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 * You should have received a copy of the GNU General Public License 1732cf86f6SMauro Carvalho Chehab * along with this program; if not, write to the Free Software 1832cf86f6SMauro Carvalho Chehab * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 1932cf86f6SMauro Carvalho Chehab * 2032cf86f6SMauro Carvalho Chehab */ 2132cf86f6SMauro Carvalho Chehab 223fac0314SAndi Shyti #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 233fac0314SAndi Shyti 2432cf86f6SMauro Carvalho Chehab #include <linux/module.h> 2532cf86f6SMauro Carvalho Chehab #include <linux/kernel.h> 2632cf86f6SMauro Carvalho Chehab #include <linux/sched.h> 2732cf86f6SMauro Carvalho Chehab #include <linux/errno.h> 2832cf86f6SMauro Carvalho Chehab #include <linux/ioctl.h> 2932cf86f6SMauro Carvalho Chehab #include <linux/fs.h> 3032cf86f6SMauro Carvalho Chehab #include <linux/poll.h> 3132cf86f6SMauro Carvalho Chehab #include <linux/completion.h> 3232cf86f6SMauro Carvalho Chehab #include <linux/mutex.h> 3332cf86f6SMauro Carvalho Chehab #include <linux/wait.h> 3432cf86f6SMauro Carvalho Chehab #include <linux/unistd.h> 3532cf86f6SMauro Carvalho Chehab #include <linux/kthread.h> 3632cf86f6SMauro Carvalho Chehab #include <linux/bitops.h> 3732cf86f6SMauro Carvalho Chehab #include <linux/device.h> 3832cf86f6SMauro Carvalho Chehab #include <linux/cdev.h> 3932cf86f6SMauro Carvalho Chehab 40ca7a722dSSrinivas Kandagatla #include <media/rc-core.h> 4132cf86f6SMauro Carvalho Chehab #include <media/lirc.h> 4232cf86f6SMauro Carvalho Chehab #include <media/lirc_dev.h> 4332cf86f6SMauro Carvalho Chehab 4490ab5ee9SRusty Russell static bool debug; 4532cf86f6SMauro Carvalho Chehab 4632cf86f6SMauro Carvalho Chehab #define IRCTL_DEV_NAME "BaseRemoteCtl" 4732cf86f6SMauro Carvalho Chehab #define NOPLUG -1 4832cf86f6SMauro Carvalho Chehab #define LOGHEAD "lirc_dev (%s[%d]): " 4932cf86f6SMauro Carvalho Chehab 5032cf86f6SMauro Carvalho Chehab static dev_t lirc_base_dev; 5132cf86f6SMauro Carvalho Chehab 5232cf86f6SMauro Carvalho Chehab struct irctl { 5332cf86f6SMauro Carvalho Chehab struct lirc_driver d; 5432cf86f6SMauro Carvalho Chehab int attached; 5532cf86f6SMauro Carvalho Chehab int open; 5632cf86f6SMauro Carvalho Chehab 5732cf86f6SMauro Carvalho Chehab struct mutex irctl_lock; 5832cf86f6SMauro Carvalho Chehab struct lirc_buffer *buf; 5932cf86f6SMauro Carvalho Chehab unsigned int chunk_size; 6032cf86f6SMauro Carvalho Chehab 618de111e2SJarod Wilson struct cdev *cdev; 628de111e2SJarod Wilson 6332cf86f6SMauro Carvalho Chehab struct task_struct *task; 6432cf86f6SMauro Carvalho Chehab long jiffies_to_wait; 6532cf86f6SMauro Carvalho Chehab }; 6632cf86f6SMauro Carvalho Chehab 6732cf86f6SMauro Carvalho Chehab static DEFINE_MUTEX(lirc_dev_lock); 6832cf86f6SMauro Carvalho Chehab 6932cf86f6SMauro Carvalho Chehab static struct irctl *irctls[MAX_IRCTL_DEVICES]; 7032cf86f6SMauro Carvalho Chehab 7132cf86f6SMauro Carvalho Chehab /* Only used for sysfs but defined to void otherwise */ 7232cf86f6SMauro Carvalho Chehab static struct class *lirc_class; 7332cf86f6SMauro Carvalho Chehab 7432cf86f6SMauro Carvalho Chehab /* helper function 7532cf86f6SMauro Carvalho Chehab * initializes the irctl structure 7632cf86f6SMauro Carvalho Chehab */ 7732cf86f6SMauro Carvalho Chehab static void lirc_irctl_init(struct irctl *ir) 7832cf86f6SMauro Carvalho Chehab { 7932cf86f6SMauro Carvalho Chehab mutex_init(&ir->irctl_lock); 8032cf86f6SMauro Carvalho Chehab ir->d.minor = NOPLUG; 8132cf86f6SMauro Carvalho Chehab } 8232cf86f6SMauro Carvalho Chehab 8332cf86f6SMauro Carvalho Chehab static void lirc_irctl_cleanup(struct irctl *ir) 8432cf86f6SMauro Carvalho Chehab { 8532cf86f6SMauro Carvalho Chehab device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); 8632cf86f6SMauro Carvalho Chehab 8732cf86f6SMauro Carvalho Chehab if (ir->buf != ir->d.rbuf) { 8832cf86f6SMauro Carvalho Chehab lirc_buffer_free(ir->buf); 8932cf86f6SMauro Carvalho Chehab kfree(ir->buf); 9032cf86f6SMauro Carvalho Chehab } 9132cf86f6SMauro Carvalho Chehab ir->buf = NULL; 9232cf86f6SMauro Carvalho Chehab } 9332cf86f6SMauro Carvalho Chehab 9432cf86f6SMauro Carvalho Chehab /* helper function 9532cf86f6SMauro Carvalho Chehab * reads key codes from driver and puts them into buffer 9632cf86f6SMauro Carvalho Chehab * returns 0 on success 9732cf86f6SMauro Carvalho Chehab */ 9832cf86f6SMauro Carvalho Chehab static int lirc_add_to_buf(struct irctl *ir) 9932cf86f6SMauro Carvalho Chehab { 10019e56539SAndi Shyti int res; 1017fe579d2SAndi Shyti int got_data = -1; 10232cf86f6SMauro Carvalho Chehab 10319e56539SAndi Shyti if (!ir->d.add_to_buf) 10419e56539SAndi Shyti return 0; 10519e56539SAndi Shyti 10632cf86f6SMauro Carvalho Chehab /* 10732cf86f6SMauro Carvalho Chehab * service the device as long as it is returning 10832cf86f6SMauro Carvalho Chehab * data and we have space 10932cf86f6SMauro Carvalho Chehab */ 1107fe579d2SAndi Shyti do { 11132cf86f6SMauro Carvalho Chehab got_data++; 1127fe579d2SAndi Shyti res = ir->d.add_to_buf(ir->d.data, ir->buf); 1137fe579d2SAndi Shyti } while (!res); 11432cf86f6SMauro Carvalho Chehab 11532cf86f6SMauro Carvalho Chehab if (res == -ENODEV) 11632cf86f6SMauro Carvalho Chehab kthread_stop(ir->task); 11732cf86f6SMauro Carvalho Chehab 11832cf86f6SMauro Carvalho Chehab return got_data ? 0 : res; 11932cf86f6SMauro Carvalho Chehab } 12032cf86f6SMauro Carvalho Chehab 12132cf86f6SMauro Carvalho Chehab /* main function of the polling thread 12232cf86f6SMauro Carvalho Chehab */ 12332cf86f6SMauro Carvalho Chehab static int lirc_thread(void *irctl) 12432cf86f6SMauro Carvalho Chehab { 12532cf86f6SMauro Carvalho Chehab struct irctl *ir = irctl; 12632cf86f6SMauro Carvalho Chehab 12732cf86f6SMauro Carvalho Chehab do { 12832cf86f6SMauro Carvalho Chehab if (ir->open) { 12932cf86f6SMauro Carvalho Chehab if (ir->jiffies_to_wait) { 13032cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 13132cf86f6SMauro Carvalho Chehab schedule_timeout(ir->jiffies_to_wait); 13232cf86f6SMauro Carvalho Chehab } 13332cf86f6SMauro Carvalho Chehab if (kthread_should_stop()) 13432cf86f6SMauro Carvalho Chehab break; 13532cf86f6SMauro Carvalho Chehab if (!lirc_add_to_buf(ir)) 13632cf86f6SMauro Carvalho Chehab wake_up_interruptible(&ir->buf->wait_poll); 13732cf86f6SMauro Carvalho Chehab } else { 13832cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 13932cf86f6SMauro Carvalho Chehab schedule(); 14032cf86f6SMauro Carvalho Chehab } 14132cf86f6SMauro Carvalho Chehab } while (!kthread_should_stop()); 14232cf86f6SMauro Carvalho Chehab 14332cf86f6SMauro Carvalho Chehab return 0; 14432cf86f6SMauro Carvalho Chehab } 14532cf86f6SMauro Carvalho Chehab 14632cf86f6SMauro Carvalho Chehab 14775ef9de1SAl Viro static const struct file_operations lirc_dev_fops = { 14832cf86f6SMauro Carvalho Chehab .owner = THIS_MODULE, 14932cf86f6SMauro Carvalho Chehab .read = lirc_dev_fop_read, 15032cf86f6SMauro Carvalho Chehab .write = lirc_dev_fop_write, 15132cf86f6SMauro Carvalho Chehab .poll = lirc_dev_fop_poll, 15232cf86f6SMauro Carvalho Chehab .unlocked_ioctl = lirc_dev_fop_ioctl, 15332cf86f6SMauro Carvalho Chehab #ifdef CONFIG_COMPAT 15432cf86f6SMauro Carvalho Chehab .compat_ioctl = lirc_dev_fop_ioctl, 15532cf86f6SMauro Carvalho Chehab #endif 15632cf86f6SMauro Carvalho Chehab .open = lirc_dev_fop_open, 15732cf86f6SMauro Carvalho Chehab .release = lirc_dev_fop_close, 15832cf86f6SMauro Carvalho Chehab .llseek = noop_llseek, 15932cf86f6SMauro Carvalho Chehab }; 16032cf86f6SMauro Carvalho Chehab 16132cf86f6SMauro Carvalho Chehab static int lirc_cdev_add(struct irctl *ir) 16232cf86f6SMauro Carvalho Chehab { 1638de111e2SJarod Wilson int retval = -ENOMEM; 16432cf86f6SMauro Carvalho Chehab struct lirc_driver *d = &ir->d; 1658de111e2SJarod Wilson struct cdev *cdev; 1668de111e2SJarod Wilson 1678de111e2SJarod Wilson cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); 1688de111e2SJarod Wilson if (!cdev) 1698de111e2SJarod Wilson goto err_out; 17032cf86f6SMauro Carvalho Chehab 17132cf86f6SMauro Carvalho Chehab if (d->fops) { 17232cf86f6SMauro Carvalho Chehab cdev_init(cdev, d->fops); 17332cf86f6SMauro Carvalho Chehab cdev->owner = d->owner; 17432cf86f6SMauro Carvalho Chehab } else { 17532cf86f6SMauro Carvalho Chehab cdev_init(cdev, &lirc_dev_fops); 17632cf86f6SMauro Carvalho Chehab cdev->owner = THIS_MODULE; 17732cf86f6SMauro Carvalho Chehab } 178b395cbacSVasiliy Kulikov retval = kobject_set_name(&cdev->kobj, "lirc%d", d->minor); 179b395cbacSVasiliy Kulikov if (retval) 1808de111e2SJarod Wilson goto err_out; 18132cf86f6SMauro Carvalho Chehab 18232cf86f6SMauro Carvalho Chehab retval = cdev_add(cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1); 1838de111e2SJarod Wilson if (retval) { 18432cf86f6SMauro Carvalho Chehab kobject_put(&cdev->kobj); 1858de111e2SJarod Wilson goto err_out; 1868de111e2SJarod Wilson } 18732cf86f6SMauro Carvalho Chehab 1888de111e2SJarod Wilson ir->cdev = cdev; 1898de111e2SJarod Wilson 1908de111e2SJarod Wilson return 0; 1918de111e2SJarod Wilson 1928de111e2SJarod Wilson err_out: 1938de111e2SJarod Wilson kfree(cdev); 19432cf86f6SMauro Carvalho Chehab return retval; 19532cf86f6SMauro Carvalho Chehab } 19632cf86f6SMauro Carvalho Chehab 1976fa99e1aSAndi Shyti static int lirc_allocate_buffer(struct irctl *ir) 1986fa99e1aSAndi Shyti { 19970143984SAndi Shyti int err = 0; 2006fa99e1aSAndi Shyti int bytes_in_key; 2016fa99e1aSAndi Shyti unsigned int chunk_size; 2026fa99e1aSAndi Shyti unsigned int buffer_size; 2036fa99e1aSAndi Shyti struct lirc_driver *d = &ir->d; 2046fa99e1aSAndi Shyti 20570143984SAndi Shyti mutex_lock(&lirc_dev_lock); 20670143984SAndi Shyti 2076fa99e1aSAndi Shyti bytes_in_key = BITS_TO_LONGS(d->code_length) + 2086fa99e1aSAndi Shyti (d->code_length % 8 ? 1 : 0); 2096fa99e1aSAndi Shyti buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; 2106fa99e1aSAndi Shyti chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; 2116fa99e1aSAndi Shyti 2126fa99e1aSAndi Shyti if (d->rbuf) { 2136fa99e1aSAndi Shyti ir->buf = d->rbuf; 2146fa99e1aSAndi Shyti } else { 2156fa99e1aSAndi Shyti ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); 21670143984SAndi Shyti if (!ir->buf) { 21770143984SAndi Shyti err = -ENOMEM; 21870143984SAndi Shyti goto out; 21970143984SAndi Shyti } 2206fa99e1aSAndi Shyti 2216fa99e1aSAndi Shyti err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); 2226fa99e1aSAndi Shyti if (err) { 2236fa99e1aSAndi Shyti kfree(ir->buf); 22470143984SAndi Shyti goto out; 2256fa99e1aSAndi Shyti } 2266fa99e1aSAndi Shyti } 2276fa99e1aSAndi Shyti ir->chunk_size = ir->buf->chunk_size; 2286fa99e1aSAndi Shyti 22970143984SAndi Shyti out: 23070143984SAndi Shyti mutex_unlock(&lirc_dev_lock); 23170143984SAndi Shyti 23270143984SAndi Shyti return err; 2336fa99e1aSAndi Shyti } 2346fa99e1aSAndi Shyti 23570143984SAndi Shyti static int lirc_allocate_driver(struct lirc_driver *d) 23632cf86f6SMauro Carvalho Chehab { 23732cf86f6SMauro Carvalho Chehab struct irctl *ir; 23832cf86f6SMauro Carvalho Chehab int minor; 23932cf86f6SMauro Carvalho Chehab int err; 24032cf86f6SMauro Carvalho Chehab 24132cf86f6SMauro Carvalho Chehab if (!d) { 2423fac0314SAndi Shyti pr_err("driver pointer must be not NULL!\n"); 24354fcecafSAndi Shyti return -EBADRQC; 24432cf86f6SMauro Carvalho Chehab } 24532cf86f6SMauro Carvalho Chehab 24632cf86f6SMauro Carvalho Chehab if (!d->dev) { 2473fac0314SAndi Shyti pr_err("dev pointer not filled in!\n"); 24854fcecafSAndi Shyti return -EINVAL; 24932cf86f6SMauro Carvalho Chehab } 25032cf86f6SMauro Carvalho Chehab 2519675ee5aSAndi Shyti if (d->minor >= MAX_IRCTL_DEVICES) { 2523fac0314SAndi Shyti dev_err(d->dev, "minor must be between 0 and %d!\n", 2533fac0314SAndi Shyti MAX_IRCTL_DEVICES - 1); 25454fcecafSAndi Shyti return -EBADRQC; 25532cf86f6SMauro Carvalho Chehab } 25632cf86f6SMauro Carvalho Chehab 2579675ee5aSAndi Shyti if (d->code_length < 1 || d->code_length > (BUFLEN * 8)) { 2583fac0314SAndi Shyti dev_err(d->dev, "code length must be less than %d bits\n", 2593fac0314SAndi Shyti BUFLEN * 8); 26054fcecafSAndi Shyti return -EBADRQC; 26132cf86f6SMauro Carvalho Chehab } 26232cf86f6SMauro Carvalho Chehab 26332cf86f6SMauro Carvalho Chehab if (d->sample_rate) { 26432cf86f6SMauro Carvalho Chehab if (2 > d->sample_rate || HZ < d->sample_rate) { 2653fac0314SAndi Shyti dev_err(d->dev, "invalid %d sample rate\n", 2663fac0314SAndi Shyti d->sample_rate); 26754fcecafSAndi Shyti return -EBADRQC; 26832cf86f6SMauro Carvalho Chehab } 26932cf86f6SMauro Carvalho Chehab if (!d->add_to_buf) { 2703fac0314SAndi Shyti dev_err(d->dev, "add_to_buf not set\n"); 27154fcecafSAndi Shyti return -EBADRQC; 27232cf86f6SMauro Carvalho Chehab } 27314db9fc2SAndi Shyti } else if (!d->rbuf && !(d->fops && d->fops->read && 27414db9fc2SAndi Shyti d->fops->poll && d->fops->unlocked_ioctl)) { 2753fac0314SAndi Shyti dev_err(d->dev, "undefined read, poll, ioctl\n"); 27654fcecafSAndi Shyti return -EBADRQC; 27732cf86f6SMauro Carvalho Chehab } 27832cf86f6SMauro Carvalho Chehab 27932cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 28032cf86f6SMauro Carvalho Chehab 28132cf86f6SMauro Carvalho Chehab minor = d->minor; 28232cf86f6SMauro Carvalho Chehab 28332cf86f6SMauro Carvalho Chehab if (minor < 0) { 28432cf86f6SMauro Carvalho Chehab /* find first free slot for driver */ 28532cf86f6SMauro Carvalho Chehab for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) 28632cf86f6SMauro Carvalho Chehab if (!irctls[minor]) 28732cf86f6SMauro Carvalho Chehab break; 2889675ee5aSAndi Shyti if (minor == MAX_IRCTL_DEVICES) { 2893fac0314SAndi Shyti dev_err(d->dev, "no free slots for drivers!\n"); 29032cf86f6SMauro Carvalho Chehab err = -ENOMEM; 29132cf86f6SMauro Carvalho Chehab goto out_lock; 29232cf86f6SMauro Carvalho Chehab } 29332cf86f6SMauro Carvalho Chehab } else if (irctls[minor]) { 2943fac0314SAndi Shyti dev_err(d->dev, "minor (%d) just registered!\n", minor); 29532cf86f6SMauro Carvalho Chehab err = -EBUSY; 29632cf86f6SMauro Carvalho Chehab goto out_lock; 29732cf86f6SMauro Carvalho Chehab } 29832cf86f6SMauro Carvalho Chehab 29932cf86f6SMauro Carvalho Chehab ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); 30032cf86f6SMauro Carvalho Chehab if (!ir) { 30132cf86f6SMauro Carvalho Chehab err = -ENOMEM; 30232cf86f6SMauro Carvalho Chehab goto out_lock; 30332cf86f6SMauro Carvalho Chehab } 30432cf86f6SMauro Carvalho Chehab lirc_irctl_init(ir); 30532cf86f6SMauro Carvalho Chehab irctls[minor] = ir; 30632cf86f6SMauro Carvalho Chehab d->minor = minor; 30732cf86f6SMauro Carvalho Chehab 30832cf86f6SMauro Carvalho Chehab /* some safety check 8-) */ 30932cf86f6SMauro Carvalho Chehab d->name[sizeof(d->name)-1] = '\0'; 31032cf86f6SMauro Carvalho Chehab 31132cf86f6SMauro Carvalho Chehab if (d->features == 0) 31232cf86f6SMauro Carvalho Chehab d->features = LIRC_CAN_REC_LIRCCODE; 31332cf86f6SMauro Carvalho Chehab 31432cf86f6SMauro Carvalho Chehab ir->d = *d; 31532cf86f6SMauro Carvalho Chehab 31632cf86f6SMauro Carvalho Chehab device_create(lirc_class, ir->d.dev, 31732cf86f6SMauro Carvalho Chehab MKDEV(MAJOR(lirc_base_dev), ir->d.minor), NULL, 31832cf86f6SMauro Carvalho Chehab "lirc%u", ir->d.minor); 31932cf86f6SMauro Carvalho Chehab 32032cf86f6SMauro Carvalho Chehab if (d->sample_rate) { 3216ab86d2aSAndi Shyti ir->jiffies_to_wait = HZ / d->sample_rate; 3226ab86d2aSAndi Shyti 32332cf86f6SMauro Carvalho Chehab /* try to fire up polling thread */ 32432cf86f6SMauro Carvalho Chehab ir->task = kthread_run(lirc_thread, (void *)ir, "lirc_dev"); 32532cf86f6SMauro Carvalho Chehab if (IS_ERR(ir->task)) { 3263fac0314SAndi Shyti dev_err(d->dev, "cannot run thread for minor = %d\n", 32732cf86f6SMauro Carvalho Chehab d->minor); 32832cf86f6SMauro Carvalho Chehab err = -ECHILD; 32932cf86f6SMauro Carvalho Chehab goto out_sysfs; 33032cf86f6SMauro Carvalho Chehab } 3316ab86d2aSAndi Shyti } else { 3326ab86d2aSAndi Shyti /* it means - wait for external event in task queue */ 3336ab86d2aSAndi Shyti ir->jiffies_to_wait = 0; 33432cf86f6SMauro Carvalho Chehab } 33532cf86f6SMauro Carvalho Chehab 33632cf86f6SMauro Carvalho Chehab err = lirc_cdev_add(ir); 33732cf86f6SMauro Carvalho Chehab if (err) 33832cf86f6SMauro Carvalho Chehab goto out_sysfs; 33932cf86f6SMauro Carvalho Chehab 34032cf86f6SMauro Carvalho Chehab ir->attached = 1; 34132cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 34232cf86f6SMauro Carvalho Chehab 34332cf86f6SMauro Carvalho Chehab dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", 34432cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 34532cf86f6SMauro Carvalho Chehab return minor; 34632cf86f6SMauro Carvalho Chehab 34732cf86f6SMauro Carvalho Chehab out_sysfs: 34832cf86f6SMauro Carvalho Chehab device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); 34932cf86f6SMauro Carvalho Chehab out_lock: 35032cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 35154fcecafSAndi Shyti 35232cf86f6SMauro Carvalho Chehab return err; 35332cf86f6SMauro Carvalho Chehab } 35470143984SAndi Shyti 35570143984SAndi Shyti int lirc_register_driver(struct lirc_driver *d) 35670143984SAndi Shyti { 35770143984SAndi Shyti int minor, err = 0; 35870143984SAndi Shyti 35970143984SAndi Shyti minor = lirc_allocate_driver(d); 36070143984SAndi Shyti if (minor < 0) 36170143984SAndi Shyti return minor; 36270143984SAndi Shyti 36370143984SAndi Shyti if (LIRC_CAN_REC(d->features)) { 36470143984SAndi Shyti err = lirc_allocate_buffer(irctls[minor]); 36570143984SAndi Shyti if (err) 36670143984SAndi Shyti lirc_unregister_driver(minor); 36770143984SAndi Shyti } 36870143984SAndi Shyti 36970143984SAndi Shyti return err ? err : minor; 37070143984SAndi Shyti } 37132cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_register_driver); 37232cf86f6SMauro Carvalho Chehab 37332cf86f6SMauro Carvalho Chehab int lirc_unregister_driver(int minor) 37432cf86f6SMauro Carvalho Chehab { 37532cf86f6SMauro Carvalho Chehab struct irctl *ir; 37632cf86f6SMauro Carvalho Chehab struct cdev *cdev; 37732cf86f6SMauro Carvalho Chehab 37832cf86f6SMauro Carvalho Chehab if (minor < 0 || minor >= MAX_IRCTL_DEVICES) { 3793fac0314SAndi Shyti pr_err("minor (%d) must be between 0 and %d!\n", 3803fac0314SAndi Shyti minor, MAX_IRCTL_DEVICES - 1); 38132cf86f6SMauro Carvalho Chehab return -EBADRQC; 38232cf86f6SMauro Carvalho Chehab } 38332cf86f6SMauro Carvalho Chehab 38432cf86f6SMauro Carvalho Chehab ir = irctls[minor]; 38532cf86f6SMauro Carvalho Chehab if (!ir) { 3863fac0314SAndi Shyti pr_err("failed to get irctl\n"); 38732cf86f6SMauro Carvalho Chehab return -ENOENT; 38832cf86f6SMauro Carvalho Chehab } 38932cf86f6SMauro Carvalho Chehab 3908de111e2SJarod Wilson cdev = ir->cdev; 39132cf86f6SMauro Carvalho Chehab 39232cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 39332cf86f6SMauro Carvalho Chehab 39432cf86f6SMauro Carvalho Chehab if (ir->d.minor != minor) { 3953fac0314SAndi Shyti dev_err(ir->d.dev, "lirc_dev: minor %d device not registered\n", 3963fac0314SAndi Shyti minor); 39732cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 39832cf86f6SMauro Carvalho Chehab return -ENOENT; 39932cf86f6SMauro Carvalho Chehab } 40032cf86f6SMauro Carvalho Chehab 40132cf86f6SMauro Carvalho Chehab /* end up polling thread */ 40232cf86f6SMauro Carvalho Chehab if (ir->task) 40332cf86f6SMauro Carvalho Chehab kthread_stop(ir->task); 40432cf86f6SMauro Carvalho Chehab 40532cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", 40632cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 40732cf86f6SMauro Carvalho Chehab 40832cf86f6SMauro Carvalho Chehab ir->attached = 0; 40932cf86f6SMauro Carvalho Chehab if (ir->open) { 41032cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", 41132cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 41232cf86f6SMauro Carvalho Chehab wake_up_interruptible(&ir->buf->wait_poll); 41332cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 41432cf86f6SMauro Carvalho Chehab ir->d.set_use_dec(ir->d.data); 41532cf86f6SMauro Carvalho Chehab module_put(cdev->owner); 41632cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 41732cf86f6SMauro Carvalho Chehab } else { 41832cf86f6SMauro Carvalho Chehab lirc_irctl_cleanup(ir); 41932cf86f6SMauro Carvalho Chehab cdev_del(cdev); 4208de111e2SJarod Wilson kfree(cdev); 42132cf86f6SMauro Carvalho Chehab kfree(ir); 42232cf86f6SMauro Carvalho Chehab irctls[minor] = NULL; 42332cf86f6SMauro Carvalho Chehab } 42432cf86f6SMauro Carvalho Chehab 42532cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 42632cf86f6SMauro Carvalho Chehab 42732cf86f6SMauro Carvalho Chehab return 0; 42832cf86f6SMauro Carvalho Chehab } 42932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_unregister_driver); 43032cf86f6SMauro Carvalho Chehab 43132cf86f6SMauro Carvalho Chehab int lirc_dev_fop_open(struct inode *inode, struct file *file) 43232cf86f6SMauro Carvalho Chehab { 43332cf86f6SMauro Carvalho Chehab struct irctl *ir; 43432cf86f6SMauro Carvalho Chehab struct cdev *cdev; 43532cf86f6SMauro Carvalho Chehab int retval = 0; 43632cf86f6SMauro Carvalho Chehab 43732cf86f6SMauro Carvalho Chehab if (iminor(inode) >= MAX_IRCTL_DEVICES) { 4383fac0314SAndi Shyti pr_err("open result for %d is -ENODEV\n", iminor(inode)); 43932cf86f6SMauro Carvalho Chehab return -ENODEV; 44032cf86f6SMauro Carvalho Chehab } 44132cf86f6SMauro Carvalho Chehab 44232cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&lirc_dev_lock)) 44332cf86f6SMauro Carvalho Chehab return -ERESTARTSYS; 44432cf86f6SMauro Carvalho Chehab 44532cf86f6SMauro Carvalho Chehab ir = irctls[iminor(inode)]; 44632cf86f6SMauro Carvalho Chehab if (!ir) { 44732cf86f6SMauro Carvalho Chehab retval = -ENODEV; 44832cf86f6SMauro Carvalho Chehab goto error; 44932cf86f6SMauro Carvalho Chehab } 45032cf86f6SMauro Carvalho Chehab 45132cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); 45232cf86f6SMauro Carvalho Chehab 45332cf86f6SMauro Carvalho Chehab if (ir->d.minor == NOPLUG) { 45432cf86f6SMauro Carvalho Chehab retval = -ENODEV; 45532cf86f6SMauro Carvalho Chehab goto error; 45632cf86f6SMauro Carvalho Chehab } 45732cf86f6SMauro Carvalho Chehab 45832cf86f6SMauro Carvalho Chehab if (ir->open) { 45932cf86f6SMauro Carvalho Chehab retval = -EBUSY; 46032cf86f6SMauro Carvalho Chehab goto error; 46132cf86f6SMauro Carvalho Chehab } 46232cf86f6SMauro Carvalho Chehab 463ca7a722dSSrinivas Kandagatla if (ir->d.rdev) { 464ca7a722dSSrinivas Kandagatla retval = rc_open(ir->d.rdev); 465ca7a722dSSrinivas Kandagatla if (retval) 466ca7a722dSSrinivas Kandagatla goto error; 467ca7a722dSSrinivas Kandagatla } 468ca7a722dSSrinivas Kandagatla 4698de111e2SJarod Wilson cdev = ir->cdev; 47032cf86f6SMauro Carvalho Chehab if (try_module_get(cdev->owner)) { 47132cf86f6SMauro Carvalho Chehab ir->open++; 47232cf86f6SMauro Carvalho Chehab retval = ir->d.set_use_inc(ir->d.data); 47332cf86f6SMauro Carvalho Chehab 47432cf86f6SMauro Carvalho Chehab if (retval) { 47532cf86f6SMauro Carvalho Chehab module_put(cdev->owner); 47632cf86f6SMauro Carvalho Chehab ir->open--; 47732cf86f6SMauro Carvalho Chehab } else { 47832cf86f6SMauro Carvalho Chehab lirc_buffer_clear(ir->buf); 47932cf86f6SMauro Carvalho Chehab } 48032cf86f6SMauro Carvalho Chehab if (ir->task) 48132cf86f6SMauro Carvalho Chehab wake_up_process(ir->task); 48232cf86f6SMauro Carvalho Chehab } 48332cf86f6SMauro Carvalho Chehab 48432cf86f6SMauro Carvalho Chehab error: 48532cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 48632cf86f6SMauro Carvalho Chehab 48732cf86f6SMauro Carvalho Chehab nonseekable_open(inode, file); 48832cf86f6SMauro Carvalho Chehab 48932cf86f6SMauro Carvalho Chehab return retval; 49032cf86f6SMauro Carvalho Chehab } 49132cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_open); 49232cf86f6SMauro Carvalho Chehab 49332cf86f6SMauro Carvalho Chehab int lirc_dev_fop_close(struct inode *inode, struct file *file) 49432cf86f6SMauro Carvalho Chehab { 49532cf86f6SMauro Carvalho Chehab struct irctl *ir = irctls[iminor(inode)]; 4968de111e2SJarod Wilson struct cdev *cdev; 497b64e10f3SMauro Carvalho Chehab int ret; 49832cf86f6SMauro Carvalho Chehab 49932cf86f6SMauro Carvalho Chehab if (!ir) { 5003fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 50132cf86f6SMauro Carvalho Chehab return -EINVAL; 50232cf86f6SMauro Carvalho Chehab } 50332cf86f6SMauro Carvalho Chehab 5048de111e2SJarod Wilson cdev = ir->cdev; 5058de111e2SJarod Wilson 506b64e10f3SMauro Carvalho Chehab ret = mutex_lock_killable(&lirc_dev_lock); 507b64e10f3SMauro Carvalho Chehab WARN_ON(ret); 50832cf86f6SMauro Carvalho Chehab 509ca7a722dSSrinivas Kandagatla rc_close(ir->d.rdev); 510ca7a722dSSrinivas Kandagatla 51132cf86f6SMauro Carvalho Chehab ir->open--; 51232cf86f6SMauro Carvalho Chehab if (ir->attached) { 51332cf86f6SMauro Carvalho Chehab ir->d.set_use_dec(ir->d.data); 51432cf86f6SMauro Carvalho Chehab module_put(cdev->owner); 51532cf86f6SMauro Carvalho Chehab } else { 51632cf86f6SMauro Carvalho Chehab lirc_irctl_cleanup(ir); 51732cf86f6SMauro Carvalho Chehab cdev_del(cdev); 51832cf86f6SMauro Carvalho Chehab irctls[ir->d.minor] = NULL; 5198de111e2SJarod Wilson kfree(cdev); 52032cf86f6SMauro Carvalho Chehab kfree(ir); 52132cf86f6SMauro Carvalho Chehab } 52232cf86f6SMauro Carvalho Chehab 523b64e10f3SMauro Carvalho Chehab if (!ret) 52432cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 52532cf86f6SMauro Carvalho Chehab 52632cf86f6SMauro Carvalho Chehab return 0; 52732cf86f6SMauro Carvalho Chehab } 52832cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_close); 52932cf86f6SMauro Carvalho Chehab 53032cf86f6SMauro Carvalho Chehab unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) 53132cf86f6SMauro Carvalho Chehab { 532496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 53332cf86f6SMauro Carvalho Chehab unsigned int ret; 53432cf86f6SMauro Carvalho Chehab 53532cf86f6SMauro Carvalho Chehab if (!ir) { 5363fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 53732cf86f6SMauro Carvalho Chehab return POLLERR; 53832cf86f6SMauro Carvalho Chehab } 53932cf86f6SMauro Carvalho Chehab 54032cf86f6SMauro Carvalho Chehab if (!ir->attached) 54132cf86f6SMauro Carvalho Chehab return POLLERR; 54232cf86f6SMauro Carvalho Chehab 5433656cdddSAndy Shevchenko if (ir->buf) { 54432cf86f6SMauro Carvalho Chehab poll_wait(file, &ir->buf->wait_poll, wait); 54532cf86f6SMauro Carvalho Chehab 54632cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) 54732cf86f6SMauro Carvalho Chehab ret = 0; 54832cf86f6SMauro Carvalho Chehab else 54932cf86f6SMauro Carvalho Chehab ret = POLLIN | POLLRDNORM; 5503656cdddSAndy Shevchenko } else 55132cf86f6SMauro Carvalho Chehab ret = POLLERR; 55232cf86f6SMauro Carvalho Chehab 55332cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", 55432cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, ret); 55532cf86f6SMauro Carvalho Chehab 55632cf86f6SMauro Carvalho Chehab return ret; 55732cf86f6SMauro Carvalho Chehab } 55832cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_poll); 55932cf86f6SMauro Carvalho Chehab 56032cf86f6SMauro Carvalho Chehab long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 56132cf86f6SMauro Carvalho Chehab { 56232cf86f6SMauro Carvalho Chehab __u32 mode; 56332cf86f6SMauro Carvalho Chehab int result = 0; 564496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 56532cf86f6SMauro Carvalho Chehab 56632cf86f6SMauro Carvalho Chehab if (!ir) { 5673fac0314SAndi Shyti pr_err("no irctl found!\n"); 56832cf86f6SMauro Carvalho Chehab return -ENODEV; 56932cf86f6SMauro Carvalho Chehab } 57032cf86f6SMauro Carvalho Chehab 57132cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", 57232cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, cmd); 57332cf86f6SMauro Carvalho Chehab 57432cf86f6SMauro Carvalho Chehab if (ir->d.minor == NOPLUG || !ir->attached) { 5753fac0314SAndi Shyti dev_err(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", 57632cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 57732cf86f6SMauro Carvalho Chehab return -ENODEV; 57832cf86f6SMauro Carvalho Chehab } 57932cf86f6SMauro Carvalho Chehab 58032cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 58132cf86f6SMauro Carvalho Chehab 58232cf86f6SMauro Carvalho Chehab switch (cmd) { 58332cf86f6SMauro Carvalho Chehab case LIRC_GET_FEATURES: 58460519af3SHans Verkuil result = put_user(ir->d.features, (__u32 __user *)arg); 58532cf86f6SMauro Carvalho Chehab break; 58632cf86f6SMauro Carvalho Chehab case LIRC_GET_REC_MODE: 58732cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_REC_MASK)) { 588b4088094SAndi Shyti result = -ENOTTY; 58932cf86f6SMauro Carvalho Chehab break; 59032cf86f6SMauro Carvalho Chehab } 59132cf86f6SMauro Carvalho Chehab 59232cf86f6SMauro Carvalho Chehab result = put_user(LIRC_REC2MODE 59332cf86f6SMauro Carvalho Chehab (ir->d.features & LIRC_CAN_REC_MASK), 59460519af3SHans Verkuil (__u32 __user *)arg); 59532cf86f6SMauro Carvalho Chehab break; 59632cf86f6SMauro Carvalho Chehab case LIRC_SET_REC_MODE: 59732cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_REC_MASK)) { 598b4088094SAndi Shyti result = -ENOTTY; 59932cf86f6SMauro Carvalho Chehab break; 60032cf86f6SMauro Carvalho Chehab } 60132cf86f6SMauro Carvalho Chehab 60260519af3SHans Verkuil result = get_user(mode, (__u32 __user *)arg); 60332cf86f6SMauro Carvalho Chehab if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) 60432cf86f6SMauro Carvalho Chehab result = -EINVAL; 60532cf86f6SMauro Carvalho Chehab /* 60632cf86f6SMauro Carvalho Chehab * FIXME: We should actually set the mode somehow but 60732cf86f6SMauro Carvalho Chehab * for now, lirc_serial doesn't support mode changing either 60832cf86f6SMauro Carvalho Chehab */ 60932cf86f6SMauro Carvalho Chehab break; 61032cf86f6SMauro Carvalho Chehab case LIRC_GET_LENGTH: 61160519af3SHans Verkuil result = put_user(ir->d.code_length, (__u32 __user *)arg); 61232cf86f6SMauro Carvalho Chehab break; 61332cf86f6SMauro Carvalho Chehab case LIRC_GET_MIN_TIMEOUT: 61432cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 61532cf86f6SMauro Carvalho Chehab ir->d.min_timeout == 0) { 616b4088094SAndi Shyti result = -ENOTTY; 61732cf86f6SMauro Carvalho Chehab break; 61832cf86f6SMauro Carvalho Chehab } 61932cf86f6SMauro Carvalho Chehab 62060519af3SHans Verkuil result = put_user(ir->d.min_timeout, (__u32 __user *)arg); 62132cf86f6SMauro Carvalho Chehab break; 62232cf86f6SMauro Carvalho Chehab case LIRC_GET_MAX_TIMEOUT: 62332cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 62432cf86f6SMauro Carvalho Chehab ir->d.max_timeout == 0) { 625b4088094SAndi Shyti result = -ENOTTY; 62632cf86f6SMauro Carvalho Chehab break; 62732cf86f6SMauro Carvalho Chehab } 62832cf86f6SMauro Carvalho Chehab 62960519af3SHans Verkuil result = put_user(ir->d.max_timeout, (__u32 __user *)arg); 63032cf86f6SMauro Carvalho Chehab break; 63132cf86f6SMauro Carvalho Chehab default: 63232cf86f6SMauro Carvalho Chehab result = -EINVAL; 63332cf86f6SMauro Carvalho Chehab } 63432cf86f6SMauro Carvalho Chehab 63532cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 63632cf86f6SMauro Carvalho Chehab 63732cf86f6SMauro Carvalho Chehab return result; 63832cf86f6SMauro Carvalho Chehab } 63932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_ioctl); 64032cf86f6SMauro Carvalho Chehab 64132cf86f6SMauro Carvalho Chehab ssize_t lirc_dev_fop_read(struct file *file, 6420e835087SDan Carpenter char __user *buffer, 64332cf86f6SMauro Carvalho Chehab size_t length, 64432cf86f6SMauro Carvalho Chehab loff_t *ppos) 64532cf86f6SMauro Carvalho Chehab { 646496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 64732cf86f6SMauro Carvalho Chehab unsigned char *buf; 64832cf86f6SMauro Carvalho Chehab int ret = 0, written = 0; 64932cf86f6SMauro Carvalho Chehab DECLARE_WAITQUEUE(wait, current); 65032cf86f6SMauro Carvalho Chehab 65132cf86f6SMauro Carvalho Chehab if (!ir) { 6523fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 65332cf86f6SMauro Carvalho Chehab return -ENODEV; 65432cf86f6SMauro Carvalho Chehab } 65532cf86f6SMauro Carvalho Chehab 65632cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); 65732cf86f6SMauro Carvalho Chehab 65832cf86f6SMauro Carvalho Chehab buf = kzalloc(ir->chunk_size, GFP_KERNEL); 65932cf86f6SMauro Carvalho Chehab if (!buf) 66032cf86f6SMauro Carvalho Chehab return -ENOMEM; 66132cf86f6SMauro Carvalho Chehab 66232cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 66332cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 66432cf86f6SMauro Carvalho Chehab goto out_unlocked; 66532cf86f6SMauro Carvalho Chehab } 66632cf86f6SMauro Carvalho Chehab if (!ir->attached) { 66732cf86f6SMauro Carvalho Chehab ret = -ENODEV; 66832cf86f6SMauro Carvalho Chehab goto out_locked; 66932cf86f6SMauro Carvalho Chehab } 67032cf86f6SMauro Carvalho Chehab 67132cf86f6SMauro Carvalho Chehab if (length % ir->chunk_size) { 67232cf86f6SMauro Carvalho Chehab ret = -EINVAL; 67332cf86f6SMauro Carvalho Chehab goto out_locked; 67432cf86f6SMauro Carvalho Chehab } 67532cf86f6SMauro Carvalho Chehab 67632cf86f6SMauro Carvalho Chehab /* 67732cf86f6SMauro Carvalho Chehab * we add ourselves to the task queue before buffer check 67832cf86f6SMauro Carvalho Chehab * to avoid losing scan code (in case when queue is awaken somewhere 67932cf86f6SMauro Carvalho Chehab * between while condition checking and scheduling) 68032cf86f6SMauro Carvalho Chehab */ 68132cf86f6SMauro Carvalho Chehab add_wait_queue(&ir->buf->wait_poll, &wait); 68232cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 68332cf86f6SMauro Carvalho Chehab 68432cf86f6SMauro Carvalho Chehab /* 68532cf86f6SMauro Carvalho Chehab * while we didn't provide 'length' bytes, device is opened in blocking 68632cf86f6SMauro Carvalho Chehab * mode and 'copy_to_user' is happy, wait for data. 68732cf86f6SMauro Carvalho Chehab */ 68832cf86f6SMauro Carvalho Chehab while (written < length && ret == 0) { 68932cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) { 69032cf86f6SMauro Carvalho Chehab /* According to the read(2) man page, 'written' can be 69132cf86f6SMauro Carvalho Chehab * returned as less than 'length', instead of blocking 69232cf86f6SMauro Carvalho Chehab * again, returning -EWOULDBLOCK, or returning 69362e92682SAndi Shyti * -ERESTARTSYS 69462e92682SAndi Shyti */ 69532cf86f6SMauro Carvalho Chehab if (written) 69632cf86f6SMauro Carvalho Chehab break; 69732cf86f6SMauro Carvalho Chehab if (file->f_flags & O_NONBLOCK) { 69832cf86f6SMauro Carvalho Chehab ret = -EWOULDBLOCK; 69932cf86f6SMauro Carvalho Chehab break; 70032cf86f6SMauro Carvalho Chehab } 70132cf86f6SMauro Carvalho Chehab if (signal_pending(current)) { 70232cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 70332cf86f6SMauro Carvalho Chehab break; 70432cf86f6SMauro Carvalho Chehab } 70532cf86f6SMauro Carvalho Chehab 70632cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 70732cf86f6SMauro Carvalho Chehab schedule(); 70832cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 70932cf86f6SMauro Carvalho Chehab 71032cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 71132cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 71232cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 71332cf86f6SMauro Carvalho Chehab set_current_state(TASK_RUNNING); 71432cf86f6SMauro Carvalho Chehab goto out_unlocked; 71532cf86f6SMauro Carvalho Chehab } 71632cf86f6SMauro Carvalho Chehab 71732cf86f6SMauro Carvalho Chehab if (!ir->attached) { 71832cf86f6SMauro Carvalho Chehab ret = -ENODEV; 71932cf86f6SMauro Carvalho Chehab break; 72032cf86f6SMauro Carvalho Chehab } 72132cf86f6SMauro Carvalho Chehab } else { 72232cf86f6SMauro Carvalho Chehab lirc_buffer_read(ir->buf, buf); 72360519af3SHans Verkuil ret = copy_to_user((void __user *)buffer+written, buf, 72432cf86f6SMauro Carvalho Chehab ir->buf->chunk_size); 72532cf86f6SMauro Carvalho Chehab if (!ret) 72632cf86f6SMauro Carvalho Chehab written += ir->buf->chunk_size; 72732cf86f6SMauro Carvalho Chehab else 72832cf86f6SMauro Carvalho Chehab ret = -EFAULT; 72932cf86f6SMauro Carvalho Chehab } 73032cf86f6SMauro Carvalho Chehab } 73132cf86f6SMauro Carvalho Chehab 73232cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 73332cf86f6SMauro Carvalho Chehab set_current_state(TASK_RUNNING); 73432cf86f6SMauro Carvalho Chehab 73532cf86f6SMauro Carvalho Chehab out_locked: 73632cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 73732cf86f6SMauro Carvalho Chehab 73832cf86f6SMauro Carvalho Chehab out_unlocked: 73932cf86f6SMauro Carvalho Chehab kfree(buf); 74032cf86f6SMauro Carvalho Chehab 74132cf86f6SMauro Carvalho Chehab return ret ? ret : written; 74232cf86f6SMauro Carvalho Chehab } 74332cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_read); 74432cf86f6SMauro Carvalho Chehab 74532cf86f6SMauro Carvalho Chehab void *lirc_get_pdata(struct file *file) 74632cf86f6SMauro Carvalho Chehab { 7470990a97aSAl Viro return irctls[iminor(file_inode(file))]->d.data; 74832cf86f6SMauro Carvalho Chehab } 74932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_get_pdata); 75032cf86f6SMauro Carvalho Chehab 75132cf86f6SMauro Carvalho Chehab 7520e835087SDan Carpenter ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer, 75332cf86f6SMauro Carvalho Chehab size_t length, loff_t *ppos) 75432cf86f6SMauro Carvalho Chehab { 755496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 75632cf86f6SMauro Carvalho Chehab 75732cf86f6SMauro Carvalho Chehab if (!ir) { 7583fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 75932cf86f6SMauro Carvalho Chehab return -ENODEV; 76032cf86f6SMauro Carvalho Chehab } 76132cf86f6SMauro Carvalho Chehab 76232cf86f6SMauro Carvalho Chehab if (!ir->attached) 76332cf86f6SMauro Carvalho Chehab return -ENODEV; 76432cf86f6SMauro Carvalho Chehab 76532cf86f6SMauro Carvalho Chehab return -EINVAL; 76632cf86f6SMauro Carvalho Chehab } 76732cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_write); 76832cf86f6SMauro Carvalho Chehab 76932cf86f6SMauro Carvalho Chehab 77032cf86f6SMauro Carvalho Chehab static int __init lirc_dev_init(void) 77132cf86f6SMauro Carvalho Chehab { 77232cf86f6SMauro Carvalho Chehab int retval; 77332cf86f6SMauro Carvalho Chehab 77432cf86f6SMauro Carvalho Chehab lirc_class = class_create(THIS_MODULE, "lirc"); 77532cf86f6SMauro Carvalho Chehab if (IS_ERR(lirc_class)) { 7763fac0314SAndi Shyti pr_err("class_create failed\n"); 77754fcecafSAndi Shyti return PTR_ERR(lirc_class); 77832cf86f6SMauro Carvalho Chehab } 77932cf86f6SMauro Carvalho Chehab 78032cf86f6SMauro Carvalho Chehab retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, 78132cf86f6SMauro Carvalho Chehab IRCTL_DEV_NAME); 78232cf86f6SMauro Carvalho Chehab if (retval) { 78332cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 7843fac0314SAndi Shyti pr_err("alloc_chrdev_region failed\n"); 78554fcecafSAndi Shyti return retval; 78632cf86f6SMauro Carvalho Chehab } 78732cf86f6SMauro Carvalho Chehab 78832cf86f6SMauro Carvalho Chehab 7893fac0314SAndi Shyti pr_info("IR Remote Control driver registered, major %d\n", 7903fac0314SAndi Shyti MAJOR(lirc_base_dev)); 79132cf86f6SMauro Carvalho Chehab 79254fcecafSAndi Shyti return 0; 79332cf86f6SMauro Carvalho Chehab } 79432cf86f6SMauro Carvalho Chehab 79532cf86f6SMauro Carvalho Chehab 79632cf86f6SMauro Carvalho Chehab 79732cf86f6SMauro Carvalho Chehab static void __exit lirc_dev_exit(void) 79832cf86f6SMauro Carvalho Chehab { 79932cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 80032cf86f6SMauro Carvalho Chehab unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); 8013fac0314SAndi Shyti pr_info("module unloaded\n"); 80232cf86f6SMauro Carvalho Chehab } 80332cf86f6SMauro Carvalho Chehab 80432cf86f6SMauro Carvalho Chehab module_init(lirc_dev_init); 80532cf86f6SMauro Carvalho Chehab module_exit(lirc_dev_exit); 80632cf86f6SMauro Carvalho Chehab 80732cf86f6SMauro Carvalho Chehab MODULE_DESCRIPTION("LIRC base driver module"); 80832cf86f6SMauro Carvalho Chehab MODULE_AUTHOR("Artur Lipowski"); 80932cf86f6SMauro Carvalho Chehab MODULE_LICENSE("GPL"); 81032cf86f6SMauro Carvalho Chehab 81132cf86f6SMauro Carvalho Chehab module_param(debug, bool, S_IRUGO | S_IWUSR); 81232cf86f6SMauro Carvalho Chehab MODULE_PARM_DESC(debug, "Enable debugging messages"); 813