new file mode 100644
@@ -0,0 +1,2380 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * xrusb_serial.c
+ *
+ * Copyright (c) 2018 Patong Yang <patong.mxl@gmail.com>
+ *
+ * USB Serial Driver based on the cdc-acm.c driver for the
+ * MaxLinear/Exar USB UARTs/Serial adapters
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/log2.h>
+#include <linux/serial.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+#include <linux/usb.h>
+#include <linux/usb/cdc.h>
+#include <linux/dmi.h>
+#include <asm/byteorder.h>
+#include <asm/unaligned.h>
+#include <linux/idr.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <asm/io.h>
+#include <linux/gpio.h>
+
+#include "linux/version.h"
+#include "xrusb_serial.h"
+
+#define DRIVER_AUTHOR "Patong Yang <patong.mxl@gmail.com>"
+#define DRIVER_DESC "MaxLinear/Exar USB UART (serial port) driver"
+
+static struct usb_driver xrusb_driver;
+static struct tty_driver *xrusb_tty_driver;
+static struct xrusb *xrusb_table[XRUSB_TTY_MINORS];
+static struct reg_addr_map xr2280x_reg_map;
+static struct reg_addr_map xr21b1411_reg_map;
+static struct reg_addr_map xr21v141x_reg_map;
+static struct reg_addr_map xr21b142x_reg_map;
+
+static DEFINE_MUTEX(xrusb_table_lock);
+
+/*
+ * Look up an XRUSB structure by index. If found and not disconnected,
+ * increment its refcount and return it with its mutex held.
+ */
+
+static struct xrusb *xrusb_get_by_index(unsigned int index)
+{
+ struct xrusb *xrusb;
+
+ mutex_lock(&xrusb_table_lock);
+ xrusb = xrusb_table[index];
+ if (xrusb) {
+ mutex_lock(&xrusb->mutex);
+ if (xrusb->disconnected) {
+ mutex_unlock(&xrusb->mutex);
+ xrusb = NULL;
+ } else {
+ tty_port_get(&xrusb->port);
+ mutex_unlock(&xrusb->mutex);
+ }
+ }
+ mutex_unlock(&xrusb_table_lock);
+ return xrusb;
+}
+
+/*
+ * Try to find an available minor number and if found, associate it with
+ * 'xrusb'.
+ */
+static int xrusb_alloc_minor(struct xrusb *xrusb)
+{
+ int minor;
+
+ mutex_lock(&xrusb_table_lock);
+ for (minor = 0; minor < XRUSB_TTY_MINORS; minor++) {
+ if (!xrusb_table[minor]) {
+ xrusb_table[minor] = xrusb;
+ break;
+ }
+ }
+ mutex_unlock(&xrusb_table_lock);
+
+ return minor;
+}
+
+/* Release the minor number associated with 'xrusb'. */
+static void xrusb_release_minor(struct xrusb *xrusb)
+{
+ mutex_lock(&xrusb_table_lock);
+ xrusb_table[xrusb->minor] = NULL;
+ mutex_unlock(&xrusb_table_lock);
+}
+
+/*
+ * Functions for XRUSB control messages.
+ */
+
+static int xrusb_ctrl_msg(struct xrusb *xrusb,
+ int request, int value, void *buf, int len)
+{
+ int rv = usb_control_msg(xrusb->dev,
+ usb_sndctrlpipe(xrusb->dev, 0),
+ request,
+ USB_RT_XRUSB,
+ value,
+ xrusb->control->altsetting[0].desc.bInterfaceNumber,
+ buf,
+ len,
+ 5000);
+ return rv < 0 ? rv : 0;
+}
+
+int xrusb_set_reg(struct xrusb *xrusb, int regnum, int value)
+{
+ int result;
+ int channel = 0;
+ int XR2280xaddr = XR2280x_FUNC_MGR_OFFSET + regnum;
+
+ if ((xrusb->DeviceProduct & 0xfff0) == 0x1400) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR2280X, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR, // request_type
+ value, // request value
+ XR2280xaddr, // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1420) {
+ channel = (xrusb->channel - 4)*2;
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR21B142X, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR | 1, // request_type
+ value, // request value
+ regnum | (channel << 8), // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+ } else if (xrusb->DeviceProduct == 0x1411) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR21B1411, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR, // request_type
+ value, // request value
+ regnum, // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1410) {
+ if (xrusb->channel)
+ channel = xrusb->channel - 1;
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR21V141X, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR, // request_type
+ value, // request value
+ regnum | (channel << 8), // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+ } else {
+ result = -1;
+ }
+
+ if (result < 0) {
+ dev_err(&xrusb->control->dev, "%s Error:%d\n",
+ __func__, result);
+ }
+
+ return result;
+}
+
+int xrusb_set_reg_ext(struct xrusb *xrusb, int channel, int regnum, int value)
+{
+ int result;
+ int XR2280xaddr = XR2280x_FUNC_MGR_OFFSET + regnum;
+
+ if ((xrusb->DeviceProduct & 0xfff0) == 0x1400) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR2280X, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR, // request_type
+ value, // request value
+ XR2280xaddr, // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1420) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR21B142X, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR | 1, // request_type
+ value, // request value
+ regnum | (channel << 8), // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+ } else if (xrusb->DeviceProduct == 0x1411) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR21B1411, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR, // request_type
+ value, // request value
+ regnum, // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1410) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_sndctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_SET_XR21V141X, // request
+ USB_DIR_OUT | USB_TYPE_VENDOR, // request_type
+ value, // request value
+ regnum | (channel << 8), // index
+ NULL, // data
+ 0, // size
+ 5000); // timeout
+ } else {
+ result = -1;
+ }
+
+ if (result < 0) {
+ dev_err(&xrusb->control->dev, "%s Error:%d\n",
+ __func__, result);
+ }
+
+ return result;
+}
+
+
+int xrusb_get_reg(struct xrusb *xrusb, int regnum, short *value)
+{
+ int result;
+ int channel = 0;
+ int XR2280xaddr = XR2280x_FUNC_MGR_OFFSET + regnum;
+ void *dmadata = kmalloc(2, GFP_KERNEL);
+
+ if (!dmadata)
+ return -ENOMEM;
+
+ if ((xrusb->DeviceProduct & 0xfff0) == 0x1400) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR2280X, // request
+ USB_DIR_IN | USB_TYPE_VENDOR, // request_type
+ 0, // request value
+ XR2280xaddr, // index
+ dmadata, // data
+ 2, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 2);
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1420) {
+ channel = (xrusb->channel - 4)*2;
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR21B142X, // request
+ USB_DIR_IN | USB_TYPE_VENDOR | 1, // request_type
+ 0, // request value
+ regnum | (channel << 8), // index
+ dmadata, // data
+ 2, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 2);
+
+ } else if (xrusb->DeviceProduct == 0x1411) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR21B1411, // request
+ USB_DIR_IN | USB_TYPE_VENDOR, // request_type
+ 0, // request value
+ regnum, // index
+ dmadata, // data
+ 2, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 2);
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1410) {
+ if (xrusb->channel)
+ channel = xrusb->channel - 1;
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR21V141X, // request
+ USB_DIR_IN | USB_TYPE_VENDOR, // request_type
+ 0, // request value
+ regnum | (channel << 8), // index
+ dmadata, // data
+ 1, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 1);
+ } else {
+ result = -1;
+ }
+
+ if (result < 0) {
+ dev_err(&xrusb->control->dev,
+ "%s channel:%d Reg 0x%x Error:%d\n",
+ __func__, channel, regnum, result);
+ }
+ kfree(dmadata);
+ return result;
+}
+
+
+int xrusb_get_reg_ext(struct xrusb *xrusb, int channel,
+ int regnum, short *value)
+{
+ int result;
+ int XR2280xaddr = XR2280x_FUNC_MGR_OFFSET + regnum;
+ void *dmadata = kmalloc(2, GFP_KERNEL);
+
+ if (!dmadata)
+ return -ENOMEM;
+
+ if ((xrusb->DeviceProduct&0xfff0) == 0x1400) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR2280X, // request
+ USB_DIR_IN | USB_TYPE_VENDOR, // request_type
+ 0, // request value
+ XR2280xaddr, // index
+ dmadata, // data
+ 2, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 2);
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1420) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR21B142X, // request
+ USB_DIR_IN | USB_TYPE_VENDOR | 1, // request_type
+ 0, // request value
+ regnum | (channel << 8), // index
+ dmadata, // data
+ 2, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 2);
+ } else if (xrusb->DeviceProduct == 0x1411) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR21B1411, // request
+ USB_DIR_IN | USB_TYPE_VENDOR, // request_type
+ 0, // request value
+ regnum | (channel << 8), // index
+ dmadata, // data
+ 2, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 2);
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1410) {
+ result = usb_control_msg(xrusb->dev, // usb device
+ usb_rcvctrlpipe(xrusb->dev, 0), // endpoint pipe
+ XRUSB_GET_XR21V141X, // request
+ USB_DIR_IN | USB_TYPE_VENDOR, // request_type
+ 0, // request value
+ regnum | (channel << 8), // index
+ dmadata, // data
+ 1, // size
+ 5000); // timeout
+ memcpy(value, dmadata, 1);
+ } else {
+ result = -1;
+ }
+
+ if (result < 0) {
+ dev_err(&xrusb->control->dev, "%s Error:%d\n",
+ __func__, result);
+ }
+ kfree(dmadata);
+ return result;
+}
+
+struct xr21v141x_baud_rate {
+ unsigned int tx;
+ unsigned int rx0;
+ unsigned int rx1; };
+
+static struct xr21v141x_baud_rate xr21v141x_baud_rates[] = {
+ { 0x000, 0x000, 0x000 },
+ { 0x000, 0x000, 0x000 },
+ { 0x100, 0x000, 0x100 },
+ { 0x020, 0x400, 0x020 },
+ { 0x010, 0x100, 0x010 },
+ { 0x208, 0x040, 0x208 },
+ { 0x104, 0x820, 0x108 },
+ { 0x844, 0x210, 0x884 },
+ { 0x444, 0x110, 0x444 },
+ { 0x122, 0x888, 0x224 },
+ { 0x912, 0x448, 0x924 },
+ { 0x492, 0x248, 0x492 },
+ { 0x252, 0x928, 0x292 },
+ { 0X94A, 0X4A4, 0XA52 },
+ { 0X52A, 0XAA4, 0X54A },
+ { 0XAAA, 0x954, 0X4AA },
+ { 0XAAA, 0x554, 0XAAA },
+ { 0x555, 0XAD4, 0X5AA },
+ { 0XB55, 0XAB4, 0X55A },
+ { 0X6B5, 0X5AC, 0XB56 },
+ { 0X5B5, 0XD6C, 0X6D6 },
+ { 0XB6D, 0XB6A, 0XDB6 },
+ { 0X76D, 0X6DA, 0XBB6 },
+ { 0XEDD, 0XDDA, 0X76E },
+ { 0XDDD, 0XBBA, 0XEEE },
+ { 0X7BB, 0XF7A, 0XDDE },
+ { 0XF7B, 0XEF6, 0X7DE },
+ { 0XDF7, 0XBF6, 0XF7E },
+ { 0X7F7, 0XFEE, 0XEFE },
+ { 0XFDF, 0XFBE, 0X7FE },
+ { 0XF7F, 0XEFE, 0XFFE },
+ { 0XFFF, 0XFFE, 0XFFD },
+};
+
+
+static int xr21v141x_set_baud_rate(struct xrusb *xrusb, unsigned int rate)
+{
+ unsigned int divisor = 48000000 / rate;
+ unsigned int i = ((32 * 48000000) / rate) & 0x1f;
+ unsigned int tx_mask = xr21v141x_baud_rates[i].tx;
+ unsigned int rx_mask = (divisor & 1) ?
+ xr21v141x_baud_rates[i].rx1 :
+ xr21v141x_baud_rates[i].rx0;
+
+ xrusb_set_reg(xrusb, XR21V141X_CLOCK_DIVISOR_0, (divisor >> 0) & 0xff);
+ xrusb_set_reg(xrusb, XR21V141X_CLOCK_DIVISOR_1, (divisor >> 8) & 0xff);
+ xrusb_set_reg(xrusb, XR21V141X_CLOCK_DIVISOR_2, (divisor >> 16) & 0xff);
+ xrusb_set_reg(xrusb, XR21V141X_TX_CLOCK_MASK_0, (tx_mask >> 0) & 0xff);
+ xrusb_set_reg(xrusb, XR21V141X_TX_CLOCK_MASK_1, (tx_mask >> 8) & 0xff);
+ xrusb_set_reg(xrusb, XR21V141X_RX_CLOCK_MASK_0, (rx_mask >> 0) & 0xff);
+ xrusb_set_reg(xrusb, XR21V141X_RX_CLOCK_MASK_1, (rx_mask >> 8) & 0xff);
+
+ return 0;
+}
+
+/* devices aren't required to support these requests.
+ * the cdc xrusb descriptor tells whether they do...
+ */
+int xrusb_set_control(struct xrusb *xrusb, unsigned int control)
+{
+ int rv = 0;
+
+ // Use custom vendor request for XR21V1410/12/14
+ if ((xrusb->DeviceProduct & 0x1411) == 0x1410) {
+ if (control & XRUSB_CTRL_DTR) {
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_clr,
+ UART_GPIO_CLR_DTR);
+ } else {
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_set,
+ UART_GPIO_SET_DTR);
+ }
+
+ if (control & XRUSB_CTRL_RTS) {
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_clr,
+ UART_GPIO_CLR_RTS);
+ } else {
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_set,
+ UART_GPIO_SET_RTS);
+ }
+ } else {
+ // Use CDC command for XR21B14xx and XR2280x
+ rv = xrusb_ctrl_msg(xrusb,
+ USB_CDC_REQ_SET_CONTROL_LINE_STATE,
+ control,
+ NULL,
+ 0);
+ }
+ return rv;
+}
+
+int xrusb_set_line(struct xrusb *xrusb, struct usb_cdc_line_coding *line)
+{
+ int rv = 0;
+ unsigned int data_size, data_parity, data_stop, format;
+
+ // Use custom vendor request for XR21V1410/12/14
+ if ((xrusb->DeviceProduct & 0x1411) == 0x1410) {
+ xr21v141x_set_baud_rate(xrusb, line->dwDTERate);
+ data_size = line->bDataBits;
+ data_parity = line->bParityType;
+ data_stop = line->bCharFormat;
+ format = data_size | (data_parity << 4) | (data_stop << 7);
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_format, format);
+ }
+ // Use CDC command for XR21B14xx and XR2280x
+ else
+ rv = xrusb_ctrl_msg(xrusb,
+ USB_CDC_REQ_SET_LINE_CODING,
+ 0,
+ line,
+ sizeof *(line));
+
+ return rv;
+}
+
+int xrusb_set_flow_mode(struct xrusb *xrusb,
+ struct tty_struct *tty, unsigned int cflag)
+{
+ unsigned int flow;
+ unsigned int gpio_mode;
+ short gpio_mode_reg;
+
+ xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_mode, &gpio_mode_reg);
+ gpio_mode = gpio_mode_reg;
+ if (cflag & CRTSCTS) {
+ flow = UART_FLOW_MODE_HW;
+ gpio_mode |= UART_GPIO_MODE_SEL_RTS_CTS;
+ } else if (I_IXOFF(tty) || I_IXON(tty)) {
+ unsigned char start_char = START_CHAR(tty);
+ unsigned char stop_char = STOP_CHAR(tty);
+
+ flow = UART_FLOW_MODE_SW;
+ gpio_mode |= UART_GPIO_MODE_SEL_GPIO;
+
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_xon_char, start_char);
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_xoff_char, stop_char);
+ } else {
+ flow = UART_FLOW_MODE_NONE;
+ }
+
+ // Mode configured in BIOS for Caracalla
+ // Do nothing for xrusb_set_flow_mode
+ if (xrusb->found_smbios_caracalla_config)
+ return 0;
+
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_flow, flow);
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_mode, gpio_mode);
+
+ return 0;
+}
+
+int xrusb_send_break(struct xrusb *xrusb, int state)
+{
+ int rv = 0;
+
+ // Use custom vendor request for XR21V1410/12/14
+ if ((xrusb->DeviceProduct & 0x1411) == 0x1410) {
+ if (state) {
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_tx_break,
+ 0xffff);
+ } else {
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_tx_break,
+ 0);
+ }
+ } else {// Use CDC command for XR21B14xx and XR2280x
+ rv = xrusb_ctrl_msg(xrusb,
+ USB_CDC_REQ_SEND_BREAK,
+ state,
+ NULL,
+ 0);
+ }
+ return rv;
+}
+
+int xrusb_enable(struct xrusb *xrusb)
+{
+ int rv = 0;
+ int channel = xrusb->channel;
+
+ if (channel)
+ channel--;
+
+ if ((xrusb->DeviceProduct & 0x1411) == 0x1410) {
+ rv = xrusb_set_reg_ext(xrusb,
+ XR21V141x_URM_REG_BLOCK,
+ XR21V141x_URM_FIFO_ENABLE_REG + channel,
+ XR21V141x_URM_ENABLE_TX_FIFO);
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_enable,
+ UART_ENABLE_TX | UART_ENABLE_RX);
+ rv = xrusb_set_reg_ext(xrusb,
+ XR21V141x_URM_REG_BLOCK,
+ XR21V141x_URM_FIFO_ENABLE_REG + channel,
+ XR21V141x_URM_ENABLE_TX_FIFO |
+ XR21V141x_URM_ENABLE_RX_FIFO);
+ } else {
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_enable,
+ UART_ENABLE_TX | UART_ENABLE_RX);
+ }
+
+ return rv;
+}
+
+int xrusb_disable(struct xrusb *xrusb)
+{
+ int rv = 0;
+ int channel = xrusb->channel;
+
+ if (channel)
+ channel--;
+
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_enable, 0);
+
+ if ((xrusb->DeviceProduct & 0x1411) == 0x1410) {
+ rv = xrusb_set_reg_ext(xrusb,
+ XR21V141x_URM_REG_BLOCK,
+ XR21V141x_URM_FIFO_ENABLE_REG + channel, 0);
+ }
+
+ return rv;
+}
+
+int xrusb_fifo_reset(struct xrusb *xrusb)
+{
+ int rv = 0;
+ int channel = xrusb->channel;
+
+ if (channel)
+ channel--;
+ if ((xrusb->DeviceProduct & 0x1411) == 0x1410) {
+ rv = xrusb_set_reg_ext(xrusb,
+ XR21V141x_URM_REG_BLOCK,
+ XR21V141x_URM_RX_FIFO_RESET + channel,
+ 0xff);
+ rv |= xrusb_set_reg_ext(xrusb,
+ XR21V141x_URM_REG_BLOCK,
+ XR21V141x_URM_TX_FIFO_RESET + channel,
+ 0xff);
+ } else
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_enable,
+ UART_ENABLE_TX | UART_ENABLE_RX);
+
+ return rv;
+}
+
+int xrusb_set_wide_mode(struct xrusb *xrusb, int wide_mode)
+{
+ int rv = 0;
+ int channel = xrusb->channel;
+
+ xrusb_disable(xrusb);
+
+ if ((xrusb->DeviceProduct & 0xFFF0) == 0x1400) {
+ xrusb_set_reg(xrusb, XR2280X_TX_WIDE_MODE_REG, wide_mode);
+ xrusb_set_reg(xrusb, XR2280X_RX_WIDE_MODE_REG, wide_mode);
+ } else if ((xrusb->DeviceProduct & 0xFFF0) == 0x1420) {
+ xrusb_set_reg(xrusb, XR21B142X_TX_WIDE_MODE_REG, wide_mode);
+ xrusb_set_reg(xrusb, XR21B142X_RX_WIDE_MODE_REG, wide_mode);
+ } else if (xrusb->DeviceProduct == 0x1411) {
+ xrusb_set_reg(xrusb, XR21B1411_WIDE_MODE_REG, wide_mode);
+ } else if ((xrusb->DeviceProduct & 0xFFF0) == 0x1410) {
+ if (channel)
+ channel--;
+ xrusb_set_reg_ext(xrusb,
+ XR21V141x_UART_CUSTOM_BLOCK,
+ channel*8 + XR21V141X_WIDE_MODE_REG,
+ wide_mode);
+ }
+
+ xrusb_enable(xrusb);
+ return rv;
+}
+
+int xrusb_gpio_dir_out(struct xrusb *xrusb, int gpio_mask)
+{
+ int rv = 0;
+ short reg_value;
+
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_dir, ®_value);
+ if (rv < 0)
+ return -EFAULT;
+
+ reg_value |= gpio_mask;
+
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_dir, reg_value);
+ if (rv < 0)
+ return -EFAULT;
+
+ return rv;
+}
+
+int xrusb_gpio_dir_in(struct xrusb *xrusb, int gpio_mask)
+{
+ int rv = 0;
+ short reg_value;
+
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_dir, ®_value);
+ if (rv < 0)
+ return -EFAULT;
+
+ gpio_mask = ~gpio_mask;
+ reg_value &= gpio_mask;
+
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_dir, reg_value);
+ if (rv < 0)
+ return -EFAULT;
+
+ return rv;
+}
+
+static int xrusb_tiocmget(struct xrusb *xrusb)
+
+{
+ short data;
+ int result;
+
+ result = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_status, &data);
+
+ if (result) {
+ return ((data & 0x8) ? 0 : TIOCM_DTR) |
+ ((data & 0x20) ? 0 : TIOCM_RTS) |
+ ((data & 0x4) ? 0 : TIOCM_DSR) |
+ ((data & 0x1) ? 0 : TIOCM_RI) |
+ ((data & 0x2) ? 0 : TIOCM_CD) |
+ ((data & 0x10) ? 0 : TIOCM_CTS);
+ } else {
+ return -EFAULT;
+ }
+}
+
+static int xrusb_tiocmset(struct xrusb *xrusb,
+ unsigned int set, unsigned int clear)
+{
+
+ unsigned int newctrl = 0;
+
+ newctrl = xrusb->ctrlout;
+ set = (set & TIOCM_DTR ? XRUSB_CTRL_DTR : 0) |
+ (set & TIOCM_RTS ? XRUSB_CTRL_RTS : 0);
+ clear = (clear & TIOCM_DTR ? XRUSB_CTRL_DTR : 0) |
+ (clear & TIOCM_RTS ? XRUSB_CTRL_RTS : 0);
+ newctrl = (newctrl & ~clear) | set;
+
+ if (xrusb->ctrlout == newctrl)
+ return 0;
+
+ xrusb->ctrlout = newctrl;
+
+ if (newctrl & XRUSB_CTRL_DTR) {
+ xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_gpio_clr,
+ UART_GPIO_CLR_DTR);
+ } else {
+ xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_gpio_set,
+ UART_GPIO_SET_DTR);
+ }
+
+ if (newctrl & XRUSB_CTRL_RTS) {
+ xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_gpio_clr,
+ UART_GPIO_CLR_RTS);
+ } else {
+ xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_gpio_set,
+ UART_GPIO_SET_RTS);
+ }
+
+ return 0;
+}
+
+static void init_xr2280x_reg_map(void)
+{
+ xr2280x_reg_map.uart_enable = 0x40;
+ xr2280x_reg_map.uart_flow = 0x46;
+ xr2280x_reg_map.uart_xon_char = 0x47;
+ xr2280x_reg_map.uart_xoff_char = 0x48;
+ xr2280x_reg_map.uart_tx_break = 0x4a;
+ xr2280x_reg_map.uart_rs485_delay = 0x4b;
+ xr2280x_reg_map.uart_gpio_mode = 0x4c;
+ xr2280x_reg_map.uart_gpio_dir = 0x4d;
+ xr2280x_reg_map.uart_gpio_set = 0x4e;
+ xr2280x_reg_map.uart_gpio_clr = 0x4f;
+ xr2280x_reg_map.uart_gpio_status = 0x50;
+ xr2280x_reg_map.uart_gpio_int_mask = 0x51;
+ xr2280x_reg_map.uart_customized_int = 0x52;
+ xr2280x_reg_map.uart_gpio_pull_up_enable = 0x54;
+ xr2280x_reg_map.uart_gpio_pull_down_enable = 0x55;
+ xr2280x_reg_map.uart_loopback = 0x56;
+ xr2280x_reg_map.uart_low_latency = 0x66;
+ xr2280x_reg_map.uart_custom_driver = 0x81;
+}
+
+static void init_xr21b1411_reg_map(void)
+{
+ xr21b1411_reg_map.uart_enable = 0xc00;
+ xr21b1411_reg_map.uart_flow = 0xc06;
+ xr21b1411_reg_map.uart_xon_char = 0xc07;
+ xr21b1411_reg_map.uart_xoff_char = 0xc08;
+ xr21b1411_reg_map.uart_tx_break = 0xc0a;
+ xr21b1411_reg_map.uart_rs485_delay = 0xc0b;
+ xr21b1411_reg_map.uart_gpio_mode = 0xc0c;
+ xr21b1411_reg_map.uart_gpio_dir = 0xc0d;
+ xr21b1411_reg_map.uart_gpio_set = 0xc0e;
+ xr21b1411_reg_map.uart_gpio_clr = 0xc0f;
+ xr21b1411_reg_map.uart_gpio_status = 0xc10;
+ xr21b1411_reg_map.uart_gpio_int_mask = 0xc11;
+ xr21b1411_reg_map.uart_customized_int = 0xc12;
+ xr21b1411_reg_map.uart_gpio_pull_up_enable = 0xc14;
+ xr21b1411_reg_map.uart_gpio_pull_down_enable = 0xc15;
+ xr21b1411_reg_map.uart_loopback = 0xc16;
+ xr21b1411_reg_map.uart_low_latency = 0xcc2;
+ xr21b1411_reg_map.uart_custom_driver = 0x20d;
+}
+
+static void init_xr21v141x_reg_map(void)
+{
+ xr21v141x_reg_map.uart_enable = 0x03;
+ xr21v141x_reg_map.uart_format = 0x0b;
+ xr21v141x_reg_map.uart_flow = 0x0c;
+ xr21v141x_reg_map.uart_xon_char = 0x10;
+ xr21v141x_reg_map.uart_xoff_char = 0x11;
+ xr21v141x_reg_map.uart_loopback = 0x12;
+ xr21v141x_reg_map.uart_tx_break = 0x14;
+ xr21v141x_reg_map.uart_rs485_delay = 0x15;
+ xr21v141x_reg_map.uart_gpio_mode = 0x1a;
+ xr21v141x_reg_map.uart_gpio_dir = 0x1b;
+ xr21v141x_reg_map.uart_gpio_int_mask = 0x1c;
+ xr21v141x_reg_map.uart_gpio_set = 0x1d;
+ xr21v141x_reg_map.uart_gpio_clr = 0x1e;
+ xr21v141x_reg_map.uart_gpio_status = 0x1f;
+}
+
+static void init_xr21b142x_reg_map(void)
+{
+ xr21b142x_reg_map.uart_enable = 0x00;
+ xr21b142x_reg_map.uart_flow = 0x06;
+ xr21b142x_reg_map.uart_xon_char = 0x07;
+ xr21b142x_reg_map.uart_xoff_char = 0x08;
+ xr21b142x_reg_map.uart_tx_break = 0x0a;
+ xr21b142x_reg_map.uart_rs485_delay = 0x0b;
+ xr21b142x_reg_map.uart_gpio_mode = 0x0c;
+ xr21b142x_reg_map.uart_gpio_dir = 0x0d;
+ xr21b142x_reg_map.uart_gpio_set = 0x0e;
+ xr21b142x_reg_map.uart_gpio_clr = 0x0f;
+ xr21b142x_reg_map.uart_gpio_status = 0x10;
+ xr21b142x_reg_map.uart_gpio_int_mask = 0x11;
+ xr21b142x_reg_map.uart_customized_int = 0x12;
+ xr21b142x_reg_map.uart_gpio_open_drain = 0x13;
+ xr21b142x_reg_map.uart_gpio_pull_up_enable = 0x14;
+ xr21b142x_reg_map.uart_gpio_pull_down_enable = 0x15;
+ xr21b142x_reg_map.uart_loopback = 0x16;
+ xr21b142x_reg_map.uart_custom_driver = 0x60;
+ xr21b142x_reg_map.uart_low_latency = 0x46;
+}
+
+int xrusb_reg_init(struct xrusb *xrusb)
+{
+ int rv = 0, gpio_mode = 0;
+
+ init_xr2280x_reg_map();
+ init_xr21b142x_reg_map();
+ init_xr21b1411_reg_map();
+ init_xr21v141x_reg_map();
+
+ if ((xrusb->DeviceProduct & 0xfff0) == 0x1400) {
+ memcpy(&(xrusb->reg_map), &xr2280x_reg_map,
+ sizeof(struct reg_addr_map));
+ } else if ((xrusb->DeviceProduct & 0xFFF0) == 0x1420) {
+ memcpy(&(xrusb->reg_map), &xr21b142x_reg_map,
+ sizeof(struct reg_addr_map));
+ } else if (xrusb->DeviceProduct == 0x1411) {
+ memcpy(&(xrusb->reg_map), &xr21b1411_reg_map,
+ sizeof(struct reg_addr_map));
+ } else if ((xrusb->DeviceProduct & 0xfff0) == 0x1410) {
+ memcpy(&(xrusb->reg_map), &xr21v141x_reg_map,
+ sizeof(struct reg_addr_map));
+ } else {
+ rv = -1;
+ }
+
+ if (xrusb->reg_map.uart_custom_driver)
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_custom_driver, 1);
+
+ // Enable TXT and RXT function for XR21B1420/22/24
+ if ((xrusb->DeviceProduct & 0xfff0) == 0x1420)
+ gpio_mode |= 0x300;
+
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_mode, gpio_mode);
+
+ // Enable RTS and DTR as outputs and high (de-asserted)
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_dir, 0x28);
+ xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_set,
+ UART_GPIO_SET_DTR | UART_GPIO_SET_RTS);
+
+ return rv;
+}
+
+/*
+ * Write buffer management.
+ * All of these assume proper locks taken by the caller.
+ */
+
+static int xrusb_wb_alloc(struct xrusb *xrusb)
+{
+ int i, wbn;
+ struct xrusb_wb *wb;
+
+ wbn = 0;
+ i = 0;
+ for (;;) {
+ wb = &xrusb->wb[wbn];
+ if (!wb->use) {
+ wb->use = 1;
+ return wbn;
+ }
+ wbn = (wbn + 1) % XRUSB_NW;
+ if (++i >= XRUSB_NW)
+ return -1;
+ }
+}
+
+static int xrusb_wb_is_avail(struct xrusb *xrusb)
+{
+ int i, n;
+ unsigned long flags;
+
+ n = XRUSB_NW;
+ spin_lock_irqsave(&xrusb->write_lock, flags);
+ for (i = 0; i < XRUSB_NW; i++)
+ n -= xrusb->wb[i].use;
+ spin_unlock_irqrestore(&xrusb->write_lock, flags);
+ return n;
+}
+
+/*
+ * Finish write. Caller must hold xrusb->write_lock
+ */
+static void xrusb_write_done(struct xrusb *xrusb,
+ struct xrusb_wb *wb)
+{
+ wb->use = 0;
+ xrusb->transmitting--;
+ usb_autopm_put_interface_async(xrusb->control);
+}
+
+/*
+ * Poke write.
+ *
+ * the caller is responsible for locking
+ */
+
+static int xrusb_start_wb(struct xrusb *xrusb, struct xrusb_wb *wb)
+{
+ int rc;
+
+ xrusb->transmitting++;
+
+ wb->urb->transfer_buffer = wb->buf;
+ wb->urb->transfer_dma = wb->dmah;
+ wb->urb->transfer_buffer_length = wb->len;
+ wb->urb->dev = xrusb->dev;
+
+ rc = usb_submit_urb(wb->urb, GFP_ATOMIC);
+ if (rc < 0) {
+ dev_err(&xrusb->data->dev,
+ "%s - usb_submit_urb(write bulk) failed: %d\n",
+ __func__, rc);
+ xrusb_write_done(xrusb, wb);
+ }
+ return rc;
+}
+
+/*
+ * attributes exported through sysfs
+ */
+
+static ssize_t bmCapabilities_show
+(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct xrusb *xrusb = usb_get_intfdata(intf);
+
+ return sprintf(buf, "%d", xrusb->ctrl_caps);
+}
+static DEVICE_ATTR_RO(bmCapabilities);
+
+/*
+ * Interrupt handlers for various XRUSB device responses
+ */
+
+/* control interface reports status changes with "interrupt" transfers */
+static void xrusb_ctrl_irq(struct urb *urb)
+{
+ struct xrusb *xrusb = urb->context;
+
+ int rv;
+ int status = urb->status;
+ unsigned char *p;
+
+ switch (status) {
+ case 0:
+ p = (unsigned char *)(urb->transfer_buffer);
+ /* success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* this urb is terminated, clean up */
+
+ return;
+ default:
+ break;
+ }
+
+ rv = usb_submit_urb(urb, GFP_ATOMIC);
+ if (rv && rv != -EPERM && rv != -ENODEV) {
+ dev_err(&xrusb->control->dev,
+ "%s - usb_submit_urb failed: %d\n", __func__, rv);
+ }
+}
+
+static int xrusb_submit_read_urb(struct xrusb *xrusb, int index,
+ gfp_t mem_flags)
+{
+ int res;
+
+ if (!test_and_clear_bit(index, &xrusb->read_urbs_free))
+ return 0;
+
+ res = usb_submit_urb(xrusb->read_urbs[index], mem_flags);
+ if (res) {
+ if (res != -EPERM && res != -ENODEV) {
+ dev_err(&xrusb->data->dev, "%s - usb_submit_urb failed: %d\n",
+ __func__, res);
+ }
+ set_bit(index, &xrusb->read_urbs_free);
+ return res;
+ }
+
+ return 0;
+}
+
+static int xrusb_submit_read_urbs(struct xrusb *xrusb, gfp_t mem_flags)
+{
+ int res;
+ int i;
+
+ for (i = 0; i < xrusb->rx_buflimit; ++i) {
+ res = xrusb_submit_read_urb(xrusb, i, mem_flags);
+ if (res)
+ return res;
+ }
+
+ return 0;
+}
+
+static void xrusb_process_read_urb(struct xrusb *xrusb, struct urb *urb)
+{
+ int wide_mode = xrusb->wide_mode;
+ int have_extra_byte;
+ int length;
+
+ if (xrusb->uart_type == 0)
+ return;
+ if (!urb->actual_length)
+ return;
+
+ if (wide_mode) {
+ char *dp = urb->transfer_buffer;
+ int i, ch, ch_flags;
+
+ length = urb->actual_length;
+ length = length + (xrusb->have_extra_byte ? 1 : 0);
+ have_extra_byte = (wide_mode && (length & 1));
+ length = (wide_mode) ? (length / 2) : length;
+ for (i = 0; i < length; ++i) {
+ char tty_flag;
+
+ if (i == 0)
+ if (xrusb->have_extra_byte)
+ ch = xrusb->extra_byte;
+ else
+ ch = *dp++;
+ else
+ ch = *dp++;
+
+ ch_flags = *dp++;
+ if (ch_flags & WIDE_MODE_PARITY)
+ tty_flag = TTY_PARITY;
+ else if (ch_flags & WIDE_MODE_BREAK)
+ tty_flag = TTY_BREAK;
+ else if (ch_flags & WIDE_MODE_FRAME)
+ tty_flag = TTY_FRAME;
+ else if (ch_flags & WIDE_MODE_OVERRUN)
+ tty_flag = TTY_OVERRUN;
+ else
+ tty_flag = TTY_NORMAL;
+
+ tty_insert_flip_char(&xrusb->port, ch, tty_flag);
+ tty_flip_buffer_push(&xrusb->port);
+ }
+ } else {
+ tty_insert_flip_string(&xrusb->port,
+ urb->transfer_buffer, urb->actual_length);
+ tty_flip_buffer_push(&xrusb->port);
+ }
+}
+
+static void xrusb_read_bulk_callback(struct urb *urb)
+{
+ struct xrusb_rb *rb = urb->context;
+ struct xrusb *xrusb = rb->instance;
+ unsigned long flags;
+
+ set_bit(rb->index, &xrusb->read_urbs_free);
+
+ if (!xrusb->dev) {
+ dev_dbg(&xrusb->data->dev, "%s - disconnected\n", __func__);
+ return;
+ }
+ usb_mark_last_busy(xrusb->dev);
+ xrusb_process_read_urb(xrusb, urb);
+
+ /* throttle device if requested by tty */
+ spin_lock_irqsave(&xrusb->read_lock, flags);
+ xrusb->throttled = xrusb->throttle_req;
+ if (!xrusb->throttled && !xrusb->susp_count) {
+ spin_unlock_irqrestore(&xrusb->read_lock, flags);
+ xrusb_submit_read_urb(xrusb,
+ rb->index, GFP_ATOMIC);
+ } else {
+ spin_unlock_irqrestore(&xrusb->read_lock, flags);
+ }
+}
+
+/* data interface wrote those outgoing bytes */
+static void xrusb_write_bulk(struct urb *urb)
+{
+ struct xrusb_wb *wb = urb->context;
+ struct xrusb *xrusb = wb->instance;
+ unsigned long flags;
+
+ spin_lock_irqsave(&xrusb->write_lock, flags);
+ xrusb_write_done(xrusb, wb);
+ spin_unlock_irqrestore(&xrusb->write_lock, flags);
+ schedule_work(&xrusb->work);
+}
+
+static void xrusb_softint(struct work_struct *work)
+{
+ struct xrusb *xrusb = container_of(work, struct xrusb, work);
+
+ tty_port_tty_wakeup(&xrusb->port);
+}
+
+/*
+ * TTY handlers
+ */
+
+static int xrusb_tty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ struct xrusb *xrusb;
+ int rv;
+
+ xrusb = xrusb_get_by_index(tty->index);
+ if (!xrusb)
+ return -ENODEV;
+
+ rv = tty_standard_install(driver, tty);
+ if (rv)
+ goto error_init_termios;
+
+ tty->driver_data = xrusb;
+
+ return 0;
+
+error_init_termios:
+ tty_port_put(&xrusb->port);
+ return rv;
+}
+
+static int xrusb_tty_open(struct tty_struct *tty, struct file *filp)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ int result;
+
+ result = xrusb_fifo_reset(xrusb);
+
+ return tty_port_open(&xrusb->port, tty, filp);
+}
+
+static int xrusb_port_activate(struct tty_port *port, struct tty_struct *tty)
+{
+ struct xrusb *xrusb = container_of(port, struct xrusb, port);
+ int rv = -ENODEV;
+
+ mutex_lock(&xrusb->mutex);
+ if (xrusb->disconnected)
+ goto disconnected;
+
+ rv = usb_autopm_get_interface(xrusb->control);
+ if (rv)
+ goto error_get_interface;
+
+ set_bit(TTY_NO_WRITE_SPLIT, &tty->flags);
+ xrusb->control->needs_remote_wakeup = 1;
+
+ xrusb->ctrlurb->dev = xrusb->dev;
+ if (usb_submit_urb(xrusb->ctrlurb, GFP_KERNEL)) {
+ dev_err(&xrusb->control->dev,
+ "%s - usb_submit_urb(ctrl irq) failed\n", __func__);
+ goto error_submit_urb;
+ }
+
+ xrusb->ctrlout = XRUSB_CTRL_DTR | XRUSB_CTRL_RTS;
+ if (xrusb_set_control(xrusb, xrusb->ctrlout) < 0
+ && (xrusb->ctrl_caps & USB_CDC_CAP_LINE)) {
+ goto error_set_control;
+ }
+
+ usb_autopm_put_interface(xrusb->control);
+
+ /*
+ * Unthrottle device in case the TTY was closed while throttled.
+ */
+ spin_lock_irq(&xrusb->read_lock);
+ xrusb->throttled = 0;
+ xrusb->throttle_req = 0;
+ spin_unlock_irq(&xrusb->read_lock);
+
+ if (xrusb_submit_read_urbs(xrusb, GFP_KERNEL))
+ goto error_submit_read_urbs;
+
+ mutex_unlock(&xrusb->mutex);
+
+ return 0;
+
+error_submit_read_urbs:
+ xrusb->ctrlout = 0;
+ xrusb_set_control(xrusb, xrusb->ctrlout);
+error_set_control:
+ usb_kill_urb(xrusb->ctrlurb);
+error_submit_urb:
+ usb_autopm_put_interface(xrusb->control);
+error_get_interface:
+disconnected:
+ mutex_unlock(&xrusb->mutex);
+ return rv;
+}
+
+static void xrusb_port_destruct(struct tty_port *port)
+{
+ struct xrusb *xrusb = container_of(port, struct xrusb, port);
+
+#ifdef CONFIG_GPIOLIB
+ if (xrusb->rv_gpio_created == 0)
+ gpiochip_remove(&xrusb->xr_gpio);
+#endif
+ xrusb_release_minor(xrusb);
+ usb_put_intf(xrusb->control);
+ kfree(xrusb);
+}
+
+static void xrusb_port_shutdown(struct tty_port *port)
+{
+ struct xrusb *xrusb = container_of(port, struct xrusb, port);
+ int i;
+
+ mutex_lock(&xrusb->mutex);
+ if (!xrusb->disconnected) {
+ usb_autopm_get_interface(xrusb->control);
+ xrusb_set_control(xrusb,
+ xrusb->ctrlout = 0);
+ usb_kill_urb(xrusb->ctrlurb);
+ for (i = 0; i < XRUSB_NW; i++)
+ usb_kill_urb(xrusb->wb[i].urb);
+ for (i = 0; i < xrusb->rx_buflimit; i++)
+ usb_kill_urb(xrusb->read_urbs[i]);
+ xrusb->control->needs_remote_wakeup = 0;
+ usb_autopm_put_interface(xrusb->control);
+ }
+ mutex_unlock(&xrusb->mutex);
+}
+
+static void xrusb_tty_cleanup(struct tty_struct *tty)
+{
+ struct xrusb *xrusb = tty->driver_data;
+
+ tty_port_put(&xrusb->port);
+}
+
+static void xrusb_tty_hangup(struct tty_struct *tty)
+{
+ struct xrusb *xrusb = tty->driver_data;
+
+ tty_port_hangup(&xrusb->port);
+}
+
+static void xrusb_tty_close(struct tty_struct *tty, struct file *filp)
+{
+ struct xrusb *xrusb = tty->driver_data;
+
+ tty_port_close(&xrusb->port, tty, filp);
+}
+
+static int xrusb_tty_write(struct tty_struct *tty,
+ const unsigned char *buf, int count)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ int stat;
+ unsigned long flags;
+ int wbn;
+ struct xrusb_wb *wb;
+
+ if (xrusb->uart_type == 0)
+ return -EIO;
+
+ if (!count)
+ return 0;
+
+ spin_lock_irqsave(&xrusb->write_lock, flags);
+ wbn = xrusb_wb_alloc(xrusb);
+ if (wbn < 0) {
+ spin_unlock_irqrestore(&xrusb->write_lock, flags);
+ return 0;
+ }
+ wb = &xrusb->wb[wbn];
+
+ if (!xrusb->dev) {
+ wb->use = 0;
+ spin_unlock_irqrestore(&xrusb->write_lock, flags);
+ return -ENODEV;
+ }
+
+ count = (count > xrusb->writesize) ? xrusb->writesize : count;
+ memcpy(wb->buf, buf, count);
+ wb->len = count;
+
+ usb_autopm_get_interface_async(xrusb->control);
+ if (xrusb->susp_count) {
+ if (!xrusb->delayed_wb)
+ xrusb->delayed_wb = wb;
+ else
+ usb_autopm_put_interface_async(xrusb->control);
+
+ spin_unlock_irqrestore(&xrusb->write_lock, flags);
+ return count; /* A white lie */
+ }
+ usb_mark_last_busy(xrusb->dev);
+
+ stat = xrusb_start_wb(xrusb, wb);
+ spin_unlock_irqrestore(&xrusb->write_lock, flags);
+
+ if (stat < 0)
+ return stat;
+
+ return count;
+}
+
+static int xrusb_tty_write_room(struct tty_struct *tty)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ /*
+ * Do not let the line discipline to know that we have a reserve,
+ * or it might get too enthusiastic.
+ */
+ return xrusb_wb_is_avail(xrusb) ? xrusb->writesize : 0;
+}
+
+static int xrusb_tty_chars_in_buffer(struct tty_struct *tty)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ /*
+ * if the device was unplugged then any remaining characters fell out
+ * of the connector ;)
+ */
+ if (xrusb->disconnected)
+ return 0;
+ /*
+ * This is inaccurate (overcounts), but it works.
+ */
+ return (XRUSB_NW - xrusb_wb_is_avail(xrusb)) * xrusb->writesize;
+}
+
+static void xrusb_tty_throttle(struct tty_struct *tty)
+{
+ struct xrusb *xrusb = tty->driver_data;
+
+ spin_lock_irq(&xrusb->read_lock);
+ xrusb->throttle_req = 1;
+ spin_unlock_irq(&xrusb->read_lock);
+}
+
+static void xrusb_tty_unthrottle(struct tty_struct *tty)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ unsigned int was_throttled;
+
+ spin_lock_irq(&xrusb->read_lock);
+ was_throttled = xrusb->throttled;
+ xrusb->throttled = 0;
+ xrusb->throttle_req = 0;
+ spin_unlock_irq(&xrusb->read_lock);
+
+ if (was_throttled)
+ xrusb_submit_read_urbs(xrusb, GFP_KERNEL);
+}
+
+static int xrusb_tty_break_ctl(struct tty_struct *tty, int state)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ int rv;
+
+ rv = xrusb_send_break(xrusb, state ? 0xffff : 0);
+ if (rv < 0) {
+ dev_err(&xrusb->control->dev, "%s - send break failed\n",
+ __func__);
+ }
+ return rv;
+}
+
+static int xrusb_tty_tiocmget(struct tty_struct *tty)
+{
+ struct xrusb *xrusb = tty->driver_data;
+
+ return xrusb_tiocmget(xrusb);
+}
+
+static int xrusb_tty_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ struct xrusb *xrusb = tty->driver_data;
+
+ return xrusb_tiocmset(xrusb, set, clear);
+}
+
+static int get_serial_info(struct xrusb *xrusb,
+ struct serial_struct __user *info)
+{
+ struct serial_struct tmp;
+
+ if (!info)
+ return -EINVAL;
+
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.type = xrusb->uart_type;
+ tmp.flags = ASYNC_LOW_LATENCY;
+ tmp.xmit_fifo_size = xrusb->writesize;
+ tmp.baud_base = le32_to_cpu(xrusb->line.dwDTERate);
+ tmp.close_delay = xrusb->port.close_delay / 10;
+ tmp.closing_wait = xrusb->port.closing_wait ==
+ ASYNC_CLOSING_WAIT_NONE ? ASYNC_CLOSING_WAIT_NONE :
+ xrusb->port.closing_wait / 10;
+
+ if (copy_to_user(info, &tmp, sizeof(tmp)))
+ return -EFAULT;
+ else
+ return 0;
+}
+
+static int set_serial_info(struct xrusb *xrusb,
+ struct serial_struct __user *newinfo)
+{
+ struct serial_struct new_serial;
+ unsigned int closing_wait, close_delay;
+ int rv = 0;
+
+ if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
+ return -EFAULT;
+
+ close_delay = new_serial.close_delay * 10;
+ closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
+ ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
+
+ mutex_lock(&xrusb->port.mutex);
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ if ((close_delay != xrusb->port.close_delay) ||
+ (closing_wait != xrusb->port.closing_wait)) {
+ rv = -EPERM;
+ } else {
+ rv = -EOPNOTSUPP;
+ }
+ } else {
+ xrusb->port.close_delay = close_delay;
+ xrusb->port.closing_wait = closing_wait;
+ }
+ xrusb->uart_type = new_serial.type;
+ mutex_unlock(&xrusb->port.mutex);
+ return rv;
+}
+
+/* Enable or disable the rs485 support */
+void xr_config_rs485(struct xrusb *xrusb, struct serial_rs485 *rs485conf)
+{
+ int rv;
+ short reg_value;
+
+ xrusb->rs485 = *rs485conf;
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_mode, ®_value);
+
+ if (rs485conf->flags & SER_RS485_ENABLED) {
+ if ((rs485conf->delay_rts_after_send) < 0xf) {
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_rs485_delay,
+ rs485conf->delay_rts_after_send);
+ } else {
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_rs485_delay,
+ 0xf); // max value is 0xf
+ }
+
+ if (rs485conf->flags & SER_RS485_RTS_ON_SEND) {
+ /* Set logical level for RTS pin equal to 1 when sending: */
+ reg_value &= 0xfff0;
+ reg_value |= 0xb;
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_gpio_mode,
+ reg_value);
+ } else {
+ /*set logical level for RTS pin equal to 0 when sending: */
+ reg_value &= 0xfff0;
+ reg_value |= 0x3;
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_gpio_mode,
+ reg_value);
+ }
+
+ } else {
+ /* RS-485/422 RTS direction control output disabled */
+ rv = xrusb_set_reg(xrusb,
+ xrusb->reg_map.uart_gpio_mode,
+ reg_value & 0xfff0);
+ }
+
+}
+
+static int xrusb_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
+ unsigned long arg)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ int rv = -ENOIOCTLCMD;
+ struct serial_rs485 rs485conf;
+
+ switch (cmd) {
+ case TIOCGSERIAL: /* gets serial port data */
+ rv = get_serial_info(xrusb,
+ (struct serial_struct __user *) arg);
+ break;
+ case TIOCSSERIAL:
+ rv = set_serial_info(xrusb,
+ (struct serial_struct __user *) arg);
+ break;
+ case TIOCSRS485:
+ if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
+ sizeof(rs485conf))) {
+ return -EFAULT;
+ }
+ xr_config_rs485(xrusb, &rs485conf);
+ rv = 0;
+ break;
+ case TIOCGRS485:
+ if (copy_to_user((struct serial_rs485 *) arg, &(xrusb->rs485),
+ sizeof(rs485conf))) {
+ return -EFAULT;
+ }
+ rv = 0;
+ break;
+ }
+ return rv;
+}
+
+static void xrusb_tty_set_termios(struct tty_struct *tty,
+ struct ktermios *termios_old)
+{
+ struct xrusb *xrusb = tty->driver_data;
+ struct ktermios *termios = &tty->termios;
+ unsigned int cflag = termios->c_cflag;
+ struct usb_cdc_line_coding newline;
+ int newctrl = xrusb->ctrlout;
+
+ xrusb_disable(xrusb);
+ newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
+ newline.bCharFormat = termios->c_cflag & CSTOPB ? 1 : 0;
+ newline.bParityType = termios->c_cflag & PARENB ?
+ (termios->c_cflag & PARODD ? 1 : 2) +
+ (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
+ xrusb->wide_mode = 0;
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:/*using CS5 replace of the 9 bit data mode*/
+ newline.bDataBits = 9;
+ xrusb->wide_mode = 1;
+ break;
+ case CS6:
+ newline.bDataBits = 6;
+ break;
+ case CS7:
+ newline.bDataBits = 7;
+ break;
+ case CS8:
+ default:
+ newline.bDataBits = 8;
+ break;
+ }
+ /* FIXME: Needs to clear unsupported bits in the termios */
+ xrusb->clocal = ((termios->c_cflag & CLOCAL) != 0);
+
+ if (!newline.dwDTERate) {
+ newline.dwDTERate = xrusb->line.dwDTERate;
+ newctrl &= ~XRUSB_CTRL_DTR;
+ } else {
+ newctrl |= XRUSB_CTRL_DTR;
+ }
+
+ if (newctrl != xrusb->ctrlout)
+ xrusb_set_control(xrusb, xrusb->ctrlout = newctrl);
+
+ xrusb_set_flow_mode(xrusb, tty, cflag);
+
+ if (xrusb->wide_mode)
+ xrusb_set_wide_mode(xrusb, 1);
+ else if (!xrusb->wide_mode)
+ xrusb_set_wide_mode(xrusb, 0);
+
+ if (memcmp(&xrusb->line, &newline, sizeof(newline))) {
+ memcpy(&xrusb->line, &newline, sizeof(newline));
+ xrusb_set_line(xrusb, &xrusb->line);
+ }
+ xrusb_enable(xrusb);
+}
+
+static const struct tty_port_operations xrusb_port_ops = {
+ .shutdown = xrusb_port_shutdown,
+ .activate = xrusb_port_activate,
+ .destruct = xrusb_port_destruct,
+};
+
+/*
+ * USB probe and disconnect routines.
+ */
+
+/* Little helpers: write/read buffers free */
+static void xrusb_write_buffers_free(struct xrusb *xrusb)
+{
+ int i;
+ struct xrusb_wb *wb;
+
+ for (wb = &xrusb->wb[0], i = 0; i < XRUSB_NW; i++, wb++)
+ usb_free_coherent(xrusb->dev,
+ xrusb->writesize, wb->buf, wb->dmah);
+}
+
+static void xrusb_read_buffers_free(struct xrusb *xrusb)
+{
+ int i;
+
+ for (i = 0; i < xrusb->rx_buflimit; i++)
+ usb_free_coherent(xrusb->dev, xrusb->readsize,
+ xrusb->read_buffers[i].base,
+ xrusb->read_buffers[i].dma);
+}
+
+/* Little helper: write buffers allocate */
+static int xrusb_write_buffers_alloc(struct xrusb *xrusb)
+{
+ int i;
+ struct xrusb_wb *wb;
+
+ for (wb = &xrusb->wb[0], i = 0; i < XRUSB_NW; i++, wb++) {
+ wb->buf = usb_alloc_coherent(xrusb->dev,
+ xrusb->writesize, GFP_KERNEL,
+ &wb->dmah);
+ if (!wb->buf) {
+ while (i != 0) {
+ --i;
+ --wb;
+ usb_free_coherent(xrusb->dev,
+ xrusb->writesize,
+ wb->buf, wb->dmah);
+ }
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+#ifdef CONFIG_GPIOLIB
+static int xrusb_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct xrusb *xrusb = container_of(chip, struct xrusb, xr_gpio);
+ int rv;
+ short gpio_status;
+
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_status,
+ &gpio_status);
+ if (gpio_status&(1 << offset))
+ return 1;
+ else
+ return 0;
+}
+
+static void xrusb_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
+{
+ struct xrusb *xrusb = container_of(chip, struct xrusb, xr_gpio);
+ int rv, tmp;
+
+ tmp = 1 << offset;
+ if (val)
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_set, tmp);
+ else
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_clr, tmp);
+}
+
+static int xrusb_gpio_dir_input(struct gpio_chip *chip, unsigned int offset)
+{
+ int rv;
+ short dir_value;
+ struct xrusb *xrusb = container_of(chip, struct xrusb, xr_gpio);
+
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_dir, &dir_value);
+ dir_value &= ~(1 << offset);
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_dir, (int)dir_value);
+ return 0;
+}
+
+static int xrusb_gpio_dir_output(struct gpio_chip *chip,
+ unsigned int offset, int val)
+{
+ int rv;
+ short tmp;
+ struct xrusb *xrusb = container_of(chip, struct xrusb, xr_gpio);
+
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_dir, &tmp);
+ tmp |= (1 << offset);
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_dir, (int)tmp);
+
+ if (offset > 7) {
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_mode, &tmp);
+ tmp &= ~(1 << offset);
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_mode,
+ (int)tmp);
+ }
+ return 0;
+}
+#endif
+
+static int xrusb_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct usb_cdc_union_desc *union_header = NULL;
+ unsigned char *buffer = intf->altsetting->extra;
+ int buflen = intf->altsetting->extralen;
+ struct usb_interface *control_interface;
+ struct usb_interface *data_interface;
+ struct usb_endpoint_descriptor *epctrl = NULL;
+ struct usb_endpoint_descriptor *epread = NULL;
+ struct usb_endpoint_descriptor *epwrite = NULL;
+ struct usb_device *usb_dev = interface_to_usbdev(intf);
+ struct xrusb *xrusb;
+ int minor;
+ int ctrlsize, readsize;
+ u8 *buf;
+ u8 ac_management_function = 0;
+ u8 call_management_function = 0;
+ int call_interface_num = -1;
+ int data_interface_num = -1;
+ unsigned long quirks;
+ int num_rx_buf;
+ int i;
+ int combined_interfaces = 0;
+ struct device *tty_dev;
+ int rv = -ENOMEM;
+#ifdef CONFIG_GPIOLIB
+ int gpiochip_base;
+#endif
+
+ /* normal quirks */
+ quirks = (unsigned long)id->driver_info;
+
+ if (quirks == IGNORE_DEVICE)
+ return -ENODEV;
+
+ num_rx_buf = (quirks == SINGLE_RX_URB) ? 1 : XRUSB_NR;
+
+ /* handle quirks deadly to normal probing*/
+ if (quirks == NO_UNION_NORMAL) {
+ data_interface = usb_ifnum_to_if(usb_dev, 1);
+ control_interface = usb_ifnum_to_if(usb_dev, 0);
+ }
+
+ /* normal probing*/
+ if (!buffer) {
+ dev_err(&intf->dev, "Weird descriptor references\n");
+ return -EINVAL;
+ }
+
+ if (!buflen) {
+ if (intf->cur_altsetting->endpoint &&
+ intf->cur_altsetting->endpoint->extralen &&
+ intf->cur_altsetting->endpoint->extra) {
+ dev_dbg(&intf->dev,
+ "Seeking extra descriptors on endpoint\n");
+ buflen = intf->cur_altsetting->endpoint->extralen;
+ buffer = intf->cur_altsetting->endpoint->extra;
+ } else {
+ dev_err(&intf->dev,
+ "Zero length descriptor references\n");
+ return -EINVAL;
+ }
+ }
+
+ while (buflen > 0) {
+ if (buffer[1] != USB_DT_CS_INTERFACE) {
+ dev_err(&intf->dev, "skipping garbage\n");
+ goto next_desc;
+ }
+
+ switch (buffer[2]) {
+ case USB_CDC_UNION_TYPE: /* we've found it */
+ if (union_header) {
+ dev_err(&intf->dev, "> 1 union descriptor");
+ dev_err(&intf->dev, "skipping ...\n");
+ goto next_desc;
+ }
+ union_header = (struct usb_cdc_union_desc *)buffer;
+ break;
+ case USB_CDC_HEADER_TYPE: /* maybe check version */
+ break; /* for now we ignore it */
+ case USB_CDC_ACM_TYPE:
+ ac_management_function = buffer[3];
+ break;
+ case USB_CDC_CALL_MANAGEMENT_TYPE:
+ call_management_function = buffer[3];
+ call_interface_num = buffer[4];
+ //if ((quirks & NOT_A_MODEM) == 0 &&
+ // (call_management_function & 3) != 3)
+ // dev_err(&intf->dev, "This device cannot
+ // do calls on its own. It is
+ // not a modem.\n");
+ break;
+ default:
+ /* there are LOTS more CDC descriptors that
+ * could legitimately be found here.
+ */
+ dev_dbg(&intf->dev, "Ignoring descriptor: ");
+ dev_dbg(&intf->dev, "type %02x, length %d\n",
+ buffer[2], buffer[0]);
+ break;
+ }
+next_desc:
+ buflen -= buffer[0];
+ buffer += buffer[0];
+ }
+
+ control_interface = usb_ifnum_to_if(usb_dev,
+ union_header->bMasterInterface0);
+ data_interface = usb_ifnum_to_if(usb_dev,
+ (data_interface_num = union_header->bSlaveInterface0));
+
+ if (data_interface->cur_altsetting->desc.bNumEndpoints < 2 ||
+ control_interface->cur_altsetting->desc.bNumEndpoints == 0) {
+ return -EINVAL;
+ }
+
+ epctrl = &control_interface->cur_altsetting->endpoint[0].desc;
+ epread = &data_interface->cur_altsetting->endpoint[0].desc;
+ epwrite = &data_interface->cur_altsetting->endpoint[1].desc;
+
+
+ /* workaround for switched endpoints */
+ if (!usb_endpoint_dir_in(epread)) {
+ /* descriptors are swapped */
+ struct usb_endpoint_descriptor *t;
+
+ t = epread;
+ epread = epwrite;
+ epwrite = t;
+ }
+
+ xrusb = kzalloc(sizeof(struct xrusb), GFP_KERNEL);
+ if (xrusb == NULL)
+ goto alloc_fail;
+
+ minor = xrusb_alloc_minor(xrusb);
+ if (minor == XRUSB_TTY_MINORS) {
+ dev_err(&intf->dev, "no more free xrusb devices\n");
+ kfree(xrusb);
+ return -ENODEV;
+ }
+
+ ctrlsize = usb_endpoint_maxp(epctrl);
+ readsize = usb_endpoint_maxp(epread) *
+ (quirks == SINGLE_RX_URB ? 1 : 2);
+ xrusb->combined_interfaces = combined_interfaces;
+ xrusb->writesize = usb_endpoint_maxp(epwrite) * 20;
+ xrusb->control = control_interface;
+ xrusb->data = data_interface;
+ xrusb->minor = minor;
+ xrusb->dev = usb_dev;
+ xrusb->ctrl_caps = ac_management_function;
+ if (quirks & NO_CAP_LINE)
+ xrusb->ctrl_caps &= ~USB_CDC_CAP_LINE;
+ xrusb->ctrlsize = ctrlsize;
+ xrusb->readsize = readsize;
+ xrusb->rx_buflimit = num_rx_buf;
+ INIT_WORK(&xrusb->work, xrusb_softint);
+ spin_lock_init(&xrusb->write_lock);
+ spin_lock_init(&xrusb->read_lock);
+ mutex_init(&xrusb->mutex);
+ xrusb->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
+ xrusb->is_int_ep = usb_endpoint_xfer_int(epread);
+ if (xrusb->is_int_ep)
+ xrusb->bInterval = epread->bInterval;
+ tty_port_init(&xrusb->port);
+ xrusb->port.ops = &xrusb_port_ops;
+ xrusb->DeviceVendor = id->idVendor;
+ xrusb->DeviceProduct = id->idProduct;
+ xrusb->uart_type = 4; /*#define PORT_16550A 4*/
+ xrusb->channel = epwrite->bEndpointAddress;
+
+ buf = usb_alloc_coherent(usb_dev, ctrlsize, GFP_KERNEL,
+ &xrusb->ctrl_dma);
+ if (!buf) {
+ dev_err(&intf->dev, "out of memory (ctrl buffer alloc)\n");
+ goto alloc_fail2;
+ }
+ xrusb->ctrl_buffer = buf;
+
+ if (xrusb_write_buffers_alloc(xrusb) < 0) {
+ dev_err(&intf->dev, "out of memory (write buffer alloc)\n");
+ goto alloc_fail4;
+ }
+
+ xrusb->ctrlurb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!xrusb->ctrlurb) {
+ dev_err(&intf->dev, "out of memory (ctrlurb kmalloc)\n");
+ goto alloc_fail5;
+ }
+ for (i = 0; i < num_rx_buf; i++) {
+ struct xrusb_rb *rb = &(xrusb->read_buffers[i]);
+ struct urb *urb;
+
+ rb->base = usb_alloc_coherent(xrusb->dev, readsize, GFP_KERNEL,
+ &rb->dma);
+ if (!rb->base) {
+ dev_err(&intf->dev, "out of memory ");
+ dev_err(&intf->dev, "(read bufs usb_alloc_coherent)\n");
+ goto alloc_fail6;
+ }
+ rb->index = i;
+ rb->instance = xrusb;
+
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!urb) {
+ dev_err(&intf->dev, "out of memory ");
+ dev_err(&intf->dev, "(read bufs usb_alloc_urb)\n");
+ goto alloc_fail6;
+ }
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+ urb->transfer_dma = rb->dma;
+ if (xrusb->is_int_ep) {
+ usb_fill_int_urb(urb, xrusb->dev,
+ xrusb->rx_endpoint,
+ rb->base,
+ xrusb->readsize,
+ xrusb_read_bulk_callback, rb,
+ xrusb->bInterval);
+ } else {
+ usb_fill_bulk_urb(urb, xrusb->dev,
+ xrusb->rx_endpoint,
+ rb->base,
+ xrusb->readsize,
+ xrusb_read_bulk_callback, rb);
+ }
+
+ xrusb->read_urbs[i] = urb;
+ __set_bit(i, &xrusb->read_urbs_free);
+ }
+ for (i = 0; i < XRUSB_NW; i++) {
+ struct xrusb_wb *snd = &(xrusb->wb[i]);
+
+ snd->urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (snd->urb == NULL) {
+ dev_err(&intf->dev, "out of memory ");
+ dev_err(&intf->dev, "(write urbs usb_alloc_urb)\n");
+ goto alloc_fail7;
+ }
+
+ if (usb_endpoint_xfer_int(epwrite)) {
+ usb_fill_int_urb(snd->urb,
+ usb_dev,
+ usb_sndintpipe(usb_dev,
+ epwrite->bEndpointAddress),
+ NULL,
+ xrusb->writesize,
+ xrusb_write_bulk,
+ snd,
+ epwrite->bInterval);
+ } else {
+ usb_fill_bulk_urb(snd->urb,
+ usb_dev,
+ usb_sndbulkpipe(usb_dev,
+ epwrite->bEndpointAddress),
+ NULL,
+ xrusb->writesize,
+ xrusb_write_bulk,
+ snd);
+ }
+ snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+ snd->instance = xrusb;
+ }
+
+ usb_set_intfdata(intf, xrusb);
+
+ i = device_create_file(&intf->dev, &dev_attr_bmCapabilities);
+ if (i < 0)
+ goto alloc_fail7;
+
+ usb_fill_int_urb(xrusb->ctrlurb, usb_dev,
+ usb_rcvintpipe(usb_dev, epctrl->bEndpointAddress),
+ xrusb->ctrl_buffer, ctrlsize, xrusb_ctrl_irq, xrusb,
+ /* works around buggy devices */
+ epctrl->bInterval ? epctrl->bInterval : 0xff);
+ xrusb->ctrlurb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+ xrusb->ctrlurb->transfer_dma = xrusb->ctrl_dma;
+
+ xrusb_reg_init(xrusb);
+ xrusb_set_control(xrusb, xrusb->ctrlout);
+
+ xrusb->line.dwDTERate = cpu_to_le32(9600);
+ xrusb->line.bDataBits = 8;
+ xrusb_set_line(xrusb, &xrusb->line);
+
+ usb_driver_claim_interface(&xrusb_driver, data_interface, xrusb);
+ usb_set_intfdata(data_interface, xrusb);
+
+ usb_get_intf(control_interface);
+
+ tty_dev = tty_port_register_device(&xrusb->port,
+ xrusb_tty_driver, minor, &control_interface->dev);
+
+ if (IS_ERR(tty_dev)) {
+ rv = PTR_ERR(tty_dev);
+ goto alloc_fail8;
+ }
+#ifdef CONFIG_GPIOLIB
+ /* Setup GPIO cotroller */
+ gpiochip_base = xrusb->dev->portnum*100 + xrusb->channel*10;
+ if (gpiochip_base > 502) {
+ // base must be 502 or less
+ gpiochip_base = 0;
+ }
+
+ xrusb->xr_gpio.owner = THIS_MODULE;
+ xrusb->xr_gpio.label = dev_name(&control_interface->dev);
+ xrusb->xr_gpio.direction_input = xrusb_gpio_dir_input;
+ xrusb->xr_gpio.get = xrusb_gpio_get;
+ xrusb->xr_gpio.direction_output = xrusb_gpio_dir_output;
+ xrusb->xr_gpio.set = xrusb_gpio_set;
+ xrusb->xr_gpio.base = gpiochip_base;
+ xrusb->xr_gpio.ngpio = 10;
+ xrusb->xr_gpio.can_sleep = 1;
+
+ rv = gpiochip_add(&xrusb->xr_gpio);
+
+ if (rv != 0) {
+ // gpiochip numbers not available, start from 0
+ xrusb->xr_gpio.base = 0;
+ }
+
+ while (rv != 0) {
+ xrusb->xr_gpio.base += 10;
+
+ if (xrusb->xr_gpio.base > 502) {
+ // max gpio number = 512
+ // we ran out of gpios??
+ break;
+ }
+ rv = gpiochip_add(&xrusb->xr_gpio);
+ }
+ xrusb->rv_gpio_created = rv;
+ if (rv == 0) {
+ dev_dbg(&xrusb->control->dev, "gpiochip%d added",
+ xrusb->xr_gpio.base);
+ } else {
+ dev_dbg(&xrusb->control->dev, "failed to add gpiochip\n");
+ }
+
+#endif
+
+ return 0;
+
+alloc_fail8:
+ device_remove_file(&xrusb->control->dev, &dev_attr_bmCapabilities);
+alloc_fail7:
+ usb_set_intfdata(intf, NULL);
+ for (i = 0; i < XRUSB_NW; i++)
+ usb_free_urb(xrusb->wb[i].urb);
+alloc_fail6:
+ for (i = 0; i < num_rx_buf; i++)
+ usb_free_urb(xrusb->read_urbs[i]);
+ xrusb_read_buffers_free(xrusb);
+ usb_free_urb(xrusb->ctrlurb);
+alloc_fail5:
+ xrusb_write_buffers_free(xrusb);
+alloc_fail4:
+ usb_free_coherent(usb_dev, ctrlsize,
+ xrusb->ctrl_buffer, xrusb->ctrl_dma);
+alloc_fail2:
+ xrusb_release_minor(xrusb);
+ kfree(xrusb);
+alloc_fail:
+ return rv;
+}
+
+static void stop_data_traffic(struct xrusb *xrusb)
+{
+ int i;
+
+ //dev_dbg(&xrusb->control->dev, "%s\n", __func__);
+
+ usb_kill_urb(xrusb->ctrlurb);
+ for (i = 0; i < XRUSB_NW; i++)
+ usb_kill_urb(xrusb->wb[i].urb);
+ for (i = 0; i < xrusb->rx_buflimit; i++)
+ usb_kill_urb(xrusb->read_urbs[i]);
+
+ cancel_work_sync(&xrusb->work);
+}
+static void xrusb_disconnect(struct usb_interface *intf)
+{
+ struct xrusb *xrusb = usb_get_intfdata(intf);
+ struct tty_struct *tty;
+ /* sibling interface is already cleaning up */
+ if (!xrusb)
+ return;
+
+ mutex_lock(&xrusb->mutex);
+ xrusb->disconnected = true;
+
+ device_remove_file(&xrusb->control->dev,
+ &dev_attr_bmCapabilities);
+ usb_set_intfdata(xrusb->control, NULL);
+ usb_set_intfdata(xrusb->data, NULL);
+ mutex_unlock(&xrusb->mutex);
+
+ tty = tty_port_tty_get(&xrusb->port);
+ if (tty) {
+ tty_vhangup(tty);
+ tty_kref_put(tty);
+ }
+
+ stop_data_traffic(xrusb);
+
+ tty_unregister_device(xrusb_tty_driver, xrusb->minor);
+
+ xrusb_write_buffers_free(xrusb);
+ usb_free_coherent(xrusb->dev, xrusb->ctrlsize,
+ xrusb->ctrl_buffer, xrusb->ctrl_dma);
+ xrusb_read_buffers_free(xrusb);
+
+ if (!xrusb->combined_interfaces) {
+ usb_driver_release_interface(&xrusb_driver,
+ intf == xrusb->control ?
+ xrusb->data : xrusb->control);
+ }
+
+ tty_port_put(&xrusb->port);
+}
+#ifdef CONFIG_PM
+static int xrusb_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct xrusb *xrusb = usb_get_intfdata(intf);
+ int cnt;
+ unsigned short dir_tmp, mode_tmp, state_tmp;
+ int rv;
+
+ if (PMSG_IS_AUTO(message)) {
+ int b;
+
+ spin_lock_irq(&xrusb->write_lock);
+ b = xrusb->transmitting;
+ spin_unlock_irq(&xrusb->write_lock);
+ if (b)
+ return -EBUSY;
+ }
+
+ spin_lock_irq(&xrusb->read_lock);
+ spin_lock(&xrusb->write_lock);
+
+ //Save the register values before suspend
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_dir, &dir_tmp);
+ xrusb->gpio_dir_saved = dir_tmp;
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_status, &state_tmp);
+ xrusb->gpio_state_saved = state_tmp;
+ rv = xrusb_get_reg(xrusb, xrusb->reg_map.uart_gpio_mode, &mode_tmp);
+ xrusb->gpio_mode_saved = mode_tmp;
+ cnt = xrusb->susp_count++;
+ spin_unlock(&xrusb->write_lock);
+ spin_unlock_irq(&xrusb->read_lock);
+
+ if (cnt)
+ return 0;
+
+ if (test_bit(ASYNCB_INITIALIZED, &xrusb->port.flags))
+ stop_data_traffic(xrusb);
+
+ return 0;
+}
+
+static int xrusb_resume(struct usb_interface *intf)
+{
+ struct xrusb *xrusb = usb_get_intfdata(intf);
+ struct xrusb_wb *wb;
+ int rv = 0;
+ int cnt;
+ unsigned short gpio_state, gpio_dir, gpio_mode;
+
+ xrusb_reg_init(xrusb);
+
+ spin_lock_irq(&xrusb->read_lock);
+ xrusb->susp_count -= 1;
+ cnt = xrusb->susp_count;
+ spin_unlock_irq(&xrusb->read_lock);
+
+ if (cnt)
+ return 0;
+
+ if (test_bit(ASYNCB_INITIALIZED, &xrusb->port.flags)) {
+ rv = usb_submit_urb(xrusb->ctrlurb, GFP_NOIO);
+
+ spin_lock_irq(&xrusb->write_lock);
+ if (xrusb->delayed_wb) {
+ wb = xrusb->delayed_wb;
+ xrusb->delayed_wb = NULL;
+ spin_unlock_irq(&xrusb->write_lock);
+ xrusb_start_wb(xrusb, wb);
+ } else {
+ spin_unlock_irq(&xrusb->write_lock);
+ }
+
+ /*
+ * delayed error checking because we must
+ * do the write path at all cost
+ */
+ if (rv < 0)
+ goto err_out;
+
+
+ rv = xrusb_submit_read_urbs(xrusb, GFP_NOIO);
+ }
+ gpio_dir = xrusb->gpio_dir_saved;
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_dir, gpio_dir);
+
+ gpio_mode = xrusb->gpio_mode_saved;
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_mode, gpio_mode);
+
+ gpio_state = xrusb->gpio_state_saved;
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_set, gpio_state);
+ rv = xrusb_set_reg(xrusb, xrusb->reg_map.uart_gpio_clr, ~gpio_state);
+err_out:
+ return rv;
+}
+
+static int xrusb_reset_resume(struct usb_interface *intf)
+{
+ struct xrusb *xrusb = usb_get_intfdata(intf);
+
+ if (test_bit(ASYNCB_INITIALIZED, &xrusb->port.flags))
+ tty_port_tty_hangup(&xrusb->port, false);
+ return xrusb_resume(intf);
+}
+
+#endif /* CONFIG_PM */
+
+/*
+ * USB driver structure.
+ */
+static const struct usb_device_id xrusb_ids[] = {
+ { USB_DEVICE(0x04e2, 0x1410)},
+ { USB_DEVICE(0x04e2, 0x1411)},
+ { USB_DEVICE(0x04e2, 0x1412)},
+ { USB_DEVICE(0x04e2, 0x1414)},
+ { USB_DEVICE(0x04e2, 0x1420)},
+ { USB_DEVICE(0x04e2, 0x1422)},
+ { USB_DEVICE(0x04e2, 0x1424)},
+ { USB_DEVICE(0x04e2, 0x1400)}, // XR2280x ch A
+ { USB_DEVICE(0x04e2, 0x1401)}, // XR2280x ch B
+ { USB_DEVICE(0x04e2, 0x1402)}, // XR2280x ch C
+ { USB_DEVICE(0x04e2, 0x1403)}, // XR2280x ch D
+ { }
+};
+
+MODULE_DEVICE_TABLE(usb, xrusb_ids);
+
+static struct usb_driver xrusb_driver = {
+ .name = "xrusb_serial",
+ .probe = xrusb_probe,
+ .disconnect = xrusb_disconnect,
+#ifdef CONFIG_PM
+ .suspend = xrusb_suspend,
+ .resume = xrusb_resume,
+ .reset_resume = xrusb_reset_resume,
+#endif
+ .id_table = xrusb_ids,
+#ifdef CONFIG_PM
+ .supports_autosuspend = 1,
+#endif
+ .disable_hub_initiated_lpm = 1,
+};
+
+/*
+ * TTY driver structures.
+ */
+
+static const struct tty_operations xrusb_ops = {
+ .install = xrusb_tty_install,
+ .open = xrusb_tty_open,
+ .close = xrusb_tty_close,
+ .cleanup = xrusb_tty_cleanup,
+ .hangup = xrusb_tty_hangup,
+ .write = xrusb_tty_write,
+ .write_room = xrusb_tty_write_room,
+ .ioctl = xrusb_tty_ioctl,
+ .throttle = xrusb_tty_throttle,
+ .unthrottle = xrusb_tty_unthrottle,
+ .chars_in_buffer = xrusb_tty_chars_in_buffer,
+ .break_ctl = xrusb_tty_break_ctl,
+ .set_termios = xrusb_tty_set_termios,
+ .tiocmget = xrusb_tty_tiocmget,
+ .tiocmset = xrusb_tty_tiocmset,
+};
+
+/*
+ * Init / exit.
+ */
+
+static int __init xrusb_init(void)
+{
+ int rv;
+
+ xrusb_tty_driver = alloc_tty_driver(XRUSB_TTY_MINORS);
+ if (!xrusb_tty_driver)
+ return -ENOMEM;
+
+ xrusb_tty_driver->driver_name = "xrusb",
+ xrusb_tty_driver->name = "ttyXRUSB",
+ xrusb_tty_driver->major = XRUSB_TTY_MAJOR,
+ xrusb_tty_driver->minor_start = 0,
+ xrusb_tty_driver->type = TTY_DRIVER_TYPE_SERIAL,
+ xrusb_tty_driver->subtype = SERIAL_TYPE_NORMAL,
+ xrusb_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+ xrusb_tty_driver->init_termios = tty_std_termios;
+ xrusb_tty_driver->init_termios.c_cflag = B9600 | CS8 |
+ CREAD | HUPCL | CLOCAL;
+ tty_set_operations(xrusb_tty_driver, &xrusb_ops);
+
+ rv = tty_register_driver(xrusb_tty_driver);
+ if (rv) {
+ put_tty_driver(xrusb_tty_driver);
+ return rv;
+ }
+
+ rv = usb_register(&xrusb_driver);
+ if (rv) {
+ tty_unregister_driver(xrusb_tty_driver);
+ put_tty_driver(xrusb_tty_driver);
+ return rv;
+ }
+
+ //printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "\n");
+ pr_info(KBUILD_MODNAME ": " DRIVER_DESC "\n");
+
+ return 0;
+}
+
+static void __exit xrusb_exit(void)
+{
+ usb_deregister(&xrusb_driver);
+ tty_unregister_driver(xrusb_tty_driver);
+ put_tty_driver(xrusb_tty_driver);
+}
+
+module_init(xrusb_init);
+module_exit(xrusb_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(XRUSB_TTY_MAJOR);
new file mode 100644
@@ -0,0 +1,234 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Includes for xrusb_serial.c
+ */
+
+/*
+ * CMSPAR, some architectures can't have space and mark parity.
+ */
+
+#ifndef CMSPAR
+#define CMSPAR 0
+#endif
+
+/*
+ * Major and minor numbers.
+ */
+
+#define XRUSB_TTY_MAJOR 266
+#define XRUSB_TTY_MINORS 256
+
+/*
+ * Requests.
+ */
+
+#define USB_RT_XRUSB (USB_TYPE_CLASS | USB_RECIP_INTERFACE)
+
+/*
+ * Output control lines.
+ */
+
+#define XRUSB_CTRL_DTR 0x01
+#define XRUSB_CTRL_RTS 0x02
+
+/*
+ * Input control lines and line errors.
+ */
+
+#define XRUSB_CTRL_DCD 0x01
+#define XRUSB_CTRL_DSR 0x02
+#define XRUSB_CTRL_BRK 0x04
+#define XRUSB_CTRL_RI 0x08
+
+#define XRUSB_CTRL_FRAMING 0x10
+#define XRUSB_CTRL_PARITY 0x20
+#define XRUSB_CTRL_OVERRUN 0x40
+
+/*
+ * Internal driver structures.
+ */
+
+/*
+ * The only reason to have several buffers is to accommodate assumptions
+ * in line disciplines. They ask for empty space amount, receive our URB size,
+ * and proceed to issue several 1-character writes, assuming they will fit.
+ * The very first write takes a complete URB. Fortunately, this only happens
+ * when processing onlcr, so we only need 2 buffers. These values must be
+ * powers of 2.
+ */
+
+#define XRUSB_NW 16
+#define XRUSB_NR 16
+
+#define WIDE_MODE_PARITY 0x1
+#define WIDE_MODE_BREAK 0x2
+#define WIDE_MODE_FRAME 0x4
+#define WIDE_MODE_OVERRUN 0x8
+
+struct xrusb_wb {
+ unsigned char *buf;
+ dma_addr_t dmah;
+ int len;
+ int use;
+ struct urb *urb;
+ struct xrusb *instance;
+};
+
+struct xrusb_rb {
+ int size;
+ unsigned char *base;
+ dma_addr_t dma;
+ int index;
+ struct xrusb *instance;
+};
+
+struct reg_addr_map {
+ unsigned int uart_enable;
+ unsigned int uart_format;
+ unsigned int uart_flow;
+ unsigned int uart_xon_char;
+ unsigned int uart_xoff_char;
+ unsigned int uart_tx_break;
+ unsigned int uart_rs485_delay;
+ unsigned int uart_gpio_mode;
+ unsigned int uart_gpio_dir;
+ unsigned int uart_gpio_set;
+ unsigned int uart_gpio_clr;
+ unsigned int uart_gpio_status;
+ unsigned int uart_gpio_int_mask;
+ unsigned int uart_customized_int;
+ unsigned int uart_gpio_open_drain;
+ unsigned int uart_gpio_pull_up_enable;
+ unsigned int uart_gpio_pull_down_enable;
+ unsigned int uart_loopback;
+ unsigned int uart_low_latency;
+ unsigned int uart_custom_driver;
+};
+
+struct xrusb {
+ struct usb_device *dev; /* the corresponding usb device */
+ struct usb_interface *control; /* control interface */
+ struct usb_interface *data; /* data interface */
+ struct tty_port port; /* our tty port data */
+ struct urb *ctrlurb; /* urbs */
+ u8 *ctrl_buffer; /* buffers of urbs */
+ dma_addr_t ctrl_dma; /* dma handles of buffers */
+ struct xrusb_wb wb[XRUSB_NW];
+ unsigned long read_urbs_free;
+ struct urb *read_urbs[XRUSB_NR];
+ struct xrusb_rb read_buffers[XRUSB_NR];
+ struct xrusb_wb *putbuffer;
+ int rx_buflimit;
+ int rx_endpoint;
+ spinlock_t read_lock;
+ int transmitting;
+ spinlock_t write_lock;
+ struct mutex mutex;
+ bool disconnected;
+ struct usb_cdc_line_coding line; /* bits, stop, parity */
+ struct work_struct work; /* work queue entry for line discipline waking up */
+ unsigned int ctrlin; /* input control lines (DCD, DSR, RI, break, overruns) */
+ unsigned int ctrlout; /* output control lines (DTR, RTS) */
+ unsigned int writesize; /* max packet size for the output bulk endpoint */
+ unsigned int readsize, ctrlsize; /* buffer sizes for freeing */
+ unsigned int minor; /* xrusb minor number */
+ unsigned char clocal; /* termios CLOCAL */
+ unsigned int ctrl_caps; /* control capabilities from the class specific header */
+ unsigned int susp_count; /* number of suspended interfaces */
+ unsigned int combined_interfaces:1; /* control and data collapsed */
+ unsigned int is_int_ep:1; /* interrupt endpoints contrary to spec used */
+ unsigned int throttled:1; /* actually throttled */
+ unsigned int throttle_req:1; /* throttle requested */
+ u8 bInterval;
+
+ struct xrusb_wb *delayed_wb; /* write queued for a device about to be woken */
+ unsigned int channel;
+ int wide_mode; /* USB: wide mode, TTY: flags per character */
+ int have_extra_byte;
+ int extra_byte;
+ int uart_type;
+ unsigned short DeviceVendor;
+ unsigned short DeviceProduct;
+ struct serial_rs485 rs485; /* rs485 settings */
+ int found_smbios_caracalla_config; /* Modes pre-programmed in BIOS for Caracalla board */
+
+ struct reg_addr_map reg_map;
+ #ifdef CONFIG_GPIOLIB
+ struct gpio_chip xr_gpio;
+ int rv_gpio_created;
+ #endif
+ unsigned short gpio_dir_saved;
+ unsigned short gpio_state_saved;
+ unsigned short gpio_mode_saved;
+};
+
+#define CDC_DATA_INTERFACE_TYPE 0x0a
+
+/* constants describing various quirks and errors */
+#define NO_UNION_NORMAL 1
+#define SINGLE_RX_URB 2
+#define NO_CAP_LINE 4
+#define NOT_A_MODEM 8
+#define NO_DATA_INTERFACE 16
+#define IGNORE_DEVICE 32
+
+/* USB Requests */
+#define XRUSB_GET_CHIP_ID 0xFF
+#define XRUSB_SET_XR2280X 5
+#define XRUSB_GET_XR2280X 5
+#define XRUSB_SET_XR21B142X 0
+#define XRUSB_GET_XR21B142X 0
+#define XRUSB_SET_XR21V141X 0
+#define XRUSB_GET_XR21V141X 1
+#define XRUSB_SET_XR21B1411 0
+#define XRUSB_GET_XR21B1411 1
+
+#define XR21V141X_CLOCK_DIVISOR_0 0x004
+#define XR21V141X_CLOCK_DIVISOR_1 0x005
+#define XR21V141X_CLOCK_DIVISOR_2 0x006
+#define XR21V141X_TX_CLOCK_MASK_0 0x007
+#define XR21V141X_TX_CLOCK_MASK_1 0x008
+#define XR21V141X_RX_CLOCK_MASK_0 0x009
+#define XR21V141X_RX_CLOCK_MASK_1 0x00a
+
+/* XR21V141x UART Manager Registers */
+#define XR21V141x_URM_REG_BLOCK 4
+#define XR21V141x_URM_FIFO_ENABLE_REG 0x10
+#define XR21V141x_URM_ENABLE_TX_FIFO 0x1
+#define XR21V141x_URM_ENABLE_RX_FIFO 0x2
+
+#define XR21V141x_URM_RX_FIFO_RESET 0x18
+#define XR21V141x_URM_TX_FIFO_RESET 0x1C
+
+#define XR21V141x_UART_CUSTOM_BLOCK 0x66
+
+#define UART_ENABLE_TX 1
+#define UART_ENABLE_RX 2
+
+#define UART_GPIO_CLR_DTR 0x8
+#define UART_GPIO_SET_DTR 0x8
+#define UART_GPIO_CLR_RTS 0x20
+#define UART_GPIO_SET_RTS 0x20
+
+#define LOOPBACK_ENABLE_TX_RX 1
+#define LOOPBACK_ENABLE_RTS_CTS 2
+#define LOOPBACK_ENABLE_DTR_DSR 4
+
+#define UART_FLOW_MODE_NONE 0x0
+#define UART_FLOW_MODE_HW 0x1
+#define UART_FLOW_MODE_SW 0x2
+
+#define UART_GPIO_MODE_SEL_GPIO 0x0
+#define UART_GPIO_MODE_SEL_RTS_CTS 0x1
+
+#define XR21V141X_WIDE_MODE_REG 3
+
+#define XR21B1411_UART_ENABLE 0xC00
+#define XR21B1411_WIDE_MODE_REG 0xD02
+
+#define XR21B142x_UART_ENABLE 0x00
+#define XR21B142X_TX_WIDE_MODE_REG 0x42
+#define XR21B142X_RX_WIDE_MODE_REG 0x45
+#define XR2280X_TX_WIDE_MODE_REG 0x62
+#define XR2280X_RX_WIDE_MODE_REG 0x65
+#define XR2280x_FUNC_MGR_OFFSET 0x40
The original driver/patch was submitted on April 4, 2018. This is the second version based on the feedback received on the original patch. v2: Removed custom IOCTLs, as suggested by Greg KH Using standard Linux GPIO APIs, as suggested by Greg KH Removed file reads/writes as suggested by Greg KH Signed-off-by: Patong Yang <patong.mxl@gmail.com> --- drivers/usb/serial/xrusb_serial.c | 2380 +++++++++++++++++++++++++++++ drivers/usb/serial/xrusb_serial.h | 234 +++ 2 files changed, 2614 insertions(+) create mode 100644 drivers/usb/serial/xrusb_serial.c create mode 100644 drivers/usb/serial/xrusb_serial.h