diff options
Diffstat (limited to 'drivers/usb/serial/mos7720.c')
| -rw-r--r-- | drivers/usb/serial/mos7720.c | 1763 |
1 files changed, 1763 insertions, 0 deletions
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c new file mode 100644 index 000000000..1d1f85fab --- /dev/null +++ b/drivers/usb/serial/mos7720.c @@ -0,0 +1,1763 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * mos7720.c + * Controls the Moschip 7720 usb to dual port serial converter + * + * Copyright 2006 Moschip Semiconductor Tech. Ltd. + * + * Developed by: + * Vijaya Kumar <vijaykumar.gn@gmail.com> + * Ajay Kumar <naanuajay@yahoo.com> + * Gurudeva <ngurudeva@yahoo.com> + * + * Cleaned up from the original by: + * Greg Kroah-Hartman <gregkh@suse.de> + * + * 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/spinlock.h> +#include <linux/serial.h> +#include <linux/serial_reg.h> +#include <linux/usb.h> +#include <linux/usb/serial.h> +#include <linux/uaccess.h> +#include <linux/parport.h> + +#define DRIVER_AUTHOR "Aspire Communications pvt Ltd." +#define DRIVER_DESC "Moschip USB Serial Driver" + +/* default urb timeout */ +#define MOS_WDR_TIMEOUT 5000 + +#define MOS_MAX_PORT 0x02 +#define MOS_WRITE 0x0E +#define MOS_READ 0x0D + +/* Interrupt Routines Defines */ +#define SERIAL_IIR_RLS 0x06 +#define SERIAL_IIR_RDA 0x04 +#define SERIAL_IIR_CTI 0x0c +#define SERIAL_IIR_THR 0x02 +#define SERIAL_IIR_MS 0x00 + +#define NUM_URBS 16 /* URB Count */ +#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */ + +/* This structure holds all of the local serial port information */ +struct moschip_port { + __u8 shadowLCR; /* last LCR value received */ + __u8 shadowMCR; /* last MCR value received */ + __u8 shadowMSR; /* last MSR value received */ + char open; + struct usb_serial_port *port; /* loop back to the owner */ + struct urb *write_urb_pool[NUM_URBS]; +}; + +#define USB_VENDOR_ID_MOSCHIP 0x9710 +#define MOSCHIP_DEVICE_ID_7720 0x7720 +#define MOSCHIP_DEVICE_ID_7715 0x7715 + +static const struct usb_device_id id_table[] = { + { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7720) }, + { USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7715) }, + { } /* terminating entry */ +}; +MODULE_DEVICE_TABLE(usb, id_table); + +#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT + +/* initial values for parport regs */ +#define DCR_INIT_VAL 0x0c /* SLCTIN, nINIT */ +#define ECR_INIT_VAL 0x00 /* SPP mode */ + +enum mos7715_pp_modes { + SPP = 0<<5, + PS2 = 1<<5, /* moschip calls this 'NIBBLE' mode */ + PPF = 2<<5, /* moschip calls this 'CB-FIFO mode */ +}; + +struct mos7715_parport { + struct parport *pp; /* back to containing struct */ + struct kref ref_count; /* to instance of this struct */ + bool msg_pending; /* usb sync call pending */ + struct completion syncmsg_compl; /* usb sync call completed */ + struct work_struct work; /* restore deferred writes */ + struct usb_serial *serial; /* back to containing struct */ + __u8 shadowECR; /* parallel port regs... */ + __u8 shadowDCR; + atomic_t shadowDSR; /* updated in int-in callback */ +}; + +/* lock guards against dereferencing NULL ptr in parport ops callbacks */ +static DEFINE_SPINLOCK(release_lock); + +#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ + +static const unsigned int dummy; /* for clarity in register access fns */ + +enum mos_regs { + MOS7720_THR, /* serial port regs */ + MOS7720_RHR, + MOS7720_IER, + MOS7720_FCR, + MOS7720_ISR, + MOS7720_LCR, + MOS7720_MCR, + MOS7720_LSR, + MOS7720_MSR, + MOS7720_SPR, + MOS7720_DLL, + MOS7720_DLM, + MOS7720_DPR, /* parallel port regs */ + MOS7720_DSR, + MOS7720_DCR, + MOS7720_ECR, + MOS7720_SP1_REG, /* device control regs */ + MOS7720_SP2_REG, /* serial port 2 (7720 only) */ + MOS7720_PP_REG, + MOS7720_SP_CONTROL_REG, +}; + +/* + * Return the correct value for the Windex field of the setup packet + * for a control endpoint message. See the 7715 datasheet. + */ +static inline __u16 get_reg_index(enum mos_regs reg) +{ + static const __u16 mos7715_index_lookup_table[] = { + 0x00, /* MOS7720_THR */ + 0x00, /* MOS7720_RHR */ + 0x01, /* MOS7720_IER */ + 0x02, /* MOS7720_FCR */ + 0x02, /* MOS7720_ISR */ + 0x03, /* MOS7720_LCR */ + 0x04, /* MOS7720_MCR */ + 0x05, /* MOS7720_LSR */ + 0x06, /* MOS7720_MSR */ + 0x07, /* MOS7720_SPR */ + 0x00, /* MOS7720_DLL */ + 0x01, /* MOS7720_DLM */ + 0x00, /* MOS7720_DPR */ + 0x01, /* MOS7720_DSR */ + 0x02, /* MOS7720_DCR */ + 0x0a, /* MOS7720_ECR */ + 0x01, /* MOS7720_SP1_REG */ + 0x02, /* MOS7720_SP2_REG (7720 only) */ + 0x04, /* MOS7720_PP_REG (7715 only) */ + 0x08, /* MOS7720_SP_CONTROL_REG */ + }; + return mos7715_index_lookup_table[reg]; +} + +/* + * Return the correct value for the upper byte of the Wvalue field of + * the setup packet for a control endpoint message. + */ +static inline __u16 get_reg_value(enum mos_regs reg, + unsigned int serial_portnum) +{ + if (reg >= MOS7720_SP1_REG) /* control reg */ + return 0x0000; + + else if (reg >= MOS7720_DPR) /* parallel port reg (7715 only) */ + return 0x0100; + + else /* serial port reg */ + return (serial_portnum + 2) << 8; +} + +/* + * Write data byte to the specified device register. The data is embedded in + * the value field of the setup packet. serial_portnum is ignored for registers + * not specific to a particular serial port. + */ +static int write_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, + enum mos_regs reg, __u8 data) +{ + struct usb_device *usbdev = serial->dev; + unsigned int pipe = usb_sndctrlpipe(usbdev, 0); + __u8 request = (__u8)0x0e; + __u8 requesttype = (__u8)0x40; + __u16 index = get_reg_index(reg); + __u16 value = get_reg_value(reg, serial_portnum) + data; + int status = usb_control_msg(usbdev, pipe, request, requesttype, value, + index, NULL, 0, MOS_WDR_TIMEOUT); + if (status < 0) + dev_err(&usbdev->dev, + "mos7720: usb_control_msg() failed: %d\n", status); + return status; +} + +/* + * Read data byte from the specified device register. The data returned by the + * device is embedded in the value field of the setup packet. serial_portnum is + * ignored for registers that are not specific to a particular serial port. + */ +static int read_mos_reg(struct usb_serial *serial, unsigned int serial_portnum, + enum mos_regs reg, __u8 *data) +{ + struct usb_device *usbdev = serial->dev; + unsigned int pipe = usb_rcvctrlpipe(usbdev, 0); + __u8 request = (__u8)0x0d; + __u8 requesttype = (__u8)0xc0; + __u16 index = get_reg_index(reg); + __u16 value = get_reg_value(reg, serial_portnum); + u8 *buf; + int status; + + buf = kmalloc(1, GFP_KERNEL); + if (!buf) { + *data = 0; + return -ENOMEM; + } + + status = usb_control_msg(usbdev, pipe, request, requesttype, value, + index, buf, 1, MOS_WDR_TIMEOUT); + if (status == 1) { + *data = *buf; + } else { + dev_err(&usbdev->dev, + "mos7720: usb_control_msg() failed: %d\n", status); + if (status >= 0) + status = -EIO; + *data = 0; + } + + kfree(buf); + + return status; +} + +#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT + +static inline int mos7715_change_mode(struct mos7715_parport *mos_parport, + enum mos7715_pp_modes mode) +{ + mos_parport->shadowECR = mode; + write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, + mos_parport->shadowECR); + return 0; +} + +static void destroy_mos_parport(struct kref *kref) +{ + struct mos7715_parport *mos_parport = + container_of(kref, struct mos7715_parport, ref_count); + + kfree(mos_parport); +} + +/* + * This is the common top part of all parallel port callback operations that + * send synchronous messages to the device. This implements convoluted locking + * that avoids two scenarios: (1) a port operation is called after usbserial + * has called our release function, at which point struct mos7715_parport has + * been destroyed, and (2) the device has been disconnected, but usbserial has + * not called the release function yet because someone has a serial port open. + * The shared release_lock prevents the first, and the mutex and disconnected + * flag maintained by usbserial covers the second. We also use the msg_pending + * flag to ensure that all synchronous usb message calls have completed before + * our release function can return. + */ +static int parport_prologue(struct parport *pp) +{ + struct mos7715_parport *mos_parport; + + spin_lock(&release_lock); + mos_parport = pp->private_data; + if (unlikely(mos_parport == NULL)) { + /* release fn called, port struct destroyed */ + spin_unlock(&release_lock); + return -1; + } + mos_parport->msg_pending = true; /* synch usb call pending */ + reinit_completion(&mos_parport->syncmsg_compl); + spin_unlock(&release_lock); + + /* ensure writes from restore are submitted before new requests */ + if (work_pending(&mos_parport->work)) + flush_work(&mos_parport->work); + + mutex_lock(&mos_parport->serial->disc_mutex); + if (mos_parport->serial->disconnected) { + /* device disconnected */ + mutex_unlock(&mos_parport->serial->disc_mutex); + mos_parport->msg_pending = false; + complete(&mos_parport->syncmsg_compl); + return -1; + } + + return 0; +} + +/* + * This is the common bottom part of all parallel port functions that send + * synchronous messages to the device. + */ +static inline void parport_epilogue(struct parport *pp) +{ + struct mos7715_parport *mos_parport = pp->private_data; + mutex_unlock(&mos_parport->serial->disc_mutex); + mos_parport->msg_pending = false; + complete(&mos_parport->syncmsg_compl); +} + +static void deferred_restore_writes(struct work_struct *work) +{ + struct mos7715_parport *mos_parport; + + mos_parport = container_of(work, struct mos7715_parport, work); + + mutex_lock(&mos_parport->serial->disc_mutex); + + /* if device disconnected, game over */ + if (mos_parport->serial->disconnected) + goto done; + + write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, + mos_parport->shadowDCR); + write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, + mos_parport->shadowECR); +done: + mutex_unlock(&mos_parport->serial->disc_mutex); +} + +static void parport_mos7715_write_data(struct parport *pp, unsigned char d) +{ + struct mos7715_parport *mos_parport = pp->private_data; + + if (parport_prologue(pp) < 0) + return; + mos7715_change_mode(mos_parport, SPP); + write_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, (__u8)d); + parport_epilogue(pp); +} + +static unsigned char parport_mos7715_read_data(struct parport *pp) +{ + struct mos7715_parport *mos_parport = pp->private_data; + unsigned char d; + + if (parport_prologue(pp) < 0) + return 0; + read_mos_reg(mos_parport->serial, dummy, MOS7720_DPR, &d); + parport_epilogue(pp); + return d; +} + +static void parport_mos7715_write_control(struct parport *pp, unsigned char d) +{ + struct mos7715_parport *mos_parport = pp->private_data; + __u8 data; + + if (parport_prologue(pp) < 0) + return; + data = ((__u8)d & 0x0f) | (mos_parport->shadowDCR & 0xf0); + write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, data); + mos_parport->shadowDCR = data; + parport_epilogue(pp); +} + +static unsigned char parport_mos7715_read_control(struct parport *pp) +{ + struct mos7715_parport *mos_parport; + __u8 dcr; + + spin_lock(&release_lock); + mos_parport = pp->private_data; + if (unlikely(mos_parport == NULL)) { + spin_unlock(&release_lock); + return 0; + } + dcr = mos_parport->shadowDCR & 0x0f; + spin_unlock(&release_lock); + return dcr; +} + +static unsigned char parport_mos7715_frob_control(struct parport *pp, + unsigned char mask, + unsigned char val) +{ + struct mos7715_parport *mos_parport = pp->private_data; + __u8 dcr; + + mask &= 0x0f; + val &= 0x0f; + if (parport_prologue(pp) < 0) + return 0; + mos_parport->shadowDCR = (mos_parport->shadowDCR & (~mask)) ^ val; + write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, + mos_parport->shadowDCR); + dcr = mos_parport->shadowDCR & 0x0f; + parport_epilogue(pp); + return dcr; +} + +static unsigned char parport_mos7715_read_status(struct parport *pp) +{ + unsigned char status; + struct mos7715_parport *mos_parport; + + spin_lock(&release_lock); + mos_parport = pp->private_data; + if (unlikely(mos_parport == NULL)) { /* release called */ + spin_unlock(&release_lock); + return 0; + } + status = atomic_read(&mos_parport->shadowDSR) & 0xf8; + spin_unlock(&release_lock); + return status; +} + +static void parport_mos7715_enable_irq(struct parport *pp) +{ +} + +static void parport_mos7715_disable_irq(struct parport *pp) +{ +} + +static void parport_mos7715_data_forward(struct parport *pp) +{ + struct mos7715_parport *mos_parport = pp->private_data; + + if (parport_prologue(pp) < 0) + return; + mos7715_change_mode(mos_parport, PS2); + mos_parport->shadowDCR &= ~0x20; + write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, + mos_parport->shadowDCR); + parport_epilogue(pp); +} + +static void parport_mos7715_data_reverse(struct parport *pp) +{ + struct mos7715_parport *mos_parport = pp->private_data; + + if (parport_prologue(pp) < 0) + return; + mos7715_change_mode(mos_parport, PS2); + mos_parport->shadowDCR |= 0x20; + write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, + mos_parport->shadowDCR); + parport_epilogue(pp); +} + +static void parport_mos7715_init_state(struct pardevice *dev, + struct parport_state *s) +{ + s->u.pc.ctr = DCR_INIT_VAL; + s->u.pc.ecr = ECR_INIT_VAL; +} + +/* N.B. Parport core code requires that this function not block */ +static void parport_mos7715_save_state(struct parport *pp, + struct parport_state *s) +{ + struct mos7715_parport *mos_parport; + + spin_lock(&release_lock); + mos_parport = pp->private_data; + if (unlikely(mos_parport == NULL)) { /* release called */ + spin_unlock(&release_lock); + return; + } + s->u.pc.ctr = mos_parport->shadowDCR; + s->u.pc.ecr = mos_parport->shadowECR; + spin_unlock(&release_lock); +} + +/* N.B. Parport core code requires that this function not block */ +static void parport_mos7715_restore_state(struct parport *pp, + struct parport_state *s) +{ + struct mos7715_parport *mos_parport; + + spin_lock(&release_lock); + mos_parport = pp->private_data; + if (unlikely(mos_parport == NULL)) { /* release called */ + spin_unlock(&release_lock); + return; + } + mos_parport->shadowDCR = s->u.pc.ctr; + mos_parport->shadowECR = s->u.pc.ecr; + + schedule_work(&mos_parport->work); + spin_unlock(&release_lock); +} + +static size_t parport_mos7715_write_compat(struct parport *pp, + const void *buffer, + size_t len, int flags) +{ + int retval; + struct mos7715_parport *mos_parport = pp->private_data; + int actual_len; + + if (parport_prologue(pp) < 0) + return 0; + mos7715_change_mode(mos_parport, PPF); + retval = usb_bulk_msg(mos_parport->serial->dev, + usb_sndbulkpipe(mos_parport->serial->dev, 2), + (void *)buffer, len, &actual_len, + MOS_WDR_TIMEOUT); + parport_epilogue(pp); + if (retval) { + dev_err(&mos_parport->serial->dev->dev, + "mos7720: usb_bulk_msg() failed: %d\n", retval); + return 0; + } + return actual_len; +} + +static struct parport_operations parport_mos7715_ops = { + .owner = THIS_MODULE, + .write_data = parport_mos7715_write_data, + .read_data = parport_mos7715_read_data, + + .write_control = parport_mos7715_write_control, + .read_control = parport_mos7715_read_control, + .frob_control = parport_mos7715_frob_control, + + .read_status = parport_mos7715_read_status, + + .enable_irq = parport_mos7715_enable_irq, + .disable_irq = parport_mos7715_disable_irq, + + .data_forward = parport_mos7715_data_forward, + .data_reverse = parport_mos7715_data_reverse, + + .init_state = parport_mos7715_init_state, + .save_state = parport_mos7715_save_state, + .restore_state = parport_mos7715_restore_state, + + .compat_write_data = parport_mos7715_write_compat, + + .nibble_read_data = parport_ieee1284_read_nibble, + .byte_read_data = parport_ieee1284_read_byte, +}; + +/* + * Allocate and initialize parallel port control struct, initialize + * the parallel port hardware device, and register with the parport subsystem. + */ +static int mos7715_parport_init(struct usb_serial *serial) +{ + struct mos7715_parport *mos_parport; + + /* allocate and initialize parallel port control struct */ + mos_parport = kzalloc(sizeof(struct mos7715_parport), GFP_KERNEL); + if (!mos_parport) + return -ENOMEM; + + mos_parport->msg_pending = false; + kref_init(&mos_parport->ref_count); + usb_set_serial_data(serial, mos_parport); /* hijack private pointer */ + mos_parport->serial = serial; + INIT_WORK(&mos_parport->work, deferred_restore_writes); + init_completion(&mos_parport->syncmsg_compl); + + /* cycle parallel port reset bit */ + write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x80); + write_mos_reg(mos_parport->serial, dummy, MOS7720_PP_REG, (__u8)0x00); + + /* initialize device registers */ + mos_parport->shadowDCR = DCR_INIT_VAL; + write_mos_reg(mos_parport->serial, dummy, MOS7720_DCR, + mos_parport->shadowDCR); + mos_parport->shadowECR = ECR_INIT_VAL; + write_mos_reg(mos_parport->serial, dummy, MOS7720_ECR, + mos_parport->shadowECR); + + /* register with parport core */ + mos_parport->pp = parport_register_port(0, PARPORT_IRQ_NONE, + PARPORT_DMA_NONE, + &parport_mos7715_ops); + if (mos_parport->pp == NULL) { + dev_err(&serial->interface->dev, + "Could not register parport\n"); + kref_put(&mos_parport->ref_count, destroy_mos_parport); + return -EIO; + } + mos_parport->pp->private_data = mos_parport; + mos_parport->pp->modes = PARPORT_MODE_COMPAT | PARPORT_MODE_PCSPP; + mos_parport->pp->dev = &serial->interface->dev; + parport_announce_port(mos_parport->pp); + + return 0; +} +#endif /* CONFIG_USB_SERIAL_MOS7715_PARPORT */ + +/* + * mos7720_interrupt_callback + * this is the callback function for when we have received data on the + * interrupt endpoint. + */ +static void mos7720_interrupt_callback(struct urb *urb) +{ + int result; + int length; + int status = urb->status; + struct device *dev = &urb->dev->dev; + __u8 *data; + __u8 sp1; + __u8 sp2; + + switch (status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + /* this urb is terminated, clean up */ + dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); + return; + default: + dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); + goto exit; + } + + length = urb->actual_length; + data = urb->transfer_buffer; + + /* Moschip get 4 bytes + * Byte 1 IIR Port 1 (port.number is 0) + * Byte 2 IIR Port 2 (port.number is 1) + * Byte 3 -------------- + * Byte 4 FIFO status for both */ + + /* the above description is inverted + * oneukum 2007-03-14 */ + + if (unlikely(length != 4)) { + dev_dbg(dev, "Wrong data !!!\n"); + return; + } + + sp1 = data[3]; + sp2 = data[2]; + + if ((sp1 | sp2) & 0x01) { + /* No Interrupt Pending in both the ports */ + dev_dbg(dev, "No Interrupt !!!\n"); + } else { + switch (sp1 & 0x0f) { + case SERIAL_IIR_RLS: + dev_dbg(dev, "Serial Port 1: Receiver status error or address bit detected in 9-bit mode\n"); + break; + case SERIAL_IIR_CTI: + dev_dbg(dev, "Serial Port 1: Receiver time out\n"); + break; + case SERIAL_IIR_MS: + /* dev_dbg(dev, "Serial Port 1: Modem status change\n"); */ + break; + } + + switch (sp2 & 0x0f) { + case SERIAL_IIR_RLS: + dev_dbg(dev, "Serial Port 2: Receiver status error or address bit detected in 9-bit mode\n"); + break; + case SERIAL_IIR_CTI: + dev_dbg(dev, "Serial Port 2: Receiver time out\n"); + break; + case SERIAL_IIR_MS: + /* dev_dbg(dev, "Serial Port 2: Modem status change\n"); */ + break; + } + } + +exit: + result = usb_submit_urb(urb, GFP_ATOMIC); + if (result) + dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); +} + +/* + * mos7715_interrupt_callback + * this is the 7715's callback function for when we have received data on + * the interrupt endpoint. + */ +static void mos7715_interrupt_callback(struct urb *urb) +{ + int result; + int length; + int status = urb->status; + struct device *dev = &urb->dev->dev; + __u8 *data; + __u8 iir; + + switch (status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + case -ENODEV: + /* this urb is terminated, clean up */ + dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status); + return; + default: + dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status); + goto exit; + } + + length = urb->actual_length; + data = urb->transfer_buffer; + + /* Structure of data from 7715 device: + * Byte 1: IIR serial Port + * Byte 2: unused + * Byte 2: DSR parallel port + * Byte 4: FIFO status for both */ + + if (unlikely(length != 4)) { + dev_dbg(dev, "Wrong data !!!\n"); + return; + } + + iir = data[0]; + if (!(iir & 0x01)) { /* serial port interrupt pending */ + switch (iir & 0x0f) { + case SERIAL_IIR_RLS: + dev_dbg(dev, "Serial Port: Receiver status error or address bit detected in 9-bit mode\n"); + break; + case SERIAL_IIR_CTI: + dev_dbg(dev, "Serial Port: Receiver time out\n"); + break; + case SERIAL_IIR_MS: + /* dev_dbg(dev, "Serial Port: Modem status change\n"); */ + break; + } + } + +#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT + { /* update local copy of DSR reg */ + struct usb_serial_port *port = urb->context; + struct mos7715_parport *mos_parport = port->serial->private; + if (unlikely(mos_parport == NULL)) + return; + atomic_set(&mos_parport->shadowDSR, data[2]); + } +#endif + +exit: + result = usb_submit_urb(urb, GFP_ATOMIC); + if (result) + dev_err(dev, "%s - Error %d submitting control urb\n", __func__, result); +} + +/* + * mos7720_bulk_in_callback + * this is the callback function for when we have received data on the + * bulk in endpoint. + */ +static void mos7720_bulk_in_callback(struct urb *urb) +{ + int retval; + unsigned char *data ; + struct usb_serial_port *port; + int status = urb->status; + + if (status) { + dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status); + return; + } + + port = urb->context; + + dev_dbg(&port->dev, "Entering...%s\n", __func__); + + data = urb->transfer_buffer; + + if (urb->actual_length) { + tty_insert_flip_string(&port->port, data, urb->actual_length); + tty_flip_buffer_push(&port->port); + } + + if (port->read_urb->status != -EINPROGRESS) { + retval = usb_submit_urb(port->read_urb, GFP_ATOMIC); + if (retval) + dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval); + } +} + +/* + * mos7720_bulk_out_data_callback + * this is the callback function for when we have finished sending serial + * data on the bulk out endpoint. + */ +static void mos7720_bulk_out_data_callback(struct urb *urb) +{ + struct moschip_port *mos7720_port; + int status = urb->status; + + if (status) { + dev_dbg(&urb->dev->dev, "nonzero write bulk status received:%d\n", status); + return; + } + + mos7720_port = urb->context; + if (!mos7720_port) { + dev_dbg(&urb->dev->dev, "NULL mos7720_port pointer\n"); + return ; + } + + if (mos7720_port->open) + tty_port_tty_wakeup(&mos7720_port->port->port); +} + +static int mos77xx_calc_num_ports(struct usb_serial *serial, + struct usb_serial_endpoints *epds) +{ + u16 product = le16_to_cpu(serial->dev->descriptor.idProduct); + + if (product == MOSCHIP_DEVICE_ID_7715) { + /* + * The 7715 uses the first bulk in/out endpoint pair for the + * parallel port, and the second for the serial port. We swap + * the endpoint descriptors here so that the first and + * only registered port structure uses the serial-port + * endpoints. + */ + swap(epds->bulk_in[0], epds->bulk_in[1]); + swap(epds->bulk_out[0], epds->bulk_out[1]); + + return 1; + } + + return 2; +} + +static int mos7720_open(struct tty_struct *tty, struct usb_serial_port *port) +{ + struct usb_serial *serial; + struct urb *urb; + struct moschip_port *mos7720_port; + int response; + int port_number; + __u8 data; + int allocated_urbs = 0; + int j; + + serial = port->serial; + + mos7720_port = usb_get_serial_port_data(port); + if (mos7720_port == NULL) + return -ENODEV; + + 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); + mos7720_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(mos7720_port->write_urb_pool[j]); + mos7720_port->write_urb_pool[j] = NULL; + continue; + } + allocated_urbs++; + } + + if (!allocated_urbs) + return -ENOMEM; + + /* Initialize MCS7720 -- Write Init values to corresponding Registers + * + * Register Index + * 0 : MOS7720_THR/MOS7720_RHR + * 1 : MOS7720_IER + * 2 : MOS7720_FCR + * 3 : MOS7720_LCR + * 4 : MOS7720_MCR + * 5 : MOS7720_LSR + * 6 : MOS7720_MSR + * 7 : MOS7720_SPR + * + * 0x08 : SP1/2 Control Reg + */ + port_number = port->port_number; + read_mos_reg(serial, port_number, MOS7720_LSR, &data); + + dev_dbg(&port->dev, "SS::%p LSR:%x\n", mos7720_port, data); + + write_mos_reg(serial, dummy, MOS7720_SP1_REG, 0x02); + write_mos_reg(serial, dummy, MOS7720_SP2_REG, 0x02); + + write_mos_reg(serial, port_number, MOS7720_IER, 0x00); + write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); + + write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); + mos7720_port->shadowLCR = 0x03; + write_mos_reg(serial, port_number, MOS7720_LCR, + mos7720_port->shadowLCR); + mos7720_port->shadowMCR = 0x0b; + write_mos_reg(serial, port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + + write_mos_reg(serial, port_number, MOS7720_SP_CONTROL_REG, 0x00); + read_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, &data); + data = data | (port->port_number + 1); + write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, data); + mos7720_port->shadowLCR = 0x83; + write_mos_reg(serial, port_number, MOS7720_LCR, + mos7720_port->shadowLCR); + write_mos_reg(serial, port_number, MOS7720_THR, 0x0c); + write_mos_reg(serial, port_number, MOS7720_IER, 0x00); + mos7720_port->shadowLCR = 0x03; + write_mos_reg(serial, port_number, MOS7720_LCR, + mos7720_port->shadowLCR); + write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); + + response = usb_submit_urb(port->read_urb, GFP_KERNEL); + if (response) + dev_err(&port->dev, "%s - Error %d submitting read urb\n", + __func__, response); + + /* initialize our port settings */ + mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */ + + /* send a open port command */ + mos7720_port->open = 1; + + return 0; +} + +/* + * mos7720_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 mos7720_chars_in_buffer(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct moschip_port *mos7720_port = usb_get_serial_port_data(port); + int i; + unsigned int chars = 0; + + for (i = 0; i < NUM_URBS; ++i) { + if (mos7720_port->write_urb_pool[i] && + mos7720_port->write_urb_pool[i]->status == -EINPROGRESS) + chars += URB_TRANSFER_BUFFER_SIZE; + } + dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars); + return chars; +} + +static void mos7720_close(struct usb_serial_port *port) +{ + struct usb_serial *serial; + struct moschip_port *mos7720_port; + int j; + + serial = port->serial; + + mos7720_port = usb_get_serial_port_data(port); + if (mos7720_port == NULL) + return; + + for (j = 0; j < NUM_URBS; ++j) + usb_kill_urb(mos7720_port->write_urb_pool[j]); + + /* Freeing Write URBs */ + for (j = 0; j < NUM_URBS; ++j) { + if (mos7720_port->write_urb_pool[j]) { + kfree(mos7720_port->write_urb_pool[j]->transfer_buffer); + usb_free_urb(mos7720_port->write_urb_pool[j]); + } + } + + /* While closing port, shutdown all bulk read, write * + * and interrupt read if they exists, otherwise nop */ + usb_kill_urb(port->write_urb); + usb_kill_urb(port->read_urb); + + write_mos_reg(serial, port->port_number, MOS7720_MCR, 0x00); + write_mos_reg(serial, port->port_number, MOS7720_IER, 0x00); + + mos7720_port->open = 0; +} + +static void mos7720_break(struct tty_struct *tty, int break_state) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned char data; + struct usb_serial *serial; + struct moschip_port *mos7720_port; + + serial = port->serial; + + mos7720_port = usb_get_serial_port_data(port); + if (mos7720_port == NULL) + return; + + if (break_state == -1) + data = mos7720_port->shadowLCR | UART_LCR_SBC; + else + data = mos7720_port->shadowLCR & ~UART_LCR_SBC; + + mos7720_port->shadowLCR = data; + write_mos_reg(serial, port->port_number, MOS7720_LCR, + mos7720_port->shadowLCR); +} + +/* + * mos7720_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 mos7720_write_room(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct moschip_port *mos7720_port = usb_get_serial_port_data(port); + unsigned int room = 0; + int i; + + /* FIXME: Locking */ + for (i = 0; i < NUM_URBS; ++i) { + if (mos7720_port->write_urb_pool[i] && + mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) + room += URB_TRANSFER_BUFFER_SIZE; + } + + dev_dbg(&port->dev, "%s - returns %u\n", __func__, room); + return room; +} + +static int mos7720_write(struct tty_struct *tty, struct usb_serial_port *port, + const unsigned char *data, int count) +{ + int status; + int i; + int bytes_sent = 0; + int transfer_size; + + struct moschip_port *mos7720_port; + struct usb_serial *serial; + struct urb *urb; + const unsigned char *current_position = data; + + serial = port->serial; + + mos7720_port = usb_get_serial_port_data(port); + if (mos7720_port == NULL) + return -ENODEV; + + /* try to find a free urb in the list */ + urb = NULL; + + for (i = 0; i < NUM_URBS; ++i) { + if (mos7720_port->write_urb_pool[i] && + mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) { + urb = mos7720_port->write_urb_pool[i]; + dev_dbg(&port->dev, "URB:%d\n", i); + break; + } + } + + 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); + usb_serial_debug_data(&port->dev, __func__, transfer_size, + urb->transfer_buffer); + + /* fill urb with data and submit */ + usb_fill_bulk_urb(urb, serial->dev, + usb_sndbulkpipe(serial->dev, + port->bulk_out_endpointAddress), + urb->transfer_buffer, transfer_size, + mos7720_bulk_out_data_callback, mos7720_port); + + /* send it down the pipe */ + status = usb_submit_urb(urb, GFP_ATOMIC); + if (status) { + 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; + +exit: + return bytes_sent; +} + +static void mos7720_throttle(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct moschip_port *mos7720_port; + int status; + + mos7720_port = usb_get_serial_port_data(port); + + if (mos7720_port == NULL) + return; + + if (!mos7720_port->open) { + dev_dbg(&port->dev, "%s - port not opened\n", __func__); + return; + } + + /* if we are implementing XON/XOFF, send the stop character */ + if (I_IXOFF(tty)) { + unsigned char stop_char = STOP_CHAR(tty); + status = mos7720_write(tty, port, &stop_char, 1); + if (status <= 0) + return; + } + + /* if we are implementing RTS/CTS, toggle that line */ + if (C_CRTSCTS(tty)) { + mos7720_port->shadowMCR &= ~UART_MCR_RTS; + write_mos_reg(port->serial, port->port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + } +} + +static void mos7720_unthrottle(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct moschip_port *mos7720_port = usb_get_serial_port_data(port); + int status; + + if (mos7720_port == NULL) + return; + + if (!mos7720_port->open) { + dev_dbg(&port->dev, "%s - port not opened\n", __func__); + return; + } + + /* if we are implementing XON/XOFF, send the start character */ + if (I_IXOFF(tty)) { + unsigned char start_char = START_CHAR(tty); + status = mos7720_write(tty, port, &start_char, 1); + if (status <= 0) + return; + } + + /* if we are implementing RTS/CTS, toggle that line */ + if (C_CRTSCTS(tty)) { + mos7720_port->shadowMCR |= UART_MCR_RTS; + write_mos_reg(port->serial, port->port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + } +} + +/* FIXME: this function does not work */ +static int set_higher_rates(struct moschip_port *mos7720_port, + unsigned int baud) +{ + struct usb_serial_port *port; + struct usb_serial *serial; + int port_number; + enum mos_regs sp_reg; + if (mos7720_port == NULL) + return -EINVAL; + + port = mos7720_port->port; + serial = port->serial; + + /*********************************************** + * Init Sequence for higher rates + ***********************************************/ + dev_dbg(&port->dev, "Sending Setting Commands ..........\n"); + port_number = port->port_number; + + write_mos_reg(serial, port_number, MOS7720_IER, 0x00); + write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); + write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); + mos7720_port->shadowMCR = 0x0b; + write_mos_reg(serial, port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x00); + + /*********************************************** + * Set for higher rates * + ***********************************************/ + /* writing baud rate verbatum into uart clock field clearly not right */ + if (port_number == 0) + sp_reg = MOS7720_SP1_REG; + else + sp_reg = MOS7720_SP2_REG; + write_mos_reg(serial, dummy, sp_reg, baud * 0x10); + write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, 0x03); + mos7720_port->shadowMCR = 0x2b; + write_mos_reg(serial, port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + + /*********************************************** + * Set DLL/DLM + ***********************************************/ + mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; + write_mos_reg(serial, port_number, MOS7720_LCR, + mos7720_port->shadowLCR); + write_mos_reg(serial, port_number, MOS7720_DLL, 0x01); + write_mos_reg(serial, port_number, MOS7720_DLM, 0x00); + mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; + write_mos_reg(serial, port_number, MOS7720_LCR, + mos7720_port->shadowLCR); + + return 0; +} + +/* baud rate information */ +struct divisor_table_entry { + __u32 baudrate; + __u16 divisor; +}; + +/* Define table of divisors for moschip 7720 hardware * + * These assume a 3.6864MHz crystal, the standard /16, and * + * MCR.7 = 0. */ +static const struct divisor_table_entry divisor_table[] = { + { 50, 2304}, + { 110, 1047}, /* 2094.545455 => 230450 => .0217 % over */ + { 134, 857}, /* 1713.011152 => 230398.5 => .00065% under */ + { 150, 768}, + { 300, 384}, + { 600, 192}, + { 1200, 96}, + { 1800, 64}, + { 2400, 48}, + { 4800, 24}, + { 7200, 16}, + { 9600, 12}, + { 19200, 6}, + { 38400, 3}, + { 57600, 2}, + { 115200, 1}, +}; + +/***************************************************************************** + * calc_baud_rate_divisor + * this function calculates the proper baud rate divisor for the specified + * baud rate. + *****************************************************************************/ +static int calc_baud_rate_divisor(struct usb_serial_port *port, int baudrate, int *divisor) +{ + int i; + __u16 custom; + __u16 round1; + __u16 round; + + + dev_dbg(&port->dev, "%s - %d\n", __func__, baudrate); + + for (i = 0; i < ARRAY_SIZE(divisor_table); i++) { + if (divisor_table[i].baudrate == baudrate) { + *divisor = divisor_table[i].divisor; + return 0; + } + } + + /* After trying for all the standard baud rates * + * Try calculating the divisor for this baud rate */ + if (baudrate > 75 && baudrate < 230400) { + /* get the divisor */ + custom = (__u16)(230400L / baudrate); + + /* Check for round off */ + round1 = (__u16)(2304000L / baudrate); + round = (__u16)(round1 - (custom * 10)); + if (round > 4) + custom++; + *divisor = custom; + + dev_dbg(&port->dev, "Baud %d = %d\n", baudrate, custom); + return 0; + } + + dev_dbg(&port->dev, "Baud calculation Failed...\n"); + return -EINVAL; +} + +/* + * send_cmd_write_baud_rate + * this function sends the proper command to change the baud rate of the + * specified port. + */ +static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port, + int baudrate) +{ + struct usb_serial_port *port; + struct usb_serial *serial; + int divisor; + int status; + unsigned char number; + + if (mos7720_port == NULL) + return -1; + + port = mos7720_port->port; + serial = port->serial; + + number = port->port_number; + dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudrate); + + /* Calculate the Divisor */ + status = calc_baud_rate_divisor(port, baudrate, &divisor); + if (status) { + dev_err(&port->dev, "%s - bad baud rate\n", __func__); + return status; + } + + /* Enable access to divisor latch */ + mos7720_port->shadowLCR = mos7720_port->shadowLCR | UART_LCR_DLAB; + write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); + + /* Write the divisor */ + write_mos_reg(serial, number, MOS7720_DLL, (__u8)(divisor & 0xff)); + write_mos_reg(serial, number, MOS7720_DLM, + (__u8)((divisor & 0xff00) >> 8)); + + /* Disable access to divisor latch */ + mos7720_port->shadowLCR = mos7720_port->shadowLCR & ~UART_LCR_DLAB; + write_mos_reg(serial, number, MOS7720_LCR, mos7720_port->shadowLCR); + + return status; +} + +/* + * change_port_settings + * This routine is called to set the UART on the device to match + * the specified new settings. + */ +static void change_port_settings(struct tty_struct *tty, + struct moschip_port *mos7720_port, + const struct ktermios *old_termios) +{ + struct usb_serial_port *port; + struct usb_serial *serial; + int baud; + unsigned cflag; + __u8 lData; + __u8 lParity; + __u8 lStop; + int status; + int port_number; + + if (mos7720_port == NULL) + return ; + + port = mos7720_port->port; + serial = port->serial; + port_number = port->port_number; + + if (!mos7720_port->open) { + dev_dbg(&port->dev, "%s - port not opened\n", __func__); + return; + } + + lStop = 0x00; /* 1 stop bit */ + lParity = 0x00; /* No parity */ + + cflag = tty->termios.c_cflag; + + lData = UART_LCR_WLEN(tty_get_char_size(cflag)); + + /* Change the Parity bit */ + if (cflag & PARENB) { + if (cflag & PARODD) { + lParity = UART_LCR_PARITY; + dev_dbg(&port->dev, "%s - parity = odd\n", __func__); + } else { + lParity = (UART_LCR_EPAR | UART_LCR_PARITY); + 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 = UART_LCR_STOP; + dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__); + } else { + lStop = 0x00; + dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__); + } + +#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */ +#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */ +#define LCR_PAR_MASK 0x38 /* Mask for parity field */ + + /* Update the LCR with the correct value */ + mos7720_port->shadowLCR &= + ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK); + mos7720_port->shadowLCR |= (lData | lParity | lStop); + + + /* Disable Interrupts */ + write_mos_reg(serial, port_number, MOS7720_IER, 0x00); + write_mos_reg(serial, port_number, MOS7720_FCR, 0x00); + write_mos_reg(serial, port_number, MOS7720_FCR, 0xcf); + + /* Send the updated LCR value to the mos7720 */ + write_mos_reg(serial, port_number, MOS7720_LCR, + mos7720_port->shadowLCR); + mos7720_port->shadowMCR = 0x0b; + write_mos_reg(serial, port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + + /* set up the MCR register and send it to the mos7720 */ + mos7720_port->shadowMCR = UART_MCR_OUT2; + if (cflag & CBAUD) + mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS); + + if (cflag & CRTSCTS) { + mos7720_port->shadowMCR |= (UART_MCR_XONANY); + /* To set hardware flow control to the specified * + * serial port, in SP1/2_CONTROL_REG */ + if (port_number) + write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, + 0x01); + else + write_mos_reg(serial, dummy, MOS7720_SP_CONTROL_REG, + 0x02); + + } else + mos7720_port->shadowMCR &= ~(UART_MCR_XONANY); + + write_mos_reg(serial, port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + + /* Determine divisor based on baud rate */ + baud = tty_get_baud_rate(tty); + if (!baud) { + /* pick a default, any default... */ + dev_dbg(&port->dev, "Picked default baud...\n"); + baud = 9600; + } + + if (baud >= 230400) { + set_higher_rates(mos7720_port, baud); + /* Enable Interrupts */ + write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); + return; + } + + dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud); + status = send_cmd_write_baud_rate(mos7720_port, baud); + /* FIXME: needs to write actual resulting baud back not just + blindly do so */ + if (cflag & CBAUD) + tty_encode_baud_rate(tty, baud, baud); + /* Enable Interrupts */ + write_mos_reg(serial, port_number, MOS7720_IER, 0x0c); + + if (port->read_urb->status != -EINPROGRESS) { + status = usb_submit_urb(port->read_urb, GFP_KERNEL); + if (status) + dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); + } +} + +/* + * mos7720_set_termios + * this function is called by the tty driver when it wants to change the + * termios structure. + */ +static void mos7720_set_termios(struct tty_struct *tty, + struct usb_serial_port *port, + const struct ktermios *old_termios) +{ + int status; + struct moschip_port *mos7720_port; + + mos7720_port = usb_get_serial_port_data(port); + + if (mos7720_port == NULL) + return; + + if (!mos7720_port->open) { + dev_dbg(&port->dev, "%s - port not opened\n", __func__); + return; + } + + /* change the port settings to the new ones specified */ + change_port_settings(tty, mos7720_port, old_termios); + + if (port->read_urb->status != -EINPROGRESS) { + status = usb_submit_urb(port->read_urb, GFP_KERNEL); + if (status) + dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n", status); + } +} + +/* + * 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 get_lsr_info(struct tty_struct *tty, + struct moschip_port *mos7720_port, unsigned int __user *value) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned int result = 0; + unsigned char data = 0; + int port_number = port->port_number; + int count; + + count = mos7720_chars_in_buffer(tty); + if (count == 0) { + read_mos_reg(port->serial, port_number, MOS7720_LSR, &data); + if ((data & (UART_LSR_TEMT | UART_LSR_THRE)) + == (UART_LSR_TEMT | UART_LSR_THRE)) { + dev_dbg(&port->dev, "%s -- Empty\n", __func__); + result = TIOCSER_TEMT; + } + } + if (copy_to_user(value, &result, sizeof(int))) + return -EFAULT; + return 0; +} + +static int mos7720_tiocmget(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + struct moschip_port *mos7720_port = usb_get_serial_port_data(port); + unsigned int result = 0; + unsigned int mcr ; + unsigned int msr ; + + mcr = mos7720_port->shadowMCR; + msr = mos7720_port->shadowMSR; + + result = ((mcr & UART_MCR_DTR) ? TIOCM_DTR : 0) /* 0x002 */ + | ((mcr & UART_MCR_RTS) ? TIOCM_RTS : 0) /* 0x004 */ + | ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0) /* 0x020 */ + | ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) /* 0x040 */ + | ((msr & UART_MSR_RI) ? TIOCM_RI : 0) /* 0x080 */ + | ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */ + + return result; +} + +static int mos7720_tiocmset(struct tty_struct *tty, + unsigned int set, unsigned int clear) +{ + struct usb_serial_port *port = tty->driver_data; + struct moschip_port *mos7720_port = usb_get_serial_port_data(port); + unsigned int mcr ; + + mcr = mos7720_port->shadowMCR; + + if (set & TIOCM_RTS) + mcr |= UART_MCR_RTS; + if (set & TIOCM_DTR) + mcr |= UART_MCR_DTR; + if (set & TIOCM_LOOP) + mcr |= UART_MCR_LOOP; + + if (clear & TIOCM_RTS) + mcr &= ~UART_MCR_RTS; + if (clear & TIOCM_DTR) + mcr &= ~UART_MCR_DTR; + if (clear & TIOCM_LOOP) + mcr &= ~UART_MCR_LOOP; + + mos7720_port->shadowMCR = mcr; + write_mos_reg(port->serial, port->port_number, MOS7720_MCR, + mos7720_port->shadowMCR); + + return 0; +} + +static int mos7720_ioctl(struct tty_struct *tty, + unsigned int cmd, unsigned long arg) +{ + struct usb_serial_port *port = tty->driver_data; + struct moschip_port *mos7720_port; + + mos7720_port = usb_get_serial_port_data(port); + if (mos7720_port == NULL) + return -ENODEV; + + switch (cmd) { + case TIOCSERGETLSR: + dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__); + return get_lsr_info(tty, mos7720_port, + (unsigned int __user *)arg); + } + + return -ENOIOCTLCMD; +} + +static int mos7720_startup(struct usb_serial *serial) +{ + struct usb_device *dev; + char data; + u16 product; + int ret_val; + + product = le16_to_cpu(serial->dev->descriptor.idProduct); + dev = serial->dev; + + if (product == MOSCHIP_DEVICE_ID_7715) { + struct urb *urb = serial->port[0]->interrupt_in_urb; + + urb->complete = mos7715_interrupt_callback; + +#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT + ret_val = mos7715_parport_init(serial); + if (ret_val < 0) + return ret_val; +#endif + } + /* start the interrupt urb */ + ret_val = usb_submit_urb(serial->port[0]->interrupt_in_urb, GFP_KERNEL); + if (ret_val) { + dev_err(&dev->dev, "failed to submit interrupt urb: %d\n", + ret_val); + } + + /* LSR For Port 1 */ + read_mos_reg(serial, 0, MOS7720_LSR, &data); + dev_dbg(&dev->dev, "LSR:%x\n", data); + + return 0; +} + +static void mos7720_release(struct usb_serial *serial) +{ + usb_kill_urb(serial->port[0]->interrupt_in_urb); + +#ifdef CONFIG_USB_SERIAL_MOS7715_PARPORT + /* close the parallel port */ + + if (le16_to_cpu(serial->dev->descriptor.idProduct) + == MOSCHIP_DEVICE_ID_7715) { + struct mos7715_parport *mos_parport = + usb_get_serial_data(serial); + + /* prevent NULL ptr dereference in port callbacks */ + spin_lock(&release_lock); + mos_parport->pp->private_data = NULL; + spin_unlock(&release_lock); + + /* wait for synchronous usb calls to return */ + if (mos_parport->msg_pending) + wait_for_completion_timeout(&mos_parport->syncmsg_compl, + msecs_to_jiffies(MOS_WDR_TIMEOUT)); + /* + * If delayed work is currently scheduled, wait for it to + * complete. This also implies barriers that ensure the + * below serial clearing is not hoisted above the ->work. + */ + cancel_work_sync(&mos_parport->work); + + parport_remove_port(mos_parport->pp); + usb_set_serial_data(serial, NULL); + mos_parport->serial = NULL; + + parport_del_port(mos_parport->pp); + + kref_put(&mos_parport->ref_count, destroy_mos_parport); + } +#endif +} + +static int mos7720_port_probe(struct usb_serial_port *port) +{ + struct moschip_port *mos7720_port; + + mos7720_port = kzalloc(sizeof(*mos7720_port), GFP_KERNEL); + if (!mos7720_port) + return -ENOMEM; + + mos7720_port->port = port; + + usb_set_serial_port_data(port, mos7720_port); + + return 0; +} + +static void mos7720_port_remove(struct usb_serial_port *port) +{ + struct moschip_port *mos7720_port; + + mos7720_port = usb_get_serial_port_data(port); + kfree(mos7720_port); +} + +static struct usb_serial_driver moschip7720_2port_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "moschip7720", + }, + .description = "Moschip 2 port adapter", + .id_table = id_table, + .num_bulk_in = 2, + .num_bulk_out = 2, + .num_interrupt_in = 1, + .calc_num_ports = mos77xx_calc_num_ports, + .open = mos7720_open, + .close = mos7720_close, + .throttle = mos7720_throttle, + .unthrottle = mos7720_unthrottle, + .attach = mos7720_startup, + .release = mos7720_release, + .port_probe = mos7720_port_probe, + .port_remove = mos7720_port_remove, + .ioctl = mos7720_ioctl, + .tiocmget = mos7720_tiocmget, + .tiocmset = mos7720_tiocmset, + .set_termios = mos7720_set_termios, + .write = mos7720_write, + .write_room = mos7720_write_room, + .chars_in_buffer = mos7720_chars_in_buffer, + .break_ctl = mos7720_break, + .read_bulk_callback = mos7720_bulk_in_callback, + .read_int_callback = mos7720_interrupt_callback, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &moschip7720_2port_driver, NULL +}; + +module_usb_serial_driver(serial_drivers, id_table); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL v2"); |