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92 lines
2.1 KiB
92 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/errno.h> |
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#include <linux/miscdevice.h> /* for misc_register, and MISC_DYNAMIC_MINOR */ |
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#include <linux/types.h> |
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#include <linux/uaccess.h> |
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#include "speakup.h" |
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#include "spk_priv.h" |
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static int misc_registered; |
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static int dev_opened; |
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static ssize_t speakup_file_write(struct file *fp, const char __user *buffer, |
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size_t nbytes, loff_t *ppos) |
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{ |
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size_t count = nbytes; |
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const char __user *ptr = buffer; |
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size_t bytes; |
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unsigned long flags; |
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u_char buf[256]; |
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if (!synth) |
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return -ENODEV; |
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while (count > 0) { |
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bytes = min(count, sizeof(buf)); |
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if (copy_from_user(buf, ptr, bytes)) |
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return -EFAULT; |
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count -= bytes; |
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ptr += bytes; |
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spin_lock_irqsave(&speakup_info.spinlock, flags); |
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synth_write(buf, bytes); |
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spin_unlock_irqrestore(&speakup_info.spinlock, flags); |
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} |
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return (ssize_t)nbytes; |
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} |
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static ssize_t speakup_file_read(struct file *fp, char __user *buf, |
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size_t nbytes, loff_t *ppos) |
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{ |
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return 0; |
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} |
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static int speakup_file_open(struct inode *ip, struct file *fp) |
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{ |
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if (!synth) |
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return -ENODEV; |
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if (xchg(&dev_opened, 1)) |
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return -EBUSY; |
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return 0; |
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} |
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static int speakup_file_release(struct inode *ip, struct file *fp) |
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{ |
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dev_opened = 0; |
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return 0; |
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} |
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static const struct file_operations synth_fops = { |
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.read = speakup_file_read, |
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.write = speakup_file_write, |
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.open = speakup_file_open, |
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.release = speakup_file_release, |
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}; |
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static struct miscdevice synth_device = { |
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.minor = MISC_DYNAMIC_MINOR, |
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.name = "synth", |
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.fops = &synth_fops, |
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}; |
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void speakup_register_devsynth(void) |
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{ |
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if (misc_registered != 0) |
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return; |
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/* zero it so if register fails, deregister will not ref invalid ptrs */ |
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if (misc_register(&synth_device)) { |
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pr_warn("Couldn't initialize miscdevice /dev/synth.\n"); |
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} else { |
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pr_info("initialized device: /dev/synth, node (MAJOR %d, MINOR %d)\n", |
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MISC_MAJOR, synth_device.minor); |
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misc_registered = 1; |
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} |
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} |
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void speakup_unregister_devsynth(void) |
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{ |
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if (!misc_registered) |
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return; |
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pr_info("speakup: unregistering synth device /dev/synth\n"); |
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misc_deregister(&synth_device); |
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misc_registered = 0; |
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}
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