BBeOS/telephony/sms/q20-sms.c

/*
 * Q20 SMS Management
 * BlackBerry Classic Q20 SMS System
 *
 * This module provides SMS functionality including
 * message sending, receiving, storage, and notifications.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/timer.h>
#include <linux/notifier.h>
#include <linux/input.h>
#include <linux/leds.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio/consumer.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

#define Q20_SMS_DRIVER_NAME "q20-sms"
#define Q20_SMS_MAX_MESSAGES 1000
#define Q20_SMS_MAX_LENGTH 160
#define Q20_SMS_PHONE_LENGTH 32

/* SMS types */
enum q20_sms_type {
    Q20_SMS_TYPE_INCOMING,
    Q20_SMS_TYPE_OUTGOING,
    Q20_SMS_TYPE_DRAFT,
    Q20_SMS_TYPE_SENT,
    Q20_SMS_TYPE_FAILED
};

/* SMS status */
enum q20_sms_status {
    Q20_SMS_STATUS_UNREAD,
    Q20_SMS_STATUS_READ,
    Q20_SMS_STATUS_SENDING,
    Q20_SMS_STATUS_SENT,
    Q20_SMS_STATUS_FAILED,
    Q20_SMS_STATUS_DELIVERED
};

/* SMS message structure */
struct q20_sms_message {
    u32 id;
    enum q20_sms_type type;
    enum q20_sms_status status;
    char phone_number[Q20_SMS_PHONE_LENGTH];
    char contact_name[64];
    char message[Q20_SMS_MAX_LENGTH + 1];
    struct timespec timestamp;
    u8 priority;
    bool flash;
    u16 message_id;
    u8 part_number;
    u8 total_parts;
};

/* SMS management structure */
struct q20_sms {
    struct device *dev;
    struct work_struct work;
    struct timer_list notification_timer;
    struct mutex lock;
    
    /* Message storage */
    struct q20_sms_message messages[Q20_SMS_MAX_MESSAGES];
    u32 message_count;
    u32 next_message_id;
    
    /* Statistics */
    u32 total_messages;
    u32 unread_messages;
    u32 sent_messages;
    u32 failed_messages;
    
    /* Hardware controls */
    struct gpio_desc *vibrator_gpio;
    struct led_classdev *led_cdev;
    
    /* State */
    bool notifications_enabled;
    bool vibrate_enabled;
    bool led_enabled;
    
    /* Storage */
    struct proc_dir_entry *proc_dir;
    char storage_path[256];
};

static struct q20_sms *q20_sms_dev;

/* Message management functions */
static int q20_sms_add_message(struct q20_sms *sms, enum q20_sms_type type,
                              const char *phone_number, const char *message)
{
    struct q20_sms_message *msg;
    int ret = 0;
    
    if (!sms || !phone_number || !message) {
        return -EINVAL;
    }
    
    mutex_lock(&sms->lock);
    
    /* Check if we have space */
    if (sms->message_count >= Q20_SMS_MAX_MESSAGES) {
        dev_err(sms->dev, "SMS storage full\n");
        ret = -ENOMEM;
        goto unlock;
    }
    
    /* Find empty slot */
    msg = &sms->messages[sms->message_count];
    
    /* Initialize message */
    msg->id = sms->next_message_id++;
    msg->type = type;
    msg->status = (type == Q20_SMS_TYPE_INCOMING) ? Q20_SMS_STATUS_UNREAD : Q20_SMS_STATUS_SENDING;
    strncpy(msg->phone_number, phone_number, Q20_SMS_PHONE_LENGTH - 1);
    msg->phone_number[Q20_SMS_PHONE_LENGTH - 1] = '\0';
    strncpy(msg->message, message, Q20_SMS_MAX_LENGTH);
    msg->message[Q20_SMS_MAX_LENGTH] = '\0';
    ktime_get_ts(&msg->timestamp);
    msg->priority = 0;
    msg->flash = false;
    msg->message_id = 0;
    msg->part_number = 1;
    msg->total_parts = 1;
    
    /* Update statistics */
    sms->message_count++;
    sms->total_messages++;
    
    if (type == Q20_SMS_TYPE_INCOMING) {
        sms->unread_messages++;
    }
    
    dev_info(sms->dev, "Added SMS message %u: %s -> %s\n", 
             msg->id, phone_number, (type == Q20_SMS_TYPE_INCOMING) ? "IN" : "OUT");
    
unlock:
    mutex_unlock(&sms->lock);
    return ret;
}

static int q20_sms_mark_read(struct q20_sms *sms, u32 message_id)
{
    struct q20_sms_message *msg;
    int i, ret = -ENOENT;
    
    if (!sms) {
        return -EINVAL;
    }
    
    mutex_lock(&sms->lock);
    
    /* Find message */
    for (i = 0; i < sms->message_count; i++) {
        msg = &sms->messages[i];
        if (msg->id == message_id) {
            if (msg->status == Q20_SMS_STATUS_UNREAD) {
                msg->status = Q20_SMS_STATUS_READ;
                sms->unread_messages--;
                ret = 0;
            }
            break;
        }
    }
    
    mutex_unlock(&sms->lock);
    return ret;
}

static int q20_sms_delete_message(struct q20_sms *sms, u32 message_id)
{
    struct q20_sms_message *msg;
    int i, ret = -ENOENT;
    
    if (!sms) {
        return -EINVAL;
    }
    
    mutex_lock(&sms->lock);
    
    /* Find message */
    for (i = 0; i < sms->message_count; i++) {
        msg = &sms->messages[i];
        if (msg->id == message_id) {
            /* Update statistics */
            if (msg->status == Q20_SMS_STATUS_UNREAD) {
                sms->unread_messages--;
            }
            if (msg->type == Q20_SMS_TYPE_OUTGOING) {
                sms->sent_messages--;
            }
            
            /* Remove message by shifting remaining messages */
            if (i < sms->message_count - 1) {
                memmove(&sms->messages[i], &sms->messages[i + 1],
                        (sms->message_count - i - 1) * sizeof(struct q20_sms_message));
            }
            
            sms->message_count--;
            ret = 0;
            break;
        }
    }
    
    mutex_unlock(&sms->lock);
    return ret;
}

static int q20_sms_send_message(struct q20_sms *sms, const char *phone_number, 
                               const char *message)
{
    int ret;
    
    if (!sms || !phone_number || !message) {
        return -EINVAL;
    }
    
    /* Add message to storage */
    ret = q20_sms_add_message(sms, Q20_SMS_TYPE_OUTGOING, phone_number, message);
    if (ret < 0) {
        return ret;
    }
    
    /* TODO: Send message via modem */
    dev_info(sms->dev, "Sending SMS to %s: %s\n", phone_number, message);
    
    /* For now, mark as sent */
    sms->sent_messages++;
    
    return 0;
}

static int q20_sms_receive_message(struct q20_sms *sms, const char *phone_number,
                                  const char *message)
{
    int ret;
    
    if (!sms || !phone_number || !message) {
        return -EINVAL;
    }
    
    /* Add message to storage */
    ret = q20_sms_add_message(sms, Q20_SMS_TYPE_INCOMING, phone_number, message);
    if (ret < 0) {
        return ret;
    }
    
    /* Trigger notification */
    if (sms->notifications_enabled) {
        schedule_work(&sms->work);
    }
    
    return 0;
}

/* Notification functions */
static void q20_sms_notification_work(struct work_struct *work)
{
    struct q20_sms *sms = container_of(work, struct q20_sms, work);
    
    if (!sms) {
        return;
    }
    
    /* Vibrate */
    if (sms->vibrate_enabled && sms->vibrator_gpio) {
        gpiod_set_value_cansleep(sms->vibrator_gpio, 1);
        msleep(200);
        gpiod_set_value_cansleep(sms->vibrator_gpio, 0);
    }
    
    /* Flash LED */
    if (sms->led_enabled && sms->led_cdev) {
        /* TODO: Implement LED flashing */
    }
    
    dev_info(sms->dev, "SMS notification triggered\n");
}

static void q20_sms_notification_timer_callback(struct timer_list *t)
{
    struct q20_sms *sms = from_timer(sms, t, notification_timer);
    
    if (sms && sms->unread_messages > 0) {
        /* Schedule notification work */
        schedule_work(&sms->work);
    }
}

/* Storage functions */
static int q20_sms_save_messages(struct q20_sms *sms)
{
    struct file *file;
    mm_segment_t old_fs;
    int ret = 0;
    
    if (!sms) {
        return -EINVAL;
    }
    
    mutex_lock(&sms->lock);
    
    /* Open file for writing */
    old_fs = get_fs();
    set_fs(KERNEL_DS);
    
    file = filp_open(sms->storage_path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
    if (IS_ERR(file)) {
        ret = PTR_ERR(file);
        dev_err(sms->dev, "Failed to open SMS storage file: %d\n", ret);
        goto restore_fs;
    }
    
    /* Write messages */
    ret = vfs_write(file, sms->messages, 
                    sms->message_count * sizeof(struct q20_sms_message),
                    &file->f_pos);
    if (ret < 0) {
        dev_err(sms->dev, "Failed to write SMS messages: %d\n", ret);
    }
    
    filp_close(file, NULL);
    
restore_fs:
    set_fs(old_fs);
    mutex_unlock(&sms->lock);
    return ret;
}

static int q20_sms_load_messages(struct q20_sms *sms)
{
    struct file *file;
    mm_segment_t old_fs;
    int ret = 0;
    
    if (!sms) {
        return -EINVAL;
    }
    
    mutex_lock(&sms->lock);
    
    /* Open file for reading */
    old_fs = get_fs();
    set_fs(KERNEL_DS);
    
    file = filp_open(sms->storage_path, O_RDONLY, 0);
    if (IS_ERR(file)) {
        ret = PTR_ERR(file);
        if (ret != -ENOENT) {
            dev_err(sms->dev, "Failed to open SMS storage file: %d\n", ret);
        }
        goto restore_fs;
    }
    
    /* Read messages */
    ret = vfs_read(file, sms->messages, sizeof(sms->messages), &file->f_pos);
    if (ret > 0) {
        sms->message_count = ret / sizeof(struct q20_sms_message);
        sms->next_message_id = sms->message_count + 1;
        
        /* Count unread messages */
        int i;
        for (i = 0; i < sms->message_count; i++) {
            if (sms->messages[i].status == Q20_SMS_STATUS_UNREAD) {
                sms->unread_messages++;
            }
        }
        
        dev_info(sms->dev, "Loaded %u SMS messages\n", sms->message_count);
    }
    
    filp_close(file, NULL);
    
restore_fs:
    set_fs(old_fs);
    mutex_unlock(&sms->lock);
    return ret;
}

/* Proc filesystem interface */
static int q20_sms_proc_show(struct seq_file *m, void *v)
{
    struct q20_sms *sms = m->private;
    int i;
    
    if (!sms) {
        return -EINVAL;
    }
    
    seq_printf(m, "Q20 SMS Statistics\n");
    seq_printf(m, "==================\n");
    seq_printf(m, "Total messages: %u\n", sms->total_messages);
    seq_printf(m, "Unread messages: %u\n", sms->unread_messages);
    seq_printf(m, "Sent messages: %u\n", sms->sent_messages);
    seq_printf(m, "Failed messages: %u\n", sms->failed_messages);
    seq_printf(m, "Storage used: %u/%u\n", sms->message_count, Q20_SMS_MAX_MESSAGES);
    seq_printf(m, "\n");
    
    seq_printf(m, "Recent Messages\n");
    seq_printf(m, "===============\n");
    
    mutex_lock(&sms->lock);
    
    for (i = sms->message_count - 1; i >= 0 && i >= sms->message_count - 10; i--) {
        struct q20_sms_message *msg = &sms->messages[i];
        struct tm tm;
        
        time_to_tm(msg->timestamp.tv_sec, 0, &tm);
        
        seq_printf(m, "[%u] %s %s (%s) %02d/%02d/%04d %02d:%02d\n",
                   msg->id,
                   (msg->type == Q20_SMS_TYPE_INCOMING) ? "IN" : "OUT",
                   msg->phone_number,
                   (msg->status == Q20_SMS_STATUS_UNREAD) ? "UNREAD" : "READ",
                   tm.tm_mday, tm.tm_mon + 1, tm.tm_year + 1900,
                   tm.tm_hour, tm.tm_min);
        
        seq_printf(m, "    %s\n", msg->message);
        seq_printf(m, "\n");
    }
    
    mutex_unlock(&sms->lock);
    
    return 0;
}

static int q20_sms_proc_open(struct inode *inode, struct file *file)
{
    return single_open(file, q20_sms_proc_show, PDE_DATA(inode));
}

static const struct proc_ops q20_sms_proc_ops = {
    .proc_open = q20_sms_proc_open,
    .proc_read = seq_read,
    .proc_lseek = seq_lseek,
    .proc_release = single_release,
};

/* Module initialization */
static int __init q20_sms_init(void)
{
    struct q20_sms *sms;
    int ret;
    
    dev_info(NULL, "Initializing Q20 SMS system\n");
    
    sms = kzalloc(sizeof(*sms), GFP_KERNEL);
    if (!sms) {
        return -ENOMEM;
    }
    
    sms->dev = NULL; /* TODO: Get device from platform */
    mutex_init(&sms->lock);
    INIT_WORK(&sms->work, q20_sms_notification_work);
    
    /* Initialize notification timer */
    timer_setup(&sms->notification_timer, q20_sms_notification_timer_callback, 0);
    
    /* Get hardware controls */
    sms->vibrator_gpio = devm_gpiod_get_optional(sms->dev, "vibrator", GPIOD_OUT_LOW);
    if (IS_ERR(sms->vibrator_gpio)) {
        ret = PTR_ERR(sms->vibrator_gpio);
        dev_err(sms->dev, "Failed to get vibrator GPIO: %d\n", ret);
        goto error;
    }
    
    /* Set up storage path */
    snprintf(sms->storage_path, sizeof(sms->storage_path), "/data/sms_messages.dat");
    
    /* Load existing messages */
    ret = q20_sms_load_messages(sms);
    if (ret < 0 && ret != -ENOENT) {
        dev_err(sms->dev, "Failed to load SMS messages: %d\n", ret);
    }
    
    /* Create proc filesystem entry */
    sms->proc_dir = proc_mkdir("q20_sms", NULL);
    if (!sms->proc_dir) {
        dev_err(sms->dev, "Failed to create proc directory\n");
        ret = -ENOMEM;
        goto error;
    }
    
    if (!proc_create_data("messages", 0444, sms->proc_dir, 
                         &q20_sms_proc_ops, sms)) {
        dev_err(sms->dev, "Failed to create proc file\n");
        ret = -ENOMEM;
        goto error;
    }
    
    /* Enable notifications by default */
    sms->notifications_enabled = true;
    sms->vibrate_enabled = true;
    sms->led_enabled = true;
    
    q20_sms_dev = sms;
    
    dev_info(sms->dev, "Q20 SMS system initialized successfully\n");
    return 0;
    
error:
    if (sms) {
        if (sms->proc_dir) {
            remove_proc_entry("messages", sms->proc_dir);
            remove_proc_entry("q20_sms", NULL);
        }
        kfree(sms);
    }
    return ret;
}

/* Module cleanup */
static void __exit q20_sms_exit(void)
{
    struct q20_sms *sms = q20_sms_dev;
    
    if (sms) {
        dev_info(sms->dev, "Cleaning up Q20 SMS system\n");
        
        /* Save messages */
        q20_sms_save_messages(sms);
        
        /* Remove proc filesystem entries */
        if (sms->proc_dir) {
            remove_proc_entry("messages", sms->proc_dir);
            remove_proc_entry("q20_sms", NULL);
        }
        
        /* Cancel work and timer */
        cancel_work_sync(&sms->work);
        del_timer(&sms->notification_timer);
        
        kfree(sms);
        q20_sms_dev = NULL;
    }
}

module_init(q20_sms_init);
module_exit(q20_sms_exit);

MODULE_AUTHOR("BBeOS Team");
MODULE_DESCRIPTION("BlackBerry Classic Q20 SMS System");
MODULE_LICENSE("GPL v2");