| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Prolific PL2303 USB to serial adaptor driver |
| * |
| * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com) |
| * Copyright (C) 2003 IBM Corp. |
| * |
| * Original driver for 2.2.x by anonymous |
| * |
| * See Documentation/usb/usb-serial.txt for more information on using this |
| * driver |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/tty.h> |
| #include <linux/tty_driver.h> |
| #include <linux/tty_flip.h> |
| #include <linux/serial.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/spinlock.h> |
| #include <linux/uaccess.h> |
| #include <linux/usb.h> |
| #include <linux/usb/serial.h> |
| #include <asm/unaligned.h> |
| #include "pl2303.h" |
| |
| |
| #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0) |
| #define PL2303_QUIRK_LEGACY BIT(1) |
| #define PL2303_QUIRK_ENDPOINT_HACK BIT(2) |
| |
| static const struct usb_device_id id_table[] = { |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID), |
| .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) }, |
| { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) }, |
| { 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(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, |
| { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) }, |
| { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID), |
| .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
| { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485), |
| .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
| { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B), |
| .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
| { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) }, |
| { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, |
| { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, |
| { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, |
| { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, |
| { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) }, |
| { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, |
| { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, |
| { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, |
| { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, |
| { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, |
| { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, |
| { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) }, |
| { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1), |
| .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, |
| { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65), |
| .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, |
| { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75), |
| .driver_info = PL2303_QUIRK_UART_STATE_IDX0 }, |
| { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81), |
| .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
| { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */ |
| { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) }, |
| { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) }, |
| { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) }, |
| { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) }, |
| { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) }, |
| { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) }, |
| { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) }, |
| { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) }, |
| { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID), |
| .driver_info = PL2303_QUIRK_ENDPOINT_HACK }, |
| { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) }, |
| { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) }, |
| { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) }, |
| { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) }, |
| { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) }, |
| { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) }, |
| { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) }, |
| { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) }, |
| { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) }, |
| { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) }, |
| { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) }, |
| { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) }, |
| { } /* Terminating entry */ |
| }; |
| |
| MODULE_DEVICE_TABLE(usb, id_table); |
| |
| #define SET_LINE_REQUEST_TYPE 0x21 |
| #define SET_LINE_REQUEST 0x20 |
| |
| #define SET_CONTROL_REQUEST_TYPE 0x21 |
| #define SET_CONTROL_REQUEST 0x22 |
| #define CONTROL_DTR 0x01 |
| #define CONTROL_RTS 0x02 |
| |
| #define BREAK_REQUEST_TYPE 0x21 |
| #define BREAK_REQUEST 0x23 |
| #define BREAK_ON 0xffff |
| #define BREAK_OFF 0x0000 |
| |
| #define GET_LINE_REQUEST_TYPE 0xa1 |
| #define GET_LINE_REQUEST 0x21 |
| |
| #define VENDOR_WRITE_REQUEST_TYPE 0x40 |
| #define VENDOR_WRITE_REQUEST 0x01 |
| |
| #define VENDOR_READ_REQUEST_TYPE 0xc0 |
| #define VENDOR_READ_REQUEST 0x01 |
| |
| #define UART_STATE_INDEX 8 |
| #define UART_STATE_MSR_MASK 0x8b |
| #define UART_STATE_TRANSIENT_MASK 0x74 |
| #define UART_DCD 0x01 |
| #define UART_DSR 0x02 |
| #define UART_BREAK_ERROR 0x04 |
| #define UART_RING 0x08 |
| #define UART_FRAME_ERROR 0x10 |
| #define UART_PARITY_ERROR 0x20 |
| #define UART_OVERRUN_ERROR 0x40 |
| #define UART_CTS 0x80 |
| |
| 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_COUNT |
| }; |
| |
| struct pl2303_type_data { |
| speed_t max_baud_rate; |
| unsigned long quirks; |
| }; |
| |
| struct pl2303_serial_private { |
| const struct pl2303_type_data *type; |
| unsigned long quirks; |
| }; |
| |
| struct pl2303_private { |
| spinlock_t lock; |
| u8 line_control; |
| u8 line_status; |
| |
| u8 line_settings[7]; |
| }; |
| |
| static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { |
| [TYPE_01] = { |
| .max_baud_rate = 1228800, |
| .quirks = PL2303_QUIRK_LEGACY, |
| }, |
| [TYPE_HX] = { |
| .max_baud_rate = 12000000, |
| }, |
| }; |
| |
| static int pl2303_vendor_read(struct usb_serial *serial, u16 value, |
| unsigned char buf[1]) |
| { |
| struct device *dev = &serial->interface->dev; |
| int res; |
| |
| res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), |
| VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE, |
| value, 0, buf, 1, 100); |
| if (res != 1) { |
| dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, |
| value, res); |
| if (res >= 0) |
| res = -EIO; |
| |
| return res; |
| } |
| |
| dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); |
| |
| return 0; |
| } |
| |
| static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) |
| { |
| struct device *dev = &serial->interface->dev; |
| int res; |
| |
| dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); |
| |
| res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
| VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, |
| value, index, NULL, 0, 100); |
| if (res) { |
| dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, |
| value, res); |
| return res; |
| } |
| |
| return 0; |
| } |
| |
| static int pl2303_probe(struct usb_serial *serial, |
| const struct usb_device_id *id) |
| { |
| usb_set_serial_data(serial, (void *)id->driver_info); |
| |
| return 0; |
| } |
| |
| /* |
| * Use interrupt endpoint from first interface if available. |
| * |
| * This is needed due to the looney way its endpoints are set up. |
| */ |
| static int pl2303_endpoint_hack(struct usb_serial *serial, |
| struct usb_serial_endpoints *epds) |
| { |
| struct usb_interface *interface = serial->interface; |
| struct usb_device *dev = serial->dev; |
| struct device *ddev = &interface->dev; |
| struct usb_host_interface *iface_desc; |
| struct usb_endpoint_descriptor *endpoint; |
| unsigned int i; |
| |
| if (interface == dev->actconfig->interface[0]) |
| return 0; |
| |
| /* check out the endpoints of the other interface */ |
| iface_desc = dev->actconfig->interface[0]->cur_altsetting; |
| |
| for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| endpoint = &iface_desc->endpoint[i].desc; |
| |
| if (!usb_endpoint_is_int_in(endpoint)) |
| continue; |
| |
| dev_dbg(ddev, "found interrupt in on separate interface\n"); |
| if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in)) |
| epds->interrupt_in[epds->num_interrupt_in++] = endpoint; |
| } |
| |
| return 0; |
| } |
| |
| static int pl2303_calc_num_ports(struct usb_serial *serial, |
| struct usb_serial_endpoints *epds) |
| { |
| unsigned long quirks = (unsigned long)usb_get_serial_data(serial); |
| struct device *dev = &serial->interface->dev; |
| int ret; |
| |
| if (quirks & PL2303_QUIRK_ENDPOINT_HACK) { |
| ret = pl2303_endpoint_hack(serial, epds); |
| if (ret) |
| return ret; |
| } |
| |
| if (epds->num_interrupt_in < 1) { |
| dev_err(dev, "required interrupt-in endpoint missing\n"); |
| return -ENODEV; |
| } |
| |
| return 1; |
| } |
| |
| static int pl2303_startup(struct usb_serial *serial) |
| { |
| struct pl2303_serial_private *spriv; |
| enum pl2303_type type = TYPE_01; |
| unsigned char *buf; |
| |
| spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); |
| if (!spriv) |
| return -ENOMEM; |
| |
| buf = kmalloc(1, GFP_KERNEL); |
| if (!buf) { |
| kfree(spriv); |
| return -ENOMEM; |
| } |
| |
| if (serial->dev->descriptor.bDeviceClass == 0x02) |
| type = TYPE_01; /* type 0 */ |
| else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) |
| type = TYPE_HX; |
| else if (serial->dev->descriptor.bDeviceClass == 0x00) |
| type = TYPE_01; /* type 1 */ |
| else if (serial->dev->descriptor.bDeviceClass == 0xFF) |
| type = TYPE_01; /* type 1 */ |
| dev_dbg(&serial->interface->dev, "device type: %d\n", type); |
| |
| 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); |
| |
| pl2303_vendor_read(serial, 0x8484, buf); |
| pl2303_vendor_write(serial, 0x0404, 0); |
| pl2303_vendor_read(serial, 0x8484, buf); |
| pl2303_vendor_read(serial, 0x8383, buf); |
| pl2303_vendor_read(serial, 0x8484, buf); |
| pl2303_vendor_write(serial, 0x0404, 1); |
| pl2303_vendor_read(serial, 0x8484, buf); |
| pl2303_vendor_read(serial, 0x8383, buf); |
| pl2303_vendor_write(serial, 0, 1); |
| pl2303_vendor_write(serial, 1, 0); |
| if (spriv->quirks & PL2303_QUIRK_LEGACY) |
| pl2303_vendor_write(serial, 2, 0x24); |
| else |
| pl2303_vendor_write(serial, 2, 0x44); |
| |
| kfree(buf); |
| |
| return 0; |
| } |
| |
| static void pl2303_release(struct usb_serial *serial) |
| { |
| struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
| |
| kfree(spriv); |
| } |
| |
| static int pl2303_port_probe(struct usb_serial_port *port) |
| { |
| struct pl2303_private *priv; |
| |
| priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| spin_lock_init(&priv->lock); |
| |
| usb_set_serial_port_data(port, priv); |
| |
| port->port.drain_delay = 256; |
| |
| return 0; |
| } |
| |
| static int pl2303_port_remove(struct usb_serial_port *port) |
| { |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| |
| kfree(priv); |
| |
| return 0; |
| } |
| |
| static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) |
| { |
| struct usb_device *dev = port->serial->dev; |
| int retval; |
| |
| dev_dbg(&port->dev, "%s - %02x\n", __func__, value); |
| |
| retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), |
| SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, |
| value, 0, NULL, 0, 100); |
| if (retval) |
| dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); |
| |
| return retval; |
| } |
| |
| /* |
| * Returns the nearest supported baud rate that can be set directly without |
| * using divisors. |
| */ |
| static speed_t pl2303_get_supported_baud_rate(speed_t baud) |
| { |
| static const speed_t baud_sup[] = { |
| 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, |
| 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, |
| 614400, 921600, 1228800, 2457600, 3000000, 6000000 |
| }; |
| |
| unsigned i; |
| |
| for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { |
| if (baud_sup[i] > baud) |
| break; |
| } |
| |
| if (i == ARRAY_SIZE(baud_sup)) |
| baud = baud_sup[i - 1]; |
| else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) |
| baud = baud_sup[i - 1]; |
| else |
| baud = baud_sup[i]; |
| |
| return baud; |
| } |
| |
| /* |
| * NOTE: If unsupported baud rates are set directly, the PL2303 seems to |
| * use 9600 baud. |
| */ |
| static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], |
| speed_t baud) |
| { |
| put_unaligned_le32(baud, buf); |
| |
| return baud; |
| } |
| |
| static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], |
| speed_t baud) |
| { |
| unsigned int baseline, mantissa, exponent; |
| |
| /* |
| * Apparently the formula is: |
| * baudrate = 12M * 32 / (mantissa * 4^exponent) |
| * where |
| * mantissa = buf[8:0] |
| * exponent = buf[11:9] |
| */ |
| baseline = 12000000 * 32; |
| mantissa = baseline / baud; |
| if (mantissa == 0) |
| mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ |
| exponent = 0; |
| while (mantissa >= 512) { |
| if (exponent < 7) { |
| mantissa >>= 2; /* divide by 4 */ |
| exponent++; |
| } else { |
| /* Exponent is maxed. Trim mantissa and leave. */ |
| mantissa = 511; |
| break; |
| } |
| } |
| |
| buf[3] = 0x80; |
| buf[2] = 0; |
| buf[1] = exponent << 1 | mantissa >> 8; |
| buf[0] = mantissa & 0xff; |
| |
| /* Calculate and return the exact baud rate. */ |
| baud = (baseline / mantissa) >> (exponent << 1); |
| |
| return baud; |
| } |
| |
| static void pl2303_encode_baud_rate(struct tty_struct *tty, |
| struct usb_serial_port *port, |
| u8 buf[4]) |
| { |
| struct usb_serial *serial = port->serial; |
| struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
| speed_t baud_sup; |
| speed_t baud; |
| |
| baud = tty_get_baud_rate(tty); |
| dev_dbg(&port->dev, "baud requested = %u\n", baud); |
| if (!baud) |
| return; |
| |
| if (spriv->type->max_baud_rate) |
| baud = min_t(speed_t, baud, spriv->type->max_baud_rate); |
| /* |
| * Use direct method for supported baud rates, otherwise use divisors. |
| */ |
| baud_sup = pl2303_get_supported_baud_rate(baud); |
| |
| if (baud == baud_sup) |
| baud = pl2303_encode_baud_rate_direct(buf, baud); |
| else |
| baud = pl2303_encode_baud_rate_divisor(buf, baud); |
| |
| /* Save resulting baud rate */ |
| tty_encode_baud_rate(tty, baud, baud); |
| dev_dbg(&port->dev, "baud set = %u\n", baud); |
| } |
| |
| static int pl2303_get_line_request(struct usb_serial_port *port, |
| unsigned char buf[7]) |
| { |
| struct usb_device *udev = port->serial->dev; |
| int ret; |
| |
| ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), |
| GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, |
| 0, 0, buf, 7, 100); |
| if (ret != 7) { |
| dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); |
| |
| if (ret >= 0) |
| ret = -EIO; |
| |
| return ret; |
| } |
| |
| dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); |
| |
| return 0; |
| } |
| |
| static int pl2303_set_line_request(struct usb_serial_port *port, |
| unsigned char buf[7]) |
| { |
| struct usb_device *udev = port->serial->dev; |
| int ret; |
| |
| ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, |
| 0, 0, buf, 7, 100); |
| if (ret < 0) { |
| dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); |
| return ret; |
| } |
| |
| dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); |
| |
| return 0; |
| } |
| |
| static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b) |
| { |
| bool ixon_change; |
| |
| ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) || |
| a->c_cc[VSTART] != b->c_cc[VSTART] || |
| a->c_cc[VSTOP] != b->c_cc[VSTOP]; |
| |
| return tty_termios_hw_change(a, b) || ixon_change; |
| } |
| |
| static void pl2303_set_termios(struct tty_struct *tty, |
| struct usb_serial_port *port, struct ktermios *old_termios) |
| { |
| struct usb_serial *serial = port->serial; |
| struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| unsigned long flags; |
| unsigned char *buf; |
| int ret; |
| u8 control; |
| |
| if (old_termios && !pl2303_termios_change(&tty->termios, old_termios)) |
| return; |
| |
| buf = kzalloc(7, GFP_KERNEL); |
| if (!buf) { |
| /* Report back no change occurred */ |
| if (old_termios) |
| tty->termios = *old_termios; |
| return; |
| } |
| |
| pl2303_get_line_request(port, buf); |
| |
| switch (C_CSIZE(tty)) { |
| case CS5: |
| buf[6] = 5; |
| break; |
| case CS6: |
| buf[6] = 6; |
| break; |
| case CS7: |
| buf[6] = 7; |
| break; |
| default: |
| case CS8: |
| buf[6] = 8; |
| } |
| dev_dbg(&port->dev, "data bits = %d\n", buf[6]); |
| |
| /* For reference buf[0]:buf[3] baud rate value */ |
| pl2303_encode_baud_rate(tty, port, &buf[0]); |
| |
| /* For reference buf[4]=0 is 1 stop bits */ |
| /* For reference buf[4]=1 is 1.5 stop bits */ |
| /* For reference buf[4]=2 is 2 stop bits */ |
| if (C_CSTOPB(tty)) { |
| /* |
| * NOTE: Comply with "real" UARTs / RS232: |
| * use 1.5 instead of 2 stop bits with 5 data bits |
| */ |
| if (C_CSIZE(tty) == CS5) { |
| buf[4] = 1; |
| dev_dbg(&port->dev, "stop bits = 1.5\n"); |
| } else { |
| buf[4] = 2; |
| dev_dbg(&port->dev, "stop bits = 2\n"); |
| } |
| } else { |
| buf[4] = 0; |
| dev_dbg(&port->dev, "stop bits = 1\n"); |
| } |
| |
| if (C_PARENB(tty)) { |
| /* For reference buf[5]=0 is none parity */ |
| /* For reference buf[5]=1 is odd parity */ |
| /* For reference buf[5]=2 is even parity */ |
| /* For reference buf[5]=3 is mark parity */ |
| /* For reference buf[5]=4 is space parity */ |
| if (C_PARODD(tty)) { |
| if (C_CMSPAR(tty)) { |
| buf[5] = 3; |
| dev_dbg(&port->dev, "parity = mark\n"); |
| } else { |
| buf[5] = 1; |
| dev_dbg(&port->dev, "parity = odd\n"); |
| } |
| } else { |
| if (C_CMSPAR(tty)) { |
| buf[5] = 4; |
| dev_dbg(&port->dev, "parity = space\n"); |
| } else { |
| buf[5] = 2; |
| dev_dbg(&port->dev, "parity = even\n"); |
| } |
| } |
| } else { |
| buf[5] = 0; |
| dev_dbg(&port->dev, "parity = none\n"); |
| } |
| |
| /* |
| * Some PL2303 are known to lose bytes if you change serial settings |
| * even to the same values as before. Thus we actually need to filter |
| * in this specific case. |
| * |
| * Note that the tty_termios_hw_change check above is not sufficient |
| * as a previously requested baud rate may differ from the one |
| * actually used (and stored in old_termios). |
| * |
| * NOTE: No additional locking needed for line_settings as it is |
| * only used in set_termios, which is serialised against itself. |
| */ |
| if (!old_termios || memcmp(buf, priv->line_settings, 7)) { |
| ret = pl2303_set_line_request(port, buf); |
| if (!ret) |
| memcpy(priv->line_settings, buf, 7); |
| } |
| |
| /* change control lines if we are switching to or from B0 */ |
| spin_lock_irqsave(&priv->lock, flags); |
| control = priv->line_control; |
| if (C_BAUD(tty) == B0) |
| priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); |
| else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) |
| priv->line_control |= (CONTROL_DTR | CONTROL_RTS); |
| if (control != priv->line_control) { |
| control = priv->line_control; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| pl2303_set_control_lines(port, control); |
| } else { |
| spin_unlock_irqrestore(&priv->lock, flags); |
| } |
| |
| if (C_CRTSCTS(tty)) { |
| if (spriv->quirks & PL2303_QUIRK_LEGACY) |
| pl2303_vendor_write(serial, 0x0, 0x41); |
| else |
| pl2303_vendor_write(serial, 0x0, 0x61); |
| } else if (I_IXON(tty) && !I_IXANY(tty) && START_CHAR(tty) == 0x11 && |
| STOP_CHAR(tty) == 0x13) { |
| pl2303_vendor_write(serial, 0x0, 0xc0); |
| } else { |
| pl2303_vendor_write(serial, 0x0, 0x0); |
| } |
| |
| kfree(buf); |
| } |
| |
| static void pl2303_dtr_rts(struct usb_serial_port *port, int on) |
| { |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| unsigned long flags; |
| u8 control; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| if (on) |
| priv->line_control |= (CONTROL_DTR | CONTROL_RTS); |
| else |
| priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); |
| control = priv->line_control; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| pl2303_set_control_lines(port, control); |
| } |
| |
| static void pl2303_close(struct usb_serial_port *port) |
| { |
| usb_serial_generic_close(port); |
| usb_kill_urb(port->interrupt_in_urb); |
| pl2303_set_break(port, false); |
| } |
| |
| static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) |
| { |
| struct usb_serial *serial = port->serial; |
| struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
| int result; |
| |
| if (spriv->quirks & PL2303_QUIRK_LEGACY) { |
| usb_clear_halt(serial->dev, port->write_urb->pipe); |
| usb_clear_halt(serial->dev, port->read_urb->pipe); |
| } else { |
| /* reset upstream data pipes */ |
| pl2303_vendor_write(serial, 8, 0); |
| pl2303_vendor_write(serial, 9, 0); |
| } |
| |
| /* Setup termios */ |
| if (tty) |
| pl2303_set_termios(tty, port, NULL); |
| |
| result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
| if (result) { |
| dev_err(&port->dev, "failed to submit interrupt urb: %d\n", |
| result); |
| return result; |
| } |
| |
| result = usb_serial_generic_open(tty, port); |
| if (result) { |
| usb_kill_urb(port->interrupt_in_urb); |
| return result; |
| } |
| |
| return 0; |
| } |
| |
| static int pl2303_tiocmset(struct tty_struct *tty, |
| unsigned int set, unsigned int clear) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| unsigned long flags; |
| u8 control; |
| int ret; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| if (set & TIOCM_RTS) |
| priv->line_control |= CONTROL_RTS; |
| if (set & TIOCM_DTR) |
| priv->line_control |= CONTROL_DTR; |
| if (clear & TIOCM_RTS) |
| priv->line_control &= ~CONTROL_RTS; |
| if (clear & TIOCM_DTR) |
| priv->line_control &= ~CONTROL_DTR; |
| control = priv->line_control; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| ret = pl2303_set_control_lines(port, control); |
| if (ret) |
| return usb_translate_errors(ret); |
| |
| return 0; |
| } |
| |
| static int pl2303_tiocmget(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| unsigned long flags; |
| unsigned int mcr; |
| unsigned int status; |
| unsigned int result; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| mcr = priv->line_control; |
| status = priv->line_status; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) |
| | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) |
| | ((status & UART_CTS) ? TIOCM_CTS : 0) |
| | ((status & UART_DSR) ? TIOCM_DSR : 0) |
| | ((status & UART_RING) ? TIOCM_RI : 0) |
| | ((status & UART_DCD) ? TIOCM_CD : 0); |
| |
| dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); |
| |
| return result; |
| } |
| |
| static int pl2303_carrier_raised(struct usb_serial_port *port) |
| { |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| |
| if (priv->line_status & UART_DCD) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int pl2303_ioctl(struct tty_struct *tty, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct serial_struct ser; |
| struct usb_serial_port *port = tty->driver_data; |
| |
| switch (cmd) { |
| case TIOCGSERIAL: |
| memset(&ser, 0, sizeof ser); |
| ser.type = PORT_16654; |
| ser.line = port->minor; |
| ser.port = port->port_number; |
| ser.baud_base = 460800; |
| |
| if (copy_to_user((void __user *)arg, &ser, sizeof ser)) |
| return -EFAULT; |
| |
| return 0; |
| default: |
| break; |
| } |
| |
| return -ENOIOCTLCMD; |
| } |
| |
| static void pl2303_set_break(struct usb_serial_port *port, bool enable) |
| { |
| struct usb_serial *serial = port->serial; |
| u16 state; |
| int result; |
| |
| if (enable) |
| state = BREAK_ON; |
| else |
| state = BREAK_OFF; |
| |
| dev_dbg(&port->dev, "%s - turning break %s\n", __func__, |
| state == BREAK_OFF ? "off" : "on"); |
| |
| result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
| BREAK_REQUEST, BREAK_REQUEST_TYPE, state, |
| 0, NULL, 0, 100); |
| if (result) |
| dev_err(&port->dev, "error sending break = %d\n", result); |
| } |
| |
| static void pl2303_break_ctl(struct tty_struct *tty, int state) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| |
| pl2303_set_break(port, state); |
| } |
| |
| static void pl2303_update_line_status(struct usb_serial_port *port, |
| unsigned char *data, |
| unsigned int actual_length) |
| { |
| struct usb_serial *serial = port->serial; |
| struct pl2303_serial_private *spriv = usb_get_serial_data(serial); |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| struct tty_struct *tty; |
| unsigned long flags; |
| unsigned int status_idx = UART_STATE_INDEX; |
| u8 status; |
| u8 delta; |
| |
| if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) |
| status_idx = 0; |
| |
| if (actual_length < status_idx + 1) |
| return; |
| |
| status = data[status_idx]; |
| |
| /* Save off the uart status for others to look at */ |
| spin_lock_irqsave(&priv->lock, flags); |
| delta = priv->line_status ^ status; |
| priv->line_status = status; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| if (status & UART_BREAK_ERROR) |
| usb_serial_handle_break(port); |
| |
| if (delta & UART_STATE_MSR_MASK) { |
| if (delta & UART_CTS) |
| port->icount.cts++; |
| if (delta & UART_DSR) |
| port->icount.dsr++; |
| if (delta & UART_RING) |
| port->icount.rng++; |
| if (delta & UART_DCD) { |
| port->icount.dcd++; |
| tty = tty_port_tty_get(&port->port); |
| if (tty) { |
| usb_serial_handle_dcd_change(port, tty, |
| status & UART_DCD); |
| tty_kref_put(tty); |
| } |
| } |
| |
| wake_up_interruptible(&port->port.delta_msr_wait); |
| } |
| } |
| |
| static void pl2303_read_int_callback(struct urb *urb) |
| { |
| struct usb_serial_port *port = urb->context; |
| unsigned char *data = urb->transfer_buffer; |
| unsigned int actual_length = urb->actual_length; |
| int status = urb->status; |
| int retval; |
| |
| switch (status) { |
| case 0: |
| /* success */ |
| break; |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| /* this urb is terminated, clean up */ |
| dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", |
| __func__, status); |
| return; |
| default: |
| dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", |
| __func__, status); |
| goto exit; |
| } |
| |
| usb_serial_debug_data(&port->dev, __func__, |
| urb->actual_length, urb->transfer_buffer); |
| |
| pl2303_update_line_status(port, data, actual_length); |
| |
| exit: |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| if (retval) { |
| dev_err(&port->dev, |
| "%s - usb_submit_urb failed with result %d\n", |
| __func__, retval); |
| } |
| } |
| |
| static void pl2303_process_read_urb(struct urb *urb) |
| { |
| struct usb_serial_port *port = urb->context; |
| struct pl2303_private *priv = usb_get_serial_port_data(port); |
| unsigned char *data = urb->transfer_buffer; |
| char tty_flag = TTY_NORMAL; |
| unsigned long flags; |
| u8 line_status; |
| int i; |
| |
| /* update line status */ |
| spin_lock_irqsave(&priv->lock, flags); |
| line_status = priv->line_status; |
| priv->line_status &= ~UART_STATE_TRANSIENT_MASK; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| if (!urb->actual_length) |
| return; |
| |
| /* |
| * Break takes precedence over parity, which takes precedence over |
| * framing errors. |
| */ |
| if (line_status & UART_BREAK_ERROR) |
| tty_flag = TTY_BREAK; |
| else if (line_status & UART_PARITY_ERROR) |
| tty_flag = TTY_PARITY; |
| else if (line_status & UART_FRAME_ERROR) |
| tty_flag = TTY_FRAME; |
| |
| if (tty_flag != TTY_NORMAL) |
| dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, |
| tty_flag); |
| /* overrun is special, not associated with a char */ |
| if (line_status & UART_OVERRUN_ERROR) |
| tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); |
| |
| if (port->port.console && port->sysrq) { |
| for (i = 0; i < urb->actual_length; ++i) |
| if (!usb_serial_handle_sysrq_char(port, data[i])) |
| tty_insert_flip_char(&port->port, data[i], |
| tty_flag); |
| } else { |
| tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, |
| urb->actual_length); |
| } |
| |
| tty_flip_buffer_push(&port->port); |
| } |
| |
| static struct usb_serial_driver pl2303_device = { |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "pl2303", |
| }, |
| .id_table = id_table, |
| .num_bulk_in = 1, |
| .num_bulk_out = 1, |
| .num_interrupt_in = 0, /* see pl2303_calc_num_ports */ |
| .bulk_in_size = 256, |
| .bulk_out_size = 256, |
| .open = pl2303_open, |
| .close = pl2303_close, |
| .dtr_rts = pl2303_dtr_rts, |
| .carrier_raised = pl2303_carrier_raised, |
| .ioctl = pl2303_ioctl, |
| .break_ctl = pl2303_break_ctl, |
| .set_termios = pl2303_set_termios, |
| .tiocmget = pl2303_tiocmget, |
| .tiocmset = pl2303_tiocmset, |
| .tiocmiwait = usb_serial_generic_tiocmiwait, |
| .process_read_urb = pl2303_process_read_urb, |
| .read_int_callback = pl2303_read_int_callback, |
| .probe = pl2303_probe, |
| .calc_num_ports = pl2303_calc_num_ports, |
| .attach = pl2303_startup, |
| .release = pl2303_release, |
| .port_probe = pl2303_port_probe, |
| .port_remove = pl2303_port_remove, |
| }; |
| |
| static struct usb_serial_driver * const serial_drivers[] = { |
| &pl2303_device, NULL |
| }; |
| |
| module_usb_serial_driver(serial_drivers, id_table); |
| |
| MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); |
| MODULE_LICENSE("GPL v2"); |