132cf86f6SMauro Carvalho Chehab /* 232cf86f6SMauro Carvalho Chehab * LIRC base driver 332cf86f6SMauro Carvalho Chehab * 432cf86f6SMauro Carvalho Chehab * by Artur Lipowski <alipowski@interia.pl> 532cf86f6SMauro Carvalho Chehab * 632cf86f6SMauro Carvalho Chehab * This program is free software; you can redistribute it and/or modify 732cf86f6SMauro Carvalho Chehab * it under the terms of the GNU General Public License as published by 832cf86f6SMauro Carvalho Chehab * the Free Software Foundation; either version 2 of the License, or 932cf86f6SMauro Carvalho Chehab * (at your option) any later version. 1032cf86f6SMauro Carvalho Chehab * 1132cf86f6SMauro Carvalho Chehab * This program is distributed in the hope that it will be useful, 1232cf86f6SMauro Carvalho Chehab * but WITHOUT ANY WARRANTY; without even the implied warranty of 1332cf86f6SMauro Carvalho Chehab * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1432cf86f6SMauro Carvalho Chehab * GNU General Public License for more details. 1532cf86f6SMauro Carvalho Chehab * 1632cf86f6SMauro Carvalho Chehab */ 1732cf86f6SMauro Carvalho Chehab 183fac0314SAndi Shyti #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 193fac0314SAndi Shyti 2032cf86f6SMauro Carvalho Chehab #include <linux/module.h> 21174cd4b1SIngo Molnar #include <linux/sched/signal.h> 2232cf86f6SMauro Carvalho Chehab #include <linux/ioctl.h> 2332cf86f6SMauro Carvalho Chehab #include <linux/poll.h> 2432cf86f6SMauro Carvalho Chehab #include <linux/mutex.h> 2532cf86f6SMauro Carvalho Chehab #include <linux/device.h> 2632cf86f6SMauro Carvalho Chehab #include <linux/cdev.h> 2732cf86f6SMauro Carvalho Chehab 28ca7a722dSSrinivas Kandagatla #include <media/rc-core.h> 2932cf86f6SMauro Carvalho Chehab #include <media/lirc.h> 3032cf86f6SMauro Carvalho Chehab #include <media/lirc_dev.h> 3132cf86f6SMauro Carvalho Chehab 3232cf86f6SMauro Carvalho Chehab #define LOGHEAD "lirc_dev (%s[%d]): " 3332cf86f6SMauro Carvalho Chehab 3432cf86f6SMauro Carvalho Chehab static dev_t lirc_base_dev; 3532cf86f6SMauro Carvalho Chehab 3632cf86f6SMauro Carvalho Chehab struct irctl { 3732cf86f6SMauro Carvalho Chehab struct lirc_driver d; 383bce5572SDavid Härdeman bool attached; 3932cf86f6SMauro Carvalho Chehab int open; 4032cf86f6SMauro Carvalho Chehab 4132cf86f6SMauro Carvalho Chehab struct mutex irctl_lock; 4232cf86f6SMauro Carvalho Chehab struct lirc_buffer *buf; 430f7c4063SDavid Härdeman bool buf_internal; 4432cf86f6SMauro Carvalho Chehab 4574c839b2SSean Young struct device dev; 4674c839b2SSean Young struct cdev cdev; 4732cf86f6SMauro Carvalho Chehab }; 4832cf86f6SMauro Carvalho Chehab 4932cf86f6SMauro Carvalho Chehab static DEFINE_MUTEX(lirc_dev_lock); 5032cf86f6SMauro Carvalho Chehab 5132cf86f6SMauro Carvalho Chehab static struct irctl *irctls[MAX_IRCTL_DEVICES]; 5232cf86f6SMauro Carvalho Chehab 5332cf86f6SMauro Carvalho Chehab /* Only used for sysfs but defined to void otherwise */ 5432cf86f6SMauro Carvalho Chehab static struct class *lirc_class; 5532cf86f6SMauro Carvalho Chehab 5674c839b2SSean Young static void lirc_release(struct device *ld) 5732cf86f6SMauro Carvalho Chehab { 5874c839b2SSean Young struct irctl *ir = container_of(ld, struct irctl, dev); 5974c839b2SSean Young 60a607f51eSSean Young put_device(ir->dev.parent); 61a607f51eSSean Young 620f7c4063SDavid Härdeman if (ir->buf_internal) { 6332cf86f6SMauro Carvalho Chehab lirc_buffer_free(ir->buf); 6432cf86f6SMauro Carvalho Chehab kfree(ir->buf); 6532cf86f6SMauro Carvalho Chehab } 6674c839b2SSean Young 6774c839b2SSean Young mutex_lock(&lirc_dev_lock); 6874c839b2SSean Young irctls[ir->d.minor] = NULL; 6974c839b2SSean Young mutex_unlock(&lirc_dev_lock); 7074c839b2SSean Young kfree(ir); 7132cf86f6SMauro Carvalho Chehab } 7232cf86f6SMauro Carvalho Chehab 736fa99e1aSAndi Shyti static int lirc_allocate_buffer(struct irctl *ir) 746fa99e1aSAndi Shyti { 7570143984SAndi Shyti int err = 0; 766fa99e1aSAndi Shyti struct lirc_driver *d = &ir->d; 776fa99e1aSAndi Shyti 786fa99e1aSAndi Shyti if (d->rbuf) { 796fa99e1aSAndi Shyti ir->buf = d->rbuf; 800f7c4063SDavid Härdeman ir->buf_internal = false; 816fa99e1aSAndi Shyti } else { 826fa99e1aSAndi Shyti ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); 8370143984SAndi Shyti if (!ir->buf) { 8470143984SAndi Shyti err = -ENOMEM; 8570143984SAndi Shyti goto out; 8670143984SAndi Shyti } 876fa99e1aSAndi Shyti 88b145ef94SDavid Härdeman err = lirc_buffer_init(ir->buf, d->chunk_size, d->buffer_size); 896fa99e1aSAndi Shyti if (err) { 906fa99e1aSAndi Shyti kfree(ir->buf); 910f7c4063SDavid Härdeman ir->buf = NULL; 9270143984SAndi Shyti goto out; 936fa99e1aSAndi Shyti } 940f7c4063SDavid Härdeman 950f7c4063SDavid Härdeman ir->buf_internal = true; 9656481f00SDavid Härdeman d->rbuf = ir->buf; 976fa99e1aSAndi Shyti } 986fa99e1aSAndi Shyti 9970143984SAndi Shyti out: 10070143984SAndi Shyti return err; 1016fa99e1aSAndi Shyti } 1026fa99e1aSAndi Shyti 10356481f00SDavid Härdeman int lirc_register_driver(struct lirc_driver *d) 10432cf86f6SMauro Carvalho Chehab { 10532cf86f6SMauro Carvalho Chehab struct irctl *ir; 106c3c6dd75SDavid Härdeman unsigned int minor; 10732cf86f6SMauro Carvalho Chehab int err; 10832cf86f6SMauro Carvalho Chehab 10932cf86f6SMauro Carvalho Chehab if (!d) { 1103fac0314SAndi Shyti pr_err("driver pointer must be not NULL!\n"); 11154fcecafSAndi Shyti return -EBADRQC; 11232cf86f6SMauro Carvalho Chehab } 11332cf86f6SMauro Carvalho Chehab 11432cf86f6SMauro Carvalho Chehab if (!d->dev) { 1153fac0314SAndi Shyti pr_err("dev pointer not filled in!\n"); 11654fcecafSAndi Shyti return -EINVAL; 11732cf86f6SMauro Carvalho Chehab } 11832cf86f6SMauro Carvalho Chehab 119712551f0SDavid Härdeman if (!d->fops) { 120712551f0SDavid Härdeman pr_err("fops pointer not filled in!\n"); 121712551f0SDavid Härdeman return -EINVAL; 122712551f0SDavid Härdeman } 123712551f0SDavid Härdeman 124b145ef94SDavid Härdeman if (!d->rbuf && d->chunk_size < 1) { 125b145ef94SDavid Härdeman pr_err("chunk_size must be set!\n"); 126b145ef94SDavid Härdeman return -EINVAL; 127b145ef94SDavid Härdeman } 128b145ef94SDavid Härdeman 129b145ef94SDavid Härdeman if (!d->rbuf && d->buffer_size < 1) { 130b145ef94SDavid Härdeman pr_err("buffer_size must be set!\n"); 131b145ef94SDavid Härdeman return -EINVAL; 132b145ef94SDavid Härdeman } 133b145ef94SDavid Härdeman 1349675ee5aSAndi Shyti if (d->code_length < 1 || d->code_length > (BUFLEN * 8)) { 1353fac0314SAndi Shyti dev_err(d->dev, "code length must be less than %d bits\n", 1363fac0314SAndi Shyti BUFLEN * 8); 13754fcecafSAndi Shyti return -EBADRQC; 13832cf86f6SMauro Carvalho Chehab } 13932cf86f6SMauro Carvalho Chehab 140c3104e1bSDavid Härdeman if (!d->rbuf && !(d->fops && d->fops->read && 14114db9fc2SAndi Shyti d->fops->poll && d->fops->unlocked_ioctl)) { 1423fac0314SAndi Shyti dev_err(d->dev, "undefined read, poll, ioctl\n"); 14354fcecafSAndi Shyti return -EBADRQC; 14432cf86f6SMauro Carvalho Chehab } 14532cf86f6SMauro Carvalho Chehab 14632cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 14732cf86f6SMauro Carvalho Chehab 14832cf86f6SMauro Carvalho Chehab /* find first free slot for driver */ 14932cf86f6SMauro Carvalho Chehab for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) 15032cf86f6SMauro Carvalho Chehab if (!irctls[minor]) 15132cf86f6SMauro Carvalho Chehab break; 152c3c6dd75SDavid Härdeman 1539675ee5aSAndi Shyti if (minor == MAX_IRCTL_DEVICES) { 1543fac0314SAndi Shyti dev_err(d->dev, "no free slots for drivers!\n"); 15532cf86f6SMauro Carvalho Chehab err = -ENOMEM; 15632cf86f6SMauro Carvalho Chehab goto out_lock; 15732cf86f6SMauro Carvalho Chehab } 15832cf86f6SMauro Carvalho Chehab 15932cf86f6SMauro Carvalho Chehab ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); 16032cf86f6SMauro Carvalho Chehab if (!ir) { 16132cf86f6SMauro Carvalho Chehab err = -ENOMEM; 16232cf86f6SMauro Carvalho Chehab goto out_lock; 16332cf86f6SMauro Carvalho Chehab } 164712551f0SDavid Härdeman 165712551f0SDavid Härdeman mutex_init(&ir->irctl_lock); 16632cf86f6SMauro Carvalho Chehab irctls[minor] = ir; 167c3c6dd75SDavid Härdeman d->irctl = ir; 16832cf86f6SMauro Carvalho Chehab d->minor = minor; 16932cf86f6SMauro Carvalho Chehab 17032cf86f6SMauro Carvalho Chehab /* some safety check 8-) */ 17132cf86f6SMauro Carvalho Chehab d->name[sizeof(d->name)-1] = '\0'; 17232cf86f6SMauro Carvalho Chehab 17332cf86f6SMauro Carvalho Chehab if (d->features == 0) 17432cf86f6SMauro Carvalho Chehab d->features = LIRC_CAN_REC_LIRCCODE; 17532cf86f6SMauro Carvalho Chehab 17632cf86f6SMauro Carvalho Chehab ir->d = *d; 17732cf86f6SMauro Carvalho Chehab 17856481f00SDavid Härdeman if (LIRC_CAN_REC(d->features)) { 17956481f00SDavid Härdeman err = lirc_allocate_buffer(irctls[minor]); 18056481f00SDavid Härdeman if (err) { 18156481f00SDavid Härdeman kfree(ir); 18256481f00SDavid Härdeman goto out_lock; 18356481f00SDavid Härdeman } 18456481f00SDavid Härdeman d->rbuf = ir->buf; 18556481f00SDavid Härdeman } 18656481f00SDavid Härdeman 18725823226SDavid Härdeman device_initialize(&ir->dev); 18874c839b2SSean Young ir->dev.devt = MKDEV(MAJOR(lirc_base_dev), ir->d.minor); 18974c839b2SSean Young ir->dev.class = lirc_class; 19074c839b2SSean Young ir->dev.parent = d->dev; 19174c839b2SSean Young ir->dev.release = lirc_release; 19274c839b2SSean Young dev_set_name(&ir->dev, "lirc%d", ir->d.minor); 19332cf86f6SMauro Carvalho Chehab 194712551f0SDavid Härdeman cdev_init(&ir->cdev, d->fops); 195712551f0SDavid Härdeman ir->cdev.owner = ir->d.owner; 1963bce5572SDavid Härdeman ir->attached = true; 19774c839b2SSean Young 1980510d810SDavid Härdeman err = cdev_device_add(&ir->cdev, &ir->dev); 19974c839b2SSean Young if (err) 2000510d810SDavid Härdeman goto out_dev; 20174c839b2SSean Young 20232cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 20332cf86f6SMauro Carvalho Chehab 204a607f51eSSean Young get_device(ir->dev.parent); 205a607f51eSSean Young 20632cf86f6SMauro Carvalho Chehab dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", 20732cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 20856481f00SDavid Härdeman 209c3c6dd75SDavid Härdeman return 0; 21056481f00SDavid Härdeman 2110510d810SDavid Härdeman out_dev: 21274c839b2SSean Young put_device(&ir->dev); 21332cf86f6SMauro Carvalho Chehab out_lock: 21432cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 21554fcecafSAndi Shyti 21632cf86f6SMauro Carvalho Chehab return err; 21732cf86f6SMauro Carvalho Chehab } 21832cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_register_driver); 21932cf86f6SMauro Carvalho Chehab 220c3c6dd75SDavid Härdeman void lirc_unregister_driver(struct lirc_driver *d) 22132cf86f6SMauro Carvalho Chehab { 22232cf86f6SMauro Carvalho Chehab struct irctl *ir; 22332cf86f6SMauro Carvalho Chehab 224c3c6dd75SDavid Härdeman if (!d || !d->irctl) 225c3c6dd75SDavid Härdeman return; 22632cf86f6SMauro Carvalho Chehab 227c3c6dd75SDavid Härdeman ir = d->irctl; 22832cf86f6SMauro Carvalho Chehab 22932cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 23032cf86f6SMauro Carvalho Chehab 23132cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", 232c3c6dd75SDavid Härdeman d->name, d->minor); 23332cf86f6SMauro Carvalho Chehab 2343bce5572SDavid Härdeman ir->attached = false; 23532cf86f6SMauro Carvalho Chehab if (ir->open) { 23632cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", 237c3c6dd75SDavid Härdeman d->name, d->minor); 23832cf86f6SMauro Carvalho Chehab wake_up_interruptible(&ir->buf->wait_poll); 23974c839b2SSean Young } 24074c839b2SSean Young 24132cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 24232cf86f6SMauro Carvalho Chehab 2430510d810SDavid Härdeman cdev_device_del(&ir->cdev, &ir->dev); 24474c839b2SSean Young put_device(&ir->dev); 24532cf86f6SMauro Carvalho Chehab } 24632cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_unregister_driver); 24732cf86f6SMauro Carvalho Chehab 24832cf86f6SMauro Carvalho Chehab int lirc_dev_fop_open(struct inode *inode, struct file *file) 24932cf86f6SMauro Carvalho Chehab { 250615cd3feSDavid Härdeman struct irctl *ir = container_of(inode->i_cdev, struct irctl, cdev); 251de226ec8SDavid Härdeman int retval; 25232cf86f6SMauro Carvalho Chehab 25332cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); 25432cf86f6SMauro Carvalho Chehab 255615cd3feSDavid Härdeman if (ir->open) 256615cd3feSDavid Härdeman return -EBUSY; 25732cf86f6SMauro Carvalho Chehab 258ca7a722dSSrinivas Kandagatla if (ir->d.rdev) { 259ca7a722dSSrinivas Kandagatla retval = rc_open(ir->d.rdev); 260ca7a722dSSrinivas Kandagatla if (retval) 261615cd3feSDavid Härdeman return retval; 262ca7a722dSSrinivas Kandagatla } 263ca7a722dSSrinivas Kandagatla 26474c839b2SSean Young if (ir->buf) 26532cf86f6SMauro Carvalho Chehab lirc_buffer_clear(ir->buf); 2662c5a1f44SDavid Härdeman 2672c5a1f44SDavid Härdeman ir->open++; 26832cf86f6SMauro Carvalho Chehab 269615cd3feSDavid Härdeman lirc_init_pdata(inode, file); 27032cf86f6SMauro Carvalho Chehab nonseekable_open(inode, file); 27132cf86f6SMauro Carvalho Chehab 272de226ec8SDavid Härdeman return 0; 27332cf86f6SMauro Carvalho Chehab } 27432cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_open); 27532cf86f6SMauro Carvalho Chehab 27632cf86f6SMauro Carvalho Chehab int lirc_dev_fop_close(struct inode *inode, struct file *file) 27732cf86f6SMauro Carvalho Chehab { 278615cd3feSDavid Härdeman struct irctl *ir = file->private_data; 279b64e10f3SMauro Carvalho Chehab int ret; 28032cf86f6SMauro Carvalho Chehab 281b64e10f3SMauro Carvalho Chehab ret = mutex_lock_killable(&lirc_dev_lock); 282b64e10f3SMauro Carvalho Chehab WARN_ON(ret); 28332cf86f6SMauro Carvalho Chehab 284ca7a722dSSrinivas Kandagatla rc_close(ir->d.rdev); 285ca7a722dSSrinivas Kandagatla 28632cf86f6SMauro Carvalho Chehab ir->open--; 287b64e10f3SMauro Carvalho Chehab if (!ret) 28832cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 28932cf86f6SMauro Carvalho Chehab 29032cf86f6SMauro Carvalho Chehab return 0; 29132cf86f6SMauro Carvalho Chehab } 29232cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_close); 29332cf86f6SMauro Carvalho Chehab 29432cf86f6SMauro Carvalho Chehab unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) 29532cf86f6SMauro Carvalho Chehab { 296615cd3feSDavid Härdeman struct irctl *ir = file->private_data; 29732cf86f6SMauro Carvalho Chehab unsigned int ret; 29832cf86f6SMauro Carvalho Chehab 29932cf86f6SMauro Carvalho Chehab if (!ir->attached) 30029debf3dSDavid Härdeman return POLLHUP | POLLERR; 30132cf86f6SMauro Carvalho Chehab 3023656cdddSAndy Shevchenko if (ir->buf) { 30332cf86f6SMauro Carvalho Chehab poll_wait(file, &ir->buf->wait_poll, wait); 30432cf86f6SMauro Carvalho Chehab 30532cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) 30632cf86f6SMauro Carvalho Chehab ret = 0; 30732cf86f6SMauro Carvalho Chehab else 30832cf86f6SMauro Carvalho Chehab ret = POLLIN | POLLRDNORM; 3093656cdddSAndy Shevchenko } else 31032cf86f6SMauro Carvalho Chehab ret = POLLERR; 31132cf86f6SMauro Carvalho Chehab 31232cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", 31332cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, ret); 31432cf86f6SMauro Carvalho Chehab 31532cf86f6SMauro Carvalho Chehab return ret; 31632cf86f6SMauro Carvalho Chehab } 31732cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_poll); 31832cf86f6SMauro Carvalho Chehab 31932cf86f6SMauro Carvalho Chehab long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 32032cf86f6SMauro Carvalho Chehab { 321615cd3feSDavid Härdeman struct irctl *ir = file->private_data; 32232cf86f6SMauro Carvalho Chehab __u32 mode; 32332cf86f6SMauro Carvalho Chehab int result = 0; 32432cf86f6SMauro Carvalho Chehab 32532cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", 32632cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, cmd); 32732cf86f6SMauro Carvalho Chehab 328c3c6dd75SDavid Härdeman if (!ir->attached) { 3293fac0314SAndi Shyti dev_err(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", 33032cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 33132cf86f6SMauro Carvalho Chehab return -ENODEV; 33232cf86f6SMauro Carvalho Chehab } 33332cf86f6SMauro Carvalho Chehab 33432cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 33532cf86f6SMauro Carvalho Chehab 33632cf86f6SMauro Carvalho Chehab switch (cmd) { 33732cf86f6SMauro Carvalho Chehab case LIRC_GET_FEATURES: 33860519af3SHans Verkuil result = put_user(ir->d.features, (__u32 __user *)arg); 33932cf86f6SMauro Carvalho Chehab break; 34032cf86f6SMauro Carvalho Chehab case LIRC_GET_REC_MODE: 341bd291208SSean Young if (!LIRC_CAN_REC(ir->d.features)) { 342b4088094SAndi Shyti result = -ENOTTY; 34332cf86f6SMauro Carvalho Chehab break; 34432cf86f6SMauro Carvalho Chehab } 34532cf86f6SMauro Carvalho Chehab 34632cf86f6SMauro Carvalho Chehab result = put_user(LIRC_REC2MODE 34732cf86f6SMauro Carvalho Chehab (ir->d.features & LIRC_CAN_REC_MASK), 34860519af3SHans Verkuil (__u32 __user *)arg); 34932cf86f6SMauro Carvalho Chehab break; 35032cf86f6SMauro Carvalho Chehab case LIRC_SET_REC_MODE: 351bd291208SSean Young if (!LIRC_CAN_REC(ir->d.features)) { 352b4088094SAndi Shyti result = -ENOTTY; 35332cf86f6SMauro Carvalho Chehab break; 35432cf86f6SMauro Carvalho Chehab } 35532cf86f6SMauro Carvalho Chehab 35660519af3SHans Verkuil result = get_user(mode, (__u32 __user *)arg); 35732cf86f6SMauro Carvalho Chehab if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) 35832cf86f6SMauro Carvalho Chehab result = -EINVAL; 35932cf86f6SMauro Carvalho Chehab /* 36032cf86f6SMauro Carvalho Chehab * FIXME: We should actually set the mode somehow but 36132cf86f6SMauro Carvalho Chehab * for now, lirc_serial doesn't support mode changing either 36232cf86f6SMauro Carvalho Chehab */ 36332cf86f6SMauro Carvalho Chehab break; 36432cf86f6SMauro Carvalho Chehab case LIRC_GET_LENGTH: 36560519af3SHans Verkuil result = put_user(ir->d.code_length, (__u32 __user *)arg); 36632cf86f6SMauro Carvalho Chehab break; 36732cf86f6SMauro Carvalho Chehab case LIRC_GET_MIN_TIMEOUT: 36832cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 36932cf86f6SMauro Carvalho Chehab ir->d.min_timeout == 0) { 370b4088094SAndi Shyti result = -ENOTTY; 37132cf86f6SMauro Carvalho Chehab break; 37232cf86f6SMauro Carvalho Chehab } 37332cf86f6SMauro Carvalho Chehab 37460519af3SHans Verkuil result = put_user(ir->d.min_timeout, (__u32 __user *)arg); 37532cf86f6SMauro Carvalho Chehab break; 37632cf86f6SMauro Carvalho Chehab case LIRC_GET_MAX_TIMEOUT: 37732cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 37832cf86f6SMauro Carvalho Chehab ir->d.max_timeout == 0) { 379b4088094SAndi Shyti result = -ENOTTY; 38032cf86f6SMauro Carvalho Chehab break; 38132cf86f6SMauro Carvalho Chehab } 38232cf86f6SMauro Carvalho Chehab 38360519af3SHans Verkuil result = put_user(ir->d.max_timeout, (__u32 __user *)arg); 38432cf86f6SMauro Carvalho Chehab break; 38532cf86f6SMauro Carvalho Chehab default: 3865c862758SSean Young result = -ENOTTY; 38732cf86f6SMauro Carvalho Chehab } 38832cf86f6SMauro Carvalho Chehab 38932cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 39032cf86f6SMauro Carvalho Chehab 39132cf86f6SMauro Carvalho Chehab return result; 39232cf86f6SMauro Carvalho Chehab } 39332cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_ioctl); 39432cf86f6SMauro Carvalho Chehab 39532cf86f6SMauro Carvalho Chehab ssize_t lirc_dev_fop_read(struct file *file, 3960e835087SDan Carpenter char __user *buffer, 39732cf86f6SMauro Carvalho Chehab size_t length, 39832cf86f6SMauro Carvalho Chehab loff_t *ppos) 39932cf86f6SMauro Carvalho Chehab { 400615cd3feSDavid Härdeman struct irctl *ir = file->private_data; 40132cf86f6SMauro Carvalho Chehab unsigned char *buf; 40232cf86f6SMauro Carvalho Chehab int ret = 0, written = 0; 40332cf86f6SMauro Carvalho Chehab DECLARE_WAITQUEUE(wait, current); 40432cf86f6SMauro Carvalho Chehab 40532002f72SSean Young if (!LIRC_CAN_REC(ir->d.features)) 40632002f72SSean Young return -EINVAL; 40732002f72SSean Young 40832cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); 40932cf86f6SMauro Carvalho Chehab 410b145ef94SDavid Härdeman buf = kzalloc(ir->buf->chunk_size, GFP_KERNEL); 41132cf86f6SMauro Carvalho Chehab if (!buf) 41232cf86f6SMauro Carvalho Chehab return -ENOMEM; 41332cf86f6SMauro Carvalho Chehab 41432cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 41532cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 41632cf86f6SMauro Carvalho Chehab goto out_unlocked; 41732cf86f6SMauro Carvalho Chehab } 41832cf86f6SMauro Carvalho Chehab if (!ir->attached) { 41932cf86f6SMauro Carvalho Chehab ret = -ENODEV; 42032cf86f6SMauro Carvalho Chehab goto out_locked; 42132cf86f6SMauro Carvalho Chehab } 42232cf86f6SMauro Carvalho Chehab 423b145ef94SDavid Härdeman if (length % ir->buf->chunk_size) { 42432cf86f6SMauro Carvalho Chehab ret = -EINVAL; 42532cf86f6SMauro Carvalho Chehab goto out_locked; 42632cf86f6SMauro Carvalho Chehab } 42732cf86f6SMauro Carvalho Chehab 42832cf86f6SMauro Carvalho Chehab /* 42932cf86f6SMauro Carvalho Chehab * we add ourselves to the task queue before buffer check 43032cf86f6SMauro Carvalho Chehab * to avoid losing scan code (in case when queue is awaken somewhere 43132cf86f6SMauro Carvalho Chehab * between while condition checking and scheduling) 43232cf86f6SMauro Carvalho Chehab */ 43332cf86f6SMauro Carvalho Chehab add_wait_queue(&ir->buf->wait_poll, &wait); 43432cf86f6SMauro Carvalho Chehab 43532cf86f6SMauro Carvalho Chehab /* 43632cf86f6SMauro Carvalho Chehab * while we didn't provide 'length' bytes, device is opened in blocking 43732cf86f6SMauro Carvalho Chehab * mode and 'copy_to_user' is happy, wait for data. 43832cf86f6SMauro Carvalho Chehab */ 43932cf86f6SMauro Carvalho Chehab while (written < length && ret == 0) { 44032cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) { 44132cf86f6SMauro Carvalho Chehab /* According to the read(2) man page, 'written' can be 44232cf86f6SMauro Carvalho Chehab * returned as less than 'length', instead of blocking 44332cf86f6SMauro Carvalho Chehab * again, returning -EWOULDBLOCK, or returning 44462e92682SAndi Shyti * -ERESTARTSYS 44562e92682SAndi Shyti */ 44632cf86f6SMauro Carvalho Chehab if (written) 44732cf86f6SMauro Carvalho Chehab break; 44832cf86f6SMauro Carvalho Chehab if (file->f_flags & O_NONBLOCK) { 44932cf86f6SMauro Carvalho Chehab ret = -EWOULDBLOCK; 45032cf86f6SMauro Carvalho Chehab break; 45132cf86f6SMauro Carvalho Chehab } 45232cf86f6SMauro Carvalho Chehab if (signal_pending(current)) { 45332cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 45432cf86f6SMauro Carvalho Chehab break; 45532cf86f6SMauro Carvalho Chehab } 45632cf86f6SMauro Carvalho Chehab 45732cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 45832cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 45912accdcbSSean Young schedule(); 46012accdcbSSean Young set_current_state(TASK_RUNNING); 46132cf86f6SMauro Carvalho Chehab 46232cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 46332cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 46432cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 46532cf86f6SMauro Carvalho Chehab goto out_unlocked; 46632cf86f6SMauro Carvalho Chehab } 46732cf86f6SMauro Carvalho Chehab 46832cf86f6SMauro Carvalho Chehab if (!ir->attached) { 46932cf86f6SMauro Carvalho Chehab ret = -ENODEV; 470c77d17c0SSean Young goto out_locked; 47132cf86f6SMauro Carvalho Chehab } 47232cf86f6SMauro Carvalho Chehab } else { 47332cf86f6SMauro Carvalho Chehab lirc_buffer_read(ir->buf, buf); 47460519af3SHans Verkuil ret = copy_to_user((void __user *)buffer+written, buf, 47532cf86f6SMauro Carvalho Chehab ir->buf->chunk_size); 47632cf86f6SMauro Carvalho Chehab if (!ret) 47732cf86f6SMauro Carvalho Chehab written += ir->buf->chunk_size; 47832cf86f6SMauro Carvalho Chehab else 47932cf86f6SMauro Carvalho Chehab ret = -EFAULT; 48032cf86f6SMauro Carvalho Chehab } 48132cf86f6SMauro Carvalho Chehab } 48232cf86f6SMauro Carvalho Chehab 48332cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 48432cf86f6SMauro Carvalho Chehab 48532cf86f6SMauro Carvalho Chehab out_locked: 48632cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 48732cf86f6SMauro Carvalho Chehab 48832cf86f6SMauro Carvalho Chehab out_unlocked: 48932cf86f6SMauro Carvalho Chehab kfree(buf); 49032cf86f6SMauro Carvalho Chehab 49132cf86f6SMauro Carvalho Chehab return ret ? ret : written; 49232cf86f6SMauro Carvalho Chehab } 49332cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_read); 49432cf86f6SMauro Carvalho Chehab 495615cd3feSDavid Härdeman void lirc_init_pdata(struct inode *inode, struct file *file) 496615cd3feSDavid Härdeman { 497615cd3feSDavid Härdeman struct irctl *ir = container_of(inode->i_cdev, struct irctl, cdev); 498615cd3feSDavid Härdeman 499615cd3feSDavid Härdeman file->private_data = ir; 500615cd3feSDavid Härdeman } 501615cd3feSDavid Härdeman EXPORT_SYMBOL(lirc_init_pdata); 502615cd3feSDavid Härdeman 50332cf86f6SMauro Carvalho Chehab void *lirc_get_pdata(struct file *file) 50432cf86f6SMauro Carvalho Chehab { 505615cd3feSDavid Härdeman struct irctl *ir = file->private_data; 506615cd3feSDavid Härdeman 507615cd3feSDavid Härdeman return ir->d.data; 50832cf86f6SMauro Carvalho Chehab } 50932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_get_pdata); 51032cf86f6SMauro Carvalho Chehab 51132cf86f6SMauro Carvalho Chehab 51232cf86f6SMauro Carvalho Chehab static int __init lirc_dev_init(void) 51332cf86f6SMauro Carvalho Chehab { 51432cf86f6SMauro Carvalho Chehab int retval; 51532cf86f6SMauro Carvalho Chehab 51632cf86f6SMauro Carvalho Chehab lirc_class = class_create(THIS_MODULE, "lirc"); 51732cf86f6SMauro Carvalho Chehab if (IS_ERR(lirc_class)) { 5183fac0314SAndi Shyti pr_err("class_create failed\n"); 51954fcecafSAndi Shyti return PTR_ERR(lirc_class); 52032cf86f6SMauro Carvalho Chehab } 52132cf86f6SMauro Carvalho Chehab 52232cf86f6SMauro Carvalho Chehab retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, 523463015ddSDavid Härdeman "BaseRemoteCtl"); 52432cf86f6SMauro Carvalho Chehab if (retval) { 52532cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 5263fac0314SAndi Shyti pr_err("alloc_chrdev_region failed\n"); 52754fcecafSAndi Shyti return retval; 52832cf86f6SMauro Carvalho Chehab } 52932cf86f6SMauro Carvalho Chehab 5303fac0314SAndi Shyti pr_info("IR Remote Control driver registered, major %d\n", 5313fac0314SAndi Shyti MAJOR(lirc_base_dev)); 53232cf86f6SMauro Carvalho Chehab 53354fcecafSAndi Shyti return 0; 53432cf86f6SMauro Carvalho Chehab } 53532cf86f6SMauro Carvalho Chehab 53632cf86f6SMauro Carvalho Chehab static void __exit lirc_dev_exit(void) 53732cf86f6SMauro Carvalho Chehab { 53832cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 53932cf86f6SMauro Carvalho Chehab unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); 5403fac0314SAndi Shyti pr_info("module unloaded\n"); 54132cf86f6SMauro Carvalho Chehab } 54232cf86f6SMauro Carvalho Chehab 54332cf86f6SMauro Carvalho Chehab module_init(lirc_dev_init); 54432cf86f6SMauro Carvalho Chehab module_exit(lirc_dev_exit); 54532cf86f6SMauro Carvalho Chehab 54632cf86f6SMauro Carvalho Chehab MODULE_DESCRIPTION("LIRC base driver module"); 54732cf86f6SMauro Carvalho Chehab MODULE_AUTHOR("Artur Lipowski"); 54832cf86f6SMauro Carvalho Chehab MODULE_LICENSE("GPL"); 549