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path: root/drivers/usb/serial/cp210x.c
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Diffstat (limited to 'drivers/usb/serial/cp210x.c')
-rw-r--r--drivers/usb/serial/cp210x.c278
1 files changed, 251 insertions, 27 deletions
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ee595d1bea0a..3c80bfbf3bec 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -155,6 +155,7 @@ static const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x10C4, 0x89A4) }, /* CESINEL FTBC Flexible Thyristor Bridge Controller */
{ USB_DEVICE(0x10C4, 0x89FB) }, /* Qivicon ZigBee USB Radio Stick */
{ USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */
+ { USB_DEVICE(0x10C4, 0x8A5B) }, /* CEL EM3588 ZigBee USB Stick */
{ USB_DEVICE(0x10C4, 0x8A5E) }, /* CEL EM3588 ZigBee USB Stick Long Range */
{ USB_DEVICE(0x10C4, 0x8B34) }, /* Qivicon ZigBee USB Radio Stick */
{ USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */
@@ -202,8 +203,8 @@ static const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x1901, 0x0194) }, /* GE Healthcare Remote Alarm Box */
{ USB_DEVICE(0x1901, 0x0195) }, /* GE B850/B650/B450 CP2104 DP UART interface */
{ USB_DEVICE(0x1901, 0x0196) }, /* GE B850 CP2105 DP UART interface */
- { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 Display serial interface */
- { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 M.2 Key E serial interface */
+ { USB_DEVICE(0x1901, 0x0197) }, /* GE CS1000 M.2 Key E serial interface */
+ { USB_DEVICE(0x1901, 0x0198) }, /* GE CS1000 Display serial interface */
{ USB_DEVICE(0x199B, 0xBA30) }, /* LORD WSDA-200-USB */
{ USB_DEVICE(0x19CF, 0x3000) }, /* Parrot NMEA GPS Flight Recorder */
{ USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */
@@ -247,14 +248,16 @@ struct cp210x_serial_private {
#ifdef CONFIG_GPIOLIB
struct gpio_chip gc;
bool gpio_registered;
- u8 gpio_pushpull;
- u8 gpio_altfunc;
- u8 gpio_input;
+ u16 gpio_pushpull;
+ u16 gpio_altfunc;
+ u16 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 +401,7 @@ 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
@@ -531,19 +535,79 @@ struct cp210x_single_port_config {
#define CP2104_GPIO1_RXLED_MODE BIT(1)
#define CP2104_GPIO2_RS485_MODE BIT(2)
+struct cp210x_quad_port_state {
+ __le16 gpio_mode_pb0;
+ __le16 gpio_mode_pb1;
+ __le16 gpio_mode_pb2;
+ __le16 gpio_mode_pb3;
+ __le16 gpio_mode_pb4;
+
+ __le16 gpio_lowpower_pb0;
+ __le16 gpio_lowpower_pb1;
+ __le16 gpio_lowpower_pb2;
+ __le16 gpio_lowpower_pb3;
+ __le16 gpio_lowpower_pb4;
+
+ __le16 gpio_latch_pb0;
+ __le16 gpio_latch_pb1;
+ __le16 gpio_latch_pb2;
+ __le16 gpio_latch_pb3;
+ __le16 gpio_latch_pb4;
+};
+
+/*
+ * CP210X_VENDOR_SPECIFIC, CP210X_GET_PORTCONFIG call reads these 0x49 bytes
+ * on a CP2108 chip.
+ *
+ * See https://www.silabs.com/documents/public/application-notes/an978-cp210x-usb-to-uart-api-specification.pdf
+ */
+struct cp210x_quad_port_config {
+ struct cp210x_quad_port_state reset_state;
+ struct cp210x_quad_port_state suspend_state;
+ u8 ipdelay_ifc[4];
+ u8 enhancedfxn_ifc[4];
+ u8 enhancedfxn_device;
+ u8 extclkfreq[4];
+} __packed;
+
+#define CP2108_EF_IFC_GPIO_TXLED 0x01
+#define CP2108_EF_IFC_GPIO_RXLED 0x02
+#define CP2108_EF_IFC_GPIO_RS485 0x04
+#define CP2108_EF_IFC_GPIO_RS485_LOGIC 0x08
+#define CP2108_EF_IFC_GPIO_CLOCK 0x10
+#define CP2108_EF_IFC_DYNAMIC_SUSPEND 0x40
+
/* CP2102N configuration array indices */
#define CP210X_2NCONFIG_CONFIG_VERSION_IDX 2
#define CP210X_2NCONFIG_GPIO_MODE_IDX 581
#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
#define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
-/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
+/* 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 0x02 bytes
+ * for CP2102N, CP2103, CP2104 and CP2105.
+ */
struct cp210x_gpio_write {
u8 mask;
u8 state;
};
/*
+ * CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x04 bytes
+ * for CP2108.
+ */
+struct cp210x_gpio_write16 {
+ __le16 mask;
+ __le16 state;
+};
+
+/*
* Helper to get interface number when we only have struct usb_serial.
*/
static u8 cp210x_interface_num(struct usb_serial *serial)
@@ -1122,6 +1186,7 @@ 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 +1194,15 @@ 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 +1259,20 @@ 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);
@@ -1414,52 +1489,84 @@ static int cp210x_gpio_get(struct gpio_chip *gc, unsigned int gpio)
{
struct usb_serial *serial = gpiochip_get_data(gc);
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
- u8 req_type = REQTYPE_DEVICE_TO_HOST;
+ u8 req_type;
+ u16 mask;
int result;
- u8 buf;
-
- if (priv->partnum == CP210X_PARTNUM_CP2105)
- req_type = REQTYPE_INTERFACE_TO_HOST;
+ int len;
result = usb_autopm_get_interface(serial->interface);
if (result)
return result;
- result = cp210x_read_vendor_block(serial, req_type,
- CP210X_READ_LATCH, &buf, sizeof(buf));
+ switch (priv->partnum) {
+ case CP210X_PARTNUM_CP2105:
+ req_type = REQTYPE_INTERFACE_TO_HOST;
+ len = 1;
+ break;
+ case CP210X_PARTNUM_CP2108:
+ req_type = REQTYPE_INTERFACE_TO_HOST;
+ len = 2;
+ break;
+ default:
+ req_type = REQTYPE_DEVICE_TO_HOST;
+ len = 1;
+ break;
+ }
+
+ mask = 0;
+ result = cp210x_read_vendor_block(serial, req_type, CP210X_READ_LATCH,
+ &mask, len);
+
usb_autopm_put_interface(serial->interface);
+
if (result < 0)
return result;
- return !!(buf & BIT(gpio));
+ le16_to_cpus(&mask);
+
+ return !!(mask & BIT(gpio));
}
static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
{
struct usb_serial *serial = gpiochip_get_data(gc);
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ struct cp210x_gpio_write16 buf16;
struct cp210x_gpio_write buf;
+ u16 mask, state;
+ u16 wIndex;
int result;
if (value == 1)
- buf.state = BIT(gpio);
+ state = BIT(gpio);
else
- buf.state = 0;
+ state = 0;
- buf.mask = BIT(gpio);
+ mask = BIT(gpio);
result = usb_autopm_get_interface(serial->interface);
if (result)
goto out;
- if (priv->partnum == CP210X_PARTNUM_CP2105) {
+ switch (priv->partnum) {
+ case CP210X_PARTNUM_CP2105:
+ buf.mask = (u8)mask;
+ buf.state = (u8)state;
result = cp210x_write_vendor_block(serial,
REQTYPE_HOST_TO_INTERFACE,
CP210X_WRITE_LATCH, &buf,
sizeof(buf));
- } else {
- u16 wIndex = buf.state << 8 | buf.mask;
-
+ break;
+ case CP210X_PARTNUM_CP2108:
+ buf16.mask = cpu_to_le16(mask);
+ buf16.state = cpu_to_le16(state);
+ result = cp210x_write_vendor_block(serial,
+ REQTYPE_HOST_TO_INTERFACE,
+ CP210X_WRITE_LATCH, &buf16,
+ sizeof(buf16));
+ break;
+ default:
+ wIndex = state << 8 | mask;
result = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
CP210X_VENDOR_SPECIFIC,
@@ -1467,6 +1574,7 @@ static void cp210x_gpio_set(struct gpio_chip *gc, unsigned int gpio, int value)
CP210X_WRITE_LATCH,
wIndex,
NULL, 0, USB_CTRL_SET_TIMEOUT);
+ break;
}
usb_autopm_put_interface(serial->interface);
@@ -1676,6 +1784,61 @@ static int cp2104_gpioconf_init(struct usb_serial *serial)
return 0;
}
+static int cp2108_gpio_init(struct usb_serial *serial)
+{
+ struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ struct cp210x_quad_port_config config;
+ u16 gpio_latch;
+ int result;
+ u8 i;
+
+ result = cp210x_read_vendor_block(serial, REQTYPE_DEVICE_TO_HOST,
+ CP210X_GET_PORTCONFIG, &config,
+ sizeof(config));
+ if (result < 0)
+ return result;
+
+ priv->gc.ngpio = 16;
+ priv->gpio_pushpull = le16_to_cpu(config.reset_state.gpio_mode_pb1);
+ gpio_latch = le16_to_cpu(config.reset_state.gpio_latch_pb1);
+
+ /*
+ * Mark all pins which are not in GPIO mode.
+ *
+ * Refer to table 9.1 "GPIO Mode alternate Functions" in the datasheet:
+ * https://www.silabs.com/documents/public/data-sheets/cp2108-datasheet.pdf
+ *
+ * Alternate functions of GPIO0 to GPIO3 are determine by enhancedfxn_ifc[0]
+ * and the similarly for the other pins; enhancedfxn_ifc[1]: GPIO4 to GPIO7,
+ * enhancedfxn_ifc[2]: GPIO8 to GPIO11, enhancedfxn_ifc[3]: GPIO12 to GPIO15.
+ */
+ for (i = 0; i < 4; i++) {
+ if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_TXLED)
+ priv->gpio_altfunc |= BIT(i * 4);
+ if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RXLED)
+ priv->gpio_altfunc |= BIT((i * 4) + 1);
+ if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_RS485)
+ priv->gpio_altfunc |= BIT((i * 4) + 2);
+ if (config.enhancedfxn_ifc[i] & CP2108_EF_IFC_GPIO_CLOCK)
+ priv->gpio_altfunc |= BIT((i * 4) + 3);
+ }
+
+ /*
+ * Like CP2102N, CP2108 has also no strict input and output pin
+ * modes. Do the same input mode emulation as CP2102N.
+ */
+ for (i = 0; i < priv->gc.ngpio; ++i) {
+ /*
+ * Set direction to "input" iff pin is open-drain and reset
+ * value is 1.
+ */
+ if (!(priv->gpio_pushpull & BIT(i)) && (gpio_latch & BIT(i)))
+ priv->gpio_input |= BIT(i);
+ }
+
+ return 0;
+}
+
static int cp2102n_gpioconf_init(struct usb_serial *serial)
{
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
@@ -1733,7 +1896,19 @@ 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) {
/*
@@ -1780,6 +1955,15 @@ static int cp210x_gpio_init(struct usb_serial *serial)
case CP210X_PARTNUM_CP2105:
result = cp2105_gpioconf_init(serial);
break;
+ case CP210X_PARTNUM_CP2108:
+ /*
+ * The GPIOs are not tied to any specific port so only register
+ * once for interface 0.
+ */
+ if (cp210x_interface_num(serial) != 0)
+ return 0;
+ result = cp2108_gpio_init(serial);
+ break;
case CP210X_PARTNUM_CP2102N_QFN28:
case CP210X_PARTNUM_CP2102N_QFN24:
case CP210X_PARTNUM_CP2102N_QFN20:
@@ -1908,6 +2092,45 @@ 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 +2151,7 @@ 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);
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