch 350d4a7bc1SJonathan Corbet /* Protect idr accesses */ 360d4a7bc1SJonathan Corbet static DEFINE_MUTEX(minor_lock); 370d4a7bc1SJonathan Corbet 38beafc54cSHans J. Koch /* 39beafc54cSHans J. Koch * attributes 40beafc54cSHans J. Koch */ 41beafc54cSHans J. Koch 4281e7c6a6SGreg Kroah-Hartman struct uio_map { 4381e7c6a6SGreg Kroah-Hartman struct kobject kobj; 4481e7c6a6SGreg Kroah-Hartman struct uio_mem *mem; 45beafc54cSHans J. Koch }; 4681e7c6a6SGreg Kroah-Hartman #define to_map(map) container_of(map, struct uio_map, kobj) 47beafc54cSHans J. Koch 4882057791SHans J. Koch static ssize_t map_name_show(struct uio_mem *mem, char *buf) 4982057791SHans J. Koch { 5082057791SHans J. Koch if (unlikely(!mem->name)) 5182057791SHans J. Koch mem->name = ""; 5282057791SHans J. Koch 5382057791SHans J. Koch return sprintf(buf, "%s\n", mem->name); 5482057791SHans J. Koch } 5582057791SHans J. Koch 564f808bcdSBrandon Philips static ssize_t map_addr_show(struct uio_mem *mem, char *buf) 57beafc54cSHans J. Koch { 58e0f1147cSCristian Stoica return sprintf(buf, "%pa\n", &mem->addr); 59beafc54cSHans J. Koch } 60beafc54cSHans J. Koch 614f808bcdSBrandon Philips static ssize_t map_size_show(struct uio_mem *mem, char *buf) 624f808bcdSBrandon Philips { 63e0f1147cSCristian Stoica return sprintf(buf, "%pa\n", &mem->size); 644f808bcdSBrandon Philips } 654f808bcdSBrandon Philips 66e2b39df1SHans J. Koch static ssize_t map_offset_show(struct uio_mem *mem, char *buf) 67e2b39df1SHans J. Koch { 68171058fbSMichal Sojka return sprintf(buf, "0x%llx\n", (unsigned long long)mem->offs); 69e2b39df1SHans J. Koch } 70e2b39df1SHans J. Koch 71e70c412eSHans J. Koch struct map_sysfs_entry { 724f808bcdSBrandon Philips struct attribute attr; 734f808bcdSBrandon Philips ssize_t (*show)(struct uio_mem *, char *); 744f808bcdSBrandon Philips ssize_t (*store)(struct uio_mem *, const char *, size_t); 754f808bcdSBrandon Philips }; 764f808bcdSBrandon Philips 7782057791SHans J. Koch static struct map_sysfs_entry name_attribute = 7882057791SHans J. Koch __ATTR(name, S_IRUGO, map_name_show, NULL); 79e70c412eSHans J. Koch static struct map_sysfs_entry addr_attribute = 804f808bcdSBrandon Philips __ATTR(addr, S_IRUGO, map_addr_show, NULL); 81e70c412eSHans J. Koch static struct map_sysfs_entry size_attribute = 824f808bcdSBrandon Philips __ATTR(size, S_IRUGO, map_size_show, NULL); 83e70c412eSHans J. Koch static struct map_sysfs_entry offset_attribute = 84e2b39df1SHans J. Koch __ATTR(offset, S_IRUGO, map_offset_show, NULL); 85beafc54cSHans J. Koch 8681e7c6a6SGreg Kroah-Hartman static struct attribute *attrs[] = { 8782057791SHans J. Koch &name_attribute.attr, 884f808bcdSBrandon Philips &addr_attribute.attr, 8981e7c6a6SGreg Kroah-Hartman &size_attribute.attr, 90e2b39df1SHans J. Koch &offset_attribute.attr, 9181e7c6a6SGreg Kroah-Hartman NULL, /* need to NULL terminate the list of attributes */ 92beafc54cSHans J. Koch }; 93beafc54cSHans J. Koch 9481e7c6a6SGreg Kroah-Hartman static void map_release(struct kobject *kobj) 9581e7c6a6SGreg Kroah-Hartman { 9681e7c6a6SGreg Kroah-Hartman struct uio_map *map = to_map(kobj); 9781e7c6a6SGreg Kroah-Hartman kfree(map); 9881e7c6a6SGreg Kroah-Hartman } 9981e7c6a6SGreg Kroah-Hartman 1004f808bcdSBrandon Philips static ssize_t map_type_show(struct kobject *kobj, struct attribute *attr, 1014f808bcdSBrandon Philips char *buf) 1024f808bcdSBrandon Philips { 1034f808bcdSBrandon Philips struct uio_map *map = to_map(kobj); 1044f808bcdSBrandon Philips struct uio_mem *mem = map->mem; 105e70c412eSHans J. Koch struct map_sysfs_entry *entry; 1064f808bcdSBrandon Philips 107e70c412eSHans J. Koch entry = container_of(attr, struct map_sysfs_entry, attr); 1084f808bcdSBrandon Philips 1094f808bcdSBrandon Philips if (!entry->show) 1104f808bcdSBrandon Philips return -EIO; 1114f808bcdSBrandon Philips 1124f808bcdSBrandon Philips return entry->show(mem, buf); 1134f808bcdSBrandon Philips } 1144f808bcdSBrandon Philips 11552cf25d0SEmese Revfy static const struct sysfs_ops map_sysfs_ops = { 1164f808bcdSBrandon Philips .show = map_type_show, 1174f808bcdSBrandon Philips }; 1184f808bcdSBrandon Philips 119beafc54cSHans J. Koch static struct kobj_type map_attr_type = { 12081e7c6a6SGreg Kroah-Hartman .release = map_release, 121e70c412eSHans J. Koch .sysfs_ops = &map_sysfs_ops, 12281e7c6a6SGreg Kroah-Hartman .default_attrs = attrs, 123beafc54cSHans J. Koch }; 124beafc54cSHans J. Koch 125e70c412eSHans J. Koch struct uio_portio { 126e70c412eSHans J. Koch struct kobject kobj; 127e70c412eSHans J. Koch struct uio_port *port; 128e70c412eSHans J. Koch }; 129e70c412eSHans J. Koch #define to_portio(portio) container_of(portio, struct uio_portio, kobj) 130e70c412eSHans J. Koch 13182057791SHans J. Koch static ssize_t portio_name_show(struct uio_port *port, char *buf) 13282057791SHans J. Koch { 13382057791SHans J. Koch if (unlikely(!port->name)) 13482057791SHans J. Koch port->name = ""; 13582057791SHans J. Koch 13682057791SHans J. Koch return sprintf(buf, "%s\n", port->name); 13782057791SHans J. Koch } 13882057791SHans J. Koch 139e70c412eSHans J. Koch static ssize_t portio_start_show(struct uio_port *port, char *buf) 140e70c412eSHans J. Koch { 141e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->start); 142e70c412eSHans J. Koch } 143e70c412eSHans J. Koch 144e70c412eSHans J. Koch static ssize_t portio_size_show(struct uio_port *port, char *buf) 145e70c412eSHans J. Koch { 146e70c412eSHans J. Koch return sprintf(buf, "0x%lx\n", port->size); 147e70c412eSHans J. Koch } 148e70c412eSHans J. Koch 149e70c412eSHans J. Koch static ssize_t portio_porttype_show(struct uio_port *port, char *buf) 150e70c412eSHans J. Koch { 151e70c412eSHans J. Koch const char *porttypes[] = {"none", "x86", "gpio", "other"}; 152e70c412eSHans J. Koch 153e70c412eSHans J. Koch if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER)) 154e70c412eSHans J. Koch return -EINVAL; 155e70c412eSHans J. Koch 156e70c412eSHans J. Koch return sprintf(buf, "port_%s\n", porttypes[port->porttype]); 157e70c412eSHans J. Koch } 158e70c412eSHans J. Koch 159e70c412eSHans J. Koch struct portio_sysfs_entry { 160e70c412eSHans J. Koch struct attribute attr; 161e70c412eSHans J. Koch ssize_t (*show)(struct uio_port *, char *); 162e70c412eSHans J. Koch ssize_t (*store)(struct uio_port *, const char *, size_t); 163e70c412eSHans J. Koch }; 164e70c412eSHans J. Koch 16582057791SHans J. Koch static struct portio_sysfs_entry portio_name_attribute = 16682057791SHans J. Koch __ATTR(name, S_IRUGO, portio_name_show, NULL); 167e70c412eSHans J. Koch static struct portio_sysfs_entry portio_start_attribute = 168e70c412eSHans J. Koch __ATTR(start, S_IRUGO, portio_start_show, NULL); 169e70c412eSHans J. Koch static struct portio_sysfs_entry portio_size_attribute = 170e70c412eSHans J. Koch __ATTR(size, S_IRUGO, portio_size_show, NULL); 171e70c412eSHans J. Koch static struct portio_sysfs_entry portio_porttype_attribute = 172e70c412eSHans J. Koch __ATTR(porttype, S_IRUGO, portio_porttype_show, NULL); 173e70c412eSHans J. Koch 174e70c412eSHans J. Koch static struct attribute *portio_attrs[] = { 17582057791SHans J. Koch &portio_name_attribute.attr, 176e70c412eSHans J. Koch &portio_start_attribute.attr, 177e70c412eSHans J. Koch &portio_size_attribute.attr, 178e70c412eSHans J. Koch &portio_porttype_attribute.attr, 179e70c412eSHans J. Koch NULL, 180e70c412eSHans J. Koch }; 181e70c412eSHans J. Koch 182e70c412eSHans J. Koch static void portio_release(struct kobject *kobj) 183e70c412eSHans J. Koch { 184e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 185e70c412eSHans J. Koch kfree(portio); 186e70c412eSHans J. Koch } 187e70c412eSHans J. Koch 188e70c412eSHans J. Koch static ssize_t portio_type_show(struct kobject *kobj, struct attribute *attr, 189e70c412eSHans J. Koch char *buf) 190e70c412eSHans J. Koch { 191e70c412eSHans J. Koch struct uio_portio *portio = to_portio(kobj); 192e70c412eSHans J. Koch struct uio_port *port = portio->port; 193e70c412eSHans J. Koch struct portio_sysfs_entry *entry; 194e70c412eSHans J. Koch 195e70c412eSHans J. Koch entry = container_of(attr, struct portio_sysfs_entry, attr); 196e70c412eSHans J. Koch 197e70c412eSHans J. Koch if (!entry->show) 198e70c412eSHans J. Koch return -EIO; 199e70c412eSHans J. Koch 200e70c412eSHans J. Koch return entry->show(port, buf); 201e70c412eSHans J. Koch } 202e70c412eSHans J. Koch 20352cf25d0SEmese Revfy static const struct sysfs_ops portio_sysfs_ops = { 204e70c412eSHans J. Koch .show = portio_type_show, 205e70c412eSHans J. Koch }; 206e70c412eSHans J. Koch 207e70c412eSHans J. Koch static struct kobj_type portio_attr_type = { 208e70c412eSHans J. Koch .release = portio_release, 209e70c412eSHans J. Koch .sysfs_ops = &portio_sysfs_ops, 210e70c412eSHans J. Koch .default_attrs = portio_attrs, 211e70c412eSHans J. Koch }; 212e70c412eSHans J. Koch 213c9dce927SGreg Kroah-Hartman static ssize_t name_show(struct device *dev, 214beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 215beafc54cSHans J. Koch { 216beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 21757c5f4dfSXiubo Li int ret; 21857c5f4dfSXiubo Li 21957c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 22057c5f4dfSXiubo Li if (!idev->info) { 22157c5f4dfSXiubo Li ret = -EINVAL; 22257c5f4dfSXiubo Li dev_err(dev, "the device has been unregistered\n"); 22357c5f4dfSXiubo Li goto out; 22457c5f4dfSXiubo Li } 22557c5f4dfSXiubo Li 22657c5f4dfSXiubo Li ret = sprintf(buf, "%s\n", idev->info->name); 22757c5f4dfSXiubo Li 22857c5f4dfSXiubo Li out: 22957c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 23057c5f4dfSXiubo Li return ret; 231beafc54cSHans J. Koch } 232c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(name); 233beafc54cSHans J. Koch 234c9dce927SGreg Kroah-Hartman static ssize_t version_show(struct device *dev, 235beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 236beafc54cSHans J. Koch { 237beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 23857c5f4dfSXiubo Li int ret; 23957c5f4dfSXiubo Li 24057c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 24157c5f4dfSXiubo Li if (!idev->info) { 24257c5f4dfSXiubo Li ret = -EINVAL; 24357c5f4dfSXiubo Li dev_err(dev, "the device has been unregistered\n"); 24457c5f4dfSXiubo Li goto out; 24557c5f4dfSXiubo Li } 24657c5f4dfSXiubo Li 24757c5f4dfSXiubo Li ret = sprintf(buf, "%s\n", idev->info->version); 24857c5f4dfSXiubo Li 24957c5f4dfSXiubo Li out: 25057c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 25157c5f4dfSXiubo Li return ret; 252beafc54cSHans J. Koch } 253c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(version); 254beafc54cSHans J. Koch 255c9dce927SGreg Kroah-Hartman static ssize_t event_show(struct device *dev, 256beafc54cSHans J. Koch struct device_attribute *attr, char *buf) 257beafc54cSHans J. Koch { 258beafc54cSHans J. Koch struct uio_device *idev = dev_get_drvdata(dev); 25970a9156bSEric W. Biederman return sprintf(buf, "%u\n", (unsigned int)atomic_read(&idev->event)); 260beafc54cSHans J. Koch } 261c9dce927SGreg Kroah-Hartman static DEVICE_ATTR_RO(event); 262beafc54cSHans J. Koch 263c9dce927SGreg Kroah-Hartman static struct attribute *uio_attrs[] = { 264c9dce927SGreg Kroah-Hartman &dev_attr_name.attr, 265c9dce927SGreg Kroah-Hartman &dev_attr_version.attr, 266c9dce927SGreg Kroah-Hartman &dev_attr_event.attr, 267c9dce927SGreg Kroah-Hartman NULL, 268beafc54cSHans J. Koch }; 269c9dce927SGreg Kroah-Hartman ATTRIBUTE_GROUPS(uio); 270beafc54cSHans J. Koch 271c66fdab6SEric W. Biederman /* UIO class infrastructure */ 272c66fdab6SEric W. Biederman static struct class uio_class = { 273c66fdab6SEric W. Biederman .name = "uio", 274c9dce927SGreg Kroah-Hartman .dev_groups = uio_groups, 275beafc54cSHans J. Koch }; 276beafc54cSHans J. Koch 2776011002cSWei Yongjun static bool uio_class_registered; 278ae61cf5bSAlexandre Belloni 279beafc54cSHans J. Koch /* 280beafc54cSHans J. Koch * device functions 281beafc54cSHans J. Koch */ 282beafc54cSHans J. Koch static int uio_dev_add_attributes(struct uio_device *idev) 283beafc54cSHans J. Koch { 284beafc54cSHans J. Koch int ret; 285e70c412eSHans J. Koch int mi, pi; 286beafc54cSHans J. Koch int map_found = 0; 287e70c412eSHans J. Koch int portio_found = 0; 288beafc54cSHans J. Koch struct uio_mem *mem; 28981e7c6a6SGreg Kroah-Hartman struct uio_map *map; 290e70c412eSHans J. Koch struct uio_port *port; 291e70c412eSHans J. Koch struct uio_portio *portio; 292beafc54cSHans J. Koch 293beafc54cSHans J. Koch for (mi = 0; mi < MAX_UIO_MAPS; mi++) { 294beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 295beafc54cSHans J. Koch if (mem->size == 0) 296beafc54cSHans J. Koch break; 297beafc54cSHans J. Koch if (!map_found) { 298beafc54cSHans J. Koch map_found = 1; 29981e7c6a6SGreg Kroah-Hartman idev->map_dir = kobject_create_and_add("maps", 300a93e7b33SHamish Martin &idev->dev.kobj); 3010320a278SDan Carpenter if (!idev->map_dir) { 3020320a278SDan Carpenter ret = -ENOMEM; 303e70c412eSHans J. Koch goto err_map; 304beafc54cSHans J. Koch } 3050320a278SDan Carpenter } 30681e7c6a6SGreg Kroah-Hartman map = kzalloc(sizeof(*map), GFP_KERNEL); 3070320a278SDan Carpenter if (!map) { 3080320a278SDan Carpenter ret = -ENOMEM; 3090d835390SSuman Anna goto err_map; 3100320a278SDan Carpenter } 311f9cb074bSGreg Kroah-Hartman kobject_init(&map->kobj, &map_attr_type); 31281e7c6a6SGreg Kroah-Hartman map->mem = mem; 31381e7c6a6SGreg Kroah-Hartman mem->map = map; 314b2d6db58SGreg Kroah-Hartman ret = kobject_add(&map->kobj, idev->map_dir, "map%d", mi); 315beafc54cSHans J. Koch if (ret) 31675f0aef6SCong Ding goto err_map_kobj; 31781e7c6a6SGreg Kroah-Hartman ret = kobject_uevent(&map->kobj, KOBJ_ADD); 31881e7c6a6SGreg Kroah-Hartman if (ret) 3190d835390SSuman Anna goto err_map_kobj; 320e70c412eSHans J. Koch } 321e70c412eSHans J. Koch 322e70c412eSHans J. Koch for (pi = 0; pi < MAX_UIO_PORT_REGIONS; pi++) { 323e70c412eSHans J. Koch port = &idev->info->port[pi]; 324e70c412eSHans J. Koch if (port->size == 0) 325e70c412eSHans J. Koch break; 326e70c412eSHans J. Koch if (!portio_found) { 327e70c412eSHans J. Koch portio_found = 1; 328e70c412eSHans J. Koch idev->portio_dir = kobject_create_and_add("portio", 329a93e7b33SHamish Martin &idev->dev.kobj); 3300320a278SDan Carpenter if (!idev->portio_dir) { 3310320a278SDan Carpenter ret = -ENOMEM; 332e70c412eSHans J. Koch goto err_portio; 333e70c412eSHans J. Koch } 3340320a278SDan Carpenter } 335e70c412eSHans J. Koch portio = kzalloc(sizeof(*portio), GFP_KERNEL); 3360320a278SDan Carpenter if (!portio) { 3370320a278SDan Carpenter ret = -ENOMEM; 3380d835390SSuman Anna goto err_portio; 3390320a278SDan Carpenter } 340e70c412eSHans J. Koch kobject_init(&portio->kobj, &portio_attr_type); 341e70c412eSHans J. Koch portio->port = port; 342e70c412eSHans J. Koch port->portio = portio; 343e70c412eSHans J. Koch ret = kobject_add(&portio->kobj, idev->portio_dir, 344e70c412eSHans J. Koch "port%d", pi); 345e70c412eSHans J. Koch if (ret) 34675f0aef6SCong Ding goto err_portio_kobj; 347e70c412eSHans J. Koch ret = kobject_uevent(&portio->kobj, KOBJ_ADD); 348e70c412eSHans J. Koch if (ret) 3490d835390SSuman Anna goto err_portio_kobj; 350beafc54cSHans J. Koch } 351beafc54cSHans J. Koch 352beafc54cSHans J. Koch return 0; 353beafc54cSHans J. Koch 354e70c412eSHans J. Koch err_portio: 35575f0aef6SCong Ding pi--; 35675f0aef6SCong Ding err_portio_kobj: 35775f0aef6SCong Ding for (; pi >= 0; pi--) { 358e70c412eSHans J. Koch port = &idev->info->port[pi]; 359e70c412eSHans J. Koch portio = port->portio; 360e70c412eSHans J. Koch kobject_put(&portio->kobj); 361e70c412eSHans J. Koch } 362e70c412eSHans J. Koch kobject_put(idev->portio_dir); 363e70c412eSHans J. Koch err_map: 36475f0aef6SCong Ding mi--; 36575f0aef6SCong Ding err_map_kobj: 36675f0aef6SCong Ding for (; mi >= 0; mi--) { 367beafc54cSHans J. Koch mem = &idev->info->mem[mi]; 36881e7c6a6SGreg Kroah-Hartman map = mem->map; 369c10997f6SGreg Kroah-Hartman kobject_put(&map->kobj); 370beafc54cSHans J. Koch } 371c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 372a93e7b33SHamish Martin dev_err(&idev->dev, "error creating sysfs files (%d)\n", ret); 373beafc54cSHans J. Koch return ret; 374beafc54cSHans J. Koch } 375beafc54cSHans J. Koch 376beafc54cSHans J. Koch static void uio_dev_del_attributes(struct uio_device *idev) 377beafc54cSHans J. Koch { 378e70c412eSHans J. Koch int i; 379beafc54cSHans J. Koch struct uio_mem *mem; 380e70c412eSHans J. Koch struct uio_port *port; 381e70c412eSHans J. Koch 382e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_MAPS; i++) { 383e70c412eSHans J. Koch mem = &idev->info->mem[i]; 384beafc54cSHans J. Koch if (mem->size == 0) 385beafc54cSHans J. Koch break; 386c10997f6SGreg Kroah-Hartman kobject_put(&mem->map->kobj); 387beafc54cSHans J. Koch } 388c10997f6SGreg Kroah-Hartman kobject_put(idev->map_dir); 389e70c412eSHans J. Koch 390e70c412eSHans J. Koch for (i = 0; i < MAX_UIO_PORT_REGIONS; i++) { 391e70c412eSHans J. Koch port = &idev->info->port[i]; 392e70c412eSHans J. Koch if (port->size == 0) 393e70c412eSHans J. Koch break; 394e70c412eSHans J. Koch kobject_put(&port->portio->kobj); 395e70c412eSHans J. Koch } 396e70c412eSHans J. Koch kobject_put(idev->portio_dir); 397beafc54cSHans J. Koch } 398beafc54cSHans J. Koch 399beafc54cSHans J. Koch static int uio_get_minor(struct uio_device *idev) 400beafc54cSHans J. Koch { 401beafc54cSHans J. Koch int retval = -ENOMEM; 402beafc54cSHans J. Koch 403beafc54cSHans J. Koch mutex_lock(&minor_lock); 4046d770931STejun Heo retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL); 4056d770931STejun Heo if (retval >= 0) { 4066d770931STejun Heo idev->minor = retval; 4075ed0505cSDamian Hobson-Garcia retval = 0; 4086d770931STejun Heo } else if (retval == -ENOSPC) { 409a93e7b33SHamish Martin dev_err(&idev->dev, "too many uio devices\n"); 410c6edc42fSHillf Danton retval = -EINVAL; 411c6edc42fSHillf Danton } 412beafc54cSHans J. Koch mutex_unlock(&minor_lock); 413beafc54cSHans J. Koch return retval; 414beafc54cSHans J. Koch } 415beafc54cSHans J. Koch 416beafc54cSHans J. Koch static void uio_free_minor(struct uio_device *idev) 417beafc54cSHans J. Koch { 4180d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 419beafc54cSHans J. Koch idr_remove(&uio_idr, idev->minor); 4200d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 421beafc54cSHans J. Koch } 422beafc54cSHans J. Koch 423beafc54cSHans J. Koch /** 424beafc54cSHans J. Koch * uio_event_notify - trigger an interrupt event 425beafc54cSHans J. Koch * @info: UIO device capabilities 426beafc54cSHans J. Koch */ 427beafc54cSHans J. Koch void uio_event_notify(struct uio_info *info) 428beafc54cSHans J. Koch { 429beafc54cSHans J. Koch struct uio_device *idev = info->uio_dev; 430beafc54cSHans J. Koch 431beafc54cSHans J. Koch atomic_inc(&idev->event); 432beafc54cSHans J. Koch wake_up_interruptible(&idev->wait); 433beafc54cSHans J. Koch kill_fasync(&idev->async_queue, SIGIO, POLL_IN); 434beafc54cSHans J. Koch } 435beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_event_notify); 436beafc54cSHans J. Koch 437beafc54cSHans J. Koch /** 438beafc54cSHans J. Koch * uio_interrupt - hardware interrupt handler 439beafc54cSHans J. Koch * @irq: IRQ number, can be UIO_IRQ_CYCLIC for cyclic timer 440beafc54cSHans J. Koch * @dev_id: Pointer to the devices uio_device structure 441beafc54cSHans J. Koch */ 442beafc54cSHans J. Koch static irqreturn_t uio_interrupt(int irq, void *dev_id) 443beafc54cSHans J. Koch { 444beafc54cSHans J. Koch struct uio_device *idev = (struct uio_device *)dev_id; 44557c5f4dfSXiubo Li irqreturn_t ret; 446beafc54cSHans J. Koch 44757c5f4dfSXiubo Li ret = idev->info->handler(irq, idev->info); 448beafc54cSHans J. Koch if (ret == IRQ_HANDLED) 449beafc54cSHans J. Koch uio_event_notify(idev->info); 450beafc54cSHans J. Koch 451beafc54cSHans J. Koch return ret; 452beafc54cSHans J. Koch } 453beafc54cSHans J. Koch 454beafc54cSHans J. Koch struct uio_listener { 455beafc54cSHans J. Koch struct uio_device *dev; 456beafc54cSHans J. Koch s32 event_count; 457beafc54cSHans J. Koch }; 458beafc54cSHans J. Koch 459beafc54cSHans J. Koch static int uio_open(struct inode *inode, struct file *filep) 460beafc54cSHans J. Koch { 461beafc54cSHans J. Koch struct uio_device *idev; 462beafc54cSHans J. Koch struct uio_listener *listener; 463beafc54cSHans J. Koch int ret = 0; 464beafc54cSHans J. Koch 4650d4a7bc1SJonathan Corbet mutex_lock(&minor_lock); 466beafc54cSHans J. Koch idev = idr_find(&uio_idr, iminor(inode)); 4670d4a7bc1SJonathan Corbet mutex_unlock(&minor_lock); 468fbc8a81dSJonathan Corbet if (!idev) { 469fbc8a81dSJonathan Corbet ret = -ENODEV; 470fbc8a81dSJonathan Corbet goto out; 471fbc8a81dSJonathan Corbet } 472beafc54cSHans J. Koch 473a93e7b33SHamish Martin get_device(&idev->dev); 474a93e7b33SHamish Martin 475fbc8a81dSJonathan Corbet if (!try_module_get(idev->owner)) { 476fbc8a81dSJonathan Corbet ret = -ENODEV; 477a93e7b33SHamish Martin goto err_module_get; 478fbc8a81dSJonathan Corbet } 479610ad506SUwe Kleine-König 480beafc54cSHans J. Koch listener = kmalloc(sizeof(*listener), GFP_KERNEL); 481610ad506SUwe Kleine-König if (!listener) { 482610ad506SUwe Kleine-König ret = -ENOMEM; 483610ad506SUwe Kleine-König goto err_alloc_listener; 484610ad506SUwe Kleine-König } 485beafc54cSHans J. Koch 486beafc54cSHans J. Koch listener->dev = idev; 487beafc54cSHans J. Koch listener->event_count = atomic_read(&idev->event); 488beafc54cSHans J. Koch filep->private_data = listener; 489beafc54cSHans J. Koch 490543af586SXiubo Li mutex_lock(&idev->info_lock); 49157c5f4dfSXiubo Li if (!idev->info) { 49257c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 49357c5f4dfSXiubo Li ret = -EINVAL; 4941e09cdd5SChengguang Xu goto err_infoopen; 49557c5f4dfSXiubo Li } 49657c5f4dfSXiubo Li 49754557665SChengguang Xu if (idev->info->open) 498beafc54cSHans J. Koch ret = idev->info->open(idev->info, inode); 499543af586SXiubo Li mutex_unlock(&idev->info_lock); 500610ad506SUwe Kleine-König if (ret) 501610ad506SUwe Kleine-König goto err_infoopen; 502a93e7b33SHamish Martin 503610ad506SUwe Kleine-König return 0; 504610ad506SUwe Kleine-König 505610ad506SUwe Kleine-König err_infoopen: 506beafc54cSHans J. Koch kfree(listener); 507610ad506SUwe Kleine-König 5080d4a7bc1SJonathan Corbet err_alloc_listener: 509610ad506SUwe Kleine-König module_put(idev->owner); 510beafc54cSHans J. Koch 511a93e7b33SHamish Martin err_module_get: 512a93e7b33SHamish Martin put_device(&idev->dev); 513a93e7b33SHamish Martin 514fbc8a81dSJonathan Corbet out: 515beafc54cSHans J. Koch return ret; 516beafc54cSHans J. Koch } 517beafc54cSHans J. Koch 518beafc54cSHans J. Koch static int uio_fasync(int fd, struct file *filep, int on) 519beafc54cSHans J. Koch { 520beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 521beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 522beafc54cSHans J. Koch 523beafc54cSHans J. Koch return fasync_helper(fd, filep, on, &idev->async_queue); 524beafc54cSHans J. Koch } 525beafc54cSHans J. Koch 526beafc54cSHans J. Koch static int uio_release(struct inode *inode, struct file *filep) 527beafc54cSHans J. Koch { 528beafc54cSHans J. Koch int ret = 0; 529beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 530beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 531beafc54cSHans J. Koch 532543af586SXiubo Li mutex_lock(&idev->info_lock); 533a93e7b33SHamish Martin if (idev->info && idev->info->release) 534beafc54cSHans J. Koch ret = idev->info->release(idev->info, inode); 535543af586SXiubo Li mutex_unlock(&idev->info_lock); 536610ad506SUwe Kleine-König 537beafc54cSHans J. Koch module_put(idev->owner); 538beafc54cSHans J. Koch kfree(listener); 539a93e7b33SHamish Martin put_device(&idev->dev); 540beafc54cSHans J. Koch return ret; 541beafc54cSHans J. Koch } 542beafc54cSHans J. Koch 543afc9a42bSAl Viro static __poll_t uio_poll(struct file *filep, poll_table *wait) 544beafc54cSHans J. Koch { 545beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 546beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 547a93e7b33SHamish Martin __poll_t ret = 0; 548beafc54cSHans J. Koch 549543af586SXiubo Li mutex_lock(&idev->info_lock); 550a93e7b33SHamish Martin if (!idev->info || !idev->info->irq) 551a93e7b33SHamish Martin ret = -EIO; 552543af586SXiubo Li mutex_unlock(&idev->info_lock); 553a93e7b33SHamish Martin 554a93e7b33SHamish Martin if (ret) 555a93e7b33SHamish Martin return ret; 556beafc54cSHans J. Koch 557beafc54cSHans J. Koch poll_wait(filep, &idev->wait, wait); 558beafc54cSHans J. Koch if (listener->event_count != atomic_read(&idev->event)) 559a9a08845SLinus Torvalds return EPOLLIN | EPOLLRDNORM; 560beafc54cSHans J. Koch return 0; 561beafc54cSHans J. Koch } 562beafc54cSHans J. Koch 563beafc54cSHans J. Koch static ssize_t uio_read(struct file *filep, char __user *buf, 564beafc54cSHans J. Koch size_t count, loff_t *ppos) 565beafc54cSHans J. Koch { 566beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 567beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 568beafc54cSHans J. Koch DECLARE_WAITQUEUE(wait, current); 569a93e7b33SHamish Martin ssize_t retval = 0; 570beafc54cSHans J. Koch s32 event_count; 571beafc54cSHans J. Koch 572beafc54cSHans J. Koch if (count != sizeof(s32)) 573beafc54cSHans J. Koch return -EINVAL; 574beafc54cSHans J. Koch 575beafc54cSHans J. Koch add_wait_queue(&idev->wait, &wait); 576beafc54cSHans J. Koch 577beafc54cSHans J. Koch do { 578b5570ca7SZhaolong Zhang mutex_lock(&idev->info_lock); 579b5570ca7SZhaolong Zhang if (!idev->info || !idev->info->irq) { 580b5570ca7SZhaolong Zhang retval = -EIO; 581b5570ca7SZhaolong Zhang mutex_unlock(&idev->info_lock); 582b5570ca7SZhaolong Zhang break; 583b5570ca7SZhaolong Zhang } 584b5570ca7SZhaolong Zhang mutex_unlock(&idev->info_lock); 585b5570ca7SZhaolong Zhang 586beafc54cSHans J. Koch set_current_state(TASK_INTERRUPTIBLE); 587beafc54cSHans J. Koch 588beafc54cSHans J. Koch event_count = atomic_read(&idev->event); 589beafc54cSHans J. Koch if (event_count != listener->event_count) { 590edce5e6fSMichal Hocko __set_current_state(TASK_RUNNING); 591beafc54cSHans J. Koch if (copy_to_user(buf, &event_count, count)) 592beafc54cSHans J. Koch retval = -EFAULT; 593beafc54cSHans J. Koch else { 594beafc54cSHans J. Koch listener->event_count = event_count; 595beafc54cSHans J. Koch retval = count; 596beafc54cSHans J. Koch } 597beafc54cSHans J. Koch break; 598beafc54cSHans J. Koch } 599beafc54cSHans J. Koch 600beafc54cSHans J. Koch if (filep->f_flags & O_NONBLOCK) { 601beafc54cSHans J. Koch retval = -EAGAIN; 602beafc54cSHans J. Koch break; 603beafc54cSHans J. Koch } 604beafc54cSHans J. Koch 605beafc54cSHans J. Koch if (signal_pending(current)) { 606beafc54cSHans J. Koch retval = -ERESTARTSYS; 607beafc54cSHans J. Koch break; 608beafc54cSHans J. Koch } 609beafc54cSHans J. Koch schedule(); 610beafc54cSHans J. Koch } while (1); 611beafc54cSHans J. Koch 612beafc54cSHans J. Koch __set_current_state(TASK_RUNNING); 613beafc54cSHans J. Koch remove_wait_queue(&idev->wait, &wait); 614beafc54cSHans J. Koch 615beafc54cSHans J. Koch return retval; 616beafc54cSHans J. Koch } 617beafc54cSHans J. Koch 618328a14e7SHans J. Koch static ssize_t uio_write(struct file *filep, const char __user *buf, 619328a14e7SHans J. Koch size_t count, loff_t *ppos) 620328a14e7SHans J. Koch { 621328a14e7SHans J. Koch struct uio_listener *listener = filep->private_data; 622328a14e7SHans J. Koch struct uio_device *idev = listener->dev; 623328a14e7SHans J. Koch ssize_t retval; 624328a14e7SHans J. Koch s32 irq_on; 625328a14e7SHans J. Koch 626b34e9a15SXiubo Li if (count != sizeof(s32)) 627b34e9a15SXiubo Li return -EINVAL; 628b34e9a15SXiubo Li 629b34e9a15SXiubo Li if (copy_from_user(&irq_on, buf, count)) 630b34e9a15SXiubo Li return -EFAULT; 631b34e9a15SXiubo Li 632543af586SXiubo Li mutex_lock(&idev->info_lock); 63357c5f4dfSXiubo Li if (!idev->info) { 63457c5f4dfSXiubo Li retval = -EINVAL; 63557c5f4dfSXiubo Li goto out; 63657c5f4dfSXiubo Li } 63757c5f4dfSXiubo Li 63854557665SChengguang Xu if (!idev->info->irq) { 63981daa406SHamish Martin retval = -EIO; 64081daa406SHamish Martin goto out; 64181daa406SHamish Martin } 642328a14e7SHans J. Koch 64381daa406SHamish Martin if (!idev->info->irqcontrol) { 64481daa406SHamish Martin retval = -ENOSYS; 64581daa406SHamish Martin goto out; 64681daa406SHamish Martin } 647328a14e7SHans J. Koch 648328a14e7SHans J. Koch retval = idev->info->irqcontrol(idev->info, irq_on); 649328a14e7SHans J. Koch 65081daa406SHamish Martin out: 651543af586SXiubo Li mutex_unlock(&idev->info_lock); 652328a14e7SHans J. Koch return retval ? retval : sizeof(s32); 653328a14e7SHans J. Koch } 654328a14e7SHans J. Koch 655beafc54cSHans J. Koch static int uio_find_mem_index(struct vm_area_struct *vma) 656beafc54cSHans J. Koch { 657beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 658beafc54cSHans J. Koch 659f0c554fdSHillf Danton if (vma->vm_pgoff < MAX_UIO_MAPS) { 660f0c554fdSHillf Danton if (idev->info->mem[vma->vm_pgoff].size == 0) 661beafc54cSHans J. Koch return -1; 662f0c554fdSHillf Danton return (int)vma->vm_pgoff; 663beafc54cSHans J. Koch } 664beafc54cSHans J. Koch return -1; 665beafc54cSHans J. Koch } 666beafc54cSHans J. Koch 6679b85e95aSSouptick Joarder static vm_fault_t uio_vma_fault(struct vm_fault *vmf) 668beafc54cSHans J. Koch { 66911bac800SDave Jiang struct uio_device *idev = vmf->vma->vm_private_data; 670a18b630dSNick Piggin struct page *page; 67102683ffdSAndrew G. Harvey unsigned long offset; 672e6418fccSBen Hutchings void *addr; 67379c6f4b8SSouptick Joarder vm_fault_t ret = 0; 67457c5f4dfSXiubo Li int mi; 675beafc54cSHans J. Koch 67657c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 67757c5f4dfSXiubo Li if (!idev->info) { 67857c5f4dfSXiubo Li ret = VM_FAULT_SIGBUS; 67957c5f4dfSXiubo Li goto out; 68057c5f4dfSXiubo Li } 68157c5f4dfSXiubo Li 68257c5f4dfSXiubo Li mi = uio_find_mem_index(vmf->vma); 68357c5f4dfSXiubo Li if (mi < 0) { 68457c5f4dfSXiubo Li ret = VM_FAULT_SIGBUS; 68557c5f4dfSXiubo Li goto out; 68657c5f4dfSXiubo Li } 687beafc54cSHans J. Koch 68802683ffdSAndrew G. Harvey /* 68902683ffdSAndrew G. Harvey * We need to subtract mi because userspace uses offset = N*PAGE_SIZE 69002683ffdSAndrew G. Harvey * to use mem[N]. 69102683ffdSAndrew G. Harvey */ 69202683ffdSAndrew G. Harvey offset = (vmf->pgoff - mi) << PAGE_SHIFT; 69302683ffdSAndrew G. Harvey 694e6418fccSBen Hutchings addr = (void *)(unsigned long)idev->info->mem[mi].addr + offset; 695beafc54cSHans J. Koch if (idev->info->mem[mi].memtype == UIO_MEM_LOGICAL) 696e6418fccSBen Hutchings page = virt_to_page(addr); 697beafc54cSHans J. Koch else 698e6418fccSBen Hutchings page = vmalloc_to_page(addr); 699beafc54cSHans J. Koch get_page(page); 700a18b630dSNick Piggin vmf->page = page; 70157c5f4dfSXiubo Li 70257c5f4dfSXiubo Li out: 70357c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 70457c5f4dfSXiubo Li 70557c5f4dfSXiubo Li return ret; 706beafc54cSHans J. Koch } 707beafc54cSHans J. Koch 7087294151dSUwe Kleine-König static const struct vm_operations_struct uio_logical_vm_ops = { 709a18b630dSNick Piggin .fault = uio_vma_fault, 710beafc54cSHans J. Koch }; 711beafc54cSHans J. Koch 7127294151dSUwe Kleine-König static int uio_mmap_logical(struct vm_area_struct *vma) 7137294151dSUwe Kleine-König { 7147294151dSUwe Kleine-König vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 7157294151dSUwe Kleine-König vma->vm_ops = &uio_logical_vm_ops; 7167294151dSUwe Kleine-König return 0; 7177294151dSUwe Kleine-König } 7187294151dSUwe Kleine-König 7197294151dSUwe Kleine-König static const struct vm_operations_struct uio_physical_vm_ops = { 7207294151dSUwe Kleine-König #ifdef CONFIG_HAVE_IOREMAP_PROT 7217294151dSUwe Kleine-König .access = generic_access_phys, 7227294151dSUwe Kleine-König #endif 7237294151dSUwe Kleine-König }; 7247294151dSUwe Kleine-König 725beafc54cSHans J. Koch static int uio_mmap_physical(struct vm_area_struct *vma) 726beafc54cSHans J. Koch { 727beafc54cSHans J. Koch struct uio_device *idev = vma->vm_private_data; 728beafc54cSHans J. Koch int mi = uio_find_mem_index(vma); 7297314e613SLinus Torvalds struct uio_mem *mem; 73057c5f4dfSXiubo Li 731beafc54cSHans J. Koch if (mi < 0) 732beafc54cSHans J. Koch return -EINVAL; 7337314e613SLinus Torvalds mem = idev->info->mem + mi; 7347314e613SLinus Torvalds 735b6550287SLinus Torvalds if (mem->addr & ~PAGE_MASK) 736b6550287SLinus Torvalds return -ENODEV; 737b29f680cSGreg Kroah-Hartman if (vma->vm_end - vma->vm_start > mem->size) 7387314e613SLinus Torvalds return -EINVAL; 739beafc54cSHans J. Koch 7407294151dSUwe Kleine-König vma->vm_ops = &uio_physical_vm_ops; 741bfddabfaSStephen Hemminger if (idev->info->mem[mi].memtype == UIO_MEM_PHYS) 742c9698d6bSJean-Samuel Chenard vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 743c9698d6bSJean-Samuel Chenard 7447314e613SLinus Torvalds /* 7457314e613SLinus Torvalds * We cannot use the vm_iomap_memory() helper here, 7467314e613SLinus Torvalds * because vma->vm_pgoff is the map index we looked 7477314e613SLinus Torvalds * up above in uio_find_mem_index(), rather than an 7487314e613SLinus Torvalds * actual page offset into the mmap. 7497314e613SLinus Torvalds * 7507314e613SLinus Torvalds * So we just do the physical mmap without a page 7517314e613SLinus Torvalds * offset. 7527314e613SLinus Torvalds */ 753beafc54cSHans J. Koch return remap_pfn_range(vma, 754beafc54cSHans J. Koch vma->vm_start, 7557314e613SLinus Torvalds mem->addr >> PAGE_SHIFT, 756beafc54cSHans J. Koch vma->vm_end - vma->vm_start, 757beafc54cSHans J. Koch vma->vm_page_prot); 758beafc54cSHans J. Koch } 759beafc54cSHans J. Koch 760beafc54cSHans J. Koch static int uio_mmap(struct file *filep, struct vm_area_struct *vma) 761beafc54cSHans J. Koch { 762beafc54cSHans J. Koch struct uio_listener *listener = filep->private_data; 763beafc54cSHans J. Koch struct uio_device *idev = listener->dev; 764beafc54cSHans J. Koch int mi; 765beafc54cSHans J. Koch unsigned long requested_pages, actual_pages; 766beafc54cSHans J. Koch int ret = 0; 767beafc54cSHans J. Koch 768beafc54cSHans J. Koch if (vma->vm_end < vma->vm_start) 769beafc54cSHans J. Koch return -EINVAL; 770beafc54cSHans J. Koch 771beafc54cSHans J. Koch vma->vm_private_data = idev; 772beafc54cSHans J. Koch 77357c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 77457c5f4dfSXiubo Li if (!idev->info) { 77557c5f4dfSXiubo Li ret = -EINVAL; 77657c5f4dfSXiubo Li goto out; 77757c5f4dfSXiubo Li } 77857c5f4dfSXiubo Li 779beafc54cSHans J. Koch mi = uio_find_mem_index(vma); 78057c5f4dfSXiubo Li if (mi < 0) { 78157c5f4dfSXiubo Li ret = -EINVAL; 78257c5f4dfSXiubo Li goto out; 78357c5f4dfSXiubo Li } 784beafc54cSHans J. Koch 78552c2dad9SLibin requested_pages = vma_pages(vma); 7866da2d377SIan Abbott actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK) 7876da2d377SIan Abbott + idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT; 78857c5f4dfSXiubo Li if (requested_pages > actual_pages) { 78957c5f4dfSXiubo Li ret = -EINVAL; 79057c5f4dfSXiubo Li goto out; 79157c5f4dfSXiubo Li } 792beafc54cSHans J. Koch 793beafc54cSHans J. Koch if (idev->info->mmap) { 794beafc54cSHans J. Koch ret = idev->info->mmap(idev->info, vma); 79557c5f4dfSXiubo Li goto out; 796beafc54cSHans J. Koch } 797beafc54cSHans J. Koch 798beafc54cSHans J. Koch switch (idev->info->mem[mi].memtype) { 799bfddabfaSStephen Hemminger case UIO_MEM_IOVA: 800beafc54cSHans J. Koch case UIO_MEM_PHYS: 80157c5f4dfSXiubo Li ret = uio_mmap_physical(vma); 80257c5f4dfSXiubo Li break; 803beafc54cSHans J. Koch case UIO_MEM_LOGICAL: 804beafc54cSHans J. Koch case UIO_MEM_VIRTUAL: 80557c5f4dfSXiubo Li ret = uio_mmap_logical(vma); 80657c5f4dfSXiubo Li break; 807beafc54cSHans J. Koch default: 80857c5f4dfSXiubo Li ret = -EINVAL; 809beafc54cSHans J. Koch } 81057c5f4dfSXiubo Li 81157c5f4dfSXiubo Li out: 81257c5f4dfSXiubo Li mutex_unlock(&idev->info_lock); 813e7de2590SHailong Liu return ret; 814beafc54cSHans J. Koch } 815beafc54cSHans J. Koch 8164f014691SJan Engelhardt static const struct file_operations uio_fops = { 817beafc54cSHans J. Koch .owner = THIS_MODULE, 818beafc54cSHans J. Koch .open = uio_open, 819beafc54cSHans J. Koch .release = uio_release, 820beafc54cSHans J. Koch .read = uio_read, 821328a14e7SHans J. Koch .write = uio_write, 822beafc54cSHans J. Koch .mmap = uio_mmap, 823beafc54cSHans J. Koch .poll = uio_poll, 824beafc54cSHans J. Koch .fasync = uio_fasync, 8256038f373SArnd Bergmann .llseek = noop_llseek, 826beafc54cSHans J. Koch }; 827beafc54cSHans J. Koch 828beafc54cSHans J. Koch static int uio_major_init(void) 829beafc54cSHans J. Koch { 83091960a46SEric W. Biederman static const char name[] = "uio"; 83191960a46SEric W. Biederman struct cdev *cdev = NULL; 83291960a46SEric W. Biederman dev_t uio_dev = 0; 83391960a46SEric W. Biederman int result; 83491960a46SEric W. Biederman 83591960a46SEric W. Biederman result = alloc_chrdev_region(&uio_dev, 0, UIO_MAX_DEVICES, name); 83691960a46SEric W. Biederman if (result) 83791960a46SEric W. Biederman goto out; 83891960a46SEric W. Biederman 83991960a46SEric W. Biederman result = -ENOMEM; 84091960a46SEric W. Biederman cdev = cdev_alloc(); 84191960a46SEric W. Biederman if (!cdev) 84291960a46SEric W. Biederman goto out_unregister; 84391960a46SEric W. Biederman 84491960a46SEric W. Biederman cdev->owner = THIS_MODULE; 84591960a46SEric W. Biederman cdev->ops = &uio_fops; 84691960a46SEric W. Biederman kobject_set_name(&cdev->kobj, "%s", name); 84791960a46SEric W. Biederman 84891960a46SEric W. Biederman result = cdev_add(cdev, uio_dev, UIO_MAX_DEVICES); 84991960a46SEric W. Biederman if (result) 85091960a46SEric W. Biederman goto out_put; 85191960a46SEric W. Biederman 85291960a46SEric W. Biederman uio_major = MAJOR(uio_dev); 85391960a46SEric W. Biederman uio_cdev = cdev; 854d80df1ceSWanlong Gao return 0; 85591960a46SEric W. Biederman out_put: 85691960a46SEric W. Biederman kobject_put(&cdev->kobj); 85791960a46SEric W. Biederman out_unregister: 85891960a46SEric W. Biederman unregister_chrdev_region(uio_dev, UIO_MAX_DEVICES); 859d80df1ceSWanlong Gao out: 860d80df1ceSWanlong Gao return result; 861beafc54cSHans J. Koch } 862beafc54cSHans J. Koch 863beafc54cSHans J. Koch static void uio_major_cleanup(void) 864beafc54cSHans J. Koch { 86591960a46SEric W. Biederman unregister_chrdev_region(MKDEV(uio_major, 0), UIO_MAX_DEVICES); 86691960a46SEric W. Biederman cdev_del(uio_cdev); 867beafc54cSHans J. Koch } 868beafc54cSHans J. Koch 869beafc54cSHans J. Koch static int init_uio_class(void) 870beafc54cSHans J. Koch { 8713d4f9d76SEric W. Biederman int ret; 872beafc54cSHans J. Koch 873beafc54cSHans J. Koch /* This is the first time in here, set everything up properly */ 874beafc54cSHans J. Koch ret = uio_major_init(); 875beafc54cSHans J. Koch if (ret) 876beafc54cSHans J. Koch goto exit; 877beafc54cSHans J. Koch 878c66fdab6SEric W. Biederman ret = class_register(&uio_class); 879c66fdab6SEric W. Biederman if (ret) { 880c66fdab6SEric W. Biederman printk(KERN_ERR "class_register failed for uio\n"); 881c66fdab6SEric W. Biederman goto err_class_register; 882beafc54cSHans J. Koch } 883ae61cf5bSAlexandre Belloni 884ae61cf5bSAlexandre Belloni uio_class_registered = true; 885ae61cf5bSAlexandre Belloni 886beafc54cSHans J. Koch return 0; 887beafc54cSHans J. Koch 888c66fdab6SEric W. Biederman err_class_register: 889beafc54cSHans J. Koch uio_major_cleanup(); 890beafc54cSHans J. Koch exit: 891beafc54cSHans J. Koch return ret; 892beafc54cSHans J. Koch } 893beafc54cSHans J. Koch 8943d4f9d76SEric W. Biederman static void release_uio_class(void) 895beafc54cSHans J. Koch { 896ae61cf5bSAlexandre Belloni uio_class_registered = false; 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 923ae61cf5bSAlexandre Belloni if (!uio_class_registered) 924ae61cf5bSAlexandre Belloni return -EPROBE_DEFER; 925ae61cf5bSAlexandre Belloni 926beafc54cSHans J. Koch if (!parent || !info || !info->name || !info->version) 927beafc54cSHans J. Koch return -EINVAL; 928beafc54cSHans J. Koch 929beafc54cSHans J. Koch info->uio_dev = NULL; 930beafc54cSHans J. Koch 931a93e7b33SHamish Martin idev = kzalloc(sizeof(*idev), GFP_KERNEL); 932beafc54cSHans J. Koch if (!idev) { 933e6789cd3SMichal Simek return -ENOMEM; 934beafc54cSHans J. Koch } 935beafc54cSHans J. Koch 936beafc54cSHans J. Koch idev->owner = owner; 937beafc54cSHans J. Koch idev->info = info; 938543af586SXiubo Li mutex_init(&idev->info_lock); 939beafc54cSHans J. Koch init_waitqueue_head(&idev->wait); 940beafc54cSHans J. Koch atomic_set(&idev->event, 0); 941beafc54cSHans J. Koch 942beafc54cSHans J. Koch ret = uio_get_minor(idev); 9431a392b3dSLiu Jian if (ret) { 9441a392b3dSLiu Jian kfree(idev); 945e6789cd3SMichal Simek return ret; 9461a392b3dSLiu Jian } 947beafc54cSHans J. Koch 948221a1f4aSLiu Jian device_initialize(&idev->dev); 949a93e7b33SHamish Martin idev->dev.devt = MKDEV(uio_major, idev->minor); 950a93e7b33SHamish Martin idev->dev.class = &uio_class; 951a93e7b33SHamish Martin idev->dev.parent = parent; 952a93e7b33SHamish Martin idev->dev.release = uio_device_release; 953a93e7b33SHamish Martin dev_set_drvdata(&idev->dev, idev); 954a93e7b33SHamish Martin 955a93e7b33SHamish Martin ret = dev_set_name(&idev->dev, "uio%d", idev->minor); 956a93e7b33SHamish Martin if (ret) 957beafc54cSHans J. Koch goto err_device_create; 958a93e7b33SHamish Martin 959221a1f4aSLiu Jian ret = device_add(&idev->dev); 960a93e7b33SHamish Martin if (ret) 961a93e7b33SHamish Martin goto err_device_create; 962beafc54cSHans J. Koch 963beafc54cSHans J. Koch ret = uio_dev_add_attributes(idev); 964beafc54cSHans J. Koch if (ret) 965beafc54cSHans J. Koch goto err_uio_dev_add_attributes; 966beafc54cSHans J. Koch 96743279819SDan Carpenter info->uio_dev = idev; 96843279819SDan Carpenter 9696427a765SEric W. Biederman if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) { 970a087146cSBrian Russell /* 971a087146cSBrian Russell * Note that we deliberately don't use devm_request_irq 972a087146cSBrian Russell * here. The parent module can unregister the UIO device 973a087146cSBrian Russell * and call pci_disable_msi, which requires that this 974a087146cSBrian Russell * irq has been freed. However, the device may have open 975a087146cSBrian Russell * FDs at the time of unregister and therefore may not be 976a087146cSBrian Russell * freed until they are released. 977a087146cSBrian Russell */ 9783d27c4deSXiubo Li ret = request_irq(info->irq, uio_interrupt, 9796427a765SEric W. Biederman info->irq_flags, info->name, idev); 98043279819SDan Carpenter if (ret) { 98143279819SDan Carpenter info->uio_dev = NULL; 982beafc54cSHans J. Koch goto err_request_irq; 983beafc54cSHans J. Koch } 98443279819SDan Carpenter } 985beafc54cSHans J. Koch 986beafc54cSHans J. Koch return 0; 987beafc54cSHans J. Koch 988beafc54cSHans J. Koch err_request_irq: 989beafc54cSHans J. Koch uio_dev_del_attributes(idev); 990beafc54cSHans J. Koch err_uio_dev_add_attributes: 991221a1f4aSLiu Jian device_del(&idev->dev); 992beafc54cSHans J. Koch err_device_create: 993beafc54cSHans J. Koch uio_free_minor(idev); 994221a1f4aSLiu Jian put_device(&idev->dev); 995beafc54cSHans J. Koch return ret; 996beafc54cSHans J. Koch } 997beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(__uio_register_device); 998beafc54cSHans J. Koch 999beafc54cSHans J. Koch /** 1000beafc54cSHans J. Koch * uio_unregister_device - unregister a industrial IO device 1001beafc54cSHans J. Koch * @info: UIO device capabilities 1002beafc54cSHans J. Koch * 1003beafc54cSHans J. Koch */ 1004beafc54cSHans J. Koch void uio_unregister_device(struct uio_info *info) 1005beafc54cSHans J. Koch { 1006beafc54cSHans J. Koch struct uio_device *idev; 1007beafc54cSHans J. Koch 1008beafc54cSHans J. Koch if (!info || !info->uio_dev) 1009beafc54cSHans J. Koch return; 1010beafc54cSHans J. Koch 1011beafc54cSHans J. Koch idev = info->uio_dev; 1012beafc54cSHans J. Koch 1013beafc54cSHans J. Koch uio_free_minor(idev); 1014beafc54cSHans J. Koch 101557c5f4dfSXiubo Li mutex_lock(&idev->info_lock); 1016beafc54cSHans J. Koch uio_dev_del_attributes(idev); 1017beafc54cSHans J. Koch 10189ff2c132SStephen Hemminger if (info->irq && info->irq != UIO_IRQ_CUSTOM) 10199ff2c132SStephen Hemminger free_irq(info->irq, idev); 1020a087146cSBrian Russell 1021a93e7b33SHamish Martin idev->info = NULL; 1022543af586SXiubo Li mutex_unlock(&idev->info_lock); 1023a93e7b33SHamish Martin 1024b5570ca7SZhaolong Zhang wake_up_interruptible(&idev->wait); 1025b5570ca7SZhaolong Zhang kill_fasync(&idev->async_queue, SIGIO, POLL_HUP); 1026b5570ca7SZhaolong Zhang 1027a93e7b33SHamish Martin device_unregister(&idev->dev); 1028beafc54cSHans J. Koch 1029beafc54cSHans J. Koch return; 1030beafc54cSHans J. Koch } 1031beafc54cSHans J. Koch EXPORT_SYMBOL_GPL(uio_unregister_device); 1032beafc54cSHans J. Koch 1033beafc54cSHans J. Koch static int __init uio_init(void) 1034beafc54cSHans J. Koch { 10353d4f9d76SEric W. Biederman return init_uio_class(); 1036beafc54cSHans J. Koch } 1037beafc54cSHans J. Koch 1038beafc54cSHans J. Koch static void __exit uio_exit(void) 1039beafc54cSHans J. Koch { 10403d4f9d76SEric W. Biederman release_uio_class(); 1041e2ef9393SJohannes Thumshirn idr_destroy(&uio_idr); 1042beafc54cSHans J. Koch } 1043beafc54cSHans J. Koch 1044beafc54cSHans J. Koch module_init(uio_init) 1045beafc54cSHans J. Koch module_exit(uio_exit) 1046beafc54cSHans J. Koch MODULE_LICENSE("GPL v2"); 1047