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; 3832cf86f6SMauro Carvalho Chehab int 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 unsigned int chunk_size; 4532cf86f6SMauro Carvalho Chehab 4674c839b2SSean Young struct device dev; 4774c839b2SSean Young struct cdev cdev; 4832cf86f6SMauro Carvalho Chehab }; 4932cf86f6SMauro Carvalho Chehab 5032cf86f6SMauro Carvalho Chehab static DEFINE_MUTEX(lirc_dev_lock); 5132cf86f6SMauro Carvalho Chehab 5232cf86f6SMauro Carvalho Chehab static struct irctl *irctls[MAX_IRCTL_DEVICES]; 5332cf86f6SMauro Carvalho Chehab 5432cf86f6SMauro Carvalho Chehab /* Only used for sysfs but defined to void otherwise */ 5532cf86f6SMauro Carvalho Chehab static struct class *lirc_class; 5632cf86f6SMauro Carvalho Chehab 5774c839b2SSean Young static void lirc_release(struct device *ld) 5832cf86f6SMauro Carvalho Chehab { 5974c839b2SSean Young struct irctl *ir = container_of(ld, struct irctl, dev); 6074c839b2SSean Young 61a607f51eSSean Young put_device(ir->dev.parent); 62a607f51eSSean Young 630f7c4063SDavid Härdeman if (ir->buf_internal) { 6432cf86f6SMauro Carvalho Chehab lirc_buffer_free(ir->buf); 6532cf86f6SMauro Carvalho Chehab kfree(ir->buf); 6632cf86f6SMauro Carvalho Chehab } 6774c839b2SSean Young 6874c839b2SSean Young mutex_lock(&lirc_dev_lock); 6974c839b2SSean Young irctls[ir->d.minor] = NULL; 7074c839b2SSean Young mutex_unlock(&lirc_dev_lock); 7174c839b2SSean Young kfree(ir); 7232cf86f6SMauro Carvalho Chehab } 7332cf86f6SMauro Carvalho Chehab 746fa99e1aSAndi Shyti static int lirc_allocate_buffer(struct irctl *ir) 756fa99e1aSAndi Shyti { 7670143984SAndi Shyti int err = 0; 776fa99e1aSAndi Shyti int bytes_in_key; 786fa99e1aSAndi Shyti unsigned int chunk_size; 796fa99e1aSAndi Shyti unsigned int buffer_size; 806fa99e1aSAndi Shyti struct lirc_driver *d = &ir->d; 816fa99e1aSAndi Shyti 826fa99e1aSAndi Shyti bytes_in_key = BITS_TO_LONGS(d->code_length) + 836fa99e1aSAndi Shyti (d->code_length % 8 ? 1 : 0); 846fa99e1aSAndi Shyti buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; 856fa99e1aSAndi Shyti chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; 866fa99e1aSAndi Shyti 876fa99e1aSAndi Shyti if (d->rbuf) { 886fa99e1aSAndi Shyti ir->buf = d->rbuf; 890f7c4063SDavid Härdeman ir->buf_internal = false; 906fa99e1aSAndi Shyti } else { 916fa99e1aSAndi Shyti ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); 9270143984SAndi Shyti if (!ir->buf) { 9370143984SAndi Shyti err = -ENOMEM; 9470143984SAndi Shyti goto out; 9570143984SAndi Shyti } 966fa99e1aSAndi Shyti 976fa99e1aSAndi Shyti err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); 986fa99e1aSAndi Shyti if (err) { 996fa99e1aSAndi Shyti kfree(ir->buf); 1000f7c4063SDavid Härdeman ir->buf = NULL; 10170143984SAndi Shyti goto out; 1026fa99e1aSAndi Shyti } 1030f7c4063SDavid Härdeman 1040f7c4063SDavid Härdeman ir->buf_internal = true; 10556481f00SDavid Härdeman d->rbuf = ir->buf; 1066fa99e1aSAndi Shyti } 1076fa99e1aSAndi Shyti ir->chunk_size = ir->buf->chunk_size; 1086fa99e1aSAndi Shyti 10970143984SAndi Shyti out: 11070143984SAndi Shyti return err; 1116fa99e1aSAndi Shyti } 1126fa99e1aSAndi Shyti 11356481f00SDavid Härdeman int lirc_register_driver(struct lirc_driver *d) 11432cf86f6SMauro Carvalho Chehab { 11532cf86f6SMauro Carvalho Chehab struct irctl *ir; 116c3c6dd75SDavid Härdeman unsigned int minor; 11732cf86f6SMauro Carvalho Chehab int err; 11832cf86f6SMauro Carvalho Chehab 11932cf86f6SMauro Carvalho Chehab if (!d) { 1203fac0314SAndi Shyti pr_err("driver pointer must be not NULL!\n"); 12154fcecafSAndi Shyti return -EBADRQC; 12232cf86f6SMauro Carvalho Chehab } 12332cf86f6SMauro Carvalho Chehab 12432cf86f6SMauro Carvalho Chehab if (!d->dev) { 1253fac0314SAndi Shyti pr_err("dev pointer not filled in!\n"); 12654fcecafSAndi Shyti return -EINVAL; 12732cf86f6SMauro Carvalho Chehab } 12832cf86f6SMauro Carvalho Chehab 129712551f0SDavid Härdeman if (!d->fops) { 130712551f0SDavid Härdeman pr_err("fops pointer not filled in!\n"); 131712551f0SDavid Härdeman return -EINVAL; 132712551f0SDavid Härdeman } 133712551f0SDavid 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; 19632cf86f6SMauro Carvalho Chehab ir->attached = 1; 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 23432cf86f6SMauro Carvalho Chehab ir->attached = 0; 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 { 25032cf86f6SMauro Carvalho Chehab struct irctl *ir; 251de226ec8SDavid Härdeman int retval; 25232cf86f6SMauro Carvalho Chehab 25332cf86f6SMauro Carvalho Chehab if (iminor(inode) >= MAX_IRCTL_DEVICES) { 2543fac0314SAndi Shyti pr_err("open result for %d is -ENODEV\n", iminor(inode)); 25532cf86f6SMauro Carvalho Chehab return -ENODEV; 25632cf86f6SMauro Carvalho Chehab } 25732cf86f6SMauro Carvalho Chehab 25832cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&lirc_dev_lock)) 25932cf86f6SMauro Carvalho Chehab return -ERESTARTSYS; 26032cf86f6SMauro Carvalho Chehab 26132cf86f6SMauro Carvalho Chehab ir = irctls[iminor(inode)]; 262db5b15b7SSean Young mutex_unlock(&lirc_dev_lock); 263db5b15b7SSean Young 26432cf86f6SMauro Carvalho Chehab if (!ir) { 26532cf86f6SMauro Carvalho Chehab retval = -ENODEV; 26632cf86f6SMauro Carvalho Chehab goto error; 26732cf86f6SMauro Carvalho Chehab } 26832cf86f6SMauro Carvalho Chehab 26932cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); 27032cf86f6SMauro Carvalho Chehab 27132cf86f6SMauro Carvalho Chehab if (ir->open) { 27232cf86f6SMauro Carvalho Chehab retval = -EBUSY; 27332cf86f6SMauro Carvalho Chehab goto error; 27432cf86f6SMauro Carvalho Chehab } 27532cf86f6SMauro Carvalho Chehab 276ca7a722dSSrinivas Kandagatla if (ir->d.rdev) { 277ca7a722dSSrinivas Kandagatla retval = rc_open(ir->d.rdev); 278ca7a722dSSrinivas Kandagatla if (retval) 279ca7a722dSSrinivas Kandagatla goto error; 280ca7a722dSSrinivas Kandagatla } 281ca7a722dSSrinivas Kandagatla 28274c839b2SSean Young if (ir->buf) 28332cf86f6SMauro Carvalho Chehab lirc_buffer_clear(ir->buf); 2842c5a1f44SDavid Härdeman 2852c5a1f44SDavid Härdeman ir->open++; 28632cf86f6SMauro Carvalho Chehab 28732cf86f6SMauro Carvalho Chehab nonseekable_open(inode, file); 28832cf86f6SMauro Carvalho Chehab 289de226ec8SDavid Härdeman return 0; 290de226ec8SDavid Härdeman 291de226ec8SDavid Härdeman error: 29232cf86f6SMauro Carvalho Chehab return retval; 29332cf86f6SMauro Carvalho Chehab } 29432cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_open); 29532cf86f6SMauro Carvalho Chehab 29632cf86f6SMauro Carvalho Chehab int lirc_dev_fop_close(struct inode *inode, struct file *file) 29732cf86f6SMauro Carvalho Chehab { 29832cf86f6SMauro Carvalho Chehab struct irctl *ir = irctls[iminor(inode)]; 299b64e10f3SMauro Carvalho Chehab int ret; 30032cf86f6SMauro Carvalho Chehab 30132cf86f6SMauro Carvalho Chehab if (!ir) { 3023fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 30332cf86f6SMauro Carvalho Chehab return -EINVAL; 30432cf86f6SMauro Carvalho Chehab } 30532cf86f6SMauro Carvalho Chehab 306b64e10f3SMauro Carvalho Chehab ret = mutex_lock_killable(&lirc_dev_lock); 307b64e10f3SMauro Carvalho Chehab WARN_ON(ret); 30832cf86f6SMauro Carvalho Chehab 309ca7a722dSSrinivas Kandagatla rc_close(ir->d.rdev); 310ca7a722dSSrinivas Kandagatla 31132cf86f6SMauro Carvalho Chehab ir->open--; 312b64e10f3SMauro Carvalho Chehab if (!ret) 31332cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 31432cf86f6SMauro Carvalho Chehab 31532cf86f6SMauro Carvalho Chehab return 0; 31632cf86f6SMauro Carvalho Chehab } 31732cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_close); 31832cf86f6SMauro Carvalho Chehab 31932cf86f6SMauro Carvalho Chehab unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) 32032cf86f6SMauro Carvalho Chehab { 321496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 32232cf86f6SMauro Carvalho Chehab unsigned int ret; 32332cf86f6SMauro Carvalho Chehab 32432cf86f6SMauro Carvalho Chehab if (!ir) { 3253fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 32632cf86f6SMauro Carvalho Chehab return POLLERR; 32732cf86f6SMauro Carvalho Chehab } 32832cf86f6SMauro Carvalho Chehab 32932cf86f6SMauro Carvalho Chehab if (!ir->attached) 33029debf3dSDavid Härdeman return POLLHUP | POLLERR; 33132cf86f6SMauro Carvalho Chehab 3323656cdddSAndy Shevchenko if (ir->buf) { 33332cf86f6SMauro Carvalho Chehab poll_wait(file, &ir->buf->wait_poll, wait); 33432cf86f6SMauro Carvalho Chehab 33532cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) 33632cf86f6SMauro Carvalho Chehab ret = 0; 33732cf86f6SMauro Carvalho Chehab else 33832cf86f6SMauro Carvalho Chehab ret = POLLIN | POLLRDNORM; 3393656cdddSAndy Shevchenko } else 34032cf86f6SMauro Carvalho Chehab ret = POLLERR; 34132cf86f6SMauro Carvalho Chehab 34232cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", 34332cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, ret); 34432cf86f6SMauro Carvalho Chehab 34532cf86f6SMauro Carvalho Chehab return ret; 34632cf86f6SMauro Carvalho Chehab } 34732cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_poll); 34832cf86f6SMauro Carvalho Chehab 34932cf86f6SMauro Carvalho Chehab long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 35032cf86f6SMauro Carvalho Chehab { 35132cf86f6SMauro Carvalho Chehab __u32 mode; 35232cf86f6SMauro Carvalho Chehab int result = 0; 353496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 35432cf86f6SMauro Carvalho Chehab 35532cf86f6SMauro Carvalho Chehab if (!ir) { 3563fac0314SAndi Shyti pr_err("no irctl found!\n"); 35732cf86f6SMauro Carvalho Chehab return -ENODEV; 35832cf86f6SMauro Carvalho Chehab } 35932cf86f6SMauro Carvalho Chehab 36032cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", 36132cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, cmd); 36232cf86f6SMauro Carvalho Chehab 363c3c6dd75SDavid Härdeman if (!ir->attached) { 3643fac0314SAndi Shyti dev_err(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", 36532cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 36632cf86f6SMauro Carvalho Chehab return -ENODEV; 36732cf86f6SMauro Carvalho Chehab } 36832cf86f6SMauro Carvalho Chehab 36932cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 37032cf86f6SMauro Carvalho Chehab 37132cf86f6SMauro Carvalho Chehab switch (cmd) { 37232cf86f6SMauro Carvalho Chehab case LIRC_GET_FEATURES: 37360519af3SHans Verkuil result = put_user(ir->d.features, (__u32 __user *)arg); 37432cf86f6SMauro Carvalho Chehab break; 37532cf86f6SMauro Carvalho Chehab case LIRC_GET_REC_MODE: 376bd291208SSean Young if (!LIRC_CAN_REC(ir->d.features)) { 377b4088094SAndi Shyti result = -ENOTTY; 37832cf86f6SMauro Carvalho Chehab break; 37932cf86f6SMauro Carvalho Chehab } 38032cf86f6SMauro Carvalho Chehab 38132cf86f6SMauro Carvalho Chehab result = put_user(LIRC_REC2MODE 38232cf86f6SMauro Carvalho Chehab (ir->d.features & LIRC_CAN_REC_MASK), 38360519af3SHans Verkuil (__u32 __user *)arg); 38432cf86f6SMauro Carvalho Chehab break; 38532cf86f6SMauro Carvalho Chehab case LIRC_SET_REC_MODE: 386bd291208SSean Young if (!LIRC_CAN_REC(ir->d.features)) { 387b4088094SAndi Shyti result = -ENOTTY; 38832cf86f6SMauro Carvalho Chehab break; 38932cf86f6SMauro Carvalho Chehab } 39032cf86f6SMauro Carvalho Chehab 39160519af3SHans Verkuil result = get_user(mode, (__u32 __user *)arg); 39232cf86f6SMauro Carvalho Chehab if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) 39332cf86f6SMauro Carvalho Chehab result = -EINVAL; 39432cf86f6SMauro Carvalho Chehab /* 39532cf86f6SMauro Carvalho Chehab * FIXME: We should actually set the mode somehow but 39632cf86f6SMauro Carvalho Chehab * for now, lirc_serial doesn't support mode changing either 39732cf86f6SMauro Carvalho Chehab */ 39832cf86f6SMauro Carvalho Chehab break; 39932cf86f6SMauro Carvalho Chehab case LIRC_GET_LENGTH: 40060519af3SHans Verkuil result = put_user(ir->d.code_length, (__u32 __user *)arg); 40132cf86f6SMauro Carvalho Chehab break; 40232cf86f6SMauro Carvalho Chehab case LIRC_GET_MIN_TIMEOUT: 40332cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 40432cf86f6SMauro Carvalho Chehab ir->d.min_timeout == 0) { 405b4088094SAndi Shyti result = -ENOTTY; 40632cf86f6SMauro Carvalho Chehab break; 40732cf86f6SMauro Carvalho Chehab } 40832cf86f6SMauro Carvalho Chehab 40960519af3SHans Verkuil result = put_user(ir->d.min_timeout, (__u32 __user *)arg); 41032cf86f6SMauro Carvalho Chehab break; 41132cf86f6SMauro Carvalho Chehab case LIRC_GET_MAX_TIMEOUT: 41232cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 41332cf86f6SMauro Carvalho Chehab ir->d.max_timeout == 0) { 414b4088094SAndi Shyti result = -ENOTTY; 41532cf86f6SMauro Carvalho Chehab break; 41632cf86f6SMauro Carvalho Chehab } 41732cf86f6SMauro Carvalho Chehab 41860519af3SHans Verkuil result = put_user(ir->d.max_timeout, (__u32 __user *)arg); 41932cf86f6SMauro Carvalho Chehab break; 42032cf86f6SMauro Carvalho Chehab default: 4215c862758SSean Young result = -ENOTTY; 42232cf86f6SMauro Carvalho Chehab } 42332cf86f6SMauro Carvalho Chehab 42432cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 42532cf86f6SMauro Carvalho Chehab 42632cf86f6SMauro Carvalho Chehab return result; 42732cf86f6SMauro Carvalho Chehab } 42832cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_ioctl); 42932cf86f6SMauro Carvalho Chehab 43032cf86f6SMauro Carvalho Chehab ssize_t lirc_dev_fop_read(struct file *file, 4310e835087SDan Carpenter char __user *buffer, 43232cf86f6SMauro Carvalho Chehab size_t length, 43332cf86f6SMauro Carvalho Chehab loff_t *ppos) 43432cf86f6SMauro Carvalho Chehab { 435496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 43632cf86f6SMauro Carvalho Chehab unsigned char *buf; 43732cf86f6SMauro Carvalho Chehab int ret = 0, written = 0; 43832cf86f6SMauro Carvalho Chehab DECLARE_WAITQUEUE(wait, current); 43932cf86f6SMauro Carvalho Chehab 44032cf86f6SMauro Carvalho Chehab if (!ir) { 4413fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 44232cf86f6SMauro Carvalho Chehab return -ENODEV; 44332cf86f6SMauro Carvalho Chehab } 44432cf86f6SMauro Carvalho Chehab 44532002f72SSean Young if (!LIRC_CAN_REC(ir->d.features)) 44632002f72SSean Young return -EINVAL; 44732002f72SSean Young 44832cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); 44932cf86f6SMauro Carvalho Chehab 45032cf86f6SMauro Carvalho Chehab buf = kzalloc(ir->chunk_size, GFP_KERNEL); 45132cf86f6SMauro Carvalho Chehab if (!buf) 45232cf86f6SMauro Carvalho Chehab return -ENOMEM; 45332cf86f6SMauro Carvalho Chehab 45432cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 45532cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 45632cf86f6SMauro Carvalho Chehab goto out_unlocked; 45732cf86f6SMauro Carvalho Chehab } 45832cf86f6SMauro Carvalho Chehab if (!ir->attached) { 45932cf86f6SMauro Carvalho Chehab ret = -ENODEV; 46032cf86f6SMauro Carvalho Chehab goto out_locked; 46132cf86f6SMauro Carvalho Chehab } 46232cf86f6SMauro Carvalho Chehab 46332cf86f6SMauro Carvalho Chehab if (length % ir->chunk_size) { 46432cf86f6SMauro Carvalho Chehab ret = -EINVAL; 46532cf86f6SMauro Carvalho Chehab goto out_locked; 46632cf86f6SMauro Carvalho Chehab } 46732cf86f6SMauro Carvalho Chehab 46832cf86f6SMauro Carvalho Chehab /* 46932cf86f6SMauro Carvalho Chehab * we add ourselves to the task queue before buffer check 47032cf86f6SMauro Carvalho Chehab * to avoid losing scan code (in case when queue is awaken somewhere 47132cf86f6SMauro Carvalho Chehab * between while condition checking and scheduling) 47232cf86f6SMauro Carvalho Chehab */ 47332cf86f6SMauro Carvalho Chehab add_wait_queue(&ir->buf->wait_poll, &wait); 47432cf86f6SMauro Carvalho Chehab 47532cf86f6SMauro Carvalho Chehab /* 47632cf86f6SMauro Carvalho Chehab * while we didn't provide 'length' bytes, device is opened in blocking 47732cf86f6SMauro Carvalho Chehab * mode and 'copy_to_user' is happy, wait for data. 47832cf86f6SMauro Carvalho Chehab */ 47932cf86f6SMauro Carvalho Chehab while (written < length && ret == 0) { 48032cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) { 48132cf86f6SMauro Carvalho Chehab /* According to the read(2) man page, 'written' can be 48232cf86f6SMauro Carvalho Chehab * returned as less than 'length', instead of blocking 48332cf86f6SMauro Carvalho Chehab * again, returning -EWOULDBLOCK, or returning 48462e92682SAndi Shyti * -ERESTARTSYS 48562e92682SAndi Shyti */ 48632cf86f6SMauro Carvalho Chehab if (written) 48732cf86f6SMauro Carvalho Chehab break; 48832cf86f6SMauro Carvalho Chehab if (file->f_flags & O_NONBLOCK) { 48932cf86f6SMauro Carvalho Chehab ret = -EWOULDBLOCK; 49032cf86f6SMauro Carvalho Chehab break; 49132cf86f6SMauro Carvalho Chehab } 49232cf86f6SMauro Carvalho Chehab if (signal_pending(current)) { 49332cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 49432cf86f6SMauro Carvalho Chehab break; 49532cf86f6SMauro Carvalho Chehab } 49632cf86f6SMauro Carvalho Chehab 49732cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 49832cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 49912accdcbSSean Young schedule(); 50012accdcbSSean Young set_current_state(TASK_RUNNING); 50132cf86f6SMauro Carvalho Chehab 50232cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 50332cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 50432cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 50532cf86f6SMauro Carvalho Chehab goto out_unlocked; 50632cf86f6SMauro Carvalho Chehab } 50732cf86f6SMauro Carvalho Chehab 50832cf86f6SMauro Carvalho Chehab if (!ir->attached) { 50932cf86f6SMauro Carvalho Chehab ret = -ENODEV; 510c77d17c0SSean Young goto out_locked; 51132cf86f6SMauro Carvalho Chehab } 51232cf86f6SMauro Carvalho Chehab } else { 51332cf86f6SMauro Carvalho Chehab lirc_buffer_read(ir->buf, buf); 51460519af3SHans Verkuil ret = copy_to_user((void __user *)buffer+written, buf, 51532cf86f6SMauro Carvalho Chehab ir->buf->chunk_size); 51632cf86f6SMauro Carvalho Chehab if (!ret) 51732cf86f6SMauro Carvalho Chehab written += ir->buf->chunk_size; 51832cf86f6SMauro Carvalho Chehab else 51932cf86f6SMauro Carvalho Chehab ret = -EFAULT; 52032cf86f6SMauro Carvalho Chehab } 52132cf86f6SMauro Carvalho Chehab } 52232cf86f6SMauro Carvalho Chehab 52332cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 52432cf86f6SMauro Carvalho Chehab 52532cf86f6SMauro Carvalho Chehab out_locked: 52632cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 52732cf86f6SMauro Carvalho Chehab 52832cf86f6SMauro Carvalho Chehab out_unlocked: 52932cf86f6SMauro Carvalho Chehab kfree(buf); 53032cf86f6SMauro Carvalho Chehab 53132cf86f6SMauro Carvalho Chehab return ret ? ret : written; 53232cf86f6SMauro Carvalho Chehab } 53332cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_read); 53432cf86f6SMauro Carvalho Chehab 53532cf86f6SMauro Carvalho Chehab void *lirc_get_pdata(struct file *file) 53632cf86f6SMauro Carvalho Chehab { 5370990a97aSAl Viro return irctls[iminor(file_inode(file))]->d.data; 53832cf86f6SMauro Carvalho Chehab } 53932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_get_pdata); 54032cf86f6SMauro Carvalho Chehab 54132cf86f6SMauro Carvalho Chehab 54232cf86f6SMauro Carvalho Chehab static int __init lirc_dev_init(void) 54332cf86f6SMauro Carvalho Chehab { 54432cf86f6SMauro Carvalho Chehab int retval; 54532cf86f6SMauro Carvalho Chehab 54632cf86f6SMauro Carvalho Chehab lirc_class = class_create(THIS_MODULE, "lirc"); 54732cf86f6SMauro Carvalho Chehab if (IS_ERR(lirc_class)) { 5483fac0314SAndi Shyti pr_err("class_create failed\n"); 54954fcecafSAndi Shyti return PTR_ERR(lirc_class); 55032cf86f6SMauro Carvalho Chehab } 55132cf86f6SMauro Carvalho Chehab 55232cf86f6SMauro Carvalho Chehab retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, 553463015ddSDavid Härdeman "BaseRemoteCtl"); 55432cf86f6SMauro Carvalho Chehab if (retval) { 55532cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 5563fac0314SAndi Shyti pr_err("alloc_chrdev_region failed\n"); 55754fcecafSAndi Shyti return retval; 55832cf86f6SMauro Carvalho Chehab } 55932cf86f6SMauro Carvalho Chehab 5603fac0314SAndi Shyti pr_info("IR Remote Control driver registered, major %d\n", 5613fac0314SAndi Shyti MAJOR(lirc_base_dev)); 56232cf86f6SMauro Carvalho Chehab 56354fcecafSAndi Shyti return 0; 56432cf86f6SMauro Carvalho Chehab } 56532cf86f6SMauro Carvalho Chehab 56632cf86f6SMauro Carvalho Chehab static void __exit lirc_dev_exit(void) 56732cf86f6SMauro Carvalho Chehab { 56832cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 56932cf86f6SMauro Carvalho Chehab unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); 5703fac0314SAndi Shyti pr_info("module unloaded\n"); 57132cf86f6SMauro Carvalho Chehab } 57232cf86f6SMauro Carvalho Chehab 57332cf86f6SMauro Carvalho Chehab module_init(lirc_dev_init); 57432cf86f6SMauro Carvalho Chehab module_exit(lirc_dev_exit); 57532cf86f6SMauro Carvalho Chehab 57632cf86f6SMauro Carvalho Chehab MODULE_DESCRIPTION("LIRC base driver module"); 57732cf86f6SMauro Carvalho Chehab MODULE_AUTHOR("Artur Lipowski"); 57832cf86f6SMauro Carvalho Chehab MODULE_LICENSE("GPL"); 579