summaryrefslogtreecommitdiffstats
path: root/drivers/usb/serial/mos7840.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/serial/mos7840.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--drivers/usb/serial/mos7840.c1775
1 files changed, 1775 insertions, 0 deletions
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
new file mode 100644
index 000000000..6b12bb464
--- /dev/null
+++ b/drivers/usb/serial/mos7840.c
@@ -0,0 +1,1775 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Clean ups from Moschip version and a few ioctl implementations by:
+ * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
+ *
+ * Originally based on drivers/usb/serial/io_edgeport.c which is:
+ * Copyright (C) 2000 Inside Out Networks, All rights reserved.
+ * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
+ *
+ */
+
+#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/module.h>
+#include <linux/serial.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/uaccess.h>
+
+#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
+
+/*
+ * 16C50 UART register defines
+ */
+
+#define LCR_BITS_5 0x00 /* 5 bits/char */
+#define LCR_BITS_6 0x01 /* 6 bits/char */
+#define LCR_BITS_7 0x02 /* 7 bits/char */
+#define LCR_BITS_8 0x03 /* 8 bits/char */
+#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
+
+#define LCR_STOP_1 0x00 /* 1 stop bit */
+#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
+#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
+#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
+
+#define LCR_PAR_NONE 0x00 /* No parity */
+#define LCR_PAR_ODD 0x08 /* Odd parity */
+#define LCR_PAR_EVEN 0x18 /* Even parity */
+#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
+#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
+#define LCR_PAR_MASK 0x38 /* Mask for parity field */
+
+#define LCR_SET_BREAK 0x40 /* Set Break condition */
+#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
+
+#define MCR_DTR 0x01 /* Assert DTR */
+#define MCR_RTS 0x02 /* Assert RTS */
+#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
+#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
+#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
+#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
+
+#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
+#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
+#define MOS7840_MSR_RI 0x40 /* Current state of RI */
+#define MOS7840_MSR_CD 0x80 /* Current state of CD */
+
+/*
+ * Defines used for sending commands to port
+ */
+
+#define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
+
+#define MOS_PORT1 0x0200
+#define MOS_PORT2 0x0300
+#define MOS_VENREG 0x0000
+#define MOS_MAX_PORT 0x02
+#define MOS_WRITE 0x0E
+#define MOS_READ 0x0D
+
+/* Requests */
+#define MCS_RD_RTYPE 0xC0
+#define MCS_WR_RTYPE 0x40
+#define MCS_RDREQ 0x0D
+#define MCS_WRREQ 0x0E
+#define MCS_CTRL_TIMEOUT 500
+#define VENDOR_READ_LENGTH (0x01)
+
+#define MAX_NAME_LEN 64
+
+#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
+#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
+
+/* For higher baud Rates use TIOCEXBAUD */
+#define TIOCEXBAUD 0x5462
+
+/*
+ * Vendor id and device id defines
+ *
+ * NOTE: Do not add new defines, add entries directly to the id_table instead.
+ */
+#define USB_VENDOR_ID_BANDB 0x0856
+#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
+#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
+#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
+#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
+#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
+#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
+#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
+#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
+#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
+#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
+#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
+#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
+
+/* Interrupt Routine Defines */
+
+#define SERIAL_IIR_RLS 0x06
+#define SERIAL_IIR_MS 0x00
+
+/*
+ * Emulation of the bit mask on the LINE STATUS REGISTER.
+ */
+#define SERIAL_LSR_DR 0x0001
+#define SERIAL_LSR_OE 0x0002
+#define SERIAL_LSR_PE 0x0004
+#define SERIAL_LSR_FE 0x0008
+#define SERIAL_LSR_BI 0x0010
+
+#define MOS_MSR_DELTA_CTS 0x10
+#define MOS_MSR_DELTA_DSR 0x20
+#define MOS_MSR_DELTA_RI 0x40
+#define MOS_MSR_DELTA_CD 0x80
+
+/* Serial Port register Address */
+#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
+#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
+#define LINE_CONTROL_REGISTER ((__u16)(0x03))
+#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
+#define LINE_STATUS_REGISTER ((__u16)(0x05))
+#define MODEM_STATUS_REGISTER ((__u16)(0x06))
+#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
+#define DIVISOR_LATCH_LSB ((__u16)(0x00))
+#define DIVISOR_LATCH_MSB ((__u16)(0x01))
+
+#define CLK_MULTI_REGISTER ((__u16)(0x02))
+#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
+#define GPIO_REGISTER ((__u16)(0x07))
+
+#define SERIAL_LCR_DLAB ((__u16)(0x0080))
+
+/*
+ * URB POOL related defines
+ */
+#define NUM_URBS 16 /* URB Count */
+#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
+
+/* LED on/off milliseconds*/
+#define LED_ON_MS 500
+#define LED_OFF_MS 500
+
+enum mos7840_flag {
+ MOS7840_FLAG_LED_BUSY,
+};
+
+#define MCS_PORT_MASK GENMASK(2, 0)
+#define MCS_PORTS(nr) ((nr) & MCS_PORT_MASK)
+#define MCS_LED BIT(3)
+
+#define MCS_DEVICE(vid, pid, flags) \
+ USB_DEVICE((vid), (pid)), .driver_info = (flags)
+
+static const struct usb_device_id id_table[] = {
+ { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) }, /* ATEN UC2324 */
+ { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) }, /* ATEN UC2322 */
+ { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) }, /* Moxa UPort 2210 */
+ { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */
+ { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) }, /* MosChip MCS7820 */
+ { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) }, /* MosChip MCS7840 */
+ { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) }, /* ASIX MCS7840 3 port */
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) },
+ { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) },
+ {} /* terminating entry */
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+/* This structure holds all of the local port information */
+
+struct moschip_port {
+ int port_num; /*Actual port number in the device(1,2,etc) */
+ struct urb *read_urb; /* read URB for this port */
+ __u8 shadowLCR; /* last LCR value received */
+ __u8 shadowMCR; /* last MCR value received */
+ struct usb_serial_port *port; /* loop back to the owner of this object */
+
+ /* Offsets */
+ __u8 SpRegOffset;
+ __u8 ControlRegOffset;
+ __u8 DcrRegOffset;
+
+ spinlock_t pool_lock;
+ struct urb *write_urb_pool[NUM_URBS];
+ char busy[NUM_URBS];
+ bool read_urb_busy;
+
+ /* For device(s) with LED indicator */
+ bool has_led;
+ struct timer_list led_timer1; /* Timer for LED on */
+ struct timer_list led_timer2; /* Timer for LED off */
+ struct urb *led_urb;
+ struct usb_ctrlrequest *led_dr;
+
+ unsigned long flags;
+};
+
+/*
+ * mos7840_set_reg_sync
+ * To set the Control register by calling usb_fill_control_urb function
+ * by passing usb_sndctrlpipe function as parameter.
+ */
+
+static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
+ __u16 val)
+{
+ struct usb_device *dev = port->serial->dev;
+ val = val & 0x00ff;
+ dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
+
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
+ MCS_WR_RTYPE, val, reg, NULL, 0,
+ MOS_WDR_TIMEOUT);
+}
+
+/*
+ * mos7840_get_reg_sync
+ * To set the Uart register by calling usb_fill_control_urb function by
+ * passing usb_rcvctrlpipe function as parameter.
+ */
+
+static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
+ __u16 *val)
+{
+ struct usb_device *dev = port->serial->dev;
+ int ret = 0;
+ u8 *buf;
+
+ buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
+ MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
+ MOS_WDR_TIMEOUT);
+ if (ret < VENDOR_READ_LENGTH) {
+ if (ret >= 0)
+ ret = -EIO;
+ goto out;
+ }
+
+ *val = buf[0];
+ dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
+out:
+ kfree(buf);
+ return ret;
+}
+
+/*
+ * mos7840_set_uart_reg
+ * To set the Uart register by calling usb_fill_control_urb function by
+ * passing usb_sndctrlpipe function as parameter.
+ */
+
+static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
+ __u16 val)
+{
+
+ struct usb_device *dev = port->serial->dev;
+ val = val & 0x00ff;
+ /* For the UART control registers, the application number need
+ to be Or'ed */
+ if (port->serial->num_ports == 2 && port->port_number != 0)
+ val |= ((__u16)port->port_number + 2) << 8;
+ else
+ val |= ((__u16)port->port_number + 1) << 8;
+ dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
+ MCS_WR_RTYPE, val, reg, NULL, 0,
+ MOS_WDR_TIMEOUT);
+
+}
+
+/*
+ * mos7840_get_uart_reg
+ * To set the Control register by calling usb_fill_control_urb function
+ * by passing usb_rcvctrlpipe function as parameter.
+ */
+static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
+ __u16 *val)
+{
+ struct usb_device *dev = port->serial->dev;
+ int ret = 0;
+ __u16 Wval;
+ u8 *buf;
+
+ buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ /* Wval is same as application number */
+ if (port->serial->num_ports == 2 && port->port_number != 0)
+ Wval = ((__u16)port->port_number + 2) << 8;
+ else
+ Wval = ((__u16)port->port_number + 1) << 8;
+ dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
+ ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
+ MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
+ MOS_WDR_TIMEOUT);
+ if (ret < VENDOR_READ_LENGTH) {
+ if (ret >= 0)
+ ret = -EIO;
+ goto out;
+ }
+ *val = buf[0];
+out:
+ kfree(buf);
+ return ret;
+}
+
+static void mos7840_dump_serial_port(struct usb_serial_port *port,
+ struct moschip_port *mos7840_port)
+{
+
+ dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
+ dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
+ dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
+
+}
+
+/************************************************************************/
+/************************************************************************/
+/* U S B C A L L B A C K F U N C T I O N S */
+/* U S B C A L L B A C K F U N C T I O N S */
+/************************************************************************/
+/************************************************************************/
+
+static void mos7840_set_led_callback(struct urb *urb)
+{
+ switch (urb->status) {
+ case 0:
+ /* Success */
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ /* This urb is terminated, clean up */
+ dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
+ __func__, urb->status);
+ break;
+ default:
+ dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
+ __func__, urb->status);
+ }
+}
+
+static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
+ __u16 reg)
+{
+ struct usb_device *dev = mcs->port->serial->dev;
+ struct usb_ctrlrequest *dr = mcs->led_dr;
+
+ dr->bRequestType = MCS_WR_RTYPE;
+ dr->bRequest = MCS_WRREQ;
+ dr->wValue = cpu_to_le16(wval);
+ dr->wIndex = cpu_to_le16(reg);
+ dr->wLength = cpu_to_le16(0);
+
+ usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
+ (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
+
+ usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
+}
+
+static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
+ __u16 val)
+{
+ struct usb_device *dev = port->serial->dev;
+
+ usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
+ val, reg, NULL, 0, MOS_WDR_TIMEOUT);
+}
+
+static void mos7840_led_off(struct timer_list *t)
+{
+ struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
+
+ /* Turn off LED */
+ mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
+ mod_timer(&mcs->led_timer2,
+ jiffies + msecs_to_jiffies(LED_OFF_MS));
+}
+
+static void mos7840_led_flag_off(struct timer_list *t)
+{
+ struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
+
+ clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
+}
+
+static void mos7840_led_activity(struct usb_serial_port *port)
+{
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+
+ if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
+ return;
+
+ mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
+ mod_timer(&mos7840_port->led_timer1,
+ jiffies + msecs_to_jiffies(LED_ON_MS));
+}
+
+/*****************************************************************************
+ * mos7840_bulk_in_callback
+ * this is the callback function for when we have received data on the
+ * bulk in endpoint.
+ *****************************************************************************/
+
+static void mos7840_bulk_in_callback(struct urb *urb)
+{
+ struct moschip_port *mos7840_port = urb->context;
+ struct usb_serial_port *port = mos7840_port->port;
+ int retval;
+ unsigned char *data;
+ int status = urb->status;
+
+ if (status) {
+ dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
+ mos7840_port->read_urb_busy = false;
+ return;
+ }
+
+ data = urb->transfer_buffer;
+ usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
+
+ if (urb->actual_length) {
+ struct tty_port *tport = &mos7840_port->port->port;
+ tty_insert_flip_string(tport, data, urb->actual_length);
+ tty_flip_buffer_push(tport);
+ port->icount.rx += urb->actual_length;
+ dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
+ }
+
+ if (mos7840_port->has_led)
+ mos7840_led_activity(port);
+
+ mos7840_port->read_urb_busy = true;
+ retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
+
+ if (retval) {
+ dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
+ mos7840_port->read_urb_busy = false;
+ }
+}
+
+/*****************************************************************************
+ * mos7840_bulk_out_data_callback
+ * this is the callback function for when we have finished sending
+ * serial data on the bulk out endpoint.
+ *****************************************************************************/
+
+static void mos7840_bulk_out_data_callback(struct urb *urb)
+{
+ struct moschip_port *mos7840_port = urb->context;
+ struct usb_serial_port *port = mos7840_port->port;
+ int status = urb->status;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&mos7840_port->pool_lock, flags);
+ for (i = 0; i < NUM_URBS; i++) {
+ if (urb == mos7840_port->write_urb_pool[i]) {
+ mos7840_port->busy[i] = 0;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
+
+ if (status) {
+ dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
+ return;
+ }
+
+ tty_port_tty_wakeup(&port->port);
+
+}
+
+/************************************************************************/
+/* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
+/************************************************************************/
+
+/*****************************************************************************
+ * mos7840_open
+ * this function is called by the tty driver when a port is opened
+ * If successful, we return 0
+ * Otherwise we return a negative error number.
+ *****************************************************************************/
+
+static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
+{
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ struct usb_serial *serial = port->serial;
+ int response;
+ int j;
+ struct urb *urb;
+ __u16 Data;
+ int status;
+
+ usb_clear_halt(serial->dev, port->write_urb->pipe);
+ usb_clear_halt(serial->dev, port->read_urb->pipe);
+
+ /* Initialising the write urb pool */
+ for (j = 0; j < NUM_URBS; ++j) {
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ mos7840_port->write_urb_pool[j] = urb;
+ if (!urb)
+ continue;
+
+ urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
+ GFP_KERNEL);
+ if (!urb->transfer_buffer) {
+ usb_free_urb(urb);
+ mos7840_port->write_urb_pool[j] = NULL;
+ continue;
+ }
+ }
+
+/*****************************************************************************
+ * Initialize MCS7840 -- Write Init values to corresponding Registers
+ *
+ * Register Index
+ * 1 : IER
+ * 2 : FCR
+ * 3 : LCR
+ * 4 : MCR
+ *
+ * 0x08 : SP1/2 Control Reg
+ *****************************************************************************/
+
+ /* NEED to check the following Block */
+
+ Data = 0x0;
+ status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Reading Spreg failed\n");
+ goto err;
+ }
+ Data |= 0x80;
+ status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "writing Spreg failed\n");
+ goto err;
+ }
+
+ Data &= ~0x80;
+ status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "writing Spreg failed\n");
+ goto err;
+ }
+ /* End of block to be checked */
+
+ Data = 0x0;
+ status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
+ &Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Reading Controlreg failed\n");
+ goto err;
+ }
+ Data |= 0x08; /* Driver done bit */
+ Data |= 0x20; /* rx_disable */
+ status = mos7840_set_reg_sync(port,
+ mos7840_port->ControlRegOffset, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "writing Controlreg failed\n");
+ goto err;
+ }
+ /* do register settings here */
+ /* Set all regs to the device default values. */
+ /***********************************
+ * First Disable all interrupts.
+ ***********************************/
+ Data = 0x00;
+ status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "disabling interrupts failed\n");
+ goto err;
+ }
+ /* Set FIFO_CONTROL_REGISTER to the default value */
+ Data = 0x00;
+ status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
+ goto err;
+ }
+
+ Data = 0xcf;
+ status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
+ goto err;
+ }
+
+ Data = 0x03;
+ status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
+ mos7840_port->shadowLCR = Data;
+
+ Data = 0x0b;
+ status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
+ mos7840_port->shadowMCR = Data;
+
+ Data = 0x00;
+ status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
+ mos7840_port->shadowLCR = Data;
+
+ Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
+ status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
+
+ Data = 0x0c;
+ status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
+
+ Data = 0x0;
+ status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
+
+ Data = 0x00;
+ status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
+
+ Data = Data & ~SERIAL_LCR_DLAB;
+ status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
+ mos7840_port->shadowLCR = Data;
+
+ /* clearing Bulkin and Bulkout Fifo */
+ Data = 0x0;
+ status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
+
+ Data = Data | 0x0c;
+ status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
+
+ Data = Data & ~0x0c;
+ status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
+ /* Finally enable all interrupts */
+ Data = 0x0c;
+ status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
+
+ /* clearing rx_disable */
+ Data = 0x0;
+ status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
+ &Data);
+ Data = Data & ~0x20;
+ status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
+ Data);
+
+ /* rx_negate */
+ Data = 0x0;
+ status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
+ &Data);
+ Data = Data | 0x10;
+ status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
+ Data);
+
+ dev_dbg(&port->dev, "port number is %d\n", port->port_number);
+ dev_dbg(&port->dev, "minor number is %d\n", port->minor);
+ dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
+ dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
+ dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
+ dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
+ mos7840_port->read_urb = port->read_urb;
+
+ /* set up our bulk in urb */
+ if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
+ usb_fill_bulk_urb(mos7840_port->read_urb,
+ serial->dev,
+ usb_rcvbulkpipe(serial->dev,
+ (port->bulk_in_endpointAddress) + 2),
+ port->bulk_in_buffer,
+ mos7840_port->read_urb->transfer_buffer_length,
+ mos7840_bulk_in_callback, mos7840_port);
+ } else {
+ usb_fill_bulk_urb(mos7840_port->read_urb,
+ serial->dev,
+ usb_rcvbulkpipe(serial->dev,
+ port->bulk_in_endpointAddress),
+ port->bulk_in_buffer,
+ mos7840_port->read_urb->transfer_buffer_length,
+ mos7840_bulk_in_callback, mos7840_port);
+ }
+
+ dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
+ mos7840_port->read_urb_busy = true;
+ response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
+ if (response) {
+ dev_err(&port->dev, "%s - Error %d submitting control urb\n",
+ __func__, response);
+ mos7840_port->read_urb_busy = false;
+ }
+
+ /* initialize our port settings */
+ /* Must set to enable ints! */
+ mos7840_port->shadowMCR = MCR_MASTER_IE;
+
+ return 0;
+err:
+ for (j = 0; j < NUM_URBS; ++j) {
+ urb = mos7840_port->write_urb_pool[j];
+ if (!urb)
+ continue;
+ kfree(urb->transfer_buffer);
+ usb_free_urb(urb);
+ }
+ return status;
+}
+
+/*****************************************************************************
+ * mos7840_chars_in_buffer
+ * this function is called by the tty driver when it wants to know how many
+ * bytes of data we currently have outstanding in the port (data that has
+ * been written, but hasn't made it out the port yet)
+ *****************************************************************************/
+
+static unsigned int mos7840_chars_in_buffer(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ int i;
+ unsigned int chars = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&mos7840_port->pool_lock, flags);
+ for (i = 0; i < NUM_URBS; ++i) {
+ if (mos7840_port->busy[i]) {
+ struct urb *urb = mos7840_port->write_urb_pool[i];
+ chars += urb->transfer_buffer_length;
+ }
+ }
+ spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
+ dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
+ return chars;
+
+}
+
+/*****************************************************************************
+ * mos7840_close
+ * this function is called by the tty driver when a port is closed
+ *****************************************************************************/
+
+static void mos7840_close(struct usb_serial_port *port)
+{
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ int j;
+ __u16 Data;
+
+ for (j = 0; j < NUM_URBS; ++j)
+ usb_kill_urb(mos7840_port->write_urb_pool[j]);
+
+ /* Freeing Write URBs */
+ for (j = 0; j < NUM_URBS; ++j) {
+ if (mos7840_port->write_urb_pool[j]) {
+ kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
+ usb_free_urb(mos7840_port->write_urb_pool[j]);
+ }
+ }
+
+ usb_kill_urb(mos7840_port->read_urb);
+ mos7840_port->read_urb_busy = false;
+
+ Data = 0x0;
+ mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
+
+ Data = 0x00;
+ mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
+}
+
+/*****************************************************************************
+ * mos7840_break
+ * this function sends a break to the port
+ *****************************************************************************/
+static void mos7840_break(struct tty_struct *tty, int break_state)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ unsigned char data;
+
+ if (break_state == -1)
+ data = mos7840_port->shadowLCR | LCR_SET_BREAK;
+ else
+ data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
+
+ /* FIXME: no locking on shadowLCR anywhere in driver */
+ mos7840_port->shadowLCR = data;
+ dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
+ mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
+ mos7840_port->shadowLCR);
+}
+
+/*****************************************************************************
+ * mos7840_write_room
+ * this function is called by the tty driver when it wants to know how many
+ * bytes of data we can accept for a specific port.
+ *****************************************************************************/
+
+static unsigned int mos7840_write_room(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ int i;
+ unsigned int room = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&mos7840_port->pool_lock, flags);
+ for (i = 0; i < NUM_URBS; ++i) {
+ if (!mos7840_port->busy[i])
+ room += URB_TRANSFER_BUFFER_SIZE;
+ }
+ spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
+
+ room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
+ dev_dbg(&mos7840_port->port->dev, "%s - returns %u\n", __func__, room);
+ return room;
+
+}
+
+/*****************************************************************************
+ * mos7840_write
+ * this function is called by the tty driver when data should be written to
+ * the port.
+ * If successful, we return the number of bytes written, otherwise we
+ * return a negative error number.
+ *****************************************************************************/
+
+static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
+ const unsigned char *data, int count)
+{
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ struct usb_serial *serial = port->serial;
+ int status;
+ int i;
+ int bytes_sent = 0;
+ int transfer_size;
+ unsigned long flags;
+ struct urb *urb;
+ /* __u16 Data; */
+ const unsigned char *current_position = data;
+
+ /* try to find a free urb in the list */
+ urb = NULL;
+
+ spin_lock_irqsave(&mos7840_port->pool_lock, flags);
+ for (i = 0; i < NUM_URBS; ++i) {
+ if (!mos7840_port->busy[i]) {
+ mos7840_port->busy[i] = 1;
+ urb = mos7840_port->write_urb_pool[i];
+ dev_dbg(&port->dev, "URB:%d\n", i);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
+
+ if (urb == NULL) {
+ dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
+ goto exit;
+ }
+
+ if (urb->transfer_buffer == NULL) {
+ urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
+ GFP_ATOMIC);
+ if (!urb->transfer_buffer) {
+ bytes_sent = -ENOMEM;
+ goto exit;
+ }
+ }
+ transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
+
+ memcpy(urb->transfer_buffer, current_position, transfer_size);
+
+ /* fill urb with data and submit */
+ if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
+ usb_fill_bulk_urb(urb,
+ serial->dev,
+ usb_sndbulkpipe(serial->dev,
+ (port->bulk_out_endpointAddress) + 2),
+ urb->transfer_buffer,
+ transfer_size,
+ mos7840_bulk_out_data_callback, mos7840_port);
+ } else {
+ usb_fill_bulk_urb(urb,
+ serial->dev,
+ usb_sndbulkpipe(serial->dev,
+ port->bulk_out_endpointAddress),
+ urb->transfer_buffer,
+ transfer_size,
+ mos7840_bulk_out_data_callback, mos7840_port);
+ }
+
+ dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
+
+ if (mos7840_port->has_led)
+ mos7840_led_activity(port);
+
+ /* send it down the pipe */
+ status = usb_submit_urb(urb, GFP_ATOMIC);
+
+ if (status) {
+ mos7840_port->busy[i] = 0;
+ dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
+ "with status = %d\n", __func__, status);
+ bytes_sent = status;
+ goto exit;
+ }
+ bytes_sent = transfer_size;
+ port->icount.tx += transfer_size;
+ dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
+exit:
+ return bytes_sent;
+
+}
+
+/*****************************************************************************
+ * mos7840_throttle
+ * this function is called by the tty driver when it wants to stop the data
+ * being read from the port.
+ *****************************************************************************/
+
+static void mos7840_throttle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ int status;
+
+ /* if we are implementing XON/XOFF, send the stop character */
+ if (I_IXOFF(tty)) {
+ unsigned char stop_char = STOP_CHAR(tty);
+ status = mos7840_write(tty, port, &stop_char, 1);
+ if (status <= 0)
+ return;
+ }
+ /* if we are implementing RTS/CTS, toggle that line */
+ if (C_CRTSCTS(tty)) {
+ mos7840_port->shadowMCR &= ~MCR_RTS;
+ status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
+ mos7840_port->shadowMCR);
+ if (status < 0)
+ return;
+ }
+}
+
+/*****************************************************************************
+ * mos7840_unthrottle
+ * this function is called by the tty driver when it wants to resume
+ * the data being read from the port (called after mos7840_throttle is
+ * called)
+ *****************************************************************************/
+static void mos7840_unthrottle(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ int status;
+
+ /* if we are implementing XON/XOFF, send the start character */
+ if (I_IXOFF(tty)) {
+ unsigned char start_char = START_CHAR(tty);
+ status = mos7840_write(tty, port, &start_char, 1);
+ if (status <= 0)
+ return;
+ }
+
+ /* if we are implementing RTS/CTS, toggle that line */
+ if (C_CRTSCTS(tty)) {
+ mos7840_port->shadowMCR |= MCR_RTS;
+ status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
+ mos7840_port->shadowMCR);
+ if (status < 0)
+ return;
+ }
+}
+
+static int mos7840_tiocmget(struct tty_struct *tty)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ unsigned int result;
+ __u16 msr;
+ __u16 mcr;
+ int status;
+
+ status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
+ if (status < 0)
+ return -EIO;
+ status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
+ if (status < 0)
+ return -EIO;
+ result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
+ | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
+ | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
+ | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
+ | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
+ | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
+ | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
+
+ dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
+
+ return result;
+}
+
+static int mos7840_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ unsigned int mcr;
+ int status;
+
+ /* FIXME: What locks the port registers ? */
+ mcr = mos7840_port->shadowMCR;
+ if (clear & TIOCM_RTS)
+ mcr &= ~MCR_RTS;
+ if (clear & TIOCM_DTR)
+ mcr &= ~MCR_DTR;
+ if (clear & TIOCM_LOOP)
+ mcr &= ~MCR_LOOPBACK;
+
+ if (set & TIOCM_RTS)
+ mcr |= MCR_RTS;
+ if (set & TIOCM_DTR)
+ mcr |= MCR_DTR;
+ if (set & TIOCM_LOOP)
+ mcr |= MCR_LOOPBACK;
+
+ mos7840_port->shadowMCR = mcr;
+
+ status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
+ if (status < 0) {
+ dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
+ return status;
+ }
+
+ return 0;
+}
+
+/*****************************************************************************
+ * mos7840_calc_baud_rate_divisor
+ * this function calculates the proper baud rate divisor for the specified
+ * baud rate.
+ *****************************************************************************/
+static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
+ int baudRate, int *divisor,
+ __u16 *clk_sel_val)
+{
+ dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
+
+ if (baudRate <= 115200) {
+ *divisor = 115200 / baudRate;
+ *clk_sel_val = 0x0;
+ }
+ if ((baudRate > 115200) && (baudRate <= 230400)) {
+ *divisor = 230400 / baudRate;
+ *clk_sel_val = 0x10;
+ } else if ((baudRate > 230400) && (baudRate <= 403200)) {
+ *divisor = 403200 / baudRate;
+ *clk_sel_val = 0x20;
+ } else if ((baudRate > 403200) && (baudRate <= 460800)) {
+ *divisor = 460800 / baudRate;
+ *clk_sel_val = 0x30;
+ } else if ((baudRate > 460800) && (baudRate <= 806400)) {
+ *divisor = 806400 / baudRate;
+ *clk_sel_val = 0x40;
+ } else if ((baudRate > 806400) && (baudRate <= 921600)) {
+ *divisor = 921600 / baudRate;
+ *clk_sel_val = 0x50;
+ } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
+ *divisor = 1572864 / baudRate;
+ *clk_sel_val = 0x60;
+ } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
+ *divisor = 3145728 / baudRate;
+ *clk_sel_val = 0x70;
+ }
+ return 0;
+}
+
+/*****************************************************************************
+ * mos7840_send_cmd_write_baud_rate
+ * this function sends the proper command to change the baud rate of the
+ * specified port.
+ *****************************************************************************/
+
+static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
+ int baudRate)
+{
+ struct usb_serial_port *port = mos7840_port->port;
+ int divisor = 0;
+ int status;
+ __u16 Data;
+ __u16 clk_sel_val;
+
+ dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
+ /* reset clk_uart_sel in spregOffset */
+ if (baudRate > 115200) {
+#ifdef HW_flow_control
+ /* NOTE: need to see the pther register to modify */
+ /* setting h/w flow control bit to 1 */
+ Data = 0x2b;
+ mos7840_port->shadowMCR = Data;
+ status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
+ Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
+ return -1;
+ }
+#endif
+
+ } else {
+#ifdef HW_flow_control
+ /* setting h/w flow control bit to 0 */
+ Data = 0xb;
+ mos7840_port->shadowMCR = Data;
+ status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
+ Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
+ return -1;
+ }
+#endif
+
+ }
+
+ if (1) { /* baudRate <= 115200) */
+ clk_sel_val = 0x0;
+ Data = 0x0;
+ status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
+ &clk_sel_val);
+ status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
+ &Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
+ return -1;
+ }
+ Data = (Data & 0x8f) | clk_sel_val;
+ status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
+ Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
+ return -1;
+ }
+ /* Calculate the Divisor */
+
+ if (status) {
+ dev_err(&port->dev, "%s - bad baud rate\n", __func__);
+ return status;
+ }
+ /* Enable access to divisor latch */
+ Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
+ mos7840_port->shadowLCR = Data;
+ mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
+
+ /* Write the divisor */
+ Data = (unsigned char)(divisor & 0xff);
+ dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
+ mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
+
+ Data = (unsigned char)((divisor & 0xff00) >> 8);
+ dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
+ mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
+
+ /* Disable access to divisor latch */
+ Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
+ mos7840_port->shadowLCR = Data;
+ mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
+
+ }
+ return status;
+}
+
+/*****************************************************************************
+ * mos7840_change_port_settings
+ * This routine is called to set the UART on the device to match
+ * the specified new settings.
+ *****************************************************************************/
+
+static void mos7840_change_port_settings(struct tty_struct *tty,
+ struct moschip_port *mos7840_port,
+ const struct ktermios *old_termios)
+{
+ struct usb_serial_port *port = mos7840_port->port;
+ int baud;
+ unsigned cflag;
+ __u8 lData;
+ __u8 lParity;
+ __u8 lStop;
+ int status;
+ __u16 Data;
+
+ lData = LCR_BITS_8;
+ lStop = LCR_STOP_1;
+ lParity = LCR_PAR_NONE;
+
+ cflag = tty->termios.c_cflag;
+
+ /* Change the number of bits */
+ switch (cflag & CSIZE) {
+ case CS5:
+ lData = LCR_BITS_5;
+ break;
+
+ case CS6:
+ lData = LCR_BITS_6;
+ break;
+
+ case CS7:
+ lData = LCR_BITS_7;
+ break;
+
+ default:
+ case CS8:
+ lData = LCR_BITS_8;
+ break;
+ }
+
+ /* Change the Parity bit */
+ if (cflag & PARENB) {
+ if (cflag & PARODD) {
+ lParity = LCR_PAR_ODD;
+ dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
+ } else {
+ lParity = LCR_PAR_EVEN;
+ dev_dbg(&port->dev, "%s - parity = even\n", __func__);
+ }
+
+ } else {
+ dev_dbg(&port->dev, "%s - parity = none\n", __func__);
+ }
+
+ if (cflag & CMSPAR)
+ lParity = lParity | 0x20;
+
+ /* Change the Stop bit */
+ if (cflag & CSTOPB) {
+ lStop = LCR_STOP_2;
+ dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
+ } else {
+ lStop = LCR_STOP_1;
+ dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
+ }
+
+ /* Update the LCR with the correct value */
+ mos7840_port->shadowLCR &=
+ ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
+ mos7840_port->shadowLCR |= (lData | lParity | lStop);
+
+ dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
+ mos7840_port->shadowLCR);
+ /* Disable Interrupts */
+ Data = 0x00;
+ mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
+
+ Data = 0x00;
+ mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
+
+ Data = 0xcf;
+ mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
+
+ /* Send the updated LCR value to the mos7840 */
+ Data = mos7840_port->shadowLCR;
+
+ mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
+
+ Data = 0x00b;
+ mos7840_port->shadowMCR = Data;
+ mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
+ Data = 0x00b;
+ mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
+
+ /* set up the MCR register and send it to the mos7840 */
+
+ mos7840_port->shadowMCR = MCR_MASTER_IE;
+ if (cflag & CBAUD)
+ mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
+
+ if (cflag & CRTSCTS)
+ mos7840_port->shadowMCR |= (MCR_XON_ANY);
+ else
+ mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
+
+ Data = mos7840_port->shadowMCR;
+ mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
+
+ /* Determine divisor based on baud rate */
+ baud = tty_get_baud_rate(tty);
+
+ if (!baud) {
+ /* pick a default, any default... */
+ dev_dbg(&port->dev, "%s", "Picked default baud...\n");
+ baud = 9600;
+ }
+
+ dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
+ status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
+
+ /* Enable Interrupts */
+ Data = 0x0c;
+ mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
+
+ if (!mos7840_port->read_urb_busy) {
+ mos7840_port->read_urb_busy = true;
+ status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
+ if (status) {
+ dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
+ status);
+ mos7840_port->read_urb_busy = false;
+ }
+ }
+ dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
+ mos7840_port->shadowLCR);
+}
+
+/*****************************************************************************
+ * mos7840_set_termios
+ * this function is called by the tty driver when it wants to change
+ * the termios structure
+ *****************************************************************************/
+
+static void mos7840_set_termios(struct tty_struct *tty,
+ struct usb_serial_port *port,
+ const struct ktermios *old_termios)
+{
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+ int status;
+
+ /* change the port settings to the new ones specified */
+
+ mos7840_change_port_settings(tty, mos7840_port, old_termios);
+
+ if (!mos7840_port->read_urb_busy) {
+ mos7840_port->read_urb_busy = true;
+ status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
+ if (status) {
+ dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
+ status);
+ mos7840_port->read_urb_busy = false;
+ }
+ }
+}
+
+/*****************************************************************************
+ * mos7840_get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ * is emptied. On bus types like RS485, the transmitter must
+ * release the bus after transmitting. This must be done when
+ * the transmit shift register is empty, not be done when the
+ * transmit holding register is empty. This functionality
+ * allows an RS485 driver to be written in user space.
+ *****************************************************************************/
+
+static int mos7840_get_lsr_info(struct tty_struct *tty,
+ unsigned int __user *value)
+{
+ int count;
+ unsigned int result = 0;
+
+ count = mos7840_chars_in_buffer(tty);
+ if (count == 0)
+ result = TIOCSER_TEMT;
+
+ if (copy_to_user(value, &result, sizeof(int)))
+ return -EFAULT;
+ return 0;
+}
+
+/*****************************************************************************
+ * SerialIoctl
+ * this function handles any ioctl calls to the driver
+ *****************************************************************************/
+
+static int mos7840_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct usb_serial_port *port = tty->driver_data;
+ void __user *argp = (void __user *)arg;
+
+ switch (cmd) {
+ /* return number of bytes available */
+
+ case TIOCSERGETLSR:
+ dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
+ return mos7840_get_lsr_info(tty, argp);
+
+ default:
+ break;
+ }
+ return -ENOIOCTLCMD;
+}
+
+/*
+ * Check if GPO (pin 42) is connected to GPI (pin 33) as recommended by ASIX
+ * for MCS7810 by bit-banging a 16-bit word.
+ *
+ * Note that GPO is really RTS of the third port so this will toggle RTS of
+ * port two or three on two- and four-port devices.
+ */
+static int mos7810_check(struct usb_serial *serial)
+{
+ int i, pass_count = 0;
+ u8 *buf;
+ __u16 data = 0, mcr_data = 0;
+ __u16 test_pattern = 0x55AA;
+ int res;
+
+ buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
+ if (!buf)
+ return 0; /* failed to identify 7810 */
+
+ /* Store MCR setting */
+ res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
+ buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
+ if (res == VENDOR_READ_LENGTH)
+ mcr_data = *buf;
+
+ for (i = 0; i < 16; i++) {
+ /* Send the 1-bit test pattern out to MCS7810 test pin */
+ usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
+ MCS_WRREQ, MCS_WR_RTYPE,
+ (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
+ MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
+
+ /* Read the test pattern back */
+ res = usb_control_msg(serial->dev,
+ usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
+ MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
+ VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
+ if (res == VENDOR_READ_LENGTH)
+ data = *buf;
+
+ /* If this is a MCS7810 device, both test patterns must match */
+ if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
+ break;
+
+ pass_count++;
+ }
+
+ /* Restore MCR setting */
+ usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
+ MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
+ 0, MOS_WDR_TIMEOUT);
+
+ kfree(buf);
+
+ if (pass_count == 16)
+ return 1;
+
+ return 0;
+}
+
+static int mos7840_probe(struct usb_serial *serial,
+ const struct usb_device_id *id)
+{
+ unsigned long device_flags = id->driver_info;
+ u8 *buf;
+
+ /* Skip device-type detection if we already have device flags. */
+ if (device_flags)
+ goto out;
+
+ buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
+ MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
+ VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
+
+ /* For a MCS7840 device GPIO0 must be set to 1 */
+ if (buf[0] & 0x01)
+ device_flags = MCS_PORTS(4);
+ else if (mos7810_check(serial))
+ device_flags = MCS_PORTS(1) | MCS_LED;
+ else
+ device_flags = MCS_PORTS(2);
+
+ kfree(buf);
+out:
+ usb_set_serial_data(serial, (void *)device_flags);
+
+ return 0;
+}
+
+static int mos7840_calc_num_ports(struct usb_serial *serial,
+ struct usb_serial_endpoints *epds)
+{
+ unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
+ int num_ports = MCS_PORTS(device_flags);
+
+ if (num_ports == 0 || num_ports > 4)
+ return -ENODEV;
+
+ if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
+ dev_err(&serial->interface->dev, "missing endpoints\n");
+ return -ENODEV;
+ }
+
+ return num_ports;
+}
+
+static int mos7840_attach(struct usb_serial *serial)
+{
+ struct device *dev = &serial->interface->dev;
+ int status;
+ u16 val;
+
+ /* Zero Length flag enable */
+ val = 0x0f;
+ status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, val);
+ if (status < 0)
+ dev_dbg(dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
+ else
+ dev_dbg(dev, "ZLP_REG5 Writing success status%d\n", status);
+
+ return status;
+}
+
+static int mos7840_port_probe(struct usb_serial_port *port)
+{
+ struct usb_serial *serial = port->serial;
+ unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
+ struct moschip_port *mos7840_port;
+ int status;
+ int pnum;
+ __u16 Data;
+
+ /* we set up the pointers to the endpoints in the mos7840_open *
+ * function, as the structures aren't created yet. */
+
+ pnum = port->port_number;
+
+ dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
+ mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
+ if (!mos7840_port)
+ return -ENOMEM;
+
+ /* Initialize all port interrupt end point to port 0 int
+ * endpoint. Our device has only one interrupt end point
+ * common to all port */
+
+ mos7840_port->port = port;
+ spin_lock_init(&mos7840_port->pool_lock);
+
+ /* minor is not initialised until later by
+ * usb-serial.c:get_free_serial() and cannot therefore be used
+ * to index device instances */
+ mos7840_port->port_num = pnum + 1;
+ dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
+ dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
+
+ if (mos7840_port->port_num == 1) {
+ mos7840_port->SpRegOffset = 0x0;
+ mos7840_port->ControlRegOffset = 0x1;
+ mos7840_port->DcrRegOffset = 0x4;
+ } else {
+ u8 phy_num = mos7840_port->port_num;
+
+ /* Port 2 in the 2-port case uses registers of port 3 */
+ if (serial->num_ports == 2)
+ phy_num = 3;
+
+ mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
+ mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
+ mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
+ }
+ mos7840_dump_serial_port(port, mos7840_port);
+ usb_set_serial_port_data(port, mos7840_port);
+
+ /* enable rx_disable bit in control register */
+ status = mos7840_get_reg_sync(port,
+ mos7840_port->ControlRegOffset, &Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
+ Data |= 0x08; /* setting driver done bit */
+ Data |= 0x04; /* sp1_bit to have cts change reflect in
+ modem status reg */
+
+ /* Data |= 0x20; //rx_disable bit */
+ status = mos7840_set_reg_sync(port,
+ mos7840_port->ControlRegOffset, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
+
+ /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
+ and 0x24 in DCR3 */
+ Data = 0x01;
+ status = mos7840_set_reg_sync(port,
+ (__u16) (mos7840_port->DcrRegOffset + 0), Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
+
+ Data = 0x05;
+ status = mos7840_set_reg_sync(port,
+ (__u16) (mos7840_port->DcrRegOffset + 1), Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
+
+ Data = 0x24;
+ status = mos7840_set_reg_sync(port,
+ (__u16) (mos7840_port->DcrRegOffset + 2), Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
+
+ /* write values in clkstart0x0 and clkmulti 0x20 */
+ Data = 0x0;
+ status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
+
+ Data = 0x20;
+ status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
+
+ /* write value 0x0 to scratchpad register */
+ Data = 0x00;
+ status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
+
+ /* Zero Length flag register */
+ if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
+ Data = 0xff;
+ status = mos7840_set_reg_sync(port,
+ (__u16) (ZLP_REG1 +
+ ((__u16)mos7840_port->port_num)), Data);
+ dev_dbg(&port->dev, "ZLIP offset %x\n",
+ (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
+ } else {
+ Data = 0xff;
+ status = mos7840_set_reg_sync(port,
+ (__u16) (ZLP_REG1 +
+ ((__u16)mos7840_port->port_num) - 0x1), Data);
+ dev_dbg(&port->dev, "ZLIP offset %x\n",
+ (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
+ if (status < 0) {
+ dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
+ goto error;
+ } else
+ dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
+
+ }
+
+ mos7840_port->has_led = device_flags & MCS_LED;
+
+ /* Initialize LED timers */
+ if (mos7840_port->has_led) {
+ mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
+ mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
+ GFP_KERNEL);
+ if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
+ status = -ENOMEM;
+ goto error;
+ }
+
+ timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
+ mos7840_port->led_timer1.expires =
+ jiffies + msecs_to_jiffies(LED_ON_MS);
+ timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
+ 0);
+ mos7840_port->led_timer2.expires =
+ jiffies + msecs_to_jiffies(LED_OFF_MS);
+
+ /* Turn off LED */
+ mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
+ }
+
+ return 0;
+error:
+ kfree(mos7840_port->led_dr);
+ usb_free_urb(mos7840_port->led_urb);
+ kfree(mos7840_port);
+
+ return status;
+}
+
+static void mos7840_port_remove(struct usb_serial_port *port)
+{
+ struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
+
+ if (mos7840_port->has_led) {
+ /* Turn off LED */
+ mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
+
+ del_timer_sync(&mos7840_port->led_timer1);
+ del_timer_sync(&mos7840_port->led_timer2);
+
+ usb_kill_urb(mos7840_port->led_urb);
+ usb_free_urb(mos7840_port->led_urb);
+ kfree(mos7840_port->led_dr);
+ }
+
+ kfree(mos7840_port);
+}
+
+static struct usb_serial_driver moschip7840_4port_device = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "mos7840",
+ },
+ .description = DRIVER_DESC,
+ .id_table = id_table,
+ .num_interrupt_in = 1,
+ .open = mos7840_open,
+ .close = mos7840_close,
+ .write = mos7840_write,
+ .write_room = mos7840_write_room,
+ .chars_in_buffer = mos7840_chars_in_buffer,
+ .throttle = mos7840_throttle,
+ .unthrottle = mos7840_unthrottle,
+ .calc_num_ports = mos7840_calc_num_ports,
+ .probe = mos7840_probe,
+ .attach = mos7840_attach,
+ .ioctl = mos7840_ioctl,
+ .set_termios = mos7840_set_termios,
+ .break_ctl = mos7840_break,
+ .tiocmget = mos7840_tiocmget,
+ .tiocmset = mos7840_tiocmset,
+ .get_icount = usb_serial_generic_get_icount,
+ .port_probe = mos7840_port_probe,
+ .port_remove = mos7840_port_remove,
+ .read_bulk_callback = mos7840_bulk_in_callback,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+ &moschip7840_4port_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");