cp210x.c (d4706c05c59d7afdadd8e7cfc1bf470356938c89) cp210x.c (6f0bcf720ea81e90e6066d14d5506565049a2eb5)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 *
7 * Support to set flow control line levels using TIOCMGET and TIOCMSET
8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow

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350
351/* Part number definitions */
352#define CP210X_PARTNUM_CP2101 0x01
353#define CP210X_PARTNUM_CP2102 0x02
354#define CP210X_PARTNUM_CP2103 0x03
355#define CP210X_PARTNUM_CP2104 0x04
356#define CP210X_PARTNUM_CP2105 0x05
357#define CP210X_PARTNUM_CP2108 0x08
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver
4 *
5 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk)
6 *
7 * Support to set flow control line levels using TIOCMGET and TIOCMSET
8 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow

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350
351/* Part number definitions */
352#define CP210X_PARTNUM_CP2101 0x01
353#define CP210X_PARTNUM_CP2102 0x02
354#define CP210X_PARTNUM_CP2103 0x03
355#define CP210X_PARTNUM_CP2104 0x04
356#define CP210X_PARTNUM_CP2105 0x05
357#define CP210X_PARTNUM_CP2108 0x08
358#define CP210X_PARTNUM_CP2102N_QFN28 0x20
359#define CP210X_PARTNUM_CP2102N_QFN24 0x21
360#define CP210X_PARTNUM_CP2102N_QFN20 0x22
358#define CP210X_PARTNUM_UNKNOWN 0xFF
359
360/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
361struct cp210x_comm_status {
362 __le32 ulErrors;
363 __le32 ulHoldReasons;
364 __le32 ulAmountInInQueue;
365 __le32 ulAmountInOutQueue;

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449#define CP2105_GPIO1_RS485_MODE BIT(2)
450
451/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
452struct cp210x_gpio_write {
453 u8 mask;
454 u8 state;
455} __packed;
456
361#define CP210X_PARTNUM_UNKNOWN 0xFF
362
363/* CP210X_GET_COMM_STATUS returns these 0x13 bytes */
364struct cp210x_comm_status {
365 __le32 ulErrors;
366 __le32 ulHoldReasons;
367 __le32 ulAmountInInQueue;
368 __le32 ulAmountInOutQueue;

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452#define CP2105_GPIO1_RS485_MODE BIT(2)
453
454/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
455struct cp210x_gpio_write {
456 u8 mask;
457 u8 state;
458} __packed;
459
460static bool cp210x_is_cp2102n(struct usb_serial *serial)
461{
462 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
463
464 return (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) ||
465 (priv->partnum == CP210X_PARTNUM_CP2102N_QFN24) ||
466 (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20);
467}
468
457/*
458 * Helper to get interface number when we only have struct usb_serial.
459 */
460static u8 cp210x_interface_num(struct usb_serial *serial)
461{
462 struct usb_host_interface *cur_altsetting;
463
464 cur_altsetting = serial->interface->cur_altsetting;

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1048 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1049 * or 1 otherwise.
1050 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1051 * otherwise.
1052 */
1053static void cp210x_change_speed(struct tty_struct *tty,
1054 struct usb_serial_port *port, struct ktermios *old_termios)
1055{
469/*
470 * Helper to get interface number when we only have struct usb_serial.
471 */
472static u8 cp210x_interface_num(struct usb_serial *serial)
473{
474 struct usb_host_interface *cur_altsetting;
475
476 cur_altsetting = serial->interface->cur_altsetting;

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1060 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps
1061 * or 1 otherwise.
1062 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1
1063 * otherwise.
1064 */
1065static void cp210x_change_speed(struct tty_struct *tty,
1066 struct usb_serial_port *port, struct ktermios *old_termios)
1067{
1056 struct cp210x_serial_private *priv = usb_get_serial_data(port->serial);
1068 struct usb_serial *serial = port->serial;
1069 struct cp210x_serial_private *priv = usb_get_serial_data(serial);
1057 u32 baud;
1058
1059 baud = tty->termios.c_ospeed;
1060
1070 u32 baud;
1071
1072 baud = tty->termios.c_ospeed;
1073
1061 /* This maps the requested rate to a rate valid on cp2102 or cp2103,
1062 * or to an arbitrary rate in [1M, max_speed]
1074 /*
1075 * This maps the requested rate to the actual rate on cp2102n, a valid
1076 * rate on cp2102 or cp2103, or to an arbitrary rate in
1077 * [1M, max_speed].
1063 *
1064 * NOTE: B0 is not implemented.
1065 */
1078 *
1079 * NOTE: B0 is not implemented.
1080 */
1066 if (baud < 1000000)
1081 if (cp210x_is_cp2102n(serial)) {
1082 int clk_div;
1083 int prescaler;
1084
1085 baud = clamp(baud, 300u, priv->max_speed);
1086 prescaler = (baud <= 365) ? 4 : 1;
1087 clk_div = DIV_ROUND_CLOSEST(48000000, 2 * prescaler * baud);
1088 baud = 48000000 / (2 * prescaler * clk_div);
1089 } else if (baud < 1000000) {
1067 baud = cp210x_get_an205_rate(baud);
1090 baud = cp210x_get_an205_rate(baud);
1068 else if (baud > priv->max_speed)
1091 } else if (baud > priv->max_speed) {
1069 baud = priv->max_speed;
1092 baud = priv->max_speed;
1093 }
1070
1071 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1072 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1073 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1074 if (old_termios)
1075 baud = old_termios->c_ospeed;
1076 else
1077 baud = 9600;

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1515 max = 2000000;
1516 break;
1517 case CP210X_PARTNUM_CP2105:
1518 if (cp210x_interface_num(serial) == 0)
1519 max = 2000000; /* ECI */
1520 else
1521 max = 921600; /* SCI */
1522 break;
1094
1095 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud);
1096 if (cp210x_write_u32_reg(port, CP210X_SET_BAUDRATE, baud)) {
1097 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud);
1098 if (old_termios)
1099 baud = old_termios->c_ospeed;
1100 else
1101 baud = 9600;

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1539 max = 2000000;
1540 break;
1541 case CP210X_PARTNUM_CP2105:
1542 if (cp210x_interface_num(serial) == 0)
1543 max = 2000000; /* ECI */
1544 else
1545 max = 921600; /* SCI */
1546 break;
1547 case CP210X_PARTNUM_CP2102N_QFN28:
1548 case CP210X_PARTNUM_CP2102N_QFN24:
1549 case CP210X_PARTNUM_CP2102N_QFN20:
1550 max = 3000000;
1551 break;
1523 default:
1524 max = 2000000;
1525 break;
1526 }
1527
1528 priv->max_speed = max;
1529}
1530

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1553 max = 2000000;
1554 break;
1555 }
1556
1557 priv->max_speed = max;
1558}
1559

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