diff options
Diffstat (limited to 'drivers/usb/serial/mos7840.c')
| -rw-r--r-- | drivers/usb/serial/mos7840.c | 1775 |
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"); |