1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 232cf86f6SMauro Carvalho Chehab /* 332cf86f6SMauro Carvalho Chehab * LIRC base driver 432cf86f6SMauro Carvalho Chehab * 532cf86f6SMauro Carvalho Chehab * by Artur Lipowski <alipowski@interia.pl> 632cf86f6SMauro Carvalho Chehab */ 732cf86f6SMauro Carvalho Chehab 83fac0314SAndi Shyti #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 93fac0314SAndi Shyti 1032cf86f6SMauro Carvalho Chehab #include <linux/module.h> 1132cf86f6SMauro Carvalho Chehab #include <linux/mutex.h> 1232cf86f6SMauro Carvalho Chehab #include <linux/device.h> 13f4364dcfSSean Young #include <linux/file.h> 1446c8f477SDavid Härdeman #include <linux/idr.h> 15a6ddd4feSSean Young #include <linux/poll.h> 1642e0442fSSean Young #include <linux/sched.h> 1742e0442fSSean Young #include <linux/wait.h> 1832cf86f6SMauro Carvalho Chehab 19a60d64b1SSean Young #include "rc-core-priv.h" 20aefb5e34SSean Young #include <uapi/linux/lirc.h> 2132cf86f6SMauro Carvalho Chehab 225c4c8b4aSSean Young #define LIRCBUF_SIZE 1024 2332cf86f6SMauro Carvalho Chehab 2432cf86f6SMauro Carvalho Chehab static dev_t lirc_base_dev; 2532cf86f6SMauro Carvalho Chehab 2646c8f477SDavid Härdeman /* Used to keep track of allocated lirc devices */ 2746c8f477SDavid Härdeman static DEFINE_IDA(lirc_ida); 2832cf86f6SMauro Carvalho Chehab 2932cf86f6SMauro Carvalho Chehab /* Only used for sysfs but defined to void otherwise */ 3032cf86f6SMauro Carvalho Chehab static struct class *lirc_class; 3132cf86f6SMauro Carvalho Chehab 3242e0442fSSean Young /** 3342e0442fSSean Young * ir_lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace 3442e0442fSSean Young * 3542e0442fSSean Young * @dev: the struct rc_dev descriptor of the device 3642e0442fSSean Young * @ev: the struct ir_raw_event descriptor of the pulse/space 3742e0442fSSean Young */ 3842e0442fSSean Young void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev) 3932cf86f6SMauro Carvalho Chehab { 407e45d660SSean Young unsigned long flags; 417e45d660SSean Young struct lirc_fh *fh; 4242e0442fSSean Young int sample; 43a607f51eSSean Young 4442e0442fSSean Young /* Packet start */ 4542e0442fSSean Young if (ev.reset) { 4642e0442fSSean Young /* 4742e0442fSSean Young * Userspace expects a long space event before the start of 4842e0442fSSean Young * the signal to use as a sync. This may be done with repeat 4942e0442fSSean Young * packets and normal samples. But if a reset has been sent 5042e0442fSSean Young * then we assume that a long time has passed, so we send a 5142e0442fSSean Young * space with the maximum time value. 5242e0442fSSean Young */ 5342e0442fSSean Young sample = LIRC_SPACE(LIRC_VALUE_MASK); 541f17f684SSean Young dev_dbg(&dev->dev, "delivering reset sync space to lirc_dev\n"); 55b15e3937SDavid Härdeman 5642e0442fSSean Young /* Carrier reports */ 5742e0442fSSean Young } else if (ev.carrier_report) { 5842e0442fSSean Young sample = LIRC_FREQUENCY(ev.carrier); 591f17f684SSean Young dev_dbg(&dev->dev, "carrier report (freq: %d)\n", sample); 603381b779SDavid Härdeman 6142e0442fSSean Young /* Packet end */ 6242e0442fSSean Young } else if (ev.timeout) { 6342e0442fSSean Young if (dev->gap) 64b15e3937SDavid Härdeman return; 65b15e3937SDavid Härdeman 6642e0442fSSean Young dev->gap_start = ktime_get(); 6742e0442fSSean Young dev->gap = true; 6842e0442fSSean Young dev->gap_duration = ev.duration; 696ecccc37SDavid Härdeman 7042e0442fSSean Young sample = LIRC_TIMEOUT(ev.duration / 1000); 711f17f684SSean Young dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample); 7242e0442fSSean Young 7342e0442fSSean Young /* Normal sample */ 7442e0442fSSean Young } else { 7542e0442fSSean Young if (dev->gap) { 7642e0442fSSean Young dev->gap_duration += ktime_to_ns(ktime_sub(ktime_get(), 7742e0442fSSean Young dev->gap_start)); 7842e0442fSSean Young 7942e0442fSSean Young /* Convert to ms and cap by LIRC_VALUE_MASK */ 8042e0442fSSean Young do_div(dev->gap_duration, 1000); 8142e0442fSSean Young dev->gap_duration = min_t(u64, dev->gap_duration, 8242e0442fSSean Young LIRC_VALUE_MASK); 8342e0442fSSean Young 847e45d660SSean Young spin_lock_irqsave(&dev->lirc_fh_lock, flags); 857e45d660SSean Young list_for_each_entry(fh, &dev->lirc_fh, list) 867e45d660SSean Young kfifo_put(&fh->rawir, 877e45d660SSean Young LIRC_SPACE(dev->gap_duration)); 887e45d660SSean Young spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 8942e0442fSSean Young dev->gap = false; 9042e0442fSSean Young } 9142e0442fSSean Young 9242e0442fSSean Young sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) : 9342e0442fSSean Young LIRC_SPACE(ev.duration / 1000); 941f17f684SSean Young dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n", 9542e0442fSSean Young TO_US(ev.duration), TO_STR(ev.pulse)); 9642e0442fSSean Young } 9742e0442fSSean Young 98f4364dcfSSean Young /* 99f4364dcfSSean Young * bpf does not care about the gap generated above; that exists 100f4364dcfSSean Young * for backwards compatibility 101f4364dcfSSean Young */ 102f4364dcfSSean Young lirc_bpf_run(dev, sample); 103f4364dcfSSean Young 1047e45d660SSean Young spin_lock_irqsave(&dev->lirc_fh_lock, flags); 1057e45d660SSean Young list_for_each_entry(fh, &dev->lirc_fh, list) { 1067e45d660SSean Young if (LIRC_IS_TIMEOUT(sample) && !fh->send_timeout_reports) 1077e45d660SSean Young continue; 1087e45d660SSean Young if (kfifo_put(&fh->rawir, sample)) 109a9a08845SLinus Torvalds wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM); 1107e45d660SSean Young } 1117e45d660SSean Young spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 11242e0442fSSean Young } 11342e0442fSSean Young 11442e0442fSSean Young /** 11542e0442fSSean Young * ir_lirc_scancode_event() - Send scancode data to lirc to be relayed to 1167e45d660SSean Young * userspace. This can be called in atomic context. 11742e0442fSSean Young * @dev: the struct rc_dev descriptor of the device 11842e0442fSSean Young * @lsc: the struct lirc_scancode describing the decoded scancode 11942e0442fSSean Young */ 12042e0442fSSean Young void ir_lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc) 12132cf86f6SMauro Carvalho Chehab { 1227e45d660SSean Young unsigned long flags; 1237e45d660SSean Young struct lirc_fh *fh; 12432cf86f6SMauro Carvalho Chehab 12542e0442fSSean Young lsc->timestamp = ktime_get_ns(); 12642e0442fSSean Young 1277e45d660SSean Young spin_lock_irqsave(&dev->lirc_fh_lock, flags); 1287e45d660SSean Young list_for_each_entry(fh, &dev->lirc_fh, list) { 1297e45d660SSean Young if (kfifo_put(&fh->scancodes, *lsc)) 130a9a08845SLinus Torvalds wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM); 13132cf86f6SMauro Carvalho Chehab } 1327e45d660SSean Young spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 13332cf86f6SMauro Carvalho Chehab } 13442e0442fSSean Young EXPORT_SYMBOL_GPL(ir_lirc_scancode_event); 13532cf86f6SMauro Carvalho Chehab 13642e0442fSSean Young static int ir_lirc_open(struct inode *inode, struct file *file) 13732cf86f6SMauro Carvalho Chehab { 13842e0442fSSean Young struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev, 13942e0442fSSean Young lirc_cdev); 1407e45d660SSean Young struct lirc_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL); 1417e45d660SSean Young unsigned long flags; 142de226ec8SDavid Härdeman int retval; 14332cf86f6SMauro Carvalho Chehab 1447e45d660SSean Young if (!fh) 1457e45d660SSean Young return -ENOMEM; 14632cf86f6SMauro Carvalho Chehab 1477e45d660SSean Young get_device(&dev->dev); 1483381b779SDavid Härdeman 14942e0442fSSean Young if (!dev->registered) { 1503381b779SDavid Härdeman retval = -ENODEV; 1517e45d660SSean Young goto out_fh; 1523381b779SDavid Härdeman } 1533381b779SDavid Härdeman 1547e45d660SSean Young if (dev->driver_type == RC_DRIVER_IR_RAW) { 1557e45d660SSean Young if (kfifo_alloc(&fh->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL)) { 1567e45d660SSean Young retval = -ENOMEM; 1577e45d660SSean Young goto out_fh; 1587e45d660SSean Young } 1593381b779SDavid Härdeman } 16032cf86f6SMauro Carvalho Chehab 1617e45d660SSean Young if (dev->driver_type != RC_DRIVER_IR_RAW_TX) { 1627e45d660SSean Young if (kfifo_alloc(&fh->scancodes, 32, GFP_KERNEL)) { 1637e45d660SSean Young retval = -ENOMEM; 1647e45d660SSean Young goto out_rawir; 1657e45d660SSean Young } 1667e45d660SSean Young } 16742e0442fSSean Young 1687e45d660SSean Young fh->send_mode = LIRC_MODE_PULSE; 1697e45d660SSean Young fh->rc = dev; 1707e45d660SSean Young fh->send_timeout_reports = true; 1717e45d660SSean Young 1727e45d660SSean Young if (dev->driver_type == RC_DRIVER_SCANCODE) 1737e45d660SSean Young fh->rec_mode = LIRC_MODE_SCANCODE; 1747e45d660SSean Young else 1757e45d660SSean Young fh->rec_mode = LIRC_MODE_MODE2; 1767e45d660SSean Young 1777e45d660SSean Young retval = rc_open(dev); 178ca7a722dSSrinivas Kandagatla if (retval) 1797e45d660SSean Young goto out_kfifo; 180ca7a722dSSrinivas Kandagatla 1817e45d660SSean Young init_waitqueue_head(&fh->wait_poll); 1822c5a1f44SDavid Härdeman 1837e45d660SSean Young file->private_data = fh; 1847e45d660SSean Young spin_lock_irqsave(&dev->lirc_fh_lock, flags); 1857e45d660SSean Young list_add(&fh->list, &dev->lirc_fh); 1867e45d660SSean Young spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 18732cf86f6SMauro Carvalho Chehab 188c5bf68feSKirill Smelkov stream_open(inode, file); 18932cf86f6SMauro Carvalho Chehab 190de226ec8SDavid Härdeman return 0; 1917e45d660SSean Young out_kfifo: 1927e45d660SSean Young if (dev->driver_type != RC_DRIVER_IR_RAW_TX) 1937e45d660SSean Young kfifo_free(&fh->scancodes); 1947e45d660SSean Young out_rawir: 1957e45d660SSean Young if (dev->driver_type == RC_DRIVER_IR_RAW) 1967e45d660SSean Young kfifo_free(&fh->rawir); 1977e45d660SSean Young out_fh: 1987e45d660SSean Young kfree(fh); 1997e45d660SSean Young put_device(&dev->dev); 2003381b779SDavid Härdeman 2013381b779SDavid Härdeman return retval; 20232cf86f6SMauro Carvalho Chehab } 20332cf86f6SMauro Carvalho Chehab 20442e0442fSSean Young static int ir_lirc_close(struct inode *inode, struct file *file) 20532cf86f6SMauro Carvalho Chehab { 2067e45d660SSean Young struct lirc_fh *fh = file->private_data; 2077e45d660SSean Young struct rc_dev *dev = fh->rc; 2087e45d660SSean Young unsigned long flags; 20932cf86f6SMauro Carvalho Chehab 2107e45d660SSean Young spin_lock_irqsave(&dev->lirc_fh_lock, flags); 2117e45d660SSean Young list_del(&fh->list); 2127e45d660SSean Young spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 21332cf86f6SMauro Carvalho Chehab 2147e45d660SSean Young if (dev->driver_type == RC_DRIVER_IR_RAW) 2157e45d660SSean Young kfifo_free(&fh->rawir); 2167e45d660SSean Young if (dev->driver_type != RC_DRIVER_IR_RAW_TX) 2177e45d660SSean Young kfifo_free(&fh->scancodes); 2187e45d660SSean Young kfree(fh); 2193381b779SDavid Härdeman 22042e0442fSSean Young rc_close(dev); 2217e45d660SSean Young put_device(&dev->dev); 22232cf86f6SMauro Carvalho Chehab 22332cf86f6SMauro Carvalho Chehab return 0; 22432cf86f6SMauro Carvalho Chehab } 22532cf86f6SMauro Carvalho Chehab 22642e0442fSSean Young static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf, 22742e0442fSSean Young size_t n, loff_t *ppos) 22832cf86f6SMauro Carvalho Chehab { 2297e45d660SSean Young struct lirc_fh *fh = file->private_data; 2307e45d660SSean Young struct rc_dev *dev = fh->rc; 231a74b2bffSSean Young unsigned int *txbuf; 23242e0442fSSean Young struct ir_raw_event *raw = NULL; 2334957133fSSean Young ssize_t ret; 23442e0442fSSean Young size_t count; 23542e0442fSSean Young ktime_t start; 23642e0442fSSean Young s64 towait; 23742e0442fSSean Young unsigned int duration = 0; /* signal duration in us */ 23842e0442fSSean Young int i; 23932cf86f6SMauro Carvalho Chehab 2404957133fSSean Young ret = mutex_lock_interruptible(&dev->lock); 2414957133fSSean Young if (ret) 2424957133fSSean Young return ret; 24332cf86f6SMauro Carvalho Chehab 2444957133fSSean Young if (!dev->registered) { 2454957133fSSean Young ret = -ENODEV; 246a74b2bffSSean Young goto out_unlock; 247b15e3937SDavid Härdeman } 24832cf86f6SMauro Carvalho Chehab 24942e0442fSSean Young if (!dev->tx_ir) { 25042e0442fSSean Young ret = -EINVAL; 251a74b2bffSSean Young goto out_unlock; 25242e0442fSSean Young } 25342e0442fSSean Young 2547e45d660SSean Young if (fh->send_mode == LIRC_MODE_SCANCODE) { 25542e0442fSSean Young struct lirc_scancode scan; 25642e0442fSSean Young 2574957133fSSean Young if (n != sizeof(scan)) { 2584957133fSSean Young ret = -EINVAL; 259a74b2bffSSean Young goto out_unlock; 2604957133fSSean Young } 26142e0442fSSean Young 2624957133fSSean Young if (copy_from_user(&scan, buf, sizeof(scan))) { 2634957133fSSean Young ret = -EFAULT; 264a74b2bffSSean Young goto out_unlock; 2654957133fSSean Young } 26642e0442fSSean Young 2674957133fSSean Young if (scan.flags || scan.keycode || scan.timestamp) { 2684957133fSSean Young ret = -EINVAL; 269a74b2bffSSean Young goto out_unlock; 2704957133fSSean Young } 27142e0442fSSean Young 27242e0442fSSean Young /* 27342e0442fSSean Young * The scancode field in lirc_scancode is 64-bit simply 27442e0442fSSean Young * to future-proof it, since there are IR protocols encode 27542e0442fSSean Young * use more than 32 bits. For now only 32-bit protocols 27642e0442fSSean Young * are supported. 27742e0442fSSean Young */ 27842e0442fSSean Young if (scan.scancode > U32_MAX || 2794957133fSSean Young !rc_validate_scancode(scan.rc_proto, scan.scancode)) { 2804957133fSSean Young ret = -EINVAL; 281a74b2bffSSean Young goto out_unlock; 2824957133fSSean Young } 28342e0442fSSean Young 28442e0442fSSean Young raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL); 2854957133fSSean Young if (!raw) { 2864957133fSSean Young ret = -ENOMEM; 287a74b2bffSSean Young goto out_unlock; 2884957133fSSean Young } 28942e0442fSSean Young 29042e0442fSSean Young ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode, 29142e0442fSSean Young raw, LIRCBUF_SIZE); 29242e0442fSSean Young if (ret < 0) 2938d25e15dSColin Ian King goto out_kfree_raw; 29442e0442fSSean Young 29542e0442fSSean Young count = ret; 29642e0442fSSean Young 29742e0442fSSean Young txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL); 29842e0442fSSean Young if (!txbuf) { 29942e0442fSSean Young ret = -ENOMEM; 3008d25e15dSColin Ian King goto out_kfree_raw; 30142e0442fSSean Young } 30242e0442fSSean Young 30342e0442fSSean Young for (i = 0; i < count; i++) 30442e0442fSSean Young /* Convert from NS to US */ 30542e0442fSSean Young txbuf[i] = DIV_ROUND_UP(raw[i].duration, 1000); 30642e0442fSSean Young 30742e0442fSSean Young if (dev->s_tx_carrier) { 30842e0442fSSean Young int carrier = ir_raw_encode_carrier(scan.rc_proto); 30942e0442fSSean Young 31042e0442fSSean Young if (carrier > 0) 31142e0442fSSean Young dev->s_tx_carrier(dev, carrier); 31242e0442fSSean Young } 31342e0442fSSean Young } else { 3144957133fSSean Young if (n < sizeof(unsigned int) || n % sizeof(unsigned int)) { 3154957133fSSean Young ret = -EINVAL; 316a74b2bffSSean Young goto out_unlock; 3174957133fSSean Young } 31842e0442fSSean Young 31942e0442fSSean Young count = n / sizeof(unsigned int); 3204957133fSSean Young if (count > LIRCBUF_SIZE || count % 2 == 0) { 3214957133fSSean Young ret = -EINVAL; 322a74b2bffSSean Young goto out_unlock; 3234957133fSSean Young } 32442e0442fSSean Young 32542e0442fSSean Young txbuf = memdup_user(buf, n); 3264957133fSSean Young if (IS_ERR(txbuf)) { 3274957133fSSean Young ret = PTR_ERR(txbuf); 328a74b2bffSSean Young goto out_unlock; 3294957133fSSean Young } 33042e0442fSSean Young } 33142e0442fSSean Young 33242e0442fSSean Young for (i = 0; i < count; i++) { 33342e0442fSSean Young if (txbuf[i] > IR_MAX_DURATION / 1000 - duration || !txbuf[i]) { 33442e0442fSSean Young ret = -EINVAL; 335a74b2bffSSean Young goto out_kfree; 33642e0442fSSean Young } 33742e0442fSSean Young 33842e0442fSSean Young duration += txbuf[i]; 33942e0442fSSean Young } 34042e0442fSSean Young 34129422737SSean Young start = ktime_get(); 34229422737SSean Young 34342e0442fSSean Young ret = dev->tx_ir(dev, txbuf, count); 34442e0442fSSean Young if (ret < 0) 345a74b2bffSSean Young goto out_kfree; 34642e0442fSSean Young 347f81a8158SSean Young kfree(txbuf); 348f81a8158SSean Young kfree(raw); 349f81a8158SSean Young mutex_unlock(&dev->lock); 350f81a8158SSean Young 35142e0442fSSean Young /* 35242e0442fSSean Young * The lircd gap calculation expects the write function to 35342e0442fSSean Young * wait for the actual IR signal to be transmitted before 35442e0442fSSean Young * returning. 35542e0442fSSean Young */ 35642e0442fSSean Young towait = ktime_us_delta(ktime_add_us(start, duration), 35742e0442fSSean Young ktime_get()); 35842e0442fSSean Young if (towait > 0) { 35942e0442fSSean Young set_current_state(TASK_INTERRUPTIBLE); 36042e0442fSSean Young schedule_timeout(usecs_to_jiffies(towait)); 36142e0442fSSean Young } 36242e0442fSSean Young 363f81a8158SSean Young return n; 364a74b2bffSSean Young out_kfree: 36542e0442fSSean Young kfree(txbuf); 3668d25e15dSColin Ian King out_kfree_raw: 36742e0442fSSean Young kfree(raw); 368a74b2bffSSean Young out_unlock: 369a74b2bffSSean Young mutex_unlock(&dev->lock); 37032cf86f6SMauro Carvalho Chehab return ret; 37132cf86f6SMauro Carvalho Chehab } 37232cf86f6SMauro Carvalho Chehab 3737e45d660SSean Young static long ir_lirc_ioctl(struct file *file, unsigned int cmd, 37442e0442fSSean Young unsigned long arg) 37532cf86f6SMauro Carvalho Chehab { 3767e45d660SSean Young struct lirc_fh *fh = file->private_data; 3777e45d660SSean Young struct rc_dev *dev = fh->rc; 37842e0442fSSean Young u32 __user *argp = (u32 __user *)(arg); 3794957133fSSean Young u32 val = 0; 3804957133fSSean Young int ret; 38132cf86f6SMauro Carvalho Chehab 38242e0442fSSean Young if (_IOC_DIR(cmd) & _IOC_WRITE) { 38342e0442fSSean Young ret = get_user(val, argp); 38442e0442fSSean Young if (ret) 38542e0442fSSean Young return ret; 38642e0442fSSean Young } 38732cf86f6SMauro Carvalho Chehab 3884957133fSSean Young ret = mutex_lock_interruptible(&dev->lock); 3894957133fSSean Young if (ret) 3904957133fSSean Young return ret; 39132cf86f6SMauro Carvalho Chehab 3924957133fSSean Young if (!dev->registered) { 3934957133fSSean Young ret = -ENODEV; 3943381b779SDavid Härdeman goto out; 3953381b779SDavid Härdeman } 39632cf86f6SMauro Carvalho Chehab 39732cf86f6SMauro Carvalho Chehab switch (cmd) { 39832cf86f6SMauro Carvalho Chehab case LIRC_GET_FEATURES: 39942e0442fSSean Young if (dev->driver_type == RC_DRIVER_SCANCODE) 40042e0442fSSean Young val |= LIRC_CAN_REC_SCANCODE; 40142e0442fSSean Young 40242e0442fSSean Young if (dev->driver_type == RC_DRIVER_IR_RAW) { 40302d742f4SSean Young val |= LIRC_CAN_REC_MODE2; 40442e0442fSSean Young if (dev->rx_resolution) 40542e0442fSSean Young val |= LIRC_CAN_GET_REC_RESOLUTION; 40642e0442fSSean Young } 40742e0442fSSean Young 40842e0442fSSean Young if (dev->tx_ir) { 40902d742f4SSean Young val |= LIRC_CAN_SEND_PULSE; 41042e0442fSSean Young if (dev->s_tx_mask) 41142e0442fSSean Young val |= LIRC_CAN_SET_TRANSMITTER_MASK; 41242e0442fSSean Young if (dev->s_tx_carrier) 41342e0442fSSean Young val |= LIRC_CAN_SET_SEND_CARRIER; 41442e0442fSSean Young if (dev->s_tx_duty_cycle) 41542e0442fSSean Young val |= LIRC_CAN_SET_SEND_DUTY_CYCLE; 41642e0442fSSean Young } 41742e0442fSSean Young 41842e0442fSSean Young if (dev->s_rx_carrier_range) 41942e0442fSSean Young val |= LIRC_CAN_SET_REC_CARRIER | 42042e0442fSSean Young LIRC_CAN_SET_REC_CARRIER_RANGE; 42142e0442fSSean Young 42242e0442fSSean Young if (dev->s_learning_mode) 42342e0442fSSean Young val |= LIRC_CAN_USE_WIDEBAND_RECEIVER; 42442e0442fSSean Young 42542e0442fSSean Young if (dev->s_carrier_report) 42642e0442fSSean Young val |= LIRC_CAN_MEASURE_CARRIER; 42742e0442fSSean Young 42842e0442fSSean Young if (dev->max_timeout) 42942e0442fSSean Young val |= LIRC_CAN_SET_REC_TIMEOUT; 43042e0442fSSean Young 43132cf86f6SMauro Carvalho Chehab break; 43242e0442fSSean Young 43342e0442fSSean Young /* mode support */ 43432cf86f6SMauro Carvalho Chehab case LIRC_GET_REC_MODE: 43542e0442fSSean Young if (dev->driver_type == RC_DRIVER_IR_RAW_TX) 4364957133fSSean Young ret = -ENOTTY; 4374957133fSSean Young else 4387e45d660SSean Young val = fh->rec_mode; 43932cf86f6SMauro Carvalho Chehab break; 44032cf86f6SMauro Carvalho Chehab 44132cf86f6SMauro Carvalho Chehab case LIRC_SET_REC_MODE: 44242e0442fSSean Young switch (dev->driver_type) { 44342e0442fSSean Young case RC_DRIVER_IR_RAW_TX: 4444957133fSSean Young ret = -ENOTTY; 4454957133fSSean Young break; 44642e0442fSSean Young case RC_DRIVER_SCANCODE: 44742e0442fSSean Young if (val != LIRC_MODE_SCANCODE) 4484957133fSSean Young ret = -EINVAL; 44942e0442fSSean Young break; 45042e0442fSSean Young case RC_DRIVER_IR_RAW: 45142e0442fSSean Young if (!(val == LIRC_MODE_MODE2 || 45242e0442fSSean Young val == LIRC_MODE_SCANCODE)) 4534957133fSSean Young ret = -EINVAL; 45432cf86f6SMauro Carvalho Chehab break; 45532cf86f6SMauro Carvalho Chehab } 45632cf86f6SMauro Carvalho Chehab 4574957133fSSean Young if (!ret) 4587e45d660SSean Young fh->rec_mode = val; 45932cf86f6SMauro Carvalho Chehab break; 46042e0442fSSean Young 46142e0442fSSean Young case LIRC_GET_SEND_MODE: 46242e0442fSSean Young if (!dev->tx_ir) 4634957133fSSean Young ret = -ENOTTY; 4644957133fSSean Young else 4657e45d660SSean Young val = fh->send_mode; 46632cf86f6SMauro Carvalho Chehab break; 46742e0442fSSean Young 46842e0442fSSean Young case LIRC_SET_SEND_MODE: 46942e0442fSSean Young if (!dev->tx_ir) 4704957133fSSean Young ret = -ENOTTY; 4714957133fSSean Young else if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE)) 4724957133fSSean Young ret = -EINVAL; 4734957133fSSean Young else 4747e45d660SSean Young fh->send_mode = val; 4754957133fSSean Young break; 47642e0442fSSean Young 47742e0442fSSean Young /* TX settings */ 47842e0442fSSean Young case LIRC_SET_TRANSMITTER_MASK: 47942e0442fSSean Young if (!dev->s_tx_mask) 4804957133fSSean Young ret = -ENOTTY; 4814957133fSSean Young else 4824957133fSSean Young ret = dev->s_tx_mask(dev, val); 4834957133fSSean Young break; 48442e0442fSSean Young 48542e0442fSSean Young case LIRC_SET_SEND_CARRIER: 48642e0442fSSean Young if (!dev->s_tx_carrier) 4874957133fSSean Young ret = -ENOTTY; 4884957133fSSean Young else 4894957133fSSean Young ret = dev->s_tx_carrier(dev, val); 4904957133fSSean Young break; 49142e0442fSSean Young 49242e0442fSSean Young case LIRC_SET_SEND_DUTY_CYCLE: 49342e0442fSSean Young if (!dev->s_tx_duty_cycle) 4944957133fSSean Young ret = -ENOTTY; 4954957133fSSean Young else if (val <= 0 || val >= 100) 4964957133fSSean Young ret = -EINVAL; 4974957133fSSean Young else 4984957133fSSean Young ret = dev->s_tx_duty_cycle(dev, val); 4994957133fSSean Young break; 50042e0442fSSean Young 50142e0442fSSean Young /* RX settings */ 50242e0442fSSean Young case LIRC_SET_REC_CARRIER: 50342e0442fSSean Young if (!dev->s_rx_carrier_range) 5044957133fSSean Young ret = -ENOTTY; 5054957133fSSean Young else if (val <= 0) 5064957133fSSean Young ret = -EINVAL; 5074957133fSSean Young else 5084957133fSSean Young ret = dev->s_rx_carrier_range(dev, fh->carrier_low, 50942e0442fSSean Young val); 5104957133fSSean Young break; 51142e0442fSSean Young 51242e0442fSSean Young case LIRC_SET_REC_CARRIER_RANGE: 51342e0442fSSean Young if (!dev->s_rx_carrier_range) 5144957133fSSean Young ret = -ENOTTY; 5154957133fSSean Young else if (val <= 0) 5164957133fSSean Young ret = -EINVAL; 5174957133fSSean Young else 5187e45d660SSean Young fh->carrier_low = val; 5194957133fSSean Young break; 52042e0442fSSean Young 52142e0442fSSean Young case LIRC_GET_REC_RESOLUTION: 52242e0442fSSean Young if (!dev->rx_resolution) 5234957133fSSean Young ret = -ENOTTY; 5244957133fSSean Young else 52542e0442fSSean Young val = dev->rx_resolution / 1000; 52642e0442fSSean Young break; 52742e0442fSSean Young 52842e0442fSSean Young case LIRC_SET_WIDEBAND_RECEIVER: 52942e0442fSSean Young if (!dev->s_learning_mode) 5304957133fSSean Young ret = -ENOTTY; 5314957133fSSean Young else 5324957133fSSean Young ret = dev->s_learning_mode(dev, !!val); 5334957133fSSean Young break; 53442e0442fSSean Young 53542e0442fSSean Young case LIRC_SET_MEASURE_CARRIER_MODE: 53642e0442fSSean Young if (!dev->s_carrier_report) 5374957133fSSean Young ret = -ENOTTY; 5384957133fSSean Young else 5394957133fSSean Young ret = dev->s_carrier_report(dev, !!val); 5404957133fSSean Young break; 54142e0442fSSean Young 54242e0442fSSean Young /* Generic timeout support */ 54342e0442fSSean Young case LIRC_GET_MIN_TIMEOUT: 54442e0442fSSean Young if (!dev->max_timeout) 5454957133fSSean Young ret = -ENOTTY; 5464957133fSSean Young else 54742e0442fSSean Young val = DIV_ROUND_UP(dev->min_timeout, 1000); 54842e0442fSSean Young break; 54942e0442fSSean Young 55042e0442fSSean Young case LIRC_GET_MAX_TIMEOUT: 55142e0442fSSean Young if (!dev->max_timeout) 5524957133fSSean Young ret = -ENOTTY; 5534957133fSSean Young else 55442e0442fSSean Young val = dev->max_timeout / 1000; 55542e0442fSSean Young break; 55642e0442fSSean Young 55742e0442fSSean Young case LIRC_SET_REC_TIMEOUT: 5584957133fSSean Young if (!dev->max_timeout) { 5594957133fSSean Young ret = -ENOTTY; 5604957133fSSean Young } else if (val > U32_MAX / 1000) { 56142e0442fSSean Young /* Check for multiply overflow */ 5624957133fSSean Young ret = -EINVAL; 5634957133fSSean Young } else { 5644957133fSSean Young u32 tmp = val * 1000; 56542e0442fSSean Young 56642e0442fSSean Young if (tmp < dev->min_timeout || tmp > dev->max_timeout) 5674957133fSSean Young ret = -EINVAL; 5684957133fSSean Young else if (dev->s_timeout) 56942e0442fSSean Young ret = dev->s_timeout(dev, tmp); 570c2837ad0SSean Young else 57142e0442fSSean Young dev->timeout = tmp; 57232cf86f6SMauro Carvalho Chehab } 57342e0442fSSean Young break; 57442e0442fSSean Young 57595d1544eSSean Young case LIRC_GET_REC_TIMEOUT: 57642e0442fSSean Young if (!dev->timeout) 5774957133fSSean Young ret = -ENOTTY; 5784957133fSSean Young else 57995d1544eSSean Young val = DIV_ROUND_UP(dev->timeout, 1000); 58095d1544eSSean Young break; 58195d1544eSSean Young 58242e0442fSSean Young case LIRC_SET_REC_TIMEOUT_REPORTS: 58328492256SSean Young if (dev->driver_type != RC_DRIVER_IR_RAW) 58442e0442fSSean Young ret = -ENOTTY; 58542e0442fSSean Young else 5867e45d660SSean Young fh->send_timeout_reports = !!val; 58742e0442fSSean Young break; 58842e0442fSSean Young 58942e0442fSSean Young default: 5904957133fSSean Young ret = -ENOTTY; 59142e0442fSSean Young } 59242e0442fSSean Young 5934957133fSSean Young if (!ret && _IOC_DIR(cmd) & _IOC_READ) 59442e0442fSSean Young ret = put_user(val, argp); 59532cf86f6SMauro Carvalho Chehab 5963381b779SDavid Härdeman out: 5974957133fSSean Young mutex_unlock(&dev->lock); 5983381b779SDavid Härdeman return ret; 59932cf86f6SMauro Carvalho Chehab } 6003381b779SDavid Härdeman 60168c5735eSLinus Torvalds static __poll_t ir_lirc_poll(struct file *file, struct poll_table_struct *wait) 602615cd3feSDavid Härdeman { 6037e45d660SSean Young struct lirc_fh *fh = file->private_data; 6047e45d660SSean Young struct rc_dev *rcdev = fh->rc; 60568c5735eSLinus Torvalds __poll_t events = 0; 606615cd3feSDavid Härdeman 6077e45d660SSean Young poll_wait(file, &fh->wait_poll, wait); 60842e0442fSSean Young 60942e0442fSSean Young if (!rcdev->registered) { 610a9a08845SLinus Torvalds events = EPOLLHUP | EPOLLERR; 61142e0442fSSean Young } else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) { 6127e45d660SSean Young if (fh->rec_mode == LIRC_MODE_SCANCODE && 6137e45d660SSean Young !kfifo_is_empty(&fh->scancodes)) 614a9a08845SLinus Torvalds events = EPOLLIN | EPOLLRDNORM; 61542e0442fSSean Young 6167e45d660SSean Young if (fh->rec_mode == LIRC_MODE_MODE2 && 6177e45d660SSean Young !kfifo_is_empty(&fh->rawir)) 618a9a08845SLinus Torvalds events = EPOLLIN | EPOLLRDNORM; 619615cd3feSDavid Härdeman } 620615cd3feSDavid Härdeman 62142e0442fSSean Young return events; 62242e0442fSSean Young } 62342e0442fSSean Young 62442e0442fSSean Young static ssize_t ir_lirc_read_mode2(struct file *file, char __user *buffer, 62542e0442fSSean Young size_t length) 62632cf86f6SMauro Carvalho Chehab { 6277e45d660SSean Young struct lirc_fh *fh = file->private_data; 6287e45d660SSean Young struct rc_dev *rcdev = fh->rc; 62942e0442fSSean Young unsigned int copied; 63042e0442fSSean Young int ret; 631615cd3feSDavid Härdeman 63242e0442fSSean Young if (length < sizeof(unsigned int) || length % sizeof(unsigned int)) 63342e0442fSSean Young return -EINVAL; 63442e0442fSSean Young 63542e0442fSSean Young do { 6367e45d660SSean Young if (kfifo_is_empty(&fh->rawir)) { 63742e0442fSSean Young if (file->f_flags & O_NONBLOCK) 63842e0442fSSean Young return -EAGAIN; 63942e0442fSSean Young 6407e45d660SSean Young ret = wait_event_interruptible(fh->wait_poll, 6417e45d660SSean Young !kfifo_is_empty(&fh->rawir) || 64242e0442fSSean Young !rcdev->registered); 64342e0442fSSean Young if (ret) 64442e0442fSSean Young return ret; 64532cf86f6SMauro Carvalho Chehab } 64632cf86f6SMauro Carvalho Chehab 64742e0442fSSean Young if (!rcdev->registered) 64842e0442fSSean Young return -ENODEV; 64932cf86f6SMauro Carvalho Chehab 65042e0442fSSean Young ret = mutex_lock_interruptible(&rcdev->lock); 65142e0442fSSean Young if (ret) 65242e0442fSSean Young return ret; 6537e45d660SSean Young ret = kfifo_to_user(&fh->rawir, buffer, length, &copied); 65442e0442fSSean Young mutex_unlock(&rcdev->lock); 65542e0442fSSean Young if (ret) 65642e0442fSSean Young return ret; 65742e0442fSSean Young } while (copied == 0); 65842e0442fSSean Young 65942e0442fSSean Young return copied; 66042e0442fSSean Young } 66142e0442fSSean Young 66242e0442fSSean Young static ssize_t ir_lirc_read_scancode(struct file *file, char __user *buffer, 66342e0442fSSean Young size_t length) 66442e0442fSSean Young { 6657e45d660SSean Young struct lirc_fh *fh = file->private_data; 6667e45d660SSean Young struct rc_dev *rcdev = fh->rc; 66742e0442fSSean Young unsigned int copied; 66842e0442fSSean Young int ret; 66942e0442fSSean Young 67042e0442fSSean Young if (length < sizeof(struct lirc_scancode) || 67142e0442fSSean Young length % sizeof(struct lirc_scancode)) 67242e0442fSSean Young return -EINVAL; 67342e0442fSSean Young 67442e0442fSSean Young do { 6757e45d660SSean Young if (kfifo_is_empty(&fh->scancodes)) { 67642e0442fSSean Young if (file->f_flags & O_NONBLOCK) 67742e0442fSSean Young return -EAGAIN; 67842e0442fSSean Young 6797e45d660SSean Young ret = wait_event_interruptible(fh->wait_poll, 6807e45d660SSean Young !kfifo_is_empty(&fh->scancodes) || 68142e0442fSSean Young !rcdev->registered); 68242e0442fSSean Young if (ret) 68342e0442fSSean Young return ret; 68442e0442fSSean Young } 68542e0442fSSean Young 68642e0442fSSean Young if (!rcdev->registered) 68742e0442fSSean Young return -ENODEV; 68842e0442fSSean Young 68942e0442fSSean Young ret = mutex_lock_interruptible(&rcdev->lock); 69042e0442fSSean Young if (ret) 69142e0442fSSean Young return ret; 6927e45d660SSean Young ret = kfifo_to_user(&fh->scancodes, buffer, length, &copied); 69342e0442fSSean Young mutex_unlock(&rcdev->lock); 69442e0442fSSean Young if (ret) 69542e0442fSSean Young return ret; 69642e0442fSSean Young } while (copied == 0); 69742e0442fSSean Young 69842e0442fSSean Young return copied; 69942e0442fSSean Young } 70042e0442fSSean Young 70142e0442fSSean Young static ssize_t ir_lirc_read(struct file *file, char __user *buffer, 70242e0442fSSean Young size_t length, loff_t *ppos) 70342e0442fSSean Young { 7047e45d660SSean Young struct lirc_fh *fh = file->private_data; 7057e45d660SSean Young struct rc_dev *rcdev = fh->rc; 70642e0442fSSean Young 70742e0442fSSean Young if (rcdev->driver_type == RC_DRIVER_IR_RAW_TX) 70842e0442fSSean Young return -EINVAL; 70942e0442fSSean Young 71042e0442fSSean Young if (!rcdev->registered) 71142e0442fSSean Young return -ENODEV; 71242e0442fSSean Young 7137e45d660SSean Young if (fh->rec_mode == LIRC_MODE_MODE2) 71442e0442fSSean Young return ir_lirc_read_mode2(file, buffer, length); 71542e0442fSSean Young else /* LIRC_MODE_SCANCODE */ 71642e0442fSSean Young return ir_lirc_read_scancode(file, buffer, length); 71742e0442fSSean Young } 71842e0442fSSean Young 71942e0442fSSean Young static const struct file_operations lirc_fops = { 72042e0442fSSean Young .owner = THIS_MODULE, 72142e0442fSSean Young .write = ir_lirc_transmit_ir, 72242e0442fSSean Young .unlocked_ioctl = ir_lirc_ioctl, 723*1832f2d8SArnd Bergmann .compat_ioctl = compat_ptr_ioctl, 72442e0442fSSean Young .read = ir_lirc_read, 72542e0442fSSean Young .poll = ir_lirc_poll, 72642e0442fSSean Young .open = ir_lirc_open, 72742e0442fSSean Young .release = ir_lirc_close, 72842e0442fSSean Young .llseek = no_llseek, 72942e0442fSSean Young }; 73042e0442fSSean Young 73132cf86f6SMauro Carvalho Chehab static void lirc_release_device(struct device *ld) 73232cf86f6SMauro Carvalho Chehab { 733a6ddd4feSSean Young struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev); 73432cf86f6SMauro Carvalho Chehab 735a6ddd4feSSean Young put_device(&rcdev->dev); 73632cf86f6SMauro Carvalho Chehab } 73732cf86f6SMauro Carvalho Chehab 738a6ddd4feSSean Young int ir_lirc_register(struct rc_dev *dev) 73932cf86f6SMauro Carvalho Chehab { 740ed8c34d7SSean Young const char *rx_type, *tx_type; 741a6ddd4feSSean Young int err, minor; 74232cf86f6SMauro Carvalho Chehab 7437e45d660SSean Young minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, GFP_KERNEL); 7447e45d660SSean Young if (minor < 0) 7457e45d660SSean Young return minor; 7467e45d660SSean Young 747a6ddd4feSSean Young device_initialize(&dev->lirc_dev); 748a6ddd4feSSean Young dev->lirc_dev.class = lirc_class; 749a6ddd4feSSean Young dev->lirc_dev.parent = &dev->dev; 7507e45d660SSean Young dev->lirc_dev.release = lirc_release_device; 751a6ddd4feSSean Young dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor); 752a6ddd4feSSean Young dev_set_name(&dev->lirc_dev, "lirc%d", minor); 75332cf86f6SMauro Carvalho Chehab 7547e45d660SSean Young INIT_LIST_HEAD(&dev->lirc_fh); 7557e45d660SSean Young spin_lock_init(&dev->lirc_fh_lock); 7567e45d660SSean Young 757a6ddd4feSSean Young cdev_init(&dev->lirc_cdev, &lirc_fops); 75832cf86f6SMauro Carvalho Chehab 759a6ddd4feSSean Young err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev); 760a6ddd4feSSean Young if (err) 761a6ddd4feSSean Young goto out_ida; 762a6ddd4feSSean Young 763a6ddd4feSSean Young get_device(&dev->dev); 764a6ddd4feSSean Young 765ed8c34d7SSean Young switch (dev->driver_type) { 766ed8c34d7SSean Young case RC_DRIVER_SCANCODE: 767ed8c34d7SSean Young rx_type = "scancode"; 768ed8c34d7SSean Young break; 769ed8c34d7SSean Young case RC_DRIVER_IR_RAW: 770ed8c34d7SSean Young rx_type = "raw IR"; 771ed8c34d7SSean Young break; 772ed8c34d7SSean Young default: 773ed8c34d7SSean Young rx_type = "no"; 774ed8c34d7SSean Young break; 775ed8c34d7SSean Young } 776ed8c34d7SSean Young 777ed8c34d7SSean Young if (dev->tx_ir) 778ed8c34d7SSean Young tx_type = "raw IR"; 779ed8c34d7SSean Young else 780ed8c34d7SSean Young tx_type = "no"; 781ed8c34d7SSean Young 782ed8c34d7SSean Young dev_info(&dev->dev, "lirc_dev: driver %s registered at minor = %d, %s receiver, %s transmitter", 783ed8c34d7SSean Young dev->driver_name, minor, rx_type, tx_type); 784a6ddd4feSSean Young 785a6ddd4feSSean Young return 0; 786a6ddd4feSSean Young 787a6ddd4feSSean Young out_ida: 78832cf86f6SMauro Carvalho Chehab ida_simple_remove(&lirc_ida, minor); 78932cf86f6SMauro Carvalho Chehab return err; 79032cf86f6SMauro Carvalho Chehab } 79132cf86f6SMauro Carvalho Chehab 792a6ddd4feSSean Young void ir_lirc_unregister(struct rc_dev *dev) 79332cf86f6SMauro Carvalho Chehab { 7947e45d660SSean Young unsigned long flags; 7957e45d660SSean Young struct lirc_fh *fh; 7967e45d660SSean Young 797a6ddd4feSSean Young dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n", 798a6ddd4feSSean Young dev->driver_name, MINOR(dev->lirc_dev.devt)); 79971695affSSean Young 8007e45d660SSean Young spin_lock_irqsave(&dev->lirc_fh_lock, flags); 8017e45d660SSean Young list_for_each_entry(fh, &dev->lirc_fh, list) 802a9a08845SLinus Torvalds wake_up_poll(&fh->wait_poll, EPOLLHUP | EPOLLERR); 8037e45d660SSean Young spin_unlock_irqrestore(&dev->lirc_fh_lock, flags); 80432cf86f6SMauro Carvalho Chehab 805a6ddd4feSSean Young cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev); 806a6ddd4feSSean Young ida_simple_remove(&lirc_ida, MINOR(dev->lirc_dev.devt)); 80732cf86f6SMauro Carvalho Chehab } 80832cf86f6SMauro Carvalho Chehab 809a60d64b1SSean Young int __init lirc_dev_init(void) 81032cf86f6SMauro Carvalho Chehab { 81132cf86f6SMauro Carvalho Chehab int retval; 81232cf86f6SMauro Carvalho Chehab 81332cf86f6SMauro Carvalho Chehab lirc_class = class_create(THIS_MODULE, "lirc"); 81432cf86f6SMauro Carvalho Chehab if (IS_ERR(lirc_class)) { 8153fac0314SAndi Shyti pr_err("class_create failed\n"); 81654fcecafSAndi Shyti return PTR_ERR(lirc_class); 81732cf86f6SMauro Carvalho Chehab } 81832cf86f6SMauro Carvalho Chehab 819a6ddd4feSSean Young retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, 820463015ddSDavid Härdeman "BaseRemoteCtl"); 82132cf86f6SMauro Carvalho Chehab if (retval) { 82232cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 8233fac0314SAndi Shyti pr_err("alloc_chrdev_region failed\n"); 82454fcecafSAndi Shyti return retval; 82532cf86f6SMauro Carvalho Chehab } 82632cf86f6SMauro Carvalho Chehab 8275817b3d1SSean Young pr_debug("IR Remote Control driver registered, major %d\n", 8283fac0314SAndi Shyti MAJOR(lirc_base_dev)); 82932cf86f6SMauro Carvalho Chehab 83054fcecafSAndi Shyti return 0; 83132cf86f6SMauro Carvalho Chehab } 83232cf86f6SMauro Carvalho Chehab 833a60d64b1SSean Young void __exit lirc_dev_exit(void) 83432cf86f6SMauro Carvalho Chehab { 83532cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 836a6ddd4feSSean Young unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX); 83732cf86f6SMauro Carvalho Chehab } 83832cf86f6SMauro Carvalho Chehab 839f4364dcfSSean Young struct rc_dev *rc_dev_get_from_fd(int fd) 840f4364dcfSSean Young { 841f4364dcfSSean Young struct fd f = fdget(fd); 842f4364dcfSSean Young struct lirc_fh *fh; 843f4364dcfSSean Young struct rc_dev *dev; 844f4364dcfSSean Young 845f4364dcfSSean Young if (!f.file) 846f4364dcfSSean Young return ERR_PTR(-EBADF); 847f4364dcfSSean Young 848f4364dcfSSean Young if (f.file->f_op != &lirc_fops) { 849f4364dcfSSean Young fdput(f); 850f4364dcfSSean Young return ERR_PTR(-EINVAL); 851f4364dcfSSean Young } 852f4364dcfSSean Young 853f4364dcfSSean Young fh = f.file->private_data; 854f4364dcfSSean Young dev = fh->rc; 855f4364dcfSSean Young 856f4364dcfSSean Young get_device(&dev->dev); 857f4364dcfSSean Young fdput(f); 858f4364dcfSSean Young 859f4364dcfSSean Young return dev; 860f4364dcfSSean Young } 861f4364dcfSSean Young 86204d0e8deSSean Young MODULE_ALIAS("lirc_dev"); 863