Merge tag 'char-misc-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc and other driver subsystem updates from Greg KH:
 "Here is the big set of char/misc and other driver subsystem updates
  for 6.10-rc1. Nothing major here, just lots of new drivers and updates
  for apis and new hardware types. Included in here are:

   - big IIO driver updates with more devices and drivers added

   - fpga driver updates

   - hyper-v driver updates

   - uio_pruss driver removal, no one uses it, other drivers control the
     same hardware now

   - binder minor updates

   - mhi driver updates

   - excon driver updates

   - counter driver updates

   - accessability driver updates

   - coresight driver updates

   - other hwtracing driver updates

   - nvmem driver updates

   - slimbus driver updates

   - spmi driver updates

   - other smaller misc and char driver updates

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (319 commits)
  misc: ntsync: mark driver as "broken" to prevent from building
  spmi: pmic-arb: Add multi bus support
  spmi: pmic-arb: Register controller for bus instead of arbiter
  spmi: pmic-arb: Make core resources acquiring a version operation
  spmi: pmic-arb: Make the APID init a version operation
  spmi: pmic-arb: Fix some compile warnings about members not being described
  dt-bindings: spmi: Deprecate qcom,bus-id
  dt-bindings: spmi: Add X1E80100 SPMI PMIC ARB schema
  spmi: pmic-arb: Replace three IS_ERR() calls by null pointer checks in spmi_pmic_arb_probe()
  spmi: hisi-spmi-controller: Do not override device identifier
  dt-bindings: spmi: hisilicon,hisi-spmi-controller: clean up example
  dt-bindings: spmi: hisilicon,hisi-spmi-controller: fix binding references
  spmi: make spmi_bus_type const
  extcon: adc-jack: Document missing struct members
  extcon: realtek: Remove unused of_gpio.h
  extcon: usbc-cros-ec: Convert to platform remove callback returning void
  extcon: usb-gpio: Convert to platform remove callback returning void
  extcon: max77843: Convert to platform remove callback returning void
  extcon: max3355: Convert to platform remove callback returning void
  extcon: intel-mrfld: Convert to platform remove callback returning void
  ...

1 files changed, 87 insertions, 5 deletions

diff --git a/drivers/accessibility/speakup/synth.c b/drivers/accessibility/speakup/synth.c
index 45f906103133..85062e605d79 100644
--- a/drivers/accessibility/speakup/synth.c
+++ b/drivers/accessibility/speakup/synth.c
@@ -217,10 +217,95 @@ void synth_write(const char *_buf, size_t count)
 	synth_start();
 }
 
+/* Consume one utf-8 character from buf (that contains up to count bytes),
+ * returns the unicode codepoint if valid, -1 otherwise.
+ * In all cases, returns the number of consumed bytes in *consumed,
+ * and the minimum number of bytes that would be needed for the next character
+ * in *want.
+ */
+s32 synth_utf8_get(const char *buf, size_t count, size_t *consumed, size_t *want)
+{
+	unsigned char c = buf[0];
+	int nbytes = 8 - fls(c ^ 0xff);
+	u32 value;
+	size_t i;
+
+	switch (nbytes) {
+	case 8: /* 0xff */
+	case 7: /* 0xfe */
+	case 1: /* 0x80 */
+		/* Invalid, drop */
+		*consumed = 1;
+		*want = 1;
+		return -1;
+
+	case 0:
+		/* ASCII, take as such */
+		*consumed = 1;
+		*want = 1;
+		return c;
+
+	default:
+		/* 2..6-byte UTF-8 */
+
+		if (count < nbytes) {
+			/* We don't have it all */
+			*consumed = 0;
+			*want = nbytes;
+			return -1;
+		}
+
+		/* First byte */
+		value = c & ((1u << (7 - nbytes)) - 1);
+
+		/* Other bytes */
+		for (i = 1; i < nbytes; i++) {
+			c = buf[i];
+			if ((c & 0xc0) != 0x80)	{
+				/* Invalid, drop the head */
+				*consumed = i;
+				*want = 1;
+				return -1;
+			}
+			value = (value << 6) | (c & 0x3f);
+		}
+
+		*consumed = nbytes;
+		*want = 1;
+		return value;
+	}
+}
+
+void synth_writeu(const char *buf, size_t count)
+{
+	size_t i, consumed, want;
+
+	/* Convert to u16 */
+	for (i = 0; i < count; i++) {
+		s32 value;
+
+		value = synth_utf8_get(buf + i, count - i, &consumed, &want);
+		if (value == -1) {
+			/* Invalid or incomplete */
+
+			if (want > count - i)
+				/* We don't have it all, stop */
+				count = i;
+
+			continue;
+		}
+
+		if (value < 0x10000)
+			synth_buffer_add(value);
+	}
+
+	synth_start();
+}
+
 void synth_printf(const char *fmt, ...)
 {
 	va_list args;
-	unsigned char buf[160], *p;
+	unsigned char buf[160];
 	int r;
 
 	va_start(args, fmt);
@@ -229,10 +314,7 @@ void synth_printf(const char *fmt, ...)
 	if (r > sizeof(buf) - 1)
 		r = sizeof(buf) - 1;
 
-	p = buf;
-	while (r--)
-		synth_buffer_add(*p++);
-	synth_start();
+	synth_writeu(buf, r);
 }
 EXPORT_SYMBOL_GPL(synth_printf);