From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/accessibility/speakup/devsynth.c | 178 +++++++++++++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 drivers/accessibility/speakup/devsynth.c (limited to 'drivers/accessibility/speakup/devsynth.c') diff --git a/drivers/accessibility/speakup/devsynth.c b/drivers/accessibility/speakup/devsynth.c new file mode 100644 index 000000000..e3d909bd0 --- /dev/null +++ b/drivers/accessibility/speakup/devsynth.c @@ -0,0 +1,178 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include /* for misc_register, and MISC_DYNAMIC_MINOR */ +#include +#include + +#include "speakup.h" +#include "spk_priv.h" + +static int synth_registered, synthu_registered; +static int dev_opened; + +/* Latin1 version */ +static ssize_t speakup_file_write(struct file *fp, const char __user *buffer, + size_t nbytes, loff_t *ppos) +{ + size_t count = nbytes; + const char __user *ptr = buffer; + size_t bytes; + unsigned long flags; + u_char buf[256]; + + if (!synth) + return -ENODEV; + while (count > 0) { + bytes = min(count, sizeof(buf)); + if (copy_from_user(buf, ptr, bytes)) + return -EFAULT; + count -= bytes; + ptr += bytes; + spin_lock_irqsave(&speakup_info.spinlock, flags); + synth_write(buf, bytes); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + } + return (ssize_t)nbytes; +} + +/* UTF-8 version */ +static ssize_t speakup_file_writeu(struct file *fp, const char __user *buffer, + size_t nbytes, loff_t *ppos) +{ + size_t count = nbytes, consumed, want; + const char __user *ptr = buffer; + size_t bytes; + unsigned long flags; + unsigned char buf[256]; + u16 ubuf[256]; + size_t in, out; + + if (!synth) + return -ENODEV; + + want = 1; + while (count >= want) { + /* Copy some UTF-8 piece from userland */ + bytes = min(count, sizeof(buf)); + if (copy_from_user(buf, ptr, bytes)) + return -EFAULT; + + /* Convert to u16 */ + for (in = 0, out = 0; in < bytes; in += consumed) { + s32 value; + + value = synth_utf8_get(buf + in, bytes - in, &consumed, &want); + if (value == -1) { + /* Invalid or incomplete */ + + if (want > bytes - in) + /* We don't have it all yet, stop here + * and wait for the rest + */ + bytes = in; + + continue; + } + + if (value < 0x10000) + ubuf[out++] = value; + } + + count -= bytes; + ptr += bytes; + + /* And speak this up */ + if (out) { + spin_lock_irqsave(&speakup_info.spinlock, flags); + for (in = 0; in < out; in++) + synth_buffer_add(ubuf[in]); + synth_start(); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + } + } + + return (ssize_t)(nbytes - count); +} + +static ssize_t speakup_file_read(struct file *fp, char __user *buf, + size_t nbytes, loff_t *ppos) +{ + return 0; +} + +static int speakup_file_open(struct inode *ip, struct file *fp) +{ + if (!synth) + return -ENODEV; + if (xchg(&dev_opened, 1)) + return -EBUSY; + return 0; +} + +static int speakup_file_release(struct inode *ip, struct file *fp) +{ + dev_opened = 0; + return 0; +} + +static const struct file_operations synth_fops = { + .read = speakup_file_read, + .write = speakup_file_write, + .open = speakup_file_open, + .release = speakup_file_release, +}; + +static const struct file_operations synthu_fops = { + .read = speakup_file_read, + .write = speakup_file_writeu, + .open = speakup_file_open, + .release = speakup_file_release, +}; + +static struct miscdevice synth_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "synth", + .fops = &synth_fops, +}; + +static struct miscdevice synthu_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "synthu", + .fops = &synthu_fops, +}; + +void speakup_register_devsynth(void) +{ + if (!synth_registered) { + if (misc_register(&synth_device)) { + pr_warn("Couldn't initialize miscdevice /dev/synth.\n"); + } else { + pr_info("initialized device: /dev/synth, node (MAJOR %d, MINOR %d)\n", + MISC_MAJOR, synth_device.minor); + synth_registered = 1; + } + } + if (!synthu_registered) { + if (misc_register(&synthu_device)) { + pr_warn("Couldn't initialize miscdevice /dev/synthu.\n"); + } else { + pr_info("initialized device: /dev/synthu, node (MAJOR %d, MINOR %d)\n", + MISC_MAJOR, synthu_device.minor); + synthu_registered = 1; + } + } +} + +void speakup_unregister_devsynth(void) +{ + if (synth_registered) { + pr_info("speakup: unregistering synth device /dev/synth\n"); + misc_deregister(&synth_device); + synth_registered = 0; + } + if (synthu_registered) { + pr_info("speakup: unregistering synth device /dev/synthu\n"); + misc_deregister(&synthu_device); + synthu_registered = 0; + } +} -- cgit v1.3.1