// SPDX-License-Identifier: GPL-2.0-or-later
/* -------------------------------------------------------------------------
 * Copyright (C) 2014-2015, Intel Corporation
 *
 * Derived from:
 *  gslX68X.c
 *  Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
 *
 * -------------------------------------------------------------------------
 */

#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/irq.h>
#include <linux/regulator/consumer.h>

#include <linux/unaligned.h>

#define SILEAD_TS_NAME          "silead_ts"

#define SILEAD_REG_RESET        0xE0
#define SILEAD_REG_DATA         0x80
#define SILEAD_REG_TOUCH_NR     0x80
#define SILEAD_REG_POWER        0xBC
#define SILEAD_REG_CLOCK        0xE4
#define SILEAD_REG_STATUS       0xB0
#define SILEAD_REG_ID           0xFC
#define SILEAD_REG_MEM_CHECK    0xB0

#define SILEAD_STATUS_OK        0x5A5A5A5A
#define SILEAD_TS_DATA_LEN      44
#define SILEAD_CLOCK            0x04

#define SILEAD_CMD_RESET        0x88
#define SILEAD_CMD_START        0x00

#define SILEAD_POINT_DATA_LEN   0x04
#define SILEAD_POINT_Y_OFF      0x00
#define SILEAD_POINT_Y_MSB_OFF  0x01
#define SILEAD_POINT_X_OFF      0x02
#define SILEAD_POINT_X_MSB_OFF  0x03
#define SILEAD_EXTRA_DATA_MASK  0xF0

#define SILEAD_CMD_SLEEP_MIN    10000
#define SILEAD_CMD_SLEEP_MAX    20000
#define SILEAD_POWER_SLEEP      20
#define SILEAD_STARTUP_SLEEP    30

#define SILEAD_MAX_FINGERS      10

enum silead_ts_power {
        SILEAD_POWER_ON  = 1,
        SILEAD_POWER_OFF = 0
};

struct silead_ts_data {
        struct i2c_client *client;
        struct gpio_desc *gpio_power;
        struct input_dev *input;
        struct input_dev *pen_input;
        struct regulator_bulk_data regulators[2];
        char fw_name[64];
        struct touchscreen_properties prop;
        u32 chip_id;
        struct input_mt_pos pos[SILEAD_MAX_FINGERS];
        int slots[SILEAD_MAX_FINGERS];
        int id[SILEAD_MAX_FINGERS];
        u32 efi_fw_min_max[4];
        bool efi_fw_min_max_set;
        bool pen_supported;
        bool pen_down;
        u32 pen_x_res;
        u32 pen_y_res;
        int pen_up_count;
};

struct silead_fw_data {
        u32 offset;
        u32 val;
};

static void silead_apply_efi_fw_min_max(struct silead_ts_data *data)
{
        struct input_absinfo *absinfo_x = &data->input->absinfo[ABS_MT_POSITION_X];
        struct input_absinfo *absinfo_y = &data->input->absinfo[ABS_MT_POSITION_Y];

        if (!data->efi_fw_min_max_set)
                return;

        absinfo_x->minimum = data->efi_fw_min_max[0];
        absinfo_x->maximum = data->efi_fw_min_max[1];
        absinfo_y->minimum = data->efi_fw_min_max[2];
        absinfo_y->maximum = data->efi_fw_min_max[3];

        if (data->prop.invert_x) {
                absinfo_x->maximum -= absinfo_x->minimum;
                absinfo_x->minimum = 0;
        }

        if (data->prop.invert_y) {
                absinfo_y->maximum -= absinfo_y->minimum;
                absinfo_y->minimum = 0;
        }

        if (data->prop.swap_x_y) {
                swap(absinfo_x->minimum, absinfo_y->minimum);
                swap(absinfo_x->maximum, absinfo_y->maximum);
        }
}

static int silead_ts_request_input_dev(struct silead_ts_data *data)
{
        struct device *dev = &data->client->dev;
        int error;

        data->input = devm_input_allocate_device(dev);
        if (!data->input) {
                dev_err(dev,
                        "Failed to allocate input device\n");
                return -ENOMEM;
        }

        input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
        input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
        touchscreen_parse_properties(data->input, true, &data->prop);
        silead_apply_efi_fw_min_max(data);

        input_mt_init_slots(data->input, SILEAD_MAX_FINGERS,
                            INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
                            INPUT_MT_TRACK);

        if (device_property_read_bool(dev, "silead,home-button"))
                input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);

        data->input->name = SILEAD_TS_NAME;
        data->input->phys = "input/ts";
        data->input->id.bustype = BUS_I2C;

        error = input_register_device(data->input);
        if (error) {
                dev_err(dev, "Failed to register input device: %d\n", error);
                        return error;
        }

        return 0;
}

static int silead_ts_request_pen_input_dev(struct silead_ts_data *data)
{
        struct device *dev = &data->client->dev;
        int error;

        if (!data->pen_supported)
                return 0;

        data->pen_input = devm_input_allocate_device(dev);
        if (!data->pen_input)
                return -ENOMEM;

        input_set_abs_params(data->pen_input, ABS_X, 0, 4095, 0, 0);
        input_set_abs_params(data->pen_input, ABS_Y, 0, 4095, 0, 0);
        input_set_capability(data->pen_input, EV_KEY, BTN_TOUCH);
        input_set_capability(data->pen_input, EV_KEY, BTN_TOOL_PEN);
        set_bit(INPUT_PROP_DIRECT, data->pen_input->propbit);
        touchscreen_parse_properties(data->pen_input, false, &data->prop);
        input_abs_set_res(data->pen_input, ABS_X, data->pen_x_res);
        input_abs_set_res(data->pen_input, ABS_Y, data->pen_y_res);

        data->pen_input->name = SILEAD_TS_NAME " pen";
        data->pen_input->phys = "input/pen";
        data->input->id.bustype = BUS_I2C;

        error = input_register_device(data->pen_input);
        if (error) {
                dev_err(dev, "Failed to register pen input device: %d\n", error);
                return error;
        }

        return 0;
}

static void silead_ts_set_power(struct i2c_client *client,
                                enum silead_ts_power state)
{
        struct silead_ts_data *data = i2c_get_clientdata(client);

        if (data->gpio_power) {
                gpiod_set_value_cansleep(data->gpio_power, state);
                msleep(SILEAD_POWER_SLEEP);
        }
}

static bool silead_ts_handle_pen_data(struct silead_ts_data *data, u8 *buf)
{
        u8 *coord = buf + SILEAD_POINT_DATA_LEN;
        struct input_mt_pos pos;

        if (!data->pen_supported || buf[2] != 0x00 || buf[3] != 0x00)
                return false;

        if (buf[0] == 0x00 && buf[1] == 0x00 && data->pen_down) {
                data->pen_up_count++;
                if (data->pen_up_count == 6) {
                        data->pen_down = false;
                        goto sync;
                }
                return true;
        }

        if (buf[0] == 0x01 && buf[1] == 0x08) {
                touchscreen_set_mt_pos(&pos, &data->prop,
                        get_unaligned_le16(&coord[SILEAD_POINT_X_OFF]) & 0xfff,
                        get_unaligned_le16(&coord[SILEAD_POINT_Y_OFF]) & 0xfff);

                input_report_abs(data->pen_input, ABS_X, pos.x);
                input_report_abs(data->pen_input, ABS_Y, pos.y);

                data->pen_up_count = 0;
                data->pen_down = true;
                goto sync;
        }

        return false;

sync:
        input_report_key(data->pen_input, BTN_TOOL_PEN, data->pen_down);
        input_report_key(data->pen_input, BTN_TOUCH, data->pen_down);
        input_sync(data->pen_input);
        return true;
}

static void silead_ts_read_data(struct i2c_client *client)
{
        struct silead_ts_data *data = i2c_get_clientdata(client);
        struct input_dev *input = data->input;
        struct device *dev = &client->dev;
        u8 *bufp, buf[SILEAD_TS_DATA_LEN];
        int touch_nr, softbutton, error, i;
        bool softbutton_pressed = false;

        error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
                                              SILEAD_TS_DATA_LEN, buf);
        if (error < 0) {
                dev_err(dev, "Data read error %d\n", error);
                return;
        }

        if (buf[0] > SILEAD_MAX_FINGERS) {
                dev_warn(dev, "More touches reported then supported %d > %d\n",
                         buf[0], SILEAD_MAX_FINGERS);
                buf[0] = SILEAD_MAX_FINGERS;
        }

        if (silead_ts_handle_pen_data(data, buf))
                goto sync; /* Pen is down, release all previous touches */

        touch_nr = 0;
        bufp = buf + SILEAD_POINT_DATA_LEN;
        for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
                softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
                              SILEAD_EXTRA_DATA_MASK) >> 4;

                if (softbutton) {
                        /*
                         * For now only respond to softbutton == 0x01, some
                         * tablets *without* a capacative button send 0x04
                         * when crossing the edges of the screen.
                         */
                        if (softbutton == 0x01)
                                softbutton_pressed = true;

                        continue;
                }

                /*
                 * Bits 4-7 are the touch id, note not all models have
                 * hardware touch ids so atm we don't use these.
                 */
                data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
                                      SILEAD_EXTRA_DATA_MASK) >> 4;
                touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
                        get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
                        get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
                touch_nr++;
        }

        input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);

        for (i = 0; i < touch_nr; i++) {
                input_mt_slot(input, data->slots[i]);
                input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
                input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
                input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);

                dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
                        data->pos[i].y, data->id[i], data->slots[i]);
        }

sync:
        input_mt_sync_frame(input);
        input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
        input_sync(input);
}

static int silead_ts_init(struct i2c_client *client)
{
        int error;

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
                                          SILEAD_CMD_RESET);
        if (error)
                goto i2c_write_err;
        usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
                                          SILEAD_MAX_FINGERS);
        if (error)
                goto i2c_write_err;
        usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
                                          SILEAD_CLOCK);
        if (error)
                goto i2c_write_err;
        usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
                                          SILEAD_CMD_START);
        if (error)
                goto i2c_write_err;
        usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

        return 0;

i2c_write_err:
        dev_err(&client->dev, "Registers clear error %d\n", error);
        return error;
}

static int silead_ts_reset(struct i2c_client *client)
{
        int error;

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
                                          SILEAD_CMD_RESET);
        if (error)
                goto i2c_write_err;
        usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
                                          SILEAD_CLOCK);
        if (error)
                goto i2c_write_err;
        usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
                                          SILEAD_CMD_START);
        if (error)
                goto i2c_write_err;
        usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);

        return 0;

i2c_write_err:
        dev_err(&client->dev, "Chip reset error %d\n", error);
        return error;
}

static int silead_ts_startup(struct i2c_client *client)
{
        int error;

        error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
        if (error) {
                dev_err(&client->dev, "Startup error %d\n", error);
                return error;
        }

        msleep(SILEAD_STARTUP_SLEEP);

        return 0;
}

static int silead_ts_load_fw(struct i2c_client *client)
{
        struct device *dev = &client->dev;
        struct silead_ts_data *data = i2c_get_clientdata(client);
        const struct firmware *fw = NULL;
        struct silead_fw_data *fw_data;
        unsigned int fw_size, i;
        int error;

        dev_dbg(dev, "Firmware file name: %s", data->fw_name);

        /*
         * Unfortunately, at the time of writing this comment, we have been unable to
         * get permission from Silead, or from device OEMs, to distribute the necessary
         * Silead firmware files in linux-firmware.
         *
         * On a whole bunch of devices the UEFI BIOS code contains a touchscreen driver,
         * which contains an embedded copy of the firmware. The fw-loader code has a
         * "platform" fallback mechanism, which together with info on the firmware
         * from drivers/platform/x86/touchscreen_dmi.c will use the firmware from the
         * UEFI driver when the firmware is missing from /lib/firmware. This makes the
         * touchscreen work OOTB without users needing to manually download the firmware.
         *
         * The firmware bundled with the original Windows/Android is usually newer then
         * the firmware in the UEFI driver and it is better calibrated. This better
         * calibration can lead to significant differences in the reported min/max
         * coordinates.
         *
         * To deal with this we first try to load the firmware without "platform"
         * fallback. If that fails we retry with "platform" fallback and if that
         * succeeds we apply an (optional) set of alternative min/max values from the
         * "silead,efi-fw-min-max" property.
         */
        error = firmware_request_nowarn(&fw, data->fw_name, dev);
        if (error) {
                error = firmware_request_platform(&fw, data->fw_name, dev);
                if (error) {
                        dev_err(dev, "Firmware request error %d\n", error);
                        return error;
                }

                error = device_property_read_u32_array(dev, "silead,efi-fw-min-max",
                                                       data->efi_fw_min_max,
                                                       ARRAY_SIZE(data->efi_fw_min_max));
                if (!error)
                        data->efi_fw_min_max_set = true;

                /* The EFI (platform) embedded fw does not have pen support */
                if (data->pen_supported) {
                        dev_warn(dev, "Warning loading '%s' from filesystem failed, using EFI embedded copy.\n",
                                 data->fw_name);
                        dev_warn(dev, "Warning pen support is known to be broken in the EFI embedded fw version\n");
                        data->pen_supported = false;
                }
        }

        fw_size = fw->size / sizeof(*fw_data);
        fw_data = (struct silead_fw_data *)fw->data;

        for (i = 0; i < fw_size; i++) {
                error = i2c_smbus_write_i2c_block_data(client,
                                                       fw_data[i].offset,
                                                       4,
                                                       (u8 *)&fw_data[i].val);
                if (error) {
                        dev_err(dev, "Firmware load error %d\n", error);
                        break;
                }
        }

        release_firmware(fw);
        return error ?: 0;
}

static u32 silead_ts_get_status(struct i2c_client *client)
{
        int error;
        __le32 status;

        error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
                                              sizeof(status), (u8 *)&status);
        if (error < 0) {
                dev_err(&client->dev, "Status read error %d\n", error);
                return error;
        }

        return le32_to_cpu(status);
}

static int silead_ts_get_id(struct i2c_client *client)
{
        struct silead_ts_data *data = i2c_get_clientdata(client);
        __le32 chip_id;
        int error;

        error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
                                              sizeof(chip_id), (u8 *)&chip_id);
        if (error < 0)
                return error;

        data->chip_id = le32_to_cpu(chip_id);
        dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);

        return 0;
}

static int silead_ts_setup(struct i2c_client *client)
{
        int error;
        u32 status;

        /*
         * Some buggy BIOS-es bring up the chip in a stuck state where it
         * blocks the I2C bus. The following steps are necessary to
         * unstuck the chip / bus:
         * 1. Turn off the Silead chip.
         * 2. Try to do an I2C transfer with the chip, this will fail in
         *    response to which the I2C-bus-driver will call:
         *    i2c_recover_bus() which will unstuck the I2C-bus. Note the
         *    unstuck-ing of the I2C bus only works if we first drop the
         *    chip off the bus by turning it off.
         * 3. Turn the chip back on.
         *
         * On the x86/ACPI systems were this problem is seen, step 1. and
         * 3. require making ACPI calls and dealing with ACPI Power
         * Resources. The workaround below runtime-suspends the chip to
         * turn it off, leaving it up to the ACPI subsystem to deal with
         * this.
         */

        if (device_property_read_bool(&client->dev,
                                      "silead,stuck-controller-bug")) {
                pm_runtime_set_active(&client->dev);
                pm_runtime_enable(&client->dev);
                pm_runtime_allow(&client->dev);

                pm_runtime_suspend(&client->dev);

                dev_warn(&client->dev, FW_BUG "Stuck I2C bus: please ignore the next 'controller timed out' error\n");
                silead_ts_get_id(client);

                /* The forbid will also resume the device */
                pm_runtime_forbid(&client->dev);
                pm_runtime_disable(&client->dev);
        }

        silead_ts_set_power(client, SILEAD_POWER_OFF);
        silead_ts_set_power(client, SILEAD_POWER_ON);

        error = silead_ts_get_id(client);
        if (error) {
                dev_err(&client->dev, "Chip ID read error %d\n", error);
                return error;
        }

        error = silead_ts_init(client);
        if (error)
                return error;

        error = silead_ts_reset(client);
        if (error)
                return error;

        error = silead_ts_load_fw(client);
        if (error)
                return error;

        error = silead_ts_startup(client);
        if (error)
                return error;

        status = silead_ts_get_status(client);
        if (status != SILEAD_STATUS_OK) {
                dev_err(&client->dev,
                        "Initialization error, status: 0x%X\n", status);
                return -ENODEV;
        }

        return 0;
}

static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
{
        struct silead_ts_data *data = id;
        struct i2c_client *client = data->client;

        silead_ts_read_data(client);

        return IRQ_HANDLED;
}

static void silead_ts_read_props(struct i2c_client *client)
{
        struct silead_ts_data *data = i2c_get_clientdata(client);
        struct device *dev = &client->dev;
        const char *str;
        int error;

        error = device_property_read_string(dev, "firmware-name", &str);
        if (!error)
                snprintf(data->fw_name, sizeof(data->fw_name),
                         "silead/%s", str);
        else
                dev_dbg(dev, "Firmware file name read error. Using default.");

        data->pen_supported = device_property_read_bool(dev, "silead,pen-supported");
        device_property_read_u32(dev, "silead,pen-resolution-x", &data->pen_x_res);
        device_property_read_u32(dev, "silead,pen-resolution-y", &data->pen_y_res);
}

#ifdef CONFIG_ACPI
static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
                                         const struct i2c_device_id *id)
{
        const struct acpi_device_id *acpi_id;
        struct device *dev = &data->client->dev;
        int i;

        if (ACPI_HANDLE(dev)) {
                acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
                if (!acpi_id)
                        return -ENODEV;

                snprintf(data->fw_name, sizeof(data->fw_name),
                         "silead/%s.fw", acpi_id->id);

                for (i = 0; i < strlen(data->fw_name); i++)
                        data->fw_name[i] = tolower(data->fw_name[i]);
        } else {
                snprintf(data->fw_name, sizeof(data->fw_name),
                         "silead/%s.fw", id->name);
        }

        return 0;
}
#else
static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
                                         const struct i2c_device_id *id)
{
        snprintf(data->fw_name, sizeof(data->fw_name),
                 "silead/%s.fw", id->name);
        return 0;
}
#endif

static void silead_disable_regulator(void *arg)
{
        struct silead_ts_data *data = arg;

        regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
}

static int silead_ts_probe(struct i2c_client *client)
{
        const struct i2c_device_id *id = i2c_client_get_device_id(client);
        struct silead_ts_data *data;
        struct device *dev = &client->dev;
        int error;

        if (!i2c_check_functionality(client->adapter,
                                     I2C_FUNC_I2C |
                                     I2C_FUNC_SMBUS_READ_I2C_BLOCK |
                                     I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
                dev_err(dev, "I2C functionality check failed\n");
                return -ENXIO;
        }

        data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
        if (!data)
                return -ENOMEM;

        i2c_set_clientdata(client, data);
        data->client = client;

        error = silead_ts_set_default_fw_name(data, id);
        if (error)
                return error;

        silead_ts_read_props(client);

        /* We must have the IRQ provided by DT or ACPI subsystem */
        if (client->irq <= 0)
                return -ENODEV;

        data->regulators[0].supply = "vddio";
        data->regulators[1].supply = "avdd";
        error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
                                        data->regulators);
        if (error)
                return error;

        /*
         * Enable regulators at probe and disable them at remove, we need
         * to keep the chip powered otherwise it forgets its firmware.
         */
        error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
                                      data->regulators);
        if (error)
                return error;

        error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
        if (error)
                return error;

        /* Power GPIO pin */
        data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
        if (IS_ERR(data->gpio_power))
                return dev_err_probe(dev, PTR_ERR(data->gpio_power),
                                     "Shutdown GPIO request failed\n");

        error = silead_ts_setup(client);
        if (error)
                return error;

        error = silead_ts_request_input_dev(data);
        if (error)
                return error;

        error = silead_ts_request_pen_input_dev(data);
        if (error)
                return error;

        error = devm_request_threaded_irq(dev, client->irq,
                                          NULL, silead_ts_threaded_irq_handler,
                                          IRQF_ONESHOT, client->name, data);
        if (error) {
                if (error != -EPROBE_DEFER)
                        dev_err(dev, "IRQ request failed %d\n", error);
                return error;
        }

        return 0;
}

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

        disable_irq(client->irq);
        silead_ts_set_power(client, SILEAD_POWER_OFF);
        return 0;
}

static int silead_ts_resume(struct device *dev)
{
        struct i2c_client *client = to_i2c_client(dev);
        bool second_try = false;
        int error, status;

        silead_ts_set_power(client, SILEAD_POWER_ON);

 retry:
        error = silead_ts_reset(client);
        if (error)
                return error;

        if (second_try) {
                error = silead_ts_load_fw(client);
                if (error)
                        return error;
        }

        error = silead_ts_startup(client);
        if (error)
                return error;

        status = silead_ts_get_status(client);
        if (status != SILEAD_STATUS_OK) {
                if (!second_try) {
                        second_try = true;
                        dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
                        goto retry;
                }
                dev_err(dev, "Resume error, status: 0x%02x\n", status);
                return -ENODEV;
        }

        enable_irq(client->irq);

        return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);

static const struct i2c_device_id silead_ts_id[] = {
        { "gsl1680" },
        { "gsl1688" },
        { "gsl3670" },
        { "gsl3675" },
        { "gsl3692" },
        { "mssl1680" },
        { }
};
MODULE_DEVICE_TABLE(i2c, silead_ts_id);

#ifdef CONFIG_ACPI
static const struct acpi_device_id silead_ts_acpi_match[] = {
        { "GSL1680", 0 },
        { "GSL1688", 0 },
        { "GSL3670", 0 },
        { "GSL3675", 0 },
        { "GSL3692", 0 },
        { "MSSL1680", 0 },
        { "MSSL0001", 0 },
        { "MSSL0002", 0 },
        { "MSSL0017", 0 },
        { }
};
MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
#endif

#ifdef CONFIG_OF
static const struct of_device_id silead_ts_of_match[] = {
        { .compatible = "silead,gsl1680" },
        { .compatible = "silead,gsl1688" },
        { .compatible = "silead,gsl3670" },
        { .compatible = "silead,gsl3675" },
        { .compatible = "silead,gsl3692" },
        { },
};
MODULE_DEVICE_TABLE(of, silead_ts_of_match);
#endif

static struct i2c_driver silead_ts_driver = {
        .probe = silead_ts_probe,
        .id_table = silead_ts_id,
        .driver = {
                .name = SILEAD_TS_NAME,
                .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
                .of_match_table = of_match_ptr(silead_ts_of_match),
                .pm = pm_sleep_ptr(&silead_ts_pm),
        },
};
module_i2c_driver(silead_ts_driver);

MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
MODULE_DESCRIPTION("Silead I2C touchscreen driver");
MODULE_LICENSE("GPL");