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/*

 * SSD0303 OLED controller with OSRAM Pictiva 96x16 display.

 *

 * Copyright (c) 2006-2007 CodeSourcery.

 * Written by Paul Brook

 *

 * This code is licensed under the GPL.

 */

/* The controller can support a variety of different displays, but we only

   implement one.  Most of the commends relating to brightness and geometry

   setup are ignored. */

#include "hw/i2c/i2c.h"

#include "ui/console.h"

//#define DEBUG_SSD0303 1

#ifdef DEBUG_SSD0303

#define DPRINTF(fmt, ...) \

do { printf("ssd0303: " fmt , ## __VA_ARGS__); } while (0)

#define BADF(fmt, ...) \

do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__); exit(1);} while (0)

#else

#define DPRINTF(fmt, ...) do {} while(0)

#define BADF(fmt, ...) \

do { fprintf(stderr, "ssd0303: error: " fmt , ## __VA_ARGS__);} while (0)

#endif

/* Scaling factor for pixels.  */

#define MAGNIFY 4

enum ssd0303_mode

{

    SSD0303_IDLE,

    SSD0303_DATA,

    SSD0303_CMD

};

enum ssd0303_cmd {

    SSD0303_CMD_NONE,

    SSD0303_CMD_SKIP1

};

typedef struct {

    I2CSlave i2c;

    QemuConsole *con;

    int row;

    int col;

    int start_line;

    int mirror;

    int flash;

    int enabled;

    int inverse;

    int redraw;

    enum ssd0303_mode mode;

    enum ssd0303_cmd cmd_state;

    uint8_t framebuffer[132*8];

} ssd0303_state;

static int ssd0303_recv(I2CSlave *i2c)

{

    BADF("Reads not implemented\n");

    return -1;

}

static int ssd0303_send(I2CSlave *i2c, uint8_t data)

{

    ssd0303_state *s = (ssd0303_state *)i2c;

    enum ssd0303_cmd old_cmd_state;

    switch (s->mode) {

    case SSD0303_IDLE:

        DPRINTF("byte 0x%02x\n", data);

        if (data == 0x80)

            s->mode = SSD0303_CMD;

        else if (data == 0x40)

            s->mode = SSD0303_DATA;

        else

            BADF("Unexpected byte 0x%x\n", data);

        break;

    case SSD0303_DATA:

        DPRINTF("data 0x%02x\n", data);

        if (s->col < 132) {

            s->framebuffer[s->col + s->row * 132] = data;

            s->col++;

            s->redraw = 1;

        }

        break;

    case SSD0303_CMD:

        old_cmd_state = s->cmd_state;

        s->cmd_state = SSD0303_CMD_NONE;

        switch (old_cmd_state) {

        case SSD0303_CMD_NONE:

            DPRINTF("cmd 0x%02x\n", data);

            s->mode = SSD0303_IDLE;

            switch (data) {

            case 0x00 ... 0x0f: /* Set lower column address.  */

                s->col = (s->col & 0xf0) | (data & 0xf);

                break;

            case 0x10 ... 0x20: /* Set higher column address.  */

                s->col = (s->col & 0x0f) | ((data & 0xf) << 4);

                break;

            case 0x40 ... 0x7f: /* Set start line.  */

                s->start_line = 0;

                break;

            case 0x81: /* Set contrast (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xa0: /* Mirror off.  */

                s->mirror = 0;

                break;

            case 0xa1: /* Mirror off.  */

                s->mirror = 1;

                break;

            case 0xa4: /* Entire display off.  */

                s->flash = 0;

                break;

            case 0xa5: /* Entire display on.  */

                s->flash = 1;

                break;

            case 0xa6: /* Inverse off.  */

                s->inverse = 0;

                break;

            case 0xa7: /* Inverse on.  */

                s->inverse = 1;

                break;

            case 0xa8: /* Set multiplied ratio (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xad: /* DC-DC power control.  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xae: /* Display off.  */

                s->enabled = 0;

                break;

            case 0xaf: /* Display on.  */

                s->enabled = 1;

                break;

            case 0xb0 ... 0xbf: /* Set Page address.  */

                s->row = data & 7;

                break;

            case 0xc0 ... 0xc8: /* Set COM output direction (Ignored).  */

                break;

            case 0xd3: /* Set display offset (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xd5: /* Set display clock (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xd8: /* Set color and power mode (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xd9: /* Set pre-charge period (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xda: /* Set COM pin configuration (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xdb: /* Set VCOM dselect level (Ignored).  */

                s->cmd_state = SSD0303_CMD_SKIP1;

                break;

            case 0xe3: /* no-op.  */

                break;

            default:

                BADF("Unknown command: 0x%x\n", data);

            }

            break;

        case SSD0303_CMD_SKIP1:

            DPRINTF("skip 0x%02x\n", data);

            break;

        }

        break;

    }

    return 0;

}

static void ssd0303_event(I2CSlave *i2c, enum i2c_event event)

{

    ssd0303_state *s = (ssd0303_state *)i2c;

    switch (event) {

    case I2C_FINISH:

        s->mode = SSD0303_IDLE;

        break;

    case I2C_START_RECV:

    case I2C_START_SEND:

    case I2C_NACK:

        /* Nothing to do.  */

        break;

    }

}

static void ssd0303_update_display(void *opaque)

{

    ssd0303_state *s = (ssd0303_state *)opaque;

    DisplaySurface *surface = qemu_console_surface(s->con);

    uint8_t *dest;

    uint8_t *src;

    int x;

    int y;

    int line;

    char *colors[2];

    char colortab[MAGNIFY * 8];

    int dest_width;

    uint8_t mask;

    if (!s->redraw)

        return;

    switch (surface_bits_per_pixel(surface)) {

    case 0:

        return;

    case 15:

        dest_width = 2;

        break;

    case 16:

        dest_width = 2;

        break;

    case 24:

        dest_width = 3;

        break;

    case 32:

        dest_width = 4;

        break;

    default:

        BADF("Bad color depth\n");

        return;

    }

    dest_width *= MAGNIFY;

    memset(colortab, 0xff, dest_width);

    memset(colortab + dest_width, 0, dest_width);

    if (s->flash) {

        colors[0] = colortab;

        colors[1] = colortab;

    } else if (s->inverse) {

        colors[0] = colortab;

        colors[1] = colortab + dest_width;

    } else {

        colors[0] = colortab + dest_width;

        colors[1] = colortab;

    }

    dest = surface_data(surface);

    for (y = 0; y < 16; y++) {

        line = (y + s->start_line) & 63;

        src = s->framebuffer + 132 * (line >> 3) + 36;

        mask = 1 << (line & 7);

        for (x = 0; x < 96; x++) {

            memcpy(dest, colors[(*src & mask) != 0], dest_width);

            dest += dest_width;

            src++;

        }

        for (x = 1; x < MAGNIFY; x++) {

            memcpy(dest, dest - dest_width * 96, dest_width * 96);

            dest += dest_width * 96;

        }

    }

    s->redraw = 0;

    dpy_gfx_update(s->con, 0, 0, 96 * MAGNIFY, 16 * MAGNIFY);

}

static void ssd0303_invalidate_display(void * opaque)

{

    ssd0303_state *s = (ssd0303_state *)opaque;

    s->redraw = 1;

}

static const VMStateDescription vmstate_ssd0303 = {

    .name = "ssd0303_oled",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField []) {

        VMSTATE_INT32(row, ssd0303_state),

        VMSTATE_INT32(col, ssd0303_state),

        VMSTATE_INT32(start_line, ssd0303_state),

        VMSTATE_INT32(mirror, ssd0303_state),

        VMSTATE_INT32(flash, ssd0303_state),

        VMSTATE_INT32(enabled, ssd0303_state),

        VMSTATE_INT32(inverse, ssd0303_state),

        VMSTATE_INT32(redraw, ssd0303_state),

        VMSTATE_UINT32(mode, ssd0303_state),

        VMSTATE_UINT32(cmd_state, ssd0303_state),

        VMSTATE_BUFFER(framebuffer, ssd0303_state),

        VMSTATE_I2C_SLAVE(i2c, ssd0303_state),

        VMSTATE_END_OF_LIST()

    }

};

static int ssd0303_init(I2CSlave *i2c)

{

    ssd0303_state *s = FROM_I2C_SLAVE(ssd0303_state, i2c);

    s->con = graphic_console_init(ssd0303_update_display,

                                  ssd0303_invalidate_display,

                                  NULL, s);

    qemu_console_resize(s->con, 96 * MAGNIFY, 16 * MAGNIFY);

    return 0;

}

static void ssd0303_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);

    k->init = ssd0303_init;

    k->event = ssd0303_event;

    k->recv = ssd0303_recv;

    k->send = ssd0303_send;

    dc->vmsd = &vmstate_ssd0303;

}

static const TypeInfo ssd0303_info = {

    .name          = "ssd0303",

    .parent        = TYPE_I2C_SLAVE,

    .instance_size = sizeof(ssd0303_state),

    .class_init    = ssd0303_class_init,

};

static void ssd0303_register_types(void)

{

    type_register_static(&ssd0303_info);

}

type_init(ssd0303_register_types)