Merge tag 'for-linus-5.13b-rc8-tag' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-microblaze.git] / drivers / usb / serial / cp210x.c

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ee595d1..fcb812b 100644 (file)
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -252,9 +252,11 @@ struct cp210x_serial_private {
        u8                      gpio_input;
 #endif
        u8                      partnum;
+       u32                     fw_version;
        speed_t                 min_speed;
        speed_t                 max_speed;
        bool                    use_actual_rate;
+       bool                    no_flow_control;
 };
 
 enum cp210x_event_state {
@@ -398,6 +400,7 @@ struct cp210x_special_chars {
 
 /* CP210X_VENDOR_SPECIFIC values */
 #define CP210X_READ_2NCONFIG   0x000E
+#define CP210X_GET_FW_VER_2N   0x0010
 #define CP210X_READ_LATCH      0x00C2
 #define CP210X_GET_PARTNUM     0x370B
 #define CP210X_GET_PORTCONFIG  0x370C
@@ -537,6 +540,12 @@ struct cp210x_single_port_config {
 #define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX      587
 #define CP210X_2NCONFIG_GPIO_CONTROL_IDX       600
 
+/* CP2102N QFN20 port configuration values */
+#define CP2102N_QFN20_GPIO2_TXLED_MODE         BIT(2)
+#define CP2102N_QFN20_GPIO3_RXLED_MODE         BIT(3)
+#define CP2102N_QFN20_GPIO1_RS485_MODE         BIT(4)
+#define CP2102N_QFN20_GPIO0_CLK_MODE           BIT(6)
+
 /* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
 struct cp210x_gpio_write {
        u8      mask;
@@ -1122,6 +1131,7 @@ static bool cp210x_termios_change(const struct ktermios *a, const struct ktermio
 static void cp210x_set_flow_control(struct tty_struct *tty,
                struct usb_serial_port *port, struct ktermios *old_termios)
 {
+       struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
        struct cp210x_port_private *port_priv = usb_get_serial_port_data(port);
        struct cp210x_special_chars chars;
        struct cp210x_flow_ctl flow_ctl;
@@ -1129,6 +1139,15 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
        u32 ctl_hs;
        int ret;
 
+       /*
+        * Some CP2102N interpret ulXonLimit as ulFlowReplace (erratum
+        * CP2102N_E104). Report back that flow control is not supported.
+        */
+       if (priv->no_flow_control) {
+               tty->termios.c_cflag &= ~CRTSCTS;
+               tty->termios.c_iflag &= ~(IXON | IXOFF);
+       }
+
        if (old_termios &&
                        C_CRTSCTS(tty) == (old_termios->c_cflag & CRTSCTS) &&
                        I_IXON(tty) == (old_termios->c_iflag & IXON) &&
@@ -1185,19 +1204,20 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
                port_priv->crtscts = false;
        }
 
-       if (I_IXOFF(tty))
+       if (I_IXOFF(tty)) {
                flow_repl |= CP210X_SERIAL_AUTO_RECEIVE;
-       else
+
+               flow_ctl.ulXonLimit = cpu_to_le32(128);
+               flow_ctl.ulXoffLimit = cpu_to_le32(128);
+       } else {
                flow_repl &= ~CP210X_SERIAL_AUTO_RECEIVE;
+       }
 
        if (I_IXON(tty))
                flow_repl |= CP210X_SERIAL_AUTO_TRANSMIT;
        else
                flow_repl &= ~CP210X_SERIAL_AUTO_TRANSMIT;
 
-       flow_ctl.ulXonLimit = cpu_to_le32(128);
-       flow_ctl.ulXoffLimit = cpu_to_le32(128);
-
        dev_dbg(&port->dev, "%s - ctrl = 0x%02x, flow = 0x%02x\n", __func__,
                        ctl_hs, flow_repl);
 
@@ -1733,7 +1753,19 @@ static int cp2102n_gpioconf_init(struct usb_serial *serial)
        priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
 
        /* 0 indicates GPIO mode, 1 is alternate function */
-       priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
+       if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
+               /* QFN20 is special... */
+               if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE)   /* GPIO 0 */
+                       priv->gpio_altfunc |= BIT(0);
+               if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
+                       priv->gpio_altfunc |= BIT(1);
+               if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
+                       priv->gpio_altfunc |= BIT(2);
+               if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
+                       priv->gpio_altfunc |= BIT(3);
+       } else {
+               priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
+       }
 
        if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
                /*
@@ -1908,6 +1940,45 @@ static void cp210x_init_max_speed(struct usb_serial *serial)
        priv->use_actual_rate = use_actual_rate;
 }
 
+static int cp210x_get_fw_version(struct usb_serial *serial, u16 value)
+{
+       struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+       u8 ver[3];
+       int ret;
+
+       ret = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST, value,
+                       ver, sizeof(ver));
+       if (ret)
+               return ret;
+
+       dev_dbg(&serial->interface->dev, "%s - %d.%d.%d\n", __func__,
+                       ver[0], ver[1], ver[2]);
+
+       priv->fw_version = ver[0] << 16 | ver[1] << 8 | ver[2];
+
+       return 0;
+}
+
+static void cp210x_determine_quirks(struct usb_serial *serial)
+{
+       struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+       int ret;
+
+       switch (priv->partnum) {
+       case CP210X_PARTNUM_CP2102N_QFN28:
+       case CP210X_PARTNUM_CP2102N_QFN24:
+       case CP210X_PARTNUM_CP2102N_QFN20:
+               ret = cp210x_get_fw_version(serial, CP210X_GET_FW_VER_2N);
+               if (ret)
+                       break;
+               if (priv->fw_version <= 0x10004)
+                       priv->no_flow_control = true;
+               break;
+       default:
+               break;
+       }
+}
+
 static int cp210x_attach(struct usb_serial *serial)
 {
        int result;
@@ -1928,6 +1999,7 @@ static int cp210x_attach(struct usb_serial *serial)
 
        usb_set_serial_data(serial, priv);
 
+       cp210x_determine_quirks(serial);
        cp210x_init_max_speed(serial);
 
        result = cp210x_gpio_init(serial);