diff options
Diffstat (limited to 'drivers/media/IR/lirc_dev.c')
| -rw-r--r-- | drivers/media/IR/lirc_dev.c | 133 |
1 files changed, 89 insertions, 44 deletions
diff --git a/drivers/media/IR/lirc_dev.c b/drivers/media/IR/lirc_dev.c index 202581808bdc..8418b14ee4d2 100644 --- a/drivers/media/IR/lirc_dev.c +++ b/drivers/media/IR/lirc_dev.c @@ -57,13 +57,12 @@ struct irctl { struct task_struct *task; long jiffies_to_wait; - - struct cdev cdev; }; static DEFINE_MUTEX(lirc_dev_lock); static struct irctl *irctls[MAX_IRCTL_DEVICES]; +static struct cdev cdevs[MAX_IRCTL_DEVICES]; /* Only used for sysfs but defined to void otherwise */ static struct class *lirc_class; @@ -71,15 +70,13 @@ static struct class *lirc_class; /* helper function * initializes the irctl structure */ -static void init_irctl(struct irctl *ir) +static void lirc_irctl_init(struct irctl *ir) { - dev_dbg(ir->d.dev, LOGHEAD "initializing irctl\n", - ir->d.name, ir->d.minor); mutex_init(&ir->irctl_lock); ir->d.minor = NOPLUG; } -static void cleanup(struct irctl *ir) +static void lirc_irctl_cleanup(struct irctl *ir) { dev_dbg(ir->d.dev, LOGHEAD "cleaning up\n", ir->d.name, ir->d.minor); @@ -96,7 +93,7 @@ static void cleanup(struct irctl *ir) * reads key codes from driver and puts them into buffer * returns 0 on success */ -static int add_to_buf(struct irctl *ir) +static int lirc_add_to_buf(struct irctl *ir) { if (ir->d.add_to_buf) { int res = -ENODATA; @@ -139,7 +136,7 @@ static int lirc_thread(void *irctl) } if (kthread_should_stop()) break; - if (!add_to_buf(ir)) + if (!lirc_add_to_buf(ir)) wake_up_interruptible(&ir->buf->wait_poll); } else { set_current_state(TASK_INTERRUPTIBLE); @@ -154,12 +151,15 @@ static int lirc_thread(void *irctl) } -static struct file_operations fops = { +static struct file_operations lirc_dev_fops = { .owner = THIS_MODULE, .read = lirc_dev_fop_read, .write = lirc_dev_fop_write, .poll = lirc_dev_fop_poll, .unlocked_ioctl = lirc_dev_fop_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = lirc_dev_fop_ioctl, +#endif .open = lirc_dev_fop_open, .release = lirc_dev_fop_close, .llseek = noop_llseek, @@ -169,19 +169,20 @@ static int lirc_cdev_add(struct irctl *ir) { int retval; struct lirc_driver *d = &ir->d; + struct cdev *cdev = &cdevs[d->minor]; if (d->fops) { - cdev_init(&ir->cdev, d->fops); - ir->cdev.owner = d->owner; + cdev_init(cdev, d->fops); + cdev->owner = d->owner; } else { - cdev_init(&ir->cdev, &fops); - ir->cdev.owner = THIS_MODULE; + cdev_init(cdev, &lirc_dev_fops); + cdev->owner = THIS_MODULE; } - kobject_set_name(&ir->cdev.kobj, "lirc%d", d->minor); + kobject_set_name(&cdev->kobj, "lirc%d", d->minor); - retval = cdev_add(&ir->cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1); + retval = cdev_add(cdev, MKDEV(MAJOR(lirc_base_dev), d->minor), 1); if (retval) - kobject_put(&ir->cdev.kobj); + kobject_put(&cdev->kobj); return retval; } @@ -202,6 +203,12 @@ int lirc_register_driver(struct lirc_driver *d) goto out; } + if (!d->dev) { + printk(KERN_ERR "%s: dev pointer not filled in!\n", __func__); + err = -EINVAL; + goto out; + } + if (MAX_IRCTL_DEVICES <= d->minor) { dev_err(d->dev, "lirc_dev: lirc_register_driver: " "\"minor\" must be between 0 and %d (%d)!\n", @@ -277,7 +284,7 @@ int lirc_register_driver(struct lirc_driver *d) err = -ENOMEM; goto out_lock; } - init_irctl(ir); + lirc_irctl_init(ir); irctls[minor] = ir; d->minor = minor; @@ -316,7 +323,6 @@ int lirc_register_driver(struct lirc_driver *d) d->features = LIRC_CAN_REC_LIRCCODE; ir->d = *d; - ir->d.minor = minor; device_create(lirc_class, ir->d.dev, MKDEV(MAJOR(lirc_base_dev), ir->d.minor), NULL, @@ -357,21 +363,28 @@ EXPORT_SYMBOL(lirc_register_driver); int lirc_unregister_driver(int minor) { struct irctl *ir; + struct cdev *cdev; if (minor < 0 || minor >= MAX_IRCTL_DEVICES) { - printk(KERN_ERR "lirc_dev: lirc_unregister_driver: " - "\"minor (%d)\" must be between 0 and %d!\n", - minor, MAX_IRCTL_DEVICES-1); + printk(KERN_ERR "lirc_dev: %s: minor (%d) must be between " + "0 and %d!\n", __func__, minor, MAX_IRCTL_DEVICES-1); return -EBADRQC; } ir = irctls[minor]; + if (!ir) { + printk(KERN_ERR "lirc_dev: %s: failed to get irctl struct " + "for minor %d!\n", __func__, minor); + return -ENOENT; + } + + cdev = &cdevs[minor]; mutex_lock(&lirc_dev_lock); if (ir->d.minor != minor) { - printk(KERN_ERR "lirc_dev: lirc_unregister_driver: " - "minor (%d) device not registered!", minor); + printk(KERN_ERR "lirc_dev: %s: minor (%d) device not " + "registered!\n", __func__, minor); mutex_unlock(&lirc_dev_lock); return -ENOENT; } @@ -390,12 +403,11 @@ int lirc_unregister_driver(int minor) wake_up_interruptible(&ir->buf->wait_poll); mutex_lock(&ir->irctl_lock); ir->d.set_use_dec(ir->d.data); - module_put(ir->d.owner); + module_put(cdev->owner); mutex_unlock(&ir->irctl_lock); - cdev_del(&ir->cdev); } else { - cleanup(ir); - cdev_del(&ir->cdev); + lirc_irctl_cleanup(ir); + cdev_del(cdev); kfree(ir); irctls[minor] = NULL; } @@ -409,6 +421,7 @@ EXPORT_SYMBOL(lirc_unregister_driver); int lirc_dev_fop_open(struct inode *inode, struct file *file) { struct irctl *ir; + struct cdev *cdev; int retval = 0; if (iminor(inode) >= MAX_IRCTL_DEVICES) { @@ -425,7 +438,6 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file) retval = -ENODEV; goto error; } - file->private_data = ir; dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor); @@ -439,13 +451,14 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file) goto error; } - if (try_module_get(ir->d.owner)) { - ++ir->open; + cdev = &cdevs[iminor(inode)]; + if (try_module_get(cdev->owner)) { + ir->open++; retval = ir->d.set_use_inc(ir->d.data); if (retval) { - module_put(ir->d.owner); - --ir->open; + module_put(cdev->owner); + ir->open--; } else { lirc_buffer_clear(ir->buf); } @@ -469,17 +482,24 @@ EXPORT_SYMBOL(lirc_dev_fop_open); int lirc_dev_fop_close(struct inode *inode, struct file *file) { struct irctl *ir = irctls[iminor(inode)]; + struct cdev *cdev = &cdevs[iminor(inode)]; + + if (!ir) { + printk(KERN_ERR "%s: called with invalid irctl\n", __func__); + return -EINVAL; + } dev_dbg(ir->d.dev, LOGHEAD "close called\n", ir->d.name, ir->d.minor); WARN_ON(mutex_lock_killable(&lirc_dev_lock)); - --ir->open; + ir->open--; if (ir->attached) { ir->d.set_use_dec(ir->d.data); - module_put(ir->d.owner); + module_put(cdev->owner); } else { - cleanup(ir); + lirc_irctl_cleanup(ir); + cdev_del(cdev); irctls[ir->d.minor] = NULL; kfree(ir); } @@ -495,6 +515,11 @@ unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait) struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; unsigned int ret; + if (!ir) { + printk(KERN_ERR "%s: called with invalid irctl\n", __func__); + return POLLERR; + } + dev_dbg(ir->d.dev, LOGHEAD "poll called\n", ir->d.name, ir->d.minor); if (!ir->attached) { @@ -521,9 +546,14 @@ EXPORT_SYMBOL(lirc_dev_fop_poll); long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - unsigned long mode; + __u32 mode; int result = 0; - struct irctl *ir = file->private_data; + struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; + + if (!ir) { + printk(KERN_ERR "lirc_dev: %s: no irctl found!\n", __func__); + return -ENODEV; + } dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n", ir->d.name, ir->d.minor, cmd); @@ -538,7 +568,7 @@ long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) switch (cmd) { case LIRC_GET_FEATURES: - result = put_user(ir->d.features, (unsigned long *)arg); + result = put_user(ir->d.features, (__u32 *)arg); break; case LIRC_GET_REC_MODE: if (!(ir->d.features & LIRC_CAN_REC_MASK)) { @@ -548,7 +578,7 @@ long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) result = put_user(LIRC_REC2MODE (ir->d.features & LIRC_CAN_REC_MASK), - (unsigned long *)arg); + (__u32 *)arg); break; case LIRC_SET_REC_MODE: if (!(ir->d.features & LIRC_CAN_REC_MASK)) { @@ -556,7 +586,7 @@ long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) break; } - result = get_user(mode, (unsigned long *)arg); + result = get_user(mode, (__u32 *)arg); if (!result && !(LIRC_MODE2REC(mode) & ir->d.features)) result = -EINVAL; /* @@ -565,7 +595,7 @@ long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) */ break; case LIRC_GET_LENGTH: - result = put_user(ir->d.code_length, (unsigned long *)arg); + result = put_user(ir->d.code_length, (__u32 *)arg); break; case LIRC_GET_MIN_TIMEOUT: if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || @@ -574,7 +604,7 @@ long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) break; } - result = put_user(ir->d.min_timeout, (unsigned long *)arg); + result = put_user(ir->d.min_timeout, (__u32 *)arg); break; case LIRC_GET_MAX_TIMEOUT: if (!(ir->d.features & LIRC_CAN_SET_REC_TIMEOUT) || @@ -583,7 +613,7 @@ long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg) break; } - result = put_user(ir->d.max_timeout, (unsigned long *)arg); + result = put_user(ir->d.max_timeout, (__u32 *)arg); break; default: result = -EINVAL; @@ -604,12 +634,21 @@ ssize_t lirc_dev_fop_read(struct file *file, loff_t *ppos) { struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; - unsigned char buf[ir->chunk_size]; + unsigned char *buf; int ret = 0, written = 0; DECLARE_WAITQUEUE(wait, current); + if (!ir) { + printk(KERN_ERR "%s: called with invalid irctl\n", __func__); + return -ENODEV; + } + dev_dbg(ir->d.dev, LOGHEAD "read called\n", ir->d.name, ir->d.minor); + buf = kzalloc(ir->chunk_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + if (mutex_lock_interruptible(&ir->irctl_lock)) return -ERESTARTSYS; if (!ir->attached) { @@ -681,6 +720,7 @@ ssize_t lirc_dev_fop_read(struct file *file, mutex_unlock(&ir->irctl_lock); out_unlocked: + kfree(buf); dev_dbg(ir->d.dev, LOGHEAD "read result = %s (%d)\n", ir->d.name, ir->d.minor, ret ? "-EFAULT" : "OK", ret); @@ -709,6 +749,11 @@ ssize_t lirc_dev_fop_write(struct file *file, const char *buffer, { struct irctl *ir = irctls[iminor(file->f_dentry->d_inode)]; + if (!ir) { + printk(KERN_ERR "%s: called with invalid irctl\n", __func__); + return -ENODEV; + } + dev_dbg(ir->d.dev, LOGHEAD "write called\n", ir->d.name, ir->d.minor); if (!ir->attached) |