BBeOS/telephony/voice/q20-voice.c

/*
 * Q20 Voice Call Management
 * BlackBerry Classic Q20 Voice Call System
 *
 * This module provides voice call functionality including
 * dialing, answering, call management, and audio routing.
 */

#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/sound/soc.h>
#include <linux/sound/soc-dapm.h>

#define Q20_VOICE_DRIVER_NAME "q20-voice"

/* Call states */
enum q20_call_state {
    Q20_CALL_STATE_IDLE,
    Q20_CALL_STATE_DIALING,
    Q20_CALL_STATE_INCOMING,
    Q20_CALL_STATE_ACTIVE,
    Q20_CALL_STATE_HOLD,
    Q20_CALL_STATE_ENDED
};

/* Call types */
enum q20_call_type {
    Q20_CALL_TYPE_VOICE,
    Q20_CALL_TYPE_VIDEO,
    Q20_CALL_TYPE_CONFERENCE
};

/* Call direction */
enum q20_call_direction {
    Q20_CALL_DIRECTION_INCOMING,
    Q20_CALL_DIRECTION_OUTGOING,
    Q20_CALL_DIRECTION_MISSED
};

/* Call structure */
struct q20_call {
    u8 call_id;
    enum q20_call_state state;
    enum q20_call_type type;
    enum q20_call_direction direction;
    char phone_number[32];
    char contact_name[64];
    struct timespec start_time;
    struct timespec end_time;
    u32 duration;
    bool speaker_on;
    bool mute_on;
    bool hold_on;
};

/* Voice management structure */
struct q20_voice {
    struct device *dev;
    struct work_struct work;
    struct timer_list call_timer;
    struct mutex lock;
    
    /* Call management */
    struct q20_call current_call;
    struct q20_call last_call;
    u8 next_call_id;
    
    /* Audio routing */
    struct snd_soc_codec *codec;
    struct regulator *audio_vdd;
    struct gpio_desc *speaker_gpio;
    struct gpio_desc *mic_gpio;
    struct gpio_desc *headset_detect_gpio;
    
    /* Hardware controls */
    struct gpio_desc *vibrator_gpio;
    struct led_classdev *led_cdev;
    
    /* State */
    bool headset_connected;
    bool speaker_enabled;
    bool mute_enabled;
    bool vibrate_enabled;
    
    /* Statistics */
    u32 total_calls;
    u32 missed_calls;
    u32 total_duration;
};

static struct q20_voice *q20_voice_dev;

/* Audio routing functions */
static int q20_voice_route_audio(struct q20_voice *voice, bool speaker)
{
    int ret = 0;
    
    if (!voice) {
        return -EINVAL;
    }
    
    mutex_lock(&voice->lock);
    
    if (speaker) {
        /* Route audio to speaker */
        if (voice->speaker_gpio) {
            gpiod_set_value_cansleep(voice->speaker_gpio, 1);
        }
        
        /* Configure codec for speaker output */
        if (voice->codec) {
            ret = snd_soc_dapm_enable_pin(&voice->codec->dapm, "Speaker");
            if (ret < 0) {
                dev_err(voice->dev, "Failed to enable speaker: %d\n", ret);
            }
            
            ret = snd_soc_dapm_disable_pin(&voice->codec->dapm, "Earpiece");
            if (ret < 0) {
                dev_err(voice->dev, "Failed to disable earpiece: %d\n", ret);
            }
        }
        
        voice->speaker_enabled = true;
    } else {
        /* Route audio to earpiece */
        if (voice->speaker_gpio) {
            gpiod_set_value_cansleep(voice->speaker_gpio, 0);
        }
        
        /* Configure codec for earpiece output */
        if (voice->codec) {
            ret = snd_soc_dapm_disable_pin(&voice->codec->dapm, "Speaker");
            if (ret < 0) {
                dev_err(voice->dev, "Failed to disable speaker: %d\n", ret);
            }
            
            ret = snd_soc_dapm_enable_pin(&voice->codec->dapm, "Earpiece");
            if (ret < 0) {
                dev_err(voice->dev, "Failed to enable earpiece: %d\n", ret);
            }
        }
        
        voice->speaker_enabled = false;
    }
    
    /* Update DAPM */
    if (voice->codec) {
        snd_soc_dapm_sync(&voice->codec->dapm);
    }
    
    mutex_unlock(&voice->lock);
    return ret;
}

static int q20_voice_configure_mic(struct q20_voice *voice, bool enable)
{
    int ret = 0;
    
    if (!voice) {
        return -EINVAL;
    }
    
    mutex_lock(&voice->lock);
    
    if (enable) {
        /* Enable microphone */
        if (voice->mic_gpio) {
            gpiod_set_value_cansleep(voice->mic_gpio, 1);
        }
        
        /* Configure codec for microphone input */
        if (voice->codec) {
            ret = snd_soc_dapm_enable_pin(&voice->codec->dapm, "Mic");
            if (ret < 0) {
                dev_err(voice->dev, "Failed to enable microphone: %d\n", ret);
            }
        }
    } else {
        /* Disable microphone */
        if (voice->mic_gpio) {
            gpiod_set_value_cansleep(voice->mic_gpio, 0);
        }
        
        /* Configure codec for microphone input */
        if (voice->codec) {
            ret = snd_soc_dapm_disable_pin(&voice->codec->dapm, "Mic");
            if (ret < 0) {
                dev_err(voice->dev, "Failed to disable microphone: %d\n", ret);
            }
        }
    }
    
    /* Update DAPM */
    if (voice->codec) {
        snd_soc_dapm_sync(&voice->codec->dapm);
    }
    
    mutex_unlock(&voice->lock);
    return ret;
}

/* Call management functions */
static void q20_voice_start_call_timer(struct q20_voice *voice)
{
    if (voice && voice->current_call.state == Q20_CALL_STATE_ACTIVE) {
        mod_timer(&voice->call_timer, jiffies + HZ);
    }
}

static void q20_voice_stop_call_timer(struct q20_voice *voice)
{
    if (voice) {
        del_timer(&voice->call_timer);
    }
}

static void q20_voice_call_timer_callback(struct timer_list *t)
{
    struct q20_voice *voice = from_timer(voice, t, call_timer);
    
    if (voice && voice->current_call.state == Q20_CALL_STATE_ACTIVE) {
        /* Update call duration */
        voice->current_call.duration++;
        
        /* Restart timer */
        mod_timer(&voice->call_timer, jiffies + HZ);
    }
}

static int q20_voice_dial_call(struct q20_voice *voice, const char *phone_number)
{
    int ret = 0;
    
    if (!voice || !phone_number) {
        return -EINVAL;
    }
    
    mutex_lock(&voice->lock);
    
    /* Check if already in call */
    if (voice->current_call.state != Q20_CALL_STATE_IDLE) {
        dev_err(voice->dev, "Already in call\n");
        ret = -EBUSY;
        goto unlock;
    }
    
    /* Initialize call structure */
    voice->current_call.call_id = voice->next_call_id++;
    voice->current_call.state = Q20_CALL_STATE_DIALING;
    voice->current_call.type = Q20_CALL_TYPE_VOICE;
    voice->current_call.direction = Q20_CALL_DIRECTION_OUTGOING;
    strncpy(voice->current_call.phone_number, phone_number, 
            sizeof(voice->current_call.phone_number) - 1);
    voice->current_call.phone_number[sizeof(voice->current_call.phone_number) - 1] = '\0';
    
    /* Configure audio for dialing */
    ret = q20_voice_route_audio(voice, false); /* Use earpiece initially */
    if (ret < 0) {
        dev_err(voice->dev, "Failed to configure audio: %d\n", ret);
        goto unlock;
    }
    
    ret = q20_voice_configure_mic(voice, true);
    if (ret < 0) {
        dev_err(voice->dev, "Failed to configure microphone: %d\n", ret);
        goto unlock;
    }
    
    /* TODO: Send dial command to modem */
    dev_info(voice->dev, "Dialing %s\n", phone_number);
    
    voice->total_calls++;
    
unlock:
    mutex_unlock(&voice->lock);
    return ret;
}

static int q20_voice_answer_call(struct q20_voice *voice)
{
    int ret = 0;
    
    if (!voice) {
        return -EINVAL;
    }
    
    mutex_lock(&voice->lock);
    
    if (voice->current_call.state != Q20_CALL_STATE_INCOMING) {
        dev_err(voice->dev, "No incoming call to answer\n");
        ret = -EINVAL;
        goto unlock;
    }
    
    /* Update call state */
    voice->current_call.state = Q20_CALL_STATE_ACTIVE;
    ktime_get_ts(&voice->current_call.start_time);
    
    /* Configure audio for active call */
    ret = q20_voice_route_audio(voice, false); /* Use earpiece initially */
    if (ret < 0) {
        dev_err(voice->dev, "Failed to configure audio: %d\n", ret);
        goto unlock;
    }
    
    ret = q20_voice_configure_mic(voice, true);
    if (ret < 0) {
        dev_err(voice->dev, "Failed to configure microphone: %d\n", ret);
        goto unlock;
    }
    
    /* Start call timer */
    q20_voice_start_call_timer(voice);
    
    /* TODO: Send answer command to modem */
    dev_info(voice->dev, "Answered call from %s\n", voice->current_call.phone_number);
    
unlock:
    mutex_unlock(&voice->lock);
    return ret;
}

static int q20_voice_end_call(struct q20_voice *voice)
{
    int ret = 0;
    
    if (!voice) {
        return -EINVAL;
    }
    
    mutex_lock(&voice->lock);
    
    if (voice->current_call.state == Q20_CALL_STATE_IDLE) {
        dev_err(voice->dev, "No active call to end\n");
        ret = -EINVAL;
        goto unlock;
    }
    
    /* Stop call timer */
    q20_voice_stop_call_timer(voice);
    
    /* Update call state */
    voice->current_call.state = Q20_CALL_STATE_ENDED;
    ktime_get_ts(&voice->current_call.end_time);
    
    /* Calculate call duration */
    voice->current_call.duration = 
        (voice->current_call.end_time.tv_sec - voice->current_call.start_time.tv_sec);
    
    /* Update statistics */
    voice->total_duration += voice->current_call.duration;
    
    /* Configure audio for idle state */
    ret = q20_voice_route_audio(voice, false);
    if (ret < 0) {
        dev_err(voice->dev, "Failed to configure audio: %d\n", ret);
    }
    
    ret = q20_voice_configure_mic(voice, false);
    if (ret < 0) {
        dev_err(voice->dev, "Failed to configure microphone: %d\n", ret);
    }
    
    /* Save call history */
    memcpy(&voice->last_call, &voice->current_call, sizeof(voice->current_call));
    
    /* Reset current call */
    memset(&voice->current_call, 0, sizeof(voice->current_call));
    voice->current_call.state = Q20_CALL_STATE_IDLE;
    
    /* TODO: Send end call command to modem */
    dev_info(voice->dev, "Ended call, duration: %u seconds\n", voice->last_call.duration);
    
unlock:
    mutex_unlock(&voice->lock);
    return ret;
}

static int q20_voice_toggle_speaker(struct q20_voice *voice)
{
    int ret = 0;
    
    if (!voice) {
        return -EINVAL;
    }
    
    mutex_lock(&voice->lock);
    
    if (voice->current_call.state != Q20_CALL_STATE_ACTIVE) {
        dev_err(voice->dev, "No active call\n");
        ret = -EINVAL;
        goto unlock;
    }
    
    /* Toggle speaker state */
    voice->current_call.speaker_on = !voice->current_call.speaker_on;
    
    /* Configure audio routing */
    ret = q20_voice_route_audio(voice, voice->current_call.speaker_on);
    if (ret < 0) {
        dev_err(voice->dev, "Failed to toggle speaker: %d\n", ret);
        voice->current_call.speaker_on = !voice->current_call.speaker_on; /* Revert */
    }
    
    dev_info(voice->dev, "Speaker %s\n", voice->current_call.speaker_on ? "ON" : "OFF");
    
unlock:
    mutex_unlock(&voice->lock);
    return ret;
}

static int q20_voice_toggle_mute(struct q20_voice *voice)
{
    int ret = 0;
    
    if (!voice) {
        return -EINVAL;
    }
    
    mutex_lock(&voice->lock);
    
    if (voice->current_call.state != Q20_CALL_STATE_ACTIVE) {
        dev_err(voice->dev, "No active call\n");
        ret = -EINVAL;
        goto unlock;
    }
    
    /* Toggle mute state */
    voice->current_call.mute_on = !voice->current_call.mute_on;
    
    /* Configure microphone */
    ret = q20_voice_configure_mic(voice, !voice->current_call.mute_on);
    if (ret < 0) {
        dev_err(voice->dev, "Failed to toggle mute: %d\n", ret);
        voice->current_call.mute_on = !voice->current_call.mute_on; /* Revert */
    }
    
    dev_info(voice->dev, "Mute %s\n", voice->current_call.mute_on ? "ON" : "OFF");
    
unlock:
    mutex_unlock(&voice->lock);
    return ret;
}

/* Work queue handler */
static void q20_voice_work_handler(struct work_struct *work)
{
    struct q20_voice *voice = container_of(work, struct q20_voice, work);
    
    /* Process voice events */
    /* TODO: Handle incoming calls, call state changes, etc. */
}

/* Input event handler */
static int q20_voice_input_event(struct notifier_block *nb, unsigned long type, void *data)
{
    struct input_event *ev = data;
    struct q20_voice *voice = q20_voice_dev;
    
    if (!voice) {
        return NOTIFY_DONE;
    }
    
    /* Handle input events for call control */
    if (type == EV_KEY) {
        switch (ev->code) {
            case KEY_SEND:
                if (ev->value) {
                    /* Send key pressed */
                    if (voice->current_call.state == Q20_CALL_STATE_INCOMING) {
                        q20_voice_answer_call(voice);
                    } else if (voice->current_call.state == Q20_CALL_STATE_IDLE) {
                        /* TODO: Open dialer */
                    }
                }
                break;
                
            case KEY_END:
                if (ev->value) {
                    /* End key pressed */
                    if (voice->current_call.state != Q20_CALL_STATE_IDLE) {
                        q20_voice_end_call(voice);
                    }
                }
                break;
                
            case KEY_VOLUMEUP:
                if (ev->value) {
                    /* Volume up pressed */
                    /* TODO: Increase call volume */
                }
                break;
                
            case KEY_VOLUMEDOWN:
                if (ev->value) {
                    /* Volume down pressed */
                    /* TODO: Decrease call volume */
                }
                break;
        }
    }
    
    return NOTIFY_DONE;
}

static struct notifier_block q20_voice_input_notifier = {
    .notifier_call = q20_voice_input_event,
};

/* Module initialization */
static int __init q20_voice_init(void)
{
    struct q20_voice *voice;
    int ret;
    
    dev_info(NULL, "Initializing Q20 voice system\n");
    
    voice = kzalloc(sizeof(*voice), GFP_KERNEL);
    if (!voice) {
        return -ENOMEM;
    }
    
    voice->dev = NULL; /* TODO: Get device from platform */
    mutex_init(&voice->lock);
    INIT_WORK(&voice->work, q20_voice_work_handler);
    
    /* Initialize call timer */
    timer_setup(&voice->call_timer, q20_voice_call_timer_callback, 0);
    
    /* Get GPIO controls */
    voice->speaker_gpio = devm_gpiod_get_optional(voice->dev, "speaker", GPIOD_OUT_LOW);
    if (IS_ERR(voice->speaker_gpio)) {
        ret = PTR_ERR(voice->speaker_gpio);
        dev_err(voice->dev, "Failed to get speaker GPIO: %d\n", ret);
        goto error;
    }
    
    voice->mic_gpio = devm_gpiod_get_optional(voice->dev, "mic", GPIOD_OUT_LOW);
    if (IS_ERR(voice->mic_gpio)) {
        ret = PTR_ERR(voice->mic_gpio);
        dev_err(voice->dev, "Failed to get mic GPIO: %d\n", ret);
        goto error;
    }
    
    voice->headset_detect_gpio = devm_gpiod_get_optional(voice->dev, "headset-detect", GPIOD_IN);
    if (IS_ERR(voice->headset_detect_gpio)) {
        ret = PTR_ERR(voice->headset_detect_gpio);
        dev_err(voice->dev, "Failed to get headset detect GPIO: %d\n", ret);
        goto error;
    }
    
    voice->vibrator_gpio = devm_gpiod_get_optional(voice->dev, "vibrator", GPIOD_OUT_LOW);
    if (IS_ERR(voice->vibrator_gpio)) {
        ret = PTR_ERR(voice->vibrator_gpio);
        dev_err(voice->dev, "Failed to get vibrator GPIO: %d\n", ret);
        goto error;
    }
    
    /* Get regulators */
    voice->audio_vdd = devm_regulator_get(voice->dev, "audio-vdd");
    if (IS_ERR(voice->audio_vdd)) {
        ret = PTR_ERR(voice->audio_vdd);
        if (ret != -EPROBE_DEFER) {
            dev_err(voice->dev, "Failed to get audio VDD regulator: %d\n", ret);
        }
        goto error;
    }
    
    /* Initialize call state */
    voice->current_call.state = Q20_CALL_STATE_IDLE;
    voice->next_call_id = 1;
    
    /* Register input notifier */
    ret = input_register_notifier(&q20_voice_input_notifier);
    if (ret < 0) {
        dev_err(voice->dev, "Failed to register input notifier: %d\n", ret);
        goto error;
    }
    
    /* Enable audio power */
    if (voice->audio_vdd) {
        ret = regulator_enable(voice->audio_vdd);
        if (ret < 0) {
            dev_err(voice->dev, "Failed to enable audio VDD: %d\n", ret);
            goto error;
        }
    }
    
    q20_voice_dev = voice;
    
    dev_info(voice->dev, "Q20 voice system initialized successfully\n");
    return 0;
    
error:
    if (voice) {
        if (voice->audio_vdd) {
            regulator_disable(voice->audio_vdd);
        }
        kfree(voice);
    }
    return ret;
}

/* Module cleanup */
static void __exit q20_voice_exit(void)
{
    struct q20_voice *voice = q20_voice_dev;
    
    if (voice) {
        dev_info(voice->dev, "Cleaning up Q20 voice system\n");
        
        /* Unregister input notifier */
        input_unregister_notifier(&q20_voice_input_notifier);
        
        /* Stop call timer */
        q20_voice_stop_call_timer(voice);
        
        /* End any active call */
        if (voice->current_call.state != Q20_CALL_STATE_IDLE) {
            q20_voice_end_call(voice);
        }
        
        /* Disable audio power */
        if (voice->audio_vdd) {
            regulator_disable(voice->audio_vdd);
        }
        
        kfree(voice);
        q20_voice_dev = NULL;
    }
}

module_init(q20_voice_init);
module_exit(q20_voice_exit);

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