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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.c188
1 files changed, 142 insertions, 46 deletions
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index eed9acd1ae08..fd773d252691 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -173,17 +173,22 @@ MODULE_DEVICE_TABLE(usb, id_table);
static void pl2303_set_break(struct usb_serial_port *port, bool enable);
enum pl2303_type {
- TYPE_01, /* Type 0 and 1 (difference unknown) */
- TYPE_HX, /* HX version of the pl2303 chip */
- TYPE_HXN, /* HXN version of the pl2303 chip */
+ TYPE_H,
+ TYPE_HX,
+ TYPE_TA,
+ TYPE_TB,
+ TYPE_HXD,
+ TYPE_HXN,
TYPE_COUNT
};
struct pl2303_type_data {
+ const char *name;
speed_t max_baud_rate;
unsigned long quirks;
unsigned int no_autoxonxoff:1;
unsigned int no_divisors:1;
+ unsigned int alt_divisors:1;
};
struct pl2303_serial_private {
@@ -200,15 +205,32 @@ struct pl2303_private {
};
static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
- [TYPE_01] = {
+ [TYPE_H] = {
+ .name = "H",
.max_baud_rate = 1228800,
.quirks = PL2303_QUIRK_LEGACY,
.no_autoxonxoff = true,
},
[TYPE_HX] = {
+ .name = "HX",
+ .max_baud_rate = 6000000,
+ },
+ [TYPE_TA] = {
+ .name = "TA",
+ .max_baud_rate = 6000000,
+ .alt_divisors = true,
+ },
+ [TYPE_TB] = {
+ .name = "TB",
+ .max_baud_rate = 12000000,
+ .alt_divisors = true,
+ },
+ [TYPE_HXD] = {
+ .name = "HXD",
.max_baud_rate = 12000000,
},
[TYPE_HXN] = {
+ .name = "G",
.max_baud_rate = 12000000,
.no_divisors = true,
},
@@ -362,42 +384,82 @@ static int pl2303_calc_num_ports(struct usb_serial *serial,
return 1;
}
+static bool pl2303_supports_hx_status(struct usb_serial *serial)
+{
+ int ret;
+ u8 buf;
+
+ ret = usb_control_msg_recv(serial->dev, 0, VENDOR_READ_REQUEST,
+ VENDOR_READ_REQUEST_TYPE, PL2303_READ_TYPE_HX_STATUS,
+ 0, &buf, 1, 100, GFP_KERNEL);
+
+ return ret == 0;
+}
+
+static int pl2303_detect_type(struct usb_serial *serial)
+{
+ struct usb_device_descriptor *desc = &serial->dev->descriptor;
+ u16 bcdDevice, bcdUSB;
+
+ /*
+ * Legacy PL2303H, variants 0 and 1 (difference unknown).
+ */
+ if (desc->bDeviceClass == 0x02)
+ return TYPE_H; /* variant 0 */
+
+ if (desc->bMaxPacketSize0 != 0x40) {
+ if (desc->bDeviceClass == 0x00 || desc->bDeviceClass == 0xff)
+ return TYPE_H; /* variant 1 */
+
+ return TYPE_H; /* variant 0 */
+ }
+
+ bcdDevice = le16_to_cpu(desc->bcdDevice);
+ bcdUSB = le16_to_cpu(desc->bcdUSB);
+
+ switch (bcdDevice) {
+ case 0x100:
+ /*
+ * Assume it's an HXN-type if the device doesn't support the old read
+ * request value.
+ */
+ if (bcdUSB == 0x200 && !pl2303_supports_hx_status(serial))
+ return TYPE_HXN;
+ break;
+ case 0x300:
+ if (bcdUSB == 0x200)
+ return TYPE_TA;
+
+ return TYPE_HX;
+ case 0x400:
+ return TYPE_HXD;
+ case 0x500:
+ return TYPE_TB;
+ }
+
+ dev_err(&serial->interface->dev,
+ "unknown device type, please report to linux-usb@vger.kernel.org\n");
+ return -ENODEV;
+}
+
static int pl2303_startup(struct usb_serial *serial)
{
struct pl2303_serial_private *spriv;
- enum pl2303_type type = TYPE_01;
+ enum pl2303_type type;
unsigned char *buf;
- int res;
+ int ret;
+
+ ret = pl2303_detect_type(serial);
+ if (ret < 0)
+ return ret;
+
+ type = ret;
+ dev_dbg(&serial->interface->dev, "device type: %s\n", pl2303_type_data[type].name);
spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
if (!spriv)
return -ENOMEM;
- buf = kmalloc(1, GFP_KERNEL);
- if (!buf) {
- kfree(spriv);
- return -ENOMEM;
- }
-
- if (serial->dev->descriptor.bDeviceClass == 0x02)
- type = TYPE_01; /* type 0 */
- else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
- type = TYPE_HX;
- else if (serial->dev->descriptor.bDeviceClass == 0x00)
- type = TYPE_01; /* type 1 */
- else if (serial->dev->descriptor.bDeviceClass == 0xFF)
- type = TYPE_01; /* type 1 */
- dev_dbg(&serial->interface->dev, "device type: %d\n", type);
-
- if (type == TYPE_HX) {
- res = usb_control_msg(serial->dev,
- usb_rcvctrlpipe(serial->dev, 0),
- VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
- PL2303_READ_TYPE_HX_STATUS, 0, buf, 1, 100);
- if (res != 1)
- type = TYPE_HXN;
- }
-
spriv->type = &pl2303_type_data[type];
spriv->quirks = (unsigned long)usb_get_serial_data(serial);
spriv->quirks |= spriv->type->quirks;
@@ -405,6 +467,12 @@ static int pl2303_startup(struct usb_serial *serial)
usb_set_serial_data(serial, spriv);
if (type != TYPE_HXN) {
+ buf = kmalloc(1, GFP_KERNEL);
+ if (!buf) {
+ kfree(spriv);
+ return -ENOMEM;
+ }
+
pl2303_vendor_read(serial, 0x8484, buf);
pl2303_vendor_write(serial, 0x0404, 0);
pl2303_vendor_read(serial, 0x8484, buf);
@@ -419,9 +487,9 @@ static int pl2303_startup(struct usb_serial *serial)
pl2303_vendor_write(serial, 2, 0x24);
else
pl2303_vendor_write(serial, 2, 0x44);
- }
- kfree(buf);
+ kfree(buf);
+ }
return 0;
}
@@ -553,6 +621,45 @@ static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
return baud;
}
+static speed_t pl2303_encode_baud_rate_divisor_alt(unsigned char buf[4],
+ speed_t baud)
+{
+ unsigned int baseline, mantissa, exponent;
+
+ /*
+ * Apparently, for the TA version the formula is:
+ * baudrate = 12M * 32 / (mantissa * 2^exponent)
+ * where
+ * mantissa = buf[10:0]
+ * exponent = buf[15:13 16]
+ */
+ baseline = 12000000 * 32;
+ mantissa = baseline / baud;
+ if (mantissa == 0)
+ mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
+ exponent = 0;
+ while (mantissa >= 2048) {
+ if (exponent < 15) {
+ mantissa >>= 1; /* divide by 2 */
+ exponent++;
+ } else {
+ /* Exponent is maxed. Trim mantissa and leave. */
+ mantissa = 2047;
+ break;
+ }
+ }
+
+ buf[3] = 0x80;
+ buf[2] = exponent & 0x01;
+ buf[1] = (exponent & ~0x01) << 4 | mantissa >> 8;
+ buf[0] = mantissa & 0xff;
+
+ /* Calculate and return the exact baud rate. */
+ baud = (baseline / mantissa) >> exponent;
+
+ return baud;
+}
+
static void pl2303_encode_baud_rate(struct tty_struct *tty,
struct usb_serial_port *port,
u8 buf[4])
@@ -580,6 +687,8 @@ static void pl2303_encode_baud_rate(struct tty_struct *tty,
if (baud == baud_sup)
baud = pl2303_encode_baud_rate_direct(buf, baud);
+ else if (spriv->type->alt_divisors)
+ baud = pl2303_encode_baud_rate_divisor_alt(buf, baud);
else
baud = pl2303_encode_baud_rate_divisor(buf, baud);
@@ -939,18 +1048,6 @@ static int pl2303_carrier_raised(struct usb_serial_port *port)
return 0;
}
-static int pl2303_get_serial(struct tty_struct *tty,
- struct serial_struct *ss)
-{
- struct usb_serial_port *port = tty->driver_data;
-
- ss->type = PORT_16654;
- ss->line = port->minor;
- ss->port = port->port_number;
- ss->baud_base = 460800;
- return 0;
-}
-
static void pl2303_set_break(struct usb_serial_port *port, bool enable)
{
struct usb_serial *serial = port->serial;
@@ -1134,7 +1231,6 @@ static struct usb_serial_driver pl2303_device = {
.close = pl2303_close,
.dtr_rts = pl2303_dtr_rts,
.carrier_raised = pl2303_carrier_raised,
- .get_serial = pl2303_get_serial,
.break_ctl = pl2303_break_ctl,
.set_termios = pl2303_set_termios,
.tiocmget = pl2303_tiocmget,
generated by cgit v1.2.3 (git 2.39.0) at 2025-10-31 15:04:17 +0300