// SPDX-License-Identifier: GPL-2.0+
//
// em28xx-camera.c - driver for Empia EM25xx/27xx/28xx USB video capture devices
//
// Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@kernel.org>
// Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>

#include "em28xx.h"

#include <linux/i2c.h>
#include <linux/usb.h>
#include <media/i2c/mt9v011.h>
#include <media/v4l2-common.h>

/* Possible i2c addresses of Micron sensors */
static unsigned short micron_sensor_addrs[] = {
        0xb8 >> 1,   /* MT9V111, MT9V403 */
        0xba >> 1,   /* MT9M001/011/111/112, MT9V011/012/112, MT9D011 */
        0x90 >> 1,   /* MT9V012/112, MT9D011 (alternative address) */
        I2C_CLIENT_END
};

/* Possible i2c addresses of Omnivision sensors */
static unsigned short omnivision_sensor_addrs[] = {
        0x42 >> 1,   /* OV7725, OV7670/60/48 */
        0x60 >> 1,   /* OV2640, OV9650/53/55 */
        I2C_CLIENT_END
};

/* FIXME: Should be replaced by a proper mt9m111 driver */
static int em28xx_initialize_mt9m111(struct em28xx *dev)
{
        int i;
        unsigned char regs[][3] = {
                { 0x0d, 0x00, 0x01, },  /* reset and use defaults */
                { 0x0d, 0x00, 0x00, },
                { 0x0a, 0x00, 0x21, },
                { 0x21, 0x04, 0x00, },  /* full readout spd, no row/col skip */
        };

        for (i = 0; i < ARRAY_SIZE(regs); i++)
                i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
                                &regs[i][0], 3);

        /* FIXME: This won't be creating a sensor at the media graph */

        return 0;
}

/* FIXME: Should be replaced by a proper mt9m001 driver */
static int em28xx_initialize_mt9m001(struct em28xx *dev)
{
        int i;
        unsigned char regs[][3] = {
                { 0x0d, 0x00, 0x01, },
                { 0x0d, 0x00, 0x00, },
                { 0x04, 0x05, 0x00, },  /* hres = 1280 */
                { 0x03, 0x04, 0x00, },  /* vres = 1024 */
                { 0x20, 0x11, 0x00, },
                { 0x06, 0x00, 0x10, },
                { 0x2b, 0x00, 0x24, },
                { 0x2e, 0x00, 0x24, },
                { 0x35, 0x00, 0x24, },
                { 0x2d, 0x00, 0x20, },
                { 0x2c, 0x00, 0x20, },
                { 0x09, 0x0a, 0xd4, },
                { 0x35, 0x00, 0x57, },
        };

        for (i = 0; i < ARRAY_SIZE(regs); i++)
                i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
                                &regs[i][0], 3);

        /* FIXME: This won't be creating a sensor at the media graph */

        return 0;
}

/*
 * Probes Micron sensors with 8 bit address and 16 bit register width
 */
static int em28xx_probe_sensor_micron(struct em28xx *dev)
{
        int ret, i;
        char *name;
        u16 id;

        struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];

        dev->em28xx_sensor = EM28XX_NOSENSOR;
        for (i = 0; micron_sensor_addrs[i] != I2C_CLIENT_END; i++) {
                client->addr = micron_sensor_addrs[i];
                /* Read chip ID from register 0x00 */
                ret = i2c_smbus_read_word_data(client, 0x00); /* assumes LE */
                if (ret < 0) {
                        if (ret != -ENXIO)
                                dev_err(&dev->intf->dev,
                                        "couldn't read from i2c device 0x%02x: error %i\n",
                                       client->addr << 1, ret);
                        continue;
                }
                id = swab16(ret); /* LE -> BE */
                /* Read chip ID from register 0xff */
                ret = i2c_smbus_read_word_data(client, 0xff);
                if (ret < 0) {
                        dev_err(&dev->intf->dev,
                                "couldn't read from i2c device 0x%02x: error %i\n",
                                client->addr << 1, ret);
                        continue;
                }
                /* Validate chip ID to be sure we have a Micron device */
                if (id != swab16(ret))
                        continue;
                /* Check chip ID */
                switch (id) {
                case 0x1222:
                        name = "MT9V012"; /* MI370 */ /* 640x480 */
                        break;
                case 0x1229:
                        name = "MT9V112"; /* 640x480 */
                        break;
                case 0x1433:
                        name = "MT9M011"; /* 1280x1024 */
                        break;
                case 0x143a:    /* found in the ECS G200 */
                        name = "MT9M111"; /* MI1310 */ /* 1280x1024 */
                        dev->em28xx_sensor = EM28XX_MT9M111;
                        break;
                case 0x148c:
                        name = "MT9M112"; /* MI1320 */ /* 1280x1024 */
                        break;
                case 0x1511:
                        name = "MT9D011"; /* MI2010 */ /* 1600x1200 */
                        break;
                case 0x8232:
                case 0x8243:    /* rev B */
                        name = "MT9V011"; /* MI360 */ /* 640x480 */
                        dev->em28xx_sensor = EM28XX_MT9V011;
                        break;
                case 0x8431:
                        name = "MT9M001"; /* 1280x1024 */
                        dev->em28xx_sensor = EM28XX_MT9M001;
                        break;
                default:
                        dev_info(&dev->intf->dev,
                                 "unknown Micron sensor detected: 0x%04x\n",
                                 id);
                        return 0;
                }

                if (dev->em28xx_sensor == EM28XX_NOSENSOR)
                        dev_info(&dev->intf->dev,
                                 "unsupported sensor detected: %s\n", name);
                else
                        dev_info(&dev->intf->dev,
                                 "sensor %s detected\n", name);

                return 0;
        }

        return -ENODEV;
}

/*
 * Probes Omnivision sensors with 8 bit address and register width
 */
static int em28xx_probe_sensor_omnivision(struct em28xx *dev)
{
        int ret, i;
        char *name;
        u8 reg;
        u16 id;
        struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];

        dev->em28xx_sensor = EM28XX_NOSENSOR;
        /*
         * NOTE: these devices have the register auto incrementation disabled
         * by default, so we have to use single byte reads !
         */
        for (i = 0; omnivision_sensor_addrs[i] != I2C_CLIENT_END; i++) {
                client->addr = omnivision_sensor_addrs[i];
                /* Read manufacturer ID from registers 0x1c-0x1d (BE) */
                reg = 0x1c;
                ret = i2c_smbus_read_byte_data(client, reg);
                if (ret < 0) {
                        if (ret != -ENXIO)
                                dev_err(&dev->intf->dev,
                                        "couldn't read from i2c device 0x%02x: error %i\n",
                                        client->addr << 1, ret);
                        continue;
                }
                id = ret << 8;
                reg = 0x1d;
                ret = i2c_smbus_read_byte_data(client, reg);
                if (ret < 0) {
                        dev_err(&dev->intf->dev,
                                "couldn't read from i2c device 0x%02x: error %i\n",
                                client->addr << 1, ret);
                        continue;
                }
                id += ret;
                /* Check manufacturer ID */
                if (id != 0x7fa2)
                        continue;
                /* Read product ID from registers 0x0a-0x0b (BE) */
                reg = 0x0a;
                ret = i2c_smbus_read_byte_data(client, reg);
                if (ret < 0) {
                        dev_err(&dev->intf->dev,
                                "couldn't read from i2c device 0x%02x: error %i\n",
                                client->addr << 1, ret);
                        continue;
                }
                id = ret << 8;
                reg = 0x0b;
                ret = i2c_smbus_read_byte_data(client, reg);
                if (ret < 0) {
                        dev_err(&dev->intf->dev,
                                "couldn't read from i2c device 0x%02x: error %i\n",
                                client->addr << 1, ret);
                        continue;
                }
                id += ret;
                /* Check product ID */
                switch (id) {
                case 0x2642:
                        name = "OV2640";
                        dev->em28xx_sensor = EM28XX_OV2640;
                        break;
                case 0x7648:
                        name = "OV7648";
                        break;
                case 0x7660:
                        name = "OV7660";
                        break;
                case 0x7673:
                        name = "OV7670";
                        break;
                case 0x7720:
                        name = "OV7720";
                        break;
                case 0x7721:
                        name = "OV7725";
                        break;
                case 0x9648: /* Rev 2 */
                case 0x9649: /* Rev 3 */
                        name = "OV9640";
                        break;
                case 0x9650:
                case 0x9652: /* OV9653 */
                        name = "OV9650";
                        break;
                case 0x9656: /* Rev 4 */
                case 0x9657: /* Rev 5 */
                        name = "OV9655";
                        break;
                default:
                        dev_info(&dev->intf->dev,
                                 "unknown OmniVision sensor detected: 0x%04x\n",
                                id);
                        return 0;
                }

                if (dev->em28xx_sensor == EM28XX_NOSENSOR)
                        dev_info(&dev->intf->dev,
                                 "unsupported sensor detected: %s\n", name);
                else
                        dev_info(&dev->intf->dev,
                                 "sensor %s detected\n", name);

                return 0;
        }

        return -ENODEV;
}

int em28xx_detect_sensor(struct em28xx *dev)
{
        int ret;

        ret = em28xx_probe_sensor_micron(dev);

        if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0)
                ret = em28xx_probe_sensor_omnivision(dev);

        /*
         * NOTE: the Windows driver also probes i2c addresses
         *       0x22 (Samsung ?) and 0x66 (Kodak ?)
         */

        if (dev->em28xx_sensor == EM28XX_NOSENSOR && ret < 0) {
                dev_info(&dev->intf->dev,
                         "No sensor detected\n");
                return -ENODEV;
        }

        return 0;
}

int em28xx_init_camera(struct em28xx *dev)
{
        struct i2c_client *client = &dev->i2c_client[dev->def_i2c_bus];
        struct i2c_adapter *adap = &dev->i2c_adap[dev->def_i2c_bus];
        struct em28xx_v4l2 *v4l2 = dev->v4l2;

        switch (dev->em28xx_sensor) {
        case EM28XX_MT9V011:
        {
                struct mt9v011_platform_data pdata;
                struct i2c_board_info mt9v011_info = {
                        .type = "mt9v011",
                        .addr = client->addr,
                        .platform_data = &pdata,
                };

                v4l2->sensor_xres = 640;
                v4l2->sensor_yres = 480;

                /*
                 * FIXME: mt9v011 uses I2S speed as xtal clk - at least with
                 * the Silvercrest cam I have here for testing - for higher
                 * resolutions, a high clock cause horizontal artifacts, so we
                 * need to use a lower xclk frequency.
                 * Yet, it would be possible to adjust xclk depending on the
                 * desired resolution, since this affects directly the
                 * frame rate.
                 */
                dev->board.xclk = EM28XX_XCLK_FREQUENCY_4_3MHZ;
                em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
                v4l2->sensor_xtal = 4300000;
                pdata.xtal = v4l2->sensor_xtal;
                if (NULL ==
                    v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
                                              &mt9v011_info, NULL))
                        return -ENODEV;
                v4l2->vinmode = EM28XX_VINMODE_RGB8_GRBG;
                v4l2->vinctl = 0x00;

                break;
        }
        case EM28XX_MT9M001:
                v4l2->sensor_xres = 1280;
                v4l2->sensor_yres = 1024;

                em28xx_initialize_mt9m001(dev);

                v4l2->vinmode = EM28XX_VINMODE_RGB8_BGGR;
                v4l2->vinctl = 0x00;

                break;
        case EM28XX_MT9M111:
                v4l2->sensor_xres = 640;
                v4l2->sensor_yres = 512;

                dev->board.xclk = EM28XX_XCLK_FREQUENCY_48MHZ;
                em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
                em28xx_initialize_mt9m111(dev);

                v4l2->vinmode = EM28XX_VINMODE_YUV422_UYVY;
                v4l2->vinctl = 0x00;

                break;
        case EM28XX_OV2640:
        {
                struct v4l2_subdev *subdev;
                struct i2c_board_info ov2640_info = {
                        .type = "ov2640",
                        .flags = I2C_CLIENT_SCCB,
                        .addr = client->addr,
                };
                struct v4l2_subdev_format format = {
                        .which = V4L2_SUBDEV_FORMAT_ACTIVE,
                };

                /*
                 * FIXME: sensor supports resolutions up to 1600x1200, but
                 * resolution setting/switching needs to be modified to
                 * - switch sensor output resolution (including further
                 *   configuration changes)
                 * - adjust bridge xclk
                 * - disable 16 bit (12 bit) output formats on high resolutions
                 */
                v4l2->sensor_xres = 640;
                v4l2->sensor_yres = 480;

                subdev =
                     v4l2_i2c_new_subdev_board(&v4l2->v4l2_dev, adap,
                                               &ov2640_info, NULL);
                if (!subdev)
                        return -ENODEV;

                format.format.code = MEDIA_BUS_FMT_YUYV8_2X8;
                format.format.width = 640;
                format.format.height = 480;
                v4l2_subdev_call(subdev, pad, set_fmt, NULL, &format);

                /* NOTE: for UXGA=1600x1200 switch to 12MHz */
                dev->board.xclk = EM28XX_XCLK_FREQUENCY_24MHZ;
                em28xx_write_reg(dev, EM28XX_R0F_XCLK, dev->board.xclk);
                v4l2->vinmode = EM28XX_VINMODE_YUV422_YUYV;
                v4l2->vinctl = 0x00;

                break;
        }
        case EM28XX_NOSENSOR:
        default:
                return -EINVAL;
        }

        return 0;
}
EXPORT_SYMBOL_GPL(em28xx_init_camera);