Merge tag 'usb-serial-5.5-rc1' of...

Merge tag 'usb-serial-5.5-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-next

Johan writes:

USB-serial updates for 5.5-rc1

Here are the USB-serial updates for 5.5-rc1, including:

 - support for a new class of pl2303 devices
 - improved divisor calculations for ch341
 - fixes for a remote-wakeup bug in the moschip drivers
 - improved device-type handling in mos7840
 - various cleanups of mos7840

Included are also some new device ids.

All have been in linux-next with no reported issues.
Signed-off-by: Johan Hovold <johan@kernel.org>

* tag 'usb-serial-5.5-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial:
  USB: serial: ftdi_sio: add device IDs for U-Blox C099-F9P
  USB: serial: option: add support for Foxconn T77W968 LTE modules
  USB: serial: mos7840: drop port open flag
  USB: serial: mos7840: drop read-urb check
  USB: serial: mos7840: drop port driver data accessors
  USB: serial: mos7840: drop serial struct accessor
  USB: serial: mos7840: drop paranoid serial checks
  USB: serial: mos7840: drop paranoid port checks
  USB: serial: mos7840: drop redundant urb context check
  USB: serial: mos7840: rip out broken interrupt handling
  USB: serial: mos7840: fix probe error handling
  USB: serial: mos7840: document MCS7810 detection hack
  USB: serial: mos7840: clean up device-type handling
  USB: serial: mos7840: fix remote wakeup
  USB: serial: mos7720: fix remote wakeup
  USB: serial: option: add support for DW5821e with eSIM support
  USB: serial: mos7840: add USB ID to support Moxa UPort 2210
  USB: serial: ch341: reimplement line-speed handling
  USB: serial: pl2303: add support for PL2303HXN

drivers/usb/serial/ch341.c

@@ -48,12 +48,6 @@
 #define CH341_BIT_DCD 0x08
 #define CH341_BITS_MODEM_STAT 0x0f /* all bits */
 
-/*******************************/
-/* baudrate calculation factor */
-/*******************************/
-#define CH341_BAUDBASE_FACTOR 1532620800
-#define CH341_BAUDBASE_DIVMAX 3
-
 /* Break support - the information used to implement this was gleaned from
  * the Net/FreeBSD uchcom.c driver by Takanori Watanabe.  Domo arigato.
  */
@@ -144,37 +138,96 @@ static int ch341_control_in(struct usb_device *dev,
 	return 0;
 }
 
+#define CH341_CLKRATE		48000000
+#define CH341_CLK_DIV(ps, fact)	(1 << (12 - 3 * (ps) - (fact)))
+#define CH341_MIN_RATE(ps)	(CH341_CLKRATE / (CH341_CLK_DIV((ps), 1) * 512))
+
+static const speed_t ch341_min_rates[] = {
+	CH341_MIN_RATE(0),
+	CH341_MIN_RATE(1),
+	CH341_MIN_RATE(2),
+	CH341_MIN_RATE(3),
+};
+
+/*
+ * The device line speed is given by the following equation:
+ *
+ *	baudrate = 48000000 / (2^(12 - 3 * ps - fact) * div), where
+ *
+ *		0 <= ps <= 3,
+ *		0 <= fact <= 1,
+ *		2 <= div <= 256 if fact = 0, or
+ *		9 <= div <= 256 if fact = 1
+ */
+static int ch341_get_divisor(speed_t speed)
+{
+	unsigned int fact, div, clk_div;
+	int ps;
+
+	/*
+	 * Clamp to supported range, this makes the (ps < 0) and (div < 2)
+	 * sanity checks below redundant.
+	 */
+	speed = clamp(speed, 46U, 3000000U);
+
+	/*
+	 * Start with highest possible base clock (fact = 1) that will give a
+	 * divisor strictly less than 512.
+	 */
+	fact = 1;
+	for (ps = 3; ps >= 0; ps--) {
+		if (speed > ch341_min_rates[ps])
+			break;
+	}
+
+	if (ps < 0)
+		return -EINVAL;
+
+	/* Determine corresponding divisor, rounding down. */
+	clk_div = CH341_CLK_DIV(ps, fact);
+	div = CH341_CLKRATE / (clk_div * speed);
+
+	/* Halve base clock (fact = 0) if required. */
+	if (div < 9 || div > 255) {
+		div /= 2;
+		clk_div *= 2;
+		fact = 0;
+	}
+
+	if (div < 2)
+		return -EINVAL;
+
+	/*
+	 * Pick next divisor if resulting rate is closer to the requested one,
+	 * scale up to avoid rounding errors on low rates.
+	 */
+	if (16 * CH341_CLKRATE / (clk_div * div) - 16 * speed >=
+			16 * speed - 16 * CH341_CLKRATE / (clk_div * (div + 1)))
+		div++;
+
+	return (0x100 - div) << 8 | fact << 2 | ps;
+}
+
 static int ch341_set_baudrate_lcr(struct usb_device *dev,
 				  struct ch341_private *priv, u8 lcr)
 {
-	short a;
+	int val;
 	int r;
-	unsigned long factor;
-	short divisor;
 
 	if (!priv->baud_rate)
 		return -EINVAL;
-	factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate);
-	divisor = CH341_BAUDBASE_DIVMAX;
-
-	while ((factor > 0xfff0) && divisor) {
-		factor >>= 3;
-		divisor--;
-	}
 
-	if (factor > 0xfff0)
+	val = ch341_get_divisor(priv->baud_rate);
+	if (val < 0)
 		return -EINVAL;
 
-	factor = 0x10000 - factor;
-	a = (factor & 0xff00) | divisor;
-
 	/*
 	 * CH341A buffers data until a full endpoint-size packet (32 bytes)
 	 * has been received unless bit 7 is set.
 	 */
-	a |= BIT(7);
+	val |= BIT(7);
 
-	r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, a);
+	r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, val);
 	if (r)
 		return r;
 

drivers/usb/serial/ftdi_sio.c

@@ -1033,6 +1033,9 @@ static const struct usb_device_id id_table_combined[] = {
 	/* Sienna devices */
 	{ USB_DEVICE(FTDI_VID, FTDI_SIENNA_PID) },
 	{ USB_DEVICE(ECHELON_VID, ECHELON_U20_PID) },
+	/* U-Blox devices */
+	{ USB_DEVICE(UBLOX_VID, UBLOX_C099F9P_ZED_PID) },
+	{ USB_DEVICE(UBLOX_VID, UBLOX_C099F9P_ODIN_PID) },
 	{ }					/* Terminating entry */
 };
 

drivers/usb/serial/ftdi_sio_ids.h

@@ -1558,3 +1558,10 @@
  */
 #define UNJO_VID			0x22B7
 #define UNJO_ISODEBUG_V1_PID		0x150D
+
+/*
+ * U-Blox products (http://www.u-blox.com).
+ */
+#define UBLOX_VID			0x1546
+#define UBLOX_C099F9P_ZED_PID		0x0502
+#define UBLOX_C099F9P_ODIN_PID		0x0503

drivers/usb/serial/mos7720.c

@@ -1833,10 +1833,6 @@ static int mos7720_startup(struct usb_serial *serial)
 	product = le16_to_cpu(serial->dev->descriptor.idProduct);
 	dev = serial->dev;
 
-	/* setting configuration feature to one */
-	usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
-			(__u8)0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5000);
-
 	if (product == MOSCHIP_DEVICE_ID_7715) {
 		struct urb *urb = serial->port[0]->interrupt_in_urb;
 

drivers/usb/serial/option.c

@@ -197,6 +197,7 @@ static void option_instat_callback(struct urb *urb);
 #define DELL_PRODUCT_5804_MINICARD_ATT		0x819b  /* Novatel E371 */
 
 #define DELL_PRODUCT_5821E			0x81d7
+#define DELL_PRODUCT_5821E_ESIM			0x81e0
 
 #define KYOCERA_VENDOR_ID			0x0c88
 #define KYOCERA_PRODUCT_KPC650			0x17da
@@ -1044,6 +1045,8 @@ static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE_AND_INTERFACE_INFO(DELL_VENDOR_ID, DELL_PRODUCT_5804_MINICARD_ATT, 0xff, 0xff, 0xff) },
 	{ USB_DEVICE(DELL_VENDOR_ID, DELL_PRODUCT_5821E),
 	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
+	{ USB_DEVICE(DELL_VENDOR_ID, DELL_PRODUCT_5821E_ESIM),
+	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
 	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_E100A) },	/* ADU-E100, ADU-310 */
 	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_500A) },
 	{ USB_DEVICE(ANYDATA_VENDOR_ID, ANYDATA_PRODUCT_ADU_620UW) },
@@ -1990,6 +1993,10 @@ static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0xa31d, 0xff, 0x06, 0x13) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0xa31d, 0xff, 0x06, 0x14) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0xa31d, 0xff, 0x06, 0x1b) },
+	{ USB_DEVICE(0x0489, 0xe0b4),						/* Foxconn T77W968 */
+	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
+	{ USB_DEVICE(0x0489, 0xe0b5),						/* Foxconn T77W968 ESIM */
+	  .driver_info = RSVD(0) | RSVD(1) | RSVD(6) },
 	{ USB_DEVICE(0x1508, 0x1001),						/* Fibocom NL668 */
 	  .driver_info = RSVD(4) | RSVD(5) | RSVD(6) },
 	{ USB_DEVICE(0x2cb7, 0x0104),						/* Fibocom NL678 series */

drivers/usb/serial/pl2303.c

@@ -47,6 +47,12 @@ static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
 	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
+	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
+	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
+	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
+	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
+	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
+	{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
 	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
 	{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
 	{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
@@ -130,9 +136,11 @@ MODULE_DEVICE_TABLE(usb, id_table);
 
 #define VENDOR_WRITE_REQUEST_TYPE	0x40
 #define VENDOR_WRITE_REQUEST		0x01
+#define VENDOR_WRITE_NREQUEST		0x80
 
 #define VENDOR_READ_REQUEST_TYPE	0xc0
 #define VENDOR_READ_REQUEST		0x01
+#define VENDOR_READ_NREQUEST		0x81
 
 #define UART_STATE_INDEX		8
 #define UART_STATE_MSR_MASK		0x8b
@@ -148,11 +156,24 @@ MODULE_DEVICE_TABLE(usb, id_table);
 
 #define PL2303_FLOWCTRL_MASK		0xf0
 
+#define PL2303_READ_TYPE_HX_STATUS	0x8080
+
+#define PL2303_HXN_RESET_REG		0x07
+#define PL2303_HXN_RESET_UPSTREAM_PIPE	0x02
+#define PL2303_HXN_RESET_DOWNSTREAM_PIPE	0x01
+
+#define PL2303_HXN_FLOWCTRL_REG		0x0a
+#define PL2303_HXN_FLOWCTRL_MASK	0x1c
+#define PL2303_HXN_FLOWCTRL_NONE	0x1c
+#define PL2303_HXN_FLOWCTRL_RTS_CTS	0x18
+#define PL2303_HXN_FLOWCTRL_XON_XOFF	0x0c
+
 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_COUNT
 };
 
@@ -184,16 +205,26 @@ static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 	[TYPE_HX] = {
 		.max_baud_rate		= 12000000,
 	},
+	[TYPE_HXN] = {
+		.max_baud_rate		= 12000000,
+	},
 };
 
 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 							unsigned char buf[1])
 {
+	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 	struct device *dev = &serial->interface->dev;
+	u8 request;
 	int res;
 
+	if (spriv->type == &pl2303_type_data[TYPE_HXN])
+		request = VENDOR_READ_NREQUEST;
+	else
+		request = VENDOR_READ_REQUEST;
+
 	res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
-			VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
+			request, VENDOR_READ_REQUEST_TYPE,
 			value, 0, buf, 1, 100);
 	if (res != 1) {
 		dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
@@ -211,13 +242,20 @@ static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 
 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 {
+	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 	struct device *dev = &serial->interface->dev;
+	u8 request;
 	int res;
 
 	dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 
+	if (spriv->type == &pl2303_type_data[TYPE_HXN])
+		request = VENDOR_WRITE_NREQUEST;
+	else
+		request = VENDOR_WRITE_REQUEST;
+
 	res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
-			VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
+			request, VENDOR_WRITE_REQUEST_TYPE,
 			value, index, NULL, 0, 100);
 	if (res) {
 		dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
@@ -230,6 +268,7 @@ static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 
 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 {
+	struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 	int ret = 0;
 	u8 *buf;
 
@@ -237,7 +276,11 @@ static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 	if (!buf)
 		return -ENOMEM;
 
+	if (spriv->type == &pl2303_type_data[TYPE_HXN])
+		ret = pl2303_vendor_read(serial, reg, buf);
+	else
 		ret = pl2303_vendor_read(serial, reg | 0x80, buf);
+
 	if (ret)
 		goto out_free;
 
@@ -320,6 +363,7 @@ static int pl2303_startup(struct usb_serial *serial)
 	struct pl2303_serial_private *spriv;
 	enum pl2303_type type = TYPE_01;
 	unsigned char *buf;
+	int res;
 
 	spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 	if (!spriv)
@@ -341,12 +385,22 @@ static int pl2303_startup(struct usb_serial *serial)
 		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;
 
 	usb_set_serial_data(serial, spriv);
 
+	if (type != TYPE_HXN) {
 		pl2303_vendor_read(serial, 0x8484, buf);
 		pl2303_vendor_write(serial, 0x0404, 0);
 		pl2303_vendor_read(serial, 0x8484, buf);
@@ -361,6 +415,7 @@ static int pl2303_startup(struct usb_serial *serial)
 			pl2303_vendor_write(serial, 2, 0x24);
 		else
 			pl2303_vendor_write(serial, 2, 0x44);
+	}
 
 	kfree(buf);
 
@@ -719,15 +774,32 @@ static void pl2303_set_termios(struct tty_struct *tty,
 	}
 
 	if (C_CRTSCTS(tty)) {
-		if (spriv->quirks & PL2303_QUIRK_LEGACY)
+		if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
-		else
+		} else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
+			pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
+					PL2303_HXN_FLOWCTRL_MASK,
+					PL2303_HXN_FLOWCTRL_RTS_CTS);
+		} else {
 			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
+		}
 	} else if (pl2303_enable_xonxoff(tty, spriv->type)) {
+		if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
+			pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
+					PL2303_HXN_FLOWCTRL_MASK,
+					PL2303_HXN_FLOWCTRL_XON_XOFF);
+		} else {
 			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
+		}
+	} else {
+		if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
+			pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
+					PL2303_HXN_FLOWCTRL_MASK,
+					PL2303_HXN_FLOWCTRL_NONE);
 		} else {
 			pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
 		}
+	}
 
 	kfree(buf);
 }
@@ -767,9 +839,15 @@ static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 		usb_clear_halt(serial->dev, port->read_urb->pipe);
 	} else {
 		/* reset upstream data pipes */
+		if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
+			pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
+					PL2303_HXN_RESET_UPSTREAM_PIPE |
+					PL2303_HXN_RESET_DOWNSTREAM_PIPE);
+		} else {
 			pl2303_vendor_write(serial, 8, 0);
 			pl2303_vendor_write(serial, 9, 0);
 		}
+	}
 
 	/* Setup termios */
 	if (tty)

drivers/usb/serial/pl2303.h

@@ -9,6 +9,12 @@
 #define PL2303_VENDOR_ID	0x067b
 #define PL2303_PRODUCT_ID	0x2303
 #define PL2303_PRODUCT_ID_TB		0x2304
+#define PL2303_PRODUCT_ID_GC		0x23a3
+#define PL2303_PRODUCT_ID_GB		0x23b3
+#define PL2303_PRODUCT_ID_GT		0x23c3
+#define PL2303_PRODUCT_ID_GL		0x23d3
+#define PL2303_PRODUCT_ID_GE		0x23e3
+#define PL2303_PRODUCT_ID_GS		0x23f3
 #define PL2303_PRODUCT_ID_RSAQ2		0x04bb
 #define PL2303_PRODUCT_ID_DCU11		0x1234
 #define PL2303_PRODUCT_ID_PHAROS	0xaaa0