// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de>
 * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support)
 * Lothar Waßmann <LW@KARO-electronics.de> (DT support)
 * Dario Binacchi <dario.binacchi@amarulasolutions.com> (regmap support)
 */

/*
 * This is a driver for the EDT "Polytouch" family of touch controllers
 * based on the FocalTech FT5x06 line of chips.
 *
 * Development of this driver has been sponsored by Glyn:
 *    http://www.glyn.com/Products/Displays
 */

#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/ratelimit.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include <linux/unaligned.h>

#define WORK_REGISTER_THRESHOLD         0x00
#define WORK_REGISTER_REPORT_RATE       0x08
#define WORK_REGISTER_GAIN              0x30
#define WORK_REGISTER_OFFSET            0x31
#define WORK_REGISTER_NUM_X             0x33
#define WORK_REGISTER_NUM_Y             0x34

#define PMOD_REGISTER_ACTIVE            0x00
#define PMOD_REGISTER_HIBERNATE         0x03

#define M09_REGISTER_THRESHOLD          0x80
#define M09_REGISTER_GAIN               0x92
#define M09_REGISTER_OFFSET             0x93
#define M09_REGISTER_NUM_X              0x94
#define M09_REGISTER_NUM_Y              0x95

#define M12_REGISTER_REPORT_RATE        0x88

#define EV_REGISTER_THRESHOLD           0x40
#define EV_REGISTER_GAIN                0x41
#define EV_REGISTER_OFFSET_Y            0x45
#define EV_REGISTER_OFFSET_X            0x46

#define NO_REGISTER                     0xff

#define WORK_REGISTER_OPMODE            0x3c
#define FACTORY_REGISTER_OPMODE         0x01
#define PMOD_REGISTER_OPMODE            0xa5

#define TOUCH_EVENT_DOWN                0x00
#define TOUCH_EVENT_UP                  0x01
#define TOUCH_EVENT_ON                  0x02
#define TOUCH_EVENT_RESERVED            0x03

#define EDT_NAME_LEN                    23
#define EDT_SWITCH_MODE_RETRIES         10
#define EDT_SWITCH_MODE_DELAY           5 /* msec */
#define EDT_RAW_DATA_RETRIES            100
#define EDT_RAW_DATA_DELAY              1000 /* usec */

#define EDT_DEFAULT_NUM_X               1024
#define EDT_DEFAULT_NUM_Y               1024

#define M06_REG_CMD(factory) ((factory) ? 0xf3 : 0xfc)
#define M06_REG_ADDR(factory, addr) ((factory) ? (addr) & 0x7f : (addr) & 0x3f)

enum edt_pmode {
        EDT_PMODE_NOT_SUPPORTED,
        EDT_PMODE_HIBERNATE,
        EDT_PMODE_POWEROFF,
};

enum edt_ver {
        EDT_M06,
        EDT_M09,
        EDT_M12,
        EV_FT,
        GENERIC_FT,
};

struct edt_reg_addr {
        int reg_threshold;
        int reg_report_rate;
        int reg_gain;
        int reg_offset;
        int reg_offset_x;
        int reg_offset_y;
        int reg_num_x;
        int reg_num_y;
};

struct edt_ft5x06_ts_data {
        struct i2c_client *client;
        struct input_dev *input;
        struct touchscreen_properties prop;
        u16 num_x;
        u16 num_y;
        struct regulator *vcc;
        struct regulator *iovcc;

        struct gpio_desc *reset_gpio;
        struct gpio_desc *wake_gpio;

        struct regmap *regmap;

#if defined(CONFIG_DEBUG_FS)
        u8 *raw_buffer;
        size_t raw_bufsize;
#endif

        struct mutex mutex;
        bool factory_mode;
        enum edt_pmode suspend_mode;
        int threshold;
        int gain;
        int offset;
        int offset_x;
        int offset_y;
        int report_rate;
        int max_support_points;
        int point_len;
        u8 tdata_cmd;
        int tdata_len;
        int tdata_offset;

        char name[EDT_NAME_LEN];
        char fw_version[EDT_NAME_LEN];

        struct edt_reg_addr reg_addr;
        enum edt_ver version;
        unsigned int crc_errors;
        unsigned int header_errors;
};

struct edt_i2c_chip_data {
        int  max_support_points;
};

static const struct regmap_config edt_ft5x06_i2c_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
};

static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
                                    u8 *buf, int buflen)
{
        int i;
        u8 crc = 0;

        for (i = 0; i < buflen - 1; i++)
                crc ^= buf[i];

        if (crc != buf[buflen - 1]) {
                tsdata->crc_errors++;
                dev_err_ratelimited(&tsdata->client->dev,
                                    "crc error: 0x%02x expected, got 0x%02x\n",
                                    crc, buf[buflen - 1]);
                return false;
        }

        return true;
}

static int edt_M06_i2c_read(void *context, const void *reg_buf, size_t reg_size,
                            void *val_buf, size_t val_size)
{
        struct device *dev = context;
        struct i2c_client *i2c = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(i2c);
        struct i2c_msg xfer[2];
        bool reg_read = false;
        u8 addr;
        u8 wlen;
        u8 wbuf[4], rbuf[3];
        int ret;

        addr = *((u8 *)reg_buf);
        wbuf[0] = addr;
        switch (addr) {
        case 0xf5:
                wlen = 3;
                wbuf[0] = 0xf5;
                wbuf[1] = 0xe;
                wbuf[2] = *((u8 *)val_buf);
                break;
        case 0xf9:
                wlen = 1;
                break;
        default:
                wlen = 2;
                reg_read = true;
                wbuf[0] = M06_REG_CMD(tsdata->factory_mode);
                wbuf[1] = M06_REG_ADDR(tsdata->factory_mode, addr);
                wbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;
        }

        xfer[0].addr  = i2c->addr;
        xfer[0].flags = 0;
        xfer[0].len = wlen;
        xfer[0].buf = wbuf;

        xfer[1].addr = i2c->addr;
        xfer[1].flags = I2C_M_RD;
        xfer[1].len = reg_read ? 2 : val_size;
        xfer[1].buf = reg_read ? rbuf : val_buf;

        ret = i2c_transfer(i2c->adapter, xfer, 2);
        if (ret != 2) {
                if (ret < 0)
                        return ret;

                return -EIO;
        }

        if (addr == 0xf9) {
                u8 *buf = (u8 *)val_buf;

                if (buf[0] != 0xaa || buf[1] != 0xaa ||
                    buf[2] != val_size) {
                        tsdata->header_errors++;
                        dev_err_ratelimited(dev,
                                            "Unexpected header: %02x%02x%02x\n",
                                            buf[0], buf[1], buf[2]);
                        return -EIO;
                }

                if (!edt_ft5x06_ts_check_crc(tsdata, val_buf, val_size))
                        return -EIO;
        } else if (reg_read) {
                wbuf[2] = rbuf[0];
                wbuf[3] = rbuf[1];
                if (!edt_ft5x06_ts_check_crc(tsdata, wbuf, 4))
                        return -EIO;

                *((u8 *)val_buf) = rbuf[0];
        }

        return 0;
}

static int edt_M06_i2c_write(void *context, const void *data, size_t count)
{
        struct device *dev = context;
        struct i2c_client *i2c = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(i2c);
        u8 addr, val;
        u8 wbuf[4];
        struct i2c_msg xfer;
        int ret;

        addr = *((u8 *)data);
        val = *((u8 *)data + 1);

        wbuf[0] = M06_REG_CMD(tsdata->factory_mode);
        wbuf[1] = M06_REG_ADDR(tsdata->factory_mode, addr);
        wbuf[2] = val;
        wbuf[3] = wbuf[0] ^ wbuf[1] ^ wbuf[2];

        xfer.addr  = i2c->addr;
        xfer.flags = 0;
        xfer.len = 4;
        xfer.buf = wbuf;

        ret = i2c_transfer(i2c->adapter, &xfer, 1);
        if (ret != 1) {
                if (ret < 0)
                        return ret;

                return -EIO;
        }

        return 0;
}

static const struct regmap_config edt_M06_i2c_regmap_config = {
        .reg_bits = 8,
        .val_bits = 8,
        .read = edt_M06_i2c_read,
        .write = edt_M06_i2c_write,
};

static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
{
        struct edt_ft5x06_ts_data *tsdata = dev_id;
        struct device *dev = &tsdata->client->dev;
        u8 rdbuf[63];
        int i, type, x, y, id;
        int error;

        memset(rdbuf, 0, sizeof(rdbuf));
        error = regmap_bulk_read(tsdata->regmap, tsdata->tdata_cmd, rdbuf,
                                 tsdata->tdata_len);
        if (error) {
                dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
                                    error);
                goto out;
        }

        for (i = 0; i < tsdata->max_support_points; i++) {
                u8 *buf = &rdbuf[i * tsdata->point_len + tsdata->tdata_offset];

                type = buf[0] >> 6;
                /* ignore Reserved events */
                if (type == TOUCH_EVENT_RESERVED)
                        continue;

                /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */
                if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN)
                        continue;

                x = get_unaligned_be16(buf) & 0x0fff;
                y = get_unaligned_be16(buf + 2) & 0x0fff;
                /* The FT5x26 send the y coordinate first */
                if (tsdata->version == EV_FT)
                        swap(x, y);

                id = (buf[2] >> 4) & 0x0f;

                input_mt_slot(tsdata->input, id);
                if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
                                               type != TOUCH_EVENT_UP))
                        touchscreen_report_pos(tsdata->input, &tsdata->prop,
                                               x, y, true);
        }

        input_mt_report_pointer_emulation(tsdata->input, true);
        input_sync(tsdata->input);

out:
        return IRQ_HANDLED;
}

struct edt_ft5x06_attribute {
        struct device_attribute dattr;
        size_t field_offset;
        u8 limit_low;
        u8 limit_high;
        u8 addr_m06;
        u8 addr_m09;
        u8 addr_ev;
};

#define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev,         \
                _limit_low, _limit_high)                                \
        struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = {        \
                .dattr = __ATTR(_field, _mode,                          \
                                edt_ft5x06_setting_show,                \
                                edt_ft5x06_setting_store),              \
                .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \
                .addr_m06 = _addr_m06,                                  \
                .addr_m09 = _addr_m09,                                  \
                .addr_ev  = _addr_ev,                                   \
                .limit_low = _limit_low,                                \
                .limit_high = _limit_high,                              \
        }

static ssize_t edt_ft5x06_setting_show(struct device *dev,
                                       struct device_attribute *dattr,
                                       char *buf)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
        struct edt_ft5x06_attribute *attr =
                        container_of(dattr, struct edt_ft5x06_attribute, dattr);
        u8 *field = (u8 *)tsdata + attr->field_offset;
        unsigned int val;
        size_t count = 0;
        int error = 0;
        u8 addr;

        mutex_lock(&tsdata->mutex);

        if (tsdata->factory_mode) {
                error = -EIO;
                goto out;
        }

        switch (tsdata->version) {
        case EDT_M06:
                addr = attr->addr_m06;
                break;

        case EDT_M09:
        case EDT_M12:
        case GENERIC_FT:
                addr = attr->addr_m09;
                break;

        case EV_FT:
                addr = attr->addr_ev;
                break;

        default:
                error = -ENODEV;
                goto out;
        }

        if (addr != NO_REGISTER) {
                error = regmap_read(tsdata->regmap, addr, &val);
                if (error) {
                        dev_err(&tsdata->client->dev,
                                "Failed to fetch attribute %s, error %d\n",
                                dattr->attr.name, error);
                        goto out;
                }
        } else {
                val = *field;
        }

        if (val != *field) {
                dev_warn(&tsdata->client->dev,
                         "%s: read (%d) and stored value (%d) differ\n",
                         dattr->attr.name, val, *field);
                *field = val;
        }

        count = sysfs_emit(buf, "%d\n", val);
out:
        mutex_unlock(&tsdata->mutex);
        return error ?: count;
}

static ssize_t edt_ft5x06_setting_store(struct device *dev,
                                        struct device_attribute *dattr,
                                        const char *buf, size_t count)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
        struct edt_ft5x06_attribute *attr =
                        container_of(dattr, struct edt_ft5x06_attribute, dattr);
        u8 *field = (u8 *)tsdata + attr->field_offset;
        unsigned int val;
        int error;
        u8 addr;

        mutex_lock(&tsdata->mutex);

        if (tsdata->factory_mode) {
                error = -EIO;
                goto out;
        }

        error = kstrtouint(buf, 0, &val);
        if (error)
                goto out;

        if (val < attr->limit_low || val > attr->limit_high) {
                error = -ERANGE;
                goto out;
        }

        switch (tsdata->version) {
        case EDT_M06:
                addr = attr->addr_m06;
                break;

        case EDT_M09:
        case EDT_M12:
        case GENERIC_FT:
                addr = attr->addr_m09;
                break;

        case EV_FT:
                addr = attr->addr_ev;
                break;

        default:
                error = -ENODEV;
                goto out;
        }

        if (addr != NO_REGISTER) {
                error = regmap_write(tsdata->regmap, addr, val);
                if (error) {
                        dev_err(&tsdata->client->dev,
                                "Failed to update attribute %s, error: %d\n",
                                dattr->attr.name, error);
                        goto out;
                }
        }
        *field = val;

out:
        mutex_unlock(&tsdata->mutex);
        return error ?: count;
}

/* m06, m09: range 0-31, m12: range 0-5 */
static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN,
                M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31);
/* m06, m09: range 0-31, m12: range 0-16 */
static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET,
                M09_REGISTER_OFFSET, NO_REGISTER, 0, 31);
/* m06, m09, m12: no supported, ev_ft: range 0-80 */
static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
                EV_REGISTER_OFFSET_X, 0, 80);
/* m06, m09, m12: no supported, ev_ft: range 0-80 */
static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER,
                EV_REGISTER_OFFSET_Y, 0, 80);
/* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */
static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD,
                M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255);
/* m06: range 3 to 14, m12: range 1 to 255 */
static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE,
                M12_REGISTER_REPORT_RATE, NO_REGISTER, 0, 255);

static ssize_t model_show(struct device *dev, struct device_attribute *attr,
                          char *buf)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

        return sysfs_emit(buf, "%s\n", tsdata->name);
}

static DEVICE_ATTR_RO(model);

static ssize_t fw_version_show(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

        return sysfs_emit(buf, "%s\n", tsdata->fw_version);
}

static DEVICE_ATTR_RO(fw_version);

/* m06 only */
static ssize_t header_errors_show(struct device *dev,
                                  struct device_attribute *attr, char *buf)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

        return sysfs_emit(buf, "%d\n", tsdata->header_errors);
}

static DEVICE_ATTR_RO(header_errors);

/* m06 only */
static ssize_t crc_errors_show(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

        return sysfs_emit(buf, "%d\n", tsdata->crc_errors);
}

static DEVICE_ATTR_RO(crc_errors);

static struct attribute *edt_ft5x06_attrs[] = {
        &edt_ft5x06_attr_gain.dattr.attr,
        &edt_ft5x06_attr_offset.dattr.attr,
        &edt_ft5x06_attr_offset_x.dattr.attr,
        &edt_ft5x06_attr_offset_y.dattr.attr,
        &edt_ft5x06_attr_threshold.dattr.attr,
        &edt_ft5x06_attr_report_rate.dattr.attr,
        &dev_attr_model.attr,
        &dev_attr_fw_version.attr,
        &dev_attr_header_errors.attr,
        &dev_attr_crc_errors.attr,
        NULL
};
ATTRIBUTE_GROUPS(edt_ft5x06);

static void edt_ft5x06_restore_reg_parameters(struct edt_ft5x06_ts_data *tsdata)
{
        struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
        struct regmap *regmap = tsdata->regmap;

        regmap_write(regmap, reg_addr->reg_threshold, tsdata->threshold);
        regmap_write(regmap, reg_addr->reg_gain, tsdata->gain);
        if (reg_addr->reg_offset != NO_REGISTER)
                regmap_write(regmap, reg_addr->reg_offset, tsdata->offset);
        if (reg_addr->reg_offset_x != NO_REGISTER)
                regmap_write(regmap, reg_addr->reg_offset_x, tsdata->offset_x);
        if (reg_addr->reg_offset_y != NO_REGISTER)
                regmap_write(regmap, reg_addr->reg_offset_y, tsdata->offset_y);
        if (reg_addr->reg_report_rate != NO_REGISTER)
                regmap_write(regmap, reg_addr->reg_report_rate,
                             tsdata->report_rate);
}

#ifdef CONFIG_DEBUG_FS
static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
{
        struct i2c_client *client = tsdata->client;
        int retries = EDT_SWITCH_MODE_RETRIES;
        unsigned int val;
        int error;

        if (tsdata->version != EDT_M06) {
                dev_err(&client->dev,
                        "No factory mode support for non-M06 devices\n");
                return -EINVAL;
        }

        disable_irq(client->irq);

        if (!tsdata->raw_buffer) {
                tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y *
                                      sizeof(u16);
                tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL);
                if (!tsdata->raw_buffer) {
                        error = -ENOMEM;
                        goto err_out;
                }
        }

        /* mode register is 0x3c when in the work mode */
        error = regmap_write(tsdata->regmap, WORK_REGISTER_OPMODE, 0x03);
        if (error) {
                dev_err(&client->dev,
                        "failed to switch to factory mode, error %d\n", error);
                goto err_out;
        }

        tsdata->factory_mode = true;
        do {
                mdelay(EDT_SWITCH_MODE_DELAY);
                /* mode register is 0x01 when in factory mode */
                error = regmap_read(tsdata->regmap, FACTORY_REGISTER_OPMODE,
                                    &val);
                if (!error && val == 0x03)
                        break;
        } while (--retries > 0);

        if (retries == 0) {
                dev_err(&client->dev, "not in factory mode after %dms.\n",
                        EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
                error = -EIO;
                goto err_out;
        }

        return 0;

err_out:
        kfree(tsdata->raw_buffer);
        tsdata->raw_buffer = NULL;
        tsdata->factory_mode = false;
        enable_irq(client->irq);

        return error;
}

static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata)
{
        struct i2c_client *client = tsdata->client;
        int retries = EDT_SWITCH_MODE_RETRIES;
        unsigned int val;
        int error;

        /* mode register is 0x01 when in the factory mode */
        error = regmap_write(tsdata->regmap, FACTORY_REGISTER_OPMODE, 0x1);
        if (error) {
                dev_err(&client->dev,
                        "failed to switch to work mode, error: %d\n", error);
                return error;
        }

        tsdata->factory_mode = false;

        do {
                mdelay(EDT_SWITCH_MODE_DELAY);
                /* mode register is 0x01 when in factory mode */
                error = regmap_read(tsdata->regmap, WORK_REGISTER_OPMODE, &val);
                if (!error && val == 0x01)
                        break;
        } while (--retries > 0);

        if (retries == 0) {
                dev_err(&client->dev, "not in work mode after %dms.\n",
                        EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY);
                tsdata->factory_mode = true;
                return -EIO;
        }

        kfree(tsdata->raw_buffer);
        tsdata->raw_buffer = NULL;

        edt_ft5x06_restore_reg_parameters(tsdata);
        enable_irq(client->irq);

        return 0;
}

static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode)
{
        struct edt_ft5x06_ts_data *tsdata = data;

        *mode = tsdata->factory_mode;

        return 0;
};

static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode)
{
        struct edt_ft5x06_ts_data *tsdata = data;
        int retval = 0;

        if (mode > 1)
                return -ERANGE;

        mutex_lock(&tsdata->mutex);

        if (mode != tsdata->factory_mode) {
                retval = mode ? edt_ft5x06_factory_mode(tsdata) :
                                edt_ft5x06_work_mode(tsdata);
        }

        mutex_unlock(&tsdata->mutex);

        return retval;
};

DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get,
                        edt_ft5x06_debugfs_mode_set, "%llu\n");

static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file,
                                                char __user *buf, size_t count,
                                                loff_t *off)
{
        struct edt_ft5x06_ts_data *tsdata = file->private_data;
        struct i2c_client *client = tsdata->client;
        int retries  = EDT_RAW_DATA_RETRIES;
        unsigned int val;
        int i, error;
        size_t read = 0;
        int colbytes;
        u8 *rdbuf;

        if (*off < 0 || *off >= tsdata->raw_bufsize)
                return 0;

        mutex_lock(&tsdata->mutex);

        if (!tsdata->factory_mode || !tsdata->raw_buffer) {
                error = -EIO;
                goto out;
        }

        error = regmap_write(tsdata->regmap, 0x08, 0x01);
        if (error) {
                dev_err(&client->dev,
                        "failed to write 0x08 register, error %d\n", error);
                goto out;
        }

        do {
                usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100);
                error = regmap_read(tsdata->regmap, 0x08, &val);
                if (error) {
                        dev_err(&client->dev,
                                "failed to read 0x08 register, error %d\n",
                                error);
                        goto out;
                }

                if (val == 1)
                        break;
        } while (--retries > 0);

        if (retries == 0) {
                dev_err(&client->dev,
                        "timed out waiting for register to settle\n");
                error = -ETIMEDOUT;
                goto out;
        }

        rdbuf = tsdata->raw_buffer;
        colbytes = tsdata->num_y * sizeof(u16);

        for (i = 0; i < tsdata->num_x; i++) {
                rdbuf[0] = i;  /* column index */
                error = regmap_bulk_read(tsdata->regmap, 0xf5, rdbuf, colbytes);
                if (error)
                        goto out;

                rdbuf += colbytes;
        }

        read = min_t(size_t, count, tsdata->raw_bufsize - *off);
        if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) {
                error = -EFAULT;
                goto out;
        }

        *off += read;
out:
        mutex_unlock(&tsdata->mutex);
        return error ?: read;
};

static const struct file_operations debugfs_raw_data_fops = {
        .open = simple_open,
        .read = edt_ft5x06_debugfs_raw_data_read,
};

static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
        struct dentry *debug_dir = tsdata->client->debugfs;

        debugfs_create_u16("num_x", S_IRUSR, debug_dir, &tsdata->num_x);
        debugfs_create_u16("num_y", S_IRUSR, debug_dir, &tsdata->num_y);

        debugfs_create_file("mode", S_IRUSR | S_IWUSR,
                            debug_dir, tsdata, &debugfs_mode_fops);
        debugfs_create_file("raw_data", S_IRUSR,
                            debug_dir, tsdata, &debugfs_raw_data_fops);
}

static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
        kfree(tsdata->raw_buffer);
}

#else

static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata)
{
        return -ENOSYS;
}

static void edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
}

static void edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
}

#endif /* CONFIG_DEBUGFS */

static int edt_ft5x06_ts_identify(struct i2c_client *client,
                                  struct edt_ft5x06_ts_data *tsdata)
{
        u8 rdbuf[EDT_NAME_LEN];
        char *p;
        int error;
        char *model_name = tsdata->name;
        char *fw_version = tsdata->fw_version;

        /* see what we find if we assume it is a M06 *
         * if we get less than EDT_NAME_LEN, we don't want
         * to have garbage in there
         */
        memset(rdbuf, 0, sizeof(rdbuf));
        error = regmap_bulk_read(tsdata->regmap, 0xBB, rdbuf, EDT_NAME_LEN - 1);
        if (error)
                return error;

        /* Probe content for something consistent.
         * M06 starts with a response byte, M12 gives the data directly.
         * M09/Generic does not provide model number information.
         */
        if (!strncasecmp(rdbuf + 1, "EP0", 3)) {
                tsdata->version = EDT_M06;

                /* remove last '$' end marker */
                rdbuf[EDT_NAME_LEN - 1] = '\0';
                if (rdbuf[EDT_NAME_LEN - 2] == '$')
                        rdbuf[EDT_NAME_LEN - 2] = '\0';

                /* look for Model/Version separator */
                p = strchr(rdbuf, '*');
                if (p)
                        *p++ = '\0';
                strscpy(model_name, rdbuf + 1, EDT_NAME_LEN);
                strscpy(fw_version, p ? p : "", EDT_NAME_LEN);

                regmap_exit(tsdata->regmap);
                tsdata->regmap = regmap_init_i2c(client,
                                                 &edt_M06_i2c_regmap_config);
                if (IS_ERR(tsdata->regmap)) {
                        dev_err(&client->dev, "regmap allocation failed\n");
                        return PTR_ERR(tsdata->regmap);
                }
        } else if (!strncasecmp(rdbuf, "EP0", 3)) {
                tsdata->version = EDT_M12;

                /* remove last '$' end marker */
                rdbuf[EDT_NAME_LEN - 2] = '\0';
                if (rdbuf[EDT_NAME_LEN - 3] == '$')
                        rdbuf[EDT_NAME_LEN - 3] = '\0';

                /* look for Model/Version separator */
                p = strchr(rdbuf, '*');
                if (p)
                        *p++ = '\0';
                strscpy(model_name, rdbuf, EDT_NAME_LEN);
                strscpy(fw_version, p ? p : "", EDT_NAME_LEN);
        } else {
                /* If it is not an EDT M06/M12 touchscreen, then the model
                 * detection is a bit hairy. The different ft5x06
                 * firmwares around don't reliably implement the
                 * identification registers. Well, we'll take a shot.
                 *
                 * The main difference between generic focaltec based
                 * touches and EDT M09 is that we know how to retrieve
                 * the max coordinates for the latter.
                 */
                tsdata->version = GENERIC_FT;

                error = regmap_bulk_read(tsdata->regmap, 0xA6, rdbuf, 2);
                if (error)
                        return error;

                strscpy(fw_version, rdbuf, 2);

                error = regmap_bulk_read(tsdata->regmap, 0xA8, rdbuf, 1);
                if (error)
                        return error;

                /* This "model identification" is not exact. Unfortunately
                 * not all firmwares for the ft5x06 put useful values in
                 * the identification registers.
                 */
                switch (rdbuf[0]) {
                case 0x11:   /* EDT EP0110M09 */
                case 0x35:   /* EDT EP0350M09 */
                case 0x43:   /* EDT EP0430M09 */
                case 0x50:   /* EDT EP0500M09 */
                case 0x57:   /* EDT EP0570M09 */
                case 0x70:   /* EDT EP0700M09 */
                        tsdata->version = EDT_M09;
                        snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09",
                                 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
                        break;
                case 0xa1:   /* EDT EP1010ML00 */
                        tsdata->version = EDT_M09;
                        snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00",
                                 rdbuf[0] >> 4, rdbuf[0] & 0x0F);
                        break;
                case 0x5a:   /* Solomon Goldentek Display */
                        snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0");
                        break;
                case 0x59:  /* Evervision Display with FT5xx6 TS */
                        tsdata->version = EV_FT;
                        error = regmap_bulk_read(tsdata->regmap, 0x53, rdbuf, 1);
                        if (error)
                                return error;
                        strscpy(fw_version, rdbuf, 1);
                        snprintf(model_name, EDT_NAME_LEN,
                                 "EVERVISION-FT5726NEi");
                        break;
                default:
                        snprintf(model_name, EDT_NAME_LEN,
                                 "generic ft5x06 (%02x)",
                                 rdbuf[0]);
                        break;
                }
        }

        return 0;
}

static void edt_ft5x06_ts_get_defaults(struct device *dev,
                                       struct edt_ft5x06_ts_data *tsdata)
{
        struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
        struct regmap *regmap = tsdata->regmap;
        u32 val;
        int error;

        error = device_property_read_u32(dev, "threshold", &val);
        if (!error) {
                regmap_write(regmap, reg_addr->reg_threshold, val);
                tsdata->threshold = val;
        }

        error = device_property_read_u32(dev, "gain", &val);
        if (!error) {
                regmap_write(regmap, reg_addr->reg_gain, val);
                tsdata->gain = val;
        }

        error = device_property_read_u32(dev, "offset", &val);
        if (!error) {
                if (reg_addr->reg_offset != NO_REGISTER)
                        regmap_write(regmap, reg_addr->reg_offset, val);
                tsdata->offset = val;
        }

        error = device_property_read_u32(dev, "offset-x", &val);
        if (!error) {
                if (reg_addr->reg_offset_x != NO_REGISTER)
                        regmap_write(regmap, reg_addr->reg_offset_x, val);
                tsdata->offset_x = val;
        }

        error = device_property_read_u32(dev, "offset-y", &val);
        if (!error) {
                if (reg_addr->reg_offset_y != NO_REGISTER)
                        regmap_write(regmap, reg_addr->reg_offset_y, val);
                tsdata->offset_y = val;
        }
}

static void edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
{
        struct edt_reg_addr *reg_addr = &tsdata->reg_addr;
        struct regmap *regmap = tsdata->regmap;
        unsigned int val;

        regmap_read(regmap, reg_addr->reg_threshold, &tsdata->threshold);
        regmap_read(regmap, reg_addr->reg_gain, &tsdata->gain);
        if (reg_addr->reg_offset != NO_REGISTER)
                regmap_read(regmap, reg_addr->reg_offset, &tsdata->offset);
        if (reg_addr->reg_offset_x != NO_REGISTER)
                regmap_read(regmap, reg_addr->reg_offset_x, &tsdata->offset_x);
        if (reg_addr->reg_offset_y != NO_REGISTER)
                regmap_read(regmap, reg_addr->reg_offset_y, &tsdata->offset_y);
        if (reg_addr->reg_report_rate != NO_REGISTER)
                regmap_read(regmap, reg_addr->reg_report_rate,
                            &tsdata->report_rate);
        tsdata->num_x = EDT_DEFAULT_NUM_X;
        if (reg_addr->reg_num_x != NO_REGISTER) {
                if (!regmap_read(regmap, reg_addr->reg_num_x, &val))
                        tsdata->num_x = val;
        }
        tsdata->num_y = EDT_DEFAULT_NUM_Y;
        if (reg_addr->reg_num_y != NO_REGISTER) {
                if (!regmap_read(regmap, reg_addr->reg_num_y, &val))
                        tsdata->num_y = val;
        }
}

static void edt_ft5x06_ts_set_tdata_parameters(struct edt_ft5x06_ts_data *tsdata)
{
        int crclen;

        if (tsdata->version == EDT_M06) {
                tsdata->tdata_cmd = 0xf9;
                tsdata->tdata_offset = 5;
                tsdata->point_len = 4;
                crclen = 1;
        } else {
                tsdata->tdata_cmd = 0x0;
                tsdata->tdata_offset = 3;
                tsdata->point_len = 6;
                crclen = 0;
        }

        tsdata->tdata_len = tsdata->point_len * tsdata->max_support_points +
                tsdata->tdata_offset + crclen;
}

static void edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata)
{
        struct edt_reg_addr *reg_addr = &tsdata->reg_addr;

        switch (tsdata->version) {
        case EDT_M06:
                reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD;
                reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE;
                reg_addr->reg_gain = WORK_REGISTER_GAIN;
                reg_addr->reg_offset = WORK_REGISTER_OFFSET;
                reg_addr->reg_offset_x = NO_REGISTER;
                reg_addr->reg_offset_y = NO_REGISTER;
                reg_addr->reg_num_x = WORK_REGISTER_NUM_X;
                reg_addr->reg_num_y = WORK_REGISTER_NUM_Y;
                break;

        case EDT_M09:
        case EDT_M12:
                reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
                reg_addr->reg_report_rate = tsdata->version == EDT_M12 ?
                        M12_REGISTER_REPORT_RATE : NO_REGISTER;
                reg_addr->reg_gain = M09_REGISTER_GAIN;
                reg_addr->reg_offset = M09_REGISTER_OFFSET;
                reg_addr->reg_offset_x = NO_REGISTER;
                reg_addr->reg_offset_y = NO_REGISTER;
                reg_addr->reg_num_x = M09_REGISTER_NUM_X;
                reg_addr->reg_num_y = M09_REGISTER_NUM_Y;
                break;

        case EV_FT:
                reg_addr->reg_threshold = EV_REGISTER_THRESHOLD;
                reg_addr->reg_report_rate = NO_REGISTER;
                reg_addr->reg_gain = EV_REGISTER_GAIN;
                reg_addr->reg_offset = NO_REGISTER;
                reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X;
                reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y;
                reg_addr->reg_num_x = NO_REGISTER;
                reg_addr->reg_num_y = NO_REGISTER;
                break;

        case GENERIC_FT:
                /* this is a guesswork */
                reg_addr->reg_threshold = M09_REGISTER_THRESHOLD;
                reg_addr->reg_report_rate = NO_REGISTER;
                reg_addr->reg_gain = M09_REGISTER_GAIN;
                reg_addr->reg_offset = M09_REGISTER_OFFSET;
                reg_addr->reg_offset_x = NO_REGISTER;
                reg_addr->reg_offset_y = NO_REGISTER;
                reg_addr->reg_num_x = NO_REGISTER;
                reg_addr->reg_num_y = NO_REGISTER;
                break;
        }
}

static void edt_ft5x06_exit_regmap(void *arg)
{
        struct edt_ft5x06_ts_data *data = arg;

        if (!IS_ERR_OR_NULL(data->regmap))
                regmap_exit(data->regmap);
}

static void edt_ft5x06_disable_regulators(void *arg)
{
        struct edt_ft5x06_ts_data *data = arg;

        regulator_disable(data->vcc);
        regulator_disable(data->iovcc);
}

static int edt_ft5x06_ts_probe(struct i2c_client *client)
{
        const struct i2c_device_id *id = i2c_client_get_device_id(client);
        const struct edt_i2c_chip_data *chip_data;
        struct edt_ft5x06_ts_data *tsdata;
        unsigned int val;
        struct input_dev *input;
        unsigned long irq_flags;
        int error;
        u32 report_rate;

        dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n");

        tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
        if (!tsdata) {
                dev_err(&client->dev, "failed to allocate driver data.\n");
                return -ENOMEM;
        }

        tsdata->regmap = regmap_init_i2c(client, &edt_ft5x06_i2c_regmap_config);
        if (IS_ERR(tsdata->regmap)) {
                dev_err(&client->dev, "regmap allocation failed\n");
                return PTR_ERR(tsdata->regmap);
        }

        /*
         * We are not using devm_regmap_init_i2c() and instead install a
         * custom action because we may replace regmap with M06-specific one
         * and we need to make sure that it will not be released too early.
         */
        error = devm_add_action_or_reset(&client->dev, edt_ft5x06_exit_regmap,
                                         tsdata);
        if (error)
                return error;

        chip_data = device_get_match_data(&client->dev);
        if (!chip_data)
                chip_data = (const struct edt_i2c_chip_data *)id->driver_data;
        if (!chip_data || !chip_data->max_support_points) {
                dev_err(&client->dev, "invalid or missing chip data\n");
                return -EINVAL;
        }

        tsdata->max_support_points = chip_data->max_support_points;

        tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
        if (IS_ERR(tsdata->vcc))
                return dev_err_probe(&client->dev, PTR_ERR(tsdata->vcc),
                                     "failed to request regulator\n");

        tsdata->iovcc = devm_regulator_get(&client->dev, "iovcc");
        if (IS_ERR(tsdata->iovcc)) {
                error = PTR_ERR(tsdata->iovcc);
                if (error != -EPROBE_DEFER)
                        dev_err(&client->dev,
                                "failed to request iovcc regulator: %d\n", error);
                return error;
        }

        error = regulator_enable(tsdata->iovcc);
        if (error < 0) {
                dev_err(&client->dev, "failed to enable iovcc: %d\n", error);
                return error;
        }

        /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */
        usleep_range(10, 100);

        error = regulator_enable(tsdata->vcc);
        if (error < 0) {
                dev_err(&client->dev, "failed to enable vcc: %d\n", error);
                regulator_disable(tsdata->iovcc);
                return error;
        }

        error = devm_add_action_or_reset(&client->dev,
                                         edt_ft5x06_disable_regulators,
                                         tsdata);
        if (error)
                return error;

        tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
                                                     "reset", GPIOD_OUT_HIGH);
        if (IS_ERR(tsdata->reset_gpio)) {
                error = PTR_ERR(tsdata->reset_gpio);
                dev_err(&client->dev,
                        "Failed to request GPIO reset pin, error %d\n", error);
                return error;
        }

        tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev,
                                                    "wake", GPIOD_OUT_LOW);
        if (IS_ERR(tsdata->wake_gpio)) {
                error = PTR_ERR(tsdata->wake_gpio);
                dev_err(&client->dev,
                        "Failed to request GPIO wake pin, error %d\n", error);
                return error;
        }

        /*
         * Check which sleep modes we can support. Power-off requires the
         * reset-pin to ensure correct power-down/power-up behaviour. Start with
         * the EDT_PMODE_POWEROFF test since this is the deepest possible sleep
         * mode.
         */
        if (tsdata->reset_gpio)
                tsdata->suspend_mode = EDT_PMODE_POWEROFF;
        else if (tsdata->wake_gpio)
                tsdata->suspend_mode = EDT_PMODE_HIBERNATE;
        else
                tsdata->suspend_mode = EDT_PMODE_NOT_SUPPORTED;

        if (tsdata->wake_gpio) {
                usleep_range(5000, 6000);
                gpiod_set_value_cansleep(tsdata->wake_gpio, 1);
                usleep_range(5000, 6000);
        }

        if (tsdata->reset_gpio) {
                usleep_range(5000, 6000);
                gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
                msleep(300);
        }

        input = devm_input_allocate_device(&client->dev);
        if (!input) {
                dev_err(&client->dev, "failed to allocate input device.\n");
                return -ENOMEM;
        }

        mutex_init(&tsdata->mutex);
        tsdata->client = client;
        tsdata->input = input;
        tsdata->factory_mode = false;
        i2c_set_clientdata(client, tsdata);

        error = edt_ft5x06_ts_identify(client, tsdata);
        if (error) {
                dev_err(&client->dev, "touchscreen probe failed\n");
                return error;
        }

        /*
         * Dummy read access. EP0700MLP1 returns bogus data on the first
         * register read access and ignores writes.
         */
        regmap_read(tsdata->regmap, 0x00, &val);

        edt_ft5x06_ts_set_tdata_parameters(tsdata);
        edt_ft5x06_ts_set_regs(tsdata);
        edt_ft5x06_ts_get_defaults(&client->dev, tsdata);
        edt_ft5x06_ts_get_parameters(tsdata);

        if (tsdata->reg_addr.reg_report_rate != NO_REGISTER &&
            !device_property_read_u32(&client->dev,
                                      "report-rate-hz", &report_rate)) {
                if (tsdata->version == EDT_M06)
                        tsdata->report_rate = clamp_val(report_rate, 30, 140);
                else
                        tsdata->report_rate = clamp_val(report_rate, 1, 255);

                if (report_rate != tsdata->report_rate)
                        dev_warn(&client->dev,
                                 "report-rate %dHz is unsupported, use %dHz\n",
                                 report_rate, tsdata->report_rate);

                if (tsdata->version == EDT_M06)
                        tsdata->report_rate /= 10;

                regmap_write(tsdata->regmap, tsdata->reg_addr.reg_report_rate,
                             tsdata->report_rate);
        }

        dev_dbg(&client->dev,
                "Model \"%s\", Rev. \"%s\", %dx%d sensors\n",
                tsdata->name, tsdata->fw_version, tsdata->num_x, tsdata->num_y);

        input->name = tsdata->name;
        input->id.bustype = BUS_I2C;
        input->dev.parent = &client->dev;

        input_set_abs_params(input, ABS_MT_POSITION_X,
                             0, tsdata->num_x * 64 - 1, 0, 0);
        input_set_abs_params(input, ABS_MT_POSITION_Y,
                             0, tsdata->num_y * 64 - 1, 0, 0);

        touchscreen_parse_properties(input, true, &tsdata->prop);

        error = input_mt_init_slots(input, tsdata->max_support_points,
                                    INPUT_MT_DIRECT);
        if (error) {
                dev_err(&client->dev, "Unable to init MT slots.\n");
                return error;
        }

        irq_flags = irq_get_trigger_type(client->irq);
        if (irq_flags == IRQF_TRIGGER_NONE)
                irq_flags = IRQF_TRIGGER_FALLING;
        irq_flags |= IRQF_ONESHOT;

        error = devm_request_threaded_irq(&client->dev, client->irq,
                                          NULL, edt_ft5x06_ts_isr, irq_flags,
                                          client->name, tsdata);
        if (error) {
                dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
                return error;
        }

        error = input_register_device(input);
        if (error)
                return error;

        edt_ft5x06_ts_prepare_debugfs(tsdata);

        dev_dbg(&client->dev,
                "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n",
                client->irq,
                tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1,
                tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);

        return 0;
}

static void edt_ft5x06_ts_remove(struct i2c_client *client)
{
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

        edt_ft5x06_ts_teardown_debugfs(tsdata);
}

static int edt_ft5x06_ts_suspend(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
        struct gpio_desc *reset_gpio = tsdata->reset_gpio;
        int ret;

        if (device_may_wakeup(dev))
                return 0;

        if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
                return 0;

        /* Enter hibernate mode. */
        ret = regmap_write(tsdata->regmap, PMOD_REGISTER_OPMODE,
                           PMOD_REGISTER_HIBERNATE);
        if (ret)
                dev_warn(dev, "Failed to set hibernate mode\n");

        if (tsdata->suspend_mode == EDT_PMODE_HIBERNATE)
                return 0;

        /*
         * Power-off according the datasheet. Cut the power may leaf the irq
         * line in an undefined state depending on the host pull resistor
         * settings. Disable the irq to avoid adjusting each host till the
         * device is back in a full functional state.
         */
        disable_irq(tsdata->client->irq);

        gpiod_set_value_cansleep(reset_gpio, 1);
        usleep_range(1000, 2000);

        ret = regulator_disable(tsdata->vcc);
        if (ret)
                dev_warn(dev, "Failed to disable vcc\n");
        ret = regulator_disable(tsdata->iovcc);
        if (ret)
                dev_warn(dev, "Failed to disable iovcc\n");

        return 0;
}

static int edt_ft5x06_ts_resume(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
        int ret = 0;

        if (device_may_wakeup(dev))
                return 0;

        if (tsdata->suspend_mode == EDT_PMODE_NOT_SUPPORTED)
                return 0;

        if (tsdata->suspend_mode == EDT_PMODE_POWEROFF) {
                struct gpio_desc *reset_gpio = tsdata->reset_gpio;

                /*
                 * We can't check if the regulator is a dummy or a real
                 * regulator. So we need to specify the 5ms reset time (T_rst)
                 * here instead of the 100us T_rtp time. We also need to wait
                 * 300ms in case it was a real supply and the power was cutted
                 * of. Toggle the reset pin is also a way to exit the hibernate
                 * mode.
                 */
                gpiod_set_value_cansleep(reset_gpio, 1);
                usleep_range(5000, 6000);

                ret = regulator_enable(tsdata->iovcc);
                if (ret) {
                        dev_err(dev, "Failed to enable iovcc\n");
                        return ret;
                }

                /* Delay enabling VCC for > 10us (T_ivd) after IOVCC */
                usleep_range(10, 100);

                ret = regulator_enable(tsdata->vcc);
                if (ret) {
                        dev_err(dev, "Failed to enable vcc\n");
                        regulator_disable(tsdata->iovcc);
                        return ret;
                }

                usleep_range(1000, 2000);
                gpiod_set_value_cansleep(reset_gpio, 0);
                msleep(300);

                edt_ft5x06_restore_reg_parameters(tsdata);
                enable_irq(tsdata->client->irq);

                if (tsdata->factory_mode)
                        ret = edt_ft5x06_factory_mode(tsdata);
        } else {
                struct gpio_desc *wake_gpio = tsdata->wake_gpio;

                gpiod_set_value_cansleep(wake_gpio, 0);
                usleep_range(5000, 6000);
                gpiod_set_value_cansleep(wake_gpio, 1);
        }

        return ret;
}

static DEFINE_SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
                                edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);

static const struct edt_i2c_chip_data edt_ft5x06_data = {
        .max_support_points = 5,
};

static const struct edt_i2c_chip_data edt_ft3518_data = {
        .max_support_points = 10,
};

static const struct edt_i2c_chip_data edt_ft5452_data = {
        .max_support_points = 5,
};

static const struct edt_i2c_chip_data edt_ft5506_data = {
        .max_support_points = 10,
};

static const struct edt_i2c_chip_data edt_ft6236_data = {
        .max_support_points = 2,
};

static const struct edt_i2c_chip_data edt_ft8201_data = {
        .max_support_points = 10,
};

static const struct edt_i2c_chip_data edt_ft8716_data = {
        .max_support_points = 10,
};

static const struct edt_i2c_chip_data edt_ft8719_data = {
        .max_support_points = 10,
};

static const struct i2c_device_id edt_ft5x06_ts_id[] = {
        { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data },
        { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data },
        { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data },
        { .name = "ft3518", .driver_data = (long)&edt_ft3518_data },
        { .name = "ft5452", .driver_data = (long)&edt_ft5452_data },
        /* Note no edt- prefix for compatibility with the ft6236.c driver */
        { .name = "ft6236", .driver_data = (long)&edt_ft6236_data },
        { .name = "ft8201", .driver_data = (long)&edt_ft8201_data },
        { .name = "ft8716", .driver_data = (long)&edt_ft8716_data },
        { .name = "ft8719", .driver_data = (long)&edt_ft8719_data },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);

static const struct of_device_id edt_ft5x06_of_match[] = {
        { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data },
        { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data },
        { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data },
        { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data },
        { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data },
        { .compatible = "focaltech,ft3518", .data = &edt_ft3518_data },
        { .compatible = "focaltech,ft5426", .data = &edt_ft5506_data },
        { .compatible = "focaltech,ft5452", .data = &edt_ft5452_data },
        /* Note focaltech vendor prefix for compatibility with ft6236.c */
        { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data },
        { .compatible = "focaltech,ft8201", .data = &edt_ft8201_data },
        { .compatible = "focaltech,ft8716", .data = &edt_ft8716_data },
        { .compatible = "focaltech,ft8719", .data = &edt_ft8719_data },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match);

static struct i2c_driver edt_ft5x06_ts_driver = {
        .driver = {
                .name = "edt_ft5x06",
                .dev_groups = edt_ft5x06_groups,
                .of_match_table = edt_ft5x06_of_match,
                .pm = pm_sleep_ptr(&edt_ft5x06_ts_pm_ops),
                .probe_type = PROBE_PREFER_ASYNCHRONOUS,
        },
        .id_table = edt_ft5x06_ts_id,
        .probe    = edt_ft5x06_ts_probe,
        .remove   = edt_ft5x06_ts_remove,
};

module_i2c_driver(edt_ft5x06_ts_driver);

MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>");
MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
MODULE_LICENSE("GPL v2");