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path: root/drivers/usb/serial/pl2303.c
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Diffstat (limited to 'drivers/usb/serial/pl2303.c')
-rw-r--r--drivers/usb/serial/pl2303.c71
1 files changed, 63 insertions, 8 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index a63ea99936f..1128e01525b 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -96,6 +96,7 @@ static struct usb_device_id id_table [] = {
{ USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
{ USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
{ USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
+ { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
{ } /* Terminating entry */
};
@@ -527,6 +528,12 @@ static void pl2303_set_termios(struct tty_struct *tty,
int baud;
int i;
u8 control;
+ const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,
+ 4800, 7200, 9600, 14400, 19200, 28800, 38400,
+ 57600, 115200, 230400, 460800, 614400,
+ 921600, 1228800, 2457600, 3000000, 6000000 };
+ int baud_floor, baud_ceil;
+ int k;
dbg("%s - port %d", __func__, port->number);
@@ -572,9 +579,39 @@ static void pl2303_set_termios(struct tty_struct *tty,
dbg("%s - data bits = %d", __func__, buf[6]);
}
+ /* For reference buf[0]:buf[3] baud rate value */
+ /* NOTE: Only the values defined in baud_sup are supported !
+ * => if unsupported values are set, the PL2303 seems to use
+ * 9600 baud (at least my PL2303X always does)
+ */
baud = tty_get_baud_rate(tty);
- dbg("%s - baud = %d", __func__, baud);
+ dbg("%s - baud requested = %d", __func__, baud);
if (baud) {
+ /* Set baudrate to nearest supported value */
+ for (k=0; k<ARRAY_SIZE(baud_sup); k++) {
+ if (baud_sup[k] / baud) {
+ baud_ceil = baud_sup[k];
+ if (k==0) {
+ baud = baud_ceil;
+ } else {
+ baud_floor = baud_sup[k-1];
+ if ((baud_ceil % baud)
+ > (baud % baud_floor))
+ baud = baud_floor;
+ else
+ baud = baud_ceil;
+ }
+ break;
+ }
+ }
+ if (baud > 1228800) {
+ /* type_0, type_1 only support up to 1228800 baud */
+ if (priv->type != HX)
+ baud = 1228800;
+ else if (baud > 6000000)
+ baud = 6000000;
+ }
+ dbg("%s - baud set = %d", __func__, baud);
buf[0] = baud & 0xff;
buf[1] = (baud >> 8) & 0xff;
buf[2] = (baud >> 16) & 0xff;
@@ -585,8 +622,16 @@ static void pl2303_set_termios(struct tty_struct *tty,
/* For reference buf[4]=1 is 1.5 stop bits */
/* For reference buf[4]=2 is 2 stop bits */
if (cflag & CSTOPB) {
- buf[4] = 2;
- dbg("%s - stop bits = 2", __func__);
+ /* NOTE: Comply with "real" UARTs / RS232:
+ * use 1.5 instead of 2 stop bits with 5 data bits
+ */
+ if ((cflag & CSIZE) == CS5) {
+ buf[4] = 1;
+ dbg("%s - stop bits = 1.5", __func__);
+ } else {
+ buf[4] = 2;
+ dbg("%s - stop bits = 2", __func__);
+ }
} else {
buf[4] = 0;
dbg("%s - stop bits = 1", __func__);
@@ -599,11 +644,21 @@ static void pl2303_set_termios(struct tty_struct *tty,
/* For reference buf[5]=3 is mark parity */
/* For reference buf[5]=4 is space parity */
if (cflag & PARODD) {
- buf[5] = 1;
- dbg("%s - parity = odd", __func__);
+ if (cflag & CMSPAR) {
+ buf[5] = 3;
+ dbg("%s - parity = mark", __func__);
+ } else {
+ buf[5] = 1;
+ dbg("%s - parity = odd", __func__);
+ }
} else {
- buf[5] = 2;
- dbg("%s - parity = even", __func__);
+ if (cflag & CMSPAR) {
+ buf[5] = 4;
+ dbg("%s - parity = space", __func__);
+ } else {
+ buf[5] = 2;
+ dbg("%s - parity = even", __func__);
+ }
}
} else {
buf[5] = 0;
@@ -647,7 +702,7 @@ static void pl2303_set_termios(struct tty_struct *tty,
pl2303_vendor_write(0x0, 0x0, serial);
}
- /* FIXME: Need to read back resulting baud rate */
+ /* Save resulting baud rate */
if (baud)
tty_encode_baud_rate(tty, baud, baud);