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[media] media: lirc_dev: make better use of file->private_data
By making better use of file->private_data in lirc_dev we can avoid digging around in the irctls[] array, thereby simplifying the code. External drivers need to use lirc_get_pdata() instead of mucking around in file->private_data. The newly introduced lirc_init_pdata() function isn't very elegant, but it's a stopgap measure which can be removed once lirc_zilog is converted to rc-core. Signed-off-by: David Härdeman <david@hardeman.nu> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
parent
0510d81081
commit
615cd3fe6c
3 changed files with 33 additions and 93 deletions
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@ -247,36 +247,18 @@ EXPORT_SYMBOL(lirc_unregister_driver);
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int lirc_dev_fop_open(struct inode *inode, struct file *file)
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{
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struct irctl *ir;
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struct irctl *ir = container_of(inode->i_cdev, struct irctl, cdev);
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int retval;
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if (iminor(inode) >= MAX_IRCTL_DEVICES) {
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pr_err("open result for %d is -ENODEV\n", iminor(inode));
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return -ENODEV;
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}
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if (mutex_lock_interruptible(&lirc_dev_lock))
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return -ERESTARTSYS;
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ir = irctls[iminor(inode)];
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mutex_unlock(&lirc_dev_lock);
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if (!ir) {
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retval = -ENODEV;
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goto error;
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}
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dev_dbg(ir->d.dev, LOGHEAD "open called\n", ir->d.name, ir->d.minor);
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if (ir->open) {
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retval = -EBUSY;
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goto error;
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}
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if (ir->open)
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return -EBUSY;
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if (ir->d.rdev) {
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retval = rc_open(ir->d.rdev);
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if (retval)
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goto error;
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return retval;
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}
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if (ir->buf)
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@ -284,25 +266,18 @@ int lirc_dev_fop_open(struct inode *inode, struct file *file)
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ir->open++;
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lirc_init_pdata(inode, file);
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nonseekable_open(inode, file);
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return 0;
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error:
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return retval;
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}
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EXPORT_SYMBOL(lirc_dev_fop_open);
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int lirc_dev_fop_close(struct inode *inode, struct file *file)
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{
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struct irctl *ir = irctls[iminor(inode)];
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struct irctl *ir = file->private_data;
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int ret;
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if (!ir) {
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pr_err("called with invalid irctl\n");
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return -EINVAL;
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}
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ret = mutex_lock_killable(&lirc_dev_lock);
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WARN_ON(ret);
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@ -318,14 +293,9 @@ EXPORT_SYMBOL(lirc_dev_fop_close);
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unsigned int lirc_dev_fop_poll(struct file *file, poll_table *wait)
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{
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struct irctl *ir = irctls[iminor(file_inode(file))];
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struct irctl *ir = file->private_data;
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unsigned int ret;
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if (!ir) {
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pr_err("called with invalid irctl\n");
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return POLLERR;
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}
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if (!ir->attached)
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return POLLHUP | POLLERR;
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@ -348,14 +318,9 @@ EXPORT_SYMBOL(lirc_dev_fop_poll);
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long lirc_dev_fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct irctl *ir = file->private_data;
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__u32 mode;
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int result = 0;
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struct irctl *ir = irctls[iminor(file_inode(file))];
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if (!ir) {
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pr_err("no irctl found!\n");
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return -ENODEV;
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}
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dev_dbg(ir->d.dev, LOGHEAD "ioctl called (0x%x)\n",
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ir->d.name, ir->d.minor, cmd);
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@ -432,16 +397,11 @@ ssize_t lirc_dev_fop_read(struct file *file,
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size_t length,
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loff_t *ppos)
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{
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struct irctl *ir = irctls[iminor(file_inode(file))];
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struct irctl *ir = file->private_data;
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unsigned char *buf;
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int ret = 0, written = 0;
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DECLARE_WAITQUEUE(wait, current);
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if (!ir) {
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pr_err("called with invalid irctl\n");
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return -ENODEV;
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}
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if (!LIRC_CAN_REC(ir->d.features))
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return -EINVAL;
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@ -532,9 +492,19 @@ ssize_t lirc_dev_fop_read(struct file *file,
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}
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EXPORT_SYMBOL(lirc_dev_fop_read);
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void lirc_init_pdata(struct inode *inode, struct file *file)
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{
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struct irctl *ir = container_of(inode->i_cdev, struct irctl, cdev);
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file->private_data = ir;
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}
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EXPORT_SYMBOL(lirc_init_pdata);
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void *lirc_get_pdata(struct file *file)
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{
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return irctls[iminor(file_inode(file))]->d.data;
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struct irctl *ir = file->private_data;
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return ir->d.data;
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}
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EXPORT_SYMBOL(lirc_get_pdata);
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@ -879,7 +879,7 @@ static int fw_load(struct IR_tx *tx)
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static ssize_t read(struct file *filep, char __user *outbuf, size_t n,
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loff_t *ppos)
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{
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struct IR *ir = filep->private_data;
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struct IR *ir = lirc_get_pdata(filep);
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struct IR_rx *rx;
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struct lirc_buffer *rbuf = ir->l.rbuf;
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int ret = 0, written = 0, retries = 0;
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@ -1089,7 +1089,7 @@ static int send_code(struct IR_tx *tx, unsigned int code, unsigned int key)
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static ssize_t write(struct file *filep, const char __user *buf, size_t n,
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loff_t *ppos)
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{
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struct IR *ir = filep->private_data;
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struct IR *ir = lirc_get_pdata(filep);
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struct IR_tx *tx;
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size_t i;
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int failures = 0;
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@ -1197,7 +1197,7 @@ static ssize_t write(struct file *filep, const char __user *buf, size_t n,
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/* copied from lirc_dev */
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static unsigned int poll(struct file *filep, poll_table *wait)
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{
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struct IR *ir = filep->private_data;
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struct IR *ir = lirc_get_pdata(filep);
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struct IR_rx *rx;
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struct lirc_buffer *rbuf = ir->l.rbuf;
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unsigned int ret;
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@ -1230,7 +1230,7 @@ static unsigned int poll(struct file *filep, poll_table *wait)
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static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
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{
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struct IR *ir = filep->private_data;
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struct IR *ir = lirc_get_pdata(filep);
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unsigned long __user *uptr = (unsigned long __user *)arg;
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int result;
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unsigned long mode, features;
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@ -1280,46 +1280,18 @@ static long ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
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return result;
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}
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static struct IR *get_ir_device_by_minor(unsigned int minor)
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{
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struct IR *ir;
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struct IR *ret = NULL;
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mutex_lock(&ir_devices_lock);
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if (!list_empty(&ir_devices_list)) {
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list_for_each_entry(ir, &ir_devices_list, list) {
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if (ir->l.minor == minor) {
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ret = get_ir_device(ir, true);
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break;
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}
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}
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}
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mutex_unlock(&ir_devices_lock);
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return ret;
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}
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/*
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* Open the IR device. Get hold of our IR structure and
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* stash it in private_data for the file
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* Open the IR device.
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*/
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static int open(struct inode *node, struct file *filep)
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{
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struct IR *ir;
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unsigned int minor = MINOR(node->i_rdev);
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/* find our IR struct */
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ir = get_ir_device_by_minor(minor);
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if (!ir)
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return -ENODEV;
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lirc_init_pdata(node, filep);
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ir = lirc_get_pdata(filep);
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atomic_inc(&ir->open_count);
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/* stash our IR struct */
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filep->private_data = ir;
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nonseekable_open(node, filep);
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return 0;
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}
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@ -1327,14 +1299,7 @@ static int open(struct inode *node, struct file *filep)
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/* Close the IR device */
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static int close(struct inode *node, struct file *filep)
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{
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/* find our IR struct */
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struct IR *ir = filep->private_data;
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if (!ir) {
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pr_err("ir: %s: no private_data attached to the file!\n",
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__func__);
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return -ENODEV;
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}
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struct IR *ir = lirc_get_pdata(filep);
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atomic_dec(&ir->open_count);
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@ -1489,6 +1454,8 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
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*/
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ir->l.rbuf = &ir->rbuf;
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ir->l.dev = &adap->dev;
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/* This will be returned by lirc_get_pdata() */
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ir->l.data = ir;
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ret = lirc_buffer_init(ir->l.rbuf,
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ir->l.chunk_size, ir->l.buffer_size);
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if (ret)
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@ -187,6 +187,9 @@ int lirc_register_driver(struct lirc_driver *d);
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void lirc_unregister_driver(struct lirc_driver *d);
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/* Must be called in the open fop before lirc_get_pdata() can be used */
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void lirc_init_pdata(struct inode *inode, struct file *file);
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/* Returns the private data stored in the lirc_driver
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* associated with the given device file pointer.
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*/
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