/*
 * Copyright 2004 Digi International (www.digi.com)
 *      Scott H Kilau <Scott_Kilau at digi dot com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/serial_reg.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>

#include "dgnc_driver.h"
#include "dgnc_mgmt.h"

static ssize_t dgnc_driver_version_show(struct device_driver *ddp, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%s\n", DG_PART);
}
static DRIVER_ATTR(version, S_IRUSR, dgnc_driver_version_show, NULL);

static ssize_t dgnc_driver_boards_show(struct device_driver *ddp, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%d\n", dgnc_NumBoards);
}
static DRIVER_ATTR(boards, S_IRUSR, dgnc_driver_boards_show, NULL);

static ssize_t dgnc_driver_maxboards_show(struct device_driver *ddp, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%d\n", MAXBOARDS);
}
static DRIVER_ATTR(maxboards, S_IRUSR, dgnc_driver_maxboards_show, NULL);

static ssize_t dgnc_driver_pollrate_show(struct device_driver *ddp, char *buf)
{
        return snprintf(buf, PAGE_SIZE, "%dms\n", dgnc_poll_tick);
}

static ssize_t dgnc_driver_pollrate_store(struct device_driver *ddp,
                                          const char *buf, size_t count)
{
        unsigned long flags;
        int tick;
        int ret;

        ret = sscanf(buf, "%d\n", &tick);
        if (ret != 1)
                return -EINVAL;

        spin_lock_irqsave(&dgnc_poll_lock, flags);
        dgnc_poll_tick = tick;
        spin_unlock_irqrestore(&dgnc_poll_lock, flags);

        return count;
}
static DRIVER_ATTR(pollrate, (S_IRUSR | S_IWUSR), dgnc_driver_pollrate_show,
                   dgnc_driver_pollrate_store);

void dgnc_create_driver_sysfiles(struct pci_driver *dgnc_driver)
{
        int rc = 0;
        struct device_driver *driverfs = &dgnc_driver->driver;

        rc |= driver_create_file(driverfs, &driver_attr_version);
        rc |= driver_create_file(driverfs, &driver_attr_boards);
        rc |= driver_create_file(driverfs, &driver_attr_maxboards);
        rc |= driver_create_file(driverfs, &driver_attr_pollrate);
        if (rc)
                pr_err("DGNC: sysfs driver_create_file failed!\n");
}

void dgnc_remove_driver_sysfiles(struct pci_driver *dgnc_driver)
{
        struct device_driver *driverfs = &dgnc_driver->driver;

        driver_remove_file(driverfs, &driver_attr_version);
        driver_remove_file(driverfs, &driver_attr_boards);
        driver_remove_file(driverfs, &driver_attr_maxboards);
        driver_remove_file(driverfs, &driver_attr_pollrate);
}

#define DGNC_VERIFY_BOARD(p, bd)                                \
        do {                                                    \
                if (!p)                                         \
                        return 0;                               \
                                                                \
                bd = dev_get_drvdata(p);                        \
                if (!bd || bd->magic != DGNC_BOARD_MAGIC)       \
                        return 0;                               \
                if (bd->state != BOARD_READY)                   \
                        return 0;                               \
        } while (0)

static ssize_t dgnc_vpd_show(struct device *p, struct device_attribute *attr,
                             char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        count += sprintf(buf + count,
                "\n      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F");
        for (i = 0; i < 0x40 * 2; i++) {
                if (!(i % 16))
                        count += sprintf(buf + count, "\n%04X ", i * 2);
                count += sprintf(buf + count, "%02X ", bd->vpd[i]);
        }
        count += sprintf(buf + count, "\n");

        return count;
}
static DEVICE_ATTR(vpd, S_IRUSR, dgnc_vpd_show, NULL);

static ssize_t dgnc_serial_number_show(struct device *p,
                                       struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;

        DGNC_VERIFY_BOARD(p, bd);

        if (bd->serial_num[0] == '\0')
                count += sprintf(buf + count, "<UNKNOWN>\n");
        else
                count += sprintf(buf + count, "%s\n", bd->serial_num);

        return count;
}
static DEVICE_ATTR(serial_number, S_IRUSR, dgnc_serial_number_show, NULL);

static ssize_t dgnc_ports_state_show(struct device *p,
                                     struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count,
                        "%d %s\n", bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_open_count ? "Open" : "Closed");
        }
        return count;
}
static DEVICE_ATTR(ports_state, S_IRUSR, dgnc_ports_state_show, NULL);

static ssize_t dgnc_ports_baud_show(struct device *p,
                                    struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count +=  snprintf(buf + count, PAGE_SIZE - count,
                        "%d %d\n", bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_old_baud);
        }
        return count;
}
static DEVICE_ATTR(ports_baud, S_IRUSR, dgnc_ports_baud_show, NULL);

static ssize_t dgnc_ports_msignals_show(struct device *p,
                                        struct device_attribute *attr,
                                        char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                if (bd->channels[i]->ch_open_count) {
                        count += snprintf(buf + count, PAGE_SIZE - count,
                                "%d %s %s %s %s %s %s\n",
                                bd->channels[i]->ch_portnum,
                                (bd->channels[i]->ch_mostat & UART_MCR_RTS) ? "RTS" : "",
                                (bd->channels[i]->ch_mistat & UART_MSR_CTS) ? "CTS" : "",
                                (bd->channels[i]->ch_mostat & UART_MCR_DTR) ? "DTR" : "",
                                (bd->channels[i]->ch_mistat & UART_MSR_DSR) ? "DSR" : "",
                                (bd->channels[i]->ch_mistat & UART_MSR_DCD) ? "DCD" : "",
                                (bd->channels[i]->ch_mistat & UART_MSR_RI)  ? "RI"  : "");
                } else {
                        count += snprintf(buf + count, PAGE_SIZE - count,
                                "%d\n", bd->channels[i]->ch_portnum);
                }
        }
        return count;
}
static DEVICE_ATTR(ports_msignals, S_IRUSR, dgnc_ports_msignals_show, NULL);

static ssize_t dgnc_ports_iflag_show(struct device *p,
                                     struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
                        bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_c_iflag);
        }
        return count;
}
static DEVICE_ATTR(ports_iflag, S_IRUSR, dgnc_ports_iflag_show, NULL);

static ssize_t dgnc_ports_cflag_show(struct device *p,
                                     struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
                        bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_c_cflag);
        }
        return count;
}
static DEVICE_ATTR(ports_cflag, S_IRUSR, dgnc_ports_cflag_show, NULL);

static ssize_t dgnc_ports_oflag_show(struct device *p,
                                     struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
                        bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_c_oflag);
        }
        return count;
}
static DEVICE_ATTR(ports_oflag, S_IRUSR, dgnc_ports_oflag_show, NULL);

static ssize_t dgnc_ports_lflag_show(struct device *p,
                                     struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
                        bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_c_lflag);
        }
        return count;
}
static DEVICE_ATTR(ports_lflag, S_IRUSR, dgnc_ports_lflag_show, NULL);

static ssize_t dgnc_ports_digi_flag_show(struct device *p,
                                         struct device_attribute *attr,
                                         char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
                        bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_digi.digi_flags);
        }
        return count;
}
static DEVICE_ATTR(ports_digi_flag, S_IRUSR, dgnc_ports_digi_flag_show, NULL);

static ssize_t dgnc_ports_rxcount_show(struct device *p,
                                       struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count, "%d %ld\n",
                        bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_rxcount);
        }
        return count;
}
static DEVICE_ATTR(ports_rxcount, S_IRUSR, dgnc_ports_rxcount_show, NULL);

static ssize_t dgnc_ports_txcount_show(struct device *p,
                                       struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        int count = 0;
        int i = 0;

        DGNC_VERIFY_BOARD(p, bd);

        for (i = 0; i < bd->nasync; i++) {
                count += snprintf(buf + count, PAGE_SIZE - count, "%d %ld\n",
                        bd->channels[i]->ch_portnum,
                        bd->channels[i]->ch_txcount);
        }
        return count;
}
static DEVICE_ATTR(ports_txcount, S_IRUSR, dgnc_ports_txcount_show, NULL);

/* this function creates the sys files that will export each signal status
 * to sysfs each value will be put in a separate filename
 */
void dgnc_create_ports_sysfiles(struct dgnc_board *bd)
{
        int rc = 0;

        dev_set_drvdata(&bd->pdev->dev, bd);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_state);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_baud);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_msignals);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_iflag);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_cflag);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_oflag);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_lflag);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_digi_flag);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_rxcount);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_txcount);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_vpd);
        rc |= device_create_file(&bd->pdev->dev, &dev_attr_serial_number);
        if (rc)
                dev_err(&bd->pdev->dev, "dgnc: sysfs device_create_file failed!\n");
}

/* removes all the sys files created for that port */
void dgnc_remove_ports_sysfiles(struct dgnc_board *bd)
{
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_state);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_baud);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_msignals);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_iflag);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_cflag);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_oflag);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_lflag);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_digi_flag);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_rxcount);
        device_remove_file(&bd->pdev->dev, &dev_attr_ports_txcount);
        device_remove_file(&bd->pdev->dev, &dev_attr_vpd);
        device_remove_file(&bd->pdev->dev, &dev_attr_serial_number);
}

static ssize_t dgnc_tty_state_show(struct device *d,
                                   struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%s",
                        un->un_open_count ? "Open" : "Closed");
}
static DEVICE_ATTR(state, S_IRUSR, dgnc_tty_state_show, NULL);

static ssize_t dgnc_tty_baud_show(struct device *d,
                                  struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%d\n", ch->ch_old_baud);
}
static DEVICE_ATTR(baud, S_IRUSR, dgnc_tty_baud_show, NULL);

static ssize_t dgnc_tty_msignals_show(struct device *d,
                                      struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        if (ch->ch_open_count) {
                return snprintf(buf, PAGE_SIZE, "%s %s %s %s %s %s\n",
                        (ch->ch_mostat & UART_MCR_RTS) ? "RTS" : "",
                        (ch->ch_mistat & UART_MSR_CTS) ? "CTS" : "",
                        (ch->ch_mostat & UART_MCR_DTR) ? "DTR" : "",
                        (ch->ch_mistat & UART_MSR_DSR) ? "DSR" : "",
                        (ch->ch_mistat & UART_MSR_DCD) ? "DCD" : "",
                        (ch->ch_mistat & UART_MSR_RI)  ? "RI"  : "");
        }
        return 0;
}
static DEVICE_ATTR(msignals, S_IRUSR, dgnc_tty_msignals_show, NULL);

static ssize_t dgnc_tty_iflag_show(struct device *d,
                                   struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_iflag);
}
static DEVICE_ATTR(iflag, S_IRUSR, dgnc_tty_iflag_show, NULL);

static ssize_t dgnc_tty_cflag_show(struct device *d,
                                   struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_cflag);
}
static DEVICE_ATTR(cflag, S_IRUSR, dgnc_tty_cflag_show, NULL);

static ssize_t dgnc_tty_oflag_show(struct device *d,
                                   struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_oflag);
}
static DEVICE_ATTR(oflag, S_IRUSR, dgnc_tty_oflag_show, NULL);

static ssize_t dgnc_tty_lflag_show(struct device *d,
                                   struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_lflag);
}
static DEVICE_ATTR(lflag, S_IRUSR, dgnc_tty_lflag_show, NULL);

static ssize_t dgnc_tty_digi_flag_show(struct device *d,
                                       struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_digi.digi_flags);
}
static DEVICE_ATTR(digi_flag, S_IRUSR, dgnc_tty_digi_flag_show, NULL);

static ssize_t dgnc_tty_rxcount_show(struct device *d,
                                     struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%ld\n", ch->ch_rxcount);
}
static DEVICE_ATTR(rxcount, S_IRUSR, dgnc_tty_rxcount_show, NULL);

static ssize_t dgnc_tty_txcount_show(struct device *d,
                                     struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%ld\n", ch->ch_txcount);
}
static DEVICE_ATTR(txcount, S_IRUSR, dgnc_tty_txcount_show, NULL);

static ssize_t dgnc_tty_name_show(struct device *d,
                                  struct device_attribute *attr, char *buf)
{
        struct dgnc_board *bd;
        struct channel_t *ch;
        struct un_t *un;

        if (!d)
                return 0;
        un = dev_get_drvdata(d);
        if (!un || un->magic != DGNC_UNIT_MAGIC)
                return 0;
        ch = un->un_ch;
        if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return 0;
        bd = ch->ch_bd;
        if (!bd || bd->magic != DGNC_BOARD_MAGIC)
                return 0;
        if (bd->state != BOARD_READY)
                return 0;

        return snprintf(buf, PAGE_SIZE, "%sn%d%c\n",
                (un->un_type == DGNC_PRINT) ? "pr" : "tty",
                bd->boardnum + 1, 'a' + ch->ch_portnum);
}
static DEVICE_ATTR(custom_name, S_IRUSR, dgnc_tty_name_show, NULL);

static struct attribute *dgnc_sysfs_tty_entries[] = {
        &dev_attr_state.attr,
        &dev_attr_baud.attr,
        &dev_attr_msignals.attr,
        &dev_attr_iflag.attr,
        &dev_attr_cflag.attr,
        &dev_attr_oflag.attr,
        &dev_attr_lflag.attr,
        &dev_attr_digi_flag.attr,
        &dev_attr_rxcount.attr,
        &dev_attr_txcount.attr,
        &dev_attr_custom_name.attr,
        NULL
};

static struct attribute_group dgnc_tty_attribute_group = {
        .name = NULL,
        .attrs = dgnc_sysfs_tty_entries,
};

void dgnc_create_tty_sysfs(struct un_t *un, struct device *c)
{
        int ret;

        ret = sysfs_create_group(&c->kobj, &dgnc_tty_attribute_group);
        if (ret) {
                dev_err(c, "dgnc: failed to create sysfs tty device attributes.\n");
                sysfs_remove_group(&c->kobj, &dgnc_tty_attribute_group);
                return;
        }

        dev_set_drvdata(c, un);
}

void dgnc_remove_tty_sysfs(struct device *c)
{
        sysfs_remove_group(&c->kobj, &dgnc_tty_attribute_group);
}