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 { 10032cf86f6SMauro Carvalho Chehab if (ir->d.add_to_buf) { 10132cf86f6SMauro Carvalho Chehab int res = -ENODATA; 1027fe579d2SAndi Shyti int got_data = -1; 10332cf86f6SMauro Carvalho Chehab 10432cf86f6SMauro Carvalho Chehab /* 10532cf86f6SMauro Carvalho Chehab * service the device as long as it is returning 10632cf86f6SMauro Carvalho Chehab * data and we have space 10732cf86f6SMauro Carvalho Chehab */ 1087fe579d2SAndi Shyti do { 10932cf86f6SMauro Carvalho Chehab got_data++; 1107fe579d2SAndi Shyti res = ir->d.add_to_buf(ir->d.data, ir->buf); 1117fe579d2SAndi Shyti } while (!res); 11232cf86f6SMauro Carvalho Chehab 11332cf86f6SMauro Carvalho Chehab if (res == -ENODEV) 11432cf86f6SMauro Carvalho Chehab kthread_stop(ir->task); 11532cf86f6SMauro Carvalho Chehab 11632cf86f6SMauro Carvalho Chehab return got_data ? 0 : res; 11732cf86f6SMauro Carvalho Chehab } 11832cf86f6SMauro Carvalho Chehab 11932cf86f6SMauro Carvalho Chehab return 0; 12032cf86f6SMauro Carvalho Chehab } 12132cf86f6SMauro Carvalho Chehab 12232cf86f6SMauro Carvalho Chehab /* main function of the polling thread 12332cf86f6SMauro Carvalho Chehab */ 12432cf86f6SMauro Carvalho Chehab static int lirc_thread(void *irctl) 12532cf86f6SMauro Carvalho Chehab { 12632cf86f6SMauro Carvalho Chehab struct irctl *ir = irctl; 12732cf86f6SMauro Carvalho Chehab 12832cf86f6SMauro Carvalho Chehab do { 12932cf86f6SMauro Carvalho Chehab if (ir->open) { 13032cf86f6SMauro Carvalho Chehab if (ir->jiffies_to_wait) { 13132cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 13232cf86f6SMauro Carvalho Chehab schedule_timeout(ir->jiffies_to_wait); 13332cf86f6SMauro Carvalho Chehab } 13432cf86f6SMauro Carvalho Chehab if (kthread_should_stop()) 13532cf86f6SMauro Carvalho Chehab break; 13632cf86f6SMauro Carvalho Chehab if (!lirc_add_to_buf(ir)) 13732cf86f6SMauro Carvalho Chehab wake_up_interruptible(&ir->buf->wait_poll); 13832cf86f6SMauro Carvalho Chehab } else { 13932cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 14032cf86f6SMauro Carvalho Chehab schedule(); 14132cf86f6SMauro Carvalho Chehab } 14232cf86f6SMauro Carvalho Chehab } while (!kthread_should_stop()); 14332cf86f6SMauro Carvalho Chehab 14432cf86f6SMauro Carvalho Chehab return 0; 14532cf86f6SMauro Carvalho Chehab } 14632cf86f6SMauro Carvalho Chehab 14732cf86f6SMauro Carvalho Chehab 14875ef9de1SAl Viro static const struct file_operations lirc_dev_fops = { 14932cf86f6SMauro Carvalho Chehab .owner = THIS_MODULE, 15032cf86f6SMauro Carvalho Chehab .read = lirc_dev_fop_read, 15132cf86f6SMauro Carvalho Chehab .write = lirc_dev_fop_write, 15232cf86f6SMauro Carvalho Chehab .poll = lirc_dev_fop_poll, 15332cf86f6SMauro Carvalho Chehab .unlocked_ioctl = lirc_dev_fop_ioctl, 15432cf86f6SMauro Carvalho Chehab #ifdef CONFIG_COMPAT 15532cf86f6SMauro Carvalho Chehab .compat_ioctl = lirc_dev_fop_ioctl, 15632cf86f6SMauro Carvalho Chehab #endif 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 { 1648de111e2SJarod Wilson int retval = -ENOMEM; 16532cf86f6SMauro Carvalho Chehab struct lirc_driver *d = &ir->d; 1668de111e2SJarod Wilson struct cdev *cdev; 1678de111e2SJarod Wilson 1688de111e2SJarod Wilson cdev = kzalloc(sizeof(*cdev), GFP_KERNEL); 1698de111e2SJarod Wilson if (!cdev) 1708de111e2SJarod Wilson goto err_out; 17132cf86f6SMauro Carvalho Chehab 17232cf86f6SMauro Carvalho Chehab if (d->fops) { 17332cf86f6SMauro Carvalho Chehab cdev_init(cdev, d->fops); 17432cf86f6SMauro Carvalho Chehab cdev->owner = d->owner; 17532cf86f6SMauro Carvalho Chehab } else { 17632cf86f6SMauro Carvalho Chehab cdev_init(cdev, &lirc_dev_fops); 17732cf86f6SMauro Carvalho Chehab cdev->owner = THIS_MODULE; 17832cf86f6SMauro Carvalho Chehab } 179b395cbacSVasiliy Kulikov retval = kobject_set_name(&cdev->kobj, "lirc%d", d->minor); 180b395cbacSVasiliy Kulikov if (retval) 1818de111e2SJarod Wilson goto err_out; 18232cf86f6SMauro Carvalho Chehab 18332cf86f6SMauro Carvalho Chehab retval = cdev_add(cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1); 1848de111e2SJarod Wilson if (retval) { 18532cf86f6SMauro Carvalho Chehab kobject_put(&cdev->kobj); 1868de111e2SJarod Wilson goto err_out; 1878de111e2SJarod Wilson } 18832cf86f6SMauro Carvalho Chehab 1898de111e2SJarod Wilson ir->cdev = cdev; 1908de111e2SJarod Wilson 1918de111e2SJarod Wilson return 0; 1928de111e2SJarod Wilson 1938de111e2SJarod Wilson err_out: 1948de111e2SJarod Wilson kfree(cdev); 19532cf86f6SMauro Carvalho Chehab return retval; 19632cf86f6SMauro Carvalho Chehab } 19732cf86f6SMauro Carvalho Chehab 1986fa99e1aSAndi Shyti static int lirc_allocate_buffer(struct irctl *ir) 1996fa99e1aSAndi Shyti { 20070143984SAndi Shyti int err = 0; 2016fa99e1aSAndi Shyti int bytes_in_key; 2026fa99e1aSAndi Shyti unsigned int chunk_size; 2036fa99e1aSAndi Shyti unsigned int buffer_size; 2046fa99e1aSAndi Shyti struct lirc_driver *d = &ir->d; 2056fa99e1aSAndi Shyti 20670143984SAndi Shyti mutex_lock(&lirc_dev_lock); 20770143984SAndi Shyti 2086fa99e1aSAndi Shyti bytes_in_key = BITS_TO_LONGS(d->code_length) + 2096fa99e1aSAndi Shyti (d->code_length % 8 ? 1 : 0); 2106fa99e1aSAndi Shyti buffer_size = d->buffer_size ? d->buffer_size : BUFLEN / bytes_in_key; 2116fa99e1aSAndi Shyti chunk_size = d->chunk_size ? d->chunk_size : bytes_in_key; 2126fa99e1aSAndi Shyti 2136fa99e1aSAndi Shyti if (d->rbuf) { 2146fa99e1aSAndi Shyti ir->buf = d->rbuf; 2156fa99e1aSAndi Shyti } else { 2166fa99e1aSAndi Shyti ir->buf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL); 21770143984SAndi Shyti if (!ir->buf) { 21870143984SAndi Shyti err = -ENOMEM; 21970143984SAndi Shyti goto out; 22070143984SAndi Shyti } 2216fa99e1aSAndi Shyti 2226fa99e1aSAndi Shyti err = lirc_buffer_init(ir->buf, chunk_size, buffer_size); 2236fa99e1aSAndi Shyti if (err) { 2246fa99e1aSAndi Shyti kfree(ir->buf); 22570143984SAndi Shyti goto out; 2266fa99e1aSAndi Shyti } 2276fa99e1aSAndi Shyti } 2286fa99e1aSAndi Shyti ir->chunk_size = ir->buf->chunk_size; 2296fa99e1aSAndi Shyti 23070143984SAndi Shyti out: 23170143984SAndi Shyti mutex_unlock(&lirc_dev_lock); 23270143984SAndi Shyti 23370143984SAndi Shyti return err; 2346fa99e1aSAndi Shyti } 2356fa99e1aSAndi Shyti 23670143984SAndi Shyti static int lirc_allocate_driver(struct lirc_driver *d) 23732cf86f6SMauro Carvalho Chehab { 23832cf86f6SMauro Carvalho Chehab struct irctl *ir; 23932cf86f6SMauro Carvalho Chehab int minor; 24032cf86f6SMauro Carvalho Chehab int err; 24132cf86f6SMauro Carvalho Chehab 24232cf86f6SMauro Carvalho Chehab if (!d) { 2433fac0314SAndi Shyti pr_err("driver pointer must be not NULL!\n"); 24454fcecafSAndi Shyti return -EBADRQC; 24532cf86f6SMauro Carvalho Chehab } 24632cf86f6SMauro Carvalho Chehab 24732cf86f6SMauro Carvalho Chehab if (!d->dev) { 2483fac0314SAndi Shyti pr_err("dev pointer not filled in!\n"); 24954fcecafSAndi Shyti return -EINVAL; 25032cf86f6SMauro Carvalho Chehab } 25132cf86f6SMauro Carvalho Chehab 25232cf86f6SMauro Carvalho Chehab if (MAX_IRCTL_DEVICES <= d->minor) { 2533fac0314SAndi Shyti dev_err(d->dev, "minor must be between 0 and %d!\n", 2543fac0314SAndi Shyti MAX_IRCTL_DEVICES - 1); 25554fcecafSAndi Shyti return -EBADRQC; 25632cf86f6SMauro Carvalho Chehab } 25732cf86f6SMauro Carvalho Chehab 25832cf86f6SMauro Carvalho Chehab if (1 > d->code_length || (BUFLEN * 8) < d->code_length) { 2593fac0314SAndi Shyti dev_err(d->dev, "code length must be less than %d bits\n", 2603fac0314SAndi Shyti BUFLEN * 8); 26154fcecafSAndi Shyti return -EBADRQC; 26232cf86f6SMauro Carvalho Chehab } 26332cf86f6SMauro Carvalho Chehab 26432cf86f6SMauro Carvalho Chehab if (d->sample_rate) { 26532cf86f6SMauro Carvalho Chehab if (2 > d->sample_rate || HZ < d->sample_rate) { 2663fac0314SAndi Shyti dev_err(d->dev, "invalid %d sample rate\n", 2673fac0314SAndi Shyti d->sample_rate); 26854fcecafSAndi Shyti return -EBADRQC; 26932cf86f6SMauro Carvalho Chehab } 27032cf86f6SMauro Carvalho Chehab if (!d->add_to_buf) { 2713fac0314SAndi Shyti dev_err(d->dev, "add_to_buf not set\n"); 27254fcecafSAndi Shyti return -EBADRQC; 27332cf86f6SMauro Carvalho Chehab } 27432cf86f6SMauro Carvalho Chehab } else if (!(d->fops && d->fops->read) && !d->rbuf) { 2753fac0314SAndi Shyti dev_err(d->dev, "fops->read and rbuf are NULL!\n"); 27654fcecafSAndi Shyti return -EBADRQC; 27732cf86f6SMauro Carvalho Chehab } else if (!d->rbuf) { 27832cf86f6SMauro Carvalho Chehab if (!(d->fops && d->fops->read && d->fops->poll && 27932cf86f6SMauro Carvalho Chehab d->fops->unlocked_ioctl)) { 2803fac0314SAndi Shyti dev_err(d->dev, "undefined read, poll, ioctl\n"); 28154fcecafSAndi Shyti return -EBADRQC; 28232cf86f6SMauro Carvalho Chehab } 28332cf86f6SMauro Carvalho Chehab } 28432cf86f6SMauro Carvalho Chehab 28532cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 28632cf86f6SMauro Carvalho Chehab 28732cf86f6SMauro Carvalho Chehab minor = d->minor; 28832cf86f6SMauro Carvalho Chehab 28932cf86f6SMauro Carvalho Chehab if (minor < 0) { 29032cf86f6SMauro Carvalho Chehab /* find first free slot for driver */ 29132cf86f6SMauro Carvalho Chehab for (minor = 0; minor < MAX_IRCTL_DEVICES; minor++) 29232cf86f6SMauro Carvalho Chehab if (!irctls[minor]) 29332cf86f6SMauro Carvalho Chehab break; 29432cf86f6SMauro Carvalho Chehab if (MAX_IRCTL_DEVICES == minor) { 2953fac0314SAndi Shyti dev_err(d->dev, "no free slots for drivers!\n"); 29632cf86f6SMauro Carvalho Chehab err = -ENOMEM; 29732cf86f6SMauro Carvalho Chehab goto out_lock; 29832cf86f6SMauro Carvalho Chehab } 29932cf86f6SMauro Carvalho Chehab } else if (irctls[minor]) { 3003fac0314SAndi Shyti dev_err(d->dev, "minor (%d) just registered!\n", minor); 30132cf86f6SMauro Carvalho Chehab err = -EBUSY; 30232cf86f6SMauro Carvalho Chehab goto out_lock; 30332cf86f6SMauro Carvalho Chehab } 30432cf86f6SMauro Carvalho Chehab 30532cf86f6SMauro Carvalho Chehab ir = kzalloc(sizeof(struct irctl), GFP_KERNEL); 30632cf86f6SMauro Carvalho Chehab if (!ir) { 30732cf86f6SMauro Carvalho Chehab err = -ENOMEM; 30832cf86f6SMauro Carvalho Chehab goto out_lock; 30932cf86f6SMauro Carvalho Chehab } 31032cf86f6SMauro Carvalho Chehab lirc_irctl_init(ir); 31132cf86f6SMauro Carvalho Chehab irctls[minor] = ir; 31232cf86f6SMauro Carvalho Chehab d->minor = minor; 31332cf86f6SMauro Carvalho Chehab 31432cf86f6SMauro Carvalho Chehab if (d->sample_rate) { 31532cf86f6SMauro Carvalho Chehab ir->jiffies_to_wait = HZ / d->sample_rate; 31632cf86f6SMauro Carvalho Chehab } else { 31732cf86f6SMauro Carvalho Chehab /* it means - wait for external event in task queue */ 31832cf86f6SMauro Carvalho Chehab ir->jiffies_to_wait = 0; 31932cf86f6SMauro Carvalho Chehab } 32032cf86f6SMauro Carvalho Chehab 32132cf86f6SMauro Carvalho Chehab /* some safety check 8-) */ 32232cf86f6SMauro Carvalho Chehab d->name[sizeof(d->name)-1] = '\0'; 32332cf86f6SMauro Carvalho Chehab 32432cf86f6SMauro Carvalho Chehab if (d->features == 0) 32532cf86f6SMauro Carvalho Chehab d->features = LIRC_CAN_REC_LIRCCODE; 32632cf86f6SMauro Carvalho Chehab 32732cf86f6SMauro Carvalho Chehab ir->d = *d; 32832cf86f6SMauro Carvalho Chehab 32932cf86f6SMauro Carvalho Chehab device_create(lirc_class, ir->d.dev, 33032cf86f6SMauro Carvalho Chehab MKDEV(MAJOR(lirc_base_dev), ir->d.minor), NULL, 33132cf86f6SMauro Carvalho Chehab "lirc%u", ir->d.minor); 33232cf86f6SMauro Carvalho Chehab 33332cf86f6SMauro Carvalho Chehab if (d->sample_rate) { 33432cf86f6SMauro Carvalho Chehab /* try to fire up polling thread */ 33532cf86f6SMauro Carvalho Chehab ir->task = kthread_run(lirc_thread, (void *)ir, "lirc_dev"); 33632cf86f6SMauro Carvalho Chehab if (IS_ERR(ir->task)) { 3373fac0314SAndi Shyti dev_err(d->dev, "cannot run thread for minor = %d\n", 33832cf86f6SMauro Carvalho Chehab d->minor); 33932cf86f6SMauro Carvalho Chehab err = -ECHILD; 34032cf86f6SMauro Carvalho Chehab goto out_sysfs; 34132cf86f6SMauro Carvalho Chehab } 34232cf86f6SMauro Carvalho Chehab } 34332cf86f6SMauro Carvalho Chehab 34432cf86f6SMauro Carvalho Chehab err = lirc_cdev_add(ir); 34532cf86f6SMauro Carvalho Chehab if (err) 34632cf86f6SMauro Carvalho Chehab goto out_sysfs; 34732cf86f6SMauro Carvalho Chehab 34832cf86f6SMauro Carvalho Chehab ir->attached = 1; 34932cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 35032cf86f6SMauro Carvalho Chehab 35132cf86f6SMauro Carvalho Chehab dev_info(ir->d.dev, "lirc_dev: driver %s registered at minor = %d\n", 35232cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 35332cf86f6SMauro Carvalho Chehab return minor; 35432cf86f6SMauro Carvalho Chehab 35532cf86f6SMauro Carvalho Chehab out_sysfs: 35632cf86f6SMauro Carvalho Chehab device_destroy(lirc_class, MKDEV(MAJOR(lirc_base_dev), ir->d.minor)); 35732cf86f6SMauro Carvalho Chehab out_lock: 35832cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 35954fcecafSAndi Shyti 36032cf86f6SMauro Carvalho Chehab return err; 36132cf86f6SMauro Carvalho Chehab } 36270143984SAndi Shyti 36370143984SAndi Shyti int lirc_register_driver(struct lirc_driver *d) 36470143984SAndi Shyti { 36570143984SAndi Shyti int minor, err = 0; 36670143984SAndi Shyti 36770143984SAndi Shyti minor = lirc_allocate_driver(d); 36870143984SAndi Shyti if (minor < 0) 36970143984SAndi Shyti return minor; 37070143984SAndi Shyti 37170143984SAndi Shyti if (LIRC_CAN_REC(d->features)) { 37270143984SAndi Shyti err = lirc_allocate_buffer(irctls[minor]); 37370143984SAndi Shyti if (err) 37470143984SAndi Shyti lirc_unregister_driver(minor); 37570143984SAndi Shyti } 37670143984SAndi Shyti 37770143984SAndi Shyti return err ? err : minor; 37870143984SAndi Shyti } 37932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_register_driver); 38032cf86f6SMauro Carvalho Chehab 38132cf86f6SMauro Carvalho Chehab int lirc_unregister_driver(int minor) 38232cf86f6SMauro Carvalho Chehab { 38332cf86f6SMauro Carvalho Chehab struct irctl *ir; 38432cf86f6SMauro Carvalho Chehab struct cdev *cdev; 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 3988de111e2SJarod Wilson cdev = ir->cdev; 39932cf86f6SMauro Carvalho Chehab 40032cf86f6SMauro Carvalho Chehab mutex_lock(&lirc_dev_lock); 40132cf86f6SMauro Carvalho Chehab 40232cf86f6SMauro Carvalho Chehab if (ir->d.minor != minor) { 4033fac0314SAndi Shyti dev_err(ir->d.dev, "lirc_dev: minor %d device not registered\n", 4043fac0314SAndi Shyti minor); 40532cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 40632cf86f6SMauro Carvalho Chehab return -ENOENT; 40732cf86f6SMauro Carvalho Chehab } 40832cf86f6SMauro Carvalho Chehab 40932cf86f6SMauro Carvalho Chehab /* end up polling thread */ 41032cf86f6SMauro Carvalho Chehab if (ir->task) 41132cf86f6SMauro Carvalho Chehab kthread_stop(ir->task); 41232cf86f6SMauro Carvalho Chehab 41332cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, "lirc_dev: driver %s unregistered from minor = %d\n", 41432cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 41532cf86f6SMauro Carvalho Chehab 41632cf86f6SMauro Carvalho Chehab ir->attached = 0; 41732cf86f6SMauro Carvalho Chehab if (ir->open) { 41832cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "releasing opened driver\n", 41932cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 42032cf86f6SMauro Carvalho Chehab wake_up_interruptible(&ir->buf->wait_poll); 42132cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 42232cf86f6SMauro Carvalho Chehab ir->d.set_use_dec(ir->d.data); 42332cf86f6SMauro Carvalho Chehab module_put(cdev->owner); 42432cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 42532cf86f6SMauro Carvalho Chehab } else { 42632cf86f6SMauro Carvalho Chehab lirc_irctl_cleanup(ir); 42732cf86f6SMauro Carvalho Chehab cdev_del(cdev); 4288de111e2SJarod Wilson kfree(cdev); 42932cf86f6SMauro Carvalho Chehab kfree(ir); 43032cf86f6SMauro Carvalho Chehab irctls[minor] = NULL; 43132cf86f6SMauro Carvalho Chehab } 43232cf86f6SMauro Carvalho Chehab 43332cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 43432cf86f6SMauro Carvalho Chehab 43532cf86f6SMauro Carvalho Chehab return 0; 43632cf86f6SMauro Carvalho Chehab } 43732cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_unregister_driver); 43832cf86f6SMauro Carvalho Chehab 43932cf86f6SMauro Carvalho Chehab int lirc_dev_fop_open(struct inode *inode, struct file *file) 44032cf86f6SMauro Carvalho Chehab { 44132cf86f6SMauro Carvalho Chehab struct irctl *ir; 44232cf86f6SMauro Carvalho Chehab struct cdev *cdev; 44332cf86f6SMauro Carvalho Chehab int retval = 0; 44432cf86f6SMauro Carvalho Chehab 44532cf86f6SMauro Carvalho Chehab if (iminor(inode) >= MAX_IRCTL_DEVICES) { 4463fac0314SAndi Shyti pr_err("open result for %d is -ENODEV\n", iminor(inode)); 44732cf86f6SMauro Carvalho Chehab return -ENODEV; 44832cf86f6SMauro Carvalho Chehab } 44932cf86f6SMauro Carvalho Chehab 45032cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&lirc_dev_lock)) 45132cf86f6SMauro Carvalho Chehab return -ERESTARTSYS; 45232cf86f6SMauro Carvalho Chehab 45332cf86f6SMauro Carvalho Chehab ir = irctls[iminor(inode)]; 45432cf86f6SMauro Carvalho Chehab if (!ir) { 45532cf86f6SMauro Carvalho Chehab retval = -ENODEV; 45632cf86f6SMauro Carvalho Chehab goto error; 45732cf86f6SMauro Carvalho Chehab } 45832cf86f6SMauro Carvalho Chehab 45932cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); 46032cf86f6SMauro Carvalho Chehab 46132cf86f6SMauro Carvalho Chehab if (ir->d.minor == NOPLUG) { 46232cf86f6SMauro Carvalho Chehab retval = -ENODEV; 46332cf86f6SMauro Carvalho Chehab goto error; 46432cf86f6SMauro Carvalho Chehab } 46532cf86f6SMauro Carvalho Chehab 46632cf86f6SMauro Carvalho Chehab if (ir->open) { 46732cf86f6SMauro Carvalho Chehab retval = -EBUSY; 46832cf86f6SMauro Carvalho Chehab goto error; 46932cf86f6SMauro Carvalho Chehab } 47032cf86f6SMauro Carvalho Chehab 471ca7a722dSSrinivas Kandagatla if (ir->d.rdev) { 472ca7a722dSSrinivas Kandagatla retval = rc_open(ir->d.rdev); 473ca7a722dSSrinivas Kandagatla if (retval) 474ca7a722dSSrinivas Kandagatla goto error; 475ca7a722dSSrinivas Kandagatla } 476ca7a722dSSrinivas Kandagatla 4778de111e2SJarod Wilson cdev = ir->cdev; 47832cf86f6SMauro Carvalho Chehab if (try_module_get(cdev->owner)) { 47932cf86f6SMauro Carvalho Chehab ir->open++; 48032cf86f6SMauro Carvalho Chehab retval = ir->d.set_use_inc(ir->d.data); 48132cf86f6SMauro Carvalho Chehab 48232cf86f6SMauro Carvalho Chehab if (retval) { 48332cf86f6SMauro Carvalho Chehab module_put(cdev->owner); 48432cf86f6SMauro Carvalho Chehab ir->open--; 48532cf86f6SMauro Carvalho Chehab } else { 48632cf86f6SMauro Carvalho Chehab lirc_buffer_clear(ir->buf); 48732cf86f6SMauro Carvalho Chehab } 48832cf86f6SMauro Carvalho Chehab if (ir->task) 48932cf86f6SMauro Carvalho Chehab wake_up_process(ir->task); 49032cf86f6SMauro Carvalho Chehab } 49132cf86f6SMauro Carvalho Chehab 49232cf86f6SMauro Carvalho Chehab error: 49332cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 49432cf86f6SMauro Carvalho Chehab 49532cf86f6SMauro Carvalho Chehab nonseekable_open(inode, file); 49632cf86f6SMauro Carvalho Chehab 49732cf86f6SMauro Carvalho Chehab return retval; 49832cf86f6SMauro Carvalho Chehab } 49932cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_open); 50032cf86f6SMauro Carvalho Chehab 50132cf86f6SMauro Carvalho Chehab int lirc_dev_fop_close(struct inode *inode, struct file *file) 50232cf86f6SMauro Carvalho Chehab { 50332cf86f6SMauro Carvalho Chehab struct irctl *ir = irctls[iminor(inode)]; 5048de111e2SJarod Wilson struct cdev *cdev; 505b64e10f3SMauro Carvalho Chehab int ret; 50632cf86f6SMauro Carvalho Chehab 50732cf86f6SMauro Carvalho Chehab if (!ir) { 5083fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 50932cf86f6SMauro Carvalho Chehab return -EINVAL; 51032cf86f6SMauro Carvalho Chehab } 51132cf86f6SMauro Carvalho Chehab 5128de111e2SJarod Wilson cdev = ir->cdev; 5138de111e2SJarod Wilson 514b64e10f3SMauro Carvalho Chehab ret = mutex_lock_killable(&lirc_dev_lock); 515b64e10f3SMauro Carvalho Chehab WARN_ON(ret); 51632cf86f6SMauro Carvalho Chehab 517ca7a722dSSrinivas Kandagatla rc_close(ir->d.rdev); 518ca7a722dSSrinivas Kandagatla 51932cf86f6SMauro Carvalho Chehab ir->open--; 52032cf86f6SMauro Carvalho Chehab if (ir->attached) { 52132cf86f6SMauro Carvalho Chehab ir->d.set_use_dec(ir->d.data); 52232cf86f6SMauro Carvalho Chehab module_put(cdev->owner); 52332cf86f6SMauro Carvalho Chehab } else { 52432cf86f6SMauro Carvalho Chehab lirc_irctl_cleanup(ir); 52532cf86f6SMauro Carvalho Chehab cdev_del(cdev); 52632cf86f6SMauro Carvalho Chehab irctls[ir->d.minor] = NULL; 5278de111e2SJarod Wilson kfree(cdev); 52832cf86f6SMauro Carvalho Chehab kfree(ir); 52932cf86f6SMauro Carvalho Chehab } 53032cf86f6SMauro Carvalho Chehab 531b64e10f3SMauro Carvalho Chehab if (!ret) 53232cf86f6SMauro Carvalho Chehab mutex_unlock(&lirc_dev_lock); 53332cf86f6SMauro Carvalho Chehab 53432cf86f6SMauro Carvalho Chehab return 0; 53532cf86f6SMauro Carvalho Chehab } 53632cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_close); 53732cf86f6SMauro Carvalho Chehab 53832cf86f6SMauro Carvalho Chehab unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) 53932cf86f6SMauro Carvalho Chehab { 540496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 54132cf86f6SMauro Carvalho Chehab unsigned int ret; 54232cf86f6SMauro Carvalho Chehab 54332cf86f6SMauro Carvalho Chehab if (!ir) { 5443fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 54532cf86f6SMauro Carvalho Chehab return POLLERR; 54632cf86f6SMauro Carvalho Chehab } 54732cf86f6SMauro Carvalho Chehab 54832cf86f6SMauro Carvalho Chehab if (!ir->attached) 54932cf86f6SMauro Carvalho Chehab return POLLERR; 55032cf86f6SMauro Carvalho Chehab 5513656cdddSAndy Shevchenko if (ir->buf) { 55232cf86f6SMauro Carvalho Chehab poll_wait(file, &ir->buf->wait_poll, wait); 55332cf86f6SMauro Carvalho Chehab 55432cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) 55532cf86f6SMauro Carvalho Chehab ret = 0; 55632cf86f6SMauro Carvalho Chehab else 55732cf86f6SMauro Carvalho Chehab ret = POLLIN | POLLRDNORM; 5583656cdddSAndy Shevchenko } else 55932cf86f6SMauro Carvalho Chehab ret = POLLERR; 56032cf86f6SMauro Carvalho Chehab 56132cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "poll result = %d\n", 56232cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, ret); 56332cf86f6SMauro Carvalho Chehab 56432cf86f6SMauro Carvalho Chehab return ret; 56532cf86f6SMauro Carvalho Chehab } 56632cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_poll); 56732cf86f6SMauro Carvalho Chehab 56832cf86f6SMauro Carvalho Chehab long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 56932cf86f6SMauro Carvalho Chehab { 57032cf86f6SMauro Carvalho Chehab __u32 mode; 57132cf86f6SMauro Carvalho Chehab int result = 0; 572496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 57332cf86f6SMauro Carvalho Chehab 57432cf86f6SMauro Carvalho Chehab if (!ir) { 5753fac0314SAndi Shyti pr_err("no irctl found!\n"); 57632cf86f6SMauro Carvalho Chehab return -ENODEV; 57732cf86f6SMauro Carvalho Chehab } 57832cf86f6SMauro Carvalho Chehab 57932cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", 58032cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor, cmd); 58132cf86f6SMauro Carvalho Chehab 58232cf86f6SMauro Carvalho Chehab if (ir->d.minor == NOPLUG || !ir->attached) { 5833fac0314SAndi Shyti dev_err(ir->d.dev, LOGHEAD "ioctl result = -ENODEV\n", 58432cf86f6SMauro Carvalho Chehab ir->d.name, ir->d.minor); 58532cf86f6SMauro Carvalho Chehab return -ENODEV; 58632cf86f6SMauro Carvalho Chehab } 58732cf86f6SMauro Carvalho Chehab 58832cf86f6SMauro Carvalho Chehab mutex_lock(&ir->irctl_lock); 58932cf86f6SMauro Carvalho Chehab 59032cf86f6SMauro Carvalho Chehab switch (cmd) { 59132cf86f6SMauro Carvalho Chehab case LIRC_GET_FEATURES: 59260519af3SHans Verkuil result = put_user(ir->d.features, (__u32 __user *)arg); 59332cf86f6SMauro Carvalho Chehab break; 59432cf86f6SMauro Carvalho Chehab case LIRC_GET_REC_MODE: 59532cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_REC_MASK)) { 59632cf86f6SMauro Carvalho Chehab result = -ENOSYS; 59732cf86f6SMauro Carvalho Chehab break; 59832cf86f6SMauro Carvalho Chehab } 59932cf86f6SMauro Carvalho Chehab 60032cf86f6SMauro Carvalho Chehab result = put_user(LIRC_REC2MODE 60132cf86f6SMauro Carvalho Chehab (ir->d.features & LIRC_CAN_REC_MASK), 60260519af3SHans Verkuil (__u32 __user *)arg); 60332cf86f6SMauro Carvalho Chehab break; 60432cf86f6SMauro Carvalho Chehab case LIRC_SET_REC_MODE: 60532cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_REC_MASK)) { 60632cf86f6SMauro Carvalho Chehab result = -ENOSYS; 60732cf86f6SMauro Carvalho Chehab break; 60832cf86f6SMauro Carvalho Chehab } 60932cf86f6SMauro Carvalho Chehab 61060519af3SHans Verkuil result = get_user(mode, (__u32 __user *)arg); 61132cf86f6SMauro Carvalho Chehab if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) 61232cf86f6SMauro Carvalho Chehab result = -EINVAL; 61332cf86f6SMauro Carvalho Chehab /* 61432cf86f6SMauro Carvalho Chehab * FIXME: We should actually set the mode somehow but 61532cf86f6SMauro Carvalho Chehab * for now, lirc_serial doesn't support mode changing either 61632cf86f6SMauro Carvalho Chehab */ 61732cf86f6SMauro Carvalho Chehab break; 61832cf86f6SMauro Carvalho Chehab case LIRC_GET_LENGTH: 61960519af3SHans Verkuil result = put_user(ir->d.code_length, (__u32 __user *)arg); 62032cf86f6SMauro Carvalho Chehab break; 62132cf86f6SMauro Carvalho Chehab case LIRC_GET_MIN_TIMEOUT: 62232cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 62332cf86f6SMauro Carvalho Chehab ir->d.min_timeout == 0) { 62432cf86f6SMauro Carvalho Chehab result = -ENOSYS; 62532cf86f6SMauro Carvalho Chehab break; 62632cf86f6SMauro Carvalho Chehab } 62732cf86f6SMauro Carvalho Chehab 62860519af3SHans Verkuil result = put_user(ir->d.min_timeout, (__u32 __user *)arg); 62932cf86f6SMauro Carvalho Chehab break; 63032cf86f6SMauro Carvalho Chehab case LIRC_GET_MAX_TIMEOUT: 63132cf86f6SMauro Carvalho Chehab if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || 63232cf86f6SMauro Carvalho Chehab ir->d.max_timeout == 0) { 63332cf86f6SMauro Carvalho Chehab result = -ENOSYS; 63432cf86f6SMauro Carvalho Chehab break; 63532cf86f6SMauro Carvalho Chehab } 63632cf86f6SMauro Carvalho Chehab 63760519af3SHans Verkuil result = put_user(ir->d.max_timeout, (__u32 __user *)arg); 63832cf86f6SMauro Carvalho Chehab break; 63932cf86f6SMauro Carvalho Chehab default: 64032cf86f6SMauro Carvalho Chehab result = -EINVAL; 64132cf86f6SMauro Carvalho Chehab } 64232cf86f6SMauro Carvalho Chehab 64332cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 64432cf86f6SMauro Carvalho Chehab 64532cf86f6SMauro Carvalho Chehab return result; 64632cf86f6SMauro Carvalho Chehab } 64732cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_ioctl); 64832cf86f6SMauro Carvalho Chehab 64932cf86f6SMauro Carvalho Chehab ssize_t lirc_dev_fop_read(struct file *file, 6500e835087SDan Carpenter char __user *buffer, 65132cf86f6SMauro Carvalho Chehab size_t length, 65232cf86f6SMauro Carvalho Chehab loff_t *ppos) 65332cf86f6SMauro Carvalho Chehab { 654496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 65532cf86f6SMauro Carvalho Chehab unsigned char *buf; 65632cf86f6SMauro Carvalho Chehab int ret = 0, written = 0; 65732cf86f6SMauro Carvalho Chehab DECLARE_WAITQUEUE(wait, current); 65832cf86f6SMauro Carvalho Chehab 65932cf86f6SMauro Carvalho Chehab if (!ir) { 6603fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 66132cf86f6SMauro Carvalho Chehab return -ENODEV; 66232cf86f6SMauro Carvalho Chehab } 66332cf86f6SMauro Carvalho Chehab 66432cf86f6SMauro Carvalho Chehab dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); 66532cf86f6SMauro Carvalho Chehab 66632cf86f6SMauro Carvalho Chehab buf = kzalloc(ir->chunk_size, GFP_KERNEL); 66732cf86f6SMauro Carvalho Chehab if (!buf) 66832cf86f6SMauro Carvalho Chehab return -ENOMEM; 66932cf86f6SMauro Carvalho Chehab 67032cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 67132cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 67232cf86f6SMauro Carvalho Chehab goto out_unlocked; 67332cf86f6SMauro Carvalho Chehab } 67432cf86f6SMauro Carvalho Chehab if (!ir->attached) { 67532cf86f6SMauro Carvalho Chehab ret = -ENODEV; 67632cf86f6SMauro Carvalho Chehab goto out_locked; 67732cf86f6SMauro Carvalho Chehab } 67832cf86f6SMauro Carvalho Chehab 67932cf86f6SMauro Carvalho Chehab if (length % ir->chunk_size) { 68032cf86f6SMauro Carvalho Chehab ret = -EINVAL; 68132cf86f6SMauro Carvalho Chehab goto out_locked; 68232cf86f6SMauro Carvalho Chehab } 68332cf86f6SMauro Carvalho Chehab 68432cf86f6SMauro Carvalho Chehab /* 68532cf86f6SMauro Carvalho Chehab * we add ourselves to the task queue before buffer check 68632cf86f6SMauro Carvalho Chehab * to avoid losing scan code (in case when queue is awaken somewhere 68732cf86f6SMauro Carvalho Chehab * between while condition checking and scheduling) 68832cf86f6SMauro Carvalho Chehab */ 68932cf86f6SMauro Carvalho Chehab add_wait_queue(&ir->buf->wait_poll, &wait); 69032cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 69132cf86f6SMauro Carvalho Chehab 69232cf86f6SMauro Carvalho Chehab /* 69332cf86f6SMauro Carvalho Chehab * while we didn't provide 'length' bytes, device is opened in blocking 69432cf86f6SMauro Carvalho Chehab * mode and 'copy_to_user' is happy, wait for data. 69532cf86f6SMauro Carvalho Chehab */ 69632cf86f6SMauro Carvalho Chehab while (written < length && ret == 0) { 69732cf86f6SMauro Carvalho Chehab if (lirc_buffer_empty(ir->buf)) { 69832cf86f6SMauro Carvalho Chehab /* According to the read(2) man page, 'written' can be 69932cf86f6SMauro Carvalho Chehab * returned as less than 'length', instead of blocking 70032cf86f6SMauro Carvalho Chehab * again, returning -EWOULDBLOCK, or returning 70132cf86f6SMauro Carvalho Chehab * -ERESTARTSYS */ 70232cf86f6SMauro Carvalho Chehab if (written) 70332cf86f6SMauro Carvalho Chehab break; 70432cf86f6SMauro Carvalho Chehab if (file->f_flags & O_NONBLOCK) { 70532cf86f6SMauro Carvalho Chehab ret = -EWOULDBLOCK; 70632cf86f6SMauro Carvalho Chehab break; 70732cf86f6SMauro Carvalho Chehab } 70832cf86f6SMauro Carvalho Chehab if (signal_pending(current)) { 70932cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 71032cf86f6SMauro Carvalho Chehab break; 71132cf86f6SMauro Carvalho Chehab } 71232cf86f6SMauro Carvalho Chehab 71332cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 71432cf86f6SMauro Carvalho Chehab schedule(); 71532cf86f6SMauro Carvalho Chehab set_current_state(TASK_INTERRUPTIBLE); 71632cf86f6SMauro Carvalho Chehab 71732cf86f6SMauro Carvalho Chehab if (mutex_lock_interruptible(&ir->irctl_lock)) { 71832cf86f6SMauro Carvalho Chehab ret = -ERESTARTSYS; 71932cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 72032cf86f6SMauro Carvalho Chehab set_current_state(TASK_RUNNING); 72132cf86f6SMauro Carvalho Chehab goto out_unlocked; 72232cf86f6SMauro Carvalho Chehab } 72332cf86f6SMauro Carvalho Chehab 72432cf86f6SMauro Carvalho Chehab if (!ir->attached) { 72532cf86f6SMauro Carvalho Chehab ret = -ENODEV; 72632cf86f6SMauro Carvalho Chehab break; 72732cf86f6SMauro Carvalho Chehab } 72832cf86f6SMauro Carvalho Chehab } else { 72932cf86f6SMauro Carvalho Chehab lirc_buffer_read(ir->buf, buf); 73060519af3SHans Verkuil ret = copy_to_user((void __user *)buffer+written, buf, 73132cf86f6SMauro Carvalho Chehab ir->buf->chunk_size); 73232cf86f6SMauro Carvalho Chehab if (!ret) 73332cf86f6SMauro Carvalho Chehab written += ir->buf->chunk_size; 73432cf86f6SMauro Carvalho Chehab else 73532cf86f6SMauro Carvalho Chehab ret = -EFAULT; 73632cf86f6SMauro Carvalho Chehab } 73732cf86f6SMauro Carvalho Chehab } 73832cf86f6SMauro Carvalho Chehab 73932cf86f6SMauro Carvalho Chehab remove_wait_queue(&ir->buf->wait_poll, &wait); 74032cf86f6SMauro Carvalho Chehab set_current_state(TASK_RUNNING); 74132cf86f6SMauro Carvalho Chehab 74232cf86f6SMauro Carvalho Chehab out_locked: 74332cf86f6SMauro Carvalho Chehab mutex_unlock(&ir->irctl_lock); 74432cf86f6SMauro Carvalho Chehab 74532cf86f6SMauro Carvalho Chehab out_unlocked: 74632cf86f6SMauro Carvalho Chehab kfree(buf); 74732cf86f6SMauro Carvalho Chehab 74832cf86f6SMauro Carvalho Chehab return ret ? ret : written; 74932cf86f6SMauro Carvalho Chehab } 75032cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_read); 75132cf86f6SMauro Carvalho Chehab 75232cf86f6SMauro Carvalho Chehab void *lirc_get_pdata(struct file *file) 75332cf86f6SMauro Carvalho Chehab { 7540990a97aSAl Viro return irctls[iminor(file_inode(file))]->d.data; 75532cf86f6SMauro Carvalho Chehab } 75632cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_get_pdata); 75732cf86f6SMauro Carvalho Chehab 75832cf86f6SMauro Carvalho Chehab 7590e835087SDan Carpenter ssize_t lirc_dev_fop_write(struct file *file, const char __user *buffer, 76032cf86f6SMauro Carvalho Chehab size_t length, loff_t *ppos) 76132cf86f6SMauro Carvalho Chehab { 762496ad9aaSAl Viro struct irctl *ir = irctls[iminor(file_inode(file))]; 76332cf86f6SMauro Carvalho Chehab 76432cf86f6SMauro Carvalho Chehab if (!ir) { 7653fac0314SAndi Shyti pr_err("called with invalid irctl\n"); 76632cf86f6SMauro Carvalho Chehab return -ENODEV; 76732cf86f6SMauro Carvalho Chehab } 76832cf86f6SMauro Carvalho Chehab 76932cf86f6SMauro Carvalho Chehab if (!ir->attached) 77032cf86f6SMauro Carvalho Chehab return -ENODEV; 77132cf86f6SMauro Carvalho Chehab 77232cf86f6SMauro Carvalho Chehab return -EINVAL; 77332cf86f6SMauro Carvalho Chehab } 77432cf86f6SMauro Carvalho Chehab EXPORT_SYMBOL(lirc_dev_fop_write); 77532cf86f6SMauro Carvalho Chehab 77632cf86f6SMauro Carvalho Chehab 77732cf86f6SMauro Carvalho Chehab static int __init lirc_dev_init(void) 77832cf86f6SMauro Carvalho Chehab { 77932cf86f6SMauro Carvalho Chehab int retval; 78032cf86f6SMauro Carvalho Chehab 78132cf86f6SMauro Carvalho Chehab lirc_class = class_create(THIS_MODULE, "lirc"); 78232cf86f6SMauro Carvalho Chehab if (IS_ERR(lirc_class)) { 7833fac0314SAndi Shyti pr_err("class_create failed\n"); 78454fcecafSAndi Shyti return PTR_ERR(lirc_class); 78532cf86f6SMauro Carvalho Chehab } 78632cf86f6SMauro Carvalho Chehab 78732cf86f6SMauro Carvalho Chehab retval = alloc_chrdev_region(&lirc_base_dev, 0, MAX_IRCTL_DEVICES, 78832cf86f6SMauro Carvalho Chehab IRCTL_DEV_NAME); 78932cf86f6SMauro Carvalho Chehab if (retval) { 79032cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 7913fac0314SAndi Shyti pr_err("alloc_chrdev_region failed\n"); 79254fcecafSAndi Shyti return retval; 79332cf86f6SMauro Carvalho Chehab } 79432cf86f6SMauro Carvalho Chehab 79532cf86f6SMauro Carvalho Chehab 7963fac0314SAndi Shyti pr_info("IR Remote Control driver registered, major %d\n", 7973fac0314SAndi Shyti MAJOR(lirc_base_dev)); 79832cf86f6SMauro Carvalho Chehab 79954fcecafSAndi Shyti return 0; 80032cf86f6SMauro Carvalho Chehab } 80132cf86f6SMauro Carvalho Chehab 80232cf86f6SMauro Carvalho Chehab 80332cf86f6SMauro Carvalho Chehab 80432cf86f6SMauro Carvalho Chehab static void __exit lirc_dev_exit(void) 80532cf86f6SMauro Carvalho Chehab { 80632cf86f6SMauro Carvalho Chehab class_destroy(lirc_class); 80732cf86f6SMauro Carvalho Chehab unregister_chrdev_region(lirc_base_dev, MAX_IRCTL_DEVICES); 8083fac0314SAndi Shyti pr_info("module unloaded\n"); 80932cf86f6SMauro Carvalho Chehab } 81032cf86f6SMauro Carvalho Chehab 81132cf86f6SMauro Carvalho Chehab module_init(lirc_dev_init); 81232cf86f6SMauro Carvalho Chehab module_exit(lirc_dev_exit); 81332cf86f6SMauro Carvalho Chehab 81432cf86f6SMauro Carvalho Chehab MODULE_DESCRIPTION("LIRC base driver module"); 81532cf86f6SMauro Carvalho Chehab MODULE_AUTHOR("Artur Lipowski"); 81632cf86f6SMauro Carvalho Chehab MODULE_LICENSE("GPL"); 81732cf86f6SMauro Carvalho Chehab 81832cf86f6SMauro Carvalho Chehab module_param(debug, bool, S_IRUGO | S_IWUSR); 81932cf86f6SMauro Carvalho Chehab MODULE_PARM_DESC(debug, "Enable debugging messages"); 820