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[PATCH v2 4/5] msmouse: Add pnp data
From: |
Arwed Meyer |
Subject: |
[PATCH v2 4/5] msmouse: Add pnp data |
Date: |
Thu, 8 Sep 2022 19:31:19 +0200 |
Make msmouse send serial pnp data.
Enables you to see nice qemu device name in Win9x.
Signed-off-by: Arwed Meyer <arwed.meyer@gmx.de>
---
chardev/msmouse.c | 58 ++++++++++++++++++++++++++++++++++++++---------
1 file changed, 47 insertions(+), 11 deletions(-)
diff --git a/chardev/msmouse.c b/chardev/msmouse.c
index e9aa3eab55..29eb97fedc 100644
--- a/chardev/msmouse.c
+++ b/chardev/msmouse.c
@@ -35,11 +35,24 @@
#define MSMOUSE_HI2(n) (((n) & 0xc0) >> 6)
#define MSMOUSE_PWR(cm) (cm & (CHR_TIOCM_RTS | CHR_TIOCM_DTR))
+/* Serial PnP for 6 bit devices/mice sends all ASCII chars - 0x20 */
+#define M(c) (c - 0x20)
/* Serial fifo size. */
#define MSMOUSE_BUF_SZ 64
/* Mouse ID: Send "M3" cause we behave like a 3 button logitech mouse. */
const uint8_t mouse_id[] = {'M', '3'};
+/*
+ * PnP start "(", PnP version (1.0), vendor ID, product ID, '\\',
+ * serial ID (omitted), '\\', MS class name, '\\', driver ID (omitted), '\\',
+ * product description, checksum, ")"
+ * Missing parts are inserted later.
+ */
+const uint8_t pnp_data[] = {M('('), 1, '$', M('Q'), M('M'), M('U'),
+ M('0'), M('0'), M('0'), M('1'),
+ M('\\'), M('\\'),
+ M('M'), M('O'), M('U'), M('S'), M('E'),
+ M('\\'), M('\\')};
struct MouseChardev {
Chardev parent;
@@ -154,11 +167,22 @@ static int msmouse_chr_write(struct Chardev *s, const
uint8_t *buf, int len)
return len;
}
+static QemuInputHandler msmouse_handler = {
+ .name = "QEMU Microsoft Mouse",
+ .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
+ .event = msmouse_input_event,
+ .sync = msmouse_input_sync,
+};
+
static int msmouse_ioctl(Chardev *chr, int cmd, void *arg)
{
MouseChardev *mouse = MOUSE_CHARDEV(chr);
- int c;
+ int c, i, j;
+ uint8_t bytes[MSMOUSE_BUF_SZ / 2];
int *targ = (int *)arg;
+ const uint8_t hexchr[16] = {M('0'), M('1'), M('2'), M('3'), M('4'), M('5'),
+ M('6'), M('7'), M('8'), M('9'), M('A'), M('B'),
+ M('C'), M('D'), M('E'), M('F')};
switch (cmd) {
case CHR_IOCTL_SERIAL_SET_TIOCM:
@@ -167,11 +191,30 @@ static int msmouse_ioctl(Chardev *chr, int cmd, void *arg)
if (MSMOUSE_PWR(mouse->tiocm)) {
if (!MSMOUSE_PWR(c)) {
/*
- * Power on after reset: send "M3"
- * cause we behave like a 3 button logitech
- * mouse.
+ * Power on after reset: Send ID and PnP data
+ * No need to check fifo space as it is empty at this point.
*/
fifo8_push_all(&mouse->outbuf, mouse_id, sizeof(mouse_id));
+ /* Add PnP data: */
+ fifo8_push_all(&mouse->outbuf, pnp_data, sizeof(pnp_data));
+ /*
+ * Add device description from qemu handler name.
+ * Make sure this all fits into the queue beforehand!
+ */
+ c = M(')');
+ for (i = 0; msmouse_handler.name[i]; i++) {
+ bytes[i] = M(msmouse_handler.name[i]);
+ c += bytes[i];
+ }
+ /* Calc more of checksum */
+ for (j = 0; j < sizeof(pnp_data); j++) {
+ c += pnp_data[j];
+ }
+ c &= 0xff;
+ bytes[i++] = hexchr[c >> 4];
+ bytes[i++] = hexchr[c & 0x0f];
+ bytes[i++] = M(')');
+ fifo8_push_all(&mouse->outbuf, bytes, i);
/* Start sending data to serial. */
msmouse_chr_accept_input(chr);
}
@@ -204,13 +247,6 @@ static void char_msmouse_finalize(Object *obj)
fifo8_destroy(&mouse->outbuf);
}
-static QemuInputHandler msmouse_handler = {
- .name = "QEMU Microsoft Mouse",
- .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL,
- .event = msmouse_input_event,
- .sync = msmouse_input_sync,
-};
-
static void msmouse_chr_open(Chardev *chr,
ChardevBackend *backend,
bool *be_opened,
--
2.34.1