edt-ft5x06.c

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/*
 * Copyright (C) 2012 Simon Budig, <[email protected]>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * 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/module.h>
#include <linux/ratelimit.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/uaccess.h>
#include <linux/delay.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/input/mt.h>
#include <linux/input/edt-ft5x06.h>

#define MAX_SUPPORT_POINTS      5

#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 WORK_REGISTER_OPMODE        0x3c
#define FACTORY_REGISTER_OPMODE     0x01

#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      1 /* msec */

struct edt_ft5x06_ts_data {
    struct i2c_client *client;
    struct input_dev *input;
    u16 num_x;
    u16 num_y;

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

    struct mutex mutex;
    bool factory_mode;
    int threshold;
    int gain;
    int offset;
    int report_rate;

    char name[EDT_NAME_LEN];
};

static int edt_ft5x06_ts_readwrite(struct i2c_client *client,
                   u16 wr_len, u8 *wr_buf,
                   u16 rd_len, u8 *rd_buf)
{
    struct i2c_msg wrmsg[2];
    int i = 0;
    int ret;

    if (wr_len) {
        wrmsg[i].addr  = client->addr;
        wrmsg[i].flags = 0;
        wrmsg[i].len = wr_len;
        wrmsg[i].buf = wr_buf;
        i++;
    }
    if (rd_len) {
        wrmsg[i].addr  = client->addr;
        wrmsg[i].flags = I2C_M_RD;
        wrmsg[i].len = rd_len;
        wrmsg[i].buf = rd_buf;
        i++;
    }

    ret = i2c_transfer(client->adapter, wrmsg, i);
    if (ret < 0)
        return ret;
    if (ret != i)
        return -EIO;

    return 0;
}

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

    return true;
}

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 cmd = 0xf9;
    u8 rdbuf[26];
    int i, type, x, y, id;
    int error;

    memset(rdbuf, 0, sizeof(rdbuf));

    error = edt_ft5x06_ts_readwrite(tsdata->client,
                    sizeof(cmd), &cmd,
                    sizeof(rdbuf), rdbuf);
    if (error) {
        dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
                    error);
        goto out;
    }

    if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || rdbuf[2] != 26) {
        dev_err_ratelimited(dev, "Unexpected header: %02x%02x%02x!\n",
                    rdbuf[0], rdbuf[1], rdbuf[2]);
        goto out;
    }

    if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, 26))
        goto out;

    for (i = 0; i < MAX_SUPPORT_POINTS; i++) {
        u8 *buf = &rdbuf[i * 4 + 5];
        bool down;

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

        x = ((buf[0] << 8) | buf[1]) & 0x0fff;
        y = ((buf[2] << 8) | buf[3]) & 0x0fff;
        id = (buf[2] >> 4) & 0x0f;
        down = (type != TOUCH_EVENT_UP);

        input_mt_slot(tsdata->input, id);
        input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down);

        if (!down)
            continue;

        input_report_abs(tsdata->input, ABS_MT_POSITION_X, x);
        input_report_abs(tsdata->input, ABS_MT_POSITION_Y, y);
    }

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

out:
    return IRQ_HANDLED;
}

static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
                     u8 addr, u8 value)
{
    u8 wrbuf[4];

    wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
    wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
    wrbuf[2] = value;
    wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2];

    return edt_ft5x06_ts_readwrite(tsdata->client, 4, wrbuf, 0, NULL);
}

static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata,
                    u8 addr)
{
    u8 wrbuf[2], rdbuf[2];
    int error;

    wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc;
    wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f;
    wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40;

    error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2, rdbuf);
    if (error)
        return error;

    if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) {
        dev_err(&tsdata->client->dev,
            "crc error: 0x%02x expected, got 0x%02x\n",
            wrbuf[0] ^ wrbuf[1] ^ rdbuf[0], rdbuf[1]);
        return -EIO;
    }

    return rdbuf[0];
}

struct edt_ft5x06_attribute {
    struct device_attribute dattr;
    size_t field_offset;
    u8 limit_low;
    u8 limit_high;
    u8 addr;
};

#define EDT_ATTR(_field, _mode, _addr, _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),    \
        .limit_low = _limit_low,                \
        .limit_high = _limit_high,              \
        .addr = _addr,                      \
    }

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 *)((char *)tsdata + attr->field_offset);
    int val;
    size_t count = 0;
    int error = 0;

    mutex_lock(&tsdata->mutex);

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

    val = edt_ft5x06_register_read(tsdata, attr->addr);
    if (val < 0) {
        error = val;
        dev_err(&tsdata->client->dev,
            "Failed to fetch attribute %s, error %d\n",
            dattr->attr.name, error);
        goto out;
    }

    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 = scnprintf(buf, PAGE_SIZE, "%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 *)((char *)tsdata + attr->field_offset);
    unsigned int val;
    int error;

    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;
    }

    error = edt_ft5x06_register_write(tsdata, attr->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;
}

static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, 0, 31);
static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, 0, 31);
static EDT_ATTR(threshold, S_IWUSR | S_IRUGO,
        WORK_REGISTER_THRESHOLD, 20, 80);
static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO,
        WORK_REGISTER_REPORT_RATE, 3, 14);

static struct attribute *edt_ft5x06_attrs[] = {
    &edt_ft5x06_attr_gain.dattr.attr,
    &edt_ft5x06_attr_offset.dattr.attr,
    &edt_ft5x06_attr_threshold.dattr.attr,
    &edt_ft5x06_attr_report_rate.dattr.attr,
    NULL
};

static const struct attribute_group edt_ft5x06_attr_group = {
    .attrs = edt_ft5x06_attrs,
};

#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;
    int ret;
    int error;

    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 = edt_ft5x06_register_write(tsdata, 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 */
        ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE);
        if (ret == 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;
    int ret;
    int error;

    /* mode register is 0x01 when in the factory mode */
    error = edt_ft5x06_register_write(tsdata, 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 */
        ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE);
        if (ret == 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;
    }

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

    /* restore parameters */
    edt_ft5x06_register_write(tsdata, WORK_REGISTER_THRESHOLD,
                  tsdata->threshold);
    edt_ft5x06_register_write(tsdata, WORK_REGISTER_GAIN,
                  tsdata->gain);
    edt_ft5x06_register_write(tsdata, WORK_REGISTER_OFFSET,
                  tsdata->offset);
    edt_ft5x06_register_write(tsdata, WORK_REGISTER_REPORT_RATE,
                  tsdata->report_rate);

    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 int edt_ft5x06_debugfs_raw_data_open(struct inode *inode,
                        struct file *file)
{
    file->private_data = inode->i_private;

    return 0;
}

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;
    int val, i, error;
    size_t read = 0;
    int colbytes;
    char wrbuf[3];
    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 = edt_ft5x06_register_write(tsdata, 0x08, 0x01);
    if (error) {
        dev_dbg(&client->dev,
            "failed to write 0x08 register, error %d\n", error);
        goto out;
    }

    do {
        msleep(EDT_RAW_DATA_DELAY);
        val = edt_ft5x06_register_read(tsdata, 0x08);
        if (val < 1)
            break;
    } while (--retries > 0);

    if (val < 0) {
        error = val;
        dev_dbg(&client->dev,
            "failed to read 0x08 register, error %d\n", error);
        goto out;
    }

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

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

    wrbuf[0] = 0xf5;
    wrbuf[1] = 0x0e;
    for (i = 0; i < tsdata->num_x; i++) {
        wrbuf[2] = i;  /* column index */
        error = edt_ft5x06_ts_readwrite(tsdata->client,
                        sizeof(wrbuf), wrbuf,
                        colbytes, rdbuf);
        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 = edt_ft5x06_debugfs_raw_data_open,
    .read = edt_ft5x06_debugfs_raw_data_read,
};

static void __devinit
edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
                  const char *debugfs_name)
{
    tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL);
    if (!tsdata->debug_dir)
        return;

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

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

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

#else

static inline void
edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata,
                  const char *debugfs_name)
{
}

static inline void
edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata)
{
}

#endif /* CONFIG_DEBUGFS */



static int __devinit edt_ft5x06_ts_reset(struct i2c_client *client,
                     int reset_pin)
{
    int error;

    if (gpio_is_valid(reset_pin)) {
        /* this pulls reset down, enabling the low active reset */
        error = gpio_request_one(reset_pin, GPIOF_OUT_INIT_LOW,
                     "edt-ft5x06 reset");
        if (error) {
            dev_err(&client->dev,
                "Failed to request GPIO %d as reset pin, error %d\n",
                reset_pin, error);
            return error;
        }

        mdelay(50);
        gpio_set_value(reset_pin, 1);
        mdelay(100);
    }

    return 0;
}

static int __devinit edt_ft5x06_ts_identify(struct i2c_client *client,
                        char *model_name,
                        char *fw_version)
{
    u8 rdbuf[EDT_NAME_LEN];
    char *p;
    int error;

    error = edt_ft5x06_ts_readwrite(client, 1, "\xbb",
                    EDT_NAME_LEN - 1, rdbuf);
    if (error)
        return error;

    /* 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';

    strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN);
    strlcpy(fw_version, p ? p : "", EDT_NAME_LEN);

    return 0;
}

#define EDT_ATTR_CHECKSET(name, reg) \
    if (pdata->name >= edt_ft5x06_attr_##name.limit_low &&      \
        pdata->name <= edt_ft5x06_attr_##name.limit_high)       \
        edt_ft5x06_register_write(tsdata, reg, pdata->name)

static void __devinit
edt_ft5x06_ts_get_defaults(struct edt_ft5x06_ts_data *tsdata,
               const struct edt_ft5x06_platform_data *pdata)
{
    if (!pdata->use_parameters)
        return;

    /* pick up defaults from the platform data */
    EDT_ATTR_CHECKSET(threshold, WORK_REGISTER_THRESHOLD);
    EDT_ATTR_CHECKSET(gain, WORK_REGISTER_GAIN);
    EDT_ATTR_CHECKSET(offset, WORK_REGISTER_OFFSET);
    EDT_ATTR_CHECKSET(report_rate, WORK_REGISTER_REPORT_RATE);
}

static void __devinit
edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
{
    tsdata->threshold = edt_ft5x06_register_read(tsdata,
                             WORK_REGISTER_THRESHOLD);
    tsdata->gain = edt_ft5x06_register_read(tsdata, WORK_REGISTER_GAIN);
    tsdata->offset = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OFFSET);
    tsdata->report_rate = edt_ft5x06_register_read(tsdata,
                        WORK_REGISTER_REPORT_RATE);
    tsdata->num_x = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_X);
    tsdata->num_y = edt_ft5x06_register_read(tsdata, WORK_REGISTER_NUM_Y);
}

static int __devinit edt_ft5x06_ts_probe(struct i2c_client *client,
                     const struct i2c_device_id *id)
{
    const struct edt_ft5x06_platform_data *pdata =
                        client->dev.platform_data;
    struct edt_ft5x06_ts_data *tsdata;
    struct input_dev *input;
    int error;
    char fw_version[EDT_NAME_LEN];

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

    if (!pdata) {
        dev_err(&client->dev, "no platform data?\n");
        return -EINVAL;
    }

    error = edt_ft5x06_ts_reset(client, pdata->reset_pin);
    if (error)
        return error;

    if (gpio_is_valid(pdata->irq_pin)) {
        error = gpio_request_one(pdata->irq_pin,
                     GPIOF_IN, "edt-ft5x06 irq");
        if (error) {
            dev_err(&client->dev,
                "Failed to request GPIO %d, error %d\n",
                pdata->irq_pin, error);
            return error;
        }
    }

    tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
    input = input_allocate_device();
    if (!tsdata || !input) {
        dev_err(&client->dev, "failed to allocate driver data.\n");
        error = -ENOMEM;
        goto err_free_mem;
    }

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

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

    edt_ft5x06_ts_get_defaults(tsdata, pdata);
    edt_ft5x06_ts_get_parameters(tsdata);

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

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

    __set_bit(EV_SYN, input->evbit);
    __set_bit(EV_KEY, input->evbit);
    __set_bit(EV_ABS, input->evbit);
    __set_bit(BTN_TOUCH, input->keybit);
    input_set_abs_params(input, ABS_X, 0, tsdata->num_x * 64 - 1, 0, 0);
    input_set_abs_params(input, ABS_Y, 0, tsdata->num_y * 64 - 1, 0, 0);
    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);
    error = input_mt_init_slots(input, MAX_SUPPORT_POINTS, 0);
    if (error) {
        dev_err(&client->dev, "Unable to init MT slots.\n");
        goto err_free_mem;
    }

    input_set_drvdata(input, tsdata);
    i2c_set_clientdata(client, tsdata);

    error = request_threaded_irq(client->irq, NULL, edt_ft5x06_ts_isr,
                     IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
                     client->name, tsdata);
    if (error) {
        dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
        goto err_free_mem;
    }

    error = sysfs_create_group(&client->dev.kobj, &edt_ft5x06_attr_group);
    if (error)
        goto err_free_irq;

    error = input_register_device(input);
    if (error)
        goto err_remove_attrs;

    edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev));
    device_init_wakeup(&client->dev, 1);

    dev_dbg(&client->dev,
        "EDT FT5x06 initialized: IRQ pin %d, Reset pin %d.\n",
        pdata->irq_pin, pdata->reset_pin);

    return 0;

err_remove_attrs:
    sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);
err_free_irq:
    free_irq(client->irq, tsdata);
err_free_mem:
    input_free_device(input);
    kfree(tsdata);

    if (gpio_is_valid(pdata->irq_pin))
        gpio_free(pdata->irq_pin);

    return error;
}

static int __devexit edt_ft5x06_ts_remove(struct i2c_client *client)
{
    const struct edt_ft5x06_platform_data *pdata =
                        dev_get_platdata(&client->dev);
    struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

    edt_ft5x06_ts_teardown_debugfs(tsdata);
    sysfs_remove_group(&client->dev.kobj, &edt_ft5x06_attr_group);

    free_irq(client->irq, tsdata);
    input_unregister_device(tsdata->input);

    if (gpio_is_valid(pdata->irq_pin))
        gpio_free(pdata->irq_pin);
    if (gpio_is_valid(pdata->reset_pin))
        gpio_free(pdata->reset_pin);

    kfree(tsdata);

    return 0;
}

#ifdef CONFIG_PM_SLEEP
static int edt_ft5x06_ts_suspend(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);

    if (device_may_wakeup(dev))
        enable_irq_wake(client->irq);

    return 0;
}

static int edt_ft5x06_ts_resume(struct device *dev)
{
    struct i2c_client *client = to_i2c_client(dev);

    if (device_may_wakeup(dev))
        disable_irq_wake(client->irq);

    return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops,
             edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume);

static const struct i2c_device_id edt_ft5x06_ts_id[] = {
    { "edt-ft5x06", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id);

static struct i2c_driver edt_ft5x06_ts_driver = {
    .driver = {
        .owner = THIS_MODULE,
        .name = "edt_ft5x06",
        .pm = &edt_ft5x06_ts_pm_ops,
    },
    .id_table = edt_ft5x06_ts_id,
    .probe    = edt_ft5x06_ts_probe,
    .remove   = __devexit_p(edt_ft5x06_ts_remove),
};

module_i2c_driver(edt_ft5x06_ts_driver);

MODULE_AUTHOR("Simon Budig <[email protected]>");
MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver");
MODULE_LICENSE("GPL");