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> 2132cf86f6SMauro Carvalho Chehab #include <linux/kernel.h> 22174cd4b1SIngo Molnar #include <linux/sched/signal.h> 2332cf86f6SMauro Carvalho Chehab #include <linux/errno.h> 2432cf86f6SMauro Carvalho Chehab #include <linux/ioctl.h> 2532cf86f6SMauro Carvalho Chehab #include <linux/fs.h> 2632cf86f6SMauro Carvalho Chehab #include <linux/poll.h> 2732cf86f6SMauro Carvalho Chehab #include <linux/completion.h> 2832cf86f6SMauro Carvalho Chehab #include <linux/mutex.h> 2932cf86f6SMauro Carvalho Chehab #include <linux/wait.h> 3032cf86f6SMauro Carvalho Chehab #include <linux/unistd.h> 3132cf86f6SMauro Carvalho Chehab #include <linux/kthread.h> 3232cf86f6SMauro Carvalho Chehab #include <linux/bitops.h> 3332cf86f6SMauro Carvalho Chehab #include <linux/device.h> 3432cf86f6SMauro Carvalho Chehab #include <linux/cdev.h> 3532cf86f6SMauro Carvalho Chehab 36ca7a722dSSrinivas Kandagatla #include <media/rc-core.h> 3732cf86f6SMauro Carvalho Chehab #include <media/lirc.h> 3832cf86f6SMauro Carvalho Chehab #include <media/lirc_dev.h> 3932cf86f6SMauro Carvalho Chehab 4090ab5ee9SRusty Russell static bool debug; 4132cf86f6SMauro Carvalho Chehab 4232cf86f6SMauro Carvalho Chehab #define IRCTL_DEV_NAME "BaseRemoteCtl" 4332cf86f6SMauro Carvalho Chehab #define NOPLUG -1 4432cf86f6SMauro Carvalho Chehab #define LOGHEAD "lirc_dev (%s[%d]): " 4532cf86f6SMauro Carvalho Chehab 4632cf86f6SMauro Carvalho Chehab static dev_t lirc_base_dev; 4732cf86f6SMauro Carvalho Chehab 4832cf86f6SMauro Carvalho Chehab struct irctl { 4932cf86f6SMauro Carvalho Chehab struct lirc_driver d; 5032cf86f6SMauro Carvalho Chehab int attached; 5132cf86f6SMauro Carvalho Chehab int open; 5232cf86f6SMauro Carvalho Chehab 5332cf86f6SMauro Carvalho Chehab struct mutex irctl_lock; 5432cf86f6SMauro Carvalho Chehab struct lirc_buffer *buf; 550f7c4063SDavid Härdeman bool buf_internal; 5632cf86f6SMauro Carvalho Chehab unsigned int chunk_size; 5732cf86f6SMauro Carvalho Chehab 5874c839b2SSean Young struct device dev; 5974c839b2SSean Young struct cdev cdev; 608de111e2SJarod Wilson 6132cf86f6SMauro Carvalho Chehab struct task_struct *task; 6232cf86f6SMauro Carvalho Chehab long jiffies_to_wait; 6332cf86f6SMauro Carvalho Chehab }; 6432cf86f6SMauro Carvalho Chehab 6532cf86f6SMauro Carvalho Chehab static DEFINE_MUTEX(lirc_dev_lock); 6632cf86f6SMauro Carvalho Chehab 6732cf86f6SMauro Carvalho Chehab static struct irctl *irctls[MAX_IRCTL_DEVICES]; 6832cf86f6SMauro Carvalho Chehab 6932cf86f6SMauro Carvalho Chehab /* Only used for sysfs but defined to void otherwise */ 7032cf86f6SMauro Carvalho Chehab static struct class *lirc_class; 7132cf86f6SMauro Carvalho Chehab 7232cf86f6SMauro Carvalho Chehab /* helper function 7332cf86f6SMauro Carvalho Chehab * initializes the irctl structure 7432cf86f6SMauro Carvalho Chehab */ 7532cf86f6SMauro Carvalho Chehab static void lirc_irctl_init(struct irctl *ir) 7632cf86f6SMauro Carvalho Chehab { 7732cf86f6SMauro Carvalho Chehab mutex_init(&ir->irctl_lock); 7832cf86f6SMauro Carvalho Chehab ir->d.minor = NOPLUG; 7932cf86f6SMauro Carvalho Chehab } 8032cf86f6SMauro Carvalho Chehab 8174c839b2SSean Young static void lirc_release(struct device *ld) 8232cf86f6SMauro Carvalho Chehab { 8374c839b2SSean Young struct irctl *ir = container_of(ld, struct irctl, dev); 8474c839b2SSean Young 8574c839b2SSean Young put_device(ir->dev.parent); 8632cf86f6SMauro Carvalho Chehab 870f7c4063SDavid Härdeman if (ir->buf_internal) { 8832cf86f6SMauro Carvalho Chehab lirc_buffer_free(ir->buf); 8932cf86f6SMauro Carvalho Chehab kfree(ir->buf); 9032cf86f6SMauro Carvalho Chehab } 9174c839b2SSean Young 9274c839b2SSean Young mutex_lock(&lirc_dev_lock); 9374c839b2SSean Young irctls[ir->d.minor] = NULL; 9474c839b2SSean Young mutex_unlock(&lirc_dev_lock); 9574c839b2SSean Young kfree(ir); 9632cf86f6SMauro Carvalho Chehab } 9732cf86f6SMauro Carvalho Chehab 9832cf86f6SMauro Carvalho Chehab /* helper function 9932cf86f6SMauro Carvalho Chehab * reads key codes from driver and puts them into buffer 10032cf86f6SMauro Carvalho Chehab * returns 0 on success 10132cf86f6SMauro Carvalho Chehab */ 10232cf86f6SMauro Carvalho Chehab static int lirc_add_to_buf(struct irctl *ir) 10332cf86f6SMauro Carvalho Chehab { 10419e56539SAndi Shyti int res; 1057fe579d2SAndi Shyti int got_data = -1; 10632cf86f6SMauro Carvalho Chehab 10719e56539SAndi Shyti if (!ir->d.add_to_buf) 10819e56539SAndi Shyti return 0; 10919e56539SAndi Shyti 11032cf86f6SMauro Carvalho Chehab /* 11132cf86f6SMauro Carvalho Chehab * service the device as long as it is returning 11232cf86f6SMauro Carvalho Chehab * data and we have space 11332cf86f6SMauro Carvalho Chehab */ 1147fe579d2SAndi Shyti do { 11532cf86f6SMauro Carvalho Chehab got_data++; 1167fe579d2SAndi Shyti res = ir->d.add_to_buf(ir->d.data, ir->buf); 1177fe579d2SAndi Shyti } while (!res); 11832cf86f6SMauro Carvalho Chehab 11932cf86f6SMauro Carvalho Chehab if (res == -ENODEV) 12032cf86f6SMauro Carvalho Chehab kthread_stop(ir->task); 12132cf86f6SMauro Carvalho Chehab 12232cf86f6SMauro Carvalho Chehab return got_data ? 0 : res; 12332cf86f6SMauro Carvalho Chehab } 12432cf86f6SMauro Carvalho Chehab 12532cf86f6SMauro Carvalho Chehab /* main function of the polling thread 12632cf86f6SMauro Carvalho Chehab */ 12732cf86f6SMauro Carvalho Chehab static int lirc_thread(void *irctl) 12832cf86f6SMauro Carvalho Chehab { 12932cf86f6SMauro Carvalho Chehab struct irctl *ir = irctl; 13032cf86f6SMauro Carvalho Chehab 13132cf86f6SMauro Carvalho Chehab do { 13232cf86f6SMauro Carvalho Chehab if (ir->open) { 13332cf86f6SMauro Carvalho Chehab if (ir->jiffies_to_wait) { 13432cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 13532cf86f6SMauro Carvalho Chehab schedule_timeout(ir->jiffies_to_wait); 13632cf86f6SMauro Carvalho Chehab } 13732cf86f6SMauro Carvalho Chehab if (kthread_should_stop()) 13832cf86f6SMauro Carvalho Chehab break; 13932cf86f6SMauro Carvalho Chehab if (!lirc_add_to_buf(ir)) 14032cf86f6SMauro Carvalho Chehab wake_up_interruptible(&ir->buf->wait_poll); 14132cf86f6SMauro Carvalho Chehab } else { 14232cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 14332cf86f6SMauro Carvalho Chehab schedule(); 14432cf86f6SMauro Carvalho Chehab } 14532cf86f6SMauro Carvalho Chehab } while (!kthread_should_stop()); 14632cf86f6SMauro Carvalho Chehab 14732cf86f6SMauro Carvalho Chehab return 0; 14832cf86f6SMauro Carvalho Chehab } 14932cf86f6SMauro Carvalho Chehab 15032cf86f6SMauro Carvalho Chehab 15175ef9de1SAl Viro static const struct file_operations lirc_dev_fops = { 15232cf86f6SMauro Carvalho Chehab .owner = THIS_MODULE, 15332cf86f6SMauro Carvalho Chehab .read = lirc_dev_fop_read, 15432cf86f6SMauro Carvalho Chehab .write = lirc_dev_fop_write, 15532cf86f6SMauro Carvalho Chehab .poll = lirc_dev_fop_poll, 15632cf86f6SMauro Carvalho Chehab .unlocked_ioctl = lirc_dev_fop_ioctl, 15732cf86f6SMauro Carvalho Chehab .open = lirc_dev_fop_open, 15832cf86f6SMauro Carvalho Chehab .release = lirc_dev_fop_close, 15932cf86f6SMauro Carvalho Chehab .llseek = noop_llseek, 16032cf86f6SMauro Carvalho Chehab }; 16132cf86f6SMauro Carvalho Chehab 16232cf86f6SMauro Carvalho Chehab static int lirc_cdev_add(struct irctl *ir) 16332cf86f6SMauro Carvalho Chehab { 16432cf86f6SMauro Carvalho Chehab struct lirc_driver *d = &ir->d; 1658de111e2SJarod Wilson struct cdev *cdev; 166b40769eeSSean Young int retval; 1678de111e2SJarod Wilson 16874c839b2SSean Young cdev = &ir->cdev; 16932cf86f6SMauro Carvalho Chehab 17032cf86f6SMauro Carvalho Chehab if (d->fops) { 17174c839b2SSean Young cdev_init(cdev, d->fops); 17232cf86f6SMauro Carvalho Chehab cdev->owner = d->owner; 17332cf86f6SMauro Carvalho Chehab } else { 17474c839b2SSean Young cdev_init(cdev, &lirc_dev_fops); 17532cf86f6SMauro Carvalho Chehab cdev->owner = THIS_MODULE; 17632cf86f6SMauro Carvalho Chehab } 177b395cbacSVasiliy Kulikov retval = kobject_set_name(&cdev->kobj, "lirc%d", d->minor); 178b395cbacSVasiliy Kulikov if (retval) 17932cf86f6SMauro Carvalho Chehab return retval; 18074c839b2SSean Young 18174c839b2SSean Young cdev->kobj.parent = &ir->dev.kobj; 18274c839b2SSean Young return cdev_add(cdev, ir->dev.devt, 1); 18332cf86f6SMauro Carvalho Chehab } 18432cf86f6SMauro Carvalho Chehab 1856fa99e1aSAndi Shyti static int lirc_allocate_buffer(struct irctl *ir) 1866fa99e1aSAndi Shyti { 18770143984SAndi Shyti int err = 0; 1886fa99e1aSAndi Shyti int bytes_in_key; 1896fa99e1aSAndi Shyti unsigned int chunk_size; 1906fa99e1aSAndi Shyti unsigned int buffer_size; 1916fa99e1aSAndi Shyti struct lirc_driver *d = &ir->d; 1926fa99e1aSAndi Shyti 19370143984SAndi Shyti mutex_lock(&lirc_dev_lock); 19470143984SAndi Shyti 1956fa99e1aSAndi Shyti bytes_in_key = BITS_TO_LONGS(d->code_length) + 1966fa99e1aSAndi Shyti (d->code_length % 8 ? 1 : 0); 1976fa99e1aSAndi Shyti buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; 1986fa99e1aSAndi Shyti chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; 1996fa99e1aSAndi Shyti 2006fa99e1aSAndi Shyti if (d->rbuf) { 2016fa99e1aSAndi Shyti ir->buf = d->rbuf; 2020f7c4063SDavid Härdeman ir->buf_internal = false; 2036fa99e1aSAndi Shyti } else { 2046fa99e1aSAndi Shyti ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); 20570143984SAndi Shyti if (!ir->buf) { 20670143984SAndi Shyti err = -ENOMEM; 20770143984SAndi Shyti goto out; 20870143984SAndi Shyti } 2096fa99e1aSAndi Shyti 2106fa99e1aSAndi Shyti err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); 2116fa99e1aSAndi Shyti if (err) { 2126fa99e1aSAndi Shyti kfree(ir->buf); 2130f7c4063SDavid Härdeman ir->buf = NULL; 21470143984SAndi Shyti goto out; 2156fa99e1aSAndi Shyti } 2160f7c4063SDavid Härdeman 2170f7c4063SDavid Härdeman ir->buf_internal = true; 2186fa99e1aSAndi Shyti } 2196fa99e1aSAndi Shyti ir->chunk_size = ir->buf->chunk_size; 2206fa99e1aSAndi Shyti 22170143984SAndi Shyti out: 22270143984SAndi Shyti mutex_unlock(&lirc_dev_lock); 22370143984SAndi Shyti 22470143984SAndi Shyti return err; 2256fa99e1aSAndi Shyti } 2266fa99e1aSAndi Shyti 22770143984SAndi Shyti static int lirc_allocate_driver(struct lirc_driver *d) 22832cf86f6SMauro Carvalho Chehab { 22932cf86f6SMauro Carvalho Chehab struct irctl *ir; 23032cf86f6SMauro Carvalho Chehab int minor; 23132cf86f6SMauro Carvalho Chehab int err; 23232cf86f6SMauro Carvalho Chehab 23332cf86f6SMauro Carvalho Chehab if (!d) { 2343fac0314SAndi Shyti pr_err("driver pointer must be not NULL!\n"); 23554fcecafSAndi Shyti return -EBADRQC; 23632cf86f6SMauro Carvalho Chehab } 23732cf86f6SMauro Carvalho Chehab 23832cf86f6SMauro Carvalho Chehab if (!d->dev) { 2393fac0314SAndi Shyti pr_err("dev pointer not filled in!\n"); 24054fcecafSAndi Shyti return -EINVAL; 24132cf86f6SMauro Carvalho Chehab } 24232cf86f6SMauro Carvalho Chehab 2439675ee5aSAndi Shyti if (d->minor >= MAX_IRCTL_DEVICES) { 2443fac0314SAndi Shyti dev_err(d->dev, "minor must be between 0 and %d!\n", 2453fac0314SAndi Shyti MAX_IRCTL_DEVICES - 1); 24654fcecafSAndi Shyti return -EBADRQC; 24732cf86f6SMauro Carvalho Chehab } 24832cf86f6SMauro Carvalho Chehab 2499675ee5aSAndi Shyti if (d->code_length < 1 || d->code_length > (BUFLEN * 8)) { 2503fac0314SAndi Shyti dev_err(d->dev, "code length must be less than %d bits\n", 2513fac0314SAndi Shyti BUFLEN * 8); 25254fcecafSAndi Shyti return -EBADRQC; 25332cf86f6SMauro Carvalho Chehab } 25432cf86f6SMauro Carvalho Chehab 25532cf86f6SMauro Carvalho Chehab if (d->sample_rate) { 25632cf86f6SMauro Carvalho Chehab if (2 > d->sample_rate || HZ < d->sample_rate) { 2573fac0314SAndi Shyti dev_err(d->dev, "invalid %d sample rate\n", 2583fac0314SAndi Shyti d->sample_rate); 25954fcecafSAndi Shyti return -EBADRQC; 26032cf86f6SMauro Carvalho Chehab } 26132cf86f6SMauro Carvalho Chehab if (!d->add_to_buf) { 2623fac0314SAndi Shyti dev_err(d->dev, "add_to_buf not set\n"); 26354fcecafSAndi Shyti return -EBADRQC; 26432cf86f6SMauro Carvalho Chehab } 26514db9fc2SAndi Shyti } else if (!d->rbuf && !(d->fops && d->fops->read && 26614db9fc2SAndi Shyti d->fops->poll && d->fops->unlocked_ioctl)) { 2673fac0314SAndi Shyti dev_err(d->dev, "undefined read, poll, ioctl\n"); 26854fcecafSAndi Shyti return -EBADRQC; 26932cf86f6SMauro Carvalho Chehab } 27032cf86f6SMauro Carvalho Chehab 27132cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 27232cf86f6SMauro Carvalho Chehab 27332cf86f6SMauro Carvalho Chehab minor = d->minor; 27432cf86f6SMauro Carvalho Chehab 27532cf86f6SMauro Carvalho Chehab if (minor < 0) { 27632cf86f6SMauro Carvalho Chehab /* find first free slot for driver */ 27732cf86f6SMauro Carvalho Chehab for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) 27832cf86f6SMauro Carvalho Chehab if (!irctls[minor]) 27932cf86f6SMauro Carvalho Chehab break; 2809675ee5aSAndi Shyti if (minor == MAX_IRCTL_DEVICES) { 2813fac0314SAndi Shyti dev_err(d->dev, "no free slots for drivers!\n"); 28232cf86f6SMauro Carvalho Chehab err = -ENOMEM; 28332cf86f6SMauro Carvalho Chehab goto out_lock; 28432cf86f6SMauro Carvalho Chehab } 28532cf86f6SMauro Carvalho Chehab } else if (irctls[minor]) { 2863fac0314SAndi Shyti dev_err(d->dev, "minor (%d) just registered!\n", minor); 28732cf86f6SMauro Carvalho Chehab err = -EBUSY; 28832cf86f6SMauro Carvalho Chehab goto out_lock; 28932cf86f6SMauro Carvalho Chehab } 29032cf86f6SMauro Carvalho Chehab 29132cf86f6SMauro Carvalho Chehab ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); 29232cf86f6SMauro Carvalho Chehab if (!ir) { 29332cf86f6SMauro Carvalho Chehab err = -ENOMEM; 29432cf86f6SMauro Carvalho Chehab goto out_lock; 29532cf86f6SMauro Carvalho Chehab } 29632cf86f6SMauro Carvalho Chehab lirc_irctl_init(ir); 29732cf86f6SMauro Carvalho Chehab irctls[minor] = ir; 29832cf86f6SMauro Carvalho Chehab d->minor = minor; 29932cf86f6SMauro Carvalho Chehab 30032cf86f6SMauro Carvalho Chehab /* some safety check 8-) */ 30132cf86f6SMauro Carvalho Chehab d->name[sizeof(d->name)-1] = '\0'; 30232cf86f6SMauro Carvalho Chehab 30332cf86f6SMauro Carvalho Chehab if (d->features == 0) 30432cf86f6SMauro Carvalho Chehab d->features = LIRC_CAN_REC_LIRCCODE; 30532cf86f6SMauro Carvalho Chehab 30632cf86f6SMauro Carvalho Chehab ir->d = *d; 30732cf86f6SMauro Carvalho Chehab 30874c839b2SSean Young ir->dev.devt = MKDEV(MAJOR(lirc_base_dev), ir->d.minor); 30974c839b2SSean Young ir->dev.class = lirc_class; 31074c839b2SSean Young ir->dev.parent = d->dev; 31174c839b2SSean Young ir->dev.release = lirc_release; 31274c839b2SSean Young dev_set_name(&ir->dev, "lirc%d", ir->d.minor); 31374c839b2SSean Young device_initialize(&ir->dev); 31432cf86f6SMauro Carvalho Chehab 31532cf86f6SMauro Carvalho Chehab if (d->sample_rate) { 3166ab86d2aSAndi Shyti ir->jiffies_to_wait = HZ / d->sample_rate; 3176ab86d2aSAndi Shyti 31832cf86f6SMauro Carvalho Chehab /* try to fire up polling thread */ 31932cf86f6SMauro Carvalho Chehab ir->task = kthread_run(lirc_thread, (void *)ir, "lirc_dev"); 32032cf86f6SMauro Carvalho Chehab if (IS_ERR(ir->task)) { 3213fac0314SAndi Shyti dev_err(d->dev, "cannot run thread for minor = %d\n", 32232cf86f6SMauro Carvalho Chehab d->minor); 32332cf86f6SMauro Carvalho Chehab err = -ECHILD; 32432cf86f6SMauro Carvalho Chehab goto out_sysfs; 32532cf86f6SMauro Carvalho Chehab } 3266ab86d2aSAndi Shyti } else { 3276ab86d2aSAndi Shyti /* it means - wait for external event in task queue */ 3286ab86d2aSAndi Shyti ir->jiffies_to_wait = 0; 32932cf86f6SMauro Carvalho Chehab } 33032cf86f6SMauro Carvalho Chehab 33132cf86f6SMauro Carvalho Chehab err = lirc_cdev_add(ir); 33232cf86f6SMauro Carvalho Chehab if (err) 33332cf86f6SMauro Carvalho Chehab goto out_sysfs; 33432cf86f6SMauro Carvalho Chehab 33532cf86f6SMauro Carvalho Chehab ir->attached = 1; 33674c839b2SSean Young 33774c839b2SSean Young err = device_add(&ir->dev); 33874c839b2SSean Young if (err) 33974c839b2SSean Young goto out_cdev; 34074c839b2SSean Young 34132cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 34232cf86f6SMauro Carvalho Chehab 34374c839b2SSean Young get_device(ir->dev.parent); 34474c839b2SSean Young 34532cf86f6SMauro Carvalho Chehab dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", 34632cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 34732cf86f6SMauro Carvalho Chehab return minor; 34874c839b2SSean Young out_cdev: 34974c839b2SSean Young cdev_del(&ir->cdev); 35032cf86f6SMauro Carvalho Chehab out_sysfs: 35174c839b2SSean Young put_device(&ir->dev); 35232cf86f6SMauro Carvalho Chehab out_lock: 35332cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 35454fcecafSAndi Shyti 35532cf86f6SMauro Carvalho Chehab return err; 35632cf86f6SMauro Carvalho Chehab } 35770143984SAndi Shyti 35870143984SAndi Shyti int lirc_register_driver(struct lirc_driver *d) 35970143984SAndi Shyti { 36070143984SAndi Shyti int minor, err = 0; 36170143984SAndi Shyti 36270143984SAndi Shyti minor = lirc_allocate_driver(d); 36370143984SAndi Shyti if (minor < 0) 36470143984SAndi Shyti return minor; 36570143984SAndi Shyti 36670143984SAndi Shyti if (LIRC_CAN_REC(d->features)) { 36770143984SAndi Shyti err = lirc_allocate_buffer(irctls[minor]); 36870143984SAndi Shyti if (err) 36970143984SAndi Shyti lirc_unregister_driver(minor); 3700f7c4063SDavid Härdeman else 3710f7c4063SDavid Härdeman /* 3720f7c4063SDavid Härdeman * This is kind of a hack but ir-lirc-codec needs 3730f7c4063SDavid Härdeman * access to the buffer that lirc_dev allocated. 3740f7c4063SDavid Härdeman */ 3750f7c4063SDavid Härdeman d->rbuf = irctls[minor]->buf; 37670143984SAndi Shyti } 37770143984SAndi Shyti 37870143984SAndi Shyti return err ? err : minor; 37970143984SAndi Shyti } 38032cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_register_driver); 38132cf86f6SMauro Carvalho Chehab 38232cf86f6SMauro Carvalho Chehab int lirc_unregister_driver(int minor) 38332cf86f6SMauro Carvalho Chehab { 38432cf86f6SMauro Carvalho Chehab struct irctl *ir; 38532cf86f6SMauro Carvalho Chehab 38632cf86f6SMauro Carvalho Chehab if (minor < 0 || minor >= MAX_IRCTL_DEVICES) { 3873fac0314SAndi Shyti pr_err("minor (%d) must be between 0 and %d!\n", 3883fac0314SAndi Shyti minor, MAX_IRCTL_DEVICES - 1); 38932cf86f6SMauro Carvalho Chehab return -EBADRQC; 39032cf86f6SMauro Carvalho Chehab } 39132cf86f6SMauro Carvalho Chehab 39232cf86f6SMauro Carvalho Chehab ir = irctls[minor]; 39332cf86f6SMauro Carvalho Chehab if (!ir) { 3943fac0314SAndi Shyti pr_err("failed to get irctl\n"); 39532cf86f6SMauro Carvalho Chehab return -ENOENT; 39632cf86f6SMauro Carvalho Chehab } 39732cf86f6SMauro Carvalho Chehab 39832cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 39932cf86f6SMauro Carvalho Chehab 40032cf86f6SMauro Carvalho Chehab if (ir->d.minor != minor) { 4013fac0314SAndi Shyti dev_err(ir->d.dev, "lirc_dev: minor %d device not registered\n", 4023fac0314SAndi Shyti minor); 40332cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 40432cf86f6SMauro Carvalho Chehab return -ENOENT; 40532cf86f6SMauro Carvalho Chehab } 40632cf86f6SMauro Carvalho Chehab 40732cf86f6SMauro Carvalho Chehab /* end up polling thread */ 40832cf86f6SMauro Carvalho Chehab if (ir->task) 40932cf86f6SMauro Carvalho Chehab kthread_stop(ir->task); 41032cf86f6SMauro Carvalho Chehab 41132cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", 41232cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 41332cf86f6SMauro Carvalho Chehab 41432cf86f6SMauro Carvalho Chehab ir->attached = 0; 41532cf86f6SMauro Carvalho Chehab if (ir->open) { 41632cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", 41732cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 41832cf86f6SMauro Carvalho Chehab wake_up_interruptible(&ir->buf->wait_poll); 41974c839b2SSean Young } 42074c839b2SSean Young 42132cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 4228e5fa4c6SAndi Shyti 4238e5fa4c6SAndi Shyti if (ir->d.set_use_dec) 42432cf86f6SMauro Carvalho Chehab ir->d.set_use_dec(ir->d.data); 4258e5fa4c6SAndi Shyti 42632cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 42732cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 42832cf86f6SMauro Carvalho Chehab 42974c839b2SSean Young device_del(&ir->dev); 43074c839b2SSean Young cdev_del(&ir->cdev); 43174c839b2SSean Young put_device(&ir->dev); 43274c839b2SSean Young 43332cf86f6SMauro Carvalho Chehab return 0; 43432cf86f6SMauro Carvalho Chehab } 43532cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_unregister_driver); 43632cf86f6SMauro Carvalho Chehab 43732cf86f6SMauro Carvalho Chehab int lirc_dev_fop_open(struct inode *inode, struct file *file) 43832cf86f6SMauro Carvalho Chehab { 43932cf86f6SMauro Carvalho Chehab struct irctl *ir; 44032cf86f6SMauro Carvalho Chehab int retval = 0; 44132cf86f6SMauro Carvalho Chehab 44232cf86f6SMauro Carvalho Chehab if (iminor(inode) >= MAX_IRCTL_DEVICES) { 4433fac0314SAndi Shyti pr_err("open result for %d is -ENODEV\n", iminor(inode)); 44432cf86f6SMauro Carvalho Chehab return -ENODEV; 44532cf86f6SMauro Carvalho Chehab } 44632cf86f6SMauro Carvalho Chehab 44732cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&lirc_dev_lock)) 44832cf86f6SMauro Carvalho Chehab return -ERESTARTSYS; 44932cf86f6SMauro Carvalho Chehab 45032cf86f6SMauro Carvalho Chehab ir = irctls[iminor(inode)]; 451db5b15b7SSean Young mutex_unlock(&lirc_dev_lock); 452db5b15b7SSean Young 45332cf86f6SMauro Carvalho Chehab if (!ir) { 45432cf86f6SMauro Carvalho Chehab retval = -ENODEV; 45532cf86f6SMauro Carvalho Chehab goto error; 45632cf86f6SMauro Carvalho Chehab } 45732cf86f6SMauro Carvalho Chehab 45832cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); 45932cf86f6SMauro Carvalho Chehab 46032cf86f6SMauro Carvalho Chehab if (ir->d.minor == NOPLUG) { 46132cf86f6SMauro Carvalho Chehab retval = -ENODEV; 46232cf86f6SMauro Carvalho Chehab goto error; 46332cf86f6SMauro Carvalho Chehab } 46432cf86f6SMauro Carvalho Chehab 46532cf86f6SMauro Carvalho Chehab if (ir->open) { 46632cf86f6SMauro Carvalho Chehab retval = -EBUSY; 46732cf86f6SMauro Carvalho Chehab goto error; 46832cf86f6SMauro Carvalho Chehab } 46932cf86f6SMauro Carvalho Chehab 470ca7a722dSSrinivas Kandagatla if (ir->d.rdev) { 471ca7a722dSSrinivas Kandagatla retval = rc_open(ir->d.rdev); 472ca7a722dSSrinivas Kandagatla if (retval) 473ca7a722dSSrinivas Kandagatla goto error; 474ca7a722dSSrinivas Kandagatla } 475ca7a722dSSrinivas Kandagatla 47632cf86f6SMauro Carvalho Chehab ir->open++; 4778e5fa4c6SAndi Shyti if (ir->d.set_use_inc) 47832cf86f6SMauro Carvalho Chehab retval = ir->d.set_use_inc(ir->d.data); 47932cf86f6SMauro Carvalho Chehab if (retval) { 48032cf86f6SMauro Carvalho Chehab ir->open--; 48174c839b2SSean Young } else { 48274c839b2SSean Young if (ir->buf) 48332cf86f6SMauro Carvalho Chehab lirc_buffer_clear(ir->buf); 48432cf86f6SMauro Carvalho Chehab if (ir->task) 48532cf86f6SMauro Carvalho Chehab wake_up_process(ir->task); 48632cf86f6SMauro Carvalho Chehab } 48732cf86f6SMauro Carvalho Chehab 48832cf86f6SMauro Carvalho Chehab error: 48932cf86f6SMauro Carvalho Chehab nonseekable_open(inode, file); 49032cf86f6SMauro Carvalho Chehab 49132cf86f6SMauro Carvalho Chehab return retval; 49232cf86f6SMauro Carvalho Chehab } 49332cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_open); 49432cf86f6SMauro Carvalho Chehab 49532cf86f6SMauro Carvalho Chehab int lirc_dev_fop_close(struct inode *inode, struct file *file) 49632cf86f6SMauro Carvalho Chehab { 49732cf86f6SMauro Carvalho Chehab struct irctl *ir = irctls[iminor(inode)]; 498b64e10f3SMauro Carvalho Chehab int ret; 49932cf86f6SMauro Carvalho Chehab 50032cf86f6SMauro Carvalho Chehab if (!ir) { 5013fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 50232cf86f6SMauro Carvalho Chehab return -EINVAL; 50332cf86f6SMauro Carvalho Chehab } 50432cf86f6SMauro Carvalho Chehab 505b64e10f3SMauro Carvalho Chehab ret = mutex_lock_killable(&lirc_dev_lock); 506b64e10f3SMauro Carvalho Chehab WARN_ON(ret); 50732cf86f6SMauro Carvalho Chehab 508ca7a722dSSrinivas Kandagatla rc_close(ir->d.rdev); 509ca7a722dSSrinivas Kandagatla 51032cf86f6SMauro Carvalho Chehab ir->open--; 5118e5fa4c6SAndi Shyti if (ir->d.set_use_dec) 51232cf86f6SMauro Carvalho Chehab ir->d.set_use_dec(ir->d.data); 513b64e10f3SMauro Carvalho Chehab if (!ret) 51432cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 51532cf86f6SMauro Carvalho Chehab 51632cf86f6SMauro Carvalho Chehab return 0; 51732cf86f6SMauro Carvalho Chehab } 51832cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_close); 51932cf86f6SMauro Carvalho Chehab 52032cf86f6SMauro Carvalho Chehab unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) 52132cf86f6SMauro Carvalho Chehab { 522496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 52332cf86f6SMauro Carvalho Chehab unsigned int ret; 52432cf86f6SMauro Carvalho Chehab 52532cf86f6SMauro Carvalho Chehab if (!ir) { 5263fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 52732cf86f6SMauro Carvalho Chehab return POLLERR; 52832cf86f6SMauro Carvalho Chehab } 52932cf86f6SMauro Carvalho Chehab 53032cf86f6SMauro Carvalho Chehab if (!ir->attached) 53132cf86f6SMauro Carvalho Chehab return POLLERR; 53232cf86f6SMauro Carvalho Chehab 5333656cdddSAndy Shevchenko if (ir->buf) { 53432cf86f6SMauro Carvalho Chehab poll_wait(file, &ir->buf->wait_poll, wait); 53532cf86f6SMauro Carvalho Chehab 53632cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) 53732cf86f6SMauro Carvalho Chehab ret = 0; 53832cf86f6SMauro Carvalho Chehab else 53932cf86f6SMauro Carvalho Chehab ret = POLLIN | POLLRDNORM; 5403656cdddSAndy Shevchenko } else 54132cf86f6SMauro Carvalho Chehab ret = POLLERR; 54232cf86f6SMauro Carvalho Chehab 54332cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", 54432cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, ret); 54532cf86f6SMauro Carvalho Chehab 54632cf86f6SMauro Carvalho Chehab return ret; 54732cf86f6SMauro Carvalho Chehab } 54832cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_poll); 54932cf86f6SMauro Carvalho Chehab 55032cf86f6SMauro Carvalho Chehab long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 55132cf86f6SMauro Carvalho Chehab { 55232cf86f6SMauro Carvalho Chehab __u32 mode; 55332cf86f6SMauro Carvalho Chehab int result = 0; 554496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 55532cf86f6SMauro Carvalho Chehab 55632cf86f6SMauro Carvalho Chehab if (!ir) { 5573fac0314SAndi Shyti pr_err("no irctl found!\n"); 55832cf86f6SMauro Carvalho Chehab return -ENODEV; 55932cf86f6SMauro Carvalho Chehab } 56032cf86f6SMauro Carvalho Chehab 56132cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", 56232cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, cmd); 56332cf86f6SMauro Carvalho Chehab 56432cf86f6SMauro Carvalho Chehab if (ir->d.minor == NOPLUG || !ir->attached) { 5653fac0314SAndi Shyti dev_err(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", 56632cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 56732cf86f6SMauro Carvalho Chehab return -ENODEV; 56832cf86f6SMauro Carvalho Chehab } 56932cf86f6SMauro Carvalho Chehab 57032cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 57132cf86f6SMauro Carvalho Chehab 57232cf86f6SMauro Carvalho Chehab switch (cmd) { 57332cf86f6SMauro Carvalho Chehab case LIRC_GET_FEATURES: 57460519af3SHans Verkuil result = put_user(ir->d.features, (__u32 __user *)arg); 57532cf86f6SMauro Carvalho Chehab break; 57632cf86f6SMauro Carvalho Chehab case LIRC_GET_REC_MODE: 577bd291208SSean Young if (!LIRC_CAN_REC(ir->d.features)) { 578b4088094SAndi Shyti result = -ENOTTY; 57932cf86f6SMauro Carvalho Chehab break; 58032cf86f6SMauro Carvalho Chehab } 58132cf86f6SMauro Carvalho Chehab 58232cf86f6SMauro Carvalho Chehab result = put_user(LIRC_REC2MODE 58332cf86f6SMauro Carvalho Chehab (ir->d.features & LIRC_CAN_REC_MASK), 58460519af3SHans Verkuil (__u32 __user *)arg); 58532cf86f6SMauro Carvalho Chehab break; 58632cf86f6SMauro Carvalho Chehab case LIRC_SET_REC_MODE: 587bd291208SSean Young if (!LIRC_CAN_REC(ir->d.features)) { 588b4088094SAndi Shyti result = -ENOTTY; 58932cf86f6SMauro Carvalho Chehab break; 59032cf86f6SMauro Carvalho Chehab } 59132cf86f6SMauro Carvalho Chehab 59260519af3SHans Verkuil result = get_user(mode, (__u32 __user *)arg); 59332cf86f6SMauro Carvalho Chehab if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) 59432cf86f6SMauro Carvalho Chehab result = -EINVAL; 59532cf86f6SMauro Carvalho Chehab /* 59632cf86f6SMauro Carvalho Chehab * FIXME: We should actually set the mode somehow but 59732cf86f6SMauro Carvalho Chehab * for now, lirc_serial doesn't support mode changing either 59832cf86f6SMauro Carvalho Chehab */ 59932cf86f6SMauro Carvalho Chehab break; 60032cf86f6SMauro Carvalho Chehab case LIRC_GET_LENGTH: 60160519af3SHans Verkuil result = put_user(ir->d.code_length, (__u32 __user *)arg); 60232cf86f6SMauro Carvalho Chehab break; 60332cf86f6SMauro Carvalho Chehab case LIRC_GET_MIN_TIMEOUT: 60432cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 60532cf86f6SMauro Carvalho Chehab ir->d.min_timeout == 0) { 606b4088094SAndi Shyti result = -ENOTTY; 60732cf86f6SMauro Carvalho Chehab break; 60832cf86f6SMauro Carvalho Chehab } 60932cf86f6SMauro Carvalho Chehab 61060519af3SHans Verkuil result = put_user(ir->d.min_timeout, (__u32 __user *)arg); 61132cf86f6SMauro Carvalho Chehab break; 61232cf86f6SMauro Carvalho Chehab case LIRC_GET_MAX_TIMEOUT: 61332cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 61432cf86f6SMauro Carvalho Chehab ir->d.max_timeout == 0) { 615b4088094SAndi Shyti result = -ENOTTY; 61632cf86f6SMauro Carvalho Chehab break; 61732cf86f6SMauro Carvalho Chehab } 61832cf86f6SMauro Carvalho Chehab 61960519af3SHans Verkuil result = put_user(ir->d.max_timeout, (__u32 __user *)arg); 62032cf86f6SMauro Carvalho Chehab break; 62132cf86f6SMauro Carvalho Chehab default: 6225c862758SSean Young result = -ENOTTY; 62332cf86f6SMauro Carvalho Chehab } 62432cf86f6SMauro Carvalho Chehab 62532cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 62632cf86f6SMauro Carvalho Chehab 62732cf86f6SMauro Carvalho Chehab return result; 62832cf86f6SMauro Carvalho Chehab } 62932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_ioctl); 63032cf86f6SMauro Carvalho Chehab 63132cf86f6SMauro Carvalho Chehab ssize_t lirc_dev_fop_read(struct file *file, 6320e835087SDan Carpenter char __user *buffer, 63332cf86f6SMauro Carvalho Chehab size_t length, 63432cf86f6SMauro Carvalho Chehab loff_t *ppos) 63532cf86f6SMauro Carvalho Chehab { 636496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 63732cf86f6SMauro Carvalho Chehab unsigned char *buf; 63832cf86f6SMauro Carvalho Chehab int ret = 0, written = 0; 63932cf86f6SMauro Carvalho Chehab DECLARE_WAITQUEUE(wait, current); 64032cf86f6SMauro Carvalho Chehab 64132cf86f6SMauro Carvalho Chehab if (!ir) { 6423fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 64332cf86f6SMauro Carvalho Chehab return -ENODEV; 64432cf86f6SMauro Carvalho Chehab } 64532cf86f6SMauro Carvalho Chehab 64632002f72SSean Young if (!LIRC_CAN_REC(ir->d.features)) 64732002f72SSean Young return -EINVAL; 64832002f72SSean Young 64932cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); 65032cf86f6SMauro Carvalho Chehab 65132cf86f6SMauro Carvalho Chehab buf = kzalloc(ir->chunk_size, GFP_KERNEL); 65232cf86f6SMauro Carvalho Chehab if (!buf) 65332cf86f6SMauro Carvalho Chehab return -ENOMEM; 65432cf86f6SMauro Carvalho Chehab 65532cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 65632cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 65732cf86f6SMauro Carvalho Chehab goto out_unlocked; 65832cf86f6SMauro Carvalho Chehab } 65932cf86f6SMauro Carvalho Chehab if (!ir->attached) { 66032cf86f6SMauro Carvalho Chehab ret = -ENODEV; 66132cf86f6SMauro Carvalho Chehab goto out_locked; 66232cf86f6SMauro Carvalho Chehab } 66332cf86f6SMauro Carvalho Chehab 66432cf86f6SMauro Carvalho Chehab if (length % ir->chunk_size) { 66532cf86f6SMauro Carvalho Chehab ret = -EINVAL; 66632cf86f6SMauro Carvalho Chehab goto out_locked; 66732cf86f6SMauro Carvalho Chehab } 66832cf86f6SMauro Carvalho Chehab 66932cf86f6SMauro Carvalho Chehab /* 67032cf86f6SMauro Carvalho Chehab * we add ourselves to the task queue before buffer check 67132cf86f6SMauro Carvalho Chehab * to avoid losing scan code (in case when queue is awaken somewhere 67232cf86f6SMauro Carvalho Chehab * between while condition checking and scheduling) 67332cf86f6SMauro Carvalho Chehab */ 67432cf86f6SMauro Carvalho Chehab add_wait_queue(&ir->buf->wait_poll, &wait); 67532cf86f6SMauro Carvalho Chehab 67632cf86f6SMauro Carvalho Chehab /* 67732cf86f6SMauro Carvalho Chehab * while we didn't provide 'length' bytes, device is opened in blocking 67832cf86f6SMauro Carvalho Chehab * mode and 'copy_to_user' is happy, wait for data. 67932cf86f6SMauro Carvalho Chehab */ 68032cf86f6SMauro Carvalho Chehab while (written < length && ret == 0) { 68132cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) { 68232cf86f6SMauro Carvalho Chehab /* According to the read(2) man page, 'written' can be 68332cf86f6SMauro Carvalho Chehab * returned as less than 'length', instead of blocking 68432cf86f6SMauro Carvalho Chehab * again, returning -EWOULDBLOCK, or returning 68562e92682SAndi Shyti * -ERESTARTSYS 68662e92682SAndi Shyti */ 68732cf86f6SMauro Carvalho Chehab if (written) 68832cf86f6SMauro Carvalho Chehab break; 68932cf86f6SMauro Carvalho Chehab if (file->f_flags & O_NONBLOCK) { 69032cf86f6SMauro Carvalho Chehab ret = -EWOULDBLOCK; 69132cf86f6SMauro Carvalho Chehab break; 69232cf86f6SMauro Carvalho Chehab } 69332cf86f6SMauro Carvalho Chehab if (signal_pending(current)) { 69432cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 69532cf86f6SMauro Carvalho Chehab break; 69632cf86f6SMauro Carvalho Chehab } 69732cf86f6SMauro Carvalho Chehab 69832cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 69932cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 70012accdcbSSean Young schedule(); 70112accdcbSSean Young set_current_state(TASK_RUNNING); 70232cf86f6SMauro Carvalho Chehab 70332cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 70432cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 70532cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 70632cf86f6SMauro Carvalho Chehab goto out_unlocked; 70732cf86f6SMauro Carvalho Chehab } 70832cf86f6SMauro Carvalho Chehab 70932cf86f6SMauro Carvalho Chehab if (!ir->attached) { 71032cf86f6SMauro Carvalho Chehab ret = -ENODEV; 711c77d17c0SSean Young goto out_locked; 71232cf86f6SMauro Carvalho Chehab } 71332cf86f6SMauro Carvalho Chehab } else { 71432cf86f6SMauro Carvalho Chehab lirc_buffer_read(ir->buf, buf); 71560519af3SHans Verkuil ret = copy_to_user((void __user *)buffer+written, buf, 71632cf86f6SMauro Carvalho Chehab ir->buf->chunk_size); 71732cf86f6SMauro Carvalho Chehab if (!ret) 71832cf86f6SMauro Carvalho Chehab written += ir->buf->chunk_size; 71932cf86f6SMauro Carvalho Chehab else 72032cf86f6SMauro Carvalho Chehab ret = -EFAULT; 72132cf86f6SMauro Carvalho Chehab } 72232cf86f6SMauro Carvalho Chehab } 72332cf86f6SMauro Carvalho Chehab 72432cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 72532cf86f6SMauro Carvalho Chehab 72632cf86f6SMauro Carvalho Chehab out_locked: 72732cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 72832cf86f6SMauro Carvalho Chehab 72932cf86f6SMauro Carvalho Chehab out_unlocked: 73032cf86f6SMauro Carvalho Chehab kfree(buf); 73132cf86f6SMauro Carvalho Chehab 73232cf86f6SMauro Carvalho Chehab return ret ? ret : written; 73332cf86f6SMauro Carvalho Chehab } 73432cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_read); 73532cf86f6SMauro Carvalho Chehab 73632cf86f6SMauro Carvalho Chehab void *lirc_get_pdata(struct file *file) 73732cf86f6SMauro Carvalho Chehab { 7380990a97aSAl Viro return irctls[iminor(file_inode(file))]->d.data; 73932cf86f6SMauro Carvalho Chehab } 74032cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_get_pdata); 74132cf86f6SMauro Carvalho Chehab 74232cf86f6SMauro Carvalho Chehab 7430e835087SDan Carpenter ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer, 74432cf86f6SMauro Carvalho Chehab size_t length, loff_t *ppos) 74532cf86f6SMauro Carvalho Chehab { 746496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 74732cf86f6SMauro Carvalho Chehab 74832cf86f6SMauro Carvalho Chehab if (!ir) { 7493fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 75032cf86f6SMauro Carvalho Chehab return -ENODEV; 75132cf86f6SMauro Carvalho Chehab } 75232cf86f6SMauro Carvalho Chehab 75332cf86f6SMauro Carvalho Chehab if (!ir->attached) 75432cf86f6SMauro Carvalho Chehab return -ENODEV; 75532cf86f6SMauro Carvalho Chehab 75632cf86f6SMauro Carvalho Chehab return -EINVAL; 75732cf86f6SMauro Carvalho Chehab } 75832cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_write); 75932cf86f6SMauro Carvalho Chehab 76032cf86f6SMauro Carvalho Chehab 76132cf86f6SMauro Carvalho Chehab static int __init lirc_dev_init(void) 76232cf86f6SMauro Carvalho Chehab { 76332cf86f6SMauro Carvalho Chehab int retval; 76432cf86f6SMauro Carvalho Chehab 76532cf86f6SMauro Carvalho Chehab lirc_class = class_create(THIS_MODULE, "lirc"); 76632cf86f6SMauro Carvalho Chehab if (IS_ERR(lirc_class)) { 7673fac0314SAndi Shyti pr_err("class_create failed\n"); 76854fcecafSAndi Shyti return PTR_ERR(lirc_class); 76932cf86f6SMauro Carvalho Chehab } 77032cf86f6SMauro Carvalho Chehab 77132cf86f6SMauro Carvalho Chehab retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, 77232cf86f6SMauro Carvalho Chehab IRCTL_DEV_NAME); 77332cf86f6SMauro Carvalho Chehab if (retval) { 77432cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 7753fac0314SAndi Shyti pr_err("alloc_chrdev_region failed\n"); 77654fcecafSAndi Shyti return retval; 77732cf86f6SMauro Carvalho Chehab } 77832cf86f6SMauro Carvalho Chehab 7793fac0314SAndi Shyti pr_info("IR Remote Control driver registered, major %d\n", 7803fac0314SAndi Shyti MAJOR(lirc_base_dev)); 78132cf86f6SMauro Carvalho Chehab 78254fcecafSAndi Shyti return 0; 78332cf86f6SMauro Carvalho Chehab } 78432cf86f6SMauro Carvalho Chehab 78532cf86f6SMauro Carvalho Chehab static void __exit lirc_dev_exit(void) 78632cf86f6SMauro Carvalho Chehab { 78732cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 78832cf86f6SMauro Carvalho Chehab unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); 7893fac0314SAndi Shyti pr_info("module unloaded\n"); 79032cf86f6SMauro Carvalho Chehab } 79132cf86f6SMauro Carvalho Chehab 79232cf86f6SMauro Carvalho Chehab module_init(lirc_dev_init); 79332cf86f6SMauro Carvalho Chehab module_exit(lirc_dev_exit); 79432cf86f6SMauro Carvalho Chehab 79532cf86f6SMauro Carvalho Chehab MODULE_DESCRIPTION("LIRC base driver module"); 79632cf86f6SMauro Carvalho Chehab MODULE_AUTHOR("Artur Lipowski"); 79732cf86f6SMauro Carvalho Chehab MODULE_LICENSE("GPL"); 79832cf86f6SMauro Carvalho Chehab 79932cf86f6SMauro Carvalho Chehab module_param(debug, bool, S_IRUGO | S_IWUSR); 80032cf86f6SMauro Carvalho Chehab MODULE_PARM_DESC(debug, "Enable debugging messages"); 801