[PATCH 08/12] USB: serial: xr: add support for XR21B1411

Johan Hovold
2021-03-30T14:40:25Z

The single-port XR21B1411 is similar to the XR21B142X type but uses
12-bit registers and 16-bit register addresses, the register requests
are different and are directed at the device rather than interface, and
5 and 6-bit words are not supported.

The register layout is very similar to XR21B142X except that most
registers are offset by 0xc00 (corresponding to a channel index of 12 in
the MSB of wIndex). As the device is single-port so that the derived
channel index is 0, the current register accessors can be reused after
simply changing the address width.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/usb/serial/xr_serial.c | 64 +++++++++++++++++++++++++---------
1 file changed, 48 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/serial/xr_serial.c b/drivers/usb/serial/xr_serial.c
index 32055c763147..46e5e1b2f3c0 100644
--- a/drivers/usb/serial/xr_serial.c
+++ b/drivers/usb/serial/xr_serial.c
@@ -108,18 +108,19 @@ struct xr_type {
u8 set_reg;
u8 get_reg;

- u8 uart_enable;
- u8 flow_control;
- u8 xon_char;
- u8 xoff_char;
- u8 tx_break;
- u8 gpio_mode;
- u8 gpio_direction;
- u8 gpio_set;
- u8 gpio_clear;
- u8 gpio_status;
- u8 custom_driver;
-
+ u16 uart_enable;
+ u16 flow_control;
+ u16 xon_char;
+ u16 xoff_char;
+ u16 tx_break;
+ u16 gpio_mode;
+ u16 gpio_direction;
+ u16 gpio_set;
+ u16 gpio_clear;
+ u16 gpio_status;
+ u16 custom_driver;
+
+ bool have_5_6_bit_mode;
bool have_xmit_toggle;

int (*enable)(struct usb_serial_port *port);
@@ -132,6 +133,7 @@ struct xr_type {
enum xr_type_id {
XR21V141X,
XR21B142X,
+ XR21B1411,
XR_TYPE_COUNT,
};

@@ -175,8 +177,27 @@ static const struct xr_type xr_types[] = {
.gpio_status = 0x10,
.custom_driver = 0x60,

+ .have_5_6_bit_mode = true,
.have_xmit_toggle = true,
},
+ [XR21B1411] = {
+ .reg_width = 12,
+ .reg_recipient = USB_RECIP_DEVICE,
+ .set_reg = 0x00,
+ .get_reg = 0x01,
+
+ .uart_enable = 0xc00,
+ .flow_control = 0xc06,
+ .xon_char = 0xc07,
+ .xoff_char = 0xc08,
+ .tx_break = 0xc0a,
+ .gpio_mode = 0xc0c,
+ .gpio_direction = 0xc0d,
+ .gpio_set = 0xc0e,
+ .gpio_clear = 0xc0f,
+ .gpio_status = 0xc10,
+ .custom_driver = 0x20d,
+ },
};

struct xr_data {
@@ -184,7 +205,7 @@ struct xr_data {
u8 channel; /* zero-based index or interface number */
};

-static int xr_set_reg(struct usb_serial_port *port, u8 channel, u8 reg, u16 val)
+static int xr_set_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 val)
{
struct xr_data *data = usb_get_serial_port_data(port);
const struct xr_type *type = data->type;
@@ -204,7 +225,7 @@ static int xr_set_reg(struct usb_serial_port *port, u8 channel, u8 reg, u16 val)
return 0;
}

-static int xr_get_reg(struct usb_serial_port *port, u8 channel, u8 reg, u16 *val)
+static int xr_get_reg(struct usb_serial_port *port, u8 channel, u16 reg, u16 *val)
{
struct xr_data *data = usb_get_serial_port_data(port);
const struct xr_type *type = data->type;
@@ -243,14 +264,14 @@ static int xr_get_reg(struct usb_serial_port *port, u8 channel, u8 reg, u16 *val
return ret;
}

-static int xr_set_reg_uart(struct usb_serial_port *port, u8 reg, u16 val)
+static int xr_set_reg_uart(struct usb_serial_port *port, u16 reg, u16 val)
{
struct xr_data *data = usb_get_serial_port_data(port);

return xr_set_reg(port, data->channel, reg, val);
}

-static int xr_get_reg_uart(struct usb_serial_port *port, u8 reg, u16 *val)
+static int xr_get_reg_uart(struct usb_serial_port *port, u16 reg, u16 *val)
{
struct xr_data *data = usb_get_serial_port_data(port);

@@ -646,6 +667,7 @@ static void xr21v141x_set_line_settings(struct tty_struct *tty,
static void xr_cdc_set_line_coding(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
+ struct xr_data *data = usb_get_serial_port_data(port);
struct usb_host_interface *alt = port->serial->interface->cur_altsetting;
struct usb_device *udev = port->serial->dev;
struct usb_cdc_line_coding *lc;
@@ -683,6 +705,15 @@ static void xr_cdc_set_line_coding(struct tty_struct *tty,
lc->bParityType = USB_CDC_NO_PARITY;
}

+ if (!data->type->have_5_6_bit_mode &&
+ (C_CSIZE(tty) == CS5 || C_CSIZE(tty) == CS6)) {
+ tty->termios.c_cflag &= ~CSIZE;
+ if (old_termios)
+ tty->termios.c_cflag |= old_termios->c_cflag & CSIZE;
+ else
+ tty->termios.c_cflag |= CS8;
+ }
+
switch (C_CSIZE(tty)) {
case CS5:
lc->bDataBits = 5;
@@ -876,6 +907,7 @@ static void xr_port_remove(struct usb_serial_port *port)

static const struct usb_device_id id_table[] = {
{ XR_DEVICE(0x04e2, 0x1410, XR21V141X) },
+ { XR_DEVICE(0x04e2, 0x1411, XR21B1411) },
{ XR_DEVICE(0x04e2, 0x1412, XR21V141X) },
{ XR_DEVICE(0x04e2, 0x1414, XR21V141X) },
{ XR_DEVICE(0x04e2, 0x1420, XR21B142X) },
--
2.26.3